JP2003231177A - Underground tube repairing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground tube repairing material having a high strength against a tensile force or a crushing force via glass fiber and having a sufficient expansibility as well. <P>SOLUTION: The underground tube repairing material 1 comprises a cylindrical outside resin absorption layer 3, an annular inside resin absorption layer 5 and a cylindrical polyethylene film layer 7 provided at the inside of the layer 5 so that the layer 3 and the layer 5 are impregnated with a thermosetting resin such as an unsaturated polyester resin or the like. The layer 5 is formed of an inside polyester fiber layer 23 and a glass roving cloth layer 25 covering the outer surface of the layer 23 so that an overlapping part 27 is constituted at one position in a circumferential direction. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground pipe repair material used for lining an underground pipe such as a sewer pipe to repair it from the inside.

[0002]

2. Description of the Related Art When repairing an aging sewer pipe,
A tubular repair material impregnated with curable resin is drawn into the sewer pipe, and fluid pressure is applied to the repair material, or the pressure hose is inserted into the repair material while reversing the pressure with fluid pressure (pressure hose A repair method is widely used in which the repair material is pressed against the inner surface of the sewer pipe to cure the curable resin and the inner surface of the sewer pipe is lined. Alternatively, a method is also used in which the repair material itself is inverted by fluid pressure and pressed against the inner surface of the sewer pipe (for example, the inner surface of the mounting pipe) and inserted into the sewer pipe. By using such a repair method, it is possible to repair the sewer pipe without excavating the ground where the sewer pipe is embedded. The repair material has a resin absorption layer formed of, for example, polyester fiber, and a curable resin such as a thermosetting resin is impregnated in the resin absorption layer. A rigid lining layer is formed on the sewage pipe to repair it.

The repair material used in such a repair method is formed to have a diameter slightly smaller than the inner diameter of the sewer pipe to be repaired, and is slightly expanded or expanded by the fluid pressure applied to the inside to be pressed against the inner surface of the sewer pipe. . With such a configuration, it is possible to prevent large wrinkles, undulations and the like from occurring in the lining layer formed by curing the curable resin of the repair material.

By the way, in the sewer pipe buried underground,
Due to the consolidation and fluctuation of the ground, the crushing force and the pulling force to separate the sewer pipe connection part act. Therefore, the lining layer formed on the inner surface of the sewer pipe is required to have sufficient strength to withstand such a crushing force and a pulling force. In order to increase the strength of the lining layer, it is sufficient to form the repair material or the resin absorption layer thick, but if the repair material is thickened, the lining layer also becomes thick and the inner diameter of the sewer pipe becomes too small. The sewage flow function declines.

[0005]

In order to increase the strength of the lining layer without increasing the thickness of the repair material or without increasing the thickness of the repair material, it is necessary to increase the strength in the length direction and the radial direction of the resin absorption layer. It is conceivable to provide glass fiber in the. However, since the glass fiber does not have elasticity or has almost no elasticity,
If glass fibers are arranged in the circumferential direction to increase the strength in the radial direction, the repair material does not expand or expand when fluid pressure is applied, and the repair material can be pressed against the inner surface of the underground pipe. It's gone. In this case, if the fluid pressure is increased to expand or expand the repair material, the repair material may burst.

Therefore, an object of the present invention is to provide an underground pipe repairing material which has a high strength against a tensile force and a crushing force due to the glass fiber and has sufficient expandability or diameter expansion property.

[0007]

The underground pipe repair material of the present invention for attaining this object is pressed against the inner surface of the underground pipe by the fluid pressure applied to the inner side, and is used for repairing the inner surface of the underground pipe. A cylindrical underground pipe repair material impregnated with a curable resin, which forms a lining layer, and which has an annular layer formed by overlapping both widthwise ends of a sheet-shaped glass roving cloth. Is. More specifically, a glass roving cloth, for example, a resin sorbing sheet provided with a glass roving cloth sheet is provided with a resin absorbing annular layer formed by overlapping both widthwise end portions of the resin absorbing sheet. The glass roving cloth is formed by crossing the longitudinal glass roving and the horizontal glass roving at an appropriate angle and knitting, and tensile strength, that is, strength in the repair material length direction, and crushing strength, that is, strength in the repair material radial direction. Can be raised together. In particular, the glass roving cloth is preferably formed of a vertical glass roving extending in the repair material length direction and a horizontal glass roving orthogonal to the vertical glass roving and extending in the repair material circumferential direction. The vertical glass rovings ensure high tensile strength, and the horizontal glass rovings woven into the vertical glass rovings ensure high crushing strength. In the underground pipe repair material of the present invention, when a fluid pressure is applied to the inside, the annular layer or the resin-absorbing annular layer shifts at the overlapping portion to expand and expand in diameter. When the repair material itself is inverted and placed in the underground pipe, the outside of the repair material before the inversion is the inside here.

Fluid pressure is applied to the inside of the underground pipe repair material,
When the underground pipe repair material is expanded or expanded and pressed against the inner surface of the underground pipe, the overlapped state of the annular layer or the resin absorption annular layer is released, and the width of the sheet-like glass roving cloth or resin absorbent sheet If both ends in the direction or both ends in the circumferential direction are separated, the crushing resistance of the formed lining layer may decrease. Therefore,
The annular layer or the resin-absorbing annular layer is preferably formed so that the overlapping state is maintained even when the underground pipe repair material is pressed against the inner surface of the underground pipe. That is, the width of the sheet-shaped glass roving cloth or the resin absorbent sheet is formed to be appropriately longer than the inner peripheral length of the underground pipe.

When a crushing force acts on the underground pipe, and therefore the underground pipe repair material or lining layer, tensile stress is generated along the radial cross section on the outer peripheral surface side and the inner peripheral surface side of the underground pipe repair material. However, the crushing resistance is increased by arranging the glass roving cloth mainly because the tensile strength on the outer peripheral surface side and / or the inner peripheral surface side of the underground pipe repair material is the lateral glass of the glass roving cloth. It is achieved by increasing by roving. Therefore, the annular layer or the resin absorption annular layer is on the outer side (outer peripheral surface side) of the lining layer.
It is effective to be provided so as to be arranged closer to the inside and / or closer to the inner side (inner peripheral surface side).

In particular, when the pressurized fluid is directly applied without using a pressure hose, the annular layer or the resin-absorbing annular layer is surely expanded or expanded in diameter and pressed against the inner surface of the sewer pipe. It is preferable to provide a tubular pressurizing fluid impermeable film layer inside the absorption annular layer.

In order to reliably prevent groundwater from leaching into the underground pipe from the cracked portion of the underground pipe, a tubular impermeable film layer is provided on the outermost side of the underground pipe repair material. It is preferable to set.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an underground pipe repair material according to the present invention.

The underground pipe repair material 1 is for repairing the sewer pipe by a forming method, that is, for drawing the repair material into the sewer pipe and applying a fluid pressure directly to the inner side to repair the sewer pipe. Layer 3, annular inner resin absorption layer 5 (annular layer or resin absorption annular layer), and cylindrical polyethylene film layer 7 provided inside the inner resin absorption layer 5 (cylindrical pressurized fluid impermeable Film layer), and
The outer resin absorption layer 3 and the inner resin absorption layer 5 are impregnated with a thermosetting resin such as unsaturated polyester resin. The tubular film layer 7 may be made of polyurethane or soft vinyl chloride instead of polyethylene. It is also possible to provide a resin absorption layer, for example, a resin absorption fiber layer on the outside of the tubular film layer 7, and integrate the inner resin absorption layer 5 and the film layer 7 provided with the resin absorption layer on the outside. . The outer resin absorption layer 3 includes an inner polyester fiber layer 9, a glass mat layer 11 provided outside so as to cover the polyester fiber layer 9, and a tube provided outside so as to cover the glass mat layer 11. A polyethylene film layer 13 (cylindrical impermeable film layer), for example, a polyethylene film sheet 1
An outer layer sheet material 3 formed by sequentially laminating a glass mat 11A and a sheet-like layer 9A of polyester fiber on 3A.
A (see FIG. 2) is a sheet-like layer 9 of polyester fiber.
This outer layer sheet material 3 is rolled up so that A is on the inside.
Both ends 15 and 17 in the width direction of A are butted, and joining bands 19 and 21 extending in the lengthwise direction are joined to the inside and outside of the butted portion to form a tubular body. The glass mat 11A is formed by randomly arranging short glass fibers and bonding them with a binder, and has a slight reinforcing effect and elongation or stretchability. The inner joint band 19 is formed thick to ensure sufficient joint strength, and is formed by laminating a polyester fiber layer and a glass roving layer. The outer joint band 21 is a polyethylene film. And is formed thin so that no large gap or step is formed between the polyethylene film layer 13 and the inner surface of the sewer pipe.

The inner resin absorption layer 5 is composed of an inner polyester fiber layer 23 and a glass roving cloth layer 25 (annular layer) provided on the outer side so as to cover the polyester fiber layer 23. The wrap portion 27 is configured. The inner resin absorption layer 5 may be composed of an inner glass roving cloth layer 25 and a polyester fiber layer provided outside so as to cover the glass roving cloth layer 25. The inner resin absorption layer 5 is formed by, for example, stacking a sheet-shaped glass roving cloth 25A with a sheet-shaped layer 23A of polyester fiber to form an inner-layer sheet material 5A (resin-absorbent sheet: see FIG. 3) and using a polyester fiber. Sheet-like layer 2
The inner layer sheet material 5A is rounded so that 3A is on the inner side, and the widthwise both ends 29 and 31 of the inner layer sheet material 5A are overlapped with each other, so that the overlapping portion 27 is formed into an annular body. The inner resin absorption layer 5 is formed by arranging the tubular polyethylene film that constitutes the polyethylene film layer 7 inside and enclosing it. The glass roving cloth 25A is formed by knitting a vertical glass roving 33 and a horizontal glass roving 35. In this glass roving cloth 25A, the vertical glass roving 33 extends in the longitudinal direction and the horizontal glass roving 35 extends vertically. Vertical glass roving 3 so that it is woven into glass roving 33 and extends in the width direction.
3 and the horizontal glass roving 35 are arranged orthogonally. One horizontal glass roving 35 is knitted by alternately passing through the upper side and the lower side of a plurality of longitudinal glass rovings 33 arranged side by side, and the one horizontal glass roving 35 and the adjacent horizontal glass roving 35 are Contrary to the one horizontal glass roving 35, the lower and upper vertical glass rovings 33 are alternately passed and knitted. Therefore, in the glass roving cloth layer 25, the vertical glass rovings 33 extend in the repair material length direction, and the horizontal glass rovings 35 are woven into the vertical glass rovings 33 and extend in the repair material circumferential direction.

The underground pipe repair material 1 is, for example, an inner layer sheet material 5A formed into an annular body by impregnating an outer layer sheet material 3A and an inner layer sheet material 5A with a thermosetting resin such as unsaturated polyester resin. That is, it is configured by wrapping the inner resin absorption layer 5 and forming the outer layer sheet material 3A on the cylindrical body, that is, the outer resin absorption layer 3. The polyethylene film layer 7 in the inner resin absorbent layer 5 is formed by wrapping the inner resin absorbent layer 5 to form the outer resin absorbent layer 3 and then inverting the tubular polyethylene film in the inner resin absorbent layer 5. Can be arranged and configured.

FIG. 4 is a view showing a state in which the underground pipe repair material 1 is drawn into the sewer pipe to repair the sewer pipe.

The underground pipe repair material 1 is formed to have a length for repairing the sewer pipe 37 over its entire length, and has an opening at one end (front end) in the length direction and the other end (rear end) in the length direction. Plugs 39 and 41 are attached to the respective openings of the plugs. The underground pipe repair material 1 is drawn into the sewer pipe 37 so that the tip end portion is located at one end portion in the length direction of the sewer pipe 37 and the rear end portion is located at the other end portion in the length direction of the sewer pipe 37. Are arranged.

FIG. 5 is a view showing a lining layer formed on the inner surface of the sewer pipe 37.

After the underground pipe repairing material 1 is drawn into the sewer pipe 37 and arranged, the tubular polyethylene film layer 7 inside the inner resin absorbing layer 5 is inserted from the plug 41 at the rear end of the underground pipe repairing material 1. Supply pressurized water to the inside. The diameter of the underground pipe repair material 1 or the diameter of the outer resin absorption layer 3 is formed to be slightly smaller than the inner diameter of the sewer pipe 37, and the inner resin absorption layer 5 is formed into an annular body having a smaller diameter than the outer resin absorption layer 3. However, the polyethylene film layer 7 is expanded by being pressed by the pressurized water and presses the inner resin absorption layer 5 from the inside. The inner resin absorption layer 5 is pushed from the inside by the polyethylene film layer 7 and expands in diameter so as to shorten the overlap portion 27. The outer resin absorption layer 3 is pressed from the inner side by the expanding inner resin absorption layer 5, expanded in diameter and pressed against the inner surface of the sewer pipe 37, and the whole underground pipe repair material 1 is pressed against the inner surface of the sewer pipe 37. .

When the underground pipe repair material 1 is pressed against the inner surface of the sewer pipe 37, pressurized water is discharged from the plug 39 at the front end and hot water is supplied from the plug 41 at the rear end to supply the underground pipe repair material 1 The thermosetting resin therein is cured to form the lining layer 43 on the inner surface of the sewer pipe 37.

FIG. 6 is a view for explaining a stress situation when the crushing force acts on the lining layer 43 formed on the inner surface of the sewer pipe 37.

When, for example, a downward crushing force (see arrow A) acts on the sewer pipe 37, the underground pipe repair material 1
Alternatively, in the upper part of the lining layer 43, a compressive stress (see arrow B) is generated on the outer peripheral surface side along the radial cross section,
Tensile stress (see arrow C) is generated along the radial cross section on the inner peripheral surface side. Therefore, the glass roving cloth layer 25 is arranged on the inner peripheral surface side of the underground pipe repair material 1 or the lining layer 43, and the high tensile strength of the horizontal glass roving 35 of the glass roving cloth layer 25 causes the underground pipe repair material 1 or If the tensile strength on the inner peripheral surface side of the lining layer 43 is large, the underground pipe repair material 1 or the lining layer 4
3 has a high resistance against the crushing force. In the underground pipe repair material 1 or the lining layer 43, the thickness of the outer resin absorption layer 3 is 5.5 mm or more, and the inner resin absorption layer 5 is
Has a thickness of 1.0 mm or more. For example, since the inner resin absorption layer 5 is formed thinner than the outer resin absorption layer 3,
The glass roving cloth layer 25 is arranged on the inner peripheral surface side of the underground pipe repair material 1 or the lining layer 43, and the vertical glass roving 33 of the glass roving cloth layer 25 ensures not only high tensile strength but also lateral width. High crushing strength is secured by the glass roving 35.

By the way, when a downward crushing force (see arrow A) is applied to the sewer pipe 37, in the left and right side portions of the underground pipe repair material 1 or the lining layer 43, the inner pipe surface is compressed along the radial cross section. Although stress (see arrow B ') is generated, tensile stress (see arrow C') is generated on the outer peripheral surface side along the radial cross section. Therefore, even if the glass roving cloth layer 25 is arranged not on the inner peripheral surface side but on the outer peripheral surface side of the underground pipe repairing material 1 or the lining layer 43, the underground pipe repairing material 1 or the lining layer 43 resists the crushing force. It will have a high resistance. In order to secure a higher resistance against the crushing force, the glass roving cloth layer 25 is arranged on the outer peripheral surface side and the inner peripheral surface side of the underground pipe repair material 1 or the lining layer 43, respectively.

[0025]

As described above, since the underground pipe repair material of the present invention contains the glass roving cloth, it has sufficient tensile strength and crushing strength, and also exerts an appropriate fluid pressure. As a result, it can be pressed against the inner surface of the underground pipe without any hindrance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an underground pipe repair material according to the present invention.

FIG. 2 is a diagram showing a configuration of an outer layer sheet material.

FIG. 3 is a diagram showing a configuration of an inner layer sheet material.

FIG. 4 is a diagram showing a state in which an underground pipe repair material is drawn into the sewer pipe to repair the sewer pipe.

FIG. 5 is a view showing a lining layer formed on the inner surface of the sewer pipe.

FIG. 6 is a diagram for explaining a stress situation when a crushing force acts on a lining layer formed on the inner surface of a sewer pipe.

[Explanation of symbols]

1 Underground pipe repair material 5 Inner resin absorption layer (annular layer or resin absorption annular layer) 5A Inner layer sheet material (resin absorbent sheet) 7 Cylindrical polyethylene film layer (cylindrical pressurized fluid impermeable film) Layer) 13 Cylindrical polyethylene film layer (cylindrical impermeable film layer) 25 Glass roving cloth layer (annular layer) 25A Sheet-shaped glass roving cloth 27 Overlap portions 29, 31 Width direction of sheet material for inner layer Both ends 37 Sewer pipe (underground pipe) 43 Lining layer

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Claims (9)

[Claims] 1. A cylindrical underground pipe repair material impregnated with a curable resin, which is pressed against the inner surface of the underground pipe by a fluid pressure applied to the inside to form a lining layer for repair on the inner surface of the underground pipe. An underground pipe repair material, comprising an annular layer formed by overlapping both widthwise ends of a sheet-shaped glass roving cloth. 2. A tubular underground pipe repair material impregnated with a curable resin, which is pressed against the inner surface of the underground pipe by a fluid pressure applied to the inside to form a lining layer for repair on the inner surface of the underground pipe. The underground pipe repair material is characterized by comprising a resin-absorbing annular layer formed by overlapping both widthwise ends of a resin-absorbing sheet provided with a glass roving cloth. 3. The underground pipe repair material according to claim 1, wherein the annular layer is formed so as to maintain an overlapping state when pressed against the inner surface of the underground pipe. 4. The underground pipe repair according to claim 2, wherein the resin absorption annular layer is formed so as to maintain an overlapping state when pressed against the inner surface of the underground pipe. Material. 5. The underground pipe according to claim 1, wherein the annular layer is provided so as to be arranged on an outer side and / or an inner side of the lining layer. Repair material. 6. The ground according to claim 2, wherein the resin-absorbing annular layer is provided so as to be arranged on an outer side and / or an inner side of the lining layer. Medium pipe repair material. 7. The underground pipe repair material according to claim 1, wherein a tubular pressurized fluid impermeable film layer is provided inside the annular layer. 8. The underground pipe repair according to claim 2, wherein a tubular pressurized fluid impermeable film layer is provided inside the resin absorption annular layer. Material. 9. A cylindrical water-impermeable film layer is provided on the outermost side, and the cylindrical water-impermeable film layer is provided.
Underground pipe repair material according to 3, 4, 5, 6, 7 or 8.