JPH0544885A - Fitting repairing method - Google Patents

Abstract

PURPOSE:To enable fitting repairing work in a small space and to facilitate and ensure repairing of a flange fitting in the varied shape and dimension. CONSTITUTION:Outer circumferential faces of abutted flanges 4 are surrounded by a rubber belt 6 and a steel belt 7 is wound around the circumferential part for fastening. A sealant 9 is pressed in between the abutted flanges 4 through this rubber belt 6 till the sealant 9 is leaked from a hole of a bolt 6 which couples the flanges to each other so as to prevent leakage of a fluid 3 in the pipe at a flange fitting 2 of a fluid conductor 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The pipe joint repairing method of the present invention relates to a pipe joint repairing method for preventing leakage of fluid in a pipe at a flange joint portion of a fluid conduit. At that time, the present invention relates to a pipe joint repairing method for preventing leakage of a fluid flowing therein without changing the internal pressure of the pipe.

[0002]

2. Description of the Related Art Conventionally, this kind of pipe joint repairing method considers a measure for preventing fluid leakage in the pipe from the flange joint portion in a large range, and extends to a part of the pipe before and after the flange joint portion in the longitudinal direction of the fluid conduit. A joint cover was provided to carry out the method. As an example thereof, the joint section cover is divided into two as the joint section cover at a surface including the axis of the fluid conduit, and in a state where each of the divided surfaces and the cover is assembled, a sealing treatment is applied to a surface in contact with the fluid conduit. A part of the fluid conduit to which the flange is attached and the flange joint part are provided in a wrapped form, and the joint part covers are connected to each other by bolts,
There was a pipe joint repair method to prevent fluid leakage.

[0003]

PROBLEM TO BE SOLVED BY THE INVENTION The leakage of fluid in the pipe from the target flange joint portion is caused mainly by deterioration of the seals and packings provided on the flange abutting surfaces.
Since this is because the deterioration of the sealing property, how to treat the flange abutting surface is important for repairing the pipe joint.

The above-mentioned conventional pipe joint repair method inevitably adopts a method of providing a joint portion cover that encloses a part of the fluid conduit to which the flange is attached in addition to the flange abutment surface, and therefore the joint portion cover is inevitably included. Is too large to fit in a pipe joint in a narrow space and makes repair work extremely difficult.

The shape and dimensions of the joint cover are as follows.
Considering that the shape and dimensions of the target pipe joint repair part vary depending on the site, it is necessary to make and prepare various types of joint part covers that meet those conditions, which is very troublesome. At the same time, there is a drawback that the economy is low.

Further, the pipe portion to which the flange is attached is
If it is composed of a member with a complicated shape such as a valve, it is not possible to manufacture the above-mentioned joint cover according to the shape, so as another method of pipe joint repair, disassemble and repair the flange and fluid conduit together. I had to take a very large-scale approach.

In view of the above-mentioned drawbacks, an object of the present invention is to provide a pipe joint which can easily carry out repair work in a narrow space and can easily and surely deal with repair of flange joint portions of various shapes and sizes. It is in the area of providing repair methods.

[0008]

The characteristic means of the present invention for attaining this object is to enclose a rubber belt on the outer peripheral surface of abutted flanges and wrap the peripheral portion with a steel belt to fasten the rubber belt. The sealing material is injected under pressure between the flanges abutted against each other, and the sealing material is injected under pressure until it leaks from the hole of the bolt connecting the flanges.

[0009]

According to the above characteristic means, the rubber belt is surrounded by the outer peripheral surfaces of the abutted flanges, and the peripheral portion thereof is wound by the steel belt and fastened, whereby the rubber belt is attached to the peripheral portion of the flange. The peripheral portion of the flange abutting surface, which is one of the portions through which the fluid inside the fluid conduit leaks due to close contact, is reliably packed.

Further, after that, a sealing material is injected under pressure between the flanges abutted through the rubber belt, and the sealing material is injected under pressure until it leaks from a hole of a bolt connecting the flanges. The gap between the flanges is filled with the sealing material,
By leaking the sealing material from the hole of the bolt, it can be confirmed that the sealing material is surely filled in the gap.

On the other hand, the processing of the rubber belt is performed by simply cutting it into a length corresponding to the flange circumference of the joint to be repaired, and no special processing is required. There is no need to create and prepare repair parts.

The rubber belt and the steel belt are installed only on the outer peripheral surface of the flange and are unrelated to the shape of the pipe adjacent to the joint portion. Moreover, unlike the joint cover used in the conventional repair method described above, a large mounting space is not required, and therefore repair can be performed in a place with a small space.

[0013]

According to the pipe joint repairing method of the present invention, therefore, repairs can be performed in a narrow space, and flange joints of any size can be easily and surely dealt with without any trouble and economical. I was able to repair it.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a situation in which a flange joint portion 2 of a gas pipe 1 which is an example of a fluid conduit is repaired so as to prevent leakage of a fluid 3 in the pipe.

In the repairing method of the present invention, in the flange joint portion 2 in which the abutted flanges 4 are connected to each other by bolts 5, the outer peripheral surface of the flange 4 is first provided with the rubber belt 6 cut in accordance with its peripheral length. , The flange abutment surface 4a is surrounded by the rubber belt 6 and the steel belt 7 is attached to the flange abutment surface 4a.
Wrap each on both sides of the sandwich and tighten with a tightening tool.

Next, the flange 4 abutted through the injection hole 8 provided at the lower position of the flange joint portion 2 at a substantially central position in the width direction of the rubber belt 6.
In the meantime, the sealing material 9 is injected under pressure by the injection machine P. The sealing material 9 is injected at a pressure approximately higher than the gas pressure in the pipe by about 2 kg / cm 2, and is continuously performed until the injected sealing material 9 leaks from the bolt hole 10 on the side surface of the flange 4. This serves as an index for confirming the situation in which the sealing material 9 is being filled between the abutted flanges 4, and the sealing material 9 leaking from the bolt hole 10 is hardened and the viscosity is increased to increase the elasticity. Since the property is improved and the bolt hole 10 is closed, the leakage is stopped.

On the other hand, in addition to the injection hole 8, the rubber belt 6 is provided with an air vent hole 11 at a position facing the injection hole 8 on the outer peripheral surface 4b of the flange, and during the injection of the seal material 9. , The gas stored between the abutted flanges 4 is pushed out of the joint portion 2 through the vent hole 11,
Finally, like the bolt hole 10, the sealing material 9
It is possible to know the end of filling by leaking.

In this way, the sealing material 9 at the joint portion 2
When the injection is completed, the injection hole 8 and the vent hole 11 are closed, and an aluminum collar (not shown) is installed on the peripheral surface for the purpose of protecting the outer peripheral surface of the repaired part, and the repair is completed. is there.

Next, FIG. 2 shows details of the flange joint portion 2 repaired by the pipe joint repairing method of the present invention.

An example of the rubber belt 6 surrounding the flange outer peripheral surface 4b of the pipe joint will be described below. A large groove portion 13 is provided on one surface in the middle of the width direction over the entire length, and on the back surface of the one surface, Small groove portions 14 are provided at both ends in the width direction over the entire length, and the flange outer peripheral surface 4b is surrounded with the large groove portion 13 inside. A sealing material 9 filling space 15 surrounded by the large groove portion 13 and the flange outer peripheral surface 4b,
And the packing part 16 between the butted flanges 4,
It becomes a target space for injecting the sealing material 9, and the small groove portion 14 is
It is provided as a guide for preventing the steel belt 7 from coming off from the rubber belt 6 when the steel belt 7 is wound and tightened.

Further, since the rubber belt 6 has a portion having a different role in its shape, the material of the rubber is made different for that role. First, the two protruding portions 17 of the large groove portion 13 which are located on the inner side in a state of surrounding the flange 4 and are in contact with the flange 4 are made of a relatively soft material in order to improve the close contact with the flange outer peripheral surface 4b. Since the bottom portion 18 of the large groove portion 13 that constitutes the outer portion is made of rubber and is similarly surrounded, the bottom portion 18 of the large groove portion 13 is made of a relatively hard material for the purpose of protection because it does not come into contact with other things outside. It is built.

Further, the rubber constituting the bottom portion 18 of the large groove portion 13 is integrally formed so as to wrap the reinforcing nylon fiber 19 therein, and is exposed to the outside while the flange 4 is surrounded. The same nylon fiber on the surface 19
Is coated.

Further, a screw washer 20 for forming a female screw for both the injection hole 8 and the vent hole 11 is embedded in the bottom portion 18 of the large groove portion 13. The screw washer 20 is provided with a flange-shaped protrusion 20a on its periphery to prevent the screw washer 20 from coming off. When the injection hole 8 and the vent hole 11 formed by the screw washer 20 are closed, a male screw (not shown) that is screwed into a female screw of the screw washer 20 can be screwed. ..

On the other hand, the sealing material 9 is made of a two-liquid mixing type special resin, and when the sealing material 9 is cured, it becomes a rubber-like elastic body, and a curing rate is adjusted by adding a catalyst. It can be adjusted arbitrarily.

[Other Embodiments] The pipe joint repairing method of the present invention comprises:
Besides being applied to the leakage prevention of the in-pipe fluid 3 at the flange joint portion 2 of the fluid conduit described in the previous embodiment, it also effectively acts to prevent the leakage of the fluid 3 at the pipe portion of the fluid conduit,
The target fluid conduit and the fluid 3 flowing therein are not limited to those in the above-described embodiment, but can be applied to any target of liquid or gas.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Fig. 1] Flange joint repair status diagram

[Fig. 2] Detailed view of joint

[Explanation of symbols]

 1 Fluid conduit 2 Joint part 3 Fluid in pipe 4 Flange 5 Bolt 6 Rubber belt 7 Steel belt 9 Sealing material 10 Hole

Claims (1)

[Claims] 1. A flange joint portion (2) of a fluid conduit (1)
A method of repairing a pipe joint for preventing fluid (3) from leaking in a pipe, wherein a rubber belt (6) is surrounded by an outer peripheral surface (4a) of abutted flanges (4), and a peripheral portion thereof is surrounded by a steel belt (7). ) And tighten it, and pressurize the sealing material (9) between the flanges (4) abutted through the rubber belt (6), and the sealing material (9) is the flange (4).
A method for repairing a pipe joint in which pressure is injected until it leaks from a hole (10) of a bolt (5) connecting the two.