JP2001159234A - Construction method for suspended scaffold and sleeper member for suspended scaffold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for constructing a suspended scaffold safely at a low construction cost without requiring a large-scale machine. SOLUTION: A plurality of main wires 12 are stretched on a structure in advance along the horizontal direction for constructing the suspended scaffold at a place higher in height than the place of the structure where the suspended scaffold is to be constructed. A small lift device 11 is movably suspended on each main wire 12 via a fitting metal 35, and the small lift device 11 is arranged in the front of an existing sleeper member 33 at the tip of a scaffold constructed prior to the suspended scaffold by one span. A sleeper member 13 is hoisted from the ground by a suspension wire 34 delivered from the small lift device 11, and a floor joist 37 is arranged between the sleeper member 13 and the existing sleeper member 33 to form a lattice frame. The sleeper member 13 hoisted by the small lift device 11 is fitted to the structure by a suspension material, then the suspension wire 34 of the small lift device 11 is removed, and the suspended scaffold is constructed by one span when a floor material is mounted on the lattice frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a suspended scaffold to be attached to a bridge or other structures, and to a structure of a large pulling material for a suspended scaffold which is most suitable for adopting the method.

[0002]

2. Description of the Related Art Conventionally, in order to construct a suspension scaffold used for repainting of a bridge or the like or exterior construction of a structure, a work floor assembled on a safe ground in advance is lifted to a predetermined height by a large heavy machine. In addition, a method has been adopted in which a worker riding an aerial work vehicle attaches a suspension chain to a girder member of a structure or the like at appropriate intervals, and fixes the work floor to the suspension chain.

However, this method cannot be adopted when a space for assembling a work floor cannot be secured on the ground or when an aerial work vehicle cannot be used due to the location.

In such a case, a so-called conventional construction method is adopted in which a small-scale scaffold is set in a high place such as a girder material, and a worker assembles a hanging scaffold little by little on the scaffold. become. In such a conventional construction method,
The skilled worker had to perform dangerous work, and the assembly work also required a lot of time.

A method of constructing a suspension scaffold used for repainting a bridge or the like by a conventional construction method will be described below.

FIGS. 1 to 5 are schematic views showing a procedure for constructing a suspended scaffold of a bridge by a conventional construction method.

First, as shown in FIG. 1, a steel material 3 is transferred to lower flanges 2 and 2 of main bridges 1 and 1 on the left and right sides of a bridge, and a scaffold plate 4 is laid on the steel material 3 and Performs the assembly operation on the scaffold plate 4. First, the worker takes a forward bent posture, and attaches a required number of loop-shaped hanging chains 5 to the lower flange portions 2, 2 of the main beams 1, 1 via the attachment clamps 6.

[0008] Next, as shown in FIG. 2, from the top of the pier 7 to the loop-shaped portions of the suspension chains 5, 5,. Pass the parent pipes 8,8.

After passing through the left and right parent pipes 8, 8, a collapsible pipe 9 connecting the left and right parent pipes 8, 8 is attached as shown in FIG. The joint between the parent pipe 8 and the collapsible pipe 9 is firmly fixed with a fastener 10. In this case, the worker rides on the parent pipe 8 or the collapsible pipe 9 and works in an unstable state, so that the worker is limited to a skilled worker.

After the collapsible pipe 9 has been attached to the parent pipe 8, as shown in FIG. 4, the scaffold plate 4 is laid on the colovasi pipe 9 with a gap between the scaffold plates 9 so that the work can be easily performed. It is tied to the colovasi pipe 9.
Next, the hand is reached from the gap between the scaffold plates 4 and the left and right ends of the fall prevention net 11 are tied to the parent pipe 8 or the collapsible pipe 9 with a string.

When the fall prevention net 11 has been set up, FIG.
As shown in the figure, the scaffolding plate 4 is spread over the entire surface of the colovasi pipe 9 without any gap, and a flameproof sheet (not shown) is stretched over the entire surface of the scaffolding plate 4 by nailing and cured to complete the suspension scaffold. I do.

[0012]

As described above, conventionally, when constructing a suspension scaffold to be attached to a bridge or other structures, a large area such as a large heavy machine and an aerial work vehicle is used. Was completed all at once, or by a skilled person working hand-in-hand at high altitudes to complete the scaffolding without relying on machinery.

However, when using large heavy equipment and aerial work vehicles, it is necessary to secure a space for assembling the work floor on the ground. Did not. In addition, costs such as machine leasing and operating costs have led to high costs for temporary construction of the scaffold.

[0014] On the other hand, the conventional construction method has an advantage that work can be performed at any place because of manual work, and since no machine is used, there is no need for a machine leasing fee or operating cost. However, as in the construction procedure described above, in the conventional construction method, the assembling work must be performed in an unstable position in an unstable place, and the work cannot be performed by a skilled person who works in high places. In addition, it is difficult to secure human resources, and much time is required for assembling work, resulting in high costs due to labor costs.

Further, in the conventional construction method, there are situations in which a working vehicle at a height cannot be used, and it is sometimes impossible to establish a safety rope for catching a safety belt for protecting workers. However, there were many problems in terms of safety management.

Accordingly, an object of the present invention is to provide a method capable of reducing a construction cost without requiring a large-scale machine and constructing a suspended scaffold in a safe working environment.

Another object of the present invention is to provide an optimum suspension scaffolding material in adopting the method of constructing a suspended scaffold which is the object of the above-mentioned problem.

[0018]

Means for Solving the Problems In order to achieve the object, the invention according to claim 1 comprises a plurality of large pulling members supported by hanging members hanging from a structure and arranged in parallel with each other;
In the method of constructing a suspended scaffold comprising a joist laid between the large pulling materials and a floor material placed on a lattice frame formed by the large pulling material and the joist, a height at which a suspending scaffold of the building is constructed A plurality of main wires are stretched in advance to the structure along the horizontal direction where the hanging scaffold is constructed at a high position, and the small lifting device is moved to each of the main wires via a mounting bracket. The small lifting device is suspended from the small lifting device so that the small lifting device can be placed one span ahead of the existing large pulling material at the tip of the scaffold constructed before the hanging scaffold. A large pulling material is lifted from the ground by a hanging wire to be suspended, a joist is laid across the large pulling material and the existing large pulling material to form a lattice frame, and then the large pulling material is lifted by the small lifting device. Is attached to the structure with the hanging material A hanger wires of the small lifting device, by placing the flooring to the lattice frame body 1
It is characterized by the construction of a suspended scaffold for each span.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the small lifting device is a lifting device in which a motor and a winding drum for winding a suspension wire are integrated. A main body, a mounting bracket for suspending the lifting device main body to the main wire, and a hanging hook provided at a tip of the hanging wire, wherein the mounting bracket has a load applied to the hanging hook. In addition, when a load is applied to pull the lifting device body downward, the hanging position of the main wire is fixed immovably, the load on the hanging hook is removed, and the lifting device body is pulled downward. In a state where no applied load is applied, the main wire has a structure in which a hanging position of the main wire is movable.

The invention described in claim 3 is the first or second invention.
In addition to the configuration described above, the large pulling material is a large pulling material corresponding to the width of a hanging scaffold to be connected and constructed by abutting a plurality of large pulling material elements in a longitudinal direction thereof, and connecting the connecting portion to the large pulling material. An outer wrapping member having an inner cross section larger than the outer shape of the cross section of the element and having a reinforcing arm toward the center of each of the large drawing elements with the opposite end faces of the large drawing elements as the center is provided. It is characterized by:

According to a fourth aspect of the present invention, there is provided a large attracting material used in the method of constructing a suspended scaffold according to any one of the first to third aspects, wherein the length of the large attracting material is set to a plurality of large attracting elements. Corresponding to the width of the hanging scaffold to be connected and constructed in the longitudinal direction thereof, and having a connection portion having an internal cross section larger than that of the cross section of the large drawing material element and facing the large drawing material element. It is characterized in that it is reinforced by an outer wrapping member provided with a reinforcing arm portion centered on the end surface of each large pulling material element toward the center portion.

[0022]

Embodiments of the present invention will be described below.

FIG. 6 is an explanatory view showing the movement of the small lifting device when a hanging scaffold is constructed on a bridge.

When the method for constructing a suspended scaffold according to the present invention is applied, the main girder on the lower surface of the bridge is firstly provided between the pier 7 on the near side (the right side in the drawing) and the pier 8 on the front side (the left side in the drawing). A main wire 12 for suspending the small lifting device 11 is stretched along the inside of 1. At this time, the main wire 12 is stretched at a position separated from the inner surface of the main girder 1 by a predetermined distance so that the small lifting device 11 does not contact the lower flange portion 2 of the main girder 1.

The main wire 12 includes a pair of left and right main girders 1,
One small wire lifting device 11 is suspended from one main wire 12 inside each wire. Therefore, as shown in FIG. 7, one large pulling material 13 is lifted by the left and right small lifting devices 11.

The large catch 13 is formed by connecting the large catch elements 14 facing each other in the longitudinal direction to form a long large catch, and assembling to a required length on the ground before lifting. It is something that can be done.

Next, the structure of the large attracting material, which is an aggregate of the large attracting material elements, will be described.

FIGS. 8 to 11 show the state of attachment of the large pulling material and the outer casing member.

FIG. 8 is an exploded perspective view showing a state in which the outer casing member is attached to the large attracting element. FIG. 9 is a view in which a new large attracting element is attached to the large attracting element to which the outer casing member is attached. It is the disassembled perspective view which showed the state.

FIG. 10 is a cross-sectional view of the connecting portion of the large pulling material, and shows a state where the joists are hung on the large pulling material. FIG. 11 is a front view of the connecting portion of the large drawing material.

The large attracting element 14 has a substantially lip groove-shaped cross section in which a single opening 14b is formed in the center of the upper surface of the element body 14a. On the element body 14a, shaft members 31 for connecting the substantially lip groove-shaped opposed wall surfaces are fixed at predetermined intervals, and a suspending metal fitting 30 used for reinforcing the large attracting element 14 and suspending the large attracting material 13 is provided. It can be locked and fixed to the shaft member 31.

As shown in FIG. 10, a pair of reinforcing ribs 14c, 14c are provided in the opening 14b so that the tip 15a of the joist 15 can be locked.

The large attracting element 14 has an end plate 14d at both ends of the element body 14a. The end plate 14d has two vertical surfaces 14e and 14f having steps.
Are connected by an inclined surface 14g, and each vertical surface 14e is provided with a projection 14h and a hole 14i.

The end plate 14d is a pair of structures in which the ends of the large attracting elements 14, 14 to be connected can abut against each other.
Opposing projections 14h are fitted into the respective holes 14i so that positioning can be performed with a single touch.

The connecting means of the large drawing material element 14 includes two
Connecting bolt 16 penetrating through the inclined surfaces 14g, 14g from above and a nut 14 fixed inside the lower inclined surface 14g
j, and the connecting bolt 16 is connected to the element body 14a.
Screw from above using the opening 14b of the nut 1
4j so that it can be fixed firmly.

The compressive load in the axial direction acting on the large pulling element 14 is transmitted by the abutting surface of the end plate 14, and the tensile load is held by the tensile force of the connecting bolt 16.

Large attracting material 1 applied to the embodiment of the present invention
In order to simplify the work of assembling the suspended scaffold at a high place, it is desired that the length 3 is adjusted to the width of the required suspended scaffold. Therefore, the large attracting material 13 is
Are used by connecting a plurality of bridges in the longitudinal direction. Depending on the type of the bridge, there is a case where the distance between the main girders 1 and 1 for suspending the suspension scaffold is as large as 20 m. The deflection due to its own weight becomes considerably large.

In view of this, in the large attracting material 13 applied to the embodiment of the present invention, an outer wrapping member 17 for reinforcing the connecting portion is provided in addition to the connecting means described above.

In a state where the large engraving elements 14 are combined with each other, the outer package member 17
Has a larger inner cross section than the outer cross section of
Reinforcing arms 18 are provided around the facing end faces of the large attracting elements 14 toward the center of each large attracting element 14.

The reinforcing bowl portion 18 is provided with a bottom member 19 and wall members 20, which are erected at right angles from the left and right sides of the bottom member 19 and face each other.
20 and has a U-shaped cross section with an open top.

At a position slightly shifted from the center of the reinforcing bowl portion 18 in the longitudinal direction, a restraining member 21 for connecting both open ends across the open portion is integrally fixed. A nut 22 is fixed to the upper surface of the restricting member 21, and a push screw 23 that penetrates the restricting member 21 and is directed toward the inside of the bottom member 19 of the reinforcing bowl 18 is screwed into the nut 22.

A bolt mounting hole 25 through which a fixing bolt 24 penetrates is provided near one end of the wall members 20 on the side of the reinforcing bowl portion 18 to which the restraining member 21 is fixed.

The reinforcing bowl 18 on the side opposite to the bolt mounting hole 25
The pin mounting hole 2 through which the fixing pin 26 passes
7 are provided. The fixing pin 27 is connected to a part of the reinforcing bowl portion 18 by a chain 28 so as not to be lost.

Next, the working procedure of the method for constructing a suspended scaffold according to the embodiment of the present invention will be described.

Before starting the assembling work of the hanging scaffold, the large attracting members 13 are assembled such that the large attracting elements 14 have a required length on the ground.

The assembly of the large attracting material 13 is performed by assembling one large attracting material element 1.
4. Attach the outer wrapping member 17 to one end of the base 4 with a fixing bolt 24,
The other large pulling elements 14 are inserted from the opposite side of the outer wrapping member 17 so that the end faces of the large pulling elements 14 and 14 abut each other, and the connecting bolt 16 is screwed into the nut 14j to tighten the large pulling elements 14 and 14. The connecting pieces 14 are connected to each other, and the fixing pins 26 are inserted into the fixing pin holes 27 of the outer casing member 17 to engage the locking pieces 29 with the reinforcing ribs 14c of the main body 18. Finally, the set screw 23 is screwed into the large pulling element 14.
Is pressed against the inner surface of the outer casing member 17 so as to eliminate rattling between the large attracting element 14 and the outer casing member 17.

Therefore, when such a large attracting material 13 is used as a large attracting material for a suspended scaffold, one large attracting material 1 is used.
Even if it corresponds to the width of the hanging scaffold which requires a length of 3, the large pulling material element 1
4 are connected to each other by the outer casing member
Because it will be firmly fixed in a form that wraps the outer shape of
Sufficient rigidity to resist deflection due to its own weight is secured.

When the assembling of the large attracting material 13 is completed, a hanging metal fitting 30 for suspending the large attracting material 13 to a girder material such as the main girder 1 via a suspending material (suspending chain) 5 is attached to the large attracting material 13. Attach. The hanging bracket 30 is fixed to the shaft member 31 of the large pulling member 13 by hooking, and its mounting position is determined according to a predetermined interval calculated by a hanging load or the like.

Next, a procedure for attaching the assembled large pull material 13 to a girder material such as the main girder 1 of a bridge will be described.

In FIG. 6, first, in order to construct a suspended scaffolding over the entire lower part of a bridge or the like, a scaffold 32 for one span serving as a reference on the pier 7 at the starting position is used by using an aerial work vehicle or the like. Build it.

Then, based on the existing large pulling material 33 provided at the tip of the scaffold 32 constructed in advance,
The main wire 12 stretched on the left and right main girders 1 and 1 so that the new large pulling material 13 comes forward by one span (usually 900 mm to 1800 mm) P in the direction of constructing the hanging scaffold. , 12 are set at the positions of the small lifting devices 11, 11.

In order to set the small lifting devices 11 and 11 in a predetermined position, the suspension wires 3 of the small lifting devices 11 and 11 are used.
After confirming that no load is applied to 4, the fittings 35 of the small lifting devices 11, 11 are pushed forward by a ruler (single pipe with a mark) defining one span. Then, it may be moved on the main wires 12, 12.

Next, the hanging hooks 36 attached to the tips of the hanging wires 34 of the left and right small lifting devices 11, 11 are lowered to the ground, and the shaft members near both ends of the large pulling material 13 placed on the ground. The hook 31 is hooked on the hook 31 to be lifted.

As shown in FIG. 12, the new large pulling material 13 is lifted to a position slightly higher by H than the height of the existing large pulling material 33. In this state, the large lifting material 1
3 and the existing large timber 33 of the scaffold 32 built in advance
And a plurality of joists 37, 37,.
... As a result, a grid-like frame is formed by the large pulling material 13, the joist 37, and the existing large pulling material 33, so that the large pulling material 13 suspended by the small lifting devices 11, 11 is stabilized.

Thereafter, as shown in FIG. 13, the scaffold plate 4 is moved from the previously constructed scaffold 32 side to the large traction material 13 side.
, And moved to the side of the large pulling material 13 lifted by the worker, and the hanging metal fittings 30 previously attached to the large pulling material 13
Of the hanging material (hanging chain) 5 and the mounting clamp 6 of the hanging material (hanging chain) 5
To the lower flange 2 of

When the large pulling material 13 is attached to the girder 38 by the hanging material (hanging chain) 5, the hanging wires 34 of the small lifting devices 11 and 11 are slowly lowered, and the large pulling material 13 is lowered.
The hanging hook 36 is removed from the shaft member 31 of FIG. In this state, the height of the existing large attracting material 33 matches the height of the newly attached large attracting material 13.

After that, if a flooring material such as the scaffolding board 4 is laid on a grid-like frame composed of the large pulling material 13, the joist 37 and the existing large pulling material 33, the working floor 39 having no gap is formed. Complete.

Thereafter, by repeating the same operation sequentially in the direction to be constructed, a desired suspension scaffold can be constructed between the bridge girders.

Note that, by going through the reverse procedure, the hanging scaffold can be easily disassembled.

Here, the case of constructing the suspension scaffold provided on the lower surface of the bridge has been described, but the present invention is not limited to this, and other suspension scaffolds used for construction of structures both outdoors and indoors Can be applied to the case of construction.

Next, a small lifting device used in the embodiment of the present invention will be described.

FIG. 14 is a perspective view showing a state where the small lifting device is suspended from the main wire.

The small lifting device 11 includes a motor (not shown)
And a winding drum 40 for winding the suspension wire 34
The lifting device main body 41 is integrally formed, a mounting bracket 35 for suspending the lifting device main body 41 on the main wire 12, and a hanging hook 36 provided at the tip of the hanging wire 34. .

When a load is applied to the hanging wire 34 and a load is applied to the lifting device main body 41 downward, the hanging position of the main wire 12 is fixed immovably. When the load applied to the main wire 12 is removed and no load is applied to pull the lifting device body 41 downward, the hanging position of the main wire 12 is movable.

FIG. 15 is a partially sectional explanatory view showing the structure of the mounting bracket of the small lifting device.

The mounting bracket 35 includes a U-shaped mounting body 42 having a U-shaped cross section straddling the main wire 12, and a suspension arm which is inserted into the U-shaped groove 43 of the mounting body 42 and is pivotally mounted on the mounting body 42. 44. The upper part of the suspension arm 44 is provided with a locking tooth 45 facing the U-shaped groove 43 of the mounting body 42, and the main wire 12 is provided between the U-shaped groove 43 and the locking tooth 45. There is a gap that can be inserted.

The lower part of the suspension arm 44 is the small lifting device 1
Hook portion 4 having a hanging hole 46 for hanging 1
When a heavy load is hooked on the hook portion 47 and a load W is applied, a counterclockwise rotation moment about the rotation shaft 48 is generated.

For this reason, the portion of the locking teeth 45 on the upper part of the suspension arm 44 moves in the direction of the arrow (counterclockwise) shown in FIG. Will be closer to the groove 43 of FIG. As a result, the locking teeth 45 bite into the main wire 12 sandwiched between the U-shaped groove 43 of the mounting body 42 and the locking teeth 45, and the mounting bracket 35 cannot move with respect to the main wire 12. State.

When only the small lifting device 11 is hung on the suspension arm 44 and no load is applied to the hanging wire 34 of the small lifting device 11, the rotation moment acting on the locking teeth 45 is small. Acting on the small lifting device 11
Does not move from the current position on the main wire 12.

In this state, if the hook portion 47 of the mounting bracket 35 is pushed forward from the near side with a pipe-like material along the longitudinal direction of the main wire 12 (from right to left in FIG. 15). Movement), the lower part of the suspension arm 44 moves clockwise to release the rotational moment acting on the locking teeth 45, so that the mounting bracket 35 can move forward on the main wire 12.

[0071]

As described above, according to the method for constructing a suspended scaffold according to the first to third aspects of the present invention and the large pulling material for a suspended scaffold according to the fourth aspect of the present invention, a large scale is provided. The construction cost can be reduced without the need for a simple machine, and the hanging scaffold can be constructed in a safe working environment (hereinafter, referred to as a first effect).

According to the second aspect of the present invention, the first
In addition to the above-mentioned effects, the assembly work for each span can be quickly performed only by hand without requiring any special equipment for moving the small lifting device.

According to the third aspect of the present invention, the first
In addition to the above-mentioned effects, it is possible to lift large pulling materials at a time corresponding to the required width of the hanging scaffolding, which simplifies the work for each span and makes dangerous work such as assembling large pulling elements at high places. Work can be done safely.

According to the fourth aspect of the present invention, it is possible to easily cope with the width of a hanging scaffold that requires the length of one large pulling material 13 on site, The rigidity of the connection portion against deflection due to its own weight is sufficiently ensured.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an operation of attaching a suspension chain to a suspension scaffold of a bridge by a conventional method.

FIG. 2 is a schematic perspective view showing an operation of attaching a parent pipe to a suspension scaffold of a bridge by a conventional method.

FIG. 3 is a schematic perspective view showing an operation of attaching a columbashi pipe to a suspension scaffold of a bridge by a conventional method.

FIG. 4 is a schematic perspective view showing an operation of attaching a fall prevention net to a suspension scaffold of a bridge by a conventional method.

FIG. 5 is a schematic perspective view showing a state before attaching a flameproof sheet to a suspension scaffold of a bridge by a conventional method.

FIG. 6 is an explanatory diagram showing the movement of the small lifting device when constructing the hanging scaffold according to the embodiment of the present invention.

FIG. 7 is a perspective view showing a state in which a large lifting material is lifted by the small lifting device when the lifting scaffold according to the embodiment is constructed. It is.

FIG. 8 is an exploded perspective view showing a state in which the outer casing member is attached to the large attracting element of the large attracting material according to the embodiment.

FIG. 9 is an exploded perspective view showing a state in which a new large attracting element is attached to the large attracting element to which the outer packet member is attached in the large attracting material according to the embodiment.

FIG. 10 is a cross-sectional view of a connecting portion of the large pulling material, showing a state in which the joist is hung on the large pulling material according to the embodiment.

FIG. 11 is a front view of a connecting portion of the large pulling material according to the embodiment.

FIG. 12 is a perspective view showing an assembling state of a joist when constructing the hanging scaffold according to the embodiment.

FIG. 13 is a perspective view showing a work of hanging a large pulling material on a girder member when constructing the hanging scaffold according to the embodiment.

FIG. 14 is a perspective view showing a state in which the small lifting device used in the method for constructing a suspended scaffold according to the embodiment is suspended on a main wire.

FIG. 15 is an explanatory diagram of a partial cross section showing a structure of a mounting bracket of the small lifting device used in the method of constructing a hanging scaffold according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main girder 2 Lower flange part 4 Scaffolding board (floor material) 5 Suspension chain (hanging material) 6 Mounting clamp 11 Small lifting device 12 Main wire 13 Large drawing material 14 Large drawing material element 17 Outer wrapping member 30 Suspension fitting 31 Shaft material 32 Scaffolding 33 Existing large pulling material 34 Hanging wire 35 Mounting bracket 36 Hanging hook 37 Joist 38 Girder material

Claims (4)

[Claims] 1. A plurality of large pull members supported by a hanging material hanging down from a structure and arranged in parallel, joists transversely arranged between the large pull members, and the large pull materials and the joists are formed. In the method of constructing a suspended scaffold comprising a floor material placed on a lattice frame, a height of the suspended scaffold of the building is set higher than a height at which the suspended scaffold is constructed. A plurality of main wires are stretched on an object, and a small lifting device is movably suspended on each of the main wires via a mounting bracket, and is provided at a tip of a scaffold constructed prior to the suspended scaffold. The small lifting device is disposed one span ahead of the existing large pulling material, and the large pulling material is lifted from the ground by a suspension wire fed from the small lifting device, and the large pulling material and the existing large pulling material are lifted. Form a lattice frame by laying joists between the timbers After that, the large lifting material lifted by the small lifting device is attached to the structure with the lifting material, and then the hanging wires of the small lifting device are removed, and the floor material is placed on the lattice frame. A method for constructing a suspended scaffold, wherein the suspended scaffold is constructed one span at a time. 2. The small lifting device according to claim 1, wherein the lifting device has a motor and a winding drum for winding the lifting wire, and a lifting device for hanging the lifting device from the main wire. It consists of a mounting bracket and a hanging hook provided at the tip of the hanging wire, wherein the mounting bracket is configured such that when a load is applied to the hanging wire and the load that pulls the lifting device body downward is applied. The hanging position of the main wire is fixed so as not to be movable, the load on the hanging wire is removed, and the lifting position of the main wire is movable in a state where no load is applied to pull the lifting device body downward. The method for constructing a suspended scaffold according to claim 1, wherein the method comprises: 3. A large pulling material corresponding to a width of a hanging scaffold to be constructed by connecting and connecting a plurality of large pulling elements in a longitudinal direction of the large pulling material element, wherein a connecting portion of the large pulling material is connected to the large pulling material element. Having an inner cross section larger than the outer shape of the cross section of the above, and reinforced by an outer wrapping member provided with a reinforcing arm portion toward the center of each of the large drawing elements around the opposite end faces of the large drawing elements. The method for constructing a suspended scaffold according to claim 1 or 2, wherein: 4. A large catch used in the method of constructing a suspended scaffold according to claim 1, wherein a length of the large catch is determined by abutting a plurality of large catch elements in the longitudinal direction thereof. Corresponding to the width of the hanging scaffold to be connected and constructed, the connecting portion has an inner cross section larger than the outer cross section of the large attracting element, and each of the connecting portions is centered on the facing end face of the large attracting element. A large scaffold for a suspended scaffold, wherein the scaffold is reinforced by an outer wrapping member provided with a reinforcing arm toward a center of the catching element.