JP3165227B2 - Pipe liner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining material and a lining method for reinforcing a pipe buried in the ground by forming a strong FRP pipe inside the pipe. The present invention relates to a lining material and a lining method particularly suitable for lining a sewer pipe underground.

[0002]

2. Description of the Related Art In recent years, a sheet material obtained by dispersing high-strength fibers in a curable resin liquid and increasing the viscosity of the curable resin liquid is rolled into a tubular shape as a lining material for this kind of conduit, and both side edges are formed. A lining material using a sheet molding compound (SMC) which is overlapped and sandwiched between an inner tube and an outer film is known.

[0003] When the inner lining material is peeled, the outer film is peeled off, pulled into the pipe and inserted therethrough. When the inner tubing is expanded by applying a fluid pressure to the inner tubing, the overlapping portion of the sheet material shifts to expand the diameter. Along the inner surface of the pipeline. Then, when pressurized steam is fed and heated in this state, the curable resin liquid is cured, and a rigid FRP lining is formed inside the pipe.

[0004]

However, particularly in a sewer pipe, the pipe is constituted by a ceramic pipe, a fume pipe, or the like, and is easily broken. Therefore, if a pipe has been installed for a long time, part of the pipe will be damaged and missing along with the earth and sand around the pipe. There is also a state that keeps.

When such a pipe is lined with the above-mentioned lining material, the inner tube is a plastic tube having no pressure resistance, and the sheet material is simply made by rolling and overlapping both side edges. If the road has a missing portion or is extremely brittle, the lining material will swell indefinitely when the lining material is expanded by fluid pressure, and the lining cannot be properly lined.

FIG. 2 shows this state.
C sheet material 2 is rolled into a cylindrical shape, its both side edges are overlapped at an overlapping portion 5, and an inner tube 4 made of a plastic tube is inserted through the inside thereof.
Is inserted into the conduit 1 having the notch 6, the pressurized fluid is fed into the inner tube 4, and the lining material 3 is expanded.

[0007] In the missing portion 6 of the pipe 1, since there is no function of pressing the lining material 3 from the outside, the sheet material 2
Of the sheet material 2 has been released. If the tube is further advanced from this state, the inner tube 4 may further expand locally at the missing portion 6 and rupture, and the pressure fluid may be ejected.

In FIG. 2, since the overlapping portion 5 of the sheet material 2 coincides with the missing portion 6 of the pipeline 1, the above-described state is obtained. The sheet material 2 expands while being shifted at the overlapping portion 5.
Part of the sheet material 2 is greatly invaded into the missing portion 6, and the overlap of the sheet material 2 is released, or a part of the sheet material 2 is greatly extended and broken at the missing portion 6, so that the pipe line 1 has a large size. If there is the missing portion 6, the lining cannot be properly lined.

[0009] In addition, the surroundings of the pipeline 1 are often filled with groundwater. In such a place, the groundwater enters the pipeline 1 from a damaged portion of the pipeline 1. In particular, in a place where a part of the pipeline 1 is missing, a large amount of water may enter from the missing portion 5 and the inside of the pipeline 1 may be flooded.

When the liner 1 is to be lined by the above-described method, the liner 3 is immersed in water in the line 1, and even if heated from the inner surface of the liner 3, the heat is taken away by the water. .
Therefore, it takes a long time to cure the curable resin liquid of the lining material 3.

Further, since water comes into contact with the surface of the lining material 3,
Curing of the curable resin liquid is inhibited, and the surface portion of the lining material 3 remains uncured forever.

Japanese Patent Application No. Hei 3-1820 filed earlier by the applicant
No. 43 describes a sheet-like material in which the outside is wrapped with a tubular woven fabric to suppress expansion of the lining material 3. This can prevent the lining material 3 from being excessively expanded in the pipeline 1, but cannot prevent the sheet-like material from directly contacting water, and has a cooling action and a hardening inhibition action by water. There is no action to block.

[0013] The present invention has been made in view of such circumstances, and a pipe made of FRP is formed by lining a pipe such as a sewer pipe that has been dropped or becomes extremely brittle, thereby forming a pipe made of FRP on the inner surface. It is an object of the present invention to provide a lining material and a lining method that can cure a curable resin liquid without any problem even if water enters, and can appropriately regenerate a pipeline.

[0014]

According to the lining material of the present invention, a high-strength fiber is dispersed in a curable resin solution, and a thin woven fabric is integrally formed on the outside of a sheet material obtained by thickening the curable resin solution. The extension tube is wrapped in a sheet-like material to be stuck, and both side edges of the sheet-like material are displaceably overlapped with each other, and the outside thereof is covered with a waterproof coating on at least its outer surface over its entire length. It is characterized by being wrapped in a water-tight tubular material made of cloth.

FIG. 1 shows a state in which a pipe 1 is lined with a liner 3 of the present invention in a pipe according to the present invention.

In FIG. 1, reference numeral 7 denotes a sheet-like material. High-strength fibers such as glass fibers are dispersed in a curable resin liquid such as unsaturated polyester, and the curable resin liquid is thickened to form a sheet. A thin woven fabric 8 is integrally attached to the outer surface of the sheet material 2 in FIG.

The sheet 7 is rounded into a tubular shape, and both side edges of the sheet 7 are overlapped so as to be displaceable from each other at the overlapping portion 5.

[0018]

A thin plastic airtight expansion tube 4 is arranged inside the tubular sheet 7.

On the outside of the cylindrical rolled sheet 7, a flexible water-tight cylindrical body 9 is disposed over the entire length thereof. This tubular material 9 is formed by covering at least the outer surface of a woven fabric 10 with a waterproof coating 11.
For example, tarpaulin cloth or waterproof canvas can be used.

In the lining material 3 of the present invention, the expansion tube 4 is wrapped in the sheet material 2 and both side edges thereof are displaceably overlapped with each other.
It is wrapped in and composed.

[0022]

In order to use the lining material 3 of the present invention for lining the pipeline 1, first, the lining material 3 is inserted into the pipeline 1. At this time, the frictional resistance with the pipeline 1 can be reduced by folding the lining material 3 flat and inserting the lining material 3 by bending it into a substantially U-shaped or V-shaped shape.

Then, a pressurized fluid is fed into the expansion tube 4 to inflate the lining material 3, and as shown in FIG.
Along the inside of the Next, a heating medium such as heated steam is fed into the expansion tube 4 and heated to cure the curable resin liquid of the sheet material 2. In addition, by selecting the type of the curable resin liquid, the liquid can be cured by a method other than heating, such as irradiation with ultraviolet rays.

According to the present invention, when the pressurized fluid is fed into the lining material 3 and expanded, the overlapping portions 5 are shifted from each other as in the conventional lining material, so that the diameter is expanded. And closely adheres to the inner surface of the pipeline 1.

If the pipe 1 has sufficient strength, the lining material 3 is heated in this state, and the curable resin liquid is cured to form a rigid FRP pipe.

However, when the pipeline 1 is fragile, the pipeline 1 collapses and is expanded by the pressure in the lining material 3, and the lining material 3 is expanded endlessly and the overlapping portion 5 is opened. There is fear.

When there is a missing portion 6 in a part of the pipeline 1 as shown in FIG. 1, the lining material 3 in that portion enters the missing portion 6 and bulges, and as shown in FIG. The part 5 may open.

Here, in the present invention, a tubular article 9 is arranged outside the tubular sheet article 7, and this tubular article 9 is disposed.
Has a woven fabric 10 and does not expand due to internal pressure,
If the sheet-like material 7 expands until it comes into close contact with the inner surface of the tubular material 9, it cannot be further expanded by being restrained by the tubular material 9.

Therefore, even if the pipe line 1 is brittle or has a missing portion 6, the lining material 3 is excessively expanded to open the overlapping portion 5 of the sheet-like material 7, or the expansion tube 4 is ruptured. Nothing to do.

It is possible that groundwater infiltrates into the pipe 1 from the missing portion 6 and the inside of the pipe 1 becomes flooded.
Even in such a case, since the surface of the lining material 3 is covered with the tubular material 9 and the tubular material 9 is given watertightness by the waterproof coating 11, the infiltration water is reduced to the sheet-like material 7. And does not hinder the curability of the curable resin liquid.

Further, since the space between the sheet-like material 7 to be cured and the water is blocked by the tubular material 9, it is thermally shielded, and the degree to which heat given to the sheet-like material 7 is taken away by the water is low. The sheet material 7 is sufficiently heated and can be rapidly cured.

[0032]

According to the present invention, when forming a lining inside the pipeline 1, it is not necessary to have a strong pipe wall outside the lining material 3, and the missing portion 6 is formed in the pipeline 1. Even so, it is possible to form a strong pipe only by the lining material 3 along the inner surface of the original pipe 1 and repair the damage to the pipe 1.

Further, since the cylindrical material 9 formed on the outer surface of the lining material 3 prevents the intruding water from directly touching the sheet-like material 7, the curability of the curable resin liquid is not impaired by the water. In addition, the heat is not taken away by water, and the curing speed is not excessively reduced, and the sheet-like material can be effectively cured even if there is intruded water.

Therefore, according to the present invention, the pipeline 1 that has been broken down and has become brittle, or the pipeline 1 that has a partially missing portion 6
Lining is not affected by the strength of the tube wall or the missing portion 7, and the hardening of the curable resin liquid is not hindered by the infiltration water. It is possible to form a plastic lining.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a state in which a lining material of the present invention is inserted into a pipeline.

FIG. 2 is a cross-sectional view showing a state where the pipe is lined with a conventional liner having a missing portion by a liner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipeline 2 Sheet material 3 Lining material 4 Expansion tube 5 Overlapping part 7 Sheet material 9 Cylindrical material 10 Woven cloth 11 Waterproof coating

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 B29C 63/00-63/48

Claims (1)

(57) [Claims] 1. A high-strength fiber is dispersed in a curable resin liquid,
Outside the sheet material (2) formed by thickening the curable resin liquid
The expansion tube (4) is wrapped with a sheet-like material (7) integrally laminated with a thin woven fabric (8) on the side, and both side edges of the sheet-like material (7) are overlapped so as to be displaceable, and the outside thereof is further covered with A pipeline comprising at least an outer surface wrapped in a water-tight tubular body (9) made of a woven fabric (10) coated with a waterproof coating (11). Lining material