JPH0516132A - Opening technique for concrete wall - Google Patents

Abstract

PURPOSE:To bore an opening even in a thick wall in a short time by boring respective corners on the periphery of an opening area and at least one site on the side connected with the adjoining corner, sawing through a diamond wire, cutting the wall and a core and dividing the core into a plurality of blocks. CONSTITUTION:For instance, in the case a square opening is bored in a concrete wall of substantial thickness, openings 1 for inserting a diamond wire are bored on the middle of respective sides connecting four corners and adjoining corners. Then, the diamond wire is hung over the adjoining openings 1 and sawing is applied. The arrangement is carried out successively, and a core 2 is separated from the concrete wall. Then the similar operation is carried out for the opening 1, upper and lower and also on the left and right, and the core 2 is divided into four block pieces. The core 2 is divided into small blocks so that the blocks can be drawn out even if some curves or recesses and projections are formed on the section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete wall body, and more particularly to an opening method suitable for forming an opening of a required size in a relatively thick concrete wall body.

[0002]

2. Description of the Related Art Conventionally, a method of using a blade type concrete cutter or a core drill has been used as a method of opening a concrete wall, but recently, a method of using a cutting cable made of a diamond wire saw has been actively used. Has become. This method involves the steps of forming cable through holes in the thickness direction at each corner around the open area of a concrete wall, wire sawing a cutting cable through adjacent cable through holes, and cutting and separating the periphery. The process consists of extracting the core that has been removed.

In such a construction method, if the wall body is thin, the core can be easily removed, but if the wall body has a thickness of several meters or more, it is difficult to remove the core. The reason is that it is unavoidable that some slack occurs in the cutting cable during wire sawing, so the cut surface tends to be curved or uneven, so when removing the core,
This is because it becomes an undercut state.

Japanese Patent Publication No. 2-48410 discloses a method of crushing and removing an edged inner core by a crusher. However, this method requires a considerable amount of labor and time to remove the core. High cost.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a construction method capable of efficiently forming an opening in a short time even in a concrete wall having a large thickness.

[0006]

According to the present invention, therefore, a step of drilling a hole through which a diamond wire is passed at least at one of the corners around the opening area of the concrete wall and the side connecting the adjacent corners, A construction method consisting of a step of sawing through a drilled hole through a diamond wire to cut the edge of the concrete wall and core and dividing the core into multiple pieces, and a step of extracting the divided core and forming an opening in the concrete wall Will be provided.

Either the edging or splitting of the core performed by wire sawing may be performed before or after, or the sawing for edging and the sawing for splitting may be mixed.

[0008]

[Function] When the core is cut into edges and divided into a plurality of pieces by sawing, the core becomes smaller blocks and the clearance between the core and the concrete wall body formed by the sawing increases, and the cut surface is slightly curved or uneven. Even if you can pull out.

[0009]

[Embodiment] The figure shows a construction method of forming a square hole in a concrete wall body having a considerable thickness. First, a diamond wire is provided at each of the corner portions of the four corners and the middle portion of each side connecting the adjacent corner portions. A hole 1 is formed to pass through. Then, a diamond wire is passed through the adjacent holes 1 and the sides are cut by sawing. The other side is similarly cut to separate the core 2 from the concrete wall.

Next, among the holes formed in the middle of the side,
A diamond wire is passed through each of the holes 1 on either the left or right side or the top or bottom side, and the core 2 is divided vertically or horizontally by sawing. Then, a diamond wire is passed through each of the other holes 1 in the same manner and sawing. Then, the core divided vertically or horizontally is further divided into four block pieces 2a, 2b, 2c and 2d.

According to this embodiment, the gap b formed by wire sawing cuts the core 2 in a cross shape, so that the gap 3b is formed upward as shown in FIG. A gap 3b can be formed on one side. The core 2 separated by cutting the periphery as described above is further divided into cruciform shapes, and then each block piece 2a, 2b, 2c, 2d is individually or plurally pulled out at once if possible. ..

In the above embodiment, the core 2 is cut in a cross shape, but depending on the shape and size of the core, it can be sawed out at several positions in the vertical and horizontal directions such as a cross beam, and obliquely if necessary. It is divided into various sizes.

[0013]

EFFECTS OF THE INVENTION According to the present invention, the core is made into small blocks by sawing, so that the gap is increased, and in combination with the small blocks, even if the cut surface is slightly curved or uneven, it can be extracted. Becomes Further, labor and time are reduced as compared with the conventional method of crushing and removing the core.

[Brief description of drawings]

FIG. 1 shows a cross-sectional view of a core cut and separated by wire sawing.

FIG. 2 shows a cross-sectional view of a quadrant.

[Explanation of symbols]

 1 ・ ・ ・ Hole 2 ・ ・ ・ Core

Claims (1)

Claim: What is claimed is: 1. A step of forming a hole for passing a diamond wire in at least one of the corners around an opening area in a concrete wall body and the side connecting the adjacent corners, and forming the hole. A concrete wall body consisting of a step of sawing a concrete wall body and a core and dividing the core into a plurality of pieces by sawing through a drilled hole with a diamond wire, and a step of extracting the divided core and forming an opening in the concrete wall body. Opening method.