JPH03183896A - Crushing method of temporary concrete - Google Patents

Abstract

PURPOSE:To make it possible to easily crush a temporary concrete by placing pipes in an area to place concrete in advance, and injecting the pipes with an expansive crushing agent after the temporary concrete is placed so as to enclose the pipes thereby. CONSTITUTION:On the occasion of placing a temporary concrete, pipes such as spiral sheath pipes 16 and 16, etc., are placed in an area to place the temporary concrete in advance, and the concrete is placed so as to enclose the pipes. After that, when the temporary concrete is removed, an expansive crushing agent is injected into the pipes, and the temporary concrete is crushed. According to the constitution, the temporary concrete can be easily crushed without generating sounds or dust.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a temporary concrete crushing method.

(Prior Art) Recently, expandable crushing agents have been used as one of the methods for crushing existing concrete and rocks.

This method takes advantage of the property of the expandable crushing agent to react with water and cause W3 expansion.The concrete or rock to be crushed is drilled, and the expandable crushing agent mixed with water is poured into the hole. It takes a lot of force to inject and crush concrete, etc.

On the other hand, during civil engineering work, for example, when pushing a fume pipe into a hole drilled underground with a jack in the construction of embedding a sewer pipe, a concrete plate is temporarily installed as a reaction plate, but after this work is completed, concrete -1~ must be removed. Even in civil engineering work in which temporary concrete is installed, an expansive crushing agent is used to crush the temporary concrete in the manner described above.

(Problems to be Solved by the Invention) However, this method generates noise when drilling concrete, etc. with a drilling tool (for example, a hand hammer), and also causes the powder of crushed concrete to fly away during drilling. There were environmental health problems such as:

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a new temporary concrete crushing method which eliminates the above-mentioned drawbacks and is particularly suitable for crushing temporary concrete.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a method for crushing temporary concrete, in which a pipe is installed in an area where temporary concrete is to be poured, and concrete is poured so as to surround the pipe. This method employs a temporary concrete crushing method characterized by crushing concrete by injecting an expansive crushing agent into a pipe.

(Example) Next, a preferred example of the present invention will be described with reference to the drawings.

Figure 1 is a schematic plan view of temporary concrete;
The Figures are a schematic (side view) of Figure 1 showing only one tube, Figure 3 is a perspective view showing a structure for fixing the tube, and Figure 4 is a side view of Figure 1 showing only one tube. FIG. 3 is a perspective view showing one tube;

For convenience of explanation, as an example, a method will be described in which concrete is temporarily installed underground as a reaction plate when pushing a large pipe in sewerage work, and the temporary concrete 1~ is crushed after the work is completed, but the present invention This method is not limited to such construction work, but can be applied to the case of crushing temporary concrete 1 to be installed at any desired location for the intended purpose.

As shown in Figure 3, concrete 1~ is temporarily installed underground.
In order to obtain the f! A liner plate 14 is installed in the arcuate portion that comes into contact with the surface, and then a pipe, preferably a spiral sheath pipe 16 (Fig. 4), into which a destructive crushing agent is injected for crushing after the construction is completed, is fixed. A structure 12 is provided for this purpose. This structure 12 is
For example, rod-like members made of reinforcing bars or wires are fixed to each other, and vertical rod-like members 12a are fixed to upper and lower horizontal rod-like members 12b fixed to the liner plate 14.

Next, as shown in FIG. 4, a large number of spiral sheath tubes 16 are arranged vertically at intervals and fixed to the upper and lower horizontal rod-shaped members 12b. In order to prevent sludge-like substances from entering and solidifying inside the spiral sheath tube 16, the lower part is sufficiently crushed and taped, and the upper part is plugged with a cloth 20 or the like.

In addition, if rainwater gets mixed in before injecting the expandable crushing agent,
Drain water using air.

Next, concrete 1~ is temporarily placed between the formwork and the liner plate.

Figures 1 and 212I are a plan and side view, respectively, of this temporary concrete (only one pipe is shown).

Next, for example, a jack (not shown) is placed in front of the flat side wall surface of the temporary concrete, and the jack is used to push the humid pipe (not shown) into the ground. At this time, the temporary concrete acts as a reaction plate. After this work is completed, the rag 20 on the top of the spiral sheath pipe 16 embedded in the temporary concrete is removed, and an expandable crushing agent mixed with water is injected into the spiral sheath pipe 6 to crush the temporary concrete.

An experimental example of the temporary concrete crushing method of the present invention will be explained below.

(Example 1) A 40φ spiral sheath tube was used as the tube, and the upper and lower ends of the spiral sheath tube were fixed to a rod-shaped member beside the structure. The number of spiral sheathed pipes used was 23, and these 23 spiral sheathed pipes were appropriately arranged front to back, left to right, and at intervals of about 45 cm over almost the entire area of the temporary concrete. The length of each spiral sheath tube was 2.9 m. "Plystar" (trade name) manufactured by Onoda Cement Co., Ltd. as an expansive crushing agent
was used. The amount of expanding crushing agent used is approximately 6.
1n, and about 14On in total.

As a result of the experiment, good crushing of temporary concrete was obtained.

(Example 2) 15 spiral sheath tubes with a length of about 4.51 mm are used as tubes, and each spiral sheath tube has a length of about 9.5 mm.
8n "Plystar" was used. Good results were again obtained in this case.

(Effects of the Invention) As explained in detail above, the present invention solves the disadvantages (noise,
This eliminates the generation of dust.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of temporary concrete. FIG. 2 is a schematic side view of FIG. 1 showing only one tube. FIG. 3 is a perspective view showing a structure for fixing the tube. FIG. 4 is a perspective view of one tube fixed to a structure. DESCRIPTION OF SYMBOLS 10... Hole, 12... Structure, 14... Liner plate, 16... Spiral sheath pipe. Figure Figure

Claims (5)

[Claims] (1) In the temporary concrete crushing method, a pipe is installed in the area where temporary concrete will be poured, concrete is poured so as to surround the pipe, and the concrete is crushed by injecting an expansive crushing agent into the pipe. A temporary concrete crushing method characterized by: (2) In the method for crushing temporary concrete according to claim 1, when pouring temporary concrete into the ground, before installing the pipe, drill a hole in the ground corresponding to the area where the temporary concrete will be poured, and insert the pipe into the hole. A temporary concrete crushing method characterized by providing a structure to be fixed and fixing a pipe to the structure. (3) The temporary concrete crushing method according to claim 2, wherein the structure is formed of reinforcing bars or wires. (4) The temporary concrete crushing method according to claim 2, wherein the hole has an arc-shaped cross section, and a liner plate is installed in the arc-shaped portion of the hole. (5) The temporary concrete crushing method according to any one of claims 1 to 4, wherein the pipe is a spiral sheath pipe.