JPH06146223A - Method of erecting suspended scaffold - Google Patents

Abstract

PURPOSE:To enhance the safety by laying main wires with the use of a temporarily installed wire provided between the upper parts of structures, as a guide, and by joining scaffolds which are slidable on the main wires as a guide, one by one so as to form a long scaffold. CONSTITUTION:A plurality of main wires 3 are stretched between anchors with the use of a temporarily installed wire 2 stretched between the upper parts of bridge bases 1, as a guide. Next, a clamp incorporating a roller is attached to the lower end of a scaffold 7 assembled in a ladder-like shape, and a safety net for preventing a fall is attached to the scaffold 7. Then, the scaffold assembled on the wires 3 on one bridge base side 1 through the intermediary of the roller and having two or three spans is towed by a tow cable 81. Further, a new scaffold 7 is laid as an extension between the bridge beds 1 by repeating the work for assembling the scaffold 7 in a space obtained in rear of the a scaffold 7. Further, a lift-up device 9 is attached to a bridge beam 11 so as to lift up the scaffold 7 through the intermediary of a lift-up wire 91. With this arrangement, it is possible to prevent occurrence of a fall and a drop, and further it is possible to travel between the bridge bases before the installation of the bridge.

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 suspended scaffolds.

[0002]

[Problems to be Solved by the Invention] Conventionally, since the scaffolding is suspended from a erected girder and the like, the scaffold is assembled and erected.
At the front end of assembly, there is a risk of falling and falling of materials.
Moreover, if the lower part of the girder is a roadway or a railway, falling objects will be a big problem.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a suspension scaffold construction method capable of safely constructing a scaffold prior to a construction. And

[0004]

[Means for Solving the Problems] That is, according to the present invention, a temporary wire is installed in the upper part between structures at a site where a suspended scaffold is to be installed, and the temporary wire is used as a guide to guide the main wire below the temporary wire.
, A scaffolding configured to be slidable using this main wire as a guide, is extended by extending along the main wire,
It is a method of constructing suspended scaffolds in which continuous scaffolds are constructed between structures.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a case of creating a bridge girder will be described as an example. <A> Temporary Wire-As shown in FIG. 2, before the girder is erected, the temporary wire-2 is erected above the abutment 1. This temporary wire-2
A known rope strand or parallel wire strand is used as the material.

<B> Construction of Main Wire-For the main wire-3, a wire having a strength such as known rope strands or parallel wire strands is used to support the scaffold until it is suspended by the girder. Figure 3
As shown in, a plurality of pairs of mooring fittings 4 are installed on the abutments 1 on both sides. Next, a plurality of main wires 3 are laid horizontally in parallel between the mooring fittings 4 of the abutments 1 on both sides. The main wire-3 is installed by, for example, equipping the temporary wire-2 installed above with the movable pulley 6 in which the tow line 5 is connected,
One end side of the main wire-3 is attached to the movable pulley 6, and the other end side of the main wire-3 is connected to one mooring fitting 4. Then, one of the tow lines 5 is pulled to move the movable pulley 6, and the main wire-3 is installed between the abutments 1. Main wire-3
After the completion of the erection, the temporary wire-2, the tow cable 5, and the movable pulley 6 are removed.

<C> Scaffold As shown in FIG. 6, the scaffold 7 is assembled by arranging pipes 71 and the like in a ladder state and connecting them with clamps 72 and the like. Further, a clamp 73 with a roller is attached to the pipe 71, and this roller is attached on the main wire-3 so that the scaffold 7 can be slid. Furthermore, a safety net 74 for preventing a fall is stretched on the scaffold 7. It should be noted that a drop-out preventing means is provided so that the scaffold 7 does not drop off the main wire-3.

<D> Extension As shown in FIG. 4, the scaffold 7 is assembled on the main wire-3 on one side of the abutment 1 for a few spans. A pulley 8 is attached to the other side of the abutment 1, and a tow line 81 whose one end is connected to the assembled scaffold 7 is wound around the pulley 8 and U-turned so that the other end is located on the scaffold 7 side. . And the tow line 81
To slide the scaffold 7 along the main wire-3 for 2 to 3 spans, and to assemble the 2-3 span scaffold 7 to the space formed behind the scaffold 7 again. By repeating this operation, the scaffold 7 is extended and installed between the abutments 1. Scaffolding 7
After erection, the pulley 8 and the tow line 81 are removed.

<E> Suspension of Suspension Scaffold As shown in FIG. 1, a suspension device 9 such as a winch or a chain block is attached to a plurality of abutments 1 and the suspension ropes 91 are suspended. Then, the lower end of the hoisting rope 91 is connected to the scaffold 7, and the hoisting device 9 is operated to hoist the scaffold 7.

<F> Attachment of incidental equipment After the completion of the tensioning of the scaffold 7, the lifting device 9 and the lifting rope 91
To remove. Then, ancillary equipment such as scaffolding boards and handrails are attached to the suspended scaffolding 7 to complete the construction of the suspended scaffolding 7.

[0011]

Since the present invention is as described above, the following effects can be expected. <a> Install a scaffold with safety nets installed prior to the planned construction. Therefore, it is possible to prevent a person from falling and materials and the like from falling during assembly. <B> Before installing the planned construction material, install a scaffold supported by the main wire. Therefore, it is possible to move between abutments before the installation of the planned construction material.

[Brief description of drawings]

[Figure 1] Explanatory drawing of the completed state of the suspended scaffold

FIG. 2 is an explanatory view of a temporary installation process of a temporary wire.

FIG. 3 is an explanatory view of a temporary wire attaching process.

FIG. 4 is an explanatory view of a scaffold extending process.

FIG. 5 is an explanatory view of a scaffold extending process.

FIG. 6 is an enlarged explanatory view of the scaffold.

Claims (2)

[Claims] 1. A temporary wire is installed on the upper part of a structure between suspended scaffolding construction sites, a main wire is installed below the temporary wire as a guide, and the main wire is slidable by using the main wire as a guide. A method of constructing suspended scaffolds, in which the constructed scaffolds are extended by extending them along the main wire, and continuous scaffolds are constructed between structures. 2. The method for constructing a suspended scaffold according to claim 1, wherein a safety net is installed on the scaffold.