Shear strengthening methods and devices for hollow slab beams

By setting recessed areas and through holes on the hollow slab beams and using upper and lower connectors and tie rods to connect them, the lateral connection of the slab beams is enhanced, solving the problem of insufficient shear resistance at the beam ends of the hollow slab beams, thereby improving shear resistance and protecting the structure.

CN113789732BActive Publication Date: 2026-05-26SHANGHAI PUDONG NEW DISTRICT ROAD CONSTR DEV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI PUDONG NEW DISTRICT ROAD CONSTR DEV
Filing Date
2021-07-29
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

The existing hollow slab beams have insufficient shear resistance at the beam ends, especially in large-span prestressed hollow slab beams, which leads to oblique shear cracks in the web, affecting structural safety, and existing reinforcement methods damage the original structure.

Method used

By creating recessed areas on the bridge and through holes in the hinge joints of the hollow slab beams, fixing the upper and lower connectors and connecting them with tie rods, the lateral connection between the slab beams is enhanced, the stress state of a single beam is weakened, and cracks are prevented.

Benefits of technology

By strengthening the lateral connection between the slab beams, the shear resistance of the hollow slab beams was improved, preventing further crack propagation and cracking of the repair adhesive, thus protecting the integrity of the original structure.

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Abstract

This invention provides a method and device for shear reinforcement of hollow slab beams. The method includes: creating a recessed area at the upper end of the bridge; creating at least one through hole in the hinge joint of the hollow slab beam, the through hole communicating with the recessed area; fixing an upper connector at the recessed area and a lower connector at the lower end of the bridge; installing a tie rod in the through hole, the two ends of the tie rod being fixedly connected to the upper connector and the lower connector respectively; and repairing the recessed area. In this invention, the upper connector, lower connector, and tie rod constitute a reinforcement assembly, which enhances the lateral connection between the slab beams, weakens the stress state of a single beam, avoids beam-slab vibration, and thus prevents cracking and dispersion of the crack repair adhesive.
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