JP6799659B2 - How to install pipe fittings - Google Patents

Description

The present invention relates to a method of installing a pipe joint that connects a first fluid pipe and a second fluid pipe in a sealed manner.

Conventionally, as a method of installing a pipe joint that connects a first fluid pipe and a second fluid pipe in a sealed manner, an intermediate body (main body) that is externally fitted across the first fluid pipe and the second fluid pipe. A pipe joint including a part), a seal part (elastic member) that seals between the intermediate part and the fluid pipe, and an auxiliary flange part (pressing member) that presses the seal part. In some cases, flanges provided at both ends of the intermediate body are welded to a fluid pipe, seal bodies are arranged on both sides of the intermediate body, and the seal body is pressed by an attached flange body. .. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 11-351491 (page 3, FIG. 1, FIG. 2, FIG. 3)

However, in Patent Document 1, since the flanges provided at both ends of the intermediate body are welded to the fluid pipe, the fluid pipe is deformed by welding the flanges, and the seal body adheres to the fluid pipe. Is uneven, and there is a problem that the sealing function cannot be fully exerted.

The present invention has been made in view of such problems, and an object of the present invention is to provide a method for installing a pipe joint capable of reliably maintaining a sealing function between a first fluid pipe and a second fluid pipe. To do.

In order to solve the above problems, the method of installing a pipe joint of the present invention
It is a method of installing a pipe joint that connects the first fluid pipe and the second fluid pipe in a sealed manner.
A pressing member integrally formed in an annular shape and an elastic member integrally formed are attached to the outer peripheral portions of the first fluid pipe and the second fluid pipe, respectively.
The main body, which is divided into at least two parts in the circumferential direction, is fitted so as to straddle the first fluid pipe and the second fluid pipe.
It is characterized by comprising a first shape adjusting step of pressing the elastic member against the main body portion by the pressing member to press the elastic member against the fluid pipe and adjusting the shape of the fluid pipe. There is.
According to this feature, by adjusting the shape of the fluid pipe, the elastic member can be evenly adhered to the fluid pipe, the sealing function can be enhanced, and the resistance when the fluid pipe and the pipe joint are relatively displaced can be increased. It can be made smaller.

The method of installing a pipe joint of the present invention
The pressing member is characterized in that it is fitted and inserted into the outer peripheral portion of each of the fluid pipes through a gap between the first fluid pipe and the second fluid pipe.
According to this feature, the pressing member formed in an integrally annular shape can be easily inserted into the outer peripheral portion of each of the fluid pipes by utilizing the gap between the first fluid pipe and the second fluid pipe.

The method of installing a pipe joint of the present invention
A gap adjusting step of cutting at least one of the first fluid pipe and the end portion of the second fluid pipe in the pipe axial direction to adjust the gap between the first fluid pipe and the second fluid pipe. It is characterized by having.
According to this feature, since the gap between the first fluid pipe and the second fluid pipe in the pipe axis direction is adjusted according to the thickness of the pressing member, a wide and highly rigid pressing member is attached to the fluid pipe. It can be fitted and the shape of the fluid pipe can be adjusted according to the pressing member.

The method of installing a pipe joint of the present invention
It is characterized by having a second shape adjusting step of attaching an adjusting member to the outer peripheral portion of the end portion of the first fluid pipe and the second fluid pipe in the pipe axial direction and adjusting the shape of the fluid pipe. ..
According to this feature, not only the shape of the fluid pipe can be adjusted so as to follow the shape of the adjusting member of the fluid pipe, but also the fluid pipe can be prevented from being pulled out from the pipe joint.

The method of installing a pipe joint of the present invention
A pressing support means that presses and supports the first fluid pipe and the inner peripheral portion of the end portion of the second fluid pipe in the tube axial direction in a sealed manner is attached, and the shape of the fluid pipe is formed by the pressing and supporting means. It is characterized by including a third shape adjusting step for adjusting.
According to this feature, since the inner peripheral portion of the end portion of the fluid pipe can be pressed and supported by the pressing support means, not only the shape of the fluid pipe can be easily adjusted, but also the fluid pipe can be provided together with the first shape adjusting step. Since the shape can be adjusted along the direction of the pipe axis, the expansion and contraction flexibility of the fluid pipe can be increased.

It is a figure which shows the structure of the water pipe bridge to which the telescopic flexible pipe joint which concerns on Example 1 is applied. The left half of (a) is a front view of a telescopic flexible pipe joint, the right half of (a) is a sectional view of BB of (b), and the upper half of (b) is a sectional view of AA of (a). The lower half of (b) is a side view. (A) is a sectional view taken along the line CC of FIG. 2A, and FIG. 2B is a sectional view taken along the line AA of FIG. 2A. (A) is a diagram showing an attached state of the existing expansion pipe joint, and (b) is a diagram showing a situation in which the existing expansion pipe joint is removed and the end portion of the fluid pipe is cut. (A) is a view showing a state in which a push ring and a sealing member of a telescopic flexible pipe joint are attached to an outer peripheral portion of a fluid pipe, and (b) is a detailed view of (a). It is a figure which shows the state which attached the adjusting member to the end of the fluid pipe. (A) is a diagram showing a situation in which the main body of a telescopic flexible pipe joint is attached to a fluid pipe, and (b) is a detailed view of (a). (A) is a diagram showing a state in which the main body of the telescopic flexible pipe joint is attached to the fluid pipe, and (b) is a diagram showing a deformation state of the fluid pipe. It is a figure which shows the state which the push ring is attached to the main body part of the telescopic flexible pipe joint. (A) is a diagram showing the state of the water pressure test after the expansion and contraction flexible pipe joint installation is completed, and (b) is a detailed diagram of (a). (A) is a partial front sectional view of the pressing support means for the water pressure test, and (b) is a side sectional view. (A) is a partial side sectional view of the telescopic flexible pipe joint according to the second embodiment, and (b) is a detailed view of (a). Is a diagram illustrating another application example of the telescopic flexible pipe joint.

A mode for carrying out the method for installing a pipe joint according to the present invention will be described below based on examples.

The pipe joint according to the present invention will be described with reference to FIGS. 1 to 11. Hereinafter, an example in which the pipe joint according to the present invention is applied to a telescopic flexible pipe joint that connects both ends of an aqueduct bridge erected in a river and a buried pipe buried in an abutment will be described. As shown in FIG. 1, the fluid pipe 10 is hermetically connected to the fluid pipe 11 erected in a river 2 or the like via telescopic flexible pipe joints 20, 20', and is connected to the abutment 4, It is composed of fluid pipes 12 and 13 embedded in 5. Both ends of the erected fluid pipe 11 are supported by piers 4 and 5, and the intermediate portion thereof is supported by piers 6 and 7, and the piers 4, 5, 6 and 7 are fixed to underground 3 respectively. ing. In FIG. 1, the fluid pipe 11 is integrally formed, but the divided fluid pipes are joined by flange coupling, socket insertion joint, mechanical joint using a push ring, welding joint, or the like. You may. Further, the pipe joint is not limited to the telescopic flexible pipes 20 and 20', and may be a telescopic pipe.

In FIG. 1, the erected fluid pipe 11 is fixedly supported by ring supports 9, 9, 8 and 9 provided on the abutments 4, 5, 6 and 7. Here, the ring support 8 is fixed to the abutment 6, the ring support 8 is fixed to the fluid pipe 11, and the abutment 6, the ring support, and the fluid pipe are integrally fixed. On the other hand, the ring support 9 has a structure that can be moved with respect to the piers 4, 5, and 7 as described later, and the expansion and contraction that occurs between the erected fluid pipe 11 and the piers 4, 5, 6, and 7 and the like. It is possible to absorb the external force due to the relative movement of. Further, there is almost no relative displacement between the buried fluid pipes 12 and 13 and the abutments 4 and 5. Therefore, the telescopic flexible pipe joints 20 and 20'are provided between the fluid pipe 11 that moves relative to the abutments 4 and 5 and the fluid pipes 12 and 13 that do not move relative to the abutments 4 and 5. It functions to absorb external forces due to relative movement such as expansion and contraction, bending, and twisting that occur between the 11 and the fluid pipes 12 and 13.

The fluid tube 10 is made of stainless steel, steel, ductile cast iron, or the like, and is rust-proofed by rubber lining, plastic coating, epoxy resin coating, powder coating, or the like, if necessary. In this embodiment, the fluid in the fluid pipe is water such as agricultural water, but the fluid flowing inside the fluid pipe is not necessarily limited to agricultural water, for example, industrial water, tap water, sewage, and other gases. It may be a gas-liquid mixture of gas and liquid.

Next, the telescopic flexible pipe joints 20 and 20'as the pipe joint according to the present invention will be described. Since the telescopic flexible pipe joints 20 and 20'have the same structure, the telescopic flexible pipe joint 20 will be described in detail below.

As shown in FIGS. 2A and 2B, the telescopic flexible pipe joint 20 is externally fitted across the fluid pipe 11 as the first fluid pipe and the fluid pipe 12 as the second fluid pipe. The sealing members 22 and 22 as elastic members that seal between the main body 21 and the main body 21 and the fluid pipe 11 and the fluid pipe 12, and the push rings 23 and 23 as pressing members that press the sealing members 22 and 22. Mainly prepared. Hereinafter, the members constituting the telescopic flexible pipe joint 20 will be described.

As shown in FIG. 2, the main body 21 is a tubular body that is externally fitted across the fluid pipe 11 and the fluid pipe 12. The main body portion 21 is composed of a main body dividing portion 21a and a main body dividing portion 21b that are divided into two in the circumferential direction, and extends in the pipe axis direction at the peripheral end portions of the main body dividing portion 21a and the main body dividing portion 21b. Flange 21c, 21c, 21d, 21d are provided, and the main body dividing portion 21a and the main body dividing portion 21b are integrally formed into a tubular shape by bolts, nuts 25, 25, ... Through packing 27 (see FIG. 3A). Flange-coupled. The main body 21 is made of steel, stainless steel, cast iron, cast steel, etc., and is rust-proofed by rubber lining, plastic coating, epoxy resin coating, powder coating, or the like, if necessary. Further, the main body 21 may have a structure divided into three or more.

Further, as shown in FIG. 3, both ends of the main body dividing portion 21a located on the upper side of the main body portion 21 and the main body dividing portion 21b located on the lower side in the pipe axial direction are thickened inward in the radial direction. The formed accommodating portions 21h, 21h, ... Are formed, and on the surface of the accommodating portions 21h, 21h, ... Facing the fluid pipes 11 and 12, an inclined wall whose diameter is reduced toward the center of the main body portion 21 in the pipe axial direction. 21j, 21j, ... Are formed, and projecting walls 21m, 21m, ... Protruding radially inward from the inclined walls 21j, 21j, ... Are formed all around the center of the main body 21 of the inclined walls 21j, 21j. It is formed over.

Further, flanges 21f, 21f, ... Are provided at both ends of the main body dividing portion 21a and the main body dividing portion 21b in the pipe axial direction toward the outer side in the radial direction. Bolt insertion holes 21k, 21k, ... Are formed in the flanges 21f, 21f, .... In addition, a high-pressure socket 21n for introducing test water during a water pressure test is provided at the central portion of the main body 21 in the pipe axial direction.

Next, the push wheels 23 and 23 will be described. The push wheels 23 and 23 are integrally formed in an annular shape, are arranged at both ends of the main body 21, and are externally inserted into the fluid pipe 11 and the fluid pipe 12. As shown in FIGS. 2 and 3, since each of the push wheels 23 and 23 has the same structure, one push ring 23 will be described.

The push ring 23 is formed in a substantially disk shape having a hole portion 23b formed in an inner diameter portion having a diameter slightly larger than the outer diameter of the fluid pipes 11 and 12, and a main body portion 21 is formed on the outer peripheral side of the push ring 23. Bolt insertion holes 23c, 23c, ... Are formed at positions facing the bolt insertion holes 21k, 21k. Further, an annular protrusion 23a is formed on one end surface of the push ring 23 in the pipe axial direction, and a pressing surface 23d for pressing the sealing member 22, which will be described later, is formed on the axial end of the annular protrusion 23a. ..

Next, the sealing members 22 and 22 will be described. As shown in FIGS. 2 and 3, since the sealing members 22 and 22 also have the same structure, one of the sealing members 22 will be described. The sealing member 22 is made of an elastic member such as rubber or plastic, and is integrally formed in an endless shape. The sealing member 22 is formed on a cylindrical surface so that its inner peripheral surface 22a is in close contact with the outer peripheral portion 11a of the fluid pipe 11 in a tightened state, and the outer peripheral surface 22j is an inclination of the accommodating portion 21h of the main body portion 21. It has a cylindrical surface that is inclined in the pipe axis direction so as to be in close contact with the wall 21j, and the end portion in the pipe axis direction is covered so as to be in close contact with the pressing surface 23d of the annular protrusion 23a of the push ring 23. The pressing surface 22d is formed. It is preferable that the cross section of the sealing member 22 has a shape like a K-shaped rubber ring having a substantially K shape.

The sealing member 22 configured in this way is housed in a region surrounded by the inclined wall 21j and the protruding wall 21m of the housing portion 21h of the main body portion 21 and the outer peripheral portion 11a of the fluid pipe 11, and is covered with the sealing member 22. When the pressing surface 22d is pressed by the pressing surface 23d of the pressing ring 23, the inner peripheral surface 22a of the sealing member 22 strongly adheres to the outer peripheral portion 11a of the fluid pipe 11 due to the wedge effect of the inclined wall 21j, and exerts a sealing function.

Since the cross-sectional shape of the inclined wall 21j of the accommodating portion 21h is formed to be substantially circular, for example, when the fluid pipe 11 is deformed into an elliptical shape, the outer peripheral portion 11a of the fluid pipe 11 and the accommodating portion 21h The distance from the inclined wall 21j is narrow in the long axis direction and wide in the short axis direction of the fluid pipe. Therefore, the force of the sealing member 22 pressing the fluid pipe 11 is large in the long axis direction and small in the short axis direction of the fluid pipe, so that the force of the sealing member 22 pressing the fluid pipe 11 becomes non-uniform, and the sealing function May affect the soundness of the.

Therefore, as will be described in the installation process of the telescopic flexible pipe joint 20 described later, the telescopic flexible pipe joint 20 utilizes the pressing force when the sealing members 22 and 22 press the fluid pipes 11 and 12. The shapes of the fluid pipes 11 and 12 are adjusted. Here, the reaction force when the sealing members 22 and 22 press the fluid pipes 11 and 12 separates the flanges 21f and 21f of the main body dividing portion 21a from the flanges 21g and 21g (FIG. 2) of the main body dividing portion 21b. Acts like. However, since the flanges 21f and 21f of the main body dividing portion 21a and the push wheels 23 and 23 arranged close to the flanges 21g and 21g of the main body dividing portion 21b are integrally formed in an annular shape and have high rigidity, the flange of the main body dividing portion 21a Since the separation between the 21f and 21f and the flanges 21g and 21g of the main body dividing portion 21b is prevented, the cross-sectional shape of the fluid pipes 11 and 12 is adjusted to follow the substantially circular shape of the push rings 23 and 23.

Hereinafter, as an example of changing an existing expansion joint to a pipe joint having earthquake resistance in order to absorb expansion and contraction due to temperature, the existing expansion pipe joint 60 is replaced with the expansion and contraction flexible pipe joint 20 according to the present invention. The process of exchanging with will be described. Since the telescopic flexible pipe joints 20 arranged on both sides of the fluid pipe 11 have the same configuration, the existing telescopic pipe joint 60 connecting the fluid pipe 11 and the fluid pipe 12 is replaced with the telescopic flexible pipe joint 20. The steps to be performed will be described with reference to FIGS. 4 to 12.

In FIG. 4A, the fluid pipe 11 is integrally fixed to the ring support 9. Further, the ring support 9 has a support portion 9a and a leg portion 9b that directly hold the fluid pipe 11, and the leg portion 9b is placed on a leg plate 9c laid on the abutment 4, and the leg portion 9b is a fluid pipe. It is possible to move relative to the leg plate 9c with displacement such as expansion and contraction of 11.

First, the bolts and nuts for tightening the existing expansion joint 60 are removed, and the main body is blown and removed. The removal method is not limited to fusing, and if the main body is a split type, the split may be removed. Then, as a gap adjusting step, as shown in FIG. 4B, the gap 15a in the pipe axial direction between the fluid pipe 11 and the fluid pipe 12 is adjusted. In the gap adjusting step, a part 12a of the fluid pipe 12 is cut and removed so that the gap 15a of the existing expansion pipe joint 60 satisfies the minimum gap required for seismic design. After completing the gap adjustment process, the surface of the fluid pipe is rust-removed and surface-treated. The cutting includes, for example, gas cutting, cutting with a cutting tool such as a tool bit or a band saw, and machining such as grinding with a grinder or the like.

As shown in FIGS. 5A and 5B, the gap dimension S1 of the gap 15b after adjusting the gap 15a between the fluid pipe 11 and the fluid pipe 12 (see FIG. 4B) is relatively large. The maximum width dimension S2 of the push ring 23 and the maximum width dimension S3 of the sealing member 22 can also be increased by using the gap dimension S1, and the push ring 23 having high rigidity formed integrally without having a divided structure is used. be able to. If the gap 15a has a sufficient distance from the beginning, it is not necessary to cut the fluid pipe 12 as described above. On the contrary, when the push ring 23 and the sealing member 22 cannot pass through the gap 15b after the gap adjusting step, the push ring 23, 23 and the sealing member 22, 22 which are divided and configured as necessary are used.

Next, as shown in FIG. 6, the adjusting member 26 is attached to the outer peripheral side of the axial end of the fluid pipes 11 and 12. The adjusting member 26 is attached to the outer periphery of the fluid pipes 11 and 12 at four locations at equal intervals, and functions to prevent the fluid pipes 11 and 12 from being pulled out from the telescopic flexible pipe joint 20 due to the behavior during an earthquake. Further, when the deformation of the fluid pipes 11 and 12 usually occurs at the end of a thin-walled pipe having a large diameter or is large in the cutting step, the circumference 1 of the fluid pipes 11 and 12 is used as the second shape adjustment step. It is also possible to adjust the shape of the fluid pipe by welding the adjusting member 26 having a length of about / 4 to 1/2 to the outer circumferences of the fluid pipes 11 and 12. After welding, the adjusting member 26 is welded and then subjected to rust prevention treatment.

Next, as shown in FIG. 7, the main body 21 is attached. First, while suspending the main body dividing portion 21b with a wire or the like (not shown), the main body dividing portion 21b is rotated along the fluid pipes 11 and 12, and the main body dividing portion 21b is temporarily placed on the sleepers 61 installed on the abutment. To do. Subsequently, the main body dividing portion 21a is hung by a wire or the like (not shown) and covered over the upper portions of the fluid pipes 11 and 12.

Subsequently, as shown in FIG. 8A, the flanges 21c, 21c, 21d, 21d are tightened with bolts, nuts 25, 25, ..., And the main body 21 is integrally assembled in an annular shape. At this time, the gap between the outer peripheral portions of the fluid pipes 11 and 12 and the inner peripheral portions 21p and 21p (see FIG. 3B) of the protruding wall 21m of the main body portion 21 is confirmed by a feeler gauge or the like. The deformed state of the fluid pipes 11 and 12 can be confirmed by checking the gaps at several points in the circumferential direction of the fluid pipes 11 and 12 (see FIG. 8B). At this time, if the difference between the gaps δ1 and δ3 and δ2 and δ4 is large, the position of the main body 21 is adjusted in the vertical and horizontal directions using a hydraulic jack or the like, and the gaps δ1 and δ3 and δ2 and δ4 are almost the same. It is desirable to adjust so that the center of the pipe axis of the fluid tubes 11 and 12 and the center of the axis of the inner peripheral portions 21p and 21p are substantially the same.

Next, in order to reduce the frictional resistance when the sealing member 22 slides on the fluid pipes 11 and 12, a lubricant is applied between both ends of the main body 21 and the sealing members 22 and 22. Then, as shown in FIG. 9, the flanges 21f, 21f, 21g, 21g of the main body 21 and the push wheels 23, 23 are tightened by bolts, nuts 24, 24, ..., And the sealing member 22 is tightened by the main body 21. Lightly contact the inclined walls 21j and 21j. Then, as the first shape adjustment step, priority is given to the bolts / nuts 24, 24, ... Arranged in the narrow portion (long axis direction of the fluid pipe) of the gaps δ1, δ3 and δ2, δ4 confirmed in the previous step. Narrow down. The shapes of the fluid pipes 11 and 12 can be easily adjusted by preferentially narrowing down the bolts and nuts 24, 24, ... Arranged in the narrow gap. Further, when the shapes of the fluid pipes 11 and 12 are adjusted, the bolts, nuts 24, 24, ... Are added until the distance between the flanges 21f, 21f, 21g, 21g of the main body 21 and the push wheels 23, 23 becomes a predetermined amount. Tighten evenly. Since the shapes of the fluid pipes 11 and 12 are adjusted, it is possible to reduce the variation in the tightening force when tightening the bolts / nuts 24, 24, ....

Next, a water pressure test is performed in order to confirm the tightness of the installation of the telescopic flexible pipe joint 20. As shown in FIG. 10, a pressure support means 50 that presses and supports the fluid pipes 11 and 12 in a sealed manner across the inner peripheral portion of the end portion in the pipe axial direction is attached, and the telescopic flexible pipe joint 20 and the fluid pipe 11 are attached. , 12 and the space Cv surrounded by the pressing support means 50 are injected with water through the high pressure socket 21n, and a test pressure is applied for a predetermined time to perform a water pressure test.

Here, the configuration of the pressing support means 50 will be described. As shown in FIG. 11, the pressing support means 50 mainly includes an annular frame 53, a conveying means 52, a seal portion 54, and a plurality of pressing bolts 55. The annular frame 53 has a length in the pipe axial direction that can be arranged so as to straddle the inner peripheral portion of the end portion of the fluid pipes 11 and 12 in the pipe axial direction, and is further divided into a plurality of fan-shaped members 53a, 53a in the circumferential direction. ... Is joined by bolts and nuts 56, 56, ... To form an annular shape. Further, each fan-shaped member 53a is provided with female screw portions 53b and 53b, and pressing bolts 55 and 55 for pressing the seal portion 54 described later are attached. The seal portion 54 is a packing 54a having a length in the pipe axial direction that can be sealed over the inner peripheral portion of the end portion of the fluid pipes 11 and 12 in the pipe axial direction and is integrally formed in an annular shape, and is divided into a plurality of parts in the circumferential direction. It is composed of the pressed pressing plates 54b, 54b, ..., And a plurality of seat plates 54c, 54c, .... The outer peripheral side of the packing 54a is sealed so as to straddle the inner peripheral portion of the end portion of the fluid pipes 11 and 12 in the pipe axial direction, and the inner peripheral portion thereof is formed in an annular shape over the entire circumference. , 54b, ... Is pressed and supported. Further, the inner peripheral portions of the pressing plates 54b, 54b, ... Are supported by the plurality of seat plates 54c, 54c, ..., And the inner peripheral portions of the plurality of seat plates 54c, 54c, ... Are the pressing bolts 55, 55, ... It is pressed and supported by ... The pressing support means 50 configured in this way is carried in a disassembled state from a manhole (not shown) provided in the middle of the fluid pipe 11, assembled in the fluid pipe, and uses the transport means 52, 52. Is transported to the water pressure test position.

Further, as shown in FIGS. 10 (b) and 11 (b), the seal portion 54 of the pressing support means 50 straddles the inner peripheral portion of the end portions of the fluid pipes 11 and 12 in the pipe axial direction, and It is arranged between the two sealing members 22, 22. Further, as a third shape adjusting step, the seal portion 54 of the pressing support means 50 can be directly pressed against the end portion of the fluid pipes 11 and 12 in the pipe axial direction to adjust the shape of the fluid pipes 11 and 12. The shape of the fluid pipes 11 and 12 may be adjusted by the pressing support means 50 alone, but the sealing members 22 and 22 by narrowing down the bolts and nuts 24, 24, ... Of the telescopic flexible pipe joint 20 in the previous process. You may also use the pressing force of.

The hydraulic test is completed and the installation of the telescopic flexible pipe joint 20 is completed. When the pressing bolts 55, 55, ... Of the pressing supporting means 50 are loosened over the entire circumference, the conveying means 52, 52 of the pressing supporting means 50 come into contact with the inner peripheral portions of the fluid pipes 11, 12, and the pressing supporting means The 50 can be freely moved by the transport means 52 and 52. The pressing support means 50 is transported to the vicinity of a manhole (not shown), decomposed into a size that can be carried out, and carried out of the manholes 11 and 12 through the manhole.

Since the shape of the fluid pipe can be adjusted in the telescopic flexible pipe joint 20 configured in this way, the sealing members 22 and 22 can be evenly adhered to the fluid pipes 11 and 12, and the sealing function can be enhanced. .. Further, since the shapes of the fluid pipes 11 and 12 are adjusted, the resistance when the fluid pipes 11 and 12 and the telescopic flexible pipe joint 20 are relatively displaced can be reduced, so that the telescopic flexible pipe joint 20 can be reduced. The reliability of the can be improved.

Next, the telescopic flexible pipe joint 30 according to the second embodiment will be described with reference to FIG. It should be noted that the same configuration as in the above embodiment and overlapping description will be omitted.

As shown in FIGS. 12A and 12B, the telescopic flexible pipe joint 30 has a main body portion 31, a main body portion 31, the fluid pipe 11 and a fluid that are externally fitted across the fluid pipe 11 and the fluid pipe 12. It mainly includes sealing members 32, 32 for sealing between the pipes 12 and push rings 33, 33 for pressing the sealing members 32, 32. The telescopic flexible pipe joint 30 of the second embodiment is different from the telescopic flexible pipe joint 20 of the first embodiment in the mode of pressing the sealing members 32, 32.

The main body portion 31 is divided into two parts, a main body dividing portion 31a and a main body dividing portion 31b, and the main body dividing portion 31a and the main body dividing portion 31b are provided at both ends in the pipe axial direction of the main body dividing portion 31a and the main body dividing portion 31b. Accommodating portions 31h, 31h, ... Formed thickly inward in the radial direction are formed, and the accommodating portions 31h, 31h, ... Are directed toward the center of the main body portion 31 in the pipe axial direction on the surface facing the fluid pipe. Inclined walls 31j, 31j, ... Are formed.

Further, the push ring 33 is formed in an integral disk shape having a hole 33b formed in the inner diameter portion having a diameter slightly larger than the outer diameter of the fluid pipes 11 and 12, and the push ring 33 has a main body portion 31. The inclined walls 33j, 33j are formed at positions facing the inclined walls 31j, 31j, .... Then, since the sealing members 32 and 32 are pressed by utilizing the wedge effect of the two inclined walls 31j and 31j of the main body 31 and the inclined walls 33j and 33j of the push ring 33, the sealing members 32 and 32 are pressed. It adheres strongly to the fluid pipes 11 and 12 and exhibits a sealing function.

Further, the reaction force when the sealing members 32, 32 press the fluid pipes 11 and 12 is shared by the main body portion 31 having a two-divided structure and the push ring 33 integrally formed, and the push ring 33 integrally formed. The cross-sectional shape of the fluid pipes 11 and 12 is adjusted to follow the push rings 33 and 33 so as to be in close contact with the side surface of the main body 31 having the two-divided structure and prevent the main body 31 having the two-divided structure from being deformed.

Although examples of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these examples, and any changes or additions within the scope of the gist of the present invention are included in the present invention. Is done.

The telescopic flexible pipe joints 20 and 30 according to the above embodiment are applied to the connection with the fluid pipes arranged at both ends of the water pipe bridge, but are not limited to this, and are shown in FIG. 13 (a). As described above, the fluid pipe 40 may be cut and used as a pipe joint for connecting the cut fluid pipes 40a and 40b. Further, as shown in FIG. 13B, it may be used as a pipe joint for connecting the fluid pipes 41a and 41b after removing the connecting member such as the air valve 42 attached to the fluid pipe 41. Further, as shown in FIG. 13 (c), the bypass pipe 48 may be installed by the uninterrupted flow method and used as a pipe joint for connecting the fluid pipes 45a and 45b after removing a part of the fluid pipe 45. Often, in this case, it is possible to install in a continuous flow.

11 Fluid pipe (first fluid pipe)
12, 13 fluid pipe (second fluid pipe)
15b Gap 20 Telescopic flexible pipe joint (pipe joint)
21 Main body 22 Sealing member (elastic member)
23 Push ring (pressing member)
26 Adjusting member 30 Telescopic flexible pipe joint (pipe joint)
31 Main body 32 Sealing member (elastic member)
33 Push ring (pressing member)
50 Pressing support means

Claims (4)

It is a method of installing a pipe joint that connects a first fluid pipe that moves relative to the abutment and a second fluid pipe that does not move relative to the abutment in a sealed manner.
A gap adjusting step of cutting at least one of the first fluid pipe and the end portion of the second fluid pipe in the pipe axial direction to adjust the gap between the first fluid pipe and the second fluid pipe. When,
A pressing member integrally formed in an annular shape and an elastic member integrally formed are attached to the outer peripheral portions of the first fluid pipe and the second fluid pipe, respectively.
The main body, which is divided into at least two parts in the circumferential direction, is externally fitted across the first fluid pipe and the second fluid pipe and assembled integrally in an annular shape.
The present invention includes a first shape adjusting step of pressing the elastic member against the main body portion by the pressing member to press the elastic member against the fluid pipe and adjusting the shape of the fluid pipe. How to install the characteristic pipe joint. The pipe joint according to claim 1, wherein the pressing member is fitted into the outer peripheral portion of each of the fluid pipes through a gap between the first fluid pipe and the second fluid pipe. Installation method. The pipe according to claim 1 or 2, further comprising a step of removing an existing pipe joint connecting the first fluid pipe and the second fluid pipe before the gap adjusting step. How to install the fitting. A second shape adjusting step is provided in which an adjusting member is attached to an outer peripheral portion of an end portion of the first fluid pipe and the second fluid pipe in the pipe axial direction to adjust the shape of the fluid pipe. The method for installing a pipe joint according to any one of claims 1 to 3.

Images