JP6894194B2 - Cutting device and dismantling device - Google Patents

Description

The present invention relates to a cutting device and a dismantling device suitable for cutting a concrete structural member when dismantling a reinforced concrete structure or a steel-framed reinforced concrete structure.

Dismantling of concrete structural members such as mat slabs, pressure plates, and large underground beams used in reinforced concrete structures (hereinafter referred to as RC structures) and steel-framed reinforced concrete structures (hereinafter referred to as SRC structures). In some cases, a crusher-based demolition method may be adopted. However, in the conventional destructive method using a crusher, when the width of the object to be dismantled becomes wide, it takes a long time to work, and there is a situation that vibration, dust, and noise are generated due to the use of a breaker, etc. There was a need for another dismantling method to replace the machine-based destruction method.

As one of the methods for cutting and dismantling large concrete structural members used for RC and SRC structures in response to the above situation, the cool cut method (registered trademark) or the cool using a push-cut wire saw is used. Cutting devices used in the cutting method have been proposed (see, for example, Patent Documents 1 and 2).

In Patent Document 1, a wire saw is provided between a base plate supported by the tip of an arm of a base machine and provided with a reaction force receiving device, a propulsion pulley that is rotationally driven by a drive source provided on the base plate, and another pulley. Cutting a concrete structure including a wire saw unit hung in an endless loop shape and a propulsion pulley driving means capable of moving the propulsion pulley of the pulleys of the wire saw unit in the push-cutting direction of the object to be cut by the wire saw. The device (cutting device) is disclosed. In the cutting device described in Patent Document 1, a part of the wire saw whose propulsion pulley is held at one end and a part of the reaction force receiving device are brought into contact with the object to be cut by operating the arm of the base machine. Position the base plate. Then, the wire saw is guided by each pulley to rotate by driving the propulsion pulley, and the propulsion pulley is directly moved in the push-cutting direction of the object to be cut by the propulsion pulley driving means, so that the cutting held by the reaction force receiving device is performed. Cut the object.

Further, in Patent Document 2, a wire in which an endless loop-shaped wire saw is wound around a propulsion pulley and a series of guide pulleys and pressed against the object to be cut while being circulated and driven to cut the object to be cut by a push-off operation. A cutting device having a saw mechanism, in which a wire saw mechanism is attached to the tip of a swing arm of a base machine and the wire saw mechanism is arranged at a cutting work position by operating the swing arm to perform cutting work is disclosed. There is. In the cutting device described in Patent Document 2, the wire saw mechanism is installed in which the entire propulsion pulley and a series of guide pulleys are supported by the base frame. Further, the base frame is attached to the tip of the swing arm via the guide frame, and the base frame is supported by the first advance / retreat drive mechanism so as to be able to advance / retreat with respect to the guide frame. Further, among the guide pulleys in the wire saw mechanism, at least one or both of the pair of guide pulleys arranged on both sides of the object to be cut and pressing the wire saw against the object to be cut are moved in and out of the second position. It is configured as a propulsion pulley that can move forward and backward with respect to the base frame by the drive mechanism.

Japanese Patent No. 5725346 Japanese Unexamined Patent Publication No. 2014-69529

However, in the cutting device described in Patent Documents 1 and 2, when used as a push-cut wire saw, a wide concrete structural member or a deep concrete that exceeds the limit of the distance between the propulsion pulleys that advance and retreat in the push-cut direction of the object to be cut. There was a problem that it could not be used for structural members. Further, in the same cutting device, when used as a pull-cut wire saw, it is necessary to hang a wire on the concrete structural member so as to surround the outer peripheral surface of the concrete structural member. There was a problem that it was practically impossible to perform such work.

When the conventional cutting device is used as a push-cut wire saw, the present inventor has a relationship between the material and tension of the wire, the reaction force from the object to be cut, etc., when the distance between the propulsion pulleys, which are the fulcrums of the reaction force, becomes significantly long. Attention was paid to the fact that the cutting performance as a wire saw is lost or the wire saw becomes inoperable because the wire becomes easily bent. Therefore, a propulsion relay pulley is provided between the propulsion pulleys, a wire is hung between the propulsion pulley and the propulsion relay pulley, and the wire length between the pulleys is suppressed to the extent that the tension of the wire is maintained in a good state. It was found that the cutting performance of the wire saw is exhibited well. Further, the present inventor has found that the wire saw can be advanced downward at any time by forming a core hole extending in the vertical direction with respect to the concrete structural member and passing a relay pulley through the core hole. It came to be completed. By making it possible to advance the wire saw downward at any time, it is not necessary to use the cutting device as a pulling wire saw, and the above-mentioned problem does not occur.

That is, the present invention has been made in view of the above circumstances, and provides a cutting device and a dismantling device capable of easily cutting a larger concrete structural member.

According to the above configuration, core holes are provided at predetermined intervals in the width direction of the object to be cut, and the pair of propulsion pulleys and the relay pulley are respectively driven by the pulley propulsion unit while the wire saw is circulated and driven by the wire saw drive unit. By propelling the object to be cut in a direction away from each other and passing the relay pulley through the core hole of the object to be cut, the tension of the wire saw wound around the lower part of the pair of propulsion pulleys is maintained, and the tension of the wire saw is maintained. Good cutting performance. As a result, it is not necessary to hang a wire on the concrete structural member so as to surround the outer peripheral surface of the object to be cut, and the wire saw can be propelled downward at any time, and even if the object to be cut is a large concrete structural member, it is easy. It becomes possible to cut off by pushing.

In the cutting device according to the present invention, a pair of propulsion pulleys arranged at intervals wider than the width dimension of the concrete structural member and a pair of propulsion pulleys arranged between the pair of propulsion pulleys and in the width direction and height of the concrete structural member. a relay pulley provided two by shifting the position in the depth direction orthogonal to the direction, between one of the propulsion pulley and one of the relay pulleys, and the other of said propulsion pulley and the other of the relay pulley The wire saw wound between them, the wire saw driving unit that circulates and drives the wire saw, and the pair of propulsion pulleys and the relay pulley are independently propelled in a direction that is close to and separated from the concrete structural member. It is equipped with a pulley propulsion unit.

According to the above configuration, core holes are provided at predetermined intervals in the width direction of the object to be cut, and the wire saw is circulated and driven by the wire saw driving unit, and relayed to one or the other of the pair of propulsion pulleys by the pulley propulsion unit. By propelling the pulleys in directions that are close to each other with respect to the object to be cut and passing the relay pulley through the core hole of the object to be cut, between one propulsion pulley and one relay pulley, and the other propulsion pulley. The tension of the wire saw wound between the wire saw and the other relay pulley is maintained, and the cutting performance of the wire saw is exhibited well. As a result, as with the cutting device described above, it is not necessary to hang the wire on the concrete structural member, and the wire saw can be propelled downward at any time, and even if the object to be cut is a large concrete structural member, it can be easily pushed out. It becomes possible to disconnect.

In the above-mentioned cutting device, it is preferable that two or more sets of the relay pulleys arranged by shifting the positions of the concrete structural member in the depth direction are provided.

According to the above configuration, even when the width dimension of the object to be cut is larger and the distance between the pair of propulsion pulleys is wider, two or more sets of relay pulleys are provided in the width direction of the object to be cut. The distance around which the wire saw is wound is moderately suppressed, and the tension of the wire saw is well maintained.

The dismantling device according to claim 4 is characterized in that the cutting device according to any one of claims 1 to 3 is attached to the tip end portion of the swing arm.

According to the above configuration, the entire cutting device can be moved according to the position and arrangement of the object to be cut by using the swing arm.

According to the cutting device and the dismantling device of the present invention, even a wide concrete structural member can be easily cut.

It is a partial cross-sectional view which looked at the main part of the cutting apparatus of 1st Embodiment to which this invention was applied from the side. It is a figure for demonstrating the method of cutting a concrete structural member by using the cutting apparatus shown in FIG. 1, and (a) is a partial cross-sectional view of how one of a relay pulley and a propulsion pulley is lowered as seen from the side. (B) is a partial cross-sectional view of the state in which the other side of the propulsion pulley is lowered, and (c) is a partial cross-sectional view of the state in which the relay pulley and the propulsion pulley are lowered as viewed from the side. Is. It is a partial cross-sectional view which looked at the main part of the cutting apparatus of the 2nd Embodiment to which this invention was applied from the side. It is a partial cross-sectional view which looked at the main part of the cutting apparatus of the 2nd Embodiment to which this invention was applied from above.

Hereinafter, embodiments of a cutting device and a disassembling device to which the present invention is applied will be described with reference to the drawings. The drawings used in the following description are schematic, and the length, width, thickness ratio, etc. are not always the same as the actual ones and can be changed as appropriate.

The cutting device of the embodiment to which the present invention is applied and the dismantling device provided with the cutting device have a width dimension and a depth exceeding 1300 mm, for example, such as a mat slab provided on an underground surface and a large underground beam. It is a device for cutting a concrete structural member (object to be cut) C having.
The cutting device is attached to the tip of a swing arm (not shown) of the base machine of the dismantling device. The cutting device is configured so that it can be arranged at the cutting work position by operating the swing arm of the dismantling device. The base machine is not particularly limited, and various heavy machines can be adopted as long as it is equipped with a swing arm, but a general-purpose hydraulic excavator is particularly suitable.

A guide frame 3 (see FIG. 1) is provided at the tip of the above-mentioned swing arm in the dismantling device via a bracket or the like. The guide frame 3 is configured so as to be close to and separated from the concrete structural member C, and when the cutting device 4 is arranged at the cutting work position, the guide frame 3 comes into contact with the surface on which the concrete structural member C starts to be cut. ing.

(First Embodiment)
As shown in FIG. 1, the cutting device 4A of the first embodiment includes a pair of propulsion pulleys 7A and 7B and a pair of propulsion pulleys 7A and 7B arranged at intervals wider than the width dimension W of the object to be cut. A relay pulley 20 arranged between them, a wire saw 5 wound from one propulsion pulley 7A to the other propulsion pulley 7B via the relay pulley 20, and a wire saw driving unit 6 for circulatingly driving the wire saw 5. A pulley propulsion unit 11 for independently propelling the pair of propulsion pulleys 7A and 7B and the relay pulley 20 in the height direction of the concrete structural member (object to be cut) C is provided.
The concrete structural member C is provided on the underground surface G.

Although the main part of the cutting device 4A is shown in FIG. 1, the propulsion pulleys 7A and 7B, the relay pulley 20 and the wire saw drive unit 6 are placed on a three-sided frame substantially along the circulation trajectory of the wire saw 5 as a whole. Have been placed.

In the first embodiment, the wire saw 5 has an endless loop shape, and is wound around propulsion pulleys 7A and 7B, a relay pulley 20, and pulleys having various functions. By driving the wire saw driving unit 6, the wire saw 5 is circulated and driven. As the wire saw drive unit 6, for example, a drive pulley that can be rotationally driven by using a motor can be adopted. The wire saw 5 is also wound around the wire saw drive unit 6 and the pulleys 16 arranged between the wire saw drive unit 6 and the propulsion pulleys 7A and 7B.

The pulley propulsion unit 11 includes an electric cylinder 9A connected to the propulsion pulley 7A, an electric cylinder 9B connected to the propulsion pulley 7B, and an electric cylinder 10 connected to the relay pulley 20. The configuration and arrangement of the pulley propulsion unit 11 is not particularly limited as long as the pair of propulsion pulleys 7A and 7B and the relay pulley 20 can be individually moved in at least the vertical direction D3 or the opposite direction. Examples of the pulley propulsion unit 11 include, in addition to the electric hydraulic or pneumatic cylinder mechanism, various hydraulic motors, a feed screw mechanism using an actuator as a drive source, a rack and pinion mechanism, a chain, and the like. Further, from the viewpoint of stable support by contacting the surface of the concrete structural member C on the side where cutting is started, it is preferable that the pulley propulsion portion 11 is provided in the guide frame 3.

When cutting the concrete structural member C using the cutting device 4A and the dismantling device provided with the cutting device 4A, first, the core hole is formed in the width direction of the concrete structural member C (that is, the width direction D1 shown in FIG. 1). Form H.
After that, the cutting device 4A is arranged on the base end side (swing arm side) of the guide frame 3 by operating the swing arm of the dismantling device, and the tip of the guide frame 3 is brought into contact with the concrete structural member C to bring the wire saw. Place 5 at the cutting start position. At this time, the position of the relay pulley 20 is aligned with the core hole H of the concrete structural member C.

Next, the wire saw drive unit 6 starts the rotary drive of the wire saw 5, and the electric cylinder 10 of the pulley propulsion unit 11 first lowers the relay pulley 20 as shown in FIG. 2A, and the core hole H Insert inside. When the relay pulley 20 is advanced to a predetermined depth while maintaining the tension of the wire saw 5, the propulsion pulley 7B is moved slightly above the relay pulley 20 by the electric cylinder 9B of the pulley propulsion unit 11.
In FIGS. 2 (a), 2 (b), and 2 (c), the wire saw drive unit 6 and the pulley propulsion unit 11 are not shown.

Subsequently, the electric cylinder 9A of the pulley propulsion unit 11 moves the propulsion pulley 7A to substantially the same height as the propulsion pulley 7B (that is, slightly above the relay pulley 20) as shown in FIGS. Let me. From the viewpoint of maintaining the tension of the wire saw 5 and preventing the wire saw 5 from loosening due to the reaction force from the concrete structural member C, the relay pulley 20 is propelled before the propulsion pulleys 7A and 7B after the start of cutting. Moreover, it is preferable that the relay pulley 20 is located below the propulsion pulleys 7A and 7B, and if so, the propulsion pulleys 7A and 7B may be propelled at the same time regardless of the propulsion order.

As described above, the lowering of the relay pulley 20 and the lowering of the propulsion pulleys 7A and 7B are repeated in sequence, and the relay pulley 20 and the propulsion pulleys 7A and 7B are passed through the core hole H and the concrete structural member C in the width direction D1 side, respectively. As a result, the concrete structural member C is pushed and cut.

As described above, according to the cutting device 4A of the first embodiment, core holes H are provided at predetermined intervals in the width direction D1 of the concrete structural member C, and the wire saw 5 is circulated and driven by the wire saw driving unit 6. However, the relay pulley 20 is passed through the core hole H of the concrete structural member C by the pulley propulsion unit 11, and the propulsion pulleys 7A and 7B and the relay pulley 20 are placed below the propulsion pulleys 7A and 7B. Can be propelled in the height direction (that is, the vertical direction D3) of the concrete structural member C, respectively. As a result, the wire saw 5 wound around the lower portions of the propulsion pulleys 7A and 7B can be relayed by the relay pulley 20, and the tension of the wire saw 5 can be held satisfactorily and surely. Therefore, the cutting performance of the wire saw 5 can be satisfactorily exhibited, the wire saw 5 can be propelled in the vertical direction D3 at any time, and the wire saw 5 is hung on the concrete structural member C so as to surround the outer peripheral surface of the concrete structural member C. There is no need, and the large concrete structural member C can be easily pushed and cut.

(Second Embodiment)
Next, the cutting device 4B of the second embodiment to which the present invention is applied will be described with reference to FIG. In the components of the cutting device 4B shown in FIG. 3, the same components as those of the cutting device 4A described above are designated by the same reference numerals, and the description thereof will be omitted.

In the cutting device 4B of the second embodiment, the relay pulley 20 is arranged between the pair of propulsion pulleys 7A and 7B, and is located in the depth direction (direction orthogonal to the width direction of the object to be cut) D2 of the concrete structural member C. It is composed of two relay pulleys 20X and 20Y provided by shifting the positions. In FIG. 3, in order to show the two relay pulleys 20X and 20Y in an easy-to-understand manner, the positions of the relay pulleys 20X and 20Y are displaced from each other in the width direction D1 of the concrete structural member C. The positions of the relay pulleys 20X and 20Y overlap in the depth direction D2 of the structural member C. In order to show the positions of the relay pulleys 20X and 20Y in the depth direction D2 in an easy-to-understand manner, the wire saw drive unit 6 and the pulley propulsion unit 11 are not shown in FIG.

Further, in the cutting device 4B of the second embodiment, the wire saw 5 is composed of two wire saws 5A and 5B in the width direction D1 of the concrete structural member C. As shown in FIG. 3, in the cutting device 4B of the second embodiment, the wire saw drive unit 6 is individually provided for the two wire saws 5A and 5B, and is composed of the drive pulleys 6A and 6B. The wire saw 5A has an endless loop shape and is wound between the propulsion pulley 7A, the relay pulley 20X, the drive pulley 6A, and the pulley 16. The wire saw 5B also has an endless loop shape and is wound between the relay pulley 20Y, the propulsion pulley 7B, the drive pulley 6B, and the pulley 16. The wire saw driving unit 6 may be provided as a single unit capable of independently driving the two wire saws 5A and 5B.

Further, in the cutting device 4B of the second embodiment, the pulley propulsion unit 11 is an electric cylinder 9A connected to the propulsion pulley 7A, an electric cylinder 10X connected to the relay pulley 20X, and an electric cylinder connected to the relay pulley 20Y. It is composed of a cylinder 10Y and an electric cylinder 9B connected to the propulsion pulley 7B. The pulley propulsion unit 11 may be provided as a single unit capable of independently propelling two sets of pulleys.

When cutting the concrete structural member C using the cutting device 4B and the dismantling device provided with the cutting device 4B, the concrete by the cutting device 4A is used until the position of the relay pulley 20 is aligned with the core hole H of the concrete structural member C. The same process as when cutting the structural member C is performed.
After that, the two wire saws 5A and 5B are rotationally driven, respectively, and the pulleys of each set of the propulsion pulley 7A and the relay pulley 20X and the relay pulley 20Y and the propulsion pulley 7B are lowered as appropriate. The relay pulleys 20X and 20Y are inserted into the core hole H.

As described above, the pulleys of each set are lowered, and the propulsion pulleys 7A and 7B and the relay pulleys 20X and 20Y are passed through the width direction D1 side of the concrete structural member C and the core hole H, respectively, so that the concrete structural member C is pushed and cut.

As described above, according to the cutting device 4B of the second embodiment, core holes H are provided at predetermined intervals in the width direction D1 of the concrete structural member C, and the wire saws 5A and 5B are respectively provided by the wire saw driving unit 6. While being circulated and driven, the relay pulleys 20X and 20Y are passed through the core hole H of the concrete structural member C by the pulley propulsion unit 11, and the pulleys of each set of the propulsion pulley 7A and the relay pulley 20X and the relay pulley 20Y and the propulsion pulley 7B are passed. Can be propelled in the height direction (that is, the vertical direction D3) of the concrete structural member C, respectively. As a result, the tension of the wire saws 5A and 5B wound around the pulleys of each set can be held satisfactorily and reliably. Therefore, the cutting performance of the wire saws 5A and 5B can be satisfactorily exhibited, the wire saws 5A and 5B can be propelled in the vertical direction D3 at any time, and the wire saw 5 is constructed with a concrete structure so as to surround the outer peripheral surface of the concrete structural member C. It is not necessary to hang it on the member C, and the large concrete structural member C can be easily pushed and cut.

Further, according to the dismantling device provided with the cutting device 4A of the first embodiment and the cutting device 4B of the second embodiment, the positions and arrangements of the concrete structural members C are used to position and arrange the entire cutting devices 4A and 4B by using the swing arm. It can be moved according to the shape and the like, and the push-cutting work of the large concrete structural member C can proceed smoothly.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments, and various aspects of the present invention are described within the scope of the claims. It can be changed.

For example, a configuration in which one relay pulley 20 is provided between the pair of propulsion pulleys 7A and 7B as the cutting device 4A has been described by illustration and the like, but when only one relay pulley 20 is used in this way, If the distance between each of the propulsion pulleys 7A and 7B and the relay pulley 20 is much larger than 1000 mm, or if it is difficult to maintain the tension of the wire saw 5, the relay pulley 20 is placed between the propulsion pulleys 7A and 7B. Multiple can be provided. That is, as long as the tension of the wire saw 5 can be held well, the distance between the pulleys in the width direction D1 of the concrete structural member C and the number of relay pulleys 20 are not particularly limited.

Further, also in the cutting device 4B described above, if the tension between the wire saw 5A between the propulsion pulley 7A and the relay pulley 20X and the wire saw 5B between the relay pulley 20Y and the relay pulley 7B can be satisfactorily maintained, the concrete structural member C The distance between the pulleys in the width direction D1 and the number of sets of relay pulleys 20X and 20Y are not particularly limited. That is, as long as the tension of the wire saw 5 can be held well, the distance between the pulleys in the width direction D1 of the concrete structural member C, the number of relay pulleys 20X and 20Y, and the number of wire saws 5 are not particularly limited. Two or more sets of relay pulleys 20X and 20Y arranged so as to be displaced in the direction orthogonal to the width direction D1 of the concrete structural member C may be provided, whereby two or more sets of relay pulleys 20X and 20Y may be provided.
Even when the width dimension W of the concrete structural member C is larger or the distance between the pair of propulsion pulleys 7A and 7B is further widened, the distance at which the wire saw 5 is wound in the width direction D1 of the concrete structural member C. Is moderately suppressed, and the tension of the wire saw 5 is well maintained.

4,4A, 4B Cutting device 5,5A, 5B Wire saw 6 Wire saw drive unit 7A, 7B Propulsion pulley 11 Pulley propulsion unit 20, 20X, 20Y Relay pulley C Concrete structural member (object to be cut)

Claims (3)

A pair of propulsion pulleys arranged at intervals wider than the width of the concrete structural member,
Two relay pulleys arranged between the pair of propulsion pulleys and displaced in the depth direction orthogonal to the width direction and the height direction of the concrete structural member, and two relay pulleys.
A wire saw wound between one of the propulsion pulleys and one of the relay pulleys, and between the other of the propulsion pulleys and the other of the relay pulleys.
A wire saw drive unit that circulates and drives the wire saw,
The pair of propulsion pulleys and the relay pulley are provided with a pulley propulsion unit that independently propels the pair of propulsion pulleys and the relay pulley in a direction of approaching and separating from the concrete structural member.
Cutting device. Two or more sets of the relay pulleys arranged by shifting the positions of the concrete structural members in the depth direction are provided.
The cutting device according to claim 1. The cutting device according to claim 1 or 2 is attached to the tip end portion of the swing arm.
Demolition device.

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