JPH02108792A - Removing method for underground continuous wall - Google Patents

Abstract

PURPOSE:To high-efficiently and safely remove an underground continuous wall by a method wherein a pipe being not fast is previously embedded in a wall along a division crush projected line and after the wall is built and the temporary use thereof is finished, a static crushing agent is placed in the pipe to destroy the wall. CONSTITUTION:A pipe 4 made of chloride polyvinyl, rubber, or sheet, being not fast is mounted in an iron reinforcing cage along a division crushing projected line (a) of an underground continuous wall 1. An end part 4a thereof is exposed from the top end of the wall 1 and the wall surface side thereof to insert a plug 5. Thereafter, by concreting, a wall is finished, and when a temporary use is finished to remove it, the plug 5 is removed. A static crushing agent is placed in the pipe, by generating a powerful expansion pressure due to hydration reaction, concrete is crushed from the interior. an exposed reinforcing bar is removed, and the wall is conveyed as a large block for removal. This method enables execution of a high-efficient and safe work event at a place having adverse working environment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a construction method for easily removing an underground continuous wall that is no longer needed.

[Conventional technology]

When an underground continuous wall is temporarily used as an earth retaining wall or a water stop wall,
At the final stage of construction, it will be necessary to remove some parts (parts that will no longer be needed after construction is completed).

Generally, this removal work is done little by little using a concrete crusher such as a concrete breaker, and a reinforcing bar and steel cutting machine.

[Problem to be solved by the invention]

However, as the name suggests, underground continuous walls are long and continuous, and are quite strong, so demolishing them requires a lot of effort and time.

Moreover, the underground continuous wall is a vertical structure with some width above and below, and the work environment (scaffolding, etc.) during demolition is poor, and the work is dangerous under water or at high places.

An object of the present invention is to provide a method for removing an underground continuous wall that eliminates the disadvantages of the conventional example and allows the work to be performed easily and quickly.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a pipe that is not robust to a reinforcing bar cage along a planned line for dividing and fracturing an underground continuous wall so that a plug can be formed at the end of the pipe. Install it so that it is exposed at the end of the continuous wall, and follow the usual procedure for underground continuous wall construction to complete the underground continuous wall by pouring concrete.After using the underground continuous wall temporarily, remove the plug and install the pipe. A static or dynamic crushing agent is placed inside to destroy the concrete, cut the exposed reinforcing bars and steel, and divide the diaphragm wall into large blocks.
The purpose of this project is to transport the divided concrete blocks and perform subdivision work as necessary.

[Effect]

According to the present invention, the underground continuous wall can be divided into large blocks, which can be taken out and divided into small pieces at a safe and easy-to-work location.

In addition, dividing the concrete into the large blocks can be done automatically by using a static crushing agent or a dynamic crushing agent without using any equipment, making it a simple task that does not take much time.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

Fig. 1 is a longitudinal side view showing one embodiment of the underground wall removal method of the present invention, and Fig. 2 is a longitudinal front view of the same. It is concrete.

Further, in FIG. 2, the reinforcing bar cage 2 is omitted.

A pipe 4 is installed on the inner side of the reinforcing bar cage 2 assembled on the ground along the planned dividing line a of the underground continuous wall 1.
Install.

This pipe 4 is made of a material that is not very strong, such as vinyl chloride, rubber, or paper, and may be bent at right angles in the middle as shown in Figure 2, but its end 4a is at the top of the underground wall l. Position it so that it stands out on the wall side. Further, the end portion 4a has a structure such that a plug 5 can be fitted therein.

In this way, the reinforcing bar basket 2 with the pipe 4 attached thereto is inserted into the excavated groove. Note that water may be injected into the pipe 4 and the plug 5 may be fitted in order to prevent the influence of buoyancy and water pressure.

Next, concrete 3 is placed according to the usual procedure for continuous wall construction, and the underground continuous wall 1 is completed.

When the temporary use of this underground continuous wall l is completed and it becomes necessary to remove it, the plug 5 is removed and the water in the pipe 4 is drained.

A static crushing agent is injected into this pipe 4 from the end 4a. Examples of the static crushing agent include S-Mite (Sumitomo Cement Co., Ltd.), Denka Chemiax (Denki Kagaku Kogyo Co., Ltd.), and Calmite (Nippon Cement), which are mainly composed of lime-based inorganic compounds. Co., Ltd., Nihon Yugiken Kogyo (
The capsule type is soaked in water and absorbed, and the bulk type is kneaded with water before being inserted or poured into the pipe 4.

The static crushing agent generates a strong expansion pressure due to a hydration reaction with water, and destroys the concrete 3 from the inside together with the pipe 4 or by expanding the pipe 4.

In addition, as another embodiment, instead of the static crushing agent, a dynamic crushing material for mechanically crushing, such as a hydraulic tube, may be inserted into the pipe 4 to perform crushing.

Once the concrete 3 has been destroyed along the planned dividing and crushing line a, the exposed reinforcing bars 2 and steel materials are cut and the wall is divided into large blocks. The divided concrete blocks are then carried out and divided into smaller pieces as necessary.

〔Effect of the invention〕

As described above, the diaphragm wall removal method of the present invention can be used in places where the working environment is extremely bad, such as underwater, and when it is necessary to remove a diaphragm wall, concrete crushing, which accounts for the most weight, can be used. work efficiently and safely,
It is noiseless, vibrationless, and unattended.

[Brief explanation of the drawing]

FIG. 1 is a vertical side view showing one embodiment of the diaphragm wall removal method of the present invention, and FIG. 2 is a vertical front view of the same. 1... Underground continuous wall 2... Rebar cage 3... Concrete 4... Pipe 4a... End 5... Plug

Claims (1)

[Scope of Claims] A non-robust pipe is attached to a reinforcing bar cage along a planned line for dividing and fracturing an underground continuous wall so that a plug is formed at the end of the pipe and the pipe is exposed at the end of the underground continuous wall, Following the normal procedure for underground continuous wall construction, concrete is poured to complete the underground continuous wall, and after the temporary use of the underground continuous wall, the plug is removed and a static crushing agent or dynamic crushing agent is added inside the pipe. to destroy the concrete,
This underground wall removal method is characterized by cutting the exposed reinforcing bars and steel materials, dividing the underground wall into large blocks, and transporting the divided concrete blocks to perform subdivision work as necessary.