JPH08258152A - Pipe lining material and internal pressure pipe repairing method - Google Patents

Abstract

PURPOSE: To impart sufficient internal pressure strength and external pressure strength to an internal pressure pipe and to prevent the peeling of a cured pipe lining material from the inner wall of the internal pressure pipe. CONSTITUTION: A pipe lining material is formed into a multilayered structure from an internal pressure-resistant soft liner 2 high in tensile strength and an external pressure-resistant liner 3 impregnated with a curable resin and having high bending modulus. When an internal pressure pipe 10 is repaired, the pipe lining material 1 is introduced into the internal pressure pipe 10 to be pressed to the inner wall of the internal pressure pipe 10 in such a state that the external pressure-resistant liner 3 is positioned as the innermost layer and the curable resin infiltrated into the liner 3 is cured in this state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe lining material for repairing an internal pressure pipe such as a gas pipe or a water pipe, and an internal pressure pipe repairing method constructed using the pipe lining material.

[0002]

2. Description of the Related Art When a pipeline such as a sewer pipe buried in the ground is deteriorated, the pipeline is repaired by lining the inner surface of the pipeline without excavating the pipeline from the ground. The pipe repair method is known.

That is, in the above-mentioned pipe repairing method, a pipe lining material made by impregnating a curable resin into a flexible tubular resin absorbent material whose outer peripheral surface is covered with a highly airtight film is piped by fluid pressure. Insert the pipe lining while inverting it, press the pipe lining material against the inner peripheral surface of the pipe, and heat the pipe lining material while maintaining that state to cure the curable resin impregnated in the pipe lining material. This is a construction method in which the inner peripheral surface of the pipeline is lined by doing so.

As a pipe lining material used for lining internal pressure pipes in which high-pressure fluid flows, such as gas pipes and water pipes, a material having high internal pressure resistance, that is, soft and high tensile strength is used. The material must be selected.

[0005]

By the way, in an internal pressure pipe such as a gas pipe or a water pipe, a high negative pressure may be generated, for example, when starting or stopping a pump, and cavitation is generated at a high position in some places. Negative pressure is generated. When lining is applied to an internal pressure pipe that generates such a high negative pressure using a soft and high tensile strength pipe lining material, the pipe lining material is pulled by a high negative pressure and peels from the inner wall of the internal pressure pipe. However, there is a problem that the flow path of the internal pressure pipe is blocked.

Therefore, conventionally, the inner pressure pipe has to be lined with a pipe lining material having a certain degree of outer pressure strength at the expense of the inner pressure strength.

The present invention has been made in view of the above problems, and an object thereof is to provide a pipe lining material having both sufficient internal pressure strength and external pressure strength.

Further, an object of the present invention is to provide an internal pressure pipe repairing method capable of preventing the hardened pipe lining material from peeling off from the inner wall of the internal pressure pipe even if a high negative pressure is generated in the internal pressure pipe. To provide.

[0009]

In order to achieve the above object, the invention according to claim 1 provides a pipe lining material with a soft internal pressure resistant liner having a high tensile strength and a curable resin so as to obtain a high bending elasticity. It is characterized in that it has a multi-layer structure with the external pressure resistant liner.

According to a second aspect of the present invention, a pipe lining material composed of multiple layers of a soft inner pressure resistant liner having high tensile strength and an outer pressure resistant liner impregnated with a curable resin and having high bending elasticity is provided inside the inner pressure pipe. Introducing and pressing the pipe lining material against the inner wall of the inner pressure pipe with the outer pressure resistant liner positioned in the innermost layer, and curing the curable resin impregnated in the outer pressure resistant liner while maintaining that state. Is characterized by.

According to a third aspect of the present invention, in the second aspect of the present invention, the pipe lining material is formed into a two-layer structure by arranging an inner pressure resistant liner inside an outer pressure resistant liner. It is characterized in that it is reversely inserted into the internal pressure pipe by fluid pressure.

According to a fourth aspect of the present invention, in the second aspect of the invention, the internal pressure resistant liner is drawn into an internal pressure pipe, and the external pressure resistant liner is reversed and inserted into the internal pressure resistant liner by fluid pressure. And

[0013]

According to the first aspect of the present invention, since the pipe lining material is composed of a multi-layered inner pressure resistant liner having high inner pressure strength and an outer pressure resistant liner having high outer pressure strength, the inner pressure and the outer pressure acting on the inner pressure pipe are The inner pressure resistant liner and the outer pressure resistant liner are shared by the inner pressure resistant liner and the inner pressure resistant liner, respectively, so that the pipe lining material is not deformed by the inner pressure or the outer pressure, and the inner pressure pipe is reliably lined and repaired by the pipe lining material.

According to the second aspect of the present invention, since the outer pressure resistant liner, which has a high external pressure strength and is not deformed against a high negative pressure generated in the inner pressure pipe, is located in the innermost layer, a high negative pressure is applied to the inner pressure pipe. Even if it occurs, the pipe lining material does not peel off from the inner wall of the internal pressure pipe due to the negative pressure and block the flow path of the internal pressure pipe.
Further, the internal pressure and the external pressure acting on the internal pressure pipe are shared by the internal pressure resistant liner and the external pressure resistant liner, respectively.

According to the third aspect of the invention, when the pipe lining material is reversed and inserted into the inner pressure pipe by the fluid pressure, the outer pressure resistant liner is located in the innermost layer, so that the same effect as that of the second aspect of the invention is obtained. Is obtained.

According to the invention as set forth in claim 4, when the outer pressure resistant liner is reversed and inserted by fluid pressure into the inner pressure resistant liner drawn into the inner pressure pipe, the outer pressure resistant liner is positioned in the innermost layer, and therefore the inner pressure resistant liner is located in the innermost layer. The same effect as the described invention can be obtained.

[0017]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partial perspective view of a pipe lining material 1 according to the present invention. The pipe lining material 1 has a two-layer structure in which an external pressure resistant liner 3 is superposed on an outer side of an internal pressure resistant liner 2.

The internal pressure resistant liner 2 has a high internal pressure strength, and is made of a soft and high tensile strength tubular non-woven fabric or tubular woven fabric, or the inner and outer peripheral surfaces of the tubular non-woven fabric or tubular woven fabric are airtight. The hose is made of a material coated with a high plastic film or impregnated with a soft curable resin, or a hose made of a thermoplastic resin cloth or a nonwoven fabric.

The external pressure resistant liner 3 is impregnated with a curable resin and exhibits high bending elasticity after the curable resin is cured. This is a tubular nonwoven fabric impregnated with 3a of the curable resin. The outer peripheral surface is covered with a highly airtight plastic film 3b.

Next, a method of repairing the internal pressure pipe constructed by using the pipe lining material 1 constructed as above will be described with reference to FIGS. 2 and 3. 2 and 3 are sectional views showing the repairing method according to the present invention in the order of steps.

In FIG. 2 and FIG. 3, 10 is an internal pressure pipe such as a gas pipe buried in the ground. Inside the internal pressure pipe 10, the pipe lining material 1 is reversed by the fluid pressure and in the direction of the arrow shown. (Right side of FIG. 2).

When the reverse insertion of the pipe lining material 1 into the internal pressure pipe 10 is completed, the external pressure resistant liner 3 is located inside and the internal pressure resistant liner 2 is located outside, as shown in FIG. While the fluid pressure is applied to the inside of the pipe 1 as it is, the curable resin impregnated in the external pressure resistant liner 3 is cured while the pipe lining material 1 is pressed against the inner wall of the internal pressure pipe 10. For example, when the curable resin impregnated in the external pressure resistant liner 3 is a thermosetting resin, the pipe lining material 1
When the pipe lining material 1 is heated by supplying a heating medium such as hot water or steam therein, the thermosetting resin impregnated in the external pressure resistant liner 3 is cured by heat. When the internal pressure resistant liner 2 is also impregnated with the thermosetting resin, the thermosetting resin is similarly cured.

When the curable resin is cured as described above, the inner peripheral surface of the internal pressure pipe 10 is lined with the cured pipe lining material 1 for repair, but the pipe lining material 1 is soft and has a high tensile strength. Since the inner pressure liner 2 and the outer pressure resistant liner 3 which is hard and has high flexural elasticity are composed of two layers, the pipe lining material 1 exhibits sufficient durability against both internal pressure and external pressure. That is, even if a high internal pressure acts on the pipe lining material 1 because a high-pressure fluid flows through the internal pressure pipe 10, the internal pressure resistant liner 2 of the pipe lining material 1 has high tensile strength. Exhibits high durability against internal pressure. Further, when the internal pressure pipe 10 receives a high external pressure from the outside, the external pressure resistant liner 3 of the pipe lining material 1 is hard and has a high bending elasticity.
Even if a high external pressure acts on this, it does not deform and can sufficiently withstand a high external pressure.

Furthermore, when a pump (not shown) connected to the internal pressure pipe 10 is started or stopped, a high negative pressure is generated in the internal pressure pipe 10, or cavitation is generated in a bent portion of the internal pressure pipe 10, so that a high negative pressure is generated in that portion. Even if a pressure is generated, the outer pressure resistant liner 3 is located inside and does not deform even when subjected to a high negative pressure, so that the pipe lining material 1 does not peel off from the inner wall of the inner pressure pipe 10, The problem that the pipe 10 is blocked by the pipe lining material 1 does not occur.

In addition, the internal pressure pipe 10 due to ground subsidence, an earthquake, etc.
And part of the external pressure resistant liner 3 of the pipe lining material 1 is shown in FIG.
Even if the inner pressure resistant liner 2 is flexible and has high tensile strength even if it breaks as shown in (1), the gas flowing in the inner pressure pipe 10 does not leak to the outside, and the safety is high. Is secured.

In the above embodiment, the pipe lining material 1 is inserted into the internal pressure pipe 10 by fluid pressure as shown in FIG. 2. However, as shown in FIG. The internal pressure resistant liner 3 may be pulled into the internal pressure pipe 10 and the external pressure resistant liner 3 may be reversed and inserted into the internal pressure resistant liner 2 pulled by the fluid pressure.

In the above embodiments, the pipe lining material 1 is used.
Although the inner pressure resistant liner 2 and the outer pressure resistant liner 3 have a two-layer structure, the inner pressure resistant liner 2 and the outer pressure resistant liner 3 may be stacked to form a pipe lining material having a multilayer structure of three or more layers. However, even in this case, when the pipe lining material is introduced into the inner pressure pipe and pressed against the inner wall of the inner pressure pipe, the outer pressure resistant liner needs to be positioned in the innermost layer thereof.

[0029]

As is apparent from the above description, claim 1
According to the invention described, since the pipe lining material is composed of a soft inner pressure resistant liner having high tensile strength and an outer pressure resistant liner impregnated with a curable resin and having high bending elasticity, it is sufficient for the pipe lining material. It is possible to obtain the effect that both the internal pressure strength and the external pressure strength can be provided.

According to the second aspect of the present invention, a pipe lining material composed of multiple layers of an inner pressure resistant liner that is soft and has high tensile strength, and an outer pressure resistant liner that is impregnated with a curable resin and has high bending elasticity. Is introduced into the inner pressure pipe, and the pipe lining material is pressed against the inner wall of the inner pressure pipe in a state where the outer pressure resistant liner is located in the innermost layer, and while maintaining this state, the curable resin impregnated in the outer pressure resistant liner. Therefore, even if a high negative pressure is generated in the internal pressure pipe, the cured pipe lining material can be prevented from peeling off from the inner wall of the internal pressure pipe.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a pipe lining material according to the present invention.

FIG. 2 is a cross-sectional view showing an internal pressure pipe repairing method according to the present invention.

FIG. 3 is a cross-sectional view showing a method of repairing an internal pressure pipe according to the present invention.

FIG. 4 is a cross-sectional view showing a state where the internal pressure pipe is broken.

FIG. 5 is a cross-sectional view showing another embodiment of the internal pressure pipe repairing method according to the present invention.

[Explanation of symbols]

 1 Pipe lining material 2 Internal pressure resistant liner 3 External pressure resistant liner 10 Internal pressure pipe

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location B29L 23:00

Claims (4)

[Claims] 1. A pipe lining material, which is composed of a soft inner pressure resistant liner having high tensile strength and an outer pressure resistant liner impregnated with a curable resin and having high bending elasticity in a multilayer structure. 2. A pipe lining material composed of a soft inner pressure resistant liner having high tensile strength and an outer pressure resistant liner impregnated with a curable resin and having high flexural elasticity is introduced into the inner pressure pipe, and the pipe lining is introduced. Material is pressed against the inner wall of the inner pressure pipe in a state where the outer pressure resistant liner is located in the innermost layer, and while maintaining this state, the curable resin impregnated in the outer pressure resistant liner is cured. Repair method. 3. The pipe lining material has a two-layer structure in which an inner pressure resistant liner is arranged inside an outer pressure resistant liner.
The internal pressure pipe repairing method according to claim 2, wherein the internal pressure pipe is reversely inserted into the internal pressure pipe by fluid pressure. 4. The method for repairing an internal pressure pipe according to claim 2, wherein the internal pressure resistant liner is drawn into an internal pressure pipe, and the external pressure resistant liner is reversed and inserted into the internal pressure resistant liner by fluid pressure.