JP2742198B2 - Cutting method for concrete structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting concrete structures such as reinforced concrete, various types of stones, standing trees, etc. (hereinafter simply referred to as concrete structures, etc.), and is particularly suitable for cutting concrete structures horizontally. Cutting method.

[0002]

2. Description of the Related Art In order to cut a concrete structure or the like, a method of making a straight cut into a concrete structure using a cutter equipped with a circular saw blade is usually employed. Cutting requires a blade with a diameter that is considerably larger than the thickness of the concrete structure or the like to be cut because the cutting depth is limited due to the mounting flange and the driving device provided at the center of the blade. . Moreover, when a square hole is to be formed, an extra cut is made up to an extension of each side, which has a defect that it remains as a flaw.

In order to solve the above-mentioned problem, Japanese Patent Publication No. 57-36126 discloses a method for drilling a circular hole in a concrete structure or the like by using a drill, and then providing the circular hole with a circular saw blade. A method has been proposed in which a device is inserted, a circular hole is used as a guide hole, and a cut is made at a tangential position of the hole with a circular saw-shaped diamond blade.

[0004]

In any of the above methods, when a concrete structure or the like is cut and separated using a circular saw-shaped blade, particularly when the cutting is performed in a horizontal direction, the cutting is performed with the progress of cutting. , The weight of the upper concrete structure etc. gradually applied to the blade, and the blade was crimped at the end of cutting, and it became impossible to rotate smoothly, requiring a large torque for the rotation of the blade, Eventually, it becomes stuck due to biting and the motor seizes.

An object of the present invention is to provide a cutting method capable of smoothly cutting a concrete structure or the like to the end without causing the above problems.

[0006]

According to the method for cutting a concrete structure or the like of the present invention, holes are formed at both ends of a surface to be cut, plugs made of a hard material are inserted into the holes, and plugs are inserted using a circular saw blade. It is characterized in that a straight cut is made between the stoppers. As the plug stopper used in the present invention, for example, concrete, metal, wood, hard plastics, etc. may be used as long as they have a considerable compressive strength. Those made of plastic are desirable.

[0007]

[Action] The concrete structure is cut by the notch reaching the plug stopper by the blade,
Although the plug is cut, the plug cannot be cut into the plug at the time of cutting.Even if the cut is made, the plug acts as a spacer until the plug is completely cut unless the entire plug is cut. The plug keeps a certain gap in the cut surface, thereby preventing the concrete structure or the like from being pressed against the blade.

[0008]

FIG. 1 shows an example of use when cutting a concrete structure 2 using a plunge cutter 1 as shown in FIG. 2. First, a horizontal cut is made at the center of the concrete structure 2 by a drill. A circular hole 4 is formed in contact with the planned surface 3, and plug plug insertion holes 5 are provided at both ends of the planned surface 3.
Are drilled so that one side thereof is open, and each insertion hole 5
The plug stopper 6 is pushed in from before and after.

Next, a plunge cutter 1 having a circular saw-shaped blade 7 having a diameter reaching both insertion holes 5 is inserted into the circular hole 4, and the blade 7 is aligned with the surface 3 to be cut, and a motor is driven. The surface 3 to be cut and a part of the plug plug 6 are cut while rotating and pushing the circular hole 4 as a guide. FIG. 3 shows the state at the end of cutting. In the front part that has been cut at the end of cutting, the concrete structure 2 above the cut surface 3 is supported by the plug plug 6 on the near side. The weight of the upper concrete structure does not rest on the blade 7 to impair the rotation of the blade 7. Further, even at the time of completion of cutting, since the upper concrete structure has the four corners supported by the plug stoppers 6, the plunge cutter can be easily extracted from the upper and lower concrete structures without crimping the blade 7. it can.

[0010]

The present invention is configured as described above and has the following effects. According to the method of the first aspect, the plug is interposed at both ends of the cut surface of the concrete structure or the like and functions as a spacer, and the cut concrete structure or the like is prevented from being pressed against the blade. Therefore, the blade can be smoothly rotated until the cutting is completed, and it is easy to remove the blade after the cutting is completed.

According to the method of the second aspect, it is possible to cut using a blade having the same diameter as the cutting width, so that even when cutting is performed with a fixed width, no extra cut is generated. If the plug stopper is made of plastic as in the method of claim 3, the plug can be easily manufactured and the blade is not damaged during cutting.

In the case of a horizontal cutting in which the weight of the concrete structure is easily applied to the blade as in the method according to the fourth aspect,
It is particularly suitable to carry out the method.

[Brief description of the drawings]

FIG. 1 is a perspective view of a concrete structure to be cut.

FIG. 2 is a perspective view of a plunge cutter.

FIG. 3 is a cross-sectional view of a concrete structure at the end of cutting.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Plunge cutter 2 ... Concrete structure 3 ... Planned cutting surface 4 ... Circular hole 5 ... Plug plug insertion hole 6 ... Plug plug 7 ... Blade

Claims (4)

(57) [Claims] 1. A hole is formed at each end of a cutting surface, a plug plug made of a hard material is inserted into the hole, and a linear cut is made between the plug plugs using a circular saw blade. Method for cutting concrete structures. 2. The method for cutting a concrete structure or the like according to claim 1, wherein a hole into which the plunge cutter is inserted is formed so as to be in contact with the surface to be cut. 3. The method for cutting a concrete structure or the like according to claim 1, wherein the plug stopper is made of a hard plastic. 4. The method for cutting a concrete structure or the like according to claim 1, wherein the plane to be cut is a horizontal plane.