JPH0687557U - Scaffolding for deep foundation work - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a scaffold for deep foundation work that does not require assembling the scaffold over the entire length from the bottom to the top of the hole, and that allows economical and safe work. [Structure] A scaffold used for deep foundation work in which steel bars are assembled in a hole excavated in the shape of a cylinder in the ground, and then concrete is placed, and the support arm 2 is attached to the wall surface of the hole.
And a disk scaffold 3 suspended from the upper part of the hole, so that the disk scaffold can be supported by the upper surface of the support arm 2 for deep foundation work.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a scaffold for deep foundation work.

[0002]

[Prior art]

 The deep foundation method is a type of cast-in-place concrete pile method, and is a method of constructing a foundation pile with a large diameter by protecting the surroundings and assembling steel rods in the holes excavated mainly by manpower and placing concrete. . In order to assemble the rebar inside the deep shaft, it is necessary to install a scaffold inside the rebar and have an operator ride on the scaffold to handle the rebar.

[0003]

[Problems to be solved by the present invention]

 In such a conventional scaffold for deep foundation work, the hole is once drilled to the deepest part, and then the rebar is assembled, which causes the following problems. <a> Assemble the scaffold from the bottom to the top, and the workers on this scaffold will take time to assemble and reinforce the scaffolding. there were. <B> In a plan view, the scaffold is rectangular and the holes are circular. As a result, there is a position that is far from the hole wall, and the worker must reach out to assemble the rebar in an unstable state, which is uneconomical and dangerous.

[0004]

[Purpose of the present invention]

 The present invention was made in order to achieve the above-mentioned object, and it is not necessary to assemble the scaffold over the entire length from the bottom to the top of the hole, and a scaffold for deep foundation construction that enables economical and safe work The purpose is to provide.

[0005]

[Means for solving problems]

 That is, the present invention is a scaffold used for deep foundation work in which a reinforcing bar is assembled in a hole excavated in a columnar shape in the ground, and then a concrete is placed, and a supporting arm to be attached to the wall surface of the hole. And a disc scaffold suspended from the upper part of the hole, the diameter of the circle inscribed at the tips of the plurality of supporting arms when three or more supporting arms are attached from the wall surface toward the center of the hole. It is a scaffold for deep foundation work that is smaller than the diameter of the scaffold.

[0006]

[Configuration of the present invention]

 The scaffolding for deep foundation work of the present invention will be described below with reference to the drawings. <A> Deep foundation method First, a known deep foundation method will be briefly described. In the deep foundation method, an operator enters the hole and mainly excavates by manpower while supporting the hole wall with an arcuate and corrugated plate called liner plate 1. The width of one liner plate 1 is not so wide for easy handling. Therefore, immediately after excavation, the new liner plate 1 is connected to the lower part of the connecting edge 11 of the liner plate 1 assembled last time by bolts, and the liner plate 1 is sequentially extended downward. After reaching the prescribed support layer, the reinforcing bars are hung from the top and assembled along the wall of the hole, and then concrete is poured using a tremie pipe. The holes thus drilled are constructed as reinforced concrete piles. Since such piles can be constructed to have large diameters with simple equipment, they are highly useful as landslide prevention works in remote areas, steep slopes, and narrow places.

<B> Support Arm The support arm 2 is attached to the wall surface of the hole. As shown in FIG. 2, the support arm 2 is constructed by fixing horizontal plates 22 above and below a vertical plate 21, and horizontally projecting an arm plate 23 from the middle of the vertical plate 21. A receiving plate is horizontally provided at the tip of the arm plate 23. In this case, the arm plate 23 is provided so that the protruding direction is opposite to the protruding direction of the horizontal plate 22. The projecting width of the horizontal plate 22 is configured to be substantially equal to the width of the connection edge 11 of the liner plate 1, and the length of the vertical plate 21 is configured to be substantially equal to the width of the liner plate 1. Bolt holes are opened in the horizontal plate 22.

<C> Disc scaffold The disc scaffold 3 is a disc having a diameter smaller than the diameter of the hole, and the expanded metal or the like is attached to the upper surface of the frame assembled of steel material to form a floor, and the handrail is provided around the floor. 31 is provided. A worker rides on the upper surface of the floor plate of the disc scaffold 3 to assemble the reinforcing bar. Since a plurality of stages of disc scaffolds 3 are actually used as will be described later, an elevating port 32 is provided on the floor surface so that the worker can move upward and downward. By opening the elevator door 32 and lowering the ladder, it is possible to reciprocate with the disc scaffold 3 in the lower stage. A plurality of disk scaffolds 3 are prepared, and a wire engaging member is provided so that the disk scaffold 3 can be hung deeply inside from the upper part of the hole.

<D> Dimensions of Support Arm 2 and Disk Scaffold 3 The diameter of the disk scaffold 3 is smaller than the inner diameter of the hole, but too small is inappropriate. Therefore, when a plurality of support arms 2 are attached to the liner plate 1 of the hole wall, the diameter of the disc scaffold 3 is made larger than the diameter of the circle inscribed at the tips thereof. That is, the diameter of the circle inscribed at the tips of the plurality of support arms 2 is smaller than the diameter of the disc scaffold 3.

[0010]

[Construction method]

 <A> Attaching support arm 2 Attach support arm 2 to liner plate 1 before assembling rebars after drilling holes with liner plate 1 attached to the periphery. For that purpose, the disc scaffold 3 is hung from the upper part of the hole, the supporting arm 2 is once deposited on the connecting edge 11 of the liner plate 1, and the worker attaches the supporting arm 2 from below. In that case, three or more support arms 2 are attached to the same horizontal surface from the wall surface toward the center of the hole. The attachment is carried out by aligning the bolt holes of the horizontal plate 22 of the support arm 2 with the bolt holes of the connecting edge 11 of the liner plate 1 and penetrating the bolts.

<B> Mounting of Disk Scaffold 3 After the mounting of the support arm 2 at the lowermost stage is completed, the disk scaffold 3 is mounted on the receiving arm at the tip of the arm plate 23, and the bolt holes and the receiving holes of the disk scaffold 3 are received. Fasten the bolt through the bolt hole in the arm. Then, since the disc scaffold 3 becomes stable, a ladder on it is set up, and the upper support arm 2 is attached by an operator on the top of the ladder. When the mounting of the upper support arm 2 is completed, the upper disc scaffold 3 is hung and mounted on it. In this way, the work of mounting the upper support arm 2 from the disc scaffold 3 and mounting the upper scaffold on the support arm 2 is repeated, and the installation of the multiple disc scaffolds 3 is completed at regular intervals. In that case, a ladder for raising and lowering the worker is arranged between the upper and lower disc scaffolds 3 mounted on the respective support arms 2.

<C> Assembly of Reinforcement After the above work is completed, a worker is placed on each stage of the scaffold, and the assembly is performed while suspending the reinforcement from the upper part. When the assembly is complete, first lift the top scaffold, then remove the support arm 2 and then lift the next scaffold to remove all scaffolds and remove the concrete inside. Complete the construction of the pile by placing.

[0013]

[Effect of the present invention]

 Since the scaffold for deep foundation work of the present invention is as described above, the following effects can be obtained. <A> A circular scaffold can be installed in a circular hole to perform work. Therefore, since the distance from the surrounding wall surface is constant, workability is improved by using it as a guide for the reinforcing bar assembly interval. At the same time, the workers are extremely safe because they do not have to assemble in an unnatural posture. <B> The weight supported by the support arm of each step is only the weight on the scaffold of that step, and the weight is not added unlike the method of assembling the scaffold from the hole bottom to the top. Therefore, any number of scaffolds can be installed regardless of the depth, which is economical and safe. <C> Since the work is just to attach the supporting arm and mount the disc scaffolding on it, it is possible to assemble and disassemble without requiring any skill.

[Brief description of drawings]

[Figure 1] Illustration of the construction method using the scaffolding for deep foundation construction of the present invention

FIG. 2 is an explanatory view of a support arm and a liner plate.

[Fig. 3] Illustration of disk scaffolding

FIG. 4 is an explanatory diagram of an assembled state

Claims (2)

[Scope of utility model registration request] 1. A scaffold for use in deep foundation construction, in which reinforcing bars are assembled in a hole excavated in a cylindrical shape in the ground, and then concrete is placed, and a support arm to be attached to the wall surface of the hole and the hole. It consists of a disk scaffold hung from the upper part of the above, and when three or more support arms are attached from the wall surface toward the center of the hole, the diameter of the circle inscribed at the tips of these support arms is Scaffolding for deep foundation work 2. A scaffold used for deep foundation construction, in which a reinforcing bar is assembled in a hole excavated in the shape of a cylinder in the ground and then concrete is placed, and a supporting arm to be attached to the wall surface of the hole and the hole. It consists of a disc scaffold that is hung from the upper part of the above, a working disc has an elevating port, and three or more support arms are arranged in multiple stages from the wall to the center of the hole, and are mounted on each support arm. A scaffold for deep foundation work, in which a ladder for raising and lowering workers is placed between the upper and lower disc scaffolds.