Lower flange improved corrugated steel web plate composite box girder and construction method thereof

Abstract

The invention discloses a lower flange improved corrugated steel web plate composite box girder and a construction method thereof, which belong to the technical field of bridge structures. The box girder consists of an upper flange concrete slab, a corrugated steel web plate, a lower flange concrete slab, an upper flange steel plate, a lower flange steel plate and male pin connecting pieces, wherein a steel bar mesh piece and a prestressed tendon corrugated pipe are arranged in the lower flange concrete slab. The lower flange concrete slab is connected with the lower flange steel plate and the corrugated steel web plate to form a whole body through the male pin connecting pieces which are welded above the lower flange steel plate and on the lateral surface of the corrugated steel web plate. By adopting the structure, the lower flange improved corrugated steel web plate composite box girder can solve the problems that the on-site amount of work and the construction difficulty are large for casting the lower flange concrete slab of the conventional corrugated steel web plate composite box girder, the construction quality is difficult to guarantee and the like under the premise of almost not increasing the steel consumption, gives full play to the tensile property of the steel plates and the restriction to concrete, enhances the bearing capacity and the cracking resistance of the structure, and improves the durability of the structure. The lower flange improved corrugated steel web plate composite box girder is simple in structure, reasonable in stressing and quick and convenient in construction, and has good technical and economic benefits.

Description

technical field [0001] The invention relates to a lower flange improved corrugated steel web composite box girder applicable to highway bridges and railway bridges, belonging to the technical field of bridge structures. Background technique [0002] Traditional corrugated steel web composite box girder, such as figure 1 As shown, it consists of the upper flange concrete slab (1), the lower flange concrete slab (2) and two corrugated steel webs (3), the corrugated steel webs of each leg and the upper flange steel plate (4) and the lower The flange steel plate (6) is transported to the construction site for installation and positioning after being welded in the factory. When the lower flange concrete slab is poured, a full house scaffolding needs to be set up on site to support the formwork. There are problems such as on-site operation and construction difficulty. At the same time, the joint of the lower flange concrete slab and the lower flange steel plate is limited due to ...

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Problems solved by technology

When the lower flange concrete slab is poured, a full house scaffolding needs to be set up on site to support the formwork. There are problems such as on-site operation and construction difficulty. At the same time, the joint of the lower flange concrete slab and the lower flange steel plate is limited due to the narrow pouring space. Difficult to guarantee, affecting the mechanical performance of the joint

On the other hand, the concrete slab of the lower flange is suspended under the corrugated steel web through the stud connector (5). There is a hidden danger of relative separation under the action of its own weight, and it is easy to crack prematurely under the action of positive bending moment, thereby reducing the structural strength. Bearing capacity and stiffness affect the durability of the structure

These problems have caused certain difficulties to the popularization and application of this type of structure.

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