JPH04101888U - Disengagement prevention pipe fitting - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a pipe joint to prevent separation, which normally withstands the force of separation due to water pressure, and which exhibits seismic function in the event of an earthquake. [Structure] Sealing material placement recess 3 formed on the inner periphery of the socket 1
A sealing material 4 that exhibits sealing performance by being compressed between the outer periphery of the socket 2 is arranged, and a protrusion 9 is provided at a position closer to the opening of the socket 1 than the contact part with the sealing material 4 on the outer periphery of the socket 2. A ring groove 6 is formed at a position an appropriate distance from the sealing material arrangement recess 3 on the inner circumference of the socket 1 toward the opening side of the socket 1, and a plurality of locking rings 8 divided in the circumferential direction are attached to the ring groove 6. A push bolt 13 is provided that penetrates from the outer periphery of the socket 1 and engages with the outer periphery of the locking ring 8, and the locking ring 8 is swingable in the pipe axis direction within the ring groove 6, and the inner peripheral portion thereof is the socket. 1 is formed in a cross-sectional shape such that the pointed protrusion 18 on the inner circumference bites into the outer circumference of the insertion port 2 when it swings in the direction toward the opening.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to breakaway prevention pipe joints, especially for exposed piping in public ditches and tunnels. The present invention relates to a separation prevention pipe joint that can be suitably applied to bent portions, etc.

0002

[Conventional technology]

Conventionally, in the event of an earthquake, the final Separation-prevention pipe fittings with earthquake-resistant functions that prevent pipe separation are known. .

0003 By the way, in buried pipes, water pressure and dynamic pressure due to water flow occur at the bends of the pipe. Even if a breakout force is applied to the pipe, it will be supported by the surrounding soil, so It is possible to directly apply detachment prevention pipe fittings with such seismic function to However, exposed piping 31 in the common ditch 30 or exposed inside the tunnel as shown in Figure 5 In piping, common ditches and tunnels are used to support the uneven force and escape force caused by water pressure. It is necessary to fix the bent part 32 of the pipe 31 to an anchor block 34 etc. fixed to the wall surface. was there. In addition, in FIG. 5, 33 is a movable pipe holder that supports the pipe 31.

0004

[Problem that the idea aims to solve]

However, if the bent part 32 of the pipe 31 is fixed to the wall of the common groove 30, the common It is undesirable that pull-out force acts on the groove 30, and ground movement may occur due to earthquakes, etc. If this occurs and joints such as the common groove 30 move significantly, the bent portion 32 of the pipe 31 will move. The seismic function of the piping itself will be damaged, and the piping will move further. The problem is that there is a risk that excessive force will be applied to the withdrawal prevention part and it will come off. was there.

[0005] This invention solves the above problem, and is designed to withstand the pull-out force normally caused by water pressure, and to The purpose is to provide pipe joints that prevent separation and exhibit earthquake resistance during earthquakes. be.

[0006]

[Means to solve the problem]

In order to solve the above problem, the present invention has a sealing material placement recess formed on the inner periphery of the socket. A sealing material that is compressed between the outer circumference of the socket and exhibits sealing performance is placed between the outer circumference of the socket and the outer circumference of the socket. A protrusion is provided at a position closer to the opening of the socket than the contact area with the sealing material on the periphery, and the sealing material on the inner periphery of the socket is A ring groove is formed at an appropriate distance from the placement recess to the socket opening side, and the ring groove is A locking ring divided into multiple parts in the circumferential direction is installed, and the locking ring is inserted from the outer periphery of the socket. A locking ring is provided with a push bolt that engages with the outer circumference of the ring, and the locking ring swings in the direction of the tube axis within the ring groove. When the inner circumference swings in the direction toward the socket opening, the pointed protrusion on the inner circumference will move out of the socket. It is formed in a cross-sectional shape that bites into the circumference.

[0007]

[Effect]

When the detachment prevention pipe joint with the above configuration is applied to the bent part of the pipe, the water pressure that constantly acts on it can be applied. Therefore, when the socket tries to pull out from the socket, the inner circumference of the locking ring will be directed toward the socket opening. The socket swings in this direction, and the pointed protrusion on the inner circumference bites into the outer circumference of the socket. It is supported by the socket via the pointed protrusion of the socket, and the socket and socket are prevented from slipping out. on the other hand When a large external force is applied during an earthquake, excessive force is applied to the protrusion on the inner circumference of the locking ring. The protrusion on the outer periphery of the receptacle is connected to a locking ring or separately installed. It is possible to move relative to the pipe axis direction to the position where it engages with the locked lock ring, making it earthquake resistant. Demonstrate function.

[0008]

【Example】

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. In FIGS. 1 and 2, 1 is a socket, and 2 is a socket inserted into the socket 1. socket A sealing material placement recess 3 is formed at an intermediate position in the tube axis direction on the inner circumferential surface of the The material is compressed between the material placement recess 3 and the outer peripheral surface of the socket 2 inserted into the socket 1. A so-called slip-on type sealing material 4 that exhibits sealing performance is arranged. . Place the seal material at an appropriate distance from the recess 3 on the inner peripheral surface of the socket 1 toward the opening side of the socket 1. A lock ring groove 5 is formed, and the opening of the socket 1 is further extended from the lock ring groove 5. A ring groove 6 is formed on the mouth side. Lock ring groove 5 is divided into one place in the circumferential direction. A lock ring 7 having a diameter expansion force of A locking ring 8 divided into two is attached. Seal material on the outer peripheral surface of insertion port 2 At a position closer to the socket opening than the contact area of 4, there is a lock ring 7 that can be engaged with the lock ring 7 in the tube axis direction. An annular protrusion 9 is provided in a protruding manner. Outside the position where the lock ring groove 5 of the socket 1 is formed A plurality of screw holes 10 are formed in the circumferential direction to penetrate into this lock ring groove 5 from the circumference. , a push bolt that reduces the diameter of the lock ring 7 and engages with the outer periphery of the socket 2. 11 are screwed together. Also, from the outer periphery of the position where the ring groove 6 of the socket 1 is formed, this There are multiple threaded holes 12 penetrating the ring groove 6 in the circumferential direction, specifically the locking ring 8. are formed at both ends of each divided piece or at locations corresponding to three or more locations, and each has a push button. The bolt 13 is screwed together. Each push bolt 13 has its tip attached to the outer periphery of the locking ring 8. This locking ring 8 is pressed against the outer periphery of the socket 2 by contacting with the locking ring 8 . and lock As shown in FIGS. 2 and 3, the ring 8 swings a certain amount in the tube axis direction within the ring groove 6. When the inner circumference is movable and swings in the direction toward the opening of the socket 1, the pointed protrusion on the inner circumference 18 is formed in a cross-sectional shape that bites into the outer periphery of the socket 2.

[0009] According to the detachment prevention pipe joint with the above configuration, the protrusion 9 on the outer periphery of the insertion port 2 is a lock ring. 7 and the sealing material 4, with the push bolt 13. The locking ring 8 is pressed against the outer periphery of the socket 2. Then, it is received by the water pressure inside the pipe. When Socket 2 tries to come out from Socket 1, as shown in Figure 3, as Socket 2 moves, The inner periphery of the locking ring 8 is the contact point with the tip of the push bolt 13 on the outer periphery of the locking ring 8. as a fulcrum in the direction toward the opening of the socket 1, and as a result, the inner circumference of the locking ring 8 In order for the pointed protrusion 18 to bite into the outer periphery of the socket 2 and lock it, the socket 2 has a locking ring. It is supported by the socket 1 through the pointed protrusion 18 of 8, and prevents the socket 1 and the socket 2 from coming off. be done. The locking force generated by this pointed protrusion 18 is sufficient to withstand the pulling force caused by water pressure. It is set as follows. On the other hand, if a large external force is applied during an earthquake, etc., the locking ring Excessive force is applied to the pointed protrusion 18 on the inner circumference of 8, making it impossible to lock the protrusion 9. The socket 1 and the socket 2 can be moved relative to each other in the pipe axis direction until they engage with the lock ring 7. and exhibits earthquake-resistant functions.

0010 Thus, the detachment prevention pipe joint with the above structure can be installed in the common groove 30 as shown in FIG. When applied to the exposed piping 31, the entire piping 31 including the bent portion 32 is mounted on the movable tube holder 3. 3 can be installed on the wall of the common ditch 30 by installing an anchor block etc. There is no need to fix it.

[0011] In the above embodiment, the lock ring 7 and the retaining ring 8 are arranged side by side, but in some cases The engagement between the locking ring 8 and the protrusion 9 prevents the socket 1 and the socket 2 from finally separating. It is also possible to omit the lock ring 7.

0012 In addition to the above embodiments, the present invention may be modified in various ways within the scope of the claims. It can be carried out under the following conditions.

[0013]

[Effect of the idea]

As described above, according to the detachment prevention pipe joint of the present invention, the water pressure that is constantly applied When the socket tries to come out from the socket, the inner circumference of the locking ring will move toward the socket opening. The socket swings in the opposite direction and the sharp protrusion on the inner circumference bites into the outer circumference of the socket. It is supported at the socket through the part, and prevents the socket and socket from coming off. If a large external force is applied to the locking ring, excessive force will be applied to the sharp protrusion on the inner circumference of the locking ring, causing it to lock. The protrusion on the outer periphery of the socket and socket cannot be stopped by a locking ring or a separately provided lock. It is possible to move relative to the pipe axis direction to the position where it engages with the lock ring, and the specified earthquake resistance function is achieved. Therefore, it can be effectively applied to bent parts of exposed piping.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a detachment prevention pipe joint according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the detachment prevention pipe joint.

FIG. 3 is an enlarged sectional view of essential parts of the detachment prevention pipe joint in an operating state.

FIG. 4 is a plan view showing an exposed piping state using the detachment prevention pipe joint.

FIG. 5 is a plan view showing a state of exposed piping in a conventional example.

[Explanation of symbols]

1 socket 2 Socket 3 Sealing material placement recess 4 Sealing material 6 Ring groove 8 Locking ring 9 Protrusion 13 Push bolt 18 Pointed part

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Hitoshi Inada 2-26 Ohamacho, Amagasaki City, Hyogo Prefecture Co., Ltd. Inside Kubota Mukogawa Factory (72) Inventor: Atsushi Kazuyama 2-26 Ohamacho, Amagasaki City, Hyogo Prefecture Co., Ltd. Inside Kubota Mukogawa Factory

Claims (1)

[Scope of utility model registration request] [Claim 1] A sealing material that exhibits sealing performance by being compressed with the outer periphery of the socket is arranged in a sealing material placement recess formed on the inner periphery of the socket, and the sealing material is compressed between the outer periphery of the socket and the contact area with the sealing material. A protrusion is provided at a position on the socket opening side, a ring groove is formed at an appropriate distance from the sealing material placement recess on the inner periphery of the socket toward the socket opening side, and a locking ring is divided into multiple parts in the circumferential direction in this ring groove. A push bolt is installed that penetrates from the outer periphery of the socket and engages with the outer periphery of the locking ring. A separation-preventing pipe joint characterized in that it is formed in a cross-sectional shape such that a sharp protrusion on the inner periphery bites into the outer periphery of the insertion port when it swings in a direction toward .