JP6436733B2 - Demolition method of concrete slab - Google Patents

Description

  The present invention relates to a method for demolishing a concrete slab, and more particularly, to a method for demolishing the concrete slab in a state that allows passage under the concrete slab.

For example, the following methods are known as methods for dismantling concrete slabs (hereinafter also simply referred to as “slabs”) that constitute the ceiling of the platform floor of a station.
(1) A method in which a slab is cut into blocks with a wire saw and disassembled.
(2) A wet core drilling method in which cores are drilled and disassembled while water is injected.
(3) A method of dismantling manually using a breaker.
(4) A method of removing the slab by shaving it from below with a core machine (see Patent Document 1 below).

Unexamined-Japanese-Patent No. 2014-84590.

  In the case of the above-described conventional concrete slab disassembling method, the following problems can be considered.

In the methods described in the above (1) to (3), it is necessary to receive the debris of the demolished concrete under the slab to be demolished, so a cradle for receiving the debris must be installed below the dismantling position. I must.
However, the dismantling of the slabs that make up the ceiling of the station's home floor is usually done during the nighttime operation stoppage, and the installation and removal work of the gantry must be performed every time within this limited time. Was inefficient.

  In the method described in (4) above, since the worker performs the dismantling work from the scaffold provided below the slab, the scaffold also serves as the gantry. However, it will eventually require assembly and disassembly work of the scaffolding, and will also take time to fix and remove the core machine from the slab, and as above, construction within a limited time is inefficient. It remains.

  That is, the invention of the present application performs the installation work and the dismantling work of the gantry every time, even in the field where the dismantling work must be performed intermittently, such as the dismantling work of the slab that constitutes the ceiling of the platform floor of the station. One of the purposes is to provide a concrete slab dismantling method that does not need to be performed.

In order to solve the above-described problems, the first invention of the present application is a concrete slab dismantling method in which a concrete slab is disassembled into blocks, on the lower surface of the preceding dismantling part in the slab, this prior disassembly unit has covered, and I so as to support at sea urchin tip in the row dismantling unit on the lower surface of the outside of the lower surface and said prior disassembly of the adjacent disassembly portion adjacent each respective at least two portions straddling, fitted with the container , Applying an external force to the preceding dismantling part from the upper surface, dismantling the preceding dismantling part, installing a temporary beam so as to straddle the open space of the preceding dismantling part, and adjacent to the temporary beam and the preceding dismantling part as each lower surface of the outside of the demolition unit supported by each of at least two positions, instead attached to the container of the lower surface of the adjacent disassembly unit, giving an external force from the top to the adjacent dismantling section, the adjacent disassembly unit Dismantling That, characterized in that, to provide a disassembling method of the concrete slab.

  According to the present invention, even in a site where the dismantling work must be performed intermittently, it is not necessary to perform the installation work and the removal work of the gantry each time, so a lot of time is allocated to the dismantling work of the slab. Can improve the overall work efficiency.

Explanatory drawing which shows the installation state of the container at the time of the dismantling of a prior | preceding dismantling part. Explanatory drawing which shows the installation state of the container at the time of the dismantling of an adjacent dismantling part. Schematic of the demolition procedure of concrete slab. Explanatory drawing which shows the state in the middle of dismantling of a slab.

  The details of the concrete slab disassembling method of the present invention will be described below with reference to the drawings.

The present invention is a method in which the slab 10 is divided into small blocks and sequentially disassembled.
Hereinafter, the first dismantling range is referred to as “preceding dismantling unit 11”, and the dismantling range that follows adjacently is referred to as “adjacent dismantling unit 12”.

As shown in FIG. 1, first, the container 20 is attached to the lower surface of the slab 10.
The container 20 is attached so as to cover the preceding dismantling part 11 to be disassembled in advance.
The projected area of the container 20 in plan view is configured to have a size wider than the planned range of the preceding dismantling unit 11.
The container 20 is a steel plate (steel plate), and includes an attachment edge 21 for attachment to the lower surface of the slab 10 around the steel plate.
As will be described later, the container 20 is required to have a strength capable of withstanding the weight of the crushed pieces in the dismantled range and the impact of dropping when receiving pieces of the disassembled slab 10.
What is necessary is just to determine the size of the container 20 by the weight which an operator can handle easily at the time of attachment to the lower surface of the slab 10.

The operation of attaching the container 20 to the lower surface of the slab 10 is performed by an anchor bolt 22 driven into the slab 10 from the lower surface of the attachment edge 21 on the outer periphery of the planned disassembly range.
For this work, a scaffold is needed on the lower surface of the slab 10 so that the worker's hand can reach. However, since it does not carry heavy objects, it can be processed in a short time using a simple mobile scaffold.

As shown in FIG. 2, when the container 20 is attached to the lower surface of the preceding dismantling part 11, the slab 10 is disassembled by applying an external force from the upper surface.
In this case, as a method of disassembling by applying an external force from the upper surface of the slab 10, a known core drilling method such as a dry core drilling method using water or a wet core drilling method using water is appropriately used. You can choose.
In each of these drilling methods, only cylindrical holes can be opened, but slabs can be disassembled into wide blocks by wrapping the cylindrical holes or cutting between the cylindrical holes with a wire saw. Can do.
If a dry core drilling method that does not use water is adopted, there will be no inconvenience of leakage of water to passers-by passing under the slab 10, but depending on the situation, a wet core drilling method with high drilling efficiency may be used. It can also be adopted.

  Since the container 20 having a larger projected area than that range is attached under the preceding dismantling part 11, the fragments generated during dismantling do not fall into the passage under the slab 10, and the container 20 Can be received and accommodated.

When a large number of cylindrical holes are continuously drilled, a large block may be cut out if the periphery of the preceding dismantling part 11 is cut and trimmed.
In such a case, a wire is attached in the vicinity of the center of the block in advance, and the wire is attached to a pedestal or the like disposed in the sky.
Then, the block whose periphery and edge are cut can be removed in the lateral direction after being suspended in the middle, without being dropped into the container, or can be gently suspended in the container 20.

When the dismantling of the preceding dismantling part 11 is finished, the crushing piece accommodated in the container 20 is in a state where the hand can reach from above.
When the crushed pieces are removed by manual work from above the slab 10, the dismantling of the preceding dismantling part 11 that has become a hole is completed.

Next, as shown in FIG. 3, the temporary beam 50 is installed over the slab 10 so as to straddle the space (open space 40) where the preceding dismantling part 11 is dismantled.
Therefore, a member whose length of the temporary beam 50 is longer than the dismantling length of the preceding dismantling part 11 is employed.
Commercially available H steel can be used as the temporary beam 50.

Next, as shown in FIG. 4, the container 20 is attached under the adjacent dismantling part 12 adjacent to the preceding dismantling part 11.
In that case, one attachment edge 21 of the container 20 is attached to the temporary beam 50 using the anchor bolt 22 or the like.
The other attachment edge 21 of the container 20 is attached by an anchor bolt 22 driven into the slab 10 from the lower surface outside the range of the adjacent dismantling part 12.
At the time of this attachment work, a scaffold that allows the worker's hand to reach the lower surface of the slab 10 is required. However, as described above, it can be processed in a short time at night using a simple mobile scaffold.

Thus, when the container 20 is attached to the lower surface of the adjacent dismantling part 12, the slab 10 is disassembled by applying an external force from the upper surface.
In this case, as described above, a dry core drilling method that does not use water can be adopted as a method of dismantling by applying an external force from the upper surface of the slab 10.
The dismantling piece can be received and accommodated by the container 20 attached to the lower surface of the adjacent dismantling part 12, and the dismantling piece accommodated is removed to complete the dismantling of the adjacent dismantling part 12.
By repeating the operation for the adjacent dismantling unit 12 described above, it is possible to continuously dismantle the slab 10 in a wide range.

When these dismantling operations are interrupted, the container 20 is left attached to the lower surface of the slab 10 as it is.
Therefore, in the interruption period of the dismantling operation of the slab 10, it is possible to maintain the open state of the space below the storage device 20 as much as possible while maintaining the curing by the storage device 20.
Further, when resuming the work, the dismantling work can be started immediately.
Therefore, even in the field where the dismantling work must be performed intermittently, it is not necessary to perform the installation work and the removal work of the gantry each time, so a lot of time can be allocated to the dismantling work of the slab 10, Improvement in work efficiency can be expected.

DESCRIPTION OF SYMBOLS 10 Slab 11 Prior dismantling part 12 Adjacent dismantling part 20 Container 21 Mounting edge 22 Anchor bolt 30 Core machine 40 Open space 50 Temporary beam

Claims (1)

A concrete slab dismantling method in which a concrete slab is disassembled into blocks,
The lower surface of the preceding dismantling of the slab, said prior disassembly unit has covered, and straddles by Uni said prior disassembly section respectively at least two positions on the lower surface of the outside of the lower surface and said prior disassembly of the adjacent disassembly portion adjacent to Attach the container so that it is supported by
An external force is applied to the preceding dismantling part from the upper surface to dismantle the preceding dismantling part,
Install a temporary beam so as to straddle the open space of the preceding dismantling part,
The temporary beam and to support in each respective at least two positions on the lower surface of the outside of the adjacent disassembly portion adjacent to said preceding dismantling section, instead attaching the housing member to the lower surface of the adjacent disassembly unit,
Applying an external force from above to the adjacent dismantling part to dismantle the adjacent dismantling part;
A method for dismantling a concrete slab, characterized in that

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