JPH0689527B2 - Construction work vehicle for PC cable-stayed bridge - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a construction vehicle for a PC cable-stayed bridge, which is mainly used for an extension method of a main girder of a PC cable-stayed bridge.

[Conventional technology]

Generally, when the main girder of a PC cable-stayed bridge is a box girder, a bulkhead and a transverse girder are installed at a right angle to this.

This cross girder is installed in the main girder at right angles to it when the diagonal member arrangement is so-called single-sided suspension, and in the case of double-sided suspension, it is installed inside and outside the main girder at right angles to it. The diagonal member is fixed to this cross beam.

When a bridge girder with a box girder cross section of this kind uses an inner formwork installed inside the bridge girder and an outer formwork installed outside, as a formwork, and is constructed by cast-in-place concrete by the so-called overhanging method. There are many.

[Problems to be Solved by the Invention]

However, according to this overhanging method, it is relatively easy to construct the middle part between the cross beams (hereinafter referred to as "standard block B"), but the part where the cross beams are provided (hereinafter " The construction of the diagonal member placement block C ") requires that the concrete of the main girder and the transverse girder be integrally placed in the structure, so the inner and outer molds of the standard block B are temporarily removed,
It was necessary to separately prepare the formwork of the diagonal block placement block C and replace it with the formwork of the standard block.

For this reason, not only smooth construction cannot be expected, but also the process of overhanging construction is greatly affected, and there is a difference of 3 days or more between the process of standard block B and diagonal block placement block C, and the construction period cannot be extended. there were.

Further, the installation of the diagonal member fixing member and the diagonal member protection tube is generally troublesome.

Further, since the inner mold and the outer mold are installed in a substantially fixed type with respect to the main body of the erection work vehicle (space truss) and have a structure that is almost immovable, there is no freedom of the mold.

This invention was proposed in order to solve the above-mentioned conventional problems, and it has made it possible to shorten the process for overhanging a PC cable-stayed bridge and to rationalize the installation of diagonal and diagonal protection pipes.
The purpose is to provide an erection work vehicle for a cable-stayed bridge.

[Means for solving the problem]

This invention is a PC used for overhanging the main girder of a PC cable-stayed bridge.
Concerning erection work vehicles for cable-stayed bridges, multiple trolley rails are installed on the main body of the erection work vehicle used for the PC cable-stayed bridge extension method in a direction substantially parallel to or perpendicular to the span direction of the main girder. A structure in which an inner form or an outer form for constructing a standard block of a main girder is suspended by using a trolley on a rail, and the inner form or the outer form can be freely moved with respect to the erection work vehicle body. By doing so, the above object is achieved.

〔Example〕

Hereinafter, the present invention will be described based on an illustrated embodiment.

FIGS. 1, 2 and 3 show a construction vehicle for a PC cable-stayed bridge (hereinafter referred to as “construction vehicle”). The construction vehicle 1 has a plurality of horizontal beams 2, 2. It is installed at a right angle to the main girder A. A plurality of trolley rails 3, 3 are installed on the lateral beams 2, 2.

The trolley rails 3, 3 are substantially parallel to the main girder A, and the main girder A
Are installed at regular intervals in the width direction. A plurality of trolleys 4, 4 are installed on the trolley rails 3, 3, respectively.

The trolleys 4, 4 are installed so that they can freely slide on the trolley rails 3, and the inner formwork 6 is suspended on the trolleys 4, 4 via suspension wires 5, 5.

A pedestal 7 is hung on the cross beam 2 via suspension wires 5 and 5, and an outer frame 8 is installed on the pedestal 7.

The inner formwork 6 is configured to move freely in the front-rear direction of the main girder A while being suspended as the trolleys 4, 4 move. The inner mold 6 and the outer mold 8 are molds for constructing the standard block B of the main girder A.

Further, the erection work vehicle 1 is provided with a plurality of rails 9 and 9 and a plurality of wheels 10 and 10 running on the rails 9 and 9.

The rails 9 and 9 are arranged on the upper floor plate of the main girder A substantially parallel to the main girder A,
In addition, depending on the width of the main girder A, the main girders A are laid at regular intervals in the width direction.

In addition, the wheels 10, 10 receive power from the drive unit 11 and
It is possible to drive on the rails 9 and 9 by itself, so that the erection work vehicle 1 can hang the pedestal 7 on which the inner mold 6 and the outer mold 8 are placed and to travel on the rails 9 and 9. it can.

A support roll 12 is attached to the erection work vehicle 1,
The erection work vehicle 1 is prevented from tipping forward due to the weight of the inner mold 6 and the outer mold 6 during traveling.

In addition, the erection work vehicle 1 has a main jack and a wagon anchor (not shown) so as not to move or tilt during the work.
It can also be fixed by.

Incidentally, reference numeral 15 in the figure is a work scaffold, which is attached to the cradle 7. In such a structure, next, a method of constructing the main girder A by the erection work vehicle 1 will be described step by step.

The erection work vehicle 1 is firmly fixed on the upper deck of the diagonally arranged block C of the main girder A, which has just been constructed, by the main jack and the wagen anchor so as not to fall (4th
See figure).

The inner formwork 6 and the cradle 7 are hung on the trolley rails 3 and the outer formwork 8 is placed on the cradle 7.

Subsequently, the inner formwork 6 and the outer formwork 8 are set at the tip of the diagonally arranged block C of the main girder A that has just been constructed (fourth form).
See figure).

In this case, remove the rear end of the inner formwork 6 from the trolley 4,
Place it on the lower floor plate of the diagonal member arrangement block C that has just been installed, and hang only the tip end on the trolley 4.

Subsequently, the necessary reinforcing bars and PC steel materials are installed between the inner mold 6 and the outer mold 8, and then concrete is poured to fully cure (see FIG. 4).

Then, when the concrete develops sufficient strength, the PC steel material is tensioned to introduce prestress.

By this method, the standard block B of the main girder A is constructed.

Then, the inner mold 6 and the outer mold 8 are released.

Wheels 10 are attached to the rear end of the inner mold 6 so that the inner mold 6 can be pulled out smoothly.

Subsequently, the anchor members 13, 13 of the rails 9, 9 are temporarily removed, and only the rails 9, 9 are moved onto the upper floor board of the standard block B of the main girder A just installed.

Then, the rails 9, 9 are fixed again by the anchor members 13, 13.

Then, the main jack and the wagon anchor of the erection work vehicle 1 are temporarily removed, and the erection work vehicle 1 is run on the rails 9 and 9 while the cradle 7 on which the inner formwork 6 and the outer formwork 8 are placed is suspended. Then, the main girder A is moved to the tip of the standard block B just constructed.

Then, the erection work vehicle 1 is firmly fixed again on the standard block B by the main jack and the wagen anchor so as not to move (see FIG. 5).

Then, the trolley 4 suspending the inner formwork 6 is slid forward of the trolley rail 3 to move only the inner formwork 6 further forward (see FIG. 6).

Next, install the inner and outer forms (not shown) of the diagonal block placement block C at the tip of the standard block B just built, and install the necessary reinforcing bars and PC steel in this form. (See FIG. 7).

Further, the diagonal member fixing body 14 and the diagonal member protection tube are installed at predetermined positions, and concrete is poured to fully cure them (see FIG. 7).

The diagonal member fixing member 14 and the diagonal member protection tube are installed by using the trolleys 4, 4 similarly to the inner formwork 6, so that the working efficiency is improved.

Then, when the concrete exhibits sufficient strength, the form of the diagonal member arrangement block C is removed.

Next, temporarily remove the anchor members 13 and 13,
9,9 Main girder A, diagonal construction block C just installed
Move to the upper floor slab.

Then, the rails 9, 9 are fixed again by the anchor members 13, 13.

Then, the main jack of the erection work vehicle 1 and the wagon anchor are temporarily opened, and the erection work vehicle 1 is run on the rails 9 and 9 to the tip portion of the diagonal member arrangement block C of the main girder A just installed. Move (see FIG. 8).

Then, the erection work vehicle 1 is mounted on the main girder A with the main jack,
Secure it again so that it will not move with the wage anchor.

Subsequently, the trolley 4 suspending the inner formwork 6 is slid to the rear of the trolley rail 3 to move the inner formwork 6 to the rear of the main girder A, and the tip end portion of the diagonal member arrangement block C just installed. Again (see FIG. 8).

Then, the work from to is performed again to construct a new standard block B.

Hereinafter, similarly, the construction of the standard block B and the construction of the diagonal member arrangement block C are alternately performed to construct the entire length of the main girder A.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

It is necessary to perform the construction of the standard block and the construction of the diagonal block alternately, but the formwork of the standard block is installed in the trolley rail of the erection work vehicle by using the trolley, and is installed in the span direction of the main girder. Since it is hung so that it can move freely, its installation and removal work can be done easily.

Therefore, it is possible to extremely quickly and easily change the form of the standard block and the diagonal member arrangement block, and it is possible to significantly reduce the process and the construction period.

Further, the diagonal member fixing body and the diagonal member protection tube can be installed quickly and easily by using the trolley.

[Brief description of drawings]

1, 2 and 3 show a construction vehicle for a PC cable-stayed bridge according to the present invention. FIG. 1 is a side view thereof, and FIG.
The figure shows a partial front view, and FIG. 3 shows a partial cross-sectional view of the central portion.
Figures 8 to 8 are process diagrams showing the method of constructing the main girder using the PC cable-stayed bridge erection work vehicle. 1 ... Erection work vehicle, 2 ... Horizontal beam, 3 ... Trolley rail, 4 ... Trolley, 5 ... Hanging wire, 6 ... Inner mold, 7 ... Cradle, 8 ... Outer mold, 9 ...... Rail, 10 ...
… Wheels, 11 …… Driving device, 12 …… Supporting roller, 13 …… Anchor member, 14 …… Slanting material fixing body, 15 …… Work scaffolding.

Claims (1)

[Claims] [Claim 1] A plurality of trolley rails are installed on a main body of an erection work vehicle used for a PC cable-stayed bridge overhanging method in a direction substantially parallel to or perpendicular to the span direction of the main girder, and the trolley is used for the trolley rails. The inner form or the outer form for constructing the standard block of the main girder is hung so that the inner form or the outer form can be freely moved with respect to the erection work vehicle body. Construction work vehicle for PC cable-stayed bridge.