JPH0852800A - Regeneration construction method of existing sewer pipe and regenerated pipe culvert - Google Patents

Abstract

PURPOSE:To shorten the execution period and reduce the execution cost while preventing the elution of the material components of an existing sewer pipe and a regeneration pipe to ensure reliability. CONSTITUTION:A steel regeneration pipe 7 having a closed cross-sectional shape folded so as to be expansible in its diameter is inserted in an existing sewer pipe and a high pressure fluid is injected into the regeneration pipe 7 to expand the pipe 7 in the existing sewer pipe 1 to bring the same into close contact with the existing sewer pipe 1 to cover the inner wall surface 1a of the existing sewer pipe 1 with the steel regeneration pipe 7.

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 supply pipe already installed, and a rehabilitating conduit.

[0002]

2. Description of the Related Art Pipes such as water supply mains that are generally buried in the ground and branch pipes that branch from the water supply mains to homes and offices have conventionally been cast iron pipes, asbestos pipes, lead pipes, etc. Is widely used. However, with cast iron pipes, rust and rust lumps may be generated on the inner wall surface after long-term use, and this rust may elute and mix into the running water in the drainage pipe. However, harmful substances to the human body including carcinogens such as asbestos and lead used as the material may be eluted and mixed into the running water in the conduit.

Furthermore, the inner wall surface of these pipes is eroded by running water or the like after a long period of use, and the pipe thickness is reduced and the strength is lowered. Also, due to ground pressure or ground subsidence, the seam between pipes may be displaced to create a gap, or due to overloading, part of the pipe may be deformed or cracked, and groundwater, etc. may enter into the pipe from this part. Inflow and running water flowing through the pipe may leak into the ground.

As a countermeasure against this, 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 injected to rehabilitate the pipe. A method for rehabilitating existing pipes has been developed and implemented, in which the pipes are expanded and pressed against the inner wall surface of the pipe to stretch them, and the rehabilitation pipe is cured by heating.

[0005]

SUMMARY OF THE INVENTION In the above-mentioned method of rehabilitating an existing pipe, the inner wall surface of the existing pipe is covered with a thermosetting resin rehabilitation pipe, so that a pipe of rust, asbestos, lead or the like is used. It is possible to prevent the material from being eluted and mixed into the running water in the pipes, and to prevent water leakage from the gaps between the pipes and cracks. However, it is necessary to expand the diameter of the thermosetting resin rehabilitation pipe in the existing pipe to stretch it and then cure the rehabilitation pipe by heating, which requires a lot of time for the heating work.
The construction period is prolonged and the construction costs such as equipment costs for heating equipment are increased, and scratches etc. occur on the inner wall surface of the rehabilitation pipe when cleaning the pipe pit regularly or as needed after rehabilitation. The smoothness of the inner wall surface is impaired to promote the accumulation of suspension in the pipe, and the flow resistance of the running water is increased, and further, the material components of the rehabilitation pipe may be mixed into the running water.

Therefore, according to the present invention, the construction period and the construction cost can be shortened, and there is no possibility that the material components of the existing pipe and the rehabilitation pipe will be eluted into the running water in the pipe, and the reliability can be secured. It is to provide a method for rehabilitating an existing pipe and a rehabilitation pipe.

[0007]

A method for rehabilitating an existing pipe according to the present invention for achieving the above object has a closed cross-sectional shape in which the diameter is folded so that the diameter can be expanded and the tip is sealed. Insert a metal rehabilitation pipe that does not elute harmful substances into the existing rehabilitation pipe and inject high-pressure fluid into the rehabilitation pipe from the base end of the rehabilitation pipe to expand the rehabilitation pipe within the existing rehabilitation pipe. Characterized by expanding the diameter and plastically deforming so that the outer wall surface of the rehabilitation pipe is pressed against the inner wall surface of the existing pipe to closely fix it, and the inner wall surface of the existing pipe is covered with the rehabilitation pipe. Further, the rehabilitation pipe according to the present invention is plastic in the existing pipe by the injection of high-pressure fluid into the existing pipe and the closed cross-sectional shape of which the diameter is folded so that the diameter can be expanded. Expanded and expanded to the inner wall surface of the existing pipe and press it against the inner wall surface of the existing pipe to elute substantial harmful substances. It is characterized in that it has a free metal rehabilitating pipe.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the existing pipe rehabilitation method and rehabilitation pipe under the present invention will be described below with reference to the drawings in which the pipe to be rehabilitated is a branch pipe branched from a water supply main for water supply. .

FIG. 1 is a cross-sectional view of an essential part showing an outline of a method for rehabilitating an existing pipe in this embodiment, and FIG. 2 is a cross-sectional explanatory view of an essential part showing a laid state of a branch pipe.

In the figure, reference numeral 1 is a branch pipe to be rehabilitated, one end of the branch pipe 1 is connected to a water supply main pipe 2 for water supply, and the other end is arranged, for example, in a domestic basin 3. It is connected to a water supply device 6 of each home or the like through a water shutoff valve 4 and a water meter 5.

The branch pipe 1 is made of, for example, a lead pipe which may substantially elute harmful substances, and the inner wall surface 1a is eroded by running water or the like to deteriorate its strength after long-term use. Cracks due to subsidence, overload, etc.
Further, there is a case where it is curved and deformed as shown by a one-dot chain line 1'in FIG. 2 or as shown in (a) in FIG.

In the rehabilitation work of the branch pipe 1, first, the water shutoff valve 4 and the water meter 5 are removed from the branch pipe 1, and the inner wall surface of the branch pipe 1 is washed by a pipe washing device or the like.

Next, as shown in the cross section of FIG. 1 (b), it is folded into a substantially U-shaped or C-shaped shape that can be expanded, and has a closed cross-sectional shape with a reduced diameter and a substantially cylindrical outer shape. The rehabilitation pipe 7 made of the deformed steel pipe is inserted.

The rehabilitation pipe 7 is sealed at the tip by a tip sealing member (not shown), and has a coupling member at the base end for injecting a high-pressure fluid, for example, water into the rehabilitation pipe 7 under pressure. (Not shown) is provided, and the outer peripheral length of the rehabilitation pipe 7 is set substantially to the inner peripheral length of the branch pipe 1, and along the inner wall surface 1a of the branch pipe 1 without excess or deficiency in the expanded state described later. With a dimension to be stretched, the outer diameter dimension d of the rehabilitation tube 7 is set to about 1/2 of the inner diameter dimension D of the branch tube 1 in the folded and reduced diameter state shown in FIG. 1 (b). There is.

Since the outer diameter d of the rehabilitation pipe 7 is remarkably smaller than the inner diameter D of the branch pipe 1 and is made of mild steel, the branch pipe 1 is pushed into a curved shape or an elliptical sectional shape. Even if it has a crushed shape, the rehabilitation tube 7 is easily curved to follow the curved or deformed inner wall surface 1a of the branch tube 1 to facilitate branching.
Can be inserted into.

Next, at both ends of the branch pipe 1, that is, in the main water supply pipe 2 and the basin 3, the branch pipe 1 in which the front end and the base end of the rehabilitation pipe 7 are projected, respectively.
While being inserted into the rehabilitation pipe 7, a high-pressure fluid is supplied into the rehabilitation pipe 7 by a pressure supply device (not shown) through a coupling member provided at the base end of the rehabilitation pipe 7, for example, water is injected under pressure.

In accordance with the pressurized injection of water, the rehabilitation pipe 7 inserted into the branch pipe 1 is gradually expanded in diameter by fluid pressure and expanded into a circular cross section as shown in FIGS. 1 (c) and 1 (d). Figure 1
As shown in (e), the outer wall surface 7a is plastically deformed so as to be pressed against and closely fixed to the inner wall surface 1a of the branch pipe 1, and the inner wall surface 1a of the branch pipe 1 is covered with the rehabilitation pipe 7. .

As the diameter of the rehabilitation pipe 7 increases or expands, the outer wall surface 7a of the rehabilitation pipe 7 presses against the inner wall surface 1a of the branch pipe 1 so that the curved branch pipe 1 responds as indicated by a chain line 1 '. The portion of the branch pipe 1 which is deformed into a substantially linear shape or an elliptical shape in cross section is also restored to a substantially circular shape in cross section.

Next, the portion of the rehabilitation pipe 7 protruding from one end of the rehabilitation pipe 7 into the main water supply pipe 2 is cut off to open the tip of the rehabilitation pipe 7 to the inner wall surface 1a of the main water supply pipe 1, and The base end is cut off and opened in the basin 3, the water shutoff valve 4 and the water meter 5 are attached, and the water supply device 6 is connected to complete the rehabilitation of the branch pipe 1.

In the above embodiment, the diameter of the rehabilitation pipe 7 was expanded and the outer wall surface 7a was directly fixed to the inner wall surface 1a of the branch pipe 1.
The inner wall surface 1a of the branch pipe 1 and the outer surface of the rehabilitation pipe 7 are provided by interposing a cushioning material, for example, a styrofoam material or a water swelling material, between the outer wall surface 7a of the rehabilitation tube 7 and the inner wall surface 1a of the branch pipe 1. It is also possible to complement the dimensional or shape error with the wall surface 7a to achieve further close contact and fixation. In this case, a cushioning material such as a styrofoam material or a water-swelling material is preliminarily stretched on the outer wall surface 7a of the rehabilitation pipe 7, inserted into the branch pipe 1 and expanded by fluid pressure in the same manner as described above to form the branch pipe 1. It can be efficiently performed by interposing it with the rehabilitation pipe 7.

In the above-mentioned embodiment, an example using the rehabilitation pipe 7 having a closed U-shaped to C-shaped closed cross-section which is folded so as to be able to expand its diameter has been described. Rehabilitation pipe 8 having a closed cross-sectional shape that is folded so that it can be expanded in diameter
It is also possible to use, in which case the outer wall surface 8a of the rehabilitation pipe 8 and the inner wall surface 1a of the branch pipe 1 at the time of expanding the diameter and the sliding contact points are substantially equal to the inner wall surface 1a of the branch pipe 1. The diameter of the branch pipe 1 can be increased more uniformly along the inner wall surface 1a of the branch pipe 1, and the branch pipe 1 can be rehabilitated by a high-quality rehabilitation pipe without local distortion.

Further, the diameter is not limited to the rehabilitation pipe having a closed cross-section whose diameter is reduced to a substantially U-shaped or C-shaped cross section or a substantially S-shaped cross section, and the expanded diameter shown in FIGS. It is also possible to appropriately use a rehabilitation tube 9 having a substantially star-shaped cross-section which is possible or another rehabilitation tube having a closed cross-section having an arbitrary cross-sectional shape capable of expanding the diameter.
Further, in the above embodiment, the case where the branch pipe 1 branched from the water supply main pipe 2 is rehabilitated has been described. However, not only the branch pipe 1 but also the water supply main pipe 2 can be rehabilitated, and other It is also possible to apply it appropriately to the rehabilitation of existing pipes, the material of the rehabilitation tube is not limited to the above mild steel, stainless steel, aluminum and nickel alloys and other suitable metal that does not substantially elute harmful substances It is also possible to use

[0023]

[Effects of the Invention] According to the rehabilitating method for rehabilitating an existing pipe and the rehabilitating pipe of the present invention described above, the closed cross-sectional shape is made of a metal that does not substantially dissolve harmful substances, and is folded so as to be expandable and reduced in diameter. Since the rehabilitation pipe is plastically expanded and expanded by injecting a high-pressure fluid into the existing pipe to cover the inner wall of the existing pipe, the inner wall of the existing pipe is made of the above-mentioned highly reliable metal. It is covered with the rehabilitation pipe of, and the existing pipe material, for example, rust, asbestos, lead, etc. are prevented from being eluted and mixed in the running water in the pipe,
Since the rehabilitation pipe is reinforced from the inside by the metal rehabilitation pipe and has a relatively high strength, it is possible to restore the curvature and cross-sectional shape deformation of the existing pipe conduit according to the diameter expansion due to the supply of high-pressure fluid. Become. Furthermore, the inner wall surface of the existing pipe is covered with a relatively high hardness rehabilitation pipe, and the inner wall surface of the rehabilitation pipe is prevented from being scratched even when cleaning the inside of the pipe to ensure smoothness. Accumulation in the pipes is avoided, high quality rehabilitation pipes can be obtained without increasing flow resistance, and the rehabilitation pipes are hardened compared to conventional rehabilitation pipes using thermosetting resin rehabilitation pipes. The heat-hardening work for making it unnecessary is achieved, and there are effects peculiar to the present invention such that the construction period can be shortened and the construction cost can be reduced.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional explanatory view of a main part for explaining a laid state of a pipe in the present embodiment.

FIG. 3 is a cross-sectional view of an essential part for explaining another rehabilitation pipe used in this embodiment.

FIG. 4 is a cross-sectional view of an essential part for explaining still another rehabilitation pipe used in this embodiment.

[Explanation of symbols]

 1 ‥‥‥‥ Branch pipe (existing pipe) 1a ・ ・ ・ ‥ Inner wall 2 ‥‥‥‥ Water supply main (existing pipe) 7 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ elsewhere.

Claims (6)

[Claims] 1. A metal rehabilitation pipe, which has a closed cross-sectional shape in which it is folded so as to be capable of expanding its diameter and has a reduced diameter, and whose end is sealed and which does not elute substantially harmful substances, is provided in an existing pipe conduit. Insert and
High-pressure fluid is injected into the rehabilitation pipe from the base end of the rehabilitation pipe to expand and expand the diameter of the rehabilitation pipe in the existing pipe, and the outer wall surface of the rehabilitation pipe is pressed against the inner wall of the existing pipe to fix the pipe firmly. A method for rehabilitating existing pipes by plastically deforming them to cover the inner wall surface of the existing pipes with rehabilitation pipes. 2. The folded and reduced cross-sectional shape of the rehabilitation pipe has a substantially U-shaped to C-shaped closed cross-sectional shape.
Rehabilitation method for the existing conduit described in. 3. The method for rehabilitating an existing pipe according to claim 1, wherein the collapsed diameter of the rehabilitation pipe has a substantially S-shaped closed cross-sectional shape. 4. The method for rehabilitating an existing pipe according to claim 1, wherein the rehabilitation pipe is made of mild steel. 5. A cushioning material is interposed between the outer wall surface of the rehabilitation pipe and the inner wall surface of the existing pipe, and they are fixedly attached to each other.
The method for rehabilitating an existing pipe as described in any one of 1 to 4 above. 6. The existing pipe conduit is plastically expanded and expanded in the existing pipe conduit by injecting high-pressure fluid into the existing pipe conduit and the inside having a closed cross-sectional shape that is folded so as to be expandable and has a reduced diameter. A rehabilitating pipe culvert, which comprises a metal rehabilitation pipe that presses against the inner wall surface of the ditch and covers the inner wall surface of the existing pipe without elution of substantially harmful substances.