JP2021067028A - Suspended scaffold and its installation method - Google Patents

Abstract

To provide a suspended scaffold and its installation method with which installation can be efficient by reducing traffic restrictions even if there is a motorway below a bridge body.SOLUTION: A scaffold body 10 formed to be foldable by making multiple floor panels 20 to rotate with each other is used, the scaffold body 10 folded in a direction perpendicular to a bridge axis on the ground below a bridge body is provided, the scaffold body 10 in the folded state is lifted to the bridge body side, and at the same time, as a suspended scaffold that extends horizontally in the direction perpendicular to the bridge axis is formed via deployment so that it extends in the direction perpendicular to the bridge axis, the suspended scaffold that extends horizontally can be formed in a short time simply by unfolding the folded scaffold body 10. At that time, by arranging the scaffold body 10 on the ground in a folded state, it is possible to use a yard 5 as a median strip at a place where the scaffold body 10 is placed on the ground, and the suspended scaffold can be installed efficiently with reduced traffic restrictions.SELECTED DRAWING: Figure 8

Description

The present invention relates to a suspended scaffold that is used at a work site such as new construction, repair, and floor slab replacement of a bridge, and is suspended from the main body of the bridge, and an installation method thereof.

Conventionally, when a steel girder is deteriorated and damaged in a bridge such as a general road or an expressway, a work scaffold is installed directly under the steel girder to repair, reinforce, or process the damaged part. In addition, when the floor slab becomes old, the existing floor slab is removed from the main girder and a new floor slab is erected to replace the floor slab. Even in that case, scaffolding for work is installed on the main body of the bridge, but there are many cases where there are roadways and the like below and near the lower part, and the scaffolding cannot be assembled from the ground. Therefore, in such a bridge, a suspended scaffold suspended from a bridge girder or the like is used (see, for example, Patent Document 1).

27 to 29 show a method of installing a conventional suspended scaffold on a bridge. In the bridge shown in FIG. 27, a plurality of main girders 1 arranged at intervals in the width direction are supported by piers 2, and a floor slab 3 is installed on each main girder 1. Further, on the ground below the bridge, a two-lane roadway 4 on each side is provided so as to pass on both sides of the pier 2. A pier 2 is arranged between the roads 4, and a yard 5 forming a median strip between the roads 4 is provided.

When installing the suspension scaffolding 6 on this bridge, first, as shown in FIG. 28, the lane 4 with two lanes on one side is completely restricted and the road is closed, and the lane 4 with two lanes on one side is face-to-face. Then, above the one roadway 4 that has been closed to traffic, as shown in FIG. 29, the suspended scaffolds 6 that are half in the direction perpendicular to the bridge axis are sequentially installed in the bridge axis direction by predetermined scaffolding installation sections L (for example, 20 m in the bridge axis direction). To do. For example, one section L is installed for two days (only at night). After that, the roadway 4 with two lanes on one side is completely restricted and the road is closed, and the roadway 4 with two lanes on one side is used as two-way traffic. Then, above the other roadway 4 which is closed to traffic, the other half of the suspension scaffolding 6 in the direction perpendicular to the bridge axis is sequentially installed in each section L in the direction perpendicular to the bridge axis, thereby suspending the entire bridge axis in the direction perpendicular to the bridge axis. Scaffolding 6 is completed.

Japanese Unexamined Patent Publication No. 2004-316070

By the way, when installing the suspension scaffolding 6 as described above, traffic is regulated on the roadway 4 below the bridge body, and the scaffolding members (suspension chain, single pipe, scaffolding board, etc.) are carried in and assembled on the ground. It is necessary to use aerial work platforms, etc., but since it is not possible to regulate traffic for a long time in urban areas with heavy traffic, it is necessary to carry out short sections at night. For this reason, there is a problem that the scaffolding installation work cannot be performed efficiently and the scaffolding installation work period is lengthened.

The present invention has been made in view of the above problems, and an object of the present invention is a suspended scaffold that can be efficiently installed with less traffic regulation even when there is a roadway or the like below the bridge body. To provide an installation method.

In order to achieve the above object, the present invention is a scaffold formed so as to be foldable by rotating a plurality of floor panels rotatably connected to each other in a suspended scaffold installed suspended from a bridge body. It has a main body.

Further, in order to achieve the above object, the present invention can be folded by rotating a plurality of floor panels rotatably connected to each other in a method of installing a suspended scaffold suspended from a bridge body. Using the scaffolding body formed in, the scaffolding body folded in the direction perpendicular to the bridge axis is placed on the ground below the bridge, and the scaffolding body in the folded state is lifted to the bridge body side and in the direction perpendicular to the bridge axis. By deploying so as to extend, a suspended scaffold extending horizontally in the direction perpendicular to the bridge axis is formed.

As a result, a suspended scaffold that extends horizontally is formed by unfolding the folded scaffold body. Therefore, compared to the conventional case where the scaffold members are carried in and assembled below the bridge body. , It is possible to easily form a suspended scaffold extending horizontally in the direction perpendicular to the bridge axis in a short time. Further, also in the direction of the bridge axis, the suspended scaffold can be easily expanded in a short time by connecting the deployed scaffold main bodies. At that time, by arranging the scaffolding body in a folded state on the ground, it is possible to use a yard as a median strip at a place where the scaffolding body is arranged on the ground, for example.

According to the present invention, a suspended scaffold extending horizontally in the direction of the bridge axis can be easily formed in a short time, and for example, a yard as a median strip can be used as a place for arranging the scaffold body on the ground. Therefore, even if there is a roadway or the like below or near the lower part of the bridge body, it is possible to efficiently install the suspended scaffolding by reducing traffic restrictions, and the installation construction period of the suspended scaffolding can be significantly shortened.

Top view of a suspended scaffold showing the first embodiment of the present invention Top view of the main part of the suspended scaffolding Perspective view of the main part of the suspended scaffolding Schematic front view showing the installation process of the suspended scaffolding Schematic front view showing the installation process of the suspended scaffolding Schematic front view showing the installation process of the suspended scaffolding Schematic front view showing the installation process of the suspended scaffolding Schematic front view showing the installation process of the suspended scaffolding Schematic front view showing the installation process of the suspended scaffolding Schematic front view showing the installation process of the suspended scaffolding Schematic front view showing the installation process of the suspended scaffolding Schematic plan showing the installation process of the suspended scaffolding Schematic front view of a floor panel showing an example of deployment of a suspended scaffold Schematic front view of floor panel showing other deployment examples of suspended scaffolding Schematic plan showing the installation process of the suspended scaffold showing the second embodiment of the present invention. Schematic front view showing the installation process of the suspended scaffolding Schematic front view showing the installation process of the suspended scaffolding Schematic front view showing the installation process of the suspended scaffolding Schematic front view showing the installation process of the suspended scaffolding Schematic front view showing the installation process of the suspended scaffolding Schematic front view showing the installation process of the suspended scaffolding Top view of the main part of the suspended scaffold showing a modified example of the connecting member Enlarged front view of the connecting member showing the connected state Enlarged front view of the connecting member showing the disconnected state An exploded perspective view of a connecting member showing a connecting process. Perspective view of the connecting member showing the connected state Schematic front view showing the installation process of a conventional suspended scaffold Schematic front view showing the installation process of a conventional suspended scaffold Schematic plan showing the installation process of a conventional suspended scaffold

1 to 14 show the first embodiment of the present invention, and show, for example, a method of installing a suspended scaffold used at a work site of a bridge floor slab replacement construction. The same components as those in the conventional example are designated by the same reference numerals.

The suspended scaffold of the present embodiment is provided with a scaffolding body 10 that can be folded in the direction perpendicular to the bridge axis, and is installed by lifting the scaffolding body 10 in the folded state and deploying it in the direction perpendicular to the bridge axis.

The scaffolding body 10 has a plurality of floor panels 20, and each floor panel 20 is rotatably connected to each other via a connecting member 30.

The floor panel 20 is formed by joining a pair of vertical frames 21 and a pair of horizontal frames 22 made of pipe-shaped members such as steel pipes in a quadrangular frame shape, and inside each vertical frame 21 and each horizontal frame 22. A removable plate material 23 is attached. A connecting pin 21a having an outer diameter equivalent to the inner diameter of the vertical frame 21 is provided at one end of the vertical frame 21, and by inserting the connecting pin 21a into the other end of the other vertical frame 21, the vertical frames 21 are pivoted to each other. It is designed to be connected in the direction.

The connecting member 30 is composed of a pair of cylindrical members 31 that rotatably insert the vertical frame 21 into the inside, and the cylindrical members 31 are joined to each other in the radial direction via the joint portion 32. Each cylindrical member 31 is formed of a steel pipe having a length shorter than that of the vertical frame 21, and both ends of the vertical frame 21 in the axial direction are exposed to the outside from both ends of each cylindrical member 31. Further, the connecting member 30 has a hanging ring 33 for connecting a hanging wire or a chain, and the hanging ring 33 is provided at the center of each cylindrical member 31 in the axial direction. The ring 33 can also be provided at another location of each cylindrical member 31.

The scaffolding body 10 configured as described above includes a number of floor panels 20 (six in the present embodiment) according to the scaffolding installation site, and rotates each floor panel 20 via each connecting member 30. Allows it to be folded in the longitudinal direction. In this case, the floor panel 20 is formed, for example, with a vertical dimension S1 (length of the vertical frame 21) of about 2 m and a horizontal dimension S2 (length of the horizontal frame 22) of about 2.5 m. Further, as shown in FIG. 1, the scaffolding body 10 is extended in the longitudinal direction (direction perpendicular to the bridge axis), and the other scaffolding body 10 is connected via the connecting member 21a so that the entire scaffolding is oriented in the bridge axis direction. Can be expanded.

Here, with reference to FIGS. 4 to 12, a method of installing the suspended scaffolding of the present embodiment on the bridge main body will be shown. As shown in FIG. 4, the bridge main body in the present embodiment is located above the roadway 4 having two lanes on each side and has five main girders 1, as shown in FIG. In the following description, each floor panel 20 of the scaffolding body 10 is referred to as the first, second, and third sheets from the center of the scaffolding body 10 to the left and right (in the direction perpendicular to the bridge axis), respectively. Further, the illustration of the piers in FIGS. 5 to 11 is omitted.

First, as shown in FIG. 5, three first hoisting machines 40 are attached to each of the three main girders 1 on the center side. Each first lifting machine 40 is composed of, for example, an electric chain block with an electric trolley having a lifting capacity of about 2 tons, and is attached to the lower flange of the main girder 1 so as to be movable in the bridge axis direction. Further, in the yard 5 on the ground, a reduced scaffolding body 10 in which the floor panels 20 are folded so as to overlap each other in the thickness direction is vertically arranged.

Next, as shown in FIG. 6, the chain 41 of the first lifting machine 40 in the center is connected to the connecting member 30 of the first floor panel 20 of the scaffolding body 10, and the second and third ones are connected. The floor panels 20 of the above are rotated by 90 ° to the left and right outside by their own weight around the connecting member 30 with each of the first floor panels 20.

After that, as shown in FIG. 7, one floor panel 20 of the scaffolding main body 10 is lifted by the first lifting machine 40 in the center, and the second and third floor panels 20 are respectively the first. The connecting member 30 with each floor panel 20 of the above is rotated 90 ° inward to the left and right by its own weight.

Subsequently, as shown in FIG. 8, the chains 41 of the first lifting machines 40 on both the left and right sides are connected to the connecting member 30 between the first floor panel 20 and the second floor panel 20, respectively. At the same time, the scaffolding body 10 is further lifted by the first lifting machine 40 in the center.

Next, as shown in FIG. 9, the first lifting machines 40 on both the left and right sides rotate the first floor panel 20 upward by 90 ° so as to be horizontal. Further, two second lifting machines 50 are attached to the two main girders 1 on the left and right outer sides, respectively, and the chains 51 of each of the second lifting machines 50 are attached to the second floor panel 20 and the third, respectively. It is connected to the connecting member 30 between the floor panel 20 and the floor panel 20. Each second lifting machine 50 is composed of, for example, an electric chain block having a lifting capacity of about 200 kg, and is detachably attached to the lower flange of the main girder 1. Since the steps up to this point are performed in and above the yard 5, traffic restrictions on each lane 4 are not applied. However, in the preparatory work such as when connecting the second lifting machine 50 to the scaffolding main body 10, only one inner lane (yard 5 side) of each lane 4 is used as in the post-process shown in FIGS. 10 and 11. It is necessary to carry out partial regulation of traffic, but it does not lead to long-term traffic regulation because temporary short-term regulation is sufficient.

Subsequently, as shown in FIG. 10, each of the second lifting machines 50 on both the left and right sides rotates the second floor panel 20 upward by 90 ° so as to be horizontal. Since this process is a work in a range including the upper part of one inner lane of each lane 4, traffic regulation is performed to partially regulate only one inner lane of each lane 4. The same applies to the subsequent steps.

Next, as shown in FIG. 11, each of the third floor panels 20 is manually rotated 90 ° upward so as to be horizontal, and is connected to the two main girders 1 on the left and right outer sides by suspension chains 60, respectively. To do. As a result, the scaffolding body 10 developed so that all the floor panels 20 extend horizontally in the direction perpendicular to the bridge axis is held directly under each main girder 1, and each connecting member 30 is held by a hanging chain, a hanging wire, or the like (not shown). A hanging scaffold is installed by connecting to each main girder 1.

After that, each of the second lifting machines 50 is removed from the main girder 1, and each first lifting machine 40 is moved along the main girder 1 to the next scaffolding installation position. Then, a new suspension scaffold is installed by lifting and deploying the next scaffold main body 10 by the same process as described above, and the suspension scaffold is provided in the bridge axis direction by sequentially performing the steps of connecting the scaffold main bodies 10 to each other. Expand. At that time, as shown in FIG. 12, the suspended scaffolding by the scaffolding body 10 is sequentially installed in the bridge axis direction by a predetermined scaffolding installation section L (for example, 20 m in the bridge axis direction). For example, one section L is installed in one day (only at night).

As described above, according to the present embodiment, the scaffolding body 10 folded in the direction perpendicular to the bridge axis is arranged on the ground below the bridge body, and the scaffolding body 10 in the folded state is lifted to the bridge body side. By deploying so as to extend in the direction perpendicular to the bridge axis, a suspended scaffold extending horizontally in the direction perpendicular to the bridge axis is formed. Can be formed. As a result, the scaffolding can be formed in a shorter time than in the conventional case where the scaffolding members (suspension chain, single pipe, scaffolding plate, etc.) are carried in and assembled. At that time, since the scaffolding body 10 is placed on the ground in a folded state, the yard 5 as a median strip can be used as the placement location of the scaffolding body 10 on the ground, and the lifted scaffolding body 10 can be used. Some deployments can also be done above the yard 5. Therefore, the scaffolding body 10 before installation and a part of the deployment work can be performed without traffic regulation of each roadway 4, and only the deployment work in the range beyond the upper part of the yard 5 can be performed on each roadway 4. Since it is only necessary to partially regulate the suspension scaffolding, it is possible to reduce traffic restrictions and efficiently install the suspension scaffolding, and it is possible to significantly shorten the installation construction period of the suspension scaffolding.

Further, the scaffolding body 10 is composed of a plurality of floor panels 20 rotatably connected to each other, and the scaffolding body 10 folded so that the floor panels 20 overlap each other in the thickness direction is formed in the thickness direction of each floor panel 20. Since the scaffolding is arranged vertically so that it faces the direction perpendicular to the bridge axis, the space for arranging the folded scaffolding body 10 can be reduced, and the narrow implementation such that the roadway 4 is below the bridge body. It is extremely advantageous for hanging scaffolding installation work in the place.

Further, the central portion of the reduced scaffold body 10 in the direction perpendicular to the bridge axis is lifted, and the scaffold body 10 is extended from the center side in the direction perpendicular to the bridge axis toward the outside in the direction perpendicular to the bridge axis. It is extremely advantageous when the yard 5 as the central separation zone located below the central side is used.

In addition, by connecting a plurality of scaffolding bodies 10 extending in the direction perpendicular to the bridge axis in the direction of the bridge axis, the suspended scaffolding is sequentially installed in the direction of the bridge axis. Even when the number of suspension scaffolds is limited, the suspension scaffolding can be installed in detail, and the installation work can be performed more efficiently.

In the above embodiment, the scaffolding body 10 in which six floor panels 20 are connected in a row is used, but the number of floor panels 20 in one scaffolding body 10 is the width in the direction perpendicular to the bridge axis of the bridge. It can be any number depending on the number of sheets.

Further, in the above-described embodiment, the scaffolding main body 10 in which the floor panels 20 are connected in a row is lifted one by one. For example, a scaffolding machine 40 having a high lifting capacity is used. By doing so, it is possible to pull up a scaffolding body 10 in which a plurality of scaffolding bodies 10 are connected in advance at one time.

Further, in the above-described embodiment, the scaffolding body 10 is extended from the center side in the direction perpendicular to the bridge axis toward the outside in the direction perpendicular to the bridge axis, respectively. It may be extended in one direction.

Further, in the deployment of the scaffolding body 10, each floor panel 20 may be rotated in either the clockwise direction shown in FIG. 13 or the counterclockwise direction shown in FIG. 14, and the folded scaffolding body 10 may be used as a scaffolding. It can be appropriately configured according to the installation site.

Further, side surfaces (so-called "morning glory") on both sides in the direction perpendicular to the bridge axis and protective work are separately installed on the suspended scaffold, but the side surfaces are rotatably attached to the floor panels 20 at both ends of the scaffold body 10 in advance. You may leave it.

Since FIGS. 15 to 21 show the second embodiment of the present invention, other installation methods of the suspended scaffold of the first embodiment are shown. The same components as those in the first embodiment are designated by the same reference numerals.

In the first embodiment, the scaffolding main body 10 is lifted and deployed by using the first lifting machine 40 and the second lifting machine 50, but in the present embodiment, the first Only the lifting machine 40 is used. In the following description, as in the first embodiment, the first, second, and third floor panels 20 of the scaffolding body 10 are placed from the center of the scaffolding body 10 to the left and right (in the direction perpendicular to the bridge axis), respectively. That is. Moreover, the illustration of the pier is omitted.

First, as shown in FIG. 15, three first hoisting machines 40 are attached to the central main girder 1 and the two main girders 1 on the left and right sides, respectively. Further, in the yard 5 on the ground, a reduced scaffolding body 10 in which the floor panels 20 are folded so as to overlap each other in the thickness direction is vertically arranged.

Next, as shown in FIG. 16, the chain 41 of the first lifting machine 40 in the center is connected to the connecting member 30 of the first floor panel 20 of the scaffolding body 10, and the second and third ones are connected. The floor panels 20 of the above are rotated by 90 ° to the left and right outside by their own weight around the connecting member 30 with each of the first floor panels 20.

After that, as shown in FIG. 17, one floor panel 20 of the scaffolding main body 10 is lifted by the first lifting machine 40 in the center, and the second and third floor panels 20 are respectively the first. The connecting member 30 with each floor panel 20 of the above is rotated 90 ° inward to the left and right by its own weight. Here, the connecting portion 30a between the first floor panel 20 and the second floor panel 20 is locked. In this case, for example, the floor panels 20 can be locked to each other by attaching a stopper that regulates the rotation of the first and second floor panels 20.

Next, as shown in FIG. 18, the scaffolding body 10 is further lifted by the central first lifting machine 40, and as shown in FIG. 19, the chains 41 of the first lifting machines 40 on both the left and right sides are respectively 2 It is connected to the connecting member 30 between the first floor panel 20 and the third floor panel 20. Since the steps up to this point are performed in and above the yard 5, traffic restrictions on each lane 4 are not applied. However, in the preparatory work such as when connecting the first lifting machine 40 to the scaffolding main body 10, only one inner lane (yard 5 side) of each lane 4 is used as in the post-process shown in FIGS. 20 and 21. It is necessary to carry out partial regulation of traffic, but it does not lead to long-term traffic regulation because temporary short-term regulation is sufficient.

Subsequently, as shown in FIG. 20, the first floor panels 20 on both the left and right sides are rotated 90 ° upward so that the first floor panel 20 and the second floor panel 20 are horizontal. Move it. At that time, since the rotation of the first and second floor panels 20 is restricted, they are kept in a horizontal state with each other. Since this process is a work in a range including the upper part of one inner lane of each lane 4, traffic regulation is performed to partially regulate only one inner lane of each lane 4. The same applies to the subsequent steps.

Next, as shown in FIG. 21, each of the third floor panels 20 is manually rotated 90 ° upward so as to be horizontal, and is connected to the two main girders 1 on the left and right outer sides by suspension chains 60, respectively. To do. As a result, the scaffolding body 10 developed so that all the floor panels 20 extend horizontally in the direction perpendicular to the bridge axis is held directly under each main girder 1, and each connecting member 30 is held by a hanging chain, a hanging wire, or the like (not shown). A hanging scaffold is installed by connecting to each main girder 1.

After that, each of the first lifting machines 40 is moved to the next scaffolding installation position along the main girder 1. Then, a new suspended scaffold is installed by lifting and deploying the next scaffolding body 10 by the same process as described above, and the steps of connecting the scaffolding bodies 10 to each other are sequentially performed as in the first embodiment. , Install suspended scaffolding in the direction of the bridge axis.

As described above, according to the present embodiment, the rotation of the connecting portion 30a between some floor panels 20 is restricted in the step of lifting the scaffolding body 10, so that the connecting portion 30a is the first in the installation process. It is not necessary to connect the lifting machine 40, and the number of lifting points of each floor panel 20 can be reduced. As a result, the scaffolding main body 10 can be lifted and deployed by the three first lifting machines 40, and the installation work of the hanging scaffolding can be performed more efficiently.

In each of the above embodiments, a predetermined number of floor panels 20 are connected by the connecting member 30, but as shown in FIGS. 22 to 26, the connecting member 70 that detachably connects the floor panels 20 to each other. May be used.

The connecting member 70 is composed of a pair of cylindrical members 71 into which the vertical frame 21 is rotatably inserted, as in each of the above-described embodiments, and each cylindrical member 71 is formed of a steel pipe having a length shorter than that of the vertical frame 21. Both ends of the vertical frame 21 in the axial direction are exposed to the outside from both ends of each cylindrical member 71. The cylindrical members 71 are detachably connected to each other via a pair of connecting portions 72, 73, and the connecting portions 72, 73 are formed so as to extend in the axial direction of the cylindrical members 71. The coupling portions 72 and 73 are provided with engaging portions 72a and 73b that engage with each other, one engaging portion 72a is formed in a convex shape, and the other engaging portion 72a is formed in a concave shape. .. In this case, protrusions 72b are provided on both sides of one engaging portion 72a in the width direction, and groove portions 73b are provided on both sides of the other engaging portion 73a in the width direction.

As shown in FIG. 25, each of the connecting portions 72 and 73 inserts one engaging portion 72a into the other engaging portion 73a from the axial direction, and slides the engaging portions 72a and 73b in the axial direction with each other. Engage. At that time, the protrusions 72b are fitted into the groove 73b, so that the joints 72, 73 are restricted from moving in the radial direction of the cylindrical member 71. Further, the movement of the joint portions 72, 73 in the axial direction can be regulated, for example, by fastening the joint portions 72, 73 to each other with bolts, or by using a dedicated stopper or the like. Although not shown, the connecting member 70 is provided with a hanging wire or a hanging ring for connecting the chain.

That is, by using the connecting member 70, the floor panels 20 can be detachably connected to each other, so that any number of floor panels 20 can be connected, and the length according to the installation site of the suspended scaffolding. The scaffolding body 10 of the above can be easily formed. In this case, the floor panels 20 may be connected in advance by the connecting member 70, or may be connected at the installation site.

It should be noted that each of the above-described embodiments is an embodiment of the present invention, and the present invention is not limited to that described in each of the above-described embodiments.

1 ... Main girder, 5 ... Yard, 10 ... Scaffolding body, 20 ... Floor panel, 30 ... Connecting member, 40 ... First lifting machine, 50 ... Second lifting machine, 70 ... Connecting member.

Claims (9)

In the hanging scaffolding installed by hanging from the bridge body
A suspended scaffolding characterized by having a scaffolding body formed so as to be foldable by rotating a plurality of floor panels rotatably connected to each other. The suspended scaffold according to claim 1, wherein the scaffold body is formed so as to be connectable to another scaffold body in the bridge axis direction. The suspended scaffold according to claim 1 or 2, wherein the floor panels are detachably connected to each other. In the installation method of the suspended scaffolding that is suspended from the bridge body,
Using a scaffolding body that is foldable by rotating a plurality of floor panels that are rotatably connected to each other.
Place the scaffolding body folded in the direction perpendicular to the bridge axis on the ground below the bridge,
A scaffolding body in a folded state is lifted toward the bridge body side and expanded so as to extend in the direction perpendicular to the bridge axis to form a suspended scaffolding extending horizontally in the direction perpendicular to the bridge axis. Installation method. 4. The fourth aspect of the present invention, wherein the scaffolding body folded so that the floor panels overlap each other in the thickness direction is arranged vertically so that the thickness direction of the floor panels faces the direction perpendicular to the bridge axis. How to install the hanging scaffolding. The fourth or fifth aspect of claim 4 or 5, wherein the central portion of the scaffolding body in the folded state in the direction perpendicular to the bridge axis is lifted, and the scaffolding body is extended from the center side in the direction perpendicular to the bridge axis toward the outside in the direction perpendicular to the bridge axis. How to install the hanging scaffolding. The method for installing a suspended scaffold according to claim 4, 5 or 6, wherein the rotation of a connecting portion between some floor panels is restricted in the step of lifting the scaffold main body. The suspension scaffold according to claim 4, 5, 6 or 7, wherein the suspension scaffolds are sequentially installed in the bridge axis direction by connecting a plurality of scaffold bodies extending in the direction perpendicular to the bridge axis in the bridge axis direction. Installation method. The method for installing a suspended scaffold according to claim 4, 5, 6, 7 or 8, wherein a scaffolding body in which the floor panels are detachably connected to each other is used.

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