JP3009956B2 - Repair method for fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for preventing leakage of a fluid flowing through a pipe joint such as a water pipe or a gas pipe without interrupting the fluid in the pipe when the fluid leaks inside the pipe. Regarding the part repair method, in detail, the joint ends of the pair of fluid conduits are individually fitted inside both ends of the tubular joint body, and the pair of fluid conduits are connected and connected, and the joint body and the joint body A seal ring is provided to seal between the joint ends of the pair of fluid conduits, and a pair of dresser flanges respectively contacting the pair of seal rings from both outer sides in the axial direction of the fluid conduit are radially connected to each other. The pair of dresser flanges are tightened in a direction in which the pair of dresser flanges are close to each other, and a bolt and a nut for enhancing the sealing property are provided between the pair of dresser flanges. In joint relates to a pipe joint portion repair process to prevent leakage of fluid therefrom.

[0002]

2. Description of the Related Art Conventionally, this type of pipe joint repairing method considers a large range of measures for preventing fluid leakage in a pipe from the pipe joint, and extends to a part of the pipe before and after the pipe joint in the longitudinal direction of the fluid conduit. The method was implemented by providing a joint cover. In one example, the joint cover is divided into two parts by the surface including the axis of the fluid conduit as the joint cover, and the divided surface and the cover are assembled, and the joint part cover is subjected to a sealing treatment on the surface that contacts the fluid conduit. There is a method of repairing a pipe joint part in which a part of a fluid conduit to which the pipe joint is attached and the pipe joint part are wrapped and the joint part covers are connected by bolts to prevent leakage of fluid.

[0003]

However, the above-mentioned conventional joint repair method employs a method of providing a joint cover that wraps around a part of the fluid conduit, so that the joint cover is necessarily large. However, there is a disadvantage that it cannot be accommodated in a pipe joint portion in a narrow space.

In addition to not only forming the cover separately but also considering the shape and dimensions of the joint cover, the shape and dimensions of the pipe joint repair part to be processed may vary depending on the site. It is necessary to manufacture and prepare various types of joint cover that meet these conditions, which is disadvantageous in that it is extremely troublesome and economical.

In view of the above-mentioned drawbacks, an object of the present invention is to facilitate repair work in a narrow space, to easily repair pipe joints of various sizes, and to be economical.
It is an object of the present invention to provide a pipe joint repair method that can be surely repaired.

[0006]

In order to achieve this object, a method of repairing a pipe joint according to the present invention comprises a first contact portion which can be applied to an outer surface of a dresser flange, and an outer peripheral portion of a fluid conduit. A flexible seal belt made of rubber or resin provided with second contact portions that can be applied to both ends of the width direction is provided, and the first contact portion is attached to the dresser flange. The seal belt is wound around the entire outer periphery of the fluid conduit in a state where the second contact portions are respectively applied to the outer peripheral portion of the fluid conduit, and the outer peripheral portion of the second contact portion is a steel belt. A press wheel having a third contact portion which is provided with an insertion hole for the bolt and which can be applied to the back surface of the first contact portion, is provided. The hole is inserted through the bolt and the third
The contact portion is brought into contact with the back surface of the first contact portion,
Via the nut, press the third contact portion against the back surface of the first contact portion, press the first contact portion against the dresser flange, between the seal belt and the fluid conduit, and Pressurizing and injecting a sealing material into a gap between the seal belt and the dresser flange, and pressurizing and injecting the sealing material until the sealing material leaks from a joint portion of the two divided dresser flanges. The operation and effects are as follows.

[0007]

According to the above-mentioned characteristic means, a flexible seal belt made of rubber or resin is prepared, and the first contact portion is provided on the dresser flange, and the second contact portion is provided on the outer peripheral portion of the fluid conduit. In the abutted state, a seal belt is wrapped around the entire outer periphery of the fluid conduit, the outer periphery of the second contact portion is wrapped with a steel belt and fastened, and the bolt is inserted through the insertion hole of the push ring Then, the third contact portion of the pressing ring is brought into contact with the back surface of the first contact portion, and the third contact portion is inserted through the nut.
By pressing the contact portion against the back surface of the first contact portion and pressing the first contact portion against the dresser flange, the second contact portion and the first contact portion of the seal belt are connected to the fluid conduit peripheral portion. The gap between the joint body and the fluid conduit, which is one of the parts where the fluid inside the fluid conduit leaks, which is separately in close contact with the outer surface of the dresser flange, is ensured over the entire circumference of the fluid conduit. It will be packed.

In addition, a sealing material is injected under pressure into the gap between the seal belt and the fluid conduit and between the seal belt and the dresser flange, and is injected under pressure until the sealing material leaks from the fitting portion of the dresser flange. By taking the method, it is possible to confirm that the gap is filled with the sealing material and that the sealing material is reliably filled in the gap by leaking the sealing material from the fitting portion of the dresser flange.

On the other hand, the processing of the seal belt does not require any special processing merely by cutting to a length corresponding to the flange circumference of the joint part to be repaired. There is no need to make and prepare tailored repair parts.

The installation area of the seal belt, the steel belt, and the press ring is limited to the outer peripheral surface of the fluid conduit and the outer surface of the dresser flange, and is similar to the joint cover used in the above-mentioned conventional repair method. In addition, since a large mounting space is not required, repair can be performed in a small space.

[0011]

Therefore, according to the pipe joint repair method of the present invention, repair in a narrow space is possible, and it is possible to easily and surely cope with pipe joints of various dimensions, without any trouble. Economic repairs are now possible.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a case where an embodiment of the present invention is applied to a pipe joint called a dresser 1 will be described. The dresser 1 is used to connect a pair of pipes 2 (an example of a fluid conduit) disposed so as to face each other on the same axis so as to be relatively movable in their axis directions. As shown in FIG. 1, the dresser 1 includes a tubular joint body 1 a for internally fitting the joint ends of a pair of pipes 2 and communicatingly connecting the pipes 2, the joint body 1 a, and the existing pipes. And a pair of seal rings 3 for sealing between the two joint ends.
And a pair of dresser flanges 4 for tightening the seals from both outer ends in a direction approaching each other to improve the sealing performance. These pair of dresser flanges 4 are bolts 5 attached to the pair of dresser flanges 4.
The pair of dresser flanges 4 are tightened in a direction approaching each other by the a nut 5b. At this time, in the tightening operation, the seal ring 3 is pushed into the pair of narrowed annular grooves formed between the pipe 2 and the joint body 1a with the dresser flange 4 so as to be in close contact with both the pipe 2 and the joint body 1a. Then, they are connected to each other in a sealed state. Hereinafter, a sealing method for sealing the outer portion of the seal ring 3 along the pipe 2 where leakage occurs in the dresser 1 or the inner portion of the dresser flange 4 adjacent to this portion will be described.
Here, this part is referred to as a leakage point L. First, at the time of construction, the leaking dresser 1 is exposed, the leaked portion of the existing pipe 2 is washed with water, degreased, and washed again with water to remove chemicals (see FIG. 1 (a)). . Also, as shown in FIGS. 1 to 3, a rubber provided with a first contact portion 15 that can be applied to the outer surface of the dresser flange 4 and a second contact portion 16 that can be applied to the outer peripheral portion of the pipe 2. A flexible seal belt 6 made of a resin is prepared. To construct the seal belt 6, the first contact portion 15 is disposed on one side in the width direction of the belt body 6a over the entire length, and the second contact portion is arranged on the other side in the width direction of the belt body 6a. Part of the belt body 6 in the thickness direction.
It protrudes from a. Then, the seal belt 6 having the above configuration is used.
Is cut in accordance with the circumference of the pipe 2, and the first contact portion 15 is applied to the dresser flange 4, and the second contact portion 16 is applied to the outer periphery of the pipe 2. Is wound around the entire circumference of the seal belt. Then, the outer peripheral portion of the second contact portion 16 is fixed to the stainless steel belt 1.
4, the second contact portion 16 is brought into close contact with the outer peripheral surface of the pipe 2 using a fastener.

On the other hand, the insertion hole 13 for the bolt 5a
And a press wheel 12 having a third contact portion 17 that can be applied to the back surface of the first contact portion 15 of the wound seal belt 6. The preparation of the seal belt 6 and the pressing wheel 12 may be performed at any time before using them. To configure the pressing ring 12, a ring-shaped pressing ring main body 12a is provided,
The pressing wheel main body 12a is divided into two in the radial direction to form two divided pressing wheel main bodies 12a ', the insertion holes 13 for the bolts 5a are formed in each of the divided pressing wheel main bodies 12a', and the third contact ring main body 12a 'is formed. The contact portion 17 is provided at a portion of the side surface from the inner peripheral portion and the stopper 1 for the dresser flange 4.
Numerals 8 are formed in the thickness direction so as to protrude from the outer peripheral portion of the one side surface over the entire circumference, and a nut receiving portion 10 for the nut 5b is provided around the insertion hole 13.
The third contact portion 17 is formed by fixing a round bar to the push ring main body 12. The stopper 18 can prevent the third contact portion 17 from pressing the first contact portion 15 too much. The third contact portion 17 is brought into contact with the back surface of the first contact portion 15 by inserting the insertion hole 13 of the press ring 12 through the projecting end of the bolt 5a, and the third contact portion 17 is contacted with the third contact portion via the nut 5b and the washer 5c. The contact portion 17 is replaced with the first contact portion 1
5 to press the first contact portion 15 against the outer surface of the dresser flange 4. Then, through the injection hole 8 provided substantially at the center position in the width direction of the seal belt 6,
The sealing material 9 is injected under pressure by the injector P into the gap between the seal belt 6 and the pipe 2 and between the seal belt 6 and the dresser flange 4. The injection of the sealing material 9 is performed at a pressure approximately ² kg / cm ² higher than the gas pressure in the pipe.
The sealing material 9 is injected under pressure until the sealing material 9 leaks from the mating portion 20 of the dresser flange 4 divided in the radial direction. The seal belt 6 includes the injection hole 8.
In addition, a vent hole 11 is provided at a position facing the injection hole 8, and during the injection of the sealing material 9, gas stored between the flanges 4 butt against each other passes through the vent hole 11 through the joint. The sealing material 9 is pushed out of the part 2 and finally leaks, like the fitting part 20 of the dresser flange 4, so that the end of the filling can be known.

Thus, the sealing material 9 at the joint 2 is
Is completed, the injection hole 8 and the vent hole 11 are closed, and an aluminum collar (not shown) is arranged on the peripheral surface for the purpose of protecting the outer peripheral surface of the repaired portion, thereby completing the repair. is there.

Since the seal belt 6 has a part having a different role in its shape, the seal belt 6 is formed by using a different rubber material for the role. First, the first and second contact portions 15 and 16 are made of a relatively soft rubber in order to improve the close contact with the outer peripheral surface of the pipe. The part to be touched is made of rubber of a relatively hard material for the purpose of protection and ensuring pressure resistance because it is easy to touch the outside.

On the other hand, the sealing material 9 is formed of a two-liquid mixed type special resin. The sealing material 9 becomes a rubber-like elastic body when cured, and the curing speed is adjusted by adding a catalyst. Can be adjusted arbitrarily.

Another Embodiment The seal belt 6 may be made of resin. The target fluid conduit and the fluid flowing therethrough are not limited to the above embodiments,
It can be applied to both liquid and gas.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state of repair of a pipe joint (b) A sectional view showing a state of repair of a pipe joint

FIG. 2 is a detailed sectional view of a pipe joint.

FIG. 3 is an exploded perspective view of a pipe joint.

[Explanation of symbols]

 1a Joint body 2 Fluid conduit 3 Seal ring 4 Dresser flange 5a Bolt 5b Nut 6 Seal belt 9 Seal material 12 Push ring 13 Insertion hole 14 Steel belt 15 First contact portion 16 Second contact portion 17 Third contact portion

Claims (1)

(57) [Claims] 1. A joint end of a pair of fluid conduits (2) is individually fitted into both ends of a tubular joint body (1a) to connect and connect said pair of fluid conduits (2), A seal ring (3) for sealing between the joint body (1a) and the joint end of the pair of fluid conduits (2) is provided, and the seal rings (3) are provided from both outer sides in the axial direction of the fluid conduit (2). A pair of dresser flanges (4) that respectively contact the pair of seal rings (3) are formed by being divided into two in the radial direction, and the pair of dresser flanges (4) are tightened in directions approaching each other to seal the pair. A method of repairing a pipe joint portion in which a bolt (5a) and a nut (5b) for improving the performance are provided between the pair of dresser flanges (4) to prevent leakage of fluid therefrom. And the dress A first contact portion (15) that can be applied to the outer surface of the surf flange (4) and a second contact portion (16) that can be applied to the outer peripheral portion of the fluid conduit (2) are arranged in the width direction. A flexible seal belt (6) made of rubber or resin, which is provided separately at both ends, is prepared. The first contact portion (15) is attached to the dresser flange (4) by the second contact. The seal belt (6) is wound around the entire outer periphery of the fluid conduit (2) in a state where the portions (16) are applied to the outer periphery of the fluid conduit (2), respectively. The outer peripheral portion of (16) is wound around with a steel belt (14) and fastened, has an insertion hole (13) for the bolt (5a), and can be applied to the back surface of the first contact portion (15). A push ring (12) having a suitable third contact portion (17) is prepared, and the insertion of the push ring (12) is performed. The hole (13) is inserted through the bolt (5a) to bring the third contact portion (17) into contact with the back surface of the first contact portion (15), and via the nut (5b). The third contact portion (17) is pressed against the back surface of the first contact portion (15), and the first contact portion (15) is pressed against the dresser flange (4). ) And the fluid conduit (2), and a gap between the seal belt (6) and the dresser flange (4) by pressurizing and injecting a sealing material (9) into the gap. A method of repairing a pipe joint portion in which the sealing material (9) is pressurized and injected until the sealing material (9) leaks from the mating portion (20) of the flange (4).