JPH0680973U - Pipe deformation prevention device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent deformation of the pipe due to welding heat. A pair of semi-annular support members 11, 11 having a shape obtained by dividing an annular body having a curvature substantially equal to the curvature of the inner peripheral portion of the tube 2 which is to be prevented from being deformed, and the end members 10, 10 have a predetermined structure. A bolt 14 and a nut 13, which connect the end members 10, 10 of the respective semi-annular support members 11, 11 arranged so as to face each other in parallel with each other so as to be able to approach and separate from each other,
13 'and the end members 10, 1 of the semi-annular support members 11, 11.
It is composed of a jack 15 which can be inserted between 0s. [Effect] The bolt 14 and the nuts 13 and 13 'are inserted into a predetermined position in the pipe 2 and slightly enlarged by the jack 15.
The pair of semi-annular support members 11, 11 fixed by the above prevent deformation of the tube 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe deformation preventing device.

[0002]

[Prior art]

 When welding a nozzle to a pipe in a large-diameter pipe such as a nuclear power plant or a chemical plant, as shown in FIG. 10, the inner surface of the pipe 2 facing the hole 3 provided in the pipe 2 for mounting the nozzle 1 , A plate-shaped jig 4 whose lower surface is formed to match the inner surface of the pipe 2 and whose upper surface is flat is placed, and a jack 5 having a required height is placed on the jig 4. A disk-shaped jig 6 having a diameter slightly larger than the outer diameter of the nozzle base 1 is placed on the jack 5, the nozzle base 1 inserted into the hole 3 is placed on the jig 6, and the jack 5 is appropriately mounted. After the nozzle base 1 is expanded and contracted to be positioned at a predetermined height, the nozzle base 1 is temporarily welded to the pipe 2, and then the nozzle base 1 and the pipe 2 are main welded.

In addition, as shown in FIG. 11, a ring-shaped jig 7 having an outer diameter that allows the inner diameter of the pipe 2 to be fitted slightly tightly is inserted into the pipe 2 for fitting the pipe base 1 therein. It is arranged in the vicinity of the hole 3, and after the nozzle 1 is temporarily welded to the pipe 2, the pipe 2 and the nozzle 1 are main welded.

[0004]

[Problems to be solved by the device]

 However, in the mounting work of the nozzle shown in FIG. 10, since the jack 5 is arranged in the center of the inside of the pipe 2, the existence of the jack 5 hinders the work, and the pressing force of the jack 5 causes the pressing force of the jack 2 to rise. The pipe 2 is apt to be deformed in the extension direction of the jack 5 because it acts locally on a part of the.

On the other hand, in the mounting work of the nozzle shown in FIG. 11, there is nothing to support and restrain the nozzle 1, so that the welded portion between the nozzle 1 and the pipe 2 is deformed toward the inner surface side of the pipe 2. There were problems such as a large amount (decline).

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a deformation preventing device for a pipe that can prevent the deformation of the pipe when welding a nozzle or the like to the pipe. .

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, in the pipe deformation prevention device of the present invention, a pair of annular bodies having an outer peripheral portion having a curvature substantially equal to the curvature of the inner peripheral portion of the pipe whose deformation is to be prevented is divided into two. And a connecting member for connecting the divided end faces of the semi-annular support member, which are arranged so that the divided end faces are parallel to and face each other with a predetermined gap, and the semi-annular support member. And a tool for expanding the space that can be inserted between the divided end faces of the.

Further, in the apparatus for preventing deformation of a pipe of the present invention, a pair of semi-annular supports having a shape in which an annular body having an outer peripheral portion having a curvature substantially equal to the curvature of the inner peripheral portion of the pipe whose deformation is to be prevented is divided into two. The holding member and the divided end faces of the semi-annular support member, which are arranged so as to face each other in parallel with each other with a predetermined gap, are capable of approaching and separating from each other, and the inner peripheral portion of the pipe and the outer periphery of the semi-annular support member. A connecting member that connects the parts so that they can be pressure-bonded to each other and a tool for expanding the space that can be inserted between the divided end faces of the semi-annular support member are provided.

Further, in the pipe deformation preventing apparatus of the present invention, in the above-described structure, the pipe uses the semi-annular support member capable of supporting the end portion of the welding sliding member protruding into the pipe.

[0010]

[Action]

 In the apparatus for preventing deformation of a pipe according to claim 1 of the present invention, a pair of semi-annular support members connected by a connecting member and formed in a substantially annular shape are inserted into a pipe whose deformation is to be prevented, and an end surface of the semi-annular support member is inserted. If the connecting members are adjusted and fixed so that the outer circumferences of the semi-annular support members come into pressure contact with the inner circumference of the pipe and the outer circumferences of the semi-annular support members are crimp-fixed to the inner circumference of the pipe, Prevents deformation of the pipe due to welding heat.

Further, in the deformation preventing device for a pipe according to claim 2 of the present invention, a pair of semi-annular support members which are connected to each other by a connecting member and which are formed in a substantially annular shape are inserted into the pipe which is to be prevented from being deformed, In addition, the space widening tool interposed between the ends of the semi-annular support member that are prematurely moved is actuated in the expanding direction so that the end faces of the semi-annular support member are separated from each other and the outer peripheral portion of the semi-annular support member is pressed against the inner peripheral portion of the pipe. By adjusting and fixing the connecting member and crimping and fixing the outer peripheral portion of the semi-annular support member to the inner peripheral portion of the pipe, the semi-circular support member prevents deformation of the pipe due to welding heat or the like.

Further, in the apparatus for preventing deformation of a pipe according to claim 3 of the present invention, a pair of semi-annular support members connected by a connecting member and formed in a substantially annular shape are inserted into the pipe to prevent deformation, In addition, the end of the member to be welded to the pipe protruding into the pipe is brought into contact with the semi-annular support member so that the end faces of the semi-annular support member are separated from each other and the outer peripheral portion of the semi-circular support member is pressed against the inner peripheral portion of the pipe. If the connecting member is adjusted and fixed to and the outer peripheral portion of the semi-annular support member is pressure-bonded to the inner peripheral portion of the pipe, the semi-circular support member prevents deformation of the pipe due to welding heat or the like.

[0013]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 show the outline of a first embodiment of a pipe deformation preventing apparatus according to the present invention, and the same parts as those in FIG. 10 are designated by the same reference numerals.

Reference numerals 11 and 11 denote a pair of semi-annular supporting members, and the semi-annular supporting members 11 and 11 have an annular body having an outer peripheral portion having a curvature substantially equal to that of the inner peripheral portion of the pipe 2 which is to be prevented from being deformed. Is a semi-annular shape that is divided into two, has a predetermined width, and extends in the circumferential direction by abutting on the inner peripheral surface of the tube 2, and in order to reinforce the shell 8, a predetermined width is provided in the radial direction. A web 9 which is provided and extends along the inner circumference of the shell 8 and is fixedly mounted on the inner surface of the shell 8, and the shell 8 and the both ends of the web 9 in the circumferential direction which are parallel to the diameter of the web 9. And an end member 10 having a surface extending in the direction. When the end member 10 is inserted and arranged in the pipe 2, the end members 10 and 10 face each other and a jack 15 described later is interposed between the end members 10 and 10. Are formed so that a predetermined interval for

The end member 10 is provided with four bolt holes 12 on each surface at predetermined intervals in the radial direction and the width direction of the semi-annular support member 11, so that the end member 10 has a predetermined interval. In order to allow the end members 10 of the respective semi-annular support members 11 arranged so as to be parallel and opposite to each other to move toward and away from each other, a bolt 14 having nuts 13 and 13 ′ that abut against opposite surfaces of the end members 10 is provided. It is inserted through the bolt hole 12.

A jack 15 can be inserted between the end members 10, 10 of the semi-annular support members 11, 11.

Hereinafter, a procedure for preventing the deformation of the pipe by the deformation preventing device of the present embodiment will be described.

A pair of the semi-annular support members 11, 11 which are connected to each other by a bolt 14 and which are formed in an annular shape are inserted into predetermined positions in the pipe 2 where deformation is to be prevented, and the semi-circular support members 11, 11 are opposed to each other. By operating the jack 15 inserted between the end members 10, 10 to be extended, the outer peripheral surfaces of the shells 8 of both semi-annular support members 11 are crimped to the inner peripheral surface of the pipe 2 and screwed to the bolt 14. By rotating the combined nut 13 ′ in the direction of abutting the end member 10, the gap between the end members 10 and 10 of the semi-annular support members 11 and 11 pressed by the jack 15 is set by the bolt 14. Hold and fix.

Thus, the semi-annular support member 11 arranged and fixed at a predetermined position in the tube 2 prevents the tube 2 from being deformed due to welding heat or the like.

In the present embodiment, the outer peripheral surface of the semi-annular support member 11 having a shape capable of contacting the inner surface of the pipe 2 is crimped to the inner peripheral surface of the pipe 2 by the jack 15, and the nuts 13 and 13 ′ are tightened. Since the bolt 14 is formed so as to be able to maintain that state, the deformation of the pipe 2 due to welding heat or the like can be completely prevented.

Although the above description is for the case where the outer peripheral surface of the semi-annular support member 11 is crimped to the inner peripheral surface of the pipe 2 using the jack 15, the nut 13 ′ is adjusted to adjust the semi-annular support member 11. When the purpose can be achieved by crimping the outer peripheral surface to the inner peripheral surface of the tube 2, it is not necessary to use the jack 15.

4 to 6 show the outline of the second embodiment of the pipe deformation preventing device of the present invention, and the same parts as those in FIGS. 1 to 3 are designated by the same reference numerals.

Reference numerals 18 and 18 denote a pair of semi-annular support members, and the semi-annular support members 18 and 18 are annular bodies having an outer peripheral portion having a curvature substantially equal to the curvature of the inner peripheral portion of the pipe 2 which is to be prevented from being deformed. It is composed of a main body 16 of a semi-annular plate which is divided into two parts, and end members 17 provided at both ends of the main body 16 in the circumferential direction and having surfaces extending in a direction parallel to the diameter of the main body 16. When arranged, the surfaces of the end members 17 face each other, and a predetermined space for inserting a wedge 22 described later is formed between the surfaces of the end members 17.

The end member 17 is provided with four bolt holes 19 on each surface at predetermined intervals in the radial direction and width direction of the semi-annular support member 18, so that the end member 17 has a predetermined interval. A bolt 21 having a nut 20 that abuts on the outer surface of the end member 17 is provided so that the end member 17 of each of the semi-annular support members 18 arranged so as to be parallel and opposite to each other can approach and separate from each other. Has been inserted into.

A wedge 22 can be inserted between the end members 17, 17 of the semi-annular support members 18, 18.

Hereinafter, a procedure for preventing the deformation of the pipe by the deformation preventing device of the present embodiment will be described.

The pair of semi-annular support members 18, 18 that are connected by bolts 21 and are formed in an annular shape are inserted into predetermined positions in the pipe 2 where deformation is to be prevented, and the semi-circular support members 18, 18 are opposed to each other. By pushing a wedge 22 inserted between the end members 17, 17, the outer peripheral surface of the main body 16 of both semi-annular support members 18 is crimped to the inner peripheral surface of the pipe 2 and screwed into the bolt 21. By rotating the nut 20 in the direction of tightening the end member 17, the gap between the end members 17, 17 of the semi-annular support members 18, 18 pressed by the wedge 22 is held and fixed.

Thus, the semi-annular support member 18 arranged and fixed at a predetermined position in the tube 2 prevents the tube 2 from being deformed due to welding heat or the like.

In this embodiment, the wedge 22 is driven between the end members 17, 17 of the semi-circular support members 18, 18 so that the semi-circular support members 18, 18 have a shape capable of abutting against the inner surface of the pipe 2. Since it is formed by crimping on the inner peripheral surface of the pipe 2 and keeping the state by the bolt 21 into which the nut 20 is tightened, the deformation of the pipe 2 due to welding heat or the like can be completely prevented.

7 to 9 show the outline of the third embodiment of the pipe deformation preventing device of the present invention, and the same parts as those in FIGS. 1 to 3 are designated by the same reference numerals.

Reference numeral 26 denotes one semi-annular support member, and the semi-annular support member 26 divides an annular body having an outer peripheral portion having a curvature substantially equal to the curvature of the inner peripheral portion of the tube 2 which is to be prevented from being deformed into two parts. A semi-annular plate material having a shape in which the outer periphery is in contact with the inner peripheral surface of the pipe 2 and extends in the circumferential direction to have a predetermined width in the radial direction and which is adapted to the end of the nozzle base 1 to be welded to the pipe 2. The main body 23 is formed by connecting the five main bodies 23 each having a central portion of the outer periphery formed with the five main bodies 23 arranged at predetermined intervals so that the surfaces are parallel to each other. An end member 24 having a predetermined width extending in the parallel direction is fixed to the central portion of the main body 23 in the circumferential direction, has a predetermined width in the radial direction of the main body 23, penetrates the main body 23 in the parallel direction, and has a radius of the main body 23. A nozzle support member 25 whose outer end in the direction is shaped to fit the end of the nozzle 1. Consists of.

Reference numeral 30 denotes the other semi-annular support member, and the semi-annular support member 30 divides an annular body having an outer peripheral part having a curvature substantially equal to the curvature of the inner peripheral part of the tube 2 which is to be prevented from being deformed into two parts. It is a semi-annular plate material, and the outer circumference is in contact with the inner peripheral surface of the pipe 2, and the five main bodies 27 extending in the circumferential direction and having a predetermined width in the radial direction are provided with a predetermined interval so that the surfaces are parallel to each other. An end member 28 having a predetermined width extending in the parallel direction of the main body 27 by connecting both circumferential end portions of the five main bodies 27 arranged side by side and fixed to the central portion of the main body 27 in the circumferential direction. The connecting member 29 has a predetermined width in the radial direction of 27 and penetrates in the parallel direction of the main body 27.

When the respective semi-annular support members 26, 30 are inserted and arranged in the pipe 2, the respective end members 24, 28 face each other and a jack 15 described later is interposed between the end members 24, 28. There is a predetermined interval for the operation.

The end members 24, 28 are provided with eight bolt holes 31 on each surface at predetermined intervals in the radial direction and the width direction of the semi-annular support members 26, 30. The end members 24, 28 of the respective semi-annular support members 26, 30 which are arranged so as to be parallel to and face each other at a predetermined interval are arranged on the opposite surfaces of the end members 24, 28 so that they can approach and separate from each other. A bolt 14 having nuts 13 and 13 'that abut on is inserted into the bolt hole 31.

The jack 15 can be inserted between the end members 24, 28 of the semi-annular support members 26, 30.

The procedure for preventing the deformation of the pipe by the pipe deformation preventing device of the present embodiment will be described below.

The pair of semi-annular support members 26, 30 connected by bolts 14 and formed in an annular shape are inserted into the welded portion of the nozzle 1 in the pipe 2 where deformation is to be prevented, and the semi-annular support members 26, 30 are inserted. By operating the jack 15 inserted between the opposing end members 24 and 28 of 30 in the extending direction, the outer peripheral surfaces of the main bodies 23 and 27 of the semi-annular support members 26 and 30 and both end portions of the nozzle support member 25. Is pressed against the inner peripheral surface of the pipe 2, and the nut 13 'screwed onto the bolt 14 is turned in the direction of abutting against the end member 24, so that the semi-annular support members 26, 30 are pressed by the jack 15. The space between the end members 24 and 28 of the above is fixed and held by the bolt 14.

Then, the nozzle base 1 is inserted into the hole 3 provided in the pipe 2 in advance, and the end of the nozzle base 1 is placed on the main body 23 of the semi-annular support member 26 and the nozzle base support member 25. Then, the nozzle base 1 and the inner edge of the hole 3 of the pipe 2 are welded.

At this time, the pair of semi-annular support members 26 and 30 arranged and fixed immediately below the nozzle base in the pipe 2 prevent the pipe 2 from being deformed by welding heat or the like.

In this embodiment, a semi-circular support member 26 having a shape capable of abutting the inner surface of the pipe 2 and the end of the nozzle base 1 and a semi-circular support member 30 paired with the semi-circular support member 26 are provided. Since it is formed so as to be crimped to the inner peripheral surface of the pipe 2 by the jack 15 and can be kept in that state by the bolt 14 into which the nuts 13 and 13 'are tightened, the deformation of the pipe 2 due to welding heat is completely prevented. it can.

Although the above description is for the case of using the jack 15, the outer peripheral surfaces of the main bodies 23 and 27 and both end portions of the nozzle support member 25 are crimped to the inner peripheral surface of the pipe 2 by adjusting the nut 13 ′. Therefore, it is not necessary to use the jack 15 when the purpose can be achieved.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0044]

[Effect of device]

 In any of the deformation preventing devices for a pipe according to claims 1 to 3 of the present invention, a pair of semi-annular support members that substantially match the pipe diameter can be inserted into the pipe and slightly expanded in the required two directions. Since it is formed, a space is created in the center of the pipe to improve workability.In addition, since the expanding force of the semi-annular support member acts widely on the inner circumference of the pipe, it is easy to hold the perfect circle of the pipe and Since it is difficult for deformation to occur, it is possible to achieve various excellent effects that the deformation of the pipe can be completely prevented.

[Brief description of drawings]

FIG. 1 is a front view schematically showing a first embodiment of a pipe deformation preventing device according to the present invention.

FIG. 2 is a view taken along the line II-II of FIG.

FIG. 3 is a view on arrow III-III in FIG. 1.

FIG. 4 is a front view schematically showing a second embodiment of the pipe deformation preventing device according to the present invention.

5 is a view taken along the line VV of FIG.

6 is a VI-VI arrow view of FIG. 4. FIG.

FIG. 7 is a side sectional view schematically showing a third embodiment of the pipe deformation preventing apparatus according to the present invention.

FIG. 8 is a view on arrow VIII-VIII in FIG. 7.

9 is a view on arrow IX-IX in FIG. 7. FIG.

FIG. 10 is a front view showing an example of a conventional nozzle mounting work.

FIG. 11 is a front view showing another example of the conventional mounting operation of the nozzle.

[Explanation of symbols]

 1 Pipe base (member to be welded) 2 Pipe 10, 17, 24, 28 End member (divided end face) 11, 18, 26, 30 Semi-annular support member 13, 13 ', 20 Nut (connecting member) 14, 21 Bolt (Connecting member) 15 Jack (tool for expanding the space) 22 Wedge (device for expanding the space)

Claims (3)

[Scope of utility model registration request] 1. A pair of semi-annular support members having a shape obtained by dividing an annular body having an outer peripheral portion having a curvature substantially equal to the curvature of the inner peripheral portion of the pipe, which is to be prevented from being deformed, and a predetermined distance between the divided end faces. And a connecting member for connecting the divided end faces of the semi-annular support members arranged so as to face each other in parallel so as to be able to approach and separate from each other, and a gap enlargement tool that can be inserted between the divided end faces of the semi-annular support member. A device for preventing deformation of a pipe, which is characterized by: 2. A pair of semi-annular support members having a shape obtained by dividing an annular body having an outer peripheral portion having a curvature substantially equal to the curvature of the inner peripheral portion of the pipe which is to be prevented from being deformed, and the divided end faces having a predetermined interval. A connection for connecting the divided end surfaces of the semi-annular support members arranged parallel to each other so as to be opposed to each other such that the inner peripheral portion of the pipe and the outer peripheral portion of the semi-annular support member can be pressure-bonded and held. A deformation preventing device for a pipe, comprising: a member; and an interval expanding tool that can be inserted between the divided end faces of the semi-annular support member. 3. A pipe deformation preventing device according to claim 1, wherein a semi-annular support member capable of supporting an end of the member to be welded to the pipe protruding into the pipe is used. .