JPH08296332A - Cutting device of reinforced concrete structure - Google Patents

Abstract

PURPOSE: To easily install a cutting device by fixing a driving pulley to a movable self-propelled platform along a rod projected to a structure, fixing guide pulleys to an arm fixed to the rod, and hanging a wire saw over both pulleys. CONSTITUTION: A mounting platform 4 is fixed to a structure 1 by clamping a nut to an anchor bolt projected to the reinforced concrete structure 1. An arm 7 is mounted at right angles to a rod 6 having a rack 5 projected sideways from the mounting platform 4. A wire saw 13 is hungover the reinforced concrete structure 1, guide pulleys 8a, 8b and 8c and a driving pulley borne on a movable self-propelled platform 12 along the rod 6 and, at the same time, the circumference of the driving pulley 11 is coated with a pulley cover 21. Then, insertion sections 18 of side covers 15 and 16 are inserted in the arm ends from both sides of the arm 7, at the same time, anchor bolts projected to the structure 1 pass through mounting holes of straps 17 of the side covers 15 and 16 and are fastened with nuts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device for cutting walls, floors, ceilings or bridge piers, dikes, various plants and other reinforced concrete structures of buildings, subways, underground malls, etc. by wire sawing.

[0002]

2. Description of the Related Art A wire saw cutting device generally comprises a wire saw driving device having a drive pulley and capable of moving forward and backward. After installing the device at a location away from the reinforced concrete structure so that it can advance and retreat toward the reinforced concrete structure, an endless wire saw is hung over the reinforced concrete structure via the drive pulley and the guide pulley, and the wire saw is driven by the drive pulley. The wire saw driving device is retracted from the reinforced concrete structure so that the wire saw does not loosen while making a cut in the reinforced concrete structure by circulating the wire saw, and means for retracting the wire saw driving device. as By installing a rail for moving the wire saw driving device and driving a drive wheel rolling on the rail, or by attaching a weight for urging the wire saw driving device to move in one direction, the wire saw Move the wire saw drive along the rack by rotating the pinion by engaging the pinion provided in the wire saw drive with the rack that is installed on the rack or the rack that is installed on the rack. Among them, the one that can be installed anywhere, and that moves along the latter rack that can be reliably retracted without slipping is often used.

The wire saw driving device as described above is generally installed at a position distant from the reinforced concrete structure to be cut, but there is a device which can be installed directly on the reinforced concrete structure (Japanese Patent Laid-Open No. 5-141106).
issue). In each of the above-mentioned devices, when cutting a reinforced concrete structure, it is necessary to attach a wire saw drive device and a guide pulley, and to attach the device, centering the drive pulley and the guide pulley, that is, the drive pulley and Make sure that the tangent lines of the guide pulley match.
The position and orientation of each pulley had to be adjusted, which made setting up the device considerably troublesome.

[0004]

The applicant of the present application has previously proposed in Japanese Patent Application No. 6-199187 a cutting device capable of easily performing the above-mentioned setting work. As shown in FIGS. 1 and 2, this device includes a mounting base 4 fixed to a reinforced concrete structure 1 by fastening a nut 3 to an anchor bolt 2 projecting from the structure, and a mounting base 4 side of the mounting base 4. Rod 6 projecting toward one side and having a rack 5 attached thereto, and the rod 6
The arm 7 fixed to the mounting base side of the rod 6 at right angles to the rod 6.
A guide pulley 8a, 8b, 8c that is attached to the arm 7 so that its mounting position is adjustable, and a pinion that is rotationally driven by a motor 9 and that meshes with the rack 5 and a drive pulley 11, and moves to the rod 6. Self-propelled stand 12 that can be installed
And an endless wire saw 13 that is hung on the reinforced concrete structure 1 and then hung on the drive pulley 11 via a guide pulley. Each pulley 8a, 8b, 8c
Are mounted on the same plane so that it is not necessary to adjust the direction and position of each pulley one by one for centering.

The present invention further improves the above-mentioned cutting device, and the wire saw breaks and jumps around during cutting, or the wire saw released from the reinforced concrete structure is released at the same time as the cutting ends. This is to prevent the risk of

[0006]

SUMMARY OF THE INVENTION Therefore, the present invention provides a cutting device as described above, that is, a mounting base detachably fixed to a reinforced concrete structure, a rack, a rod supported laterally by the mounting base, and a motor. Has a drive pulley that is driven to rotate by and a pinion that meshes with a rack, and is supported by a self-propelled table that is movably mounted on a rod and a mounting table
In a reinforced concrete structure cutting device comprising a plurality of guide pulleys arranged on the same plane together with a drive pulley and an endless wire saw that is hung on a reinforced concrete structure and then hung on the drive pulley through the guide pulley. A safety cover for a wire saw is provided between the guide pulley and the drive pulley. Preferably, the wire saw to be hung on the drive pulley is also provided with a safety cover surrounding the wire saw.

The safety cover has a U-shaped, U-shaped and V-shaped cross section.
Normally, it is attached to the arm or the reinforced concrete structure in the form of a gutter, but the structure may be plate-like, net-like, grid-like, or may be bellows-like and expandable. . In the case of forming a bellows shape, for example, a locking metal fitting such as a hook is provided at one end and is hooked on an annular metal fitting attached to a safety cover for a wire saw which is hung on a self-propelled table or a drive pulley.

[0008]

Operation: Even if the wire saw breaks or is released from the reinforced concrete structure at the end of cutting and tries to jump, the safety cover prevents the jump.

[0009]

EXAMPLE As shown in FIG. 4, the side covers 15 and 16 shown in FIGS. 1 to 3 each have a U-shaped cross section and have a patch plate 17 for the reinforced concrete structure 1 at one end. An arm 7 with a rectangular cross section at a position spaced apart from 17 by a constant distance.
It has the insertion part 18 inserted in. Then, the mounting is performed by the reinforced concrete structure 1 and each guide pulley 8
After the wire saw 13 is stretched over a, 8b, 8c and the drive pulley 11, the insertion portion 1 is inserted from both sides of the arm to the arm end.
It is attached by inserting 8 (FIG. 2). As shown in FIG. 4, the side covers 15 and 16 may be attached by inserting an anchor bolt projecting from the reinforced concrete structure 1 into an attachment hole 19 formed in the backing plate 17 and tightening a nut. it can.

The pulley cover 21 covers the circumference of the drive pulley 11 which is attached to the self-propelled table 12 and on which the wire saw 13 is hung. Each of the side covers 23 and 24 shown in FIG. 5 is expandable and contractible in a bellows shape, and has a hook 25 hooked to the arm end at one end and an annular metal fitting 26 attached to the safety cover 21 at the other end. Hook 2
Have 7.

[0011]

The present invention is configured as described above and has the following effects. According to the cutting device of claim 1,
If the wire saw breaks during cutting or is released from the reinforced concrete structure when the cutting is completed, even if the wire saw jumps, does it hit the safety cover and scatter around? It is almost eliminated, and safety can be secured when the wire saw breaks or when cutting is completed.

According to the cutting device of the second aspect, the safety cover can be easily and easily attached to the cutting device only by inserting the insertion portion into the arm end. According to the cutting device of the third aspect, the safety cover can be directly attached to the reinforced concrete structure. In the safety cover according to the fourth aspect, the safety cover can be shrunk to be compact when not in use.

According to the cutting device of the fifth aspect, it is possible to completely prevent breakage of the wire saw and scattering of the wire saw when the cutting is completed.

[Brief description of drawings]

FIG. 1 is a front view of a cutting device before a side cover is attached.

FIG. 2 is a front view of a cutting device with a side cover attached.

FIG. 3 is a plan view of the cutting device shown in FIG.

FIG. 4 is a sectional view taken along the line AA of FIG.

FIG. 5 is a schematic view of a cutting device to which another side cover is attached.

[Explanation of symbols]

1 ... Reinforced concrete structure 4 ... Mounting stand 6 ... Rod 7 ... Arms 8a, 8b, 8c ... Guide pulley 11 ... Drive pulley 12 ... Self-propelled stand 13 ... Wire saw 15 , 16, 23, 24 ・ ・ Side cover 17 ・ ・ Attachment plate 18 ・ ・ Insertion part 19 ・ ・ Mounting hole 21 ・ ・ Pulley cover 25, 27 ・ ・ Hook 26 ・ ・ Ring

Claims (5)

[Claims] 1. A mounting base removably attached to a reinforced concrete structure, and a rack. The rod is supported by the mounting base and extends laterally. The rod is meshed with a drive pulley and a rack that are rotationally driven by a motor. A self-propelled table that has a pinion and is movably mounted on a rod, a plurality of guide pulleys that are supported by a mounting table and are arranged on the same plane as a drive pulley, and after being hung on a reinforced concrete structure, a guide A cutting device for a reinforced concrete structure including an endless wire saw that is hung on a drive pulley through a pulley, wherein a safety cover for the wire saw is provided between the guide pulley and the drive pulley. 2. The cutting device according to claim 1, wherein the safety cover has an insertion portion which is attached orthogonally to the rod and which is inserted into an end portion of an arm to which each guide pulley is attached. 3. The cutting device according to claim 1, wherein the safety cover has a contact plate for the reinforced concrete structure, and the contact plate has an attachment hole through which an anchor bolt protruding from the reinforced concrete structure passes. 4. The cutting device according to claim 1, wherein the safety cover has a bellows shape and is expandable and contractable, and at least one of both ends has a locking metal fitting. 5. The cutting device according to claim 1, further comprising a safety cover that covers a peripheral edge of the drive pulley on which the wire saw is hung.