Method and device for constructing suspended scaffolding

Abstract

To provide a suspended scaffold construction method capable of reducing the number of cables for suspending a scaffold board, and a device for construction.SOLUTION: A suspended scaffold construction method includes a preparation step of attaching and fixing a beam member (13) to a preceding main scaffold board (M). The method further includes a unit formation method including: an adjacent step of making the main scaffold board and a succeeding sub scaffold board adjacent to each other in a manner of being suspended by a cable (9); a bonding step of bonding using joint means (6); and a support step of supporting the sub scaffold board (S) by a support part (13b) of the beam member. The method further includes a unit connection method of arraying units by repeating the unit formation method and bonding the joint means (6) in between the preceding and succeeding units. The method further includes a step of detaching and removing the cable (9) from the sub scaffold board (S) while suspending the main scaffold board (M) by the cable (9) among the scaffold boards in the unit.SELECTED DRAWING: Figure 14

Description

[Technical field]

[0001] The present invention relates to a method for constructing a suspended scaffold and to an apparatus for carrying out said method. [Background technology]

[0002] 2. Description of the Related Art Conventionally, when constructing or repairing elevated structures such as expressways and bridges, or other existing structures at high altitudes, a suspended scaffold is constructed to extend along the existing structure.

[0003] A suspended scaffolding board (hereinafter simply referred to as a "scaffolding board") for constructing a suspended scaffolding is generally configured as shown in FIGS. 1 to 3.

[0004] The scaffolding board 1 is configured to support a rectangular floor material 2 using a first girder side frame 3A and a second girder side frame 3B (sometimes simply referred to as "girder side frames 3" when the two are not distinguished) made of square pipe materials or the like arranged parallel to one another at a distance from each other, and a first girder side frame 4A and a second girder side frame 4B (sometimes simply referred to as "gable side frames 4" when the two are not distinguished) made of circular pipe materials are erected on both ends 3a, 3b of a pair of girder side frames 3A, 3B that protrude from both side edges of the floor material 2.

[0005] Furthermore, a center frame 5 made of a circular pipe material is disposed below the center of the width of the floor material 2, and both ends 5a, 5a are fixed to the end frame 4 by welding or the like to connect them.

[0006] When multiple scaffolding boards are lined up in sequence, the leading scaffolding board 1 and the trailing scaffolding board 1 are arranged so that the sides of the girder side frames 3A, 3B are adjacent to each other and connected by joint means 6 provided on the end frames 4A, 4B. Note that the joint means 6 may also be provided on the girder side frames 3A, 3B, and in short, the scaffolding boards 1, 1 adjacent to each other in the line-up direction are configured to be connected to each other.

[0007] In the example shown in the figure, the end frame 4 is configured so that both ends do not protrude from the outer surfaces of the first girder side frame 3A and the second girder side frame 3B, and one of the ends is opened onto the outer surface of the first girder side frame 3A to form a socket 6a, and a member inserted into the other end is made to protrude outward beyond the outer surface of the second girder side frame 3B to form a plug 6b, and a joint means 6 is formed by inserting the plug 6b into the socket 6a between the end frames 4, 4 of adjacent scaffolding boards 1, 1 to connect them.

[0008] At this time, the socket 6a and the plug 6b which are fitted together are held in place by inserting the connecting pin 7 through the socket 6a and the plug 6b.

[0009] However, as typified by expressways, the extension direction of an elevated structure is not necessarily limited to a straight line, but also includes a curved line. Therefore, the suspended scaffolding must also be constructed in a direction corresponding to this. For this reason, the joint means 6 is configured so that the socket 6a can be slidably inserted into the plug 6b. The insertion hole of the plug 6b into which the connecting pin 7 is inserted is formed by a long hole 8, and the plug 6b and the socket 6a are allowed to slide within the range of the long hole 8, so that the distance between adjacent scaffolding boards 1, 1 can be adjusted.

[0010] In the illustrated example, the connecting pin 7 is tethered to a rope such as a chain to prevent loss, and the rope is fastened to a bracket 7a fixed to the ends 3a, 3a of the first girder side frame 3A.

[0011] When constructing a suspended scaffold, the scaffold boards 1 are lined up along an existing structure by alternately connecting the sockets 6a and plugs 6b, and are suspended from the underside of the existing structure by means of ropes 9 such as chains. To enable such suspension by means of ropes 9 such as chains, the floor material 2 has window holes 10 at predetermined intervals facing the center frame 5, and the frame 5 is provided with annular suspension fittings 11 facing each window hole 10. Therefore, by connecting the ropes 9 to the suspension fittings 11, the frame 5 is suspended via the fittings 11.

[0012] Although not shown, a rope 9 such as a chain is hung by folding back one rope at the bottom end to form two parallel ropes, and the folded back portion is inserted into the hanging metal fitting 11 to suspend the metal fitting 11. Therefore, the rope 9 is also used to suspend the end 5a of the center frame 5 by winding the folded back portion around the end 5a, as shown in the figure. [Prior art documents] [Patent documents]

[0013] [Patent Document 1] Patent No. 6366472 [Patent Document 2] Patent No. 6426917 [Patent Document 3] Patent No. 6663726 Summary of the Invention [Problem to be solved by the invention]

[0014] The numerous scaffolding boards lined up to construct the suspended scaffolding are all suspended by a plurality of ropes 9.

[0015] As described above, the adjacent leading and trailing scaffolding boards are connected by the joint means 6, but the joint means 6 is for connecting the two scaffolding boards so that the distance between them can be adjusted, and does not form a rigid structure that supports each other's load. Therefore, each scaffolding board needs to be suspended by multiple ropes 9, and if the ropes are removed from a scaffolding board, the scaffolding board may fall, which is extremely dangerous.

[0016] For this reason, a large number of cables 9 will be stretched out in a forest-like pattern on the floor surface of the constructed suspended scaffolding.

[0017] By the way, the suspended scaffolding is configured such that the floor surface constructed by the previously installed scaffolding boards is expanded by sequentially transporting additional scaffolding boards to a predetermined position and adding subsequent scaffolding boards.

[0018] However, in a situation where a large number of cables are strung across the structure as described above, when transporting long, large scaffolding planks, it is necessary to avoid interference with the cables, which makes the transportation work complicated and requires a lot of effort and time.

[0019] Another problem is that the large number of ropes hinder smooth movement of workers not only when transporting scaffolding boards, but also when workers move around on the floor.

[0020] Therefore, the present invention relates to the ropes that are stretched out in a forest-like manner on the floor surface of a suspended scaffolding, and has discovered that it is possible to configure the ropes so that they can be detached and removed from the scaffolding boards that are lined up in a straight line at least in the suspended scaffolding structure.As a result, the objective of the present invention is to provide a method and apparatus for constructing a suspended scaffolding that solves the above-mentioned problem by reducing the number of ropes. [Means for solving the problem]

[0021] Therefore, the construction method of the suspended scaffold of the present invention is configured as a means for constructing a suspended scaffold by suspending a scaffold plate from an existing structure with a cable and lining up a number of scaffold plates in sequence in the extension direction of the existing structure, the scaffold plate is provided with a pair of girder side frames supporting a floor plate, a girder side frame erected on the girder side frames, and joint means for mutually joining adjacent scaffold plates in the lining direction, the preceding scaffold plate adjacent in the lining direction is a main scaffold plate, the following scaffold plate is a sub-scaffold plate, a beam member is attached and fixed to the underside of the main scaffold plate near the gable side, and a support portion extended from the beam member is positioned toward the underside of the sub-scaffold plate, and the main scaffold plate and the sub-scaffold plate that have undergone the preparation process are suspended by cables. The unit formation method comprises an adjoining step of aligning the girder side frames of both scaffolding boards side by side, a joining step of joining both scaffolding boards to each other using the joint means, and a supporting step of supporting the sub-scaffolding board on the support part of the beam member attached and fixed to the main scaffolding board, and comprises a unit connecting step of repeatedly carrying out the unit formation method to sequentially line up units and connect the sub-scaffolding board of the leading unit and the main scaffolding board of the trailing unit by joining the joint means between them, and a step of detaching and removing the cables from the sub-scaffolding board while the main scaffolding board is suspended by the cables among the scaffolding boards in the unit.

[0022] In addition, the device for constructing a suspended scaffold of the present invention is configured as a means for constructing the suspended scaffold Regarding scaffolding boards and beam members for constructing The scaffolding board has a center frame that extends parallel to the girder side frame. FloorboardsThe main scaffolding board is disposed below the gable side frame, and both ends of the center frame are fixedly connected to the gable side frame, with both ends of the gable side frame and both ends of the center frame facing the opening formed between both side edges of the floor board and the gable side frame.The beam member is integrally formed with a base that is attached and fixed to the underside of the main scaffolding board near the gable side, and a support portion extending from the base.The base is provided with an attachment means that is attached and fixed to at least one of the ends of the gable side frame and the center frame when inserted into the opening of the main scaffolding board from below.

[0023] In an embodiment of the present invention, the mounting means provided at the base of the beam member is composed of a hook fitting that engages with the upper surface of the end of the girder side frame when inserted from below into the opening of the main scaffolding board, and a fixing fitting that embraces the end of the center frame from all around.

[0024] The support portion of the beam member is provided with a support base that supports from below the end portion of the center frame of the sub-scaffolding board joined to the main scaffolding board via a joint means. Effect of the Invention

[0025] According to the present invention, it is possible to reduce the number of cables in the entire suspended scaffolding structure, thereby improving the environment in which a large number of cables were stretched across the floor surface in a forested manner as in the conventional technology. [Brief description of the drawings]

[0026] [Figure 1] FIG. 1 is a perspective view showing a scaffolding board in a conventional suspended scaffolding. [Diagram 2] FIG. 1 is a perspective view showing a conventional method for arranging scaffolding boards. [Diagram 3] FIG. 1 is a perspective view showing a portion of a suspended scaffold constructed by arranging conventional scaffolding boards in a row. [Figure 4] FIG. 2 is a perspective view showing a unit formed by a main scaffolding board and a sub-scaffolding board assembled to a beam member according to an embodiment of the present invention. [Diagram 5] FIG. 2 is a perspective view showing a beam member according to the first embodiment in a separated state from a main scaffolding board. [Figure 6] 13 is a perspective view showing the state when the base of the beam member is attached to the main scaffolding board. FIG. [Figure 7] This is an oblique view showing the state in which a hook fitting provided at the base of a beam member is engaged with the end of the girder side frame of the main scaffolding board. [Figure 8] This is an oblique view showing the state in which the preparation process is completed by fixing the fixing brackets provided at the base of the beam members to the ends of the center frames of the main scaffolding boards. [Figure 9] This is a perspective view showing a state in which, regarding a unit forming method, a sub-scaffolding board is placed adjacent to a main scaffolding board above the support part of the beam member, with the joint means facing each other. [Figure 10] 1 is a perspective view showing a state in which a sub-scaffolding board is joined to a main scaffolding board via a joint means and the sub-scaffolding board is supported on a support portion of a beam member, in relation to a unit forming method. FIG. [Figure 11] Regarding a method for constructing a suspended scaffolding according to one embodiment of the present invention, one cycle of a unit formation method for forming a unit using a main scaffolding board and a sub-scaffolding board to be assembled to a beam member is shown, in which (A) is an oblique view showing the state in which the main scaffolding to which the beam member has been attached and fixed in the preparation process is suspended by cables, (B) is an oblique view showing the adjacent process in which the subsequent sub-scaffolding board is placed adjacent to the main scaffolding board, and (C) is an oblique view showing the joining process in which the sub-scaffolding board is joined to the main scaffolding board by a joint means and the supporting process in which the sub-scaffolding board is supported on the supporting part of the beam member. [Figure 12]Regarding a method of constructing a suspended scaffolding, this shows a method in which the unit shown in Figure 11 is the leading side and the assembly method is repeated to line up units on the trailing side, where (A) is an oblique view showing the state in which the main scaffolding plank of the leading unit is suspended by a cable and a cable removal process has been carried out in which the cable is removed from the sub-scaffolding plank, (B) is an oblique view showing the state in which the main scaffolding plank for forming the trailing unit is placed adjacent to the sub-scaffolding plank of the leading unit in the unit connecting process, and (C) is an oblique view showing the state in which the unit connecting process has been completed by joining the joint means. [Figure 13] This is a perspective view showing a state in which a unit formation method is being carried out on the subsequent side from the state shown in FIG. 12(C) in relation to a method of constructing a suspended scaffolding. [Figure 14] This is an oblique view showing a state in which a unit is formed from two scaffolding boards, a main scaffolding board and a sub-scaffolding board, for a suspended scaffolding constructed by a method according to one embodiment of the present invention, and a cable removal process is carried out by detaching and removing the cables from the sub-scaffolding board for each unit. [Figure 15] FIG. 11 is a perspective view showing a second embodiment of a beam member used to carry out a method for constructing a suspended scaffolding according to another embodiment of the present invention. [Figure 16] This is an oblique view showing a state in which a unit is formed by attaching and fixing the base of a beam member to two main scaffolding boards arranged side by side and supporting one sub-scaffolding board on the support part of the beam member in the second embodiment, with a total of three scaffolding boards. [Figure 17] This is a perspective view of a suspended scaffold constructed by a method according to another embodiment of the present invention, showing the state in which the main scaffold plank located in the center of the three scaffold planks that form a unit is suspended by a rope, and the ropes have been detached and removed from the main scaffold plank and sub-scaffold plank located on either side of it, thereby carrying out a rope removal process. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] (How to build a suspended scaffold) Figures 4 to 14 show one embodiment of the method for constructing a suspended scaffold according to the present invention. In this case, the scaffold board 1 is the same as the scaffold board described above based on Figures 1 to 3, and the method for constructing a suspended scaffold is carried out by using such a scaffold board 1, and a large number of scaffold boards 1 are successively arranged in a row in the extension direction of an existing structure while being suspended by cables 9, thereby constructing a suspended scaffold.

[0029] As shown in Figures 4 to 10, the method of constructing a suspended scaffolding of the present invention involves a preparation step in which the leading scaffolding board 1a adjacent to each other in the row installation direction is designated as the main scaffolding board M, and the trailing scaffolding board 1b is designated as the sub-scaffolding board S, and the base 13a of a beam member 13 is attached and fixed to the underside of the gable side of the main scaffolding board M, and the support part 13b extended from the base 13a of the beam member 13 is positioned facing the underside of the sub-scaffolding board S.

[0030] Therefore, the leading main scaffolding board 1a (M) to which the beam member 13 has been attached and fixed through the preparation process, and the trailing sub-scaffolding board 1b (S) are suspended by ropes 9a, 9b, respectively, and a unit formation method is carried out to form a unit U in which the main scaffolding board 1a (M) and the sub-scaffolding board 1b (S) are assembled to the beam member 13, through the following steps: an adjoining step in which the girder side frames 3B, 3A of both scaffolding boards are aligned side by side, a joining step in which the opposing gable side frames 4 of both scaffolding boards are joined using the joint means 6, and a supporting step in which the sub-scaffolding board 1b (S) is supported on the support part 13b extended from the base 13a of the beam member 13 attached and fixed to the main scaffolding board 1a (M).

[0031] Then, by repeatedly carrying out the unit forming method, units U2, U3 to Un are lined up in sequence starting from the first unit U1. At this time, a unit connecting process is carried out in which the leading unit and the trailing unit are connected by joining the joint means 6 between the sub scaffolding board S of the leading unit and the main scaffolding board M of the trailing unit.

[0032] In the case of one embodiment shown in Figures 4 to 14, a first unit U1 is formed by two scaffolding boards, a main scaffolding board 1a (M) and a sub-scaffolding board 1b (S) on which the unit formation method has been carried out. As a result, the load of the sub-scaffolding board 1b (S) is supported by the support part 13b of the beam member 13 attached and fixed to the main scaffolding board 1a (M).

[0033] Incidentally, the second unit U2, which is arranged following the first unit U1, first undergoes a preparation process in which the main scaffolding plank 1c(M) to which the beam member 13 is attached and fixed is suspended by the ropes 9c, and is then joined to the sub-scaffolding plank 1b(S) of the first unit U1 by the joint means 6. Therefore, before the second unit U2 is formed, a unit connecting process is carried out.

[0034] Thereafter, the second unit U2 is formed by repeating the unit formation method. In other words, the adjoining step, the joining step, and the supporting step are carried out while the main scaffolding plank 1c (M) and the subsequent sub-scaffolding plank 1d (S) are suspended by the ropes 9c and 9d, respectively, to form the second unit U2, which is then lined up in a state of being connected to the first unit U1. Thereafter, the subsequent units U3 to Un are lined up in a similar manner.

[0035] Incidentally, the unit U is configured so that the sub-scaffolding board S is supported by the support portion 13b of the beam member 13 attached and fixed to the main scaffolding board M. Therefore, as long as the main scaffolding board M is suspended by the rope 9, even if the rope 9 is detached and removed from the sub-scaffolding board S, the sub-scaffolding board S will not fall because the load is supported by the beam member 13.

[0036] Therefore, when a unit U is formed, thereafter, only the main scaffolding plank M of the unit U is suspended by the rope 9, and a rope removal process is carried out in which the rope 9 that was suspending the sub-scaffolding plank S is detached and removed.

[0037] For example, in the first unit U1, even if the cable 9b is removed from the sub-scaffolding board 1b(S), the sub-scaffolding board 1b(S) is not likely to fall and is firmly supported. After that, the following units U2, U3 to Un are installed in a row after the unit connecting process, and the same cable removing process is carried out.

[0038] Incidentally, the timing of performing the cable removing step does not necessarily have to be immediately after the formation of the unit U, and it may be performed at any time after the formation of the unit U. For example, at the stage shown in FIG. 12(C), that is, when the main scaffolding plank 1c(M) for forming a new unit U2 on the trailing side is joined to the sub-scaffolding plank 1b(S) in the unit U1 formed on the leading side via the joint means 6 and the unit connecting step is performed, the cable removing step of removing and removing the cable 9 that has been suspending the sub-scaffolding plank 1bS in the leading unit U1 may be performed. In this case, the load of the sub-scaffolding plank 1b(S) from which the cable 9b has been removed and removed is supported by the support part 13b of the beam member 13 of the main scaffolding plank 1a(M) suspended by the cable 9a. The sub-scaffolding planks 1b (S) are each joined via joint means 6 to the main scaffolding plank 1a (M) suspended by ropes 9a on the leading side, and to the main scaffolding plank 1c (M) suspended by ropes 9c on the trailing side to form the second unit U2, thereby preventing positional shifts in the forward, backward, left and right directions, giving the worker a sense of security.

[0039] (First embodiment of beam member) 5 to 10 show a first embodiment of a beam member 13 used to carry out one embodiment of the construction method described above. The beam member 13 has a highly rigid frame structure formed by framing using square pipe materials or the like, and has a base portion 13a and a support portion 13b which are integrally formed in series.

[0040] With respect to the width dimension W determined by the spacing dimension of the outer surfaces of the girder side frames 3A, 3B of the scaffolding board 1, the length dimension L1 of the base 13a is formed so that L1≦W (preferably L1=W), and the length dimension L2 of the support portion 13b is formed so that L2≦W (preferably L2≒W).

[0041] The base 13a of the beam member 13 is configured to be attached and fixed to the underside of the gable side vicinity of the leading main scaffolding board 1a (M), and the support portion 13b is configured to extend toward the underside of the gable side vicinity of the trailing sub-scaffolding board 1b (S).

[0042] An attachment means 14 is fixed to the upper surface of the base 13a, and is attached and fixed by inserting it from below into an opening 12 formed on the gable side of the main scaffolding board 1a(M). The attachment means 14 is preferably composed of a first attachment means 14a attached and fixed to the end 3a of the girder side frame 3A arranged on the leading side of the main scaffolding board 1a(M), and a second attachment means 14b attached and fixed to the end 5a of the center frame 5, but may be composed of only one of the first attachment means 14a and the second attachment means 14b as long as it has a structure that allows for firm attachment and fixation. Alternatively, a third attachment means (not shown) may be further provided.

[0043] In the illustrated embodiment, the first attachment means 14a is configured with a hook fitting 15 that is inserted from below into an opening 12a formed between the end 3a of the girder side frame 3A arranged on the leading side of the main scaffolding board 1a(M) and the end 5a of the center frame 5, thereby engaging with the upper surface of the end 3a of the girder side frame 3A. In this case, it is preferable that the hook fitting 15 is configured to form a groove between itself and the upper surface of the base 13a, and to fit the end 3a into the groove.

[0044] In contrast, the second mounting means 14b is composed of a groove-shaped member 16a that embraces the end portion 5a of the center frame 5 from below, and a fixing bracket 16 consisting of a locking pin 16b that is removably inserted into the groove-shaped member 16a and that locks across the upper surface of the end portion 5a when inserted.

[0045] On one side, a support base 17 is fixed to the upper surface of the support portion 13b, which supports from below the end portion 5a of the center frame 5 of the trailing sub-scaffolding board 1b(S).

[0046] The preparatory process for attaching and fixing the beam member 13 in the first embodiment to the main scaffolding board 1a (M) is shown in Figures 5 to 8, and then, the unit formation method for forming the unit U1 by assembling the subsequent sub-scaffolding board 1b (S) is shown in Figures 9 and 10.

[0047] (preparation process) When attaching and fixing the base 13a of the beam member 13 to the underside of the main scaffolding board 1a(M) near the gable side, as shown in Figures 6 and 7, the beam member 13 is tilted, and the hook fitting 15 is inserted into the opening 12a from below the main scaffolding board 1a(M) suspended by the ropes 9a, and the hook fitting 15 is engaged with the upper surface of the end 3a of the girder side frame 3A. At this time, the engaging pin 16b of the fixing fitting 16 is removed, and the groove of the channel member 16a is opened.

[0048] Next, when the beam member 13 is lifted to a horizontal position, the end 5a of the center frame 5 is fitted into the groove of the channel member 16a of the fixing bracket 16 as shown in Fig. 8, and when the locking pin 16b is inserted into the channel member 16a, the locking pin 16b is locked onto the upper surface of the end 5a. Therefore, the end 5a is embraced from all around by the channel member 16a and the locking pin 16b. In this state, the end 3a of the girder side frame 3A is fitted into the groove between the upper surface of the base 13a and the hook fitting 15, and the hook fitting 15 engages with the upper surface and inner surface of the end 3a.

[0049] In the illustrated embodiment, the preparation process is carried out with the main scaffolding plank 1a (M) suspended by the ropes 9a, but it is also possible to carry out the preparation process on the ground, etc., and then lifting the main scaffolding plank 1a (M), to which the beam member 13 has already been attached and fixed, up to a predetermined height, and then suspending the main scaffolding plank 1a (M) at that height by the ropes 9a.

[0050] (Unit formation method) When the sub-scaffolding board 1b(S) is assembled to form the unit U1 by using the support part 13b of the beam member 13 while the main scaffolding board 1a(M) is suspended by the rope 9a, the girder side frame 3B, which is downwardly oriented with the sub-scaffolding board 1b(S) suspended by the rope 9b, is placed adjacent to the girder side frame 3A of the main scaffolding board 1a(M) as shown in Fig. 9 (adjacent step). With the joint means 6 (socket 6a and plug 6b) of the end frames 4, 4 of both scaffolding boards facing each other, the sub-scaffolding board 1b(S) is lowered toward the support part 13b so as to be in a horizontal position as shown in Fig. 10, and the joint means 6 is joined (joining step). As a result, the lower surface of the end part 5a of the center frame 5 of the sub-scaffolding board 1b(S) is supported by the support base 17 of the support part 13b (support step), and the unit U1 is formed.

[0051] When the joint means 6 is not joined and the sub-scaffolding board 1b (S) is changed from an inclined position to a horizontal position, the support base 17 of the support part 13b is arranged in a position facing the end part 5a of the center frame 5 on the sub-scaffolding board 1b (S), and is provided with a support surface 17a that receives the underside of the end part 5a and a protrusion 17b facing the side of the end part 5a.

[0052] For this reason, when the end portion 5a of the center frame 5 is temporarily placed on the support surface 17a along the inside of the protrusion 17b, the socket 6a and plug 6b of the joint means 6 are configured to face each other with their centers at the same height, and from this state, when the end portion 5a is slid on the support surface 17a to move the sub-scaffolding board 1b (S) toward the main scaffolding board 1a (M), the socket 6a and plug 6b are inserted and attached.

[0053] In this manner, the support base 17, with the support surface 17a and the protrusion 17b, constitutes a temporary placement means for receiving the end portion 5a of the center frame 5 and a positioning means for the temporary placement. The support surface 17a constitutes a guide means for sliding the end portion 5a in order to easily carry out the joining process.

[0054] In the configuration shown in the figure, the ropes 9 are connected to the hanging fittings of the scaffolding board 1, but they may be configured to be connected to the ends 5a of the center frame 5. For example, if the overall thickness dimension T (see FIG. 5) of the beam members 13 is formed thin, it is possible to form the attachment parts of the ropes 9 at the ends 5a of the center frame 5.

[0055] (One embodiment of a method for constructing a suspended scaffold) 11 to 14 show one embodiment of a method for constructing a suspended scaffold according to the present invention, and Fig. 11(A) to (C) show one cycle of a unit formation method in which a main scaffolding plank 1a (M) on the leading side in the row installation direction and a sub-scaffolding plank 1b (S) on the trailing side are assembled and integrated to form a unit U. In this embodiment, a unit U is constituted by one main scaffolding plank M and one sub-scaffolding plank S, and a cable removal process is carried out in which cables 9 are detached and removed from the sub-scaffolding planks S for each unit.

[0056] Figure 11(A) shows the state in which the main scaffolding board 1a(M), to which the beam member 13 has been attached and fixed through the preparation process, is suspended by ropes 9a. From this state, with the sub-scaffolding board 1b(S) suspended by ropes 9b, the unit formation method consisting of the adjoining process, joining process and supporting process described above is carried out, and a unit U1 is formed as shown in Figure 12(A).

[0057] The unit formation method is then repeated to sequentially line up units U2, U3 to Un starting from the first unit U1.

[0058] As shown in Fig. 12(A), when the unit U1 is formed, the rope 9b that has been suspending the sub scaffolding plank 1b(S) is removed while only the main scaffolding plank 1a(M) is suspended by the rope 9a. In other words, the rope removal process is carried out.

[0059] Even if the cable 9b is removed, the load of the sub-scaffolding plank 1b(S) is supported by the support part 13b of the beam member 13 of the main scaffolding plank 1a(M) suspended by the cable 9a. Therefore, the sub-scaffolding plank 1b(S) is not likely to fall and maintains its supported state. After that, the same cable removal process is carried out for the succeeding U2, U3 to Un which are arranged in a row after the unit connection process.

[0060] Incidentally, in the assembly method for forming the unit U shown in Figures 11(A) to (C) and 12(A), the rope 9b for suspending the sub-scaffolding board 1b(S) during the assembly work is removed and removed after the unit U is formed, and therefore does not need to be hung from directly above the scaffolding board 1b. In other words, the rope is hung by selecting a suspension point of a U-shaped anchor or the like lined up in a row on an existing structure, and in this case, the rope for supporting the load of the scaffolding board needs to be hung from a suspension point located directly above the scaffolding board, whereas the rope 9b of the scaffolding board 1b does not need to be hung from the suspension point located directly above the scaffolding board, since it is sufficient to prevent the scaffolding board 1b from falling only while the assembly method is being carried out. Therefore, the ropes 9b of the sub-scaffolding board 1b (S) may be suspended from a hanging point located near the hanging point of the main scaffolding board 1a (M), which has the advantage that a worker can perform the work of installing the ropes 9b of the sub-scaffolding board 1b (S) without leaning out from above the main scaffolding board 1a (M).

[0061] In this way, as shown in Figure 14, in the constructed suspended scaffolding, the cables are removed from one sub-scaffolding board (S) in each of the constructed units U1, U2, and U3, respectively, and the number of cables in the entire suspended scaffolding structure is reduced to half compared to the prior art.

[0062] (Another embodiment of a method for constructing a suspended scaffold) The method of constructing a suspended scaffolding of the present invention aims to form a unit U using a main scaffolding board (M) and a sub-scaffolding board (S) assembled using a beam member 13, and to detach and remove the ropes 9 from the sub-scaffolding board (S) by having the load of the sub-scaffolding board (S) supported by the beam member 13.

[0063] In this regard, in the above-described embodiment, the unit U is formed from a total of two scaffolding boards, one main scaffolding board (M) and one sub-scaffolding board (S), but in another embodiment described below, the unit U is formed from two main scaffolding boards (M1) (M2) and one sub-scaffolding board (S), thereby making it possible to suspend the main scaffolding board (M2) located in the center with the ropes 9 and to detach and remove the ropes 9 from the two scaffolding boards (M1) (S) located on both sides.

[0064] For this reason, a beam member 13 according to the second embodiment as shown in Fig. 15 is used. This beam member 13 is integrally formed with a first base portion 13a1 and a second base portion 13a2 which are attached and fixed to the undersides of the gable side vicinity of the two juxtaposed first main scaffolding planks 1A (M1) and second main scaffolding planks 1B (M2), and a support portion 13b which extends toward the underside of the gable side vicinity of the sub scaffolding plank 1C (S).

[0065] The first base 13a1 and the second base 13a2 are provided with mounting means 14 that are fixed to the first main scaffolding board 1A (M1) and the second main scaffolding board 1B (M2), respectively, and the support portion 13b is provided with a support base 17 that supports the end portion 5a of the center frame 5 of the sub scaffolding board 1C (S) from below. These mounting means 14 and support base 17 are illustrated as having the same configuration as those of the beam member according to the first embodiment described above, but are not limited thereto, and may be any that enables the unit formation method described below.

[0066] As shown in Figure 16, the first base 13a1 and the second base 13a2 of the beam member 13 are attached and fixed to the underside of the gable side of the first main scaffolding board 1A (M1) and the second main scaffolding board 1B (M2), which are joined to each other by a joint means 6, and a preparation process is carried out in which the support portion 13b of the beam member 13 is positioned toward the underside of the sub-scaffolding board 1C (S).After that, a unit formation method is carried out, which includes an adjoining process in which the sub-scaffolding board 1C (S) is placed adjacent to the second main scaffolding board 1B (M2) on top of the support portion 13b, a joining process in which the joint means 6 is joined, and a support process in which the sub-scaffolding board 1C (S) is supported by the support portion 13b of the beam member 13, thereby forming a unit U1.

[0067] Thereafter, the unit forming method is repeatedly carried out while carrying out the same unit connecting step as in the first embodiment described above, whereby units U2, U3 to Un are successively arranged in a row starting from the first unit U1, as shown in FIG.

[0068] When the first main scaffolding plank M1 for forming the succeeding unit is successively connected to the preceding unit by carrying out the unit connecting step, the preceding unit carries out the cable removing step of detaching and removing the cables from the first main scaffolding M1 and the sub-scaffolding plank S with the second main scaffolding plank M2 suspended by the cables 9. Alternatively, the cable removing step may be carried out each time each unit U is formed.

[0069] In this way, after the construction of the suspended scaffolding, the cables are removed from the two scaffolding boards in each of the constructed units U1, U2, etc., and the number of cables in the entire suspended scaffolding structure is reduced to one-third compared to the prior art. [Explanation of symbols]

[0070] 1 Scaffolding board 2. Flooring 3 Digit Side Frame 3A 1st digit side frame 3B Second girder side frame 3a, 3b ends 4 Gable side frame 4A First gable side frame 4B Second gable side frame 5 Center Frame 5a end 6 Joint means 6a Socket 6b Plug 7 Connecting pin 7a Bracket 8 long hole 9 cables 10 Window Hole 11 Hanging bracket 12a, 12b opening 13 Beam member 13a base 13b Support part 14 Mounting means 14a First mounting means 14b Second mounting means 15 Hook fitting 16 Fixing bracket 16a Channel member 16b Locking pin 17 Mounting stand 17a Contact surface 17b Protrusion

Claims

1. A suspended scaffold is constructed by suspending scaffolding boards from an existing structure with ropes and lining up multiple scaffolding boards in the extension direction of the existing structure. The scaffolding board (1) is provided with a pair of girder side frames (3A) and (3B) supporting a floor plate (2), end side frames (4A) and (4B) erected on the girder side frames, and joint means (6) for joining adjacent scaffolding boards in the row installation direction to each other, a preparation step of fixing a beam member (13) to an underside of a part of the main scaffolding board adjacent to the gable side of the leading scaffolding board in the row installation direction as a main scaffolding board (M) and a trailing scaffolding board adjacent to the trailing scaffolding board (S) and arranging a support part (13b) extended from the beam member toward the underside of the sub-scaffolding board, The main scaffolding plank and the sub scaffolding plank that have undergone the above preparation process are suspended by the ropes (9), an adjoining process of aligning the girder side frames (3) of both scaffolding boards; a joining step of joining both scaffolding boards to each other by the joint means (6); and a supporting step of supporting a sub-scaffolding board (S) on the supporting portion (13b) of the beam member attached and fixed to the main scaffolding board (M). This constitutes a unit forming method for forming a unit (U) using a plurality of scaffolding boards attached to the beam member, The method includes a unit connecting step of sequentially lining up units by repeatedly carrying out the unit forming method, and connecting the sub-scaffolding plank (S) of the preceding unit and the main scaffolding plank (M) of the succeeding unit by joining the joint means (6), A method for constructing a suspended scaffold, comprising a step of detaching and removing the ropes (9) from the sub-scaffolding planks (S) while the main scaffolding plank (M) of the scaffolding planks in the unit is suspended by the ropes (9).

2. Regarding the scaffolding boards and beam members for constructing the suspended scaffolding according to claim 1, The scaffolding board has a center frame (5) extending parallel to the girder side frame (3) disposed under the floor plate (2), and both ends (5a) of the center frame are fixed to the gable side frame (4) to connect them together. The two ends (3a) and (3b) of the girder side frame (3) and the two ends (5a) of the center frame (5) are configured to face the openings (12) formed between the side edges of the floor plate (2) and the gable side frame (4). The beam member (13) is integrally formed with a base portion (13a) that is attached and fixed to the underside of the main scaffolding board (M) near the gable side, and a support portion (13b) that extends from the base portion. The base (13a) is inserted from below into the opening (12) of the main scaffolding board (M) and is provided with mounting means (14) that is fixed to at least one of the ends (3a, 3b) of the girder side frame (3) and the end (5a) of the center frame (5).

3. The device for constructing a suspended scaffold as described in claim 2, characterized in that the mounting means (14) provided at the base (13a) of the beam member is composed of a hook fitting (15) that engages with the upper surface of the end (3a, 3b) of the girder side frame (3) when inserted into the opening (12) of the main scaffolding board (M) from below, and a fixing fitting (16) that embraces the end (5a) of the center frame (5) from all around.

4. The supporting portion (13b) of the beam member is provided with a support base (17) that supports from below the end portion (5a) of the center frame (5) of the sub-scaffolding board (S) joined to the main scaffolding board (M) via a joint means (6). A device for constructing a suspended scaffold as described in claim 2 or 3, characterized in that

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