JP4474014B2 - Seismic structure of pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention prevents a joint part such as a valve or a joint in the existing pipe line such as a gas pipe or a water pipe from being fatally destroyed when the joint part such as a valve or a joint is deformed due to an earthquake or the like. In addition, the present invention relates to a seismic device for preventing the outflow of fluid and maintaining a minimum function.
[0002]
In this specification, the term “joint portion” is not limited to a joint that joins two pipes, but includes a structure in which the pipes are joined together by means such as welding, and a plurality of pipes are directly connected. Or, a structure that is indirectly coupled through a structure such as a valve is widely referred to.
[0003]
[Prior art]
Most of the piping systems of gas pipes and water pipes are buried in the ground, but valves are installed where necessary in necessary places. These valves are normally provided in an underground manhole, and are connected to the pipe body by joints on both sides thereof.
[0004]
However, since these valves are provided in the space, the displacement due to vibration is large when an earthquake or the like occurs, and the joints provided on both sides of the valve are likely to be deformed, broken, or pulled out. When such a situation occurs, the fluid inside the valve is ejected and the flow is blocked. When such a situation occurs, there is a risk of causing a secondary disaster such as igniting the leaked gas, in particular, when the fluid is a gas, in addition to causing confusion due to the earthquake.
[0005]
As countermeasures against these, various earthquake-resistant valves that can cope with large displacements due to earthquakes have been proposed, and some effects have been recognized. Since it needs to be shut off and costs are high, it is difficult to make progress.
[0006]
Various structures have also been proposed in which the periphery of the valve is hardened and reinforced with resin, etc., but this structure is used to fix the joint so that it does not move. There is a possibility that a load exceeding the strength acts, and it is not possible to completely prevent the damage.
[0007]
Even looking at the damage status of various pipes in the Great Hanshin-Awaji Earthquake, there were many things that were damaged due to a load exceeding the assumed strength, although the structure that withstands vibration by increasing the strength of the material and rigid structure, There are many examples of flexible structures that can follow 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.
[0008]
In consideration of such circumstances, the applicants invented and filed an application for a safety device for a valve that can be constructed without interrupting the flow of fluid and can follow displacement caused by an earthquake (Japanese Patent Application No. 10-102684). , Japanese Patent Application No. 11-282271).
[0009]
[Problems to be solved by the invention]
However, these safety devices have many types of constituent members, and the structure thereof is complicated. Therefore, there is a problem that it takes time to attach all the members to the valve. Furthermore, since this safety device uses a pressure-resistant and airtight tube member made of a plastic tube or the like as an airtight member for preventing the fluid from flowing out to the outside, it is not easy to attach the valve to the valve.
[0010]
The present invention has been made in view of such circumstances, and when a joint portion such as a valve is deformed or broken due to an earthquake or the like in a pipeline, the flexible structure can reliably prevent the outflow of fluid. In particular, the purpose of the present invention is to provide a joint earthquake-resistant structure that can secure the functions of pipes and valves, has few types of constituent members, has a simple structure, and has good workability.
[0011]
[Means for Solving the Problems]
Thus, the present invention is provided on the outer periphery of the joint and the pipes on both sides thereof so as to surround the joint of the pipe including the valve coupled to the two pipes and the joint between the valve and the pipe. An outer shell made of a rigid cylindrical material is arranged, and a curable resin liquid is injected into the outer periphery of the pipe in a mold assembled to the pipe, and then cured on the surface of the pipe. forming a packing consisting of anchored elastomeric material, the both end portions of the outer shell, the ring having an outer diameter from Yaゝdiameter of the inner diameter of the packing, slidable in a radial direction relative to the outer shell The ring is tightly fitted to the outer periphery of the packing in a compressed state.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example in which the present invention is applied to a valve as a joint portion provided in a pipeline will be described based on the drawings. Reference numeral 1 is a pipe line, and 2 is a valve provided in the pipe line 1. The valve 2 and the pipe line 1 are connected by a flange joint 3. The joint part 4 in the present invention is configured.
[0015]
In the valve 2, an operation shaft 6 is erected on the operation portion 5, and a handle (not shown) is fitted to the operation shaft 6 and rotated to open and close the valve 2. It has become. Reference numeral 7 denotes an upper flange of the valve 2, and a lid plate 8 is fastened and fixed to the upper portion thereof with bolts 8 a, and the operation portion 5 protrudes above the lid plate 8.
[0016]
9 are ring-shaped packings provided on the outer peripheral surface of the pipe line 1 outside the flange joint 3 on both sides of the valve, and are firmly fixed to the outer peripheral surface of the pipe line 1.
[0017]
The packing 9 may be formed by fitting a separately molded packing to the pipe line 1 and bonding them, but a ring-shaped mold divided into a plurality of parts is assembled on the outer peripheral surface of the pipe line 1; By injecting a curable resin liquid between the pipe line 1 and the mold and then hardening, the packing 9 is molded and fixed in a ring shape along the outer peripheral surface of the pipe line 1 without interrupting the flow of the fluid. Can do.
[0018]
The material of the packing 9 is not particularly limited as long as it has rubber elasticity. However, in consideration of workability in the field, a two-component curable hard polyurethane resin is suitable, and its hardness is Shore A 60-90 is suitable. Other hard rubbers and elastomers can also be used.
[0019]
The dimensions of the packing 9 should be set as appropriate according to the space where the seismic structure is installed and the required specifications. However, the length in the tube axis direction is about the maximum amount of displacement that can occur when an earthquake occurs. Considering that it is about 100 mm, it is appropriate to set it to about 110-200 mm, and considering the amount compressed with the ring 10 mentioned later, it is appropriate that thickness is 20 mm.
[0020]
Further, a tapered tapered surface 9a is formed on the outer end of the packing 9 so that the ring 10 described later can be easily fitted when the ring 10 is pushed into the outer peripheral surface of the packing 9 and tightly fitted. preferable.
[0021]
11 is an outer shell body that supports the pressure of the fluid that leaks when the joint portion 4 is damaged, and is made of a rigid material such as metal or FRP. The outer shell 11 has a side tube portion 13 formed on the upper portion of a tubular main body portion 12 and has a substantially T-shaped tubular shape as a whole.
[0022]
The main body 12 of the outer shell 11 is divided into two parts, an upper half and a lower half, and the upper half is further divided into two parts. 1 and the joint part 4 without adding any hand, the members divided from the outside of the joint part 4 are assembled, and the cords 16 are sandwiched between the flanges 14 formed in the respective mating parts and coupled with bolts 15. By doing so, the outer shell 11 can be formed. In addition, depending on the installation condition of the joint part 4, the outer shell 11 can be subdivided into smaller members.
[0023]
A ring 10 has an inner diameter slightly smaller than the outer diameter of the packing 9 fixed to the outer periphery of the pipe 1. Although the inner diameter of the ring 10 depends on the hardness of the packing 9, it is appropriate that the inner diameter is about 5 to 10 mm smaller than the outer diameter of the packing 9.
[0024]
The ring 10 is divided into two semicircular members, and the mating surfaces thereof are hermetically sealed, and are formed into an annular shape by tightening flange pieces 17 projecting on the side surfaces with bolts 18. The Further, the inner peripheral edge of the ring 10 is formed with a tapered surface 10a that is tapered to compress the packing 9 to enhance the sealing effect and reduce resistance when the ring 10 is pushed into the outer peripheral surface of the packing 9. .
[0025]
Reference numeral 19 denotes a ring retainer for attaching the ring 10 to the outer shell body 11, which is also divided into two semicircular members like the ring 10, and the ring retainer 19 and the end of the outer shell body 11 are divided. The ring 10 is sandwiched between side flanges 20 formed in the portion and fixed with bolts 21.
[0026]
When the ring 10 is attached with the ring retainer 19, it is preferable that a slight margin is formed on the outer periphery of the ring 10 as shown in the drawing so that the ring 10 is slidable in the radial direction of the pipe line 1. The slidable range of the ring 10 is suitably about 10 to 20 mm.
[0027]
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 is divided into three or more. There is no problem.
[0028]
Thus, in order to form the outer shell 11 on the outside of the valve 2, the lower half of the outer shell is installed under the valve 2, and the upper half of the outer shell is assembled on the upper portion of the outer shell 11. The operation portion 5 of the valve 2 is projected from the tip of the side tube portion 13, the flange portion 22 formed at the upper end of the side tube portion 13 is placed on the upper flange 7 of the valve, and the lid plate 8 is placed thereon. And fix with bolts 8a.
[0029]
Then, the divided members constituting the outer shell 11 are fixed by fastening the flange 14 with bolts 15 with the string-like packing 16 sandwiched between the mating surfaces, and a substantially T-shaped outer shell on the outside of the valve 2. Form.
[0030]
Next, the ring 10 is assembled outside the both ends of the outer shell body 11, and the ring retainer 19 is assembled in a circular shape on the outer side. Then, the ring 10 is brought close to the side flange 20 of the outer shell body 11, and the packing 9 is fitted while being compressed by the tapered surface 10a on the inner peripheral edge thereof. Then, a ring presser 19 is brought into contact with the side surface of the ring 10 and tightened with a bolt 21, and the ring 10 is fixed to the outer shell 11 with its inner peripheral edge closely fitted to the packing 9.
[0031]
[Action]
In the apparatus of the present invention, the outer shell 11 is sealed by a string-like packing 16 sandwiched between the divided members, and the packing 9 and the ring 10 are closely fitted between the outer shell 11 and the pipe line 1. Thus, the outer shell 11 is kept airtight.
[0032]
In the normal state, the opening / closing operation part of the valve 2 is exposed to the outside of the apparatus and can be opened / closed. Further, when the flange joint 3 is damaged due to an earthquake or the like and the fluid leaks, the leaked fluid stops in the outer shell body 11 and does not flow out to the outside.
[0033]
Thus, when the flange joint 3 is completely destroyed due to severe earthquake motion or the like, and displacement in the pipe axis direction occurs between the pipe lines 1 on both sides, the packing 9 and the ring 10 are relative to each other in the pipe axis direction. By sliding with a natural shift, it follows the displacement, and even after sliding, the airtightness is maintained at that position, and the flexible structure provides earthquake resistance.
[0034]
In addition, a displacement in the pipe diameter direction may occur between the pipe lines 1 on both sides, but generally the displacement generated in the pipe system due to the earthquake motion is mainly in the pipe axis direction, and the displacement amount in the pipe diameter direction is small, so it is long. It can be followed by bending deformation of the pipe line 1 and the outer shell 11 in the pipe line system, and can be followed by sliding of the ring 10 by attaching the ring 10 so as to be slidable. The shell body 11 is not destroyed and fluid leakage does not occur.
[0035]
In general, when the joint portion 4 composed of the valve 2 and the flange joint 3 is destroyed by an earthquake, the portion that is most likely to be destroyed is the flange joint 3, and one of the flange joints 3 having a lower strength is destroyed. The stress is released and the other flange joint 3 is no longer destroyed.
[0036]
Accordingly, the valve 2 in a state in which the flange joint 3 is damaged is held via the flange joint 3 with respect to either one of the pipes 1 , and the fluid flowing out from the damaged flange joint 3 is contained in the outer shell body 11. The flow path through the valve 2 is secured, and the flow path can be opened and closed by operating the valve 2 as long as the valve 2 is not destroyed.
[0037]
【The invention's effect】
Therefore, according to the present invention, when the joint portion 4 of the pipe line 1 is broken due to a severe earthquake or the like, the pipe line 1 is broken by sliding the packing 9 and the ring 10 while maintaining airtightness. Therefore, the fluid leaking from the broken joint portion 4 does not flow out to the outside following the displacement.
[0038]
Further, according to the present invention, the ring 10 can slide in the radial direction of the pipe line 1 with respect to the outer shell body 11, and therefore follows the radial displacement between the pipe line 1 and the joint portion 4. can do.
[0039]
The seismic structure of the present invention does not prevent breakage by increasing the strength of the joint portion of the pipeline system, but has a flexible structure that follows displacement by sliding the ring on the outer peripheral surface of the packing. Therefore, the member such as the outer shell body 11 does not need to have an excessively large strength, and can sufficiently cope with a large displacement caused by breakage.
[0040]
The fluid leaked in the outer shell body 11 is retained to prevent the fluid from flowing out, whereby a fluid flow path can be secured, and the valve 2 can be opened and closed. This means that it is possible to secure and maintain lifelines such as tap water and city gas even in the midst of a major social disruption caused by earthquake disasters.
[0041]
Further, as shown in the drawings, the outer shell body 11, the ring 10 and the ring presser 19 can be divided into a plurality of members and assembled and formed outside the joint portion 4 in the existing pipeline system. The seismic resistance can be imparted to the joint portion 4 while maintaining the fluid flow without modifying the pipeline system.
[0042]
In general, the outer diameter of the pipe 1 has a certain standard value, but there is a variation in diameter due to a certain degree of tolerance, and the surface of the pipe 1 has a constant state due to rust, scratches, foreign matter, etc. In other words, it is not easy to form the packing 9 having a predetermined diameter on the outer periphery of the pipe 1 in an airtight manner by attaching the packing 9 molded in advance.
[0043]
On the other hand, according to the present invention, the packing 9 is integrally molded and fixed to the surface of the pipe line 1 by injecting a curable resin liquid into a mold assembled on the outer periphery of the pipe line 1 and curing it. since it is, it is possible to form a packing 9 irrespective predetermined diameter on the surface state of the pipe 1, the packing 9 is fixed to firmly and hermetically against conduit 1. Further, a seamless annular packing 9 can be formed on the outer periphery of the pipe line 1 while maintaining the fluid flow of the existing pipe line system.
[Brief description of the drawings]
1 is a longitudinal cross-sectional view of a seismic structure in which the present invention is applied to a valve of a pipeline; FIG. 2 is a perspective view of the seismic structure of FIG. 1; Figure 1 Pipe line 2 Valve 3 Flange joint 4 Joint part 9 Packing 10 Ring 11 Outer shell

Claims (1)

The joint (4) of the pipe (1) including the valve (2) coupled to the two pipes (1) and the joint of the valve (2) and the pipe (1). An outer shell body (11) made of a cylindrical rigid material is disposed on the outer periphery of the portion (4) and the pipe lines (1) on both sides thereof, and the pipe line (1) is placed on the outer peripheral surface of the pipe line (1). ) Is injected into a mold assembled into a mold and cured to form a packing (9) made of an elastic material molded and fixed to the surface of the pipe (1), and the outer shell (11). at both ends of) the packing (9) ring (10) having more Yaゝdiameter inner diameter outer diameter, slidably provided the outer shell relative to (11) in the radial direction, the ring ( 10) is tightly fitted to the outer periphery of the packing (9) in a compressed state with the packing (9) compressed.

Images