JPH05256031A - Cutting and demolishing device for reinforced concrete structure - Google Patents

Abstract

PURPOSE:To effectively cut off only desired positions of a reinforced concrete structure as well as make the maintenance and adjustment of wire-saw tension easier by a method in which a pair of horizontal and vertical pulleys by which a wire saw having a superhard cylindrical bead is engaged with an object to be cut and operated is provided, and a wire saw-driving wheel is mounted on a mobile base. CONSTITUTION:A wire saw 11 having a cylindrical bead with diamond particle surface layers is operated by a driving wheel 5 mounted on a mobile (forth and backward) base 4. Also, a pair of horizontal pulleys 15R and 15L and a pair of vertical pulleys 16R and 16L are provided near an object 1 to be cut, and the wire saw 11 is wound around the object 1 and operated. While changing the position of the wheel 5, the tension of the wire saw 11 is maintained and adjusted to cut and demolish reinforced concrete structures such as building, chimney, bridge base, and others without emission of vibration, noise, and dust. Only desired positions of the structure can thus be effectively and selectively cut and demolished.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cutting and dismantling buildings, bridges, foundations, large plants, subways, nuclear power plants and other reinforced concrete structures. 2. Description of the Related Art Conventionally, as a dismantling device for a reinforced concrete structure, a device for destroying explosives or chemicals by utilizing expansion pressure or gas pressure, a steel ball, a vibration hammer, or a device for crushing by hydraulic pressure, Further, a disc-shaped blade and a device for cutting with a water jet utilizing water pressure are known. However, the above-mentioned device for destroying explosives and the like and device for crushing by steel balls and the like are both suitable for completely dismantling the target structure, and therefore the structure. It can hardly be used for the partially decomposed product. Further, in these dismantling devices, the places where they are used and the conditions under which they are used are severely restricted because the surrounding environment is greatly affected by blast, vibration, impact noise, noise, dust, and the like. On the other hand, a device for cutting by rotating a disc-shaped blade is suitable for a partially disassembled structure of a structure, and is widely used for work such as reinforcement and extension / reconstruction due to aging of the structure. However, the blade type cutting machine is inferior in cutting ability because it is small and lightweight due to the convenience of blade manufacturing and handling, the cutting cross-sectional area is limited to a narrow range, and the cuttable thickness is 30 to 40 cm. The degree is maximum.
Further, in the case of such partial cutting by rotation of the disk-shaped blade, there is a problem that an unnecessary cutting point needs to be overcut, and further, a blade type cutting machine can be installed along the guide rail attached to the wall surface to be cut. The conventional device for driving the vehicle has problems in safety and workability. An apparatus for cutting with a water jet utilizing water pressure can also be used for the partially decomposed body of the structure, but the cutting ability is remarkably inferior, large mechanical equipment is required, and the cutting surface spreads radially. There was a practical difficulty. However, in the wire saw, due to the positional relationship between the object to be cut and the wire drive device, except for a special case, the cutting wire runs between them through a plurality of guide pulleys. It must be arranged so that it runs on the road. For example, when a ground wire driving device is used to horizontally cut an object to be cut that is located at a lower or higher position, it is not possible to smoothly run the wire saw unless a guide pulley is interposed between them. Obviously impossible. Conventionally, when cutting out stone materials, such guide pulleys have been individually installed at required locations to appropriately change the traveling direction of the wire saw. However, in the case where the guide pulleys are individually installed at the required places as in the prior art, a lot of man-hours are required for the installation and the dismantling itself, and the guide pulleys for smoothly running the cutting wire. A lot of man-hours and skill are required to adjust the position and angle between them. Further, in the conventional case, despite the arrangement of the plurality of pulleys,
It has been difficult to cut an object to be cut into accurate dimensions and angles, for example, accurately horizontally. Further, especially when the wire saw is used for the partial cutting work of the reinforced concrete structure, unlike the quarry, there is not enough space on the ground and space for installing many guide pulleys. It is difficult to accurately cut the body at a predetermined height regardless of whether it is high or low, and it takes a considerable amount of time to install, disassemble, adjust, etc. the guide pulley, so the cutting work will take longer. There was a problem. Therefore, the object of the present invention is not limited by the cutting cross-sectional area and cutting thickness of the required parts of the reinforced concrete structure, including the internal reinforcing bars, and at an extremely high cutting speed, with good workability and safety. Another object of the present invention is to provide a dismantling device capable of cutting and dismantling in a state where vibration, noise, dust, etc., have an extremely small effect on the external environment. A cutting and disassembling apparatus for a reinforced concrete structure according to the present invention is a drive wheel rotating mechanism for driving a wire saw provided with super-hard beads and a cylindrical sleeve, and the wire saw. A self-propelled table equipped with a rack and pinion rotation mechanism that retracts the drive wheels as the vehicle retreats, a pair of horizontal pulleys that frictionally travels the wound wire saw, and a vertical pulley that is adjacent to the horizontal pulleys and is installed in a perpendicular direction. It is characterized by being configured with a guide pulley mount provided. The wire saw guide pulley mount according to the present invention further comprises a pair of horizontal pulleys rotatably adjacent to each other in the same plane and pivotally attached to the guide pulley mount, and adjacent to each other at right angles to the horizontal pulleys. And a pair of vertical pulleys pivotally attached to the guide pulley base. In the above, the wire saw is driven and driven by drive wheels that are rotationally driven by a hydraulic motor, an electric motor, or another prime mover, and when cutting the reinforced concrete structure, when the wire saw travels, ultra-hard beads are generated. Cylindrical sleeves ensure the cutting of reinforced concrete structures without significant movement relative to the wire.
Moreover, the arrangement of the wire saw between the drive wheel and the reinforced concrete structure, the change of the traveling direction of the wire saw, and the like can be freely performed by installing the guide pulley without changing the angle of the rotation surface of the drive wheel. Further, the traveling wire saw is urged in a required direction so as to be constantly held at a required tension, and the tension is maintained or adjusted along with the progress of cutting and disassembling, for example, the drive wheels together with their accessory devices. This can be done by gradually moving to the rear. The present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view of a self-propelled table for explaining an example of a cutting and dismantling method of a reinforced concrete structure and an apparatus therefor according to the present invention. In FIG. 1, height adjustment is performed on a road surface in front of a columnar reinforced concrete structure 1. The two supports 2 and 2a capable of moving are temporarily installed in an immovable state by anchors or the like (not shown), and the columnar rack 3 with gears is attached to the supports 2 and 2a, and the rotation angle about the axis thereof. A rack is fixedly mounted on the rack 3, and a self-propelled table 4 is fitted in the rack 3 so as to be movable in the axial direction. On the self-propelled table 4, a drive wheel 5, a hydraulic motor for rotating the drive wheel, a drive wheel rotating mechanism 6 including a continuously variable transmission, a pinion 7 meshed with the rack 3 and the like. A pinion rotating mechanism 8 including a hydraulic motor for rotating and driving the vehicle is mounted. Further, a hydraulic control box 10 is mounted on the drive wheel rotating mechanism 6 and the pinion rotating mechanism 8 via a flexible hydraulic hose 9. It is connected. Further, a wire saw 11 is provided between the drive start wheel 5 and the planned cutting start portion on the surface of the reinforced concrete structure 1.
Is hung endlessly. A pedestal (not shown) on which a pair of horizontal pulleys 15L and 15R and a pair of vertical pulleys 16L and 16R are pivotally mounted is temporarily installed above the chimney-shaped reinforced concrete structure 1. On a road surface near the lower part, a pedestal (not shown) on which a pair of vertical pulleys 17L and 17R is pivotally mounted is temporarily installed. The wire saw 11 has an outer shape 10 having a diamond grain surface layer on a steel wire 12 having a diameter of 5 mm, as illustrated in FIG.
20 to 3 mm cylindrical beads 13 with a length of 10 mm
Cylindrical beads 1 that are loosely fitted with 0 mm pitch and are adjacent to each other
Similarly, the coil spring 14 is loosely fitted between 3 and 13,
It is bendable with a minimum diameter of 100 mm. The beads 13 need only be ultra-hard ones capable of cutting concrete layers including reinforcing bars, concrete blocks, bricks, etc., and may use ceramics other than diamond. You may fix it. Also, steel wire 12
For each block formed by repeating a proper number of beads 13 and coil springs 14, a clip may be attached to limit free movement between the blocks. Although the coil spring 14 is useful as a bendable spacer, it may be replaced with a cylindrical sleeve within a range that does not impair the bendability of the steel wire 12 in some cases. Alternatively, the beads 13 may be fixed to the steel wire 12 in a replaceable manner at a required pitch. Next, a method for cutting and dismantling the reinforced concrete structure of the present invention will be described with reference to the drawings. In the above structure, the wire saw 11
Is driven to rotate by driving the drive wheel rotating mechanism 6 so as to circulate at a speed of, for example, 15 to 40 m / sec, and at the same time, the pinion rotating mechanism is driven.
When the pinion 7 is rotationally driven by the operation of 8 and the self-propelled table 4 is moved along the rack 3 accordingly, the pin is constantly biased rearward, and when the rearward is pulled by a tension of 50 to 200 kg, for example, the reinforced concrete structure 1 becomes It is completely cut and disassembled, including. In the above-mentioned cutting and disassembling work, it is usually necessary to constantly pour water into the cutting site for cooling, lubrication, cleaning and the like. As described above, in the method of moving the self-propelled table 4 along the rack 3, the self-propelled table 4 may run out of control immediately after cutting and demolition of the reinforced concrete structure 1 or when the wire saw 11 is suddenly broken. It is safe because there is no risk of the wire saw 11 jumping. Although the rotation surface of the drive wheel 5 is adjusted to be substantially horizontal in the above description, the drive wheel 5 adjusts the rotation angle of the rack 3 with respect to the support 2, 2a and the support 2, 2a. By adjusting the respective heights, it is possible to freely adjust the heights to desired heights and directions.
For example, if the rack 3 is fixed to the supports 2 and 2a by rotating the rack 3 around the axis by 90 degrees in any direction from the state shown in FIG. 1, the rotation surface of the drive wheels 5 becomes vertical, and the support 2 in FIG. When adjusted to a position higher than the support 2a, the rotation surface of the drive wheel 5 inclines upward in the direction of the reinforced concrete structure 1. Therefore, the wire saw 11 is horizontally wound around the cut portion of the reinforced concrete structure 1 and the horizontal pulleys 15L, 15L of the guide pulley frame.
It passes through the inside of R, bends via the vertical pulleys 16L and 16R, and is endlessly hung on the drive wheel 5. When the drive wheel 5 is rotated while moving the wire drive device toward the reinforced concrete structure 1 here, the wire saw 1
1 runs endlessly at the required tension and speed, resulting in the initiation of horizontal cutting of the reinforced concrete structure 1. Then, as the horizontal cutting of the reinforced concrete structure 1 progresses, the self-propelled table 4 is moved along the rack 3, and the upper part of the reinforced concrete structure 1 is cut and disassembled in a substantially horizontal direction. Since the traveling drive means and the tension adjusting means of the wire saw 11 have been described above, detailed description and illustration thereof will be omitted. Further, the wire saw 11 is horizontally wound around the cut portion of the reinforced concrete structure 1, passes outside the horizontal pulleys 15L, 15R of the guide pulley mount, and bends via the vertical pulleys 16L, 16R. It may be endlessly hung on the drive wheel 5. Then,
As described above, in the method of moving the self-propelled table 4 along the rack 3, the wire saw 11 is provided with the horizontal pulleys 15L, 15 immediately after the cutting and dismantling of the reinforced concrete structure 1.
Since it is supported by R, the horizontal pulleys 15L, 15
Unlike the case where the wire saw 11 passes through the inside of R, there is no risk that the wire saw 11 will slip out of the horizontal pulleys 15L, 15R and jump, which is safe. By repeating such a cutting and dismantling method in sequence, it is possible to safely and surely dismantle the chimney and the columnar reinforced concrete structure 1 from the upper part to the lower part. As described above, in the apparatus for cutting and dismantling a reinforced concrete structure according to the present invention, the wire saw having the super-hard beads and the cylindrical sleeve attached thereto is driven to travel to dismantle the reinforced concrete structure. Therefore, the rotational driving force and the pulling force from the driving wheels can be freely transmitted to the wire saw like belt transmission or rope transmission regardless of the length and bending mode of the wire saw, and at the same time, the ultra-hard beads and the cylinder can be transmitted. Since the sleeve does not move much with respect to the wire, the reinforced concrete structure can be cut with good workability and safety. Therefore, in this cutting and dismantling device, for example, the dismantling and dismantling of various reinforced concrete structures in a high dangerous place such as a chimney or a rooftop of a building, a dangerous place along a railway track, a dense place or a narrow place, or When selectively cutting and dismantling only the required parts without destroying other parts, such as partial cutting and dismantling of reinforced concrete structures, including internal reinforcing bars, without being restricted by the cutting cross-sectional area or cutting thickness, It is possible to carry out cutting and dismantling at an extremely high cutting speed, with good workability and safety, and in a state where the influence on the external environment such as vibration, noise and dust is extremely small. Further, according to this cutting and disassembling apparatus, polygonal openings can be bored in the reinforced concrete wall without overcutting. Particularly, in the wire saw guide pulley mount according to the present invention, the wire saw guide pulley can be smoothly installed simultaneously at a required position without any special adjustment, and the wire saw tension side and the loose side can be smoothly guided. Can be changed to the direction of. Therefore, in the partial cutting work with a wire saw, especially in the partial cutting work of reinforced concrete structures, it is possible to accurately cut the object to be cut regardless of the height of the cutting point, and to install the guide pulley on the ground and in the space. It can be suitably used even in a place where sufficient space cannot be secured. The above-mentioned cutting and dismantling device for reinforced concrete structures is not only for cutting and dismantling for disposal, but also for bridge girders, underwater cutting, dam, building cutting, public toilets, houses, monuments, machine foundations, pillars, etc. It is also useful for moving and storing the upper body by cutting the lower part.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view illustrating an example of a cutting and disassembling apparatus for a reinforced concrete structure according to the present invention. FIG. 2 is an enlarged cross-sectional view of an example of a wire saw. [Explanation of reference numerals] 1 reinforced concrete structure 2 support 2a support 3 rack 4 self-propelled table 5 drive wheel 6 drive wheel rotating mechanism 7 pinion 8 pinion rotating mechanism 9 hydraulic hose 10 hydraulic control box 11 wire saw 12 steel wire 13 beads 14 coil spring 15L horizontal pulley 15R horizontal pulley 16L vertical pulley 15R vertical pulley

Claims (1)

(1) A drive wheel rotating mechanism for a wire saw having a super-hard bead and a cylindrical sleeve, and a rack and pinion rotating mechanism for retracting the drive wheel as the wire saw retracts. Cutting a reinforced concrete structure composed of a self-propelled stand equipped with the guide pulley mount having a pair of horizontal pulleys for frictionally running a wound wire saw, and a vertical pulley adjacent to the horizontal pulleys and installed vertically at right angles. Dismantling device. (2) A pair of horizontal pulleys rotatably adjacent to each other in the same plane and pivotally attached to the guide pulley mount, and a pair of vertical pulleys pivotally attached to the guide pulley mount adjacent to each other at right angles to the horizontal pulley. A cutting and disassembling device for a reinforced concrete structure according to claim 1, characterized by comprising a pulley.