JP2001289389A - Earthquake-proof structure of pipe passage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To followingly displace a pipe passage 1 without being destroyed by sliding a packing 9 and a ring 10 while maintaining air tightness therebetween when a joint portion 4 of the pipe 1 is destroyed by a severe earthquake, to keep the flow passage if a fluid is leaked into a shell 11 and to open/close the flow passage by using a valve. SOLUTION: This earthquake-proof structure comprises the cylindrical shell 11 arranged on the outer peripheries of the joint portion 4 and the pipe passage 1 at both sides thereof so as to encircle the joint portion 4 of the pipe passage 1, the packing 9 of an elastic material formed on the outer periphery face of the pipe passage, and the rings 10 having diameters somewhat smaller than the outer diameter of the packing 9, provided at both ends of the shell 11, the ring 10 being tightly fitted on the outer periphery of the packing 9 in the state of compressing the packing 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an existing pipeline such as a gas pipe or a water pipe, and when a joint such as a valve or a joint in the pipeline is deformed due to an earthquake or the like, the joint is fatal. The present invention relates to an anti-seismic device for preventing breakage of a fluid, preventing fluid from flowing out, and maintaining a minimum function.

[0002] In this specification, the term "joint" is not limited to a joint connecting two pipes, but includes a structure integrally joined by means such as welding, and further includes a plurality of pipes. A structure in which a path is directly or indirectly connected with a structure such as a valve therebetween is widely referred to.

[0003]

2. Description of the Related Art Most of piping systems for gas pipes and water pipes are buried underground, but valves are provided at required places as necessary. These valves are usually provided in the underground manhole, and are connected to the pipe by joints on both sides thereof.

[0004] However, since these valves are provided in the space, when an earthquake or the like occurs, the displacement due to vibration is large, and the joints provided on both sides of the valve are liable to be deformed, broken, come out or the like. . When such a situation occurs, the fluid inside the valve is ejected and its flow is interrupted. When such a situation occurs, not only may the turbulence caused by the earthquake be hindered, but also in the case where the fluid is gas, there is a risk of causing a secondary disaster such as igniting the leaked gas.

[0005] As a countermeasure, various anti-seismic valves have been proposed which can cope with a large displacement caused by an earthquake or the like. At present, it is difficult to make progress because it is necessary to temporarily cut off distribution and costs are high.

Various structures have been proposed for reinforcing the periphery of the valve with a resin or the like. However, such a structure is to fix the joint so that it does not move, and when a large vibration is encountered due to an earthquake or the like. However, there is a possibility that a load exceeding its strength may be applied, and it is not possible to completely prevent breakage.

[0007] Looking at the situation of damage to various pipelines caused by the Great Hanshin-Awaji Earthquake, many of the structures with increased strength of the material and withstands vibration by the rigid structure were damaged by a load exceeding the expected strength. However, there are many examples of flexible structures that can follow the displacement caused by vibration, even if the strength of the material itself is low, without receiving a large load and securing a lifeline without damage. I have.

[0008] In view of such circumstances, the applicants and the like have invented and applied for a valve safety device that can be constructed without interrupting the flow of fluid and that can follow the displacement caused by an earthquake (Japanese Patent Application No. 10-103,197). -102684, Japanese Patent Application No. 11-282271
issue).

[0009]

However, since these safety devices have many types of constituent members and their structures are complicated, there is a problem that it takes time to attach all the members to the valve. Furthermore, this safety device is used as an airtight member to prevent the fluid from flowing out.
Since a pressure-resistant and air-tight tube member made of a plastic tube or the like is used, the mounting work to the valve is not easy.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and when a joint such as a valve is deformed or broken due to an earthquake or the like in a pipeline, it is possible to reliably prevent fluid from flowing out by a flexible structure. It is an object of the present invention to provide a joint earthquake-resistant structure that can temporarily secure the functions of a pipeline and a valve, has few types of constituent members, has a simple structure, and has good workability.

[0011]

According to the present invention, a tubular outer shell is arranged on the outer periphery of the joint and the pipes on both sides thereof so as to surround the joint of the pipe. A packing made of an elastic material is formed on the outer peripheral surface of the road, and a ring having a diameter slightly smaller than the outer diameter of the packing is provided at both ends of the outer shell, and the ring compresses the packing on the outer circumference of the packing. And is closely fitted.

In the present invention, the joint portion may include a valve connected to two pipes and a joint between the valve and the pipe. When the ring is attached to the outer shell, it is preferable that the ring be slidable in the radial direction.

In the present invention, it is preferable that the packing is formed by injecting a curable resin liquid into a mold assembled on the outer periphery of the pipeline, hardening the resin, and molding and fixing the liquid on the surface of the pipeline.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example in which the present invention is applied to a valve as a joint provided in a pipeline will be described with reference to the drawings. 1 is a pipeline, 2 is a valve provided in the pipeline 1, the valve 2 and the pipeline 1 are connected by a flange joint 3, and these valves 2 and the flange joint 3 It constitutes the joint part 4 in the present invention.

In the valve 2, an operation shaft 6 is provided upright on an operation section 5, and a handle (not shown) is fitted to the operation shaft 6 to rotate the valve 2, thereby opening and closing the valve 2. It is supposed to. 7 is the valve 2
And a lid plate 8 above which bolts 8
The operation unit 5 is secured by being tightened with a, and the operation unit 5 projects above the cover plate 8.

Reference numerals 9 denote ring-shaped packings provided on the outer peripheral surface of the pipeline 1 outside the flange joint 3 on both sides of the valve, respectively, and are firmly fixed to the outer peripheral surface of the pipeline 1. ing.

The packing 9 may be formed by fitting a separately molded packing into the pipeline 1 and bonding the same, but a ring-shaped mold divided into a plurality of parts on the outer peripheral surface of the pipeline 1 is acceptable. Is assembled, and after the curable resin liquid is injected between the pipe 1 and the mold, it is cured to form a ring-shaped packing 9 along the outer peripheral surface of the pipe 1 without interrupting the flow of the fluid. Can be fixed.

The material of the packing 9 is not particularly limited as long as it has rubber elasticity. However, in consideration of workability at the site, a two-component hard polyurethane resin is suitable. Its hardness is Shore A60-9
0 is appropriate. Other hard rubbers and elastomers can also be used.

The dimensions of the packing 9 should be set appropriately in accordance with the space at the place where the present seismic structure is to be installed and the required specifications. Considering that the amount is about 100 mm, it is appropriate to be about 110 to 200 mm,
The thickness is suitably 20 mm in consideration of the amount of compression by the ring 10 described later.

The outer end of the packing 9 has a tapered tapered surface 9 so that a ring 10 to be described later can be easily fitted into the outer peripheral surface of the packing 9 when the packing 9 is fitted tightly.
It is preferable to form a.

Reference numeral 11 denotes an outer shell for supporting the pressure of the fluid leaking when the joint portion 4 is broken, and is made of metal or FRP.
It is made of rigid material. And this outer shell 1
In 1, a side tube portion 13 is formed at an upper portion of a tubular main body portion 12, and has a substantially T-shaped tubular shape as a whole.

The main body 12 of the outer shell 11 is divided into two parts, an upper half and a lower half. The upper half is further divided into two parts. The members divided from the outside of the joint portion 4 are assembled without any modification to the pipe line 1 and the joint portion 4 of the above, and bolts are inserted between the string-like packings 16 on the flanges 14 formed at the respective joint portions. The outer shell 11 can be formed by bonding at 15. Note that the outer shell 11 can be subdivided into smaller members depending on the installation condition of the joint portion 4.

Reference numeral 10 denotes a ring having an inner diameter slightly smaller than the outer diameter of the packing 9 fixed to the outer periphery of the pipe 1. The inner diameter of the ring 10 depends on the hardness of the packing 9 but is generally 5 to 10 mm larger than the outer diameter of the packing 9.
It is appropriate to make it small.

The ring 10 is divided into two semicircular members, the mating surfaces of which are hermetically sealed. The flange pieces 17 protruding from the side surfaces are tightened with bolts 18 to form a ring. Formed. Further, the inner peripheral edge of the ring 10 is formed with a tapered tapered surface 10a in order to compress the packing 9 to enhance the sealing effect and reduce the resistance when the ring 10 is pushed into the outer peripheral surface of the packing 9. .

Reference numeral 19 denotes a ring retainer for attaching the ring 10 to the outer shell 11, which is also divided into two semicircular members similarly to the ring 10, and includes the ring retainer 19 and the outer shell. The ring 10 is held between a side flange 20 formed at an end of the ring 11 and a bolt 2
It is fixed at 1.

When attaching the ring 10 with the ring presser 19, it is preferable that a slight margin is formed on the outer periphery of the ring 10 as shown in the drawing, and the ring 10 is attached slidably in the radial direction of the pipeline 1. . The slidable range of the ring 10 is suitably about 10 to 20 mm.

In the example of the drawing, the ring 10 and the ring retainer 19 are formed by combining two semicircular ones, but the present invention is not limited to this, and the ring 10 and the ring holder 19 are divided into three or more parts. It does not matter.

To form the outer shell 11 outside the bulb 2, the lower half of the outer shell is placed under the bulb 2, and the upper half of the outer shell is assembled at the upper part. Covering the valve 2, the operating portion 5 of the valve 2 is projected from the tip of the side tube portion 13, and the flange portion 22 formed on the upper end of the side tube portion 13 is formed.
Is placed on the upper flange 7 of the valve, and from above the lid plate 8
And secure it with bolts 8a.

Each of the divided members constituting the outer shell 11 is fixed to the mating surface thereof by fastening the flange 14 with bolts 15 with the cord-like packing 16 interposed therebetween. Form a shell.

Next, the ring 10 is assembled outside both ends of the outer shell 11, and the ring retainer 19 is further assembled outside in a circular shape. Then, the ring 10 is brought closer to the side flange 20 of the outer shell 11, and the packing 9 is fitted while being compressed by the tapered surface 10a of the inner peripheral edge thereof.
Then, a ring retainer 19 is brought into contact with the side surface of the ring 10 and tightened with a bolt 21 to fix the ring 10 to the outer shell 11 with its inner peripheral edge closely fitted to the packing 9.

[0031]

According to the device of the present invention, the outer shell 11 is sealed by the string-like packing 16 sandwiched between the divided members, and the packing 9 and the ring 10 are provided between the outer shell 11 and the pipe 1.
Are tightly fitted to each other and the outer shell 1
1 is kept airtight.

In the normal state, the opening / closing section of the valve 2 is exposed to the outside of the apparatus, and can be opened / closed. When the flange joint 3 is damaged due to an earthquake or the like and fluid leaks, the leaked fluid stops in the outer shell 11 and does not flow out.

In the case where the flange joint 3 is completely destroyed due to severe earthquake motion or the like and a displacement in the pipe axis direction occurs between the pipe lines 1 on both sides, the packing 9 and the ring 10
The slides follow the displacement by sliding with a relative displacement in the tube axis direction, and maintain the airtightness at the position even after the sliding, and have a seismic resistance due to the flexible structure.

Although displacement in the pipe diameter direction may occur between the pipes 1 on both sides, generally the displacement generated in the pipe system by seismic motion is mainly in the pipe axis direction, and the displacement amount in the pipe diameter direction is small. Therefore, it is possible to follow by bending deformation of the pipeline 1 and the outer shell 11 in a long pipeline system, and furthermore, by slidably mounting the ring 10, it is possible to follow by sliding of the ring 10. As a result, the outer shell 11
No destruction or leakage of fluid occurs.

When the joint 4 generally consisting of the valve 2 and the flange joint 3 is destroyed by an earthquake, the most susceptible part is the flange joint 3, and one of the flange joints 3 having lower strength is destroyed. By doing so, the stress is released and the other flange joint 3
Is not destroyed.

Therefore, the valve 2 in a state where the flange joint 3 is broken is held by one of the valves 2 via the flange joint 3, and the fluid flowing out of the broken flange joint 3 is the outer shell. 11, the flow path through the valve 2 is secured, and the flow path can be opened and closed by operating the valve 2 unless the valve 2 is broken.

[0037]

Thus, according to the present invention, when the joint 4 of the pipeline 1 is broken by a severe earthquake or the like, the packing 9
By sliding the and the ring 10 while maintaining the airtightness, the pipeline 1 follows the displacement without being broken, and the fluid leaked from the broken joint 4 does not flow out.

According to the third aspect of the present invention, the ring 10
Slides in the radial direction of the pipeline 1 with respect to the outer shell 11, so that it can follow the radial displacement of the pipeline 1 and the joint portion 4.

Further, the earthquake-resistant structure of the present invention does not prevent the damage by increasing the strength of the joint portion of the pipeline, but has a flexible structure that follows the displacement by sliding the ring on the outer peripheral surface of the packing. As a result, members such as the outer shell 11 do not need to have an excessively large strength, and can sufficiently cope with a large displacement caused by breakage.

By holding the leaked fluid in the outer shell 11 and preventing the fluid from flowing out, a fluid flow path can be secured, and the flow path can be opened and closed by the valve 2. . This means that, despite the turmoil in the society caused by the earthquake disaster, it is possible to secure and maintain control of lifelines such as tap water and city gas, even if they are provisional.

As shown in the drawing, the outer shell 11, the ring 10 and the ring retainer 19 can be divided into a plurality of members, which can be assembled and formed outside the joint 4 in the existing pipeline system. The joint part 4 can be provided with earthquake resistance while maintaining the flow of the fluid without changing the existing pipeline system.

In general, the outer diameter of the pipe 1 has a certain standard value, but there is a certain degree of variation in the diameter due to tolerances, and furthermore, the surface state of the pipe 1 due to rust, scratches, adhesion of foreign matter, etc. Is not constant, and it is not easy to form the gasket 9 having a predetermined diameter on the outer periphery of the pipeline 1 in an airtight manner by attaching the gasket 9 molded in advance.

On the other hand, according to the invention of claim 4, by injecting and hardening the curable resin liquid into the mold assembled on the outer periphery of the conduit 1, the packing 9 is provided on the surface of the conduit 1.
Is molded and fixed, the packing 9 having a predetermined diameter can be formed irrespective of the surface condition of the pipe 1, and the packing 9 is firmly and air-tightly fixed to the pipe 1. Further, a seamless annular packing 9 can be formed on the outer periphery of the pipeline 1 while maintaining the flow of the fluid of the existing pipeline system.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view of an earthquake-resistant structure in which the present invention is applied to a pipe valve.

FIG. 2 is a perspective view of the earthquake-resistant structure of FIG.

FIG. 3 is an enlarged central longitudinal sectional view of a main part in the earthquake-resistant structure of FIG. 1 1 pipe 2 valve 3 flange joint 4 joint 9 packing 10 ring 11 shell

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Eiji Mori 3-25-5 Higashi-Osugicho, Kita-ku, Nagoya-shi, Aichi (72) Inventor Takahiro Nishiyama 8-5 Minamishosho-cho, Takatsuki-shi, Osaka (72) Inventor Katsuhiko Higashi 2-3-6 Mizuo, Ibaraki-shi, Osaka F-term (reference) 3H024 AA03 AB07 AC01 AC05 3H051 AA01 AA05 BB10 CC06 CC15 CC16 FF01 FF02 3H066 AA01 AA05 BA19

Claims (4)

[Claims] A tubular outer shell (11) is provided on the outer periphery of the joint (4) and the pipes (1) on both sides thereof so as to surround the joint (4) of the pipe (1). A packing (9) made of an elastic material is formed on the outer peripheral surface of the pipe (1), and a ring (径) having a diameter smaller than the outer diameter of the packing (9) at both ends of the outer shell (11). 10), wherein the ring (10) is tightly fitted to the outer periphery of the packing (9) while compressing the packing (9). 2. The joint (4) is provided with two conduits (1).
The seismic structure of a pipeline according to claim 1, characterized in that it comprises a valve (2) coupled to the pipe and a joint between the valve (2) and the pipeline (1). 3. The ring (10) is connected to the shell (1).
2. The seismic structure of a pipeline according to claim 1, wherein the pipeline is slidably mounted in a radial direction with respect to 1). 4. The packing (9) is cured by injecting a curable resin liquid into a mold assembled on the outer periphery of the pipe (1), and is molded and fixed to the surface of the pipe (1). The seismic structure of a pipeline according to claim 1, 2 or 3, wherein