JP4288318B2 - Underground pipe repair material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an underground pipe repair material used when an underground pipe such as a sewer pipe is lined and repaired from the inside.
[0002]
[Prior art]
When repairing an aged sewer pipe, pull the cylindrical repair material impregnated with curable resin into the sewer pipe and apply fluid pressure to the repair material, or invert the pressurized hose with fluid pressure. The repair method is to insert the repair material into the repair material (by applying fluid pressure through the pressure hose), press the repair material against the inner surface of the sewer pipe, cure the curable resin, and line the inner surface of the sewer pipe. Widely used. Alternatively, a method may be used in which the repair material itself is pressed against the inner surface of the sewer pipe (for example, the inner surface of the attachment pipe) while being inverted by the fluid pressure and inserted into the sewer pipe. By using such a repair method, the sewage pipe can be repaired without digging back the ground in which the sewage pipe is embedded. The repair material has, for example, a resin absorption layer formed from polyester fiber, and the resin absorption layer is impregnated with a curable resin such as a thermosetting resin, and the curable resin is cured to cure the inner surface of the sewage pipe. Thus, a lining layer having rigidity is formed, and the sewer pipe is repaired.
[0003]
The repair material used in such a repair method is formed to have a diameter slightly smaller than the inner diameter of the sewage pipe to be repaired, and is slightly expanded or expanded by the fluid pressure applied to the inner side and pressed against the inner surface of the sewage pipe. By comprising in this way, it is prevented that a big wrinkle, a wave | undulation, etc. arise in the lining layer formed when the curable resin of a repair material hardens | cures.
[0004]
By the way, a crushing force or a pulling force for separating the sewer pipe connection portion acts on the sewer pipe buried in the ground due to consolidation or fluctuation of the ground. Therefore, the lining layer formed on the inner surface of the sewer pipe is required to have a strength that can sufficiently withstand such a crushing force and a tensile force. In order to increase the strength of the lining layer, the repair material or the resin absorption layer may be formed thicker. However, if the repair material is increased, the lining layer also becomes thicker and the inner diameter of the sewer pipe becomes too small. Sewage flow function is reduced.
[0005]
[Problems to be solved by the invention]
In order to increase the strength of the lining layer without increasing the thickness of the repair material or without increasing so much, it is conceivable to provide the resin absorption layer with glass fibers so that the strength in the length direction and the radial direction is increased. . However, since glass fiber does not have stretchability or has almost no stretchability, for example, if glass fiber is disposed in the circumferential direction so that the strength in the radial direction is increased, it is repaired when fluid pressure is applied. The material does not expand or expand, and the repair material cannot be pressed against the inner surface of the underground pipe. In this case, if the fluid pressure is increased to expand or expand the repair material, the repair material may burst.
[0006]
Then, this invention has the high intensity | strength with respect to tensile force and crushing force with glass fiber, and also aims at provision of the underground pipe repair material provided with sufficient expansibility or diameter expansion property.
[0007]
[Means for Solving the Problems]
In order to achieve this object, the underground pipe repair material of the present invention is pressed against the inner surface of the underground pipe by the fluid pressure applied to the inside, and forms a lining layer for repair on the inner surface of the underground pipe. It is a tubular underground pipe repair material impregnated with a resin, and is basically provided with an annular layer formed by overlapping both ends in the width direction of a sheet-like glass roving cloth. . More specifically, it is configured to include a resin-absorbing annular layer formed by overlapping both end portions in the width direction of a resin absorbent sheet provided with a glass roving cloth, for example, a glass roving cloth sheet. The present invention includes an inner resin-absorbing annular layer and an outer resin-absorbing layer disposed outside the resin-absorbing annular layer so as to accommodate the resin-absorbing annular layer, and the resin-absorbing annular layer is made of glass. It is formed by forming the resin absorbent sheet into an annular body so that the roving cloth is on the outside, and is formed thinner than the outer resin absorption layer. The thickness of the outer resin absorption layer is preferably 5.5 mm or more, and the thickness of the inner resin absorption ring layer is preferably 1.0 mm or more. Glass roving cloth is formed by crossing vertical glass roving and horizontal glass roving at an appropriate angle and knitting. Tensile strength, that is, strength in the length direction of the repair material, and crushing strength, that is, strength in the radial direction of the repair material. Both can be improved. 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 extending in the repair material circumferential direction orthogonal to the vertical glass roving. High tensile strength is ensured by the vertical glass roving, and high crushing strength is ensured by the horizontal glass roving knitted on the vertical glass roving. In the underground pipe repair material of the present invention, when fluid pressure is applied to the inside, the annular layer or the resin-absorbing annular layer is shifted in diameter at the overlap portion and expands. 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.
[0008]
When fluid pressure is applied to the inside of the underground pipe repair material to expand or expand the underground pipe repair material and press it against the inner surface of the underground pipe, the overlap state of the annular layer or the resin absorbing annular layer is released. If the sheet-like glass roving cloth or both ends in the width direction or both ends in the circumferential direction of the resin absorbent sheet are separated, the crushing resistance of the formed lining layer may be reduced. Therefore, it is preferable that the annular layer or the resin-absorbing annular layer is 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-like glass roving cloth or the resin absorbent sheet is formed to be appropriately longer than the inner peripheral length of the underground pipe.
[0009]
By the way, when a crushing force acts on the underground pipe, and hence the underground pipe repair material or the 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 increase in the crushing resistance by arranging the glass roving cloth is mainly because the tensile strength on the outer peripheral surface side and / or inner peripheral surface side of the underground pipe repair material is increased by the lateral glass roving of the glass roving cloth. Is achieved. Therefore, it is effective that the annular layer or the resin-absorbing annular layer is provided so as to be disposed on the outer side (outer peripheral surface side) and / or on the inner side (inner peripheral surface side) of the lining layer. However, a glass mat layer may be provided on the outer peripheral surface side of the underground pipe repair material.
[0010]
In particular, when a pressurized fluid is directly applied without using a pressurized hose, the annular layer or the resin absorbing annular layer is used to reliably expand or expand the annular layer or the resin absorbing annular layer and press it against the inner surface of the sewer pipe. It is preferable to provide a cylindrical pressurized fluid-impermeable film layer on the inner side.
[0011]
In addition, in order to prevent groundwater from leaching into the underground pipe from the cracked part of the underground pipe, a cylindrical impermeable film layer may be provided on the outermost side of the underground pipe repair material. preferable.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
FIG. 1 is a sectional view of an underground pipe repair material according to the present invention.
[0014]
The underground pipe repair material 1 is for repairing a sewage pipe by a forming method, that is, by drawing a repair material into the sewage pipe and directly applying fluid pressure to the inside thereof. , Annular inner resin absorption layer 5 (annular layer or resin absorption annular layer) and cylindrical polyethylene film layer 7 (cylindrical pressurized fluid impermeable film layer provided inside inner resin absorption layer 5 The outer resin absorption layer 3 and the inner resin absorption layer 5 are impregnated with a thermosetting resin such as an unsaturated polyester resin. The tubular film layer 7 may be made of polyurethane or soft vinyl chloride as a material instead of polyethylene. It is also possible to integrate a resin absorption layer, for example, a resin absorption fiber layer outside the cylindrical film layer 7 and integrate the inner resin absorption layer 5 and the film layer 7 provided with a resin absorption layer 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 cylinder provided outside so as to cover the glass mat layer 11. For example, a glass film 11A and a polyester fiber sheet-like layer 9A are sequentially laminated on a polyethylene film sheet 13A. The outer layer sheet material 3A (see FIG. 2) is rounded so that the polyester fiber sheet-like layer 9A is on the inner side, but the widthwise ends 15 and 17 of the outer layer sheet material 3A are butted, and the inside of the butted portion and A cylindrical body is formed by joining joining bands 19 and 21 extending in the lengthwise direction to the outside. The glass mat 11A is formed by randomly arranging short-fiber glass fibers and bonding them with a binder, and has a slight reinforcing effect and elongation or stretchability. The joining band 19 located on the inner side is formed thick in order to ensure sufficient joining strength, and is formed by laminating a polyester fiber layer and a glass roving layer. The joining band 21 located on the outer side is a polyethylene film. It is thinly formed so that no large gap or step is formed between the polyethylene film layer 13 and the inner surface of the sewer pipe.
[0015]
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, and an overlap portion 27 at one place in the circumferential direction. Is configured. The inner resin absorbing 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, forming an inner layer sheet material 5A (resin absorbent sheet: see FIG. 3) formed by laminating a sheet-like layer 23A of polyester fibers on a sheet-like glass roving cloth 25A with polyester fibers. The sheet-like layer 23 </ b> A is rounded so as to be on the inner side, and both end portions 29, 31 in the width direction of the inner-layer sheet material 5 </ b> A are overlapped to form an annular body in which the overlap portion 27 is configured. The inner resin absorption layer 5 is formed by placing and enclosing a cylindrical polyethylene film that will constitute the polyethylene film layer 7. The glass roving cloth 25A is formed by knitting vertical glass rovings 33 and horizontal glass rovings 35. In this glass roving cloth 25A, the vertical glass rovings 33 extend in the length direction, and the horizontal glass rovings 35 are longitudinal. The vertical glass roving 33 and the horizontal glass roving 35 are arranged orthogonally so as to be knitted on the glass roving 33 and extend in the width direction. One horizontal glass roving 35 is knitted by alternately passing the upper side and the lower side of a number of vertical glass rovings 33 arranged side by side. Opposite to the two horizontal glass rovings 35, the vertical glass rovings 33 are knitted by passing alternately below and above the upper side. Therefore, in the glass roving cloth layer 25, the vertical glass roving 33 extends in the repair material length direction, and the horizontal glass roving 35 is knitted on the vertical glass roving 33 and extends in the repair material circumferential direction.
[0016]
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 an unsaturated polyester resin. It is configured by wrapping the resin absorption layer 5 and forming the outer layer sheet material 3 </ b> A on the cylindrical body, that is, the outer resin absorption layer 3. The polyethylene film layer 7 in the inner resin absorption layer 5 is formed by wrapping the inner resin absorption layer 5 to form the outer resin absorption layer 3, and then inverting the cylindrical polyethylene film in the inner resin absorption layer 5. Can be arranged and configured.
[0017]
FIG. 4 is a diagram illustrating a state in which the underground pipe repair material 1 is drawn into the sewer pipe in order to repair the sewer pipe.
[0018]
The underground pipe repair material 1 is formed to a length that repairs the sewage pipe 37 over its entire length, and has an opening at one end in the length direction (front end) and an opening at the other end in the length direction (rear end). Plugs 39 and 41 are respectively attached to the. The underground pipe repair material 1 is drawn into the sewage pipe 37 such that the front end is located at one end in the length direction of the sewage pipe 37 and the rear end is located at the other end in the length direction of the sewage pipe 37. Arranged.
[0019]
FIG. 5 is a view showing a lining layer formed on the inner surface of the sewer pipe 37.
[0020]
After the underground pipe repair material 1 is drawn into the sewer pipe 37 and disposed, pressurized water is injected from the plug 41 at the rear end of the underground pipe repair material 1 into the cylindrical polyethylene film layer 7 inside the inner resin absorption layer 5. Supply. The diameter of the underground pipe repair material 1 or the diameter of the outer resin absorption layer 3 is slightly smaller than the inner diameter of the sewer pipe 37, and the inner resin absorption layer 5 is formed in 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 inner side. The inner resin absorption layer 5 is pushed from the inner side by the polyethylene film layer 7 and expands by expanding the diameter so that the overlap portion 27 becomes shorter. The outer resin absorption layer 3 is pressed from the inner side by the inner resin absorption layer 5 whose diameter is expanded, is expanded in diameter and pressed against the inner surface of the sewer pipe 37, and the entire underground pipe repair material 1 is pressed against the inner surface of the sewer pipe 37. .
[0021]
When the underground pipe repair material 1 is pressed against the inner surface of the sewage pipe 37, the 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 heat the underground pipe repair material 1. The curable resin is cured to form the lining layer 43 on the inner surface of the sewer pipe 37.
[0022]
FIG. 6 is a diagram for explaining a stress state when a crushing force acts on the lining layer 43 formed on the inner surface of the sewer pipe 37.
[0023]
Here, when, for example, a downward crushing force (see arrow A) acts on the sewer pipe 37, in the upper portion of the underground pipe repair material 1 or the lining layer 43, a compressive stress (arrow) is formed along the radial cross section on the outer peripheral surface side. B)), but 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 underground pipe repair material 1 or If the tensile strength on the inner peripheral surface side of the lining layer 43 is increased, the underground pipe repair material 1 or the lining layer 43 has a high resistance to the crushing force. In the underground pipe repair material 1 or the lining layer 43, the outer resin absorption layer 3 has a thickness of 5.5 mm or more, and the inner resin absorption layer 5 has a thickness of 1.0 mm or more. Since the glass roving cloth layer 25 is formed thinner than the layer 3, the glass roving cloth layer 25 is disposed on the inner peripheral surface side of the underground pipe repair material 1 or the lining layer 43 and is higher than the vertical glass roving 33 of the glass roving cloth layer 25. Not only the tensile strength is ensured, but also high crushing strength is ensured by the horizontal glass roving 35.
[0024]
By the way, when a downward crushing force (see arrow A) is applied to the sewer pipe 37, the compressive stress (arrow) is formed along the radial cross section on the inner peripheral surface side at the left and right side portions of the underground pipe repair material 1 or the lining layer 43. B ′) occurs, but tensile stress (see arrow C ′) is generated along the radial cross section on the outer peripheral surface side. Therefore, even if the glass roving cloth layer 25 is arranged not on the inner peripheral surface side of the underground pipe repair material 1 or the lining layer 43 but on the outer peripheral surface side, the underground pipe repair material 1 or the lining layer 43 is not subjected to crushing force. It will have a high resistance. In order to secure a higher resistance to the crushing force, the glass roving cloth layer 25 is disposed 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]
【The invention's effect】
As described above, the underground pipe repair material of the present invention includes a glass roving cloth and has sufficient tensile strength and crushing strength. It can be pressed against the inner surface of the middle tube.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an underground pipe repair material according to the present invention.
FIG. 2 is a view 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 view showing a state in which an underground pipe repair material is drawn into the sewer pipe in order to repair the sewer pipe.
FIG. 5 is a view showing a lining layer formed on the inner surface of a sewer pipe.
FIG. 6 is a diagram for explaining a stress state 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 ring layer)
5A Sheet material for inner layer (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-like glass roving cloth 27 Overlap parts 29, 31 Both ends 37 in the width direction of the inner layer sheet material Sewer pipe (underground pipe)
43 Lining layer

Claims (5)

A tubular underground pipe repair material impregnated with a curable resin, which is pressed against the inner surface of the underground pipe by fluid pressure applied to the inside and forms a lining layer for repair on the inner surface of the underground pipe,
An inner resin-absorbing annular layer formed by overlapping both ends in the width direction of the resin-absorbing sheet provided with a glass roving cloth;
And an outer resin absorbent annular layer disposed outside the inner resin absorbent annular layer to accommodate the resin absorbent annular layer of the inner,
The inner resin-absorbing annular layer is formed by using the resin-absorbing sheet as an annular body so that the glass roving cloth is on the outer side, and is formed thinner than the outer resin-absorbing annular layer . Underground pipe repair material. The underground pipe repair material according to claim 1, wherein the outer resin-absorbing annular layer has a thickness of 5.5 mm or more, and the inner resin-absorbing annular layer has a thickness of 1.0 mm or more. The underground pipe repair material according to claim 1, wherein a glass mat layer is provided on the outer peripheral surface side of the inner resin-absorbing annular layer . The underground pipe repair material according to claim 1, 2 or 3, wherein a cylindrical pressurized fluid impermeable film layer is provided inside the inner resin-absorbing annular layer .   The underground pipe repair material according to claim 1, 2, 3, or 4, wherein a tubular impermeable film layer is provided on the outermost side.

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