JP2001241013A - Staging erection method in high pier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a staging erection method in a high pier of steel pipe or the like that enables easy and sure installation or removal of staging to or from a pier structure of a steel pipe or the like when construction requires. SOLUTION: By tilting a receiving bracket 10 that can be tilted at least upward or downward, a staging S can be mounted to, and is fastened to a pier structural material P, the staging S can be hangingly installed or removed along the pier structural material P without splitting the staging S concerned, when installing or removing the staging S.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing and operating a temporary scaffold necessary for repeatedly constructing or adding steel pipes and reinforcing bars of a predetermined length when constructing a pier of a bridge substructure. On scaffolding method at Takahashi pier.

[0002]

2. Description of the Related Art Long bridges or mountain bridges connecting islands and Honshu are often high piers due to their installation status. Such work is repeated, such as disposing the steel pipes in a well shape and adding and installing them upward, or adding reinforcing steel that has been started up from the foundation concrete part upwards with the completion of the pier structure.

[0003] In order to perform such a work, an annular scaffold temporarily provided on the outer periphery of the pier is required over several vertical steps. For example, if three stages of upper, middle and lower scaffolds are provided on the outer circumference of the steel pipe,
The upper scaffold is mainly used for welding the steel pipe and the built steel pipe in the next process and for the construction and assembling work of the rebar. The middle and lower scaffolds are used for the construction and assembling of the rebar, It can be used for surface treatment and various removal operations.

Conventionally, this scaffold has been mounted and fixed on a bracket welded to the surface of the steel pipe or the like.

[0005]

However, in the conventional scaffolding method, the bracket is fixed and has no mobility. Therefore, when installing or removing the scaffold, it is very difficult even to install or remove the scaffold unless the scaffold is divided in advance according to the minimum distance between the scaffolds, the bracket shape, and the like. Under such circumstances, for example, when trying to install or remove several steps of scaffolds, when installing or removing intermediate steps of scaffolding, etc., the scaffolding material must be measured from the side while measuring the distance between the upper and lower scaffolds. A complicated and delicate operation such as sliding in (or out) of the robot has been required. For this reason, installation of the intermediate scaffold was sometimes forgotten.

[0006] Further, in order to reliably install the scaffold with respect to a plurality of fixed brackets, although it is necessary to perform fairly accurate positioning, it is heavy due to the above-mentioned difficulty in construction. It has been difficult to position the scaffold efficiently. For this reason, there has been a frequent problem that a positional mismatch is confirmed after the scaffold is once placed on the bracket, and the positioning and fixing work must be performed again.

[0007] However, if the temporary work requires complicated and delicate work as described above, the cost of this work and the adverse effect on the construction period cannot be overestimated, and this deteriorates the construction environment. This led to an unneeded reduction in the number of scaffolding steps, which was a predisposition to creating a vicious cycle of reduced efficiency during the construction cycle.

Accordingly, the present invention has been made in view of such a conventional problem, and it has become possible to easily and surely install or remove a scaffold on a pier structure such as a steel pipe as required in construction. To provide a scaffolding method for high piers.

[0009]

Means for Solving the Problems The present invention has been made to achieve the above-mentioned object, and when a pier is constructed by appropriately adding structural members such as steel pipes, a scaffolding method for temporarily providing a scaffold for this construction is provided. And at least one of the upper and lower sides can be turned over and the scaffold can be placed, and the receiving bracket fixed on the structural material is turned over when the scaffold is installed or removed. Thereby, it can be suspended and installed or removed along the structural material without dividing the scaffold.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an explanatory view showing the structure of a receiving bracket 10 used in the scaffolding method for a high pier according to the present invention. The receiving bracket 10 is mounted on a pier structure P such as a steel pipe via a mounting jig 11.
By making the connecting portion 12 with 1 a rotary type, a structure is provided that can be turned at least up and down. The connecting portion 12 has, for example, a pin-joining structure in which a steel rod is driven into the jig 11 main body and the turning base 12a is formed.
An arm-shaped receiving member 13 on which the scaffold S is actually mounted is present at the end of the connecting portion 12.

Receiving bracket 1 having such a structure
Although 0 means that a plurality of scaffolds are to be installed on the steel pipe P on which the scaffold is to be installed, the number and spacing of the installations are taken into account in consideration of the weight of the scaffold S to be placed, the load applied to the scaffold S, and the like. Determined according to the situation.

The receiving member 13 of the receiving bracket 10
For example, the fixing pin 12b (not the turning base 12a) of the engaging portion 12 may be pulled out. When the receiving member 13 that has been turned down is raised and fixed, The receiving member 13 may be pulled up around the pin at the base point 12a, and the fixing pin 12b may be driven so as to communicate with the mounting jig 11. Hereinafter, the procedure will be described assuming an operation of actually adding two-stage steel pipes.

FIG. 2 is an explanatory view showing a first step of a steel pipe refilling operation by a scaffolding method on a high pier according to the present invention. FIG. 3 is an explanatory view showing the second step, and FIG. 4 is an explanatory view showing the third step. is there. The steel pipe used here is, for example, a standard-sized steel pipe called "standard size".
Many have a diameter of 900 mm to 2000 mm and a length of about 10 m. The steel pipe is built integrally with, for example, a concrete pier foundation (underground or semi-underground) and successively added upward to obtain a desired pier height.

First, as shown in FIG. 2A, the A bracket 20 is set in a raised state, and the B bracket 21 above it is set in a turned state. Next, the scaffold S, which has been laid in the assembly yard on the ground, is connected to the first-stage steel pipe P1.
Suspended and transported from above, scaffold S
Is fixed to obtain the scaffold installation state shown in FIG. When the scaffold S is mounted on the A bracket 20 while being suspended and conveyed along the outer periphery of the steel pipe P1, the B bracket 21
Has no adverse effect on the transport operation since it has been turned over. In other words, the side that performs this transfer operation simply has the scaffold S along the outer periphery of the steel pipe P1.
It is not necessary to perform a delicate operation while carefully judging the distance between each scaffold and the bracket as in the related art.

Using the scaffold S installed as described above,
Work such as laying a reinforcing bar or a formwork or performing various other temporary works is performed. After this work is completed, the second-stage steel pipe P2 is replaced with the first-stage steel pipe P1.
At the time of the work of adding on top, as shown in FIG.
Bracket 20 is removed and B is used for additional work such as welding.
Only the scaffold S on the bracket 21 is left. Receiving brackets 22 and 23 are attached to the second-stage steel pipe P2 that has been extended, similarly to the first-stage steel pipe P1, so that the C bracket 22 is set in a raised state, and the D bracket 23 is set in a folded state. Is done.

The scaffold S is suspended and conveyed in the same manner as described above through the D bracket 23 that has been turned down,
2 and fixed. Subsequently, if the scaffold S is also installed on the D bracket 23, the scaffold installation status shown in FIG. When the three-stage scaffold is provided in this manner, the work of welding the steel pipe of the next process (for example, the third-stage steel pipe) and the already-installed second-stage steel pipe P2 and the installation / assembly of the reinforcing steel are performed on the uppermost scaffold. The work is carried out, and on the middle and lower scaffolds, in addition to the work of building and assembling the rebar, surface treatment of the piers, various removal work, and the like are performed.

When the various operations required for the first and second stage steel pipes P1 and P2 are completed, as shown in FIG. 4A, the scaffold S on the D-bracket 23 is lifted off and removed. The D bracket 23 is turned down, and the scaffold S on the C bracket 22 is removed in the same manner.
The scaffold S on the bracket 21 is also removed. When steel pipes need to be added to the second and subsequent stages, as shown in FIG.
The bracket 23 is raised again to mount and fix the scaffold S, and prepare for a re-working operation. After that, no matter how many steel pipes are to be added, it is possible to easily and surely quickly perform the scaffold installation and removal work by repeating the same procedure as described above.

However, the shape and structure of the connecting portion 12 of the receiving bracket 10 are not limited to those of the embodiment, but include a receiving member branched into an annular shape, a hook shape, or a multi-branched shape. However, any mechanism can be adopted as a mechanism for turning over as long as the mechanism can be turned over as well as the pin joint.

Also, the method of installing the receiving bracket 10 on the outer periphery of the steel pipe P and providing the scaffold S has been described. However, the installing place of the receiving bracket 10 is not limited to this outer periphery, but may be provided around a pier structure such as a steel pipe. There is no problem in any position.

[0020]

As described in detail above, the scaffolding method for a high pier according to the present invention is a scaffolding method for temporarily attaching a scaffold for this construction when constructing a pier by appropriately adding structural members such as steel pipes. At least one of the upper and lower sides and the scaffold can be placed, and the receiving bracket fixed on the structural material is turned over when the scaffold is installed or removed. Thereby, it can be suspended and installed or removed along the structural material without dividing the scaffold.

Therefore, according to the present invention, when the scaffold is installed or removed, the scaffold does not need to be divided in advance according to the minimum distance between the scaffolds or the shape of the bracket as in the prior art. It becomes possible to install or remove the scaffolding collectively by falling down.

Also, the positioning of the scaffold with respect to the receiving bracket can be easily and efficiently performed because the scaffold can be collectively installed / removed as described above, without requiring complicated and delicate work. Can be done.

[0023] Thus, the number of personnel, various devices, and their costs required for the scaffolding work are greatly reduced as compared with the conventional art, and the overall work has a remarkable effect on cost and work period.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a structure of a receiving bracket used in a scaffolding method for a high pier according to the present invention.

FIG. 2 is an explanatory view showing a first step of a steel pipe refilling operation by a scaffolding method on a high pier according to the present invention.

FIG. 3 is an explanatory view showing a second step of the steel pipe replenishing operation by the scaffolding method on the high pier according to the present invention.

FIG. 4 is an explanatory view showing a third step of a steel pipe refilling operation by a scaffolding method on a high pier according to the present invention.

[Explanation of symbols]

 P Steel pipe (pier structure material) S Scaffold 10 Receiving bracket

Claims (1)

[Claims] 1. A scaffolding method for temporarily constructing a scaffold for construction when constructing a pier by appropriately adding structural members such as steel pipes, wherein the scaffold can be turned over at least one of up and down and the scaffold is placed. It is possible that the receiving bracket fixed on the structural material is turned over when installing or removing the scaffold, so that the mounting bracket is suspended or installed along the structural material without dividing the scaffold. A scaffolding method for high piers, which is possible.