JPS649404B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a structure suitable for use in pouring bridges, viaducts, buildings, and other girder-supported structures using the prestressing method, particularly for pouring wide girder-supported floor plates. Concerning construction methods.

In order to construct a long bridge using this construction method, for example, a movable scaffold called a "Falbauwagen", that is, a main truss, is usually used, and the long bridge is constructed by sequentially pouring concrete.

The main truss is movable on rails installed on the deck of the existing bridge body, and once the concrete has been poured and hardened in a designated section using the main truss, the bridge body with new rails attached can be moved. The main truss is moved forward along the rail, and the main truss is used to carry out work such as installing formwork, pouring concrete, and introducing prestress.

By the way, if the deck width of the long bridge being constructed is wide, a larger main truss will be required.
Also, the load on the bridge girder is large.

In the case of a structure supported by girders, such as a long bridge, where the width of the floorboard is wide, the present invention enables the construction of a smaller main truss than the conventionally used main truss and side castings by dividing the floorboards into parts. This design allows the construction to be carried out using the main truss, and also reduces the load on the bridge girder.

Therefore, in the present invention, concrete is poured in the center of the floorboard for a predetermined length using a main truss, and once the concrete has solidified, concrete is poured in the center of the floorboard on both sides of the finished floorboard center. This is done using a main truss for side pouring that is smaller than the one used for the construction.

If such a construction method is adopted, it is possible to perform continuous construction, including pouring concrete in the center of the floorboard and pouring concrete on the sides of the floorboard, and the construction period can even be shortened compared to conventional methods.

Embodiments of the present invention will be described below with reference to the drawings, taking as an example a case where a wide and long bridge is constructed using the construction method of the present invention.

First, the main truss is used to pour concrete for the central part of the long bridge onto the girder for a predetermined length (predetermined sections). Once the concrete has hardened, concrete is poured for the side floorboards for a specified length. That is, in the figure, 1 shows the existing bridge girder, and 2a shows the floorboard of the central part of the long bridge, which has been poured using the main truss. As the main truss for pouring the central floorboard, a conventionally known main truss that runs in the longitudinal direction on rails laid on the existing floorboard and is equipped with a work scaffold on the advancing direction side can be used.

Following the pouring of the central floorboard 2a, the side floorboards 2b following the central floorboard 2a are cast using the main truss 3 for side pouring, which is smaller than the main truss used for central pouring. conduct. The main truss 3 for side pouring has a frame 4 projecting to the side perpendicular to the direction of movement, and a work scaffold 7 is suspended from the frame 4 with a wire rope 5 or a rod 6. Using this work scaffold 7, work such as formwork installation, concrete pouring, prestress introduction, etc. is carried out, and the side floorboards 2b are poured to a predetermined length. Although only one side is shown in the figure, the floor plates 2b, 2b on both sides are normally poured at the same time.

The main truss 3 for side pouring is designed to be able to run on two rails 8, 8 (Fig. 1) laid at the center of the existing floorboard 2a, and concrete pouring for the side portions 2b progresses. The main truss 3 for side pouring is then moved in the longitudinal direction.

The rear end of the main truss 3 for side pouring generates a moment that tends to overturn the main truss 3 for side pouring due to the load from the work scaffold 7 etc. supported by the main truss 3 for side pouring. An anchor jack 9 is provided at , and the anchor jack 9 presses the rear end of the main truss 3 for side pouring in the direction of the floorboard 2a.

When the side floor plate 2b of a predetermined length has been cast in this way, the central floor plate 2b is recast to a predetermined length using the main truss for center pouring, which is larger than the main truss 3 for side pouring. Pour concrete. In this case, the main truss is raised with a jack, moved to the floor plate 2a side of the central part where the rails have been added, and the main truss is advanced along the rails to perform concrete pouring, which is the same as in the conventional method.

Once the concrete on the floor plate 2a in the central part has solidified, the main truss 3 for side pouring is raised using jacks (not shown), the two rails 8, 8 (Fig. 1) are moved, and the two rails 8, 8 (Fig. 1) are moved. Rails 8, 8 (first
The main truss 3 for side pouring is moved forward along the direction shown in the figure), and the side floor plate 2b is poured. Afterwards, the same process is repeated to build a long bridge.

Note that the entire length of the center portion of the floor board may be completed in advance and then the side portions of the floor board may be constructed, or the center portion of the floor board may be constructed and then the side portions of the floor board may be constructed. . The key is to install the floorboards in two parts: the center part and the side parts.
Following the pouring of the center floor plates, the side floor plates will be poured.

As explained above, according to the construction method of the present invention, even a structure with a wide floor plate can be constructed using a main truss and a main truss for side pouring that are smaller than the main truss used in the conventional construction method. In addition, the load applied to the girder is small and does not have any negative impact on the girder. In addition, the construction of the central part of the floorboard and the construction of the side parts of the floorboard following the existing central part can be carried out at the same time, allowing the work to proceed more efficiently and shortening the construction period rather than construction using a single large main truss. I can do it.

[Brief explanation of drawings]

The drawings show an example of implementing the construction method of the present invention,
FIG. 1 is a front view showing a long span bridge being constructed using the construction method of the present invention, and FIG. 2 is a side view of the same. 1...Girder, 2a...Central floor plate, 2b...Side floor plate, 3...Main truss for side pouring, 4...
... Frame, 5... Wire rope, 6... Rod body,
7...Work scaffold, 8,8...Rail, 9...Anchor jack.

[Claims]

1. Rails are laid on the existing floorboards where the girders of the elevated structure are located, a pair of left and right main trusses are installed that can move along the rails, and cross beams are fixed across the main trusses to support the weight of concrete, etc. In a construction method for an elevated structure in which the main truss is moved one after another to add floor plates, one main truss and the cross beam are connected with pins so that the main truss and the cross beam can rotate relative to each other in a horizontal plane, and the other The main truss and the cross beam are connected by pins so that the main truss and the cross beam can rotate relative to each other in the horizontal plane, and the main truss and the cross beam are connected by sliding so that they can move relative to each other in the horizontal direction in the horizontal plane. The lateral and angular displacements between the main truss and cross beams caused by changes in the rail spacing due to changes in rail spacing are absorbed by the relative movement and rotation between the main truss and cross beams, and the weight of concrete is always supported directly by the girder. A construction method for elevated structures characterized by adding floor plates one after another.