JPH05248102A - Device and method for cutting concrete structure - Google Patents

Abstract

PURPOSE:To cut safely and at low cost a concrete structure in an elevated place with a wire saw. CONSTITUTION:An arm 7 in a U-shaped external side face is fixed at its side wall on one side through a revolving ram 6 to the front end of a boom 5 that is extendable and adjustable in angles. The arm 7 is constructed in U-shaped cross section and guide pulleys 11 are provided to a cavity formed by the aforementioned U shape, and a wire saw 12 is stretched around the pulleys 11. Then cutting is made with the wire saw 12 that is driven and is pressed down to a structure to be cut, and the revolving ram 6 is turned, according to the angle of cutting required for cutting the structure to be cut. Thereby a concrete structure can be cut safely and at low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting machine for cutting a concrete structure at a high position such as a monorail or an elevated railway with a wire saw and a cutting method therefor.

[0002]

2. Description of the Related Art For example, a monorail or an elevated railway,
When cutting structures constructed above the ground, or pillars, bridge piers, etc., a wire saw equipped with a cutting blade is wound around the object to be cut, which is higher than the wire saw driving device installed on the ground. A method of hanging the wire saw and driving the wire saw at high speed by a driving device to cut the object is adopted. Since there are many incidental works in the cutting work, one team has 3 to 4 people.

Further, in order to horizontally cut an object to be cut at a high position with the wire, a scaffold is assembled up to the same height as the high position, and a wire saw driving device is installed there to cut horizontally. I was working.

Further, sometimes the cutting operation is performed by installing a wire saw driving device on the non-falling member of the object to be cut itself.

[0005]

In the above-mentioned conventional apparatus, when a wire saw driving device is installed on the ground to cut an object to be cut at a high place, for example, the height of the object to be cut is 10 m and the cutting area is 10 m. Is 1 m ² , the wire consumption length is about 1 m, and the wire saw traveling diagonally or vertically requires a length of 25 to 35 m, which is not only very expensive but also the wire for cutting. There was a defect that the running state of the saw became unstable.

Further, in the case of horizontally cutting an object to be cut at a high place, it is necessary to install a pulley mount and a temporary scaffold associated with the work, and there is a drawback that a lot of man-hours are required.

Further, it is difficult to stably install the wire saw driving device on the cutting object itself, and there is a problem in safety.

Further, the wire saw that circulates at a high speed of about 30 m / sec is easy to induce breakage due to the movement of the object to be cut or the cause such as clogging in the cutting groove. In addition, the wires often fly instantly due to the disconnection of the wire connection pins, which is dangerous. Therefore, an object of the present invention is to cut a concrete structure in a high place with a wire saw inexpensively and safely, and to reduce the number of work steps.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned drawbacks of the prior art, the present invention provides a wire saw driving device as a concrete structure cutting machine via a rotary ram at the tip of a boom whose expansion and contraction and angle can be adjusted. It is fixed and configured by providing a guide that guides the travel of the wire saw, and also via a rotating ram at the tip of the boom that can be expanded and contracted and angle adjusted,
One side wall of an arm having an outer side surface U-shape is fixed, a wire saw is stretched on a guide pulley provided in the space with the cross-sectional shape of the arm being U-shape, and the wire saw driving device is fixed to the arm, The wire saw hangs on the object to be cut that is located in the U-shaped space on the outer side surface, and the wire saw tension adjusting device is provided to construct the concrete structure cutting method. Drive the wire saw through the rotating ram,
The wire saw traveling along the guide is pressed against the object to be cut, and the rotary ram is rotated according to the cutting angle of the object to be cut. The wire saw driving device is fixed to the external C-shaped arm that is fixed to the rotating ram provided at the tip, and the wire saw arranged in the space of the arm with a U-shaped cross section is placed in the space of the U-shaped arm on the outer surface. The object to be cut is arranged to be pressed while being pressed with a constant tension, whereby the construction cost can be significantly reduced, the number of workers can be reduced, and the concrete structure can be cut.

[0010]

Since the present invention is configured as described above, when cutting an object to be cut at a high place, the boom is extended according to the height of the boom or the angle of the boom is adjusted to cut the object to be cut. The rotary ram is rotated according to the angle to set the position and angle of the wire saw, and the cutting is performed by driving the wire saw driving device. Also, when using a U-shaped arm, place the object to be cut in the space of the U-shaped arm on the outer surface, hang the wire saw, and drive the wire saw under a predetermined tension to cut the U-shaped arm. The arm remains immobile until the end of cutting.

[0011]

Embodiments of the present invention will be described with reference to the drawings. The boom is fixed to the construction machine or the truck 1 so as to be rotatable around the machine body 2, and can be expanded and contracted by the cylinders 3 and 4 to adjust the angle. Fix 1 side wall of 7. The intermediate wall 8 of the arm 7 can be expanded and contracted by a cylinder 9 to adapt to the outer shape of the object K to be cut. The cross-sectional shape of the arm 7 is U-shaped, and inside thereof, a corner portion 10 having a U-shaped outer surface.
Also, a guide pulley 11 is rotatably provided at the tip end portion to guide the wire saw 12. As a result, wire saw 1
2 runs inside the arm 7 having a U-shaped cross section.

A motor 13 that is operated hydraulically or electrically is provided at one end of the arm 7, and a pulley 14 that is rotated by the motor 13 and a pulley 1 fixed to the arm 7 are provided.
1. A wire saw 12 is stretched between the wire saw 12 and the wire saw 12, and the wire saw 12 is hung above the workpiece K located in the void of the arm 7 having a U-shaped outer surface, and the pulley 15 is attached to the wire saw 12. The wire tension is adjusted by hanging the weight 16 provided on the. Further, the arm 4 is provided with a water supply device 17 for supplying water to the cut portion to cool the cut portion and remove sludge. A fender 18 is provided on the outer circumference of the pulley 11, and a rope 19 for preventing the weight 16 from falling is provided between the pulley 11 and the pulley 15.

In the procedure and method for cutting a concrete structure using the above cutting machine, first, a wire saw 12 having a predetermined length is prepared on the U-shaped arm 7. At this time, the wire saw 12 is hung on the outer periphery of the object K to be cut, and both ends of the wire saw 12 are connected to form an annular shape. Then, the weight 16 at the bottom is lowered, and the wire saw 25 is tensioned. Then, the arm 7 is extended above the object K to be cut and stopped at a predetermined cutting position. When the object K to be cut is cut horizontally, the rotary ram 6 makes the arm 7 horizontal and the pulleys are rearranged. The workpiece K is cut by driving and traveling the wire saw 12, and the weight 16
Descends. Even if the arm 7 moves up and down, the wire saw will not be strained as in the conventional case,
As the weight 16 moves up and down, a constant tension is always applied to the wire saw.

Another embodiment of the present invention is shown in FIG. In this embodiment, similarly to the above-described embodiment, the motor 21 that is hydraulically or electrically operated is fixed to the frame fixed to the tip of the boom via the rotary ram.
The gear 23 is fixed to the rotary shaft 22 of the
A gear 24 meshing with the gear 3 is provided rotatably around a shaft 25. A guide bar 26 is extended on the shaft 25, and a wire saw 27 is attached to the motor 21 along the guide bar 26 and the gear 23.
Drive at high speed. The guide bar 26
A turnbuckle 28 for adjusting tension may be provided in the. On the other hand, a lifting / lowering motor 30 for the guide bar 26 is fixed to a gear 29 that meshes with the gear 24, and the rotation of the motor 30 causes the guide bar 26 to swing about the shaft 25 to cut the object to be cut.

The guide bar 26 has a height of 1 to 2 m and is adapted to the width of the object to be cut. Therefore, the height of the object to be cut and the cutting direction can be adjusted by extending the crane and adjusting the angle of the crane and the angle of the rotary ram.

The chain saw is formed, for example, by welding a diamond tip sintered body to the outside and the surface of the chain saw.

[0017]

Since the present invention is constructed as described above,
Since the wire saw drive device and the part to be cut are close to each other, the wire saw can be shortened, there is no need to assemble a temporary scaffold for installing the drive device on the main body or outside, the number of work steps is reduced, and the cost is low. Not only that, the running condition of the wire saw is stable and there is no instability when cutting. Further, the cutting portion can be easily cut at an arbitrary angle by rotating the rotary ram. Further, since the wire saw cutting part and the operator are separated, damage to the operator can be avoided when the wire saw is cut. Further, when the U-shaped arm is used, the wire saw mainly runs inside the U-shaped cross section, so that it is safe because it does not jump out when the wire saw is cut. Further, when the cooling water is supplied to the cutting portion, the water is received in the void of the cross-section square arm, and the amount of scattering is greatly reduced, so that the working environment is not deteriorated.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a sectional view of an arm of the present invention.

FIG. 3 is a side view of another embodiment of the cutting machine of the present invention.

[Explanation of symbols]

 1 Construction Machinery 2 Body 5 Boom 6 Hydraulic Rotating Ram 7 Arm 8 Intermediate Wall 9 Cylinder 11 Guide Pulley 12 Wire Saw 13 Motor 14 Pulley 15 Pulley 17 Water Supply Device 21 Motor 23 Gear 26 Guide Bar 27 Chain Saw 30 Lifting Motor

Claims (4)

[Claims] 1. A concrete structure cutting machine characterized in that a wire saw driving device is fixed to a tip of a boom capable of expanding and contracting and adjusting an angle via a rotary ram, and a guide for guiding traveling of the wire saw is provided. 2. A side wall of an arm having a U-shaped outer surface is fixed to a tip of a boom capable of expanding and contracting and adjusting an angle via a rotary ram, and the arm is provided in the void with a cross-sectional shape of the arm. Attach the wire saw to the guide pulley,
A concrete structure cutting machine characterized in that a wire saw driving device is fixed to an arm, a wire saw is hung on an object to be cut located in a U-shaped space on the outer side surface, and a wire saw tension adjusting device is provided. .. 3. A wire saw is driven via a rotary ram at the tip of a boom whose expansion and contraction and angle can be adjusted, and a wire saw traveling along a guide is pressed against an object to be cut and cut.
A concrete structure cutting method characterized by rotating a rotary ram according to a cutting angle of an object to be cut. 4. A wire saw driving device is fixed to an arm having an external C-shape fixed to a rotary ram provided at the tip of a boom whose expansion and contraction and angle can be adjusted, and the wire saw driving device is arranged in the space of the arm having a U-shaped cross section. A concrete structure cutting method characterized in that a wire saw is cut while pressing it with a constant tension against an object to be cut placed in a space of a U-shaped arm on the outer side.