JP4516800B2 - How to build a suspended scaffold - Google Patents

Description

The present invention can easily be constructed and dismantled at low cost, to a method for constructing a Tsuashi field which can improve the working efficiency.

  At construction sites and repair sites of structures, scaffolds are installed around the outer walls, and workers move to high and low places to perform construction and repair work. Usually, a frame scaffold made up of columns and work floors is often used on the ground around the outer periphery of the structure. However, in the case of a framework scaffold, there are problems that it takes time to assemble and dismantle, the cost is high, and it cannot be used for a high-rise structure. In addition, in the case of a structure such as a pier projecting on the water, a scaffold cannot be assembled on the outer ground, so for example, a support bracket for the scaffold is installed on the structure and the support bracket is installed. A scaffold must be built on top. This method is costly and damages the structure by welding or the like for installing the support bracket.

  As a scaffold that can deal with a high-rise structure without damaging the structure, there is a gondola scaffold that hangs a gondola from the top of the structure and moves the gondola up and down. However, in the gondola scaffolding, it is necessary to move the gondola many times, and it is not possible to perform a wide range of work at once, which takes time and cost, and is greatly affected by the weather, so there is a problem in terms of safety and process control is there. In addition, since the work cannot be performed with the entire periphery of the structure being cured, it is difficult to prevent scattering of paint, rust, members, etc., resulting in safety and environmental problems. Furthermore, when the outer wall of the structure is not vertical but has a deformed shape, it is difficult to move the gondola scaffolding along the outer wall, resulting in poor workability.

  As a structure for suspending from the upper part of the structure, a chain-type suspended staircase scaffold has been proposed (see, for example, Patent Document 1). In this proposal, there is a chain, landing, and staircase, the landing is connected vertically by the chain, and the landing that is the top is lifted with a crane, placed on the frame above the structure and joined. I have to. As the uppermost landing is lifted, a plurality of landings are deployed and installed at predetermined height intervals, and a staircase is provided that allows each landing to be moved up and down.

However, even in this proposal, if the outer wall of the structure is not vertical but has a deformed shape, it is difficult to install a scaffold along the outer wall, and there is a problem that workability is deteriorated. Moreover, since it is suspended, there also exists a problem of lacking in stability.
Japanese Patent Laid-Open No. 11-256811

  An object of the present invention is to provide a suspension scaffold that can be easily constructed and disassembled at low cost, and that can improve work efficiency and stability, and a construction method thereof.

Hanging method for constructing a scaffold of the present invention is at least hanging method for constructing a scaffolding constructed to surround the three sides of the structure, are arranged a plurality of working floor is connected to the hanging chain vertically Rutotomoni, each work Two suspension scaffolds are installed in the opening hatch provided on the floor so that the upper and lower work floors can be moved and suspended near the outer wall of the structure to sandwich the structure in the plane direction. place manner, it suspended further established a new connection anchorage between the two suspended scaffold suspended, allowing the traffic between the working floor of the working floor and the two hanging scaffold of the connecting scaffold In the scaffold construction method, the suspension rope is rolled up by a winch installed on the uppermost stage of each suspension scaffold, and each suspension scaffold is deployed in the vicinity of the vertical outer wall of the structure. Two on the surface with the outer wall It is characterized in that it has established a connection scaffold for connecting scaffold.

  Further, according to the construction method of the suspended scaffold of the present invention, it is a construction method of the suspended scaffold constructed so as to surround at least three sides of the structure, and a plurality of work floors are connected in the vertical direction at predetermined intervals. Two suspension scaffolds that allow the floor to be moved up and down are hung near the outer wall of the structure and arranged so that the structure is sandwiched in the plane direction, and a new space is established between the two suspended scaffolds. A work platform is installed across the work floor to connect the two suspension scaffolds, and the newly built work floor and the work floors of the two suspension scaffolds can be moved back and forth. In addition, the number of members can be reduced, and the cost can be reduced. Since the scaffold is constructed in at least three sides of the structure, the stability is improved, and the work floor of each scaffold can be moved and the work efficiency is improved.

  Hereinafter, a suspended scaffold and a construction method thereof according to the present invention will be described based on the embodiments shown in the drawings. FIG. 1 shows an example of an embodiment constructed on a pier 18 projecting on water. Suspended scaffolds 1a and 1b are respectively installed on a pair of surfaces having a vertical outer wall, and a connecting scaffold 2 for connecting both suspended scaffolds 1a and 1b is installed on a surface having an outer wall curved in the vertical direction. That is, in the plane direction, two suspension scaffolds 1a and 1b are arranged so as to sandwich the bridge pier 18, and a connection scaffold 2 that couples the suspension scaffolds 1a and 1b is provided. A work floor is not yet attached to the connection scaffold 2.

  Both suspension scaffolds 1a and 1b are suspended via a suspension cable 5 in a scaffold attachment hole provided in a main girder (not shown) that constitutes a viaduct together with a bridge pier 18. Both suspension scaffolds 1a and 1b each have a plurality of work floors 3 connected by suspension chains 4 in the vertical direction at predetermined intervals, and handrails 7 are attached in the middle of the suspension chains 4 connecting the respective work floors 3. Thus, the outer periphery of the work floor 3 is surrounded. If expanded metal is used for the work floor 3, weight reduction can be achieved. Each work floor 3 is provided with an opening hatch 9, and a ladder 8 is installed on each opening hatch 9 so that each work floor 3 can be moved. Both suspended scaffolds 1a and 1b are covered with mesh sheets 16 stretched on both side surfaces and outer side surfaces, respectively.

  Instead of or in addition to the suspension chain 4 that connects the work floor 3 up and down at a predetermined interval, as shown in FIG. By connecting the upper and lower work floors 3 with the links 26 and using the support pillars 15 having a structure with the links 26 in the middle, the vertical distance between the work floors 3 can be ensured and safety can be improved.

  On the other hand, in addition to the suspension chain 4, one end is connected to one work floor 3 with a link 26 as shown in FIG. 10B, and the upper end is engaged with the engagement part 27 of the other work floor 3. As the supporting pillar 25 to be made, safety can be enhanced with a simpler structure.

  The support pillars 25 described above are provided at appropriate positions. However, when the support pillars 25 are provided for all the work floors 3, the safety can be enhanced most.

  Since both suspension scaffolds 1a and 1b have the same structure, the structure of one suspension scaffold 1a will be described with reference to FIG. In FIG. 1, the suspended scaffolding 1 a is installed at half the length of one side of the pier 18, but FIG. 2 shows a state where the suspended scaffolding 1 a is installed over the entire length of one side. The work floor 3 of the suspension scaffold 1a is fixed by being sandwiched between work floor outer frames 6 on both sides in the longitudinal direction. The work floor outer frame 6 is connected in the longitudinal direction by the frame connecting portion 12. Thus, when the outer wall of a structure is long, the some work floor 3 is connected with a longitudinal direction. Between the work floors 3 to be connected, a scaffold plate 17 and a handrail 7 are installed to fill a gap.

  The inner work floor outer frame 6 is provided with a guide roller 11 and abuts against the outer wall of the pier 18 so as to smoothly move up and down when lifting the suspension scaffold 1a and to function as a suspension for the suspension scaffold 1a. Yes.

  As shown in FIG. 4, the work floor outer frame 6 on the inner side of the work floor outer frame 6 sandwiching the work floor 3 of both suspension scaffolds 1a, 1b on both sides in the longitudinal direction is on the L-shape to which the cushion material 14 is attached. The brace 13 is fixed and abuts on the bridge pier 18 via the cushioning material 14 to suppress the swing in the longitudinal direction of both suspension scaffolds 1a and 1b, thereby enabling stable installation.

  As shown in FIG. 1, a wire rope 21 is stretched between work floors 3 installed at substantially the same height of both suspended scaffolds 1a and 1b. The wire rope 21 is connected to the working floor 3 of each height while changing the position in the longitudinal direction of the suspension scaffolds 1a and 1b, and along the outer wall surface of the bridge pier 18 that is curved in the vertical direction. is set up.

  Although the structure of the connection scaffold 2 is demonstrated with FIG. 3, in order to clarify this structure, it is set as the figure which abbreviate | omitted the handrail 7 installed in the work floor 3 of both suspension scaffolds 1a and 1b. Two wire ropes 21 via a turnbuckle 23 between shackles 22 fixed to the work floor outer frame 6 inside the work floor outer frame 6 sandwiching the longitudinal direction both sides of the work floor 3 of both suspended scaffolds 1a, 1b. Are tensioned in parallel, and the tension is adjusted by the turnbuckle 23.

  The work floor 20 is disposed on the two wire ropes 21 so that the work floor 20 and the work floors 3 of the two suspended scaffolds 1a and 1b can be moved. Handrails 7 are installed on both sides of the work floor 20 of the connection scaffold 2.

  In FIG. 5, two suspension scaffolds 1 a and 1 b arranged with the bridge pier 18 sandwiched so as to surround the four sides of the bridge pier 18, and the coupling scaffold 2 are coupled to both longitudinal ends of the suspension scaffolds 1 a and 1 b. The cross-sectional view at the time of being constructed is shown. The four outer walls of the pier 18 are surrounded by a work floor 3 of a pair of suspended scaffolds 1a, 1b and a work floor 20 of a connecting scaffold 2 installed on a wire rope 21 that connects the suspended scaffolds 1a, 1b. . Both the suspended scaffolds 1a and 1b and the two coupled scaffolds 2 and 2 and the outer wall of the bridge pier 18 are fixed at predetermined intervals via a scaffold fixing bracket 24 to ensure stability. In addition, the outer sides of the two suspended scaffolds 1a and 1b and the two coupled scaffolds 2 and 2 are covered with a mesh sheet 16 so that paint, rust, members, and the like are not scattered outside.

  The construction method of the suspension scaffold according to the present invention will be described with reference to the drawings, taking as an example the construction of the suspension pier 18 constructed on the water.

  As a 1st process, as shown in FIG. 6, the suspension scaffold 1 is conveyed by the trolley 15 under both surfaces of the bridge pier 18 which has a vertical outer wall, respectively. The suspension rope 5 is lowered from the scaffold attachment hole provided in the main girder 19 located above the pier 18. The suspension rope 5 is attached to a baby winch 10 installed on the uppermost upper stage 3 a of the suspension scaffold 1, wound up, the suspension scaffold 1 is lifted upward, and a plurality of work floors 3 connected vertically by a suspension chain 4. Is expanded in the vicinity of the outer wall. At this time, a handrail 7 attached in the middle of the suspension chain 4 is also installed. When being lifted, the guide roller 11 shown in FIG. 2 is brought into contact with the outer wall, thereby enabling smooth lifting while preventing shaking. Moreover, when the baby winch 10 is used in this manner, the suspension scaffold 1 can be easily lifted without using a crane or the like.

  In the second step, the suspension scaffold 1 is lifted up to a predetermined height, and a plurality of work floors 3 are vertically arranged at predetermined intervals, and then stored in each work floor 3 as shown in FIG. The ladder 8 that has been raised is raised so that each work floor 3 can be moved up and down. Then, mesh sheets are stretched on the side surface and the outer surface of the suspended scaffold 1. In this embodiment, since the width of the pier 18 is long, another suspension scaffold 1 is arranged in the width direction in the same manner.

  As the third step, as shown in FIG. 2, the work floor outer frames 6 of the respective suspension scaffolds 1 are connected to each other by the frame body connecting portion 12, and the vicinity of both outer walls of the pier 18 as shown in FIG. In each case, the suspended scaffold 1 whose outer peripheral surface is covered with the mesh sheet 16 is installed. As shown in FIG. 5, each work floor 3 and the outer wall of the pier 18 are fixed by the scaffold fixing bracket 24, and safety is ensured.

  As a fourth step, a connecting scaffold 2 that connects the two suspended scaffolds 1 is installed. As shown in FIG. 3, the wire rope 21 is stretched from the end of one suspended scaffold 1a to the end of the other suspended scaffold 1b, and the outside of the work floor inside the work floor 3 of both suspended scaffolds 1a, 1b. A shackle 22 provided on the frame 6 is stretched through a turnbuckle 23. A work floor 20 is installed on the wire rope 21, and handrails 7 are provided on both sides of the work floor 20. In this manner, the work floor 20 of the connection scaffold 2 is bridged between the work floors 3 of both the suspended scaffolds 1a and 1b, and the traffic can be made. The installation work is performed on the work floor 3 arranged at each height to install the connection scaffold 2. The work floor 20 of the connection scaffold 2 and the outer wall of the pier 18 are fixed by the scaffold fixing bracket 24 as shown in FIG. 5 to ensure safety.

  After the connection scaffold 2 is installed, as shown in FIG. 9, the mesh sheet 16 is stretched outside the connection scaffold 2 to complete the construction of the suspended scaffold of the present invention. In addition, what is necessary is just to perform the operation | work contrary to construction when disassembling this suspension scaffold.

  By changing the position of the shackle 22 provided on the work floor outer frame 6 inside the work floor 3 of the both suspension scaffolds 1a, 1b in the longitudinal direction of both suspension scaffolds 1a, 1b, the curved shape of the outer wall of the pier 18 is changed. The work floor 20 of the connection scaffold 2 can be installed along the shape. As a result, the distance between the work floor 20 and the outer wall does not change drastically, and the operator can easily work on the outer wall, thereby improving work efficiency.

  In order to stretch the mesh sheet 16 on both suspension scaffolds 1, the mesh sheet 16 is installed in a state of being wound up on the upper end of the suspension scaffold 1 as shown in FIG. 9, and after the lifting of the suspension scaffold 1 is completed, If the rolled mesh sheet 16 is released, it can be efficiently stretched. The mesh sheet 16 stretched on the connection scaffold 2 can be stretched in the same manner.

  In addition, the mesh sheet 16 is stretched between the work floor 3 of the pair of suspended scaffolds 1 and the work floor 20 of the connection scaffold 2 and the outer wall of the bridge pier 18 to collect the fallen objects. preferable.

  Since the construction work and the repair work are performed on the pier 18 using the suspension scaffold of the present invention constructed as described above, a wide range of work can be performed at a time, and low cost and efficient work can be performed. In addition, construction and disassembly are easy, can be completed in a short time, and the number of members is less than that of the frame scaffold, so that the cost can be reduced.

  In addition, by constructing the pair of suspended scaffolds 1a, 1b and their longitudinal ends at the coupling scaffold 2 so as to surround at least three sides, preferably four sides of the pier 18, it is possible to prevent external environment such as wind and rain. In contrast, the scaffold can be constructed on the pier 18 more stably.

  If the guide roller 11 of the suspension scaffold 1 that is in contact with the outer wall of the bridge pier 18 is movable or removable, for example, when applying paint, the application work can be easily performed without leaving any paint.

  Although this embodiment demonstrated the case where a suspension scaffold was constructed | assembled on the bridge pier projected on the water, it can construct | assemble similarly to the structure currently built on the ground. In this case, a truck vehicle or the like is used for transporting the suspension scaffold 1 or the like.

It is a perspective view which shows an example of embodiment of the suspension scaffold of this invention. It is a perspective view which shows the structure of the suspension scaffold which comprises the suspension scaffold of this invention and is arrange | positioned so that a structure may be pinched | interposed. It is a perspective view which shows the structure of the connection scaffold which comprises the suspension scaffold of this invention. It is an A arrow enlarged view of FIG. It is a cross-sectional view which shows the fixed state of the suspension scaffold and bridge pier of this invention. It is a whole outline side view explaining the 1st process of the construction method of the suspension scaffold of the present invention. It is a whole outline side view explaining the 2nd process of the construction method of the suspension scaffold of the present invention. It is a whole outline side view explaining the 3rd process of the construction method of the suspension scaffold of the present invention. It is a whole outline | summary side view explaining the 4th process of the construction method of the suspension scaffold of this invention. It is explanatory drawing which shows the example of the support pillar which can be folded.

Explanation of symbols

1, 1a, 1b Suspended scaffolds arranged to sandwich a structure 2 Linked scaffolds
DESCRIPTION OF SYMBOLS 3 Work floor of suspension scaffold arrange | positioned so that structure may be pinched | interposed 3a Upper stage 4 Suspension chain 5 Suspension rope 6 Work floor outer frame 7 Handrail 8 Ladder 9 Opening hatch 10 Baby winch 11 Guide roller 12 Frame body connection part 13 Shaking Metal fittings 14 Cushioning materials 15 Boats 16 Mesh sheets 17 Scaffolding plates 18 Bridge piers 19 Main girders 20 Work floors of connecting scaffolds 21 Wire ropes 22 Shackles 23 Turnbuckles 24 Scaffolding fixtures 25 Support columns 26 Links 27 Engagement parts

Claims (2)

A construction method of a suspended scaffold constructed to enclose at least three sides of a structure, wherein a plurality of work floors are arranged in a vertically connected manner with a suspension chain, and a ladder is provided in an opening hatch provided on each work floor. Two suspended scaffolds constructed so as to be able to travel between the upper and lower work floors are arranged near the outer wall of the structure so as to sandwich the structure in the plane direction, and are further suspended In the construction method of a suspended scaffold in which a new coupled scaffold is installed between two suspended scaffolds, and the working floor of the coupled scaffolds and the working floor of the two suspended scaffolds are allowed to pass, Each suspension scaffold is unrolled in the vicinity of the vertical outer wall of the structure by rolling it up with a winch installed on the top stage of the scaffold, and then the two suspension scaffolds are connected to a surface having an outer wall that is curved in the vertical direction. To establish a connected scaffold How to build a suspended scaffold, characterized in that it was. The construction method for a suspended scaffold according to claim 1, wherein the mesh sheet is installed in a state where the mesh sheet is wound up on an upper end portion of the suspended scaffold, and the mesh sheet is released after the lifting of the suspended scaffold is completed.

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