Scaffolding boards

Abstract

By adding a simple structure, this invention provides scaffolding planks that can reliably prevent shifting when stacked vertically. [Solution] The scaffolding board 1 comprises a scaffolding board body 2 and two end frame members 3 attached to both the left and right ends of the scaffolding board body 2. The upper plate portion 31 of the end frame member 3 has a first upper positioning portion 35a consisting of an upwardly protruding portion and a second upper positioning portion 35b consisting of an upwardly opening recess or hole. The lower plate portion 33 of the end frame member 3 has a first lower positioning portion 36a consisting of a downwardly opening recess or hole and a second lower positioning portion 36b consisting of a downwardly protruding portion. When two scaffolding boards 1 are stacked with their back surfaces facing downward, the first upper positioning portion 35a of the lower scaffolding board 1 and the first lower positioning portion 36a of the upper scaffolding board 1 are fitted together, and the second upper positioning portion 35b of the lower scaffolding board 1 and the second lower positioning portion 36b of the upper scaffolding board 1 are fitted together, thereby restricting the relative movement of both scaffolding boards 1 in the length and width directions.

Description

Technical Field

[0001] This invention relates to a scaffolding board used as a member constituting the working floor of a temporary scaffold.

Background Art

[0002] In a temporary scaffold, as a member constituting the working floor, a scaffolding board (fabric frame with a floor) installed on two fabric materials on the left and right of the temporary scaffold is generally used. The scaffolding boards are made of wood or metal. In recent years, metal scaffolding boards, which are excellent in durability, strength, etc., are the mainstream. Here, as a metal scaffolding board, for example, as shown in Patent Document 1 etc., a scaffolding board material having a long top plate portion in the left - right direction, two side wall portions extending downward from the front and rear edges of the top plate portion, and two bottom wall portions extending inward in the front - rear direction from the lower edges of both side wall portions is arranged alone, or a plurality of them are arranged in parallel in the front - rear direction and connected to each other to form a scaffolding board body, two end frame members attached to both left and right end portions of the scaffolding board body, and four latching fittings attached to both left and right end portions of the scaffolding board body at intervals in the front - rear direction and hooked on the fabric material are known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since a large number of scaffolding boards are used in a temporary scaffold, usually, they are transported and stored in a state where a plurality of them are stacked vertically. Therefore, if the scaffolding boards shift horizontally when stacked vertically, there is a risk of hindering transportation and storage.

[0005] The objective of this invention is to provide scaffolding boards that can reliably prevent shifting when stacked vertically by adding a simple structure. [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 body consisting of a single scaffolding board having a top plate that is long in the left-right direction, two side walls extending downward from both the front and rear edges of the top plate, and two bottom walls extending inward in the front-rear direction from the lower edges of the side walls, arranged in parallel in the front-rear direction and connected to one another, It is equipped with two end frame members that are long in the front-to-back direction and attached to both the left and right ends of the scaffolding board body, The end frame member has an upper plate portion that is positioned and fixed to the upper surfaces of both the left and right ends of the scaffolding board body, a side plate portion that extends downward from the left and right outer edges of the upper plate portion, and a lower plate portion that extends inward in the left and right directions from the lower edges of the side plate portion. The upper plate portions of the two end frame members have a first upper positioning portion consisting of an upwardly protruding portion formed near one of the two sets of diagonal portions of a virtual rectangle with the upper plate portion as the two sides, and at a point-symmetric position with respect to the center of the scaffolding board body, and a second upper positioning portion consisting of an upwardly opening recess or hole formed near the other set of diagonal portions of the scaffolding board body, and at a point-symmetric position with respect to the center of the scaffolding board body. The lower plate portions of the two end frame members have a first lower positioning portion, which is formed at a location corresponding to the first upper positioning portion and consists of a downward opening recess or hole that can be fitted into an upward opening recess or hole constituting the first upper positioning portion, and a second lower positioning portion, which is formed at a location corresponding to the second upper positioning portion and consists of a downward opening recess or hole that can be fitted into an upward opening recess or hole constituting the second upper positioning portion. A scaffolding board characterized in that, when two scaffolding boards are stacked with their undersides facing downwards, the first upper positioning portion of the lower scaffolding board and the first lower positioning portion of the upper scaffolding board are fitted together, and the second upper positioning portion of the lower scaffolding board and the second lower positioning portion of the upper scaffolding board are fitted together, thereby restricting the relative movement of both scaffolding boards in the length and width directions.

[0008] 2) The upward projection constituting the first upper positioning portion and the downward projection constituting the second lower positioning portion, and the upward opening recess or hole constituting the second upper positioning portion and the downward opening recess or hole constituting the first lower positioning portion are, respectively, the same shape and size except for the vertical orientation. The scaffolding board described in 1) above, wherein when two scaffolding boards are stacked with their backs facing each other, the first lower positioning portion of the lower scaffolding board and the second lower positioning portion of the upper scaffolding board are fitted together, and the second lower positioning portion of the lower scaffolding board and the first lower positioning portion of the upper scaffolding board are fitted together, thereby restricting the relative movement of both scaffolding boards in the length and width directions.

[0009] 3) The scaffolding board according to 1) or 2) above, wherein the upper plate portion of the end frame member has two protruding portions that extend inward in the left-right direction from near both the front and rear ends, and a first upper positioning portion and a second upper positioning portion are formed on both protruding portions.

[0010] 4) A scaffolding board according to any one of 1) to 3) above, wherein the lower plate portion of the end frame member has two protruding portions that extend inward in the left-right direction from near both the front and rear ends, and a first lower positioning portion and a second lower positioning portion are formed on both protruding portions.

[0011] 5) A scaffolding board body comprising a single scaffolding board having a top plate portion that is long in the left-right direction and has a plurality of weight-reducing holes formed on the edge of the hole portion which is convex upward, two side wall portions that extend downward from both the front and rear edges of the top plate portion, and two lower wall portions that extend inward in the front-rear direction from the lower edges of the side wall portions, or two of the scaffolding boards having been arranged in parallel in the front-rear direction and connected to each other, The scaffolding board body is equipped with reinforcing members, one or more of which are attached to the underside of the middle section of the board at intervals along its length. The reinforcing member has a long, plate-like shape in the front-to-back direction and a base portion that is joined to the lower surface of the lower wall portion so as to connect all of the lower wall portions of the scaffolding board body. At least one of the reinforcing members has a positioning portion consisting of a downward-opening recess or hole located at a position corresponding to the upward-convex edge of the weight-reducing hole, A scaffolding board characterized in that, when two scaffolding boards are stacked with their undersides facing downwards, the upper convex edge of the weight-reducing hole of the lower scaffolding board is accommodated in the positioning part of the upper scaffolding board, thereby restricting at least the relative movement in the length direction of the two scaffolding boards, of which the relative movement in the length direction and the width direction is restricted.

[0012] 6) The scaffolding board of 5) above, wherein the positioning portion consists of a downwardly opening recessed portion that is elongated in the front-to-back direction and formed in the base portion of the reinforcing member.

[0013] 7) A scaffolding board body comprising a single scaffolding board having a top plate that is long in the left-right direction, two side walls extending downward from both the front and rear edges of the top plate, and two bottom walls extending inward in the front-rear direction from the lower edges of the side walls, or multiple scaffolding boards arranged in parallel in the front-rear direction and connected to one another, It is equipped with two end frame members that are long in the front-to-back direction and attached to both the left and right ends of the scaffolding board body, The end frame member has an upper plate portion that is positioned and fixed to the upper surface of both the left and right ends of the scaffolding board body. The upper plate portion of the end frame member is provided with a positioning portion consisting of an upwardly protruding portion. The positioning section is configured such that, when two scaffolding boards are stacked with their undersides facing downwards, the positioning section of the lower scaffolding board engages with the leading edges of the two lower wall portions of the scaffolding board material of the upper scaffolding board, thereby restricting the relative movement of both scaffolding boards in the width direction.

[0014] 8) The end frame member further comprises a side plate portion extending downward from the left-right outer edge of the upper plate portion, and a lower plate portion extending inward in the left-right direction from the lower edge of the side plate portion. The scaffolding board according to 7) above, wherein the positioning part is configured such that when two scaffolding boards are stacked with their undersides facing downwards, the positioning part of the lower scaffolding board engages with the leading edge of the lower part of the upper scaffolding board, thereby restricting the relative movement of both scaffolding boards in the longitudinal direction.

[0015] 9) The upper plate portion has a protruding portion along its entire length that is located inward in the left-right direction from the leading edge of the lower plate portion when viewed from a plane, The scaffolding board according to 8) above, wherein the positioning portion consists of an upwardly protruding ridge that is long in the front-to-back direction and formed on the protruding portion of the upper board.

[0016] 10) A scaffolding board body comprising a single scaffolding board having a top plate that is long in the left-right direction, two side walls extending downward from both front and rear edges of the top plate, and two bottom walls extending inward in the front-rear direction from the lower edges of the side walls, or two of the scaffolding boards arranged in parallel front to back and connected to each other, The scaffolding board body is equipped with multiple reinforcing members attached at intervals along its length to the underside of the middle section, Each reinforcing member has a long, plate-like shape in the front-to-back direction and a base portion that is joined to the lower surface of the lower wall portion so as to connect all of the lower wall portions of the scaffolding board body. The multiple reinforcing members include a pair of left and right reinforcing members located equidistant from the longitudinal center of the scaffolding board body. The base portion of a pair of left and right reinforcing members has a first positioning portion consisting of a downward protrusion formed near one of the two sets of diagonal portions of a virtual rectangle with the base portion as two sides, and at a point-symmetric position with respect to the center of the scaffolding board body, and a second positioning portion consisting of a downward opening recess or hole formed near the other set of diagonal portions of the scaffolding board body, and at a point-symmetric position with respect to the center of the scaffolding board body. When two scaffolding boards are stacked with their back sides facing each other, the first positioning portion of the lower scaffolding board and the second positioning portion of the upper scaffolding board are fitted together, and the second positioning portion of the lower scaffolding board and the first positioning portion of the upper scaffolding board are also fitted together, so that relative movement in the length direction and width direction of both scaffolding boards is restricted. The scaffolding board is characterized by this.

Effect of the Invention

[0017] In the scaffolding board of the invention of 1) to 4) above, by the first and second upper positioning portions provided on the upper plate portion of the both-end frame members and the first and second lower positioning portions provided on the lower plate portion of the both-end frame members, relative movement in the length direction and width direction of both scaffolding boards when stacking both scaffolding boards with their back sides facing downward is restricted. Moreover, in the above scaffolding board, even when the lengthwise directions of the stacked scaffolding boards are reversed left and right, the above action can be obtained. Also, in the case of the scaffolding board of the invention of 2) above, in addition to the above action, relative movement in the length direction and width direction of both scaffolding boards when stacking both scaffolding boards with their back sides facing each other is restricted. In the scaffolding board of the invention of 5) to 6) above, by the positioning portion provided on the base portion of the reinforcing member, at least relative movement in the length direction of relative movement in the length direction and width direction of both scaffolding boards when stacking both scaffolding boards with their back sides facing downward is restricted. In the scaffolding board of the invention of 7) to 9) above, by the positioning portion provided on the upper plate portion of the two end frame members, relative movement in the width direction (and relative movement in the length direction) of both scaffolding boards when stacking both scaffolding boards with their back sides facing downward is restricted. Also, in the scaffolding board of the invention of 10) above, by the first and second positioning portions provided on the base portions of the pair of left and right reinforcing members, relative movement in the length direction and width direction of both scaffolding boards when stacking both scaffolding boards with their back sides facing each other is restricted. The above-described structure and its action are not disclosed or suggested in prior documents including Patent Document 1. As described above, the scaffolding planks of this invention can reliably prevent shifting when stacked vertically by adding a simple structure to conventional scaffolding planks. [Brief explanation of the drawing]

[0018] [Figure 1] This figure shows a scaffolding board according to the first embodiment of this invention installed 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 scaffolding board, (b) is a front view of the scaffolding board, and (c) is a bottom view of the scaffolding board. [Figure 3] (a) is a side view of the scaffolding board, and (b) is an enlarged side view of the scaffolding board with the middle section omitted. [Figure 4] This is an enlarged plan view of the scaffolding plank with the intermediate section omitted. [Figure 5] (a) is a magnified front view of the left end of the scaffolding board, and (b) is a magnified front view of the right end of the scaffolding board. [Figure 6] This is an enlarged bottom view of the scaffolding plank, with the intermediate section omitted. [Figure 7] This is an enlarged bottom view of the central part of the scaffolding plank. [Figure 8] (a) is a vertical cross-sectional view along the line VIII-VIII in Figure 2(c), and (b) is an enlarged view of the right half of (a). [Figure 9] This is a partially enlarged vertical cross-sectional view along the line IX-IX in Figure 8. [Figure 10] (a) is a side view of the scaffolding board material used in the scaffolding board, and (b) is an enlarged view of section bb of (a). [Figure 11] This shows a modified example of scaffolding planks, where (a) is a side view of the scaffolding plank and (b) is an enlarged view of section bb of (a). [Figure 12] This is a front view showing multiple identical scaffolding planks stacked on top of each other. [Figure 13] This is an enlarged front view with intermediate steps omitted, showing multiple identical scaffolding planks stacked on top of each other. [Figure 14] This is an enlarged side view with intermediate steps omitted, showing multiple identical scaffolding planks stacked on top of each other. [Figure 15] This is a vertical cross-sectional view showing multiple scaffolding boards stacked on top of each other, and is a vertical cross-sectional view at the cutting position corresponding to Figure 9. [Figure 16] This shows a scaffolding board according to a second embodiment of the present invention, where (a) is a plan view, (b) is a front view, and (c) is a bottom view. [Figure 17] (a) is a side view of the scaffolding board, and (b) is an enlarged side view of the scaffolding board with the middle section omitted. [Figure 18] This is an enlarged plan view of the scaffolding plank with the intermediate section omitted. [Figure 19] (a) is a magnified front view of the left end of the scaffolding board, and (b) is a magnified front view of the right end of the scaffolding board. [Figure 20] This is an enlarged bottom view with the intermediate sections omitted, showing both ends of the scaffolding plank. [Figure 21] This is an enlarged bottom view with the intermediate sections omitted, showing the left and right reinforcing members of the scaffolding board. [Figure 22] (a) is a vertical cross-sectional view along the line XXII-XXII in Figure 16(c), (b) is an enlarged view of the right half of (a), and (c) is an enlarged view of the left half of (a). [Figure 23] (a) is a vertical cross-sectional view along line aa in Figure 22(b), and (b) is a vertical cross-sectional view along line bb in Figure 22(c). [Figure 24] This is an enlarged front view with intermediate steps omitted, showing multiple identical scaffolding planks stacked on top of each other. [Figure 25] This is an enlarged side view with intermediate steps omitted, showing multiple identical scaffolding planks stacked on top of each other. [Figure 26] This is a vertical cross-sectional view showing multiple scaffolding boards stacked on top of each other, and is a vertical cross-sectional view at the cutting position corresponding to Figure 22. [Modes for carrying out the invention]

[0019] A scaffolding board according to an embodiment of this invention will be described below with reference to Figures 1 to 26. In the following explanation, the bottom of Figures 1(a), 2(a), 4, 16(a), and 18 will be referred to as the "front," and the top of the same figure as the "back." Left and right will refer to the left and right when viewed from the front (for example, the left and right of Figures 1(b), 2(b), 12, 13, 16(b), and 24).

[0020] <First Embodiment> Figures 1 to 15 show scaffolding boards according to the first embodiment of this invention. As shown in Figure 1, in the temporary scaffolding, multiple pairs of support columns (C1) are positioned in the front-to-back direction at predetermined intervals, and a horizontal strip of fabric (C2) is attached to each pair of support columns (C1). Then, two parallel strips of fabric (C2) adjacent to each other on the left and right are fitted with the scaffolding board (1) (a fabric frame with a floor) of this invention, respectively, to form a work platform.

[0021] Figures 2 and 3 show the overall configuration of a scaffolding board (1) according to the first embodiment of this invention. The illustrated scaffolding board (1) comprises a scaffolding board body (2) that is long in the left-right direction, two end frame members (3) that are long in the front-rear direction and attached to both left and right ends of the scaffolding board body (2), four fastening fittings (4A) (4B) that are attached to both left and right ends of the scaffolding board body (2) at intervals in the front-rear direction and are fastened to a cloth material (C2), and three reinforcing members (5) that are attached to the back side of the middle part of the length of the scaffolding board body (2) at intervals in the longitudinal direction. The scaffolding board body (2) is composed of two scaffolding board members (20) arranged in parallel front to back and connected to each other. Alternatively, the scaffolding board body may be composed of a single scaffolding board member (20).

[0022] Each scaffolding board (20) has a top plate (21) that is long in the left-right direction, two side wall portions (22) that extend downward from both the front and rear edges of the top plate portion (21), two bottom wall portions (23) that extend inward in the front-rear direction from the lower edges of the side wall portions (22), and two rising wall portions (24) that extend upward from the leading edges of both bottom wall portions (23). This scaffolding board (20) is formed by forming a high-tensile steel plate (more specifically, by roll forming, etc.). The high-tensile steel plate used as the forming material for the scaffolding board (20) preferably has a tensile strength of 500 MPa or more. Furthermore, the thickness of the high-tensile steel plate used as the forming material for the scaffolding board (20) is preferably 1 mm or less, and more preferably 0.8 mm or less. By using a high-tensile steel plate with the above thickness, it is possible to significantly reduce the weight of the scaffolding board (20).

[0023] The top plate portion (21) of the scaffolding board material (20) constitutes the tread surface of the scaffolding board (1) and is in the shape of a strip having a predetermined length and width. The length and width of the top plate portion (21) are set appropriately according to the size of the temporary scaffolding to be installed. Multiple upper weight-reducing holes (211) are formed in the top plate portion (21). The presence of these upper weight-reducing holes (211) reduces the weight of the scaffolding board material (20), and consequently reduces the overall weight of the scaffolding board (1). Furthermore, in this embodiment, the top plate portion (21) has three upper groove-shaped portions (212) that extend along its entire length and have a concave upper surface, spaced apart in the width direction. More specifically, the three upper groove-shaped portions (212) have a roughly V-shaped cross-section and are formed in the center of the front-to-back width of the top plate portion (21) and near both the front and rear edges. The formation of the upper groove-shaped portions (212) increases the strength of the top plate portion (21) against bending, twisting, etc. Note that the number of upper groove-shaped portions is not limited to three, but may be one, two, or four or more. In this embodiment of the scaffolding board (1), the aforementioned upper weight-reducing holes (211) are formed in the flat portion of the top plate portion (21) excluding the upper groove-shaped portion (212). More specifically, the upper weight-reducing holes (211) are circular in shape and are formed in large numbers at predetermined intervals in the left-right direction in a single row in the flat portion between the upper groove-shaped portions (212) on the front and rear outer sides of the top plate portion (21) and the front and rear edges close to them. In addition, in the flat portion between the upper groove-shaped portions (212) on the front and rear outer sides of the top plate portion (21) and the upper groove-shaped portion (212) in the center of the width, they are formed in two rows, front and rear, at predetermined intervals in the left-right direction, and the two rows are offset from each other in a staggered pattern. Furthermore, the upper weight-reducing holes (211) are formed by applying an upwardly convex (approximately frustoconical) embossing to the top plate portion (21) and punching out the top wall portion of the upwardly convex formed thereon. These upper weight-reducing 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 upwardly convex edge portions (211a) around the upper weight-reducing holes (211) can function as anti-slip portions. The shape, arrangement, number, etc. of the upper weight-reducing holes are not limited to the above embodiment and can be changed as appropriate.

[0024] The front and rear side walls (22) of the scaffolding board (20), together with the bottom wall (23), constitute the beam section of the scaffolding board (20). The height of the side walls (22) is usually 40 to 50 mm. In the middle of the vertical width of each front and rear side wall section (22), a side groove-shaped section (221) with a concave outer surface is formed along its entire length. The presence of this side groove-shaped section (221) increases the strength of the side wall section (22) against bending and twisting, and consequently increases the strength of the scaffolding board material (20) as a whole against bending and twisting. As shown in detail in Figure 10, the scaffolding board material (20) of this embodiment has a side groove-shaped portion (221) having a vertical groove bottom surface portion (221a) and two tapered groove side portions (221b) located on both the upper and lower sides of the groove bottom surface portion (221a) and inclined so as to gradually widen outward. With the side groove-shaped portion (221) in the above form, there are no places where the bending angle of the high-tensile steel plate becomes small (all bending locations are greater than 90°). Therefore, even when the thickness of the high-tensile steel plate used is reduced, the occurrence of forming defects such as cracks is suppressed, and a scaffolding board material (20) with excellent strength can be obtained. Furthermore, as will be described later, mounting bases (41) for the fastening brackets (4A) and (4B) are attached to the side wall portion (22) of the scaffolding board material (20). By making the side groove-shaped portion (221) in the above form, the mounting strength of the fastening brackets (4A) and (4B) can also be increased. As shown in the figure, multiple side-weight-reducing holes (222) are formed in the side wall portion (22) of the scaffolding board material (20) at intervals along its length. The presence of these side-weight-reducing holes (222) further reduces the weight of the scaffolding board material (20), thereby further reducing the overall weight of the scaffolding board (1). In the case of the scaffolding board (1) shown in the figure, the side-weight-reducing holes (222) are circular in shape and are formed in large numbers at predetermined intervals in the left-right direction on the groove bottom surface portion (221a) of the side groove-shaped portion (221). By forming the side-weight-reducing holes (222) on the groove bottom surface portion (221a) of the side groove-shaped portion (221), drilling is made easier, and the reduction in the strength of the side wall portion (22) due to the side-weight-reducing holes (222) is suppressed. Note that the shape, arrangement, number, etc. of the side-weight-reducing holes are not limited to the above embodiment and can be changed as appropriate. Furthermore, the side cutouts can be omitted.

[0025] The two lower wall sections (23) at the front and rear of the scaffolding board (20), together with the side wall section (22), constitute the beam section of the scaffolding board (20). The rising wall portion (24) extending upward from the leading edge of the lower wall portion (23) may be oriented vertically upward as shown in the figure, or it may be inclined outward or inward in the front-rear direction.

[0026] In the scaffolding board material (20) described above, all bending points of the high-tensile steel plate are given a radius (see Figure 10(b), etc.). The radius of curvature of the bending points is preferably 2 mm or more. With the above configuration, even when a high-tensile steel plate with a small plate thickness is used as the forming material for the scaffolding board material (20), the occurrence of forming defects such as cracks during the forming process is suppressed, and a lightweight and high-strength scaffolding board material (20) can be reliably obtained.

[0027] Figure 11 shows a modified example of the scaffolding board material in the scaffolding board of this invention. In the scaffolding board material (20X) of Figure 11, the upper edges of the two front and rear rising wall sections (24) are bent outward in the front-rear direction to form an outward bent edge section (25). The outward bent edge section (25) has a circular arc shape in cross-section. When workers hold the scaffolding board by hand during transport, erection, or removal, their fingers may get caught on the upper edges of the rising wall sections of the scaffolding board material. However, if an outward bent edge section (25) is formed as in the scaffolding board material (20X) described above, it becomes easier to hold and there is no risk of injuring the fingers.

[0028] The left and right end frame members (3) are attached to both the left and right ends (short sides) of the scaffolding board body (2) and constitute the horizontal crossbars of the scaffolding board body (2). Furthermore, in the case of the scaffolding board (1) of this embodiment, the end frame member (3) is attached across the ends of the two scaffolding board members (20) that constitute the scaffolding board body (2), and also has the function of connecting the two scaffolding board members (20). The two scaffolding board members (20) are connected such that a predetermined gap is created between them. 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 a strip-shaped plate extending in the front-to-back direction, with one side in the width direction (approximately half of the width) overlapping the end of the upper surface of the scaffolding board body (2), that is, the end (short side) of the upper plate portion (21) of the two front and rear scaffolding board members (20), and fixedly attached to the said end 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. The width of the lower plate portion (33) is approximately equal to the width of the portion of the upper plate portion (31) that is attached to the upper surface of the scaffolding board body (2).

[0029] Since scaffolding boards (1) are used in large quantities in temporary scaffolding, they are generally handled by stacking multiple boards (1) on top of each other during transportation and storage. Furthermore, when stacking multiple scaffolding boards (1) on top of each other, it is common practice to have only the bottom scaffolding board (1) with its underside facing upwards. In this case, the bottom scaffolding board (1) and the second-to-last scaffolding board (1) are stacked so that their undersides face each other. Therefore, if the scaffolding boards (1) shift horizontally when stacked vertically, it may cause problems during transportation and storage. In the case of the scaffolding boards (1) of this embodiment, by providing positioning means on the end frame members (3), it is possible to reliably prevent horizontal shifting when multiple boards are stacked vertically. More specifically, the scaffolding board (1) of this embodiment is provided with the above-mentioned positioning means: a first upper positioning portion (35a) consisting of an upwardly protruding portion formed near one of the two sets of diagonal portions of a virtual rectangle with the upper board portion (31) as its left and right sides, and at a position point-symmetric with respect to the center of the scaffolding board body (2); and a second upper positioning portion (35b) consisting of an upwardly opening recess (or hole) formed near the other set of diagonal portions of the scaffolding board body (2) and at a position point-symmetric with respect to the center of the scaffolding board body (2). Furthermore, the lower plate portion (33) of the two end frame members (3) is provided with a first lower positioning portion (36a) formed at a location corresponding to the first upper positioning portion (35a) when viewed from above, and consisting of a downward opening recess (or hole) that can be fitted into the upward opening recess (or hole) that constitutes the first upper positioning portion (35a), and a second lower positioning portion (36b) formed at a location corresponding to the second upper positioning portion (35b) when viewed from above, and consisting of a downward opening recess (or hole) that can be fitted into the upward opening recess (or hole) that constitutes the second upper positioning portion (35b). In this embodiment, two protruding portions (311) are formed on the upper plate portion (31) of each left and right end frame member (3), extending inward in the left-right direction from near both the front and rear ends. A first upper positioning portion (35a) and a second upper positioning portion (35b) are formed on these protruding portions (311). The protruding portions (311) are substantially rectangular in shape and are formed to be located above the upper groove-shaped portions (212) on both the front and rear outer sides of the top plate portion (21). With this configuration, the width of the upper plate portion (31) of the end frame member (3) does not increase as a result of forming the first upper positioning portion (35a) and the second upper positioning portion (35b), which in turn can contribute to reducing the weight of the scaffolding board (1). Furthermore, two protruding portions (331) are formed on the lower plate portion (33) of each left and right end frame member (3), extending inward in the left-right direction from near both the front and rear ends. A first lower positioning portion (36a) and a second lower positioning portion (36b) are formed on these protruding portions (331). The protruding portions (331) are roughly rectangular in shape and are formed to be located below the upper groove-shaped portions (212) on the front and rear outer sides of the top plate portion (21), corresponding to the two protruding portions (311) of the upper plate portion (31). With this configuration, the width of the lower plate portion (33) of the end frame member (3) does not increase as a result of forming the first lower positioning portion (36a) and the second lower positioning portion (36b), which in turn contributes to reducing the weight of the scaffolding board (1). The upward protrusion constituting the first upper positioning portion (35a) and the downward protrusion constituting the second lower positioning portion (36b) are identical in shape and size except for their vertical orientation. Furthermore, the upward opening recess constituting the second upper positioning portion (35b) and the downward opening recess constituting the first lower positioning portion (36a) are identical in shape and size except for their vertical orientation. In this embodiment, the upward projection (35a) and the downward projection (36b) are composed of projections with a substantially frustoconical shape, and the upward opening recess (35b) and the downward opening recess (36a) are composed of recesses with a substantially inverted frustoconical shape. Note that the upward projection, downward projection, upward opening recess, and downward opening recess are not limited to the illustrated form. Furthermore, the upward opening recess and the downward opening recess may be composed of through holes.

[0030] Figures 12-15 show the state in which the three scaffolding boards (1) of this embodiment are stacked vertically, with the lowest scaffolding board (1) and the middle (second from the bottom) scaffolding board (1) stacked so that their back surfaces face each other, and the middle scaffolding board (1) and the top scaffolding board (1) stacked so that their back surfaces face downwards (Figures 24-26, which show the stacked state of the scaffolding boards (1X) of the second embodiment described later, are similar). In the stacked configuration described above, positioning is performed between the intermediate scaffolding board (1) and the topmost scaffolding board (1) as follows: The first upper positioning portion (35a) of the intermediate scaffolding board (1) and the first lower positioning portion (36a) of the topmost scaffolding board (1) are fitted together, and the second upper positioning portion (35b) of the intermediate scaffolding board (1) and the second lower positioning portion (36b) of the topmost scaffolding board (1) are fitted together, thereby restricting the relative movement of both scaffolding boards (1) in the length and width directions (see Figures 13 and 14). Furthermore, in the case of the positioning means described above, since the two first upper positioning parts (35a), the second upper positioning part (35b), the first lower positioning part (36a), and the second lower positioning part (36b) are formed in point-symmetric positions with respect to the center of the scaffolding board body (2), even if the orientation of the stacked scaffolding boards (1) in the longitudinal direction is reversed left to right, they will fit together in the same way as described above, and the relative movement of both scaffolding boards (1) in the longitudinal and width directions will be restricted. Furthermore, positioning is performed between the intermediate scaffolding board (1) and the lowest scaffolding board (1), which are stacked with their backs facing each other, in the following manner. Specifically, the first lower positioning part (36a) of the lowest scaffolding board (1) and the second lower positioning part (36b) of the intermediate scaffolding board (1) are fitted together, and the second lower positioning part (36b) of the lowest scaffolding board (1) and the first lower positioning part (36a) of the intermediate scaffolding board (1) are fitted together, thereby restricting the relative movement of both scaffolding boards (1) in the length and width directions (see Figures 13 and 14). Even if the orientation of the scaffolding boards (1) stacked with their backs facing each other is reversed in the length direction, they are fitted together in the same manner as above, and the relative movement of both scaffolding boards (1) in the length and width directions is restricted.

[0031] The fastening brackets (4A) and (4B) are for erecting scaffolding boards (1) on fabric (C2), and include a fastening bracket body (40) having a mounting base (41) attached to the scaffolding board body (2) and a hook portion (42) that is hooked onto the fabric (C2), and a locking member (44) that is attached to the hook portion (42) so as to be vertically movable and prevents the hook portion (42) from coming off the fabric (C2) unintentionally.

[0032] The latching bracket body (40) is made by forming a metal plate such as a steel plate, and the mounting base (41) and hook portion (42) are integrally provided via intermediate connecting portions (43A) (43B). The mounting base (41) is a roughly vertical plate-shaped part that is long in the left-right direction. In the middle of the mounting base (41), two notches (411) are provided, cut out in a roughly arc shape from both the upper and lower edges. The inner ends of the mounting base (41) in the left-right direction are convex arc-shaped. The mounting base (41) is attached to the left and right ends of the inner surface of the two side wall portions (22) located at the front and rear ends of the scaffolding board body (2) among the front and rear side wall portions (22) of the two scaffolding board materials (20). More specifically, the mounting base (41) of the fastening bracket body (40) is superimposed on the inner surface of the groove bottom portion (221a) of the side groove-shaped portion (221) at each left and right end of the side wall portion (22), and is fixedly attached to the groove bottom portion (221a) by joining means such as rivets or welding. Of the four fastening brackets (4A) and (4B), the two fastening brackets (4A) located at diagonal positions on one side (left front and right rear in the diagram) have an intermediate connecting portion (43A) that is a short, vertical plate-shaped extension from the left-right outer end of the mounting base (41). On the other hand, of the two fastening brackets (4B) located at diagonal positions on the other side (left rear and right front in the diagram), the intermediate connecting portion (43B) is a short, vertical, bent plate-shaped extension that curves inward in a crank shape from the left-right outer end of the mounting base (41). When erecting multiple scaffolding boards (1) in a series in the left-right direction on a temporary scaffold, two fastening fittings (4A) and (4B) at the opposite ends of two scaffolding boards (1) are fastened to one strip member (C2). However, if the connecting parts (43A) and (43B) of the four fastening fittings (4A) and (4B) are configured as described above, the two scaffolding boards (1) can be erected in an orderly series without shifting them in the front-back direction. The hook portion (42) is roughly C-shaped and opens downward when viewed from the front. The middle portion (421) of the lower edge of the hook portion (42) is roughly semi-circular so that it can engage with the upper part of the outer surface of the fabric material (C2). The base portion (422) of the lower edge of the hook portion (422) extends diagonally upward toward the tip (outward in the left-right direction). The tip portion (423) of the lower edge of the hook portion (42) extends diagonally downward toward the tip. The upper edge of the hook portion (42) is roughly trapezoidal in shape with both left and right portions (424) (425) inclined. When multiple scaffolding boards (1) are stacked with their undersides facing downwards, the upper part of the hook portion (42) of the fastening fittings (4A) (4B) of the lower scaffolding board (1) fits into the lower part of the hook portion (42) of the fastening fittings (4A) (4B) of the upper scaffolding board (1) (see Figure 13). With the above configuration, when stacking multiple scaffolding boards (1) vertically, there is no need to shift them in the front-to-back width direction to prevent interference between the fastening fittings (4A) (4B), and they can be stacked neatly. Furthermore, when multiple scaffolding boards (1) are stacked with their undersides facing downwards, the left and right portions (424) and (425) of the upper edges of the hook portions (42) of the fastening fittings (4A) and (4B) of the lower scaffolding boards (1) can engage with the base portion (422) and tip portion (423) of the lower edges of the hook portions (42) of the fastening fittings (4A) and (4B) of the upper scaffolding boards (1) (see Figure 13). With the above configuration, the relative movement of the multiple scaffolding boards (1) stacked vertically is restricted by the engagement of the above portions (422), (423), (424), and (425) of the hook portions (42) with each other, thus preventing the scaffolding boards (1) from shifting during transportation or storage.

[0033] The locking member (44) is a vertical plate-shaped piece with two upper and lower arc-shaped through holes (441), and is attached to the base end portion of the hook portion (42) by mounting pins (45) (e.g., rivets) inserted through these through holes (441). When the hook portion (42) is not hooked onto the fabric material (C2), the locking member (44) is lowered by its own weight and in the locked position. When the fastening fittings (4A) and (4B) are hooked onto the fabric material (C2), when the hook portion (42) is brought closer to the fabric material (C2) from above, the lower end portion (442) of the locking member (44) is pressed against the fabric material (C2), causing the locking member (44) to move upward in a slight arc along the shape of the insertion hole (441), and the lower end portion (442) of the locking member (44) to disengage from the upper position of the fabric material (C2). If the hook portion (42) is then lowered further, the middle portion (421) of the lower edge of the hook portion (42) engages with the upper part of the outer surface of the fabric material (C2), and the hook portion (42) is hooked onto the fabric material (C2). When the hook portion (42) is hooked onto the fabric material (C2), no upward external force acts on the locking member (44), causing the locking member (44) to descend to the locked position by its own weight. As a result, the lower end portion (442) of the locking member (44) engages with the lower part of the outer surface of the fabric material (C2), so there is no risk of the fastening fittings (4A) and (4B) accidentally coming off the fabric material (C2). When removing the latching fasteners (4A) and (4B) from the fabric material (C2), the lock can be released by pushing the locking member (44) upward with your fingers.

[0034] In this embodiment of the scaffolding board (1), the locking members (44) of the four fastening brackets (4A) (4B) are all attached to the inner surface in the front-rear direction of the hook portion (42) (see Figures 3 to 6, etc.). With the above configuration, when multiple scaffolding boards (1) are stacked with their back surfaces facing downwards, the lower ends (442) of the locking members (44) of the two front-rear fastening brackets (4A) (4B) at each left and right end of the upper scaffolding board (1) engage with the upper part of the inner surface in the front-rear direction of the hook portions (42) of the two front-rear fastening brackets (4A) (4B) at each left and right end of the lower scaffolding board (1), thereby restricting the relative movement of both scaffolding boards (1) in the width direction (see Figures 13 and 14). Alternatively, the locking members (44) of all fastening brackets (4A) (4B) may be attached to the outer surface in the front-rear direction of the hook portion (42), and the same effect as above will be achieved in that case as well.

[0035] The reinforcing member (5) is provided on the underside of the middle section of the long scaffolding board body (2) and functions as a horizontal brace to reinforce the strength against bending, twisting, etc. Note that the number of reinforcing members to be installed is not limited to three as shown in the illustration of the scaffolding board (1), but may be one, two, or four or more. The reinforcing member (5) of this embodiment comprises a base portion (51) which is long in the front-rear direction and is joined to the lower surface of the lower wall portions (23) so as to connect all (four in this case) of the scaffolding board body (2), and one or more (two in this case) rising portions (52) which extend upward from the base portion (51) and whose upper ends are in contact with (or close to) the lower surface of the top plate portion (21) of each scaffolding board material (20). The reinforcing member (5) is formed, for example, by punching out a steel plate or the like into a predetermined shape and then performing a predetermined bending process. The base portion (51) is a strip-shaped plate with a length close to the front-to-back width of the scaffolding board body (2). In the base portion (51), the two intermediate length portions (51a) located between the two lower wall portions (23) of the two scaffolding board members (20) are slightly narrower than the other portions, namely the front and rear end portions and the length center portion (51b). The wide front and rear ends and the central part (51b) of the base section (51) are joined to the lower surfaces of the lower wall sections (23) of the two scaffolding boards (20) by joining means such as welding. The rising portion (52) extends upward from one edge of the narrow intermediate length portion (51a) of the base portion (51). The other edge of the narrow intermediate length portion (51a) is bent upward, thereby increasing the rigidity of the base portion (51). The rising section (52) is a vertical plate-like structure that is an isosceles trapezoid when viewed from the left or right. By making the shape of the rising section (52) an isosceles trapezoid as shown in the figure, it is possible to reliably reinforce the strength of the scaffolding board material (20) against bending and twisting while keeping the weight of the reinforcing member (5) down so as not to impair the lightweight nature of the scaffolding board (1). Furthermore, multiple weight-reducing holes (521) are formed in the portion of the rising section (52) excluding the four sides and the central part of its length. In the case of the reinforcing member (5) shown in the figure, the two weight-reducing holes (521) are symmetrical and have an unequal-legged trapezoidal shape. By forming weight-reducing holes (521) in the above portion of the rising section (52), the weight of the reinforcing member (5) can be further reduced without compromising the rigidity of the rising section (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 surface of the upper overhanging edge portion (53) is in contact with the lower surface of the top plate portion (21) of the scaffolding board material (20). The upper overhanging edge portion (53) is usually joined to the lower surface of the top plate portion (21) by joining means such as welding. In the case of the reinforcing member (5) shown in the figure, the upper end portion of the center of the front-to-back length of the rising portion (52) is cut out so as not to interfere with the upper groove-shaped portion (212) at the center of the width of the top plate portion (21) of the scaffolding board material (20), and therefore the upper overhanging edge portion (53) is divided into two parts, front and back.

[0036] The base portion (51) of the reinforcing member (5) is provided with a positioning portion (54) consisting of a downward-opening recess (or hole) located at a position corresponding to the upward-convex hole edge (211a) of a predetermined upper weight-reducing hole (211) in the top plate portion (21) of the scaffolding board material (20). More specifically, the positioning portion (54) consists of a downward-opening recess groove that is long in the front-rear direction and formed in the narrow, mid-length portion (51a) of the base portion (51). When two scaffolding boards (1) are stacked with their undersides facing downwards, the upper convex hole edge (211a) of the lower scaffolding board (1) is accommodated in the positioning portion (54) of the upper scaffolding board (1), thereby restricting the relative movement of both scaffolding boards (1) in the longitudinal direction (see Figure 15, etc.). In the case of the illustrated scaffolding board (1), the two upper convex hole edges (211a) formed at predetermined length positions on the top plate portion (21) of the two scaffolding board materials (20) are accommodated in each of the two front and rear positioning portions (54) of the reinforcing member (5). Furthermore, by changing the length and arrangement of the downward opening groove portion constituting the positioning portion (54) so ​​as to engage with the two upward convex hole edges (211a) on the outer side in the front-rear direction and / or the two upward convex hole edges (211a) on the inner side of the four upward convex hole edges (211a) that are accommodated, the relative movement of both scaffolding boards (1) in the width direction when stacked can also be restricted. In this embodiment, the scaffolding board (1) is also provided with the aforementioned positioning means (35a), (35b), (36a), and (36b) on the two end frame members (3). However, the positioning portion (54) of the reinforcing member (5) allows for smoother and more reliable positioning when multiple scaffolding boards (1) are stacked vertically. However, it is also possible to provide the positioning means on only one of the end frame members (3) or the reinforcing member (5).

[0037] According to the scaffolding board (1) of the first embodiment, the relative movement of the two scaffolding boards (1) in the length and width directions when two scaffolding boards (1) are stacked with their backs facing downwards is restricted by the first and second upper positioning parts (35a) and (35b) provided on the upper plate portion (31) of the end frame members (3) and the first and second lower positioning parts (36a) and (36b) provided on the lower plate portion (33) of the end frame members (3). Moreover, with the above-described scaffolding board (1), the above effect is achieved even when the orientation of the stacked scaffolding boards (1) in the length direction is reversed left to right. Furthermore, with the scaffolding board (1) of this embodiment, the relative movement of the two scaffolding boards (1) in the length and width directions when two scaffolding boards (1) are stacked with their backs facing each other is also restricted. Furthermore, according to the scaffolding board (1) of this embodiment, when two scaffolding boards (1) are stacked with their back surfaces facing downwards, the upwardly convex hole edge (211a) of the lower scaffolding board (1) is accommodated in the positioning portion (54) provided on the reinforcing member (5) of the upper scaffolding board (1), thereby restricting the relative movement of both scaffolding boards (1) in the longitudinal direction. This allows for smoother and more reliable positioning of the scaffolding boards (1).

[0038] <Second Embodiment> Figures 16 to 26 show scaffolding boards according to a second embodiment of this invention. The scaffolding board (1X) in this embodiment is substantially identical to the scaffolding board (1) in the first embodiment shown in Figures 1 to 16, except for the following points.

[0039] In the scaffolding board (1X) of the second embodiment, the upper plate portion (31) of the two left and right end frame members (3X) is provided with a positioning portion (37) consisting of an upwardly protruding portion. Furthermore, the lower plate portion (33) of the end frame members (3X) is not provided with a positioning portion like in the first embodiment. The positioning section (37) is configured such that when two scaffolding boards (1X) are stacked with their backs facing downwards, the positioning section (37) of the lower scaffolding board (1X) engages with the leading edges of the two lower wall sections (23) of the scaffolding board material (20) of the upper scaffolding board (1X), thereby restricting the relative movement of both scaffolding boards (1X) in the width direction. Furthermore, the positioning section (37) is configured such that when two scaffolding boards (1X) are stacked with their backs facing downwards, the positioning section (37) of the lower scaffolding board (1X) engages with the leading edge of the lower board section (33) of the upper scaffolding board (1X), thereby restricting the relative movement of both scaffolding boards (1X) in the length direction. More specifically, the upper plate portion (31) of the end frame members (3X) has an overhang portion (311X) along its entire length that is located inward in the left-right direction from the leading edge of the lower plate portion (33) when viewed from above. The overhang portion (311X) has an upwardly elongated protruding portion in the front-rear direction, and this upwardly elongated protruding portion constitutes a positioning portion (37). In the case of the end frame member (3X) shown, the positioning portion (37) consists of two upwardly elongated protruding portions formed in series on the overhang portion (311X) with a slight gap between them in the front-rear direction. The two upwardly elongated protruding portions (positioning portion (37)) are formed so as to be adjacent to the leading edges of the lower plate portions (33) of each of the two scaffolding board members (20) when viewed from above (see Figure 19, etc.). Furthermore, the two upward-protruding sections (positioning sections (37)) are formed such that, when viewed from above, both their front and rear ends are adjacent to the leading edges of the two front and rear lower wall sections (23) of each of the two scaffolding board members (20) (see Figure 17, etc.). Depending on the number of scaffolding board members constituting the scaffolding board body, there may be one or three or more positioning sections. The positioning section may be composed of four or more upward protrusions formed at locations adjacent to the leading edges of at least the two front and rear lower wall sections (23) of each scaffolding board (20) within the overhanging section (311X).

[0040] In this embodiment of the scaffolding board (1X), the reinforcing member (5) located in the middle of the length of the three reinforcing members provided on the back side of the middle portion of the length of the scaffolding board body (2) has the same structure as the three reinforcing members (5) of the scaffolding board in the first embodiment. On the other hand, the two reinforcing members (5X) on the left and right sides are located equidistant from the longitudinal center of the scaffolding board body (2) and form a pair. The base portion (51) of this pair of left and right reinforcing members (5X) has a first positioning portion (55a) consisting of a downward protrusion formed near one of the two sets of diagonal portions of a virtual rectangle with the base portion (51) as two sides, and at a point-symmetric position with respect to the center of the scaffolding board body (2), and a second positioning portion (55b) consisting of a downward opening recess (or hole) formed near the other set of diagonal portions of the scaffolding board body (2) and at a point-symmetric position with respect to the center of the scaffolding board body (2). Furthermore, as these positioning portions (55a) and (55b) are formed on the base portion (51) at the aforementioned locations (i.e., near both the front and rear ends of the base portion (51)), the positioning portion (54), which is also formed on the base portion (51) and consists of a downward-opening recessed portion, is made slightly shorter than the positioning portion (54) of the first embodiment. In this embodiment, the downward-protruding portion (55a) is composed of a projection with a substantially frustoconical shape, and the downward-opening recess (55b) is composed of a recess with a substantially inverted frustoconical shape. Note that the downward-protruding portion and the downward-opening recess are not limited to the illustrated forms. Also, the downward-opening recess may be composed of a through hole. When two scaffolding boards (1X) are stacked with their backs facing each other, the first positioning portion (55a) of the lower scaffolding board (1X) and the second positioning portion of the upper scaffolding board are fitted together, and the second positioning portion (55b) of the lower scaffolding board (1X) and the first positioning portion (55a) of the upper scaffolding board are fitted together, thereby restricting the relative movement of both scaffolding boards (1X) in the length and width directions (see Figure 26, etc.). Furthermore, since the first positioning portion (55a) and the second positioning portion (55b) of the pair of left and right reinforcing members (5X) are formed in point-symmetric positions with respect to the center of the scaffolding board body (2), even if the orientation of the stacked scaffolding boards (1) in the length direction is reversed left and right, they will fit together in the same way as described above, restricting the relative movement of both scaffolding boards (1) in the length and width directions. [Industrial applicability]

[0041] 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]

[0042] (1)(1X): Scaffolding board (2): Scaffolding board body (20)(20X): Scaffolding planks (21): Top plate (211): Weight reduction holes (211a): Upward convex edge of the hollowed-out hole (22): Side wall section (23):Lower wall part (3)(3X): End frame member (31): Upper plate section (311)(311X): Protruding section (32): Side plate part (33):Lower plate part (331): Protruding section (35a): First upper positioning portion (upward convex portion) (35b): Second upper positioning part (upper opening recess) (36a): First lower positioning portion (lower opening recess) (36b): Second lower positioning part (downward protrusion) (37): Positioning part (upward convex part) (4A)(4B): Locking bracket (5)(5X): Reinforcement member (51): Base section (54): Positioning section (downward opening groove section) (55a): First positioning portion (downward protrusion) (55b): Second positioning part (downward opening recess)

Claims

1. A scaffolding board body is made up of a single scaffolding board having a top plate that is long in the left-right direction, two side walls that extend downward from both the front and rear edges of the top plate, and two bottom walls that extend inward in the front-rear direction from the lower edges of the side walls, or multiple scaffolding boards arranged in parallel in the front-rear direction and connected to each other, It is equipped with two end frame members that are long in the front-to-back direction and attached to both the left and right ends of the scaffolding board body, The end frame member has an upper plate portion that is positioned and fixed to the upper surfaces of both the left and right ends of the scaffolding board body, a side plate portion that extends downward from the left and right outer edges of the upper plate portion, and a lower plate portion that extends inward in the left and right directions from the lower edges of the side plate portion. The upper plate portions of the two end frame members have a first upper positioning portion consisting of an upwardly protruding portion formed near one of the two sets of diagonal portions of a virtual rectangle with the upper plate portion as the two sides, and at a point-symmetric position with respect to the center of the scaffolding board body, and a second upper positioning portion consisting of an upwardly opening recess or hole formed near the other set of diagonal portions of the scaffolding board body, and at a point-symmetric position with respect to the center of the scaffolding board body. The lower plate portions of the two end frame members have a first lower positioning portion, which is formed at a location corresponding to the first upper positioning portion and consists of a downward opening recess or hole that can be fitted into an upward protrusion constituting the first upper positioning portion, and a second lower positioning portion, which is formed at a location corresponding to the second upper positioning portion and consists of a downward protrusion that can be fitted into an upward opening recess or hole constituting the second upper positioning portion. A scaffolding board characterized in that, when two scaffolding boards are stacked with their undersides facing downwards, the first upper positioning portion of the lower scaffolding board and the first lower positioning portion of the upper scaffolding board are fitted together, and the second upper positioning portion of the lower scaffolding board and the second lower positioning portion of the upper scaffolding board are fitted together, thereby restricting the relative movement of both scaffolding boards in the length and width directions.

2. The upward projection constituting the first upper positioning portion and the downward projection constituting the second lower positioning portion, and the upward opening recess or hole constituting the second upper positioning portion and the downward opening recess or hole constituting the first lower positioning portion are, respectively, the same shape and size except for the vertical orientation. The scaffolding board according to claim 1, wherein when two scaffolding boards are stacked with their backs facing each other, the first lower positioning portion of the lower scaffolding board and the second lower positioning portion of the upper scaffolding board are fitted together, and the second lower positioning portion of the lower scaffolding board and the first lower positioning portion of the upper scaffolding board are fitted together, thereby restricting the relative movement of both scaffolding boards in the length and width directions.

3. The scaffolding board according to claim 1, wherein the upper plate portion of the end frame member has two protruding portions that extend inward in the left-right direction from near both the front and rear ends, and a first upper positioning portion and a second upper positioning portion are formed on both protruding portions.

4. The scaffolding board according to claim 1, wherein the lower plate portion of the end frame member has two protruding portions that extend inward in the left-right direction from near both the front and rear ends, and a first lower positioning portion and a second lower positioning portion are formed on both protruding portions.

5. A scaffolding board body is formed by arranging a single scaffolding board material, or by arranging multiple scaffolding boards in parallel and connecting them to one another, having a long top plate portion in the left-right direction with multiple weight-reducing holes formed on the edge of the hole portion, two side walls extending downward from both front and rear edges of the top plate portion, and two bottom walls extending inward in the front-rear direction from the lower edges of the side walls portion, The scaffolding board body is equipped with reinforcing members, one or more of which are attached to the underside of the middle section of the board at intervals along its length. The reinforcing member has a long, plate-like shape in the front-to-back direction and a base portion that is joined to the lower surface of the lower wall portion so as to connect all of the lower wall portions of the scaffolding board body. At least one of the reinforcing members has a positioning portion consisting of a downward-opening recess or hole located at a position corresponding to the upward-convex edge of the weight-reducing hole, A scaffolding board characterized in that, when two scaffolding boards are stacked with their undersides facing downwards, the upper convex edge of the weight-reducing hole of the lower scaffolding board is accommodated in the positioning portion of the upper scaffolding board, thereby restricting at least the relative movement in the length direction of the two scaffolding boards, of which the relative movement in the length direction and the width direction is restricted.

6. The scaffolding board according to claim 5, wherein the positioning portion consists of a downwardly opening recessed portion that is elongated in the front-to-back direction and formed in the base portion of the reinforcing member.

7. A scaffolding board body is made up of a single scaffolding board having a top plate that is long in the left-right direction, two side walls that extend downward from both the front and rear edges of the top plate, and two bottom walls that extend inward in the front-rear direction from the lower edges of the side walls, or multiple scaffolding boards arranged in parallel in the front-rear direction and connected to each other, It is equipped with two end frame members that are long in the front-to-back direction and attached to both the left and right ends of the scaffolding board body, The end frame member has an upper plate portion that is positioned and fixed to the upper surface of both the left and right ends of the scaffolding board body. The upper plate portion of the end frame member is provided with a positioning portion consisting of an upwardly protruding portion. The positioning section is configured such that, when two scaffolding boards are stacked with their undersides facing downwards, the positioning section of the lower scaffolding board engages with the leading edges of the two lower wall portions of the scaffolding board material of the upper scaffolding board, thereby restricting the relative movement of both scaffolding boards in the width direction.

8. The end frame member further comprises a side plate portion extending downward from the left-right outer edge of the upper plate portion, and a lower plate portion extending inward in the left-right direction from the lower edge of the side plate portion. The scaffolding board according to claim 7, wherein the positioning portion is configured such that when two scaffolding boards are stacked with their undersides facing downwards, the positioning portion of the lower scaffolding board engages with the leading edge of the lower portion of the upper scaffolding board, thereby restricting the relative movement of both scaffolding boards in the longitudinal direction.

9. The upper plate portion has a protruding portion along its entire length that is located inward in the left-right direction from the leading edge of the lower plate portion when viewed from a plane. The scaffolding board according to claim 8, wherein the positioning portion consists of an upwardly protruding ridge that is long in the front-to-back direction and formed on the protruding portion of the upper board.

10. A scaffolding board body is formed by arranging a single scaffolding board material having a top plate that is long in the left-right direction, two side walls that extend downward from both the front and rear edges of the top plate, and two bottom walls that extend inward in the front-rear direction from the lower edges of the side walls, or by arranging two of the scaffolding board materials in parallel in the front-rear direction and connecting them to each other, The scaffolding board body is equipped with multiple reinforcing members attached at intervals along its length to the underside of the middle section, Each reinforcing member has a long, plate-like shape in the front-to-back direction and a base portion that is joined to the lower surface of the lower wall portion so as to connect all of the lower wall portions of the scaffolding board body. The multiple reinforcing members include a pair of left and right reinforcing members located equidistant from the center of the scaffolding board body in the longitudinal direction. The base portion of a pair of left and right reinforcing members has a first positioning portion consisting of a downward protrusion formed near one of the two sets of diagonal portions of a virtual rectangle with the base portion as two sides, and at a point-symmetric position with respect to the center of the scaffolding board body, and a second positioning portion consisting of a downward opening recess or hole formed near the other set of diagonal portions of the scaffolding board body, and at a point-symmetric position with respect to the center of the scaffolding board body. A scaffolding board characterized in that, when two scaffolding boards are stacked with their backs facing each other, the first positioning portion of the lower scaffolding board and the second positioning portion of the upper scaffolding board are fitted together, and the second positioning portion of the lower scaffolding board and the first positioning portion of the upper scaffolding board are fitted together, thereby restricting the relative movement of both scaffolding boards in the length and width directions.

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