Steel-concrete combined system for improving bearing capacity of concrete box girder bridge

Abstract

The invention discloses a steel-concrete combined system for improving the bearing capacity of a concrete box girder bridge, which comprises steel longitudinal beams, steel cross beams and pier reinforcing mechanisms, and the steel longitudinal beams and the steel cross beams are connected in a crisscross manner; each steel longitudinal beam comprises a main longitudinal beam mounted at the web plate position and a plurality of auxiliary longitudinal beams mounted at the bottom plate position, and the width of the main longitudinal beam is larger than that of the auxiliary longitudinal beams;each steel cross beam comprise a plurality of full-length type cross beams, sectional type cross beams arranged among the full-length type cross beams and supporting type cross beams arranged on the two sides of the original pier; each pier reinforcing mechanism comprises an outer wrapped concrete pier wrapping the outer portion of the original pier and a plurality of supports installed between the outer wrapped concrete pier and the supporting type cross beam. The bearing capacity of the concrete bridge can be greatly improved, the steel consumption is reduced, and construction is convenient.

Description

technical field [0001] The invention belongs to the technical field of bridges, and in particular relates to a steel-concrete composite system for improving the bearing capacity of a concrete box girder bridge. Background technique [0002] Due to its high structural strength and good overall performance, prestressed concrete box girder bridges are usually used in the upper structure of bridges with medium or longer spans. However, prestressed concrete box girder bridges will suffer from a series of diseases affected by the external environment with the growth of the operation period, such as prestress loss, concrete cracking and deterioration caused by the long-term action of overloaded vehicles. With the deepening of the disease, the bearing capacity and stiffness of the box girder structure decreased, and it was in a state of service with disease. Therefore, structural reinforcement of the box girder is required to enhance or restore the bearing capacity of the bridge st...

AI Technical Summary

Problems solved by technology

[0005] 2) Since the stress system of the reinforced structure has not changed, as the main stress structure, the room for improving the bearing capacity of the concrete box girder is very limited. The improvement of the bearing capacity of the original concrete box girder structure does not contribute much. For example, the thickness of the steel plate is too thin, and its own stiffness is small, so it cannot provide more bearing capacity for the concrete box girder bridge; With a complete structural stress system, the components are in an independent stress state, so the contribution to the improvement of the bearing capacity of the original concrete box girder structure is also small. There is no complete stress system formed between them, so the bearing capacity provided to the original concrete bridge is limited;

[0006] 3) Since the reinforced or added components do not form a complete force-bearing system, the existing theoretical calculation methods for the force of bridge structures cannot accurately calculate the increased value of the bearing capacity of the reinforced components

[0007] In fact, the existing conventional reinforcement methods for concrete box girder bridges are only suitable for bridges with good bearing capacity or slightly damaged bridges, not for bridges with more damaged bearing capacity

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