JP2022089713A - Scattering prevention system and demolition method of existing building - Google Patents

Abstract

To provide a scattering prevention system capable of easily preventing the scattering of crushed material in demolition of an existing building and capable of being lifted according to the progress of a demolition work.SOLUTION: A scattering prevention system 1 prevents scattering of crushed material in demolition of an existing building 2. An open hole 4 is formed at a floor slab 3 of the n-th floor to be demolished of the existing building 2. Open holes 4A, 4B are formed at floor slabs 3A, 3B of the (n-1)th floor and (n-2)th floor situated below the floors to be demolished. The scattering prevention system 1 comprises a plurality of support poles 20 inserted into the open holes 4, 4A, 4B and with a top projecting above the floors to be demolished, a cure sheet 30 stretched between the tops of the plurality of support poles 20 and an electric chain block 40 for lifting the support pole 20 while suspending and supporting the same.SELECTED DRAWING: Figure 1

Description

The present invention relates to a scattering prevention system that prevents scattering of crushed substances at the time of dismantling an existing building, and a method for dismantling an existing building using this scattering prevention system.

Conventionally, a system for preventing scattering of crushed materials generated during demolition work of an existing building has been proposed (see Patent Document 1).
In Patent Document 1, four net holding portions arranged so as to project above the upper end of the building along the side surface of the building, and protection held by the four net holding portions to cover the upper surface of the building. A shatterproof device with a net is shown. The four net holders can move vertically with respect to the building independently of each other.

Patent Document 2 describes a building rubble shatterproof structure including a pillar fixed to the floor material on the top floor and the floor material on the lower floor of the building, and a shatterproof net provided above the pillar to cover the building. It is shown.
Patent Document 3 describes a curing sheet support column insertion hole arranged over the dismantling floor and its lower floor, and a curing sheet support inserted into the curing sheet support column insertion hole and projected upward from the dismantling floor. An upward shatterproof curing system comprising a pillar and a shatterproof curing sheet supported on the crown of the curing sheet support pillar is shown.

Japanese Unexamined Patent Publication No. 2011-017230 Japanese Unexamined Patent Publication No. 2019-127809 Japanese Unexamined Patent Publication No. 2019-183608

An object of the present invention is to provide an anti-scattering system and a method for dismantling an existing building, which can easily prevent the scattering of crushed substances when the existing building is demolished and can be appropriately raised and lowered as the demolition work progresses. ..

The present inventor provides through holes in a floor slab on the floor to be demolished and a plurality of floor slabs on the lower floor to be demolished as a shatterproof system for preventing the scattering of crushed substances when the existing building is demolished. Focusing on the point that the shatterproof system can be raised and lowered as the dismantling work progresses by inserting a support into the through hole and suspending and supporting this support with an elevating device. It led to the invention.
The scattering prevention system of the first invention (for example, the scattering prevention system 1 described later) is a scattering prevention system for preventing the scattering of crushed materials at the time of dismantling an existing building (for example, the existing building 2 described later). The floor slab (for example, the floor slab 3 described later) of the floor to be dismantled (for example, the nth floor described later) and the lower floor (for example, the (n-1) floor described later) of the existing building to be dismantled, (n-2). ) Floor slabs (for example, floor slabs 3A and 3B described later) are formed with through holes (for example, through holes 4, 4A and 4B described later), and the top is disassembled by being inserted through the through holes. A plurality of columns projecting upward on the target floor (for example, columns 20 described later) and a curing sheet extended between the tops of the plurality of columns (for example, a curing sheet 30 described later) are provided. The support column is characterized in that it moves up and down while being suspended and supported by an elevating device (for example, an electric chain block 40 described later) attached to a floor slab on the lower floor of the dismantling target floor.

According to the present invention, the tops of the plurality of columns are projected above the floor to be demolished, and the curing sheet is spread between the tops of the plurality of columns, so that the curing sheet covers the existing building from above. Scattering of crushed material is prevented when the existing building is demolished.
In addition, since an elevating device that suspends and supports the columns and elevates them is provided, the curing sheet can be smoothly elevated and lowered as the dismantling work progresses by driving the elevating device. At this time, since the support column is inserted through the through holes located at the top and bottom, the support column is guided by the through hole and moves, and the support column can be suppressed from falling.

In the shatterproof system of the second invention, the first through hole (for example, the floor slab 3A described later) is provided in the floor slab (for example, the floor slab 3A described later) immediately below the floor to be dismantled (for example, the (n-1) floor described later). , A through hole 4A) described later is formed, and a second floor slab (for example, the floor slab 3B described later) on a floor two layers below the floor to be dismantled (for example, the (n-2) floor described later) is formed. A through hole (for example, a through hole 4B described later) is formed, and the support column is inserted into the first through hole and the second through hole, and is provided in the first through hole to temporarily support the support column. A first temporary support device (for example, a temporary support device 50A described later) and a second temporary support device (for example, a temporary support device 50B described later) provided in the second through hole to temporarily support the support column. It is characterized by further preparing.

According to the present invention, the support column is temporarily supported by the first temporary support device in the first through hole provided in the floor slab on the floor directly below the floor to be demolished, and the floor slab on the second floor below the floor to be demolished is provided. A support column was temporarily supported in the provided second through hole by a second temporary support device. Therefore, since the stanchions are temporarily supported by the existing building at two points in the height direction, the stanchions can be held at a predetermined height position while suppressing the stanchions from collapsing.

The method of dismantling an existing building according to the third invention is a method of dismantling an existing building using the above-mentioned shatterproof system, and is a method of dismantling an existing building along a temporary wall (for example, a framework scaffold 10 described later) along the outer wall surface of the existing building. ) Is installed, and the plurality of columns are temporarily supported in the existing building by the plurality of temporary support devices, and in this state, between the tops of the plurality of columns and between the tops of the plurality of columns and the temporary installation. The first step of spreading the curing sheet between the top of the wall (for example, steps S1 to S3 described later), the second step of dismantling the dismantling target floor (for example, step S4 described later), and the temporary installation. While lowering the wall, the temporary support by the plurality of temporary support devices is released, and in this state, the support is lowered by the elevating device, and then the support is again attached to the existing building by the plurality of temporary support devices. The third step (for example, steps S5 and S6 described later) for provisionally supporting, and the second step and the third step are alternately repeated from the upper floor to the lower floor of the existing building (for example,). It is characterized by comprising step S7) described later.

According to the present invention, by spreading the curing sheet between the tops of the plurality of columns, the curing sheet covers the existing building from above, and the scattering of crushed material is prevented when the existing building is dismantled. In addition, as the dismantling work progresses, the curing sheet can be raised and lowered as appropriate to smoothly dismantle the existing building.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a shatterproof system and a method for dismantling an existing building, which can easily prevent the scattering of crushed substances when the existing building is demolished and can be appropriately raised and lowered as the demolition work progresses.

It is a side view of the existing building provided with the scattering prevention system which concerns on one Embodiment of this invention. FIG. 3 is a sectional view taken along the line AA of the shatterproof system of FIG. It is a flowchart of the dismantling method of the existing building using the scattering prevention system which concerns on embodiment. It is an explanatory diagram of the method of dismantling an existing building (Part 1: Situation during assembly of columns). It is an explanatory diagram of the method of dismantling an existing building (Part 2: The situation where the assembly of the columns is completed). It is an explanatory diagram of the method of dismantling an existing building (Part 3: A situation where a curing sheet is spread on a support). It is an explanatory diagram of the method of dismantling an existing building (Part 4: The situation where the existing building is dismantled with a demolition machine). It is an explanatory diagram of the method of dismantling an existing building (No. 5: The situation where the demolition machine is moved to the lower floor).

The present invention is a shatterproof system for preventing the scattering of crushed substances at the time of demolition of a building, and a method for dismantling an existing building using the shatterproof system. The shatterproof system is constructed by inserting columns into the through holes provided in the floor slabs on the floor to be demolished and the floor slabs on the lower floors of the existing building, and spreading the curing sheet on the tops of the columns. Will be done. According to the shatterproof system, when dismantling an existing building, the curing sheet can be moved to the lower floor by lowering the support column supporting the curing sheet with an elevating device as the dismantling work progresses.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of an existing building 2 provided with a shatterproof system 1 according to an embodiment of the present invention.
The scattering prevention system 1 prevents the scattering of crushed materials when the existing building 2 is demolished.
On the outside of the existing building 2, a framework scaffold 10 that can be raised and lowered as a temporary wall is installed along the outer wall surface of the existing building 2.
Further, a through hole 4 is formed in the floor slab 3 on the nth floor, which is the floor to be dismantled of the existing building 2, and the first floor slab 3A on the (n-1) floor, which is directly below the floor to be dismantled, has a first hole. A through hole 4A as a through hole is formed, and a through hole 4B as a second through hole is formed in the floor slab 3B on the floor (n-2), which is two layers below the floor to be dismantled. Further, a through hole 4C is formed in the floor slab 3C on the (n-3) floor, and a through hole 4D is formed in the floor slab 3D on the (n-4) floor.

The shatterproof system 1 includes a plurality of columns 20 that are inserted through at least through holes 4, 4A, and 4B and whose tops project above the nth floor, which is the floor to be dismantled, and between the tops of the plurality of columns 20 and the columns 20. A curing sheet 30 stretched between the top of the frame and the top of the framework scaffold 10, and an electric chain block 40 as an elevating device that raises and lowers the support 20 while suspending and supporting it from the floor slab 3A on the (n-1) floor. , A temporary support device 50A as a first temporary support device provided in the through hole 4A on the (n-1) floor to temporarily support the support column 20, and a support column 20 provided in the through hole 4B on the (n-2) floor. It is provided with a temporary support device 50B as a second temporary support device for temporarily supporting the above. Temporary support devices 50C and 50D are provided in the through holes 4C and 4D.
The support column 20 is formed by connecting a plurality of square support columns 21 having a predetermined length vertically.
The curing sheet 30 includes a plurality of wires 31 and a horizontal net 32 stretched between the wires 31.

FIG. 2 is a sectional view taken along the line AA of the shatterproof system 1 of FIG.
The temporary support device 50A includes four steel materials 51 assembled in a well girder on the floor slab 3A across the through holes 4A, and clamps 52 provided on these steel materials 51. The space surrounded by the four steel materials 51 assembled in the well girder has a rectangular opening 53, and the support column 20 is inserted through the opening 53. As a result, the temporary support device 50A has a guide function for guiding the ascending / descending of the support column 20. Further, by temporarily fixing the clamp 52 to the support column 20, the support column 20 is supported by the floor slab 3A on the (n-1) floor via the temporary support device 50A.
The temporary support devices 50B, 50C, and 50D also have the same structure as the temporary support device 50A.

Hereinafter, a method of dismantling the existing building 2 using the above-mentioned shatterproof system 1 will be described with reference to the flowchart of FIG.
In the initial state, as shown in FIG. 4, the framework scaffolding 10 is installed on the outside of the existing building 2. Further, an opening 5 is provided in the floor slab 3 on the nth floor, and the demolition machine 11 is moved from the opening 5 to the floor (n-1). A vertical net and a soundproof panel (not shown) are installed on the outer side surface of the frame scaffold 10.

In step S1, as shown in FIG. 4, the column 20 is assembled on the (n-2) floor of the existing building 2. Specifically, first, through holes 4, 4A to 4D are formed in the floor slabs 3, 3A to 3D from the nth floor to the (n-4) floor, and temporary support devices 50A to are formed in the through holes 4A to 4D. Place 50D. Further, the electric chain block 40 is attached to the through hole 4A of the floor slab 3A on the (n-1) floor. Next, the lowermost square support 21 is inserted into the opening 53 of the temporary support device 50B, and the lowermost square support 21 is suspended and supported by the electric chain block 40. Next, while driving the electric chain block 40 to lower the lowermost square support 21 and inserting it into the openings 53 of the temporary support devices 50C and 50D, another square support is placed on the lowermost square support 21. 21 are connected to form a support column 20. Then, the state shown in FIG. 5 is obtained.

In step S2, as shown in FIG. 6, the curing sheet 30 is spread on the support column 20 on the nth floor. Specifically, the electric chain block 40 is driven to raise the support column 20 so that the support column 20 protrudes from the floor surface of the nth floor by about 1 m. In this state, on the floor surface of the nth floor, a worker stretches a wire 31 between the tops of the columns 20 and between the tops of the columns 20 and the top of the framework scaffold 10, and between the wires 31. Expand the horizontal net 32.
In step S3, as shown in FIG. 1, the curing sheet 30 is set at a predetermined position. That is, the electric chain block 40 is driven to raise the support column 20 so that the curing sheet 30 protrudes from the floor surface of the (n-1) floor by about 10 m. In this state, the columns 20 are temporarily supported by the temporary support devices 50A and 50B.

In step S4, as shown in FIG. 7, the n-floor level and the (n-1) floor rising skeleton are dismantled by the demolition machine 11.
In step S5, as shown in FIG. 8, the framework scaffolding 10 is pushed down, and the floor slab 3A on the (n-1) floor is provided with an opening 5A by the demolition machine 11, and the demolition machine 11 is (n) from the opening 5A. -2) Move to the floor.
In step S6, the curing sheet 30 is lowered. That is, the temporary support of the support column 20 by the temporary support devices 50A and 50B is released, then the electric chain block 40 is driven to lower the support column 20, and the curing sheet 30 is 10 m from the floor surface of the (n-2) floor. Make it stand out to some extent. In this state, the columns 20 are temporarily supported by the temporary support devices 50B and 50C. After that, the electric chain block 40 attached to the through hole 4A on the (n-1) floor is replaced with the through hole 4B on the (n-2) floor, and the temporary support device 50A arranged in the through hole 4A is placed on the lower floor. Refill.
In step S7, the above steps S4 to S6 are repeated from the upper floor to the lower floor of the existing building 2.

According to this embodiment, there are the following effects.
(1) By projecting the tops of the plurality of columns 20 above the nth floor, which is the floor to be demolished, and extending the curing sheet 30 between the tops of the plurality of columns 20, the curing sheet 30 becomes the existing building 2. Is covered from above, so that the scattering of crushed materials is prevented when the existing building 2 is demolished.
Further, since the electric chain block 40 for suspending and supporting the support column 20 and raising and lowering it is provided, the curing sheet 30 can be smoothly raised and lowered as the dismantling work progresses by driving the electric chain block 40. At this time, since the support column 20 is inserted through the through holes 4, 4A and 4B located at the top and bottom, the support column is guided by the through holes 4, 4A and 4B and moves, and the support column 20 can be suppressed from falling.

(2) The support column 20 is temporarily supported by the temporary support device 50A in the through hole 4A provided in the floor slab 3A on the (n-1) floor, which is directly below the floor to be dismantled, and two layers below the floor to be dismantled. The support column 20 was temporarily supported by the temporary support device 50B in the through hole 4B provided in the floor slab 3B on the floor (n-2). Therefore, since the support column 20 is temporarily supported by the existing building 2 at two points in the height direction, the support column 20 can be held at a predetermined height position while suppressing the support column 20 from collapsing.

The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like to the extent that the object of the present invention can be achieved are included in the present invention.
In the above-described embodiment, the temporary support devices 50A to 50C are assembled on the floor slabs 3A to 3C across the through holes 4A to 4C in a well girder, and the clamps 52 provided on the steel materials 51. And, but it is not limited to this. That is, a holding device may be provided on the floor slab around the through hole, and the support column may be temporarily fixed by the arm material of the holding device.

1 ... Scattering prevention system 2 ... Existing building 3, 3A, 3B, 3C, 3D ... Floor slab 4, 4A, 4D ... Through hole 4B ... Through hole (first through hole) 4C ... Through hole (second through hole) 5 5, 5A ... Opening 10 ... Framework scaffolding (temporary wall) 11 ... Demolition machine 20 ... Strut 21 ... Square strut 30 ... Curing sheet 31 ... Wire 32 ... Horizontal net 40 ... Electric chain block (elevating device)
50A ... Temporary support device (first temporary support device) 50B ... Temporary support device (second temporary support device 50C, 50D ... Temporary support device 51 ... Steel material 52 ... Clamp 53 ... Opening

Claims (3)

It is a scattering prevention system that prevents the scattering of crushed materials when dismantling an existing building.
Through holes are formed in the floor slab on the floor to be demolished and the floor slab on the lower floor on the floor to be demolished in the existing building.
A plurality of columns that are inserted through the through hole and whose top protrudes above the floor to be demolished.
A curing sheet stretched between the tops of the plurality of columns is provided.
The support is a shatterproof system characterized by being suspended and supported by an elevating device attached to a floor slab on the lower floor of the dismantling target floor. A first through hole is formed in the floor slab on the floor directly below the floor to be demolished.
A second through hole is formed in the floor slab on the second floor below the floor to be demolished.
The column is inserted through the first through hole and the second through hole.
A first temporary support device provided in the first through hole to temporarily support the support column, and a first temporary support device.
The shatterproof system according to claim 1, further comprising a second temporary support device provided in the second through hole to temporarily support the support column. A method of dismantling an existing building using the shatterproof system according to claim 2.
A temporary wall is installed along the outer wall surface of the existing building, and the plurality of columns are temporarily supported in the existing building by the plurality of temporary support devices. In this state, between the tops of the plurality of columns. And the first step of spreading the curing sheet between the tops of the plurality of columns and the tops of the temporary wall, and
The second step of dismantling the dismantling target floor and
While lowering the temporary wall, the temporary support by the plurality of temporary support devices is released, and in this state, the support column is lowered by the elevating device, and then the support column is re-established by the plurality of temporary support devices. The third process of temporarily supporting the building and
A method for dismantling an existing building, comprising: a fourth step in which the second step and the third step are alternately repeated from the upper floors to the lower floors of the existing building.

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