JPH0823226B2 - Protective device for cutting and demolition of reinforced concrete structures - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building, bridge, foundation, large plant, subway, nuclear power plant, and a protective device for a cutting and dismantling device construction method by wire sawing of a reinforced concrete structure.

[0002]

2. Description of the Related Art Conventionally, as a method for dismantling reinforced concrete structures, a method of destroying explosives and chemicals by using the expansion pressure or gas pressure, a method of crushing steel balls, a vibration hammer, hydraulic pressure, or a disk Known is a method of cutting with a blade or a water jet using water pressure.

However, any of the above-mentioned construction methods of destroying with explosives and crushing with steel balls is suitable for completely dismantling the target structure, and therefore can be used almost as a partially disassembled structure of the structure. In addition, since the influence of vibration and noise on the surrounding environment is large, the place of use and the conditions of use are severely limited. on the other hand,
The method of cutting by rotating the blade on the disc is suitable for the partially decomposed body of the structure, but the cutting ability is small, the cutting cross-sectional area is limited to a narrow range, and the cuttable thickness is 3
The maximum is about 0 to 40 cm. Further, the method of cutting with a water jet using water pressure has practical problems such as a significantly inferior cutting ability, a large mechanical equipment is required, and the cutting surface spreads radially. Further, the conventional cutting and disassembling device, there is a problem in terms of workability, safety, cutting efficiency, etc. in cutting and dismantling in high places and water.
It was inappropriate.

Therefore, in order to solve the above problems, the present invention has recently developed various devices for cutting and dismantling a reinforced concrete structure by wire sawing. This wire sawing device is a device that winds a cutting cable around an object to be cut and circulates while pulling it with a cable drive device, which is a cutting method that was conventionally used exclusively for cutting out stone materials in a quarry. . As the cutting cable, for example, a wire rope in which beads having a diamond abrasive grain layer and a coil spring or other spacer are alternately fitted, and a stopper made of a steel ring or the like is crimped at required intervals is used. It

Although this wire sawing device for reinforced concrete structures has been able to completely solve the above-mentioned problems of the prior art, it can show a cutting capacity 5 to 10 times that of conventional cutting devices, especially in underwater cutting. It's known.

[0006]

In the above-mentioned wire sawing device for reinforced concrete structures, the worker does not have to engage in the cutting work on the side of the object to be cut as in the case of the conventional device, and from there, the guide pulley is used. It is sufficient to operate the cable drive device in a remote place manually, remotely, or automatically without the intervention of the above, so the safety and workability are far superior to the conventional devices. ing.

In the above wire sawing, a cutting cable is used, for example, a running speed of 15 to 40 m / sec,
When circulating with tension of 50 to 200 kg on the tension side,
When the material to be cut is stone, which is a conventional wire sawing object, it is composed of granular aggregates such as limestone with relatively low hardness, and because it is generally a single structure, the tensile load applied to the cutting cable is Since the cutting cable is relatively small and its fluctuation is small, the cutting cable circulates at a substantially constant traveling speed and tension, and the cutting operation proceeds stably without any problem. Further, in that case, since the cutting beads are consumed long before the wire rope is broken due to its fatigue, the wire rope is hardly broken during the wire sawing.

[0008] However, when the object to be cut is a reinforced concrete structure, the tensile load applied to the cutting cable is generally large and the fluctuation is caused because it is composed of a concrete layer and longitudinal and lateral reinforcements therein. It is also large, especially when the cutting moves from the concrete layer to the reinforcing bar or when the cutting cable is caught on the reinforcing bar, which causes wire rope extension and fatigue, so it suddenly breaks especially at the joint part during wire sawing. May lead to.

However, the cutting cable thus broken during wire sawing separates from the object to be cut, the guide pulley and the like and jumps to the surroundings, which is harmful to not only persons involved in the construction but also the general public. There was a possibility. The cutting cable has a unit weight of approximately 300 to 500 g / m depending on its specifications, and 20 to 5
The length is 0 m or more, and as described above, it is circulating at a high speed of 15 to 40 m / sec, that is, 54 to 144 km / hr, and is pulled by a tension of 50 to 200 kg. When it breaks, a considerable impact force is exerted on the surroundings. Even if the cutting cable does not break, the cutting cable released from the object to be cut at the same time as the cutting ends,
There is also a problem that the phenomenon similar to the above causes the material to jump around or toward the cable drive device.

The present invention provides a protective device for cutting and dismantling of a reinforced concrete structure, which is capable of preventing damage to the cutting cable during wire sawing and splashing of the cutting cable at the end of cutting. is there.

[0011]

A protective device for cutting and dismantling a reinforced concrete structure according to the present invention is a device for cutting and dismantling a reinforced concrete structure by wire sawing in which a cutting cable is circulated by a cable drive device. Along the cable, a tubular or tunnel-shaped protective fence having a hollow portion for passing the cutting cable is provided, and in addition, a wall-shaped protective fence having a hole portion for passing the cutting cable is provided in front of the cable driving device. The feature is that it is divided or opened and closed.

The above-mentioned tubular or tunnel-shaped protective fence or wall-shaped protective fence can be easily grasped from the outside so that the running state of the cutting cable and the cutting progress can be grasped from the outside.
It is preferable to use a transparent body or a net.

[0013]

[Operation] The above-mentioned tubular or tunnel-shaped protective fence stops the cutting cable that has jumped in the peripheral direction due to the breaking or the end of cutting of the cutting cable while running inside the protective fence to protect employees and other people. Prevent harm. This protective fence may be installed continuously or intermittently at an appropriate position along the cutting cable, and may be directly anchored to an object to be cut around which the cutting cable is wound. Further, the protective fence may surround a part or the whole of the cable driving device that drives the cutting cable, and it may be attached to the cable driving device. For places where the cutting cable is unlikely to jump upwards, or where there is little risk of jumping upwards, a flat protective surface should be used to surround only the side surface of the traveling cutting cable. You may install a fence suitably.

On the other hand, in the above wall-shaped protective fence, the cutting cable jumping toward the cable driving device is cut off in front of the cable driving device when the cutting cable is broken or cut while the vehicle is running. Prevent harm to operating personnel and others. This protective fence is
It may be attached to the cable driving device, may be provided with a side wall that surrounds a part or the whole of the cable driving device, and the wall body that blocks the bouncing cutting cable may be a curved surface.

[0015]

[Embodiment 1] Next, the present invention will be specifically described based on embodiments. In FIG. 1, which is a side view showing an example of a cutting and dismantling device for a reinforced concrete structure according to the present invention, a rail 2 is laid on a road surface 1 and a cable drive device 3 is movably installed on the rail 2. The cable drive device 3 includes a drive pulley 4, a drive control mechanism thereof (not shown), a tension side tension pulley 5 and a slack side tension pulley 6 arranged on the same plane adjacent to the drive pulley 4, and It is composed of a wheel 7 fitted into the rail 2 and a drive control mechanism (not shown) for the wheel 7.

A guide pulley base 8 is provided at the end of the road surface 1.
Is anchored. The guide pulley base 8 is provided with vertical guide pulleys 9 and 10 at the top and bottom.

On the other hand, the cutting cable 11 is passed through the cable insertion holes 13 and 14 formed in the horizontal wall 12 in order to cut and dismantle the reinforced concrete horizontal wall 12 in the sea.
On the way, the vertical guide pulleys 9 and 10 guide each other to join them, and they are hung on the drive pulley 4 via the tension side tension pulley 5 and the slack side tension pulley 6 of the cable drive device 3 tension side tension pulley drive device 3. .

Guide pulley base 8 and cable drive device 3
A tunnel-type protective net fence that can be installed between
A plurality of 5 are installed so as to surround the two cutting cables 11, 11 running in the reciprocating direction in the cable passage cavity portion 16, and further, in front of the cable drive device 3, an installation-type wall-type protective net fence. 17 is a double-sided cutting cable 1 that runs in the cable passage hole 18 in the reciprocating direction.
It is installed so that 1 and 11 can pass through.

2A and 2B which are enlarged perspective views of a tunnel type protective net fence and a wall type protective net fence.
As also shown in FIG. 1, the tunnel-type protective net fence 15 and the wall-type protective net fence 17 each include a frame 19 including installation legs and a net 20 stretched over the frame 19, and the tunnel-type protective net fence 15 In the above, a cable passage hollow portion 16 is formed, and in the wall-type protective net fence 17, a cable passage hole portion 18 is formed.

As shown in FIG. 2C, the tunnel-type protective net fence 15 can be divided and joined in a substantially L-shaped cross section along the running direction of the cutting cable 11, or as shown in FIG. 2D. As described above, the hinge 30 may be provided at the connecting portion between the one side surface and the ceiling surface so that the hinge 30 can be opened and closed. In addition, this tunnel type protective net fence 15
The installation height may be adjustable according to the arrangement height of the cutting cable 11, and further, the cutting cable 1
1 may be enclosed for each line. Further, instead of the tunnel-type protective net fence 15, preferably, the cutting cable 11 is divided into and can be joined into a half-cylindrical direction along the traveling direction, or the half-cylindrical portion is hinged so as to be openable and closable by a hinge or the like. A tubular protective net fence may be used. Further, the wall-type protective net fence 17 may be a dividable one, or may be one having a peripheral side wall like the tunnel-type protective net fence 15 described above, and a cutting cable. The installation height may be adjustable according to the arrangement height of 11.

In the above structure, the cable driving device 3
When each drive control mechanism for the drive pulley 4 and the wheels 7 in Fig. 2 is operated, the drive pulley 4 is rotationally driven and the cable drive device 3 is biased rearward along the rail 2, so that the endless cutting cable is used. 11 is circulated while being pulled by a required tension. By circulating the cutting cable 11 as described above, the horizontal wall 12 that is an object to be cut.
Is completely cut between the cable insertion holes 13 and 14.
By repeating such a cutting operation in the vertical and horizontal directions, the horizontal wall 12 can be easily opened in any shape or can be disassembled and removed.

When the cutting cable 11 is broken during the above-described wire sawing, or when the cutting is completed and the wire is released, the tunnel-type protective net fence 15 prevents the cutting cable 11 from jumping in the peripheral direction. In addition, the wall-type protective net fence 17 prevents the cutting cable 11 from jumping in the direction of the cable drive device 3.
Shut off in front of. It should be noted that the tunnel-type protective net fence 15 and the wall-type protective net fence 17 are appropriately moved or the tunnel-type protective net fence 17 is appropriately moved in response to the backward movement of the cable driving device 3 as the wire sawing progresses. It is preferable to newly install the fence 15 and the like.

If the above-mentioned split-type tubular or tunnel-type protective fence is used, it can be made compact by dividing it during transportation and overlapping the recesses with each other. Also, when using a tubular or tunnel type protective fence that can be opened and closed, by folding the opening and closing parts inward or outward during transportation, it is possible to stack many fences and make it compact, After the fence is installed, the opening / closing part can be opened and the wire can be arranged in the fence in the shape of a tube or tunnel, thus improving work efficiency.

[0024]

Second Embodiment Next, the present invention will be specifically described based on another embodiment. In FIG. 3, which is a partial side view showing another example of the cutting and dismantling device for a reinforced concrete structure according to the present invention, a cutting cable 11 is a reinforced concrete vertical wall 2
In order to cut and disassemble 1, the vertical wall 21 is vertically inserted into the cable insertion holes 13a and 14a formed in the upper and lower parts of the vertical wall 21 and is vertically anchored to the guide pulley base 22 anchored near the cable insertion hole 14a of the vertical wall 21. Guide pulley 2
The vehicle is guided by 3 and merges, and is circulated by being hung on a drive pulley (not shown) of the cable drive device 3 as in the case of the first embodiment.

Attachable tunnel-type protective net fences 24 are anchored to the front and back surfaces of the vertical wall 21 by their attachment pieces 25 so as to surround the cutting cable 11 running in the cable passage cavity 16a. ,
Further, after the guide pulley stand 22 is installed the tunnel type protective net fence 15 of the installation type as in the case of the first embodiment.

As shown in FIG. 4, which is an enlarged perspective view of the attachable tunnel-type protective net fence, the attachable tunnel-type protective net fence 24 includes a frame 19
a, a mounting piece 25 laid on one side of the bottom part thereof, and a net 20a stretched on the frame 19a, and one side surface and a ceiling surface of the hinges 30 and 3 with springs.
It is hinged so that it can be opened / closed by 0, and preferably can be held in each open / closed state, and a cable passage cavity 16a is formed inside.

The tunnel-type protective net fence 24 mounted on the front and back surfaces of the vertical wall 21 completely prevents the broken cutting cable 11 from jumping from the vertical wall 21.

Although not shown, in this embodiment as well, a wall-like protective fence similar to that in the first embodiment may be provided in front of the cable driving device.

[0029]

[Embodiment 3] Further, the present invention will be specifically described with reference to other embodiments. In FIG. 5, which is a partial side view showing another example of the cutting and dismantling method of the reinforced concrete structure according to the present invention, the cutting cable 11 is arranged around the vertical pillar 26 so as to cut and dismantle the reinforced concrete vertical pillar 26 substantially horizontally. And is guided by the pair of horizontal guide pulleys 28, 28 and the pair of vertical guide pulleys 29, 29 in the guide pulley base 27 anchored near the end of cutting of the vertical column 26, and merges. As in the case of Example 1, the cable drive device 3 is hung on a drive pulley (not shown) and circulates.

On the side surface of the vertical column 26, a tunnel-type protective net fence 24 of a mounting type similar to that shown in FIG. 4 is provided so as to surround the traveling cutting cable 11 by the mounting knit 25 in the lateral direction. The anchoring is applied, and the guide pulley base 27 and the subsequent parts are the same as in the first embodiment.
An installable tunnel-type protective net fence 15 is installed. When the surface of the vertical column 26 is curved, the tunnel-type protective net fence 24 having a shape and material that can be attached to the curved side surface, or the shape and arrangement of the attachment piece may be appropriately selected.

The tunnel-type protective net fence 24 attached around the vertical column 26 completely prevents the broken cutting cable 11 from jumping from the vertical column 26.

Although not shown, a wall-like protective fence similar to that of the first embodiment may be provided in front of the cable driving device in this embodiment as well.

The types and installation methods of the protective fences shown in the above embodiments are merely examples for explaining the present invention, and therefore, the method of arranging the cutting cable, the type of guide pulley, and the like. Depending on the arrangement method, the state of the object to be cut and the surrounding environment, the cutting method and the purpose of cutting, etc.
It goes without saying that changes and additions should be made. For example, as shown in FIG. 6, the installable tunnel-type protective net fence 17 may be provided in the cable drive device 3, and the net fence 17 may be detachably attached to the cable drive device 3 at that time. The net fence 17 is shown in FIG. 2B.
The shape may be as shown in FIG.

[0034]

As described above, in the method for cutting and dismantling a reinforced concrete structure according to the present invention, a tubular or tunnel-shaped protective fence or a wall-shaped protective fence is used during wire sawing. The safety of workers and other people against breakage and jumping of cutting cables at the end of cutting is sufficiently secured,
Higher work efficiency can be obtained.

Further, since the tubular or tunnel-shaped protective fence is provided in front of the wall-shaped protective fence, at the time of jumping of the cutting cable, the jumping is restricted within a narrow range of the tubular- or tunnel-shaped protective fence at first. Since the bounce within that range is restricted by the wall-shaped guard fence, the bounce of the cutting cable to the rear of the cable drive device can be reliably prevented even with a small wall-shaped fence. .

Further, by making the tubular or tunnel-type protective fence split or openable, it is possible to store a large number of tubular- or tunnel-type protective fences in a compact manner by overlapping the recesses with each other, and to facilitate transportation. Become.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a protective device for cutting and dismantling a reinforced concrete structure according to the present invention.

2A and 2B are enlarged perspective views of the tunnel-type protective net fence and the wall-type protective net fence shown in FIG. 1, and FIG. 2C is a tunnel which can be divided and combined into a substantially L-shaped cross section. FIG. 2D is an enlarged perspective view of a tunnel type protective net fence in which a hinge 30 is provided at a connecting portion between one side surface and a ceiling surface of the type protective net fence.

FIG. 3 is a partial side view showing another example of the protective device for cutting and dismantling of a reinforced concrete structure according to the present invention.

FIG. 4 is an enlarged perspective view of the attachable tunnel-type protective net fence shown in FIG.

FIG. 5 is a partial side view showing another example of the protective device for cutting and disassembling a reinforced concrete structure according to the present invention.

FIG. 6 is a partial side view showing another example of the protection device for cutting and dismantling of a reinforced concrete structure according to the present invention.

[Explanation of symbols]

 3 Cable drive device 11 Cutting cable 15 Installation type tunnel protection net fence 17 Installation type wall protection net fence 24 Installation type tunnel protection net fence

Claims (2)

[Claims] 1. A cutting and disassembling apparatus for a reinforced concrete structure by wire sawing in which a cutting cable is circulated by a cable driving device, and a tubular shape or a tunnel having a hollow portion along which the cutting cable is passed along the running cutting cable. Protective device for cutting and dismantling reinforced concrete structures, characterized in that it is provided with a protective fence that can be divided or opened and closed. 2. A device for cutting and dismantling a reinforced concrete structure by wire sawing in which a cutting cable is circulated and run by a cable drive device. A protective device for cutting and dismantling a reinforced concrete structure, characterized in that a wall-shaped protective fence having a hole through which a cutting cable is passed is provided in front of the cable drive device.