JP7201957B1 - Scaffold member for indoor work and scaffold using the same - Google Patents

Abstract

A scaffolding member for indoor work that does not easily collapse even when stacked as a scaffolding is provided. A scaffolding member (10) comprising a rectangular parallelepiped main body (11) and a coating layer (12) provided on the surface thereof. The main body 11 is made of a solid foamed resin molding. The coating layer 12 is provided on all surfaces of the main body 11 . The coating layer 12 is made of nonflammable synthetic resin. A scaffold 1 for indoor work is assembled by stacking two or more scaffold members 10. - 特許庁[Selection drawing] Fig. 1

Description

The present invention relates to a scaffolding member for indoor work and a scaffolding using the scaffolding member by stacking two or more of them.

Work such as ceiling cleaning and lighting replacement in a building is performed by assembling scaffolding in the building. Such a scaffolding is generally assembled by assembling square tubular materials or square bars made of metal such as aluminum as pillars or crosspieces, and then fixing the floor materials to the pillars or crosspieces.
However, when metal scaffolding is assembled on the floor of a building or the like, the total weight of the scaffolding increases, and there is a risk of damage to the floor. In particular, since the total weight of the scaffolding is concentrated on the pillars, the floor around the pillars is likely to be dented and damaged. Older wooden buildings require extra care. Currently, repair work for shrines and temples designated as important cultural properties is carried out by dismantling floors and building scaffolding on the ground.

On the other hand, Patent Documents 1 and 2 are known as scaffolding for indoor work.
Patent Document 1 discloses a footstool that is stacked to form a scaffold for indoor work, and is composed of a base material made of foamed resin in the shape of a rectangular parallelepiped and a bag body that houses the base material, and the bag body is provided with a connecting member. A step ladder is disclosed.
Patent Literature 2 discloses a scaffold comprising two support members in which members made of expanded polystyrene are stacked and a floor member bridged between the support members.
Since the scaffolds of Patent Documents 1 and 2 are made by stacking rectangular parallelepiped members, the total weight is supported by the surface in contact with the floor, unlike conventional scaffolds, where the legs (columns) support the total weight. Therefore, the force can be distributed and the burden on the floor can be reduced. Moreover, since each member is made of foamed resin such as polystyrene foam, the total weight can be reduced.

Japanese Utility Model Laid-Open No. 3-33142 JP 2011-80333 A

However, in indoor work, workers move back and forth on the upper surface of a scaffold constructed by stacking members, and it is necessary to prevent the stacked members from collapsing. In order to increase the working area, it is necessary to arrange the members not only vertically but also horizontally, and the strength of the connection between the vertically adjacent members is important, as well as the strength of the connection between the vertically adjacent members. Furthermore, foamed resin moldings such as expanded polystyrene have lower strength than resin moldings, particularly at corners, and thus corners and the like may be chipped during use.
In Patent Document 1, since a connecting member is provided in a bag containing a base material, when an external force is applied to each step, the stress is applied to the connecting member, which is a connecting portion, and the bag to which the connecting portion is attached is removed. There is a risk that the stacked step stools may collapse due to the tearing of the connecting members or the breakage of the connecting members themselves. In addition, this bag does not prevent chipping of corners of the base material during use.
Patent document 2 also fixes each member from the outside with an adhesive tape or the like. Therefore, as in Patent Document 1, when an external force is applied, the stress is applied to each tape, and there is a risk that the tape will tear and the stacked steps will collapse. Also, this scaffolding is likely to chip off the corners of each support member as it is used.
In particular, the repair work of temples, shrines, and the like takes a long period of half a year or more, so scaffolding that can be used for a long period of time is required.
The present invention has been researched and developed in view of such circumstances, and an object of the present invention is to provide a highly durable scaffolding member for indoor work that does not collapse easily even when scaffolding is piled up.

The scaffold member of the present invention is a scaffold member for stacking two or more to form a scaffold for indoor work, comprising a foamed resin molding having parallel upper and lower surfaces and a coating layer provided on the surface. It is characterized by having
Since the scaffolding members of the present invention exhibit a three-dimensional structure with parallel upper and lower surfaces, two or more can be stacked one on top of the other. In addition, since the scaffold member of the present invention uses foamed resin moldings, the weight of each scaffold member can be reduced. Furthermore, since the scaffold member of the present invention has a coating layer on the surface of the foamed resin molded article, the tackiness (adhesiveness) of the coating layer causes, for example, a predetermined force to be applied to the stacked scaffold members. By aligning the scaffolding members together, the scaffolding members can be connected so as not to be displaced from each other. Further, since the coating layer is integrated with the surface of the foamed resin body, it prevents the corners of the foamed resin molded body from chipping due to use. Therefore, the scaffolding assembled with the scaffolding member of the present invention has high durability and does not collapse easily.

Preferably, the scaffolding member of the present invention, wherein said coating layer is non-combustible. By imparting noncombustibility to the coating layer, it does not burn in the event of a fire, so it is suitable for indoor scaffolding to be installed for a long period of time. In particular, it is preferable for repair work of important cultural properties such as shrines and temples. Moreover, in that case, it is preferable to make the foamed resin molding flame-retardant.
In the scaffolding member of the present invention, it is preferable that the coating layer is made of a synthetic resin having an elongation of 25% or more. By setting the elongation percentage to 25% or more, the tackiness (adhesiveness) becomes stronger, and the stacked scaffolding members can be further strongly connected to each other.
Preferably, in the scaffolding member of the present invention, the foamed resin molding is made of expanded polystyrene, and the coating layer is made of polyurethane, polyurea, or polyurethaneurea.

A first aspect of the scaffolding of the present invention is a scaffold assembled by stacking a plurality of scaffolding members of the present invention, and is characterized by having a floor plate on the upper surface. By providing the floor board on the upper surface in this way, it is possible to eliminate inconveniences such as stumbling due to sticking of scaffolding members.
A second aspect of the scaffolding of the present invention is a scaffold assembled by stacking a plurality of scaffolding members of the present invention, and is characterized in that a railing is provided on the upper surface. By providing the fence in this way, workers can work with peace of mind.

The scaffolding member for indoor work of the present invention is lightweight and can be connected so that the scaffolding members do not shift when stacked vertically. In addition, corners and the like are less likely to be chipped by use. Therefore, the scaffolding assembled with the scaffolding member of the present invention is less likely to damage the floor of the building or the like, is less likely to collapse, and is safer for workers. In particular, the scaffolding of the present invention can be preferably used for repairing temples, shrines, etc., for which the work period is longer than half a year.

1a and 1b are respectively a perspective view and a cross-sectional view taken along the line XX showing a first embodiment of the scaffolding member of the present invention, FIG. 1c is a perspective view of the scaffold assembled by the scaffolding member, and FIG. Furthermore, it is a perspective view of the scaffold which provided the fence. Figures 2a, 2b and 2c are perspective views of second, third and fourth embodiments of the scaffolding member of the present invention, respectively; Figure 2d is a perspective view of the scaffolding members of Figure 2b and a scaffold assembled by the scaffolding members of Figure 2c;

Next, embodiments of the present invention will be described with reference to the drawings. In addition, the present invention is not limited to the following embodiments.

[Scaffold member 1]
The scaffold member 10 of FIG. 1a comprises a rectangular parallelepiped main body 11 and a coating layer 12 provided on the surface thereof.
The upper limit of the weight of the scaffold member 10 is, for example, 40 kg or less, 30 kg or less, 25 kg or less, and particularly 20 kg or less. If the weight of the scaffold member 10 is more than 40 kg, it will be difficult for a worker to carry it alone, and it will be difficult to assemble it without heavy machinery. On the other hand, it is preferable that the weight is light. Therefore, the lower limit of the weight of the scaffold member 10 is preferably 5 kg or more, for example.
The lower limit of the height of the scaffold member 10 is 20 cm or more, 30 cm or more, and particularly 35 cm or more. This is because if the height is too low, it is necessary to increase the number of stacked stages. On the other hand, considering ease of stacking, the upper limit of the height is 100 cm or less. When the scaffolding member 10 has a rectangular parallelepiped shape, a rectangular parallelepiped whose height and width are smaller than each other, particularly a flat rectangular parallelepiped whose height is 1/2 or less of both length and width is preferable. For example, a rectangular parallelepiped of length 100 cm×width 200 cm×height 40 cm can be used.

[Body 11]
The main body 11 is made of a solid foamed resin molding. A foamed resin molded article is molded from a raw material containing a synthetic resin and a foaming agent, and is molded by foaming the foaming agent with heat or the like.
Synthetic resins used as raw materials for foamed resin moldings include polyurethanes, polystyrenes, polyolefins, and the like. In particular, polystyrene (expanded polystyrene) has self-extinguishing properties and is preferable in terms of strength. In this case, for example, expanded polystyrene (EPS) is preferred.
It is preferable to mix a flame retardant or a non-combustible agent with the raw material of the foamed resin molded article so that the foamed resin molded article has flame retardancy or non-combustibility. As a result, it is less likely to burn or does not burn even in the event of a fire, making it suitable for indoor scaffolding to be installed for a long period of time. In particular, when polystyrene is used as the foamed resin molding, it is preferable to add a flame retardant to impart flame retardancy. Furthermore, other additives may be added to the raw material of the foamed resin molded article to the extent that the effect of the present invention is not impaired.

[Physical properties of foamed resin molding]
The density of the foamed resin molding is 50 kg/m ³ or less, 30 kg/m ³ or less, preferably 25 kg/m ³ or less, and particularly preferably 20 kg/m ³ or less. A lower density is preferable for weight reduction, but a density of less than 10 kg/m ³ is not realistic in consideration of strength.
The expansion ratio of the foamed resin molding is 20 times or more, preferably 50 times or more, and particularly preferably 60 times or more.
The compressive strength of the foamed resin molding is measured according to JIS K 7220: 2006 (Rigid foamed plastic-How to determine compression characteristics). The compressive stress at 10% deformation is 10 kN/m ² or more, preferably 15 kN/m ² or more. , particularly preferably 20 kN/m ² or more. Higher compressive strength is preferable because the scaffold member can have strength. On the other hand, anything larger than 100 kN/m ² is not realistic.

[Coating layer 12]
The coating layer 12 is provided on all surfaces of the rectangular parallelepiped main body 11 .
The lower limit of the elongation rate (test method: equivalent to ASTM D412, JIS K 7113) of the coating layer 12 is 25% or more, 50% or more, 100% or more, 150% or more, preferably 200% or more, 250% or more. is 280% or more. The upper limit of the elongation rate is 500% or less, preferably 400% or less, 350% or less, and particularly preferably 320% or less. If it is less than 25%, the tackiness developed in the coating layer 12 becomes small, and the bonding strength becomes weak when a plurality of scaffolding members are stacked and combined by applying a predetermined force. Also, if the elongation is low, the coating layer 12 is likely to crack, and it becomes difficult to provide it thinly. If it is more than 500%, the adhesive coating layer 12 will easily peel off from the main body 11 when an external force is applied to separate the scaffolding members 10 after stacking a plurality of scaffolding members.
Examples of such coating layer 12 include synthetic resins such as acrylic resins, vinyl chloride resins, cellulose resins, polyester resins, and polyurethane resins. In particular, polyurethane, polyurea, or polyurethaneurea is preferred. These are preferred because of their high wear resistance and high curing speed. In particular, flexible polyurethane, flexible polyurea, and flexible polyurethane urea are preferred.
Moreover, it is preferable that the coating layer 12 is nonflammable based on JIS K 6911 (2006, applied mutatis mutandis to A method). By imparting noncombustibility to the coating layer 12, it is possible to prevent burning in the event of a fire, etc., so it is preferable as an indoor scaffold for repair work of important cultural properties that are installed for a long period of time.

Next, other physical properties of the coating layer 12 will be described.
The upper limit of the hardness of the coating layer 12 is 50 or less Shore D hardness, 90 or less Shore A hardness, preferably 80 or less Shore A hardness, and particularly preferably 75 or less Shore A hardness. On the other hand, the lower limit of the hardness is 40 or more Shore A hardness, 50 or more Shore A hardness, preferably 60 or more Shore A hardness, particularly preferably 65 or more Shore A hardness. If the hardness is too high, the coating layer 12 is likely to crack, making it difficult to thin it, and sufficient adhesiveness cannot be obtained. On the other hand, if the hardness is too low, it becomes difficult to obtain sufficient strength as a coating layer.
The lower limit of the tensile strength of the coating layer 12 (test method: equivalent to ASTM D412, JIS K 7113) is 1 MPa or more, preferably 5 MPa or more, particularly preferably 10 MPa or more, and the upper limit is 30 MPa or less, 20 MPa or less, especially It is preferably 15 MPa or less.
Additives may be added to the coating layer 12 as long as they do not affect the effects of the present invention. In particular, it is preferable to add an additive (nonflammable agent) so as to be nonflammable based on JIS K 6911 (2006, applicable to Method A).
The lower limit of the thickness of the coating layer 12 is 0.2 mm or more, preferably 0.3 mm or more, and particularly preferably 0.4 mm or more. On the other hand, the upper limit of the thickness is 3 mm or less, preferably 2 mm or less, 1.5 mm or less, and particularly preferably 1.0 mm or less. When the thickness of the coating layer 12 exceeds 3 mm, the weight of the scaffolding member is greatly affected. On the other hand, if the thickness of the coating layer 12 is less than 0.2 mm, the adhesive coating layer 12 will easily peel off from the main body 11 when an external force is applied to separate the scaffolding members 10 after the scaffolding members are assembled. .

"Scaffolding 1"
The scaffolding 1 shown in FIG. 1c is assembled by stacking the scaffolding members 10 shown in FIG. 1a five times in three layers.
A floor board 15 is provided on the upper surface of the scaffold 1, which serves as a working surface. As a result, it is possible to eliminate the inconvenience at the site such as the worker tripping due to the sticking of the scaffold member 10. - 特許庁Further, in order to support the connection of the scaffolding members 10, the scaffolding 1 may be wrapped around the entire scaffolding 1 with lashing belts 16 or the like, or the edges of the scaffolding 1 may be supported with corner supports 17. By supporting each scaffolding member 10 with another member in this way, a plurality of scaffolding members 10 can be joined more firmly.
In the scaffolding 1 shown in FIG. 1c, a plurality of scaffolding members 10 are piled up by rolling, but the stacking method is not particularly limited. The worker can appropriately decide according to the situation of the work place, such as block piling to be piled up, alternate row piling to ply the scaffolding members 1 arranged like blocks in different directions one by one, and brick piling.
Furthermore, FIG. 1d shows the scaffold 1 provided with a fence 20 . The fence 20 consists of four posts 21 and ropes 22 connecting them. A hole 18 for inserting a support 21 is formed in the upper surface of the scaffolding 1 (at least the floorboard 15 and the floorboard 15 and the topmost scaffolding member 10). By providing the fence on the scaffolding 1 in this way, the safety of the worker can be ensured. The form of the fence 20 is not particularly limited as long as it can prevent the worker from falling from the scaffolding 1, and a fence may be provided instead of the rope 22. Alternatively, a fence 20 may be provided on the top scaffolding member 10, and a floor board 15 may be provided in an empty area on the upper surface of the scaffolding member 10.例文帳に追加

Since the scaffold member 10 is made of a foamed resin molded body in this way, even if a plurality of scaffold members are stacked to form the scaffold 1, the total weight can be suppressed, and the floor of a wooden structure or the like is less likely to be damaged. In particular, it can be preferably used as a scaffold for repairing old wooden buildings. Further, the scaffolding members 10 can be connected or joined together so that the adjacent scaffolding members 10 are not displaced from each other by bringing the coating layers 12 that are adjacent vertically or horizontally into contact with each other. In particular, since the scaffolding member 10 is joined to the adjacent scaffolding member 10 by the six surfaces of the upper, lower, front, rear, left, and right surfaces, it is difficult to collapse even if a force is applied in one direction.

[Other forms]
The scaffold member 10 in FIG. 1 has a rectangular parallelepiped shape, but is not particularly limited as long as it has a three-dimensional structure with parallel upper and lower surfaces. For example, a three-dimensional structure having at least upper and lower surfaces, such as the triangular prism-shaped scaffolding member 10a in FIG. 2a, the octagonal prism-shaped scaffolding member 10b in FIG. 2b, and the cylindrical scaffolding member 10c in FIG. 2c, may be used. When the scaffolding member 10a in FIG. 2a and the scaffolding member 10b in FIG. 2c have a three-dimensional structure having planes (side surfaces) perpendicular to the upper and lower surfaces, the scaffolding members that are adjacent to each other on the left and right are not displaced from each other. It is preferable because it can be connected. The scaffolding 1a in FIG. 2d is obtained by stacking the scaffolding members 10a in FIG. 2a, the scaffolding 1b in FIG. 2e is obtained by stacking the scaffolding members 10b in FIG. 2b, and the scaffolding 1c in FIG. The member 10c is piled up. This stacking method is not particularly limited, and the scaffolding members may be arranged without gaps like the scaffolding 1a in FIG. There may be

Reference Signs List 1, 1a, 1b, 1c Scaffolding 10, 10a, 10b, 10c Scaffolding member 11 Main body 12 Coating layer 15 Floor board 16 Belt 17 Corner pad 18 Hole 20 Fence 21 Post 22 Rope

Claims (7)

A scaffold member for stacking two or more to form a scaffold for indoor work,
a foamed resin molding;
and a synthetic resin coating layer provided on the entire surface ,
The foamed resin molding is flame retardant,
The coating layer is nonflammable based on JIS K 6911 (2006, mutatis mutandis applied to A method),
Scaffolding material for indoor work. The scaffolding is for repairing or repairing shrines, temples, important cultural properties or wooden buildings,
A scaffold member according to claim 1. The thickness of the coating layer is 0.2 mm or more and 3 mm or less.
A scaffold member according to claim 1. The coating layer is made of a synthetic resin having an elongation of 25% or more,
The scaffolding member of claim 1. The foamed resin molding is made of expanded polystyrene,
The coating layer is made of polyurethane, polyurea or polyurethaneurea,
The scaffolding member of claim 1. A scaffold assembled by stacking a plurality of scaffolding members according to any one of claims 1 to 5,
Scaffolding with floorboards on the top. A scaffold assembled by stacking a plurality of scaffolding members according to any one of claims 1 to 5,
Scaffolding with a fence on the top.

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