JPH0450591A - Reversing lining process - Google Patents

Abstract

PURPOSE:To prevent the convolution of air at the time of reversing an inner lining material by applying a thermosetting resin on the inner part so as not to generate the convolution of the air, by setting an impregnated hose in a preliminarily set pipe, and by reversing and inserting the inner lining material for which the thermosetting resin is impregnated, into the hose under a condition that the air is exhausted. CONSTITUTION:A hose 3 is a long soft film hose formed out of an inner layer 6 for reinforcing strength, and of a non-permeable film 7. The hose 3 is cut by the length longer than a preliminarily set pipe 1 for lining an inner lining material, and then a liquid thermosetting resin is applied thereto, and is impregnated. When a pressure fluid is continuously supplied from a storing container 13, a reversing part 4a of the inner lining material 4 proceeds the soft hose 3 arranged in the preliminarily set pipe 1 through the inner wall of the preliminarily set pipe 1, in such a way that it is enlarged and clad. When the reversing part 4a is proceeded, since a resin accumulation without air convolution is formed by the void space between the reversing part 4a and the hose 3, the number of the pin-hole generated on the pressure part of the inner lining material 4 and the hose 3 is drastically reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an inversion lining construction method that can be applied to all existing pipes such as sewerage, waterworks, and oil pipes.

[Conventional technology] In recent years, for the purpose of reinforcing the strength of existing pipes such as sewerage and water supply pipes, preventing corrosion, preventing water leakage and flooding, and improving flow rate,
Inversion lining methods, which involve lining the inner surface of existing pipes with synthetic resin or forming synthetic resin on the inner surface of existing pipes, are attracting attention.

For example, Japanese Patent Publication No. 55-43890, Japanese Patent Application Publication No. 64-
The construction method disclosed in Publication No. 85738 etc. uses a flexible impermeable membrane in which the outer layer is made of synthetic resin, and the inner layer is a resin-impregnated layer of woven or nonwoven fabric impregnated with a liquid thermosetting resin such as epoxy or polyester. The tip of the material is inverted and fixed in an annular shape, and while supplying pressurized fluid inside, the material is inverted and inserted into the existing pipe using the pressure difference between atmospheric pressure and atmospheric pressure. In this method, this inverted lining material is pressed onto the inner surface of the existing pipe using fluid pressure, and the thermosetting resin is cured using heated and pressurized fluid to line the inner surface of the existing pipe with synthetic resin.

[Problems to be Solved by the Invention] The resin-impregnated layer of the lining material used in the above-mentioned inversion lining method before inversion is vacuum-impregnated with a thermosetting resin, so the inside is deaerated in this state. The pinhole content is reduced.

However, when the lining material turns over and moves inside the existing pipe, the inner resin-impregnated layer contacts the atmosphere, turns outward, and presses against the inner surface of the existing pipe, thereby entraining air. This trapped air diffuses into the resin-impregnated layer, and many pinholes are generated in the lining layer after hardening. For this reason, there was a disadvantage that the strength of the formed lining layer varied.

In addition, since the inverted resin-impregnated layer is directly pressed against the inner surface of the existing pipe, if there is a gap caused by a branch pipe part of the existing pipe, a shift or loss at the joint part, or a crack in the pipe body, the resin impregnation layer will be applied during the pressing process after the inversion. The thermosetting resin of the layer seeps into the voids,
In addition to reducing the strength around the voids, the thermosetting resin loses its viscosity before it gels due to heating, causing it to flow out along with underground water, resulting in a porous lining layer.
Another disadvantage was that the strength was significantly reduced.

Furthermore, if there are many pinholes or porous defects in the lining layer, the contents inside the tube will gradually diffuse and permeate the thin impermeable membrane during long-term use, causing premature damage from these defects. There was also a risk of leakage to the outside.

This invention was made to solve these shortcomings, and it prevents the entrainment of air when the lining material is turned over and inserted into the existing pipe, and also prevents the thermosetting resin from flowing out when the lining material is suppressed and heated. The purpose of this invention is to provide an inversion lining construction method that can prevent this.

[Means for Solving the Problems] The inversion lining construction method according to the present invention has a single layer structure of an impermeable membrane made of synthetic resin, or a flexible multilayer structure having a woven or nonwoven fabric on the inner surface of the impermeable membrane. The inside of the hose is degassed, a thermosetting resin is applied, impregnated and sealed, and the flexible hose is inserted into the existing pipe in a flat state, and the outer layer is made of a flexible impermeable membrane, and the inner layer is made of a flexible impermeable membrane. One end of a hollow cylindrical flexible lining material made of a resin-impregnated layer of woven or non-woven fabric impregnated with a thermosetting resin is folded back and inverted, and the inverted part is brought close to one end of the upper hose. , Overlap the end of the hose on the folded surface of the lining material and secure it.
The reversed part of the lining material is placed inside the hose, and the space formed by the reversed part of the lining material and the inner surface of the end of the hose is filled with thermosetting resin while degassing, and pressurized fluid is supplied to the inside of the lining material. The lining material is then reversed and inserted into the hose.

[Function] In the present invention, the inside of the flexible hose is deaerated, and furthermore, a vacuum-defoamed thermosetting resin is applied, impregnated, and sealed to eliminate as much air as possible inside the hose.

Insert this hose in a flat state into the existing pipe, bring the inverted part formed by folding back one end of the lining material close to one end, and overlap the end of the hose on the folded surface of the lining material. An inverted portion of the lining material is formed within the hose by fixing and placing the inverted portion of the lining material inside the hose.

By deaerating the space formed by the inverted portion of the lining material and the inner surface of the end of the hose and filling it with thermosetting resin, a resin reservoir is formed while preventing air from entering the thermosetting resin.

Then, by inverting and advancing the lining material, the resin reservoir is advanced into the hose, and the resin-impregnated layer of the lining material is pressed against the inner surface of the hose without exposing it to the atmosphere.

[Example] FIG. 1 is a sectional view showing a construction state by an inverted lining method according to an example of the present invention. In the figure, 1 is an existing pipe buried underground 2, 3 is a hose inserted into the existing pipe 1, 4 is a lining material, and 5 is a guide tube connected to a storage tank (not shown).

As shown in FIG. 2, the hose 3 includes a reinforcing inner layer 6 made of a woven fabric such as nylon, polypropylene, or glass that has tensile strength and is relatively heat resistant.
It is a long flexible film hose formed of an inner layer 6 and an impermeable membrane 7 coated with a laminate on the inner and outer screens or the outer surface. The impermeable membrane 7 is formed of a thermoplastic elastomer such as polyolefin, polyurethane, or polyester to a thickness of about 0.5 mm, either as a single layer structure or as a multilayer structure coextruded with other resins.

This hose 3 is an existing pipe lining the lining material 4.
After cutting to length, apply liquid thermosetting resin such as epoxy or polyester to the inner surface.

Impregnate.

When applying and impregnating the inner surface of the hose 3 with a liquid thermosetting resin, as shown in FIG.
The resin pool 8 is pressed with a roller 9, for example, and moved while degassing to eliminate air entrainment, and is spread over the entire length.
Coat and impregnate the entire inner layer 6. After applying and impregnating the thermosetting resin, both ends of the hose 3 are sealed to prevent air from entering from both ends of the hose 3.

In this way, the amount of air trapped in the thermosetting resin coated and impregnated into the flexible hose 3 can be extremely reduced.

As shown in FIG. 4, the lining material 4 consists of an impermeable membrane 10 as an outer layer and a resin-impregnated layer 11 as an inner layer.

The resin-impregnated layer 11 is made of polyester, glass, acrylic,
Made of woven or non-woven fabric such as Kevlar, it is suitable for existing pipes.
The thickness is selected to provide durability depending on the depth of the pipe, underground water level, etc., and the deterioration and damage of the existing pipe.

The impermeable membrane 10 is made of polyolefin, polyurethane,
It is made of a single-layer film such as polyester or a film coextruded with other resins, and is formed by heat-sealing or adhering to the outer surface of the resin-impregnated layer 11, or by extruding molten resin through a slit and heat-sealing it. do.

The entire length of the resin-impregnated layer 11 of the lining material 4 is uniformly impregnated with a thermosetting resin that has been degassed using a vacuum pump. The lining material 4 impregnated with a thermosetting resin is processed into a flat shape or is flattened and bent, as shown in FIG.

When forming a lining layer inside an existing pipe l using this flexible hose 3 and lining material 4, first, as shown in FIG.
, and connect the flexible hose 3 coated and impregnated with thermosetting resin to one end of the string I2. Next, connect the string 12 from the other end.
The hose 3 is pulled out over the entire length of the existing pipe 1 and installed at the inner bottom of the existing pipe 1.

In this state, as shown in FIG. The lining material 4, which has been wound up or bent, is stored in a storage tank 13 while being pulled out through a take-out port 15 and passed through a guide tube 5.

This storage tank 13 is installed at a construction site close to the existing pipe 1, for example, near a manhole when the existing pipe 1 is a sewer pipe.

Next, the lining material locking portion 5a at the tip of the guide tube 5 and the tip of the lining material 1 are placed close to the end of the flexible hose 3 disposed within the existing pipe 1.

Then, as shown in FIG. 6, the tip of the lining material 4 is folded back so that the resin-impregnated layer 11 is on the outside, and the tip of the flexible hose 3 is placed on the outside to cover the lining material locking portion 5a of the guide tube 5. Fix it with a steel pant 16. Next, pressure fluid is supplied from the storage tank 13 to the inside 17 of the guide tube 5, and the reversed portion 4a of the lining material 4 is advanced a little, for example, about 1 m or less. As a result, the lining material 1 is expanded and tensed both in the diametrical direction and in the longitudinal direction.

Thereafter, as shown in FIG. 1, through holes 17 and 18 are made in the tip of the flexible hose 3, a vacuum pump 19 is connected to one of the through holes 17, and a thermosetting resin is injected into the other through hole 18. A pressure pump 20 for pressure feeding is connected. Then, the vacuum pump 19 is driven to connect the reversed portion 4a of the lining material 4 and the hose 3.
The thermosetting resin is press-fitted into the void space 21 by driving the pressure pump 20 while deaerating the void space 21 formed by the inner surface of the thermosetting resin. By this deaeration and press-fitting of the thermosetting resin, a resin reservoir without air entrainment can be formed in the void space 21.

Thereafter, when pressurized fluid is continuously supplied from the storage tank 13, the inverted portion 4a of the lining material 4 advances while expanding and crimping the flexible hose 3 disposed inside the existing pipe 1 to the inner wall of the existing pipe 1. When the reversing section 4a advances, the void space between the reversing section 4a and the hose 3 forms a resin pool without air entrainment, so pinholes that occur at the pressure contact between the lining material 4 and the hose 3 are greatly reduced. can do. In this way, the lining material 4 is reversed and inserted over the entire length of the existing pipe 1.

After inverting and inserting the lining material 4 over the entire length of the existing pipe 1, while keeping the lining material 4 and hose 3 pressed against the inner wall of the existing pipe 1 with pressure fluid, if the pressure fluid is a liquid,
Room temperature water is converted into hot water by a heat source such as a boiler and then supplied from the storage tank 13, and if the pressure fluid is a gas,
Heated steam is circulated and supplied from the inside of the lining material 4 to raise and maintain the temperature at a temperature suitable for curing the thermosetting resin, thereby curing the thermosetting resin. When the lining material 4 and hose 3 are cured in this way, as shown in FIG.
A lining layer 22 with extremely few pinholes can be formed on the inner surface of the lining.

In the above embodiment, the hose 3 is formed of the inner layer 6 for strength reinforcement and the impermeable membrane 7, but as shown in FIG. Alternatively, a hose 3a provided with a thin resin-impregnated layer 23 of about 5 mm may be used.

When applying and impregnating this hose 3a with a thermosetting resin, as shown in FIG. By injecting the resin all at once and degassing the resin-impregnated layer 23 with the vacuum pump 24, and moving the resin reservoir 8 sequentially with the roller 9, the resin is uniformly poured over the entire length of the inner surface of the hose 3a, preventing air from being entrained. can be applied and impregnated.

Further, when a film of nylon, polyethylene, polyester, etc. having strength and heat resistance of 80° C. or higher is used as the impermeable membrane 7, the hose 3 may be formed of a single layer of this film.

[Effects of the Invention] As explained above, according to the present invention, a thermosetting resin is coated inside so as to prevent air from being entrained.

The impregnated hose was installed inside the existing pipe, and the lining material impregnated with thermosetting resin was turned over and inserted into the hose with air excluded, so that when the lining material was turned over, the air Entanglement can be prevented.

Therefore, the number of pinholes after the thermosetting resin is cured can be greatly reduced, and a good lining layer with uniform strength can be formed.

In addition, since the inverted resin-impregnated layer of the lining material is pressed against the hose and not directly against the inner surface of the existing pipe, even if there is a gap due to a branch pipe of the existing pipe, a shift or loss at the joint, or a crack in the pipe body. This prevents the thermosetting resin in the resin-impregnated layer from seeping into the voids during the pressing process after reversing, and allows the thermosetting resin to be evenly distributed, thereby preventing a decrease in strength due to lack of resin. be able to.

Furthermore, since the formed lining layer has no pinholes or defects due to lack of resin, the contents inside the tube will gradually diffuse and permeate and will not leak to the outside, allowing stable use for a long period of time. .

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the construction state by the inverted lining method according to the embodiment of the present invention, Fig. 2 is a perspective view showing the hose of the above embodiment, and Fig. 3 is a hose coated with thermosetting resin and impregnated with thermosetting resin. Fig. 4 is a perspective view showing the lining material, Fig. 5 is a sectional view showing the state in which the hose is installed in the existing pipe, and Fig. 6 shows the connection state of the hose and the lining material. 7 is a sectional view showing a lining layer formed in an existing pipe, FIG. 8 is a perspective view showing a hose of another embodiment, and FIG. 9 is a thermosetting hose shown in FIG. 8. FIG. 3 is a perspective view showing a state when applying and impregnating a resin. l... Existing pipe, 3... Hose, 4... Lining material, 5... Guide tube, 6... Inner layer, 7
゜10... Impermeable membrane, 11... Resin impregnated layer,
13...Storage tank, 19...Vacuum pump, 20...
...Pressure pump.

Claims (1)

[Claims] A flexible hose with a single layer structure of an impermeable membrane made of synthetic resin or a multilayer structure with woven or nonwoven fabric on the inner surface of the impermeable membrane is degassed, and thermosetting resin is removed. After coating, impregnating and sealing, the flexible hose is inserted into the existing pipe in a flat state, and the outer layer is made of a flexible impermeable membrane and the inner layer is a woven or non-woven fabric impregnated with a thermosetting resin. Fold and invert one end of a hollow cylindrical flexible lining material made of a resin-impregnated layer, bring the inverted part close to one end of the hose, and overlap the end of the hose on the folded surface of the lining material. fixed,
The reversed part of the lining material is placed inside the hose, and the space formed by the reversed part of the lining material and the inner surface of the end of the hose is filled with thermosetting resin while degassing, and pressurized fluid is supplied to the inside of the lining material. This is an inverted lining construction method that is characterized by inverting and inserting the lining material into the hose.