JP2002122287A - Rehabilitation method that can improve the performance of buried pipes - Google Patents

Abstract

(57) [Summary] [Purpose] It is not necessary to dig a buried pipe, and the performance of the pipe can be improved. A required number of reinforcing plates made of a stainless steel material having a length shorter than the length of the buried pipe and a length longer than the circumference of the inner wall surface of the buried pipe are transported into the buried pipe through a human hole or the like, thereby reinforcing the board. The plate 12 is bent into a cylindrical shape and pressed against the inner wall surface, and the edges of the reinforcing plate 12 are joined in the tube axis direction to form a reinforcing tube 12 '. An annular body 13 made of an elastic material is attached to the reinforcing tube 12'. The reinforcing plate 12 is arranged at the end in the tube axis direction, and is connected in the tube axis direction at the end in the ring axis direction by a fixing member 14 made of a stainless steel material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving performance and rehabilitating a buried pipe installed in the ground without excavating the pipe.

[0002]

2. Description of the Related Art When a water pipe for agriculture, industry, water supply or sewerage using a precast concrete pipe or other pipe, abbreviated as PC pipe, is damaged, Had to dig up and remove the damaged tube and replace it with a new one.
It is premised that excavation from the ground is possible for such construction, but it is not limited to such places and there are many cases where preparation is necessary even if possible. The excavation and backfilling work itself is very large. Therefore, the amount of work is increased, and the construction cost must be increased. Further, the performance of the pipe after the construction merely returns to the performance of the pipe before being damaged.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to make it possible to complete construction in a short period of time without having to dig a pipe. It is. Another object of the present invention is to provide a method for rehabilitating a buried pipe capable of improving the seismic resistance, corrosion resistance, and the like of the pipe after the completion of the construction.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a reinforcing plate made of a stainless steel material, having a length shorter than a buried pipe and having a dimension equal to or greater than a circumferential length of an inner wall surface of the buried pipe. The required number of pieces are loaded into the buried pipe from a human hole, etc., the reinforcing plate is bent into a cylindrical shape and pressed against the inner wall surface, and the edges of the reinforcing plate are joined in the pipe axis direction to form a reinforcing cylinder, thereby forming an elastic material. By disposing the annular body made of the reinforcing cylinder at the end in the pipe axis direction of the reinforcing cylinder and fixing the annular body to the inner surface of the reinforcing cylinder using a fixing member made of a stainless steel, the adjacent reinforcing cylinders can be flexibly connected to each other. In addition, a means of connecting in a watertight manner is taken.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The method of rehabilitating a buried pipe according to the present invention is for repairing and rehabilitating a buried pipe buried underground without excavating it. Accordingly, the target buried pipe is often a buried pipe such as a so-called PC pipe which has been deteriorated after many months have passed since construction. This type of buried pipe has a pipe channel in which external pressure such as internal water pressure and earth load acts.
Such a pipe channel is also a preferred embodiment of the present invention. In order to repair a buried pipe without excavating it, it is necessary to carry materials and the like necessary for the repair into the pipe.

Therefore, in the present invention, a required number of reinforcing plates having a length shorter than the length of the buried pipe and a dimension equal to or greater than the circumferential length of the inner wall surface of the buried pipe are introduced through a human hole or the like. The reason for making the length shorter than the buried pipe is to make the reinforcing plate a length that can be carried into the pipe. Also, handling within the pipe becomes easy. Buried pipes can be standard or of a fixed length, but not others.
The standard for length is standard. Also, the reason why the dimension is required to be equal to or greater than the circumferential length of the inner wall surface is that when one reinforcing plate is pressed against the inner wall surface, it is desirable that the end portions overlap.

The reason why the reinforcing plate needs to be made of a stainless material is to take into account the installation environment of the buried pipe and the flow of water flowing through the pipe. As a plate made of a stainless steel material, a stainless steel plate is optimal from the viewpoint of high corrosion resistance, good workability, easy availability, and not too high cost. Therefore, when a stainless steel plate is used, the joining method of the reinforcing plate in the pipe axis direction is welding. In addition, plate materials other than stainless steel plates are not inconceivable.For example, resin sheets or composite materials of resin sheets and metal plates can be used. If welding is not suitable for joining these materials, bonding Is the joining means.

[0008] The edge to be joined here is the edge of the inner end of the reinforcing plate which is pressed against the inner wall surface to cause overlap, and the pipe axis direction is substantially equal to the central axis of the buried pipe. Means the direction along. The reinforcing plate is pressed against the inner wall surface of the buried pipe using a jack or the like, and the edges are welded.As a result, the reinforcing cylinder is completed as a tubular structure that can withstand the pressure of the water flow flowing through the buried pipe. . That is, a plurality of reinforcing cylinders are inserted inside the buried pipe.

The reinforcing cylinder is further fixed at an end in the tube axis direction by a fixing member made of a stainless material via an annular body made of an elastic material. That is, the adjacent reinforcing cylinders are arranged so that the ends are abutted with each other, the inside of the abutted adjacent end is covered with an annular body, and further fixed by a fixing member.

[0010] In this manner, the reinforcement of one buried pipe is completed, and the buried pipe is rehabilitated as a pipe having improved properties such as earthquake resistance and corrosion resistance.

For the joint between the buried pipes and the buried pipes, an annular body made of an elastic material and a fixing member made of a stainless steel material can be used. In other words, a large annular body made of an elastic material disposed on both sides of the buried pipe and the joint portion of the buried pipe is fixed by the fixing member made of the stainless steel.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the illustrated embodiments. In each of the figures, reference numeral 10 denotes a buried pipe installed underground, which is formed by adding precast concrete of a fixed length to form a pipeline.
A human hole 11, a so-called manhole, is provided at an appropriate place.
Reference numeral 12 denotes a reinforcing plate made of a stainless steel plate. FIG. 1 shows a reinforcing plate 1 in a rolled state for carrying in.
2, an annular body 13 covering the end 12a in the tube axis direction from the inside, and a fixing member 14 in an exploded state are shown.

The annular body 13 has a size suitable for the target inner diameter of the buried pipe 10, and has seal projections 15 projecting outward at both ends of the outer periphery. The fixing member 14 has strip-shaped fixing pieces 16, 16 divided into two parts,
The screw row 17 is provided at one end of the fixing pieces 16, 16.
And connecting pieces 20, 20 having an elongated hole 19, which are adjustably fastened to one end of the fixing piece 16 by screwing a bolt 18 into one of the internal thread rows 17. At one end of each fixing piece 16, a receiving portion 22 is provided on which the hooking portion 21 of the connecting piece 20 is hooked, and similarly, at the other end of each fixing piece 16, a receiving portion 23 is provided. Have been. The two receiving portions 22 and 23 are means for attaching receiving stands 25 and 25 for supporting the jack 24.
As the technique relating to the mounting of the fixing member 14, a technique disclosed as a device for preventing a water leakage of a liquid transfer pipe disclosed in Japanese Utility Model Publication No. 64-6474 or the like can be applied.

An embodiment of the buried pipe rehabilitation method according to the present invention will be described. In the embodiment, four reinforcing plates are used per standard buried pipe. First, the required number of reinforcing plates 12 are carried into the target buried pipe 10 through the human hole 11 together with the annular body 13, the fixing member 14, various parts, tools, and the like by the operator's hand. The loaded reinforcing plate 12 is bent to a winding diameter matching the inner diameter of the buried pipe 10,
It is pressed against the inner wall surface of the buried pipe 10.

At this time, each of the fixing pieces 16, 16 is
It is in a state of being connected in an annular shape using 5, 25. The ends of the fixing pieces 16, 16 are engaged with the latching portions 21 of the connecting piece 20, and the receiving portions 25 are respectively attached to the receiving portions 22, 23, and the jacks 24 are used between the receiving portions 25, 25. A bolt is screwed into the female thread row 17 of the other fixed piece 16 from the long hole 19 of the connecting piece 20 hooked to the end of one fixed piece 16 by the hook 21 at a predetermined value. 18
It is done by tightening. Jack 24 after bolt fastening
Since the pedestal 25 and the pedestal 25 are removed, a pair of fixing pieces 16, 16 are provided in the buried pipe with the pedestals 25, 25 and the bolts 18, 1.
8 are only left in the fastened state (FIG. 4).
See the solid line illustration in FIG. ).

The thickness of one reinforcing plate 12 is, for example, 2 mm, 3 mm in the overlapping portion of one stainless steel plate having a thickness of 1.5 mm. The thickness of the body 13 is less than 10 mm for a buried pipe diameter of 1200 mm, and the plate thickness of the fixing piece 16 is about 8 mm of a stainless steel plate. Therefore, even if it is double-sized, the amount of protrusion in the pipe is extremely small. In the case of the embodiment using four reinforcing plates 12 as described above for one buried pipe 10, three intermediate contact end portions 12a are joined with fixing members, respectively.
Thereafter, the end edge 12b at the end of winding of each reinforcing plate 12 is welded to form a reinforcing cylinder 12 '.

The reinforcing cylinders 12 'are arranged so as to be in contact with each other from the end of the buried pipe 10, and the annular body 13 is applied to the contact end 12a of each reinforcing cylinder 12'. The annular body 13 is brought into close contact with the adjacent reinforcing cylinders 12 ', 12' by ribs 26, 26 provided at both ends on the outer periphery (see FIG. 4), and the reinforcing cylinder 12 arranged inside the buried pipe by the fixing member 14 arranged inside. 'And is fixed.

The joint 28 between the buried pipe 10 and the adjacent buried pipe 10 has two fixing piece mounting portions 29,
The leak prevention work is performed by using the wide annular body 30 having 29. As shown in FIG. 4, the corresponding portion has two ribs 31 similar to the above on the outer peripheral surfaces of both ends of the wide annular body 30 provided with the fixing piece attaching portions 29, 29. The adjacent buried pipe 10 is
To the reinforcing cylinders 12 '.

As described above, one buried pipe 10 has the same mechanical performance as that of the tubular structure composed of several reinforcing cylinders. In particular, in the present invention, since the annular body 13 functions as a flexible joint, it is not necessary to consider the stress in the pipe axial direction. Since the main purpose is to prevent water leakage of the buried pipe 10, external pressure is given to the buried pipe 10 and only internal pressure is considered. It is possible to use a very thin material, which contributes to cost reduction. In addition, since the surface that comes into contact with the fluid flowing inside is replaced with a stainless steel plate, chemical stability is also improved. Therefore, according to the present invention, not only the buried pipe 10 can be simply reinforced, but also the existing buried pipe 10 can be converted into a pipe body of a higher standard.

[0020]

Since the present invention is constructed and operates as described above, the reinforcing plate can be carried into the buried pipe and all the work can be performed inside the buried pipe. Because there is no impact on local residents, the construction is completed in a short period of time, and it is necessary to consider the pipe axial stress by the function of the annular body as a flexible joint and the function of a reinforcing pipe that only has to bear internal pressure. Since the main purpose is to prevent water leakage, the external pressure only needs to be taken into account by giving the buried pipe the internal pressure.Therefore, it can be made of a very thin material, and the cost can be greatly reduced. In addition, it absorbs the seismic force and temperature change generated in the pipe, improves the earthquake resistance and the corrosion resistance, and has the effect that the pipe can be remodeled to a higher standard.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view for explaining a rehabilitation method capable of improving the performance of a buried pipe according to the present invention.

FIG. 2 is an exploded perspective view for explaining members and the like used in the above method.

FIG. 3 is a cross-sectional view of a buried pipe reinforced by the method of the present invention.

FIG. 4 is an enlarged vertical sectional view of an upper half portion of the buried pipe along the pipe axis direction.

FIG. 5 is a longitudinal sectional view of a buried pipe reinforced by the method of the present invention.

Claims (2)

[Claims] 1. A method for rehabilitating a buried pipe installed in the ground without excavating the buried pipe, having a length shorter than the buried pipe and having a dimension equal to or greater than a circumferential length of an inner wall surface of the buried pipe. The required number of reinforcing plates made of stainless steel are carried into the buried pipe through human holes, etc., and the reinforcing plates are bent into a cylindrical shape and pressed against the inner wall surface, and the edges of the reinforcing plates are joined in the pipe axis direction. Forming a reinforcing cylinder, disposing an annular body made of an elastic material at the end of the reinforcing cylinder in the pipe axis direction, and fixing the annular body to the inner surface of the reinforcing cylinder using a fixing member made of a stainless steel material, A rehabilitation method capable of improving the performance of a buried pipe, characterized in that adjacent reinforcing cylinders are connected flexibly and water-tightly. 2. The rehabilitation method according to claim 1, wherein the reinforcing plate is made of a stainless steel plate, and the means for joining its edges along the pipe axis direction is welding.