JPH04101887U - 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 detachment method in which the socket 2 is inserted into the socket 1, and a protrusion 7 provided on the outer periphery of the tip of the socket 2 is engaged with a lock ring 6 attached to the inner periphery of the socket 1 to prevent detachment. In the prevention pipe joint, an engagement member 11 that engages with the lock ring 6 with a space provided between the lock ring 6 and the protrusion 7 in the tube axis direction is provided on the outer periphery of the insertion port 2, and this engagement member 11 is installed so that it will come off the outer periphery of the socket 2 when a load exceeding a specified level is applied.

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 pipes 31 in the common ditch 30 and exposed pipes in the tunnel as shown in Fig. For outlet piping, use a common ditch or tunnel 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 of the There was a point. In addition, in FIG. 10, 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 problems, the present invention has been developed by inserting a socket into the socket and inserting a socket around the inside of the socket. Engage the protrusion on the outer periphery of the tip of the socket with the lock ring attached to the socket to remove it. In the pipe joint that prevents separation, there is a gap between the lock ring and the protrusion in the pipe axis direction. A member that engages with the lock ring or protrusion when installed is installed on the outer periphery of the socket or the inner periphery of the socket. However, this member will come off from the outer periphery of the socket or the inner periphery of the socket if a load exceeding the specified level is applied. It is installed so that

[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. The pull-out force due to the lock ring or protrusion of the socket or socket is It is supported by the engagement of the materials and prevents the receptacle and the receptacle from coming off. On the other hand, during an earthquake If a large external force is applied to the It is possible to move relative to the tube axis direction to the position where it engages, demonstrating earthquake resistance function.

[0008]

【Example】

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 9. In FIG. 1 showing the first embodiment of the present invention, 1 is a socket, and 2 is a socket inserted into the socket 1. The opening end of the inner peripheral surface of the socket 1 has a tape into which the sealing material 3 is press-fitted. A par-shaped sealing surface 4 is formed, and a lock ring groove 5 is formed in the inner part thereof. child The lock ring groove 5 is inserted through the gap between the inner peripheral surface of the socket 1 and the outer peripheral surface of the socket 2. A split lock ring 6 that can be inserted and has a diameter expansion biasing force is installed. . On the outer periphery of the tip of the insertion port 2, there is an annular protrusion that can be engaged with the lock ring 6 in the tube axis direction. 7 is fixed by welding. 8 is interposed between the sealing material 3 and the lock ring 6. This backup ring 8 and lock ring 6 are The engagement surface is formed into a tapered surface, and the lock ring groove 5 is formed by reducing the diameter of the lock ring 6. It is configured to prevent them from leaving. 9 faces the opening end surface of the socket 1. It is a press ring that is placed in place, and is tightened with the opening flange 1a of the socket 1 and bolts and nuts 10. By being tied together, the sealing material 3 is pressed toward the inner part of the socket 1. In addition, press The ring 9 is fitted around the outer periphery of the projection 7 before it is welded and attached.

[0009] In the detachment prevention pipe joint with the above basic configuration, in this embodiment, the protrusion at the tip of the insertion port 2 is The portion 7 is located intermediate to both the lock ring 6 and the inner inner end 1b of the socket 1. In this state, the engaging member 11 that engages the lock ring 6 from the back side of the socket 1 is inserted into the socket. It is provided on the outer peripheral surface of 2. This engaging member 11 is welded 12 with low joint strength. installed. The weld 12 can sufficiently withstand the pull-out force due to water pressure, It is constructed so that it will break if a predetermined pull-out force beyond that is applied.

0010 According to the detachment prevention pipe joint with the above configuration, the water pressure that constantly acts between the socket 1 and the socket 2 The pull-out force is due to the engagement between the lock ring 6 of the socket 1 and the engagement member 11 of the socket 2. Since the socket 1 and the socket 2 are supported by the socket, the socket 1 and the socket 2 are reliably prevented from coming off. on the other hand, If a large external force is applied during an earthquake, etc., the engagement member 11 may not be installed in the socket 2. As the weld 12 is damaged and the engaging member 11 comes off from the outer circumferential surface of the socket 2, the socket 1 and The insertion port 2 is inserted into the tube axis until the lock ring 6 and the protrusion 7 engage with each other via the engagement member 11. 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. Piping can be installed on top of the pipe, and there is no need to install an anchor block or the like to secure it. .

0012 Figure 1 shows the basic configuration of a separation prevention pipe joint with a relatively small diameter of 450 mm or less. The example shown is one that can be applied to large-diameter pipes, but as shown in Figure 2, it can also be applied to large-diameter pipes. It can be similarly applied to detachment prevention pipe fittings.

[0013] In FIG. 2, in order to increase the engagement retention force of the lock ring 16 with respect to the socket 1, , a deep lock ring groove 15 is formed on the inner peripheral surface of the socket 1, and a diameter reduction biasing force is applied. A single lock ring 16 is used, and a backup lock ring 16 is used. The coupling 18 has a rectangular cross section. In addition, the press ring 19 has a protrusion. A first ring 19a that is divided into a plurality of parts and contacts the sealing material 3 to allow the passage of the ring 7. and an annular second ring 19b that engages with the outer periphery of the ring. Also, push ring A bolt/nut 20 for fastening the socket 19 is installed on the open end surface of the socket 1.

It goes without saying that the example shown in FIG. 2 also has the same effect as the case shown in FIG. To give a specific numerical example, in a pipe joint with a diameter of 450 mm, the withdrawal force corresponding to a water pressure of 5 kgf/cm ² is 8.9 tons. On the other hand, if the engaging member 11 is attached by welding 12 with a leg length of 5 mm and a welding length of 380 mm, the detachment prevention force of this engaging member 11 will be 27 tons, and the seismic function will be lost when a force greater than that is applied. Demonstrated. In addition, for a pipe joint with a diameter of 700 mm, the withdrawal force due to the same water pressure is 21.1 tons, whereas when the engaging member 11 is attached with a weld 12 with a leg length of 5 mm and a weld length of 900 mm, the withdrawal prevention force is 21.1 tons. is 64 tons.

[0015] Next, a second embodiment of the present invention and a modification thereof will be described with reference to FIGS. 3 and 4. Na The same reference numerals are used for the same components as those explained in Figures 1 and 2. Therefore, the explanation of the structure and operation will be omitted, and only the differences will be explained. This is the following The same applies to each embodiment.

[0016] In this embodiment, instead of the engaging member 11 in the first embodiment, the outer circumferential surface of the socket 2 is The raised weld bead 21 is directly engaged with the lock rings 6 and 16. , normally, this weld bead 21 prevents the socket 2 from coming out from the socket 1, and the ground If excessive force is applied during an earthquake, this weld bead 21 will be damaged and the earthquake resistance will be reduced. Demonstrate function.

[0017] Next, a third embodiment of the present invention and a modification thereof will be described with reference to FIGS. 5 and 6. child In the first embodiment, the engaging member 11 is welded to the socket 2 by welding 12 with a weak joining force. Whereas it was attached to the outer circumferential surface, it was attached with bolt 22, so it could not be used in the event of an earthquake. If excessive force is applied to the engagement member 1, etc., the bolt 22 will break and the engagement member 1 will break. 1 comes off the outer circumferential surface of the socket 2 and exhibits an earthquake-resistant function.

[0018] To give a specific numerical example, if the bolt 22 has a diameter of 450 mm, an M8 bolt is used. When using 14 pieces of If 20 10 bolts are used, the detachment prevention force will be 62.8 tons.

[0019] Next, a fourth embodiment of the present invention and a modification thereof will be described with reference to FIGS. 7 and 8. In the above embodiment, the engagement member 11 and the weld bead 2 are attached to the lock rings 6 and 16. An example was shown in which the socket 2 was prevented from slipping out from the socket 1 by engaging the socket 1. In this example, a member that engages with the protrusion 7 on the outer periphery of the tip of the socket 2 is provided on the socket 1 side. It is. Specifically, a bolt hole 23 penetrating from the outer peripheral surface of the socket 1 to the inner peripheral surface is formed. The engaging portion 25 at the tip of the engaging bolt 24 screwed thereon is engaged with the protrusion 7. ing. Also, the fluid inside the pipe leaks to the outside from the gap between the bolt hole 23 and the engagement bolt 24. In order to prevent leakage, a portion of the engagement bolt 24 protrudes from the outer peripheral surface of the socket 1. A seal cap 26 is screwed onto the seal cap 26, and a seal material 2 is placed between the end surface of the seal cap 26 and the outer peripheral surface of the socket 2. 7 is interposed.

[0020] Also in this embodiment, the engaging portion 25 of the engaging bolt 24 is normally engaged with the protrusion 7. This prevents the socket 2 from slipping out from the socket 1, and prevents it from becoming too large in the event of an earthquake. If a strong force is applied, the engaging portion 25 of the engaging bolt 24 may break or deform. Then, the engagement with the protrusion 7 is released, and the seismic function is exhibited.

[0021] 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.

[0022]

[Effect of the idea] As described above, according to the detachment prevention pipe joint of the present invention, disconnection is caused by constantly acting water pressure. The ejecting force is due to the engagement between the lock ring or protrusion of the socket or insertion port and the member attached to the other side. This ensures that the socket and socket do not come off due to water pressure, and If a large external force is applied during an earthquake, the member may come off and the socket and socket may become locked together. The lock ring and the protrusion can be moved relative to each other in the direction of the tube axis until they engage, and the specified resistance is achieved. Because it exhibits seismic function, 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 in a first embodiment of the present invention.

FIG. 2 is a sectional view of a modification in which the first embodiment is applied to another type of pipe joint.

FIG. 3 is a sectional view of a detachment prevention pipe joint according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a modification in which the second embodiment is applied to another type of pipe joint.

FIG. 5 is a sectional view of a detachment prevention pipe joint according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a modification in which the third embodiment is applied to another type of pipe joint.

FIG. 7 is a sectional view of a detachment prevention pipe joint according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view of a modification in which the fourth embodiment is applied to another type of pipe joint.

FIG. 9 is a plan view showing an exposed piping state using the detachment prevention pipe joint of each embodiment.

FIG. 10 is a plan view showing a state of exposed piping in a conventional example.

[Explanation of symbols]

1 socket 2 Socket 6,16 lock ring 7 Protrusion 11 Engagement member 12 Welding with weak joining strength 21 Welding bead 22 volts 24 Engagement bolt 25 Engagement part

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Yo Nagai 2-26 Ohamacho, Amagasaki City, Hyogo Prefecture Co., Ltd. Inside Kubota Mukogawa Factory (72) Creator Keita Kaneko 2-26 Ohamacho, Amagasaki City, Hyogo Prefecture Co., Ltd. Inside Kubota Mukogawa Factory

Claims (1)

[Scope of utility model registration request] [Claim 1] A detachment prevention pipe joint in which a socket is inserted into a socket and a protrusion provided on the outer periphery of the distal end of the socket is engaged with a lock ring attached to the inner periphery of the socket to prevent separation, A member that engages with the lock ring or the protrusion is provided on the outer periphery of the insertion port or the inner periphery of the receptacle with a space provided between the lock ring and the protrusion in the tube axis direction, and when a load exceeding a predetermined value is applied to this member, A detachment prevention pipe joint characterized in that it is installed so as to come off from the outer periphery of the insertion port or the inner periphery of the socket.