JPH06108448A - Repairing method for tunnel - Google Patents

Abstract

PURPOSE:To improve efficiency in repair works by a method wherein a pipe is inserted from the upstream side of a tunnel and the front end thereof is opened to the outside of a repairing area, and the repairing area is kept in the dry state with upstream water drained after the upstream side is shut off. CONSTITUTION:A bypass pipe 2 is inserted from the entrance side of a tunnel and the front end thereof is opend to the downstream side on the outside of a repairing area. The stream is shut off with a shutting member 3 placed crosswise to the upstream side on the outside of the repairing area. Then, water in the upstream side is let flow to the downstream side through the pipe 2 by operation of a pump or the like, and the repairing area in the tunnel is kept dry. As occasion demands, a shutting member 4 may be provided to the downstream side. Thereby, inspection and repair of the tunnel can be executed without requiring underwater works and at the same time, the works can be executed safely and at low costs, contributing to improvement of reliability in the works.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel repair method.

[0002]

2. Description of the Related Art When a tunnel such as a water and sewerage tunnel is aged, it is desirable to temporarily stop the passage of water and to make it dry so that it can be investigated and repaired. However, it is actually difficult to stop the water supply for a long time, and the sewerage cannot stop the use at home. Due to these circumstances, inspection and repair of aging parts must be carried out while maintaining water flow.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As described above, in the conventional tunnel repair method, the diver dives while passing water to inspect the collapsed portion, but the flow velocity is high. It is dangerous work in a tunnel, and if not, it is difficult to carry out repair work or large-scale work for a long time.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art.
Moreover, it is an object of the present invention to provide a method for repairing a tunnel, which can perform inspection and repair work in a dry state similarly to ground work.

[0005]

In order to achieve the above-mentioned object, the tunnel repair method of the present invention is a tunnel repair method during water passage, in which a tunnel is introduced from the entrance to the tunnel. Insert a hollow pipe with a cross-sectional area smaller than that of the bypass pipe as a bypass pipe, take in water from one end of this bypass pipe, open the other end of the bypass pipe to an extent that does not affect repair, and run the running water in the tunnel. The feature is that the work in the tunnel is performed after switching to the inside of the bypass pipe.

[0006]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of a tunnel repairing method of the present invention will be described below with reference to the drawings. <A> Prerequisites As described above, the target conditions of the repair method of the present invention are:
It is used for repairing a tunnel 2 which is under water and which is in a state where water cannot be stopped for a long period of time.

<B> Bypass Pipe The bypass pipe 1 used in the repairing method of the present invention is made of metal, synthetic resin or other material. If the extension is long, use a material that can connect short pipes one after another by welding, welding, or other methods, but it is also possible to use a long rolled flexible pipe by unwinding. it can. The cross-sectional area of the bypass pipe 1 is smaller than that of the tunnel 2 in use. When water is being passed through the entire cross section of the tunnel 2, the bypass pipe 1 having a cross section smaller than that has an insufficient cross sectional area. In that case, the flow rate per hour is increased by pressurizing the water flowing in the bypass pipe 1 to compensate.

[0008]

[Construction method]

<A> Preparation In the drawings, a case where the upstream side entrance of the tunnel 2 is an open channel will be described. In that case, first, a work base is created around the entrance of the tunnel 2. Then, a pipe having a cross-sectional area smaller than the cross-sectional area of the tunnel 2 described above is transported to the base as the bypass pipe 1 and prepared.

<B> Insertion of bypass pipe 1 (FIG. 1) The bypass pipe 1 is inserted from the entrance side of the tunnel 2. When the length of each pipe is shorter than the length of the tunnel 2, they are sequentially connected by welding, welding or the like to increase the length. If the pipe to be used is sufficiently long, it may be sequentially extended into the tunnel 2 and extended. When the other end of the bypass pipe 1 reaches a range that does not affect the repair, it is opened as it is. Alternatively, a shutoff gate may be installed at the end of the gate to prevent backflow from the open side.

<C> Blocking of water channel After inserting the bypass pipe 1, the blocking member 3 is traversed in the channel to block the flow. At that time, if a sluice is constructed in advance, the waterway can be immediately shut off by lowering the gate board along the longitudinal grooves on both banks. In other cases, it is necessary to construct a gate for blocking, but the work can be completed within a short period of time with minimal influence because the work is only to set the members traversing the waterway.

<D> Switching the water channel (FIG. 2) At the same time as installing the blocking member 3, one end of the pipe is installed in the water on the upstream side, and a pump is installed in the middle. By operating the pump P in this way, water can be taken in from the end of the bypass pipe 1. Further, by installing the pump P, it is possible to increase the flow rate per unit time in the bypass pipe 1 and compensate for the shortage of the switching cross-sectional area. In this way, if the running water in the tunnel 2 is switched to the inside of the bypass pipe 1, the inside of the tunnel 2 will be in a dry state. In this case, if the water level on the downstream side is high, the downstream blocking member 4 may be installed. Therefore, the worker can perform inspection, repair, and inspection work in the tunnel 2 under the same environment as that on the ground.
(Figure 3)

[0012]

Since the tunnel repair method of the present invention is as described above, the inspection and repair can be performed by the same work as a normal outdoor construction without depending on a special diver, which is extremely economical. Target. Further, since the work is not underwater, the work is reliable and highly reliable. Particularly, in the conventional method of working in a tunnel under water, even a diver can not work if it is a rapid stream or muddy water, but if the method of the present invention, such a problem will not be affected at all. It is possible to carry out reliable repair without receiving it.

[Brief description of drawings]

[Figure 1] Illustration of tunnel repair method

[Fig.2] Illustration of tunnel repair method

FIG. 3 is an explanatory diagram of a tunnel repair method.

Claims (1)

[Claims] 1. A method for repairing a tunnel during passage of water, wherein a hollow pipe having a cross-sectional area smaller than the cross-sectional area of the tunnel is inserted from the entrance of the tunnel as a bypass pipe, and one end of the bypass pipe is inserted. A method of repairing a tunnel in which water is taken in, the other end of the bypass pipe is opened to a range that does not affect the repair, and the running water in the tunnel is switched to the inside of the bypass pipe before the work in the tunnel is performed.