JPH1121815A - Bridge structure by composite steel floor board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a steel plate-made base function as strength member by fixing a composite steel floor board consisting of the steel plate-made base having recessed straps formed at prescribed intervals and a concrete layer formed on the upper surface side thereof onto the upper surface of a girder member of a main structure through the base. SOLUTION: A main structure 10 is formed of a pair of main girders 11 laterally arranged and horizontal girders 12 arranged at prescribed intervals between the main girders 11. A composite steel floor board 20 is formed of a skin plate 21 having trapezoidal recessed straps 21A provided at prescribed intervals so as to be extended in the axial direction of a bridge 1, and a concrete layer 22 of a prescribed thickness is provided on the skin plate 21. The main structure 10 is supported on a bridge pier 2 through a bearing. Further, the skin plate 21 is fastened and fixed to the upper surface of the main structure 10 by high tensile bolts and nuts. Thus, the skin plate 21 can be made to function also as the strength member of the bridge 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge structure using a steel composite slab for forming a bridge or an elevated road by using a composite steel slab formed of a steel plate and concrete.

[0002]

2. Description of the Related Art Conventionally, floor slabs constituting bridges and elevated roads include so-called RC slabs made of concrete reinforced by reinforcing steel and steel slabs using steel plates.

[0003] The RC floor slab is used for placing concrete in a formwork with a reinforcing bar inside the formwork, so that the work is troublesome and the construction period is long.

[0004] On the other hand, the steel deck is constructed by reinforcing a deck plate formed of a steel plate with a reinforcing rib member (longitudinal rib) provided on the lower surface thereof. This is constructed by a so-called prefabricated construction method of assembling to a predetermined size at a manufacturing factory, then transporting it to a construction site and mounting it on a pier, paving its surface with asphalt or the like, and using it. According to this, the structure can be made lighter than the RC floor slab, and the number of steps at the construction site is small and the construction period can be shortened.

[0005] However, since the steel slab is almost entirely formed of steel having a small specific heat and has a small heat capacity, the temperature change due to the influence of the outside air temperature is remarkable. There is a problem.

[0006] Such a problem is caused by the fact that R
This problem can be solved by forming a C concrete layer and using a so-called synthetic steel slab that makes use of the advantages of the steel slab and the RC slab.

[0007]

However, in a synthetic steel slab, the steel plate substrate constituting the lower surface functions as a formwork for casting concrete, and after the concrete has been cast, the strength member of the floor slab itself. However, after being supported by the main structure and assembled as a bridge, it hardly functions as a bridge strength member.

The present invention has been made in view of the above problems, and provides a bridge structure using a synthetic steel slab in which a steel plate substrate constituting the lower surface of the synthetic steel slab can also function as a bridge strength member. The purpose is to do.

[0009]

In order to achieve the above object, a bridge structure using a synthetic steel slab of the present invention has a concrete layer having a predetermined thickness on the upper surface side of a steel plate substrate having recesses formed at predetermined intervals. The formed synthetic steel floor slab is fixed to the upper surface of a girder member constituting a main structure via the steel plate substrate.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partial longitudinal sectional view of a bridge to which an example of a bridge structure using a synthetic steel floor slab according to the present invention is applied, FIG. 2 is a transverse sectional view thereof, and FIG. 3 is a partial sectional perspective view.

In the illustrated bridge 1, a main structure 10 composed of a main girder 11 and a horizontal girder 12 is supported on a pier 2 via a bearing 3, and a synthetic steel floor slab 20 is supported on the upper surface of the main structure 10. It is configured.

The main structure 10 includes a pair of main girders 1 on the left and right in the width direction.
1 are arranged, and the horizontal girder 12
Are arranged at predetermined intervals. The main girder 21 and the cross girder are each made of a steel plate and have a cross-sectional shape of I
The cross girder 12 is fixed by welding to the abdominal plate of the main girder 11 at the side edge, and is supported on the pier 2 at a cross-joining portion of the main girder 11 and the cross girder 12.

The synthetic steel floor slab 20 has a concrete layer 22 having a predetermined thickness on a skin plate 21 as a steel plate substrate.
As shown in FIG. 4, which is an enlarged view of a portion A in FIG.
The main girder 11 and the horizontal girder 12 are fixed to the main structure 10 by being fastened to the upper surface of the main girder 11 with the high-strength bolts and nuts 13.

The skin plate 21 has trapezoidal concave ridges 21A provided at predetermined intervals when viewed from the upper surface as a reference, and has a cross-sectional shape in which the top and bottom of a sinusoidal waveform are flattened. It is provided so that the extending direction of the concave streak 21A coincides with the bridge axis direction. Thereby, the concave streak 21
The bending strength of A in the extending direction (that is, the bridge axis direction) can be set to be extremely large as compared with the case of a flat steel plate even if the steel plates have the same thickness. In order to form the skin plate 21 into such a shape, as shown in FIG. 5, a trapezoidal shaped steel 22 opening upward is welded and joined at its upper edge flange portion 22A, or is press-formed to a certain size. What is necessary is just to form by welding and joining things.

Although not shown, a dowel (not shown) is provided on the upper surface of the skin plate 21 so that the concrete layer 22 can be connected so as to be relatively immovable. Although not shown, the concrete layer 22 is reinforced by disposing a reinforcing bar inside.

The bridge 1 is constructed by sequentially assembling the main structure 10 and the synthetic steel slab 20 separately, or transferring the main structure 10 and the synthetic steel slab 20 integrally formed in a factory to the site. Arbitrary process setting such as installation is possible. Further, even if the concrete layer 22 of the synthetic steel floor slab 20 is formed by casting on site after fixing the skin plate 21 on the main structure 10, the concrete layer 22 is previously cast on the skin plate 21 at the factory. It may be formed integrally with or any of them, and can be appropriately set based on the construction process.

According to the bridge structure as described above,
The skin plate 21 of the synthetic steel floor slab 20 has high mechanical strength in bending and compression in the extending direction (bridge axis direction in the present configuration example) due to the formation of the recess 21A. Since it is integrated with the main structure 10, it functions as a strength member in the bridge axis direction together with the main structure 10. That is, the skin plate 21 which is a component of the synthetic steel floor slab 20 functions not only as a form when forming the concrete layer 22 but also as a strength member similar to the main structure 10, which is extremely reasonable. It can be a configuration.

The skin plate 21 of the synthetic steel slab 20
21A is not limited to the shape of the above configuration example, but can be changed as appropriate.

The extending direction of the concave stripes 21A of the skin plate 21 is the bridge axis direction in the above configuration example, but is not limited to this, and can be appropriately set to a direction in which strength is expected. That is,
For example, as shown in FIG. 6 which is a partial cross-sectional perspective view (the reference numerals in FIG.
May be arranged in the width direction of the bridge 1 (direction orthogonal to the bridge axis). According to this, the cross beam 12 of the main structure 10
Function as a strength member in the width direction so as to reinforce.

[0020]

As described above, according to the bridge structure using the synthetic steel slab according to the present invention, a concrete layer having a predetermined thickness is formed on the upper surface side of the steel plate substrate having the ridges formed at predetermined intervals. Is formed and fixed to the upper surface of the girder member constituting the main structure via the steel plate substrate, so that the steel plate substrate is higher in the extending direction of the concave streak. Mechanical strength is obtained, and it functions not only as a component of the synthetic steel slab but also as a strength member of a bridge. For this reason, the synthetic steel slab can be configured with high strength, the main structure can be reduced in weight, and the bridge can be rationally configured.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view of a bridge to which an example of a bridge structure using a synthetic steel slab according to the present invention is applied.

FIG. 2 is a cross-sectional view thereof.

FIG. 3 is a partial sectional perspective view thereof.

FIG. 4 is a partially enlarged view of FIG. 2;

FIG. 5 is a partial cross-sectional view showing a manufacturing process of the skin plate.

FIG. 6 is a partial longitudinal sectional view of a bridge which is another configuration example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bridge 10 Main structure 11 Main girder (girder member) 12 Cross girder (girder member) 20 Synthetic steel floor slab 21 Skin plate (steel board made of steel plate) 21A Concave strip 22 Concrete layer

Claims (3)

[Claims] 1. A synthetic steel floor slab in which a concrete layer having a predetermined thickness is formed on the upper surface side of a steel plate substrate having recesses formed at predetermined intervals constitutes a main structure via the steel plate substrate. A bridge structure comprising a synthetic steel slab fixed to an upper surface of a girder member. 2. The bridge structure using a synthetic steel slab according to claim 1, wherein the steel plate substrate is disposed with the extending direction of the concave streak parallel to the bridge axis direction. 3. The bridge structure using a synthetic steel floor slab according to claim 1, wherein the steel plate is disposed so that a direction in which the concave strip extends is perpendicular to a bridge axis direction.