JPH0353427B2 - - 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 and equipment for subways, nuclear power plants, and other reinforced concrete structures.

[Prior Art] Conventionally, demolition methods and equipment for reinforced concrete structures include methods and equipment that utilize the expansion pressure of explosives and chemicals, gas pressure, and crushing using steel balls, vibrating hammers, and hydraulic pressure. Construction methods and devices, as well as methods and devices for cutting using disc-shaped blades and water jets using water pressure, are known.

[Problems to be Solved by the Invention] However, the above-mentioned methods and devices for destroying structures using explosives, etc., and methods and devices for crushing structures using steel balls, etc., are all suitable for completely dismantling the target structure, and are not conventional. Therefore, it can hardly be used for partial demolition of structures. In addition, these demolition methods and equipment can cause blast waves, vibrations, and
Due to the large impact noise, noise, dust, etc., there are severe restrictions on where and under what conditions it can be used.

On the other hand, construction methods and devices that cut by rotating a disk-shaped blade are suitable for partial demolition of structures, and are widely used for reinforcement, expansion, and renovation of structures as they age. However, because blade-type cutting machines are made smaller and lighter due to blade manufacturing and handling considerations, their cutting ability is inferior, the cutting cross-sectional area is limited to a narrow range, and the thickness that can be cut is only 30 to 40 cm. The degree is maximum. 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. Conventional construction methods and devices that drive the vehicle have problems with safety and workability.

In addition, cutting methods and equipment using water jets that utilize water pressure can be used for partial demolition of structures, but their cutting ability is significantly inferior and large mechanical equipment is required, and the cut surface spreads out in a radial manner. There were practical difficulties.

However, in wire saws, due to the positional relationship between the object to be cut and the wire drive device, the cutting wire runs along the required path through multiple guide pulleys between them, except in special cases. It is necessary to arrange it so that For example, when using a wire drive device on the ground to horizontally cut an object at a lower or higher location, the wire saw must run smoothly if there is no guide pulley between them. That is obviously impossible.

Conventionally, when cutting stone, the running direction of the wire saw has been appropriately changed by installing such guide pulleys at required locations.

However, when installing guide pulleys individually at required locations as in the past, it takes a lot of man-hours to install and dismantle the guide pulleys, and the positioning between each guide pulley to allow the cutting wire to run smoothly is difficult. It also required a lot of man-hours and skill to adjust the position and angle. Furthermore, in the conventional case, despite the arrangement of the plurality of pulleys, it was difficult to cut the object to be cut into accurate dimensions and angles, for example, accurately horizontally.

In addition, especially when using a wire saw for partial cutting work on reinforced concrete structures, unlike in a quarry, there is not enough ground and space to install many guide pulleys.
It is difficult to accurately cut the object to be cut at a predetermined height regardless of whether it is high or low, and it takes a considerable amount of time to install, dismantle, and adjust the guide pulley, which lengthens the cutting period. There were other problems.

Therefore, the first object of the present invention is to repair required parts of a reinforced concrete structure, including internal reinforcing bars,
It is possible to cut and dismantle at an extremely fast cutting speed without being limited by the cutting cross-sectional area or cutting thickness, with good workability and safety, and with minimal impact on the external environment such as vibration, noise, and dust. Our goal is to provide a possible demolition method and equipment.

A second object of the present invention is to provide a guide pulley mount for a wire saw that solves the problems of the prior art as described above.

[Means for Solving the Problem] The method for cutting and dismantling a reinforced concrete structure according to the present invention uses a movable guide pulley for guiding a wire, which is separately equipped with a wire saw made by attaching ultra-hard beads to a wire at an appropriate pitch. The invention is characterized in that the wire saw is driven to travel through the wire saw and cut into the reinforced concrete structure as the wire saw retreats while injecting water.

Further, the cutting and dismantling apparatus for reinforced concrete structures according to the present invention includes a self-propelled platform equipped with a drive wheel rotation mechanism for a wire saw, a rack and a pinion rotation mechanism for retracting the drive wheel as the wire saw retreats, and a wire wound around the wire. The present invention is characterized by comprising a guide pulley mount including a pair of horizontal pulleys for frictionally running the saw and a pair of vertical pulleys installed adjacent to the horizontal pulleys in a right angle direction, and a water injection device.

Furthermore, the guide pulley mount for a wire saw according to the present invention includes a pair of horizontal pulleys rotatably adjacent to each other in the same plane and pivotally connected to the guide pulley mount, and a pair of horizontal pulleys adjacent to each other at right angles to the horizontal pulleys and pivoted to the guide pulley mount. It is characterized by consisting of a pair of vertical pulleys pivotally connected to a pulley mount.

[Function] In the above, the wire saw is driven by a drive wheel that is rotationally driven by a hydraulic motor, an electric motor, or other prime mover, and the wire saw is installed between the drive wheel and the reinforced concrete structure, and the wire saw is Changes in direction of travel can be made freely by installing guide pulleys without changing the angle of the rotating surface of the drive wheels. In addition, the running wire saw is biased in a required direction so as to maintain a required tension at all times, and the tension is maintained or adjusted by, for example, cutting and disassembling the drive wheel together with its attached equipment. This can be done by gradually moving it backwards.

[Example] Hereinafter, the present invention will be specifically described based on the drawings. FIG. 1 is a perspective view of a self-propelled platform for explaining an example of the cutting and dismantling method for a reinforced concrete structure and its device according to the present invention. Two adjustable supports 2 and 2a are temporarily installed in an immovable state by anchors or the like (not shown), and a geared cylindrical rack 3 is attached to these supports 2 and 2a, with the axis of the rack as the center. A self-propelled platform 4 is fitted into the rack 3 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 wire saw 11 is provided between the planned cutting start part on the surface of the reinforced concrete structure 1 and the drive wheel 5.
are hung endlessly.

A frame (not shown) to which a pair of horizontal pulleys 15L, 15R and a pair of vertical pulleys 16L, 16R are pivoted is temporarily installed at the top of the chimney-shaped reinforced concrete structure 1, and a frame (not shown) is temporarily installed near the bottom of the reinforced concrete structure 1. A frame (not shown) on which a pair of vertical pulleys 17L and 17R are pivotally mounted is temporarily installed on the road surface.

As illustrated in FIG. 2, which is an enlarged cross-sectional view, the wire saw 11 includes a steel wire 12 having a diameter of 5 mm, and a cylindrical bead 13 having an outer diameter of 10 mm and a length of 10 mm having a surface layer of diamond grains. 30
The coil springs 14 are loosely fitted with a pitch of 10 mm, and a coil spring 14 is similarly loosely fitted between the adjacent cylindrical beads 13, 13, so that the coil springs 14 can be bent to a minimum diameter of 100 mm.
Note that the beads 13 may be made of ultra-hard material that can cut concrete layers containing reinforcing bars, concrete blocks, bricks, etc., and may be made of ceramic other than diamond, and may be fixed to a steel wire. Good too. Further, the steel wire 12 may be provided with a clip for each block consisting of a suitable number of repeating beads 13 and coil springs 14 to restrict free movement between the blocks. Further, the coil spring 14 is useful as a bendable spacer, but in some cases, it may be replaced with a cylindrical sleeve as long as it does not impede the flexibility of the steel wire 12, and only the beads 13 can be replaced with a steel wire. 12 so as to be replaceable at a 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 wire saw 11 is driven to rotate at a speed of 15 to 40 m/sec, for example, by rotationally driving the drive wheel 5 by the operation of the drive wheel rotation mechanism 6, and at the same time, the wire saw 11 is rotated by the pinion rotation mechanism. When the pinion 7 is rotated by the operation of the pinion 8 and the self-propelled platform 4 is moved along the rack 3, it is constantly biased backward and pulled backward with a tension of, for example, 50 to 200 kg. It will be completely cut and dismantled, including the reinforcing steel. Note that 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, even if the self-propelled platform 4 is moved out of control or the wire saw 11 is suddenly broken immediately after cutting and dismantling the reinforced concrete structure 1, It is safe because there is no danger of 11 jumping up and down.

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.

Thus, the wire saw 11 is wound horizontally around the part to be cut of the reinforced concrete structure 1, passes inside the horizontal pulleys 22a and 22b of the guide pulley frame 20, and passes through the vertical pulley 23.
a and 23b, and is bent around the drive wheel 5 in an endless manner. When the drive wheel 5 is rotated while moving the wire drive device away from the reinforced concrete structure 1, the wire saw 11 runs endlessly with the required tension and speed, and as a result, the reinforced concrete structure 1 can be horizontally cut. It will be started. Then, as the horizontal cutting of the reinforced concrete structure 1 progresses, the self-propelled platform 4 is moved along the rack 3, and the upper part of the reinforced concrete structure 1 is cut and dismantled in a substantially horizontal direction. Incidentally, since the traveling drive means and tension adjustment means of the wire saw 11 have been described above, detailed explanation and illustration thereof will be omitted.

In addition, the wire saw 11 is horizontally wound around the part to be cut of the reinforced concrete structure 1, and the horizontal pulley 22 of the guide pulley mount 20
a, 22b, and vertical pulleys 23a,
It may be bent via 23b and hung on the drive wheel 5 in an endless manner. Then, as described above, in the method of moving the self-propelled platform 4 along the rack 3, the wire saw 11 moves the horizontal pulleys 22a, 22 immediately after cutting and dismantling the reinforced concrete structure 1.
horizontal pulley 22a,
Unlike the case where the wire saw 11 passes inside the horizontal pulleys 22a and 22, the wire saw 11 passes through the horizontal pulleys 22a and 22.
It is safe because there is no danger of it slipping out of 2 and jumping.

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.

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

Therefore, this cutting and demolition method and equipment can be used 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. When partially cutting and dismantling a reinforced concrete structure, where only the required parts are selectively cut and dismantled without destroying other parts, there are no restrictions on the cutting cross-sectional area or cutting thickness, including the internal reinforcing bars. Cutting and demolition 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.

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

In particular, the guide pulley mount for a wire saw according to the present invention can smoothly guide the tension side and loose side of the wire saw at the same time and move it in the desired direction without requiring any special adjustment by simply installing it at the required location. It can be converted.

Therefore, in partial cutting work using a wire saw, especially in partial cutting work of reinforced concrete structures, the object to be cut can be accurately cut regardless of the height of the cut point, and the installation of the guide pulley can be done on the ground or in the space. It can also be suitably used in places where there is not enough space.

The above-mentioned cutting and demolition methods and equipment for reinforced concrete structures are not only used for cutting and demolition for disposal, but also for cutting bridge girders, underwater cutting, cutting of dams, buildings, etc.
It is also useful for moving and preserving the upper body of public toilets, houses, monuments, machine foundations, pillars, etc. by cutting the lower part.

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating an example of a method and apparatus for cutting and dismantling a reinforced concrete structure according to the present invention, and FIG. 2 is an enlarged cross-sectional view of an example of a wire saw. (Explanation of main symbols), 1...Reinforced concrete structure, 2, 2a...Support, 3...Rack,
4... Self-propelled platform, 5... Drive wheel, 10... Hydraulic control box, 11... Wire saw, 12... Steel wire, 13... Beads, 14... Coil spring, 20... Guide pulley mount.

Claims (1)

[Scope of Claims] 1. A wire saw comprising ultra-hard beads attached to a wire at an appropriate pitch is driven to run through a separately provided movable guide pulley for guiding the wire, and the wire is A method for cutting and dismantling a reinforced concrete structure, characterized by cutting into the reinforced concrete structure as the saw retreats. 2. A self-propelled stand equipped with a drive wheel rotation mechanism for the wire saw, a rack and pinion rotation mechanism for retracting the drive wheel as the wire saw retreats, a pair of horizontal pulleys for frictionally running the wire saw wound around the wire saw, and A cutting and dismantling device for a reinforced concrete structure, comprising a guide pulley mount including a horizontal pulley and a pair of vertical pulleys installed adjacent to each other at right angles, and a water injection device. 3. A pair of horizontal pulleys rotatably adjacent to each other in the same plane and pivotally connected to the guide pulley mount, and a pair of vertical pulleys adjacent to each other at right angles to the horizontal pulleys and pivotally connected to the guide pulley mount. A guide pulley mount for a wire saw, characterized by comprising: