JPS61286690A - Pipe slip-off preventive device for pipe joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method of tightening a material on the outer circumferential surface of the pipe at a joint portion where two pipes for underground burial are connected in a flexible and expandable manner. This invention relates to a pipe detachment prevention device for a pipe joint, which is comprised of two types of pipe *a prevention fittings that are divided into a plurality of pieces.

[Conventional technology]

FIG. 11 and FIG. 12 show an example of a conventional pipe detachment prevention device for a pipe joint in a water pipe.

This conventional device attaches a rubber ring 12 to the outer circumferential surface of the water pipe 1 on the insertion side, and fits the end of the pipe into the socket of the water pipe 2.
Watertightness between both pipes 1 and 2 is maintained. in this case,
The outer diameter of tube 1 is set smaller than the inner diameter of tube 2,
In the fitted state, a predetermined gap 13 is formed between the outer diameter of the tube 1 and the inner diameter of the socket portion of the tube 2. This gap 1
3 absorbs the displacement in order to allow the joint portion of the pipes 1 and 2 to be displaced in the radial direction and deflect within a predetermined range when the soil moves due to automobile driving, earthquakes, etc. This is to prevent damage to each tube end of the joint.

Therefore, in addition to having flexibility, such a pipe joint part must also prevent the water pipe 1 from separating from the water pipe 2, and a prevention device 3 for this purpose is required. The conventional tube detachment prevention device 3 consists of a metal fitting 4 and a metal fitting 5, and the metal fittings 4 and 5 are each formed by being divided into two pieces. To attach the fitting 4 to the water pipe 1, insert the fastening bolt 7 from one side of the flange 6.6 of the half-split fittings 4a, 4b into the round bolt hole formed in the flange 6.6, and then insert the fastening bolt 7 from the other side. This is done by screwing and tightening the nut 8 onto the bolt 7 on the flange 6 side. As a result, the metal fitting 4 is firmly (fixed) to the water pipe 1. In the case of the water pipe 2 and the metal fitting 5, the metal fitting 5 is fastened to the water pipe 2 in the same manner as described above.

By the way, in order to prevent water pipe 1 and water pipe 2 from separating, it is necessary to suppress axial movement between both pipes 1 and 2 that exceeds the allowable extension range. Therefore, in the pipe separation prevention device 3, one end side of the connecting rod 9 can be freely rotated to a locking plate 14.14 formed at a position offset by 90 degrees in the circumferential direction from the flange 6.6 of the metal fitting 5. It is attached to. Then, the other end side of the connecting rod 9 is fitted between the locking plates 10.10 formed at a position offset by 90 degrees in the circumferential direction from the flange 6.6 of the metal fitting 4, and the distal end locking portion 9a is locked. By engaging the end face of the plate 10.10 opposite to the metal fitting 5, the metal fittings 4 and 5 are prevented from coming apart. In addition, 11
is a screw member for preventing detachment due to rotation of the connecting rod 9 fitted into the locking plate 10.10.

[Problem that the invention seeks to solve]

As is clear from the above configuration, the connection lll9.9 for preventing the pipe from detaching is either attached to the metal fitting 4.5 in advance at a factory or the like and prevented from rotating and detaching using the bolt 11, or it can be installed at the site. You need to install it in the same way. As shown in Fig. 11, the actual work involves tightening the flanges 6, 6, bolts 7, and nuts 8 below and above the water pipes 1, 2 (Fig. 11 only shows the upper fitting parts). The locking plates 14, '14 and 10.10 are positioned on the horizontal side.

For this reason, there was a drawback that it was difficult to fasten the bolt 7 and nut 8 located below. There are usually a huge number of such joints in the construction section,
The overall workability was poor (and the time required for fastening was long, which caused the construction period to be extended. Also, the structure of the metal fittings fastening part did not require digging up to the bottom of the water pipes 1 and 2). If not, bolt 7 and nut 8 in the lower position
There is a drawback that the fastened state cannot be visually confirmed, and workability is also poor in this case. Furthermore, since it was necessary to tighten the bolt 7 and nut 8 located at the lower position and to confirm the tightening condition, it was necessary to secure sufficient work space, and it was necessary to excavate a wide area around the joint. 4 and 5 are bolt 7, nand 8 and bolt 1
It is normal to prepare with 1 concluded. Therefore, when connecting to the water pipe 1.2, screw the bolt 7 and napht 8 and remove them from the fitting 4.5.
The fastening work must be performed after each of the metal fittings 4.5 is separated into two halves, and many bolts must be removed and tightened, which is a disadvantage in that it is time-consuming.

Furthermore, when changing the amount of expansion and contraction, the length of the connecting rod 9°9 must be changed, but with the configuration of the metal fitting 5,
Since the connecting rods 9, 9 are integrally formed with the half-split metal fittings 5a, 5b, it is not possible to change only the connecting rods 9, 9, and it is necessary to replace the entire metal fitting 5 with another one.

The present invention has been made to improve and eliminate the above-mentioned drawbacks of the conventional art, and it is an object of the present invention to provide a pipe separation prevention device for a pipe joint with excellent workability.

[Means for solving problems]

The means of the present invention for solving the above-mentioned problems consists of a plurality of two parts that are tightened on the outer peripheral surface of the pipe at the joint part where the pipes are connected in a flexible and expandable manner.
A type of tube detachment prevention fitting, in which the tube detachment prevention fitting on one side is a protruding piece that protrudes from the tip of the flange portion formed at both ends of each split piece metal fitting toward the flange portion of the other neighboring split piece fitting. is formed, and a T is formed on one side of each opposing flange portion.
A long hole into which the head of the T bolt can be inserted and a seating part for the head are formed on the other side of the bolt insertion hole, and one pipe and the other pipe are formed between the opposing flanges and the protruding pieces. An insertion space for a connecting rod is formed to connect the two. In addition, the other side tube detachment prevention fitting has a mating surface that abuts the flange portion of the other neighboring split piece fitting on the flange portion formed at both ends of each split piece fitting, and has a mating surface that abuts the flange portion of the other neighboring split piece metal fitting, and has a mating surface that abuts the flange portion of the other neighboring split piece fitting, and has a mating surface that abuts the flange portion of the other neighboring split piece metal fitting. A through hole is bored through the connecting rod.

[For production]

As shown in the embodiment of FIG. 1 to FIG. 5
It is inserted into 1. The head 57a is seated in the seating portion 21 of the flange 18 on the other side so as to intersect with the elongated hole 51, and fastens the respective split pieces 16a and 16b. The connecting rod 22 connects to the flange portion 18.1 of the metal fitting 16.
8 and the protrusion piece 19.19, and is capable of some movement in the radial and axial directions. In addition, in the metal fitting 17 on the other side, the mating surfaces 34.35 formed on the flanges 32.33 of the respective split piece metal fittings 17a, 17b abut each other, and the screws of the connecting rod 22 are inserted into the through holes 36, 37. The portion 38 side is inserted.

Then, it is fastened with a nut 39.

To attach or remove the metal fitting 16, loosen the nut 8, rotate the head 57a of the T-bolt 57 by 90 degrees, align it with the long hole 51 direction of the flange 18, and then remove it. All you have to do is loosen the nut 39 and pull out the split metal piece 17b. Therefore, the fittings 16 and 17 can be attached and detached using the T-bolt 57.
There is no need to attack and remove the connecting rod 22, and the nuts 8 and 3
All you have to do is loosen 9, and the workability is very good.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in more detail below with reference to the drawings based on an embodiment of a split fitting used for water pipes. Note that the same reference numerals as in the conventional case indicate intermediate members.

〔Example〕

FIG. 1 is an overall perspective view showing a state in which the pipe detachment prevention device 15 is attached to a water pipe 1.2, and FIG. 2 is an exploded perspective view of the same. Note that, as in the conventional case, the water pipe 1 and the water pipe 2 are connected flexibly and expandably. The tube detachment prevention device 15 is made up of a metal fitting 16 and a metal fitting 17, and the metal fittings 16 and 17 are each formed in two pieces. Moreover, as shown in FIG. 3, the surface of the metal fitting 16 that comes into contact with the water pipe 1 is made of a cast surface or roughened by machining or the like, and is provided with a non-slip surface 30. Note that the metal fitting 17 is restricted from moving in the left direction in FIG. Good things are natural.

Flange portions 18 are formed at both ends of each of the half-split metal fittings 16a, 16b. Each flange part 18
A projecting piece 19 that projects toward the other opposing flange portion 18 is formed at the tip. The protrusion height of this protrusion piece 19 is such that when the protrusion piece 19 is in the fastened state described later, the protrusion piece 19 facing the
Even when they are in contact with each other, the connecting rod 22 can move to some extent in the vertical direction in FIGS. 1 and 2. This is to allow the water pipes 1 and 2 to bend in the radial direction. An insertion hole 50 for a T-bolt 57 is bored in the flange portion 18 of the half-split metal fitting 16a on one side. Further, the flange portion 18 of the other half-shaped metal fitting 16b is formed with a long hole 51 along the radial direction through which the T-bolt head 57a can be freely inserted, and a seating portion 21 for the T-bolt head 57a. There is. The seating portion 21 is connected to the flange portion 1
It is formed along the tube axis direction on the outer surface side of the tube 8, and has an R-surface recess 21a (see FIGS. 4 to 7).

Further, flanges 32.33 in a direction perpendicular to the tube axis direction are formed at both ends of each of the half-shaped metal fittings 17a, 17b.As shown in FIG. There are no matching faces 34 and 35.

Therefore, when the mating surfaces 34, 35 are in abutment, the flange upper end surface 41, 41 of the metal fitting 17b is in contact with the metal fitting 17a.
The lower end surface 42.42 of the metal fitting 17a abuts against and is placed on the shoulder 43.43 of the metal fitting 17b. Further, the lower end surface 45.45 of the metal fitting 17b is a cutout piece 44.45 formed on the abutment surface 34.34 of the metal fitting 17a.
Therefore, the mating surface 34.35
When the front metal fittings 17a and 17b are in contact with each other, they do not deviate from each other in the vertical direction in the figure.A connecting rod 22.22 is located approximately at the center of the flange 32.32 of the metal fitting 17a.
Through hole 36.36 for inserting the screw portion 38.38 of
is drilled. Also, the flange 33.3 of the metal fitting 17b
3 is provided with a U-shaped through hole 37.37.

46.46 is a cutout piece formed on the upper side of the mating surface 34.34. This cutout piece 46.46 is the metal fitting 17b.
It fits into the U-shaped through hole 37 and functions as a part of the wall surface of the through hole of the connecting rod 22,22. The cutout pieces 46, 46 are not necessarily required.

The connecting rod 22.22 in this embodiment has a locking portion 23 formed at one end of a prismatic body and a threaded portion 38 formed at the other end, and is independent and separate from the metal fittings 18.17. are doing.

Next, the procedure for installing the tube detachment prevention device 15 constructed as described above will be explained.

In addition, in the preparation state of this tube membrane prevention device 15, as shown in FIG. 10, the half-shaped fittings 16a and 17a are attached to the connecting rods 22, 22, and the half-shaped fittings 16b are attached.

17b are placed on the connecting rods 22, 22 and tied together. Therefore, when stored, the volume occupied by these items can be approximately halved.

For installation, from the preparation state to the napht 8 of the T-bolt 57.
Loosen the NANDs 39, 39 of the connecting rods 22.22, and fit the half-split fittings 16b, 17b onto the water pipes 1 and 2 from below. Next, connect the connecting rods 22.22.
22 still attached, half-split metal fittings 16a and 17a.
and placed from above the water pipe 1.2 and fitted onto this,
The half-split metal fittings 16a and 16b and 17a and 17b are tied together. After that, in this engaged state, the loosened T-bolt head 57a is inserted into the elongated hole 51 of the half-split metal fitting 16b and engaged with the R-view portion 21a of the seating portion 21. . Then, by screwing together the nut 8 and the T-bolt 57, the metal fitting 16 can be attached to the water pipe 1. In addition, the metal fitting 17 can be attached to the water pipe 2 by further abutting the mating surfaces 34 and 35 of the flanges 32 and 33 from the above-mentioned tied state and tightening the nuts 39 and 39. be.

For installation work of such a tube detachment prevention device 15, T
Since each flange part 18 of the fastening part of the bolt 57 and the attachment part of the connecting rod 22 is located on the horizontal side of the water pipe 1.2, there is no need to dig up the earth below the water pipe 1, 2. ,
Work is simple, easy and quick. Also T bolt 57
The nut 8, connecting rod 22, and napht 39 do not need to be completely unthreaded to separate them; they only need to be loosened, which saves the trouble of searching for these members individually, and simplifies the work. I can figure it out. For these reasons, T-Bolt 5
7 with the nut 8 screwed together, and the connecting rod 22 with the half-split metal fitting 17a attached and the bolt 39 screwed together,
By upsetting the tips of the T-bolt 57 and the connecting rod 22, it is possible to prevent the worker from accidentally tightening the nut 8.39.

In the state after installation, the head of T bolt 57 e557 a
As shown in FIGS. 4 to 7, the half-split metal fitting 16b
The R-view portion 21a of the seating portion 21 formed in the seat portion 21 prevents its rotation, and at the same time determines the position of the T-bolt 7, thereby making it possible to reliably form an insertion space for the connecting rod 22. Further, as shown in FIGS. 3 to 7, the connecting rod 22 is connected in the radial direction and in the space 24 formed between the opposing flanges 18.18 and the protruding pieces 19.19.
A gap is formed between each member so that the bolt 57 can move to some extent in the axial direction. This gap is the water pipe 1
This is to prevent the connecting rod 22 from interfering with the bending of the water pipe 2 in the radial direction at the joint portion. Thereby, the water pipes 1 and 2 can freely bend in the radial direction within the range of the gap 13 shown in FIG. The space 24 can be filled with an elastic material such as rubber, and in FIG.
An embodiment of an adhesive member (made of rubber) 47 of a type that fills the space 24 while being inserted into the member is shown. 48 is a through hole formed in the tension member 47 through which the T bolt 57 is inserted. The shape of this adhesive member 47 does not need to be particularly limited; for example, it can be formed as shown in FIG. 8. In the figure, 49 is a single hole through which the connecting rod 22 is inserted. ! ! In the case of using the attaching member 47, there are a few (half-split fittings 16a, connecting rods 22゜22, half-split fittings 17a, T-bolts 57).
It is possible to integrate the Furthermore, the locking portion 23 of the connecting rod 22 is spaced apart by a predetermined distance from the end surface 18a of each flange portion 18, and can be moved in the axial direction by the distance. In other words, the expansion/contraction/flexibility of the water pipes 1 and 2 can be guaranteed. If you want to change the allowable amount of expansion/contraction, just adjust the screwing state of the Nara (39.39). In addition, Figure 3 and Figure 41! In I, 5B is an elastic material attached to the distal end side of the connecting rod 22, and functions as a member that ensures the expansion/contraction/flexibility of the water pipes 1 and 2. Further, the elastic material 58 expands, contracts, and flexes when the metal fittings 16 and 17 are in a normal state in which no expansion, contraction, or flexibility occurs.
It also has the function of preventing unnecessary gaps from being formed between the metal fittings 16 and 17, and also functions to prevent the mutual connection between the metal fittings 16 and 17 from loosening in the normal state.

In addition, as a means for ensuring movement of the connecting rod 22 in the radial direction and axial direction, each flange portion 18° 32, 33
Therefore, each flange part 1B, 32, 33 is not divided in the radial direction, etc., and can be constructed as a single plate, and exhibits sufficient strength. It is possible to do so.

The metal fittings 16 and 17 can be removed in the reverse order as described above. Even in this case, it is not necessary to completely separate the T-bolt 57 and the nut 8 and the connecting rod 22 and the nut 39.

By the way, the present invention is not limited to the above-described embodiments, and can be modified as appropriate. For example, the connecting rod 22 may be a round bar rather than a prismatic body. Even in this case, there is no need to remove the nut of the connecting rod 22 during construction work, and the metal fittings 16 and 17 are water pipe 1
It can also be used for pipe materials other than the water pipe 2, ring materials, etc. Furthermore, it goes without saying that the metal fittings 16 and 17 may be divided into a plurality of parts, such as three or four parts, other than two parts.

〔Effect of the invention〕

As explained above, in the present invention, the flange part, which is the fastening part between the T-bolt and the NAND, and the flange part, which is the fastening part between the connecting rod and the NAND, are located on the horizontal side of the pipe, and the T-bolt and the connecting The structure is such that the pipe-to-pipe joints do not separate in the process of simply tightening the nut on the rod, making the fastening work extremely easy. In addition, there is no need to excavate a wide area under and around the pipe joint, and the absolute number of bolts and nuts is smaller than in the conventional case (and there is no need to separate the T-bolts and NANDs, and the connecting rods and nuts). Since there are no bolts, it is possible to significantly simplify the work.Furthermore, it is possible to prepare the entire unit as a unit, so there is no need to find bolts and bolts individually, and the amount of expansion and contraction can be reduced. This is convenient because it is only necessary to adjust the threaded state of the connecting rod and the nut.Furthermore, the flange part does not have slits or the like to ensure movement of the connecting rod in the radial and axial directions. (The structure is made of a single plate, and it is possible to ensure sufficient strength.

[Brief explanation of drawings]

Figures 1 to 10 relate to the present invention; Figure 1 is an overall perspective view of a pipe detachment prevention device when applied to a water pipe, Figure 2 is an exploded perspective view thereof, and Figure 3 is a flange. 4 is a plan view of the flange section, FIG. 5 is a half sectional view taken in a direction perpendicular to the tube axis, and FIG. 6 is a partial cross-sectional view of the flange section. FIG. 7 is a perspective view showing the flange portion of the fitting, FIG. 8 is a perspective view showing another embodiment of the fastening member, FIG. 9 is an exploded perspective view showing the other fitting, and FIG. 101! 1 is a perspective view showing the pipe detachment prevention device in a ready state, FIG. 11 is an overall perspective view when the conventional pipe detachment prevention device is applied to a water pipe, and FIG. 12 is an exploded perspective view of the same.

Claims (1)

[Claims] 1. Two types of pipe detachment prevention fittings divided into a plurality of pieces that are tightened on the outer peripheral surface of the pipes at the joint part where the pipes are connected in a flexible and expandable manner, The tube detachment prevention fitting has a protruding piece that protrudes toward the flange portion of the other adjacent split piece at the tip of the flange formed at both ends of each split piece metal fitting, and one of the opposing flange parts. A T-bolt insertion hole is formed on one side, a long hole into which the head of the T-bolt can be inserted and a seating part for the head are formed on the other side, and one tube and the other are formed between the opposing flanges and the protruding pieces. An insertion space for a connecting rod is formed to connect the two pipes, and the other side pipe detachment prevention fitting is connected to the flange portion of the other split piece fitting adjacent to the flange portion formed at both ends of each split piece fitting. 1. A tube detachment prevention device for a pipe joint, characterized in that the flange portion has a mating surface that abuts against the flange portion, and a through hole for inserting the connecting rod is bored approximately in the center of each flange portion.