JPH06185013A - Construction method of column head section of pc diagonal tension bridge - Google Patents

Abstract

PURPOSE:To reduce the cost of a shoring material and shorten the construction period by providing an operation movable car to a scaffolding consisting of a bracket shoring projected to the head of a bridge pier and wire members hanging and holding a main girder, and using the operation car for the operation scaffolding. CONSTITUTION:A general scaffolding is assembled by diagonals 6 and a horizontal bracket shoring on a bridge pier 1, and after one or two blocks of a main tower 4 is constructed, the general scaffolding is removed to provide wagons 9 instead thereof. A climbing pole 10 is built up in a block part of the main tower 4, and the main tower 4 is constructed up to the top thereof by the climbing pole. After that, both right and left wagons 9 are used for scaffoldings to assemble a construction shorting 11 of a column head section 2 and a form, and bar arrangement, concrete placement, etc., are executed to carry out work of the column head section 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a pillar head of a PC cable-stayed bridge.

[0002]

2. Description of the Related Art Conventionally, as a construction method of a PC cable-stayed bridge, an overhanging method using a mobile work vehicle (hereinafter referred to as "wagen") is generally known. This kind of construction method is to install an overhanging part on the pillar head of the pier so that a wagon can be assembled using bracket support work, assemble the wagen here, and send this wagen forward in order to build the main girder. Is. That is, a wagon is installed by projecting from the existing part of the main girder to a section adjacent to the existing part of the main girder, and the formwork is assembled, the reinforcing bars are reinforced, and the PC is installed on the wagon.
Steel is installed, concrete is placed and cured, and the work is done block by block. In this case, first, the construction is started from the pillar.

Conventionally, the pillar heads have been constructed by constructing a bracket support work projecting horizontally on the top of the pier without using a wagon, and forming a total scaffold on the bracket support work.

[0004]

However, since this bracket support work needs to be assembled in a considerably wide scale,
Since a large amount of supporting material is required, the supporting material cost is increased, and much time and labor is required for assembling and disassembling the supporting material, and there is a problem that the construction period cannot be extended.

The present invention has been made in order to solve the above problems, and provides a method for constructing a stilt head of a PC cable-stayed bridge, which can reduce the cost of supporting materials and the construction period. The purpose is to

[0006]

According to the method of constructing a column head of a PC cable-stayed bridge according to the present invention, a mobile work vehicle is mounted on the top of a pier, and a support bracket and a main girder projecting from the top of the pier are suspended. It is temporarily supported with a diagonal member that supports it, and this mobile work vehicle is used as a scaffolding for supporting pillars and assembling formwork, reinforcing bar reinforcement, PC steel material installation, concrete placement, etc. And perform the stigma.

[0007]

EXAMPLE FIG. 6 shows an example of a PC cable-stayed bridge. In the figure, reference numeral 1 is a pier portion of a PC cable-stayed bridge, 2 is a column head, 3 is a corbel part, 4 is a main tower, 5 is a main girder, Reference numeral 6 is a diagonal member that supports the main girder 5 on the main tower 4. Moreover, FIGS.
Shows an embodiment of a method for constructing a stilt head of a PC cable-stayed bridge according to the present invention. Hereinafter, a method for constructing a PC cable-stayed bridge will be described in order with reference to the drawings.

[0008] A horizontally supported bracket support 7 is assembled on the top of the pier 1 of the PC cable-stayed bridge, and the corbel part 3 of the PC cable-stayed bridge is constructed using the bracket support 7 as a work scaffold (see FIG. 1 (a ), (b)). In this case, the bracket support 7 is small in size in order to reduce the support material as much as possible and to reduce the number of days required for assembly and disassembly as much as possible.

Next, a total scaffold 8 is assembled on the bracket support work 7, and the total scaffold 8 is attached to the main tower 1 of the main scaffold 3.
Build blocks or 2 blocks (see Figures 2 (a) and 2 (b)).

Next, when 1 block or 2 blocks of the main tower 4 can be constructed, the total scaffold 8 is dismantled and removed, the main girder 5 is replaced with this total scaffold 8, and a wagon 9 for erection by the construction method is installed. To do. The base end side of the wagon 9 is supported by a bracket support 7, and the tip end side is supported by a diagonal member 6 suspended from an existing part of the main tower 4. As the wagen 9, a conventional one is used, and the left and right main girders 5 are installed on both sides so that they can be simultaneously installed in parallel.

Further, the climbing home 10 is assembled on the two blocks of the main tower 4, and the portions above the climbing home 10 are sequentially constructed by the climbing home 10 to the top (FIG. 3).
(See (a) and (b)).

On the other hand, at the same time as the construction of the main tower 4 or after the construction of the main tower 4, the left and right wagons 9 are used as work scaffolds, and the supporting works 11 for the construction of the pillar head 2, the assembly of the formwork, and the arrangement of the reinforcing bars. The column head 2 is constructed by installing reinforcements, PC steel materials, placing concrete, etc. (see Fig. 3 (a), (b)).

When the construction of the pillar head 2 is completed, the wagon 9 is used and the entire length of the main girder 4 is continuously constructed on the pillar head 2 by the overhanging method (see FIGS. 4 and 5). in this case,
It is assumed that the column head 2 is fixed to the support 11 by the anchor member 12 so as not to move.

The bracket support work 6, the wagon 9 and the support work 11 are removed when the main girder 5 is completed.

[0015]

As described above, the P according to the present invention
According to the method for constructing the stilts of the C cable-stayed bridge, the wagon for constructing the main girder is used as a work scaffold, and the support for stilts construction is assembled on this, and the formwork, rebar, and PC steel are assembled. Since the pillar head is constructed by pouring concrete, the large-scale bracket support work that was required in the past is no longer necessary, and the assembly and removal work of bracket support work can be omitted. And the construction period can be greatly shortened.

[Brief description of drawings]

FIG. 1 (a) is a front view showing a construction process of an embodiment of a method of constructing a stilt head of a PC cable-stayed bridge according to the present invention, and FIG. 1 (b) is a side view thereof.

FIG. 2 (a) is a front view showing a construction step of an embodiment of a method of constructing a stilt head of a PC cable-stayed bridge according to the present invention, and FIG. 2 (b) is a side view thereof.

FIG. 3 (a) is a front view showing a construction process of an embodiment of a method for constructing a stilt head of a PC cable-stayed bridge according to the present invention, and FIG. 3 (b) is a side view thereof.

FIG. 4 is a front view showing a construction process of an embodiment of a construction method of a pillar head portion of a PC cable-stayed bridge according to the present invention.

FIG. 5 is a side view showing a construction process of an embodiment of a construction method of a pillar head portion of a PC cable-stayed bridge according to the present invention.

FIG. 6 is a side view showing an example of a PC cable-stayed bridge.

[Explanation of symbols]

1 ... PC cable-stayed bridge pier, 2 ... Pillar head, 3 ... Corbel part, 4 ... Main tower, 5 ... Main girder, 6 ... Bracket, 7 ... Bracket support, 8 ... Total scaffolding, 9 ... Wagen, 10… Climbing home, 11… Support work, 12… Anchor member.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Shinsada Aizu 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Kazuyuki Abe 1-2-2 Moto-Akasaka, Minato-ku, Tokyo No. 7 Kashima Construction Co., Ltd. (72) Inventor Kyoyoshi Ito 1-chome, Moto-Akasaka, Minato-ku, Tokyo No. 7 No. 7 Kashima Construction Co., Ltd. (72) Inventor, Gen-Akasaka, Minato-ku, Tokyo 1-chome No. 2-7 Kashima Construction Co., Ltd.

Claims (1)

[Claims] 1. A method for constructing a PC cable-stayed bridge in which a main girder of a PC cable-stayed bridge is constructed while supporting it on the main tower by diagonal members by an overhanging method using a mobile work vehicle, wherein the mobile work vehicle is installed at the top of a pier. Is temporarily supported by the support bracket and the diagonal member that are projected on the top of the bridge pier, and this mobile work vehicle is used as a work scaffold to assemble the support and the formwork for the stilt head construction,
A method of constructing a pillar head of a PC cable-stayed bridge, which comprises arranging reinforcing bars, installing PC steel, and placing concrete.