JPH05332034A - Cutter - Google Patents

Abstract

PURPOSE:To apply/maintain tensile force automatically, and enable construction in a narrow space. CONSTITUTION:When cutting is carried out in a building frame 1, a through hole 2 is bored in a prescribed place of the main body 1, and a pulley driving device 3 is installed. The driving device 3 has a driving pulley 3a and a driving motor 3d. Fixed pulleys 5 and 5a are arranged on one side of the building frame 1, and a cutting height adjusting device 6 is installed on the other side, and the device 6 has a guide bar 6a, a fixed pulley 6b and a movable pulley 6c movable along the bar 6. A tensile force adjusting device 7 having a guide column 7a, fixed pulleys 7b and a movable guide pulley 7c movable vertically along the column 7a, is installed between the building frame 1 and the driving device 3. A wire 7f of a winch 7e is added to the column 7a, and the end part of the wire 7f is connected to the movable guide pulley 7c. A weight 7g is hung down from the winch 7e.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cutting reinforced concrete, stone materials, etc., and more particularly to a device for cutting reinforced concrete structures by running an endless diamond wire.

2. Description of the Related Art As a method for cutting concrete structures and stone materials, there is a large degree of freedom in terms of cutting area and cutting thickness, excellent cutting efficiency and workability, and effects on the external environment such as vibration and noise. The diamond wire saw method is known as a small method. As a general configuration of a cutting device used in this type of construction method, a pulley drive device that has a drive pulley that is rotationally driven and is installed at a predetermined distance from a structure to be cut, and the cutting target. It has an endless diamond wire wound between a structure and the drive pulley and run by rotation of the drive pulley. By the way, when cutting concrete structures with such a cutting device, the diamond wire
It is necessary to maintain a predetermined tension state at all times. As means for applying such a tension to a diamond wire, for example, Japanese Patent Publication Nos. 3-53426 and 3-53427 have a drive pulley mounted on a self-propelled table which can be moved back and forth. A means has been proposed in which tension is applied to the diamond wire by retracting the drive wheels of the table, and the retracting speed of the drive wheels is controlled as the cutting progresses to maintain the tension. However, the tension applying means disclosed in these publications has the technical problems described below.

That is, the means disclosed in the above publication requires a complicated control mechanism because the backward speed of the drive wheels is controlled as the cutting progresses to maintain the tension. There is a problem that the operation becomes troublesome and a space for retracting the self-propelled table is required, which is difficult to employ for cutting work in a narrow space. The present invention has been made in view of such conventional problems, and an object of the present invention is to automatically apply and maintain tension and enable cutting work in a narrow space. To provide a cutting device for a structure.

In order to achieve the above object, the present invention has a pulley drive device which has a drive pulley which is rotationally driven, and which is fixedly installed at a predetermined distance from a structure to be cut. An endless diamond wire wound between the structure to be cut and the drive pulley and run by the rotation of the drive pulley, and is installed between the pulley drive device and the structure to be cut. And a tension adjusting device for adjusting the tension of the diamond wire, wherein the tension adjusting device is movably supported by the guide column and the guide column is wound. It is characterized by comprising a movable guide pulley and a weight suspended on the movable guide pulley. Further, the cutting device having the above configuration has a cutting height adjusting device installed on the back side of the cutting target structure when the structure to be cut is cut in the vertical direction. A guide bar extending along a vertical cutting line of the structure to be cut, a fixed pulley installed at an upper end of the guide bar, and a movable pulley movably installed along the guide bar. You can

According to the cutting device having the above construction, a predetermined tension is applied to the diamond wire through the movable guide pulley by the gravity acting on the weight. As the cutting with the diamond wire progresses, the movable guide pulley is moved by the gravity acting on the weight, and the tension applied to the diamond wire by this movement is automatically maintained. Further, since the excess length portion of the diamond wire is absorbed by the movement of the movable guide pulley, the tension of the diamond wire can be maintained without the movement of the pulley drive device.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows an embodiment of a cutting device according to the present invention. The cutting device shown in the figure is a wall-shaped rebar concrete structure body 1 according to the present invention.
It shows the case where it is applied when the (cutting object structure) is cut in the vertical direction. The cutting device shown in the figure has a drive pulley 3a that is rotationally driven, and a pulley drive device 3 that is fixedly installed at a predetermined distance from the body 1, and between the body 1 and the drive pulley 3a. Is wound around the drive pulley 3
It has an endless diamond wire 8 that is run by the rotation of a, and a tension adjusting device 7 that is installed between the pulley driving device 3 and the skeleton 1 and that adjusts the tension of the diamond wire 8. .. In the cutting of the body 1, first, the through hole 2 is formed at a predetermined position of the body 1. Then, the pulley drive device 3 is installed at a rear position on the planned cutting line of the frame 1. The pulley drive device 3 is a drive pulley 3a.
From the fixed base 3b that rotatably supports the drive pulley 3a and is fixed to the floor, the gear box 3c connected to the rotation shaft of the drive pulley 3a, and the drive motor 3d connected to the gear box 3c. It is configured. Further, a pair of fixing pulleys 5 and 5a are arranged on one surface of the body 1 via a mounting base 4. A cutting height adjusting device 6 is installed on the other surface of the body 1. The cutting height adjusting device 6 extends in the vertical direction along a vertical cutting line of the frame 1 and has both ends fixed to the side face of the frame 1 with a predetermined gap, and a guide bar 6a and an upper end side of the guide bar 6a. A movable pulley that is fitted to a fixed pulley 6b arranged on the guide bar 6a and can be moved along the guide bar 6a and fixed at an arbitrary position of the guide bar 6a.
6c. The tension adjusting device 7 is
A substantially L-shaped guide strut 7a having an upper end bent horizontally and a lower end fixed on the floor, and a pair of fixed pulleys 7b fixed to the guide strut 7a at the same height position as the upper end level of the drive pulley 3a. 7 b, and a movable guide pulley 7 c that is mounted on the guide column 7 a and moves vertically along the guide column 7 a. A plurality of gold wheels 7d are attached to the horizontal portion of the guide column 7a, and a wire 7f of a winch 7e having a built-in motor is attached to the gold wheels 7d.
Is inserted, and the end of the wire 7f is connected to the movable guide pulley 7c. A weight 7g is suspended from the winch 7e. As shown in FIG. 1, the diamond wire 8 is wound around the devices 3, 6 and 7 configured as described above. The diamond wire 8 is in an endless state and is inserted from the outer periphery of the drive pulley 3a through the fixed and movable guide pulleys 7b and 7c of the tension adjusting device 7 through the fixed pulley 5 into the through hole 2 and further cut height. The adjusting device 6 is wound around the fixed and movable pulleys 6b and 6c, and the fixed pulley 5a in this order, and then returned to the drive pulley 3a. When the winding of the diamond wire 8 is completed, the cutting of the body 3 is started. As a preferable starting method at this time, first, the winch 7e is driven to position the weight 7g on the floor so that tension is not applied to the diamond wire 8, the drive motor 3d is started, and the diamond wire 8 is smoothly moved. After ensuring the running condition, winch 7
By driving e, the wire 7f is wound up so that a predetermined tension by the weight 7g is applied to the tire mond wire 8. When tension is applied to the diamond wire 8, cutting of the skeleton 1 is started by its running, the lower surface of the through hole 2 moves downward as the cutting progresses, and the tension of the wire 8 tends to decrease. At this time, the diamond wire 8
The gravity of the weight 7g acts on the movable guide pulley 7c via the winch 7e. Therefore, the looseness of the diamond wire 8 as the cutting progresses causes the movable guide pulley 7c to move to the weight 7
It is absorbed by being pulled up by g and the tension is automatically maintained. At this time, the magnitude of the tension applied to the diamond wire 8 can be arbitrarily adjusted by the weight 7g. And the cutting is the cutting height adjusting device 6
When the movable pulley 6c reaches the position, the cutting operation is temporarily stopped. In this case, the drive motor 3d may be stopped manually, but for example, the upward movement of the movable guide pulley 7c of the tension adjusting device 7 may be detected by a contact sensor and automatically stopped by a signal from this sensor. Next, the movable pulley 6c of the cutting height adjusting device 6 is lowered by a predetermined height, the movable pulley 6c is fixed at that position, and then the cutting operation is performed again. By repeating the above operation, the vertical cutting of the body 1 is completed. The cutting height adjusting device 6 is
The angle θ between the diamond wire 8 and the through hole 2 becomes an extremely acute angle, which is used to prevent damage to the wire 8. According to the cutting device configured as described above, a predetermined tension is applied to the diamond wire 8 by the gravity acting on the weight 7g. As the cutting with the diamond wire 8 progresses, the movable guide pulley 7c is moved by the gravity acting on the weight 7g, and this movement causes the diamond wire 8c to move.
The tension applied to is not only automatically maintained, but also cutting work is performed with the pulley drive device 3 fixed, so construction can be performed even when the working space is small.

As described above in detail, according to the cutting device of the present invention, a predetermined tension is introduced into the wire by the gravity of the weight, and this is automatically maintained during the progress of cutting. Therefore, the operation and control become extremely simple, and the work can be performed even when the work space is small.

[Brief description of drawings]

FIG. 1 is an explanatory view of a usage state of a cutting device according to the present invention.

[Explanation of symbols]

 1, 1a frame (structure to be cut) 2 through hole 3 pulley drive device 3a drive pulley 6 cutting height adjusting device 6a guide bar 6b fixed pulley 6c movable pulley 7 tension adjusting device 7a guide column 7c movable guide pulley 7g weight

Claims (2)

[Claims] 1. A pulley drive device having a drive pulley that is rotationally driven and fixedly installed at a predetermined distance from a structure to be cut, and between the structure to be cut and the drive pulley. An endless diamond wire that is wound and runs by rotation of the drive pulley, and a tension adjusting device that is installed between the pulley driving device and the structure to be cut and that adjusts the tension of the diamond wire. In the cutting device, the tension adjusting device includes a guide column, a movable guide pulley movably supported by the guide column, around which the diamond wire is wound, and a weight suspended by the movable guide pulley. And a cutting device. 2. The cutting device according to claim 1, further comprising a cutting height adjusting device installed on the back side of the structure to be cut when the structure to be cut is cut in the vertical direction. The height adjusting device includes a guide bar extending along a vertical cutting line of the structure to be cut, a fixed pulley installed at an upper end of the guide bar, and a movable pulley installed so as to be movable along the guide bar. And a cutting device.