Suspended scaffold

Abstract

To provide a suspended scaffold provided with a connecting device for safely and easily performing connection work when forming a master beam by serially connecting and arranging a plurality of transverse beams.SOLUTION: In a suspended scaffold formed by laying floor boards (4) on a grid (G) formed by connecting a main beam (1a) and a sub-beam (1b), constituted by a master beam (1), to each other by a minor beam (2), a plurality of cross beams (5) constituting the master beam (1) are respectively provided, at mutually facing end portions, with a connecting fitting (18) and a connected fitting (13). Both fittings (18) and (13) constitute pivotally connecting means (27) for rotatably connecting the fittings by mounting the other fitting having a pivot hole (26) for inserting an upward pivot pin (25) onto one fitting having the pivot pin fixed thereto, and also constitute fixing means (29) for non-rotatably fixing both fittings (18) and (13) by screw means in a state where a plurality of cross beams are arranged in series.SELECTED DRAWING: Figure 17

Description

Technical Field

[0001] The present invention relates to a suspension scaffold, and more particularly to a suspension scaffold provided with a connecting device that facilitates and secures the connection work when forming a main beam by connecting a plurality of cross beams in series.

Background Art

[0002] Conventionally, when constructing or renovating elevated structures such as highways and bridges, a suspension scaffold extending along the existing structure has been constructed at high altitudes.

[0003] The suspension scaffold is constructed by building a stage suspended by a cable such as a chain on the existing structure, and sequentially adding stages while extending the stage from the front side to the rear 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] Preferably, the stage is constructed by arranging a main beam and a secondary beam in parallel with the front side and the rear side, forming a grid by connecting the main beam and the secondary beam with cross beams, and laying a floor board on the grid.

[0007] At this time, it is preferable that the main beam is configured to be formed by connecting a plurality of cross beams (for example, a reference beam and an extension beam) in series.

[0008] Regarding this point, since the work of connecting a plurality of cross beams at an elevated stage is dangerous, it is desirable to provide a connecting device that enables connection with as easy a work as possible.

[0009] An object of the present invention is to provide a suspended scaffold that can meet such needs, and particularly, when forming a parent beam by connecting a plurality of cross beams in series, a suspended scaffold provided with a connecting device that makes the connecting work safe and easy.

Means for Solving the Problems

[0010] Therefore, the first means configured by the present invention is a suspended scaffold formed by laying a floor board on a grid suspended by a cable on an existing structure. The grid is formed into a rectangular frame by a parent beam connecting a plurality of cross beams in series and a child beam connecting the juxtaposed parent beams. Each of the plurality of cross beams is provided with a connecting fitting and a connected fitting at opposite ends. The connecting fitting and the connected fitting are provided with a pivotal connection means for rotatably connecting by inserting a pivotal support pin provided on one fitting into a pivotal support hole when the other fitting is placed on one fitting, and in a state where a plurality of cross beams are arranged in series, a fixing means for fixing the connecting fitting and the connected fitting so as not to rotate.

[0011] Further, the second means configured by the present invention is a suspension scaffold constructed by constructing a stage suspended by a cable 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 arranging main beams and secondary beams by arranging main girders in parallel on the leading side and the trailing side, where the main girders are formed by connecting a plurality of cross beams in series in the width direction orthogonal to the extending direction. A floor board is laid on a grid formed by connecting cross beams to each other with sub-beams between the main beam and the secondary beam. In this configuration, a plurality of cross beams constituting the main girder are provided with a connecting fitting and a connected fitting at their mutually facing ends, respectively. The connecting fitting and the connected fitting constitute a pivot connection means that is rotatably connected by placing the other fitting having a pivot hole for inserting the pivot pin on one fitting having an upwardly fixed pivot pin, and in a state where a plurality of cross beams are arranged in series, a fixing means that is fixed immovably is constituted by screw means for connecting the connecting fitting and the connected fitting.

[0012] The connecting fitting preferably includes a connecting upper plate and a connecting lower plate arranged vertically, and the connected fitting preferably includes a connected upper plate and a connected lower plate arranged vertically, and is configured to be connected by overlapping the connecting upper plate and the connecting lower plate on the connected upper plate and the connected lower plate, respectively.

[0013] (Inclusive) Furthermore, the connecting lower plate and the connected lower plate constitute the pivot connection means that is rotatably connected by inserting an upwardly fixed pivot pin provided on the connected lower plate into a pivot hole opened in the connecting lower plate, and the connecting upper plate and the connected upper plate preferably constitute the fixing means that is fixed immovably by fixing the connecting upper plate and the connected upper plate via screw means when a plurality of cross beams are arranged in series with each other.

[0014] In an embodiment of the present invention, the connecting lower plate and the connected lower plate are rotatably connected by inserting an upward pivot pin fixed to the connected lower plate into a pivot hole opened in the connecting lower plate, thereby constituting a first pivot connecting means. The connecting upper plate and the connected upper plate are rotatably connected by aligning an insertion hole opened in the connecting upper plate with a female screw hole provided in the connected upper plate coaxially with the pivot pin and screwing a bolt into the female screw hole from the insertion hole, thereby constituting a second pivot connecting means with the bolt as a pivot. In a state where cross beams are arranged in series with each other, a fixing means for non-rotatably fixing is constituted by screwing the bolt into the female screw hole and fastening the connecting upper plate to the connected upper plate.

[0015] In another embodiment of the present invention, the connecting lower plate and the connected lower plate are rotatably connected by inserting an upward pivot pin fixed to the connected lower plate into a pivot hole opened in the connecting lower plate, thereby constituting a first pivot connecting means. The connecting upper plate and the connected upper plate are rotatably connected by inserting an upward bolt fixed to the connected upper plate into a receiving hole opened in the connecting upper plate coaxially with the pivot pin, thereby constituting a second pivot connecting means. In a state where cross beams are arranged in series with each other, a fixing means for non-rotatably fixing is constituted by screwing a nut onto the bolt and fastening the connecting upper plate to the connected upper plate.

[0016] In still another embodiment of the present invention, the connecting lower plate and the connected lower plate are rotatably connected by inserting an upward first pivot pin fixed to the connected lower plate into a first pivot hole opened in the connecting lower plate, thereby constituting a first pivot connecting means. The connecting upper plate and the connected upper plate are rotatably connected by inserting an upward second pivot pin fixed to the connected upper plate into a second pivot hole opened in the connecting upper plate coaxially with the first pivot pin, thereby constituting a second pivot connecting means. When cross beams are arranged in series with each other on the circumference of the pivot pin, insertion holes and female screw holes that are aligned with each other are provided in the connecting upper plate and the connected upper plate respectively, and a fixing means for non-rotatably fixing is constituted by screwing a bolt from the insertion hole into the female screw hole and fastening the connecting upper plate to the connected upper plate.

Effects of the Invention

[0017] According to the present invention, the main beam 1a and the secondary beam 1b of the grid G are formed by the main beam 1, and a plurality of cross beams 5 (reference beam 6 and extension beam 7) are used as components and assembled at a high stage. Therefore, the materials carried into the stage from the ground are not the completed large main beams but the components before assembly, so the carrying-in work is easy.

[0018] On the other hand, when assembling the main beam 1, it is not easy to arrange a plurality of cross beams 5 in series. In particular, it is difficult to pivotally connect to the secondary beam 2 and fix them in series while facing the cross beams 5 (reference beam 6 and extension beam 7) to the secondary beam 2 extending from the preceding stage S1 toward the subsequent side X2.

[0019] Regarding this point, according to the present invention, the connecting fitting 18 and the connected fitting 13 provided on the connecting cross beam 5 (reference beam 6 and extension beam 7) are provided with a pivoting means 27 and a fixing means 29. Therefore, when the connecting fitting 18 is placed on the connected fitting 13, they are pivotally connected to each other so that the posture adjustment in the series direction can be easily performed, and when they are in a series posture through rotation, they can be immediately fixed by the fixing means 29.

Brief Description of the Drawings

[0020]

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Embodiments for Carrying Out the Invention

[0021] The preferred embodiments of the present invention will be described in detail based on the following drawings.

[0022] (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 to 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 that time, if necessary, the subsequent stage may be extended in the width direction Y orthogonal to the extension direction X from the leading stage.

[0023] 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 pulling it up with 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.

[0024] The stage S is constructed by arranging the main beam 1a and the secondary beam 1b in parallel with the leading side X1 and the trailing side X2 by arranging the parent beam 1 extending in the width direction Y, forming a grid G by connecting the parent beam 1 to each other with the child beam 2 between the main beam 1a and the secondary beam 1b, and laying a floor board 4 on the grid G on which the transverse member 3 is installed.

[0025] Therefore, regarding the relationship between the leading stage and the subsequent stage, the main beam 1a and the secondary beam 1b constituted by a pair of parent beams 1 in the leading stage S1 are made to also serve as the main beam 1a of the subsequent stage S2 when constructing the subsequent stage S2. Therefore, the secondary beam 1b is constituted by arranging one parent beam 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.

[0026] Incidentally, the parent beam 1 is formed by connecting a plurality of cross beams 5 in series in the width direction Y. In the case of the illustrated embodiment, the cross beam 5 is composed of one reference beam 6 and two extension beams 7 arranged on both sides thereof.

[0027] Therefore, the grid G formed between the main beam 1a and the secondary beam 1b represents three compartments defined by a total of four sub - beams 2, namely, two sub - beams 2 arranged at both ends of the reference beam 6 and two sub - beams 2 arranged at the ends of the left and right extension beams 7. However, the number of cross beams 5 (reference beam 6 and extension beams 7) constituting the parent beam 1 and the number of sub - beams 2 can be arbitrarily selected, and thereby the number of compartments included in the grid G may be changed.

[0028] (Reference beam of the parent beam) Figs. 2 and 3 show the reference beam 6. The reference beam 6 is composed of a beam body 8 formed by an angle pipe or the like, and a multi - connection bracket 10 is provided via pipe - made short columns 9 fixed to both ends of the beam body 8. Incidentally, the beam body 8 has receiving fittings 11 protruding on both the leading side and the trailing side, and the details of the receiving fittings 11 will be described later.

[0029] The multi - connection bracket 10 includes an upper bracket 10a and a lower bracket 10b arranged above and below the short column 9, and is provided with a tongue - shaped sub - beam connection portion 12 protruding to the leading side X1 and the trailing side X2, and a tongue - shaped cross - beam connection portion 13 protruding in the width direction Y.

[0030] A suspension portion 14 suspended by a cable C such as a chain is formed substantially at the center of the upper bracket 10. In the case of the illustrated embodiment, by fixing a nut below the insertion hole, the bolt portion of the connection fitting 15 provided on the cable C is screwed.

[0031] (Extension beam of the parent beam) Figures 4 and 5 show the extension beam 6. The extension beam 6 is composed of a beam body 16 formed by a square pipe or the like. Short columns 17 made of pipe are fixedly provided at both ends of the beam body 16. A multi-connection bracket 10 is provided on the short column 17 at one end, and a series connection bracket 18 is provided on the short column 17 at the other end. Incidentally, the beam body 16 has receiving brackets 11 protruding on both the leading side and the trailing side. Since the receiving brackets 11 are of the same configuration as the receiving brackets 11 of the reference beam 6, they are denoted by the same reference numerals.

[0032] As shown in the figure, since the multi-connection bracket 10 of the extension beam 6 has the same configuration as the multi-connection bracket 10 of the reference beam 6, it is denoted by the same reference numeral. It includes an upper bracket 10a and a lower bracket 10b arranged above and below the short column 17, a tongue-shaped sub-beam connection portion 12 protruding toward the leading side X1 and the trailing side X2, and a tongue-shaped cross-beam connection portion 13 protruding in the width direction Y. Further, a suspension portion 14 provided at substantially the center of the upper bracket 10a is also configured in the same manner as the suspension portion 14 of the reference beam 6.

[0033] The series connection bracket 18 provided on the extension beam 6 is for connecting and arranging the extension beams 6 in series on both sides of the reference beam 6. Therefore, it includes an upper bracket 18a and a lower bracket 18b that are connected to the cross-beam connection portions 13 of the upper bracket 10a and the lower bracket 10b in the multi-connection bracket 10 of the reference beam 6.

[0034] Incidentally, the connection method between the reference beam 6 and the extension beam 6 will be described later.

[0035] (Sub-beam) Figures 6 and 7 show the sub-beam 2. The sub-beam 2 is composed of a beam body 19 formed by a square pipe or the like. Connection brackets 21 are provided via short columns 20 made of pipe fixedly provided at both ends of the beam body 19.

[0036] When connecting a pair of parent beams 1 constituting the main beam 1a and the secondary beam 1b to the child beam 2 as described above, the connection bracket 21 of the child beam 2 is connected to the child beam connection part 12 of the multi-connection bracket 10 of the reference beam 6 and the extension beam 7 constituting the parent beam 1. Therefore, corresponding to the upper bracket 10a and the lower bracket 10b of the multi-connection bracket 10, the connection bracket 21 of the child beam 2 also includes an upper bracket 21a and a lower bracket 21b.

[0037] Incidentally, the method of connecting the child beam 2 to the reference beam 6 and the extension beam 6 will be described later.

[0038] (Cross member) Figures 8 and 9 show the cross member 3. The cross member 3 is composed of a crosspiece member 22 formed by a square pipe or the like, fitting fittings 23 are provided at both ends of the crosspiece member 22, and locking pins 24 protruding downward from the fitting fittings 23 are provided.

[0039] As described above, in a state where the grid G is formed by connecting the parent beam 1 constituting the main beam 1a and the secondary beam 1b with the child beam 2, between the reference beam 6 and the extension beam 7 constituting the parent beam 1, the cross member 3 is installed via the receiving fitting 11 and the fitting fitting 23, thereby fixing the grid G. Incidentally, the fitting method of the receiving fitting 11 and the fitting fitting 23 will be described later.

[0040] (Grid for stage) Figure 10 shows the arrangement of members for forming one grid G constituting one stage S.

[0041] A pair of parent beams 1, 1 constituting the main beam 1a and the secondary beam 1b are formed by connecting a plurality of cross beams 5 (reference beam 6 and extension beam 7) in series. In the case of the illustrated embodiment, one reference beam 6 and two extension beams 7 are used as the cross beams 5, and the extension beams 7, 7 are connected in series on both sides of the reference beam 6. At that time, the series connection brackets 18 of the extension beam 7 are connected to the multi-connection brackets 10 at both ends of the reference beam 6. Details of the connection structure and the connection method will be described later.

[0042] Four sub - beams 2 are arranged and connected facing both ends of the reference beam 6 and the end of the extension beam 7. At this time, the connection brackets 21 of the sub - beams 2 are connected to the multi - connection brackets 10 of the reference beam 6 and the extension beam 7. Details of the connection structure and connection method will be described later.

[0043] Nine cross - frame members 3 are arranged and connected corresponding to three receiving fittings 11 arranged in the longitudinal direction of the reference beam 6 and three receiving fittings 11 arranged in the longitudinal direction of each of the pair of extension beams 7, 7 between the main beam 1a and the secondary beam 1b. Details of the connection structure and connection method will be described later.

[0044] The grid G formed thereby has three grids g defined by the sub - beams 2 in the case of the illustrated embodiment. As shown in FIG. 1, three floor boards 4 are laid per grid g to form the stage S.

[0045] (Method for constructing a suspended scaffold) FIGS. 11 to 15 show the steps when constructing the subsequent stage S2 in the extension direction X from the reference stage S1 (hereinafter referred to as the "preceding stage S1") toward the subsequent side X2 from the preceding side X1.

[0046] (Step of arranging the main beam) As described above, when constructing the subsequent stage S2 following the preceding stage S1, the secondary beam 1b in the preceding stage S1 is made to also serve as the main beam 1a of the subsequent stage S2. For this reason, by arranging one main beam 1 on the subsequent side X2, the secondary beam 1b with respect to the main beam 1a is formed.

[0047] However, for arranging the parent beam 1 for forming the secondary beam 1b, the operator has to lean out into the space on the subsequent side X2 and perform operations above the preceding stage S1. Therefore, above the preceding stage S1, if it is possible to complete the parent beam 1 by connecting the reference beam 6 and the extension beam 7 in series in advance and then connect the parent beam 1 to the secondary beam 2 while the operator supports the parent beam 1, there will be no problem. However, since it is a relatively heavy object, it is not easy to connect it to the secondary beam 2 in the air all at once.

[0048] Therefore, as shown in FIG. 11, each of the reference beam 6 and the extension beam 7 is individually connected to the secondary beam 2 and supported by the main beam 1a. From this state, as shown in FIG. 12, it is better to connect the reference beam 6 and the extension beam 7 in series to form the parent beam 1, which makes the operation easier.

[0049] However, in that case, it is desirable that the connection device be configured such that the connection operation for connecting the reference beam 6 and the extension beam 7 in series can be easily performed. Embodiments of the present invention enabling this are shown in FIGS. 16 to 23.

[0050] Regarding the connection device, FIGS. 16 and 17 show the first embodiment, FIGS. 18 and 19 show the second embodiment, FIGS. 20 and 21 show the third embodiment, and FIGS. 22 and 23 show the fourth embodiment.

[0051] Throughout all embodiments, the connection device is composed of a connecting fitting and a connected fitting. The connecting fitting is composed of a series connection bracket 18 in the extension beam 7 (hereinafter, this is referred to as "connecting fitting 18"). The connected fitting is composed of a cross beam connection portion 13 of the multi-connection bracket 10 in the reference beam 6 (hereinafter, this is referred to as "connected fitting 13").

[0052] Therefore, the connecting fitting 18 and the connected fitting 13 constitute a pivotal connection means 27 that is pivotally connected in a rotatable manner in a temporarily placed state by placing the other fitting having a pivotal support hole 26 for inserting the pivotal support pin 25 on one fitting having the upwardly fixed pivotal support pin 25.

[0053] When the reference beam 6 and the extension beam 7 are arranged in series through the rotation, screw means 28 is provided to enable connection between the connecting fitting 18 and the connected fitting 13, thereby constituting fixing means 29 that is fixed immovably.

[0054] The connecting fitting 18 is composed of an upper connecting plate and a lower connecting plate formed by an upper bracket 18a and a lower bracket 18b arranged vertically (hereinafter referred to as "upper connecting plate 18a" and "lower connecting plate 18b" respectively). The connected fitting 13 includes an upper connected plate 13a and a lower connected plate 13b arranged vertically. And during connection, the upper connecting plate 18a and the lower connecting plate 18b are configured to be connected by overlapping them on the upper connected plate 13a and the lower connected plate 13b respectively.

[0055] At this time, the lower connecting plate 18b and the lower connected plate 13b constitute pivotal connection means 27 that are pivotally connected by inserting an upward pivotal support pin 25 fixed to the lower connected plate 13b into a pivotal support hole 26 opened in the lower connecting plate 18b. And when the reference beam 6 and the extension beam 7 are arranged in series with each other, the upper connecting plate 18a and the upper connected plate 13a constitute fixing means 29 that is fixed immovably by fixing the upper connecting plate 18a and the upper connected plate 13a via screw means 28.

[0056] (First Embodiment) Figs. 16 and 17 show the first embodiment of the above connecting device.

[0057] The lower connecting plate 18b and the lower connected plate 13b constitute first pivotal connection means 27a that are pivotally connected by inserting an upward pivotal support pin 25a fixed to the lower connected plate 13b into a pivotal support hole 26a opened in the lower connecting plate 18b.

[0058] In contrast, the connecting upper plate 18a and the connected upper plate 13a are coaxially arranged with the pivot pin 25a. A female screw hole 28a is provided in the connected upper plate 13a by a nut, and a bolt 25b that screws into the female screw hole 28a from the insertion hole 26b is provided in a state where the insertion hole 26b opened in the connecting upper plate 18a is aligned with the female screw hole 28a. Therefore, if the bolt 25b is screwed in in a loosened state without being strongly fastened to the female screw hole 28a, a second pivot connecting means 27b that rotatably connects the connecting upper plate 18a and the connected upper plate 13a with the bolt 25b as a pivot is configured.

[0059] Then, in a state where the reference beam 6 and the extension beam 7 are arranged in series with each other, the bolt 25b is strongly screwed into the female screw hole 28a to fasten the connecting upper plate 18a to the connected upper plate 13a, thereby constituting a fixing means 29 for fixing the rotation immovably.

[0060] According to this first embodiment, as shown in FIG. 17(A), the connecting upper plate 18a and the connecting lower plate 18b are overlapped and placed on the connected upper plate 13a and the connected lower plate 13b, and the first pivot connecting means 27a and the second pivot connecting means 27b are formed in a temporarily placed state, and the reference beam 6 and the extension beam 7 are rotatably pivotally connected. Therefore, in a rotatable pivot state, the posture of the reference beam 6 and the extension beam 7 can be changed so that they are arranged in series on a straight line, and the work is easy.

[0061] Then, as shown in FIG. 17(B), in a state where the reference beam 6 and the extension beam 7 are arranged in series on a straight line, if the bolt 25b is strongly screwed into the female screw hole 28a, the connecting upper plate 18a is fastened to the connected upper plate 13a and fixed so as not to rotate, so the work is simple and easy.

[0062] (Second Embodiment) FIGS. 18 and 19 show a second embodiment of the above connecting device.

[0063] The connecting lower plate 18b and the lower plate 13b to be connected form a first pivoting means 27a for rotatable connection by inserting an upward pivoting pin 25a fixed to the lower plate 13b to be connected into a pivoting hole 26a formed in the connecting lower plate 18b. This is the same as the configuration of the first embodiment described above.

[0064] On the other hand, an upward bolt 25c is fixed to the upper plate 13a to be connected coaxially with the pivoting pin 25a between the connecting upper plate 18a and the upper plate 13a to be connected, and a receiving hole 26c for inserting the bolt 25c is formed in the connecting upper plate 18a. Therefore, when the bolt 25c is inserted into the receiving hole 26c, a second pivoting means 27b for rotatably connecting the connecting upper plate 18a and the upper plate 13a to be connected is formed. A nut 28b is screwed onto the upper end of the bolt 25c inserted through the receiving hole 26c, but if it is loosened without being tightly fastened, the rotation of the two plates 18a and 13a will not be hindered.

[0065] Therefore, when the reference beam 6 and the extension beam 7 are arranged in series with each other, in that state, when the nut 28b is tightly screwed onto the bolt 25c, a fixing means 29 for fastening the connecting upper plate 18a to the upper plate 13a to be connected and fixing it so as not to rotate is formed.

[0066] (Third Embodiment) Figs. 20 and 21 show a third embodiment of the above connecting device.

[0067] The connecting lower plate 18b and the lower plate 13b to be connected form a first pivoting means 27a for rotatable connection by inserting an upward pivoting pin 25a fixed to the lower plate 13b to be connected into a pivoting hole 26a formed in the connecting lower plate 18b. This is the same as the configuration of the first and second embodiments described above.

[0068] On the other hand, an upward second pivoting pin 25d is fixed to the upper plate 13a to be connected coaxially with the first pivoting pin 25a between the connecting upper plate 18a and the upper plate 13a to be connected, and a second pivoting hole 26d for inserting the pivoting pin 25d is formed in the connecting upper plate 18a. Accordingly, when the second pivot pin 25d is inserted into the second pivot hole 26d, a second pivoting means 27b is configured to rotatably connect the connecting upper plate 18a and the upper plate 13a to be connected.

[0069] In the case of the third embodiment, when the reference beam 6 and the extension beam 7 are arranged in series on the circumference of the pivot pin (the first pivot pin 25a and the second pivot pin 25d arranged coaxially), insertion holes 29a and female screw holes 29b that can be aligned with each other are provided in the connecting upper plate 18a and the upper plate 13a to be connected, respectively. In the illustrated example, the female screw hole 29b is formed by fixing a nut to the upper bracket 10a of the multi-connection bracket 10 that constitutes the upper plate 13a to be connected. The connecting upper plate 18a is provided with a tongue piece 18d extending in the tip direction, and the insertion hole 29a is formed in the tongue piece 18d.

[0070] Thereby, when the reference beam 6 and the extension beam 7 are arranged in series, the tongue piece 18d faces the center of the upper bracket 10a, and the insertion hole 29a is aligned with the female screw hole 29b. Thus, a fixing means 29 is configured to fix them to be non-rotatable with respect to each other by screwing a separately prepared bolt 29c into the female screw hole 29b and fastening and connecting the tongue piece 18d to the upper bracket 10a.

[0071] In addition, in the case of the third embodiment, as shown in FIGS. 20(A) and 21(B), a suspension portion 14 is formed by providing an insertion hole and a nut in the connecting upper plate 18a formed by the upper bracket of the series connection bracket 18. Thereby, a configuration is provided such that the bolt portion of the connection fitting 15 provided on the cable C can be screwed into the suspension portion 14 for suspension.

[0072] (Fourth Embodiment) FIGS. 22 and 23 show a fourth embodiment of the above-described connection device.

[0073] The connecting lower plate 18b and the lower plate 13b to be connected form a first pivoting means 27a for rotatable connection by inserting an upward pivoting pin 25a fixed to the lower plate 13b to be connected into a pivoting hole 26a formed in the connecting lower plate 18b. This is the same as the configuration of the first to third embodiments described above.

[0074] The connecting upper plate 18a and the upper plate 13a to be connected form a second pivoting means 27b for rotatable connection by inserting an upward second pivoting pin 25d fixed to the upper plate 13a to be connected and coaxial with the first pivoting pin 25a into a second pivoting hole 26d formed in the connecting upper plate 18a. This is also the same as the configuration of the first to third embodiments described above.

[0075] In the case of the fourth embodiment, the connecting upper plate 18a and the upper plate 13a to be connected form fixed plate portions 30, 31 by widening the plate width toward the sides of the second pivoting hole 26d and the second pivoting pin 25d, respectively. Therefore, when the connecting upper plate 18a and the upper plate 13a to be connected are rotated via the second pivoting means 27b and the reference beam 6 and the extension beam 7 are arranged in series, the fixed plate portions 30, 31 are configured to overlap.

[0076] Therefore, insertion holes 29d and female screw holes 29e that match each other are provided in the overlapping fixed plate portions 30, 31, respectively. A separately prepared bolt 29f is screwed into the female screw hole 29d, and the fixed plate portions 30, 31 are fastened and joined to form a fixing means 29 that fixes them so as not to be rotatable relative to each other.

[0077] (Grid formation process) When the reference beam 6 and the extension beam 7 are fixed in series by the above connecting device, as shown in FIG. 12, a secondary beam 1b is formed by a parent beam 1 connected via an inclined sub-beam 2 to the main beam 1a formed by the preceding stage S1, and a folding grid Gp is formed between the main beam 1a and the secondary beam 1b, which represents a form folded into a parallelogram as shown in the figure.

[0078] Since the connecting bracket 21 of the sub-beam 2 is pivotally connected to the multi-connecting brackets 10 of the reference beam 6 and the extension beam 7 in a rotatable manner, the folding grid Gp can be deployed as shown in FIGS. 13 and 24 by rotating the sub-beam 2 toward the subsequent side X2, forming a grid G in the shape of a quadrilateral with each apex angle being a right angle.

[0079] FIGS. 24 to 26 show the pivotal connection structure of such a connecting bracket 21 and the multi-connecting bracket 10.

[0080] As shown in FIG. 25(A), the distance H1 between the upper bracket 10a and the lower bracket 10b of the multi-connecting bracket 10 is formed such that H1≧H2 with respect to the overall height H2 (the distance between the upper surface and the lower surface of the upper and lower brackets) of the upper bracket 21a and the lower bracket 21b of the connecting bracket 21.

[0081] Then, when the upper and lower brackets 21a, 21b of the connecting bracket 21 are fitted between the sub-beam connecting portions 12, 12 of the upper and lower brackets 10a, 10b of the multi-connecting bracket 10, the pivot holes 32 formed in each are configured to penetrate and communicate in the vertical direction, and a pivot pin 33 to be inserted into the pivot holes 32 is prepared.

[0082] Thereby, the connection of the reference beam 6 and the extension beam 7 to the sub-beam 2 can be easily pivotally connected by externally fitting the sub-beam connecting portions 12, 12 of the multi-connecting bracket 10 to the connecting brackets 21, 21 and inserting the pivot pin 33 into the pivot holes 32 from above.

[0083] The pivot pin 33 includes a shaft portion 33a having a length that penetrates all the pivot holes 32 in the vertical direction and a head portion 33b. In the case of the illustrated embodiment, the head portion 33b is fixed to the upper end of the shaft portion 33a so as to be T-shaped.

[0084] Therefore, it is sufficient for the operator to drop and insert the pivot pin 33 from above into the pivot hole 32. The dropped pivot pin 33 pivotally supports both brackets 10 and 21 in a rotatable manner with the head 33b abutting and resting on the upper bracket 10a of the multi-connection bracket 10.

[0085] Thereby, as shown in FIGS. 13 and 24, the folding grid Gp can be expanded so as to be a rectangular grid G. The expansion operation is performed by the operator reaching a hand from above the preceding stage S1 and rotating the secondary beam 2 toward the subsequent side X2.

[0086] (Grid fixing step) The grid G formed on the subsequent side X2 of the preceding stage S1 is unstable because each corner portion is pivotally connected by a pivot pin 33 as described above. Therefore, as shown in FIG. 14, cross members 3 are installed between the main beams 1a and the secondary beams 1b that constitute the parent beam 1, that is, between the reference beams 6 and between the extension beams 7. At this time, the cross member 3 is installed to intersect the reference beam 6 and the extension beam 7 and is configured to fix the installation location in a non-rotatable manner, whereby the grid G can be fixed in a non-rotatable manner.

[0087] FIGS. 27 and 28 show details of the receiving fitting 11 provided on the reference beam 6 and the extension beam 7 and the fitting fitting 23 of the cross member 3.

[0088] As described above, the cross member 3 is provided with fitting fittings 23 at both ends of a crosspiece member 22 formed of a square pipe or the like, and a locking pin 24 is protruded below the fitting fitting 23. On the other hand, the receiving fitting 11 is provided with a groove-shaped fitting portion 34 that allows the fitting fitting 23 to be inserted and a locking hole 35 formed at the bottom of the groove.

[0089] Therefore, when the locking pin 24 of the fitting 23 on the transverse member 3 is inserted into and locked with the locking hole 35 of the receiving fitting 11 of the reference beam 6 and the extension beam 7, the fitting 23 fits into the fitting portion 34 of the receiving fitting 11, so that the reference beam 6, the extension beam 7 and the transverse member 3 are configured to be connected and fixed to each other so as not to be rotatable.

[0090] In the case of the illustrated embodiment, as shown in FIG. 28, the receiving fitting 11 has a fitting portion 34 provided with a locking hole 35 fixed to the mounting plate 36, and a pair of receiving fittings 11, 11 sandwich the beam bodies 8, 16 of the reference beam 6 and the extension beam 7 on both sides, that is, on the leading side X1 and the trailing side X2, and the mounting plates 36, 36 are arranged back to back and fixed by the mounting bolts 37.

[0091] Thereby, the reference beam 6 and the extension beam 7 always form a relationship in which the respective receiving fittings 11 are arranged opposite to each other between the main beam 1a arranged on the leading side X1 and the secondary beam 1b arranged on the trailing side X2, so that the transverse member 3 can be suitably installed therebetween.

[0092] And the installation of the transverse member 3, as shown in FIG. 29, the operator extends the transverse member 3 from the leading stage S1 toward the trailing side X2, fits and locks the fitting 23 on the tip side to the receiving fitting 11 of the secondary beam 1b, and then fits and locks the fitting 23 on the hand side to the receiving fitting 11 of the main beam 1a, and it can be carried out by a safe and simple operation.

[0093] (Floor board laying process) Thereafter, by laying the floor board 4 on the grid G, as shown in FIG. 15, the subsequent stage S2 is completed. Thereafter, by repeating the same process, subsequent stages S3, S4 are added in the extension direction X.

[0094] The floorboard 4 is laid in a safely supported state with the horizontal framing member 3 as the joist. In the case of the illustrated embodiment, as shown in FIG. 30, for each cell g of the grid G, in addition to the central horizontal framing member 3a, the horizontal framing members 3b, 3b on both sides that are close to and along the secondary beam 2 are arranged. Thereby, the rectangular floorboard 4 has its short side along the secondary beam 2 and its long side mounted on the three horizontal framing members, so it fits well and can be laid in a stable state.

[0095] (Summary) As described above, regarding the suspended scaffold of the present invention, the specific configuration of the construction members has been described together with the construction method. Of course, the present invention is not limited to the illustrated embodiment. In short, the present invention is characterized in that, regarding the main beam 1 for forming the framework of the grid G that constitutes the suspended scaffold, it is composed of a plurality of cross beams 5 to facilitate transportation to the site. And regarding the configuration of the connecting fitting 18 and the connected fitting 13 for connecting the cross beams 5 in series, by placing one fitting on the other in a pre-placed state and making it rotatable by the pivoting means 27 with the pivot pin 25 and the pivot hole 26, it facilitates the adjustment of the posture of the connected cross beams 5 in the series direction. In the serially arranged state, by fixing both fittings 18, 13 immovably by the fixing means 29, the main beam 1 can be formed.

Explanation of Reference Numerals

[0096] X Extension direction X1 Leading side X2 Following side Y Width direction S Stage C Cable G Grid Gp Folding grid g Cell 1 Main beam 1a Main girder 1b Secondary girder 2 Secondary beam 3 Horizontal framing member 4 Floorboard 5 Cross beam 6 Reference beam 7 Extension beam 8 Beam body 9 Short column 10 Multi-connection bracket 10a Upper bracket 10b Lower bracket 11 Receiving fitting 12 Sub-beam connection part 13 Cross-beam connection part (connected fitting) 13a Connected upper plate 13b Connected lower plate 14 Suspension part 15 Connection fitting 16 Beam body 17 Short column 18 Series connection bracket (connection fitting) 18a Upper bracket (connection upper plate) 18b Lower bracket (connection lower plate) 18d Tongue piece 19 Beam body 20 Short column 21 Connection bracket 21a Upper bracket 21b Lower bracket 22 Cross member 23 Insertion fitting 24 Locking pin 25 Pivot pin 25a Pivot pin 25b Bolt 25c Bolt 25d Second pivot pin 26 Pivot hole 26a Pivot hole 26b Insertion hole 26c Receiving hole 26d Second pivot hole 27 Pivoting means 27a First pivoting means 27b Second pivoting means 28 Screwing means 28a Female screw hole 28b Nut 29 Fixing means 29a Insertion hole 29b Female screw hole 29c Bolt 29d Insertion hole 29e female screw hole 29f bolt 30, 31 fixed plate parts 32 pivot hole 33 pivot pin 33a shaft part 33b head part 34 fitting part 35 locking hole 36 mounting plate 37 mounting bolt

Claims

1. A suspended scaffold formed by laying a floor board (4) on a grid (G) suspended by a cable on an existing structure, wherein the grid (G) is formed into a rectangular frame by a main beam (1) connecting a plurality of cross beams (5) in series and a secondary beam (2) connecting the juxtaposed main beams (1). The plurality of cross beams (5) are respectively provided with a connecting fitting (18) and a connected fitting (13) at opposite ends thereof. The connecting fitting (18) and the connected fitting (13) are provided with a pivotal connection means (27) for rotatably connecting them by inserting a pivotal support pin (25) provided on one fitting into a pivotal support hole (26) when the other fitting is placed on one fitting. A suspended scaffold, characterized in that it comprises a fixing means (29) for fixing the connecting fitting (18) and the connected fitting (13) immovably in a state where a plurality of cross beams are arranged in series.

2. A suspended scaffold constructed by constructing a stage suspended by a cable on an existing structure and sequentially adding extensions while extending the stage from the leading side to the trailing side, wherein the stage (S) is constructed by laying a floor board (4) on a grid (G) formed by arranging a main beam (1a) and a secondary beam (1b) in parallel by arranging a plurality of cross beams (5) in series in the width direction (Y) orthogonal to the extending direction, and connecting the cross beams (5) to each other with secondary beams (2) between the main beam and the secondary beam. The plurality of cross beams (5) constituting the main beam (1) are respectively provided with a connecting fitting (18) and a connected fitting (13) at opposite ends thereof. The connecting fitting (18) and the connected fitting (13) constitute a pivotal connection means (27) for rotatably connecting them by placing the other fitting provided with a pivotal support hole (26) for inserting the pivotal support pin on the one fitting having the upward pivotal support pin (25) fixed thereto. A suspended scaffold, characterized in that it comprises a fixing means (29) for immovably fixing the connecting fitting (18) and the connected fitting (13) by screw means for coupling them in a state where a plurality of cross beams are arranged in series.

3. The connecting fitting (18) includes a connecting upper plate (18a) and a connecting lower plate (18b) arranged vertically, and the fitting to be connected (13) includes a fitting upper plate (13a) and a fitting lower plate (13b) arranged vertically. The hanging scaffold according to claim 1 or 2 is characterized in that they are configured to be connected by overlapping the connecting upper plate and the connecting lower plate on the fitting upper plate and the fitting lower plate, respectively.

4. The connecting lower plate (18b) and the fitting lower plate (13b) constitute a pivotal connecting means (27a) that is pivotally connected by inserting an upward pivotal pin (25a) fixed to the fitting lower plate into a pivotal hole (26a) opened in the connecting lower plate. The connecting upper plate (18a) and the fitting upper plate (13a) constitute a fixing means (29) that is fixedly and non-rotatably fixed by fixing the connecting upper plate and the fitting upper plate via screw means when the cross beams (5) are arranged in series with each other. The hanging scaffold according to claim 3 is characterized by this.

5. The connecting lower plate (18b) and the fitting lower plate (13b) constitute a first pivotal connecting means (27a) that is pivotally connected by inserting an upward pivotal pin (25a) fixed to the fitting lower plate into a pivotal hole (26a) opened in the connecting lower plate. The connecting upper plate (18a) and the fitting upper plate (13a) constitute a second pivotal connecting means (27b) that is pivotally connected with the bolt as a pivot by screwing a bolt (25b) from an insertion hole (26b) opened in the connecting upper plate into a female screw hole (28a) provided in the fitting upper plate on the same axis as the pivotal pin (25a) with the insertion hole and the female screw hole aligned. The hanging scaffold according to claim 3 is characterized in that in a state where the cross beams (5) are arranged in series with each other, the bolt (25b) is screwed into the female screw hole (28a) to fasten the connecting upper plate to the fitting upper plate, thereby constituting a fixing means (29) that is fixedly and non-rotatably fixed.

6. The connecting lower plate (18b) and the fitting lower plate (13b) constitute a first pivotal connecting means (27a) that is pivotally connected by inserting an upward pivotal pin (25a) fixed to the fitting lower plate into a pivotal hole (26a) opened in the connecting lower plate. The connecting upper plate (18a) and the upper plate to be connected (13a) form a second pivot connecting step (27b) that is rotatably connected by inserting an upward bolt (25c) fixed to the upper plate to be connected into a receiving hole (26c) formed in the connecting upper plate coaxially with the pivot pin (25a). In a state where cross beams (5) are arranged in series with each other, a fixing means (29) that is fixedly immovable is formed by screwing a nut (28b) onto the bolt (25c) and fastening the connecting upper plate to the upper plate to be connected. The hanging scaffold according to claim 3, characterized in that it is configured in this way.

7. The connecting lower plate (18b) and the lower plate to be connected (13b) form a first pivot connecting means (27a) that is rotatably connected by inserting an upward first pivot pin (25a) fixed to the lower plate to be connected into a first pivot hole (26a) formed in the connecting lower plate. The connecting upper plate (18a) and the upper plate to be connected (13a) form a second pivot connecting means (27b) by inserting an upward second pivot pin (25d) fixed to the upper plate to be connected into a second pivot hole (26d) formed in the connecting upper plate coaxially with the first pivot pin (25a). On the circumferences of the pivot pins (25a, 25d)), when cross beams (5) are arranged in series with each other, insertion holes (29a)(29d) and female screw holes (29b)(29e) that are aligned with each other are provided in the connecting upper plate (18a) and the upper plate to be connected (13a) respectively. A fixing means (29) that is fixedly immovable is formed by screwing bolts (29c)(29f) from the insertion holes into the female screw holes and fastening the connecting upper plate to the upper plate to be connected. The hanging scaffold according to claim 3, characterized in that it is configured in this way.

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