Scaffold board of work scaffold

Abstract

To provide a highly usable scaffold board whose length can be smoothly adjusted over a long period of time.SOLUTION: A scaffold board comprises: a pair of scaffold board bodies 2A, 2B which are long in a longitudinal direction and whose opposing ends 5, 6 are connected so that they can slide in a longitudinal direction; a handrail 3 which is erected along side frames 9 of the scaffold board bodies 2A, 2B; and a connecting hook 4 which can be engaged with an installation target portion P. The handrail 3 has a plurality of posts 32. The scaffold board bodies 2A, 2B have a plurality of sockets 12 which are provided at the side frames 9 and support the posts 32. The sockets 12 has a fixing pin 35 which engages with a pin engaging portion 34 provided in the post 32 and can hold the post 32 in a non-slip state; Among the posts 32, an intermediate post 32A which is arranged near a connecting portion J1 between the scaffold board bodies 2A, 2B has a loose fitting hole as the pin engaging portion 34, which allows the intermediate post 32A to move up and down within a specified range while the fixing pin 35 is engaged.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a scaffolding board for a work scaffold used in interior construction work on a staircase of a building. [Background technology]

[0002] A scaffolding board for work scaffolding that is set up when carrying out interior construction work on the staircases of buildings such as high-rise buildings and apartment buildings has been proposed that is configured so that its length can be adjusted to match the length of the stairs (for example, Patent Document 1).

[0003] The scaffolding board (work floor) of Patent Document 1 is provided with two scaffolding board bodies (upper work floor, lower work floor) stacked on top of each other in two levels. The scaffolding board body has a pair of side frames (long frame members) with an I-shaped cross section arranged in parallel on the left and right, a plurality of crosspieces (horizontal frames) extending between the side frames, and a metal panel attached between a ladder-shaped framework formed by the side frames and crosspieces, and is hooked and held by a connecting piece (support member) fixed to the side frame of the other scaffolding board body so as to be slidable in the longitudinal direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Application Publication No. 5-042505 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when the scaffold board body of this type is extended in the longitudinal direction, the overlapping area between the side frames is correspondingly reduced, and the bending rigidity in the vertical direction is reduced. Therefore, when the scaffold board is repeatedly used, the overlapping area may bend downward and plastically deform due to the load applied to the scaffold board, making it difficult to smoothly adjust the length.

[0006] In addition, in this type of scaffolding board, when a handrail is attached to the side frame of the scaffolding board body, the rigidity of the handrail increases the bending rigidity of the entire scaffolding board to some extent. However, when the handrail is connected and fixed to the side frame, the difference in bending rigidity between the handrail and the side frame causes twisting deformation at the connection, which may impair smooth length adjustment.

[0007] The present invention has been made in consideration of the above problems, and aims to provide a highly usable scaffolding board whose length can be smoothly adjusted over a long period of time. [Means for solving the problem]

[0008] In order to solve the above problems, the scaffolding board of the present invention employs the following technical measures.

[0009] The scaffolding board of the present invention comprises a pair of scaffolding board bodies which are long in the fore-and-aft direction and whose opposing ends are connected so as to be slidable in the fore-and-aft direction, a handrail which is erected along the side frames of the scaffolding board bodies, and a connecting hook which can be engaged with a target part to be erected, wherein the handrail has a plurality of posts, the scaffolding board body is provided with a plurality of sockets on the side frames and supports the posts, the sockets have fixing pins which engage with pin engaging portions provided on the posts to hold the posts in a non-slip state, and among the posts, intermediate posts which are arranged near the connection portions between the scaffolding board bodies have loose fitting holes as the pin engaging portions which enable the intermediate posts to move up and down within a specified range when the fixing pins are engaged.

[0010] The intermediate support may have a loose fitting hole having a vertically long hole shape as the pin engagement portion. good.

[0011] The intermediate support may have the pin engagement portion on at least one of a front peripheral portion and a rear peripheral portion.

[0012] The socket may be provided on a side surface portion on an outer side in the left-right direction of the side frame. Effect of the Invention

[0013] According to the scaffolding board of the present invention, the side frames are less likely to deform even after long-term use and the length can be smoothly adjusted, thereby improving usability. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a partially exploded perspective view of a scaffolding board according to an embodiment. [Diagram 2] FIG. 2 is a partially exploded oblique view of a scaffolding board with the third scaffolding board body removed. [Diagram 3] FIG. 4 is a longitudinal cross-sectional view of the periphery of a first connecting portion as viewed from the front. [Figure 4] FIG. 4 is a partially exploded perspective view of the periphery of a first connecting portion. [Diagram 5] FIG. [Figure 6] FIG. 2 is a cross-sectional view of the socket and its periphery viewed from above. [Figure 7] This is a vertical cross-sectional view from the front around the side frame when scaffolding boards are stacked one on top of the other. [Figure 8] FIG. 11 is a partially exploded perspective view of the periphery of a first connecting portion, showing a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example of the present invention, and the configuration of the present invention is not limited to this specific example.

[0016] The scaffolding board 1 of this embodiment is a scaffolding board used by bridging between work scaffolding (platforms) installed on the upper and lower landings of a staircase, mainly when carrying out interior construction work on the staircases of buildings such as high-rise buildings and apartment buildings, and as shown in Figure 1, it is equipped with multiple scaffolding board bodies 2A, 2B, 2C, a handrail 3, and a connecting hook 4.

[0017] The scaffolding board bodies 2A, 2B, and 2C are plate members that are long in one direction and are arranged in a row in the longitudinal direction. In this embodiment, the longitudinal direction of the scaffolding board bodies 2A, 2B, and 2C (the direction of the arrows X1 and X2 in FIG. 1) is the front-rear direction of the scaffolding board 1, the short side direction of the scaffolding board bodies 2A, 2B, and 2C (the direction of the arrows Y1 and Y2 in FIG. 1) is the left-right direction of the scaffolding board 1, and the normal direction of the upper surface of the scaffolding board bodies 2A, 2B, and 2C (the direction of the arrows Z1 and Z2 in FIG. 1) is the up-down direction of the scaffolding board 1.

[0018] Of the scaffolding board bodies 2A, 2B, and 2C, the first scaffolding board body 2A and the second scaffolding board body 2B are connected to each other at their front and rear opposing ends 5, 6 so as to be slidable in the front-rear direction. That is, the front end 6 of the second scaffolding board body 2B is connected to the rear end 5 of the first scaffolding board body 2A so as to be slidable in the front-rear direction. In this way, the scaffolding board 1 of this embodiment is configured so that its length can be adjusted in the front-rear direction in accordance with the separation distance of the beam parts P of the working scaffold, which is the part to be erected.

[0019] Of the scaffold board bodies 2A, 2B, and 2C, the first scaffold board body 2A and the third scaffold board body 2C have their opposing front and rear ends 7, 8 removably connected to each other. That is, the rear end 8 of the third scaffold board body 2C is removably connected to the front end 7 of the first scaffold board body 2A. FIG. 2 shows the scaffold board 1 in a state in which the third scaffold board body 2C has been removed. In this way, the scaffold board 1 of this embodiment is configured so that one of the scaffold board bodies 2A, 2B, and 2C (the third scaffold board body 2C) is detachably attached in accordance with the separation distance of the beam parts P.

[0020] As shown in Fig. 1, each of the scaffolding board bodies 2A, 2B, and 2C has a pair of left and right side frames 9, a number of crosspieces 10 and treads 11, and sockets 12 that support the handrails 3. The two side frames 9 are arranged parallel to each other and spaced apart from each other on the left and right. The crosspieces 10 and the treads 11 are each arranged horizontally between the left and right side frames 9.

[0021] The connecting hook 4 is a substantially C-shaped member that can be hooked onto the beam P of the work scaffold, and is provided on the front end 7 of the first scaffold board body 2A, the rear end 13 of the second scaffold board body 2B, and the front end 14 of the third scaffold board body 2C. Therefore, as shown in FIG. 1, when the third scaffold board body 2C is connected to the first scaffold board body 2A, the scaffold board 1 is erected by hooking the connecting hook 4 provided on the rear end 13 of the second scaffold board body 2B and the connecting hook 4 provided on the front end 14 of the third scaffold board body 2C to the beam P, respectively. On the other hand, as shown in FIG. 2, when the third scaffold board body 2C is detached from the first scaffold board body 2A, the scaffold board 1 is erected by hooking the connecting hook 4 provided on the rear end 13 of the second scaffold board body 2B and the connecting hook 4 provided on the front end 7 of the first scaffold board body 2A to the beam P, respectively.

[0022] As shown in FIG. 1, the socket 12 is provided in one or more of the left and right side frames 9 (first side frame 9A, second side frame 9B, third side frame 9C) of the scaffold board main body 2A, 2B, 2C. In this embodiment, the socket 12 is provided at the rear end 5 of the first side frame 9A of the first scaffold board main body 2A, at a position closer to the front end 7 than the center between the front and rear of the first side frame 9A, at the rear end 13 of the second side frame 9B of the second scaffold board main body 2B, at the rear end 8 of the third side frame 9C of the third scaffold board main body 2C, and at a substantially center position between the front and rear of the second side frame 9B. The detailed configuration of the socket 12 will be described later.

[0023] As shown in Figure 3, the first side frame 9A of the first scaffolding board main body 2A is a frame material having an approximately rectangular C-shaped cross section, and has an outer frame side panel 15 that forms the outer side portion of the first side frame 9A in the left-right direction, an outer frame upper panel 16 that forms the upper surface of the first side frame 9A, and an outer frame lower panel 17 that forms the lower surface of the first side frame 9A.

[0024] As shown in Figures 3 and 4, the first side frame 9A has a fixing bracket 18. The fixing bracket 18 is provided at the rear end 5 of the first side frame 9A on the outer frame side plate 15. As shown in Figure 3, the fixing bracket 18 in this embodiment is a bolt member (a member formed by fastening a flat head bolt to an eye nut) with a tip 18T formed in a flat dish shape, and is screwed and connected to the outer frame side plate 15 in a position in which the tip 18T protrudes from the outer frame side plate 15 to the inside in the left-right direction of the first scaffolding board main body 2A.

[0025] As shown in Fig. 3, the outer frame upper plate 16 extends from the upper edge of the outer frame side plate 15 toward the inside in the left-right direction of the first scaffolding board main body 2A. A protrusion 16P is provided on the upper surface of the outer frame upper plate 16. The protrusion 16P is formed in a flattened, generally trapezoidal shape in cross section, and extends in the front-rear direction along the center between the left and right of the outer frame upper plate 16. The outer frame upper plate 16 is provided with an upper rail portion 19 along the inner edge in the left-right direction. The treads 11 are supported by the upper rail portion 19 at their left and right ends.

[0026] The outer frame lower plate 17 extends from the lower edge of the outer frame side plate 15 toward the inside in the left-right direction of the first scaffolding board main body 2A. A recess 17P is provided on the underside of the outer frame lower plate 17. The recess 17P is formed in a flattened, generally trapezoidal shape in cross section, and extends in the front-rear direction along the center between the left and right of the outer frame lower plate 17. A lower rail portion 20 is provided along the inner edge in the left-right direction of the outer frame lower plate 17. The rails 10 are supported by the lower rail portions 20 at the left and right ends.

[0027] The second side frame 9B of the second scaffold board body 2B is inserted and held in the space inside the first side frame 9A of the first scaffold board body 2A. That is, the first side frame 9A and the second side frame 9B are arranged in a longitudinal direction (front-rear direction) The fixing bracket 18 is configured as an inner and outer double frame that is length-adjustable in the extension direction (in the extension direction). The fixing bracket 18 fixes the sliding position (extended position) of the second side frame 9B relative to the first side frame 9A by pressing a tip portion 18T against the second side frame 9B.

[0028] The second side frame 9B is a frame material having a roughly I-shaped cross section, and has an inner frame middle plate 21, an inner frame upper plate 22 that forms the upper surface of the second side frame 9B, and an inner frame lower plate 23 that forms the lower surface of the second side frame 9B.

[0029] The inner frame middle plate 21 is provided with a middle crosspiece 24 along the inner side surface of the second side frame 9B in the left-right direction. The middle crosspiece 24 extends from a position lower than the center between the top and bottom of the inner frame middle plate 21 toward the inner side surface of the second side frame 9B in the left-right direction. The crosspieces 10 and the treads 11 are supported by the middle crosspiece 24 at their left and right ends. The tip 18T of the fixing bracket 18 is disposed opposite the lateral position of the middle crosspiece 24 on the outer side surface of the inner frame middle plate 21 in the left-right direction. Therefore, when the fixing bracket 18 is tightened, the tip 18T is pressed against the portion of the middle crosspiece 24 on the outer side surface of the inner frame middle plate 21 in the left-right direction. This makes it difficult for the second side frame 9B to deform even if a pressing force is applied from the fixing bracket 18 for a long period of time.

[0030] The inner frame upper plate 22 is disposed facing the lower part of the outer frame upper plate 16 of the first side frame 9A in the space inside the first side frame 9A. The inner frame lower plate 23 is disposed facing the upper part of the outer frame lower plate 17 of the first side frame 9A in a state where it is inserted into the space inside the first side frame 9A. Therefore, when the first side frame 9A and the second side frame 9B bend in the up-down direction, the inner frame upper plate 22 comes into surface contact with the outer frame upper plate 16, or the inner frame lower plate 23 comes into surface contact with the outer frame lower plate 17.

[0031] As shown in FIG. 1, at least a part of the rear end of the third side frame 9C of the third scaffold board body 2C is inserted and held from the front end side in the space inside the first side frame 9A. The third side frame 9C is connected in a non-detachable state by a connector 25 provided at the front end 7 of the first side frame 9A. The connector 25 in this embodiment is a toggle pin, and after being inserted between the first side frame 9A and the third side frame 9C, the hook part at the tip is bent to prevent the third side frame 9C from moving in the front-rear direction relative to the first side frame 9A. The connector 25 is not limited to a toggle pin, and may be a slide pin provided so as to be movable in the left-right direction or the up-down direction relative to the first side frame 9A, or may be a screw member screwed and connected to the first side frame 9A from the left-right direction or the up-down direction.

[0032] The third side frame 9C is made of a frame material having a cross-sectional structure common to the second side frame 9B of the second scaffolding board body 2B. The third side frame 9C may have a cross-sectional structure different from that of the second side frame 9B of the second scaffolding board body 2B as long as it has a predetermined bending rigidity or more in the vertical direction.

[0033] The handrail 3 is erected along the left and right side frames 9 (first side frame 9A, second side frame 9B, third side frame 9C) of the scaffold board main body 2A, 2B, 2C. The handrail 3 of this embodiment is composed of a main handrail 3D erected from the first side frame 9A to the second side frame 9B, and an auxiliary handrail 3E erected on the third side frame 9C, which are separate bodies. The handrail 3 may be integrally constructed from the first side frame 9A to the third side frame 9C.

[0034] The handrail 3 has a handrail main body 31 and multiple posts 32. The handrail main body 31 is a frame material formed by bending a substantially cylindrical tubular body into a substantially U-shape, and has two horizontal rails 33 arranged vertically and spaced apart from each other and substantially parallel to each of the side frames 9 of the scaffolding board main bodies 2A, 2B, and 2C. The posts 32 are substantially cylindrical tubular bodies and extend downward from the horizontal rails 33 of the handrail main body 31.

[0035] The horizontal rail 33 of the main handrail 3D is configured as an inner and outer double cylinder having an outer cylinder portion 33A and an inner cylinder portion 33B inserted into the outer cylinder portion 33A. The handrail 3 of this embodiment is thus configured to be length adjustable in the front-rear direction in accordance with the sliding position of the second scaffolding board body 2B relative to the first scaffolding board body 2A.

[0036] In this embodiment, the support pillars 32 are approximately cylindrical tubular bodies and are vertically installed at a position near the rear end of the handrail body 31 of the main handrail 3D, a position near the connection between the outer tube portion 33A and the inner tube portion 33B, and at the front end position, and at an approximately central position between the front and rear of the handrail body 31 of the auxiliary handrail 3E, and at the front end position.

[0037] 4 to 6, the support 32 has a pin engagement portion 34. The pin engagement portion 34 is a through hole into which a fixing pin 35 provided in the socket 12 can be inserted, and is provided on both the front peripheral portion 32F and the rear peripheral portion 32R of the support 32. Note that the pin engagement portion 34 may be provided on only one of the front peripheral portion 32F and the rear peripheral portion 32R of the support 32.

[0038] As shown in Figures 1, 2, and 4, among the pillars 32, the intermediate pillar 32A arranged near the connection part (first connection part) J1 between the first scaffolding board main body 2A and the second scaffolding board main body 2B has a loose fitting hole as a pin engagement part 34 that enables the intermediate pillar 32A to move up and down within a specified range when the fixed pin 35 is engaged.

[0039] 4 and 6, the intermediate support 32A has, as the pin engagement portion 34, a loose-fitting hole having a lateral width larger than the outer diameter of the shaft portion 36 of the fixed pin 35 and a long hole shape that is long in the vertical direction. In this manner, the intermediate support 32A is configured to be vertically movable within a predetermined range when the fixed pin 35 is engaged with the intermediate support 32A.

[0040] The above-mentioned predetermined range that allows the intermediate support 32A to move up and down is set to a range that can prevent the upper edge of the pin engagement portion (loose fitting hole) 34 from being pressed against the shaft portion 36 of the fixed pin 35 from above when the handrail 3 is bent downward due to the load applied to the handrail 3 during normal use. As a result, even if a load is applied from above to the scaffolding board main bodies 2A, 2B and the handrail 3 during use, or if twisting occurs in the first connecting portion J1, stress is not directly transmitted from the intermediate support 32A to the side frame 9. Therefore, deformation of the side frame 9 is less likely to occur at the first connecting portion J1.

[0041] 1, 5 and 6, in this embodiment, the pillars 32 other than the intermediate pillar 32A have, as the pin engagement portion 34, a circular hole larger than the outer diameter of the shaft portion 36 of the fixing pin 35. The pin engagement portion 34 of the intermediate pillar 32A is formed in the shape of an elongated hole that is larger in the vertical direction than the pin engagement portions 34 of the pillars 32 other than this intermediate pillar 32A.

[0042] Incidentally, among the pillars 32, the pillars 32 arranged near the mutual connection part (second connection part) J2 between the first scaffolding board body 2A and the third scaffolding board body 2C may have loose fitting holes as pin engagement parts 34 that allow the pillars 32 to move up and down, similar to the intermediate pillars 32A. This makes it possible to suppress the direct transmission of stress from the pillars 32 arranged near the second connection part J2 to the side frame 9 even if a load is applied from above to the scaffolding board bodies 2A, 2C and the handrail 3 during use, or if a twist occurs in the second connection part J2. Therefore, deformation of the side frame 9 is less likely to occur at the second connection part J2.

[0043] As shown in Figs. 4 and 5, the socket 12 is formed in a tubular shape that opens upward. The socket 12 of this embodiment is formed in a substantially cylindrical shape that opens upward and downward. In detail, as shown in Fig. 6, the socket 12 of this embodiment is formed in a substantially elliptical tubular shape that opens upward and downward and is flat in the left-right direction. The socket 12 is provided in the outer frame side plate 15 of the first side frame 9A in the first scaffold board body 2A, the inner frame middle plate 21 of the second side frame 9B in the second scaffold board body 2B, and the inner frame middle plate 21 of the third side frame 9C in the third scaffold board body 2C.

[0044] The inner diameter of the socket 12 is set to be larger than the outer diameter of the support 32. In the present embodiment, the socket 12 has a minor diameter (inner diameter in the left-right direction) of the inner circumference set to be larger than the outer diameter of the support 32. Therefore, the support 32 is held in a loosely inserted state inside the socket 12. This allows the handrail 3 to be smoothly attached to and detached from the socket 12 even if the support 32 is slightly deformed. The minor diameter of the inner circumference of the socket 12 may be set to be approximately the same as the outer diameter of the support 32. Even with this configuration, the major diameter of the inner circumference of the socket 12 (inner diameter in the front-rear direction) is set to be larger than the outer diameter of the support 32, so there is little frictional resistance when inserting and removing the support 32. Therefore, the handrail 3 can be smoothly attached to and detached from the socket 12. In addition, by setting the minor diameter to be approximately the same as the outer diameter of the support 32, the handrail 3 is also prevented from wobbling in the left-right direction during use.

[0045] The socket 12 has a flat portion 12S that faces the outer circumferential surface of the support 32 from the outside in the radial direction. More specifically, the socket 12 has flat portions 12S at the left and right positions of the inner circumferential surface. In this embodiment, the flat portions 12S are provided at two vertices on the short diameter side of the inner circumferential surface of the socket 12. The flat portions 12S extend in the vertical direction between the upper and lower ends of the socket 12. Therefore, even if the support 32 is slightly tilted in the front-rear direction, it will contact along the flat portion 12S. This makes it possible to more reliably suppress wobbling of the handrail 3 in the left-right direction when in use.

[0046] As shown in FIG. 7, the length L1 of the socket 12 (the dimension between the upper and lower ends) is set to be equal to or less than the vertical width L2 of the first side frame 9A (the dimension between the upper and lower end faces). When multiple scaffold boards 1 are stacked vertically, the first side frames 9A of the upper and lower scaffold boards 1 are stacked vertically in parallel. However, in the scaffold board 1 of this embodiment, the length L1 of the socket 12 is set to be equal to or less than the vertical width L2 of the first side frame 9A, so that even if multiple scaffold boards are stacked vertically as described above, the sockets 12 of the upper and lower scaffold boards 1 do not interfere with each other. Therefore, the scaffold boards can be stacked stably without wobbling.

[0047] In addition, when multiple scaffold boards 1 are stacked vertically as described above, the upper and lower scaffold boards 1 overlap with the convex parts 16P and concave parts 17P provided on the first side frame 9A engaged with each other. That is, the upper scaffold board 1 overlaps with the lower scaffold board 1 in a state where it is prevented from moving in the left-right direction. This allows for more stable stacking.

[0048] As shown in FIG. 6, the socket 12 has a fixing pin 35, a protrusion 37, a pin insertion hole 38, and a mounting flange 39. The fixing pin 35 is an eyebolt having a male threaded shaft 36, and is provided on the front 12F or rear 12R of the periphery of the socket 12. More specifically, the fixing pin 35 is screwed to a flat surface 37S formed on the front or rear of the protrusion 37 from the outside of the socket 12 in the front-rear direction. The fixing pin 35 is screwed to the socket 12 from one side in the front-rear direction (the front or rear of the outer periphery of the socket 12), and is further inserted into the pin engagement portion 34 of the support 32. As a result, the support 32 is fixed to the socket 12 in a non-dislodging state. The fixing pin 35 may be provided on the outer peripheral portion of the socket 12 (the outer position in the left-right direction of the scaffolding board main body 2A, 2B, 2C).

[0049] The protrusion 37 is formed in a substantially rectangular U-shape in cross section, and is formed on both the front peripheral portion 12F and the rear peripheral portion 12R of the socket 12, bulging outwardly from the periphery and extending in the vertical direction. This makes it difficult for the socket 12 to deform even if a load is applied so as to tilt the socket 12 in the front-to-rear direction relative to the support 32. The protrusion 37 may be formed on only one of the front peripheral portion 12F and the rear peripheral portion 12R of the socket 12, or may be provided on the outer peripheral portion of the socket 12 (the outer position in the left-right direction of the scaffolding board main body 2A, 2B, 2C).

[0050] The pin insertion hole 38 is a screw hole into which the fixing pin 35 can be screwed, and is provided in the flat surface portion 37S of one of the front and rear protrusions 37. The pin insertion hole 38 may be provided in the flat surface portions 37S of both the front and rear protrusions 37, or may be provided in a peripheral portion of the socket 12 other than the protrusion 37.

[0051] As shown in Figs. 4 to 6, a pair of mounting flanges 39 are provided on the inner peripheral portion of the socket 12 (inner position in the left-right direction of the scaffolding board main body 2A, 2B, 2C) at the front and rear. The mounting flanges 39 are substantially flat plate pieces extending from the inner peripheral portion toward both the front and rear, and are fixed in a face-to-face state to the outer frame side plate 15 of the first side frame 9A, the inner frame middle plate 21 of the second side frame 9B, and the inner frame middle plate 21 of the third side frame 9C. As a result, even if a load is applied to the socket 12 from the front-to-back direction or the left-to-right direction, no stress is directly applied to the upper and lower outer frame parts (outer frame upper plate 16, outer frame lower plate 17) of the first side frame 9A, and the upper and lower inner frame parts (inner frame upper plate 22, inner frame lower plate 23) of the second side frame 9B. Therefore, deformation of the side frame 9 is unlikely to occur at the first connecting portion J1.

[0052] The pin insertion hole 38 may be a loose-fitting hole that allows the support 32 to move up and down within a predetermined range when the fixed pin 35 is engaged with the pin engagement portion 34. In detail, as shown in Fig. 8, in the scaffolding board 1 of this modified example, among the sockets 12, the intermediate socket 12A arranged in the vicinity of the connecting portion J1 between the first scaffolding board main body 2A and the second scaffolding board main body 2B has, as the pin insertion hole 38, a loose-fitting hole that allows the intermediate support 32A (support 32) inserted and supported in the intermediate socket 12A to move up and down within a predetermined range when the fixed pin 35 is engaged with the pin engagement portion 34.

[0053] The pin insertion holes 38 of the intermediate socket 12A are opened in the flat portions 37S of the protrusions 37 on both the front and rear sides of the intermediate socket 12A. These pin insertion holes 38 are formed as elongated holes that are longer in the up-down direction and have a width greater than the outer diameter of the fixing pin 35. Similarly, the pin engagement portions 34 of the intermediate support 32A are opened in both the front peripheral portion 32F and the rear peripheral portion 32R of the intermediate support 32A. These pin engagement portions 34 have circular holes that are approximately the same in diameter as the outer diameter of the fixing pin 35.

[0054] The fixing pin 35 of this modification is a toggle pin, and is inserted through the pin insertion hole 38 and the pin engagement portion 34 from the front-rear direction, and then the hook portion at the tip is bent. As a result, with the fixing pin 35 engaged with the pin engagement portion 34, the intermediate support 32A is held in the intermediate socket 12A so as to be movable up and down within a predetermined range and prevented from coming off. Therefore, the same effects as those of the above embodiment are achieved.

[0055] The pin insertion hole 38 of the intermediate socket 12A may be formed as a circular loose-fitting hole that allows the intermediate support 32A to move up and down within a predetermined range with the fixed pin 35 inserted therein. The pin insertion holes 38 of the sockets 12 other than the intermediate socket 12A may be formed as elongated holes similar to the pin insertion hole 38 of the intermediate socket 12A, or may be formed as circular holes larger than the outer diameter of the fixed pin 35.

[0056] In particular, the pin insertion holes 38 of the sockets 12 arranged near the connecting part (second connecting part) J2 between the first scaffolding board main body 2A and the third scaffolding board main body 2C are loosely fitted holes that allow the up and down movement of the posts 32 supported by the sockets 12, so that even if a load is applied from above to the scaffolding board main bodies 2A, 2C and the handrail 3 during use or if the second connecting part J2 is twisted, it is possible to suppress the direct transmission of stress from the sockets 12 arranged near the second connecting part J2 to the side frame 9. Therefore, deformation of the side frame 9 is less likely to occur at the second connecting part J2.

[0057] In this way, the scaffolding board 1 of this embodiment is long in the front-rear direction and has opposite ends 5 and 6 in the front-rear direction. The scaffolding board has a pair of scaffolding board bodies 2A, 2B connected to each other so that they can slide in the forward and backward directions, a handrail 3 erected along the side frames 9 of the scaffolding board bodies 2A, 2B, and a connecting hook 4 that can be engaged with the target part P to be erected, the handrail 3 has a plurality of posts 32, the scaffolding board bodies 2A, 2B are each provided with a plurality of sockets 12 on the side frames 9 and support the posts 32, the sockets 12 have fixing pins 35 that engage with pin engaging portions 34 provided on the posts 32 and can hold the posts 32 in a non-dislodging state, and among the posts 32, an intermediate post 32A arranged in the vicinity of the connecting portion J1 between the scaffolding board bodies 2A, 2B has a loose fitting hole as the pin engaging portion 34 that allows the intermediate post 32A to move up and down within a predetermined range when the fixing pin 35 is engaged.

[0058] According to this scaffolding board 1, even if a load is applied from above to the scaffolding board main bodies 2A, 2B and the handrail 3 during use, or even if the first connecting parts J1 of the scaffolding board main bodies 2A, 2B are twisted, the stress is not directly transmitted to the side frames 9 via the pin engagement parts 34 of the intermediate supports 32A, so that the side frames 9 are unlikely to deform even with repeated use. This allows smooth length adjustment over a long period of time, improving usability.

[0059] The intermediate support 32A has, as a pin engagement portion 34, a loose-fitting hole having an elongated hole shape that is long in the vertical direction.

[0060] According to this scaffolding board 1, when a load is applied from above to the first connecting part J1 of the scaffolding board main body 2A, 2B during use, it is possible to reliably prevent the stress from being transmitted directly to the side frame 9 via the pin engagement part 34 of the intermediate support 32A, so that the side frame 9 is less likely to deform and the length can be adjusted smoothly over a long period of time.

[0061] The intermediate support 32A has a pin engagement portion 34 on at least one of a front peripheral portion 32F and a rear peripheral portion 32R.

[0062] According to this scaffolding board 1, when a load is applied to the intermediate support 32A during use so as to tilt it in the forward / backward direction, the stress can be reliably prevented from being transmitted to the side frame 9 via the pin engagement portion 34, so that the side frame 9 is less likely to deform and the length can be adjusted smoothly over a long period of time.

[0063] The sockets 12 are provided on the outer side surface portions 15, 21 of the side frame 9 in the left and right direction.

[0064] According to this scaffolding board 1, when a load is applied to the intermediate support 32A during use so as to tilt it in the forward / backward or left / right direction, the stress can be prevented from being directly applied from above or below to the upper and lower surfaces of the side frame 9, making deformation of the side frame 9 even less likely to occur and allowing the length to be adjusted smoothly over a long period of time.

[0065] The scaffold board 1 of the above-mentioned modified example is provided with a pair of scaffold board bodies 2A, 2B that are long in the front-rear direction and whose opposing ends 5, 6 are connected to each other so as to be slidable in the front-rear direction, a handrail 3 that is erected along the side frames 9 of the scaffold board bodies 2A, 2B, and a connecting hook 4 that can be hooked onto the target part P to be erected. The handrail 3 has a plurality of posts 32, and the scaffold board bodies 2A, 2B have a plurality of sockets 12 that are provided on the side frames 9 and support the posts 32, and the sockets 12 are pins that are provided on the posts 32. The intermediate socket 12A has a fixed pin 35 that can engage with the pin engagement portion 34 to hold the support 32 in a non-slip state, and a pin insertion hole 38 through which the fixed pin 35 can be inserted.Of the sockets 12, the intermediate socket 12A arranged in the vicinity of the connection portion J1 between the scaffolding board main bodies 2A, 2B has a loose fitting hole as the pin insertion hole 38 that allows the support 32 supported by the intermediate socket 12A to move up and down within a specified range when the fixed pin 35 is engaged with the pin engagement portion 34.

[0066] According to this scaffolding board 1, even if a load is applied from above to the scaffolding board main bodies 2A, 2B and the handrail 3 during use, or even if a twist occurs in the first connecting part J1 of the scaffolding board main bodies 2A, 2B, Because the stress is not directly transmitted to the side frames 9 through the pin insertion holes 38 of the intermediate socket 12A, the side frames 9 are less likely to deform even with repeated use. This allows smooth length adjustment over a long period of time, improving usability.

[0067] The intermediate socket 12A has, as the pin insertion hole 38, a loose-fitting hole having an elongated hole shape that is long in the vertical direction.

[0068] According to this scaffolding board 1, when a load is applied from above to the first connecting part J1 of the scaffolding board main body 2A, 2B during use, it is possible to reliably prevent the stress from being transmitted directly to the side frame 9 through the pin insertion hole 38 of the intermediate socket 12A, so that the side frame 9 is less likely to deform and the length can be adjusted smoothly over a long period of time.

[0069] In this embodiment, the scaffold board 1 has a second scaffold board body 2B connected to the first scaffold board body 2A so that it can slide in the fore-and-aft direction, and a third scaffold board body 2C connected to the first scaffold board body 2A so that it can be attached and detached. However, as shown in Figure 2, the scaffold board 1 does not have a detachable third scaffold board body 3C, and may be composed of two scaffold board bodies 2A, 2B connected to be slidable in the fore-and-aft direction.

[0070] The pin engagement portion 34 of the intermediate support 32A may be formed in an elongated hole shape having a lateral width substantially the same as the outer diameter of the shaft portion 36 of the fixing pin 35, or may be formed in an elongated hole shape or a circular shape that is at least larger in the vertical direction than the pin engagement portions 34 of the other supports 32, so long as the pin engagement portion 34 can hold the intermediate support 32A in a non-dislodging state when the fixing pin 35 is engaged and can allow the intermediate support 32A to move vertically within a predetermined range. This provides the same operational effects as the scaffolding board 1 of the above embodiment.

[0071] The pin engagement portion 34 of the intermediate support 32A is not limited to a through hole, and may be a groove-like or circular recess that is long in the vertical direction and recessed into the circumferential surface of the support 32, so long as it can hold the intermediate support 32A in a non-dislodging state when the fixing pin 35 is engaged and can allow the intermediate support 32A to move up and down within a predetermined range. This provides the same effects as the scaffolding board 1 of the above embodiment.

[0072] All the posts 32 of the handrail 3, like the intermediate post 32A, may have, as the pin engagement portion 34, a slot-shaped or circular loose-fitting hole that allows the post 32 to move up and down within a predetermined range when the fixed pin 35 is engaged. This provides the same effect as the scaffolding board 1 of the above embodiment. [Explanation of symbols]

[0073] 1 Scaffolding board 2A First scaffolding board body 2B Second scaffolding board body 2C 3rd scaffolding board body 3. Handrails 4 Connecting Hooks 9 Side frame 10. 11 Treadboard 12 Sockets 12S flat part 15 Outer frame side plate 16 Outer frame upper plate 17 Outer frame bottom plate 18 Fixing bracket 31 Handrail body 32 Pillar 32A Intermediate post 32F Front circumference 32R rear circumferential surface 33 Crosspiece 34 Pin engagement part 35 Fixing pin 36 Shaft 37 Protrusion 37S flat part 38 Pin insertion hole J1 1st connection part (connection part) P Beam section (construction target section)

Claims

1. A pair of scaffolding board bodies that are long in the front-rear direction and whose opposing ends are connected to each other so as to be slidable in the front-rear direction, a handrail that is erected along the side frames of the scaffolding board bodies, and a connecting hook that can be hooked onto a target part to be erected, The handrail has a plurality of posts, The scaffolding board body has a plurality of sockets provided on the side frame and supporting the posts, The socket has a fixing pin that can be engaged with a pin engagement portion provided on the support and can hold the support in a non-removable state, Among the supports, the intermediate support arranged near the connection portion between the scaffolding board bodies has a loose fitting hole as the pin engagement portion, which enables the intermediate support to move up and down within a specified range when the fixed pin is engaged.

2. The scaffolding board according to claim 1 , wherein the intermediate support has a loose-fitting hole having a vertically long hole shape as the pin engagement portion.

3. The scaffolding board according to claim 1 , wherein the intermediate support has the pin engagement portion at least on one of the front and rear peripheral portions.

4. The scaffolding board according to any one of claims 1 to 3, wherein the socket is provided on the outer side portion of the side frame in the left and right directions.

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