Scaffolding boards

Abstract

To provide a metal scaffolding plank that improves transportability and construction efficiency through weight reduction without compromising strength against bending or twisting. [Solution] The scaffolding board 1 comprises a scaffolding board body 2 consisting of one or more scaffolding board materials 20 having a top plate portion 21 and two front and rear side frame portions 22. The two side frame portions 22 located at the front and rear edges of the scaffolding board body 2 are composed of a first side frame portion 22A which forms part of the length of the side frame portion 22 and has a cross-section such that it cooperates with the front and rear edges of the top plate portion 21 to form a closed internal space, and a second side frame portion 22B which forms the remaining part of the length of the side frame portion 22 and has a cross-section that opens inward in the front and rear direction.

Description

[Technical Field]

[0001] The present invention relates to a scaffold plank used as a member that constitutes a working floor of a temporary scaffold. [Background Art]

[0002] In temporary scaffolds, scaffold planks (ledgers with planks) that are bridged over two left and right ledgers of the temporary scaffold are generally used as members for constituting the working floor. Scaffold planks include wooden and metal types, but in recent years, metal scaffold planks excellent in durability, strength, and the like have become mainstream. As a metal scaffold plank, for example, as disclosed in Patent Document 1, a scaffold plank body that is formed by arranging a single scaffold plank member having a top plate portion elongated in the left-right direction and two side frame portions provided continuously to front and rear edge portions of the top plate portion, or arranging a plurality of the scaffold plank members in front-rear parallel and connecting them to each other, two end frame members attached to left and right end portions of the scaffold plank body, and There is known a scaffold plank including four hooking fittings attached two each at intervals in the front-rear direction on each of the left and right end portions of the scaffold plank body and hooked to the ledger. In the above-described scaffold plank, the two side frame portions of the scaffold plank member are constituted by a side wall portion extending downward from front and rear edges of the top plate portion, a lower wall portion extending inward in the front-rear direction from a lower edge of the side wall portion, and a rising wall portion extending upward from a tip edge of the lower wall portion. [Prior Art Document] [Patent Document]

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2013-249719 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] In the case of a metal scaffold plank, particularly a steel scaffold plank, while it is excellent in strength against bending, twisting, and the like, it has a large weight, so that there is a problem that it is inferior in transportability and construction efficiency during installation and removal.

[0005] The objective of this invention is to provide a metal scaffolding plank that can be made lighter, thereby improving transportability and construction efficiency, without compromising strength against bending or twisting. [Means for solving the problem]

[0006] This invention, in order to solve the above-mentioned problems, comprises the following embodiments.

[0007] 1) A scaffolding board comprising a scaffolding board body which is made up of a single metal scaffolding board material having a top plate portion that is long in the left-right direction and two side frame portions that are attached in a hanging manner to the front and rear edges of the top plate portion, or a plurality of such scaffolding boards arranged in parallel in the front and rear and connected to one another, A scaffolding board characterized in that two side frame portions of a single scaffolding board material constituting the scaffolding board body, or at least two side frame portions located at the front and rear edges of each of the two side frame portions of a plurality of scaffolding board materials constituting the scaffolding board body, are composed of a first side frame portion having a cross-section that forms part of the length of each side frame portion and cooperates with the front and rear edges of the top plate portion to form a closed internal space, and a second side frame portion having a cross-section that forms the remaining part of the length of each side frame portion and opens inward in the front and rear direction.

[0008] 2) The scaffolding board as described in 1), wherein in two side frame sections of a single scaffolding board material constituting the scaffolding board body, or in at least two side frame sections located at the front and rear edges of a plurality of scaffolding board materials constituting the scaffolding board body, the first side frame section is provided in the central part in the longitudinal direction of each side frame section, and the second side frame section is provided in the left and right parts in the longitudinal direction of each side frame section.

[0009] 3) The second side frame portion is composed of a side wall portion extending downward from the front and rear edges of the top plate portion of the scaffolding board material, a bottom wall portion extending inward in the front-rear direction from the lower edge of the side wall portion, and a rising wall portion extending upward from the leading edge of the bottom wall portion. The scaffolding board according to 1) or 2) above, wherein the first side frame portion is composed of a side wall portion, a bottom wall portion, and a rising wall portion of the scaffolding board material, and a closing board material whose lower edge is joined to the rising wall portion and whose upper edge is joined to the top board portion.

[0010] 4) One or multiple vertical crossbars extending in the left-right direction are provided at intervals in the front-to-back direction on the middle of the width of the underside of the scaffolding board. The vertical support members are scaffolding boards from any one of the above 1) to 3), having a cross-section such that they cooperate with the middle section of the top board to form a closed internal space. [Effects of the Invention]

[0011] In the scaffolding board described in 1) above, a portion of the length of the two side frame sections of the scaffolding board material located at the front and rear edges of the scaffolding board body consists of a first side frame section that forms a closed cross-section. Therefore, even if the thickness of the metal plate used as the material for the scaffolding board is reduced, the required rigidity can be obtained and deflection can be reduced. Furthermore, in the scaffolding board described in 1) above, the remaining portion of the length of the side frame section consists of a second side frame section that has a cross-section that opens inward in the front-rear direction, thus reducing the weight. Therefore, the scaffolding board described in 1) above can be used to improve transportability and construction efficiency through weight reduction, without reducing strength against bending or twisting, compared to the conventional scaffolding board disclosed in Patent Document 1.

[0012] In the case of the scaffolding board described in 2) above, the first side frame portion is provided in the central part in the longitudinal direction of each side frame portion, and the second side frame portion is provided in the left and right parts in the longitudinal direction of each side frame portion, so the effect of the scaffolding board described in 1) above is even more pronounced.

[0013] In the case of the scaffolding board described in 3) above, the second side frame portion is composed of a side wall portion, a bottom wall portion, and a rising wall portion that form part of the scaffolding board material, and the first side frame portion is composed of the side wall portion, the bottom wall portion, and the rising wall portion, and a closing plate material that is joined to a predetermined location on the scaffolding board material. Therefore, a scaffolding board having the configuration and effects of 1) or 2) above can be manufactured easily and at low cost.

[0014] In the case of the scaffolding board described in 4) above, the strength against deflection, twisting and the like is reinforced by the vertical crosspieces, so sufficient strength can be obtained even when, for example, increasing the width of the scaffolding board material. [BRIEF DESCRIPTION OF THE DRAWINGS]

[0015] [Figure 1] This figure shows a state where the scaffolding board according to the embodiment of the present invention is erected on a temporary scaffolding, where (a) is a plan view and (b) is a front view. [Figure 2] (a) is a plan view of the above scaffolding board, and (b) is a front view of the above scaffolding board. [Figure 3] (a) is a side view of the above scaffolding board, and (b) is an enlarged cross-sectional view taken along line C-C of (a). [Figure 4] (a) is a cross-sectional view taken along line A-A of FIG. 2(b), and (b) is a cross-sectional view taken along line B-B of FIG. 2(b). [MODE FOR CARRYING OUT THE INVENTION]

[0016] A scaffolding board according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 4. In the following description, the lower side of each of FIG. 1(a) and FIG. 2(a) is referred to as "front", and the upper side thereof is referred to as "rear"; and left and right refer to left and right when viewed from the front (for example, the left and right of each of FIG. 1(b) and FIG. 2(b)).

[0017] As shown in FIG. 1, in a temporary scaffolding, a plurality of pairs of front and rear paired struts (C1) are erected at predetermined intervals in the left-right direction, and a ledge member (C2) is horizontally stretched and fixed to each pair of struts (C1). Then, the scaffolding boards (1) (ledge frames with floor) of the present invention are respectively erected on two parallel ledge members (C2) adjacent to each other in the left-right direction to form a working floor.

[0018] Figures 2 to 4 show a scaffold board (1) according to an embodiment of the present invention. The illustrated scaffold board (1) comprises: a scaffold board main body (2) elongated in the left-right direction; two end frame members (3) elongated in the front-rear direction attached to the left and right end portions of the scaffold board main body (2); and four latch fittings (4), two of which are attached at intervals in the front-rear direction to each of the left and right end portions of the scaffold board main body (2) and are latched to a ledger member (C2). Note that illustration of the latch fittings (4) and the like is omitted in Figure 3(b). The scaffold board (1) further comprises a reinforcing member (5) extending in the front-rear direction and attached to an intermediate position in the length direction of the lower surface of the scaffold board main body (2). Furthermore, the scaffold board (1) comprises a longitudinal crosspiece member (6) extending in the left-right direction and attached to an intermediate position in the width direction of the lower surface of the scaffold plate member (20).

[0019] The scaffold board main body (2) is constituted by a single scaffold plate member (20). However, the scaffold board main body may be constituted by two or more scaffold plate members arranged in parallel in the front-rear direction and connected to each other. The scaffold plate member (20) comprises a top plate portion (21) elongated in the left-right direction, and two side frame portions (22) connected to the front and rear edges of the top plate portion (21) and provided in a downwardly hanging shape. This scaffold plate member (20) is formed, for example, by forming a metal plate such as a steel plate (more specifically, by roll forming processing or the like). A preferable material for the scaffold plate member (20) is a high-tensile steel plate having a tensile strength of 500 MPa or more. When a high-tensile steel plate is used as the material of the scaffold plate member (20), the plate thickness is preferably 1 mm or less, and more preferably 0.8 mm or less. If a high-tensile steel plate having the above plate thickness is used, significant weight reduction of the scaffold plate member (20) can be achieved.

[0020] The top plate portion (21) of the scaffold plate member (20) constitutes the tread surface of the scaffold board (1), and is formed in a strip shape having a predetermined length and width. The length and width of the top plate portion (21) are appropriately set according to the size of the temporary scaffold to be installed. The top plate (21) has an upper groove-shaped section (212) formed in the middle of its width (the middle of the front-to-back width in the figure), which extends along its entire length and has a concave upper surface. This upper groove-shaped section (212) increases the strength of the top plate (21) against bending and twisting. The cross-sectional shape of the upper groove-shaped section (212) is, for example, a roughly V shape as shown in the figure. Note that the number of upper groove-shaped sections is not limited to one, but may be two or more. Furthermore, the top plate portion (21) has numerous upper holes (211) formed in the flat portion excluding the upper groove-shaped portion (212). The upper holes (211) are formed by embossing the top plate portion (21) with an upward convex shape (approximately frustoconical shape), and punching out the top wall portion of the upward convex shape formed by this embossing. These upper holes (211) serve to reduce the weight of the scaffolding board material (20) and can also function as drainage holes for the top plate portion (21). In addition, the upward convex hole edges (211a) around the upper holes (211) can function as anti-slip surfaces. Note that the shape, arrangement, number, etc. of the upper holes are not limited to the above embodiment and can be changed as appropriate.

[0021] The two front and rear side frame sections (22) of the scaffolding board material (20) each have a side wall section (221) extending downward from the front and rear edges of the top board section (21), a bottom wall section (222) extending inward in the front-rear direction from the lower edge of the side wall section (221), and a rising wall section (223) extending upward from the leading edge of the bottom wall section (222). The height of the side frame section (22) (the vertical width of the side wall section (221)) is usually 40 to 50 mm. The rising wall portion (223) may be oriented vertically upward as shown in the figure, or it may be oriented diagonally upward in the front-rear direction outward or inward. The vertical width of the rising wall portion (223) is not particularly limited, but for example it can be about one-quarter to one-third of the vertical width of the side wall portion (221). The upper edge of the rising wall portion (223) consists of a bent upper edge portion (223a) that is bent in a roughly arc shape outward in the front-rear direction. When a worker carries the scaffolding board (1) by gripping the front and rear edges with their hands, their fingers may come into contact with the upper edge of the rising wall portion (223) of the scaffolding board material (20). However, if this portion is made of a bent upper edge portion (223a) as described above, it will not hurt the fingers, making it easier to hold and eliminating the risk of injuring the fingers. The cross-sectional shape of the bent upper edge portion (223a) may be a semi-circular arc as shown in the figure, or it may be a quarter-circular arc, a C-shape, or the like.

[0022] In this embodiment of the scaffolding board (1), the two side frame portions (22) located at the front and rear edges of the scaffolding board body (2), that is, the two front and rear side frame portions (22) of a single scaffolding board material (200) constituting the scaffolding board body (2), consist of a first side frame portion (22A) which forms part of the length of each side frame portion (22) and has a cross-section such that it cooperates with the front and rear edges of the top plate portion (21) to form a closed internal space, and a second side frame portion (22B) which forms the remaining part of the length of each side frame portion (22) and has a cross-section that opens inward in the front and rear direction. Therefore, the rigidity of the scaffolding board (1) is increased by the presence of the first side frame portion (22A), while the increase in weight is suppressed by the presence of the second side frame portion (22B). In the two side frame sections (22) of the scaffolding board material (20), the first side frame section (22A) is provided in the central part of the length direction of each side frame section (22). The second side frame sections (22B) are provided on the left and right sides of the length direction of each side frame section (22). In the illustrated scaffolding board (1), the length of the first side frame section (22A) and the two second side frame sections (22B) is approximately one-third of the total length of the side frame section (22). However, the arrangement and length of the first side frame section (22A) and the second side frame sections (22B) are not limited to the above configuration and can be changed as appropriate. More specifically, as shown in Figure 4, the first side frame portion (22A) is composed of a side wall portion (221), a bottom wall portion (222), and a rising wall portion (223) of the scaffolding board material (20), and a closing board material (23) whose lower edge is joined to the rising wall portion (223) and whose upper edge is joined to the top board portion (21). The second side frame portion (22B) is composed of a side wall portion (221), a bottom wall portion (222), and a rising wall portion (223) of the scaffolding board material (20). According to this embodiment, a scaffolding board (1) having the above configuration can be manufactured easily and at low cost. The closing plate material (23) is a vertical plate that is long in the left-right direction and is made of a metal plate such as a steel plate. The metal plate that makes up the closing plate material (23) can be the same as the metal plate that makes up the scaffolding plate material (20), but a different material or thickness may be used from the latter metal plate. The lower edge of the closing plate material (23) is joined to the inner surface in the front-rear direction of the rising wall portion (223) by joining means such as welding or rivets. The upper edge of the closing plate material (23) consists of a folded upper edge portion (231) that is bent horizontally inward or outward in the front-rear direction. This folded upper edge portion (231) is joined to the lower surface of the top plate portion (21) by joining means such as welding or rivets.

[0023] The left and right end frame members (3) are attached to the left and right ends (short sides) of the scaffolding board body (2) and constitute the end frame portion of the scaffolding board body (2). In the case of the scaffolding board (1) of this embodiment, the end frame member (3) is attached to almost the entire length of each left and right end (short side) of a single scaffolding board material (20) that constitutes the scaffolding board body (2). If the scaffolding board body is composed of multiple scaffolding board materials, the end frame member is attached across each left and right end (short side) of the multiple scaffolding board materials. Therefore, in the above case, the end frame member also serves the function of connecting multiple scaffolding board materials. The end frame member (3) has an upper plate portion (31) which is positioned and fixed to the upper surface of each left and right end of the scaffolding board body (2), a side plate portion (32) which extends downward from the left and right outer edge of the upper plate portion (31), and a lower plate portion (33) which extends inward in the left and right direction from the lower edge of the side plate portion (32). The upper plate portion (31) is roughly in the shape of a strip extending in the front-to-back direction, with one side in the width direction overlapping the end of the upper surface of the scaffolding board body (2), that is, the left and right ends (short sides) of the upper plate portion (21) of a single scaffolding board material (20), and fixedly attached to these ends by joining means such as welding or rivets. The other side of the upper plate portion (31) in the width direction is designed to protrude outward in the left-right direction from the end of the scaffolding board body (2). The side plate portion (32) has an upper part that extends diagonally downward inward from the leading edge of the upper plate portion (31) in the left-right direction, while the remaining portion extends vertically downward so as to be roughly parallel to the end face of the scaffolding board material (20). The lower plate portion (33) extends horizontally inward from the lower edge of the side plate portion (32) in the left-right direction.

[0024] The side plate portions (32) (more specifically, the lower vertical portions of the side plate portions (32)) of the left and right end frame members (3) are each formed with openings (321) that can be used to attach hooks (not shown) for suspending scaffolding boards and to allow fingers to be inserted when gripping the scaffolding board (1). In other words, the openings (321) function as hook attachment points when suspending and transporting the scaffolding board (1) using a crane or the like, and also function as finger insertion points when workers grasp the left and right ends of the scaffolding board (1) by hand and transport it. In this embodiment, one opening (321) is formed in the center of the side plate portion (32). The opening (321) is also made up of a hole formed in the center of the side plate portion (32). More specifically, the opening (321) is formed by a rectangular hole that is elongated in the front-to-back direction, as shown in Figure 3. The upper edge of the opening (321) consists of a bent upper edge (321a) with a U-shaped cross-section, which is bent inward in the left-right direction and upward at the tip. The lower edge of the opening (321) consists of a bent lower edge (321b) with an inverted U-shaped cross-section, which is bent inward in the left-right direction and downward at the tip. Furthermore, the number of openings formed in each end frame member is not limited to one; there may be two or more. Also, the shape, structure, and arrangement of the openings are not limited to the configuration shown in the illustration; other shapes, structures, and arrangements are acceptable as long as they perform the functions described above.

[0025] Furthermore, in the scaffolding board (1) of this embodiment, the portion of the leading edge of the lower plate portion (33) of each end frame member (3) located below the opening (321) consists of a bent leading edge portion (331) that is bent upward in a substantially arc shape. The cross-sectional shape of the bent leading edge portion (331) may be a semi-circular arc as shown in the figure, or it may be a quarter-circular arc or a substantially C-shape. When a worker carries a scaffolding board (1) by grasping its left and right ends with their hands, their fingers may get caught on the bent lower edge (321b) of the opening (321) of the side plate portion (32) of the end frame member (3) and on the leading edge of the bottom plate portion (33). However, if the leading edge of the bottom plate portion (33), which is located below the opening (321), is made up of a bent leading edge (331), as in the above configuration, the fingers caught on this portion (331) will not become painful, making it easier to hold and eliminating the risk of injuring the fingers. As shown in Figure 3(a), the folded tip edge (331) of this embodiment has a length in the front-to-back direction such that both the front and rear sides of it protrude outward in the front-to-back direction beyond the opening (321). This ensures that the aforementioned effects are achieved more reliably. The folded tip edge (331) may also be formed over almost the entire length of the tip edge of the lower plate portion (33).

[0026] The fastening fitting (4) is for fastening the scaffolding board (1) to the fabric material (C2), and comprises a fastening fitting body (40) which integrally has a mounting base (41) that is attached to the scaffolding board body (2) (in this embodiment, the left and right ends of the two front and rear side frame parts (22) of a single scaffolding board material (20) by rivets or the like, and a substantially C-shaped hook part (42) that is fastened to the fabric material (C2), and a locking member (43) which is attached to the base end of the hook part (42) so as to be vertically movable and prevents the hook part (42) from coming off the fabric material (C2) unintentionally.

[0027] The reinforcing members (5) are installed laterally (in the front-to-back width direction) on the underside of the long scaffolding board body (2) and function as horizontal braces to reinforce the strength against bending, twisting, etc. In the scaffolding board (1) shown in the figure, three reinforcing members (5) are provided at predetermined intervals in the middle of the length on the underside of a single scaffolding board material (20) that makes up the scaffolding board body (2). However, the number of reinforcing members to be installed is not limited to three, and may be one, two, or four or more. More specifically, the reinforcing member (5) comprises a base portion (51) which is long in the front-rear direction and is joined to the lower surfaces of both lower wall portions (222) so as to connect the lower wall portions (222) of the two front and rear side frame portions (22) of the scaffolding board material (20), and one or more (in this case, three) rising portions (52) which extend upward from the base portion (51) and whose upper ends are in contact with the lower surface of the top plate portion (21) of the scaffolding board material (20). The reinforcing member (5) is formed, for example, by punching out a metal plate such as a steel plate into a predetermined shape and then performing a predetermined bending process. The base portion (51) is in the shape of a strip plate, and its front and rear ends are joined to the lower surface of the lower wall portion (222) of the front and rear side frame portion of the scaffolding board material (20) by joining means such as welding. The rising portion (52) extends upward from one side edge of the midpoint of the base portion (51). The rising portion (52) shown in the figure is a vertical plate-like structure with an isosceles trapezoidal shape when viewed from the left or right direction. In addition, multiple (two in this case, front and back) weight-reducing holes (521) are formed in the rising portion (52). The upper edge of the rising portion (52) is bent horizontally so as to protrude on the opposite side from the base portion (51), and this portion constitutes the upper overhanging edge portion (53). The upper overhanging edge portion (53) is joined to the underside of the top plate portion (21) of the scaffolding board material (20) by joining means such as welding.

[0028] The vertical braces (6) are installed vertically (in the left-right length direction) on the underside of the long scaffolding board body (2) and function as vertical braces to reinforce the strength against bending, twisting, etc. The vertical braces (6) have a cross-section such that they work together with the middle of the width of the top board (21) to form a closed internal space. In the scaffolding board (1) shown in the figure, two vertical braces (6) are provided at predetermined intervals in the middle of the width on the underside of a single scaffolding board material (20) that makes up the scaffolding board body (2). However, the number of vertical braces to be installed is not limited to two, and may be one or three or more. More specifically, the vertical brace member (6) has a roughly U-shaped cross-section, comprising a horizontal strip-shaped lower wall portion (61) extending in the left-right direction, and two side wall portions (62) extending upward from the front and rear edges of the lower wall portion (61). The upper edges of the side wall portions (62) of the vertical brace member (6) consist of bent upper edges (621) that are bent horizontally outward. These bent upper edges (621) are joined to the lower surface of the top plate portion (21) of the scaffolding board (20) by joining means such as welding. Furthermore, the lower wall portion (61) of the vertical brace member (6) is joined to the upper surface of the intermediate length portion of the base portion (51) of the reinforcing member (5) (more specifically, the portion between the rising portions (52) of the base portion (51) by joining means such as welding. The vertical support members (6) and the middle section of the top plate (21) form a closed internal space with a rectangular cross-section. The vertical support members (6) may be provided along the entire length of the scaffolding board (20) as shown in the figure, or they may be provided only along a portion of the length of the scaffolding board (20) (for example, the middle section). The vertical bracing members (6) are formed, for example, by bending a metal plate such as a steel plate that has been cut to a predetermined width.

[0029] According to the scaffolding board (1) of this embodiment, the central part in the longitudinal direction of the two side frame portions (22) of the scaffolding board material (20) located at the front and rear edges of the scaffolding board body (2) consists of a first side frame portion (22A) that forms a closed cross-section. Therefore, even if the thickness of the metal plate used as the material for the scaffolding board material (20) is reduced, the required rigidity can be obtained and deflection can be reduced. Furthermore, according to the scaffolding board (1) of this embodiment, the left and right portions of the side frame portion (22) consist of a second side frame portion (22B) having a cross-section that opens inward in the front-rear direction, thus suppressing an increase in weight. Furthermore, according to the scaffolding board (1) of this embodiment, by providing the side frame portion (22) with a portion having a closing plate material (23) and a portion not having one, the scaffolding board (1) having the first side frame portion (22A) and the second side frame portion (22B) described above can be manufactured easily and at low cost. [Industrial applicability]

[0030] This invention is suitably used as a metal scaffolding board (floor-mounted fabric frame) that is erected on the fabric material of a temporary scaffolding work platform to constitute the work platform. [Explanation of Symbols]

[0031] (1): Scaffolding board (2): Scaffolding board body (20): Scaffolding planks (21): Top plate (22): Side frame part (22A):First side frame part (22B):Second side frame part (221): Side wall section (222):Lower wall part (223): Rising wall section (23):Occluded plate material (3): End frame member (4): Hooking fastener (5): Reinforcement member (6): Vertical support members

Claims

1. A scaffolding board comprising a scaffolding board body which consists of a single scaffolding board material having a top plate portion that is long in the left-right direction and two side frame portions that are attached in a hanging manner to the front and rear edges of the top plate portion, or a plurality of scaffolding boards arranged in parallel in the front and rear and connected to each other, In a scaffolding board body, two side frame portions of a single scaffolding board material, or two side frame portions of each of a plurality of scaffolding board materials constituting the scaffolding board body, at least two side frame portions located at the front and rear edges of the scaffolding board body are composed of a first side frame portion having a cross-section that forms part of the length of each side frame portion and cooperates with the front and rear edges of the top plate portion to form a closed internal space, and a second side frame portion having a cross-section that forms the remaining part of the length of each side frame portion and opens inward in the front and rear direction. The second side frame section is composed of a side wall section extending downward from the front and rear edges of the top plate section of the scaffolding board, a lower wall section extending inward in the front-rear direction from the lower edge of the side wall section, and a rising wall section extending upward from the leading edge of the lower wall section. A scaffolding board characterized in that the first side frame portion is composed of a side wall portion, a bottom wall portion and a rising wall portion of a scaffolding board material, and a closing board material whose lower edge is joined to the rising wall portion and whose upper edge is joined to the top board portion.

2. The scaffolding board according to claim 1, wherein in two side frame portions of a single scaffolding board material constituting the scaffolding board body, or in at least two side frame portions located at the front and rear edges of a plurality of scaffolding board materials constituting the scaffolding board body, the first side frame portion is provided in the central portion in the longitudinal direction of each side frame portion, and the second side frame portions are provided in the left and right portions in the longitudinal direction of each side frame portion.

3. One or multiple vertical crossbars extending in the left-right direction are provided at the midpoint of the width of the underside of the scaffolding plank, spaced apart in the front-back direction. The scaffolding board according to claim 1 or 2, wherein the vertical support members have a cross-section such that they cooperate with the middle section of the width of the top board to form a closed internal space.

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