JPS5930842B2 - How to build a long concrete bridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of pouring concrete girders in appropriate section lengths during construction of a long concrete bridge.

Conventionally, when the girder cross section of a concrete bridge has a relatively long span between the piers, a box-jointed girder a is used, such as the one chamber shown in FIG. 1 or the two chambers shown in FIG. 2.

To construct this, as shown in Figure 3, a mobile construction machine d is installed on the girder C at the top of the pier, a formwork e is suspended from the mobile construction machine d, and concrete is poured into the formwork e. Pour the first
A box-shaped girder a as shown in the figure or FIG. 2 is cast for each appropriate section length, and the girders are constructed by successively joining them.

However, the distance between the piers, or the span, is, for example, 20
If the girder is very long, such as 0 meters or more, or if the vehicle load is extremely large, the height h of the girder will be large from the viewpoint of strength, so the above-mentioned mobile load speculator and formwork will be huge, making construction difficult. Along with this, the cost also increases.

The object of this invention is to enable the construction of girders with long and large spans using conventional erection machines.

This invention is a concrete bridge in which concrete girders are constructed by pouring concrete into sections of appropriate length, and the concrete girders are divided into upper girders and upper girders. A method for constructing a long concrete bridge characterized by constructing an upper girder in a manner that follows the constructed lower girder as the bridge is constructed so that the upper girder and the upper girder become an integrated concrete girder. It is.

This will be explained below based on the drawings.

The cross-section of the concrete girder 1 that has been completed has the shape of two wheels arranged vertically, as shown in Fig. 4.As shown in Fig. 5, the upper girder 2 has a box cross-section with a slab 4 on the upper surface. The girder has a π-shaped cross section as shown by the dashed line.

To construct this, from the upper girder 2a constructed on the pier 5 as shown in Fig. 6, the upper girder 2 is successively divided into appropriate section lengths using a formwork suspended from a mobile construction machine as explained in Fig. 3. Repeat every t.

After constructing the upper girder 2 to a certain extent, the upper girder 3 is constructed using the slab 4 on the upper surface of the upper girder 2 with movable shoring, etc., and the upper girder 3 is installed near the center between the piers 5 shown in FIG. 5
Connect the girder constructed from

As explained above, when constructing a long concrete bridge, this invention allows the use of conventional formwork and mobile erection machines by constructing the concrete girder separately into the upper girder and the upper girder. Concrete bridges can be built.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing a cross section of a conventional girder, Figure 3 is an explanatory diagram of the construction of a conventional girder, Figures 4 and 5 are diagrams showing a cross section of a concrete girder according to the present invention, 6 and 7 are explanatory diagrams showing the construction method of this invention. 1... Concrete girder, 2... Upper girder, 3... Upper girder, 4... Slab.

Claims (1)

[Claims] 1 Concrete girders are constructed by pouring concrete into appropriate sectioned lengths.In concrete bridges, the concrete girders are divided into upper girders and upper girders, and the upper girder with a slab on the top is constructed first. This method of constructing a long concrete bridge is characterized by constructing an upper girder on top of the constructed lower girder so that the upper girder and the upper girder become an integrated concrete girder.