Steel-encased-ultra-high-performance concrete reinforcing method for box girder

Abstract

The invention discloses a steel-encased-ultra-high performance concrete reinforcing method for a box girder. The method comprises the following steps of setting out the positions of bolts and embedded steel bars on the box girder, and drilling at the position of the box girder; mounting and maintaining the embedded steel bars, and embedding steel bar hooks along the longitudinal direction of the bridge; bottom plate stirrups and web stirrups being installed and bound with the embedded steel bars; the positions of the studs being lofted, and the studs being welded to the bottom steel plate and the side steel plates; the bottom steel plate and the side steel plates being fixed to the box girder through bolts, and the bottom steel plate and the side steel plates being welded through fillet welds; and ultra-high performance concrete being poured and cured. The method steel-encased ultra-high performance concrete of the box girder is reinforced, the steel plate-ultra-high performance concrete can effectively improve section rigidity of the original structure, the bearing capacity of the structure is greatly improved, the size of the reinforced section of the structure is small, and reinforcing efficiency is high. According to the steel-ultra-high performance concrete reinforcing design, common load-bearing steel bars and prestressed steel strands are not configured, and the site construction process is simple.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a method for reinforcing a box girder with outer steel-ultra-high performance concrete. Background technique [0002] There are a large number of prefabricated small box girder bridges in my country. After many years of operation, the bridges built in the early stage often have transverse cracks in the bottom plate, vertical cracks in the web, and longitudinal cracks in the web, which seriously affect the bearing capacity and durability of the bridge. The commonly used reinforcement methods for the bridge superstructure include external prestress reinforcement and outsourcing concrete reinforcement. Both of the above two reinforcement methods use external prestress. The prestressed tendons are exposed to the air, and there is a risk of corrosion; while the traditional outsourcing concrete reinforcement has a large cross-sectional size, and increases the sel...

AI Technical Summary

Problems solved by technology

The commonly used reinforcement methods for the bridge superstructure include external prestress reinforcement and outsourcing concrete reinforcement. Both of the above two reinforcement methods use external prestress. The prestressed tendons are exposed to the air, and there is a risk of corrosion; while the traditional outsourcing concrete reinforcement has a large cross-section size, and increases the weight of the structure, resulting in low reinforcement efficiency

To sum up, using the traditional bridge reinforcement method, the efficiency of bridge reinforcement is low, and the operation after reinforcement cannot be economical and durable.

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