End members of suspended scaffolding joists

Abstract

To provide an end member of a joist for a suspended scaffold, which enables the work of fixing the joist to a sleeper of the suspended scaffold and the work of removing the joist from the sleeper to be performed easily and in a short time.SOLUTION: An end member 25 is placed at an end of a joist body 24 of a joist 13 which constitutes a floor part of a suspended scaffold suspended by a suspending member together with a sleeper 12, and has an insertion part 33 inserted inside the sleeper. The sleeper is a channel member with a lip part in which each tip of a pair of lip parts 22 provided in an opening 21 opened upward is a hanging part 22b. The insertion part has: a first extension part 33a inserted between two hanging parts of the tips of the pair of lip parts and extending downward parallel or nearly parallel to the hanging part; and a second extension part 33b extending obliquely downward from a lower end of the first extension part to a lower side of one hanging part of the two hanging parts, and the second extension part reaches the lower side of one hanging part by elastic deformation of the insertion part, etc.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an end member of a joist for a suspended scaffold that is combined and connected to the joists of the suspended scaffold from above. [Background technology]

[0002] Conventionally, when repair or inspection work is carried out at high altitudes on structures such as bridges or highways, suspended scaffolding has been used as the scaffolding for carrying out work. A suspended scaffolding comprises a suspension member whose upper end is attached to an H-shaped steel beam or the like of the structure as a suspended scaffolding support member located above the work site, and a floor portion supported by the suspended scaffolding support member via the suspension member.

[0003] As described in Patent Document 1, for example, the floor portion is composed of a plurality of joists arranged horizontally and supported by the suspended scaffolding support members via the above-mentioned hanging members, a plurality of floor joists spanning between these joists, and a plurality of floor panels placed on and fixed to these floor joists. The joist disclosed in Patent Document 1 is formed from a channel member having an opening that opens upward. A pair of lips facing each other is provided at the opening of the joist. The tips of these lips form plate-like hanging portions that extend downward within the channel member. In other words, the channel member that constitutes the joist is a lip-equipped channel member in which two parallel hanging portions form the opening edge.

[0004] The joist is composed of a joist body that extends horizontally, perpendicular to the longitudinal direction of the joists, and end members attached to both ends of the joist body. The end members have insertion sections that are inserted into the openings of the joists from above. These insertion sections are inserted between the two hanging parts of the joists. When attaching a joist to a joist, the insertion portion of the end member is inserted into the opening of the joist, and the joist and joist are fastened to the joist with, for example, a gauge wire. In addition to gauge wire, special fastening hardware may also be used to fasten the joist to the joist. When the joist is fastened to the joist using gauge wire and fastening hardware, it is necessary to cut the gauge wire or remove the fastening hardware when removing the joist from the joist, for example, when dismantling the suspended scaffolding. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3798591 Summary of the Invention [Problem to be solved by the invention]

[0006] In the conventional suspended scaffolding constructed as described above, there was a problem that the work of fixing the joists to the joists and removing the joists from the joists was cumbersome. In addition, when fixing the joists to the joists or removing the joists at high altitudes, the work had to be done carefully so that the wires and fixing brackets would not fall, which was a problem that the work took a long time.

[0007] The object of the present invention is to provide an end member for a joist for a suspended scaffold that enables the work of fixing the joist to the joists of the suspended scaffolding and the work of removing the joist from the joists to be performed easily and in a short time. [Means for solving the problem]

[0008] In order to achieve this object, the end member of a joist for a suspended scaffolding according to the present invention is an end member that is arranged at the end of the joist body of a joist that, together with the joists, forms the floor part of the suspended scaffolding suspended by a suspension member, and is equipped with an insertion portion that is inserted into the inside of the joist, wherein the joist is a channel member with a pair of lips that are provided opposite each other at an opening that opens upward, and each tip of the lip portions serves as a hanging portion, and the insertion portion is inserted between the two hanging portions at the tips of the pair of lip portions, and the end member of a joist for a suspended scaffolding is equipped with a first extension portion that extends downward parallel or approximately parallel to the hanging portion, and a second extension portion that extends diagonally downward from the lower end of the first extension portion to the underside of one of the two hanging portions.

[0009] In the present invention, in the end member of the joist for suspended scaffolding, the insertion portions may be multiple in the width direction of the joist body, and all of the insertion portions may have the first extension portion and the second extension portion.

[0010] In the present invention, in the end member of the suspended scaffolding joist, the number of the insertion portions may be two, and a protruding piece portion may be provided between these insertion portions that protrudes upward and abuts against the end surface of the floor panel placed on the floor portion to prevent the floor panel from shifting.

[0011] In the present invention, the end member of the joist for the suspended scaffolding may be fixed to the end of the joist body.

[0012] In the present invention, the end member of the scaffolding joist may be arranged at the end of the joist body so as to be rotatable around an axis member whose axial direction is in the up-and-down direction.

[0013] In the present invention, in the end member of the joist for suspended scaffolding, the length of the joist body may be extendable.

[0014] In the present invention, in the end member of the joist for the suspended scaffolding, when the joist body is extendable, the joist body is configured by an inner tube made of a square pipe that is inserted into an outer tube made of a square pipe at one end and fitted movably with the other end protruding outside the outer tube, and the outer tube has a slit extending from one end to the other end, and has a stopper that crosses the slit at the end where the inner tube protrudes, and the inner tube may have a convex body that fits into the slit.

[0015] The present invention may further provide a locking mechanism in the end member of the suspended scaffolding joist, which is provided at the end of the outer tube from which the inner tube protrudes or in the vicinity of the end, and the locking mechanism may be composed of a through hole connecting the inside and outside of the outer tube, a screw seat having a screw hole that opens toward the through hole, and a screw member that screws into the screw seat and has its tip inserted into the through hole and faces the inner tube.

[0016] In the present invention, in the end member of the joist for suspended scaffolding, the joist is provided with a reinforcing member that connects the pair of lip portions, and the number of the insertion portions is at least two, provided in the width direction of the joist body, and the two insertion portions may be inserted at a position adjacent to the reinforcing member between the pair of lip portions. [Effects of the Invention]

[0017] According to the present invention, it is possible to provide an end member for a joist for a suspended scaffolding that allows the work of fixing the joist to the joist of the suspended scaffolding and the work of removing the joist from the joist to be performed easily and in a short time. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a perspective view showing a part of a suspended scaffolding using end members of floor joists according to the first embodiment. [Figure 2] FIG. 2 is a perspective view showing the configuration of the floor portion of the suspended scaffolding. [Figure 3]FIG. 3 is a plan view showing the connection portion between the joists and the beams. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is an exploded perspective view of the end member of the floor joist as viewed obliquely from above. [Figure 7] FIG. 7 is an exploded perspective view of the end member of the floor joist as viewed obliquely from below. [Figure 8] FIG. 8 is a cross-sectional view of the joist and the end member of the joist during the process of attaching the joist to the joist. [Figure 9] FIG. 9 is a perspective view of a part of a joist having a reinforcing member and a part of a floor joist before installation. [Figure 10] FIG. 10 is a perspective view of a portion of a joist having a reinforcing member and a portion of a floor joist after installation. [Figure 11] FIG. 11 is a perspective view showing a part of a joist and a joist having an end member according to the second embodiment. [Figure 12] FIG. 12 is a perspective view of the connection portion between the joists and the floor joists. [Figure 13] FIG. 13 is a plan view for explaining the range of rotation of the end member of the floor joist. [Figure 14] FIG. 14 is a cross-sectional view of the connection portion between the joist and the outer cylinder of the floor joist. [Figure 15] FIG. 15 is a cross-sectional view of the connection between the joist and the inner tube of the floor joist. [Figure 16] FIG. 16 is an exploded perspective view of the connecting portion between the joists and the outer cylinder of the floor joist, as viewed obliquely from above. [Figure 17] FIG. 17 is an exploded perspective view of the connecting portion between the joists and the outer cylinder of the floor joist, as viewed obliquely from below. [Figure 18] FIG. 18 is a perspective cross-sectional view showing a part of a floor joist body in section. [Figure 19] FIG. 19 is a plan view showing an example of use of a joist having end members for the joist according to the second embodiment. [Figure 20]FIG. 20 is a plan view showing an example of using joists that are perpendicular to the joists. DETAILED DESCRIPTION OF THE INVENTION

[0019] (First embodiment) Hereinafter, one embodiment of an end member for a suspended scaffolding joist according to the present invention will be described in detail with reference to Figs. The suspended scaffolding 1 shown in Figure 1 comprises a plurality of suspension members 3 extending downward from the suspended scaffolding support member 2 shown at the top in Figure 1, and a floor portion 4 attached to the lower ends of the suspension members 3.

[0020] The suspended scaffolding support member 2 is, for example, an H-shaped steel beam that constitutes a high part of a structure such as a bridge or a highway. In this embodiment, the hanging members 3 are made up of chains, and are attached via clamps 5 to positions spaced apart at predetermined intervals along the length of the suspended scaffolding support member 2. Note that instead of chains, wires can also be used as the hanging members 3. The lower end of the hanging member 3 is passed through a hanging fitting 6 provided on the floor portion 4, and is connected to the floor portion 4 via the hanging fitting 6. In order to keep the floor portion 4 in a horizontal state, the hanging members 3 are attached to each of the multiple suspended scaffolding support members 2, and are attached to each of the multiple positions aligned at predetermined intervals in the longitudinal direction of each suspended scaffolding support member 2.

[0021] The floor portion 4 comprises a plurality of floor panels 11 arranged in the longitudinal direction of the suspended scaffolding support member 2 and in a horizontal direction perpendicular to the longitudinal direction, and a plurality of joists 12 and floor joists 13 that support these floor panels 11. Figure 1 shows the state in which one floor panel 11 located at the front side in Figure 1 has been removed. The floor panel 11 is formed in a strip shape from a wooden or metal plate material. The floor panel 11 of the suspended scaffolding 1 according to this embodiment is used with its longitudinal direction extending horizontally, perpendicular to the longitudinal direction of the suspended scaffolding support member 2.

[0022] The joists 12 and floor joists 13 are used in combination as shown in Figures 2(A) to 2(C). Figure 2(A) is a perspective view showing a part of the floor section 4, Figure 2(B) is an exploded perspective view showing the state in which the floor panels 11 have been removed from the joists 12 and floor joists 13, and Figure 2(C) is an exploded perspective view showing the state in which the floor joists 13 have been removed from the joists 12. Note that Figures 2(A) to 2(C) show fewer floor panels 11 placed on the floor joists 13 than in Figure 1 to make it easier to understand the configuration of the floor section 4. Also, the floor panels 11 shown in Figure 2 are shown with a simplified structure.

[0023] In this embodiment, the joists 12 are arranged to extend parallel to the longitudinal direction of the floor panel 11 (from the lower left to the upper right in FIG. 2). The joists 13 are arranged to extend horizontally at right angles to the joists 12, and are bridged between two adjacent joists 12. The floor panel 11 is placed on the joists 13 in a state where it extends parallel to the joists 12, and is fixed to the joists 12 and 13 by fixing metal fittings (not shown).

[0024] As shown in Figs. 2(A) to 2(C), the joist 12 is made up of a channel member with a lip portion. In this embodiment, the joists 12 are used as a single assembly, with other joists 12 connected to their ends via joints 14 (see Figure 1). The above-mentioned hanging fittings 6 are attached to these joists 12. The spacing between the multiple joists 12 aligned in the longitudinal direction of the suspended scaffolding support member 2 is set to a predetermined interval by spacing members 15. This spacing is such that a predetermined number of floor panels 11 can be laid between two adjacent joists 12.

[0025] The spacing members 15 are made of round pipes and are fixed to support clamps 16 attached to the joists 12. The distance between two joists 12 is determined by fixing one spacing member 15 to a plurality of support clamps 16 provided for each joist 12. In addition to determining the distance between the joists 12 as described above, the spacing members 15 also have the function of preventing the floor panels 11 from lifting up when wind pressure is applied to the floor panels 11 from below, for example.

[0026] As shown in Figures 3 and 4, the lip-equipped channel member constituting the joist 12 is a channel member having an opening 21 that opens upward, with a pair of lips 22 provided at the opening 21. More specifically, the joist 12 is composed of a main body 23 that has a U-shaped cross section that opens upward, and a pair of lips 22 provided at the upper end of the main body. The lip 22 is formed by a horizontal portion 22a that extends horizontally from the upper end of the main body 23 toward the center of the joist 12 in the width direction, and a hanging portion 22b that extends downward from the tip of the horizontal portion 22a. The opening 21 is formed between the hanging portion 22b of one lip portion 22 and the hanging portion 22b of the other lip portion 22.

[0027] 2(B) and (C), the joists 13 that form the floor section 4 together with the joists 12 are composed of a joist body 24 made of a square pipe and end members 25 provided at both ends of the joist body 24. In this embodiment, the end members 25 are fixed to the ends of the joist body 24 by welding. The joists 13 are attached to the joists 12 by overlapping the end members 25 onto one lip portion 22 of the joists 12 from above. End member 25 is formed by bending a metal plate into a predetermined shape, and is structured to detachably engage from above with one lip portion 22 of joist 12. As shown in Figures 3 to 7, end member 25 in this embodiment is formed by a fixing portion 31 made of a flat plate that is fixed to joist main body 24 by welding, a placing portion 32 that extends horizontally from the upper end of fixing portion 31 to the opposite side of joist main body 24, an insertion portion 33 that extends downward from the tip of placing portion 32, and a protruding piece portion 34 that extends upward from the tip of placing portion 32.

[0028] The fixing portion 31 is inclined in the vertical direction. The inclination of the fixing portion 31 is such that it gradually moves away from the joist 12 as it extends downward. A notch 35 is formed at the lower end of the fixing portion 31, as shown in Figures 6 and 7. The insertion portion 33 is configured to be inserted between the two hanging portions 22b of the joist 12 and engage with the lip portion 22 when the end member 25 is attached to the joist 12.

[0029] More specifically, insertion portion 33 has a first extending portion 33a extending downward from mounting portion 32 in parallel or approximately parallel to hanging portion 22b, and a second extending portion 33b extending obliquely downward from the lower end of first extending portion 33a to the underside of one of two hanging portions 22b that is closest to joist body 24. Second extending portion 33b essentially functions as the engaging portion. Hereinafter, one of two hanging portions 22b that is closest to joist body 24 will be simply referred to as "engaging hanging portion 22b."

[0030] The insertion portions 33 in this embodiment are provided at multiple locations on the mounting portion 32 in the width direction of the joist body 24 (the longitudinal direction of the joists 12). The number of insertion portions 33 in this embodiment is two. That is, the end member 25 in this embodiment has multiple (two) insertion portions 33, and all of the insertion portions 33 have a first extension portion 33a and a second extension portion 33b. The two insertion portions 33 in this embodiment are positioned at both ends of the mounting portion 32 in the width direction of the joist body 24.

[0031] First extension portion 33a is positioned so as to overlap engaging hanging portion 22b of joist 12 in the installed state. The installed state here refers to a state in which the spacing setting members 15 are attached to two joists 12 connected by joists 13, and the spacing between these two joists 12 cannot be changed. As shown in FIG. 4, in a state in which end member 25 is attached to joist 12, the tip end portion of second extending portion 33b overlaps with engaging hanging portion 22b when viewed from below.

[0032] The protruding piece 34 is provided between the two insertion portions 33. The protruding piece 34 in this embodiment is formed by partially cutting and raising the center portion of the mounting portion 32. As shown in Figure 5, this protruding piece 34 abuts against the end surface 11a of the floor panel 11 arranged on the floor portion 4, and prevents the floor panel 11 from shifting in the longitudinal direction of the joist 13, that is, in the direction toward the joists 12.

[0033] To assemble the suspended scaffolding 1 configured in this manner, first, multiple joists 12 are suspended from suspended scaffolding support members 2 via hanging members 3, and then multiple joists 13 are attached to these joists 12 at predetermined intervals in the longitudinal direction of the joists 12. When attaching the joists 13 to the joists 12, end members 25 of the joists 13 are placed on the joists 12 from above. This operation is performed by inserting the insertion portion 33 of the end member 25 from above between the two hanging portions 22b of the joists 12. By inserting the insertion portion 33 between the two hanging portions 22b in this manner, the second extension portion 33b enters below the engaging hanging portion 22b and engages with the engaging hanging portion 22b.

[0034] After assembling a plurality of joists 13 between two joists 12, a plurality of floor panels 11 are placed and fixed on the joists 13. When placing the floor panels 11 on the joists 13, the end faces 11a of the floor panels 11 are placed against the protruding pieces 34 of the end members 25 to determine the position of the floor panels 11. After a plurality of floor panels 11 are laid between two joists 12, spacing members 15 are attached to these two joists 12. By attaching the spacing members 15 to the joists 12 in this way, movement of one joist 12 relative to the other joist 12 is restricted.

[0035] When an additional joist 13 is added to two joists 12 whose spacing is determined by spacing member 15, placing end member 25 on joist 12 from above causes second extending portion 33b to abut the tip of horizontal portion 22a of lip portion 22, as shown in FIG. 8. In this case, by pushing end member 25 downward, the tip of second extending portion 33b slides along the boundary between horizontal portion 22a and engaging hanging portion 22b, and insertion portion 33 lowers while elastically deforming in a direction away from fixed portion 31. Engaging hanging portion 22b also elastically deforms, and by further pushing end member 25 downward with inserting portion 33 elastically deformed, second extending portion 33b enters below engaging hanging portion 22b and engages with engaging hanging portion 22b, as shown in FIG. 4, first extending portion 33a overlaps engaging hanging portion 22b, and mounting portion 32 of end member 25 overlaps horizontal portion 22a of lip portion 22. This engagement of second extending portion 33b with engaging hanging portion 22b also occurs in common joist 13 that is spanned across two joists 12 before the interval is set by interval setting member 15.

[0036] In this state where joist 13 is attached to joists 12, even if joist 13 is pushed upward by wind pressure, for example, and end member 25 moves upward relative to joist 12, second extension portion 33b will abut engaging hanging portion 22b from below, restricting further movement of end member 25. Therefore, in this embodiment, second extension portion 33b of end member 25 functions as a stopper for joist 13, so that after joist 13 is attached to joist 12, the conventional work of fixing joist 13 to joist 12 with wire or fixing hardware is not required.

[0037] When removing joist 13 from joists 12 when dismantling suspended scaffolding, end member 25 is pulled upward relative to joists 12. This operation causes insertion portion 33 of end member 25 to bend, while second extension portion 33b moves upward along engaging hanging portion 22b, and end member 25 is released upward from joists 12. This allows joist 13 to be easily removed from joists 12. Therefore, according to this embodiment, it is possible to provide an end member for a joist for a suspended scaffold that allows the work of fixing the joist 13 to the joists 12 of the suspended scaffolding and the work of removing the joist 13 from the joists 12 to be performed easily and in a short time.

[0038] In this embodiment, the end member 25 has a plurality of insertion portions 33 arranged in the width direction of the joist body 24, and all of the insertion portions 33 have a first extension portion 33a and a second extension portion 33b. Therefore, the plurality of second extension portions 33b can prevent the end member 25 from coming off the joists 12, which increases reliability in preventing the end member 25 from coming off.

[0039] The number of insertion portions 33 of the end member 25 in this embodiment is two. A protruding piece 34 is provided between these insertion portions 33, protruding upward and coming into contact with the end face 11a of the floor panel 11 placed on the floor portion 4 to prevent the floor panel 11 from shifting. Therefore, when placing the floor panel 11 on the joist 13, the end face 11a of the floor panel 11 can be brought into contact with the protruding piece 34, allowing the floor panel 11 to be easily placed in a predetermined position. This makes it possible to provide an end member for a joist for a suspended scaffold that can not only be easily fixed to the joists 12, but also allows the floor panel 11 to be easily installed. Furthermore, the end member 25 according to this embodiment is arranged by being fixed to the end of the common joist body 24. Therefore, the common joist 13 according to this embodiment can be easily manufactured.

[0040] (Modified joist type) The joists can be configured as shown in Figures 9 and 10. In Figures 9 and 10, members that are the same as or equivalent to those described with reference to Figures 1 to 8 are given the same reference numerals, and detailed descriptions thereof will be omitted where appropriate. 9 and 10 is provided with a reinforcing plate 36 that reinforces the upper end of the joist 12 where the opening 21 is formed. This reinforcing plate 36 corresponds to the "reinforcing member" of the present invention. The reinforcing plate 36 is made of a flat metal plate, and is placed between the pair of lip portions 22 with its main surface perpendicular to the longitudinal direction of the joist 12 and extending in the vertical direction. One side of the reinforcing plate is welded to one of the hanging portions 22b, and the other side is welded to the other hanging portion 22b. By welding the reinforcing plate 36 to the pair of hanging parts 22b, the gap between the lip parts 22 is less likely to widen, and the upper end part (opening side end part) of the joist 12 can be reinforced.

[0041] When attaching joist 13 to joist 12 having reinforcing plate 36, as shown in FIG. 10 , insertion portion 33 of end member 25 is inserted into a position adjacent to reinforcing plate 36 between two lip portions 22. That is, end member 25 according to this embodiment has two insertion portions 33 provided in the width direction of joist body 24, and reinforcing plate 36 is inserted between these two insertion portions 33, thereby inserting each insertion portion 33 into a position adjacent to reinforcing plate 36 between two lip portions 22. By attaching end member 25 to joist 12 in this manner, second extension portion 33b of insertion portion 33 engages with hanging portion 22b near reinforcing plate 36. Therefore, even if joist 13 is pushed upward by wind pressure, for example, and second extension portion 33b of insertion portion 33 pushes hanging portion 22b upward, bending of hanging portion 22b and disengagement from second extension portion 33b can be reliably prevented, thereby making joist 13 even more resistant to detachment.

[0042] (Second embodiment) The end member of a joist for suspended scaffolding according to the present invention can be configured as shown in Figures 11(A) and (B) to 19. In these figures, members that are the same as or equivalent to those explained in Figures 1 to 8 are given the same reference numerals, and detailed explanations will be omitted as appropriate. Figure 11(A) is a perspective view showing the joist body in an extended state, and Figure 11(B) is a perspective view showing the joist body in a contracted state. The end member 25 of the joist 41 shown in Figures 11(A) and (B) has a larger dimension in the width direction of the joist body 24 than the end member 25 of the first embodiment, and is arranged at the end of the joist body 24 so as to be rotatable about an axis member 42 whose axis is in the up-down direction. The joist body 24 of the joist 41 according to this embodiment is formed using an outer tube 43 made of a square pipe and an inner tube 44 also made of a square pipe. One end of the inner tube 44 is inserted into the outer tube 43, and the other end is movably fitted to the outer tube 43 with the outer tube 43 protruding outside. Pulling the inner tube 44 out of the outer tube 43 lengthens the overall length of the joist body 24 as shown in Figure 11(A), and inserting the inner tube 44 into the outer tube 43 shortens the overall length of the joist body 24 as shown in Figure 11(B).

[0043] In this embodiment, the joist 41 has, for each end member 25 arranged at both ends of the joist main body 24, a connecting structure 47 consisting of a movable bracket 45 on the end member 25 side, a fixed bracket 46 on the joist main body 24 side, and an axial member 42 that passes through these movable brackets 45 and fixed brackets 46 in the vertical direction, as shown in Figures 12 and 15. As shown in Figures 14 and 15, the movable bracket 45 has a base plate 45a that is parallel to the fixing portion 31 of the end member 25, and a pair of connecting pieces 45b, 45c that extend horizontally from both vertical ends of the base plate 45a toward the fixed bracket 46. The movable bracket 45 is formed integrally with the end member 25 by welding the base plate 45a to the fixing portion 31 of the end member 25. In this embodiment, the fixing portion 31 of the end member 25 is formed in a shape that extends downward at a right angle from the mounting portion 32. The pair of connecting pieces 45b, 45c are formed with first and second through holes 48, 49, through which the shaft member 42 is inserted. A nut member 50, into which the shaft member 42 is screwed, is welded to the lower connecting piece 45c.

[0044] As shown in Figures 16 and 17, the fixed bracket 46 is formed using a channel member that opens downward. The portion of the channel member that opens downward has a lip portion 51 that extends horizontally. A spacer 52 made of a metal plate is welded to the underside of the lip portion 51. A third through-hole 53 is formed in the spacer 52 to allow the shaft member 42 to pass through.

[0045] Furthermore, a fourth through-hole 54, through which the shaft member 42 is inserted, and a notch 55 are formed at the upper end of the fixed bracket 46. The movable bracket 45 and the fixed bracket 46 are connected together by inserting the fixed bracket 46 between a pair of connecting pieces 45b, 45c of the movable bracket 45 and passing the shaft member 42 through the through-holes (first to fourth through-holes 48, 49, 53, 54) of these components. The shaft member 42 is formed by a bolt and is passed through the first through-hole 48 of the upper connecting piece 45b, the fourth through-hole 54 of the fixed bracket 46, the space between the lip portions 51, the third through-hole 53 of the spacer 52, and the second through-hole 49 of the lower connecting piece 45c in this order, and is screwed into a nut member 50 welded to the lower connecting piece 45c of the movable bracket 45.

[0046] The notch 55 formed at the upper end of the fixed bracket 46 is formed on the opposite side of the end member 25 of the fixed bracket 46, as shown in Figure 16, and is formed in a shape that leaves only the two side walls 46a, 46b and the lip portion 51 of the fixed bracket 46. 14, a cylindrical body 56 welded to the tip of the outer cylinder 43 is inserted between the two side walls 46a, 46b of the fixed bracket 46 provided between the outer cylinder 43 and the end member 25. The cylindrical body 56 has the same outer shape as the inner cylinder 44, and is inserted between the two side walls 46a, 46b of the fixed bracket 46 and welded to the fixed bracket 46 while being placed on the lip portion 51.

[0047] As shown in Fig. 15, a fixed bracket 46 is also arranged between the inner tube 44 and end member 25 shown in Fig. 11, and the inner tube 44 is inserted between the two side walls 46a, 46b of this fixed bracket 46, as shown in Fig. 15. The inner tube 44 is inserted between the two side walls 46a, 46b and welded to the fixed bracket 46 while being placed on the lip portion 51. Therefore, even though one end of the joist main body 24 is formed by the outer tube 43 and the other end is formed by the inner tube 44, the end members 25 can be rotatably attached to both ends of the joist main body 24 using a single type of movable bracket 45 and fixed bracket 46.

[0048] 14 and 15, the movable bracket 45 and fixed bracket 46 according to this embodiment are configured so that, when the cylindrical body 56 or the inner cylinder 44 is placed on the lip portion 51 of the fixed bracket 46, the upper connecting piece 45b of the movable bracket 45 is positioned below the upper wall 56a of the cylindrical body 56 or the upper wall 44a of the inner cylinder 44. By adopting this configuration, when the movable bracket 45 rotates relative to the fixed bracket 46 about the shaft member 42, as shown in FIG. 13, part of the upper connecting piece 45b of the movable bracket 45 enters the interior of the cylindrical body 56 or the inner cylinder 44, ensuring a wide range of movement.

[0049] As shown in Figure 13, the movable bracket 45 in this embodiment can rotate relative to the fixed bracket 46 until the upper connecting piece 45b abuts the cylindrical body 56 or the inner cylinder 44. From the initial position where the end member 25 is connected to the joist 12 extending in a direction perpendicular to the longitudinal direction of the joist body 24, the movable bracket 45 can rotate clockwise as viewed from above by an angle θ1, and can also rotate counterclockwise as viewed from above by an angle θ2 from the initial position. The angle θ1 + the angle θ2 is approximately 120 degrees. By limiting the rotation angle of the movable bracket 45 to less than 180 degrees in this way, the insertion portion 33 of the end member 25 can be easily inserted into the joist 12.

[0050] The overall length of the joist body 24 in this embodiment can be changed by moving the inner tube 44 relative to the outer tube 43 in a direction into the outer tube 43 or in a direction out of the outer tube 43. In other words, the length of the joist body 24 is extendable. As shown in Figure 17, the outer cylinder 43 has a slit 61 extending from one end to the other, and a stopper 62 that crosses the slit 61 at the end 43a from which the inner cylinder 44 protrudes. The slit 61 is formed in the bottom wall 63 of the outer cylinder 43. The outer cylinder 43 with this slit 61 formed therein constitutes a so-called channel member with a lip. The stopper 62 is formed by bending a metal plate into a predetermined shape, and is welded to the bottom wall 63 of the outer cylinder 43 in a state where it straddles and crosses the slit 61.

[0051] The inner cylinder 44 has a protrusion 64 that is inserted into the slit 61 of the outer cylinder 43. The protrusion 64 in this embodiment is composed of a bolt 65, a nut 66, etc., as shown in FIG. 18 . The nut 66 is positioned coaxially with a fifth through-hole 67 formed in the inner cylinder 44 and is welded to the outer surface of the inner cylinder 44. The bolt 65 is threadedly attached to the nut 66 while passing through a spring washer 68 and a plain washer 69. The tip of the bolt 65 is inserted into the fifth through-hole 67. The stopper 62 of the outer cylinder 43 crosses the movement path of the protrusion 64 when the protrusion 64 moves together with the inner cylinder 44 relative to the outer cylinder 43.

[0052] In this way, the outer tube 43 is provided with a slit 61 and a stopper 62, and the protrusion 64 of the inner tube 44 is inserted into the slit 61, so that as the inner tube 44 moves relative to the outer tube 43 in the direction of coming out of the outer tube 43, the protrusion 64 hits the stopper 62 before the inner tube 44 comes off the outer tube 43, and further movement of the inner tube 44 is restricted. The position in the longitudinal direction of the inner tube 44 at which the protrusion 64 is attached is a predetermined distance away from one end of the inner tube 44 housed in the outer tube 43. This distance is such that the joist body 24 has sufficient strength against a bending load applied thereto, even when the joist body 24 is stretched until the protrusion 64 hits the stopper 62.

[0053] As shown in Figures 17 and 18, the outer tube 43 is provided with a locking mechanism 71 at or near the end 43a from which the inner tube 44 protrudes. The locking mechanism 71 is composed of a sixth through-hole 72 that connects the inside and outside of the outer tube 43, a nut member 74 serving as a screw seat having a threaded hole 73 that opens toward the sixth through-hole 72, and a screw member 75 that threadably engages with the nut member 74, has its tip inserted through the sixth through-hole 72, and faces the inner tube 44. The nut member 74 is welded to a bracket 77 that protrudes from a side wall 76 of the outer tube 43, and is disposed a predetermined distance from the side wall 76 of the outer tube 43. The screw member 75 is a wing bolt. A retaining pin 78 is fixed to the screw member 75 distal to the nut member 74 in a manner that crosses and protrudes from it.

[0054] In this locking mechanism 71, by tightening the screw member 75 into the nut member 74 and pressing the tip of the screw member 75 against the inner tube 44 through the sixth through-hole 72, the inner tube 44 cannot move relative to the outer tube 43. Therefore, by restricting the movement of the inner tube 44 with the locking mechanism 71 while the joist body 24 is adjusted to a predetermined length, the joist body 24 can be maintained at the predetermined length.

[0055] The end member 25 of the joist 41 according to this embodiment is arranged at the end of the joist body 24 so as to be rotatable about an axis member 42 whose axis is in the vertical direction, and therefore can be tilted about the axis member 42 relative to the joist body 24, as shown in Figure 19. Therefore, the joist 41 having this end member 25 can be installed in a state inclined relative to the joists 12. The two joists 12 shown in Figure 19 are arranged at an interval that allows the joists 13 shown in the first embodiment, i.e., joists 13 perpendicular to the joists 12, to be attached.

[0056] The length of the joist body 24 used in the joist 41 according to this embodiment is extendable. Therefore, the joist 41 according to this embodiment can be installed in an inclined state between two joists 12 connected by a joist 13 that is perpendicular to the joists 12. Of the two joists 12 shown in Figure 19, the joist 12 located on the lower side in Figure 19 protrudes further to the left in Figure 19 than the upper joist 12. By having the lower joist 12 protrude more than the upper joist 12 in this way, the floor panel 11 can be brought as close as possible to, for example, an obstacle 81 located to the side of the suspended scaffolding 1.

[0057] The obstacle 81 is, for example, a sloping wall of a building or a bridge pier. This obstacle 81 has a wall surface 81a that is sloping relative to the longitudinal direction of the joists 12. In order to position the floor panel 11 as close as possible to this wall surface 81a, a joist 41 is installed in a sloping state in a position adjacent to the obstacle 81 and is aligned along the obstacle 81. In addition, between the joist 41 adjacent to the obstacle 81 and the joist 13 that is perpendicular to the joists 12, multiple joists 41 are arranged with different installation angles and overall lengths.

[0058] The installation angle of the joists 41 gradually approaches the installation angle of the joists 13, which is perpendicular to the joists 12, as they move away from the obstacle 81. In addition, the overall length of the joists 41 gradually shortens as they move away from the obstacle 81. By installing multiple joists 41 at different installation angles and lengths in this way, it is possible to arrange floor panels 11 over the entire area of ​​the floor portion 4, even though the ends of the floor portion 4 are inclined in a direction perpendicular to the joists 12, and it is possible to distribute the load applied to the floor panels 11 to the multiple joists 41.

[0059] When a suspended scaffolding 1 is constructed near an obstacle 81 as described above using only joists 13 extending at right angles to the joists 12, a space S is formed between the inclined wall surface 81a of the obstacle 81 and the floor portion 4, as shown in Figure 20. The space S shown in Figure 20 is a triangular space with one side corresponding to the total width of the multiple floor panels 11. In other words, by adopting the second embodiment, it is possible to solve the problem of not being able to construct scaffolding by bringing the floor portion 4 close to the wall surface 81a of the obstacle 81 that is inclined relative to the joists 12.

[0060] The joist body 24 according to this embodiment is configured by fitting an inner tube 44 made of a square pipe into an outer tube 43 made of a square pipe so that one end of the inner tube 44 is inserted into the outer tube 43 and the other end protrudes outside the outer tube 43. The outer tube 43 has a slit 61 extending from one end to the other, and a stopper 62 that crosses the slit 61 at the end 43a from which the inner tube 44 protrudes. The inner tube 44 has a protrusion 64 that fits into the slit 61 of the outer tube 43. As a result, the protrusion 64 moves together with the inner tube 44 relative to the outer tube 43 and hits the stopper 62, thereby reliably preventing the inner tube 44 from accidentally coming off the outer tube 43.

[0061] The joist body 24 according to this embodiment is equipped with a locking mechanism 71 provided at or near the end 43a of the outer tube 43 from which the inner tube 44 projects. This locking mechanism 71 is composed of a sixth through-hole 72 that communicates between the inside and outside of the outer tube 43, a nut member 74 (screw seat) having a screw hole 73 that opens toward the sixth through-hole 72, and a screw member 75 that threads onto the nut member 74, has its tip inserted into the sixth through-hole 72, and faces the inner tube 44. Therefore, by tightening the screw member 75, movement of the inner tube 44 relative to the outer tube 43 can be restricted, thereby making it possible to obtain a joist that is capable of maintaining a constant length despite being extendable.

[0062] The joist 41 shown in FIG. 19 is used in a state where it is inclined relative to the joists 12. However, the joist 41 according to this embodiment can also be used in a state where it is perpendicular to the joists 12. In this case, by forming all of the joists 41 to be the same length and bridging these joists 41 of the same length across two joists 12 at right angles, it becomes possible to set the distance between the joists 12 as desired while maintaining the two joists 12 parallel to each other. This means that the same joist 41 can be used in common at multiple construction sites where the distance between the two joists 12 is different.

[0063] 11 to 19, the joist 12 having the reinforcing plate 36 shown in Fig. 9 and Fig. 10 can also be used. Even in this case, with the reinforcing plate 36 inserted between two insertion portions 33, these insertion portions 33 may be inserted at positions adjacent to the reinforcing plate 36 between the lip portions 22 of the joist 12. In the second embodiment, an example has been shown in which an end member 25 having a second extension 33b provided on the insertion portion 33 is used. However, when adopting a configuration in which the end member 25 is disposed at the end of the joist main body 24 so as to be rotatable about an axis member 42 whose axial direction is the up-down direction, or a configuration in which the end member 25 is attached to the end of the expandable joist main body 24, an end member that does not have the second extension 33b can be used. [Industrial Applicability]

[0064] The present invention can be used as an end member of a joist for a suspended scaffold, which is used to detachably attach a joist on which a floor panel is placed to a joist. [Explanation of symbols]

[0065] 1...suspended scaffolding, 3...suspending member, 4...floor portion, 12...joist, 13, 41...joist, 24...joist body, 21...opening, 22...lip portion, 22b...hanging portion, 25...end member, 33...insertion portion, 33a...first extension portion, 33b...second extension portion, 34...projection portion, 36...reinforcing plate which is a reinforcing member, 42...shaft member, 43...outer tube, 44...inner tube, 61...slit, 62...stopper, 64...convex body, 71...locking mechanism, 72...sixth through hole which is a through hole, 73...screw hole, 74...nut member which is a screw seat, 75...screw member.

Claims

1. An end member that is arranged at the end of a joist body of a joist that constitutes, together with a joist, the floor portion of a suspended scaffolding suspended by a suspension member, and has an insertion portion that is inserted into the joist, The joist is a channel member with a pair of lips that are provided opposite each other at an opening that opens upward, and each tip of the lip is a hanging part, and the insertion part is inserted between the two hanging parts at the tips of the pair of lips, An end member of a joist for a suspended scaffolding, characterized in that the insertion portion has a first extension portion extending downward parallel or approximately parallel to the hanging portion, and a second extension portion extending diagonally downward from the lower end of the first extension portion to the underside of one of the hanging portions.

2. 2. The end member of a joist for a suspended scaffolding according to claim 1, wherein the insertion portion is provided in a plurality of pieces in the width direction of the joist body, and all of the insertion portions have the first extension portion and the second extension portion.

3. 3. The end member of a joist for a suspended scaffolding according to claim 2, wherein the number of insertion portions is two, and a protruding piece portion is provided between these insertion portions that protrudes upward and abuts against the end surface of a floor panel placed on the floor portion to prevent the floor panel from slipping.

4. The end member of a joist for a suspended scaffolding according to any one of claims 1 to 3, characterized in that it is fixed to the end of the joist body.

5. In the end member of a joist for a suspended scaffolding according to any one of claims 1 to 3, the end member of the joist body is arranged at the end of the joist body so as to be freely rotatable around an axis member whose axial direction is in the vertical direction. End member of a joist for a suspended scaffolding.

6. In the end member of a joist for a suspended scaffolding according to any one of claims 1 to 5, the length of the joist body is extendable.

7. In the end member of the suspended scaffolding joist according to claim 6, the joist body is configured by inserting an inner tube made of a square pipe into an outer tube made of a square pipe at one end and movably fitting the inner tube with the other end protruding out of the outer tube, the outer cylinder has a slit extending from one end to the other end, and a stopper that crosses the slit at an end from which the inner cylinder projects, The inner tube has a protrusion that fits into the slit, and is an end member of a joist for a suspended scaffolding.

8. The end member of the suspended scaffolding joist according to claim 7, further comprising a locking mechanism provided at the end of the outer tube from which the inner tube protrudes or in the vicinity of the end, The locking mechanism is characterized in that it is composed of a through hole connecting the inside and outside of the outer tube, a screw seat having a screw hole opening toward the through hole, and a screw member that screws into the screw seat and has its tip inserted into the through hole and faces the inner tube.

9. In the end member of the suspended scaffolding joist according to any one of claims 1 to 8, the joist is provided with a reinforcing member that connects the pair of lip portions together, The number of the insertion portions is at least two, arranged in the width direction of the joist body, and the two insertion portions are inserted between the pair of lip portions at positions adjacent to the reinforcing member.

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