JP2008215031A - Scaffolding construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scaffolding construction method which facilitates assembly and disassembly of scaffolding, and is excellent in workability and safety at a location immediately below a floor slab. <P>SOLUTION: According to the scaffolding construction method, prestressing strands 120 are supported by hangers 111, 112 mounted on both side surfaces of piles 210 in each row, at a height of a scaffolding erection level, so as to be arranged on the periphery of the piles 210 in each row, and ends of the prestressing strands 120 are fixed to a fixture 113 mounted on the pile 210 at one end of each row. Then the prestressing strands 120 are strained to be fixed to the fixture 113, and steel pipes 130 are laid on the prestressing strands 120, followed by laying an expand metal 140 on the laid steel pipes 130. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a scaffold construction method for construction directly under a floor slab supported by a plurality of rows of piles.

  Conventionally, when inspecting, painting, or repairing the lower surface of a structure such as a bridge or pier where the slab is supported by multiple rows of piles, a scaffold is temporarily installed directly under the slab. It is used as a working scaffold.

  Such a scaffold is generally assembled from the ground surface, but a suspended scaffold is employed when it is impossible to assemble the scaffold from the ground surface, such as a pier.

In this suspension scaffold, an anchor material is driven into the lower surface of the floor slab, a steel pipe is suspended from the anchor material with a suspension chain, and a scaffold plate is laid on the steel pipe to form a scaffold floor (see, for example, Patent Document 1). ).
JP 2002-69930 A (FIG. 6)

  However, the suspension scaffold described above requires a great amount of time and labor for assembly and disassembly because a large number of anchor materials need to be driven into the lower surface of the floor slab. In addition, since a large number of suspension chains exist on the suspension scaffold, there is a possibility that the suspension chains may hinder operations such as inspection, painting, and repair, resulting in poor workability. Furthermore, there is a possibility that the suspension chain may become a dangerous factor during work.

  In view of the above circumstances, an object of the present invention is to provide a method for constructing a scaffold that is easy to assemble and dismantle and is excellent in workability and safety directly under a floor slab.

  The construction method of the scaffold of the present invention that achieves the above object is to support the PC cable at the scaffold construction level on both sides of the piles in each row when constructing the scaffold directly under the floor slab supported by the rows of piles. It is characterized in that a support member is attached, a PC cable is supported on the support member and arranged around the piles in each row, the PC cable is tensioned and fixed, and a work floor is constructed on the PC cable. To do.

  In the scaffold construction method of the present invention, a PC cable is supported on a support member attached to a scaffolding construction level on both sides of each row of piles and arranged around each pile, and the PC cable is tensioned. The work floor is constructed on the PC cable. Therefore, according to the scaffold construction method of the present invention, assembly and disassembly are easier than conventional suspension scaffolds, so that the number of construction days for the scaffolding can be shortened and construction costs are suppressed. In addition, according to the scaffold construction method of the present invention, there is no suspension chain or the like that hinders work on the scaffold, so that the workability and safety directly under the floor slab are excellent.

  According to the scaffold construction method of the present invention, it is easy to assemble and disassemble as compared with a conventional suspended scaffold, and is excellent in workability and safety directly under the floor slab.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of a scaffold 100 and a pier 200 on which the scaffold 100 is constructed, illustrating an embodiment of the scaffold construction method of the present invention. FIG. 2 is a plan view showing a first step in the construction method of the scaffold 100 shown in FIG. FIG. 3 is an enlarged view of a portion A shown in FIG. 4 is a view as seen from the arrow B shown in FIG. 3, FIG. 5 is a view as seen from the arrow C shown in FIG. 3, FIG. 6 is a view seen from the arrow D shown in FIG. FIG. 4 is a view taken in the direction of arrow E shown in FIG. 3.

  FIG. 1 shows a jetty 200 in which a floor slab 220 is supported by five rows of piles 210. Further, FIG. 1 also shows a scaffold 100 constructed just below the floor slab of the pier 200.

  Hereinafter, a construction method of the scaffold 100 shown in FIG. 1 will be described.

  First, as shown in FIG. 2 to FIG. 7, hanging brackets 111 and 112 that support the PC steel strand 120 are attached to the scaffolding construction levels on both sides of the piles 210 of each row using bolts 114, A fixing metal fitting 113 for fixing the end portion of the strand 120 of PC steel is attached to the pile 210 at the end portion using a bolt. This PC steel strand 120 is an example of the PC cable referred to in the present invention.

  Next, the PC steel stranded wire 120 is supported by the hanging metal fittings 111 and 112 and arranged around the piles 210 in each row, and the PC steel stranded wire 120 is tensioned using a jack (not shown) to the fixing metal fitting 113. To settle.

  Here, the suspension fitting 111 attached to the pile 210 at one end of each row shown in FIGS. 3 to 5 is a U-shaped support whose upper part is released in the attached state. In the first embodiment of the member, a PC steel wire 120 is inserted from above and supported.

  Moreover, the hanging metal fittings 112 attached to the piles 210 in each row except for the one end shown in FIG. 3, FIG. 6, and FIG. In the second embodiment of the support member, a PC steel strand 120 is inserted from the side and disposed.

  In addition, here, as an example of the support member according to the present invention, the above-described two types of suspension fittings have been described. However, the support member according to the present invention is not limited to this, and a PC cable is used. Any shape may be used as long as it is supported.

  FIG. 8 is a plan view showing a second step in the construction method of the scaffold 100 shown in FIG.

  As shown in FIG. 8, the steel pipes 130 are laid on the PC steel strands 120 arranged and fixed around the piles 210 in each row.

  Finally, the expanded metal 140 as a work floor is laid on the laid steel pipes 130.

  FIG. 9 is a plan view for explaining another embodiment of the present invention.

  As shown in FIG. 9, fixing brackets 113 for fixing the ends of the strands 121 and 122 of PC steel are attached to the piles 210 at both ends of each row, and the central pile 211 of the piles 210 in each row is used as a boundary. The PC steel strands 121 and 122 may be arranged around each divided pile row, and may be tensioned using a jack and fixed to the fixing bracket 113.

  As described above, according to the scaffold construction method of the present embodiment, since it is easier to assemble and dismantle than conventional suspension scaffolds, the number of construction days for the scaffolding can be shortened, and the construction cost is reduced. Is suppressed. Further, according to the scaffold construction method of the present embodiment, there is no suspension chain or the like that hinders work on the scaffold 100, and therefore, workability and safety directly under the floor slab 220 are excellent.

  In the above-described embodiment, the scaffold construction method of the present invention has been described with reference to an example of the scaffold construction method constructed immediately below the floor slab of the pier. However, the scaffold construction method of the present invention is described here. It is not limited, and can be applied to a construction method for a scaffold that is constructed immediately below a floor slab supported by a plurality of rows of piles.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a pier on which a scaffold and a scaffold are constructed, illustrating an embodiment of a scaffold construction method of the present invention. It is a top view which shows the 1st process in the construction method of the scaffold shown in FIG. It is an enlarged view of the A section shown in FIG. It is a B arrow view shown in FIG. It is C arrow line view shown in FIG. It is a D arrow line view shown in FIG. FIG. 4 is a view taken along arrow E shown in FIG. 3. It is a top view which shows the 2nd process in the construction method of the scaffold 100 shown in FIG. It is a top view explaining other embodiment of the present invention.

Explanation of symbols

100 Scaffold 111,112 Suspension bracket 113 Fixing bracket 114 Bolt 120,121,122 PC steel strand 130 Steel pipe 140 Expanded metal 200 Pier 210, 211 Pile 220 Floor slab

Claims (1)

  When constructing a scaffold directly under a floor slab supported by multiple rows of piles, attach support members that support PC cables to the scaffolding construction level on both sides of each row of piles, and allow the PC cables to be supported by the support members. A scaffold construction method comprising: arranging a work floor on the PC cable, and arranging the work floor on the PC cable.

Images