JPH1054495A - Pipeline repairing and reclaiming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a corrosion resistant inner peripheral surface by a sheet- shaped member by reinforcing the pipe wall by a reinforcement cage. SOLUTION: A reinforcement cage 13 is installed on the inner peripheral side of a concrete-made pipeline 11, a cylindrical net-shaped member 15 in which many communication holes are formed is installed on the inner peripheral side of the reinforcement cage 13, a cylindrical and flexible sheet-shaped member 3 in which many protrusions wider than the communication holes are fixed on the outer peripheral side is inserted into the inner peripheral side of the net-shaped member 15, and cement substance components 9 are poured and solidified on the outer peripheral side of the sheetshaped member 3 in a state where the sheet-shaped member 3 is expanded by filling pressurized liquid 7 on the inner peripheral side of the sheet-shaped member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing and rehabilitating a pipe made of concrete, which forms a corrosion-resistant inner peripheral surface and reinforces a pipe wall.

[0002]

2. Description of the Related Art Conventionally, in repairing concrete pipelines laid underground such as sewer pipes, for example, as shown in FIG. 7, a number of projections (anchors) are fixedly provided on the outer peripheral side. The flexible sheet-like member 3 having a tubular shape is inserted into the inner peripheral side of the conduit 1 and the inner peripheral side of the sheet-like member 3 is filled with a pressurized liquid 7 such as water to expand the sheet-like member 3. In this state, the cementitious substance composition 9 is injected into the outer peripheral side of the sheet-like member 3 and solidified, and the projections on the outer peripheral side of the sheet-like member 3 are embedded in the cementitious substance composition 9. 3, the sheet-shaped member 3 forms a corrosion-resistant inner peripheral surface.

[0003]

According to the above-mentioned construction method, cracks and the like in the pipeline 1 can be blocked by the cementitious substance composition 9 injected into the outer peripheral side of the sheet-like member 3, but it is laid on the ground. In repairing or rehabilitating a concrete pipe line made in some cases, reinforcement of the pipe wall may be necessary, and there has been a problem that the above-mentioned sheet-like member 3 and cementitious substance composition 9 alone do not provide sufficient reinforcement. .

The present invention has been made in view of such a conventional problem,
An object of the present invention is to provide a pipe repair and rehabilitation method for forming a corrosion-resistant inner peripheral surface and reinforcing a pipe wall.

[0005]

SUMMARY OF THE INVENTION The features of the present invention for solving the conventional problems as described above and achieving the intended purpose are as follows.
A reinforcing rod cage is installed on the inner peripheral side of the concrete pipe, and a cylindrical net-like member having a large number of communication holes is installed on the inner peripheral side of the reinforcing rod cage. A cylindrical flexible sheet-like member having a large number of projections wider than the communication hole and fixed to the outer peripheral side is inserted into the inner peripheral side of the sheet-like member. In a state where the sheet-like member is expanded by filling with a pressurized liquid, a cementitious substance composition is injected into the outer peripheral side of the sheet-like member and solidified.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.
Referring to FIG.

In the drawing, reference numeral 11 denotes a cylindrical pipe made of concrete, 3 denotes a cylindrical sheet-like member which forms a mold and also forms a corrosion-resistant inner peripheral surface, and 13 denotes a cylindrical pipe which reinforces a pipe wall. Reference numeral 15 denotes a cylindrical net-like member interposed between the sheet-like member 3 and the reinforcing bar 13 to facilitate the work of inserting the sheet-like member 3.

The sheet-like member 3 is formed of a synthetic resin material such as high-density polyethylene so as to be easily inserted. Further, as shown in FIGS. A large number of projections (anchors) 5, 5,... Are fixed on the outer peripheral surface of the tubular sheet body 4 in a staggered arrangement, and the projections 5 are formed in an umbrella shape having a tip portion wider than a root portion. ing.

Further, as shown in FIG. 4, the net-like member 15 is formed of a synthetic resin material, a metal material or the like so as to have a greater rigidity than the sheet-like member 3 and to maintain a cylindrical shape. A large number of communication holes 1 are formed in the net-like member 15 so that the cementitious material composition 9 such as mortar can pass therethrough.
6, 16 ... are penetrated to the front and back and opened, and the communication hole 16 is
The protrusion 5 of the sheet-like member 3 is formed narrower than the tip of the protrusion 5 so as not to be caught.

In order to repair and rehabilitate the pipeline 11 with the sheet-like member 3, the reinforcing bar 13 and the net-like member 15, etc., first, the deteriorated portion of the inner peripheral surface of the pipeline 11 is crushed and removed. As shown in FIG.
3 is installed at a predetermined position via a spacer or the like, and further, a net-like member 15 is installed on the inner peripheral side of the reinforcing bar cage 13.

Then, as shown in FIG. 2, the sheet-like member 3 is fed from one side of the conduit 11 and pulled from the other side while being folded, so that the net-like member 15
Insert on the inner circumference side. That is, since the net-like member 15 is interposed between the reinforcing bar 13 and the sheet-like member 3, and the communication holes 16, 16, ... of the net-like member 15 are narrow,
The sheet-shaped member 3 is smoothly inserted without a large number of protrusions 5 on the outer peripheral side being caught by the reinforcing bars of the reinforcing bar cage or the communication holes 16 of the net-shaped member 15.

Next, as shown in FIG.
Is filled with a pressurized liquid 7 such as water on the inner peripheral side of the sheet-like member 3.
Are swelled into a cylindrical shape, and in this state, a cementitious substance composition 9 such as mortar is injected into the outer peripheral side of the sheet-like member 3, and the reinforcing bar 13 and the projections 5, 5. Embed in composition 9. After the cementitious substance composition 9 is solidified, the pressurized liquid 7 is discharged.

In this way, the sheet-like member 3 is
The sheet-like member 3 is held in a cylindrical shape through
Can be used as a mold for easy installation, and the sheet-like member 3 can be made to communicate with the cementitious substance composition 9 through the connection holes 16, 16... Of the net-like member 15.
Therefore, the reinforcing of the pipe wall by the reinforcing bar 13 and the formation of the corrosion-resistant inner peripheral surface by the sheet-like member 3 can be efficiently performed.

[0014]

As described above, the pipe line repair and rehabilitation method according to the present invention provides a method in which a steel cage for reinforcing a pipe wall and a sheet-like member forming a mold and forming a corrosion-resistant inner peripheral surface are provided. To
By interposing a net-like member having a large number of communication holes and making the communication hole of the net-like member narrower than the projection of the sheet-like member, the sheet-like member can be easily inserted. In addition, the reinforcing bar and the projections of the sheet-like member can be suitably embedded in the cementitious substance composition, and the formation of the corrosion-resistant inner peripheral surface and the reinforcement of the pipe wall can be efficiently performed.

[Brief description of the drawings]

FIG. 1 is an embodiment of a pipeline repair and rehabilitation method according to the present invention, and is a cross-sectional view showing a first step.

FIG. 2 is a cross-sectional view showing a second step in the embodiment of the pipeline repair and rehabilitation method according to the present invention.

FIG. 3 is a cross-sectional view showing a third step in the embodiment of the pipeline repair and rehabilitation method according to the present invention.

FIG. 4 is a development view of the net-like member in FIG.

FIG. 5 is a development view of the sheet-like member in FIG. 3;

6 is a sectional view taken along line AA of FIG.

FIG. 7 is a cross-sectional view showing an example of a conventional pipe line repair method.

[Explanation of symbols]

 Reference Signs List 3 sheet-like member 4 sheet main body 5 protrusion (anchor) 7 pressurized liquid (water) 9 cementitious substance composition (mortar) 11 pipeline 13 reinforcing bar 15 net-like member 16 communication hole

Claims (1)

[Claims] 1. A rebar cage is installed on an inner peripheral side of a concrete pipe, and a cylindrical net-like member having a large number of communication holes is installed on an inner peripheral side of the rebar cage. A cylindrical flexible sheet-like member having a large number of projections wider than the communication hole fixed to the outer peripheral side is inserted into the inner peripheral side of the member, and the inner peripheral side of the sheet-like member is inserted into the inner peripheral side of the sheet-like member. In a state where the sheet-like member is inflated by filling with a pressurized gas or a pressurized liquid,
A pipe repair and rehabilitation method for injecting and solidifying a cementitious substance composition on the outer peripheral side of the sheet-like member.