JPS63254033A - Tubular lining material having multilayer structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tubular lining material having a multilayer structure that forms a rigid lining tube on the inner peripheral surface of an old pipe.

(Prior technology) When sewer pipes, electric, gas pipes, and other industrial pipes buried underground become obsolete, lining can be applied to the inner circumferential surfaces of these pipes without digging them out. A construction method for repairing, reinforcing, etc. the aged pipe by applying this has already been proposed and put into practical use (see, for example, Japanese Patent Laid-Open No. 60-242038).

In other words, this construction method involves impregnating a tubular lined pipe made of a flexible resin absorbent material with a film coating on the surface with a hardening resin, and removing the aging of the pipe constructed in this way (hereinafter referred to as liner back). Insert the liner back into the pipe while turning it upside down, press it against the inner circumferential surface of the aged pipe with fluid pressure, and then heat the liner back to harden the curable resin impregnated with it, thereby removing the inner periphery of the aged pipe. A rigid lining tube is formed and lined.

[Problems to be solved by the invention] However, in the construction method described above, depending on the degree of deterioration of the pipe or the state of burial, it may be necessary to further improve the mechanical properties of the pipe. This was dealt with by increasing the thickness of the upholstery.

However, when the thickness of the tubular lining material is increased, the tubular lining material becomes heavier, making it difficult to transport, install, etc., and requires a large amount of curable resin to be impregnated into it, which increases costs. Additionally, as the thickness of the tubular lining material increases, the diameter of the conduit decreases, resulting in a reduction in the flow rate of fluid flowing therethrough.

The present invention was made in view of the above problems, and its purpose is to improve the mechanical properties of aged pipes without increasing their thickness, thereby reducing the difficulty of transportation and construction work, and increasing costs. An object of the present invention is to provide a tubular lining material having a multilayer structure that can solve problems such as a reduction in fluid flow rate.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a material for lining the inner circumferential surface of an old pipe, the surface of which is a flexible resin absorbent material coated with a film. The tubular lining material is characterized by having a multilayer structure in which a material for improving mechanical properties is concentrically sandwiched between the resin absorbent materials.

(Function) As the mechanical properties of the resin absorbent material are significantly improved compared to those of conventional single-layer materials, the mechanical properties of old pipes can be improved without increasing the thickness of the tubular lining material. This effectively solves problems such as difficulty in transportation and construction work due to increased weight of the tubular lined pipe, increased cost due to increased amount of curable resin impregnated, and decreased fluid flow rate due to reduced pipe diameter. can be resolved.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a perspective view showing the structure of a tubular lining material according to the present invention;
Figure 2 is a cross-sectional view showing the multilayer structure of the tubular lining material.
As shown in these figures, the outer surface of the tubular lining material I is coated with a highly watertight film 2. Inside this film 2, resin absorbents 3 and 4 are placed between a tubular material 5 for improving mechanical properties.
Therefore, the film 2, the resin absorbent material 3.4, and the material 5 constitute a multilayer structure. As the resin absorbent material 3.4, a nonwoven fabric such as Bossester, nylon, acrylic, or vinyl chloride is used, and as the material 5, reinforcing fiber such as glass fiber, carbon fiber, or plastic fiber is used. Although not shown in the figure, in the actual construction method, the tubular lining material 1 is reversed as described below, so the film 2, resin absorbent material 3, material 5, and resin absorbent material 4 that make up this material are The diameter gradually increases in this order.

The tubular lining material I constructed in multiple layers as described above is impregnated with a curable resin, or this impregnation is carried out as shown in FIG. That is, the curable resin 7 supplied from the injection hose 6 is injected into the inside of the tubular lining material 1 from the opening 7 at one end thereof, and the tubular lining material 1 is passed through the roller 8 rotating in the direction of the arrow shown in the figure. By doing this, the resin absorbent materials 3 and 4 are impregnated with a certain amount of curable resin 7. The curable resin 7 may be one that is cured by physical curing means such as heat curing, room temperature curing, or photocuring, but in this embodiment, a heat curing resin is used.

In this way, the tubular lined pipe 1 (liner back) made by passing through the rollers 8 and impregnating the resin absorbing material 3.4 with a certain amount of curable resin 7 is formed on the inner periphery of the aged pipe 9 shown in FIG. The surface is lined by the following method. That is, as shown in FIG. 5, the tubular lining pipe 1 is inserted into a pipe-shaped reversing guide 11 that is vertically supported in a manhole 10 that opens into an old pipe 9.
The tip of the tubular lining tube 1 is inverted and fixed to the outer periphery of the open end of the inversion guide 11 as shown in the figure. Next, 1 reversal guide 11
When water is injected from the water injection hose 12 into the tubular lined pipe l
As shown by the broken line in FIG. 5, it moves in the direction of the arrow in the aged pipe 9 while being reversed by the water pressure, and at the same time, the reversed portion is pressed against the inner circumferential surface of the aged pipe 9 by the water pressure. When the reversal and insertion of the tubular lining material 1 over the entire length of the old pipe 9 to be lined is completed, hot water supplied from a boiler (not shown) is replaced with water and placed inside the tubular lining material 1. When fed, the tubular lining material 1 is heated by hot water, and the hardening resin 7 impregnated in the resin absorbing material 3.4 hardens to form a rigid lining pipe on the inner periphery of the aged pipe 9. Here, the inner peripheral surface of the aged pipe 9 is lined with the tubular lining material 1.

In the above, the tubular lining material 1 is constructed in multiple layers by sandwiching the reinforcing fiber material 5 such as glass H&fiber between the resin absorbent material 3. Can enhance mechanical properties. Therefore, an increase in the weight of the tubular lining material 1 is avoided, and its transportation, construction work, etc. are facilitated, and the required amount of the curable resin 7 to be impregnated into the tubular lining material 1 is small. The cost of the lining material (liner bag) 1 can be reduced. Furthermore, since the thickness of the tubular lining material l does not increase, a decrease in the fluid passage cross-sectional area of the aged pipe 9 lined with this material is prevented, and a decrease in the flow rate of fluid flowing through the aged pipe 9 is also prevented. It will be done.

FIG. 3 is a view similar to FIG. 2 showing a modified embodiment of the present invention. In this modified embodiment, the outer surface of the film 2 is further covered with a rubber tube 13. When lining sewer pipes, etc., where there is a lot of water intrusion, this prevents direct contact between the water and the hardening resin, and the hardening resin prevents the water from entering.

This eliminates the possibility of being washed away by water or causing poor curing in areas that come into contact with invading water. In addition, in Figure 5, 3 and 4
5 is a resin absorbent material, and 5 is a material made of reinforcing fibers such as glass fibers.

By the way, in the above embodiment, only one layer of material 5 is sandwiched, but it goes without saying that a plurality of layers of material 5 may be sandwiched.

(Effects of the Invention) As is clear from the above description, according to the present invention, a material for improving mechanical properties is sandwiched concentrically between resin absorbent materials to form a multilayer structure of the tubular lining material. It is possible to improve the mechanical properties of old pipes without increasing the thickness of the tubular lining material, and it also makes it easier to transport and install the tubular lining material, reduces costs, and prevents a decrease in fluid flow rate. You can get the effect of being able to aim for things.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the structure of a tubular lining material according to the present invention;
Fig. 2 is a cross-sectional view showing the multilayer structure of the tubular lining material, Fig. 3 is a cross-sectional view showing a modified embodiment of the present invention, Fig. 4 is a cross-sectional view showing a method of impregnating the curable resin, and Fig. 5 1 is a cross-sectional view showing a construction method for lining the inner peripheral surface of an old pipe. l... Tubular lining material, 2... Film, 3, 4...
Resin absorbent material, 5...Material for improving mechanical properties, 9...Old pipe. Patent Applicant Tobu Cleaner Service Co., Ltd. Agent Patent Attorney Ryo Yamashita -q Figure 3 Figure 4 District 5 Procedural Amendment Form Stamped January 8, 1988

Claims (3)

[Claims] (1) In a tubular lining material made of a flexible resin absorbent material whose surface is coated with a film, which is a material for lining the inner circumferential surface of an old pipe, there is a mechanical gap between the resin absorbent materials. A tubular lining material with a multilayer structure characterized by a multilayer structure made by sandwiching materials concentrically to improve properties. (2) The tubular lining material having a multilayer structure according to claim 1, wherein the resin absorbent material is a nonwoven fabric of polyester, nylon, acrylic, vinyl chloride, or the like. (3) A tubular lining having a multilayer structure according to claim 1, wherein the material for improving mechanical properties is a reinforcing fiber such as glass fiber, carbon fiber, or plastic fiber. Material.