JPH0852801A - Method for regenerating existing sewage pipe and regenerated sewage pipe - Google Patents

Abstract

PURPOSE:To provide a regenerating method for an existing sewage pipe and regenerated sewage pipe wherein shortening of execution period and reduction of the construction cost can be achieved, and there is no fear causing breakage of the existing pipe and its weakening. CONSTITUTION:A diameter of an elastically deformable regenerating material 2 is reduced with a jig for reducing the diameter, which is inserted at a specific position in an existing sewage pipe 1 under a state wherein the diameter is reduced. The reduction of the diameter of the regenerating material 2 with the jig for reducing diameter is released, and the diameter is expanded in the existing pipe duct 1 with elastic force of the material 2 itself. Further, the regenerating material 2 is fixed by pressure contact onto an inner peripheral surface 1a of the sewage pipe 1, and the inner peripheral surface 1a of the pipe 1 is coated with the regenerating material 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rehabilitating an existing conduit for rehabilitating an existing conduit such as a water pipe or a sewer pipe, and a rehabilitating conduit rehabilitated by this method.

[0002]

2. Description of the Related Art Generally, fume pipes, ceramic pipes, cast iron pipes and the like have been widely used as pipes such as water pipes and sewer pipes buried in the ground. The inner peripheral surface of these pipes is eroded by hydrogen sulfide and other corrosive gases and deposits and running water in the pipes, and deteriorates due to long-term use, and the pipe thickness becomes thin and the strength decreases. . Also, due to ground pressure or ground subsidence, seams between pipes may be displaced to create gaps, and due to overloading, part of the pipes may be deformed or cracked, and groundwater, etc. may enter the pipes from this part. However, the running water flowing in the pipe may leak into the ground.

As a countermeasure, for example, Japanese Patent Laid-Open No. 3-265
As disclosed in Japanese Unexamined Patent Publication No. 798, in a state in which a diameter-expandable tubular shape is wound in a water-impermeable and elastically deformable sleeve having an outer diameter smaller than an inner diameter of an existing pipe such as a sewer pipe. The sleeve having the disposed base is carried into a predetermined location in the pipe, where the base is spread by an expanding machine and the base is expanded by the fixing means to keep the sleeve in the pipe inner circumference. There is a method of rehabilitating an existing pipe that presses against the surface and forms a water impermeable film on the inner peripheral surface of the pipe.

As another measure, a thermosetting resin rehabilitation pipe is inserted in a collapsed state in a collapsed state into an existing pipe ditch buried in the ground, and high pressure fluid such as pressurized running water is used. A method for rehabilitating existing pipes has been developed and is being implemented, in which the pipe for rehabilitation is expanded by injection and pressed against the inner peripheral surface of the pipe to stretch it, and the pipe for rehabilitation is cured by heating.

[0005]

According to the method of rehabilitating existing pipes, the inner peripheral surface of the existing pipes is covered with a water impermeable sleeve or a thermosetting resin rehabilitation pipe. Even if there is a cracked pipe or an existing pipe with a gap in the seam, intrusion of groundwater etc. into the pipe and leakage of water from the pipe are prevented, and the strength of the existing pipe is improved. can get. However, since it requires equipment such as an expander for expanding the diameter of the covering and a pressurized fluid supply device for expanding the diameter of the rehabilitation pipe, and the expansion work requires a lot of time. It will increase the equipment cost and construction cost of the expansion machine and the pressurized fluid supply device, etc. for a long period of time, and when pressing the sleeve or expanding the diameter of the rehabilitating pipe with the expansion machine and the pressurized fluid supply device, excessive pressing will occur. There is a problem in that the pressure affects the inner peripheral surface of the pipe, and a crack is newly generated in the pipe, which may cause damage or weakening of the pipe.

Therefore, an object of the present invention is to provide a method for rehabilitating an existing drainage pipe and a rehabilitating drainage pipe which can shorten the construction period and reduce the construction cost, and do not induce damage or weakening of the existing drainage pipe. To do.

[0007]

[Means for Solving the Problems] In order to achieve the above-mentioned object, a method for rehabilitating an existing pipe ditch according to the present invention is a method for reconstructing an elastically deformable rehabilitating material in an existing pipe ditch with a diameter reducing jig. , The diameter of the rehabilitated material is released by the jig for diameter reduction, the rehabilitated material is expanded in the existing pipe by the elastic force of itself, and the rehabilitated material is pressed against the inner peripheral surface of the existing pipe. It is characterized in that the inner peripheral surface of the existing conduit is fixed with a rehabilitation material, and the rehabilitation conduit according to the present invention is an existing conduit.
Releasing the elastically deformable rehabilitation material that expands the diameter in the existing pipe by releasing the diameter reduction and then press-contacts the inner peripheral surface of the existing pipe to fix the inner peripheral surface of the existing pipe. It is characterized by having.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an existing pipe rehabilitation method and a rehabilitation pipe according to the present invention will be described below with reference to FIGS.

FIG. 1 is an explanatory cross-sectional view of a main part showing an outline of a method for rehabilitating an existing pipe in the present embodiment.
Is an existing pipe ditch that is made of, for example, a fume pipe, a porcelain pipe, a cast iron pipe, etc., which is buried in the ground and requires rehabilitation.

The existing pipe 1 is deteriorated in strength due to erosion of the inner peripheral surface 1a by hydrogen sulfide or other corrosive gas, running water flowing in the pipe 1 or the like due to long-term use.
In addition, there is a case where part of the material is deformed or cracked due to ground pressure, ground subsidence, top loading, or the like.

In the rehabilitation work of the existing conduit, the inner peripheral surface 1a of the conduit 1 is first cleaned by so-called high-speed cleaning in which high-pressure water is sprayed on the inner peripheral surface 1a of the conduit 1 to be rehabilitated. Correspondingly, surface treatment is performed by a surface treatment machine to remove stains on the inner peripheral surface 1a which cannot be completely removed by high-pressure washing, adhering mortar, mixed roots and the like.

On the other hand, as shown in the perspective view of FIG. 2, the rehabilitation material 2 covering the inner peripheral surface 1a of the pipe 1 is a cylindrical base portion 3a made of an elastically deformable material, for example, spring steel. And a base 3 having a plurality of rows provided along both sides of the base portion 3a, and elastic pieces 3b radially bent so as to be displaced outward as it moves to the tip, and the outer periphery of the base portion 3a of the base 3. And a thin film-shaped annular member 4 for covering.

The annular member 4 is composed of an end-side annular member 4a for covering both ends of the base portion 3a and a central annular member 4b for covering a portion of the base 3a located between the end-side annular members 4a. The end-side annular member 4a is made of a water-swelling material, for example, a water-absorbent resin such as an ether-based polyurethane elastomer or an isobutylene-maleic anhydride copolymer, while the central annular member 4b is made of a glass fiber mat or a glass fiber. A base material such as a nonwoven fabric or a polyester nonwoven fabric is impregnated with a room temperature curable resin such as an unsaturated polyester resin or an epoxy resin.

The tubular rehabilitating material 2 thus constructed is
In the uncured state of the room temperature curable resin forming the central annular member 4b of the annular member 4, as shown in FIG. Then, by a diameter reducing jig 5 having pulling metal fittings 5a that radially extend at six points, the regenerating material 2 is strained in the direction of the central axis a and elastically deformed into a substantially star-shaped cross section to reduce the diameter and reduce the diameter. In this state, the pipe 1 is inserted into a predetermined position to be rehabilitated.

After inserting the rehabilitating material 2 to a predetermined position in the pipe 1, the tension on the rehabilitating material 2 by the diameter-reducing jig 5 is released. The base 3 of the rehabilitating material 2 whose diameter has been released by the diameter reducing jig 5 is restored to a cylindrical shape by the elastic force of its own and expands to cover the inner peripheral surface 1a of the pipe 1.

As shown in FIG. 3 which is a sectional view taken along the line AA of FIGS. 1 (c) and 1 (c), the tip 3b 'of the elastic piece 3b is made into the pipe 1 by restoring the diameter of the base 3 of the rehabilitation material 2. The inner peripheral surface 1a of the pipe 1 is pressed by the inner peripheral surface 1a of the pipe 1 and is slightly deformed to move the base 3
The end side annular member 4a made of a water-swellable material which is held at a and covers the outer peripheral surface of the base portion 3a and the central annular member 4b containing a room temperature curable resin are the base 3 of the rehabilitation material 2 and the pipe. The base 3 of the rehabilitation material 2 is interposed between the inner peripheral surface 1a of
And the inner peripheral surface 1a of the pipe 1 are complemented with each other by closely fitting and fixing them to each other, and the room temperature curable resin forming the central annular member 4 is gradually cured so that the existing pipe 1 is Rehabilitation material 2
Rehabilitated by.

In the above-described embodiment, the regenerator material 2 is elastically deformed into a substantially star-shaped cross-section by the diameter-reducing jig 5 to reduce the diameter of the room-temperature curable resin constituting the central annular member 4b in an uncured state. However, the rehabilitation material 2 which does not contain the room temperature curable resin is elastically deformed into a star-shaped cross-section by a jig 5 for reducing the diameter in advance in a factory or the like to prepare the diameter-reduced state, and immediately before being inserted into the pipe 1 at room temperature. By forming the central annular member 4b by impregnating it with a curable resin, it is possible to improve work efficiency.

It is also possible to use a thermosetting resin in place of the room temperature curable resin which constitutes the central annular member 4b. In this case, after the rehabilitation material 2 is placed in the pipe 1, heating is performed. The thermosetting resin is heated and hardened by the apparatus to form the central annular member 4b. It is also possible to use a thermoplastic resin.

In the above description, the base 3 is formed of spring steel, but the base 3 is not limited to spring steel, and may be formed of other elastically deformable metal or other material such as synthetic resin. Although the rehabilitation material 2 was elastically deformed into a substantially star-shaped cross section to reduce its diameter, the rehabilitation material 2 was elastically deformed into a substantially U-shaped to C-shaped cross-section, for example, as shown in the cross-sectional view of the main part of FIG. It is also possible to reduce the diameter by elastically deforming it into an appropriate shape such as holding it by an annular diameter reducing jig 6.

Next, another embodiment of the method for rehabilitating an existing sewer and the rehabilitate sewer according to the present invention will be described with reference to FIGS.

FIG. 5 is a sectional view of an essential part showing an outline of a method for rehabilitating an existing pipe in the present embodiment. Reference numeral 1 in the drawing is
Similar to the above-mentioned embodiment, it is an existing conduit that requires rehabilitation.

In the rehabilitation work, first, the inner peripheral surface 1a of the pipe 1 to be rehabilitated is cleaned, and the inner peripheral surface 1a is surface-treated by a surface treatment machine as required.

On the other hand, the rehabilitation material 8 for covering the inner peripheral surface 1a of the pipe 1 has a base 9 made of an elastically deformable material, for example, spring steel, as shown in the perspective view of FIG.
Has an elongated sheet-shaped base portion 9a, as shown in a developed perspective view of FIG. A plurality of elastic pieces 9b bent outward are provided on both side edges of the base portion 9a, and when one end portion 9c is inside the other end portion 9d, that is, when the elastic piece is wound in a spiral shape, 9b are arranged radially so as to be displaced outward as they move to the tip.

Further, as shown in FIG. 7, the base portion 9a is provided with an annular member 10 for annularly covering the base portion 9a when the base 9 is wound in a tubular shape. Annular member 10
Is an end annular member 10a for covering both ends of the base 9a.
And a central annular member 10b for covering a portion located between both end annular members 10a, the end annular member 10a is made of a water swelling material, and the central annular member 10b is a glass fiber mat or the like. The base material is impregnated with a room temperature curable resin.

As shown in FIG. 7, one end portion 9c of the base 9 is inside the other end portion 9d of the rehabilitation material 8 formed in a substantially flat plate shape as shown in FIG. So that the diameter of the base 9 is reduced by winding it in a tubular shape against the elastic force of the base 9, and a diameter reducing jig (not shown), for example, an annular jig, is maintained so that the reduced diameter state is maintained. After the rehabilitation material 2 is inserted to a predetermined position in the pipe 1 in the state of being fitted and reduced in diameter, the diameter of the rehabilitation material 8 is reduced by a diameter reduction jig. To release.

The retreading material 8 whose diameter has been released by the diameter reducing jig is expanded by the elastic force of the base 3 itself. By expanding the diameter of the rehabilitating material 8, FIG. 5 (c) and FIG.
The tip 9 of the elastic piece 9a as shown in the section BB of FIG.
a'is pressed by the inner peripheral surface 1a of the pipe 1 to be slightly deformed to hold the base 9 on the inner peripheral surface 1a of the pipe 1 and to attach the outer peripheral surface of the base 9a to the end side annular shape The member 10a and the central annular member 10b are interposed between the base portion 9a of the rehabilitation material 8 and the inner peripheral surface 1a of the pipe 1 to complement the dimensional and shape errors between the rehabilitation material 8 and the base 3. The room temperature curable resin forming the central annular member 10b is gradually cured and the existing pipe 1 is rehabilitated by the rehabilitation material 8.

In the above-mentioned embodiment, the cold-setting resin constituting the central annular member 10b is elastically deformed and reduced in diameter under the uncured state, but the cold-setting resin 8 which does not have the cold-setting resin is used. It is prepared by winding it in a factory or the like in advance and holding it in a reduced diameter state with a diameter reducing jig, and impregnating it with a room temperature curable resin immediately before inserting it into the pipe 1 and encircling the central annular member 10b.
It is also possible to improve the work efficiency by forming the.

Further, instead of the room temperature curable resin forming the central annular member 10b, a thermosetting resin or a thermoplastic resin can be used as in the above embodiment, and the base 9
The material is not limited to spring steel, and may be appropriately formed of other elastically deformable metal or other material such as synthetic resin.

Further, in each of the above-mentioned embodiments, the rehabilitation material 2 or 8 is stretched on the inner peripheral surface 1a of the pipe 1 only by the elastic force of the base 3 or 9, but the rehabilitation material may be additionally supplemented by a spreader or the like. It is also possible to further improve the adhesion between the pipe 1 and the rehabilitation material 2 or 8 by pressing 2 or 8 against the inner peripheral surface 1a of the pipe 1.

According to the existing pipe rehabilitation method and rehabilitation pipe in each of the embodiments described above, the base of the rehabilitation material is formed of an elastically deformable material and is held in a reduced diameter state by the diameter reduction jig. The rehabilitated material is inserted into a predetermined position in the existing pipe, and the diameter reduction by the diameter reducing jig is released, so that the elastic force of the base itself expands the regenerated material and pushes it on the inner surface of the pipe. Since they come into contact and stick to each other, it is possible to abolish equipment such as an expander for expanding the diameter of the rehabilitated material and expansion work,
The construction period and construction cost can be shortened, and the damage and weakening of the existing pipe due to the excessive pressing force by the expansion machine can be avoided. In addition, since the rehabilitation material is fixed in the pipe through the elastic piece formed on the side edge of the base, the elastic piece follows the deformation even if the connection part of the pipe is displaced due to earth pressure or the like. Then, it becomes possible to fix the rehabilitation material in a stable manner in the conduit, and the stable end state is maintained for a long time in combination with the end annular member of the annular member being composed of the water swelling material. This has the effect that the inner peripheral surface of the pipe is reinforced by the rehabilitation material.

[0031]

EFFECTS OF THE INVENTION According to the above-described existing pipe rehabilitation method and rehabilitation pipe of the present invention, the rehabilitation material held in the diameter-reduced state by the diameter-reducing jig is inserted at a predetermined position in the existing pipe. Then
By releasing the diameter reduction by the diameter reduction jig, the elastic force of the rehabilitation material itself expands the diameter of the rehabilitation material and fixes the inner peripheral surface of the pipe to the inner surface of the pipe and the inner peripheral surface of the pipe. Equipment for expanding the material and troublesome expanding work can be abolished, shortening the construction period and reducing construction costs, and damaging the existing pipe due to excessive pressing force associated with the diameter expansion work. In addition, it has effects peculiar to the present invention such as weakening can be avoided.

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view of a main part showing an outline of an embodiment of a method for rehabilitating an existing pipe according to the present invention.

FIG. 2 is a main part perspective view showing an outline of a rehabilitation material used in this embodiment.

3 is a cross-sectional view taken along the line AA in FIG.

FIG. 4 is a cross-sectional view of an essential part showing an outline of another rehabilitation material used in this example.

FIG. 5 is an explanatory cross-sectional view of essential parts showing the outline of another embodiment of the method for rehabilitating an existing pipe according to the present invention.

FIG. 6 is a developed perspective view illustrating the outline of a rehabilitation material used in this embodiment.

FIG. 7 is a perspective view of relevant parts for explaining the outline of a rehabilitation material used in this embodiment.

8 is a sectional view taken along line BB in FIG.

[Explanation of symbols]

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Claims (8)

[Claims] 1. An elastically deformable rehabilitating material is inserted into an existing pipe under the condition that the rehabilitating material is reduced in diameter by a diameter-reducing jig, and the reconstant material is released by the diameter-reducing jig. The inner peripheral surface of the existing pipe is covered with the retread material by expanding the diameter in the existing pipe by the elastic force of itself and fixing the retread material to the inner peripheral surface of the existing pipe by pressing. Rehabilitation method for existing pipes. 2. The method for rehabilitating an existing pipe according to claim 1, wherein the rehabilitation material has a cylindrical shape, and the diameter of the rehabilitation material is reduced by elastic deformation of the rehabilitation material by a diameter reducing jig. 3. The method for rehabilitating an existing pipe according to claim 2, wherein the rehabilitation material is elastically deformed into a substantially star-shaped cross section to be reduced in diameter. 4. The method of rehabilitating an existing pipe according to claim 1, wherein the rehabilitating material is in the form of an elastically deformable sheet wound in a tubular shape capable of expanding its diameter. 5. The rehabilitation material is provided with a plurality of rows along both side edges thereof, and has an elastic piece which is bent outward and is pressed against the inner peripheral surface of the existing pipe. The method for rehabilitating an existing pipe described in any one of the above. 6. The rehabilitation material has an elastically deformable base and an annular member interposed between the base and the inner peripheral surface of the existing pipe ditch, according to any one of claims 1 to 5. Rehabilitation method for existing pipes. 7. The existing pipe culvert and the inner peripheral face of the existing pipe culvert are expanded in the existing pipe culvert by elastic force of the existing pipe cullet by releasing the reduced diameter, and fixed by pressure contact with the inner peripheral surface of the existing pipe culvert. An elastically deformable rehabilitating material covering the rehabilitating pipe. 8. A plurality of rows are provided along both edges of the rehabilitation material,
The rehabilitating pipe according to claim 7, further comprising an elastic piece that is bent outward and is pressed against the inner peripheral surface of the existing pipe.