JP7464177B2 - Anti-scattering device and anti-scattering method - Google Patents

Description

The present invention relates to a scattering prevention device and scattering prevention method that prevent objects, such as crushed materials when demolishing a building, from scattering outside the building.

When demolishing an existing building, debris generated during demolition may scatter outside the building. Therefore, in order to prevent debris from scattering outside the building, a protective net may be placed above the existing building (see, for example, Patent Document 1). The scattering prevention device described in this document is supported by the structural parts of the building and is positioned along the side of the building, protruding above the building, and includes four net supports that can expand and contract independently of one another, and a protective net that is held by the four net supports and covers the top surface of the building.

JP 2015-74956 A

When a building is demolished starting from the upper floors, the protective netting is also moved to the lower floors once the demolition of the upper floors is completed. In this case, removing the protective netting from the supports and then unfolding it again on the lower floors, attached to wires, is a heavy workload and takes a lot of time.

The scattering prevention device that solves the above problem is a scattering prevention device that prevents objects from scattering from a building to the outside, and includes a number of posts erected around the building, first and second pulleys arranged on the tops of the posts, a first wire that is stretched between the tops of opposing posts among the multiple posts via the first pulley, a protective net that is supported by the first wire and deployed, a second wire that is stretched between the tops of the posts opposing the protective net via the second pulley so as to abut against the underside of the protective net, and a tension adjustment device that adjusts the tension of the first wire and the second wire, and an attachment member is provided on the top of each of the posts, and the two first wires that hold adjacent protective nets are attached to the attachment member so that the ends of the adjacent protective nets overlap.

The scattering prevention method that solves the above problem is a scattering prevention method using a scattering prevention device that prevents scattering of objects from a building to the outside, and the scattering prevention device includes a plurality of posts erected around the building, first and second pulleys arranged on the tops of the posts, a first wire that is installed between the tops of opposing posts among the plurality of posts via the first pulley, a protective net that is supported and deployed by the first wire, and a protective net that is installed between the tops of the posts opposing the protective net via the second pulley so as to abut against the underside of the protective net. The system includes a second wire that is attached to the support pole and a tension adjustment device that adjusts the tension of the first wire and the second wire, and an attachment member is provided on the top of each of the posts, and the two first wires that hold adjacent protective nets are attached to the attachment member so that the ends of the adjacent protective nets overlap. The tension adjustment device is used to loosen the first wire and the second wire, and then the support pole is moved, and after all the support poles have been moved, the tension adjustment device is used to tension the first wire and the second wire.

The present invention makes it possible to effectively prevent objects from scattering outside during the demolition of a multi-storey building, etc.

1 is a front cross-sectional view of the upper part of a building in which a scattering prevention device is arranged according to an embodiment. FIG. 2 is a top view of a main part of a building in which a scattering prevention device according to an embodiment is installed. FIG. 2 is an enlarged top view of a main part of the anti-scattering device according to the embodiment. FIG. 4 is a schematic diagram illustrating the positional relationship between the net and wires of the anti-scattering device according to the embodiment. 1A is a left side view of a support pillar, FIG. 1B is a front view of the support pillar in FIG. 1A, and FIG. 1C is a right side view of a support pillar opposite to the support pillar in FIG.

Below, an embodiment of a scattering prevention device and scattering prevention method for use in demolishing a multi-story building will be described with reference to Figures 1 to 5. The scattering prevention device of this embodiment comprises multiple posts, two types of multiple wires installed on opposing posts, and multiple rectangular protective nets.

FIG. 1 is a front cross-sectional view of the upper part of the building to be demolished, FIG. 2 is a top view of the main parts of the building, FIG. 3 is an enlarged view of the area near the pillars in FIG. 2, and FIG. 4 is an explanatory diagram of the positional relationship between the protective net and the wires.
1, a plurality of scaffoldings 60 are arranged around a building 50 to be demolished. A plurality of supports 10, 20, 30, and 40 are arranged between the building 50 and the scaffoldings 60. These supports 10, 20, 30, and 40 support protective nets N1 and N2.
As shown in FIG. 4, the protection nets N1 and N2 are the same nets arranged with a vertical offset.
In this embodiment, as shown in FIG. 2, the upper part of a substantially rectangular parallelepiped building is covered with a plurality of protective nets N1 and N2.

The posts 10, 20, 30, and 40 shown in FIG. 3 have different ways of hanging the first wires W1u, W1d and the second wires W2u, W2d. The opposing posts 10 (30) and 20 (40) have shapes that are line-symmetrical with respect to the protective nets N1 and N2. In addition, the adjacent posts 10 (20) and 30 (40) have shapes that are line-symmetrical with respect to the central axes of the posts (10, 20, 30, and 40).

As shown in FIG. 2, a plurality of protective nets N1, N2 are arranged in the short side direction to cover the upper part of the building.
In this case, the protective net N1 is disposed above the protective net N2 so that the end regions of the adjacent protective nets N1, N2 overlap, as shown in Fig. 4. A loop is formed at the end of each protective net N1, N2, and the protective nets N1, N2 can be deployed by moving them along the first wires W1u, W1d by passing the first wires W1u, W1d through the loop.

In this embodiment, in FIG. 1, supports 10, 30 (20, 40) that support protective nets N1, N2 are installed at equal intervals on the sides of the building that is being demolished. In FIG. 1, supports 10, 30 are placed on the left side, and supports 20, 40 are placed on the right side, facing each other.

The posts 10, 20, 30, and 40 of the present embodiment are different only in the positions at which the pulleys are provided and the arrangement of the wires, and otherwise have the same configuration. Therefore, the same components are given the same reference numerals and detailed descriptions are omitted.
Then, the first wires W1u and W1d are suspended between the supports 10 and 20 (30 and 40). Ends of a pair of opposing protective nets N1 and N2 are deployed on each of the first wires W1u and W1d.

Fig. 5(a) is a left side view of the support pillar 10, Fig. 5(b) is a front view of the support pillar 10, and Fig. 5(c) is a left side view of the support pillar 20. Note that in Fig. 5(b), the pulley is omitted from the illustration.
5(a), the support 10 includes a column portion 11, a mounting column 12, and a mounting member 15. The mounting column 12 is fixed to the column portion 11 below the column portion 11, and has a length equivalent to about two and a half stories of a building.

As shown in FIG. 1, the mounting pole 12 is fixed to the building 50 by a bracket B1. In this embodiment, the mounting pole 12 is fixed at two locations on two floors of the building 50, but FIG. 1 shows only one location.

As shown in FIG. 3, the column portion 11 is made of H-shaped steel.
5A, a wire fixing portion 13 for fixing the ends of the first wire W1d and the second wire W2d is formed at the lower part of the pillar portion 11 of the pillars 10 and 30. In addition, a wire fixing portion 13 for fixing the ends of the first wire W1u and the second wire W2u is formed at the lower part of the pillar portion 11 of the pillars 20 and 40.
Furthermore, a tension adjusting device 14 is provided on the pillar portion 11 above the wire fixing portion 13. This tension adjusting device 14 is a wire tensioner, a lever block (registered trademark), or the like, and adjusts the tension of each wire (W1d, W1u, W2d, W2u) by changing the winding state of each wire (W1d, W1u, W2d, W2u).

An attachment member 15 is provided on the upper portion of the column portion 11 .
3, the mounting member 15 includes a mounting plate portion 15f and rib portions 15a, 15b, 15c, and 15d arranged in parallel. The mounting plate portion 15f is attached to the column portion 11. The rib portions 15a and 15d are provided at the end portions of the mounting plate portion 15f. The rib portions 15b and 15c are disposed toward the center near the rib portions 15a and 15d, respectively.

Furthermore, as shown in FIG. 5(b), shackles 17, 18 are attached to the rib portions 15a to 15d, respectively. The shackles 17, 18 are arranged at different heights. Specifically, the shackle 17 is attached to the upper region of the rib portions 15b, 15d, and bridges the first wire W1u and second wire W2u of the protective net N1 arranged above. The shackle 18 is attached to the lower region of the rib portions 15a, 15c, and bridges the first wire W1d and second wire W2d of the protective net N2 arranged below.

As shown in Figures 3 and 5(a), the ends of the first wire W1u and the second wire W2u are fixed to the shackles 17 of the pillars 10 and 30. Pulleys 18a and 18b are attached to the shackles 18 of the pillars 10 and 30. The pulley 18a is the first pulley, and supports the first wire W1d from the wire fixing part 13 at the top of the pillars 10 and 30 so that it faces the opposing pillars 20 and 40. Furthermore, the pulley 18b is the second pulley, and supports the second wire W2d from the wire fixing part 13 at the top of the pillars 10 and 30 so that it faces the adjacent pillars 40 and 20.

As shown in Figures 3 and 5(c), pulleys 17a and 17b are attached to the shackles 17 of the posts 20 and 40. The pulley 17a is a first pulley that supports the first wire W1u from the wire fixing part 13 at the top of the posts 20 and 40 so that it faces the opposing posts 10 and 30. Furthermore, the pulley 17b is a second pulley that supports the second wire W2u from the wire fixing part 13 at the top of the posts 20 and 40 so that it faces the adjacent posts 10 and 30.

As shown in FIG. 2, the two second wires W2u (W2d) are attached to the posts 10, 20, 30, and 40 so as to cross below the protective net N1 (N2). Specifically, one end of the second wire W2u (W2d) is fixed to the post 10, 20, 30, and 40, and the other end is fixed to the opposing adjacent post (40, 30, 20, and 10).

(How to install anti-scattering devices)
Next, a method for installing the anti-scattering device configured as above will be described.
As shown in Fig. 2, the pillars 10, 20, 30, 40 are arranged to face each other between the building 50 and the scaffolding 60 around the building. In this case, the mounting columns 12 of the pillars 10, 20, 30, 40 are fixed to the top floor of the building and the floor immediately below via brackets B1. Then, the first wires W1u attached to the shackles 17 of the pillars 10, 30 are fixed in a loosened state to the wire fixing parts 13 of the pillars 20, 40 via the pulleys 17a and tension adjustment devices 14 of the pillars 20, 40. In this case, the multiple first wires W1u to which the protective net N1 is attached are arranged in sequence.

Then, the multiple second wires W2u, whose ends are attached to the shackles 17 of the posts 10, 20, 30, and 40, are fixed in a loosened state to the wire fixing portion 13 in sequence via the pulleys 17b of the posts 20 and 40 and the tension adjustment device 14.
Thereafter, the tension adjusting devices 14 of the posts 20 and 40 are operated to tension the first wires W1u. Furthermore, the protective net N1 is deployed along the first wires W1u. Next, the tension adjusting devices 14 of the posts 20 and 40 are operated to tension the second wires W2u. As a result, the crossed second wires W2u come into contact with the vicinity of the center of the protective net N1, and push up the protective net N1.

Next, the lower first wire W1d, the second wire W2d, and the protective net N2 are attached in the same manner as the upper first wire W1u, the second wire W2u, and the protective net N1 described above. As a result, the protective net N2 is deployed along the first wire W1d, and the crossed second wire W2d abuts against the vicinity of the center of the protective net N2, pushing up the protective net N2. In this case, the ends of the protective nets N1 and N2 are arranged overlapping each other, so that the protective nets N1 and N2 can be installed without any gaps.
In this state, heavy machinery (such as a shovel or a crane) is operated under the protective nets N1 and N2 to demolish the building 50.

Then, the upper part of the building 50 is dismantled, the heavy machinery is lowered to the lower floor, and the scattering prevention device is replaced.
In this case, the tension adjusting device 14 of the pillars 10, 20, 30, 40 is operated to loosen the second wires W2u, W2d and the first wires W1u, W1d. Next, the fixing of the mounting pillars 12 of the pillars 10, 20, 30, 40 is released one by one. Then, the protection nets N1, N2 deployed along the first wires W1u, W1d are moved toward the pillars (10, 20, 30, 40) to create a gap. From this gap, the boom of one crane under the protection nets N1, N2 is protruded, and one of the pillars 10, 20, 30, 40 is lowered by this crane while hanging it, and the mounting pillar 12 is fixed to the floor one floor below. Then, a series of operations from the fixing release of the mounting pillar 12 to the installation of the mounting pillar 12 to the floor one floor below is repeated for all the pillars 10, 20, 30, 40 in sequence.

After all the pillars 10, 20, 30, 40 are fixed to the floor one floor below, the tension adjustment devices 14 of the pillars 10, 20, 30, 40 are operated to tension the first wires W1u, W1d to deploy the protective nets N1, N2, and then the second wires W2u, W2d are tensioned. This causes the second wires W2u, W2d to push up the protective nets N1, N2 again. Then, dismantling work is carried out on this floor.

(Action)
According to the scattering prevention device having the above-mentioned configuration, the second wires W2u, W2d are arranged to abut against the lower surfaces of the protective nets N1, N2. The lower surfaces of the protective nets N1, N2 are pushed up by the second wires W2u, W2d, thereby preventing the protective nets N1, N2 from sagging.

Furthermore, according to the above-described scattering prevention method, the scattering prevention device can be moved from an upper floor to a lower floor by loosening the first wires W1u, W1d and the second wires W2u, W2d without removing the protective nets N1, N2 from the pillars 11.

According to this embodiment, the following effects can be obtained.
(1) The scattering prevention device of this embodiment includes the second wires W2u, W2d that contact the lower surfaces of the protective nets N1, N2, so that the second wires W2u, W2d push up the protective nets N1, N2 from below. This prevents the protective nets N1, N2 from sagging, and divides the space within the protective nets N1, N2 into large sections, allowing for efficient dismantling work.

Furthermore, tension adjustment devices 14 for adjusting the tension of the wires (W1u, W1d, W2u, W2d) are provided on the posts 10, 20, 30, 40. As a result, after loosening the wires (W1u, W1d, W2u, W2d), the posts 10, 20, 30, 40 are lowered and fixed on the lower floor, and the wires (W1u, W1d, W2u, W2d) are tensioned. This allows the protective nets N1, N2 to be moved from the upper floors to the lower floors without being removed.

(2) In this embodiment, the second wires W2u (W2d) are attached to the posts 10, 20, 30, 40 so that the two second wires W2u (W2d) cross. This positions the intersection of the second wires W2u (W2d) near the center of the protective net N1 (N2), so that the protective net N1 (N2) can be pushed up and the sagging of the protective net N1 (N2) can be suppressed.

(3) In this embodiment, pulleys 18a, 18b are provided on the shackles 18 of the posts 10, 30 to engage the wires (W1d, W2d) associated with the protective net N2 located on the lower side, and pulleys 17a, 17b are provided on the shackles 17 of the posts 20, 40 to engage the wires (W1u, W2u) associated with the protective net N1 located on the upper side. This makes it possible to suppress interference between the pulleys 17a, 17b, 18a, 18b provided on the shackles 17, 18.

(4) In this embodiment, the mounting members 15 of the posts 10, 20, 30, 40 hold two first wires W1u, W1d that hold different protective nets N1, N2, and the first wires W1u, W1d are positioned so that the protective nets N1, N2 overlap partially. This allows adjacent protective nets N1, N2 to be attached without any gaps.

(5) In this embodiment, the wires (W1u, W1d, W2u, W2d) are held at the top of the posts 10, 20, 30, 40 by the pulleys 17a, 17b, 18a, 18b and the shackles 17, 18. As a result, even if the wires (W1u, W1d, W2u, W2d) are loosened, the wires (W1u, W1d, W2u, W2d) are held by the pulleys 17a, 17b, 18a, 18b, so that sagging of the wires (W1u, W1d, W2u, W2d) when loosened can be suppressed.

This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction.
In the above embodiment, the wires (W1u, W1d, W2u, W2d) are attached to the pulleys 17a, 17b, 18a, 18b attached to the posts 10, 20, 30, 40. The holding members that hold the wires (W1u, W1d, W2u, W2d) at the upper part of the pillar portion 11 are not limited to the pulleys 17a, 17b, 18a, 18b, and may be, for example, ring-shaped members through which the wires are inserted.

- In the above embodiment, the two second wires W2u, W2d are attached to the posts 10, 20, 30, 40 so that they cross near the center of the protective nets N1, N2. The arrangement of the second wires W2u, W2d is not limited to this, and for example, one second wire W2u, W2d may be abutted against the lower part of the protective nets N1, N2.

- Each of the pillars 10, 20, 30, 40 in the above embodiment includes a column portion 11 to which an attachment member 15 having ribs 15a-15d for attaching the wires (W1u, W1d, W2u, W2d) is attached. The configuration of each of the pillars 10, 20, 30, 40 is not limited to a configuration including an attachment member 15 having ribs 15a-15d, as long as the wires (W1u, W1d, W2u, W2d) can be engaged with the upper portion of the pillar portion 11. For example, the attachment member for attaching the first wires W1u, W1d and the attachment member for attaching the second wires W2u, W2d may be provided separately on the pillars 10, 20, 30, 40.

- In the above embodiment, pulleys 17a and 17b are provided on the shackles 17 of the mounting members 15 of the posts 20 and 40 aligned on the right side of Fig. 2, and pulleys 18a and 18b are provided on the shackles 18 of the mounting members of the posts 10 and 30 aligned on the left side of Fig. 2. The mounting arrangement of the pulleys 17a, 17b, 18a, and 18b on the mounting member 15 is not limited to these and may be changed depending on the arrangement of the protective nets N1 and N2, etc.

Next, the technical ideas that can be understood from the above-described embodiment and other examples will be described below together with their effects.
(a) a mounting member is provided on the upper portion of each support;
The attachment member holds two of the first wires,
The two first wires carry different safety nets;
3. The scattering prevention device according to claim 1, wherein the first wire is attached to the mounting member so that parts of the different protective nets overlap each other.
Therefore, according to the invention described in (a), adjacent protective nets can be arranged without any gaps.

B1...bracket, N1, N2...protective net, W1u, W1d...first wire, W2u, W2d...second wire, 10, 20, 30, 40...support, 11...pillar section, 12...mounting column, 13...wire fixing section, 14...tension adjustment device, 15...mounting member, 15a, 15b, 15c, 15d...rib section, 15f...mounting plate section, 17, 18...shackle, 17a, 18a...pulley as first pulley, 17b, 18b...pulley as second pulley, 50...building, 60...scaffolding.

Claims (2)

A scattering prevention device that prevents objects from scattering from a building to the outside,
A plurality of pillars erected around the building;
First and second pulleys arranged on the upper part of the support pole;
a first wire that is stretched between upper portions of opposing columns among the plurality of columns via the first pulley;
A protective net supported by the first wire and deployed;
A second wire is installed between the upper parts of the posts facing the safety net via the second pulley so as to abut against the lower surface of the safety net;
a tension adjusting device for adjusting tension of the first wire and the second wire,
An attachment member is provided on the upper portion of each of the pillars,
A scattering prevention device characterized in that the two first wires, which respectively hold adjacent protective nets, are attached to the mounting member so that the ends of the adjacent protective nets overlap. A method for preventing scattering of objects using a scattering prevention device for preventing scattering of objects from a building to the outside, comprising the steps of:
The shatter prevention device is
A plurality of pillars erected around the building;
First and second pulleys arranged on the upper part of the support pole;
a first wire that is stretched between upper portions of opposing columns among the plurality of columns via the first pulley;
A protective net supported by the first wire and deployed;
A second wire is installed between the upper parts of the posts facing the safety net via the second pulley so as to abut against the lower surface of the safety net;
a tension adjusting device for adjusting tension of the first wire and the second wire,
An attachment member is provided on the upper portion of each of the pillars,
The two first wires each holding an adjacent pair of safety nets are attached to the mounting member such that ends of the adjacent safety nets overlap each other;
Using the tension adjusting device, the first wire and the second wire are loosened, and then the support is moved;
A method for preventing scattering, comprising the steps of: after all of the supports have been moved, tensioning the first wire and the second wire using the tension adjustment device.