JP2001099382A - Safety device for valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety device capable of preventing outflow of fluid by a flexible structure when couplings on both sides of a valve is broken by an earthquake, sufficiently standing pressure even when large pressure is applied at a stroke temporarily securing a flow passage and securing the function of the valve. SOLUTION: A valve 2 of an existing conduit and the outside of couplings 3 on both the sides are wrapped and covered with flexible withstand pressure airtight tube members 12, 15. Both side ends of the withstand pressure airtight tube members 12, 15 are airtightly mounted on an outer periphery of a pipe body 1. An operation part 17 of the valve 2 is passed through wall surfaces of the withstand pressure airtight tube members 12, 15 and is exposed to the outside. A substantially T-pipe shaped outer shell body 25 is fitted into the outside of the withstand pressure airtight tube members 12, 15. A terminal of a side pipe part 27 of the outer shell body 25 is set around the operation part 17 of the valve 2 together with withstand pressure airtight tube members 12, 15.

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, which prevents a fluid from flowing out when a valve in the pipeline is deformed due to an earthquake or the like. The present invention relates to a safety device for maintaining functions.

[0002]

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. Usually, the valve is installed in an underground manhole, and is connected to a pipe by joints on both sides thereof.

[0003]

However, since these valves are provided in a space, they are largely displaced by vibrations in the event of an earthquake or the like, and the joints provided on both sides of the valves are deformed, broken, come out, etc. Tends to occur. When these situations occur, the internal fluid is ejected, and the flow is interrupted.

[0004] If such a situation occurs in an emergency such as an earthquake, the situation may be disrupted by the earthquake, making it difficult to take appropriate measures, and in the case of gas, in particular, igniting the leaked gas, etc. There is also a danger of disaster.

[0005] Conventionally, various anti-seismic valves have been proposed which can cope with large displacements caused by an earthquake or the like, and a certain effect is recognized. However, in order to exchange these valves, it is necessary to exchange the valves. In this case, the flow of the fluid must be cut off, and the cost is high.

As disclosed in Japanese Patent Application Laid-Open Nos. 9-89188 and 57-116992, it has been proposed to fix joints on both sides of a valve with resin to prevent breakage. However, such a structure fixes the joint so that it does not move.If a large vibration is encountered due to an earthquake or the like, a load exceeding the strength may be applied, and it is impossible to completely prevent damage. Can not.

[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.

In consideration of such circumstances, the present inventors have invented a safety device having a flexible structure capable of following a displacement caused by an earthquake, and filed an application as Japanese Patent Application No. 10-102684. This can be installed without interrupting the pipeline system,
In addition, the flexible structure can prevent the outflow of fluid, and is extremely effective for relatively small valves. When the joint 3 is destroyed instantaneously and a large pressure is applied at once, there is a possibility that the joint 3 cannot withstand sufficiently.

The present invention has been made in view of such circumstances, and when a valve or a joint on both sides of the valve is destroyed by an earthquake or the like, a fluid is prevented from flowing out by a flexible structure, and a large pressure is applied at once. It is an object of the present invention to provide a safety device that can sufficiently withstand such a case and secures the flow path and the function of the valve, though provisionally.

[0010]

According to the present invention, the outside of a valve of an existing pipeline and joints on both sides thereof are covered with a flexible pressure-resistant airtight tube member, and both ends of the pressure-resistant airtight tube member are piped. Airtightly attached to the outer periphery of the body, the valve operating portion is exposed to the outside through the wall surface of the pressure-resistant airtight tube member, and a substantially T-shaped outer shell is fitted to the outside of the pressure-resistant airtight tube member. The end of the side tube portion of the outer shell is fixed around the operation portion of the valve together with the pressure-resistant airtight tube member.

In the present invention, the pressure-resistant airtight tube member is a plastic tube having an airtight property in which a plastic sheet is wound around a valve of an existing pipeline and joints on both sides thereof and both ends thereof are joined. And a tubular reinforcing fabric in which the fabric is wound around the outside of the plastic tube to overlap both ends.

In this structure, a cover fabric is further wound around the tubular reinforcing fabric and both edges thereof are joined to form a tubular cover fabric, and both ends of the tubular cover fabric are pressure-tight and airtight. The operating portion of the valve is attached to the outer periphery of the tubular body together with the tube member, and penetrates the wall surface of the tubular cover fabric to expose the operating portion of the valve. And it is preferable to be fixed together with the outer shell.

Further, in the present invention, side flanges are attached to the outer periphery of the pipe body at two places across the valve of the existing pipeline and the joints on both sides thereof, and both side ends of the pressure-resistant airtight tube member are attached to the side flanges. Is preferably attached. Further, in this structure, it is preferable that the side flange is formed by assembling and combining a plurality of divided flange members on the outer periphery of the tube.

In the present invention, a plurality of divided support rings are fitted to the outer periphery of the tube outside the side flange, and a plurality of divided ring-shaped members are provided between the support ring and the tube. It is preferable that a wedge is fitted to form a stopper, and that the stopper supports a force directed to the side of the side flange.

The length of the pressure-resistant airtight tube member in the pipe length direction is larger than the distance between the mounting positions of the pressure-resistant airtight tube member with respect to the tube, and the pressure-resistant airtight tube member is slackened relative to the tube. Preferably it is attached.

Further, in the present invention, an upper flange is formed on the outer periphery of the operation portion of the valve, and the operation portion of the valve is inserted into a through hole formed in the wall surface of the pressure-resistant airtight tube member. It is desirable that a flange formed at the tip of the side tube portion of the outer shell be airtightly fixed to the upper flange.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. The drawings show one embodiment of the present invention, in which 1 is a pipe constituting an existing pipeline, and 2 is a pipe.
Is a valve provided between the pipes 1, and the pipe 1 and the valve 2 are connected to each other by a flange joint 3. Reference numeral 4 denotes a working branch pipe.

Reference numeral 5 denotes a pair of side flanges respectively attached to the pipes 1 on both sides of the valve 2 and the flange joint 3. As shown in FIG. 3, the side flange 5 sandwiches the tubular body 1 with a pair of semicircular flange members 6 and assembles them into a circular shape and connects them.
The mating surface of the flange member 6 is hermetically sealed by a seal member 7. In the drawing, the flange member 6 is formed by combining two semicircular members, but may be formed by dividing a circle into three or more.

On the outer periphery of the side flange 5, a slightly tapered tapered surface 8 is formed.
A taper ring 10 having a tapered surface 9 formed on the inner surface is fitted on the outer side of the shaft, and the side flange 5 and the tapered ring 10 are tightened with bolts 11 so that a plastic described later is formed between the tapered surfaces 8 and 9. Tube 12
Is to be clamped.

The tapered ring 10 is also formed by combining two (or three or more) semicircular ring members 13 like the side flange 5 to form the circular tapered ring 10. Make up.

A half fastening ring 14 is fitted to the outside of the tapered ring 10 and tightened to form a cylindrical reinforcing cloth (described later) between the fastening ring 14 and the outer surface of the tapered ring 10. 15 and the tubular cover fabric 16 are pressed and fixed.

On the other hand, in the existing valve 2, an operation shaft 18 is provided upright on an operation portion 17 thereof.
The valve 2 is opened and closed by fitting and rotating a handle (not shown). A cap 19 is fitted to the operation section 17.

Reference numeral 20 denotes an upper flange of the valve 2, on which a cover plate 21 is fixed by tightening bolts 22, and the operation portion 17 is protruded from the upper portion of the cover plate 21. I have.

Reference numeral 12 denotes a plastic tube. The plastic tube 12 is made of a flexible air-tight plastic sheet, and a through hole formed in a part of the plastic sheet is fitted into the operating portion 17 of the valve 2. It is wound around the outside of the flange joint 3 and both edges thereof are joined to form a cylindrical plastic tube 12.

Then, both ends of the plastic tube 12 are fitted to the tapered surface 8 of the side flange 5 as described above, and a tapered ring 10 is assembled on the outer periphery thereof, and tightened with a bolt 11 so as to be between the tapered surfaces 8 and 9. The plastic tube 12 is pressed and fixed airtight. At this time, it is preferable that the plastic tube 12 be sufficiently longer than the distance between the side flanges 5 and be wound around the outside of the bulb 2 with the plastic tube 12 loose.

A tubular reinforcing cloth 15 is formed outside the plastic tube 12. The tubular reinforcing cloth 15 is made of a high-strength cloth such as a woven cloth, and a through-hole is formed in a part thereof. The through-hole is fitted into the operating section 17 of the valve 2, and the cloth is connected to the plastic tube 12. , And both edges thereof are largely overlapped to form a cylindrical reinforcing cloth 15. Then, both ends of the plastic tube 12 are connected to the tapered ring 1.
0.

A tubular cover fabric 16 is formed outside the tubular reinforcing fabric 15. Cylindrical cover fabric 16
Is also made of a cloth such as a woven cloth, and a through-hole is formed in a part of the cloth, and the through-hole is fitted to the operating portion 17 of the valve 2. Then, the fabric is wound around the outside of the tubular reinforcing fabric 15, and both edges thereof are joined by being sandwiched by a pressure plate 23 and fastened with bolts 24 as shown in FIG. 16 are formed.

Reference numeral 25 denotes an outer shell, which is a tubular main body 26.
A side tube portion 27 is formed at an upper portion of the main body, and has a substantially T-shaped tubular shape. The main body portion 26 is divided in half in the axial direction and is divided into an upper half portion 28 and a lower half portion 29.

An outer shell 25 is assembled between the upper half 28 and the lower half 29 from outside the tubular cover fabric 16 with the valve 2 and the side flange 5 interposed therebetween.
7 is made to protrude from the tip of the side tube portion 27, and the upper half 28 and the lower half 29 are fastened and fixed by bolts 30.

The peripheries of the through holes of the plastic tube 12, the tubular reinforcing fabric 15, and the tubular cover fabric 16 are placed on the upper surface of the flange 20, and the outer shell 25 is placed thereon.
The flange portion 27a formed on the upper end of the side tube portion 27 is overlapped, sandwiched by the lid plate 21 from above, and fastened with bolts 22 to fix each member.

Both ends of the tubular reinforcing fabric 15 and the tubular cover fabric 16 are fitted around the outer periphery of a tapered ring 10 fixed to the side flange 5, and are fixed by tightening with a tightening ring 14 from outside. ing. Both ends of the main body 26 of the outer shell 25 cover the outside of the fastening ring 14.

At this time, the tubular reinforcing fabric 15 and the tubular cover fabric 16 used are sufficiently longer than the distance between the side flanges 5 as in the case of the plastic tube 12, and are slackened in the length direction. It is preferable to make it wrapped around the outside of the valve 2 so that it can follow the displacement at the time of deformation.

Reference numeral 31 denotes a stopper attached to the tube 1 on the side of the side flange 5. The stopper 31 has a plurality of divided support rings 33 each having a tapered surface 32 formed on an inner surface thereof, and the outer peripheral surface fitted to the tapered surface 32 fitted between the support ring 33 and the tube 1. A ring-shaped wedge 35 is formed by forming a tapered surface 34 and divided into a plurality of parts.
The stopper 31 is firmly fixed to the tubular body 1 by fitting between the tubular body 3 and the tubular body 1 and fastening with the fastening bolts 36.

Numeral 37 denotes a spacer mounted on the outer surface of the tube 1 between the stopper 31 and the side flange 5. When a force acting on the side flange 5 in the lateral direction is applied thereto, the spacer 37 is used. It is transmitted to the stopper 31 and the side flange 5
Is supported and stopped by the stopper 31.

[0035]

In the present invention, the plastic tube 1
2. A tubular reinforcing fabric 15, a tubular cover fabric 16, and an outer shell 25 surround the valve 2 and the flange joints 3 provided on both sides of the valve 2, and the operating portion 17 of the valve 2 , The valve 2 can be opened and closed by fitting the handle to the operating shaft 18 and operating as needed, in a normal use state, and the normal valve function is impaired. There is no.

A rigid outer shell 25 is provided at the outermost part of the safety device of the present invention, and protects the inner flexible structure. Reinforcement fabric 15 and tubular cover fabric 16
Can be maintained for a long time without being damaged.

Then, it receives a large vibration due to an earthquake or the like,
When the flange joint 3 is deformed, the fluid leaking from the deformed portion is held in the plastic tube 12 and the pressure is supported by the tubular reinforcing fabric 15 and the tubular cover fabric 16, and a larger pressure is applied. Although not permanent, large-scale outflow of fluid is prevented because the shell 25 supports it when activated.

Further, even when a large external force is applied due to the destruction of an external structure due to an earthquake, the rigid outer shell 25 supports and protects the external force.
The tubular reinforcing fabric 15 and the tubular cover fabric 16 are not damaged or broken, and the function as a safety device is not impaired.

If the flange joint 3 is damaged by a large vibration, only one of the two flange joints 3 provided on both sides of the valve 2 having relatively low strength is damaged, and if it is broken, the other one is broken. There is no longer a large force acting on the flange joint 3 and it is not damaged.

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 as described above. Since it is held in the plastic tube 12, a flow path from the pipes 1, 1 through the valve 2 is secured, and the flow path can be opened and closed by the valve 2.

In the above description, the plastic tube 12 and the tubular reinforcing fabric 15 are described as being separate from each other. However, the tubular reinforcing fabric 15 is lined to be airtight, and both edges thereof are airtight. And the plastic tube 12 and the tubular reinforcing fabric 15 can be made into an integral pressure-resistant airtight tube member.

However, it is difficult to air-tightly join both edges of the sheet-like material while having sufficient strength, and the plastic tube 12 for ensuring air-tightness and the tubular reinforcing cloth 15 for maintaining pressure resistance are required. By separating them, sufficient airtightness and pressure resistance can be ensured.

Further, in the present invention, since the outer shell 25 having high strength is provided at the outermost part, the cylindrical cover fabric 16 is not always necessary, but the pressure-resistant airtight tube composed of the plastic tube 12 and the cylindrical reinforcing fabric 15 is provided. Since the members may be damaged or deteriorated with the passage of time, they may not be able to perform their functions sufficiently in an emergency, so to protect them and further increase the pressure resistance, use a pressure-resistant airtight tube member. It is preferable to provide the tubular cover fabric 16 on the outside.

The outer shell 25 is made of a rigid material, and is preferably made of metal. However, a material having high strength such as FRP can also be used.

When the flange joint 3 is deformed due to a large earthquake or the like, a considerably large displacement may occur. Therefore, as described above, the plastic tube 12, the tubular reinforcing fabric 15, and the tubular cover fabric 16 are provided with the same. It is preferable that the attachment is performed with a slack in the length direction. The magnitude of the slack depends on the magnitude of the expected displacement,
cm or more is appropriate.

The fabric constituting the tubular reinforcing fabric 15 may be a flat fabric, but it is preferable to use a fabric having a different diameter such that both ends are tapered when formed into a tubular shape. By adopting such a shape, unnecessarily large wrinkles do not occur in a state wound around the valve 2, the tightening by the tightening ring 14 is ensured, and a large internal pressure can be endured.

According to the above description, since the spacer 37 is mounted on the surface of the tubular body 1 on the side of the side flange 5 and the stopper 31 is provided on the side, the pressure of the leaked fluid causes When a lateral force acts on the side flange 5, the stopper 31 supports the force and prevents the lateral movement of the side flange 5.

The structure of the stopper 31 is as follows.
The support ring 33 divided into a plurality of pieces is fitted to the outside of the pipe, and the ring-shaped wedge 35 divided into a plurality of pieces is fitted between the support ring 33 and the tubular body 1.
Since a large frictional force acts between the tube 5 and the tube 1 and the frictional force is further increased by pushing the support ring 33 to the side, the displacement of the side flange 5 can be reliably supported.

In order to prevent the relative movement between the side flange 5 and the tube 1, the side flange 5 can be fixed to the tube 1 with a bolt or the like. Etc. may break and the movement may occur,
Further, it is not preferable because the strength of the tubular body 1 may be reduced by the bolt holes.

In the Japanese Patent Application No. 10-102684, a large number of reinforcing plates are bonded to the tube 1 to support the load applied to the side flange 5, but when a high fluid pressure is applied. The reinforcing plate may peel off from the tube 1 and may not be able to sufficiently support the side flange 5.

In the above description, the side flange 5, the taper ring 10 and the tightening ring 14, the outer shell 25, and the stopper 31 associated therewith are assembled on the outer periphery of the tube 1 by dividing into a plurality. Plastic tube 12, tubular reinforcing cloth 1
5 and the tubular cover fabric 16 are formed by winding a sheet-like material, so that the safety device of the present invention can be formed for the valve 2 while allowing fluid to flow through the pipeline.

[0052]

Therefore, according to the present invention, even when the joints on both sides of the valve are deformed due to an earthquake or the like, the pressure-resistant airtight tube member follows the displacement accompanying the earthquake due to its flexible structure,
In addition, it prevents outflow of the fluid leaking from the deformed portion and sufficiently withstands a large fluid pressure with a large valve, and provisionally secures a flow path and also functions of the valve. be able to.

Therefore, there is no large-scale outflow of fluid that would cause confusion due to an earthquake or the like, and the work of restoring the damaged part can be performed again after avoiding the confusion for the time being. is there.

Further, the present invention does not prevent the damage by increasing the strength of the joint, but follows the displacement when the joint is broken by the flexible structure, so that it is not necessary to have an unnecessarily large strength. Can sufficiently cope with a large displacement caused by the above.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view showing an embodiment of a valve safety device according to the present invention.

FIG. 2 is an enlarged central longitudinal sectional view of a main part of the safety device of FIG. 1;

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tube 2 Valve 3 Flange joint 5 Side flange 6 Flange member 12 Plastic tube 15 Cylindrical reinforcing cloth 16 Cylindrical cover cloth 17 Operation part 20 Upper flange 25 Outer shell 26 Main part 27 Side pipe part 27a Flange part 31 Stopper 33 Support ring 35 Wedge

Continued on the front page (71) Applicant 592153953 Nabeya Industry Co., Ltd. 3-25-5 Higashi-Osugicho (72) Inventor Takahiro Nishiyama 8-5 Minamishosho-cho, Takatsuki-shi, Osaka (72) Inventor Katsuhiko Higashi 2-3-6 Mizuo, Ibaraki-shi, Osaka (72) Inventor Taichi Okamoto Gifu 36, Gotanda-cho, Gifu-shi F term (reference) 3H025 EA03 EB25 EC05 EC15 ED03 3H051 BB03 BB10 CC11 CC12 CC14 CC15 FF02

Claims (8)

[Claims] The outside of a valve (2) of an existing pipeline and a joint (3) on both sides of the existing pipeline is made of a flexible pressure-resistant airtight tube member (1).
2, 15), and the pressure-resistant airtight tube member (1)
2, 15) are hermetically attached to the outer periphery of the tube (1), and the operating part (17) of the valve (2) is exposed to the outside through the wall surface of the pressure-resistant airtight tube member (12, 15). A substantially T-shaped outer shell (25) is fitted to the outside of the pressure-resistant airtight tube member (12, 15), and the outer shell (2) is fitted.
5) The end of the side tube part (27) is connected to the operating part (17) of the valve (2) together with the pressure-resistant airtight tube member (12, 15).
Safety device characterized by being fixed around the valve 2. The pressure-resistant airtight tube member (12, 1).
5) an airtight plastic tube (12) which is formed by wrapping a plastic sheet around the valve (2) of the existing pipeline and the joint (3) on both sides thereof and joining both edges thereof to form a tubular shape; The plastic tube (12)
The valve safety device according to claim 1, comprising a tubular reinforcing fabric (15) in which a fabric is wound around the outside of the tube and both ends of the fabric are overlapped. 3. A tubular cover fabric (16) is formed by further wrapping a cover fabric on the outside of the tubular reinforcing fabric (15) and joining both edges thereof, and forming the tubular cover fabric (1).
6) are mounted on the outer periphery of the tubular body (1) together with the pressure-resistant airtight tube members (12, 15), and penetrate the wall surface of the tubular cover fabric (16), and operate the operating section (5) of the valve (2). 17) is exposed, and the operation unit (1) of the valve (2) is exposed.
7) around the tubular cover fabric (16), the pressure-resistant airtight tube member (12, 15) and the outer shell (2).
3. The method as claimed in claim 2, wherein the fixing step is carried out together with 5).
Safety devices for valves described in 4. A side flange (5) is attached to an outer periphery of a pipe body (1) at two locations across a valve (2) of an existing pipeline and a joint (3) on both sides thereof. The pressure-resistant airtight tube member (12, 1
5) characterized in that both ends are attached.
The valve safety device according to claim 1, 2, or 3. 5. The side flange according to claim 4, wherein the side flange is formed by assembling a plurality of divided flange members around an outer periphery of a tubular body. Safety device for the described valve (2) 6. A plurality of divided support rings (33) are fitted around the outer periphery of the tube (1) outside the side flange (5), and the support ring (33) and the tube (1) are connected to each other. A ring-shaped wedge (35) divided into a plurality of pieces is fitted to form a stopper (31), and the stopper (31) supports a force directed to the side of the side flange (5). The valve safety device according to claim 4 or 5, wherein 7. The pressure-resistant airtight tube member (12, 1).
5) The length in the pipe length direction is larger than the distance between the mounting positions of the pressure-resistant airtight tube member (12, 15) with respect to the pipe (1), and the pressure-resistant airtight tube member (12, 15) is used.
7. The valve safety device according to claim 1, wherein the valve body is attached to the tube body in a loose state. 8. An operation part (17) of the valve (2) is formed with an upper flange (20) on an outer periphery thereof, and the operation part (17) of the valve (2) is connected to a wall surface of the pressure-resistant airtight tube member (12, 15). The flange (27a) formed at the periphery of the through hole and at the tip of the side tube (27) of the outer shell (25) is inserted into the upper flange (20). The safety device for a valve according to any one of claims 1 to 7, wherein the safety device is airtightly fixed.