Method and device for constructing suspended scaffold

Abstract

To provide a method and a device for constructing a suspended scaffold.SOLUTION: In a method of constructing suspended scaffolds in which stages suspended from existing structures by cable ropes are added in sequence, extending from a leading side to a trailing side, one end of a minor beam (2) is pivotally connected by using a master beam of a preceding stage (S1) constructed earlier as a main beam (1a), and a parallelogram folding grid (Gp) is formed by pivotally connecting the master beam (1) constituting a sub-beam (1b) of a following stage to the other end of the minor beam (2). Thereafter, in a state in which a quadrangular grid (G) with each apex angle being a right angle is formed by unfolding the folding grid through rotation of the pivotal connection portions at both ends of the minor beam (2), the grid (G) is fixed so as not to be rotatable by installing horizontal members (3) so as to intersect between the main beam (1a) and the sub-beam (1b), and a floor plate (4) is laid on the grid.SELECTED DRAWING: Figure 29

Description

Technical Field

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

Background Art

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

[0003] The suspended scaffold is constructed by building a stage suspended by a cable such as a chain on the existing structure, and sequentially adding extensions while extending the stage 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 suspended 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 it so that it can be constructed with as easy work as possible.

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

Means for Solving the Problems

[0008] Therefore, the construction method of the suspension 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 front side to the rear side. The stage is formed by arranging a plurality of cross beams in series in the width direction perpendicular to the extension direction, and arranging the main beams and secondary beams by arranging the main beams and secondary beams in parallel on the front side and the rear side. A floor board is laid on the grid formed by connecting the cross beams to each other with sub-beams between the main beam and the secondary beam. For the previously constructed front stage, the subsequently constructed rear stage uses the secondary beam in the front stage as the main beam of the rear stage, and pivotally connects one end of the sub-beam to the cross beam of the main beam constituting the main beam, and pivotally connects the cross beam of the main beam constituting the secondary beam of the rear stage to the other end of the sub-beam to form a folding grid of a parallelogram. Then, by expanding the folding grid through the rotation of the pivotal connection parts at both ends of the sub-beam, a grid of a quadrilateral with each apex angle being a right angle is formed, and a cross member is erected across the cross beams constituting the main beam and the secondary beam to fix the grid immovably, and a floor board is laid on the grid.

[0009] Preferably, after constructing a reference stage on the ground or on a high-altitude working device, the reference stage is suspended on the structure with a cable, and the suspended reference stage is used as the front stage, and the subsequent stages are sequentially constructed.

[0010] At that time, the floor board is laid on the grid with the cross member as a joist.

[0011] And, the construction device of the suspension scaffold of the present invention is configured as means, and a plurality of cross beams constituting the main beam and the secondary beam project receiving fittings on both the leading side and the trailing side with respect to the extending direction, and the receiving fittings are provided with a groove-shaped fitting portion and a locking hole formed at the bottom of the groove. The cross member is provided with fitting fittings at both ends, and a locking pin projects downward from the fitting fittings. When the locking pin of the fitting fitting on the cross member is inserted and locked into the locking hole of the receiving fitting on the cross beam, the fitting fitting fits into the fitting portion of the receiving fitting, so that the cross member and the cross beam are configured to be non-rotatably connected to each other.

Advantages of the Invention

[0012] According to the present invention, in a method of constructing a suspension scaffold by forming a secondary beam 1b by a parent beam for a subsequent stage S2 from a main beam 1a via a child beam 2 by a parent beam included in a preceding stage S1, forming a grid between the main beam 1a and the secondary beam 1b, and laying a floor board on the grid, a parallelogram folding grid Gp is formed at a position close to the preceding stage S1, and then, by expanding this toward the subsequent side X2, a square grid G with each apex angle being a right angle is formed, so that there is an advantage that an operator can work safely from above the preceding stage S1. In particular, regarding the configuration in which the cross member 3 is installed to fix the expanded grid G, since the operator can insert the cross member 3 from the preceding stage S1 toward the subsequent side X2 so as to enable the installation, there is an effect that the work is safe, simple, and easy.

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 extending and adding subsequent stages 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.

[0016] The stage S constructed first on the leading side X1 is composed of a reference stage S1 constructed on the ground or on a device such as an elevated work platform. After construction, the reference stage S1 is suspended by a cable C such as a chain to an existing structure, and then, with 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 the main beam 1 extending in the width direction Y in parallel with the leading side X1 and the trailing side X2 to form a main beam 1a and a secondary beam 1b, and connecting the main beam 1 to each other with secondary beams 2 between the main beam 1a and the secondary beam 1b to form a grid G, and laying a floor board 4 on the grid G on which the horizontal member 3 is installed.

[0018] Therefore, regarding the relationship between the preceding stage and the subsequent stage, the main beam 1a and the secondary beam 1b constituted by a pair of parent beams 1 in the preceding stage S1 are such that when constructing the subsequent stage S2, the secondary beam 1b of the preceding stage S1 is also used as the main beam 1a of the subsequent stage S2. Therefore, by disposing one parent beam 1 on the subsequent side X2, the secondary beam 1b is constituted, and a grid G for the stage S2 is constructed between the main beam 1a and the secondary beam 1b.

[0019] 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 constituted by one reference beam 6 and two extension beams 7 disposed on both sides thereof.

[0020] For this reason, the grid G formed between the main beam 1a and the secondary beam 1b represents three compartments formed by a total of four secondary beams 2, namely, two secondary beams 2 disposed at both ends of the reference beam 6 and two secondary beams 2 disposed 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 secondary beams 2 may be arbitrarily selected, and thereby the number of compartments included in the grid G may be changed.

[0021] (Reference beam of parent beam) FIGS. 2 and 3 show the reference beam 6. The reference beam 6 is constituted by a beam body 8 formed of 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 projects receiving fittings 11 on both the preceding side and the subsequent side, and the details of the receiving fittings 11 will be described later.

[0022] The multi-connection bracket 10 includes an upper bracket 10a and a lower bracket 10b disposed above and below the short column 9, and is provided with tongue-shaped secondary beam connection portions 12 protruding to the preceding side X1 and the subsequent side X2, and tongue-shaped cross beam connection portions 13 protruding in the width direction Y.

[0023] At approximately the center of the upper bracket 10, a suspension portion 14 suspended by a cable C such as a chain is configured. In the illustrated embodiment, by fixing a nut below the insertion hole, the bolt portion of the connecting fitting 15 provided on the cable C is configured to be screwed.

[0024] (Extension beam of the main 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. In addition, receiving fittings 11 project from both the front side and the rear side of the beam body 16. Since the receiving fittings 11 have the same configuration as the receiving fittings 11 of the reference beam 6, they are denoted by the same reference numerals.

[0025] 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 to the front side X1 and the rear side X2, and a tongue-shaped cross-beam connection portion 13 protruding in the width direction Y. Further, the suspension portion 14 provided at approximately the center of the upper bracket 10a is also configured in the same manner as the suspension portion 14 of the reference beam 6.

[0026] The series connection bracket 18 provided on the extension beam 6 is for connecting 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 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.

[0027] In addition, the connection method between the reference beam 6 and the extension beam 6 will be described later.

[0028] (Sub-beam) Figures 6 and 7 show the secondary beam 2. The secondary beam 2 is composed of a beam body 19 formed by an angle pipe or the like, and a connecting bracket 21 is provided via short columns 20 made of pipe fixed to both ends of the beam body 19.

[0029] When connecting the pair of main beams 1 that make up the main beam 1a and the secondary beam 1b with the secondary beam 2 as described above, the connecting bracket 21 of the secondary beam 2 is connected to the secondary beam connecting portion 12 of the multi-connecting bracket 10 of the reference beam 6 and the extension beam 7 that make up the main beam 1. Therefore, corresponding to the upper bracket 10a and the lower bracket 10b of the multi-connecting bracket 10, the connecting bracket 21 of the secondary beam 2 also includes an upper bracket 21a and a lower bracket 21b.

[0030] Incidentally, the method of connecting the secondary beam 2 to the reference beam 6 and the extension beam 6 will be described later.

[0031] (Horizontal member) Figures 8 and 9 show the horizontal member 3. The horizontal member 3 is composed of a crosspiece member 22 formed by an angle 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.

[0032] As described above, in a state where the grid G is formed by connecting the main beam 1 that makes up the main beam 1a and the secondary beam 1b with the secondary beam 2, between the reference beam 6 and the extension beam 7 that make up the main beam 1, the grid G is fixed by installing the horizontal member 3 via the receiving fitting 11 and the fitting fitting 23. Incidentally, the fitting method of the receiving fitting 11 and the fitting fitting 23 will be described later.

[0033] (Grid for stage) Figure 10 shows the arrangement of the members for constructing one grid G that forms one stage S.

[0034] A pair of parent beams 1 and 1 that form the main beam 1a and the secondary beam 1b are formed by arranging 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.

[0035] A total of four sub-beams 2 are arranged and connected facing both ends of the reference beam 6 and the ends of the extension beam 7. At that 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 the connection method will be described later.

[0036] A total of nine cross members 3 are arranged and connected between the main beam 1a and the secondary beam 1b 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. Details of the connection structure and the connection method will be described later.

[0037] The grid G formed thereby has three cells g defined by the sub-beams 2. As shown in FIG. 1, three floor boards 4 are laid per cell g to form the stage S.

[0038] (Method of constructing a suspension 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.

[0039] (Step of arranging the parent 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 also used as the main beam 1a in the subsequent stage S2. Therefore, by arranging one main beam 1 on the subsequent side X2, the secondary beam 1b with respect to the main beam 1a is formed.

[0040] However, for arranging the main 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 previously connect the reference beam 6 and the extension beam 7 in series to complete the main beam 1 and then the operator can connect it to the secondary beam 2 while supporting the main beam 1, there is no problem. However, since it becomes a considerably heavy object, the operation of directly connecting it to the secondary beam 2 in the air is not easy.

[0041] 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 main beam 1, which facilitates the operation.

[0042] 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 regarding such a connection device are shown in FIGS. 16 to 23.

[0043] 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.

[0044] Throughout all embodiments, the connection device is composed of a connection fitting and a connected fitting. The connection fitting is composed of a series connection bracket 18 in the extension beam 7 (hereinafter, this is referred to as "connection fitting 18"). The connected fitting is composed of a cross beam connection part 13 of the multi-connection bracket 10 in the reference beam 6 (hereinafter, this is referred to as "connected fitting 13").

[0045] Therefore, the connecting fitting 18 and the fitting to be connected 13 form a pivotal connection means 27 that is rotatably connected in a temporarily placed state by placing the other fitting with a pivotal support hole 26 for inserting the pivotal support pin 25 on one fitting with the upward pivotal support pin 25 fixed thereto.

[0046] And when the reference beam 6 and the extension beam 7 are arranged in series through the rotation, screw means 28 for making the connecting fitting 18 and the fitting to be connected 13 connectable is provided, whereby fixing means 29 that is fixed immovably is constituted.

[0047] The connecting fitting 18 constitutes a connecting upper plate and a connecting lower plate by an upper bracket 18a and a lower bracket 18b arranged vertically (hereinafter, referred to as "connecting upper plate 18a" and "connecting lower plate 18b", respectively). Further, the fitting to be connected 13 includes a to-be-connected upper plate 13a and a to-be-connected lower plate 13b arranged vertically. And at the time of connection, it is configured to be connected by overlapping the connecting upper plate 18a and the connecting lower plate 18b on the to-be-connected upper plate 13a and the to-be-connected lower plate 13b, respectively.

[0048] At this time, the connecting lower plate 18b and the to-be-connected lower plate 13b form a pivotal connection means 27 that is rotatably connected by inserting an upward pivotal support pin 25 fixed to the to-be-connected lower plate 13b into a pivotal support hole 26 opened in the connecting lower plate 18b. And when the reference beam 6 and the extension beam 7 are arranged in series with each other, the connecting upper plate 18a and the to-be-connected upper plate 13a form fixing means 29 that is fixed immovably by fixing the connecting upper plate 18a and the to-be-connected upper plate 13a via screw means 28.

[0049] (First Embodiment) FIGS. 16 and 17 show a first embodiment of the above connecting device.

[0050] The connecting lower plate 18b and the to-be-connected lower plate 13b form a first pivotal connection means 27a that is rotatably connected by inserting an upward pivotal support pin 25a fixed to the to-be-connected lower plate 13b into a pivotal support hole 26a opened in the connecting lower plate 18b.

[0051] In contrast, the connecting upper plate 18a and the upper plate 13a to be connected are provided with a female screw hole 28a by a nut on the upper plate 13a to be connected coaxially with the pivot pin 25a. With the insertion hole 26b formed in the connecting upper plate 18a aligned with the female screw hole 28a, a bolt 25b that screws into the female screw hole 28a is provided through the insertion hole 26b. Therefore, if the bolt 25b is screwed in in a loose state without being tightly fastened to the female screw hole 28a, a second pivoting means 27b is formed in which the bolt 25b connects the connecting upper plate 18a and the upper plate 13a to be connected rotatably as a pivot.

[0052] Then, with the reference beam 6 and the extension beam 7 arranged in series with each other, by strongly screwing the bolt 25b into the female screw hole 28a to fasten the connecting upper plate 18a to the upper plate 13a to be connected, a fixing means 29 for fixing non-rotatably is constituted.

[0053] 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 upper plate 13a to be connected and the lower plate 13b to be connected, and in the temporarily placed state, the first pivoting means 27a and the second pivoting means 27b are formed, and the reference beam 6 and the extension beam 7 are pivotally connected rotatably. Therefore, in the rotatable pivoting state, the posture can be changed so that the reference beam 6 and the extension beam 7 are arranged in series on a straight line, and the work is easy.

[0054] Then, as shown in Fig. 17(B), when the bolt 25b is strongly screwed into the female screw hole 28a with the reference beam 6 and the extension beam 7 arranged in series on a straight line, the connecting upper plate 18a is fastened to the upper plate 13a to be connected and fixed non-rotatably, so the work is simple and easy.

[0055] (Second Embodiment) Figs. 18 and 19 show a second embodiment of the above connecting device.

[0056] 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.

[0057] 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 both plates 18a and 13a will not be hindered.

[0058] 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 fixing the connecting upper plate 18a to the upper plate 13a to be connected and making it non-rotatable is formed.

[0059] (Third Embodiment) Figs. 20 and 21 show a third embodiment of the above connecting device.

[0060] 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.

[0061] 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. Therefore, when the second pivot pin 25d is inserted into the second pivot hole 26d, a second pivoting means 27b is formed that rotatably connects the connecting upper plate 18a and the upper plate 13a to be connected.

[0062] 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 has a tongue piece 18d extending in the tip direction, and the insertion hole 29a is formed in the tongue piece 18d.

[0063] As a result, 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. Therefore, a bolt 29c prepared separately is screwed into the female screw hole 29b, and the tongue piece 18d is fastened and joined to the upper bracket 10a, thereby forming a fixing means 29 that fixes them to be non-rotatable relative to each other.

[0064] 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. As a result, by screwing the bolt portion of the connection fitting 15 provided on the cable C into the suspension portion 14, a suspendable configuration is achieved.

[0065] (Fourth Embodiment) FIGS. 22 and 23 show a fourth embodiment of the above connection device.

[0066] The connecting lower plate 18b and the connected lower plate 13b constitute a first pivoting means 27a for rotatable connection by inserting an upward pivoting pin 25a fixed to the connected lower plate 13b 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.

[0067] The connecting upper plate 18a and the connected upper plate 13a constitute a second pivoting means 27b for rotatable connection by inserting an upward second pivoting pin 25d fixed to the connected upper plate 13a 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.

[0068] In the case of the fourth embodiment, the connecting upper plate 18a and the connected upper plate 13a form fixing 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 connected upper plate 13a are rotated via the second pivoting means 27b and the reference beam 6 and the extension beam 7 are arranged in series, the fixing plate portions 30, 31 are configured to overlap.

[0069] Therefore, insertion holes 29d and female screw holes 29e that can be mutually aligned are provided in the overlapping fixing plate portions 30, 31, respectively. A separately prepared bolt 29f is screwed into the female screw hole 29d, and the fixing plate portions 30, 31 are fastened and joined to constitute a fixing means 29 that fixes them so as not to be rotatable relative to each other.

[0070] (Grid formation process) When the reference beam 6 and the extension beam 7 are fixed in series by the above-described 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. Between the main beam 1a and the secondary beam 1b, a folding grid Gp is formed that represents a form folded into a parallelogram as shown in the figure.

[0071] Since the connection bracket 21 of the sub-beam 2 is pivotally connected to the multi-connection brackets 10 of the reference beam 6 and the extension beam 7 in a rotatable manner, the folding grid Gp is unfolded by rotating the sub-beam 2 toward the subsequent side X2, as shown in FIGS. 13 and 24, to form a grid G in the shape of a quadrilateral with each apex angle being a right angle.

[0072] FIGS. 24 to 26 show the pivotal connection structure of such a connection bracket 21 and the multi-connection bracket 10.

[0073] As shown in FIG. 25(A), the distance H1 between the upper bracket 10a and the lower bracket 10b of the multi-connection 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 connection bracket 21.

[0074] When the upper and lower brackets 21a, 21b of the connection bracket 21 are inserted between the sub-beam connection portions 12, 12 of the upper and lower brackets 10a, 10b of the multi-connection bracket 10, the pivotal connection holes 32 formed in each are configured to penetrate and communicate in the vertical direction, and a pivotal connection pin 33 to be inserted into the pivotal connection holes 32 is prepared.

[0075] 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 connection portions 12, 12 of the multi-connection bracket 10 to the connection brackets 21, 21 and inserting the pivotal connection pin 33 into the pivotal connection holes 32 from above.

[0076] The pivotal connection pin 33 includes a shaft portion 33a having a length that penetrates all the pivotal connection 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.

[0077] 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.

[0078] As a result, as shown in FIGS. 13 and 24, the folding grid Gp can be unfolded so as to become a rectangular grid G. The unfolding operation is performed by the operator reaching his hand from above the preceding stage S1 and rotating the secondary beam 2 toward the subsequent side X2.

[0079] (Grid fixing step) The grid G formed on the subsequent side X2 of the preceding stage S1 has each corner portion pivotally connected by a pivot pin 33 as described above and is unstable. Therefore, as shown in FIG. 14, the 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 intersecting 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.

[0080] 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.

[0081] 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 projectingly provided 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 therein and a locking hole 35 formed at the bottom of the groove.

[0082] 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 and the extension beam 7 and the transverse member 3 are configured to be connected and fixed to each other in a non-rotatable manner.

[0083] 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. A pair of receiving fittings 11, 11 are arranged on both sides sandwiching the beam bodies 8, 16 of the reference beam 6 and the extension beam 7, that is, on the leading side X1 and the trailing side X2, with the mounting plates 36, 36 facing each other and fixed by mounting bolts 37.

[0084] As a result, 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. Therefore, the transverse member 3 can be suitably installed therebetween.

[0085] 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, simple and easy operation.

[0086] (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.

[0087] The bed board 4 is laid in a safely supported state with the horizontal cross member 3 as the joist. In the case of the illustrated embodiment, as shown in FIG. 30, for each grid g of the grid G, in addition to the central horizontal cross member 3a, both side horizontal cross members 3b, 3b that are close to and along the secondary beam 2 are arranged. Thereby, the rectangular bed board 4 has its short side along the secondary beam 2 and its long side mounted on the three horizontal cross members, so it fits well and can be laid in a stable state.

Explanation of Signs

[0088] X Extension direction X1 Leading side X2 Following side Y Width direction S Stage C Cable G Grid Gp Folding grid g Grid square 1 Main beam 1a Main girder 1b Secondary girder 2 Secondary beam 3 Horizontal cross member 4 Bed board 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 Secondary 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 Connecting bracket 21a Upper bracket 21b Lower bracket 22 Cross member 23 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 part 32 Pivoting hole 33 Pivoting pin 33a Shaft part 33b Head part 34 Fitting part 35 Locking hole 36 Mounting plate 37 Mounting bolt

Claims

1. A method for constructing a suspended scaffold, which constructs a stage suspended by cables on an existing structure and successively adds and constructs the stage while extending it from the front side to the rear side. The stage (S) is constructed by laying a floor board (4) on a grid (G) formed by connecting cross beams (5) in series in the width direction (Y) orthogonal to the extension direction (X) to form a main beam (1) and arranging the main beam in parallel with the front side (X1) and the rear side (X2). The main beam and the secondary beam are connected to each other by cross beams (5, 5) with sub-beams (2). For the previously constructed front stage (S1), the subsequently constructed rear stage (S2) uses the secondary beam (1b) in the front stage as the main beam (1a) of the rear stage. One end of the sub-beam (2) is pivotally connected to the cross beam (5) of the main beam (1a), and the other end of the sub-beam (2) is pivotally connected to the cross beam (5) of the main beam (1) that constitutes the secondary beam (1b) of the rear stage, thereby forming a folding grid (Gp) in the shape of a parallelogram. Thereafter, by expanding the folding grid through the rotation of the pivotal connection parts at both ends of the sub-beam (2) to form a grid (G) in the shape of a quadrilateral with each vertex angle being a right angle, a cross member (3) is installed across the cross beams (5, 5) that constitute the main beam (1a) and the secondary beam (1b) to fix the grid (G) so that it cannot rotate, and a floor board (4) is laid on the grid. This is a method for constructing a suspended scaffold.

2. After constructing a reference stage on the ground or on a high-altitude working device, the reference stage is suspended on the structure with cables, and the suspended reference stage is used as the front stage, and successively, the rear stage is constructed. This is the method for constructing a suspended scaffold according to Claim 1.

3. The method for constructing a suspended scaffold according to Claim 1 or 2, characterized in that a floor board is laid on the grid with the cross member as a joist.

4. In the method for constructing a suspended scaffold according to Claim 1 or 2, The plurality of cross beams (5) that constitute the main beam (1a) and the secondary beam (1b) project receiving fittings (11) on both the front side and the rear side with respect to the extension direction (X). The receiving fitting (11) is provided with a groove-shaped fitting portion (34) and a locking hole (35) formed at the bottom of the groove. The horizontal cross member (3) is provided with fitting metal fittings (23) at both ends, and a locking pin (24) projects downward from the fitting metal fittings. When the locking pin (24) of the fitting metal fitting (23) on the horizontal cross member (3) is inserted and locked into the locking hole (35) of the receiving metal fitting (11) on the cross beam (5), the fitting metal fitting (23) fits into the fitting portion (34) of the receiving metal fitting, thereby connecting the horizontal cross member (3) and the cross beam (5) to be non-rotatable relative to each other. The construction device of the suspension scaffold is characterized by this structure.

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