JPH0941682A - Method and device for wire sawing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable concrete columns and wood columns driven in as foundation piles to be cut easily by replacement of a wire saw by holding constant the angle of contact between the wire saw and a subject to be cut, such as a concrete column, even as a cutting operation proceeds, and making a smooth cutting operation possible through the prevention of damage to a diamond wire saw. SOLUTION: An endless diamond wire saw 16 or a wire saw in which a wood-file-shaped projection is formed has a portion that makes contact with a subject to be cut and that rotates on a straight line so that the angle of contact between the portion and the subject to be cut is held constant. The endless wire saw 16 driven by a main pulley, or the wire saw provided with the wood-file-shaped projection on its surface, is rotatably provided inside a frame 9 except at the front end of a rectangle, and the frame 9 is advanced by a moving device 8.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a diamond wire saw (hereinafter, also simply referred to as a wire saw) for dismantling various kinds of concord structures (not limited to those which are in water) whose base portion is mainly in water. ) Belongs to the field of technology for dismantling or removing concrete structures, etc. for cutting concrete structures, etc.

[0002]

2. Description of the Related Art Conventionally, as an example, in order to dismantle a concrete structure in water, a dry closed chamber 27 whose lower surface is opened as shown in FIG. 6 is used.
A pulley 28 around which a diamond wire saw 16 is wound is attached so as to be rotatable by a motor, and a pair of guide rollers 29 and 30 are provided below the dry closed chamber 27, and the wire saw 16 is located from a lower end 31 of the dry closed chamber 27. The moving roller 32 at the bottom of the dry closed chamber 27 is mounted on the rail 34 of the mounting pedestal 33, and the piston 36 of the hydraulic cylinder 35 of the mounting pedestal 33 is extended to dry the roller 32. The closed chamber 27 is moved backward (to the left in FIG. 6) so that the endless wire saw 16 wound around the object to be cut 37 can be rotated and pulled at the same time.

The wire 16 engaged with the pulley 28
As shown in FIGS. 5 (A) and 5 (B), the peripheral surface of the cylindrical steel material 40 is usually made of artificial diamond fine particles 38 having a diameter and a length of about 10 mm and a wire insertion hole 39 at the center thereof. The diameter of the diamond beads 41 adhered to the surface is approximately the same as the diameter of the diamond beads 41 and the length is 20 mm.
A diamond wire saw 16 formed by alternately adhering a plastic spacer 43 having a wire insertion hole 42 at its center is wound.

An object to be cut 3 such as a concrete column in water
In order to cut 7, the endless wire saw 16 whose one end is engaged with the pulley 28 is wound around the object 37 to be cut, and the pulley 28 is pulled by the hydraulic cylinder 35 while being rotated by a motor. The other end of 16 comes into contact with the object to be cut 37 and rotates, cutting the corner 45 as shown by a broken line 44 while grinding the object to be cut 37 such as a concrete column, and further pulling by the hydraulic cylinder 35. It is known that the object to be cut 37 such as a concrete pillar is gradually cut as shown by a chain line 46 (see Japanese Patent Laid-Open No. 7-150775).

[0005]

As described above, when the wire saw 16 is wound around a concrete structure and pulled in an attempt to cut a concrete pillar or the like with the wire saw 16, the distance between the pulley 28 and the cutting point becomes a structure. If the wire saw 16 is suddenly subjected to a large load when it changes due to the outer shape of the object, the electric motor is damaged, the wire saw 16 spins idle, or the radius of curvature of the wire saw 16 gradually decreases and the diamond becomes smaller. It becomes difficult for the beads 41 to crush the spacers 43 and the diamond beads 41 come into contact with each other to damage the diamond beads 41, which makes it difficult to perform a smooth cutting operation, and a wooden column such as a pine tree is driven into the lower end of the concrete column as a foundation pile. If so, use a diamond wire saw 16 to cut it. If, because the action that is performed at the time of sliding the wire saw is grinding action without developing cutting action against the wood, simply has a disadvantage that it is impossible to cut the wood pillar simply runs idle.

The present invention eliminates the above-mentioned drawbacks and prevents the diamond wire saw from being damaged by making the contact angle between the wire saw and an object to be cut such as a concrete column constant even if the cutting work progresses. It is an object of the present invention to provide a cutting method and cutting device for a concrete column, which enables a smooth cutting operation, and can easily cut a wooden column driven as a foundation pile by replacing the wire saw. To do.

[0007]

In order to solve the above-mentioned problems, the present invention provides a wire sawing method according to claims 1 and 2 and a wire according to claims 3, 4 and 5. It is a measure of a sewing machine.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A case of carrying out the present invention will be described with reference to the drawings. In FIG. 1, a rail 2 (in this case, a monorail is used, but a plurality of rails may be used) is mounted on a mount 1 having an appropriate height,
As shown in FIG. 2, both sides of the rail 2 are sandwiched by wheels 3 having elasticity, traveling wheels 4 are movably placed below both sides of the rail 2, and chain wheels 5 are attached to the front and rear ends of the rail 2. (See FIG. 1) On the rear chain wheel 5, a driving air (or electric) motor 6 is provided and a chain 7 is engaged, and a moving device 8 is configured as a whole. A frame body 9 having a rectangular front end (left side in FIG. 1) removed is provided above the moving device 8.
For details, refer to the leg 4 a of the traveling wheel 4 behind the frame 9.
Is attached, and a base 11 having engaging legs 10 (see FIG. 2) is provided at the center of the lower surface of the rear connecting frame 9a. The engaging legs 10 engage with the chain 7 and move integrally with the chain 7. The main pulley 13 that is rotated by a hydraulic (or electric) motor 12 is attached to the upper center of the base 11 and the motor 12 and the main pulley 13 are enclosed by a closed box 14 to form the dry chamber 1
Make up 5.

In FIG. 3, guide rollers 17 for engaging and guiding the diamond wire saw 16 are provided on both sides of the front side (left side in FIG. 3) of the frame body 9 in a plane shape.
A little later, a vertically oriented guide roller 18 is provided, and one vertically oriented guide roller 19 is provided at the rear end (right end in FIG. 3) of the frame body 9 from its lower surface toward the upper main pulley 13. Guides the wire saw 16, and further guides the wire saw 16 to the lower surface of the other vertically oriented guide roller 19 by making a half turn above the main pulley 13.
Is engaged with each of the guide rollers 17, 18, 19 and the main pulley 13 and is endlessly wound as a whole, and a spring 20 (see FIG. 1) provided in front of the frame 9 causes a gap between the guide rollers 17 on both front sides. Wire saw 1
Tension is applied so that 6 has a linear shape.

When cutting an ordinary concrete column 21, a diamond wire saw 16 as shown in FIG. 5 mentioned in the above "Prior Art" is used.
When wood such as pine is driven into the center of the lower end of the concrete column 21 as a foundation pile, the wire saw 16a as shown in FIG. 4 is used. That is, as shown in FIG. 4 (B), woodworking file-like projections (saw blade-shaped projections may be provided on the entire surface of the steel bar 22 having a diameter of about 10 mm. The beads 24, which are cut to have a length of about 10 mm, and a plastic spacer 25 having the same diameter as the beads 24 and a length of about 20 mm are alternately inserted into the wire 26 and adhered. To do so.

A method of cutting the concrete prism 21 constructed in water will be described. In FIG. 3, the mounting base 1 shown in FIG. 1 is installed near the concrete prism 21,
Rotate the chain 7 of the rail 2 on the mount 1 to rotate the frame 9
Is moved forward (to the left) so that the wire saw 16 endlessly provided inside the frame 9 and having the front surface stretched linearly by the spring 20 contacts the concrete prism 21. In this state, the main pulley 13 The chain wheel 5 at the rear end of the rail 2 is rotated at the same time that the chain 7 is moved forward, and the diamond wire saw 16 is rotated and brought into pressure contact with the concrete prism 21, and the diamond wire saw 16 is ground by the wire saw. By making a groove in the concrete with the width of the diameter and continuing this operation, the depth of the groove is gradually increased and the concrete prism 21 can be cut.

During this operation, the wire saw 16 in contact with the concrete prism 21 maintains a straight line shape, so that the wire saw 16 is cut from the pulley 13 like the conventional one in which the wire saw 16 is wound around the object to be cut 37. The distance to the point does not change and therefore the wire saw 1
6 suddenly put a heavy load on the wire saw 16
Does not spin around and the wire saw 16
Since the diamond beads 41 are not bent, the diamond beads 41 do not crush the spacers 43, and the diamond beads 41 are brought into contact with each other so that they are not damaged and the smooth cutting operation is not impaired.

Next, in order to cut the concrete piles into which the wood such as pine is driven as the foundation piles at the lower end, the diamond wire saw 16 is removed from the inside of the frame 9, and the woodworking file-like projections are removed. A wire saw 16a, in which beads 24 having 23 formed on the entire surface and plastic spacers 25 are alternately passed through a wire 26, is linearly attached to the entire surface of the frame body 9, and the wire saw 16a is rotated and simultaneously cut. By pressing on the object, a wood pillar such as a pine can be quickly cut by a cutting action by a woodworking file-shaped projection different from the grinding action of the diamond wire saw 16.

[0014]

In the conventional wire saw, the length of the wire saw changes depending on the shape of the object to be cut, so that the wire saw is heavily burdened, the electric motor is damaged, and the wire saw runs idle. Or, as the radius of curvature of the wire saw becomes smaller, the diamond beads may crush the spacers and damage the diamond beads, making it difficult to perform a smooth cutting operation.In addition, wood is driven into the foundation piles at the bottom of concrete columns. In the case of being rare, there was a drawback that the cutting action could not be performed and it could not be put to practical use, but in the inventions of claim 1, claim 3 and claim 4, the length of the wire saw may change. Since it does not have the drawbacks of the prior art, and the inventions of claims 2 and 5 do not have the drawbacks of the prior art, the timber pillar can be cut at a high speed. Kill.

[Brief description of drawings]

FIG. 1 is a perspective view showing a case where the present invention is implemented.

FIG. 2 is an enlarged side view of a part of FIG.

FIG. 3 is a plan view showing the arrangement of the wire saw of the present invention.

FIG. 4 (A) is a front view of the novel wire saw of the present invention, and FIG. 4 (B) is an enlarged sectional view of a part thereof.

FIG. 5A is a front view showing a conventional wire saw, and FIG. 5B is an enlarged cross-sectional view of a part thereof.

FIG. 6 is a front view showing an outline of a concrete cutting device using a conventional wire saw.

[Explanation of symbols]

 2 rail 5 chain wheel 7 endless chain 8 moving device 9 frame 10 engaging leg 13 main pulley 16 diamond wire saw 16a wire saw 22 steel bar 23 woodworking filed projection 24 beads 25 plastic spacer 26 wire

Claims (5)

[Claims] 1. A portion of an endless diamond wire saw (16) that contacts the object (21) rotates linearly so that the contact angle with the object (21) is constant. Wire sawing method. 2. A wire sawing method using a wire saw (16a) having a woodworking file-like projection (23) formed on the surface thereof, in place of the diamond wire saw (16) of claim 1. 3. An endless wire saw (16) driven by a main pulley (13) is rotatably provided inside the frame body (9) from which a rectangular front end portion is removed, and the frame body (9) is attached to the frame body (9). A wire sawing device adapted to be moved forward by a moving device (8). 4. A moving device (8) is provided with chain wheels (5) at front and rear ends of a rail (2) to rotate an endless chain (7), and the endless chain (7) is provided with a frame body (9). The wire sawing device according to claim 3, wherein the engaging legs (10) of the above are engaged. 5. A wire saw (16a) in which beads (24) having woodworking file-like protrusions (23) formed on the entire surface of a steel bar (22) and plastic spacers (25) are alternately inserted into a wire (26). The wire sawing device according to claim 3, wherein the wire sawing device is used.