JP2014141995A - Flange-connecting portion reinforcement fixture - Google Patents

Abstract

Provided is a flange joint reinforcement jig that can easily and inexpensively prevent separation and displacement of both flange portions while reinforcing a pipeline including both flange portions to an earthquake resistant pipeline having predetermined earthquake resistance.
A pair of sandwiching members (5, 6) having pressing portions (5C, 6B) capable of abutting against outer surfaces (1a, 1a) of both flange portions (1A, 1B) connected to bolts, and the both sandwiching members (5). , 6 with the pressing parts 5C, 6B applied to the outer side surfaces 1a, 1a of the flange parts 1A, 1B, and the fastening means 7 for pulling and fixing the holding members 5, 6 in the flange joining direction. It is the flange joint part reinforcement jig | tool P which was equipped, Comprising: The position where both the holding members 5 and 6 mutually oppose in the flange joining direction is a radial direction outer side position rather than the outer peripheral surfaces 1c and 1c of both flange parts 1A and 1B. 5A, an inner fitting portion 5A and an outer fitting portion 6A that are fitted from the flange joining direction are formed.
[Selection] Figure 6

Description

  The present invention relates to a pair of clamping members each having a pressing portion that can be brought into contact with the outer surface of both flange portions that are bolted together, and the pressing portions of the both holding members applied to the outer surfaces of both flange portions. It is related with the flange joint part reinforcement jig provided with the fastening means which draws both the said holding members in the flange joining direction in the state where it clamped, and is fastened and fixed.

  As such a flange joint portion reinforcing jig, for example, in Patent Document 1, a pair formed in a radially outward position with respect to the outer peripheral surfaces of both flange portions at portions facing each other in the flange joint direction of both sandwiching members. The bolt screw holes (an example of fastening means) are formed, and the pressing parts formed at the radially inner side positions than the bolt screw holes in both clamping members are applied to the outer surfaces of both flange parts. A configuration in which both screw bolts (an example of fastening means) are screwed over a pair of bolt screw holes is disclosed.

  Further, as such a flange joint reinforcing jig, for example, in Patent Document 2, one of both sandwiching members is configured by a substantially U-shaped member having a pair of legs, and the other of both sandwiching members is a pair of legs. It is constituted by a bolt (an example of a fastening means) that is screwed and attached to one of the parts, and the inner peripheral surface of the other leg part to which the bolt and the bolt of the U-shaped member are not attached, The structure made into the press part which presses the outer surface of both flange parts separately is disclosed. Then, a bolt is screwed into one leg portion and further tightened, whereby the tip end of the bolt and the inner peripheral surface of the other leg portion are brought into contact with the outer side surface of the flange portion separately, and a pair of clamping members ( The flange portion is fastened and fixed by a U-shaped member and a bolt).

  By using these flange joint reinforcement jigs, a pair of clamping members are fastened and fixed by fastening means, thereby adding fastening strength by fastening means in addition to the joint strength of both flanges by a plurality of bolts and nuts. Even when a force is applied to both flange portions in the bending direction or the pulling direction, the flange portions can be prevented from separating and airtightness can be maintained.

Japanese Patent No. 4157413 Japanese Patent No. 4363565

Here, in order to further improve the seismic resistance of the pipes including both flange parts, the existing or newly installed both flange parts are equivalent to the seismic pipes (with an anti-separation force of 3DkN or more (D is the nominal diameter)). It is desired to reinforce what has a performance class A performance.
In addition, even when a force in the bending direction or the tensile direction is applied to both flange portions, it is desirable that the both flange portions be prevented from separating and the fluid flowing through the interior can be reliably prevented from leaking.
Furthermore, when one of the flange portions is a flange portion formed on one end side of a short pipe or a repair valve, the flange joint portion reinforcement is applied when the flange joint portion reinforcing jig is attached to the both flange portions. Since there is a possibility that the jig interferes with the flange portion formed on the other end side of the short pipe, the repair valve, etc., it is desirable to have a configuration that can prevent the interference as much as possible.

  Focusing on these points, in the flange joint reinforcing jig disclosed in Patent Document 1, a pair of clamping members each having a pressing portion that abuts against the outer surface of both flange portions is located radially outside the pressing portion. It is fastened and fixed by both screw bolts screwed over a pair of bolt screw holes formed on the side, and the pair of clamping members are substantially tightened only by the pair of screw screw holes and both screw bolts. It is only fixed, and when a force in the bending direction or the tensile direction acts on both flange portions, the force is applied to the pair of bolt screw holes and the screw bolts via the flange portion and the pair of clamping members. There is a possibility that both screw bolts may be extended and the screw thread at the screwed portion may be destroyed, and the two flange portions may be separated from each other. In this case, fluid may leak from between both flange portions, and it will be difficult to reinforce both flange portions to such an extent that they have the same seismic performance as the above-mentioned seismic ducts.

  Further, in the flange joint reinforcing jig disclosed in Patent Document 2, a bolt is screwed to one leg of the U-shaped member from the outer side in the tube axis direction, and the tip of the bolt is the flange portion. It is set as the structure contact | abutted on an outer surface. For this reason, a working space for screwing and mounting the bolt to one leg portion is required on the outer side portion in the tube axis direction of the U-shaped member, and one of the two flange portions is a short pipe or a repair valve. When the flange joint reinforcement jig is attached to both flange parts, the bolt of the flange joint reinforcement jig is connected to the other end of the short pipe, repair valve, etc. There is a possibility that the mounting is difficult or impossible due to interference with the flange portion formed on the side. Also, if the tip of the bolt comes into contact with the outer surface of the flange, the outer surface will be scratched and cause corrosion and the like, and if a protective member is attached to the tip of the bolt to prevent the scratch, the bolt will be damaged. If the protrusion margin that protrudes to the outer side part of the pipe-shaped direction of the letter-shaped member becomes large and a large working space is not formed in the outer side part, a flange joint reinforcement jig should be attached to both flange parts. May become even more difficult or impossible.

  The present invention has been made in view of such a situation, and its purpose is to reinforce a pipe including both flanges to an earthquake-resistant pipe having a predetermined seismic performance, and to separate and shift both flanges. An object of the present invention is to provide a flange joint reinforcing jig that can be easily and inexpensively prevented.

In order to achieve the above object, a flange joint reinforcing jig according to the present invention comprises a pair of clamping members each having a pressing portion capable of abutting against the outer surface of both flanges connected to each other by bolts. A flange joint reinforcement jig comprising a fastening means for pulling and fixing both gripping members in the flange joining direction in a state where the pressing portions of the gripping members are applied to the outer surfaces of both flanges, The feature configuration is
An inner fitting portion and an outer fitting portion that are fitted from the flange joining direction at a radially outer side position than the outer peripheral surface of the both flange portions are formed at portions facing each other in the flange joining direction of the both holding members. It is in the point.

According to the above characteristic configuration, the inner fitting portions that are fitted from the flange joining direction at positions radially outward from the outer peripheral surfaces of the two flange portions to the respective portions facing each other in the flange joining direction of the pair of holding members. Since the outer fitting part is formed, if the fastening means is tightened with the pressing parts of the pair of clamping members applied to the outer surfaces of the flange parts separately, the clamping members are pulled in the flange joining direction. As a result, the inner fitting portion is fitted into the outer fitting portion, and the inner fitting portion and the outer fitting portion are overlapped in the flange joining direction (axial direction).
As a result, even when a force in the bending direction (radial direction) acts on both flange portions in a state where the pair of clamping members are clamped and fixed by the fastening means, in addition to the fastening part of the fastening means, the inner fitting The force can be received even at the overlapping portion of the portion and the outer fitting portion, and the stress applied to the fastening portion of the fastening means can be reduced. Therefore, it is possible to improve the joint strength of both flange portions by the flange joint reinforcement jig, to prevent separation and displacement of both flange portions and fluid leakage accompanying them, and to improve the seismic performance of the pipeline. Can be planned.
Therefore, while reinforcing the pipeline including both flanges to a seismic pipeline with a predetermined seismic performance (with an anti-separation force of 3DkN or more (D is the nominal diameter)), separation and displacement of both flanges is simple and inexpensive. Can be prevented.

  A further characteristic configuration of the flange joint reinforcing jig according to the present invention is that, in a state where the inner fitting portion and the outer fitting portion of the both holding members are fitted, the pressing portion of one holding member. And a recess formed by the inner fitting portion, the pressing portion of the other holding member, and the outer fitting portion are externally fitted from the outer side in the radial direction to the adjacent portion of the bolt connecting portion in both flange portions. The outer fitting portion is configured to be a mounting restriction portion that restricts the set outer fitting mounting position by contact with the outer peripheral surfaces of both flange portions.

According to the above characteristic configuration, the concave portions formed by the both pressing portions, the inner fitting portion, and the outer fitting portion of the both clamping members are arranged in the radial direction with respect to the adjacent portions in the circumferential direction of the bolt connecting portions of both flange portions. When the outer fitting is performed from the outside, the outer fitting portion positioned radially outward from the outer circumferential surfaces of both flange portions comes into contact with the outer circumferential surface. The part reinforcing jig can be an attachment restricting part that restricts the set external fitting attachment position, and the attachment work of the flange joint reinforcing jig can be facilitated and ensured. In addition, in a state where the pair of clamping members are fastened and fixed by the fastening means, the outer surfaces of the outer fitting portions into which the inner fitting portions are fitted are in contact with the outer peripheral surfaces of the two flange portions. When a force in the bending direction (radial direction) is applied to the flange, the force can be received even at the contact point between the outer surface of the outer fitting portion and the outer peripheral surface of both flange portions. It is possible to reduce the stress applied to the overlapping portion between the portion and the outer fitting portion.
Accordingly, the flange joint reinforcing jig can be easily attached to both flange parts, and the joint strength of both flange parts by the flange joint reinforcing jig is further improved, and the separation and displacement of both flange parts and the accompanying them. Fluid leakage can be prevented more reliably, and the seismic performance of the pipe can be improved.

  A further characteristic configuration of the flange joint reinforcing jig according to the present invention is that the inner fitting portion and the outer fitting portion are configured in a fitting shape in which relative rotation is impossible.

  According to the above characteristic configuration, since the inner fitting portion and the outer fitting portion are fitted in a state in which the inner fitting portion and the outer fitting portion are not relatively rotatable around the flange joining direction, the relative rotation between the inner fitting portion and the outer fitting portion, that is, The relative rotation between the pair of clamping members can be prevented. Thus, when the flange joint reinforcing jig is attached to both flange portions, the relative position relationship between the pair of sandwiching members is determined by fitting the inner fitting portion and the outer fitting portion of both sandwiching members. Therefore, it is possible to perform the mounting operation on both flange portions even more easily.

  According to a further characteristic configuration of the flange joint reinforcing jig according to the present invention, the inner fitting portion and the outer fitting portion are each configured in a cylindrical shape, and a cylinder of the inner fitting portion and the outer fitting portion. The fastening bolt of the fastening means is inserted through the interior space.

  According to the above characteristic configuration, the inner fitting portion is fitted into the outer fitting portion configured in a cylindrical shape, and further, the fastening bolt of the fastening means is inserted into the cylindrical inner space in the inner fitting portion. The locations of the inner fitting portion and the outer fitting portion at the radially outer side positions of the outer peripheral surfaces of both flange portions can be used together with the location of the fastening bolt. Thereby, the dimension in the flange joining direction (axial direction) of the flange joint reinforcing jig and the fastening bolt attached to both flange parts, and the radially outward side (radial direction) of the flange joint reinforcing jig Any of these dimensions can be reduced, and space can be saved.

  According to a further feature of the flange joint reinforcing jig according to the present invention, one of the holding members is connected to a head of a connecting bolt that connects both flange portions or a connecting nut that is screwed to the connecting bolt. Therefore, a drop-off preventing arm that can be contacted from the radially inner side is provided.

  According to the above characteristic configuration, even when the flange portion is distorted, deformed, or relatively displaced due to its own weight or an earthquake, the drop-off prevention arm is connected to the head of the connecting bolt or the connecting nut on the radially inner side. It is possible to prevent the flange joint reinforcing jig from coming off from both flange portions.

  A further characteristic configuration of the flange joint reinforcing jig according to the present invention is a concave shape in which the drop-off prevention arm turns from the radially inner side to the radially outer side with respect to the head of the connecting bolt or the connecting nut. It is in the point formed.

  According to the above characteristic configuration, the drop-off prevention arm is formed in a concave shape that goes around from the radially inner side to the radially outer side with respect to the head of the connecting bolt or the connecting nut. Even when deformation or relative displacement occurs, the drop-off prevention arm formed in a concave shape can securely contact the head of the connection bolt or the connection nut and maintain the contact state. It can prevent more reliably that a reinforcement jig | tool falls out from both flange parts. Similarly, even when the flange joint reinforcing jig is provided at any position in the circumferential direction of both flange parts, the flange joint reinforcing jig is prevented from dropping downward from both flange parts. Can do.

  According to a further characteristic configuration of the flange joint reinforcing jig according to the present invention, the drop-off prevention arm is formed to extend from one radially inner side portion of the both clamping members, and the extending direction is When the fastening bolt is rotated to the fastening side, it is set in the same direction as the direction in which the one holding member provided with the drop-off prevention arm rotates together.

  According to the above-described characteristic configuration, the extension direction of the drop-off prevention arm formed to extend from one radially inward side portion of both clamping members is prevented from falling off when the fastening bolt is rotated to the tightening side. Since the one holding member provided with the arm is set in the same direction as the one rotating together, even if one holding member rotates together with the fastening bolt, the drop-off preventing arm is connected to the connecting bolt. Further contact with the head or the connecting nut prevents further rotation. Moreover, since one clamping member is supported by the outer surface of a press part and a flange part, a fall-off prevention arm, and the head of a connection bolt, or a connection nut, the fastening operation | work of a fastening bolt can be performed stably. .

  A further characteristic configuration of the flange joint reinforcing jig according to the present invention is such that the side surface of the drop-off prevention arm facing the outer side surface of the flange portion is a pressing portion in one holding member provided with the drop-off prevention arm. It exists in the point arrange | positioned rather than the outer surface of the said flange part rather than the pressing surface.

  According to the above characteristic configuration, the side surface facing the outer surface of the flange portion of the drop-off prevention arm is separated from the outer surface of the flange portion rather than the pressing surface of the pressing portion in the one holding member provided with the drop-off prevention arm. Therefore, even when the fastening means is tightened and the pressing surface of the pressing portion is pressed against the outer surface of the flange portion, the falling prevention arm does not contact the outer surface of the flange portion, A direct load is not applied, and breakage prevention arms can be prevented from being damaged.

  According to a further feature of the flange joint reinforcing jig according to the present invention, the fastening means is configured so that the cylindrical inner space between the inner fitting portion and the outer fitting portion is outside the outer fitting portion. The fastening bolt is inserted and a female screw portion into which the fastening bolt formed on the inner peripheral surface of the inner fitting portion is screwed.

  According to the above characteristic configuration, the fastening means includes the fastening bolt inserted from the outside of the outer fitting portion into the cylindrical inner space of the inner fitting portion and the outer fitting portion, and the inner periphery of the inner fitting portion. Since the fastening bolt formed on the surface is screwed into the female screw portion, the female screw portion can be positioned at the overlapping portion of the inner fitting portion and the outer fitting portion in the cylindrical inner space. It is possible to relatively shorten the length of the fastening bolt. Thereby, even when the thickness of each flange portion is changed according to the nominal diameter or design pressure of the flange portion, it is possible to satisfactorily prevent the tip of the fastening bolt from protruding outside the cylindrical internal space, Space saving can be achieved without impairing the appearance of the flange joint reinforcing jig.

  According to a further feature of the flange joint reinforcing jig according to the present invention, the fastening means is inserted in a cylindrical inner space between the inner fitting portion and the outer fitting portion from one outer side in a penetrating state. The fastening bolt and the fastening nut that is screwed into the protruding male screw portion of the fastening bolt from the other outer side.

  According to the above characteristic configuration, the fastening means is inserted into the cylindrical inner space of the inner fitting portion and the outer fitting portion in a penetrating state from one outer side, and the protruding male screw of the fastening bolt Since it is composed of a fastening nut that is screwed to the outer part from the other outer side, it is only necessary to form the inner fitting part and the outer fitting part in a cylindrical shape, and it is not necessary to form a thread. The reinforcing jig can be made simple and inexpensive.

  A further characteristic configuration of the flange joint reinforcing jig according to the present invention is that the female screw portion is formed at one end portion on the outer fitting portion side of the inner peripheral surface of the inner fitting portion.

  According to the above characteristic configuration, since the female screw portion is formed at one end portion on the outer fitting portion side of the inner peripheral surface of the inner fitting portion, the female screw portion is fitted to the inner fitting portion and the outer fitting portion. It will be located in the position close | similar to the head of the fastening bolt inserted by the cylindrical internal space with a part. As a result, the screwed portion of the female screw portion and the male screw portion of the fastening bolt comes close to the position where the head of the fastening bolt comes into contact with the outer fitting portion, and the fastening bolt in the flange joining direction (axial direction) The distance between the head and the screwed portion can be made relatively small, and even when a force in the bending direction (radial direction) or tensile direction (axial direction) acts on both flange portions, Breakage can be prevented well. That is, since it is possible to prevent the fastening bolts from being stretched, it is possible to satisfactorily prevent the flanges from being separated or displaced and the fluid leakage associated therewith. Further, if the distance can be made relatively small, a general-purpose bolt can be used as the fastening bolt, and the flange joint reinforcing jig can be made inexpensive.

Exploded perspective view of both flanges Side view of both flanges Vertical section of both flanges The figure which shows schematic structure of a 1st clamping member The figure which shows schematic structure of a 2nd clamping member The perspective view which shows the mounting state of the 1st and 2nd clamping member. The figure which shows schematic structure of a 1st and 2nd clamping member The side view which shows the mounting state of the 1st and 2nd clamping member A longitudinal sectional view showing the mounting state of the first and second clamping members A longitudinal sectional view showing the mounting state of the first and second clamping members The side view which shows the mounting state of the 1st and 2nd clamping member which concerns on another embodiment The longitudinal cross-sectional view which shows the mounting state of the 1st and 2nd clamping member which concerns on another embodiment The longitudinal cross-sectional view which shows the mounting state of the 1st and 2nd clamping member which concerns on another embodiment

Hereinafter, based on FIGS. 1-10, embodiment of the flange junction part reinforcement jig | tool P is described.
1 to 3 show a flange joint part in the middle of a fluid piping system (pipe), and are formed in a disk shape radially outward at the ends of both water pipes 1 and 1 made of cast iron, which is an example of a fluid pipe. The flange portions 1A and 1B formed to extend to each other have a ring-like sheet-like gasket 2 interposed between the flange portions 1A and 1B, and a plurality of connection bolts 4A and connection nuts 4B (this embodiment) In the form, they are connected by 8). A plurality of through-holes 3 (8 in this embodiment) that penetrate in the flange joining direction (axial direction) are formed in both flange portions 1A and 1B at equal intervals in the circumferential direction, and are connected to these through-holes 3 The bolt 4A is inserted, and the connecting nut 4B is screwed and fixed to the distal end side of the male screw portion 4b of the connecting bolt 4A. In addition, both flange parts 1A and 1B of this embodiment are what is called RF type flanges.

  Here, in the following, in both flange portions 1A and 1B, the surfaces on which the water pipe 1 protrudes are referred to as outer surfaces 1a and 1a, and both flange portions 1A and 1B are connected by a connecting bolt 4A and a connecting nut 4B. The surfaces facing each other in the flange joining direction (axial direction) will be referred to as joining surfaces 1b and 1b, and the radially outward surfaces of the flange portions 1A and 1B will be described as outer peripheral surfaces 1c and 1c.

  As shown in FIGS. 4 to 9, the flange joint reinforcing jig P according to the present application can abut on the outer surface 1a of the flange portion 1A at both flange portions 1A and 1B which are bolt-connected as described above. A first holding member 5 having a pressing portion 5C and a second holding member 6 having a pressing portion 6B capable of coming into contact with the outer surface 1a of the flange portion 1B, and the pressing portion 5C and first of the first holding member 5 2 With the pressing portion 6B of the sandwiching member 6 applied to the outer surfaces 1a and 1a of the flange portions 1A and 1B, the first sandwiching member 5 and the second sandwiching member 6 are in the flange joining direction (axial direction). And fastening means 7 for drawing and fastening.

  As shown in FIGS. 4 and 6 to 9, the first clamping member 5 is made of a metal material, and has a substantially bottomed rectangular tube whose outer surface 5 a is a substantially quadrangular shape and whose inner peripheral surface 5 b is a circular shape in a cross-sectional view. The inner fitting portion 5A formed in a shape (an example of a cylindrical shape) and a flange extending outward from the outer surface 5a of the inner fitting portion 5A over the entire circumference at one end of the inner fitting portion 5A 5B and the pressing part 5C extending further outward from one side of the four sides of the bowl-shaped part 5B are integrally provided.

  The inner fitting portion 5A is formed in a substantially square shape in a side view (see FIG. 4), and a cylinder that can insert a male screw portion 7a of a fastening bolt 7A of a fastening means 7 described later into the inner fitting portion 5A. A cylindrical inner space 5c is formed. The inner diameter of the cylindrical inner space 5c is slightly larger than the outer diameter of the male screw portion 7a of the fastening bolt 7A.

  The bowl-shaped portion 5B is formed in a substantially square shape in a side view, and the cylindrical internal space 5c is formed through the central portion in a cross-sectional view (see FIG. 4).

  In the cylindrical internal space 5c, the side on which the flange 5B and the pressing part 5C are formed is formed with an opening, and the side opposite to the side on which the flange 5B and the pressing part 5C are formed is the male screw of the fastening bolt 7A. A female screw portion 5d to which the portion 7a can be screwed is formed so as to penetrate the bottom of the inner fitting portion 5A. That is, the female screw portion 5d is formed at an end portion on the opposite side to the side on which the flange portion 5B and the pressing portion 5C are formed on the inner peripheral surface 5b of the cylindrical inner space 5c in the inner fitting portion 5A. Yes.

  The pressing portion 5C is formed in a slightly tapered shape in a side view (see FIG. 4A), and is formed in a tapered shape that is inclined toward the female screw portion 5d as it goes to the distal end side in a longitudinal sectional view. The front end portion of the surface on the female screw portion 5d side of 5C is formed as a pressing surface 5e perpendicular to the outer surface 5a of the inner fitting portion 5A.

  As shown in FIGS. 5 to 9, the second clamping member 6 is made of a metal member, and has a substantially bottomed rectangular tube shape (an example of a tube shape) in which the outer surface 6 a and the inner surface 6 b are approximately quadrilateral in a cross-sectional view. The formed outer fitting portion 6A, a pressing portion 6B extending outward from one of the four sides of the outer surface 6a of the outer fitting portion 6A at one end of the outer fitting portion 6A, and a pressing portion 6B And a drop-off preventing arm 6 </ b> C extending from the tip of the body.

6A of outer fitting parts are formed in a substantially square shape by side view (refer FIG. 5), and the cylindrical internal space which can insert the inner fitting part 5A of the 1st clamping member 5 in 6 A of outer fitting parts 6c is formed. The cylindrical internal space 6c is formed in a substantially square shape in a cross-sectional view, and is formed slightly larger than the inner fitting portion 5A having a substantially square shape in a cross-sectional view. For this reason, the fitting shape between the outer surface 5a of the inner fitting portion 5A and the inner surface 6b of the outer fitting portion 6A is such that the inner fitting portion 5A is inserted (fitted) into the cylindrical inner space 6c of the outer fitting portion 6A. Then, it is slidable in the insertion direction (longitudinal direction of the cylindrical internal space 6c), but cannot be relatively rotated around the insertion direction (around the axis along the longitudinal direction of the cylindrical internal space 6c). It is formed as follows.
Further, in the cylindrical internal space 6c, an opening is formed on the side opposite to the side where the pressing portion 6B is formed, and the side where the pressing portion 6B is formed can insert the male screw portion 7a of the fastening bolt 7A and the head. An insertion hole 6d that cannot be inserted through the portion 7b is formed so as to penetrate the bottom of the outer fitting portion 6A. In a state where the male screw portion 7a of the fastening bolt 7A is inserted through the insertion hole 6d, a predetermined gap is formed between the outer peripheral surface of the male screw portion 7a and the inner peripheral surface of the insertion hole 6d ( (See FIG. 9).

  Similar to the pressing portion 5C of the first clamping member 5, the pressing portion 6B is formed in a slightly tapered shape in a side view (see FIG. 5A), and the pressing portion as it goes to the tip side in a longitudinal sectional view. 6B is formed in a tapered shape that is inclined to the opposite side to the side on which 6B is formed, and the tip portion of the surface of the pressing portion 6B opposite to the insertion hole 6d is perpendicular to the outer surface 6a of the outer fitting portion 6A. It is formed as a surface 6e.

  The drop-off prevention arm 6C is a substantially U-shaped member that is formed to extend in a concave shape from the distal end portion of the pressing portion 6B that is formed in a tapered shape in a side view (see FIGS. 5A and 5C). The outer diameter of the head 4a is slightly larger than that of the head 4a so that at least a part of the head 4a of the connecting bolt 4A can be enclosed. Further, of the surfaces constituting the drop-off prevention arm 6C in a longitudinal sectional view, the surface opposite to the insertion hole 6d in the longitudinal direction of the cylindrical internal space 6c is formed to be retracted to the insertion hole 6d side from the pressing surface 6e. Has been.

  As shown in FIGS. 6 to 9, the fastening means 7 includes the above-described fastening bolt 7A inserted into the cylindrical inner space 6c from the outside of the outer fitting portion 6A via the insertion hole 6d, and the inner fitting portion. It is comprised from 5 d of internal thread parts formed in the internal peripheral surface 5b of 5A.

  Next, an operation process for mounting the flange joint reinforcing jig P on both flange portions 1A and 1B connected by a plurality of connecting bolts 4A and connecting nuts 4B will be described.

As shown in FIG. 6, the inner fitting portion 5A of the first holding member 5 and the outer fitting portion 6A of the second holding member 6 which are formed at the portions facing each other in the flange joining direction are replaced with the inner fitting portion 5A. Than the outer peripheral surfaces 1c and 1c of both flange portions 1A and 1B so that the inner fitting portion 5A is fitted into the cylindrical inner space 6c of the outer fitting portion 6A from the bottom side (the female screw portion 5d side). It is fitted from the flange joining direction at a position on the radially outer side.
At this time, since the outer surface 5a of the inner fitting portion 5A and the inner surface 6b of the outer fitting portion 6A are formed in a substantially square shape that is not relatively rotatable in a cross-sectional view, the pressing portion of the first clamping member 5 5C and the pressing part 6B of the 2nd clamping member 6 can be easily fitted in the state positioned in the intended relative positional relationship extended in the same direction. That is, the inner fitting portion 5A is externally fitted so that the pressing surface 5e of the pressing portion 5C of the first clamping member 5 and the pressing surface 6e of the pressing portion 6B of the second clamping member 6 face each other in the flange joining direction. It is fitted to the part 6A.

As shown in FIG. 7, in a state where the inner fitting portion 5A and the outer fitting portion 6A are fitted, the pressing portion 5C of the first clamping member 5 and the outer surface 5a of the inner fitting portion 5A in a longitudinal sectional view. And a pressing portion 6B of the second clamping member 6 and an outer surface 6a of the outer fitting portion 6A form a substantially U-shaped concave portion C, and the concave portion C is connected to a bolt connecting portion in the circumferential direction of both flange portions 1A and 1B. It is comprised so that external fitting mounting | wearing is possible from the radial direction outer side with respect to the site | part between adjacent. Therefore, the fitting between the inner fitting portion 5A and the outer fitting portion 6A described above is performed once in the flange joining direction by pressing the pressing surface 5e of the pressing portion 5C of the first holding member 5 and the pressing portion of the second holding member 6. The distance between the pressing surface 6e of 6B and the pressing surface 6e is larger than the distance between the outer surface 1a of the flange portion 1A and the outer surface 1a of the flange portion 1B.
The above-mentioned fitting between the inner fitting portion 5A and the outer fitting portion 6A is performed by setting the size (fitting distance) of the overlapping portion between the inner fitting portion 5A and the outer fitting portion 6A in the flange joining direction. It is configured to be arbitrarily adjustable within the range, and with this adjustment, the interval between the pressing surface 5e of the pressing portion 5C of the first clamping member 5 and the pressing surface 6e of the pressing portion 6B of the second clamping member 6 is within a predetermined range. It is configured to be arbitrarily adjustable within. Therefore, in a state where the size of the overlapping portion (fitting distance) between the inner fitting portion 5A and the outer fitting portion 6A in the flange joining direction and the interval between the pressing surface 5e and the pressing surface 6e are appropriately set, The first clamping member 5 and the second clamping member 6 can be fastened and fixed by fastening means 7 described later.

  When the concave portion C is externally fitted to adjacent portions of the bolt connecting portions of the flange portions 1A and 1B, the outer surface 6a (the concave portion C) of the outer fitting portion 6A on the side where the pressing portion 6B extends. 1 part) is brought into contact with at least one of the outer peripheral surfaces 1c and 1c of both flange portions 1A and 1B, so that the first clamping member 5 and the second clamping member 6 are mounted at the desired setting external fitting mounting position. (See FIGS. 7 and 9). That is, the outer surface 6a of the outer fitting portion 6A on the side where the pressing portion 6B extends is an attachment restriction portion that restricts the set outer fitting position by contact with the outer peripheral surfaces 1c and 1c of both flange portions 1A and 1B. Will function.

  Subsequently, after the concave portion C is mounted at the set external fitting mounting position, the outer surface 6a of the outer fitting portion 6A on the side where the pressing portion 6B extends is set to at least one of the outer peripheral surfaces 1c and 1c of both flange portions 1A and 1B. In the state of contact, the pressing surface 5e of the pressing portion 5C of the first clamping member 5 contacts the outer surface 1a of the flange portion 1A, and the pressing surface 6e of the pressing portion 6B of the second clamping member 6 corresponds to the flange portion 1B. The inner fitting portion 5A and the outer fitting portion 6A are pulled in the flange joining direction until the inner fitting portion 5A is brought into contact with the outer side surface 1a, thereby fitting the inner fitting portion 5A into the cylindrical inner space 6c of the outer fitting portion 6A (FIG. 7). And FIG. 9).

  At this time, the second clamping member 6 is formed in a concave shape that turns from the radially inner side of the flange portion 1B to the radially outer side with respect to the head 4a of the connecting bolt 4A adjacent to the second clamping member 6. The drop-off prevention arm 6C is brought into contact with or close to the head 4a of the connecting bolt 4A from the radially inner side (see FIGS. 6 and 8). The extension direction of the drop-off prevention arm 6C is set in the same direction as the direction in which the second gripping member 6 provided with the drop-off prevention arm 6C rotates when the fastening bolt 7A is rotated to the tightening side. ing. That is, the drop-off prevention arm 6C is tightened with the fastening bolt 7A centering on the insertion hole 6d formed in the center portion of the outer fitting portion 6A from the distal end portion of the pressing portion 6B of the second clamping member 6 in a side view. Toward the attachment direction (in this embodiment, the fastening bolt 7A is a right-hand thread, and therefore, it is pressed against the clockwise direction around the insertion hole 6d, that is, the direction in which the pressing portion 6B extends from the insertion hole 6d. It is formed so as to extend (toward the right side of the portion 6B).

  Next, the male screw portion 7a of the fastening bolt 7A is inserted into the cylindrical inner space 6c from the outside of the outer fitting portion 6A in the flange joining direction through the insertion hole 6d, and the head portion 7b of the fastening bolt 7A is inserted. Until it abuts on the outer side surface (not shown) of the outer fitting portion 6A, it is screwed into the female screw portion 5d of the inner fitting portion 5A fitted in the cylindrical inner space 6c to be fastened and fixed. Even when the second clamping member 6 rotates together in the tightening direction when the fastening bolt 7A is tightened and fixed, the drop-off preventing arm 6C is pressed against the head 4a of the adjacent connecting bolt 4A from the radially inner side. It will be in contact, and further co-rotation will be prevented. Moreover, since the 2nd clamping member 6 is supported by the outer surface 1a of the press part 6B and the flange part 1B, the drop-off prevention arm 6C, and the head 4a of the connecting bolt 4A, the tightening operation of the fastening bolt 7A can be stably performed. It can be carried out.

  In addition, the side surface facing the outer side surface 1a of the flange portion 1B of the drop-off prevention arm 6C is located on the outer side of the flange portion 1B more than the press surface 6e of the press portion 6B in the second gripping member 6 provided with the drop-off prevention arm 6C. Since it is disposed on the side away from the side surface 1a, even when the fastening bolt 7A is tightened and the pressing surface 6e of the pressing portion 6B is pressed against the outer surface 1a of the flange portion 1B, the drop-off preventing arm 6C is outside the flange portion 1B. Without coming into contact with the side surface 1a, no load is directly applied to the drop-off prevention arm 6C, and the fall-off prevention arm 6C can be prevented from being damaged.

Therefore, the first clamping member 5 and the second clamping member 6 are pulled in the flange joining direction with the both pressing portions 5C and 6B being applied to the outer surfaces 1a and 1a of the flange portions 1A and 1B, respectively, and are internally fitted. The portion 5A is fitted in the outer fitting portion 6A, and the inner fitting portion 5A and the outer fitting portion 6A can be tightened and fixed in a state where they overlap in the flange joining direction (axial direction). In the clamped and fixed state, the outer surface 6a of the outer fitting portion 6A on the side where the pressing portion 6B extends is in a state of being in contact with at least one of the outer peripheral surfaces 1c and 1c of both flange portions 1A and 1B.
Further, in the tightened and fixed state, the female screw portion 5d of the inner fitting portion 5A is located at a position close to the head portion 7b of the fastening bolt 7A, so the female screw portion 5d and the male screw portion of the fastening bolt 7A. 7a is close to the position where the head 7b of the fastening bolt 7A contacts the outer surface of the outer fitting portion 6A, and the head 7b of the fastening bolt 7A in the flange joining direction (axial direction) The distance from the screwing location can be made relatively small. Thereby, even when a force in the bending direction (radial direction) or the tensile direction (axial direction) acts on both flange portions 1A and 1B, it is possible to prevent the fastening bolt 7A from being stretched and broken well, and both flange portions. It is possible to satisfactorily prevent separation and displacement of 1A and 1B and fluid leakage associated therewith. Further, the female screw portion 5d can be positioned at the overlapping portion of the inner fitting portion 5A and the outer fitting portion 6A in the cylindrical inner spaces 5c, 6c, and the length of the fastening bolt 7A is made relatively short. It is possible to satisfactorily prevent the tip of the fastening bolt 7A from protruding outside the cylindrical inner spaces 5c, 6c, and to save space without impairing the appearance of the flange joint reinforcing jig P. be able to.

  Next, after mounting the flange joint reinforcement jig P, another flange joint reinforcement jig P is radially attached to the adjacent portions of all other bolt connection locations in the flange portions 1A and 1B. Fit sequentially from the outside. In addition, it is good also as performing the said external fitting mounting | wearing only with respect to a part of site | part between adjacent bolt connection locations as needed.

  Thus, even when a force in the bending direction (radial direction) acts on both flange portions 1A and 1B in a state where the first clamping member 5 and the second clamping member 6 are clamped and fixed by the fastening means 7, the fastening is performed. In addition to the fastening part of the means 7, the force can be received even at the overlapping part of the inner fitting part 5A and the outer fitting part 6A, and the stress applied to the fastening part of the fastening means 7 can be reduced. In the state where the first clamping member 5 and the second clamping member 6 are fastened and fixed by the fastening means 7, the outer surface of the outer fitting portion 6A into which the inner fitting portion 5A is fitted is the two flange portions 1A, 1B. When the force in the bending direction (radial direction) acts on both flange portions 1A and 1B, the outer surface 6a and both flanges of the outer fitting portion 6A are in contact with at least one of the outer peripheral surfaces 1c and 1c. The force can be received even at locations where the portions 1A and 1B are in contact with the outer peripheral surfaces 1c and 1c, and the stress applied to the overlapping portion of the fastening means 7, the inner fitting portion 5A and the outer fitting portion 6A is reduced. be able to. Further, in a state where the male screw portion 7a of the fastening bolt 7A is inserted into the insertion hole 6d, a predetermined gap is formed between the outer peripheral surface of the male screw portion 7a and the inner peripheral surface of the insertion hole 6d. Even if a force in the bending direction (radial direction) acts on the flange portions 1A and 1B and the fastening bolt 7A is slightly displaced in the radial direction, if the displacement is about the predetermined gap, the fastening bolt 7A The male screw portion 7a does not come into contact with the insertion hole 6d, and the fastening bolt 7A can be prevented from being stretched or broken.

Accordingly, the flange joint reinforcing jig P can be easily attached to both the flange parts 1A and 1B, and the joint strength of the both flange parts 1A and 1B by the flange joint reinforcing jig P can be further improved to It is possible to more reliably prevent the separation and displacement of 1A and 1B and the leakage of clean water (an example of a fluid) associated therewith, and to improve the seismic performance of the pipe.
Therefore, the flanges 1A and 1B are separated from each other while reinforcing the pipe including the flanges 1A and 1B to an earthquake resistant pipe having a predetermined seismic performance (detachment prevention force is 3DkN or more (D is a nominal diameter)). Misalignment can be easily and inexpensively prevented.

  Further, the flange joint reinforcing jig P has an inner fitting portion 5A fitted into a cylindrical outer fitting portion 6A, and is further fastened to a cylindrical inner space 5c in the inner fitting portion 5A. Since the fastening bolt 7A of the means 7 is inserted, the locations of the inner fitting portion 5A and the outer fitting portion 6A at the radially outer side positions of the outer peripheral surfaces 1c, 1c of both flange portions 1A, 1B, It can also serve as a place where the fastening bolt 7A is disposed. Thereby, the dimension in the flange joining direction (axial direction) of the flange joint reinforcement jig P and the fastening bolt 7A attached to both flange parts 1A, 1B, and the radial outside of the flange joint reinforcement jig P Any of the dimensions on the side (radial direction) can be reduced, and space can be saved.

  Further, even when the flanges 1A, 1B are distorted, deformed, or relatively displaced due to their own weight or an earthquake, the drop-off preventing arm 6C formed in the concave shape is surely attached to the head 4a of the connecting bolt 4A. Can be maintained in contact with each other, and the flange joint reinforcing jig P can be more reliably prevented from falling off from both flange portions 1A, 1B. Similarly, even when the flange joint reinforcing jig P is provided at any location in the circumferential direction of both flange parts 1A, 1B, the flange joint reinforcing jig P falls off from both flange parts downward. This can be prevented.

Here, as described above, the flange joint reinforcing jig P is overlapped in the flange joining direction (axial direction) between the inner fitting portion 5A of the first holding member 5 and the outer fitting portion 6A of the second holding member 6. By arbitrarily adjusting the size (fitting distance) of the part within a predetermined range, the pressing surface 5e of the pressing part 5C of the first clamping member 5 and the pressing surface 6e of the pressing part 6B of the second clamping member 6 The interval can be arbitrarily adjusted within a predetermined range.
For this reason, when the thickness of both flange parts 1A and 1B is changed according to the nominal diameter and design pressure of both flange parts 1A and 1B, for example, as shown in FIG. Even when the flange joint reinforcing jig P is attached to both flange portions 10A and 10B having a thickness smaller than the thickness, the size of the overlapping portion between the inner fitting portion 5A and the outer fitting portion 6A ( By adjusting the fitting distance) (in FIG. 10, the fitting distance is greatly adjusted), the pressing surface 5e of the pressing portion 5C of the first clamping member 5 is brought into contact with the outer surface 10a of the flange portion 10A and the second With the pressing surface 6e of the pressing portion 6B of the clamping member 6 in contact with the outer surface 10a of the flange portion 10B, the male screw portion 7a of the fastening bolt 7A is screwed into the female screw portion 5d of the inner fitting portion 5A. The inner fitting portion 5A and the outer fitting portion 6A, and thus the first clamping member 5 Beauty second clamping member 6 both flanges 10A, it can be satisfactorily fastened to 10B.

  Thus, even when the thickness of each flange part 1A, 1B is changed according to the nominal diameter or design pressure of the flange parts 1A, 1B, the fastening means 7 is provided with the inner fitting part 5A and the outer fitting part 6A. Fastening bolts 7A inserted into the cylindrical inner spaces 5c, 6c from the outside of the outer fitting portion 6A through the insertion holes 6d, and fastening bolts 7A formed on the inner peripheral surface 5b of the inner fitting portion 5A And the female screw portion 5d on the outer fitting portion 6A side of the overlapping portion of the inner fitting portion 5A and the outer fitting portion 6A in the cylindrical inner spaces 5c, 6c. Since it is located at one end, the screwed portion of the female screw portion 5d and the male screw portion 7a of the fastening bolt 7A is close to the position where the head 7b of the fastening bolt 7A contacts the outer fitting portion 6A. The head 7b of the fastening bolt 7A and the screwed portion in the flange joining direction (axial direction) Can be made relatively small, and even when a force in the bending direction (radial direction) or tensile direction (axial direction) acts on both flange portions 1A, 1B, the fastening bolt 7A can be stretched and broken well. Can be prevented. If the distance can be made relatively small, a general-purpose bolt can be used as the fastening bolt 7A, and the flange joint reinforcing jig P can be made inexpensive.

[Another embodiment]
(A) In the above embodiment, the two flange portions 1A and 1B are connected by eight pairs of connecting bolts 4A and connecting nuts 4B. However, depending on the nominal diameter of the flange portions 1A and 1B, the design pressure, etc. The number of bolts 4A and connecting nuts 4B can be adjusted as appropriate. For example, as shown in FIG. 11, the flange joint reinforcing jig P is attached to a portion adjacent to the bolt connecting portion as a configuration in which both flange portions 11A and 11B are connected by four pairs of connecting bolts 4A and connecting nuts 4B. It can also be configured.

(B) In the above embodiment, when the flange joint reinforcing jig P is attached to both flange portions 1A and 1B, the inner fitting portion 5A of the first clamping member 5 and the outer fitting portion 6A of the second clamping member 6 are used. And a recess C formed by the inner fitting portion 5A, the pressing portion 5C, the outer fitting portion 6A, and the pressing portion 6B is externally fitted to both flange portions 1A and 1B. However, the mounting procedure of the flange joint reinforcing jig P can be changed as appropriate.
For example, the pressing portion 6B of the second clamping member 6 is brought into contact with the outer surface 1a of the flange portion 1B, and the drop-off preventing arm 6C is brought into contact with the head portion 4a of the connecting bolt 4A from the radially inner side of the flange portion 1B. In the state where the outer fitting portion 6A is positioned closer to the outer side in the radial direction of the outer peripheral surface 1c of the flange portion 1B, the outer fitting portion 5A of the first clamping member 5 is fitted from the flange joining direction. The pressing portion 5C is brought into contact with the outer surface 1a of the flange portion 1A while being fitted in the joint portion 6A. Thereafter, the male screw portion 7a of the fastening bolt 7A is screwed into the female screw portion 5d of the inner fitting portion 5A via the insertion hole 6d of the outer fitting portion 6A, and the first holding member 5 and the second holding member 6 are moved. It can also be externally fitted to both connecting flange portions 1A, 1B.
Further, for example, as in the above embodiment, when the flange joint reinforcing jig P is attached to both flange portions 1A and 1B, the external fitting between the inner fitting portion 5A of the first clamping member 5 and the second clamping member 6 is performed. When the mating portion 6A is fitted to some extent, the male screw portion 7a of the fastening bolt 7A is screwed to some extent with the female screw portion 5d of the inner fitting portion 5A through the insertion hole 6d of the outer fitting portion 6A. Therefore, the recess C of the first clamping member 5 and the second clamping member 6 may be externally fitted to both the connecting flange portions 1A and 1B, and then the fastening bolt 7A may be finally tightened.

(C) In the above embodiment, the drop-off prevention arm 6C is provided only on the second clamping member 6. However, if necessary, the fall-off preventing arm 6C is provided on both or one of the first clamping member 5 and the second clamping member. In this case, the drop-off preventing arm 6C can be brought into contact with or close to the head 4a of the connecting bolt 4A or the connecting nut 4B from the radially inner side of both flanges 1A, 1B. .
Further, the drop-off prevention arm 6C is simply not formed into a concave shape that turns from the radially inner side of the flanges 1A and 1B to the radially outer side with respect to the head 4a or the connecting nut 4B of the connecting bolt 4A. Also, it can be configured by a rod-shaped member that comes into contact with the head 4a of the connecting bolt 4A or the connecting nut 4B from the radially inner side of both flanges 1A, 1B.
Note that the drop-off preventing arm 6C may be omitted.

(D) In the above embodiment, the first holding member 5 is provided with the inner fitting portion 5A, and the second holding member 6 is provided with the outer fitting portion 6A. It is good also as a structure which provides a part and provides an internal fitting part in the 2nd clamping member 6. FIG.

(E) In the above embodiment, the fitting shape between the inner fitting portion 5A of the first clamping member 5 and the outer fitting portion 6A of the second clamping member 6, that is, the inner fitting portion 5A in a cross-sectional view. Although the shape of the outer surface 5a and the inner surface 6b of the outer fitting portion 6A is a substantially square shape, relative rotation around the flange joining direction is performed with the inner fitting portion 5A and the outer fitting portion 6A being fitted. Other fitting shapes can also be employed as long as they are not possible. For example, the shape of the outer surface 5a of the inner fitting portion 5A and the inner surface 6b of the outer fitting portion 6A can be configured in an elliptical shape, a polygonal shape, or the like in a cross-sectional view.

(F) In the above embodiment, the inner fitting portion 5A of the first clamping member 5 is formed in a bottomed cylindrical shape, the cylindrical inner space 5c is formed inside, and the female screw portion is formed at the bottom of the inner fitting portion 5A. 5d is formed as an opening, and the outer fitting portion 6A of the second clamping member 6 is formed in a bottomed cylindrical shape to form a cylindrical inner space 6c. An insertion hole 6d is formed in the bottom of the outer fitting portion 6A. By forming the fastening means 7, the fastening bolt 7A inserted through the insertion hole 6d and screwed into the female screw portion 5d and the female screw portion 5d are used. The structure of the clamping member 6 and the fastening means 7 can be changed suitably.

  For example, as shown in FIG. 12, the inner fitting portion 50A of the first clamping member 50 is configured in a substantially rectangular bar shape having an outer diameter that can be fitted into the outer fitting portion 51A of the second clamping member 51. 2 The outer fitting part 51A of the clamping member 51 is formed in a cylindrical shape. In addition, the 1st clamping member 50 is provided with the hook-shaped part 5B and the press part 5C in the said embodiment, and the 2nd clamping member 51 is provided with the press part 6B in the said embodiment. A bolt 52 having a male threaded portion 52a is formed on the distal end side of the inner fitting portion 50A so as to protrude in the flange joining direction (longitudinal direction of the inner fitting portion 50A), and is fitted inside the outer fitting portion 51A. With the joint portion 50A fitted in a relatively non-rotatable manner, the front end of the male screw portion 52a protrudes to the outside of the outer fitting portion 51A, and the fastening nut 53 extends from the outside of the outer fitting portion 51A to the outer surface side. The first clamping member 50 and the second clamping member 51 may be fastened and fixed until they come into contact with each other.

Further, for example, as shown in FIG. 13, the inner fitting portion 60A of the first clamping member 60 is formed in a cylindrical shape, and the inner fitting portion 60A is outside the second clamping member 61 in a state in which the inner fitting portion 60A is not relatively rotatable. The fitting portion 61 </ b> A has an outer diameter that can be fitted into the fitting portion 61 </ b> A, and an inner diameter that can form a cylindrical inner space 63 into which a male screw portion (not shown) of the fastening bolt 62 can be inserted. That is, an internal thread portion is not formed in the inner fitting portion 60A. In addition, the 1st clamping member 60 is provided with the collar-shaped part 5B and the press part 5C in the said embodiment, and the 2nd clamping member 61 is provided with the press part 6B (insertion hole 6d) in the said embodiment. Then, the fastening means 7 includes a fastening bolt 62 that is inserted through the cylindrical inner spaces 63 and 6c of the inner fitting portion 60A and the outer fitting portion 61A from one outer side, and a protrusion of the fastening bolt 62. A fastening nut 64 that is screwed into the male screw portion 62a from the other outer side is provided. Then, in a state where the inner fitting portion 60A is fitted in the outer fitting portion 61A, the protruding male screw portion 62a protrudes to the outside of the outer fitting portion 61A, and the fastening nut 64 is fitted on the protruding male screw portion 62a. The first clamping member 60 and the second clamping member 61 may be tightened and fixed by being screwed until they come into contact with the outer surface side from the outside of the joining portion 61A.
Accordingly, the inner fitting portion 60A and the outer fitting portion 61A are simply formed in a cylindrical shape, and it is not necessary to form a thread on both of them, so that the flange joint reinforcing jig P is configured to be simple and inexpensive. be able to.

(G) In the above-described embodiment, the inner fitting portion 5A of the first clamping member 5 is formed in a bottomed cylindrical shape, and the cylindrical inner space 5c is formed therein. In the cylindrical inner space 5c, the bowl-shaped portion Although the side where the 5B and the pressing portion 5C are formed is formed as an opening, the portion where the opening is formed may be closed with a plug member made of rubber or the like. Thereby, it is possible to satisfactorily prevent dust and the like from entering the cylindrical internal space 5c and to improve the appearance.

(H) In the above embodiment, the configuration in which both flange portions 1A and 1B are so-called RF-type flanges has been described, but other flange joints may be used as long as they are flange joints, for example, so-called GF-type flanges. It is good.

(I) In the above embodiment, the flange joint reinforcing jig P is connected to the flange portions 1A and 1B formed on the cast iron water pipes 1 and 1 which are examples of fluid pipes constituting the fluid piping system (pipe). However, the fluid pipe may be a pipe through which gas or liquid flows.

  As described above, a flange joint reinforcement jig that can easily and inexpensively prevent separation and displacement of both flange portions while reinforcing a pipeline including both flange portions to an earthquake resistant pipeline having predetermined earthquake resistance performance. Can be provided.

1 Water pipe (fluid pipe)
1A Flange portion 1B Flange portion 1a Outer side surface 1c Outer peripheral surface 4A Connection bolt 4a Head 4B Connection nut 5 First clamping member (clamping member)
5A Inner fitting part 5C Press part 5a Outer surface 5b Inner peripheral surface 5c Cylindrical inner space 5d Female thread part (fastening means)
5e Press surface 6 2nd clamping member (clamping member)
6A Outer fitting portion 6B Pressing portion 6C Fallout prevention arm 6a Outer surface (mounting restricting portion)
6b Inner surface 6c Cylindrical internal space 6d Insertion hole 6e Press surface 7 Fastening means 7A Fastening bolt (fastening means)
7a Male thread part 62 Fastening bolt (fastening means)
62a Projecting male screw part 64 Fastening nut (fastening means)
P Flange joint reinforcement jig C Recess

Claims (11)

A pair of clamping members each having a pressing part that can be brought into contact with the outer side surfaces of both flange parts connected to the bolts, and the pressing parts of the both holding members applied to the outer side surfaces of both flange parts. A flange joint reinforcement jig comprising fastening means for pulling both clamping members in the flange joining direction and fastening them together,
An inner fitting portion and an outer fitting portion that are fitted from the flange joining direction at a radially outer side position than the outer peripheral surface of the both flange portions are formed at portions facing each other in the flange joining direction of the both holding members. The flange joint reinforcement jig.   In a state in which the inner fitting portion and the outer fitting portion of the both holding members are fitted, the pressing portion of one holding member, the inner fitting portion, the pressing portion of the other holding member, and the outer The recessed portion formed by the fitting portion is configured to be able to be fitted from the outside in the radial direction with respect to the adjacent portion of the bolt connection portion in the both flange portions, and the outer fitting portion is formed by the both flanges. The flange joint part reinforcement jig of Claim 1 comprised by the mounting control part which controls to a setting external fitting mounting position by contact | abutting with the outer peripheral surface of a part.   The flange joint reinforcement jig according to claim 1 or 2, wherein the inner fitting portion and the outer fitting portion are configured in a fitting shape incapable of relative rotation.   The inner fitting portion and the outer fitting portion are each configured in a cylindrical shape, and a fastening bolt of the fastening means is inserted through a cylindrical inner space between the inner fitting portion and the outer fitting portion. Item 4. The flange joint reinforcement jig according to any one of Items 1 to 3.   One of the both holding members is provided with a drop-off prevention arm that can come into contact with the head of a connecting bolt that connects both flange portions or a connecting nut that is screwed to the connecting bolt from the radially inner side. The flange joint reinforcement jig according to any one of claims 1 to 4.   The flange joint reinforcing jig according to claim 5, wherein the drop-off prevention arm is formed in a concave shape that turns from a radially inner side to a radially outer side with respect to a head of the connecting bolt or the connecting nut. .   The drop-off prevention arm is formed to extend from one radially inner side portion of the both clamping members, and the extension direction of the drop-off prevention arm is rotated when the fastening bolt is rotated to the tightening side. The flange joint reinforcement metal fitting of Claim 6 set to the same direction as the direction where one provided holding member rotates together.   The side surface of the drop-off prevention arm that faces the outer surface of the flange portion is disposed on the side farther from the outer surface of the flange portion than the pressing surface of the pressing portion of one holding member provided with the drop-off prevention arm. The flange joint reinforcement jig according to any one of claims 5 to 7.   The fastening means is inserted into the cylindrical inner space of the inner fitting part and the outer fitting part from the outside of the outer fitting part, and the inner peripheral surface of the inner fitting part The flange joint part reinforcement jig of Claim 4 comprised from the internal thread part with which the said fastening volt | bolt formed in this is screwed together.   The fastening means is inserted into the cylindrical inner space of the inner fitting portion and the outer fitting portion in a penetrating state from one outer side, and the projecting male screw portion of the fastening bolt is the other The flange joint reinforcement jig according to claim 4, comprising a fastening nut screwed from the outside of the flange.   The flange joint portion reinforcing jig according to claim 9, wherein the female screw portion is formed at one end portion of the inner peripheral surface of the inner fitting portion on the outer fitting portion side.

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