JPH04101885U - 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] A sealing material 3 is interposed between the inner periphery of the opening end of the socket 1 and the outer periphery of the socket 2, and a press ring 9 is provided to press the sealing material 3 toward the back of the socket 1. A protrusion 8 is provided protrudingly on the outer periphery of the tip of the socket 1, and a lock ring groove 5 is formed on the inner side of the inner periphery of the socket 1 from where the sealing material is arranged. The ring 6 is attached, and a push bolt 12 is provided that penetrates from the outer periphery of the socket 1 and engages with the outer periphery of the lock ring 6, and the lock ring 6 is swingable in the tube axis direction within the lock ring groove 5. When the inner circumference swings in the direction toward the opening of the socket 1, the pointed protrusion 17 on the inner circumference moves toward the opening of the socket 2.
It is formed into a cross-sectional shape that bites into the outer periphery.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to breakaway prevention pipe joints, especially for exposed pipes in public ditches and tunnels. This invention relates to a separation-preventing pipe joint that can be suitably applied to curved parts and the like.

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 4 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. 4, 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 developed a system between the inner periphery of the opening end of the socket and the outer periphery of the socket. A sealing material is inserted, and a press ring is provided to press the sealing material toward the back of the socket. A protrusion is provided on the outer periphery of the tip of the socket, and it locks further back than the sealing material placement position on the inner periphery of the socket. A lock ring that forms a ring groove and is divided into multiple parts in the circumferential direction in this lock ring groove. Attach the push bolt that penetrates from the outer periphery of the socket and engages the outer periphery of the lock ring. The lock ring is swingable in the direction of the tube axis within the lock ring groove, and the inner circumference is The cut-off is such that the sharp protrusion on the inner circumference bites into the outer circumference of the socket when it swings in the direction toward the socket opening. It is formed into a planar shape.

[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 lock ring will close to the socket opening. The socket swings in the direction toward which it is facing, and the pointed protrusion on its inner circumference bites into the outer circumference of the socket. It is supported by the receptacle via this sharp protrusion, and the receptacle and receptacle are prevented from slipping out. one On the other hand, if a large external force is applied during an earthquake, excessive force may be applied to the protrusion on the inner circumference of the lock ring. The force acts and the locking becomes impossible, and the lock ring and the protrusion at the tip of the socket become unlatched. It is possible to move relative to the tube axis direction until it reaches the engagement position, and exhibits earthquake-resistant function.

[0008]

【Example】

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. In Figure 1, 1 is a socket, 2 is a socket inserted into socket 1, and 2 is a socket inserted into socket 1. A tapered sealing surface 4 is formed at the open end of the peripheral surface, into which a sealing material 3 is press-fitted. , a lock ring groove 5 is formed in the inner part thereof. This lock ring groove 5 has a circumferential A lock ring 6 divided into a plurality of parts in the direction is attached. 7 is sealing material 3 and This is a backup ring interposed between the back rings 6 and 6. Outer circumference of tip of insertion port 2 An annular protrusion 8 that can be engaged with the lock ring 6 in the tube axis direction is fixed by welding. ing. Reference numeral 9 denotes a press ring disposed opposite to the open end surface of the socket 1; Seal is achieved by fastening with a fastening bolt 10 planted on the end face of the mouth and a nut. Press the material 3 toward the back of the socket 1. This push ring 9 is a protrusion at the tip of the socket 2. a plurality of divided first rings 9a that are in contact with the sealing material 3 so as to be able to pass through the sealing material 8; It is composed of an annular second ring 9b that engages with the outer circumference of the first ring 9a. Ru.

[0009] From the outer periphery of the socket 1 at the position where the lock ring groove 5 is formed, to this lock ring groove 5. Penetrating screw holes 11 are provided at multiple locations in the circumferential direction, specifically, in each divided piece of the lock ring 6. is formed at both ends or at locations corresponding to three or more locations, and a push bolt 12 is attached to each of the locations. They are screwed together. Each push bolt 12 has its tip abutted against the outer periphery of the lock ring 6. This lock ring 6 is pressed against the outer periphery of the socket 2. Receptacle of push bolt 12 A seal cap 13 is screwed onto a portion protruding from the outer periphery of the mouth 1. The sealing material 14 attached to the end face of the tap 13 is pressed against the outer periphery of the socket 1 to seal the screw hole 11. This prevents the fluid in the pipe from leaking from the gap between the push bolt 12 and the push bolt 12. and, The lock ring 6 can swing within the lock ring groove 5 by a certain amount in the tube axis direction. When the inner circumference swings in the direction toward the opening of the socket 1, the pointed protrusion 17 on the inner circumference moves toward the opening of the socket 1. It is formed in a cross-sectional shape that bites into the outer periphery of.

0010 According to the detachment prevention pipe joint configured as above, the protrusion 8 at the tip of the insertion port 2 is a lock ring. The push bolt is positioned midway between both the plug 6 and the inner end 1a of the socket 1. At 12, the lock ring 6 is pressed against the outer periphery of the socket 2. Then, the water in the pipe When the socket 2 tries to come out from the socket 1 due to the pressure, as shown in Fig. 2, the socket 2 As the inner circumference of the lock ring 6 moves, the push bolt 1 on the outer circumference of the lock ring 6 2 swings in the direction toward the opening of socket 1 using the point of contact with the tip as a fulcrum, and as a result, the Since the pointed protrusion 17 on the inner circumference of the lock ring 6 bites into the outer circumference of the socket 2 and locks it, The socket 2 is supported by the socket 1 via the pointed protrusion 17 of the lock ring 6, and is connected to the socket 1. The mouth 2 is prevented from slipping out. The locking force by this pointed protrusion 17 is due to the release due to water pressure. It is set to withstand sufficient force. On the other hand, large external forces are generated during earthquakes, etc. If the lock ring 6 is used, excessive force will be applied to the sharp protrusion 17 on the inner circumference of the lock ring 6, making it impossible to lock the lock ring 6. Now, the socket 1 and the socket 2 are aligned with the pipe shaft until the protrusion 8 engages with the lock ring 6. It becomes possible to move relative to each other in the direction, and exhibits earthquake resistance function.

[0011] 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.

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 lock ring will move toward the socket opening. The socket swings in this direction and the pointed protrusion on its inner circumference bites into the outer circumference of the socket. It is supported by the socket through the protrusion, preventing the socket and socket from coming off, and also preventing the socket from slipping out during an earthquake. If a large external force is applied to the lock ring, excessive force will be applied to the protrusion on the inner circumference of the lock ring. The socket becomes unlatched, and the socket and socket are at a position where the lock ring and the protrusion at the tip of the socket engage. It is possible to move relative to the pipe axis direction until the It can be effectively applied to bent portions of pipes.

[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 a sectional view of the detachment prevention pipe joint in an operating state.

FIG. 3 is a plan view showing an exposed piping state in which the detachment prevention pipe joint is used.

FIG. 4 is a plan view showing a state of exposed piping in a conventional example.

[Explanation of symbols]

1 socket 2 Socket 3 Sealing material 5 Lock ring groove 6 Lock ring 8 Protrusion 9 Press ring 12 Push bolt 17 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 is interposed between the inner periphery of the opening end of the socket and the outer periphery of the socket, and a press ring is provided to press the sealing material toward the back of the socket, and the sealing material is provided on the outer periphery of the tip of the socket. A protrusion is provided,
A lock ring groove is formed on the inner periphery of the socket at the back of the sealing material placement position, a lock ring divided into multiple parts in the circumferential direction is installed in this lock ring groove, and the lock ring is inserted from the outer periphery of the socket to the outer periphery of the lock ring. A lock ring is provided with a push bolt that engages with the lock ring, and when the lock ring is swingable in the direction of the tube axis within the lock ring groove, and when the inner circumference swings in the direction toward the socket opening, the sharp protrusion on the inner circumference closes the socket. A detachment prevention pipe joint characterized by being formed in a cross-sectional shape that bites into the outer periphery.