A kind of external prestressed reinforcement structure of cover beam and its construction method

Abstract

Disclosed is a cover beam external prestressing reinforcing structure. Steel cable steering blocks are fixed to the upper portion of the side face of a cover beam and the lower middle portion of a cover beam midspan. A steel cable steering support is fixedly installed on the bottom face of the cover beam midspan. The two ends of an external prestressing steel cable are connected with tension anchorage devices respectively through the steel cable steering blocks and the steel cable steering support. The tension anchorage devices are fixed into concrete gear blocks for tensioning. The construction method comprises the steps of manufacturing the steel cable steering blocks, manufacturing and installing the steel cable steering support, installing the steel cable steering blocks, manufacturing the concrete gear blocks for tensioning, installing the external prestressing steel cable for tensioning and anchoring, and conducting preservative treatment on a cover beam bottom steel plate and cover beam side steel plates. According to the external prestressing reinforcing structure, two-time loading can be performed on the cover beam midspan just by performing tensioning and anchoring one time on the prestressing steel cable, so that the midspan bending resistance reinforcing effect is improved obviously. The horizontal included angle of the external prestressing steel cable is increased through the steel cable steering support, and the reinforcing effect is effectively improved.

Description

technical field [0001] The invention relates to a highway bridge, in particular to an external prestressed reinforcement structure for a cover beam and a construction method thereof. Background technique [0002] When the flexural bearing capacity of the cover beam is insufficient, methods such as increasing the section of the cover beam, pasting steel plates or carbon fiber cloth, or applying internal or external prestress are commonly used for reinforcement. [0003] External prestressed reinforcement has the advantages of fast construction and uninterrupted traffic, but the reinforcement effect has a lot to do with the form of external prestressed cables. [0004] The conventional form of external prestressed reinforcement is that the cables are routed to the cantilever end of the cover beam after the cables are laid at the middle and lower edge of the cover beam for anchoring. This type of cloth cable is limited by the height of the cover beam, and the horizontal angle ...

AI Technical Summary

Problems solved by technology

This type of cloth cable is limited by the height of the cover beam. The horizontal angle between the externally prestressed steel beams in the span of the cover beam is small, and the vertical component force that can be provided is also small, so the reinforcement effect is not ideal.

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