JP2000337569A - Aseismatic joint for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture at a low cost an aseismatic joint for coupling of pipings capable of absorbing displacement of piping in the event of an earthquake and facilitate the works to couple the pipings using such a joint. SOLUTION: A flexible aseismatic joint 12 to couple together a pair of pipes 10 in such a way capable of relative displacement is composed of a flexible rubber tube 14 positioned around the two pipes 10 and extending in such a way as straddling them and an expansion part 16 which is provided on the inner surface of the rubber tube 14 and whose contacting part 34 to the outer surfaces of the pipes is made of a resilient material. A filler material 36 is encapsulated in the expansion part 16, which is thereby expanded by the pressurizing force of the filler 36 so that the contacting part 34 is put in tight attachment to the outer surfaces of the pipings 10 in such a way as capable of relative sliding, and thus the seal is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible seismic joint for connecting a pair of pipes so as to be relatively displaceable.

[0002]

2. Description of the Related Art Conventionally, in order to prevent a pipe system from being bent or broken at the time of an earthquake in water and sewage systems, agricultural waterways, dam waterways, and the like, for example, flexible parts are used in places where the stratum changes or places in soft ground. Pipes are connected using a flexible seismic joint.

FIG. 9 shows an example of this type of seismic joint for piping. In the figure, reference numeral 200 denotes a pipe, and reference numeral 202 denotes an earthquake-resistant joint for connecting the pipes 200. The earthquake-resistant joint 202 is made of a rubber tube and has a bellows portion 204, and the elasticity and flexibility are mainly ensured by the bellows portion 204.

The seismic joint 202 has a laminated structure of an inner rubber layer 206, a metal reinforcing ring 208, a fiber reinforcing layer 210, an outer rubber layer 212, and the like. It is said to be able to withstand pressure.

The seismic joint 202 is provided with fastening flanges 214 at both ends in the axial direction.
At 16, the pair of pipes 200 is connected by fastening the fastening flange 214 and the fastening flange 214 of the pipe 200 with bolts and nuts. Here, a large number of fastening holes 216 are provided at a predetermined pitch in the circumferential direction of the fastening flange 214, and the fastening flanges 214 and 214 are fastened in these many fastening holes 216 with bolts and nuts.

[0006]

However, in the case of this seismic joint 202, the bellows portions 204 are formed, and the metal reinforcing ring 20 is provided between the bellows portions 204.
8 must be buried in the inside of the cross section, and since the fastening flanges 214 need to be formed at both ends in the axial direction, the manufacturing cost as a whole becomes extremely high. The fact is that this kind of seismic joint 202 cannot be provided in all parts.

In the case of this seismic joint 202, the seismic joint 202 is connected to the front and rear pipes 20 at the time of piping work.
And the fastening hole 21 of the fastening flange 214
6, the hole must be aligned between the earthquake-resistant joint 202 and the pipe 200, which requires skill and a great deal of trouble in the construction, and has a problem that the construction is complicated and troublesome.

[0008]

The seismic joint for piping of the present invention has been devised to solve such a problem. The first aspect of the present invention is a flexible earthquake-resistant joint for connecting a pair of pipes to be connected to each other so as to be relatively displaceable, and (a) on the outer peripheral side of and over the pair of pipes. (B) a flexible rubber tube extending in the shape of a bag, and a fluid provided at an inner surface side of the rubber tube, at least a contact portion with an outer peripheral surface of the pipe is formed of an elastic material, and a fluid sealed therein. And an inflating portion which expands by a pressing force of a filler made of an elastic body to seal the contact portion so as to be relatively slidably adhered to the outer peripheral surface of the pipe so as to be sealed.

According to a second aspect of the present invention, in the seismic joint for piping according to the first aspect, the inflatable portions are provided independently at both axial ends of the rubber tube, and each inflatable portion is provided with the inflatable portion. It is characterized in that it comes into close contact with the outer peripheral surfaces of the pair of pipes in a pressurized state.

According to a third aspect of the present invention, in the seismic joint for piping according to the first aspect, the expansion portion is provided in an axial length extending over the pair of pipes, and the same expansion portion is provided in the pair. And in close contact with the outer peripheral surface of the pipe in a pressurized state.

According to a fourth aspect of the present invention, in the seismic joint for piping according to any one of the first to third aspects, the expansion portion is formed integrally with the rubber tube.

According to a fifth aspect of the present invention, in the seismic joint for piping according to any one of the first to third aspects, the expansion portion is formed separately from the rubber tube.

According to a sixth aspect of the present invention, there is provided the seismic joint for piping according to any one of the first to fifth aspects, wherein the rubber pipe is divided into two parts at an intermediate portion in the axial direction and each end on the divided side. Is provided with a fastening flange, and the fastening flanges are fastened to each other.

[0014]

As described above, the anti-seismic joint of the present invention is provided on a flexible rubber tube and its inner surface, and expands by the pressure of the filler sealed therein to expand the outer surface of the pipe. The seismic joint has a structure that has an expansion part that seals tightly and slidably against the surface of the pipe. This can be absorbed based on the flexibility, and the axial displacement can be absorbed by sliding between the outer peripheral surface of the pipe and the expanded portion.
Therefore, damage to the piping system due to bending force or axial displacement force during an earthquake can be favorably prevented.

The anti-seismic joint of the present invention does not require the provision of the bellows portion 204 unlike the conventional anti-seismic joint 202 shown in FIG. 9, and has fastening flanges 214 for fastening to piping at both ends in the axial direction. There is no need to provide them. For this reason, the earthquake-resistant joint of the present invention can be manufactured at low cost, and the cost of connecting and connecting pipes can be reduced.

Further, when connecting the pipes, it is only necessary to fit the seismic joint to the pipes. Therefore, the connection of the pipes can be performed simply and easily even by a non-expert.

In the present invention, the inflatable portions are provided independently at both ends in the axial direction of the rubber tube, and each inflatable portion is brought into close contact with the outer peripheral surfaces of the pair of pipes in a pressurized state. (Claim 2).

Alternatively, the inflatable portion may be provided with an axial length extending over the pair of pipes, and the same inflatable portion may be brought into close contact with the outer peripheral surfaces of the pair of pipes under pressure. Claim 3).

Further, in the present invention, the inflatable portion may be formed integrally with the rubber tube (claim 4), or the inflatable portion may be formed separately from the rubber tube ( Claim 5).

In the present invention, the seismic joint is divided into two parts at the axial middle part, and a fastening flange is provided on the rubber tube at each end on the dividing side. It can be made to be integrated (claim 6). In this case, the above-mentioned inflatable portions may be provided on the respective inner surfaces of the divided bodies, and the inflatable portions may be brought into close contact with the respective outer peripheral surfaces of the pair of pipes in a pressurized state.

[0021] In this case, prior to the connection of the pipes, each divided body can be attached to each of the pair of pipes in advance to expand the respective inflatable portions and to make close contact with the outer peripheral surface of the pipes. . By connecting and integrating the pair of divided bodies when connecting the pipes, the pipes can be connected to each other via the anti-seismic joint, so that the connecting operation can be easily performed.

In this case, the fastening of the fastening flanges is for fastening the seismic joints together, and is not for fastening the seismic joint 202 itself and the pipe 200 unlike the conventional seismic joint shown in FIG. Therefore, as long as the respective pipes are aligned, the divided bodies can be easily fastened.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 10 denotes a pipe, and reference numeral 12 denotes an earthquake-resistant joint of the present example for connecting the pipes 10 to each other.
The seismic joint 12 has a straight tubular flexible rubber tube 14 having a uniform cross section in the axial direction, and a pair of inflatable portions 16 provided on the inner surface side at both ends in the axial direction.

The rubber tube 14 includes an inner rubber layer 18, an intermediate rubber layer 19, a fiber reinforcing layer 20, a steel reinforcing wire 22 wound spirally, an embedded rubber layer 24, and an outer fiber reinforcing layer 26 thereof. And the outermost rubber layer 28 of the outermost layer.

The embedded rubber layer 24 is entirely or partially made of recycled rubber composed of rubber chips obtained by grinding tires. However, it is of course possible to use a normal unused rubber material. Here, the inner rubber layer 18 and the intermediate rubber layer 19 are separated from each other at the portion of the pair of inflatable portions 16 and are bonded to each other at the other portions.

The fiber reinforcing layers 20 and 26 are portions that bear pressure resistance against internal pressure.
Functions to withstand the earth pressure when the seismic joint 12 is buried in the ground. The embedded rubber layer 24 has a function of filling a portion between the reinforcing wires 22 and bonding the reinforcing wires 22 to the fiber reinforcing layers 20 and 26, the intermediate rubber layer 19, and the outer rubber layer 28. . The outermost rubber layer 28 at the outermost periphery functions to protect the inside from stones and the like when buried in the soil.

A tightening cord 30 made of a heat-shrinkable chemical fiber is partially wound around the outer side and the inner side of the pair of inflatable portions 16 at the outer side of the fiber reinforcing layer 20. ing. This is to prevent the inner rubber layer 18 and the intermediate rubber layer 19 from being separated from each other in a portion other than the expanded portion 16. In the inflatable portion 16, a release paper 32 is embedded to prevent the inner rubber layer 18 and the intermediate rubber layer 19 from being bonded to each other.

The inflatable portion 16 has a bag-like shape, and
The contact portion 34 with the outer peripheral surface of the inner rubber layer 18 is formed by the inner rubber layer 18. A filler 36 made of a fluid or an elastic body is sealed in the inflatable portion 16 under a predetermined pressurized state. The expanding portion 16 is provided with the filler 3 sealed in the pressurized state.
6, the contact portion 34 is in the expanded state.
Is elastically brought into close contact with the outer peripheral surface of the base member by the pressing force.

As the filler 36, various kinds of fluids or materials which are initially in a fluid state and react with each other after being injected into the inside of the expansion section 16 to become an elastic body can be used.
Examples thereof include a silicone sealant material, a urethane caulking material, an epoxy adhesive, and a liquid rubber. Examples of the silicone sealant material include, for example, those commercially available from Shin-Etsu Silicone Co., Ltd. under the trade name of KE42 or from Semendyne Co., Ltd. under the trade name of POS seal.

The inflatable portion 16 is provided with pipes 38 and 40 projecting axially outward so as to communicate with the inside of the bag. Here, the pipes 38 and 40 are 180
It is provided at a position separated by °. One pipe 38 is provided with a valve 42 and the other pipe 40
Is provided with a blind plug 46. Reference numeral 44 denotes an operation lever of the valve 42.

FIG. 2 shows a procedure for connecting the pipes 10 with each other using the above-mentioned earthquake-resistant joint 12. As shown in the figure, in the pipe connection method using the earthquake-resistant joint 12 of the present embodiment, as shown in FIG. (See (II) in the figure).

Thereafter, the pipes 38 and 40 in each inflation section 16 are left open, and the pipe 3
The above-mentioned filler 36 flowing into the expansion section 16 through
Inject. When the injected filler 36 starts flowing out of the pipe 40, the pipe 40 is closed with a blind plug 46, and then the filler 36 is continuously injected into the expanded portion 16 through the pipe 38 at a predetermined pressure.

Then, the expanding portion 16 is expanded by the injection pressure of the filler 36, and the contact portion 34 formed of the inner rubber layer 18 is brought into contact with the outer peripheral surface of the pipe 10 in a predetermined pressurized state. Then, the pressure in the inflation portion 16 is a predetermined pressure,
For example, when the pressure reaches a set pressure of ^{2 to 3} kgf / cm ² or more, the valve 42 is closed, and the filler 36 is sealed in the expansion section 16 (see FIG. 3 (III)).

By performing such an operation in each of the expansion portions 16 at both ends in the axial direction, the pair of pipes 10 can be connected in a sealed state via the earthquake-resistant joint 12.

The earthquake-resistant joint 12 of this embodiment is a pair of pipes 1
In the state where 0 and 10 are connected, the following operation is performed during an earthquake. That is, when a force in the bending direction is applied to the pipes 10 and 10 during an earthquake, the deformation and relative slippage of the expansion section 16 and the flexibility of the rubber pipe 14 absorbs this.

When an axial displacement force is applied to the pipes 10 and 10, the expansion portion 16 and the outer peripheral surface of the pipe 10 are relatively slipped in the axial direction as shown in FIG. It absorbs its axial displacement force. By such an action, it is possible to favorably prevent the piping system from being damaged by the displacement force during an earthquake.

In the case of the earthquake-resistant joint 12 of the present embodiment, the bellows portion 204 is formed like a conventional earthquake-resistant joint 202 shown in FIG.
It is not necessary to provide
It is not necessary to provide a fastening flange 214 for fastening with the zero. For this reason, the earthquake-resistant joint 12 of this example can be manufactured at low cost, and the cost of connecting and connecting pipes can be reduced.

As described above, in the case of the seismic joint 202 shown in FIG. 9, when connecting the pipe 200, the seismic joint 202 and the pipe 200 are strictly aligned.
With this arrangement, a number of fastening holes 216 of the piping 200 and the fastening flange 214 of the earthquake-resistant joint 202 are aligned, and
Although it is necessary to perform fastening work with a large number of bolts and nuts, this is not necessary in the case of the earthquake-resistant joint 12 of this example, and the earthquake-resistant joint 12 is simply connected to the piping 1.
0, and the filler 36 in the flowing state is added to the inflating portion 16.
It is only necessary to inject and enclose, and the work can be easily performed even by a non-expert.

It should be noted that the earthquake-resistant joint 12 of this example is also similar to that of FIG.
Can be easily manufactured as shown in FIG. That is,
As shown in FIG. 4, jigs 50 for defining the molding length of the rubber tube 14 are set at predetermined intervals in the axial direction on the outer peripheral surface of the mandrel 48, and the mandrel 48 The inner rubber layer 18 is formed by winding a tape-like rubber material around the outer peripheral surface.
Then, a pipe 38 is set on the outer side, an intermediate rubber layer 19 is formed, and a reinforcing fiber is wound around the outer peripheral surface to form a fiber reinforcing layer 20.

Further, the reinforcing wire 22 is spirally wound on the outside thereof. At this time, since a gap is generated between the reinforcing wires 22, the embedded rubber layer 24 is laminated on the outside of the fiber reinforcing layer 20 to fill the gap between the reinforcing wires 22.

In laminating the intermediate rubber layer 19, a release paper 32 is sandwiched between the inner rubber layer 18 and the intermediate rubber layer 19 at the place where the expansion section 16 is formed. In addition, at the axially outer position and the inner position of the expanded portion 16 formation location,
Tightening cord 30 made of heat-shrinkable chemical fiber
Is partially wound.

After laminating the embedded rubber layer 24, a reinforcing fiber is further wound around the rubber layer 24 to form a fiber reinforcing layer 26.
Further, an outer rubber layer 28 is wound around the outer side. Thereafter, they are put together in a vulcanization can together with the mandrel 48, and are heated and vulcanized for a predetermined time. Thereafter, the vulcanization can is taken out of the vulcanization can and the mandrel 48 and the jig 50 are removed to obtain the earthquake-resistant joint 12.

FIG. 5 shows another embodiment of the present invention.
The earthquake-resistant joint 51 of this example includes a rubber tube 52 and an inflatable portion 5.
4 are separately formed. The rubber tube 52
The cross-sectional structure is basically the same laminated structure as the rubber tube 14 of the above embodiment. On the other hand, the inflating portion 54 has a rubber bag 56, and the filler 36 is sealed inside the bag 56.

The inflatable portion 54 has substantially the same length as the rubber tube 52, that is, has an axial length extending over the pair of pipes 10 and 10, and each end in the axial direction is the outer periphery of the pipe 10. The surface is brought into close contact with the surface based on the pressing force of the filler 36.

FIG. 6 shows another embodiment of the present invention. As shown in FIG.
Has a form in which the seismic joint 12 of FIG. 1 is divided into two parts at the axial middle part. Each divided body 58A, 58B has
A fastening flange 60 is provided on the rubber tube 14 at the end on the split side, and the fastening flange 60 is
2, the bolt 64 and the nut 66 fasten each other. The other points are the same as in the embodiment of FIG.

In the case of the earthquake-resistant joint 58 of this example, FIG.
As shown in FIG. 5, the divided bodies 58A and 58B are previously mounted on the pipes 10, and when connecting the pipes 10, the fastening flanges 60 of the divided bodies 58A and 58B are bolted to the bolts 64 and the nuts 66. , The pair of pipes 10 and 10 can be connected to each other in a sealed state.

When the fastening flanges 60 are fastened to each other, the fastening holes of the fastening flanges 60 need to be aligned with each other. However, like the earthquake-resistant joint 202 shown in FIG. At the same time, it is not necessary that the core is aligned by placing it in a recess in the soil, and then the fastening hole 216 of the seismic joint 202 and the fastening hole of the pipe 200 are aligned and then fastened.

In the case of the earthquake-resistant joint 58 of this example, if the pipes 10 are aligned, the fastening holes of the fastening flange 60 can be relatively easily aligned, and the fastening operation is easy.

The embodiment of the present invention has been described in detail above, but this is merely an example. For example, in the present invention, as shown in FIG. 8, in the first embodiment, that is, in the embodiment of FIG. It is also possible to bring the outer peripheral surfaces of the pair of pipes 10 into close contact with each other. Further, in each of the embodiments shown in FIGS.
The present invention can be configured in a form in which various changes are made without departing from the gist of the invention, for example, it is possible to provide two or more expansion portions 54 and 16 in contact with each other. is there.

[Brief description of the drawings]

FIG. 1 is a diagram showing an earthquake-resistant joint according to an embodiment of the present invention in a pipe-connected state.

FIG. 2 is a diagram showing a procedure of connecting and connecting pipes by the earthquake-resistant joint of FIG.

FIG. 3 is an operation explanatory view of the earthquake-resistant joint of FIG. 1;

FIG. 4 is a diagram showing a method of manufacturing the earthquake-resistant joint of FIG.

FIG. 5 is a view showing another seismic joint of the present invention in a pipe-connected state.

FIG. 6 is a view showing still another seismic joint of the present invention in a pipe connection state.

FIG. 7 is an explanatory view of advantages of the seismic joint of FIG. 6;

FIG. 8 is a view showing still another seismic joint of the present invention in a pipe connection state.

FIG. 9 is a view showing an example of a conventional earthquake-resistant joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Piping 12,51,58 Seismic joint 14,52 Rubber pipe 16,54 Expansion part 34 Contact part 36 Filler 58A, 58B Split body 60 Fastening flange

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H104 JA07 JB02 JC09 JD01 LB28 LB36 LC04 LC07 LC15 LF16 LG02 LG22 MA08

Claims (6)

[Claims] 1. A flexible earthquake-resistant joint for connecting a pair of pipes to be connected to each other so as to be relatively displaceable,
(B) a flexible rubber tube extending on the outer peripheral side of the pair of pipes and across the pipes, and (b) forming a bag shape;
At least a contact portion provided on the inner surface side of the rubber tube and contacting the outer peripheral surface of the pipe is formed of an elastic material, and the contact portion is expanded by a pressing force of a fluid or an elastic filler filled therein. And an inflatable portion for sealing the outer peripheral surface of the piping so as to be relatively slidable and sealed. 2. The seismic joint for piping according to claim 1, wherein the inflatable portions are provided independently at both ends in the axial direction of the rubber tube, and each inflatable portion is an outer periphery of the pair of pipes. A seismic joint for piping, characterized in that it comes into close contact with the surface under pressure. 3. The seismic joint for piping according to claim 1, wherein the inflatable portion is provided with an axial length extending over the pair of pipes, and the same inflatable portion has an outer peripheral surface of the pair of pipes. A seismic joint for piping, characterized in that it is in close contact with a pressurized state. 4. An earthquake-resistant joint for piping according to claim 1, wherein said expansion portion is formed integrally with said rubber tube. 5. The earthquake-resistant joint for piping according to claim 1, wherein the expansion portion is formed separately from the rubber tube. 6. The seismic joint for piping according to claim 1, wherein the joint is divided into two parts at an axially intermediate part, and a fastening flange is provided on the rubber pipe at each end on the divided side. A seismic joint for piping, characterized in that said fastening flanges are fastened to each other.