JPH0823172B2 - Demolition method for underground 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 method for dismantling an underground structure, and more particularly to a method for cutting and dismantling a structure having an underground space such as an underground passage, a common ditch and a basement by a wire saw method.

[0002]

2. Description of the Related Art Underground passages, basements, etc. are expanded at any time, for example, in response to expanding demand, and in the expansion of underground structures of this type, existing structures are completely removed, Construction of new structures is also under way. As a method of dismantling and removing underground structures used in such cases, conventionally, an earth retaining wall was formed around the structure,
Generally, the method of exposing the outer periphery of the structure by excavating the inside of the earth retaining wall and using a crushing machine such as a breaker to destroy and remove the upper floor plate, side wall, and lower floor plate of the structure Has been adopted. However, such a conventional method of dismantling an underground structure has technical problems described below.

[0003]

That is, in the above-mentioned conventional dismantling method, since the structure is destroyed and removed by using the crushing machine, there is a problem that vibration and impact of the crushing machine adversely affect the surrounding environment. It was Also, in the conventional dismantling method, the inside of the earth retaining wall is root-cut, and a crushing machine is installed on the root-cut surface, which requires a fairly large work space on the outer periphery of the structure. However, there was room for improvement in terms of construction efficiency by suspending the crushing machine.

The present invention has been made in view of the above problems, and an object thereof is to prevent the generation of vibrations and shocks and to make underground construction possible with high efficiency. To provide a demolition method.

[0005]

In order to achieve the above object, the present invention is a method for dismantling an underground structure made of reinforced concrete, which is installed underground, after exposing the upper floor slab of the underground structure, A wire saw driving device is installed on one end side on the exposed upper floor slab, and the wire saw is wound around the upper floor slab to operate the driving device, whereby the wire saw is circulated and partially cut and removed. The wire saw is wound around the side wall of the structure through the first step to be performed and the removed portion of the upper floor slab that has been cut and removed in the first step, and the drive device is operated, thereby circulating the wire saw. The second step of cutting and removing a part of it,
After sequentially moving the drive device to the other end side of the upper floor slab and repeating the first and second steps to completely remove the upper floor slab and the side wall of the structure, the structure may be provided as necessary. And a third step of cutting and removing the lower floor slab with a wire saw.

In the third step, a pair of excavation grooves are formed on both outer sides of the side wall of the structure, the drive device is installed in one of the excavation grooves, and the lower floor slab is installed from one of the excavation grooves. A through hole is formed to reach the other excavation groove through below, and the wire saw is inserted into the through hole, and the wire saw is circulated by the operation of the drive device to move the lower floor slab to a structure. Can be cut in a direction orthogonal to the longitudinal axis of the.

[0007]

According to the method for dismantling an underground structure having the above structure, since the upper floor slab, the side wall, and the lower floor slab of the structure are cut and removed with a wire saw, vibrations are caused like a crushing machine. Or shock does not occur. Further, the upper floor slab and the side wall of the structure are partially cut and removed while sequentially moving the wire saw driving device installed on the upper floor slab from one end side to the other end side. The removal work of the part becomes easy. Further, if necessary, even when the lower floor slab of the structure is dismantled, the excavation groove formed on the outside of the structure only needs to have a space where the wire saw driving device can be installed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. 1 to 3 show an embodiment of a method for dismantling an underground structure according to the present invention. In the dismantling method shown in the figure, the upper floor slab 10 and the side wall 12 of a reinforced concrete underground structure constructed underground
And the case where all of the lower floor slab 14 is dismantled and removed. The side wall 12 is, in this embodiment, a pair of outer walls 12a.
And an inner wall 12b provided between the outer walls 12a.

In the construction of the dismantling method, first, an earth retaining wall is constructed by using a steel sheet pile or the like on the outer periphery of the underground structure to be dismantled, and then root cutting and excavation in the steel sheet pile is performed to construct the upper floor of the structure. When the plate 10 is exposed, the drive device 22 of the wire saw 20 is installed on one end side of the upper floor plate 10. In this embodiment, the drive device 22 of the wire saw 20 is of a type that moves on a rail 24, and includes a traveling drive pulley 26 of the wire saw 20 and a tension adjusting pulley 28 that applies a predetermined tension to the wire saw 20. Is equipped with.

FIG. 1 shows a part 1 of an upper floor slab 10 from the end thereof.
0a shows a state of vertically cutting 0a in a direction orthogonal to the longitudinal direction of the upper floor slab 10, in which the wire saw 20 is wound in a direction orthogonal to the longitudinal direction of the upper floor slab 10,
It is wound endlessly on the traveling drive pulley 26 of the drive device 22 via the guide pulley 30 and the tension adjusting pulley 28.

When the wire saw 20 is installed in the state shown in FIG. 1 and the drive device 22 is moved rearward while rotationally driving the traveling drive pulley 26, the wire saw 20 is applied with a predetermined tension to the upper floor slab. The upper floor slab 10 is cut by traveling in circulation while frictionally contacting the upper floor slab 10.
In FIG. 1, a through hole 32 is previously formed in the vicinity of the joint between the upper floor slab 10 and the side wall 12 by a boring machine or the like, and the wire saw 20 is installed by inserting the through hole 32. The joint between the part 10a of the upper floor slab 10 to be cut and removed and the side wall 12 is horizontally cut by the wire saw 20 before or after the cutting shown in FIG.

As described above, the part 10 of the upper floor slab 10 is
When a is vertically and horizontally cut and separated from the side wall 12, the part 10a of the upper floor slab 10 is suspended and removed by a crane (not shown) (first step). Then, as shown in FIG. 2, a part of the side wall 12 is cut and removed by operating the driving device 22 of the wire saw 20 installed on the upper floor slab 10 in the same manner as described above.

FIG. 2 shows a state in which a part of the outer wall 12a is cut. The cut state shown in the figure is the outer wall 12a.
Shows a case of vertically cutting the wire saw, and the wire saw 20 is
By forming a through hole 32 in the outer wall 12a and using the space of the upper floor slab 10 that has been cut and removed in the first step, the outer wall 12a is wound around and driven by the traveling drive pulley 26. Is cut vertically. A part of the outer wall 12a separated by the vertical and horizontal cutting with the wire saw 20 is suspended by a crane and removed as in the above (second step).

When cutting the outer wall 12a, root cutting and excavation in the earth retaining wall so that a part of the outer wall 12a is exposed is performed in parallel with the cutting work of the upper floor slab 10, but construction efficiency is taken into consideration. Then, in cutting and removing the side wall 12, it is better to first cut and remove a part of the inner wall 12b and then cut and remove the outer wall 12a. Then, the outer wall 12a and the inner wall 12
When a part of each of b is cut and removed, the drive device 22 is moved to the other end side of the upper floor slab 10 and the wire saw 20 is installed in the state shown in FIG. 1 again, and a part of the upper floor slab 10 is cut. The 1st process of removing later is implemented, and the 2nd process of removing again after cutting a part of side wall 12 again is performed after that.
When the upper floor slab 10 and the side wall 12 are completely cut and removed by repeating the operations of the first and second steps, finally, as shown in FIG. 3, the lower floor slab 14 is cut and removed. Is done.

When the lower floor slab 14 is cut and removed, excavation grooves 34, which are deeper than the lower floor slab 14, are formed on both outer sides of the side wall 12. The formation of the excavation groove 34 is performed in parallel with the cutting and removing work of the upper floor slab 10 and the side wall 12. When the excavation groove 34 is formed, the drive device 22 is installed at the bottom of one of the excavation grooves 34. To be done. Then, the through holes 32 are formed from one of the excavation grooves 34 toward the other. The perforation of the through hole 32 is performed by forming the ground stone layer 36 below the lower floor slab 14.
Is performed so as to reach the other excavation groove 34. When the through hole 32 is bored, the wire saw 20 is inserted through the wire saw 20 and wound around the lower floor slab 14, and the lower floor slab 14 is vertically cut to separate the lower floor slab 1.
4 is pulled out to the side of the excavation groove 34, suspended by a crane, the lower floor slab 14 is partially removed, and the same work is repeated to completely dismantle the lower floor slab 14.

At this time, a part of the vertically cut lower floor slab 14 is pulled out to the side of the excavation groove 34 in which the driving device 22 is installed, and further cut by the wire saw 20 in the lateral direction or pulled out. If it is further divided from the center portion before, it can be pulled out to the digging groove 34 side without making the length of the digging groove 34 on both sides longer than necessary. In addition, in the said Example, the case where the lower floor slab 14 of a structure was also cut and removed was illustrated, but when dismantling a structure, the lower floor slab 14 may not be removed but may be used as it is by adding concrete. Therefore, in that case, the present invention may be applied to the cutting and removal of the upper floor slab 10 and the side wall 12.

[Brief description of drawings]

FIG. 1 is a construction explanatory diagram for cutting and dismantling a part of an upper floor slab by a method for dismantling an underground structure according to the present invention.

FIG. 2 is a construction explanatory diagram when cutting and disassembling a part of a side wall by the dismantling method.

FIG. 3 is a construction explanatory view when cutting and dismantling a lower floor slab of the dismantling method.

[Explanation of symbols]

 10 Upper Floor Slab 10a Part of Upper Floor Slab 12 Side Wall 12a Outer Wall 12b Inner Wall 14 Lower Floor Slab 20 Wire Saw 22 Drive Device 26 Travel Drive Pulley

Claims (2)

[Claims] 1. A method of dismantling an underground structure made of reinforced concrete, which is installed in the ground, wherein after exposing the upper floor slab of the underground structure, a wire saw driving device is provided on one end side of the exposed upper floor slab. First step of installing and winding the wire saw around the upper floor slab and operating the drive device to circulate the wire saw and cut and remove a part thereof, and the upper floor cut and removed in the first step A second step in which the wire saw is wound around the side wall of the structure through the removed portion of the plate and the drive device is operated, whereby the wire saw is circulated and cut to remove a part thereof, After sequentially moving to the other end side of the upper floor slab and repeating the first and second steps to completely remove the upper floor slab and the side wall of the structure, the lower floor slab of the structure is optionally used. The wire saw A method for dismantling an underground structure, which comprises a third step of cutting and removing by 2. In the third step, a pair of excavation grooves are formed on both outer sides of a side wall of the structure, the driving device is installed in one of the excavation grooves, and the one of the excavation grooves is moved downward from one of the excavation grooves. Form a through hole that reaches the other excavation groove through the bottom of the floor slab, and insert the wire saw into the through hole,
2. The method for dismantling an underground structure according to claim 1, wherein the wire saw is circulated by the operation of the driving device to cut the lower floor slab in a direction orthogonal to a longitudinal axis of the structure.