JP7655783B2 - Method and device for constructing suspended scaffolding - Google Patents

Description

The present invention relates to a method for constructing suspended scaffolding and an apparatus for carrying out the method.

Traditionally, when constructing or renovating elevated structures such as highways, bridges, and other existing structures at high altitudes, suspended scaffolding is constructed that extends along the existing structure.

Suspended scaffolding boards (hereinafter simply referred to as "scaffolding boards") for constructing suspended scaffolding are generally configured as shown in Figures 1 to 3.

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 there is no distinction between the two) made of square pipe materials arranged parallel to each other 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 "girder side frames 4" when there is no distinction between the two) 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.

Furthermore, a center frame 5 made of a circular pipe material is arranged below the center of the width of the floor material 2, and both ends 5a, 5a are connected to the gable frame 4 by fixing them by welding or the like.

When multiple scaffolding boards are lined up in a row, the leading scaffolding board 1 and the trailing scaffolding board 1 are arranged so that the sides of the girder side frames 3A and 3B are adjacent to each other and connected by joint means 6 provided on the gable side frames 4A and 4B. Note that the joint means 6 may also be provided on the girder side frames 3A and 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.

In the illustrated example, the gable side 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. One of the ends is opened onto the outer surface of the first girder side frame 3A to form a socket 6a, and the other end is fitted with a member that protrudes outward beyond the outer surface of the second girder side frame 3B to form a plug 6b. The plug 6b is inserted into the socket 6a between the gable side frames 4, 4 of adjacent scaffolding boards 1, 1 to connect them, forming a joint means 6.

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

However, as typified by expressways, the extension direction of an elevated structure is not necessarily limited to a straight line, but can also include curved lines. Therefore, the suspended scaffolding must also be constructed in a direction that corresponds 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 socket 6a are allowed to slide within the range of the long hole 8, making it possible to adjust the distance between adjacent scaffolding boards 1, 1.

In the example shown in the figure, the connecting pin 7 is tethered to a rope such as a chain to prevent loss, and the rope is attached to a bracket 7a fixed to the ends 3a, 3a of the first girder side frame 3A.

When constructing a suspended scaffold, the scaffold boards 1 are lined up along the existing structure by alternately connecting the sockets 6a and plugs 6b, and are suspended from the underside of the existing structure by ropes 9 such as chains. To enable such suspension by 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.

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

Patent No. 6366472 Patent No. 6426917 Patent No. 6663726

All of the numerous scaffolding boards lined up to construct the suspended scaffolding are suspended by multiple ropes 9.

As mentioned above, adjacent leading and trailing scaffolding boards are connected by joint means 6, but joint means 6 is intended to connect 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, there is a risk that the board will fall, which is extremely dangerous.

As a result, a large number of cables 9 are stretched across the floor of the constructed suspended scaffolding.

By the way, the suspended scaffolding is designed to expand the floor surface by transporting additional scaffolding boards to a designated position in sequence to the floor surface constructed by the previously installed scaffolding boards, and then adding subsequent scaffolding boards one by one.

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

In addition to the problem of transporting scaffolding boards, there is also the problem of workers moving around on the floor surface being hindered by the large number of cables.

The present invention relates to the ropes that are stretched in a forest-like fashion on the floor surface of a suspended scaffold, and has discovered that it is possible to configure the ropes to be detached and removed from the scaffolding boards that are arranged in a straight line at least in the structure of the suspended scaffold. As a result, the objective of the present invention is to provide a method and device for constructing a suspended scaffold that solves the above problem by reducing the number of ropes.

The method of constructing a suspended scaffold of the present invention is configured as a means for constructing a suspended scaffold by suspending a scaffold board from an existing structure with cables and lining up a number of scaffold boards in sequence in the extension direction of the existing structure, and the scaffold boards are provided with a pair of girder side frames supporting the floor board, a girder side frame erected on the girder side frames, and joint means for joining adjacent scaffold boards in the lining direction to each other, and includes a preparation step in which the leading scaffold board adjacent in the lining direction is the main scaffold board and the trailing scaffold board is the sub-scaffold board, a beam member is attached and fixed to the underside of the main scaffold board near the gable side, and the support part extended from the beam member is positioned toward the underside of the sub-scaffold board, and the main scaffold board and the sub-scaffold board that have undergone the preparation step are suspended by cables. The unit formation method forms a unit from multiple scaffolding boards attached to beam members by the adjacent process of arranging the girder side frames of both scaffolding boards next to each other, the joining process of joining both scaffolding boards to each other with the joint means, and the supporting process of supporting the sub-scaffolding board on the supporting part of the beam member attached and fixed to the main scaffolding board. The unit formation method is repeatedly performed to sequentially line up the units, and the unit connection process connects the sub-scaffolding board of the preceding unit and the main scaffolding board of the following unit by joining the joint means between them, and includes a process of removing the rope from the sub-scaffolding board while the main scaffolding board of the unit is suspended by the rope.

In addition, the device for constructing a suspended scaffold of the present invention is configured as a means in that, with regard to the scaffolding boards and beam members for constructing the suspended scaffolding, the scaffolding boards have a center frame extending parallel to the girder side frame arranged on the underside of the floor board , and both ends of the center frame are fixedly connected to the gable side frame, so that both ends of the girder side frame and both ends of the center frame face the opening formed between both side edges of the floor board and the gable side frame, and the beam members integrally form 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, and the base is provided with an attachment means that is attached and fixed to at least one of the ends of the girder side frame and the center frame when inserted into the opening of the main scaffolding board from below.

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 is inserted from below into the opening of the main scaffolding board and engages with the upper surface of the end of the girder side frame, and a fixing fitting that embraces the end of the center frame from all around.

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

The present invention has the effect of reducing the number of cables in the entire suspended scaffolding structure, improving the environment in which numerous cables were stretched across the floor surface in a forested manner as in the conventional technology.

FIG. 1 is a perspective view showing a scaffolding board in a conventional suspended scaffolding. FIG. 1 is a perspective view showing a conventional method for arranging scaffolding boards. FIG. 1 is a perspective view showing a portion of a suspended scaffold constructed by arranging conventional scaffolding boards in a row. 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. FIG. 2 is an oblique view showing a beam member according to the first embodiment in a separated state from a main scaffolding board. 13 is a perspective view showing the state when the base of the beam member is attached to the main scaffolding board. FIG. 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. 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. 1 is a perspective view showing a state in which a sub-scaffolding board is placed adjacent to a main scaffolding board above the support portion of the beam member, with their joint means facing each other, in relation to a unit forming method. FIG. 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. FIG. 1 shows 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, for a method of constructing a suspended scaffolding according to one embodiment of the present invention, 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 support process in which the sub-scaffolding board is supported on the support part of the beam member. Regarding a method of constructing a suspended scaffolding, the unit shown in Figure 11 is used as 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 board 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 board, (B) is an oblique view showing the state in which the main scaffolding board for forming the trailing unit is placed adjacent to the sub-scaffolding board 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. 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 Figure 12 (C) in relation to a method of constructing a suspended scaffolding. 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. 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. 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. This is an oblique view showing a state in which, for a suspended scaffolding constructed by a method according to another embodiment of the present invention, the main scaffolding board located in the center of the three scaffolding boards that form a unit is suspended by a rope, and the ropes are removed from the main scaffolding board and sub-scaffolding board located on both sides of it, thereby carrying out a rope removal process.

A preferred embodiment of the present invention will be described in detail below with reference to the drawings.

(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 ropes 9, thereby constructing a suspended scaffold.

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

Then, the leading main scaffolding board 1a (M) and the trailing sub-scaffolding board 1b (S), to which the beam member 13 has been attached and fixed through the preparation process, are suspended by the ropes 9a and 9b, respectively, and a unit formation method is carried out in which the girder side frames 3B and 3A of both scaffolding boards are arranged side by side, a joining process is performed in which the gable side frames 4 facing each other of both scaffolding boards are joined by the joint means 6, and a support process is performed in which the sub-scaffolding board 1b (S) is supported on the support part 13b extended from the base part 13a of the beam member 13 attached and fixed to the main scaffolding board 1a (M), thereby forming 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.

Then, by repeatedly carrying out the unit formation method, units U2, U3 to Un are lined up in sequence starting from the first unit U1. At this time, a unit connection 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.

In the case of one embodiment shown in Figures 4 to 14, the 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).

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

Then, the second unit U2 is formed by repeating the unit formation method. In other words, the main scaffolding board 1c (M) and its subsequent sub-scaffolding board 1d (S) are suspended by ropes 9c and 9d, respectively, and the adjoining process, joining process, and supporting process are carried out, forming the second unit U2, which is then lined up connected to the first unit U1. Thereafter, the subsequent units U3 to Un are lined up in a similar manner.

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.

Therefore, when the unit U is formed, only the main scaffolding board M of the unit U is suspended by the ropes 9, and a rope removal process is carried out in which the ropes 9 that were suspending the sub-scaffolding board S are removed.

For example, in the first unit U1, even if the cable 9b is removed from the sub-scaffolding board 1b (S), there is no risk of the sub-scaffolding board 1b (S) falling, and the support state is firmly maintained. After that, a similar cable removal process is carried out for the subsequent units U2, U3 to Un, which are lined up after the unit connection process.

The timing of performing the cable removal process 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 board 1c(M) for forming a new unit U2 on the trailing side is joined to the sub-scaffolding board 1b(S) in the unit U1 formed on the leading side via the joint means 6 and the unit connection process is performed, the cable removal process may be performed to remove and remove the cable 9 that was suspending the sub-scaffolding board 1bS in the leading unit U1. In this case, the load of the sub-scaffolding board 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 board 1a(M) suspended by the cable 9a. The sub-scaffolding planks 1b (S) are connected via joint means 6 to the main scaffolding plank 1a (M) suspended by cables 9a on the leading side, and to the main scaffolding plank 1c (M) suspended by cables 9c on the trailing side to form the second unit U2, preventing misalignment in any direction, giving workers a sense of security.

(First embodiment of beam member)
5-10 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 a framework of square pipe material or the like, and has a base portion 13a and a support portion 13b which are integrally formed in series.

With respect to the width dimension W, which is determined by the spacing dimension of the outer surfaces of the girder side frames 3A and 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 part 13b is formed so that L2≦W (preferably L2≒W).

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

A mounting 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 mounting means 14 is preferably composed of a first mounting means 14a that is 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 mounting means 14b that is attached and fixed to the end 5a of the center frame 5, but it may be composed of only one of the first mounting means 14a and the second mounting means 14b as long as the structure allows for firm attachment and fixation. Alternatively, a third mounting means (not shown) may be further provided.

In the illustrated embodiment, the first attachment means 14a is configured with a hook fitting 15 that engages with the upper surface of the end 3a of the girder side frame 3A by being 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. 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.

In contrast, the second mounting means 14b is composed of a grooved member 16a that holds the end 5a of the center frame 5 from below, and a fixing bracket 16 that is removably inserted into the grooved member 16a and engages across the upper surface of the end 5a when inserted.

On the other hand, a support base 17 is fixed to the upper surface of the support portion 13b, which supports the end portion 5a of the center frame 5 of the following sub-scaffolding board 1b (S) from below.

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

(Preparation process)
When the base 13a of the beam member 13 is attached and fixed 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-shaped member 16a is opened.

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 to the upper surface of the end 5a. Therefore, the channel member 16a and the locking pin 16b embrace the end 5a from all around. 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.

In the illustrated embodiment, the preparation process is carried out with the main scaffolding board 1a (M) suspended by the ropes 9a, but it is also possible to carry out the preparation process on the ground, etc., and then lift the main scaffolding board 1a (M) to which the beam members 13 have already been attached and fixed, up to a specified height, and then suspend the main scaffolding board 1a (M) at that height by the ropes 9a.

(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 of the sub-scaffolding board 1b (S) suspended by the rope 9b is inclined and facing downward, and the girder side frame 3B is adjacent to the girder side frame 3A of the main scaffolding board 1a (M) as shown in Fig. 9 (adjacent process). 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 to a horizontal position toward the support part 13b as shown in Fig. 10, and the joint means 6 is joined (joining process). As a result, the lower surface of the end 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 process), and the unit U1 is formed.

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 abutment base 17 of the support part 13b is arranged in a position facing the end 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 5a and a protrusion 17b that faces the side of the end 5a.

For this reason, when the end 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 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.

In this way, the support base 17, with its support surface 17a and protrusion 17b, constitutes a temporary placement means for receiving the end 5a of the center frame 5 and a positioning means for temporary placement. The support surface 17a also constitutes a guide means for sliding the end 5a to facilitate the joining process.

In the configuration shown in the figure, the rope 9 is connected to the hanging fitting of the scaffolding board 1, but it may be configured to be connected to the end 5a of the center frame 5. For example, if the overall thickness dimension T (see FIG. 5) of the beam member 13 is formed thin, it is possible to form an attachment portion for the rope 9 at the end 5a of the center frame 5.

(One embodiment of a method for constructing a suspended scaffold)
11 to 14 show one embodiment of the 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 leading main scaffold board 1a (M) and a trailing sub-scaffold board 1b (S) in the row installation direction are assembled and integrated to form a unit U. In this embodiment, a unit U is formed by one main scaffold board M and one sub-scaffold board S, and a cable removal process is carried out to remove and remove the cable 9 from the sub-scaffold board S for each unit.

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 the ropes 9a. From this state, the sub-scaffolding board 1b (S) is suspended by the ropes 9b, and the unit formation method consisting of the adjoining process, joining process, and support process described above is carried out, and a unit U1 is formed as shown in Figure 12 (A).

The unit formation method is then repeated to sequentially line up units U2, U3, and Un, starting with the first unit U1.

As shown in FIG. 12(A), when unit U1 is formed, the rope 9b that holds the sub-scaffolding board 1b (S) is removed and removed while only the main scaffolding board 1a (M) is suspended by the rope 9a. In other words, the rope removal process is carried out.

Even if the cable 9b is removed, the load of the sub-scaffolding board 1b (S) is supported by the support part 13b of the beam member 13 of the main scaffolding board 1a (M) suspended by the cable 9a. Therefore, the sub-scaffolding board 1b (S) is not at risk of falling and maintains its supported state. After that, a similar cable removal process is carried out for the subsequent U2, U3 to Un, which are lined up after the unit connection process.

11(A) to (C) and 12(A) in the assembly method for forming the unit U, the rope 9b that suspends the sub-scaffolding board 1b (S) during the assembly work is removed and removed after the unit U is formed, so it is not necessary to install it from directly above the scaffolding board 1b. In other words, the rope is installed by selecting a suspension point of a U-shaped anchor or the like installed in a row on an existing structure, and in this case, the rope for supporting the load of the scaffolding board needs to be installed from a suspension point located directly above the scaffolding board, whereas the rope 9b of the scaffolding board 1b does not need to be installed because it is sufficient to prevent the scaffolding board 1b from falling only while the assembly method is being performed. Therefore, the ropes 9b of the sub-scaffolding board 1b (S) may be hung from a suspension point located near the suspension point of the main scaffolding board 1a (M), which has the advantage that workers can perform the work of hanging the ropes 9b of the sub-scaffolding board 1b (S) without having to lean over the main scaffolding board 1a (M).

In this way, as shown in Figure 14, in the constructed suspended scaffolding, the ropes are removed from one sub-scaffolding board (S) in each of the constructed units U1, U2, and U3, and the number of ropes in the entire suspended scaffolding structure is reduced to half compared to the conventional technology.

(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.

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 allowing the main scaffolding board (M2) located in the center to be suspended by the ropes 9 and the ropes 9 to be detached and removed from the two scaffolding boards (M1) (S) located on both sides.

For this reason, a beam member 13 according to the second embodiment as shown in Figure 15 is used. This beam member 13 is integrally formed with a first base portion 13a1 and a second base portion 13a2 that are attached and fixed to the underside of the gable side of the two juxtaposed first main scaffolding boards 1A (M1) and second main scaffolding boards 1B (M2), and a support portion 13b that extends toward the underside of the gable side of the sub-scaffolding board 1C (S).

The first base 13a1 and the second base 13a2 are provided with mounting means 14 that are fixed to the first main scaffold board 1A (M1) and the second main scaffold 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 scaffold 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 in the first embodiment described above, but are not limited to this and may be any that enables the unit formation method described below.

As shown in FIG. 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 the joint means 6, and a preparation process is carried out in which the support part 13b of the beam member 13 is positioned toward the underside of the sub-scaffolding board 1C (S). Then, 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 the support part 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 part 13b of the beam member 13, thereby forming the unit U1.

Then, by repeating the unit formation method while carrying out the unit connection process similar to that in the first embodiment described above, units U2, U3 to Un are lined up in sequence starting from the first unit U1, as shown in Figure 17.

When the first main scaffolding board M1 for forming the following unit is connected to the leading unit by carrying out the unit connection process, the leading unit carries out the cable removal process in which the cables are removed from the first main scaffolding M1 and the sub-scaffolding board S while the second main scaffolding board M2 is suspended by the cable 9. Alternatively, the cable removal process may be carried out each time each unit U is formed.

In this way, after construction, the suspended scaffolding has the cables removed from the two scaffolding plates in each of the constructed units U1, U2, etc., and the number of cables in the entire suspended scaffolding structure is one-third of that in the conventional technology.

1 Scaffolding board 2 Floor material 3 Girder side frame 3A First girder side frame 3B Second girder side frame 3a, 3b End 4 End side frame 4A First girder side frame 4B Second girder side frame 5 Center frame 5a End 6 Joint means 6a Socket 6b Plug 7 Connecting pin 7a Bracket 8 Long hole 9 Rope 10 Window hole 11 Suspension fittings 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 fitting 16a Channel member 16b Locking pin 17 Support base 17a Support surface 17b Protrusion

Claims (4)

A suspended scaffold is constructed by suspending a scaffolding board from an existing structure with a rope and lining up a number of 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). 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 into the opening (12) of the main scaffolding board (M) from below and is provided with an attachment means (14) that is attached and 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). The device for constructing a suspended scaffold as described in claim 2, characterized in that the mounting means (14) provided on 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 from below into the opening (12) of the main scaffold board (M), and a fixing fitting (16) that embraces the end (5a) of the center frame (5) from all around. The device for constructing a suspended scaffold as described in claim 2 or 3, characterized in that the support 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-scaffold board (S) joined to the main scaffold board (M) via a joint means (6).

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