JP3901650B2 - Cutting method of concrete structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for cutting a concrete structure, and more particularly, to a cutting method in which an improvement is made to a coolant supply method used for removing chips generated when cutting concrete and cooling a cutting tool. Regarding the method.
[0002]
[Prior art]
As a method of cutting various concrete structures such as columns, walls, and piers, a cutting method using an endless wire saw in which a number of carbide tips such as diamond are attached to a wire is known. This wire saw is wound around a concrete structure and cuts the concrete structure by being drawn in one direction while being circulated by a driving device.
[0003]
A coolant such as water is supplied to the kerf formed by the wire saw for the purpose of removing chips generated during cutting and for the purpose of cooling the wire saw that receives heat due to friction. The coolant is supplied by inserting an injection tube into the kerf. However, as the cutting operation progresses, the cutting surface (the surface where the wire saw comes into contact and the concrete structure is cut) is constantly changing. For this reason, the supply position must be changed with the progress of the cutting work, and the cutting work is interrupted each time, so the work efficiency is poor.
[0004]
Moreover, since it is injection | pouring from a kerf, a coolant is hard to be effectively supplied to a cutting surface. Moreover, the change of the cutting surface is difficult to understand from the outside, and it is difficult to always keep the supply position appropriately. These cause a shortage of coolant supply and cause wire saw biting, premature wear, and breakage. Furthermore, when an arbitrary supply position cannot be secured due to an obstacle or the like, it is necessary to bypass the supply path, and a large amount of coolant must be supplied. In this case, a large amount of cut sludge is generated.
[0005]
Therefore, a method for improving the coolant supply method has also been proposed (see Patent Document 1). This means that when a considerable amount of cutting has progressed, the sealing material is applied around the cuts placed in the reinforced concrete structure, or it is packed to close the cut, and the water inlet is inserted into the cut from an appropriate location to supply water. Is the method. However, since this proposed method is an improvement measure that is executed when a considerable amount of cutting has progressed, an appropriate coolant cannot be supplied from the beginning of cutting.
[0006]
[Patent Document 1]
JP-A-8-303019 gazette
[Problems to be solved by the invention]
The present invention has been made based on the technical background as described above, and achieves the following object.
SUMMARY OF THE INVENTION An object of the present invention is to cut a concrete structure that does not require a change in the coolant supply position and does not interrupt the cutting operation, and can always supply an appropriate amount of coolant at an appropriate position. Is to provide.
[0008]
[Means for Solving the Problems]
The present invention employs the following means in order to achieve the above object.
That is, when the endless wire saw is wound around a concrete structure and the concrete structure is cut, the present invention includes a cutting start side surface, a cutting end side surface and a cutting end side surface inside the concrete structure. A method for cutting a concrete structure, characterized in that a coolant supply hole penetrating between them is previously drilled and the concrete structure is cut through the supply hole while supplying coolant to the wire saw from the side surface at the end of cutting. is there.
[0009]
In this case, it is preferable to install a cover that covers the periphery of the planned cutting surface.
[0010]
As the coolant, a foamed foaming agent may be used.
[0011]
According to the present invention, the coolant supply hole always opens in the cutting surface of the concrete structure even when the cutting operation proceeds. Therefore, the coolant supplied to the supply hole is always supplied to the cutting surface of the concrete structure that is being cut by contact with the cutting tool. As a result, an appropriate amount of coolant can be supplied at an appropriate position all the time without interrupting the cutting operation.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a horizontal sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. This embodiment is an example in which a concrete structure P such as a pillar is vertically cut with a wire saw 1.
[0013]
The wire saw 1 is an endless one in which a number of carbide tips such as diamond are attached to a wire. Although not shown, the cutting machine main body 2 accommodates a pulley group including a driving pulley and a driven pulley, and the wire saw 1 circulates by driving the driving pulley. During the cutting operation, the wire saw 1 is wound around the concrete structure P. And while making the wire saw 1 circulate, the cutting machine main body 2 is drawn in the arrow direction, and the concrete structure P is thereby cut.
[0014]
According to this invention, the coolant supply hole 5 is drilled in advance between the cutting start side surface 3 and the cutting end side surface 4. The supply hole 5 is formed on a planned cutting surface 6 (shown by a chain line in FIG. 2) which is a virtual surface inside the concrete structure P. As a result, even if the cutting operation proceeds, the supply hole 5 always opens in the cutting surface 7 of the concrete structure P. The position of the wire saw 1 and the cutting surface 7 when the cutting operation has progressed are shown by chain lines in FIG. Further, in FIG. 1, the kerf is indicated by reference numeral 15.
[0015]
A coolant supply pipe 8 is connected to the supply hole 5 on the side surface 4 on the cutting end side. The coolant supplied to the supply hole 5 through the supply pipe 8 is always poured out toward the inner surface of the wire saw 1. This coolant is caught in the wire saw 1 and reaches the entire cutting surface 7. As a result, an appropriate amount of coolant can be supplied at an appropriate position all the time without interrupting the cutting operation.
[0016]
A cover 9 is attached to the outer periphery of the concrete structure P so as to surround the planned cutting surface 6. The cover 9 is of a half-cylinder shape, prevents splashing of the coolant and prevents the surroundings from becoming dirty, and prevents the worker from being harmed when the wire saw is cut.
[0017]
[0018]
[0019]
Although water can be used as the coolant, a foamed foaming agent is preferably used. When using foaming agents, the amount of sludge generated is smaller than when water is used, and the fluidity is low, so curing is easy, and continuous cutting is possible. There is.
[0020]
The above embodiment is merely an example, and the present invention can take various aspects. For example, in the embodiment shown in FIGS. 1 and 2 using a wire saw, only one coolant supply hole is provided, but a plurality of supply holes may be formed at predetermined intervals.
[0021]
【The invention's effect】
As described above, according to the present invention, it is not necessary to change the coolant supply position, so that the cutting operation is not interrupted, and an appropriate amount of coolant can be always supplied at an appropriate position. Thereby, working efficiency can be improved. In addition, the wire saw can be prevented from biting, premature wear, and breakage, and cutting sludge can be reduced.
[Brief description of the drawings]
FIG. 1 is a horizontal sectional view showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
1: Wire saw 2: Cutting machine main body 3: Cutting side surface 4: Cutting end side surface 5: Supply hole 6: Planed cutting surface 7: Cutting surface 8: Supply pipe 9: Cover P: Concrete structure

Claims (3)

When cutting an endless wire saw around a concrete structure to cut the concrete structure, the coolant passes through between the cutting start side surface and the cutting end side surface on the planned cutting surface inside the concrete structure. A method for cutting a concrete structure is characterized in that a concrete structure is cut while a supply hole is previously drilled and coolant is supplied to the wire saw from the side surface at the end of cutting through the supply hole. 2. The method for cutting a concrete structure according to claim 1, wherein a cover that covers the periphery of the planned cutting surface is installed. The method for cutting a concrete structure according to claim 1 or 2, wherein the coolant is a foaming agent.

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