Construction method and construction device for suspended scaffolding

Abstract

To provide a construction method and construction devices for a suspended scaffolding.SOLUTION: A construction method of a suspended scaffolding constructs stages suspended with cables on an existing structure and expands the stage by sequentially extending the stage from the preceding side towards the subsequent side. The construction method, for constructing a subsequent stage (S2) after a preceding stage (S1) previously constructed, is constituted in such a way that: a subsequent-side girder member (4) to be arranged in the subsequent stage, while its first connection part (26) arranged at its tale end vicinity part having been linked to the main beam (1a) of the subsequent stage, has its second connection part (27), which is arranged in its forward tip vicinity, positioned below a basis member (51) that is suspended with a cable; and after that, the second connection part (27) is pulled up to a designated level towards the aforesaid basis member (51) by lift-secure means (38) provided across the basis member (51) and the second connection part (27), and is fixed to the basis member (51).SELECTED DRAWING: Figure 21

Description

Technical Field

[0001] The present invention relates to a method for constructing a suspension scaffold and an apparatus for implementing the construction method.

Background Art

[0002] Conventionally, when constructing or renovating 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] The suspension scaffold is constructed by constructing a stage suspended by a cable such as a chain on the existing structure, and sequentially adding extensions to the stage while extending it from the leading side to the trailing side.

[0004] At this time, the stage is constructed by forming a grid framework by connecting beam members and laying a floor board on the grid.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] Since the suspension scaffold forms a grid framework by connecting beam members in the air, dangerous work is forced. Therefore, in order to ensure safety and enable rapid construction, it is desirable to configure the structure so that a structure with high strength can be constructed with as easy work as possible.

[0007] An object of the present invention is to provide a method for constructing a suspension scaffold and a construction apparatus that can meet such needs.

Means for Solving the Problem

[0008] Therefore, the construction method of the suspended scaffold of the present invention is configured as a means to construct a stage suspended by a cable on an existing structure, and sequentially add and extend the stage from the leading side to the trailing side. The stage is formed by arranging main beams and secondary beams formed by suspending beam members with cables in parallel on the leading side and the trailing side, a grid formed by connecting the main beams and the secondary beams at intervals in the parallel direction with girder members, and a floor board laid on the grid. When constructing a subsequent stage with respect to a previously constructed leading stage, the trailing side girder member provided on the subsequent stage has a first connecting portion provided near the tail end of the girder member connected to the main beam of the subsequent stage, and a second connecting portion provided near the tip facing downward below a reference member suspended by a cable. Then, by lift fixing means provided between the reference member and the second connecting portion, the second connecting portion is pulled up to a predetermined height position toward the reference member and fixed to the reference member.

[0009] In an embodiment of the present invention, the reference member is constituted by a secondary beam suspended by a cable.

[0010] In another embodiment of the present invention, the reference member is constituted by a support member suspended by a cable, and after fixing the second connecting portion of the girder member by the lift fixing means, a secondary beam is fixed to the support member.

[0011] And the lift fixing means as an apparatus for implementing the construction method of the suspended scaffold of the present invention is constituted by an insertion hole penetrating vertically through the reference member, a headed bolt inserted into the insertion hole from above, and a nut provided on the second connecting portion. With the second connecting portion facing downward below the reference member, the headed bolt inserted into the insertion hole is screwed into the nut, and after pulling up the nut by rotating the headed bolt, it is fixed by fastening.

Advantages of the Invention

[0012] According to the present invention, in the subsequent stage, the subsequent side digit member 4 has the first connecting portion 26 in the vicinity of the tail end connected and fixed to the main beam 1a, and the second connecting portion 27 provided in the vicinity of the tip end faces downward of the reference member 51 suspended at a predetermined height position by a cable. Between the reference member 51 and the second connecting portion 27, the second connecting portion 27 is pulled up to a predetermined height position and fixed to the reference member 51 by the lift fixing means 38. Therefore, an operator can board the cantilever-supported digit member 4 and perform work safely and easily. Moreover, by suspending the reference member 51 at a predetermined height position by a cable, there is an effect that the horizontal extension of the constructed stage can be easily performed.

Brief Description of the Drawings

[0013]

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Embodiments for Carrying Out the Invention

[0014] The preferred embodiments of the present invention will be described in detail below with reference to the drawings.

[0015] (Overall Configuration) As shown in FIG. 1, the suspension scaffold is constructed by sequentially adding subsequent stages while extending them in the extension direction X from the leading side X1 toward the trailing side X2, with the stage S constructed on the leading side X1 as the leading stage along an elevated structure such as a highway or a bridge or other existing structures (not shown). At this time, if necessary, the subsequent stage may be extended in the width direction Y orthogonal to the extension direction X from the leading stage.

[0016] The stage S constructed first 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 from the existing structure by a cable C such as a chain, and then, using this reference stage S1 as a base for starting work in the air, subsequent stages S2 and S3 are sequentially constructed.

[0017] The stage S is constructed by arranging beam members 1 extending in the width direction Y in parallel on the leading side X1 and the trailing side X2 to form a main beam 1a and a secondary beam 1b, a grid G formed by a framework including the main beam 1a and the secondary beam 1b, and a floor board 2 laid on the grid G.

[0018] Therefore, regarding the relationship between the leading stage and the subsequent stage, when constructing the subsequent stage S2, the secondary beam 1b of the leading stage S1 is made to also serve as the main beam 1a of the subsequent stage S2. Accordingly, a secondary beam 1b is formed by arranging one beam member 1 on the trailing side X2, and a grid G for the stage S2 is constructed between the main beam 1a and the secondary beam 1b.

[0019] At this time, the grid G is formed by the main beam 1a and the secondary beam 1b arranged in parallel, a side frame 3 connecting both ends of the main beam 1a and the secondary beam 1b, and a plurality of cross members 4 connecting the main beam 1a and the secondary beam 1b at intervals in the parallel direction (the width direction Y in the figure).

[0020] (Beam member) The beam member 1 may be constituted by a single member extending in the width direction Y. However, in the case of the illustrated embodiment, it is formed by connecting and arranging a long basic beam 5a and a short extension beam 5b in series in the width direction Y, and in the case of the illustrated embodiment, they are integrally connected by a connecting fitting 12 described later.

[0021] As shown in FIGS. 3 and 4, the basic beam 5a and the extension beam 5b are substantially the same in configuration except for their different lengths, and are formed into a cross-sectional shape by combining steel materials having an L-shaped cross-section and fixing them integrally by welding or the like, and include a vertical upper plate portion 6a and a vertical lower plate portion 6b, and a horizontal front plate portion 7a and a horizontal rear plate portion 7b extending in the front-rear direction of the extension direction X.

[0022] Among the vertical upper plate portion 6a and the vertical lower plate portion 6b, a predetermined number of suspension holes 8 are formed through the vertical upper plate portion 6a at intervals in the longitudinal direction, and a cord C such as a chain is connected to the predetermined suspension holes 8. Further, fixing holes 14 for fixing a connecting fitting 12 described later are formed through the vertical lower plate portion 6b.

[0023] Among the suspension holes 8 provided in the vertical upper plate portion 6a, several selected holes are used as locking holes 8a for locking a fixing fitting 39 for accessories described later (see FIG. 12), and are also used as pivot holes 8b for pivotally supporting a pressing fitting 43 described later (see FIG. 13).

[0024] Among the horizontal front plate portion 7a and the horizontal rear plate portion 7b, a notch portion 33 and a fixing hole 34 corresponding to a first connecting portion 26 of a girder member 4 described later are provided in the horizontal front plate portion 7a (see FIGS. 4 and 11), and an insertion hole 36 corresponding to a second connecting portion 27 of the girder member 4 described later is provided in the horizontal rear plate portion 7b (see FIGS. 3 and 11).

[0025] A front connecting plate 9a fixedly provided so as to close the space between the vertical upper plate portion 6a and the horizontal front plate portion 7a, and a rear connecting plate 9b fixedly provided so as to close the space between the vertical upper plate portion 6a and the horizontal rear plate portion 7b are provided at both ends of each of the basic beam 5a and the extension beam 5b, and bolt insertion holes 10 are formed in the front connecting plate 9a and the rear connecting plate 9b.

[0026] As a result, when the basic beam 5a and the extension beam 5b are arranged in series in the width direction Y, the respective front connecting plates 9a and rear connecting plates 9b are overlapped with each other, and the bolt insertion holes 10 are communicated with each other. At this time, as shown in the figure, since the nut 11 is fixed to one of the two overlapped connecting plates 9a, 9b by welding or the like, the basic beam 5a and the extension beam 5b are connected by fastening the bolt (not shown) inserted through the insertion hole 10 to the nut 11.

[0027] Furthermore, as shown in FIG. 5, the vertical lower plate portion 6b of the basic beam 5a and the vertical lower plate portion 6b of the extension beam 5b are integrally connected by a connecting fitting 12. The connecting fitting 12 includes groove-shaped side walls 12a, 12b into which the vertical lower plate portion 6b is fitted. With the pin 13 provided at the extension of one side wall 12a inserted and locked into the fixing hole 14 provided in one of the vertical lower plate portions 6b of the basic beam 5a and the extension beam 5b, a bolt 16a is inserted through the insertion holes 15 penetrating through the side walls 12a, 12b and a nut 16b is fastened to the fixing hole 14 provided in the other vertical lower plate portion 6b.

[0028] (Side Frame) As shown in FIGS. 6 and 7, the side frame 3 is formed of an angle pipe material extending in the X direction, and fixing plates 17 fixed to the lower surfaces of both ends are respectively projected from the ends, and insertion holes 18 are provided in the projecting portions.

[0029] Therefore, as shown in the figure, the side frame 3 is arranged between both ends of the main beam 1a and both ends of the secondary beam 1b. The fixing plates 17 are overlapped on the lower surfaces of the horizontal front plate portion 7a of the main beam 1a and the horizontal rear plate portion 7b of the secondary beam 1b, and are fixed by bolts 19a and nuts 19b through the insertion holes 18. For this reason, bolt insertion holes 20 are provided in the horizontal front plate portion 7a and the horizontal rear plate portion 7b.

[0030] In the illustrated embodiment, as shown in FIGS. 1 and 2, the grid G for constructing the stage S is formed by connecting both ends of the basic beam 5a and both ends of the extension beam 5b by four side frames 3 between the main beam 1a and the sub-beam 1b. That is, between the main beam 1a and the sub-beam 1b, a wide grid G1 framed by connecting both ends of the basic beam 5a with the side frames 3 and a narrow grid G2 framed by connecting both ends of the extension beam 5b with the side frames 3 are connected in series, and as a whole, one grid G is formed, and the stage S is formed by laying the floor board 2.

[0031] Therefore, the floor board 2 is composed of a long floor board 2a laid on the wide grid G1 and a short floor board 2b laid on the narrow grid G2.

[0032] (Stringer member) As shown in FIGS. 8 to 11, the stringer member 4 forms a rigid frame structure by arranging an upper frame 21 and a lower frame 22 formed of round pipe materials in parallel up and down and connecting and integrating them with a bundled material 23, and support plates 24 and 25 for connecting both ends of both frames 21 and 22 facing the leading side X1 and the trailing side X2 in the X direction are provided.

[0033] At this time, as shown in the figure, the lower frame 22 is formed to have a longer dimension than the upper frame 21, and overhanging portions 24a and 25a facing both ends of the upper frame 21 are provided by support plates 24 and 25 standing up from the lower frame 22.

[0034] Therefore, the upper frame 21 is provided with a first connecting portion 26 at the overhanging portion 24a facing the leading side X1 in the X direction and a second connecting portion 27 at the overhanging portion 25a facing the trailing side X2.

[0035] The first connecting portion 26 is composed of a nut 28 that extends longitudinally in the vertical direction and a locking pin 29 with a flange arranged side by side. The nut 28 is fixed by welding or the like to a notch formed in the overhanging portion 24a. The locking pin 29 is fixed by welding or the like to a bracket 24b fixed so as to intersect the overhanging portion 24a. At this time, in the vertical height direction, as shown by reference sign (h) in FIG. 8(C), the flange 29a of the locking pin 29 is arranged at a position higher than the upper end of the nut 28. Note that the height difference (h) is equal to or slightly larger than the thickness (t) of the horizontal front plate portion 7a of the beam member 1.

[0036] The second connecting portion 27 is composed of a nut 30 that extends longitudinally in the vertical direction. The nut 30 is fixed by welding or the like to a notch formed in the overhanging portion 25a.

[0037] And, the lower frame 22 forms a contact portion 31 by a flat plate 31a fixed to an end portion facing the leading side X1 in the X direction, and forms a support portion 32 by a flat plate 32a fixed to an end portion facing the trailing side X2.

[0038] (Relationship between the first connecting portion and the main beam) As shown in FIG. 9, at a predetermined position where the beam member 1 connects the girder members 4, a notch portion 33 and a fixing hole 34 are arranged side by side on the horizontal front plate portion 7a. The notch portion 33 is formed to have a size that allows the locking pin 29 of the first connecting portion 26 to be inserted and supports the lower surface of the flange 29a. Further, the fixing hole 34 is formed to have the same diameter as or slightly larger than the nut 28 of the first connecting portion 26.

[0039] When connecting the girder member 4 to the beam member 1 constituting the main beam 1a, as shown in FIGS. 9 and 10, with the girder member 4 in an obliquely intersecting posture with respect to the beam member 1, when the locking pin 29 of the first connecting portion 26 is inserted into the notch portion 33 from the obliquely intersecting direction, the flange 29a can be placed on the horizontal front plate portion 7a of the beam member 1. In this state, the notch portion 33 is locked to the lower surface of the flange 29a, thereby preventing the girder member 4 from falling, and the girder member 4 is supported so as to be rotatable around the axis of the locking pin 29.

[0040] Subsequently, by rotating around the axis of the locking pin 29, when the girder member 4 is made orthogonal to the beam member 1, as shown in FIG. 11, the nut 28 of the first connecting portion 26 enters the lower surface of the horizontal front plate portion 7a of the beam member 1 and overlaps with the fixing hole 34.

[0041] Therefore, by inserting the headed bolt 35 from above the fixing hole 34 and screwing it onto the nut 28, the girder member 4 is connected and fixed to the beam member 1 (main beam 1a) by the first connecting portion 26.

[0042] In this way, the girder member 4 remains in an obliquely intersecting posture with respect to the main beam 1a, and is supported rotatably while being prevented from falling by the first connecting portion 26 on the tail end side, so that the operator can perform work safely and easily from the preceding stage.

[0043] (Relationship between the second connecting portion and the secondary beam) As shown in FIG. 11, the beam member 1 is provided with an insertion hole 36 in the horizontal rear plate portion 7b at a predetermined position for connecting the girder member 4. At this time, the insertion hole 36 is provided at a position aligned with the fixing hole 34 in the X direction, and is formed to have the same diameter as or slightly larger than the nut 30 of the second connecting portion 27.

[0044] Therefore, when the nut 30 of the second connecting portion 27 of the girder member 4 is made to enter the lower side of the horizontal rear plate portion 7b with respect to the secondary beam 1b, the nut 30 overlaps with the insertion hole 36. Thus, by inserting the headed bolt 37 from above the insertion hole 36 and screwing it onto the nut 30, the girder member 4 is connected and fixed to the beam member 1 (secondary beam 1b) by the second connecting portion 27.

[0045] Incidentally, the nut 30 of the second connecting portion 27, the insertion hole 36, and the headed bolt 37 constitute a lift fixing means 38, which will be described later.

[0046] (Fixing fitting for accessories) FIG. 12 shows a fixing fitting 39 for fixing accessories. The fixing fitting 39 is provided with a clamp fitting 41 on a fixing base 40, and as shown in FIGS. 1 and 2, it is attached to the beam member 1 facing a predetermined position of the stage S.

[0047] Since the clamp fitting 41 is a well-known fastening fitting used in a temporary scaffold or the like, a detailed description thereof will be omitted.

[0048] The fixing base 40 forms a top plate portion 40a, a side plate portion 40b, and an inclined plate portion 40c that is bent so as to chamfer the corner therebetween by bending a metal plate, and the clamp fitting 41 is fixed to the top plate portion 40a.

[0049] And a bolt 42 that is screwed to be able to advance and retreat obliquely downward is provided on the inclined plate portion 40c via a female screw such as a nut.

[0050] A foot plate 40d is vertically provided on the lower surface of the top plate portion 40a, and when the side plate portion 40b is placed on the horizontal front plate portion 7a of the beam member 1, the foot plate piece 40d is configured to be placed on the horizontal rear plate portion 7b. And a protrusion 40e provided on the inner edge of the foot plate piece 40d is configured to be inserted and locked into the suspension hole 8 provided on the vertical upper plate portion 6a of the beam member 1.

[0051] Therefore, when the bolt 42 is advanced, the fixing fitting 39 can be easily attached to a predetermined position of the beam member 1 by sandwiching the vertical upper plate portion 6a of the beam member 1 between the foot plate 40d and the tip of the bolt 42.

[0052] (Pressing fitting) FIGS. 13 to 15 show a pressing fitting 43 for preventing the floor board 2 laid on each stage S from lifting. The pressing fitting 43 is installed between the main beam 1a and the secondary beam 1b facing a predetermined position of the stage S as shown in FIGS. 1 and 2.

[0053] The pressing fitting 43 includes a rod member 44 that crosses over the floor board 2 and is disposed across between the main beam 1a and the secondary beam 1b, arm portions 45a and 45b that are vertically provided obliquely downward from both ends of the rod member 44, and tongue pieces 46 that project oppositely from the pair of arm portions 45a and 45b. And an operating bolt 49 is screwed into the tongue piece 46 so as to be able to advance and retreat from above.

[0054] The arm portions 45a and 45b located at both ends of the rod member 44 are configured to fit and be inserted between the vertical upper plate portions 6a of the main beam 1a and the secondary beam 1b. One arm portion 45a is provided with a fixing pin 47 to be inserted into the pivot hole 8c of the vertical upper plate portion 6a of the main beam 1a, and the other arm portion 45b is provided with a detachable pin 48 to be inserted into the pivot hole 8c of the vertical upper plate portion 6a of the secondary beam 1b.

[0055] Therefore, when fitting the pair of arm portions 45a and 45b between the vertical upper plate portions 6a and 6a of the main beam 1a and the secondary beam 1b, by inserting the fixing pin 47 projecting from one arm portion 45a into one pivot hole 8b, the other arm portion 45b is aligned along the vertical upper plate portion 6a, and in this state, the detachable pin 48 may be inserted into the other pivot hole 8b through the pin hole 48a of the arm portion 45b.

[0056] At this time, as shown in FIG. 14, the tip of the operating bolt 49 abuts on the upper surfaces of the horizontal front plate portion 7a and the horizontal rear plate portion 7b of the main beam 1a and the secondary beam 1b. However, if the operating bolt 49 is retracted, the rod member 44 faces an upper position where it does not interfere with the floor board 2, so that the pressing fitting 43 can be suitably installed.

[0057] And after installation, as shown in FIG. 15, when the operating bolt 49 is advanced, the arm portions 45a and 45b are rotated about the pins 47 and 48, whereby the rod member 44 is aligned along the upper surface of the floor board 2 to prevent the floor board 2 from lifting.

[0058] (Construction method of subsequent stage) As described above, the present invention relates to a method for sequentially constructing a subsequent stage S2 from a preceding stage S1, and preferred embodiments thereof will be described below.

[0059] (Connecting process of girder members) When constructing the subsequent stage S2, by using the secondary beam 1b of the preceding stage S1 as the main beam 1a of the subsequent stage S2, first, as shown in FIG. 16, a process of connecting the tail end portion of the girder member 4 to the main beam 1a (hereinafter referred to as the "tail end connection process of the girder member") is carried out. At this time, the girder members 4 with their tail end portions connected are aligned in the X direction. Then, as shown in FIG. 17, a new secondary beam 1b is installed, and a process of connecting the tip end portion of the girder member 4 to the secondary beam 1b (hereinafter referred to as the "tip end connection process of the girder member") is carried out.

[0060] As shown in FIG. 17, the subsequent stage S2 is formed by connecting the main beam 1a and the secondary beam 1b with the girder members 4 and laying the floor slab 2 on the framed grid G by connecting both ends with the side frames 3.

[0061] Regarding this point, the connecting process of the side frame 3 may be carried out either before or after the tip end connection process of the girder member.

[0062] Also, the laying process of the floor slab 2 may be carried out either before or after the tip end connection process of the girder member. However, in the embodiments described below, it is carried out after the tail end connection process of the girder member and before the tip end connection process of the girder member.

[0063] (Tail end connection process of girder members) FIGS. 18 and 19 show the tail end connection process of the girder member. For convenience of explanation and understanding, the girder members arranged in the preceding stage S1 are denoted by reference numeral 4a, and the girder members installed in the subsequent stage S2 are denoted by reference numeral 4 (FIGS. 16 and 17 also show the girder members with the same reference numerals).

[0064] The girder member 4 installed in the subsequent stage S2 is connected to the main beam 1a by the first connecting portion 28 at the tail end on the extension line of the longitudinal axis of the leading girder member 4a provided in the preceding stage S1. At this time, the girder member 4 is rotatably supported by the locking pin 29 with a flange in the notch portion 33 of the main beam 1a, and in a state orthogonal to the beam member 1 by rotation, the headed bolt 35 is fastened to the nut 28 of the first connecting portion 26 to be fixed. This point is as described above based on FIGS. 9 to 10.

[0065] Incidentally, as shown in FIGS. 18 and 19, when the subsequent girder member 4 is orthogonal to the main beam 1a and aligned on the extension line of the longitudinal axis of the leading girder member 4a, it is located below the main beam 1a, and the abutting portion 31 of the subsequent girder member 4 abuts against the supporting portion 32 of the leading girder member 4a.

[0066] The abutting portion 31 and the supporting portion 32 are constituted by flat plates 31a and 32a fixed to both ends of the lower frame 22, and the plate surfaces are brought into surface contact with each other in a state where the supporting frames 22 and 22 of the leading and subsequent girder members 4a and 4 are coaxially aligned.

[0067] Therefore, the subsequent girder member 4 is cantilever-supported by the main beam 1a so as to withstand a predetermined load, and thus it is possible for an operator to perform work while walking on it.

[0068] And after connecting a predetermined number of girder members 4 to the main beam 1a, the floor board 2 can be laid, and it is possible for an operator to continue to perform the tip connection process of the girder member to the secondary beam 1b on the floor board 2.

[0069] (Additional Embodiment) FIG. 20 shows an additional embodiment in which locking means 50 is provided between the abutting portion 31 and the supporting portion 32.

[0070] In the case of the illustration, the locking means 50 is composed of a receiving portion 50a formed by a hole or a recess formed in the support portion 32 and a protruding portion 50b protruding from the contact portion 31. When the contact portion 31 is brought into contact with the support portion 32, the protruding portion 50b fits into the receiving portion 50a, preventing the contact portion 31 and the support portion 32 from moving relative to each other in the lateral displacement direction.

[0071] (Tip connection process of the girder member) Figs. 21 to 24 show the tip connection process of the girder member. The girder member 4 cantilevered on the main girder 1a by the above-described tail end connection process of the girder member is lifted by the lift fixing means 38 to a predetermined position toward the reference member 51 while facing downward below the reference member 51 suspended by the cable C at the second connection portion 27 provided in the vicinity of the tip, and is fixed to the reference member 51 at that position. At this time, the reference member 51 is suspended at a predetermined height position by the cable C.

[0072] In the case of the embodiment shown in Figs. 21 to 24, the reference member 51 is composed of a secondary girder 1b suspended by the cable C. Therefore, the reference member 51 is suspended at the same height position as the main girder 1a. And the lift fixing means 38 is composed of a nut 30 forming the second connection portion 27, an insertion hole 36 provided in the reference member 51 (secondary girder 1b), and a headed bolt 37, as described above.

[0073] As described above, when an operator boards on the girder member 4 cantilevered on the main girder 1a, or when the operator boards on the floor board 2 laid on the girder member 4, as shown in Fig. 22, the upper and lower frames 21, 22 extending from the cantilever support portion by the contact portion 31 and the support portion 32 are inclined downward slightly, so that a height difference D occurs between the horizontal rear plate portion 7b of the reference member 51 (secondary girder 1b) provided with the insertion hole 36 and the second connection portion 27.

[0074] Therefore, in the leading end connection process of the girder member, as shown in FIG. 23, a headed bolt 37 is inserted into the insertion hole 36 from above, and the bolt 37 is driven to rotate while being screwed into the nut 30 (the second connection portion 27). As a result, as shown in FIG. 24, the leading end of the girder member 4 is pulled up together with the nut 30, and is fastened in a state where the nut 30 abuts against the lower surface of the horizontal rear plate portion 7b of the reference member 51 (the secondary beam 1b).

[0075] Thereby, the subsequent stage S2 is flush with the preceding stage S1, and the subsequent stage S2 provided with the horizontal floor plate 2 is constructed.

[0076] (Another Embodiment of the Leading End Connection Process of the Girder Member) FIGS. 25 and 26 show another embodiment of the leading end connection process of the girder member. As shown in FIG. 25, the girder member 4 cantileveredly supported by the main beam 1a by the above-described trailing end connection process of the girder member is suspended below the reference member 51 suspended at a predetermined height position by the cable C at the second connection portion 27 provided in the vicinity of the leading end, and is pulled up to a predetermined position toward the reference member 51 by the lift fixing means 38 and fixed to the reference member 51 at that position. In the case of this embodiment, the reference member 51 is constituted by a support member 52 for connecting and fixing the secondary beam 1b thereafter.

[0077] Therefore, as shown in FIG. 25(B), after the second connection portion 27 of the girder member 4 is connected and fixed to the support member 52 as the reference member 51, the secondary beam 1b is fixed to the support member 52 via the connection fixing means 53. The height position of the reference member 51 is set in advance so that the secondary beam 1b has the same height as the main beam 1a when the secondary beam 1b is connected and fixed to the reference member 51. Thereby, the horizontal extension of the stage can be easily performed.

[0078] In the case of this embodiment, when the secondary beam 1b is further used as the main beam 1a in the subsequent stage S3 and the first connecting portion 26 of the subsequent side girder member 4b is connected and fixed, the distance L between the first connecting portion 26 of the preceding side girder member 4 and the second connecting portion 27 of the subsequent side girder member 4b becomes longer. However, by extending the mutual lower frames 22, 22 so as to be close to each other, the contact portion 31 is configured to contact the support portion 32.

Explanation of Signs

[0079] X Extension direction X1 Preceding side X2 Subsequent side Y Width direction S Stage C Cable G Grid 1 Beam member 1a Main beam 1b Secondary beam 2, 2a, 2b Floor board 3 Side frame 4, 4a, 4b Girder member 5a Basic beam 5b Extension beam 6a Vertical upper plate portion 6b Vertical lower plate portion 7a Horizontal front plate portion 7b Horizontal rear plate portion 8 Suspension hole 8a Locking hole 8b Pivot hole 9a Front connecting plate 9b Rear connecting plate 10 Bolt insertion hole 11 Nut 12 Connecting fitting 12a, 12b Side wall 13 Pin 14 Fixing hole 15 Insertion hole 16a Bolt 16b Nut 17 Fixing plate 18 Insertion hole 19a Bolt 19b Nut 20 Bolt insertion hole 21 Upper frame 22 Lower frame 23 Bundle material 24, 25 Support plates 24a, 25a Overhanging parts 24b Bracket 26 First connecting part 27 Second connecting part 28 Nut (first connecting part) 29 Locking pin (first connecting part) 29a Flange 30 Nut (second connecting part) 31 Contact part 31a Flat plate 32 Support part 32a Flat plate 33 Notch part 34 Fixing hole 35 Bolt with head 36 Insertion hole 37 Bolt with head 38 Lift fixing means 39 Fixing fitting for accessories 40 Fixing table 40a Top plate part 40b Side plate part 40c Inclined plate part 40d Foot plate piece 40e Protrusion 41 Clamping fitting 42 Bolt 43 Pressing fitting 44 Pole member 45a, 45b Arm parts 46 Tongue piece 47 Fixing pin 48 Detachable pin 48a Pin hole 49 Actuating bolt 50 Locking means 50a Receiving part 50b Protrusion 51 Reference member 52 Support member 53 Connecting and fixing means

Claims

1. A method for constructing a suspended scaffold, in which a stage suspended by cables is constructed, and the stage is sequentially extended and added while being extended from the leading side to the trailing side, The stage is composed of a main beam (1a) and a secondary beam (1b) formed by arranging beam members (1) suspended by cables in parallel on the leading side (X1) and the trailing side (X2), and a grid (G) formed by connecting the main beam (1a) and the secondary beam (1b) at intervals in the parallel direction by girder members (4), and a floor board (2) laid on the grid, When constructing a trailing stage (S2) with respect to a previously constructed leading stage (S1), the trailing side girder member (4) provided on the trailing stage, With the first connecting portion (26) provided near the tail end of the girder member (4) connected to the main beam (1a) of the trailing stage, the second connecting portion (27) provided near the tip is faced downward of a reference member (51) suspended by a cable, Thereafter, by lift fixing means (38) provided between the reference member (51) and the second connecting portion (27), the second connecting portion (27) is pulled up to a predetermined height position toward the reference member (51) and fixed to the reference member (51). A method for constructing a suspended scaffold, characterized in that it is configured as such.

2. The method for constructing a suspended scaffold according to claim 1, characterized in that the reference member (51) is composed of a secondary beam (1b) suspended by a cable.

3. The reference member (51) is composed of a support member (52) suspended by a cable, and after fixing the second connecting portion (27) of the girder member (4) by the lift fixing means (38), the secondary beam (1b) is fixed to the support member (52). A method for constructing a suspended scaffold according to claim 1, characterized in that it is configured as such.

4. In the method for constructing a suspended scaffold according to claim 1, 2 or 3, The lift fixing means (38) is composed of an insertion hole (36) penetrating vertically through the reference member (51), a headed bolt (37) inserted into the insertion hole from above, and a nut (30) provided on the second connecting portion (27). With the second connecting part (27) facing downward of the reference member (51), the headed bolt (37) inserted into the insertion hole (36) is screwed into the nut (30), and after pulling up the nut (30) by rotating the headed bolt (37), it is configured to be fixed by fastening. A construction device for a suspension scaffold, characterized in that it is configured in this way.

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