JP5773469B1 - Suspended scaffolding - Google Patents

Abstract

[PROBLEMS] To provide a suspension scaffold that can be installed at a place of a viaduct having a roof in a railing and that can select an optimum installation place. A suspended scaffold 3 is installed on a viaduct 1 having a roof portion 5 that projects inward from the upper end of a rail 2. A plurality of suspension frames 7 and a scaffold plate 8 spanned between the suspension frames 7 are provided. The hanging frame 7 has an upper cross member 11 placed on the upper surface of the roof portion 5, and has a reinforcing plate 20 at a portion placed on the corner of the rail 2 and the roof portion 5. The top horizontal member 14 is fixed to the roof portion 5 with an upper reinforcing member 22 and a lower reinforcing member 23, and the top horizontal member 14 can be expanded and contracted in the width direction of the roof portion 5, The part which fixes the overhang | projection part 18 to the roof part 5 is selectable. [Selection] Figure 9

Description

  The present invention relates to a suspended scaffold suitable for use in work for repairing and inspecting viaducts such as railways and roads.

Repairs and inspections of viaducts such as railways and roads may extend to the outer surface of the railings (sound insulation walls) that stand at the end of the floor, the lower surface of the floor, and the bridge girder. Since such parts cannot be seen in detail from the bridge and work is difficult, it is usual to work using a gondola vehicle or rolling scaffold from the ground, or a scaffold stacked from the ground. However, suspension scaffolds are used when a gondola vehicle cannot enter or there is no room to build a scaffold due to the fact that there are buildings or structures on the ground at the site, or obstacles to traffic.
As a suspended scaffold, there exists a thing described in the following patent document 1, for example.

The suspension scaffold includes a vertical member, an upper horizontal member, an intermediate horizontal member and a lower horizontal member each having an end fixed to the vertical member, and a groove-like engagement portion provided on the lower surface of the front end portion of the upper horizontal member. A plurality of suspension frames are provided. And an engaging part is engaged with the upper end part of a hand rail, the suspension frame is hung from the outer hand of the hand rail at appropriate intervals, and scaffolding plates are constructed on the middle cross member and the lower cross member.
By the way, some viaducts have a roof portion projecting inward (road surface side) from the upper end of the railing. In the viaduct having such a roof portion, it is difficult to install the suspended scaffold as described in the above cited reference 1 because the groove-like engaging portion in the suspended scaffold cannot be hooked on the upper end of the railing. .

Japanese Patent No. 5090577

The problem to be solved by the present invention is to provide a suspension scaffold that can be installed on a portion having a roof portion when the viaduct has a roof portion that projects inward from the upper end of the rail. There are various sizes of the roof, and the positions of the roof reinforcement and roof reinforcement members necessary for safely installing the suspension scaffold are also various. In addition, it is also necessary for the suspension scaffold to have a structure in which the suspension frame is not easily deformed.
In the following description, the central side in the width direction of the viaduct is the inside, the opposite side is the outside, one side in the longitudinal direction of the viaduct is the right side, and the other side is the left side.

The present invention is a suspended scaffolding installed in a portion of the viaduct that extends from the upper end of the rail to the inside, and is suspended from the roof through the outside of the rail, and in the length direction of the viaduct. A plurality of suspension frames arranged at intervals in parallel with each other, and a scaffolding plate spanned between the suspension frames. The suspension frame has a vertical member and an outer end portion fixed to the vertical member. An upper cross member placed on the upper surface of the roof portion, and a scaffolding plate support cross member having an outer end fixed to the vertical member. The upper cross member is on a corner portion of the rail and the roof portion. A reinforcing plate is attached to the portion mounted on the upper side member, and is sandwiched between an upper reinforcing member straddling the upper surface of the upper cross member and a lower reinforcing member on the lower surface of the roof portion, and The upper crosspiece is fixed to the roof by joining with a fixed fixture. , The upper transverse member is characterized in that it is adjustable in length in the width direction of the roof.
Overhang portions are provided on both sides of the inner end portion of the upper cross member, the upper cross member has a T-shape in plan view, and the upper reinforcing member is disposed across the upper surfaces of the overhang portions on both sides.

  Alternatively, the present invention relates to a suspended scaffold that is installed in a portion of the viaduct where the roof portion projects inward from the upper end of the railing, and is suspended from the roof through the outside of the railing and in the length direction of the viaduct. A plurality of suspension frames arranged at intervals in parallel with each other, and a scaffolding plate spanned between the suspension frames. The suspension frame has a vertical member and an outer end portion fixed to the vertical member. An upper cross member placed on the upper surface of the viaduct roof, and a scaffolding plate support cross member having an outer end fixed to the vertical member, and the upper cross member is a corner between the rail and the roof portion. A reinforcing plate is attached to the portion placed on the part, and a hanging piece is fixed to the inner end, and the hanging piece is inserted into a through-hole formed in the roof portion of the viaduct, and The upper cross member may be adjustable in length in the width direction of the roof portion.

ADVANTAGE OF THE INVENTION According to this invention, a suspension scaffold can be installed by attaching a suspension frame firmly to the part which provided the roof part in the upper end of the railing in a viaduct.
Since the reinforcing plate is attached to a portion corresponding to the corner of the top rail and the roof portion, the upper cross member is difficult to be deformed by the weight of the suspended scaffold and the weight of the worker on the suspended scaffold.
The length of the upper cross member can be adjusted in the width direction of the roof according to the width of the roof, the reinforcing bars of the roof, or the position of the roof reinforcement. And can be attached firmly. Therefore, the scaffold work in the viaduct can be performed safely.

It is the perspective view which showed the basic structure 1 of the suspension scaffold which concerns on this invention. 1 is a side view of a basic structure 1. FIG. 2 is a plan view of a main part of the basic structure 1. FIG. 2 is a perspective view of a main part of the basic structure 1. FIG. 2 is a bottom view of the main part of the basic structure 1. FIG. 2 is a cross-sectional view of the main part of the basic structure 1. FIG. It is the principal part side view which showed the basic structure 2 of the suspension scaffold which concerns on this invention. FIG. 4 is a cross-sectional view of a main part of the basic structure 2. It is a principal part perspective view of the suspension scaffold which showed Example 1 of this invention. It is the principal part top view which showed the basic structure 3 of the suspension scaffold which concerns on this invention. 3 is a side view of a main part of a basic structure 3. FIG. It is the principal part side view which showed the basic structure 4 of the suspension scaffold which concerns on this invention. 3 is a plan view of a main part of a basic structure 4. FIG. It is a principal part perspective view of the suspension scaffold which shows Example 2 of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 9 show a first embodiment of the present invention. First, the basic structure (basic structures 1 and 2) of Example 1 will be described. As shown in FIGS. 1 and 2, a suspended scaffolding 3 (FIG. 1) is installed in a rail 2 of a viaduct 1 (FIG. 2). It is.
The rail 2 is erected on both sides in the width direction of the floor 4 of the viaduct 1, and a roof portion 5 projects from a part of the rail 2 toward the inside (center side of the floor 4) from the upper end. The roof part 5 has a thickness of about 100 mm, and the inside of the roof part 5 is arranged vertically and horizontally at intervals of 200 to 250 mm. The distance between the outer surface of the rail 2 and the inner end of the roof portion 5 is about 1 m, and corner reinforcing portions 6 are formed at the corners between the upper end inner surface of the rail 2 and the outer end lower surface of the roof portion 5. .

The suspension scaffold 3 installed in the part where the roof part 5 of the viaduct 1 projects is a plurality of suspension frames 7 suspended from the roof part 5 through the outside of the railing 2 and a scaffold spanned between the suspension frames 7. A connecting member 9 that joins the plate 8 and the suspension frame 7 is provided.
The suspension frames 7 are arranged at intervals of 900 mm to 1000 mm with respect to the length direction of the viaduct 1, and the vertical member 10, the upper horizontal member 11 that protrudes inward with the outer ends fixed to the vertical member 10, and the middle horizontal The connecting member 9 includes a member 12 and a lower cross member 13, and is fixed so as to cross the vertical member 10. The hanging frame 7 is made of a light and rust-resistant metal such as an aluminum alloy, and the connecting material 9 is a steel round pipe.

The vertical member 10 has a length that extends from the upper end of the rail 2 to the lower side of the floor 4, and is formed of a square pipe having a cross-sectional dimension of about 100 mm × 50 mm.
The upper cross member 11 arranges the top horizontal member 14 and the support horizontal member 15 with a space therebetween in the vertical direction, and connects the inner end portion of the support horizontal member 15 and the top horizontal member 14 with the vertical bundle 16. The frame structure has an oblique member 17 installed between the supporting horizontal member 15 and the top horizontal member 14.
The top horizontal member 14 has a length of about 1800 mm and a cross-sectional dimension of about 100 mm high × 50 mm wide, and its outer end is welded to the upper end surface of the vertical member 10. In addition, reinforcing plates 20 having a thickness of about 3 mm and a length of about 200 m are attached to both sides of the top horizontal member 14 from the attachment portion of the vertical bundle 16 to the inside. As shown in FIGS. 3 and 4, an overhanging portion 18 projecting on both sides is welded to the inner end surface of the top horizontal member 14, and the upper cross member 11 has a T shape in plan view. The overhang portion 18 has a cross-sectional dimension of about 100 mm in height × 100 mm in width.
As shown in FIG. 2, an adjustment screw member 19 a whose tip is in contact with the outer surface of the balustrade 2 projects from the inner end surface of the support horizontal member 15. The adjustment screw member 19a can change the protrusion amount by rotating in the forward and reverse directions.

The middle cross member 12 and the lower cross member 13 are scaffold plate supporting cross members on which the scaffold plate 8 is placed.
The intermediate cross member 12 has substantially the same length as the supporting horizontal member 15, and its outer end surface is welded to the inner side surface of the vertical member 10 in the longitudinal direction. An adjustment screw member 19b that abuts against the outer surface of the rail 2 is projected from the inner end of the middle cross member 12. The adjustment screw member 19b can change the protrusion amount by rotating in the forward and reverse directions.
The outer end surface of the lower cross member 13 is welded to the inner surface of the vertical member 10 at a position about 200 mm above the lower end of the vertical member 10. The length of the lower cross member 13 is about 1420 mm, which is longer than the middle cross member 12.
A support vertical member 21 is attached to the inner end of the lower cross member 13 so as to be able to rise and fall. An adjustment screw member 19c is provided on the upper end surface of the support vertical member 21 so as to adjust the protrusion amount by forward and reverse rotation. The upper end of the adjustment screw member 19c is brought into contact with the lower surface of the floor board 4. Further, the supporting vertical members 21 of the suspension frame are also connected by the connecting material 9.
And the scaffolding board 8 is spanned on the middle horizontal member 12 and the lower horizontal member 13 of the several suspension frame 7 arrange | positioned in the length direction of the viaduct 1, respectively.

The suspension frame 7 has the upper cross member 11 arranged in the width direction of the viaduct 1, and the portion to which the reinforcing plate 20 of the top horizontal member 14 is attached is placed on the corner of the rail 2 and the roof portion 5. The horizontal member 14 is attached to the viaduct 1 in a state where the inner portion and the overhanging portion 18 of the reinforcing plate 20 are placed on the roof portion 5 and the vertical member 10 is suspended from the outer side of the rail 2.
As shown in FIG. 3 and FIG. 4, the top horizontal member 14 and the overhanging portion 18 are respectively straddled on the two portions of the top horizontal member 14 placed on the roof portion 5 and the upper surfaces of both side portions of the overhanging portion 18. The upper reinforcing member 22 made of a metal strip is covered. As shown in FIG. 2, a lower reinforcing member 23 made of a metal plate is disposed below the top horizontal member 14 and below the overhanging portion 18 on the lower surface of the roof portion 5. Then, the upper reinforcing member 22 and the lower reinforcing member 23 are joined by bolts (fixing tools) 24 penetrating the roof portion 5 on both sides of the top horizontal member 14 and the overhanging portion 18, and the upper cross member 11. Is fixed to the roof portion 5. The fixing tool insertion hole 25 formed in the roof portion 5 for passing the bolt 24 is naturally provided at a position avoiding the reinforcing bar 26 inside the roof portion 5 (FIG. 5).

Since the upper cross member 11 fixed to the upper surface of the roof portion 5 is applied with a force to pull up the inner end portion, the upper reinforcing member 22 extends the bolt 24 across the top horizontal member 14 and the overhang portion 18. It only needs to have a size and strength that can be supported.
Therefore, in this embodiment, the size of the upper reinforcing material 22 that covers the top horizontal member 14 is 4.5 mm × 100 mm, and the size of the upper reinforcing material 22 that covers the overhanging portion 18 is 4.5 mm × 150 mm. Moreover, the through-hole 27 for letting the volt | bolt 24 pass is formed in the both ends of the upper reinforcement material 22 (FIG. 6).

On the other hand, the lower reinforcing member 23 has a size of about 200 mm × 400 mm and is disposed in a range straddling a plurality of reinforcing bars 26 inside the roof portion 5 as shown in FIG. That is, the lower reinforcing member 23 arranged below the top horizontal member 14 straddles the two reinforcing bars 26 arranged along the longitudinal direction of the viaduct 1 and is arranged below the overhanging portion 18. Is straddling two rebars arranged along the width direction of the viaduct 1. Therefore, even if the concrete of the roof portion 5 is temporarily damaged by the force of pulling the inner end portion of the top horizontal member 14 upward, the lower reinforcing member 23 is caught by the plurality of reinforcing bars 26, so that the upper cross member The inner end of 11 is not raised and the hanging frame 7 does not fall down.
In addition, through holes 27 ′ for passing bolts 24 are formed at the four corners of the lower reinforcing member 23 (FIG. 6).
In addition, since the safety | security increases when the lower reinforcement material 23 is arrange | positioned in the range which straddles many reinforcing bars 26, it is desirable to set it as a wider dimension, and the magnitude | size of about 500 mm x 500 mm so that the longitudinal and horizontal three reinforcing bars 26 may be straddled. It can also be.
The basic structure 1 is as described above.

The suspension scaffold 3 of the basic structure 1 is installed as follows.
First, a plurality of suspension frames 7 are prepared. The support vertical member 21 provided on the lower cross member 13 is brought down.
Next, a mark is provided at each position where the hanging frame 7 of the balustrade 2 is disposed, and the fixing tool insertion hole 25 is opened with a drill at a position avoiding the reinforcing bar 26 of the roof portion 5 using the mark as a guide.
Next, the hanging frame 7 is taken out from the inner side of the balustrade 2 with the vertical member 10 as the outer side, and the top horizontal member 14 of the upper cross member 11 is placed on the upper surface of the roof part 5 as shown in FIG. The reinforcing plate 20 mounting portion of the material 14 is placed on the corners of the rail 2 and the roof portion 5, and the tips of the adjustment screw member 19 a of the upper cross member 11 and the adjustment screw member 19 b of the middle cross member 12 are arranged on the outer surface of the rail 2 Abut.

The suspension frame 7 in this state is slid along the rail 2 and positioned at each mark location. Then, the top horizontal member 14 is disposed between the pair of left and right fixture insertion holes 25, and the overhang portion 18 is disposed between the pair of inner and outer fixture insertion holes 25.
Next, the upper reinforcing member 22 is placed on the top surface of the top horizontal member 14, bolts 24 are passed through the through holes 27 of the upper reinforcing member 22 and the fixture insertion holes 25 of the roof portion 5, and further on the lower surface of the roof portion 5. The lower reinforcing member 23 is applied so as to face the upper reinforcing member 22, the bolt 24 is passed through the through hole 27 ′ of the lower reinforcing member 23, and the nut 24 is tightened to fix the top horizontal member 14 to the roof portion 5. To do.
Further, the upper reinforcing material 22 is covered on the upper surfaces of both side portions of the overhanging portion 18, bolts 24 are passed through the through holes 27 of the upper reinforcing material 22 and the fixture insertion holes 25 of the roof portion 5, and the upper reinforcing material is applied to the lower surface of the roof portion 5. The lower reinforcing member 23 is applied so as to face 22, the bolt 24 is passed through the through hole 27 ′ of the lower reinforcing member 23, and a nut is fastened to the bolt 24 to fix the overhanging portion 18 to the roof portion 5.

Furthermore, the scaffolding plate 8 is placed on the lower cross member 13 of the suspension frame 7 arranged at equal intervals, and fixed with a wire. Next, the support vertical member 21 is raised and fixed, and the tip of the adjustment screw member 19 c provided at the upper end thereof is brought into contact with the lower surface of the floor 4.
Next, the scaffolding plate 8 is placed on the intermediate cross member 12 and fixed.
Further, the vertical member 10 and the supporting vertical member 21 of the hanging frame 7 are connected by the connecting member 9.
When the viaduct 1 and the suspension frame 7 are connected by the chain 28, the strength of the roof portion 5 is low, so the anchor bolt 29 is driven into the outer surface of the rail 2, and the anchor bolt 29 and the inner end of the lower cross member 13 are The chain 28 is bridged over (FIG. 2).
Further, when the reinforcement is not arranged inside the roof portion 5, the size of the lower reinforcing member 23 is set to an area sufficient to oppose the force that abuts the lower surface of the roof portion 5 and pulls up the bolt 24.

7 and 8 show a basic structure 2 of a suspended scaffold according to the present invention.
In the basic structure 2, an H-shaped steel 30 (shape member) is attached to the inner surface of the lower surface of the roof portion 5 along the longitudinal direction of the viaduct 1, and this H-shaped steel 30 serves as a lower reinforcing material. Further, the width of the projecting portion 18 in the inner and outer directions is the same as the width of the H-shaped steel 30 (100 mm).
The overhanging portion 18 of the upper cross member 11 is placed on the upper surface of the roof portion 5 so as to coincide with the H-shaped steel 30, and the upper reinforcing material 22 is placed on the upper surfaces of both side portions of the overhanging portion 18. Further, the bolt 24 is passed from above the upper reinforcing member 22 to the through hole 27 of the upper reinforcing member 22 and the fixture insertion hole 25 of the roof portion 5. Furthermore, a lower plate 31 having the same shape as the upper reinforcing member 22 is applied to the lower surface of the H-shaped steel 30 so as to face the upper reinforcing member 22, and the tip of the bolt 24 is passed through the through hole 27 of the lower plate 31. The upper cross member 11 is fixed to the roof portion 5 by tightening nuts into the bolts 24 below the lower plate 31.
Other structures are the same as those of the basic structure 1.

  In addition, without using the strip-shaped upper reinforcing material 22, the overhanging portion 18 is straddled from above with a U-shaped bolt that also serves as a fixing tool and the upper reinforcing material, and both ends of the fixing portion insertion hole 25 of the roof portion 5. The lower plate 31 is attached to the lower surface of the H-shaped steel 30, both ends of the bolt are passed through the through holes 27 of the lower plate 31, and both ends of the U-shaped bolt are nut-tightened below the lower plate 31. .

FIG. 9 shows a first embodiment of the present invention, in which the structure of the upper cross member 11 of the basic structure 2 is improved. As described above, the upper cross member 11 includes the top horizontal member 14 and the overhanging portion 18. In this embodiment, the top horizontal member 14 includes a main body portion 14a and a fitting portion 14b that is partially inserted into the main body portion 14a and integrated with a retaining bolt 36. The fitting portion 14b can be moved in and out in the axial direction (the width direction of the roof portion 5) with respect to the main body portion 14a, and the position thereof can be maintained by a retaining bolt. The said overhang | projection part 18 is being fixed to the inner end of the fitting part 14b. Therefore, the position of the overhang portion 18 can be adjusted in the width direction of the roof portion 5. The procedure for attaching the upper cross member 11 to the roof portion 5 and the structure for attaching the overhang portion 18 to the roof portion 5 are the same as described in the basic structure 2.
With this structure, in the first embodiment, the overhanging portion 18 can be disposed at an arbitrary position in the width direction of the roof portion 5, and the overhanging portion is matched to the position of the reinforcing bar or the reinforcing shape member (H-shaped steel 30) in the roof portion 5. 18 can be fixed to an optimum place. As a result, it is possible to ensure the safety of the suspension scaffold by eliminating excessive fixing and unstable mounting.
In addition, although Example 1 is based on the basic structure 2, even if it is the said basic structure 1, the same effect can be acquired by making the top horizontal member 14 extendable and contractible.

10 and 11 show the basic structure 3 according to the present invention.
In the basic structure 3, the protruding portion 18 is not provided at the inner end of the top horizontal member 14. Further, a round pipe 32 a serving as an upper reinforcing material is bridged along the longitudinal direction of the viaduct 1 between the upper surfaces of the inner end portions of the top horizontal member 14 of the suspension frame 7 arranged in plural, and the lower reinforcement of the roof portion 5 is provided on the lower surface. The round pipe 32b used as a material is arranged so as to face the round pipe 32a, and both ends of a steel wire (fixing tool) 33 wound around the upper and lower round pipes 32a and 32b through the fixing tool insertion hole 25 of the roof portion are bound. The upper cross member 11 is fixed to the roof portion 5.
Other structures are the same as the basic structure 1 described above.

12 and 13 show the basic structure 4 of the present invention.
In the basic structure 4, the top horizontal member 14 of the hanging frame 7 has a length (about 1500 mm) at which the inner end reaches slightly inside the corner reinforcing portion 6. Further, a short hanging piece 34 is fixed to the lower surface of the inner end portion of the top horizontal member 14, and one end portion of the chain 28a is attached to the lower end portion of the hanging piece 34 (FIG. 12).
At the position where the suspension frame 7 is installed, a through hole 35 is formed inside the corner reinforcing portion 6 of the roof portion 5 so as to avoid the reinforcing bars 26 (FIG. 13). The through hole 35 has a size slightly larger than the cross section of the hanging piece 34.

Then, the top horizontal member 14 of the hanging frame 7 is placed on the upper surface of the roof portion 5, the hanging piece 34 is inserted into the through hole 35 of the roof portion 5 from above, and the upper cross member 11 is attached to the roof portion 5. Further, the suspension frame 7 is firmly fixed to the viaduct 1 by sandwiching the corner portions of the rail 2 and the roof portion 5 with the adjusting screw member 19a of the upper cross member 11 and the hanging piece 34. Then, the chain 28 a attached to the hanging piece 34 is connected to the viaduct 1 side inside the rail 2.
Therefore, a fixing tool such as a bolt, an upper reinforcing material, a lower reinforcing material, and the like for fixing the upper cross member 11 to the roof portion 5 are unnecessary.
Other structures are the same as the basic structure 1.

In the basic structure 1 and the basic structure 2, the upper reinforcing member 22 is not formed into a flat band plate shape, but is an inverted U shape that covers the upper surface and both side surfaces of the top horizontal member 14 or the overhang portion 18 by bending the band plate. It can also be made into the shape which extended the flange for bolt insertion in the both ends. FIG. 14 shows an example. The upper reinforcing member 22a has an inverted U shape that covers the upper surface and both side surfaces of the top horizontal member 14, and a bolt 24 is inserted through the flange-like protruding portion to form a H-shaped steel on the lower surface side. 30 and the lower reinforcing member 23 are fixed. Reference numeral 36 denotes a retaining bolt for preventing the top horizontal member 14 from moving in the width direction of the roof portion 5.
Even with this structure, the suspension scaffold 3 can be safely secured to the balustrade 2 by adjusting the position of the upper reinforcing member 22a according to the position of the reinforcing bar inside the roof portion 5 and the position of the reinforcing shape member (H-shaped steel 30). And can be attached firmly.

DESCRIPTION OF SYMBOLS 1 Viaduct 2 Handrail 3 Suspension scaffold 4 Floor board 5 Roof part 6 Corner reinforcement part 7 Suspension frame 8 Scaffold board 9 Connecting material 10 Vertical member

11 Upper cross member 12 Middle cross member (Staff support cross member)
13 Lower cross member (scaffold plate support cross member)
DESCRIPTION OF SYMBOLS 14 Top horizontal material 15 Support horizontal material 16 Vertical bundle 17 Diagonal material 18 Overhang | projection part 19a, 19b, 19c Adjustment screw member 20 Reinforcement board

21 Support vertical member 22, 22a Upper reinforcement 23 Lower reinforcement 24 Bolt (fixing tool)
25 Fixing tool insertion hole 26 Reinforcing bar 27 Through hole 28, 28a Chain 29 Anchor bolt 30 H-shaped steel

31 Lower plate 32a, 32b Round pipe 33 Steel wire (fixture)
34 Suspended piece 35 Through hole 36 Retaining bolt

Claims (2)

In the viaduct, it is a suspended scaffolding installed on the part where the roof part protrudes inward from the upper end of the railing, and is suspended from the roof part through the outside of the railing, and in parallel along the length direction of the viaduct A plurality of suspension frames arranged at intervals, and a scaffold plate spanned between the suspension frames, the suspension frame having a vertical member and an outer end fixed to the vertical member, the roof portion An upper cross member placed on the upper surface, and a scaffolding plate support cross member having an outer end fixed to the vertical member, and the upper cross member is placed on a corner portion between the rail and the roof portion. A fixing device having a reinforcing plate attached and sandwiched between an upper reinforcing material straddling the upper surface of the upper cross member and a lower reinforcing material on the lower surface of the roof portion, and passing the upper reinforcing material and the lower reinforcing material through the roof portion. The upper cross member is fixed to the roof portion by bonding with
The upper cross member includes a top horizontal member and an overhang portion,
The top horizontal member is composed of a main part and a fitting part partially inserted into the main part,
The fitting part is allowed to enter and exit in the width direction of the roof part with respect to the main part and maintain its position,
The overhanging portion is fixed to the inner end of the fitting portion, and the top horizontal member is formed into a T-shape in plan view.
The suspension scaffold characterized in that the position of the overhanging portion can be adjusted in the width direction of the roof portion with respect to the outer end of the top horizontal member. In the viaduct, it is a suspended scaffolding installed on the part where the roof part protrudes inward from the upper end of the railing, and is suspended from the roof part through the outside of the railing, and in parallel along the length direction of the viaduct The suspension frame includes a plurality of suspension frames arranged at intervals, and a scaffold plate spanned between the suspension frames. The suspension frame has a vertical member and an outer end fixed to the vertical member. An upper cross member placed on the upper surface of the roof portion and a scaffolding plate support cross member having an outer end fixed to the vertical member, and the upper cross member rests on a corner of the rail and the roof portion. A reinforcing plate is attached to the part, and a hanging piece is fixed to the inner end, and the hanging piece is inserted into a through hole formed in the roof portion,
The suspension scaffold characterized in that the position of the hanging piece can be adjusted in the width direction of the roof portion with respect to the outer end of the top horizontal member.

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