JP2020172969A - Expansion/contraction flexible joint structure and aseismatic repair valve - Google Patents

Abstract

To provide an expansion/contraction flexible joint structure and an aseismatic repair valve capable of blocking a flow channel in a state of securing a prescribed installation depth of a fire hydrant or an air valve by being connected between a water pipe and the fire hydrant or the air valve, while suppressing increase of a length in a tangential direction, preventing damage of the fire hydrant and the air valve by exerting expansion/contraction performance in occurrence of earthquake, and exerting superior earthquake resistance by improving strength of an expansion/contraction flexible side.SOLUTION: An expansion/contraction flexible joint structure includes a plug 41 disposed on a piping material 10, a pressing ring 21 fitted to an outer peripheral surface of the plug 41 through a flexible space S in a loosely fitting state, a socket member 22 to which the pressing ring 21 is fixed, a locking projection portion 50 formed on the outer peripheral surface of the plug 41 integrally or separately, a spacer 30 held on an inner periphery of the pressing ring 21, and a rubber ring 31 for keeping sealability between an inner peripheral surface of the socket member 22 and the outer peripheral surface of the plug 41. In an ordinary time, the locking projection portion 50 is held by the spacer 30 in a locked state, and in an expansion/contraction flexible time, the expansion/contraction flexible joint structure is expanded and contracted through the flexible space S in a state of crushing the spacer 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to a telescopic flexible joint structure having seismic resistance and a seismic repair valve having this structure.

Conventionally, for example, a repair valve is provided between a water pipe buried in the ground and a fire hydrant, an air valve, etc., and the fire hydrant or air is blocked by closing the repair valve to block water flow from the water pipe side. Inspection and repair of valves, etc. are possible. As a repair valve of this type, for example, the repair valve 1 shown in FIG. 9A is known. In the figure, a water pipe 2 is buried in the ground in the horizontal direction, and a valve chamber 3 is provided from the ground surface so as to reach the water pipe 2. A T-shaped pipe 5 having a branch portion 4 that branches in the vertical direction is connected to the vicinity of the valve chamber 3, and a repair valve 1 is provided above the branch portion 4. The repair valve 1 includes a short pipe 6 and a valve portion 7, and in a state where these are integrally connected by bolts or the like, a T-shaped pipe 5 is provided on the short pipe 6 side and a fire hydrant (or an air valve) is placed above the valve portion 7. ) 8 is connected. An initial gap G is provided between the repair valve 1 and the chamber wall 3a of the valve chamber 3.
In this case, seismic resistance is required when laying pipes in the ground, and when a fire hydrant 8 or an air valve is branched and provided in the water pipe 2 as described above, a repair valve 1 is provided between them. Also, the joints are required to have earthquake resistance.

As a joint structure having this kind of seismic function, for example, the joint structure of a pipe of Patent Document 1 is disclosed. In the joint structure of this pipe, a lock ring accommodating groove is formed on the inner circumference of the socket on one side of the pipe, and a tapered surface for accommodating the rubber sealing material is formed further on the opening side of the lock ring accommodating groove. Has been done. Further, an insertion protrusion is formed on the outer periphery of the insertion port of the pipe on the other side, and a lock ring is attached to the insertion protrusion in a state of being prevented from coming off. A sealing material is mounted so as to protrude from the opening side at a position separated from the lock ring, and this sealing material is bolted by a flange formed on the pipe on one side and a push ring mounted from the outside of the flange. It is attached via. With such a configuration, when a force in the bending direction is applied to the joint portion, the joint portion bends to exhibit seismic resistance.

On the other hand, the seismic repair valve of Patent Document 2 has been filed by the applicant. This seismic repair valve has an insertion port provided on the primary side of the body, a push ring fitted on the outer peripheral side of the insertion port, a socket member fixed to the push ring, a retaining ring, and a rubber ring. A retaining ring is mounted in the mounting groove provided in the above, and the ridge portion provided in the retaining ring is inserted into the outer peripheral groove formed on the outer peripheral surface of the insertion port with a telescopic flexible space provided. ing. A rubber ring is attached between the inner peripheral surface of the receiving port member and the outer peripheral surface of the insertion port, and the rubber ring ensures watertightness and expands and contracts flexibility.

By the way, when a fire hydrant is installed underground, it is also required by the standard to secure the installation depth. For example, the standard (JWWA B 103) by the Japan Water Works Association (JWWA) stipulates that the cap depth of the fire hydrant in shallow burial should be 150 mm or more.

Japanese Unexamined Patent Publication No. 2003-214573 JP-A-2017-172799

When the repair valve 1 is laid in the state of FIG. 9A, when an earthquake occurs, the ground where the valve chamber 3 is provided and the water pipe 2 are relatively displaced, and due to this relative displacement, FIG. 9B ), There is a possibility that the initial gap G disappears and the fire hydrant (or air valve) 8 comes into contact (collision) with the chamber wall 3a. At this time, the displacements of both are constrained, and when the relative displacement between the ground and the water pipe 2 continues after that, the fire hydrant 8 receives the reaction force F from the chamber wall 3a and tilts, and the deformation accompanying this tilting occurs. Exceeds the limit deformation amount, which leads to damage to the fire hydrant 8, the flange portion of the repair valve 1, and the T-shaped pipe 5.

On the other hand, it is conceivable to connect the branch portion side and the repair valve side by using the joint structure of the pipe of Patent Document 1 to provide flexibility between the branch portion and the repair valve. However, in the joint structure of this pipe, the portion constituting the flexible function becomes longer in the pipe axial direction (connection direction), so that the distance from the repair valve to the water main is longer than before. For this reason, when trying to install this joint structure between the repair valve and the T-shaped pipe while ensuring the predetermined installation depth (cap depth 150 mm) of the underground fire hydrant, the water pipe is buried. As the depth (overburden) increases, the cost of laying increases. Even when an attempt is made to make existing fire hydrants earthquake-resistant by using this joint structure, it is necessary to re-bury the water pipe deeper in order to secure a predetermined cap depth.

On the other hand, in the case of the seismic repair valve of Patent Document 2, it can be installed while suppressing the increase in length in the connection direction as compared with the joint structure of the pipe of Patent Document 1, and the cap depth of the fire hydrant is secured. , It becomes possible to attach to the water pipe without increasing the burial depth of the water pipe.
When an earthquake occurs, the insertion port can be expanded and contracted in the telescopic flexible space to prevent damage to the flange portion of the fire hydrant and the repair valve and the T-shaped pipe. However, since the outer peripheral groove is formed in the insertion port, the wall thickness of the insertion port is thinner than the surrounding portion in the portion of the outer peripheral groove, so that improvement in strength is desired.

The present invention has been developed to solve the conventional problems, and an object of the present invention is to connect a fire hydrant or an air valve to a water pipe while suppressing an increase in length in the connection direction. It can block the flow path while ensuring a predetermined installation depth, exhibits telescopic flexibility in the event of an earthquake, prevents damage to fire hydrants and air valves, and improves the strength of the telescopic flexible side. The purpose is to provide telescopic flexible joint structures and seismic repair valves that exhibit seismic resistance.

In order to achieve the above object, the invention according to claim 1 comprises an insertion port provided in the piping equipment, a push ring fitted in a loosely fitted state on the outer peripheral surface of the insertion port through a flexible space, and the push ring. The socket member to which the socket is fixed, the locking ridge portion formed integrally or separately on the outer peripheral surface of the insertion port, the spacer held on the inner circumference of the push ring, the inner peripheral surface of the socket member, and the insertion. It is equipped with a rubber ring to maintain the sealing property with the outer peripheral surface of the mouth, and the locking ridge is held in the spacer in the locked state in normal times, and it is flexible in the state where the spacer is crushed when it is stretchable and flexible. It is a telescopic flexible joint structure that expands and contracts through a space.

The invention according to claim 2 is an insertion port provided in a body for a repair valve, a push ring fitted in a loosely fitted state on the outer peripheral surface of the insertion port via a flexible space, and a receiving port to which the push ring is fixed. A member, a locking ridge formed integrally or separately on the outer peripheral surface of the insertion port, a spacer held on the inner circumference of the push ring, and an inner peripheral surface of the receiving member and an outer peripheral surface of the insertion port. It is equipped with a rubber ring to maintain the sealing property between them, and the locking ridge is held in a locked state by the spacer in normal times, and when it is stretchable and flexible, it can be expanded and contracted through the flexible space with the spacer crushed. It is a flexible seismic repair valve.

In the invention according to claim 3, a retaining ring is mounted in a mounting groove composed of a push ring and / or a receiving member, and a spacer held on the inner circumference of the retaining ring is integrally or separately at the insertion port. It is a telescopic flexible joint structure and seismic repair valve that holds the formed locking ridges in a locked state.

The invention according to claim 4 is a telescopic flexible joint structure and a seismic repair valve in which a rubber ring is pressed by a retaining ring or a push ring when the body is in a stretchable flexible state.

The invention according to claim 5 is a telescopic flexible joint structure and a seismic repair valve in which a backup ring is interposed between a retaining ring or push ring and a rubber ring.

According to the invention of claim 1 or 2, a locking ridge is formed at the insertion port, and in normal times, the locking ridge is locked and held by a spacer held on the inner circumference of the push ring. It can be used while suppressing the increase in length in the connection direction due to the configuration in which the locking ridge can be expanded and contracted while the spacer is crushed during expansion and contraction. Therefore, for example, it can be used by connecting it between a water pipe and a fire hydrant or an air valve. In that case, the flow without increasing the burial depth of the water pipe while securing a predetermined installation depth of the fire hydrant or the air valve. The road can be blocked. In normal times, the locking ridge is held by the spacer in a locked state to prevent tilting and movement of the insertion port side and maintain a stable upright state. On the other hand, when a fire hydrant or an air valve comes into contact with the chamber wall of the valve chamber when an earthquake occurs, the locking ridge portion exhibits telescopic flexibility through the flexible space in a state where the spacer is crushed. As a result, the insertion port side expands and contracts flexibly in the flexible space without plastic deformation, preventing damage to the flange of the fire hydrant and air valve and parts connected to the primary side, while maintaining watertightness with the rubber ring. Prevent leaks. At this time, by forming a locking ridge portion integrally or separately on the outer peripheral surface of the insertion port, it is possible to prevent local thinning of the insertion port on the stretchable and flexible side and improve the strength. As a result, excellent seismic resistance is exhibited, and it becomes easy to process the locking ridge portion for the insertion port. At the time of assembly, the push ring is fitted loosely on the outer peripheral surface of the insertion port and can be fixed to the receiving port member while the spacer is held in advance on the push ring, so that assembly and disassembly are easy and maintenance and repair are easy. It will be feasible. It can also be connected to various pipes other than between the water pipe and the fire hydrant or air valve. In this case, it can be easily connected as a part of the pipe regardless of whether it is an existing pipe or a new pipe. It can be demonstrated to improve seismic resistance.

According to the invention of claim 3, the upright state of the insertion port side is maintained in normal times, and when a strong force is applied to the insertion port side, damage can be prevented by expanding and contracting the insertion port while preventing the insertion port from coming off. .. By mounting a retaining ring in the mounting groove composed of the push ring and / or the receiving member and holding the spacer on the inner circumference of the retaining ring, these spacers and the retaining ring can be attached to the push ring in advance. It can be assembled by easily fitting the insertion slot into the push ring.

According to the invention of claim 4, when the body is in the stretchable and flexible state, the rubber ring is pressed by the retaining ring or the push ring, so that a separate part for pressing the rubber ring is not required. The compactness of the rubber ring can be maintained, the rubber ring is elastically deformed within a predetermined area to absorb the impact when the insertion port is tilted, and the gap between the receiving member and the insertion port is maintained in a sealed state to reliably prevent leakage.

According to the fifth aspect of the present invention, the retaining ring or push ring and the backup ring provided between the rubber ring can prevent the deformed portion of the rubber ring from sticking out or coming out, and prevent the rubber ring from being excessively deformed. ..

It is a vertical cross-sectional view which shows the 1st Embodiment which applied the telescopic flexible joint structure of this invention to a seismic repair valve. It is an enlarged sectional view of the main part of FIG. (A) is a cross-sectional view showing a state in normal times. (B) is a cross-sectional view showing a state at the time of expansion and contraction flexion. FIG. 3 is a vertical cross-sectional view showing a state in which an excessive pull-out force is applied to the seismic repair valve of FIG. It is a vertical sectional view which shows the 2nd Embodiment of the seismic repair valve. (A) is a cross-sectional view showing a state in normal times. (B) is a cross-sectional view showing a state at the time of expansion and contraction flexion. It is a vertical sectional view which shows the 3rd Embodiment of the seismic repair valve. (A) is a cross-sectional view showing a state in normal times. (B) is a cross-sectional view showing a state at the time of expansion and contraction flexion. It is a vertical cross-sectional view which shows the 4th Embodiment of the seismic repair valve. (A) is a cross-sectional view showing a state in normal times. (B) is a cross-sectional view showing a state at the time of expansion and contraction flexion. It is a vertical sectional view which shows the 5th Embodiment of the seismic repair valve. (A) is a cross-sectional view showing a state in normal times. (B) is a cross-sectional view showing a state at the time of expansion and contraction flexion. It is a vertical cross-sectional view which shows the embodiment which applied the telescopic flexible joint structure of this invention to a short pipe. It is explanatory drawing which shows the piping state of the conventional repair valve. (A) is a figure which shows the normal state of the conventional underground fire hydrant. (B) is a figure explaining a situation where an underground fire hydrant collides with a chamber wall of a valve chamber.

Hereinafter, the telescopic flexible joint structure of the present invention will be described in detail based on the embodiment. The telescopic flexible joint structure of the present invention can be applied to various piping equipments, but in this example, an example of application to seismic repair valves as piping equipment will be described. FIG. 1 shows a first embodiment of a seismic repair valve, and FIG. 2 shows an enlarged cross-sectional view of a main part of FIG.

In FIG. 1, the seismic repair valve (hereinafter referred to as valve body 10) is provided between the T-shaped pipe 11 and the fire hydrant (or air valve) 12. The T-shaped pipe 11 is arranged on the primary side of the valve main body 10 and has a branch portion 14 vertically branched from a water pipe (not shown) buried in the ground. The fire hydrant 12 is arranged on the secondary side of the valve body 10, and a fire extinguishing hose (not shown) is connected to the fire hydrant 12. The valve body 10 is provided so that the flow path between the water pipe (T-shaped pipe 11) and the fire hydrant 12 can be opened and closed, and by closing the valve body 10, the water pressure on the water pipe side can be shut off, and the fire hydrant 12 It is possible to carry out inspections and repairs.

The valve body 10 includes a ball valve 20, a push ring 21, and a receiving member 22, and a spacer 30, a rubber ring 31, a retaining ring 32, and a backup ring 33 are provided between them.

The ball valve 20 has a body 40 for a repair valve, an insertion port 41 is formed on the primary side of the body 40, and a flange portion 42 is formed on the secondary side, and the secondary side of the valve body 10 is formed via the flange portion 42. A fire hydrant 12 is connected to the side.

A ball 43, a stem 44, and a ball seat 45 are mounted in the body 40 of the ball valve 20. The ball 43 is rotatably housed in the body 40 by the stem 44, and the handle 46 for operation is fixed to the stem 44. Ball sheets 45 are arranged on the primary and secondary sides of the ball 43, respectively, and a valve seat receiver 48 is fixed to the secondary side of the body 40 by screwing. The ball valve 20 can open and close the flow path by operating the handle 46.

The insertion port 41 of the body 40 is formed so as to extend to the primary side of the body 40, and a collar-shaped locking ridge portion 50 is integrally formed at a predetermined position on the outer peripheral surface of the insertion port 41. Has been done. A push ring 21 is loosely fitted to the outer peripheral surface of the insertion port 41 via a flexible space S described later.

The push ring 21 is formed of a metal material in a substantially annular shape, and an insertion hole 51 capable of loosely fitting the outer periphery of the insertion port 41 is provided on the inner circumference thereof. A step portion 52 having a diameter larger than that of the insertion port 41 is formed on the upper portion of the push ring 21, and the flexible space S is provided between the step portion 52 and the insertion port 41. When an excessive force is applied to the body 40 side in a direction intersecting the pipe axis direction, the body 40 can be tilted through the flexible space S. A flange portion 53 is formed on the outer periphery of the push ring 21, and a receiving member 22 described later is connected via the flange portion 53.

An annular mounting groove 54 is formed on the inner circumference of the push ring 21, and the retaining ring 32 is mounted in the mounting groove 54. The retaining ring 32 is formed of a metal material in an annular shape that can be accommodated in the mounting groove 54. The retaining ring 32 has an annular upper protrusion 55 on the upper inner circumference and an annular lower protrusion 56 on the lower inner circumference. Are formed, and according to this configuration, a concave flexible space T is provided on the inner peripheral side of the retaining ring 32. The inner diameter of the upper protrusion 55 is smaller than the outer diameter of the locking ridge 50, and the locking ridge 50 is locked to the upper protrusion 55. The retaining ring 32 is formed in a divided ring shape, and is mounted by combining the split rings in the mounting groove 54.

A spacer 30 is held on the inner circumference of the push ring 21 via a retaining ring 32. The spacer 30 is formed in an annular shape from a metal material or a resin material, and its outer diameter is provided to a size that can be held on the inner peripheral surface of the retaining ring 32. In the vicinity of the central portion of the inner circumference of the spacer 30, a flange portion 57 having an inner diameter smaller than the outer diameter of the locking ridge portion 50 is formed in a circumferential shape or intermittently. The spacer 30 is formed in an annular shape cut at at least one place, and is held by the inner peripheral surface of the retaining ring 32.

The receiving port member 22 is formed of a metal material in an annular shape having substantially the same diameter as the push ring 21, and the push ring 21 is fixed by a bolt 59 via a flange portion 58 formed on the outer peripheral side. An annular accommodating groove 60 is formed on the inner peripheral surface of the receiving port member 22, and the lower side of the retaining ring 32 is provided in the accommodating groove 60 so as to be accommodating. An annular groove portion 61 having a diameter smaller than that of the accommodating groove 60 is formed below the accommodating groove 60, and the rubber ring 31 is housed in the annular groove portion 61. A small-diameter annular portion 62 projecting in the inner diameter direction is formed on the inner peripheral side of the bottom surface below the annular groove portion 61 of the receiving port member 22. A branch portion 14 of the T-shaped pipe 11 is connected to the primary side of the receiving port member 22, and at this time, a contact surface of the gasket is secured between the small-diameter annular portion 62 and the T-shaped pipe 11.

The rubber ring 31 is formed in an annular shape by a rubber material having abundant elasticity, and is mounted between the inner peripheral surface of the annular groove portion 61 of the receiving member 22 and the outer peripheral surface of the insertion port 41, and these are mounted by the rubber ring 31. The sealing property between the inner peripheral surface of the receiving port member 22 and the outer peripheral surface of the insertion port 41 is ensured. The rubber ring 31 is formed in a shape that can secure a sufficient amount of crushing, and even when the insertion port 41 is tilted with respect to the receiving member 22 and the volume of the annular groove portion 61 changes, a state in which the rubber ring 31 is tightly sealed between them is maintained. It is possible to maintain and prevent leakage.

The backup ring 33 is formed in an annular shape by a metal material or a resin material, and is mounted in a state of being interposed between the retaining ring 32 and the rubber ring 31. In this case, the backup ring 33 is provided with an outer diameter that can be mounted in the accommodating groove 60 having a diameter larger than that of the annular groove portion 61, and is pressed by the upper retaining ring 32 when the backup ring 33 is mounted. For this reason, the rubber ring 31 is prevented from being deformed in the pull-out direction, and the deformed portion is prevented from entering the divided portion of the retaining ring 32.

When the valve body 10 is integrated, the push ring 21 is fitted on the outer peripheral surface of the insertion port 41 of the body 40 (ball valve 20), and the spacer 30 is fitted on the locking ridge 50 of the body 40. , The retaining ring 32 is fitted from the outside thereof, and is mounted in the mounting groove 54 of the push ring 21. In this case, the retaining ring 32 is divided and formed, and the spacer 30 is formed in an annular shape cut at at least one place. Therefore, in a state where these are combined from the outside of the locking ridge portion 50, the mounting groove 54 is formed. It can be attached and assembled.

After the retaining ring 32 and the spacer 30 are attached, the upper end of the spacer 30 is restricted by the upper protrusion 55 of the retaining ring 32, and the locking ridge 50 is attached to the lower end of the flange 57 of the spacer 30. The upper surface is locked, and the lower portion of the locking ridge portion 50 is locked to the lower protrusion 56 of the retaining ring 32. Therefore, the retaining ring 32 and the spacer 30 are held in the mounting groove 54 to prevent the retaining ring 32 from coming off from the insertion port 41.

In this state, the backup ring 33 and the rubber ring 31 are fitted into the outer peripheral surface of the insertion port 41 in this order, and these are arranged below the retaining ring 32.

Subsequently, the tip side of the insertion port 41 is inserted into the inner peripheral side of the receiving port member 22, and these are pushed into the receiving port member 22 by a press from the upper part of the body 40, whereby the rubber ring 31 is elastically deformed and the annular groove portion is formed. It is housed in 61, and is fixed to the receiving ring 21 with a bolt 59 in a state where a predetermined pressure is applied. As a result, the valve body 10 in which the insertion port 41 side of the ball valve 20 (body 40) expands and contracts with respect to the push ring 21 and the receiving member 22 side via the flexible space S is configured. In this case, the retaining ring 32 is positioned and held between the mounting groove 54 of the push ring 21 and the accommodating groove 60 of the receiving port member 22, and is mounted in a state where the displacement is prevented.

After assembly, in normal times, the spacer 30 holds the locking ridge portion 50 in the locked state, thereby maintaining the body 40 in the upright state with respect to the push ring 21 and the receiving member 22. At this time, since the spacer 30 is locked to the locking ridge portion 50 while being held on the inner circumference of the retaining ring 32, there is no possibility that the spacer 30 will fall off in the direction of the receiving port member 22. Further, since the rubber ring 31 is pressed by the push ring 21 via the retaining ring 32, there is no risk of water leakage.

On the other hand, when the spacer 30 is stretchable and flexible due to an earthquake or the like, the valve body 10 is stretchable and flexible through the flexible space S in a state where the spacer 30 is crushed by the locking ridge portion 50.
Even when the body 40 is in the stretchable and flexible state, the rubber ring 31 is pressed by the push ring 21 via the retaining ring 32, so that there is no risk of water leakage.

In the above embodiment, the mounting groove 54 and the accommodating groove 60 are formed on the inner circumferences of both the push ring 21 and the receiving port member 22, and the mounting groove or the accommodating groove is formed on the inner circumference of both the push ring 21 and the receiving port member 22. A structure may be formed in which the member 22 is formed on the inner circumference of either one, and the retaining ring 32 is mounted in the mounting groove or the accommodating groove.

Further, although the backup ring 33 is interposed between the retaining ring 32 and the rubber ring 31, the backup ring 33 may be interposed between the push ring 21 and the rubber ring 31.

Although the locking ridge portion 50 is integrally formed on the outer peripheral surface of the insertion port 41, the locking ridge portion 50 may be provided separately from the insertion port 41. In this case, as shown by the broken lines in FIGS. 1 and 2, the locking ridge portion 50 is formed in a ring shape having a substantially L-shaped cross section and divided in the radial direction, and is formed on the outer peripheral surface of the insertion port 41. It can be mounted by combining it with a concave mounting groove.

When the retaining ring 32, the spacer 30, and the separately locking ridge portion described above are separately provided, the number of divisions thereof can be arbitrarily set.

The spacer 30 is locked by the locking ridge 50 to prevent the insertion port 41 from coming off, and is crushed by the locking ridge 50 when an excessive pull-out force is applied to the insertion opening 41 to lock the spacer 30. As long as the state of being locked to the ridge portion 50 can be released, it can be formed into various cross-sectional shapes without being particular about the shape.

Although not shown, an annular rubber cover may be attached between the body 40 and the push ring 21. In this case, by deforming the cover in accordance with an operation such as tilting of the body, it is possible to prevent the intrusion of earth and sand from the gap between the body 40 and the push ring 21.

Next, the operation and operation of the seismic repair valve in the above-described embodiment during normal times and expansion / contraction flexibility will be described in detail.
In normal times, in FIG. 2A, the body 40 is arranged so that the insertion port 41 is in an upright state, and at this time, the upper surface of the locking ridge portion 50 integrally formed with the insertion port 41 is a spacer. The locking ridge 50 locks to the spacer 30 in a state where the bottom surface of the locking ridge 50 is in contact with the bottom surface of the flange portion 57 of 30 and the bottom surface of the locking ridge 50 is in contact with the upper surface of the lower protrusion 56 of the retaining ring 32. .. At this time, the retaining ring 32 is in a state of pressing the rubber ring 31 via the backup ring 33. In this way, the upper side and the lower side of the locking ridge portion 50 are held horizontally by the spacer 30 and the rubber ring 31 along the outer peripheral direction thereof, so that the insertion port 41 (body 40) is in an upright state. Is maintained stable.

Therefore, even when the ball 43 is rotated to the closed position and water pressure is applied to the ball 43 from the water pipe side during maintenance and inspection of the fire hydrant 12, the annular locking ridge portion 50 is an annular spacer 30. The body 40 is prevented from tilting by contacting the body 40 in a pressure equalizing state, and the body 40 is also prevented from coming off from the push wheel 21 by maintaining these locked states.

On the other hand, a relative displacement occurs between the ground and the water pipe due to the occurrence of an earthquake or the like, and the water pipe moves to the left in the state shown in FIG. 8B, and the fire hydrant 12 connected to the valve body 10 is in the valve chamber. In the event of a collision with the chamber wall of the fire hydrant 12, an excessive force is applied to the fire hydrant 12 from the left side, and in FIG. 2B, a force is applied to the valve body 10 to tilt the body to the right side.

At this time, on the tilting side (right side in the drawing), the locking ridge portion 50 presses the inner peripheral side of the retaining ring 32 via the spacer 30, and a compressive force acts. At that time, the retaining ring 32 and the push ring 21, which are rigid materials, prevent the locking ridge 50 from moving in the horizontal direction, and the spacer 30 maintains the locking ridge 50 locked.

In this way, when the position of the locking ridge 50 on the tilting side is restricted and a force is applied to the fire hydrant 12 located above the locking ridge 50 from the left side, the locking ridge on the tilting side is locked. The strip 50 is pressed toward the lower protrusion 56 side of the retaining ring 32. As a result, an excessive force that tries to rotate clockwise is applied to the body 40 with the locking ridge portion 50 on the tilting side as a fulcrum. Therefore, the locking ridge portion 50 on the side where the force is applied by collision (left side in the figure) moves upward in the flexible space T while crushing the flange portion 57 of the spacer 30, and is the upper part of the retaining ring 32. Further movement is restricted when it comes into contact with the protrusion 55. In this way, the valve body 10 expands and contracts and flexes through the flexible space T in a state where the insertion port 41 is prevented from coming off. In this case, the body 40 can be flexed at an inclination of about 4 ° from the upright direction.

As described above, when the body 40 is expanded and contracted and flexed, the locking ridge 50 abuts on the upper protrusion 55 on the side where the force is applied to prevent the body 40 from coming off, so that the insertion port 41 side interferes with the push ring 21. It prevents the body 40 from being damaged without doing anything. When the body 40 is tilted, the rubber ring 31 that secures a sufficient amount of crushing is attached to the annular groove portion 61, so that the insertion port is formed by the elastic deformation of the rubber ring 31 on both the tilting side and the side to which the force is applied. The sealing property between the outer peripheral surface of 41 and the inner peripheral surface of the receiving member 22 is maintained, and water leakage is surely prevented.

On the other hand, in FIG. 3, when an excessive pull-out force that tries to pull out in the vertical direction acts on the valve body 10, a force that tries to rise on the body 40 acts. Therefore, a force in the exit direction is applied to the locking ridge portion 50 over the entire circumference, and the body 40 is perpendicular to the push ring 21 and the receiving member 22 while the locking ridge portion 50 crushes the collar portion 57. It will move in the direction. In this case, the locking ridge portion 50 comes into contact with the upper protrusion 55 of the retaining ring 32, so that the body 40 is further restricted from rising. In this way, the body 40 moves upward through the flexible space T while preventing the body 40 from coming off, thereby preventing damage or the like.

As described above, the valve body 10 using the telescopic flexible joint structure of the present invention includes an insertion port 41, a push ring 21, a receiving port member 22, a locking ridge portion 50, a spacer 30, and a rubber ring 31. The spacer 30 holds the locking ridge 50 in the locked state in normal times, and the locking ridge 50 can be expanded and contracted via the flexible space T in a state where the locking ridge 50 is crushed during expansion and contraction. By flexing, it exhibits excellent earthquake resistance.

In this case, since the locking ridge portion 50 is formed integrally or separately on the outer peripheral surface of the insertion port 41, it is possible to prevent the insertion port 41 from becoming thin and improve its strength, even when an earthquake occurs. While preventing deformation and breakage of the insertion port 41, the sealability with the rubber ring 31 is maintained and the body 40 side is expanded and contracted to improve earthquake resistance.

A retaining ring 32 is mounted between the mounting groove 54 of the push ring 21 and the accommodating groove 60 of the receiving member 22, and the spacer 30 held on the inner circumference of the retaining ring 32 locks the locking ridge portion 50. The retaining ring 32 is housed inside the push ring 21 and the receiving member 22 to prevent the height dimension of the valve body 10 from increasing due to the mounting of the retaining ring 32. There is. As a result, when the fire hydrant 12 (air valve) is connected to the water pipe via the valve body 10, it is possible to prevent the length in the pipe axis direction (connection direction) from being extended, and the burial depth of the water pipe is increased. It is possible to pipe the fire hydrant 12 with the cap depth secured.
Therefore, seismic resistance can be maintained even when the fire hydrant 12 (or air valve) is installed in a shallow layer on the secondary side of the body 40.

Even if the valve body 10 expands and contracts and flexes, the rubber ring 31 is pressed by the push ring 21 via the retaining ring 32, so that the push ring does not require a separate part for pressing the rubber ring 31. By tightening the 21 and the receiving member 22 with the bolt 59, the rubber ring 31 can be firmly pressed by the retaining ring 32 to ensure the sealing property. When the bolt 59 is tightened, the tightening force is regulated by the contact between the facing surfaces of the push ring 21 and the receiving member 22, so that the retaining ring 32 does not excessively compress the rubber ring 31.

4 (a) and 4 (b) show the second embodiment of the seismic repair valve of the present invention. In the following embodiments, the same parts as those of the previous embodiments are represented by the same reference numerals, and the description thereof will be omitted.
In the valve body 70 of this embodiment, the retaining ring 71 is mounted between the push ring 21 and the receiving member 22 in a state where the annular upper protrusion 72 is formed on the upper inner circumference of the retaining ring 71. The backup ring 73 is formed to be thicker than in the case of FIG. 2, and the backup ring 73 is interposed between the retaining ring 71 and the locking ridge portion 50 and the rubber ring 31.

Also in this case, as in the first embodiment described above, even if the body 40 expands and contracts and flexes, the rubber ring 31 is pressed by the push ring 21 via the retaining ring 71. Since the lower portion of the locking ridge portion 50 is in contact with the backup ring 73, it is held in a locked state between the backup ring 73 and the flange portion 57 of the spacer 30. When the body 40 is tilted, the locking ridge portion 50 on the tilted side is in contact with the backup ring 73 to exert the function of a fulcrum.

As described above, the spacer 30 held on the inner circumference of the retaining ring 71 holds the locking ridge portion 50 integrally or separately formed with the insertion port 41 in the locked state, whereby in normal times. A retaining ring having various cross-sectional shapes can be used as long as the valve body 70 is maintained in an upright state, or the spacer 30 is crushed when the valve body 70 is stretchable and flexible to expand and contract the valve body 70.

5 (a) and 5 (b) show a third embodiment of the seismic repair valve of the present invention.
In the valve body 80 of this embodiment, the depth of the mounting groove 82 of the push ring 81 is formed to be shallower than that of the first and second embodiments, and a thin-walled retaining ring 83 is provided in the mounting groove 82. It is mounted with the inner diameter side of the bottom surface in contact with the upper surface of the backup ring 73. The structure is such that the push ring 81 presses the rubber ring 31 via the backup ring 73 even when the body 40 is in a stretchable and flexible state.

Therefore, in this embodiment, it is possible to form a retaining ring 83 having a thickness corresponding to the depth of the mounting groove 82, and even in this case, the same function as that of the second embodiment can be exhibited.

6 (a) and 6 (b) show the fourth embodiment of the seismic repair valve of the present invention.
In the valve body 90 of this embodiment, a mounting groove 92 is formed at a predetermined position on the outer periphery of the insertion port 41 of the body 91, and a separate locking ridge portion 93 is mounted on the mounting groove 92 and integrated. To. The separate locking ridge 93 is formed in a split ring shape that can be mounted in the mounting groove 92 or in an annular shape with at least one cut.

A shallow mounting groove 95 is formed on the inner circumference of the lower portion of the push ring 81, and the spacer 30 is directly held in the mounting groove 95. The separate locking ridge 93 is held in the locked state by the spacer 30. In this way, the spacer 30 provided on the inner circumference of the push ring 81 holds the locking ridge portion 93 in the locked state, whereby the valve body 90 is maintained in the upright state in normal times, and the spacer 30 is stretched and flexed. Is crushed and stretchable and flexible.

In this case, even when the body 91 is in a stretchable and flexible state, the push ring 81 presses the rubber ring 31 via the backup ring 73. The lower part of the locking ridge portion 93 abuts on the backup ring 73, and the locking ridge portion 93 is held in a locked state between the backup ring 73 and the flange portion 57 of the spacer 30, and when the body 91 is tilted, The locking ridge 93 on the tilting side exerts the function of a fulcrum.

7 (a) and 7 (b) show a fifth embodiment of the seismic repair valve of the present invention.
In the valve body 100 of this embodiment, a mounting groove 92 is formed on the outer periphery of the insertion port 41 of the body 91 as in FIG. 6, and a separate locking ridge portion 93 is mounted on the mounting groove 92.
On the other hand, a mounting groove 102 is formed on the lower inner circumference of the push ring 101, and the spacer 30 is held in the mounting groove 102. In this case, the push ring 101 is configured to project toward the inner diameter side with respect to the upper surface side of the rubber ring 31 as compared with FIG. 6, thereby increasing the pressing area of the bottom surface of the push ring 101 against the upper surface of the rubber ring 31. Therefore, the rubber ring 31 can be pressed more stably.

Also in the second, third, fourth, and fifth embodiments, since the locking ridges 50 and 93 are formed integrally or separately on the outer peripheral surface of the insertion port 41, the thickness of the insertion port 41 is reduced. It is possible to improve the strength by preventing the above, and while preventing the insertion port 41 from being deformed or damaged even in the event of an earthquake, the sealability with the rubber ring 31 is maintained and the bodies 40 and 91 are stretchable and flexible to withstand earthquakes. Improves sex.

FIG. 8 shows an example of piping of the telescopic flexible joint structure of the present invention, and shows a form in which the telescopic flexible joint structure is applied to piping equipment composed of a short pipe 130.
A water pipe (not shown) is buried in the ground in the horizontal direction, and the water pipe is vertically branched by a branch portion 14 of the T-shaped pipe 11. A short pipe 130 is connected to the branch portion 14 via a telescopic flexible joint structure, and a fire hydrant 12 (or an air valve) is connected to the secondary side of the short pipe.

Also in this case, as in the case of the seismic repair valve described above, in normal times, the locking ridge portion 132 provided on the outer periphery of the insertion port 131 formed in the short pipe 130 is held in the spacer 30 in a locked state. When the spacer 30 is crushed, the short pipe 130 side can be expanded and contracted with respect to the push ring 21 and the receiving member 22 through the flexible space S.
Further, the telescopic flexible joint structure of the present invention can be applied to various types of piping equipment such as short pipes having a shape and length different from the above short pipes and pipe materials other than short pipes, and in any case. Even if there is, it is possible to exert stretch flexibility as in the above-described embodiment. Moreover, it can be applied to horizontal piping in addition to vertical piping.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the description of the embodiments, and is within the scope of the invention described in the claims of the present invention. Therefore, various changes can be made.

10 Valve body (plumbing equipment)
21 Push ring 22 Receptacle member 30 Spacer 31 Rubber ring 32 Retaining ring 33 Backup ring 40 Body 41 Insertion port 50 Locking ridge 54 Mounting groove 130 Short pipe (plumbing equipment)
S Flexible space

Claims (5)

An insertion port provided in the piping equipment, a push ring fitted loosely on the outer peripheral surface of the insertion port through a flexible space, a receiving member to which the push ring is fixed, and an outer peripheral surface of the insertion port. A sealing property is maintained between the locking ridges formed integrally or separately, the spacer held on the inner circumference of the push ring, and the inner peripheral surface of the receiving member and the outer peripheral surface of the insertion port. The locking ridge portion is held in a locked state by the spacer in normal times, and when the spacer is stretchable and flexible, the spacer is crushed and stretchable and flexible through the flexible space. The telescopic flexible joint structure is characterized by this. An insertion port provided in the body for a repair valve, a push ring fitted loosely on the outer peripheral surface of the insertion port via a flexible space, a receiving member to which the push ring is fixed, and an outer circumference of the insertion port. Sealing property between the locking ridges formed integrally or separately on the surface, the spacer held on the inner circumference of the push ring, and the inner peripheral surface of the receiving member and the outer peripheral surface of the insertion port. It is provided with a rubber ring for holding the spacer, and the locking ridge portion is held in a locked state by the spacer in normal times, and when the spacer is stretchable and flexible, the spacer can be expanded and contracted through the flexible space. Seismic repair valve characterized by flexing. A retaining ring is mounted in a mounting groove composed of the push ring and / or a receiving member, and the spacer held on the inner circumference of the retaining ring is formed integrally or separately at the insertion port. The telescopic flexible joint structure and seismic repair valve according to claim 1 or 2, wherein the stoppage portion is held in a locked state. The telescopic flexible joint structure and seismic repair valve according to claim 1 to 3, wherein the rubber ring is pressed by the retaining ring or the push ring when the body is in the telescopic flexible state. The telescopic flexible joint structure and seismic repair valve according to claim 4, wherein a backup ring is interposed between the retaining ring or the push ring and the rubber ring.

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