JPH1113275A - Aerial expansion type suspended scaffold and its construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aerial expansion type suspended scaffold with high safety and efficient workability at a high place. SOLUTION: A wire pope 5 with a turn buckle is locked at one end thereof to the rear end of a master pipe 1 provided at the end of an existing suspended scaffold and locked at the other end thereof through a wire guide 33 for a suspension chain 4 suspending the master pipe 1 at this end of the end of a mater pipe 1a to be next connected thereto. After the master pipe 1a is connected thereto, it is mounted with a sleeper 6, a plywood panel 7 is placed thereon, a new suspension chain 4a is mounted at the end and connected to an upper structure G and the turn buckle 53 is loosened to carry the master pipe 1a onto the new suspension chain 4a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a suspension scaffold used as a work floor in a high place not supported from below such as a bridge construction site (hereinafter referred to as aerial),
The present invention relates to an aerial-expandable suspension scaffold capable of sequentially expanding its floor surface and a construction method thereof.

[0002]

2. Description of the Related Art Although there are structures such as piers above a work site, such as when painting a bridge girder erected at a bridge construction site, or when repairing or repainting an existing bridge, there is a structure such as a pier. In high places where there is no support for the work floor, a so-called hanging scaffold is erected. Although there are various methods, the following four methods considered to be typical will be described below with reference to the drawings. 1) Wire bridge 2) Pipe suspended scaffold 3) Frame beam suspended scaffold 4) Panel suspended scaffold FIG. 11 shows an overall perspective view of the first wire bridge, and FIG. . P is a pair of piers at both ends of a span where a wire bridge is to be erected in this bridge, 60 is an anchor fitting fixed to the upper surface of the pier P with a chemical anchor or the like, and 61 is an anchor between the pair of piers at both ends by the anchor fitting 60. A plurality of main cables 62 extending in parallel with each other, a plurality of main cables 61, a scaffolding pipe called "roller" which is attached at a predetermined interval in a direction perpendicular to the main cable 61, 63 is a tip of each roll A stop pipe which is attached by connecting the rails, 64 is a handrail which is mounted vertically and spanwise to the roller, 65 is a scaffold plate which is mounted near the handrail 64, and which is mounted in the span direction on the roller 62, 66 is Roll 62
A safety net 67 is attached to the lower surface of the bridge by locking the four sides to a stop pipe 63. Reference numeral 67 denotes a suspension chain suspended from the main girder G of the bridge at an appropriate interval to support the main cable 61. .

As is clear from the above description, this wire bridge has a plurality of main cables 61 fixed at both ends to a pair of piers P, P by anchoring brackets 60, and is rolled at right angles to the main cables 61. Attach the safety net 66 on the lower surface and span rails on the upper surface
The work scaffold is constructed by installing the scaffolding board 64 and the scaffold board 65, but not only involves a great danger at the stage of initially stretching the main cable 61, but also when the span is large, it is lifted together with the hanging chain 67 in the middle. If not, there is a problem that the vicinity of the center hangs in a catenary shape and is greatly separated from the upper bridge.

FIG. 13 is a perspective view showing a construction procedure of the second pipe hanging scaffold, and FIG. 14 is a perspective view showing a completed state, which is common to FIGS. 11 and 12. Although the same reference numerals are used, reference numeral 68 denotes a parent pipe (also referred to as an “oyago”) replacing the main cable 61 in the wire bridge method. First, as shown in FIG. 13A, the suspension chains 67 are attached to the main girder G of the bridge at appropriate intervals.
Attach. Subsequently, the parent pipe 68 is passed between these suspension chains 67 as shown in FIG. Further, as shown in (c), the roller 62 is attached at right angles to the parent pipe 68 using a free clamp or the like. Further, as shown in (d), a scaffold plate 65 in the span direction is laid on the upper surface of the roller 62, and a safety net 66 is also provided on the lower surface of the roller 62. If necessary, a scaffold plate 65 is laid entirely without any gap as shown in FIG. FIG. 14 shows the completed state.

As can be seen from FIG. 13, this pipe hanging scaffolding method is a dangerous operation that requires a high level of skill at each stage of construction. Figure 3 is a perspective view of the third frame-type hanging scaffold.
See Figure 15. This suspended scaffold has a horizontal surface where a beam 70 and a girder 71 are assembled by welding, and a frame beam is welded and inserted into a parent pipe 68 by a mounting bracket 72, and a scaffold plate (floor material) 65 is laid on the upper surface. A work floor 69 and a protection work 74 which is made up of a construction site mounting bracket, a construction site, a curing net, etc., and is attached to the end of the work floor 69 via 73 without being installed, and is installed on a safe ground (not shown) Assemble on the work girder,
This is a construction method in which the assembled parts are collectively lifted to a predetermined height, erected, and then only the work girder is hung above the ground. Therefore, although the safety is remarkably improved, there is a disadvantage that it cannot be used when the ground portion directly below cannot be used for the assembly work due to the conditions of the construction site.

A fourth panel-suspended scaffold will be described with reference to FIGS. FIG. 16 is a perspective view showing a panel 75 used in this method, 76 is a cloth frame corresponding to a roller, 77 is a parent frame pipe corresponding to a parent pipe, and 78 is a parent frame pipe.
A connecting joint for connecting 77 to each other, and 65 is a flooring made of light alloy strips laid on the upper surface of the panel. The width of the panel 75 is 660 mm, and the length is 2000, 3000, or 3850 mm. On the other hand, reference numeral 79 in FIG. 17 denotes a start bracket provided with a fixed portion to the main girder G at the upper end of a vertical columnar body and a horizontal arm for mounting the panel 75 at the lower end.

[0007] Fig. 17 is a perspective view showing a procedure for constructing the panel suspension scaffold. As shown in Fig. 17 (a), first, a start bracket 79 is suspended from a lower flange of a main girder of a bridge. Subsequently, as shown in (b), a suspension chain 67a is attached to both ends of the first panel 75a, and the upper end thereof is also attached to the lower flange of the main girder, and the panel 75a is suspended and placed on the arm of the start bracket 79. . Continuing as shown in (c),
One hanging chain 67b attached to the second panel 75b
It is attached to the main girder lower flange about 300 mm in front of the panel 75a. This hanging chain as shown in (d)
A second panel 75b is attached to 67b, and the first panel 75a and the second panel 75b are connected by a connection joint 78 as shown in (e). The work floor is constructed by sequentially attaching and connecting the hanging chains and panels in the same manner.

[0008] This construction method has less danger of work than the first and second construction methods so far, and is not affected by lower conditions in construction, so there is no restriction as in the third construction method, but the installation is completed. Since it is necessary to attach a suspension chain to hang the body slightly from the top of the panel and suspend the next panel, it can not be attached too far away, and as mentioned above, place it about 300 mm forward. One work unit is 660m
m, which is problematic in that the work efficiency is poor.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the prior art and to realize an aerial expansion type suspended scaffold that can be constructed safely and efficiently.

[0010]

According to the present invention, there is provided an aerial expanding suspension scaffold according to the present invention, in which a main pipe suspended in a horizontal direction by a suspending chain attached to an upper structure at predetermined intervals is sequentially connected in a longitudinal direction. In this case, in the aerial expansion type suspension scaffold comprising a plywood panel mounted on the top of the roller, the suspension chain includes a wire guide that slidably locks a wire rope on a side surface. The parent pipe is suspended from the upper structure through a suspension fitting having a wire guide, and the parent pipe has a hole for locking a wire rope at a tip of a pipe body made of a steel pipe, and a hole for a bolt into which a connection bolt is inserted. A tip hook plate provided with a hole for locking the suspension chain, a hole for locking a wire rope at a rear end, and an overlap connected to the tip hook plate. A rear end hook plate provided with a hole for a bolt into which a connection bolt is inserted in a state where the connection bolt is inserted is mounted above the pipe main body, and a joint portion for sequentially connecting the pipe main body in the axial direction to both ends of the pipe main body. It is characterized by having.

The present invention also relates to a main pipe which is suspended in a horizontal direction by a suspension chain attached to an upper structure at a predetermined interval, and is sequentially connected in a longitudinal direction.
2. A method for constructing an aerial expansion type suspended scaffold according to claim 1, wherein a roll is attached at right angles to the roll, and a plywood panel is placed on top of the roll. One end of a wire rope with a turnbuckle is fixed to the rear end hook plate, and the other end is connected to the other end through a wire guide of a hanging metal fitting with a wire guide above a hanging chain hanging the tip of the parent pipe. After hooking on the hook plate on the tip side of the pipe, the rear end of the parent pipe to be connected next is connected to the tip of the parent pipe at the end of the existing hanging scaffold via the joint, and then a new connection is made Attach a right angle roller to this newly connected parent pipe while lifting and supporting the tip of the parent pipe with the wire buckle with the turn buckle, After placing the plywood panel on the part, attach a suspension chain to the tip of the newly connected parent pipe, connect it to the upper structure via a suspension fitting with a wire guide, and then attach the turnbuckle It is characterized in that the turnbuckle of the wire rope is loosened and the tip of the newly connected parent pipe is deposited in the suspension chain.

[0012]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 will be described later, FIG. 2 is a perspective view showing a connection state of a parent pipe 1 used in the present invention, and FIG. 3 is a front view of the same. The parent pipe 1 has a joint portion which is sequentially connected in the axial direction to a front end portion and a rear end portion of a pipe main body 10 obtained by cutting a steel pipe into a predetermined length. Is inserted into the rear end of the pipe body 10 of the next parent pipe 1a, so that it is optionally connected in the longitudinal direction. Hook plates are attached to both ends of the pipe body 10 upward, and holes 13, 14, 15 are provided in the tip hook plate 12 in order from the inside. The rear end hook plate 16 has holes in order from the outside.
17, 18 are provided.

Each of the holes 13 and 14 is a round hole for locking one end of a wire rope with a turnbuckle and one end of a suspension chain, which will be described later. The hole 18 is also a round hole and locks the other end of the wire rope with a turnbuckle. The holes 15 and 17 are elongated holes parallel to the longitudinal direction of the parent pipe. The front and rear hook plates 12, 16 overlap with the pipe body 10 connected as shown in FIG. The adjacent parent pipes 1 and 1a are securely joined by tightening.

FIGS. 4 and 5 show a pipe body 10a as a parent pipe.
, 10b are provided in parallel with each other, and the two are connected at an appropriate position by a spacer 19, and the front hook plate 12 and the rear hook plate 16 are attached to the spacer 19. FIG. 6 is a side view showing a state in which a hanging metal fitting 3 with a wire guide used in the present invention is attached to a lower flange of a main girder G of a bridge, and a hanging chain 4 is suspended therefrom. FIG. Suspension fitting with wire guide 3
Is a fixing portion 31, such as a vise, fixed to a flange or the like of the main girder G, a ring metal member 32 connected thereto, and a groove provided on a side surface of the ring metal member 32 for locking a wire rope slidably. A wire guide 33 is formed. The suspension chain 4 is a normal one having hooks at both ends.

FIG. 8 shows a wire rope 5 with a turnbuckle.
In a perspective view partially omitted, two wire ropes 52 of different lengths each having a shackle 51 attached to both ends of a turnbuckle 53 that can be rotated to adjust the length.
Are connected. The reason why the lengths of the two wire ropes 52 are changed is to prevent the turnbuckle 53 from coming to a portion near the wire guide 33 near the center.

Returning to FIG. 1, the construction method of the aerial expansion type suspended scaffold of the present invention will be described. FIG. 1 is a front view showing a state in which this hanging scaffold has already been partially constructed. G is the main girder of the bridge at the top, and 1 is a main pipe suspended from the main girder G via a hanging chain 4. The length is, for example, 3.6 m. Reference numeral 3 denotes a hanging bracket with a wire guide for suspending the suspension chain 4 described in FIGS.
The wire rope 6 with a turnbuckle described in the above is a roller that is attached to the parent pipe 1 in a direction perpendicular thereto.
Reference numeral 7 denotes a plywood panel mounted on the upper part. FIG.
In (a), the suspension scaffold has already been constructed for several spans, and the next span will be attached to this tip.

The next main pipe 1a is prepared on the existing hanging scaffold, and one end of the wire rope 5 with the turnbuckle is connected to the hole of the rear end hook plate 16 of the front main pipe 1 at the end of the existing part as described with reference to FIG. 18 and the other end is locked in the hole 13 of the tip hook plate 12 of the next main pipe 1a, and the intermediate wire rope portion is connected to the wire guide of the hook 3 with the wire guide.
Hook on 33. At this time, the turnbuckle 53 is tightened so that the total length of the wire rope 5 with the turnbuckle is shorter than the last use.

Next, as shown in FIG. 2B, the parent pipe 1a is inserted in the direction of the tip from the existing suspension scaffold, and is connected to the existing parent pipe 1 by the connecting pin 11 described with reference to FIG.
Further, the connecting bolt 2 described in FIG.
Insert the parent pipes 1 and 1a securely by inserting them through 15 and 17. At this time, the tip of the parent pipe 1a is supported by being lifted slightly above the horizontal by a wire rope 5 with a turnbuckle.

Subsequently, a right-angled roller 6 is attached to the main pipe 1a connected as shown in (c), and a plywood panel 7 is laid on the upper part so that work can be performed even on a newly connected hanging scaffold. To Then, as shown in (d), one end of the new suspension chain 4a is locked in the hole 14 of the tip hook plate 12 at the tip of the main pipe 1a, and the suspension fitting 3a with a wire guide is attached to the main girder G above the chain. Connect the other end of 4a to this. The length of the hanging chain 4a is adjusted so that the main pipe 1a is hung horizontally. However, since the tip of the main pipe 1a is slightly upward from the horizontal at present, the hanging chain 4a is in a loosened state.

Finally, as shown in (e), the turnbuckle 53 of the wire rope 5 with a turnbuckle is loosened, the tip of the parent pipe 1a is stored in the hanging chain 4a, and the wire rope 5 with the turnbuckle is removed. The extension of the suspended scaffold is completed. Thereafter, this procedure is repeated, and the suspended scaffold is extended until the tip reaches a predetermined position, for example, the vicinity of the adjacent pier.

FIGS. 9 and 10 show the use of a main pipe having two parallel pipe bodies shown in FIGS. 4 and 5 and a pipe body 10a on both sides of a spacer 19 in place of a roller and a plywood panel.
FIG. 10b is a partial cross-sectional view showing another embodiment in which an end portion of the floor-mounted cloth frame 8 made of a light alloy is placed on 10b. Figure
As shown in FIG. 10, it is desirable to provide a claw 81 for holding the parent pipe from the back side at the end of the floor-attached cloth frame 8 so as to be able to move in and out in the horizontal direction in order to prevent blow-up.

As is clear from the above description, the aerial expansion type suspended scaffold of the present invention extends the parent pipe in a large unit of, for example, 3.6 m while using the existing portion prior to the entire scaffold, and safely expands. Since work can be performed, safety and efficiency in work at a high place are significantly improved.

[0023]

According to the present invention, there is an excellent effect that the work for extending the suspended scaffold can be performed safely and efficiently.

[Brief description of the drawings]

FIG. 1 is a front view showing a construction procedure of an aerial expansion type suspended scaffold of the present invention.

FIG. 2 is a perspective view showing a connection state of a parent pipe in the present invention.

FIG. 3 is a front view showing a connection state of a parent pipe in the present invention.

FIG. 4 is a perspective view showing a connection state of a parent pipe in a modified example of the present invention.

FIG. 5 is a side view as viewed in the direction of arrows AA in FIG. 4;

FIG. 6 is a side view showing the vicinity of the suspension chain according to the present invention.

FIG. 7 is a front view showing the vicinity of the suspension chain according to the present invention.

FIG. 8 is a perspective view showing a wire rope with a turnbuckle according to the present invention.

FIG. 9 is a partial sectional view showing a modification of the present invention.

FIG. 10 is a partial sectional view showing a modification of the present invention.

FIG. 11 is an overall perspective view showing a first example of a conventional technique.

FIG. 12 is a sectional view taken along the line XX of FIG. 11;

FIG. 13 is a perspective view showing a construction procedure in a second example of the related art.

FIG. 14 is a perspective view showing a completed state of the second example of the related art.

FIG. 15 is a perspective view showing a third example of the related art.

FIG. 16 is a perspective view showing a panel in a fourth example of the related art.

FIG. 17 is a perspective view showing a construction procedure in a fourth example of the related art.

[Description of Signs] 1 Parent pipe 2 Connecting bolt 3 Hanging fitting with wire guide 4 Hanging chain 5 Wire rope with turnbuckle 6 Roller 7 Plywood panel 8 Floor frame 10 Pipe body 11 Connecting pin 12 Tip hook plate 13 Hole 14 Hole 15 hole 16 rear end hook plate 17 hole 18 hole 31 fixing part 32 ring hardware 33 wire guide 51 shackle 52 wire rope 53 turnbuckle 60 anchor bracket 61 main cable 62 rolling (scaffolding pipe) 63 hooking pipe 64 handrail 65 scaffolding plate (Floor material) 66 Safety net 67 Hanging chain 68 Parent pipe 69 Work floor 70 Beam material 71 Girder material 72 Hairpin mounting bracket 73 Do not do 74 Protector 75 Panel 76 Fabric frame 77 Parent frame pipe 78 Connection joint 79 Start bracket 81 Claw 82 Bolt G Main girder P Pier

Claims (2)

[Claims] 1. A main pipe (1) suspended in a horizontal direction by a suspension chain (4) attached to a superstructure (G) at a predetermined interval is sequentially connected in a longitudinal direction. In the aerial-expandable suspension scaffold having a roller (6) mounted at right angles thereto and a plywood panel (7) placed on top of the roller, the suspension chain (4) has a wire rope (52) on its side. Suspended on the upper structure (G) via a wire fitting (3) having a wire guide having a wire guide (33) slidably engaged with the upper structure (G),
The parent pipe (1) has a hole (13) for locking a wire rope at the tip of a steel pipe body, and a connecting bolt (2).
A hook plate (12) provided with a hole (15) for a bolt into which a cable is inserted, a hole (14) for locking the suspension chain (4), and a hole (15) for locking a wire rope at the rear end. 18)
And a hole (17) for a bolt into which the connecting bolt (2) is inserted in an overlapping state while being connected to the tip hook plate.
A joint part (11) for attaching the rear end hook plate (16) provided with the above to the upper part of the pipe body (10) and connecting the pipe body (10) to both ends of the pipe body (10) in the axial direction. An aerial expansion type suspended scaffold characterized by having: 2. A main pipe suspended in a horizontal direction by a suspending chain attached to the upper structure at a predetermined interval is connected in the longitudinal direction sequentially, and a roller in a direction perpendicular to the main pipe is attached to the main pipe. 2. The method according to claim 1, wherein a plywood panel is mounted on an upper part of the suspension pipe, and one end of a wire rope with a turnbuckle is attached to a rear end hook plate of a parent pipe at a tip of the existing suspension scaffold. And the other end is hooked up to the hook plate of the parent pipe to be connected to the other end via the wire guide of the hanging metal fitting with a wire guide above the hanging chain hanging the tip of this parent pipe, and then After connecting the rear end of the main pipe to be connected to the front end of the main pipe at the front end of the existing suspension scaffold via the joint, the front end of the newly connected main pipe Attach a right angle roller to this newly connected parent pipe while lifting and supporting the minutes with the above-mentioned wire rope with turnbuckle, further place a plywood panel on top of this, and then attach the newly connected parent pipe. Attach a hanging chain to the tip and connect it to the upper structure via a wire-guided hanging bracket,
Thereafter, the turnbuckle of the wire rope with a turnbuckle is loosened, and the tip of the newly connected parent pipe is deposited in a suspension chain.