Frame member for scaffold structure, construction method of scaffold structure, and removal method of scaffold structure

Abstract

To provide a frame member for a scaffold structure, a construction method of the scaffold structure, and a removal method of the scaffold structure, capable of easily and safely performing work for connecting an extension scaffold to an existing scaffold having a connector arranged in a construction object.SOLUTION: A frame member (60) for a scaffold structure formed by connecting an additional scaffold (3) to an existing scaffold (2) provided on a construction object through a connecting tool (5) comprises a frame member body (6) having a base end rotatably supported by the connecting tool (5) and a handrail (8) integrally attached to the frame member body (6), wherein the frame member body (6) is rotatably supported from a folding position along the existing scaffold (2) to a developing position protruding from the existing scaffold (2).SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a frame member for a scaffolding structure constructed by connecting additional scaffolding to an existing scaffolding installed on a construction object such as a highway bridge or the ceiling of a gymnasium, a construction method for the scaffolding structure, and a removal method for the scaffolding structure. [Background technology]

[0002] In recent years, for example, when constructing structures such as bridges, or when constructing buildings such as high-rise buildings, or when performing maintenance work on these structures, scaffolding is suspended below the construction object, and various operations are performed on this scaffolding. As a technology for constructing such scaffolding, a work platform support system is known that includes a first hub connected to a second hub via a first joist, a third hub connected to a fourth hub via the second joist, a third joist connecting the third hub and the first hub, and a fourth joist connecting the second hub and the fourth hub, and is configured so that the second, third, and fourth joists and the third and fourth hubs can articulate relative to the first and second hubs and the first joist from a closed position to an extended position to receive the work platform (see, for example, Patent Document 1).

[0003] Furthermore, by arranging a plurality of scaffolding frames, each of which has one longitudinal end supported so as to be rotatable horizontally, in parallel with a horizontal gap, and by arranging a floor panel so as to span the upper end side of each scaffolding frame, a hanging scaffold that is suspended from a structure is provided with spacing members that are arranged so as to span the lower end sides of the scaffolding frames that are arranged in parallel with a horizontal gap, and that engage both ends with the lower end sides of each scaffolding frame to hold the scaffolding frames at a gap, and the longitudinal end of another new scaffolding frame can be freely rotated horizontally to the longitudinal end of the scaffolding frame. a connecting portion that can be connected to the scaffolding frame, the connecting portion having a first connecting portion provided at one longitudinal end of the scaffolding frame, a second connecting portion provided at the other longitudinal end of the scaffolding frame and connected to the first connecting portion so as to be detachable in the vertical direction and rotatable in the horizontal direction, a base plate to which the lower ends of one of the first and second connecting portions and the lower end side of the end of the scaffolding frame are fixed, and a connecting plate that connects the upper ends of the first and second connecting portions that are connected to each other and the upper end side of the end of the scaffolding frame, wherein the first and second connecting portions are formed by cylindrical members that are inserted one inside the other (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5820848 [Patent Document 2] Patent No. 6957723 Summary of the Invention [Problem to be solved by the invention]

[0005] The work platform support system disclosed in Patent Document 1 is configured to connect an additional scaffolding (work platform) consisting of four joists connected by four hubs to an existing scaffolding installed below a construction object, and then deploy the additional scaffolding structure to its usage position. This configuration allows tasks such as connecting the additional scaffolding to the existing scaffolding to be performed in mid-air. However, because the additional platform connected to the existing scaffolding has four joists and four hubs and is extremely heavy, a large load is inevitably applied to the base ends of the joists when deploying the additional platform from its folded position to its usage position. Therefore, the hubs supporting the base ends of the joists must be large and strong. Furthermore, because the work of constructing a scaffolding structure by connecting an additional scaffolding to an existing scaffolding is dangerous, it is desirable to ensure the safety of workers.

[0006] Furthermore, the suspended scaffolding disclosed in Patent Document 2 is configured such that a first connecting part consisting of a cylindrical member extending in the vertical direction and provided on one scaffolding frame is fitted onto a second connecting part consisting of a cylindrical member extending in the vertical direction and provided on another new scaffolding frame, and the second connecting part is pivotally supported around the axis of the first connecting part, thereby enabling the new scaffolding frame to be displaced from a folded position to an unfolded position. In this configuration, the inner diameter of the first connecting part must be larger than the outer diameter of the second connecting part to rotatably connect the two, which makes it easy for the connecting part of the two scaffolding frames to wobble, making it difficult to maintain a stable connection between the two scaffolding frames and to sufficiently ensure the safety of workers.

[0007] The present invention has been made in consideration of the above points, and aims to provide a frame member for a scaffolding structure, a construction method for a scaffolding structure, and a removal method for a scaffolding structure that enable tasks such as connecting an additional scaffolding having a frame member and floor board material to an existing scaffolding having connectors attached to a construction object to be easily and safely performed. [Means for solving the problem]

[0008] A frame member for a scaffolding structure according to one example of the present invention is a frame member for a scaffolding structure that is connected to existing scaffolding installed on a construction object via a connector, and comprises a frame member main body whose base end is rotatably supported by the connector, and a handrail that is integrally attached to the frame member main body, and the frame member main body is supported so that it can be rotatably displaced from a folded position along the existing scaffolding to an expanded position protruding from the existing scaffolding. [Effects of the Invention]

[0009] As described above, the frame member for scaffolding structures according to the present invention comprises a frame member main body whose base end is rotatably supported by a connector, and a handrail integrally attached to the frame member main body.The frame member for scaffolding structures is configured to be transported into a folded position along the existing scaffolding, and the frame member main body is rotated to displace it into an extended position protruding from the existing scaffolding.Therefore, while the handrail protects the worker, it is possible to easily and safely perform tasks such as transporting the frame member, rotating and displacing the frame member main body from the folded position to the extended position, and installing floorboard materials on the additional scaffolding. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view showing the overall configuration of a scaffolding structure equipped with a frame member according to the present invention; [Figure 2] A perspective view showing the configuration of the existing scaffolding [Figure 3] Front view showing the suspension state of the existing scaffolding and the additional scaffolding [Figure 4] FIG. 1 is a perspective view showing a specific configuration of a connector; [Figure 5] FIG. 10 is a front view showing a state in which an end of the frame member is temporarily placed on the temporary placement portion. [Figure 6A] A front view showing a state in which the end of the frame member is held by the holding portion. [Figure 6B] A front view showing the specific configuration of the cross pin [Figure 7] FIG. 10 is a plan view showing a state in which the end of the frame member is temporarily placed on the temporary placement portion. [Figure 8] FIG. 1 is a perspective view showing a frame member body constituting a frame member according to the present invention; [Figure 9] FIG. 1 is a perspective view showing an embodiment of a frame member according to the present invention; [Figure 10] A process diagram showing how to construct a scaffolding structure [Figure 11] 10 is a perspective view showing a process of unfolding one of the frame members. [Figure 12] FIG. 10 is a perspective view showing a state in which one of the frame members is expanded. [Figure 13] FIG. 10 is a perspective view showing the process of unfolding the other frame member. [Figure 14] FIG. 10 is a perspective view showing a state in which the pair of frame members are unfolded. [Figure 15] FIG. 10 is a perspective view showing a state in which an intermediate support frame is suspended between opposing frame members; [Figure 16] A perspective view showing the process of installing floorboards [Figure 17] A perspective view showing the process of installing floorboards [Figure 18] A perspective view showing the process of installing floorboards [Figure 19] A process diagram showing how the scaffolding structure will be removed DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals are used to denote the same components, and the description thereof will be omitted.

[0012] 1 to 9 show specific examples of scaffolding structures equipped with frame members according to an embodiment of the present invention. The scaffolding structure includes an existing scaffolding 2 installed on a construction object 1 such as a bridge, an additional scaffolding 3 connected to the existing scaffolding 2, and a suspending device 4 that supports the existing scaffolding 2 and the additional scaffolding 3 in a suspended state from the construction object 1. In this embodiment, the existing scaffolding 2 and the additional scaffolding 3 have the same configuration, but it is also possible to use an existing structure that has been installed in advance on the construction object 1 as the existing scaffolding.

[0013] As shown in Figures 1 to 3, the existing scaffolding 2 and the additional scaffolding 3 in this embodiment have a plurality of connectors 5 supported in a suspended state from beams 11 etc. of the construction object 1 by hanging devices 4, a plurality of frame member bodies 6 with their ends connected to the connectors 5, floorboard materials 7 installed to cover the space surrounded by the frame member bodies 6, and handrails 8 erected to surround the outer periphery of the existing scaffolding 2 and the additional scaffolding 3.

[0014] As shown in FIG. 3, the suspension device 4 has a beam clamp 41 that holds a beam 11 or the like of the construction object 1, a hoist 42 provided below the beam clamp 41, and a cable 43 made of a chain, wire rope, or the like that is supported by the hoist 42 so that it can be wound up and down, and the cable 43 is configured to support the connecting device 5 so that the height can be adjusted.

[0015] As shown in Figures 4 to 7, the connecting device 5 has a suspended part 50 suspended by cable 43 of the hanging device 4, a disk-shaped upper plate 51 to the upper surface of which the suspended part 50 is fixed by a fixing bolt or the like, a support pillar 52 made of a round pipe or the like extending downward from the lower surface of the center of the upper plate 51, a donut-shaped pressure plate 53 supported on the support pillar 52 so that it can be raised and lowered, a holding part 54 fixed to the lower part of the support pillar 52, a temporary placement part 55 provided at the upper part of the holding part 54, and a reinforcing plate 56 fixed to the lower surface of the holding part 54.

[0016] As shown in Fig. 4, the upper plate 51 of the connector 5 is formed with a plurality of insertion holes 512 for fixing bolts 511 that fix the presser plate 53 to an upper standby position (see Fig. 5), and four nuts 531 onto which the screw shafts of the fixing bolts 511 are threaded are fixed to the upper surface of the presser plate 53. In addition, the outer periphery of the presser plate 53 is provided with insertion holes 532 for first vertical pins 61 that are used to fix the frame member main body 6 to the holding portion 54 so that it cannot be displaced relative to the holding portion 54.

[0017] The holding portion 54 of the connector 5 has a bottom wall portion 541 that supports the lower end of the frame member main body 6, and a pair of left and right side wall portions 542, 542 (see FIGS. 4 and 5) that stand upward from the side ends of the bottom wall portion 541. As shown in FIG. 6A, at least the lower portion of the frame member main body 6 is held in a state where it is inserted between the both side wall portions 542, 542 of the holding portion 54. Furthermore, an insertion hole 543 into which the first vertical pin 61 is inserted is formed in the bottom wall portion 541 of the holding portion 54, and an insertion hole 544 into which a second vertical pin 62 for fixing the frame member is inserted is formed at a position adjacent thereto (see FIG. 7).

[0018] As shown in FIGS. 4 and 5, a pair of insertion holes 545, 545 are provided in the side wall portion 542 of the holding portion 54, into which a cross pin 63 for fixing the frame member is inserted. As shown in FIG. 6B, the cross pin 63 has a cross pin main body 632 having a head 631, and a tip portion 634 pivoted to the tip of the cross pin main body 632 via a connecting pin 633. The cross pin main body 632 inserted into the insertion hole 545 of the holding portion 54 is installed so as to penetrate a pipe-shaped member 68 provided inside the frame member main body 6, as shown in FIG. 6A. In addition, the tip portion 634 of the cross pin 63 is bent downward with the connecting pin 633 as a fulcrum, so that the end of the frame member main body 6 is fixed within the holding portion 54 in a state where it cannot be relatively displaced.

[0019] 4 and 5, the temporary placement portion 55 of the connector 5 is made up of a pair of flanges protruding outward from the upper end of the side wall portion 542. As shown in FIGS. 5 and 7, the base end of the frame member main body 6B1 in the folded position is placed on the temporary placement portion 55 and is rotatably supported by the support shaft 64.

[0020] In this embodiment, as shown in Fig. 7, the holding parts 54 and temporary placement parts 55 of the connector 5 are arranged at four horizontal positions at 90-degree angles on the connector 5. This allows the ends of each frame member main body 6 constituting the existing scaffolding 2 and the additional scaffolding 3 to be placed on the temporary placement parts 55. In addition, by inserting the ends of each frame member main body 6 into the holding parts 54, the four frame member main bodies 6 can be arranged in a cross shape in a plan view.

[0021] 8 and 9, the frame member main body 6 is made of, for example, a long square pipe-like member having a vertically elongated cross section, and on both the upper and lower surfaces of its end, there are formed an insertion hole 65 through which the first vertical pin 61 is inserted, and an insertion hole 66 through which either the second vertical pin 62 or the support shaft 64 is selectively inserted. In addition, on both the left and right side surfaces of the end of the frame member main body 6, there are formed a pair of insertion holes 67, 67 through which the horizontal pin 63 is inserted, respectively. Furthermore, a pipe-like member 68 that serves as an insertion guide for the horizontal pin 63 is provided inside the frame member main body 6 (see FIG. 6A).

[0022] A plurality of screw holes 69 are provided at regular intervals on the upper surface of the frame member main body 6, and serve as attachment points for restraint plates 71 (see Figure 1) that restrain the ends of the floorboard material 7 from above. The screw holes 69 are formed by fastening nuts (not shown) below openings formed on the upper surface of the frame member main body 6, and serve as attachment points for hooks 45 and 46 (described later), as fixed points for support posts 81 that constitute the handrail 8, and as operating holes into which the tips of the operating rods 47 are inserted.

[0023] A support bracket 83 having a pair of upper and lower insertion holes 84 into which the lower ends of the posts 81 constituting the handrail 8 are inserted is provided on the side wall of the frame member main body 6. The handrail 8 has a fence member 80 extending along the length of the frame member main body 6 and a post 81 that supports the fence member 80, with a support plate 82 extending horizontally provided below the post 81. Then, with the lower ends of the posts 81 inserted into the insertion holes 84 of the support bracket 83, the support plate 82 of the post 81 is screwed into the screw holes 69 of the frame member main body 6, for example, to form the frame member 60 for a scaffolding structure according to the present invention, in which the frame member main body 6 and the handrail 8 are integrated.

[0024] Furthermore, a plurality of intermediate holding portions 91 each having a U-shaped cross section are provided at regular intervals on the side surface of the frame member main body 6. As shown in Fig. 15, the intermediate holding portions 91 function as locking portions for locking both ends of the intermediate support frame 9 made of a square pipe-shaped member or the like that is hung across the frame member main bodies 6B1, 6B2 that are deployed to face each other.

[0025] 10 shows a construction method for a scaffolding structure including a frame member 60 according to the present invention. The construction method for the scaffolding structure includes a connecting step K1 of connecting a frame member main body 6 of an additional scaffolding 3 to an existing scaffolding 2 set up on a construction object 1 via a connector 5, and an installation step K2 of installing floorboard materials 7 so as to cover a space surrounded by the frame member main body 6 constituting the additional scaffolding 3.

[0026] The connecting process K1 includes a delivery process K11 in which the frame members of the additional scaffolding 3 having the frame member bodies 6B1, 6B2 and the handrails 8 are delivered to a folding position (see Figures 11 and 13) along the frame member body 6A located at the front edge of the existing scaffolding 2, and a support process K12 in which the base ends of the frame member bodies 6B1, 6B2 delivered in the delivery process K11 are rotatably supported by the support shaft 64 while being placed on the temporary placement section 55 of the connecting device 5.

[0027] The installation process K2 includes a hanging process K21 in which the frame member main bodies 6B1, 6B2 are hung by the extension members 44 (see Figures 11 and 13); an unfolding process K22 in which the frame member main bodies 6B1, 6B2 in the folded position described above are rotated and displaced to an unfolded position (see Figures 12 and 14) in which they are protruded from the existing scaffolding 2; a fixing process K23 in which the base ends of the frame member main bodies 6B1, 6B2 are inserted and fixed into the holding portion 54 of the connecting device 5 provided below the temporary placement portion 55; an arrangement process K24 in which the intermediate support frame 9 is arranged so as to span the frame member main bodies 6B1, 6B2 installed opposite each other; and an attachment process K25 in which the floor plate material 7 is placed on the intermediate support frame 9 and attached to it by a restraint plate 71.

[0028] Specifically, in the hanging process K21, as shown in Fig. 11, one end of the overhang member 44 is fixed to a hook 45 screwed to the upper surface of the frame member main body 6 constituting the existing scaffolding 2, and the middle portion of the overhang member 44 is hooked to the hoist 42 of the hanging tool 4, and then the other end of the overhang member 44 is fixed to a hook 46 screwed to the upper surface of the frame member main body 6B1 constituting one side of the additional scaffolding 3. In this manner, with the tip portion of the frame member main body 6B1 suspended from the longitudinal center by the overhang member 44, in the unfolding process K22, the frame member for the additional scaffolding 3 having the frame member main body 6B1 and the handrail 8 can be smoothly rotated and displaced from the folded position along the existing scaffolding 2 to the unfolded position shown in Fig. 12.

[0029] In the unfolding process K22, as shown in Figure 11, after inserting the tip of the operating rod 47 into the operating hole consisting of the screw hole 69 of the frame member main body 6B1, a worker on the existing scaffolding 2 can safely rotate and displace the frame member main body 6B1 to the unfolded position shown in Figure 12 by using the operating rod 47 to push the frame member main body 6B1.

[0030] As described above, the frame member for the additional scaffolding 3, which has the frame member main body 6B1 and the handrail 8 that constitute one side edge of the additional scaffolding 3, is rotated and displaced to the deployed position, and the base end of the frame member main body 6B1 is lowered from the temporary placement position shown in Fig. 5 to the holding position shown in Fig. 6A, and then in a fixing step K23, the fixed state of the presser plate 53 by the fixing bolt 511 is released. Then, with the presser plate 53 slidably displaced from the upper standby position to the lower fixed position and in contact with the upper surface of the frame member main body 6B1, the first vertical pin 61 is inserted sequentially into the insertion hole 521 of the presser plate 53, the insertion hole 65 of the frame member main body 6B1, and the insertion hole 543 formed in the bottom wall portion 541 of the holding portion 54, thereby installing the first vertical pin 61 so as to penetrate through these.

[0031] 9, after the support shaft 64 is pulled out from the frame member main body 6B1, the second vertical pin 62 is inserted sequentially into the insertion hole 66 of the frame member main body 6B1 and the insertion hole 544 of the holding portion 54, thereby installing the second vertical pin 62 so as to penetrate these (see FIG. 6A). Furthermore, the horizontal pin 63 is inserted sequentially into the insertion hole 545 formed in the side wall portion 542 of the holding portion 54, the insertion hole 67 provided in the frame member main body 6B1, and the pipe-shaped member 68, thereby installing the horizontal pin 63 so as to penetrate these. As a result, the base end of the frame member main body 6B1 is fixed so as not to be displaced relative to the holding portion 54 of the connector 5. Note that in this embodiment, when the base end of the frame member main body 6B1 is fixed to the holding portion 54, the support shaft 64 is pulled out and replaced with the shorter second vertical pin 62. However, the support shaft 64 can also be used as is as the first vertical pin that fixes the base end of the frame member main body 6B1 to the holding portion 54.

[0032] 13, a carrying-in process K11 is performed in which a frame member for a scaffolding structure having a frame member main body 6B2 and a handrail 8 that constitute the other side edge of the additional scaffolding 3 is carried into a folded position along the frame member main body 6A, and a supporting process K12 is performed in which the base end of the frame member main body 6B2 is placed on the temporary placement portion 55 of the connector 5 and rotatably supported by the support shaft 64. In addition, by sequentially performing a hanging process K21 in which the frame member main body 6B1 of the additional scaffolding 3 is suspended by the protruding member 44 that protrudes from the hanging tool 4, an unfolding process K22 in which the frame member main body 6B2 is rotatably displaced to the unfolded position, and a fixing process K23 in which the base end of the frame member main body 6B2 is inserted into the holding portion 54 of the connector 5 and fixed, the frame member main bodies 6B1 and 6B2 are fixed in a state in which they face each other with a certain interval between them, as shown in FIG.

[0033] Next, in the arrangement step K24, as shown in Fig. 15, the intermediate support frame 9 is arranged so as to span the intermediate holding parts 91 of the opposing frame member main bodies 6B1, 6B2, and then the floor plate material 7 is placed on the intermediate support frame 9 as shown in Fig. 16. Also, in the installation step K25, as shown in Fig. 17, the floor plate material 7 on the intermediate support frame 9 is pulled a certain distance toward the existing scaffolding 2, and the left and right ends of the frame member main body 6B3 that constitutes the front edge of the additional scaffolding 3 are connected to the tip ends of the frame member main bodies 6B1, 6B2 via connectors 5, 5 provided on the left and right ends of the frame member main body 6B3.

[0034] 18, in the installation step K25, the floor plate material 7 is slid toward the front side of the existing scaffolding 2 until its tip abuts against the inside surface of the frame member main body 6B3, and the end of the floor plate material 7 is pressed down from above by the restraining plate 71 to restrain it, and the connectors 5 provided on both the left and right ends of the frame member main body 6B3 are supported by the suspending devices 4 on the construction object 1. In this way, a scaffolding structure can be constructed in which the additional scaffolding 3 is connected to the existing scaffolding 2, as shown in FIG.

[0035] As described above, by using the frame member 60 for a scaffolding structure according to the present invention, it is possible to easily and safely perform tasks such as connecting an additional scaffolding 3 to an existing scaffolding 2 having a connector 5 attached to a construction object 1. That is, as shown in Fig. 9 , the frame member 60 for a scaffolding structure, which includes a frame member main body 6 whose base end is rotatably supported by the connector 5 and a handrail 8 integrally attached to the frame member main body 6, is configured to be carried into a folded position along the existing scaffolding 2 and to rotate the frame member main body 6 to displace it into an extended position protruding from the existing scaffolding 2. Therefore, while the handrail 8 protects the worker, tasks such as carrying the frame member 60 into the folded position, rotating the frame member main body 6 from the folded position to the extended position, arranging the intermediate support frame 9 on the additional scaffolding 3, and attaching the floorboards 7 can be easily and safely performed.

[0036] Furthermore, in the above-described embodiment, the lower ends of the posts 81 that constitute the handrail 8 are configured to be inserted and fixed into the insertion holes 84 of the support brackets 83 provided on the side of the frame member main body 6, which has the advantage that the frame member 60 for the scaffolding structure of the present invention, in which the handrail 8 is integrally attached to the frame member main body 6, can be easily formed.

[0037] In particular, as shown in the above-described embodiment, when the horizontally extending support plate 82 provided on the lower part of the support post 81 is configured to be fixed to a fixed portion consisting of a screw hole or the like provided on the upper surface of the frame member main body 6, the handrail 8 can be firmly attached to the frame member main body 6 by simply inserting the lower end of the support post 81 into the insertion hole 84 of the support bracket 83 and performing a simple task such as screwing the support plate 82 to the upper surface of the frame member main body 6 with a single screw.

[0038] Furthermore, in the above-described embodiment, the connector 5 is provided with the temporary placement section 55 on which the base end of the frame member main body 6 is placed when the frame member main body 6 is in the folded position, and the holding section 54 that holds the base end of the frame member main body 6 below the temporary placement section 55 when the frame member main body 6 is in the unfolded position, and is configured to rotatably support the base end of the frame member main body 6 while it is temporarily placed on the temporary placement section 55. This allows the following operations to be safely performed on the existing scaffolding 2: carrying the frame member main body 6 to the folding position along the existing scaffolding 2 and rotatably supporting the base end on the temporary placement section 55; and rotating the frame member main body 6 from the folded position to the unfolded position and holding the base end in a state where it is easily and accurately positioned on the holding section 54. Moreover, by holding the base end of the frame member main body 6 in the holding section of the connector 5 when it is unfolded at an appropriate angle relative to the existing scaffolding 2, there is an advantage that the existing scaffolding 2 and the additional scaffolding 3 can be firmly connected with a simple configuration and the connected state between them can be stably maintained.

[0039] In the above-described embodiment, as shown in Fig. 7, the connector 5 is used in which the holding parts 54 and temporary placement parts 55 are arranged at four horizontal positions at 90-degree angles, so that the ends of each frame member main body 6 constituting the existing scaffolding 2 and the additional scaffolding 3 are placed on the temporary placement parts 55, and then each frame member main body 6 is rotated and displaced to insert its base end into the holding part 54, thereby arranging the four frame member main bodies 6 in a cross shape. Therefore, the frame member main bodies 6 constituting the existing scaffolding 2 and the additional scaffolding 3 can be connected in both the vertical and horizontal directions.

[0040] For example, as shown in Figures 1 and 17, a connector 5 separate from the connector 5 provided on the existing scaffolding 2 is connected to the tip of the frame member main body 6B1, 6B2 that constitutes the additional scaffolding 3, and the connector 5 is used to perform the expansion process (not shown) in which a new scaffolding is added to the additional scaffolding 3, thereby sequentially connecting multiple additional scaffoldings 3 to the existing scaffolding 2 via the connector 5, thereby allowing the installation range of the scaffolding structure to be expanded as desired.

[0041] In the above-described embodiment, the holding portion 54 of the connecting device 5 is provided with a bottom wall portion 541 that supports the lower end of the frame member main body 6, and a pair of left and right side wall portions 542, 542 that stand upward from the side ends of the bottom wall portion 541, and the base end of the frame member main body 6 is inserted into the holding portion 54 by displacing it downward from the temporary placement portion 55 of the connecting device 5. However, this configuration is not limited to this, and various configurations can be adopted that can rotatably support the base end of the frame member main body 6 on the connecting device 5 and can stably fix the frame member main body 6 in the deployed position.

[0042] As shown in the above-described embodiment, when the base end of the frame member main body 6 is inserted into the holding portion 54, the presser plate 53 is lowered to the fixed position shown in FIG. 6A and the base end of the frame member main body 6 is fixed to the holding portion 54 via the first and second vertical pins 61, 62 and the pair of horizontal pins 63, 63 so as not to be displaced relative to the holding portion 54, there is an advantage that the frame member main body 6 can be stably held in the deployed position with a simple configuration. Note that it is also possible to fix the base end of the frame member main body 6 to the holding portion 54 using fixing bolts instead of the first and second vertical pins 61, 62 and the pair of horizontal pins 63, 63. However, when the first and second vertical pins 61, 62 and the horizontal pins 63, 63, etc. are used as shown in the above-described embodiment, the frame member main body 6 can be easily and stably fixed simply by inserting them into the respective insertion holes. Moreover, the fixed state of the frame member main body 6 to the holding portion 54 can be easily released by pulling out the first and second vertical pins 61, 62 and the horizontal pins 63, 63, etc. from the respective insertion holes.

[0043] Furthermore, in the above-described embodiment, the presser plate 53 of the connector 5 is configured to be displaceable between an upper standby position and a lower fixed position by moving up and down along the support column 52. With this configuration, the base end of the frame member main body 6 can be easily placed on the temporary placement section 55 with the presser plate 53 fixed in the upper standby position shown in Fig. 5. Moreover, by inserting the first vertical pin 61 into the insertion hole 532 to fix the frame member main body 6 with the presser plate 53 slidably displaced to the lower fixed position so that the presser plate 53 abuts against the upper surface of the frame member main body 6, it is possible to effectively prevent the frame member main body 6 from floating up.

[0044] Note that instead of the above-described embodiment in which the tip end portion of frame member main body 6 is suspended by overhanging member 44 extending from suspending tool 4, it is also possible to support frame member main body 6 in a suspended state by, for example, an unillustrated cable or the like hanging down from construction target object 1. However, as shown in FIGS. 11 and 13 , when frame member main bodies 6B1, 6B2 are suspended by overhanging member 44 extending from suspending tool 4, frame member main bodies 6B1, 6B2 can be rotated and displaced from the folded position to the unfolded position while maintaining the inclination angle and overhang length of overhanging member 44 substantially constant. Therefore, without the need for complicated work such as adjusting the overhang length of overhanging member 44, frame member main bodies 6B1, 6B2 can be smoothly rotated and displaced while maintaining frame member main bodies 6B1, 6B2 in a horizontal state.

[0045] 1 and 2, in the above-described embodiment, the existing scaffolding 2 has a frame member main body 6 whose tip is connected to a connector 5, similar to the additional scaffolding 3, and a floor plate material 7 that is installed in the space surrounded by the frame member main body 6, so that mass production can be achieved by standardizing the components of the existing scaffolding 2 and the additional scaffolding 3. This makes it possible to keep the manufacturing costs of the scaffolding structure low.

[0046] In the above-described embodiment, as shown in Fig. 15, a plurality of intermediate holding portions 91 are provided at regular intervals on the side surface of the frame member main body 6, and as shown in Fig. 16, an intermediate support frame 9 made of a square pipe-shaped member or the like is arranged to span the intermediate holding portions 91 of the opposing frame member main bodies 6, 6. With this configuration, the floor plate material 7 can be fixed with the floor plate material 7 placed on the intermediate support frame 9, making the fixing work safe and easy. Moreover, by supporting the floor plate material 7 from below with the intermediate support frame 9, it is possible to effectively prevent the floor plate material 7 from bending when a worker walks on the floor plate material 7, for example.

[0047] In the above-described embodiment, as shown in FIG. 11, the tip of the operating rod 47 is inserted into an operating hole such as a screw hole 69 formed on the top surface of the frame member main body 6, and the operating rod 47 is used to push the frame member main body 6B1, thereby rotating and displacing the frame member main body 6B1 to the unfolded position. However, instead of this configuration, the frame member 60 may be configured so that the worker holds the fence member 80 of the handrail 8 and rotates and displaces the frame member 60, which is in the folded position, to the unfolded position.

[0048] Figure 19 shows a method for removing a scaffolding structure constructed as described above. This method for removing the scaffolding structure involves removing the additional scaffolding 3 in a procedure that is substantially the reverse of the construction method for the scaffolding structure shown in Figure 10, and includes a removal process T1 for removing the floor plate material 7 of the additional scaffolding 3 connected to the existing scaffolding 2 from the fixed portion, and a detachment process T2 for detaching the frame member 60 of the additional scaffolding 3 from the existing scaffolding 2.

[0049] The removal process T1 includes a floor board removal process T11 in which the floor board material 7 of the additional scaffolding 3 fixed by the restraint plate 71 is removed from the fixed portion, and a support frame removal process T12 in which the intermediate support frame 9 of the additional scaffolding 3 is removed from the frame member main bodies 6B1, 6B2.

[0050] The detachment process T2 includes an unlocking process T21 for unlocking the frame member bodies 6B1, 6B2 from the connectors 5 when they are in the deployed position protruding from the existing scaffolding 2, a folding process T22 for rotating and displacing the frame member bodies 6B1, 6B2 of the additional scaffolding 3 from the deployed position to a folded position along the existing scaffolding 2, and a removal process T23 for removing the frame member 60 of the additional scaffolding 3.

[0051] Specifically, in a floor board removal step T11 of the removal step T1, the restraint of the floor board 7 by the restraining plate 71 is released (see FIG. 18), and the floor board 7 of the additional scaffolding 3 is slid toward the existing scaffolding 2 to separate the tip of the floor board 7 from the frame member main body 6B3 (see FIG. 17). Then, the connectors 5, 5 provided on both the left and right ends of the frame member main body 6B3 are removed from the tip of the frame member main bodies 6B1, 6B2, thereby removing the frame member main body 6B3 (see FIG. 16). Next, after the floor board 7 is removed from the intermediate support frame 9 (see FIG. 15), in a support frame removal step T12, the intermediate support frame 9 is detached from the intermediate holding parts 91 provided on the frame member main bodies 6B1, 6B2 and removed (see FIG. 14).

[0052] Next, in the release step T21 of the detachment step T2, the pressure plate 53 of the connector 5 is displaced to the upper standby position shown in Figure 5, and while it is fixed to the upper plate 51 by the fixing bolt 511, the first vertical pin 61, the second vertical pin 62, and the horizontal pins 63, 63 are pulled out, etc., to release the fixed state of the frame member main body 6B1 relative to the connector 5.

[0053] Next, in a folding step T22, the frame member main bodies 6B1, 6B2 are suspended by the overhanging members 44 as needed, and their base ends are rotatably supported by the support shafts 64. With the frame member main bodies 6B1, 6B2 pulled up above the holders 54, they are rotated and displaced from the unfolded position shown in FIG. 14 to the folded position shown in FIGS. 13 and 11. Thereafter, in a removal step T23, the base ends of the frame member main bodies 6B1, 6B2 are separated and removed from the connectors 5, thereby returning them to the initial state shown in FIG. 2. Furthermore, by removing the existing scaffolding 2 from the construction object 1 as needed, the entire scaffolding structure according to the present invention can be removed. [Explanation of symbols]

[0054] 1. Construction Objects 2 Existing scaffolding 3 Additional scaffolding 4 Hanging equipment 6 Frame members 7. Flooring 8 Handrails 9 Intermediate support frame 44 Projection member 47 Operation rod 53 Presser plate 54 Holding part 55 Temporary storage area 64 Support shaft 69 Screw hole (operating hole) 81 Post 91 Intermediate holding part 541 Bottom wall 542 Side wall

Claims

1. A frame member for a scaffolding structure in which an additional scaffolding is connected to an existing scaffolding installed on a construction object via a connector, A frame member body having a base end rotatably supported by the connecting tool, and a handrail integrally attached to the frame member body, A frame member for a scaffolding structure, wherein the frame member main body is supported so as to be rotatably displaceable from a folded position along the existing scaffolding to an expanded position protruding from the existing scaffolding.

2. The handrail includes a fence member extending along the length direction of the frame member body and a support post supporting the fence member, 2. A frame member for a scaffolding structure according to claim 1, wherein the frame member body has a support bracket on a side surface thereof, the support bracket having an insertion hole into which the lower end of the support pole is inserted.

3. A support plate extending horizontally is provided on the lower portion of the support column, The frame member for a scaffolding structure according to claim 2 , wherein the frame member body has a fixed portion on an upper surface to which the support plate is fixed.

4. A frame member for a scaffolding structure as described in any one of claims 1 to 3, wherein the frame member main body is rotated and displaced from the folded position to the unfolded position while placed on the connecting device.

5. The frame member for a scaffold structure according to claim 4 , wherein the frame member body is fixed to the connector so as not to be able to rotate when in the deployed position.

6. A construction method for a scaffolding structure constructed using the frame member according to any one of claims 1 to 3, The method includes a connecting step of connecting the base end of the frame member body to the existing scaffolding via the connecting tool, and an installation step of installing floorboard materials so as to cover the space surrounded by the frame member, The connecting step includes a carrying-in step of carrying the frame member, in which the handrail is integrally attached to the frame member body, to a folding position along the existing scaffolding, and a supporting step of supporting the base end portion rotatably relative to the connecting tool, A construction method for a scaffolding structure, wherein the installation process includes an unfolding process of rotating and displacing the frame member in the folded position to an unfolded position in which it protrudes from the existing scaffolding, a fixing process of fixing the base end to the connecting part, and an attachment process of attaching the floor plate material to the fixed part.

7. A method for removing a scaffolding structure constructed by the scaffolding structure construction method according to claim 6, The method includes a removal process of removing the floorboard material from the fixed portion, and a detachment process of detaching the frame member from the existing scaffolding, A method for removing a scaffolding structure, wherein the detachment process includes a release process for releasing the fixation of the base end portion to the connector, a folding process for rotating and displacing the frame member from the unfolded position to the folded position, and a removal process for removing the frame member.

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