JPH0510468B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for destroying and demolishing high-rise concrete structures such as chimneys.

Conventionally, when demolishing a high-rise concrete structure, such as a chimney, a scaffold was built around the chimney, and workers climbed onto this scaffold and used hammers, hand breakers, etc. to destroy and demolish the chimney sequentially from the top to the bottom. Another method was to cut the base of the chimney and demolish it by lowering it to the ground.

However, the former method has the disadvantage that pieces of the chimney are scattered over a wide area, making it dangerous and inefficient, while the latter method causes the chimney, a long object, to fall to the ground, causing accidental damage to workers. This is undesirable from a work safety perspective as it can lead to accidents. Furthermore, both methods are disadvantageous in that they involve large noises and vibrations, causing pollution problems.

A device that crushes concrete using compressive stress has also been proposed, but its crushing ability is inferior, and because it uses compressive stress, it cannot cut reinforcing bars. A cutter blade must be attached, and in this case, the concrete is crushed at the concrete crushing section and the reinforcing bars are cut at the reinforcing bar cutting section, which is a troublesome and complicated operation. In order to eliminate the above-mentioned drawbacks, a cutter device was suspended from a telescoping mast in a height-adjustable manner, as described in Japanese Patent Publication No. 59-16063, and the cutter device was used to crush concrete structures by shear stress. An apparatus for destroying a concrete structure and a method for destroying a concrete structure using the apparatus have been proposed.

According to the above method, the concrete part of the concrete structure is crushed in the concrete crushing section,
Furthermore, there was no need to perform the troublesome work of cutting the reinforcing bars using a reinforcing bar cutting section, allowing for efficient demolition. Furthermore, compared to the case where the base of the chimney is cut off and the chimney is brought down as described above, vibration and noise are significantly reduced, and the method is highly safe.

However, even with the above-mentioned method of breaking by shear stress using the cutter device, there is a risk that the crushed pieces will scatter and fall on the heads of workers and third parties such as passersby. It could not be said that the purpose of ensuring the safety of third parties such as passersby was sufficiently achieved.

In order to solve this problem, conventionally, a method has been adopted in which a scaffold is erected around the structure and a net is attached to the scaffold to prevent debris from scattering, and the structure is destroyed. However, with this method, it takes a lot of effort to assemble the scaffolding and attach and dismantle the net, and when these assemblies and dismantlings are carried out at high places, there is a problem that the work is dangerous. Under these circumstances, demolition companies for this type of high-rise concrete structures have been looking for demolition methods that can be done efficiently, with low noise and vibration, and that can ensure work safety. It was wanted.

The present invention has been developed in view of the above circumstances, and enables high-rise concrete structures to be demolished efficiently, with low noise and vibration, and in addition, the work is efficient and prevents debris from scattering and falling, resulting in safer work. The purpose of this invention is to provide a method of destroying high-rise concrete structures that can ensure safety.

That is, the present invention suspends a cutter device on a telescoping mast of a mobile working machine in a height-adjustable manner, and furthermore, a mesh for preventing scattering of fragments is mounted on the telescopic mast of the mobile working machine in a height-adjustable manner. Suspended by covering part or all of the surrounding area of a high-rise concrete structure,
A high-rise concrete structure characterized in that the high-rise concrete structure is sequentially crushed and cut from the upper part of the structure using the above-mentioned cutter device and destroyed by shearing stress while preventing the scattering of fragments with the above-mentioned scattering prevention net. The main point is the destruction method.

Hereinafter, the present invention will be explained in detail based on the drawings.

In the method of the present invention, a net for preventing scattering of debris is hung from a telescopic mast of a mobile work machine so as to be adjustable in height, covering part or all of the periphery of a high-rise concrete structure. The height, size, shape, etc. of the hanging net should be selected appropriately depending on the size, shape, etc. of the high-rise concrete structure to be destroyed, but the hanging height of the net should be slightly higher than the high-rise concrete structure to be destroyed. It is preferable to hang it high.
Further, as a hanging method, for example, as shown in FIG. 1, a telescopic mast 2 of a mobile working machine 1 such as a lift truck, which is different from the telescopic mast of the mobile working machine on which the cutter device is hung, is used. It can be hung on. In Fig. 1, 3 is a chimney as a high-rise concrete structure;
A net 4 is suspended from a part of the surrounding area. In this embodiment, as shown in FIGS. 1 and 2, the net 4 is suspended on a plane from a cylindrical support 5 at the top, and surrounds the chimney 3 as it goes toward the bottom. It is suspended from the ground, and several main parts are anchored to the ground 7 by wires 6, 6, 6, . . .

The mast 2 of the mobile work machine 1 has a large number of mast-constituting cylinders 8 ₁ , 8 ₂ , 8 ₃ . . . slidably fitted in order,
Each of the mast-constituting cylinders 8 ₁ , 8 ₂ , 8 ₃ ... is connected to each other by a cylinder and a piston (not shown), and by protruding and retracting these pistons, the length of the mast 2 can be adjusted arbitrarily. It is configured to expand and contract.

The hanging height of the net 4 can be adjusted by extending or contracting the length of the mast 2 in this way, but the position of the movable pulley 10 can also be adjusted up or down by winding up the winch wire 9 or lowering it in the opposite direction to the winding up. The hanging height of the net 4 can also be adjusted by

The material of the net 4 used in the present invention is as follows:
Various materials can be used; for example, metals such as iron, aluminum, or alloys thereof, synthetic resins, etc. can be used; in short, any material with strong strength can be used. be.

In the method of the present invention, as described above, a net for preventing scattering of debris is suspended from the telescopic mast of a mobile work machine in a height-adjustable manner, covering part or all of the periphery of a high-rise concrete structure, and a cutter device The high-rise concrete structure is successively crushed and cut from the upper part of the structure by shearing stress using the above-mentioned fragment scattering prevention net, and the fragments are prevented from scattering.

As shown in FIGS. 3 and 4, the cutter device 11 has a scissor-shaped cutter portion 12 that can be opened and closed.
The cutter part 12 has a first cutter body 1
3 and a second cutter body 14. A hydraulic device 16 that opens and closes the cutter portion 12 is provided inside the case body 15. The first cutter body 13 and the second cutter body 14 are inserted into the case body 1 through the opening _15a of the case body 15.
5 It stands out from the outside. First cutter body 1
3 is rotatably supported on the crankshaft 17, the second cutter body 14 is fixed to the case body 15, and the first cutter body 13 is rotatably supported on the crankshaft 17.
When rotating around 7, the first cutter body 13
It is configured so that it closes.

Each of the cutter bodies 13 and 14 has an arm shape, and cutter blades 18 and 19 are fixed to each of the cutter bodies 13 and 14, respectively. Furthermore, opposing clamping plates 20 and 21 are provided at the tip of the cutter portion 12.

The cutter device 11 configured as described above is used by being suspended from a retractable mast 23 of a mobile work machine 22 different from the mobile work machine 1, as shown in FIG. 1, for example. In addition, 24 in the figure is a movable pulley.

The chimney 3 is destroyed by the cutter device 11 configured as described above. The mast 13 is extended to suspend the cutter device 11 at the required height. First, the upper edge of the chimney 3 is sandwiched between the first cutter body 13 and the second cutter body 14, and the first cutter body 13
By rotating and closing the chimney 3, the upper part of the chimney 3 is cut and destroyed with cutter blades 18 and 19. Furthermore, the upper part of the chimney 3 can be crushed and destroyed using the clamping bodies 20 and 21. By repeating such cutting or crushing operations, the movable pulley 24 is gradually lowered, and the chimney 3 is sequentially destroyed from the top to the bottom, while the cutter device 11 is moved to a lower position. As the demolition work progresses, debris collects around the chimney 3, but by holding the debris between the clamping plates 20 and 21, the cutter device 11 can be moved to an appropriate position and loaded onto a transportation truck or the like.

Incidentally, if reinforcing bars are buried in the chimney 3, the cutter blades 18 and 19 can similarly cut the reinforcing bars.

According to the method of the present invention configured for the above-mentioned purpose, since the net 4 is hung around a part of the chimney 3, the pieces of the destroyed chimney 3 are not scattered over a wide area, resulting in extremely high safety. Able to perform high-level work.

In addition, since the cutter device 11 is used to crush and cut by shear stress, the work can be performed with extremely little noise and vibration. Further, since there is no need to set up scaffolding as in the conventional method, the work can be carried out advantageously in terms of labor and cost.

FIG. 5 shows another embodiment of the present invention, in which a debris scattering prevention net 4 is suspended together with the cutter device on a telescoping mast 2 of the mobile working machine 1 on which the cutter device is suspended. This is a case in which the net 4 is hung all around the chimney 3. In this embodiment, the net 4 is attached to a ring-shaped support 25, and the support 25 is connected to a wire 26.
The cutter device 11 is suspended from the hook 27 via the hook 27 . In this way, the net and cutter device can be hung from separate masts, or they can be hung from the same mast. In the latter case, only one telescopic mast is required, and only one mobile work machine is required to support the mast, resulting in lower work costs. Furthermore, if the above-mentioned cutter device 11 and the scattering prevention net 4 are moved to the lower position by retracting the above-mentioned telescoping mast, the mast should be left stretched high for a long period of time. There is no risk of sudden accidents such as falls. Furthermore, since the scattering prevention net 4 is suspended to cover the entire circumference of the chimney 3, all the pieces of the destroyed chimney 3 are contained within the net 4, making it possible to perform work with extremely high safety.

The present invention is not limited to the case of demolishing chimneys as described in the above embodiments, but can be similarly applied to demolition of high-rise buildings, etc. in addition to chimneys.

As explained above, according to the present invention, the scattering prevention net is suspended from the telescoping mast of the mobile work machine in a height-adjustable manner so as to cover part or all of the periphery of the high-rise concrete structure. , it is possible to prevent the scattering of debris with high work efficiency, and not only can destruction be carried out at low cost and with high safety, but also work can be carried out with low noise and low vibration.
This invention is also useful for preventing pollution. Furthermore, since there is no need to construct scaffolding, it is advantageous in terms of labor and cost. Furthermore, when lowering the anti-scattering net while destroying a high-rise concrete structure, it is easier for the worker to check the progress of the destruction, and the destruction work and the removal of the anti-scattering net can proceed at the same time. This eliminates the need to remove the net once the destruction is complete, further improving work efficiency.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and Fig. 1 is a side view showing an embodiment of the method of destroying a high-rise concrete structure of the present invention, and Fig. 2 shows a chimney and a net as seen from the direction of the arrow in Fig. 1. 3 is a perspective view showing an example of a cutter device, FIG. 4 is a longitudinal sectional view of the cutter device, and FIG. 5 is a side view showing another embodiment of the present invention. 3...Chimney, 4...Net, 11...Cutter device.

Claims (1)

[Claims] 1. A cutter device is suspended in a height-adjustable manner from the telescoping mast of a mobile work machine, and a height-adjustable net for preventing debris from scattering is hung on the telescoping mast of the mobile work machine, and the cutter device is hung around the high-rise concrete structure. The high-rise concrete structure is sequentially crushed and cut from the top of the structure by shear stress using the cutter device while preventing fragments from scattering with the scattering prevention net. A method of destroying a high-rise concrete structure characterized by destroying it.