JPH02102024A - Repairing method for tube branch and lining material used therefor - Google Patents

Abstract

PURPOSE:To facilitate mounting of a lining material on the inner surface of a tube branch irrespective of the size of the inner diameter of a main tube by deforming a cylindrical lining material having flexibility, inserting it from the outer opening of the branch tube, guiding it to the branch, and mounting it in an attitude for covering the inner surface of the branch by means of an operation from the outer opening of the branch tube. CONSTITUTION:A waterproof layer 4b having elasticity is formed by coating the inner surface of a cylindrical jacket 4a shaped at one end in a flared shape by knitting or hollow weaving yarns of polyester fiber with polymer material such as polyethylene, polyester, etc. or rubber, etc., and a cylindrical lining material 4 having flexibility and formed integrally with a lining hose part covering the inner surface of a branch tube 3a and an annular lining material covering the inner surface of a tube branch 3b is formed. The material 4 is folded longitudinally, inserted from the flange side opening 3d of the tube 3a, and extended in its attitude along the inner surface of the branch tube 3b in which cleaning is finished by means of an operation from the opening 3d. Thus, an operation from a main tube side is eliminated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention mainly relates to the inner peripheral surface side of a branch pipe, which is constructed by connecting a relatively short branch pipe for distribution to a main pipe such as a water supply pipe or a gas pipe. The present invention relates to a method for repairing a pipe branch portion, in which a lining material is attached to the inner circumferential surface of the pipe branch portion extending from the main pipe to the inner circumferential surface side of the main pipe, and the lining material used to carry out the method.

[Conventional technology]

The above-mentioned pipe branch section includes one in which the main pipe wall and the branch pipe wall are connected by a smooth curved wall, and one in which the main pipe wall and the branch pipe wall cross each other. However, in order to effectively prevent corrosion on the inner peripheral surface of the branch pipe, it is necessary to install an annular lining material that is integrally connected along the axis of the branch pipe from the inner peripheral surface of the branch pipe. It is necessary to install the lining material across the inner peripheral surface of the main pipe, and the maximum outer diameter of the lining material is larger than the inner diameter of the branch pipe, so the lining material must be inserted from the branch pipe side and installed at the pipe branch. was not possible.

For this reason, in the conventional method of repairing a pipe branch, a method is used to insert a lining material from the main pipe side and attach it to the pipe branch, as described in, for example, Japanese Patent Application Laid-open No. 167193/1983. was.

[Problem to be solved by the invention]

According to the above-mentioned conventional technology, when installing the lining material by inserting it into the main pipe with a remote-controlled self-propelled pipe vehicle, there is a problem in that it takes time and effort to determine the installation position and installation posture of the lining material, and the main pipe If the inner diameter of the tube is sufficiently large and the worker carries it directly into the main pipe and installs it, it is easy to determine the installation position and posture, but there are safety problems such as the occurrence of an oxygen-deficient condition.

Furthermore, if the inner diameter of the main pipe is relatively small, it may be difficult to insert the lining material into the main pipe.In order to make the insertion of the lining material easier, reducing the size of the lining material makes it easier to insert the lining material into the main pipe. Coverage may be incomplete.

The present invention has been made in view of the above circumstances, and by devising the material of the lining material and the installation procedure, the lining material can be installed on the inner circumferential surface of the pipe branch regardless of the size of the main pipe inner diameter. It is an object of the present invention to provide a method for repairing a pipe branch that can be easily performed and a lining material suitable for carrying out the method.

[Means to solve the problem]

The first characteristic configuration of the present invention for achieving the above object is as follows:
In the above-mentioned method for repairing a pipe branch, (a) the step of deforming a flexible cylindrical lining material and inserting it from the outer opening of the branch pipe and guiding it to the pipe branch; A process of installing the lining material guided to the pipe branch in a position covering the inner circumferential surface of the pipe branch by operating from the outer opening of the branch pipe; comprising the steps (a) and (b) above. It is in.

A second feature of the method for repairing a pipe branch is that after the lining material is attached to the pipe branch, the main pipe lining hose is attached to the inner circumferential surface of the main pipe with an adhesive in a position that covers the peripheral edge of the lining material. There is a point where it is glued together.

A first feature of the lining material suitable for the pipe branch repair method according to the present invention is a lining hose portion that covers the inner circumferential surface of the branch pipe, and a lining hose portion that covers the inner circumferential surface of the pipe branch portion. The main feature is that the annular lining material is integrally formed.

A second feature of the lining material is that a flexible closing plate is integrally formed to partition the inner circumferential side of the branch pipe and the inner circumferential side of the main pipe.

A third characteristic configuration of the lining material is that the lining hose portion covers the inner circumferential surface of the branch pipe, the annular lining material covers the inner circumferential surface of the pipe branch, and the inner circumferential surface side of the branch pipe and the The main pipe is integrally formed with a flexible closing plate that partitions the inner circumferential surface of the main pipe.

[Function] According to the first feature of the pipe branch repair method, the lining material is inserted from the outer opening of the branch pipe and attached to the pipe branch, so that work from the main pipe side is not required.

Furthermore, since the flexible lining material is deformed and inserted into the branch pipe and attached to the pipe branch, a lining material of a predetermined size can be attached even if the main pipe inner diameter is small.

According to the second feature of the pipe branch repair method, the peripheral edge of the lining material is installed in a position where it is sandwiched between the inner circumferential surface of the pipe branch part and the main lining hose, so the lining material is difficult to peel off and is strong. Can be attached to.

According to the first feature of the lining material used in the pipe branch repair method according to the present invention, the lining material can be seamlessly coated from the inner peripheral surface of the branch pipe to the inner peripheral surface of the pipe branch part.

According to the second and third characteristic configurations of the lining material,
When gluing the main lining hose to the inner peripheral surface of the main pipe with adhesive after the lining material has been attached to the pipe branch, it is possible to prevent the adhesive from seeping out to the inner peripheral surface of the branch pipe using a blocking plate. This facilitates the subsequent cutting of the main lining hose.

In other words, in order to bond the main lining hose with adhesive, it is necessary to press the main lining hose against the inner peripheral surface of the main pipe, and at this time, the adhesive oozes out and stays on the branch pipe side, and when it hardens, Drilling holes in the main lining hose to connect the branch pipe and the main pipe has the drawback of requiring a lot of work, but since a closing plate is provided, the amount of adhesive remaining can be reduced, and this will prevent the adhesive from curing. Since the thickness of the main lining hose is relatively thin, drilling of the main lining hose is easy.

〔Effect of the invention〕

The method for repairing a pipe branch part according to claim 1 does not require work from the main pipe side, so it is possible to repair lining material of a predetermined size by simple work from the outside opening of the branch pipe, regardless of the size of the main pipe inner diameter. Can be easily attached to the inner peripheral surface of a pipe branch.

According to the method for repairing a pipe branch portion according to the second aspect, the lining material can be firmly attached and the durability can be improved.

The lining material according to claim 3 can be continuously coated seamlessly from the inner circumferential surface of the branch pipe to the inner circumferential surface of the pipe branch part.
There is little risk of fluid entering between the lining material and the inner circumferential surface of the pipe, and highly reliable coating can be achieved.

The lining material according to claim 4 allows easy cutting of the main pipe lining hose bonded to the inner circumferential surface of the main pipe, and has excellent workability.

The lining material according to claim 5 allows easy cutting of the main pipe lining hose adhered to the inner circumferential surface of the main pipe, and
Since the coating from the inner circumferential surface of the branch pipe to the inner circumferential surface of the pipe branch part can be performed in a continuous manner without any joints, the workability is even better and the coating can be performed with high reliability.

〔Example〕

An example of the present invention is a water pipe buried underground (
A) will be explained.

As shown in Figure 2, the main pipe lining hose (2) inserted into the main pipe (1) is glued to the inner peripheral surface of the main pipe (1) so that the main pipe (1) can be rehabilitated. Pit holes (PI) were excavated at two locations separated by a distance from the pit hole, and the main pipe (1) was cut at these pit locations.

A branch pipe (3a) is connected to the main pipe (1),
A cylindrical lining material (4) is inserted from the side port (3d) of the flange joint (3c) located as close as possible to the pipe branch part (3b) of this branch pipe (3a), and the inner periphery of the branch pipe (3a) is In order to be able to rehabilitate the aging branch pipe (3a) by bonding it to the surface, the pipe (p,) was excavated to expose the flange joint (3c).

Next, from the inner peripheral surface of the branch pipe (3a) to the inner peripheral surface of a curved pipe branch part (3b) that connects the pipe wall of the main pipe (1) and the pipe wall of the branch pipe (3a). Attach a cylindrical lining material (4) that is integrally formed with a lining hose portion that covers the inner circumferential surface of the branch pipe (3a) and an annular lining material that covers the inner circumferential surface of the pipe branch portion (3b). A method for doing this will be explained based on FIGS. 1 and 3.

As shown in Figure 3, it is a cylindrical jacket made of polyester fiber threads knitted or bag-woven and shaped into a trumpet shape on one end. Alternatively, a waterproof layer (4b) with elasticity is formed by coating with rubber or the like, thereby covering the lining hose portion that covers the inner peripheral surface of the branch pipe (3a) and the inner peripheral surface of the pipe branch part (3b). A flexible cylindrical lining material (4) is formed integrally with the annular lining material.

This lining material (4) is folded in the longitudinal direction as shown in FIG. As shown in FIG. 1(b), it is spread out in a position along the inner circumferential surface of the pipe branch part (3b) after cleaning.

Next, this lining material (4) is fixed to the inner peripheral surface of the pipe.If the shape of the outer peripheral surface of the lining material (4) matches the shape of the inner peripheral surface of the pipe with good accuracy, the lining material
Although the entire surface of the outer circumferential surface of 4) may be adhered to the inner circumferential surface of the pipe with a two-component epoxy adhesive applied in advance to the outer circumferential surface or the inner circumferential surface of the pipe, the lining of this example The material (4) is not only flexible but also has elasticity, so that if the shape of the outer circumferential surface of the lining material (4) does not match accurately, it can be forcibly deformed elastically. As shown in Fig. 3, the edge portion (4C) of the lining material (4) is formed only with the waterproof layer (4b), and this edge portion ( 4C)
is thermally fused to the inner circumferential surface of the tube while being aligned along the inner circumferential surface of the tube by operating from the opening (3d) side.

After installing the lining material (4), as shown in FIG.
), glue the main pipe lining hose (2) to the inner peripheral surface of the main pipe (1), form a communication hole (6) with a cutter (5), and connect the main pipe (1) and the branch pipe (3a). It is for communication connection.

[Another example]

Although not shown, after attaching the main pipe lining hose (2) to the inner peripheral surface of the main pipe (1) and forming a communication hole (6) in the main pipe lining hose (2), cover the peripheral edge of the communication hole (6). The lining material (4) may be attached in this position.

In this case, a step is created on the inner peripheral surface of the pipe branch part (3b) by the thickness of the main lining hose (2), but as described above, the lining material (4) can be elastically deformed. The end edge portion (4C) can be thermally fused to the main lining hose (2) while being forcibly elastically deformed to cover the main lining hose (2).

When the edge portion (4C) of the lining material (4) is bonded with adhesive, as shown in Fig. 4, a rubber airtight bag (7) like a balloon inserted from the branch pipe (3a) is used. In charge of (
1) It is desirable to press and hold the edge portion (4C) by inflating it with air supplied through the valve (V).

When the outer diameter of the airtight bag (7) is smaller than the inner diameter of the main pipe (1), the lower surface of the airtight bag (7) is supported against the inner peripheral surface of the main pipe (1), as shown in Fig. 5. Additional fittings (7a)
By connecting it to the airtight bag (7), the edge portion (4C) can be held under pressure, and if the length of this fitting (7a) is adjustable, it can be used more conveniently. .

As shown in Figure 7 (a) and (b), the lining material (4
) A flexible closing plate (4d) made of elastic synthetic resin such as polyethylene or polyester or rubber is placed at the edge portion (4C) or at a position inserted from the edge portion (4C). Lining material provided integrally (4)
As shown in Figure 6, after installing this lining material (4), connect the main lining hose (2) to the main pipe (1).
When adhering to the inner peripheral surface using, for example, a two-component epoxy adhesive (8), the adhesive ( 8) is difficult to stay on the inner circumference side of the lining material (4), so the adhesive (8) that has remained on the inner circumference side of the lining material (4)
Even if 8) hardens, the amount thereof is relatively small, and it is easy to form a communication hole (6) in the main lining hose (2) for communicating the main pipe (1) and the branch pipe (3a).

In the lining material (4) shown in this example, the lining hose part that covers the inner peripheral surface of the branch pipe and the annular lining material that covers the inner peripheral surface of the branch pipe (3b) are integrally formed. An annular lining material that covers the inner circumferential surface of the pipe branch part, which is the joint part with the branch pipe, may be formed and installed separately from the lining hose part that covers the inner circumferential surface of the branch pipe, and the annular lining material may be attached with the aforementioned plug. The plate (4d) may also be formed physically.

The closing plate (4d) and the lining material (4) may be formed separately from the same material or different materials and then joined together.

Note that although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structures and methods shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawing is a partially sectional side view showing another embodiment of the pipe branch repair method and the repairing material according to the present invention. (1) Main pipe, (2) Main lining hose, (3a) Branch pipe, (3b)
...Pipe branch, (3d) ...Opening, (
4)・・・Lining material, (4d)・・・・・・
Closing board.

Claims (1)

[Claims] 1. A lining material (4) is provided on the inner circumferential surface of the pipe branch part (3b) extending from the inner circumferential surface side of the branch pipe (3a) to the inner circumferential surface side of the main pipe (1).
(a) A flexible cylindrical lining material (4) is deformed and inserted from the outer opening (3d) of the branch pipe (3a), Step (b) of guiding the lining material (
4) is installed in a position covering the inner circumferential surface of the pipe branch part (3b) by operating from the outer opening (3d) of the branch pipe (3a), comprising the steps (a) and (b) above. A method for repairing a pipe branch part, characterized in that: 2. After attaching the lining material (4) to the pipe branch part (3b), glue the main pipe lining hose (2) to the inner peripheral surface of the main pipe (1) in a position that covers the peripheral edge of the lining material (4). 2. The method for repairing a pipe branch according to claim 1, wherein the pipe branch is bonded with an adhesive. 3. The lining hose portion that covers the inner peripheral surface of the branch pipe (3a) and the annular lining material that covers the inner peripheral surface of the pipe branch part (3b) are integrally formed. Lining material used in the pipe branch repair method described in 2. 4. A flexible closing plate (4d) that partitions the inner peripheral surface side of the branch pipe (3a) and the inner peripheral surface side of the main pipe (1) is integrally formed. Lining material used for repairing pipe branches. 5. A lining hose portion that covers the inner peripheral surface of the branch pipe (3a), an annular lining material that covers the inner peripheral surface of the pipe branch part (3b), and an inner peripheral surface side of the branch pipe (3a). The lining material used in the method for repairing a pipe branch portion according to claim 2, further comprising a flexible closing plate (4d) that partitions the inner peripheral surface side of the main pipe (1).