JP7133444B2 - mesh sheet - Google Patents

Description

The present invention relates to a mesh sheet used in building construction.

The mesh sheet is attached to a scaffolding assembly placed around a building under construction so as to face the wall of the building. It works to prevent scattering to.

Incidentally, at construction sites, a phenomenon may occur in which a scaffolding assembly collapses during strong winds or temporary gusts of wind. It is known that this phenomenon is caused by wind that flows between the mesh sheet and the wall of the building exerting a force (wind force) that tends to separate the mesh sheet from the scaffolding assembly. In addition, it is known that the wind force received by the mesh sheet is large in the vicinity of the corners of the building, particularly in the corners and in the range of two spans of the scaffolding assembly in the horizontal direction from the corners. ing. In the past, it has been proposed to use protective sheets provided with ventilation openings in order to prevent the scaffold assembly from collapsing.

JP 2017-2552 A

SUMMARY OF THE INVENTION In view of the conventional circumstances, the present invention provides a mesh sheet that contributes to the prevention of collapse of a scaffolding assembly in the event of strong winds or gusts.

The present invention relates to a mesh sheet attached to a scaffolding assembly installed for construction of a building so as to face one wall defining two corners of said building. The mesh sheet has a first region consisting of two side portions and an upper portion extending in a gate shape, and a second region surrounded by both side portions and an upper portion of the first region. The fill factor of the area is smaller than the fill factor of the second area. At least one of both side portions of the first region of the mesh sheet faces the one wall surface in the vicinity of at least one of the two corner portions of the building, and is located above one wall surface of the building. In the present invention, the term "filling rate" refers to the ratio of the actual area of the net expressed by (filling rate=actual area of net/surface area of net).

The mesh sheet according to the present invention is attached to the scaffolding assembly, and functions to prevent workers, materials, tools, etc. on the scaffolding assembly from falling and scattering to the surroundings, as in the conventional case. The mesh sheet attached to the scaffolding assembly has at least one of both side portions of the first region of one of the building's two corners near at least one of the building's two corners. It faces a wall and its upper part is located above one wall of said building.

In the present invention, the filling rate of the first region of the mesh sheet is smaller than the filling rate of the second region. Thus, said first region has a larger mesh than that of said second region. For this reason, the passage amount of the wind that has flowed between the mesh sheet and the scaffolding assembly in the first region is made larger, so that the mesh sheet near the corners of the building will pass through. It is possible to reduce the wind force acting particularly strongly and the wind force acting on the upper part of the mesh sheet. This is advantageous in preventing the scaffolding assembly from collapsing during strong winds or gusts of wind.

Each side of the first area may have a width dimension at a distance of two spans of the scaffolding assembly from a corner of the building. Further, the filling rate of the first region and the filling rate of the second region are the wind force coefficient in the first region and the second region when the mesh sheet attached to the scaffolding assembly receives wind force. 2, C ₁ and C ₂ respectively, the relationship represented by the equation {C ₁ × filling rate of the first region)=C ₂ × filling rate of the second region} can have.

1 is a schematic perspective view showing four mesh sheets placed opposite four walls of a building under construction; FIG. 1 is a schematic plan view showing two mesh sheets placed facing each other on two walls adjacent to each other of a building under construction; FIG. 1 is a plan view of one mesh sheet arranged to face one wall surface of a building under construction; FIG. 1 is an elevational view of one of two mesh sheets placed opposite portions of two adjacent wall surfaces of a building under construction; FIG. Figure 5 is a schematic plan view of the two mesh sheets shown in Figure 4; 1 is a plan view of one mesh sheet placed on part of one wall of a building under construction; FIG.

Referring to FIG. 1, a building 10, for example, made of reinforced concrete, which is under construction, four scaffolding assemblies 12 installed so as to surround the building 10 for construction of the building 10, and these scaffolding assemblies. Four mesh sheets 14 according to the present invention are shown each attached to a solid 12, for example using ropes or wires (not shown), and connected together.

The illustrated building 10 has an overall rectangular planar shape. The illustrated building 10 has four rectangular wall surfaces 16 and a roof surface 18 connected to these wall surfaces 16 . Additionally, the illustrated building 10 has four corners 20 . Each corner 20 is formed by two wall surfaces 16 adjacent to each other, and each wall surface 16 defines two corner portions 20 at its two horizontal ends.

The scaffold assembly 12, in the illustrated example, consists of a plurality of framework scaffolds assembled vertically and horizontally, and has a generally rectangular elevational shape. Each scaffolding assembly 12 is fixed to ten walls 16 of the building, facing each wall 16 and having an upper part 12a extending above the roof 18 of the building 10. As shown in FIG.

The illustrated mesh sheet 14 is made of a synthetic resin material such as polyester. Also, each mesh sheet 14 has a rectangular elevational shape when viewed in the state shown in FIG.

Mesh sheet 14 has a first region 22 and a second region 24 . The first region 22 consists of two side portions 26, 28 and an upper portion 30 extending in a gate shape. Both side portions 26 and 28 each have a rectangular shape and elongate in the vertical direction as viewed in FIG. An upper portion 30 connected to both side portions 26 and 28 has a rectangular shape as viewed in FIG. 1, and elongates horizontally above the side portions 26 and 28 .

On the other hand, the second area 24 is surrounded by the first area 22 . More specifically, the second region 24 has a rectangular shape, is surrounded by the sides 26 , 28 and the top 30 of the first region 22 and continues to the sides 26 , 28 and the top 30 .

Each mesh sheet 14 has height and width dimensions (horizontal length) that are slightly longer than the height and width dimensions (horizontal length) of the scaffolding assembly 12 . Each mesh sheet 14 faces the upper portion 12a of each scaffolding assembly 12 at the upper portion 30 of the first region 22 and the first mesh sheet 14, viewed in its attached state to each scaffolding assembly 12 in FIG. Sides 26 , 28 and second region 24 of region 22 face the rest of each scaffolding assembly 12 , excluding upper portion 12 a , and each wall 16 of building 10 .

Each mesh sheet 14 is arranged such that both sides 26 , 28 of its first region 22 face each other near two corners 20 defined by each wall 16 of the building 10 . Preferably, the sides 26, 28 each have a width dimension that is two spans (2s) of the scaffolding assembly 12 horizontally from the corners 20 and vertically within this width dimension. It extends and faces the wall surface 16 of the building 10 . Here, 1 span (1 s) means the horizontal length of one framework scaffold that constitutes the scaffold assembly 12, for example, the length corresponding to 1800 mm. In the vicinity of the corner 20, particularly in the area between the corner 20 and a distance corresponding to two spans of the scaffolding assembly 12 in the horizontal direction from the corner, the scaffolding assembly 12 is It is believed that the attached mesh sheet 14 is subjected to particularly strong wind forces.

The first region 22 has a smaller fill factor than the second region 24 . Therefore, the mesh size of the first region 22 is larger than the mesh size of the second region 24 . The magnitude of the solidity factor of the first area 22 and the magnitude of the solidity factor of the second area 24 can be determined in consideration of the assumed wind strength.

For example, it is possible to consider the negative wind force factor acting on the mesh sheet recommended in the “Revised Safety Technical Guideline for Scaffolding against Wind Load (Japan Temporary Construction Industry Association)” (hereinafter simply referred to as the “Guideline”). can. In the "Guideline", the wind coefficient C ₁ for the part of the mesh sheet that faces the vicinity of the corner of the building and the part that extends upward beyond the roof surface of the building, and the rest are C ₁ =−1.3 and C _{2 =} −0.8, respectively. The part of the mesh sheet and the other remaining part are respectively the sides 26, 28 and top 30 of the first region 22 of the mesh sheet 14 and the second region of the mesh sheet 14 according to the present invention. 24.

In addition, the filling rate of the first region 22 and the filling rate of the second region 24 of the mesh sheet 14 are obtained by the equation {wind force coefficient (C ₁ =-1.3) of the first region 22 × first region 22 fill factor)=wind force coefficient of second region 24 (C ₂ =−0.8)×fill factor of second region}. According to this, when the filling rate of the second area 24 is set to 70%, for example, the filling rate of the first area 22 is set to about 43%. This also eliminates differences in the effects of wind forces between the first and second regions 22,24.

In the present invention, as described above, the solidity rate of the first region 22 of the mesh sheet 14 is smaller than the solidity rate of the second region 24, and the mesh size of the first region 22 is the second size. larger than the mesh size of region 24. As a result, the amount of air flowing between the mesh sheet 14 and the scaffolding assembly 12 can be increased through the first region 22 . As a result, the wind force acting on the mesh sheet 14 particularly strongly in the vicinity of the corners 20 of the building and the wind force acting on the upper portion 30 of the mesh sheet 14 can be reduced.

Instead of the example of FIG. 1 in which the four mesh sheets 14 are arranged to face each of the four walls 16 of the building 10, any wall on which the scaffold assembly 12 is installed, as shown in FIGS. 16.

In the example shown in FIG. 2, two scaffolding assemblies 12 are installed along two wall surfaces 16 of the building 10 adjacent to each other, and two mesh sheets 14 are installed respectively facing the two wall surfaces 16 of the building 10. are arranged to

In the example shown in FIG. 3, a scaffolding assembly 12 is installed and attached along a wall 16 of building 10 .

4 and 5, two scaffold assemblies 12A and 12B are installed along two wall surfaces 16A and 16B adjacent to each other of the building 10, and two mesh sheets 14A and 14B are installed. are arranged so as to face portions of the two wall surfaces 16A and 16B, respectively.

In the example shown in FIGS. 4 and 5, only one side portion 26 of the side portions 26 and 28 of the first region 22 of the mesh sheet 14A has two corner portions (reference numerals 20A and 20B for distinction). and 20A, 20C.) in the vicinity of one corner 20A, and the other side 28 of the mesh sheet 14A is not in the vicinity of the corner 20B, that is, the corner It faces the wall surface 16A at a location away from 20B (for example, a location at a distance of two spans or more toward the corner 20A). Also, only one side portion 28 of the side portions 26 and 28 of the first region 22 of the mesh sheet 14B faces the vicinity of one corner portion 20A, and the other side portion 26 of the mesh sheet 14B faces the wall surface 16A at a location not near the corner 20C, that is, at a location away from the corner 20C (for example, at a location at least two spans away from the corner 20A).

Also, only one mesh sheet 14A out of the two mesh sheets 14A and 14B shown in FIGS. 4 and 5 can be arranged (see FIG. 6).

In the example shown in FIG. 6, a scaffolding assembly 14A is installed along a portion of the wall surface 16A, which is one wall surface of the two wall surfaces 16A and 16B shown in FIGS. are arranged to face the part of the wall surface 16A. Instead of the illustrated example, a scaffolding assembly (not shown) is installed along part of the other wall surface 16B, and one mesh sheet (not shown) is placed facing part of the wall surface 16B. can be placed in

10 building 12 scaffolding assembly 14 mesh sheet 16 building wall 20 building corner 22 mesh sheet first region 24 mesh sheet second region 26, 28 first region side 30 first region top of

Claims (3)

A mesh sheet attached to a scaffolding assembly installed for construction of a building so as to face one wall defining two corners of said building, comprising:
The mesh sheet has a first region consisting of two side portions and an upper portion extending in a gate shape, and a second region surrounded by both side portions and an upper portion of the first region. has a first region and a second region in which the filling rate of is smaller than the filling rate of the second region;
At least one of both side portions of the first region of the mesh sheet faces the one wall surface in the vicinity of at least one of the two corner portions of the building, and A mesh sheet positioned so that the top of the area of is located above one wall of said building. 2. The mesh sheet of claim 1, wherein each side of said first region has a width dimension at a distance of two spans of said scaffolding assembly from a corner of said building. The fill factor of the first area and the fill factor of the second area are the wind force coefficient in the first area and the second area when the mesh sheet attached to the scaffolding assembly receives wind force. When the wind coefficients in the regions are C ₁ and C ₂ , respectively, the relationship shown by the equation {C ₁ × fullness of the first region) = C ₂ × fullness of the second region} The mesh sheet according to claim 1 or 2.

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