JPH0353426B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to buildings, bridges, foundations, large plants,
Concerning cutting and demolition methods for subways, nuclear power plants, and other reinforced concrete structures.

[Conventional technology] As a demolition method for reinforced concrete structures,
Conventionally, methods of destruction using the expansion pressure of explosives or chemicals or gas pressure, steel balls,
Methods of crushing using a vibrating hammer or hydraulic pressure, and methods of cutting using a disc-shaped blade or a water jet using water pressure are known.

[Problems to be solved by the invention] However, the above-mentioned method of destroying with explosives, etc. and method of crushing with steel balls, etc. are both suitable for completely dismantling the target structure, and therefore, the method of destroying the structure with It can hardly be used for partial disassembly. In addition, these demolition methods have a large impact on the surrounding environment due to blast waves, vibrations, impact sounds, noise, dust, etc., and therefore the locations and conditions of use are severely restricted.

On the other hand, the method of cutting by rotating a disc-shaped blade is suitable for partial demolition of a structure, and is widely used for reinforcement, extension, or renovation of a structure as it ages. However, the blade type cutting machine
Due to blade manufacturing and handling considerations, blades are made smaller and lighter, resulting in inferior cutting ability, the cutting cross-sectional area is limited to a narrow range, and the thickness that can be cut is limited to 30~30 mm.
The maximum length is about 40cm. In addition, in the case of partial cutting using the rotation of a disc-shaped blade, there are problems such as the need to overcut areas that do not require cutting, and the blade-type cutting machine must be cut along a guide rail attached to the wall surface to be cut. The conventional construction method of moving and driving had problems with safety and workability.

In addition, a cutting method using a water jet that uses water pressure can be used for partial demolition of structures, but its cutting ability is significantly inferior and requires large mechanical equipment, and the cutting surface spreads out in a radial manner. I encountered the above problem.

Therefore, an object of the present invention is to cut required parts of a reinforced concrete structure, including internal reinforcing bars, at an extremely high cutting speed, with good workability and safely, without being limited by the cutting cross-sectional area or cutting thickness. It is an object of the present invention to provide a demolition method that allows cutting and demolition in a state where the influence on the external environment such as vibration, noise, dust, etc. is extremely small.

[Means for Solving the Problems] The method for cutting and dismantling a reinforced concrete structure according to the present invention involves winding a cutting cable made of a wire with ultra-hard beads attached at appropriate pitches around the reinforced concrete structure, and rotating the structure about its axis. A drive wheel of a self-propelled platform fitted into a rack whose angle can be adjusted is used to adjust the running speed and tension, and the drive wheel is moved backward as the cutting cable circulates while water is being poured. A method for cutting and dismantling a reinforced concrete structure characterized by cutting a cutting cable into the reinforced concrete structure, and a cutting method for cutting and dismantling a reinforced concrete structure characterized by cutting a cutting cable into the reinforced concrete structure, and in the method for cutting and dismantling a reinforced concrete structure, the cutting is performed by alternately inserting ultra-hard beads and cylindrical sleeves into a steel wire. The ultra-hard beads are characterized by having a diamond grain surface layer.

[Function] In the above, the cutting cable is driven to run by a drive wheel that is rotationally driven by a hydraulic motor, electric motor, or other prime mover, and the cutting cable is not disposed between the drive wheel and the reinforced concrete structure. The direction of travel of the cutting cable can be freely changed by adjusting the angle of the rotating surface of the drive wheel or by installing pulleys at each bend. In addition, the running cutting cable is biased in the required direction so that it is always maintained at the required tension.
The tension can be maintained or adjusted, for example, by gradually moving the drive wheel, together with its attached equipment, rearward as cutting and disassembly progresses.

[Example] Hereinafter, the present invention will be specifically described based on the drawings. FIG. 1 is a perspective view illustrating an example of the method for cutting and dismantling a reinforced concrete structure according to the present invention. Supports 2 and 2a are temporarily installed in an immovable state by anchors or the like (not shown), and a cylindrical rack 3 with a gear is attached to these supports 2 and 2a, and the rotation angle around its axis can be adjusted. The rack 3 is mounted on a shaft in a fixed state, and a self-propelled platform 4 is mounted on the rack 3.
is fitted so as to be movable in the axial direction.

The self-propelled platform 4 includes a drive wheel 5, a hydraulic motor for rotationally driving the drive wheel, a drive wheel rotation mechanism 6 consisting of a continuously variable transmission, etc., a pinion 7 meshed with the rack 3, and a drive wheel rotation mechanism 6 for rotationally driving the drive wheel 5. A pinion rotation mechanism 8 consisting of a hydraulic motor and the like for the purpose of There is.
Furthermore, a cutting cable 1 is installed between the planned cutting start part on the surface of the reinforced concrete structure 1 and the driving forest 5.
1 are hung endlessly.

As illustrated in FIG. 2, which is an enlarged cross-sectional view, the cutting cable 11 is made of a steel wire 12 with a diameter of 5 mm, and a cylindrical bead 13 with an outer diameter of 10 mm and a length of 10 mm having a diamond grain surface layer. ~
They are inserted at a pitch of 30 mm, and a coil spring 14 is similarly inserted between each adjacent cylindrical bead 13, 13, so that it can be bent to a minimum diameter of 100 mm. Note that the beads 13 may be of ultra-hard material that can cut concrete layers containing reinforcing bars, concrete blocks, bricks, etc.
It may be made of ceramics other than diamond, and may be fixed to steel wire. In addition, an appropriate number of beads 1 are attached to the steel wire 12.
Each block of repeating coil springs 14 and 3 may be provided with a clip for restricting free movement between the blocks. Further, although the coil spring 14 is useful as a bendable spacer, in some cases, it may be replaced with a cylindrical sleeve as long as it does not inhibit the flexibility of the steel wire 12. It may be fixed and replaceable at the required pitch.

Next, the method for cutting and dismantling a reinforced concrete structure according to the present invention will be explained with reference to the drawings.

In the above configuration, the cutting cable 11 is
The driving wheel 5 is rotationally driven by the operation of the driving wheel rotation mechanism 6, so that the drive wheel 5 is rotated at a speed of, for example, 15 to 40 m/sec, and at the same time, the pinion 7 is rotationally driven by the operation of the pinion rotation mechanism 8. When the self-propelled platform 4 moves along the rack 3 and is constantly biased backward and pulled backward with a tension of, for example, 50 to 200 kg, the reinforced concrete structure 1, including the internal reinforcing bars, is completely cut and dismantled. Ru. In addition,
During the above-mentioned cutting and dismantling work, it is usually necessary to constantly inject water into the cut area for cooling, lubrication, cleaning, etc.

As described above, in the method of moving the self-propelled platform 4 along the rack 3, the self-propelled platform 4 may run out of control or break even immediately after cutting and dismantling the reinforced concrete structure 1 or when the cutting cable 11 suddenly breaks. It is safe because there is no risk of the cable 11 jumping.

In the above, the rotation surface of the drive wheel 5 is adjusted to be approximately horizontal, but the drive wheel 5 is adjusted to adjust the rotation angle around the axis of the rack 3 with respect to the supports 2, 2a, and to adjust the respective heights of the supports 2, 2a. By adjusting the height, it can be freely adjusted to the desired height and in the desired direction. For example, if the rack 3 is rotated 90 degrees in either direction around the axis from the state shown in FIG. 2 is adjusted to a position higher than the support 2a, the rotation surface of the drive wheel 5 is inclined upward in the direction of the reinforced concrete structure 1.

Furthermore, by arranging one or more pulleys at a required angle between the reinforced concrete structure 1 and the driving wheel 5, the winding angle of the cutting cable 11 around the driving wheel 5 can be adjusted, and the cutting cable 11 can be The cutting cable 11 can be freely bent and arranged at any length, the cutting cable 11 can be freely hung at a desired position on the reinforced concrete structure 1, and the relative positioning relationship between the reinforced concrete structure 1 and the drive wheel 5 can also be adjusted. It becomes possible to choose freely.

Therefore, as described above, by adjusting the height and inclination angle of the drive wheel 5 as necessary, or by arranging pulleys at various locations, the cutting cable 1 can be cut.
1 can be freely arranged and driven, so that not only the above-mentioned horizontal cutting of the reinforced concrete structure 1, but also slant cutting, vertical cutting at a required height, and other irregular cutting can be performed depending on the cutting thickness and cutting cross-sectional area. It is possible to cut and dismantle reinforced concrete structures 1 regardless of their size, and for example, when cutting and dismantling reinforced concrete structures 1 in narrow spaces where it is difficult to bring in cutting equipment, in dangerous high places such as the roof of a building, or in dangerous places along railroad tracks. , it is sufficient to bend the cutting cable 11 so that it can run. Furthermore, after the cutting cable 11 is installed between the reinforced concrete structure 1 and the drive wheel 5, the demolition worker remotely operates the hydraulic control box 10 at a location away from the cutting location or at a safe location. It can be operated and, in some cases, can be operated unmanned for long periods of time.

This method of cutting and dismantling the reinforced concrete structure 1 is applicable not only to cutting and dismantling for disposal, but also to moving and preserving the upper body of bridge girders, public toilets, houses, monuments, machine foundations, columns, etc. by cutting the lower part. Useful.

By sequentially repeating such cutting and dismantling method, it is possible to safely and reliably cut and dismantle the chimney and columnar reinforced concrete structure 1 from the top to the bottom. Traditionally, chimney removal work involves constructing scaffolding all around the chimney, and cutting the scaffolding from the top by hand using a blade-type cutting machine, or by attaching a hydraulic crusher to the tip of heavy machinery to destroy the scaffolding one by one. Demolition methods were widely known, but manual cutting is dangerous because the cutting speed is slow and the demolition worker must be close to the cutting site at all times.
In addition, when using a hydraulic crusher, there is a problem in terms of safety, as there is a lot of noise and vibration, and reinforced concrete debris is scattered and falls.

FIG. 3 is a perspective view illustrating another example of the method for cutting and dismantling a reinforced concrete structure according to the present invention. First, a cutting cable 11 is passed between the cutting end holes P and Q, and is hung endlessly around the drive wheel 5. Therefore, due to the traveling drive, the space between the cut end hole P and the cut end hole Q of the reinforced concrete structure 101 is completely cut, and there is no overcut as in the case of partial cutting due to the rotation of the disc-shaped blade. Not necessary. Next, by the same operation, adjust the height and inclination angle of the drive wheel 5 as necessary, or use vertical, horizontal pulleys, inclined pulleys, and other various pulleys to cut the cut end holes P, Q.
between the cut end holes R and S, and between the cut end holes S and P
A rectangular opening can be made in the reinforced concrete structure 101 by cutting also between the holes. In the case of such a cutting and dismantling method, it is only necessary to drill a hole at the cut end through which the cutting cable 11 passes, so it is possible to easily cut the reinforced concrete structure 101 with a thickness that would be impossible to cut with a conventional blade-type cutting machine. It can be cut and disassembled or opened.

Note that the running drive means and tension adjustment means for the cutting cable 11 are the same as those shown in FIG.
Detailed explanation and illustration will be omitted.

[Effects of the Invention] As described above, in the cutting and dismantling method for reinforced concrete structures according to the present invention, the cutting cable provided with ultra-hard beads is driven to cut and dismantle the reinforced concrete structures, so that the cutting and dismantling of the reinforced concrete structures is reduced. The rotational driving force and tensile force can be freely transmitted to the cutting cable like belt transmission or rope transmission, regardless of the length or bending mode of the cutting cable.

Therefore, this cutting and demolition method is suitable for cutting and demolition of various reinforced concrete structures in high and dangerous places such as chimneys and building roofs, dangerous places along railroad tracks, crowded areas and narrow spaces, etc.
Or, when partially cutting and dismantling a reinforced concrete structure to selectively cut and dismantle only the required parts without destroying other parts, including internal reinforcing bars, there are no restrictions on the cutting cross-sectional area or cutting thickness. Cutting and dismantling can be carried out at an extremely high cutting speed, with good workability, safely, and with minimal impact on the external environment such as vibration, noise, and dust.

Furthermore, since the rotation angle of the rack around its axis can be adjusted, the angle at which the cutting cable is wrapped around the drive wheel driven by the drive wheel of the self-propelled platform that fits into the rack can be adjusted, and the cutting cable can be connected to reinforced concrete structures. It becomes possible to hang it freely in the desired position.

As mentioned above, the inclination angle can be adjusted as necessary, so in addition to the above-mentioned horizontal cutting of reinforced concrete structures, inclined cutting, vertical cutting at the required height, and other irregular cutting can be performed depending on the cutting thickness and cutting angle. This is possible regardless of the size of the cross-sectional area.

Further, according to this cutting and demolition method, a polygonal opening can be bored in a reinforced concrete wall without overcutting.

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating an example of the method for cutting and dismantling a reinforced concrete structure according to the present invention, FIG. 2 is an enlarged cross-sectional view of an example of a cutting cable, and FIG. 3 is a cutting and dismantling method for a reinforced concrete structure according to the present invention. It is a perspective view explaining other examples of a construction method. (Explanation of main symbols), 1,101...Reinforced concrete structure, 2,2a...Support, 3...
Rack, 4... Self-propelled platform, 5... Drive wheel, 10...
Hydraulic control box, 11... Cutting cable, 1
2...Steel wire, 13...Beads.

Claims (1)

[Scope of Claims] 1. Drive of a self-propelled platform in which a cutting cable made of a wire with ultra-hard beads attached at appropriate pitches is wound around a reinforced concrete structure and fitted into a rack whose rotation angle around an axis can be adjusted. The cutting cable is driven to travel by adjusting the running speed and tension by the wheels, and the cutting cable is circulated while water is being poured, and the driving wheel is retreated to cut the cutting cable into the reinforced concrete structure. Cutting and demolition method for reinforced concrete structures. 2. A method for cutting and dismantling a reinforced concrete structure according to claim 1, which uses a cutting cable made by alternately inserting ultra-hard beads and cylindrical sleeves into a steel wire. 3. The method for cutting and dismantling a reinforced concrete structure according to claim 1 or 2, wherein the ultra-hard beads have a surface layer of diamond grains.