JP6534837B2 - Dismantling method of concrete structure - Google Patents

Description

  The present invention relates to a method of dismantling a concrete structure.

Conventionally, dismantling work of a concrete structure is performed by cutting and crushing concrete using a cutter or a nibler attached to the end of a general purpose excavating machine such as a backhoe or an attachment called a breaker (Patent Document 1) , 2).
Or it is carried out by cutting concrete using a concrete cutter, a wire saw for concrete, etc. (refer to patent documents 3, 4).

Japanese Patent Application Laid-Open No. 2002-113377 Unexamined-Japanese-Patent No. 6-240889 JP, 2006-264099, A JP-A-6-42198

However, in the case of using the above-mentioned attachment, it is necessary to carry out a large amount of water spray over a wide area over and around the crushing point of the concrete structure in order to suppress dust generated during cutting and crushing. The suppression effect is also limited.
In addition, when using a concrete cutter or a wire saw for concrete, water can be supplied to the cutting point of concrete, so although dust can be suppressed, the size of concrete that can be cut is limited, so the efficiency of dismantling work Have the disadvantage of low cost.
The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a method of disassembling a concrete structure which is advantageous in suppressing dust while achieving cost reduction and improving efficiency of disassembling work. It is in.

In order to achieve the above-mentioned object, the dismantling method of the concrete structure of the present invention comprises a first step of excavating a plurality of injection holes extending from the surface of the concrete structure to the inside, and infiltrating the concrete structure. A second step of infiltrating the liquid into the interior of the concrete structure by pressurizing and injecting a possible liquid into each of the injection holes, and the concrete structure in a state in which the liquid infiltrates the inside of the concrete structure look including a third step of dismantling the object, the liquid is a liquid containing sugar or a liquid containing sugar and phosphate, characterized in that.

  Since the concrete structure is disassembled in a state where the liquid penetrates into the inside of the concrete structure, it is advantageous in suppressing dust while achieving cost reduction and improving efficiency of disassembling work.

It is explanatory drawing which shows the process of excavating a pouring hole in a concrete structure in the dismantling method of the concrete structure of embodiment. It is sectional drawing which shows the process of attaching an attachment to the injection hole of a concrete structure in the dismantling method of the concrete structure of embodiment. It is sectional drawing which shows the process of pressurizing and injecting a liquid in the injection hole of a concrete structure in the dismantling method of the concrete structure of embodiment. It is sectional drawing which shows the process of crushing the concrete structure which the liquid penetrated in the dismantling method of the concrete structure of embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a plurality of injection holes 12 extending inward from the surface of the concrete structure 10 to be disassembled are excavated using a variety of conventionally known tools such as a hammer drill 2 (first Process). The depth (drilling length) of the injection hole 12 is appropriately set in consideration of the liquid injection range described later. Moreover, as shown in FIG. 2, the attachment 14 is attached to the opening near the surface of the concrete structure 10 of the excavated injection hole 12.
The attachment 14 is such that the tip of a liquid injection hose 16 to be described later is detachably coupled, and the attachment 14 is attached to the opening of the injection hole 12 so that the opening of the injection hole 12 is closed by the attachment 14 Be done.
In the present embodiment, the attachment 14 is provided with a valve 1402 that opens and closes by manual operation.
Therefore, by opening and closing the valve in a state where the tip of the hose 16 is coupled to the attachment 14, it is possible to switch between execution and stop of pressurized injection of liquid from the hose 16 to the injection hole 12. There is.

  Next, as shown in FIG. 3, the tip of the fluid injection hose 16 is connected to the attachment 14, and the fluid which can permeate the concrete structure 10 from the fluid injection device 18 via the hose 16 is injected into each injection hole 12. The liquid L is made to permeate into the inside of the concrete structure 10 by pressure injection (second step). In the figure, the liquid L having permeated into the concrete structure 10 is indicated by dark hatching.

In the present embodiment, the liquid injection device 18 includes a hose 16 and a tank 20 connected to the hose 16 and installed at a height higher than the concrete structure 10 and containing the liquid L.
The pressurized injection of the liquid L is performed by the difference in head between the liquid L stored in the tank 20 and the liquid L injected into each injection hole 12.
The liquid injection device 18 may be configured to include the tank 20 for containing the liquid L, a pump (not shown) connected to the tank 20, and a hose 16 for liquid injection connected to the pump. Good.
However, according to this embodiment, the pump can be omitted, which is advantageous in simplifying the configuration and reducing the cost.

As the liquid L, water, a liquid containing a sugar that can penetrate the concrete structure 10, or a liquid containing a sugar and a phosphate can be used.
The use of water is advantageous in reducing costs.
Using a liquid containing sugar or a liquid containing sugar and phosphate improves the liquid retention (water retention) of the concrete structure 10 as compared to when water is used, and inject water once It is advantageous to maintain the dust control effect during dismantling of the concrete structure 10 for a long time. Further, since a liquid containing a sugar content or a liquid containing a sugar content and a phosphate is a material such as a food additive, it is also advantageous in securing safety.

  In addition, pressure injection of the liquid L in the second step is performed until the liquid L that has penetrated into the concrete structure 10 is saturated, in order to suppress dust generated at the time of dismantling the concrete structure 10. It is advantageous. The liquid L that has penetrated into the concrete structure 10 may be less than the saturated state, but in the case of this embodiment, the amount of the liquid L impregnated in the concrete structure 10 per unit volume is maximized. The generation of dust can be effectively suppressed.

As shown in FIG. 4, when the liquid L penetrates into the inside of the concrete structure 10, the concrete structure 10 is disassembled in that state (third step).
The disassembling method of the concrete structure 10 is not particularly limited.
For example, a tool such as a conventionally known concrete hammer 4 may be used, or a cutter or nibler attached to the tip of a general purpose excavating machine such as a backhoe or a cutting and breaking attachment called a breaker may be used. Good.
Alternatively, a rock rock hole is excavated in the concrete structure 10, and an expansive fracture type rock rock machine is inserted into the rock rock hole, and pressurized fluid is supplied to the inside of the rock rock machine to expand the sectional shape of the rock rock machine Cracks may be generated to crush the concrete structure 10.
Alternatively, the concrete structure 10 may be crushed by blasting using an explosive.

As described above, according to the present embodiment, a plurality of injection holes 12 extending from the surface of the concrete structure 10 toward the inside are excavated, and the liquid L capable of penetrating the concrete structure 10 is injected into each hole. The liquid L was made to permeate into the inside of the concrete structure 10 by pressure injection into 12, and the concrete structure 10 was dismantled in a state in which the liquid L had permeated into the inside of the concrete structure 10.
Therefore, it is advantageous in suppressing the generation of dust at the time of disassembly. In addition, since it is not necessary to spray water over a wide area of the concrete structure 10 and its surroundings extensively to suppress dust generated during cutting and crushing of the concrete structure 10 as in the prior art, the necessary minimum water is sufficient. This is advantageous in reducing the cost.
In addition, since it is not necessary to spray water at the fracture site of the concrete structure 10, dismantling in a wide range is possible. For example, dismantling the concrete structure 10 with a general purpose drilling machine can improve the efficiency of dismantling work It is advantageous to reduce the cost.

  L: liquid, 10: concrete structure, 12: injection hole, 14: attachment, 16: hose, 20: tank.

Claims (4)

A first step of drilling a plurality of injection holes extending inward from the surface of the concrete structure;
A second step of permeating the liquid into the concrete structure by pressure-injecting the liquid capable of penetrating the concrete structure into the injection holes;
Look including a third step of dismantling the concrete structure in a state in which the liquid has penetrated into the interior of the concrete structure,
The liquid is a liquid containing sugar or a liquid containing sugar and phosphate,
How to dismantle a concrete structure characterized by The pressure injection of the liquid in the second step is performed until the liquid that has penetrated the concrete structure is saturated.
The method of disassembling a concrete structure according to claim 1, characterized in that: Installing a tank containing the liquid at a height higher than the concrete structure;
The pressurized injection of the liquid in the second step is performed by a difference in head between the liquid contained in the tank and the liquid injected into the injection holes.
The dismantling method of the concrete structure according to claim 1 or 2, characterized in that In the first step, an attachment is attached to a point near the surface of the concrete structure of the drilled injection hole,
The second step is performed by detachably connecting the tip of a hose for pressurized injection of the liquid to the attachment.
The dismantling method of the concrete structure according to any one of claims 1 to 3, characterized in that:

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