JPH0349126Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention enables the main girder span to be increased by adopting a configuration using a specially configured main girder and bridge deck slab, and also reduces construction costs. It also relates to the structure of a viaduct that can save labor in construction.

"Conventional technology" Reduction of construction costs in viaduct construction work,
In addition, with the aim of improving construction efficiency, in recent years, when constructing some viaducts, factory-produced cast-in-place synthetic deck slabs have been installed on top of the steel girders, replacing reinforcing bars that had previously been done on site. Processing and reinforcement work,
Furthermore, while a structure that greatly simplifies formwork work and reduces construction costs is adopted, the main girder and deck slab are both made of steel, and the span of the bridge girder is Steel deck bridges, which have structures that can be set larger than conventional ones, are being adopted.

``Problems that the idea aims to solve'' By the way, there are many ways to reduce construction costs, improve workability,
Alternatively, if further consideration is given to the structure of conventional viaducts for the purpose of improving workability in bridge deck replacement work, it is possible to Therefore, it is possible to reduce construction costs by setting the span of the steel girder larger than before, but if the span is set larger, the thickness of the deck slab must be increased in anticipation of an increase in the dead load acting on the deck slab. There is a problem where cost reduction cannot be expected due to necessity. In addition, the aforementioned conventional steel deck bridges have the problem of being about five times more expensive than bridges using concrete deck slabs, and they also require replacement work for the deck slabs. In order to do so, it is necessary to dismantle and construct the entire bridge deck, making replacement work difficult.

The present invention was developed in view of the above circumstances, and allows the span of the main girder to be set larger than that of conventional viaducts using concrete deck slabs, and in that case, the thickness of the deck slab can be set larger than that of conventional viaducts using concrete slabs. The objective is to provide a viaduct structure that can be formed thinner than concrete deck slabs, reducing construction costs and improving workability, as well as having good workability during replacement work. shall be.

"Means for Solving the Problems" In order to solve the problems mentioned above, the present invention has been developed by installing a steel flange slab on top of the main girder installed adjacent to the main girder and extending it to the side of the main girder. The bridge deck is supported by connecting both ends of these flange decks between the adjacent and opposing flange deck slabs, and supporting the bridge deck;
A bridge deck base is constructed from the flange deck slab and the bridge deck slab.

"Function" The flange deck integrated into the main girder supports the bridge deck, and the steel flange deck and the bridge deck both support the load, reducing the load acting on the bridge deck. do. Therefore, even if the main girder span is set larger than that of conventional viaducts and the number of main girders is reduced, the deck slab can be made thinner than conventional viaducts. In addition, when replacing the bridge deck, the bridge deck can be separated from the flange deck and replaced, and the flange deck can be used to move the replacement machine, making it easier to carry out the replacement work. Improves sex.

``Example'' Figures 1 and 2 show an example of the present invention. In Figure 1, 1 and 2 extend in the axial direction of the bridge and are arranged at a predetermined distance from each other. Two of the multiple steel main girders are shown.

These main girders 1 and 2 are connected to a web 3 and this web 3
a lower flange 4 formed at the lower end of the web 3;
It is mainly composed of a flange floor slab 5 integrally formed on the upper part of the flange floor slab 5.

The flange floor plate 5 includes a flange-shaped floor plate 6 that is integrated with the upper end of the web 3 at right angles to the web 3, and is connected to both sides of the web on the lower side of the floor plate 6 and extends obliquely upward. Reinforcement plate 7
and a connecting plate 8 that joins the tips of the floor plate 6 and the reinforcing plate 7, and the width of the floor plate 6 and the reinforcing plate 7 is formed to be several times the width of the lower flange 4. ing. In addition, a groove 9 is formed on both sides of the flange floor slab 5 in the width direction, and is defined by the tip of the floor plate 6, the tip of the reinforcing plate 7, and the connecting plate 8. On the lower side, a support plate 1 is fixed to the tip edge of the reinforcing plate 7 and projects forward from the tip edge of the floor plate 6.
0 is fixed.

Between the opposing flange deck slabs 5, 5, a bridge deck 12 is supported with its both ends inserted into the groove 9 and its upper surface substantially flush with the upper surface of the flange deck slabs 5, 5. A bridge deck base is constituted by the bridge deck slab 12 and the flange deck slabs 5,5.

In the case of this embodiment, the bridge deck slab 12 is a steel band plate,
Alternatively, a large number of reinforcing members 16 formed by bending steel rods in a diagonal manner are arranged and fixed in parallel on the upper surface of the bottom plate 17, and further reinforcing bars are placed around these reinforcing members 16.
The floor unit 20 is constructed by placing concrete on a floor unit 20, which is constructed by disposing a floor unit 8.

Furthermore, in the flange deck slab 5 of the main girder 1 shown in FIG.
A concrete protective wall 22 (vehicle stop) is formed on the upper surface of the left end of the vehicle, including these stud bolts 21.

Then, a concrete pavement portion 23 is finished covering the upper surface of the bridge deck base formed by the upper surface of the flange deck slabs 5, 5 and the bridge deck slab 12.

Next, the effect of the viaduct in the above structure will be explained.

In a viaduct with the above structure, if we analyze the moment when a load is applied to the bridge deck after completion, a downward positive moment acts on the bridge deck slab 12 as shown by the dashed line in Fig. 2, Main girder 1,
2, a negative moment acts on the bridge deck 12 and the flange deck 5, 5 as shown by the dashed line in FIG.
The moment is minimum near the joint.

In response to each of these moments, in the viaduct with the above structure, the positive moment acting section has a steel plate structure on the tension side (bottom side) and a concrete structure on the compression side (top side), and the negative moment on the main girder In the action part, the tension side (top side) is made of steel, so it is strong against each moment, and the bridge deck slab 12 and main girders 1 and 2 are joined at the part where the moment is small. It has an ideal structure that requires only a small amount of stress on the joints. Therefore, when designing a viaduct, if the above-mentioned structure is adopted, there is an effect that the strength design of each part has a margin and the design becomes easier. In addition, when designing a viaduct with the above structure,
After thorough model analysis and strength calculations, the bridge deck slab 12 and main girders 1 and 2 are placed in the area where the moment is minimized.
Flange slabs 5, 5 so that the joints of
It is desirable to determine the width of Furthermore, since the moment that acts on the joint between the bridge deck 12 and the main girders 1 and 2 is small, the moment calculation can be simplified and the design centered on shear strength. This has the effect of improving the degree of freedom in designing the joint portion.

By the way, in the case of the viaduct of the above structure, in order to have a structure in which part of the load acting on the bridge deck can be supported by the bridge deck slab 12 and the steel flange deck slabs 5, 5, concrete is installed on the main girder. Compared to the main girder span of a conventional viaduct, which had a deck slab of
The span can be set to a large value. Therefore, the number of main girders can be reduced, which has the effect of reducing the construction cost of the viaduct. Also,
In conventional viaducts using concrete deck slabs, when the main girder span was increased, it was necessary to make the deck thicker, but in the present structure, the strength of the bridge deck 12 is increased. Therefore, even if the main girder span is increased, the deck slab can be made thinner than before, which has the effect of reducing costs.

On the other hand, when replacing the deck slab due to aging, a gate type erection machine is installed and run so as to straddle the flange deck slabs 5, 5 at the top of the main girder. Since the bridge deck slab 12 can be replaced using a machine, the replacement work can be carried out more easily compared to steel deck bridges, which require the entire demolition and construction work. . In addition, bridge deck 12
In replacing the bridge deck 12 as described above, the bridge deck slab 12 can be replaced part by part while gradually moving the gate type construction machine.

"Effects of the Invention" As explained above, the present invention provides the following effects.

Because the bridge deck and steel flange deck are configured to receive the load, the bridge deck has more strength compared to conventional concrete decks, making it possible to set the main girder span larger than before. Become. Therefore, construction costs can be reduced and workability can be improved.

The negative moment (tensile force) that acts on the main girder is countered by a steel flange deck that is strong in tension, and the positive moment that acts on the deck is countered by a concrete bridge deck that is strong in compression. In order to counteract this, and to position the joint between the bridge deck and flange deck in a part with less moment, we created an ideal structure using structural materials with high strength to withstand the various moments that act on the parts. This structure provides leeway in strength calculations and is easy to design.

In addition, when replacing bridge deck slabs, the flange deck slab can be used to run the gate-type construction machine, so the work can be carried out using the gate-type construction machine, making replacement work easier than before. There are effects that can be implemented.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention, with Figure 1 being an exploded perspective view and Figure 2 being an explanatory diagram showing the moment acting on the viaduct. 1, 2... Main girder, 3... Web, 5... Flange deck slab, 6... Floor plate, 12... Bridge deck slab, 2
3... Paving section.

Claims (1)

[Scope of utility model registration request] A steel flange slab is integrated into the upper part of the adjacent steel main girder, extending to the side of the main girder, and between each adjacent flange slab facing each other. A structure of a viaduct, characterized in that a concrete bridge deck slab whose both ends are joined to these flange deck slabs is supported, and a bridge deck base is constituted by the flange deck slabs and the bridge deck.