JPH11262913A - Reinforced concrete cutting wire saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive to stabilize a cutting work by a method wherein the resistance developing by the contact of a wire saw with a reinforcing bar and the change of a load applied to the wire saw are reduced in the cutting of a reinforced concrete. SOLUTION: In a wire saw 10, main grinding members 11 and auxiliary grinding members 12 for cutting reinforcing bars are arranged along the longitudinal direction of a wire rope 13 at the ratio of 3:1 in proportion to the arrayal interval of reinforcing bars. The main grinding member 11 is made of diamond particles 15 and the binding material 16 of a metal sinter. The auxiliary grinding member 12 is made of aluminum oxide particles 17 and a resin binding material 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire saw used for cutting reinforced concrete.

[0002]

2. Description of the Related Art Wire saws and the like have conventionally been used as tools for cutting hard materials such as concrete and stone. This wire saw is, as shown in FIG.
An annular grinding member 52 having an abrasive part 51 formed by an electrodeposition method or a metal sintering method on the outer periphery of a steel wire rope 53 is provided at regular intervals, and ends of the wire rope 53 are connected. To form an endless annular body, and furthermore, the outer periphery of the wire rope 53 between the grinding members 52 is covered with a covering material 54 such as rubber or synthetic resin to form a spacer portion 55.

Further, in such a wire saw, a wire saw which prevents the abrasion of the wire rope 53 due to the abrasion of the spacer portion 55 is disclosed in Japanese Patent Application Laid-Open No. 3-281117. This wire saw mixes and disperses hard particles such as aluminum oxide and silicon carbide into the spacer part and improves the wear resistance of the entire spacer part, thereby reducing the wear of the spacer part by hitting the corner of the workpiece. It is intended.

[0004] When cutting reinforced concrete in which a reinforcing bar is arranged in concrete, the wire saw shown in FIG. 3 or the wire saw described in Japanese Patent Application Laid-Open No. 3-281117 has a cutting speed during the cutting operation. And the current consumption of the driving motor may fluctuate greatly. This is because the sharpness is reduced when the wire saw cuts the reinforcing steel in the reinforced concrete, and such reduced sharpness causes a reduction in cutting speed and an increase in power consumption.

[0005] That is, since the most suitable abrasive grains for the object to be cut differ depending on the material of the object to be cut, when the grinding member cuts the reinforced concrete using a wire saw having a single property, the material of the object to be cut is The cutting speed and current consumption fluctuate greatly due to the difference, which leads to a decrease in efficiency of the entire cutting operation, an increase in energy consumption, a reduction in tool life, and the like.

In the case of the wire saw described in Japanese Patent Application Laid-Open No. 3-281117, it is possible to extend the life of the tool by suppressing the wear rate of the spacer portion when cutting the corner portion of the workpiece. However, since only a single abrasive layer is used to cut an object to be cut, the above problem is encountered when cutting reinforced concrete. In addition, there is a problem that the flexibility of the wire saw is lost, and it becomes difficult to cut a deformed object having a complicated shape.

In addition, since hard particles are dispersed throughout the spacer portion to enhance wear resistance, as the cutting area of the object to be cut increases, the formation of the cooling water supply passage and the chip discharge passage in the cutting portion is increased. As a result, friction between the wire saw and the object to be cut increases, cutting speed decreases, current consumption increases, and the like, as well as adverse effects such as abnormal wear and damage of the wire saw itself.

[0008] In order to solve such a problem, a wire saw suitable for cutting reinforced concrete has been disclosed in Japanese Utility Model Publication No. 7-4257.
No. 5 has proposed a wire saw. In this wire saw, in addition to a large number of diamond beads, in addition to a large number of diamond beads, tungsten carbide, carbide particles such as boron nitride are dispersed and embedded in a binder, and a cutting tool for rebar cutting having the same diameter as the diamond beads is adjacent to the wire saw. According to this wire saw, concrete is cut by diamond beads, and cutting of reinforcing steel is performed by a cutting tool for cutting reinforcing steel, whereby cutting of reinforced concrete is performed efficiently. It can be done.

[0009]

However, the wire saw described in Japanese Utility Model Publication No. 7-42575 is a wire saw for cutting a concrete structure having a high ratio of reinforcing bars, in which diamond beads and cutting tools for cutting a reinforcing bar are alternately used. In this case, the spacing between the rebar cutting tools is small. For this reason, when the rebar ratio is low, that is, when the arrangement interval of the rebar in the concrete is large, the number of the cutting tools for rebar cutting is too large,
As a result, the cutting ability of concrete is reduced.

Further, if the arrangement intervals of the rebar cutting tools are determined irrespective of the rebar arrangement intervals, the timing at which the rebar cutting tools come into contact with a plurality of rebars differs from one another, and There is a drawback that the cutting of concrete and the cutting of rebar overlap at the same time or do not overlap, so that the contact resistance and the load fluctuate greatly and the cutting work is not stable.

The problem to be solved by the present invention is to reduce fluctuations in resistance and load at the time of contact with a reinforcing bar when cutting reinforced concrete, and to stabilize the cutting operation.

[0012]

According to the present invention, there is provided a wire saw for cutting reinforced concrete, comprising a grinding member for cutting concrete and a grinding member for cutting reinforcing steel. The spacing between the grinding members is set to be proportional to the spacing between the reinforcing bars of the reinforced concrete.

[0013] By providing the wire saw with a grinding member for cutting concrete and a grinding member for cutting reinforcing steel, it is possible to efficiently perform the work of cutting reinforced concrete. That is, a grinding member for concrete cutting contains grinding abrasive grains suitable for cutting concrete, for example, diamond particles, and a grinding member for cutting reinforcing steel, grinding abrasive grains suitable for cutting reinforcing steel, for example, aluminum oxide particles or the like. If silicon carbide particles are included, during cutting work, concrete is cut by a grinding member for concrete cutting, and rebar is cut by a grinding member for reinforcing bar cutting. Changes in sharpness during work are reduced, work efficiency is improved, and energy consumption can be reduced.

In this wire saw, by setting the spacing between the reinforcing members for cutting the reinforcing bars to be a spacing proportional to the spacing between the reinforcing bars of the reinforced concrete, a plurality of reinforcing bars can be provided with respect to the plurality of reinforcing bars arranged at regular intervals. Since the cutting grinding members come into contact at the same timing, fluctuations in contact resistance and load are reduced, and the cutting operation is stabilized.

In order to set the spacing between the reinforcing members for cutting the reinforcing bars to be proportional to the spacing between the reinforcing bars, the proportion of the grinding members for cutting concrete and the reinforcing members for cutting the reinforcing bars corresponding to the spacing between the reinforcing bars. Can be changed. In view of the practical arrangement intervals of the grinding members, the arrangement ratio of the grinding member for concrete cutting and the grinding member for cutting the reinforcing bar is appropriately in the range of 2: 1 to 10: 1.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway sectional view showing the wire saw of the first embodiment.

The wire saw 10 of this embodiment has a main grinding member 11 for cutting concrete and an auxiliary grinding member 12 for cutting reinforcing steel arranged at a ratio of 3: 1 along the longitudinal direction of the wire rope 13. . The main grinding member 11 is composed of diamond particles 15 and a binder 16 of a metal sintered body, and the auxiliary grinding member 12 is composed of aluminum oxide particles 17 and a binder 18 of resin.

With this configuration, when cutting reinforced concrete, the main grinding member 11 cuts the concrete, and the auxiliary grinding member 12 cuts into the reinforcing bar to cut the reinforcing bar. This reduces changes in sharpness and fluctuations in cutting speed during cutting work,
Work efficiency can be improved and energy consumption can be reduced.

Further, by using a wire saw in which the auxiliary grinding members 12 are arranged at intervals corresponding to the arrangement interval of the reinforcing bars in the concrete, a plurality of reinforcing bars arranged at a constant interval in the concrete can be used. The two auxiliary grinding members 12 come into contact at the same timing, so that the variation in contact resistance and load is reduced, and the cutting operation is stabilized.

FIG. 2 is a graph showing the relationship between the cutting area and the power consumption when cutting reinforced concrete using the wire saw 10 shown in FIG. 1 and the conventional wire saw shown in FIG. As shown in the figure, in the case of the conventional wire saw, the power consumption fluctuates greatly during the cutting operation, and the power consumption increases as the cutting area increases. That is, when reinforced concrete is cut with a conventional wire saw, the sharpness is reduced each time the wire saw cuts the reinforced portion, and the power consumption is increased accordingly. Also, it can be seen that the power consumption increases as the cutting operation progresses.

On the other hand, when the reinforced concrete is cut with the wire saw 10, the increase in power consumption when the wire saw cuts the reinforced portion is extremely small as compared with the conventional wire saw, and the power consumption increases even when the cutting area increases. You can see that he did not. As described above, when the reinforced concrete is cut using the wire saw 10, the fluctuation of the sharpness during the cutting operation is small, the fluctuation of the power consumption is also small, and the working efficiency is improved, and the power consumption can be reduced.

The arrangement ratio of the main grinding member 11 and the auxiliary grinding member 12 of the wire saw 10 of the present embodiment is 3: 1, but it is needless to say that this ratio can be changed by the arrangement interval of the reinforcing bars. . Since the arrangement interval of the reinforcing bars varies depending on the concrete structure, in order to cut the reinforced concrete having the different arrangement intervals of the reinforcing bars, a wire saw in which the arrangement ratio of the main grinding member 11 and the auxiliary grinding member 12 is changed is prepared. What is necessary is just to use a wire saw according to the rebar arrangement interval of the object to be cut.

[0023]

According to the present invention, the following effects can be obtained.

(1) In a wire saw provided with a grinding member for cutting concrete and a grinding member for cutting reinforcing steel, the spacing between the grinding members for cutting reinforcing steel is set to an interval proportional to the spacing between reinforcing bars of reinforced concrete. A plurality of rebar cutting grinding members come into contact with a plurality of rebars arranged at regular intervals at the same timing, thereby reducing fluctuations in contact resistance and load and stabilizing the cutting operation. .

(2) The arrangement ratio of the grinding member for cutting concrete and the grinding member for cutting reinforcing steel is 2: 1 to 10: 1.
By doing so, the arrangement interval of the grinding members for cutting the rebar can be set to be an interval proportional to the rebar arrangement interval within a practical range.

(3) Suitable for cutting reinforced concrete by using diamond particles as grinding particles for grinding members for concrete cutting and using aluminum oxide particles or silicon carbide particles as grinding particles for grinding members for cutting reinforcing steel. Wire saw.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view showing a wire saw of a first embodiment.

FIG. 2 is a graph showing a relationship between a cutting area and power consumption in a cutting operation using the wire saw of FIG. 1 and a conventional wire saw.

FIG. 3 is a partially cutaway sectional view showing a conventional wire saw.

[Explanation of symbols]

 Reference Signs List 10 wire saw 11 main grinding member 12 auxiliary grinding member 13 wire rope 15 diamond particles 16 binder 17 aluminum oxide particles 18 binder

Claims (3)

[Claims] 1. A wire saw for cutting reinforced concrete comprising a grinding member for cutting concrete and a grinding member for cutting reinforcing steel, wherein an arrangement interval of the grinding members for cutting the reinforcing bar is proportional to an arrangement interval of reinforcing bars of reinforced concrete. A wire saw for cutting reinforced concrete, characterized by spacing. 2. The arrangement ratio of the grinding member for cutting concrete and the grinding member for cutting reinforcing steel is 2: 1 to 10: 1.
The wire saw for cutting reinforced concrete according to claim 1, wherein 3. The grinding grain of the grinding member for cutting concrete is diamond particles, and the grinding grain of the grinding member for cutting reinforcing steel is aluminum oxide particles or silicon carbide particles. Wire saw for cutting reinforced concrete.