Suspension scaffold

Abstract

To provide a suspension scaffold which makes effective use of resources.SOLUTION: A suspension scaffold constructs a stage suspended by cables on an existing structure, wherein the stage is configured such that scaffold boards are laid on a grid formed by connecting parent beams (10) and child beams (11) into a rectangular frame. The scaffold board (1) includes a pair of girder side frames (3) having a rectangular cross section and supporting floor boards (2), and a pair of gable side frames (4) having a circular cross section and bridged to both ends of the girder side frames (3). The parent beams (10) forming the grid are provided with a plurality of support members (16) arranged at intervals, and the support members (16) are provided with circular arc grooves (30a) or square grooves (30b) for fitting and supporting the gable side frames (4) or the girder side frames (3) of the scaffold board (1).SELECTED DRAWING: Figure 16

Description

Technical Field

[0001] The present invention relates to a suspension scaffold.

Background Art

[0002] Conventionally, for the construction and repair of elevated structures such as highways and bridges and other existing structures at high altitudes, a suspension scaffold extending along the existing structure has been constructed.

[0003] Conventionally, suspension scaffolds are roughly classified into a suspension scaffold of a scaffolding board continuous connection method (Patent Documents 1 and 2) and a suspension scaffold of a stage continuous connection method (Patent Documents 3 and 4) and are known.

[0004] (Suspension scaffold of scaffolding board continuous connection method) The suspension scaffold of the scaffolding board continuous connection method is configured to construct a floor surface as a scaffold by lifting a scaffolding board called an SK panel (registered trademark) (hereinafter referred to as a "dedicated scaffolding board") with a cord such as a chain and sequentially connecting the lifted dedicated scaffolding boards to each other one by one.

[0005] Explaining this with reference to FIGS. 1 to 3, as shown in FIG. 1, the dedicated scaffolding board 1 is configured to support a rectangular floor material 2 by girder-side frames 3, 3 having a rectangular cross section formed of a pair of angular pipe materials arranged in parallel at a distance. A pair of roof-side frames 4, 4 having a circular cross section formed of circular pipe materials are installed at both ends of both sides of the floor material 2. Further, a center frame 5 formed of a circular pipe material is disposed below the center in the width direction of the floor material 2, and both ends thereof are connected by being fixed to the roof-side frame 4 by welding or the like.

[0006] When arranging a large number of dedicated scaffolding boards 1 in series, the preceding scaffolding board 1 and the subsequent scaffolding board 1 are connected by joint means 6 constituted by sockets 6a and plugs 6b provided on the roof-side frames 4, 4 while adjoining the side surfaces of the girder-side frames 3, 3 to each other.

[0007] As shown in FIGS. 2 and 3, when constructing the suspended scaffold, the dedicated scaffold boards 1 are arranged in a row along the existing structure by alternately connecting the sockets 6a and plugs 6b, and are suspended below the existing structure by a cable 7 such as a chain. In order to stably and surely perform the suspension by such a cable 7 such as a chain, window holes 8 facing the center frame 5 are provided in the floor material 2 at predetermined intervals, and an annular suspension fitting 9 facing each window hole 8 is provided in the frame 5. Therefore, the center frame 5 can be suspended by the cable 7 via the suspension fitting 9.

[0008] However, when constructing the suspended scaffold, since the dedicated scaffold boards 1 are connected while being lifted one by one with cables, the work is complicated and there is also a problem in terms of the construction period.

[0009] In particular, on the floor surface of the constructed suspended scaffold, an extremely large number of cables are stretched in close proximity, so there is a problem that the free movement of workers is hindered.

[0010] (Suspended scaffold of the stage continuous arrangement method) The suspended scaffold of the stage continuous arrangement method is constructed by constructing a stage suspended by a cable such as a chain on an existing structure, and sequentially adding and extending the stage from the leading side to the trailing side. At this time, the stage is constructed by connecting beam members to form a rectangular grid framework and laying a floor board on the grid.

[0011] The grid can form a relatively large framework so that a plurality of floor boards can be laid, and the beam members forming the grid are configured to be suspended by cables. For this reason, compared with the case of the scaffold board continuous arrangement method, the number of cables required per unit area of the floor surface is reduced, the movement of workers is easy, and it is also advantageous in terms of the construction period.

Prior art documents

Patent documents

[0012] [Patent Document 1] Japanese Patent Publication No. 3012827 [Patent Document 2] Japanese Patent Publication No. 6366472 [Patent Document 3] Japanese Patent Publication No. 7161641 [Patent Document 4] Japanese Patent Publication No. 5820848 [Summary of the Invention] [Problems to be Solved by the Invention]

[0013] From the above perspective, when comparing the suspended scaffold with the continuous staging method and the suspended scaffold with the continuous planking method, it can be said that the latter is superior to the former.

[0014] By the way, regarding the history of suspended scaffolds, initially, the suspended scaffold with the continuous planking method was the mainstream. However, later, the suspended scaffold with the continuous staging method emerged and became popular. Currently, both types of suspended scaffolds are being implemented.

[0015] Therefore, a large number of dedicated planking boards have been produced and are still in use from the time when the suspended scaffold with the continuous planking method was the mainstream until now.

[0016] Therefore, in view of this point, even when implementing the suspended scaffold with the continuous staging method, if it is configured so that the currently owned dedicated planking board can be used as the floor board laid on the grid, it can contribute to cost savings and enable effective utilization of materials.

[0017] For this reason, an object of the present invention is to provide a suspended scaffold configured such that when laying a floor board on a grid in a suspended scaffold with the continuous staging method, a dedicated planking board used in the suspended scaffold with the continuous planking method can be laid. [Means for Solving the Problems]

[0018] Therefore, what the present invention constitutes as the first means is a suspended scaffold constructed by building a stage suspended by a cable on an existing structure and successively adding extensions to the stage while extending it from the leading side to the trailing side. The stage is configured by laying a scaffold board on a grid formed by connecting a main beam and a secondary beam so as to form a rectangular frame. The scaffold board includes a pair of girder-side frames having a rectangular cross-section for supporting a floor board, and a pair of eaves-side frames having a circular cross-section installed at both ends of the girder-side frames. The main beam forming the grid is provided with a plurality of support members at intervals along the upper frame of the beam body, and by these support members, grooves for fitting and supporting the eaves-side frames of the scaffold board are provided on both sides of the upper frame.

[0019] Moreover, what the present invention constitutes as the second means is a suspended scaffold constructed by building a stage suspended by a cable on an existing structure and successively adding extensions to the stage while extending it from the leading side to the trailing side. The stage is configured by laying a scaffold board on a grid formed by connecting a main beam and a secondary beam so as to form a rectangular frame. The scaffold board includes a pair of girder-side frames having a rectangular cross-section for supporting a floor board, and a pair of eaves-side frames having a circular cross-section installed at both ends of the girder-side frames. The main beam forming the grid is provided with a plurality of support members at intervals along the upper frame of the beam body, and by these support members, angular grooves for fitting and supporting the girder-side frames of the scaffold board are provided on both sides of the upper frame.

[0020] Furthermore, as the third means of the present invention, a suspension scaffold is constructed by constructing a stage suspended by cables on an existing structure and successively adding the stage while extending it from the leading side to the trailing side. The stage is configured by laying a scaffold board on a grid formed by connecting a parent beam and a child beam so as to form a rectangular frame. The scaffold board includes a pair of girder-side frames having a rectangular cross-section for supporting a floor board, and a pair of eaves-side frames having a circular cross-section installed at both ends of the girder-side frames. The diameter D of the circular cross-section of the eaves-side frame and the width W of the rectangular cross-section of the girder-side frame are such that D > W. The parent beam forming the grid is provided with a plurality of support members at intervals along the upper frame of the beam body, and by means of the support members, support grooves for fitting and supporting the frames of the scaffold board are provided on both sides of the upper frame. The support grooves form an arc groove for fitting and supporting the eaves-side frame facing the groove opening, and a rectangular groove for fitting and supporting the girder-side frame facing the groove bottom.

[0021] In a preferred embodiment of the present invention, the scaffold board is selected from a dedicated scaffold board for a suspension scaffold provided with a pair of girder-side frames having a rectangular cross-section for supporting a floor board and a pair of eaves-side frames having a circular cross-section installed at both ends of the girder-side frames, and a temporary scaffold board provided with a pair of hooks at the eaves-side edge of the floor board. The parent beam has an upper frame and a lower frame arranged in parallel above and below the beam body, and is configured to be able to connect the child beam in a state where the upper and lower are reversed, and is configured to be able to form a grid. The lower frame arranged on the upper side by the up and down reversal constitutes a support means for fitting and supporting the hook of the temporary scaffold board.

Advantages of the Invention

[0022] According to the present invention, regarding the suspension scaffold of the stage continuous arrangement method, it can be constructed by laying the dedicated scaffold board used for the suspension scaffold of the scaffold board continuous arrangement method on the grid, so that cost can be saved and effective use of materials can be achieved.

Brief Description of the Drawings

[0023]

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Mode for Carrying Out the Invention

[0024] Hereinafter, preferred embodiments of the present invention will be described in detail based on the following drawings.

[0025] (Overall Configuration of Suspended Scaffold) As shown in Fig. 4, the suspension scaffold is constructed by sequentially adding subsequent stages while extending them in the extension direction X from the leading side X1 to the trailing side X2, with the stage S constructed on the leading side X1 as the leading stage along elevated structures such as highways and bridges and other existing structures (not shown). Further, if necessary, the subsequent stage is also extended in the width direction Y orthogonal to the extension direction X from the leading stage. Fig. 4 shows, for convenience of understanding, the ranges of each stage S1 to S5 by hatching with a dashed line.

[0026] The first stage S1 constructed on the leading side X1 is composed of a reference stage S1 constructed on a device such as the ground or an elevated work platform. After construction, the reference stage S1 is suspended by a cable C such as a chain on the existing structure, and then, using this reference stage S1 as a base for starting work in the air, subsequent stages S2 and S3 are sequentially constructed.

[0027] Each stage S is constructed by connecting the parent beam 10 and the child beam 11 to form a grid G in the shape of a rectangular frame, and laying the scaffold board 1 on the grid G. At this time, the scaffold board 1 is the dedicated scaffold board 1 described above based on Figs. 1 to 3 (hereinafter simply referred to as "scaffold board 1").

[0028] Fig. 5 shows the structure of the grid G with the scaffold board 1 removed. As shown in the figure, the grid G forms a rectangular framework by connecting the parent beam 10 and the child beam 11. There are two types of parent beams 10, namely the short parent beam 10S and the long parent beam 10L, and the grid G is mainly formed by using the long parent beam 10L. The short parent beam 10S forms grids G1a, G1b, and G1c for the reference stage S1 by combining with the child beam 11. In addition, the short parent beam 10S is used in combination with the long parent beam 10L or the child beam 11 for dimension adjustment when forming grids G of different sizes.

[0029] In the case of the illustrated embodiment, the grids G1a, G1b, and G1c that constitute the reference stage S1 are formed by arranging four short main beams 10S arranged in the extending direction X at predetermined intervals in the width direction Y, and connecting the ends of the short main beams 10S adjacent to each other in the width direction Y with sub-beams 11 to form a framework, forming three grid sections. One scaffold board 1 can be mounted on each grid section, and a reference stage S1 on which three scaffold boards 1 are mounted is formed.

[0030] (Short main beam) FIGS. 6 and 7 show the short main beam 10S. The short main beam 10S is formed shorter than the long main beam 10L, and in the case of the illustrated embodiment, it is formed to have a length dimension corresponding to the length of the side frame 4 of the scaffold board 1.

[0031] Therefore, the short main beam 10S has short columns 14 fixed to both ends of a beam body 13 in which an upper frame 12a and a lower frame 12b made of round pipes are arranged in parallel vertically.

[0032] Multi-connection brackets 15 formed by metal bracket plates are provided at the upper and lower ends of the short columns 14, and a plurality of support members 16 are arranged at intervals in the longitudinal direction on the upper frame 12a.

[0033] The short column 14 constitutes a suspension portion 17 suspended by a cable C such as a chain, and in the case of the illustrated embodiment, it is configured to insert and fix a connection fitting 18 provided on the cable C.

[0034] The multi-connection bracket 15 is provided with a tongue-shaped series connection portion 19 protruding in the longitudinal direction of the beam body 13 and an intersection connection portion 20 protruding in a direction orthogonal to the longitudinal direction. A pair of connection holes are arranged in parallel in each connection portion 19, 20. The method of using the connection holes is not particularly limited. For example, by inserting a pin into one of the connection holes, a rotatable pivot connection can be achieved, and in that state, by inserting a pin or a bolt into the other connection hole, a non-rotatable fixation can be achieved.

[0035] Of the multi - connection brackets 15 at both ends of the beam body 13, one forms the male - type bracket 15a by providing one bracket plate at each of the upper and lower ends of the short column 14, and the other forms the female - type bracket 15b by providing two stacked bracket plates with a gap therebetween at each of the upper and lower ends of the short column 14.

[0036] Therefore, for example, when connecting the short - length parent beam 10S in series in a state where it is interposed between the long - length parent beams 10L described later, as shown by the dashed line in Fig. 7, the male - type bracket 15a of the long - length parent beam 10L is inserted into the female - type bracket 15b of the short - length parent beam 10S for connection. The male - type bracket 15a of the short - length parent beam 10S on the opposite side is connected in a state where it is inserted into the female - type bracket 21b of the long - length parent beam 10L.

[0037] The support member 16 constitutes means for supporting the scaffold board 1 when laying the scaffold board 1 on the grid G, and its details will be described later.

[0038] (Long - length parent beam) Figs. 8 and 9 show the long - length parent beam 10L. The long - length parent beam 10L is formed longer than the short - length parent beam 10S, and in the illustrated embodiment, it is formed to have a length dimension corresponding to three times the length of the gable - side frame 4 in the scaffold board 1. Incidentally, in the case of the illustrated example, since the scaffold board 1 is formed such that the length of the girder - side frame 3 is three times the length of the gable - side frame 4, the length of the long - length parent beam 10L is set to the length dimension corresponding to the girder - side frame 3.

[0039] By the way, although the length of the long - length parent beam 10L is different from that of the short - length parent beam 10S, since it has a configuration common to the short - length parent beam 10S in many places, the common components are labeled with the same reference numerals as those used for the short - length parent beam 10S described above.

[0040] The long - length parent beam 10L has short columns 14 fixed at both ends of the beam body 13 in which an upper frame 12a and a lower frame 12b made of round pipes are arranged in parallel up and down.

[0041] At the upper and lower ends of one short column 14, a multi-connection bracket 15 formed by a metal bracket plate is provided, and at the upper and lower ends of the other short column 14, a series connection bracket 21 formed by a metal bracket plate is provided.

[0042] And on the upper frame 12a, a plurality of support members 16 are arranged at intervals in the longitudinal direction.

[0043] The short column 14 constitutes a suspension part 17 suspended by a cable C such as a chain. In the case of the illustrated embodiment, it is configured to insert and fix a connecting fitting 18 provided on the cable C.

[0044] The multi-connection bracket 15 is provided with a tongue-shaped series connection part 19 protruding in the longitudinal direction of the beam body 13 and an intersecting connection part 20 protruding in a direction orthogonal to the longitudinal direction. A pair of connection holes are arranged in parallel in each connection part 19, 20. This is the same as the case described for the multi-connection bracket of the short main beam 10S. At this time, the multi-connection bracket 15 constitutes a male bracket 15a provided with one bracket plate at the upper and lower ends of the short column 14.

[0045] On the other hand, the series connection bracket 21 is only provided with a tongue-shaped series connection part 22 protruding in the longitudinal direction of the beam body 13, and a pair of connection holes are arranged in parallel. At this time, the series connection bracket 21 constitutes a female bracket 21b by providing two stacked bracket plates 22a, 22b with a gap between them at the upper and lower ends of the short column 14.

[0046] The two stacked bracket plates 22a and 22b that make up the female bracket 21b form an overhanging portion 23 that protrudes from one side toward the tip with respect to the contour forming the tip edge of the metal plate, as shown in Fig. 10. At this time, the upper bracket plate 22a is provided with the overhanging portion 23 on the right side in the left-right width direction, and the lower bracket plate 22b is provided with the overhanging portion 23 on the left side in the left-right width direction. In the case of the illustrated embodiment, bracket plates of the same shape with the overhanging portion 23 are prepared, and by inverting one of the bracket plates, the upper and lower bracket plates 22a and 22b are configured in an arrangement where the overhanging portions 23 do not overlap each other.

[0047] Therefore, when observing the bracket plates 22a and 22b stacked with a gap therebetween from above, the overhanging portion 23 of the lower bracket plate 22b can be visually recognized from above. For this reason, as shown in the figure, when inserting the serial connection portion 19 of the multi-connection bracket 15 that constitutes the male bracket 15a of another long parent beam 10L into the serial connection bracket 21 that constitutes the female bracket 21b of the long parent beam 10L, by visually recognizing with the naked eye, the serial connection portion 19 can be guided to and placed on the overhanging portion 23 of the lower bracket plate 22b, and can be easily inserted into the female bracket 21b while sliding over the overhanging portion 23.

[0048] The support member 16 constitutes means for supporting the scaffold board 1 when laying the scaffold board 1 on the grid G, and its details will be described later.

[0049] (Joist) Figs. 11 and 12 show the joist 11. In the case of the illustrated embodiment, the joist 11 is formed with the same length dimension as the long parent beam 10L. That is, it has a length dimension corresponding to three times the length of the ridge-side frame 4 in the scaffold board 1 and is equivalent to the length of the girder-side frame 3.

[0050] The secondary beam 11 has short columns 26 fixed to both ends of a beam body 25 in which an upper frame 24a and a lower frame 24b made of round pipes are arranged in parallel vertically. At the upper and lower ends of each short column 26, a connecting bracket 27 formed by a metal bracket plate is provided.

[0051] The connecting bracket 27 protrudes from the short column 26 in the longitudinal direction of the beam body 25 and is provided with a locking pin 28 protruding downward from the lower surface of the bracket plate. Two locking pins 28 are arranged side by side on each connecting bracket 27. As shown in FIG. 12, they are locked by being inserted into connecting holes provided at the cross-connecting portion 20 of the multi-connecting bracket 15 in the parent beam 10 (short parent beam 10S and long parent beam 10L). At this time, it is preferable that the tip (lower end) of the locking pin 28 is formed in a conical shape.

[0052] Therefore, when a pair of parent beams 10 (short parent beam 10S or long parent beam 10L) arranged in parallel are connected to each other by the secondary beam 11, the pair of locking pins 28 of the connecting bracket 27 of the secondary beam 11 are inserted into the pair of connecting holes at the cross-connecting portion 20 of the multi-connecting bracket 15 of the parent beam 10. Thus, the parent beam 10 and the secondary beam 11 are connected in a state where they cannot rotate relative to each other. As a result, with the extension direction X as the adding direction, the parent beams 10 connected in series are fixed so as not to meander, which can contribute to the ease and safety of the work.

[0053] However, providing the locking pin 28 is not an essential requirement. The connecting bracket 27 may be configured to be connected and fixed by providing a connecting hole instead of the locking pin 28 and inserting a pin or bolt in a state where it matches the connecting hole provided at the cross-connecting portion 20 of the multi-connecting bracket 15.

[0054] (Support member of the parent beam) The support member 16 provided on the parent beam 10 (short parent beam 10S and long parent beam 10L) constitutes means for supporting the scaffold board 1 (special scaffold board) described above based on FIGS. 1 to 3, and is fixedly provided at intervals in the longitudinal direction of the upper frame 12a of the parent beam 10.

[0055] As shown in Fig. 13, the support member 16 is formed of a metal plate and has a fixing portion 29 that is fixed by welding or the like to the upper surface of the upper frame 12a of the main beam 10 and stands upright, and a pair of support grooves 30 that are located on both sides of the fixing portion 29 and open upward are formed.

[0056] By the way, when the support groove 30 constitutes means for supporting by fitting the side frame 4 of the scaffold board 1, it is preferably formed by an arcuate groove 30a along the circular cross-section of the side frame 4. Therefore, hereinafter, it will be described as the arc groove 30a, but it is not necessarily arc-shaped, and any shape that can fit and support the side frame 4 may be used.

[0057] On the other hand, when the support groove 30 constitutes means for supporting by fitting the crosswise frame 3 of the scaffold board 1, it is formed by a rectangular groove 30b along the rectangular cross-section of the crosswise frame 3.

[0058] Therefore, the support groove 30 can be formed by selecting from the arc groove 30a and the rectangular groove 30b.

[0059] By the way, in the case of the illustrated embodiment, as shown in Fig. 13(A), the diameter D of the circular cross-section of the side frame 4 of the scaffold board 1 and the width W of the rectangular cross-section of the crosswise frame 3 are formed such that D > W. Therefore, since the support groove 30 can include both the arc groove 30a and the rectangular groove 30b, as shown in Fig. 13(B), it is preferable to form the arc groove 30a facing the groove opening of the support groove 30 and form the rectangular groove 30b facing the groove bottom.

[0060] Thereby, when the support member 16 needs to support the side frame 4 of the scaffold board 1, the side frame 4 can be fitted into the arc groove 30a as shown in Fig. 13(C), and when it needs to support the crosswise frame 3, the crosswise frame 3 can be fitted into the rectangular groove 30b as shown in Fig. 13(D).

[0061] (Construction of Suspended Scaffold) Figures 14 to 18 show a method for constructing a suspension scaffold.

[0062] Figures 14 and 15 show a reference stage S1 constructed on a device such as the ground or an elevated work platform. The grids G1a, G1b, and G1c of the reference stage S1 are formed by arranging four short main beams 10S arranged in the extension direction X at predetermined intervals in the width direction Y, and connecting the ends of the short main beams 10S adjacent to each other in the width direction Y with sub-beams 11 to form a framework with three compartments.

[0063] One scaffold board 1 is mounted on each of the grids G1a, G1b, and G1c. At this time, the side frame 4 of the scaffold board 1 faces the upper frame 12a of the short main beam 10S, and the side frame 4 is fitted and supported in the arc groove 30a of the support member 16.

[0064] The constructed reference stage S1 is suspended from an existing structure by being lifted with a cable C such as a chain, and then, subsequent stages S2 and S3 are sequentially constructed using the reference stage S1 as a base for starting work in the air.

[0065] As shown in Figures 16 to 18, the grids constituting the subsequent stages are mainly formed by arranging long main beams 10L in series in the extension direction X and connecting the sub-beams 11 and the long main beams 10L in the width direction Y.

[0066] Regarding the extension direction X, the long main beams 10L are arranged in series by connecting the series connection part 19 in the male bracket 15a of the multi-connection bracket 15 at one end and the female bracket 21b of the series connection bracket 21 at the other end.

[0067] The connection bracket 27 of the sub-beam 11 is connected to the cross-connection part 20 of the multi-connection bracket 15 in the long main beams 10L arranged in series from the width direction Y. Alternatively, the series connection bracket 21 of the long main beam 10L may be connected.

[0068] As an example, in the embodiment shown in FIG. 16, the grids G2 to G4 are formed by arranging a plurality of long main beams 10L side by side in the width direction Y. And the scaffold board 1 is mounted on the grid with the wife-side frame 4 arranged in parallel with the long main beam 10L, and the wife-side frame 4 is fitted into and supported by the arc groove 30a of the support member 16.

[0069] On the other hand, for example, in the grid G5, a pair of long main beams 10L are connected to the long main beams 10L arranged in series from the width direction Y, and the subsidiary beams 11 are connected to the ends of the long main beams 10L in the width direction Y.

[0070] Therefore, the scaffold board 1 mounted on the grid G5 is supported by fitting the wife-side frame 4 into the arc groove 30a of the support member 16 in the long main beam 10L arranged in the width direction Y, and further, the girder-side frame 3 is supported by fitting into the square groove 30b of the support member 16 in the long main beam 10L arranged in the extension direction X.

[0071] (Support of the wife-side frame by the arc groove) FIGS. 19 and 20 show a state in which the wife-side frame 4 of the scaffold board 1 is supported by the support member 16 of the main beam 10 (short main beam 10S or long main beam 10L).

[0072] As shown in FIG. 20, since the support member 16 is provided with arc grooves 30a on both sides of the fixing portion 29 standing up from the upper frame 12a of the main beam 10, a pair of scaffold boards 1 are well laid in a state of being aligned along both sides of the main beam 10.

[0073] (Support of the girder-side frame by the square groove) FIGS. 21 and 22 show a state in which the girder-side frame 3 of the scaffold board 1 is supported by the support member 16 of the main beam 10 (short main beam 10S or long main beam 10L).

[0074] As shown in FIG. 22, since the support member 16 is provided with angular grooves 30b on both sides of a fixing portion 29 standing up from the upper frame 12a of the parent beam 10, a pair of scaffold boards 1 are well laid in a state of being aligned along both sides of the parent beam 10.

[0075] (Another Embodiment of the Grid) FIGS. 23 to 25 show another embodiment of the present invention. The parent beams 10 (short parent beam 10S and long parent beam 10L) and the child beams 11 are connected by multi-connection brackets 15, series connection brackets 21, and connection brackets 27 in the same manner as in the above-described embodiment to form a grid. However, as shown in the drawing, the grid is constructed with the upper and lower portions of the upper frame 12a and the lower frame 12b of the parent beam 10 (short parent beam 10S and long parent beam 10L) reversed.

[0076] Therefore, in the case of another embodiment, since the support member 16 of the parent beam 10 is arranged downward, the scaffold board 1 (dedicated scaffold board) described above with reference to FIGS. 1 to 3 cannot be mounted. Instead, it is configured to be able to mount a temporary scaffold board 31 that has been widely used in temporary scaffolds.

[0077] The temporary scaffold board 31 is provided with a pair of hooks 31b at the side edge of the floor board 31a, and is configured to form a work floor by locking and fixing the hooks 31b to a horizontal member made of a circular pipe in a temporary scaffold.

[0078] Therefore, as shown in FIGS. 24 and 25, the parent beams 10 (short parent beam 10S and long parent beam 10L) with the grid formed by inverting the upper and lower portions are formed with the lower frame 12b arranged on the upper side in this state as a round pipe with a circular cross-section, and the outer diameter of the pipe is formed to fit the hooks 31b.

[0079] Thereby, the lower frame 12b of the parent beam 10 constitutes a support means 32 for fitting and supporting the hooks 31b of the temporary scaffold board 31.

[0080] As described above, in the case of the embodiments shown in FIGS. 4 to 22, there is an advantage that the existing dedicated scaffold 1 used in the conventional suspension scaffold can be utilized, and in the case of the other embodiments shown in FIGS. 23 to 25, there is an advantage that the existing temporary scaffold board 31 used in the conventional temporary scaffold can be utilized.

Explanation of Signs

[0081] 1 Dedicated scaffold board 2 Floor material 3 Girder side frame 4 Gable side frame 5 Center frame 6 Joint means 6a Socket 6b Plug 7 Cable 8 Window hole 9 Suspension fitting S Stage G Grid C Cable 10 Main beam 10S Short main beam 10L Long main beam 11 Sub-beam 12a Upper frame 12b Lower frame 13 Beam body 14 Short column 15 Multi-connection bracket 15a Male bracket 15b Female bracket 16 Support member 17 Suspension part 18 Connection fitting 19 Series connection part 20 Cross connection part 21 Series connection bracket 21b Female bracket 22 Series connection part 22a, 22b Bracket plates 23 Overhanging part 24a Upper frame 24b Lower frame 25 Beam body 26 Short column 27 Connecting bracket 28 Locking pin 29 Fixed part 30 Support groove 30a Arc groove 30b Angular groove 31 Scaffold board for temporary scaffold 31a Floor covering 31b Hook 32 Support means

Claims

1. A suspended scaffold constructed by constructing a stage suspended by a cable on an existing structure and successively adding and constructing the stage while extending it from the leading side to the trailing side, wherein the stage is configured by laying a platform board on a grid formed by connecting a main beam (10) and a sub-beam (11) so as to form a rectangular frame, the platform board (1) includes a pair of girder-side frames (3) having a rectangular cross section for supporting a floor board (2) and a pair of eaves-side frames (4) having a circular cross section installed at both ends of the girder-side frame (3), the main beam (10) forming the grid is provided with a plurality of support members (16) at intervals along the upper frame (12a) of the beam body, and by the support members (16), grooves (30a) are provided on both sides of the upper frame (12a) for fitting and supporting the eaves-side frames (4) of the platform board (1). The suspended scaffold is characterized by this.

2. A suspended scaffold constructed by constructing a stage suspended by a cable on an existing structure and successively adding and constructing the stage while extending it from the leading side to the trailing side, wherein the stage is configured by laying a platform board on a grid formed by connecting a main beam (10) and a sub-beam (11) so as to form a rectangular frame, the platform board (1) includes a pair of girder-side frames (3) having a rectangular cross section for supporting a floor board (2) and a pair of eaves-side frames (4) having a circular cross section installed at both ends of the girder-side frame (3), the main beam (10) forming the grid is provided with a plurality of support members (16) at intervals along the upper frame (2a) of the beam body, and by the support members (16), angular grooves (30b) are provided on both sides of the upper frame (12a) for fitting and supporting the girder-side frames (3) of the platform board (1). The suspended scaffold is characterized by this.

3. A suspended scaffold constructed by constructing a stage suspended by a cable on an existing structure and successively adding and constructing the stage while extending it from the leading side to the trailing side, wherein the stage is configured by laying a platform board on a grid formed by connecting a main beam (10) and a sub-beam (11) so as to form a rectangular frame, The scaffold board (1) includes a pair of girder-side frames (3) with a rectangular cross-section for supporting the floor board (2), and a pair of purlin-side frames (4) with a circular cross-section installed at both ends of the girder-side frames (3). The diameter D of the circular cross-section of the purlin-side frame (4) and the width W of the rectangular cross-section of the girder-side frame (3) satisfy D > W. The main beam (10) forming the grid arranges a plurality of support members (16) at intervals along the upper frame (12a) of the beam body. By means of the support members (16), support grooves (30) are provided on both sides of the upper frame (12a) to fit and support the frames (3, 4) of the scaffold board (1). The support groove (30) is characterized in that a groove (30a) for fitting and supporting the purlin-side frame (4) is formed facing the groove opening, and a rectangular groove (30b) for fitting and supporting the girder-side frame (3) is provided facing the groove bottom, forming a suspended scaffold.

4. The scaffold board is selected from a dedicated scaffold board (1) for a suspended scaffold provided with a pair of girder-side frames (3) with a rectangular cross-section for supporting the floor board (2) and a pair of purlin-side frames (4) with a circular cross-section installed at both ends of the girder-side frames (3), and a temporary scaffold board (31) provided with a pair of hooks (31b) at the purlin-side edge of the floor board (31a). The main beam (10) has an upper frame (12a) and a lower frame (12b) arranged in parallel above and below the beam body. It is configured to be able to connect the secondary beams (11) in a state where the upper and lower are reversed, and is configured to be able to form a grid. The lower frame (12b) arranged on the upper side by turning upside down constitutes a support means (32) for fitting and supporting the hook (31b) of the temporary scaffold board (31). The suspended scaffold according to claim 1, 2 or 3, characterized in that.

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