A Method for Retrofitting and Strengthening Prestressed Reinforced Concrete Beams

Abstract

A prestressed reinforced concrete beam reconstruction and strengthening method, the main beam in the vertical direction is supported by jacks and steel pipe columns; the floor is supported by steel pipes; the concrete surface strain gauge and laser rangefinder are erected; the steel pipe column is lifted by jacking up ; heighten the column head of the original reinforced concrete frame column; add new beams on the top of the prestressed beam; cut off the prestressed tendons or prestressed steel strands in the prestressed beam one by one; remove and reduce the concrete at the bottom of the prestressed beam ; Restoring the stressed reinforcement on the new bottom of the prestressed beam; repairing the new bottom; strengthening the prestressed beam to restore its mechanical performance; This method can solve the problems of small overall storey height and unsatisfactory headroom due to the high section of the prestressed beam, and can ensure that the prestressed beam after height reduction can have good bearing capacity and stable service life, satisfying the overall Requirements for storey height use function and building safety level.

Description

technical field [0001] The invention belongs to the technical field of building reinforcement, and in particular relates to a reconstruction and reinforcement method for prestressed reinforced concrete beams. Background technique [0002] With the rapid development of the construction industry, in large-space public buildings, prestressed concrete frame structures are favored for their advantages of light weight, large spanning capacity, and good durability, but at the same time, the requirements for building safety levels are also increasing. . On the one hand, in a large number of infrastructure construction, the problem of poor design inevitably occurs. For example, the section height of the prestressed beam of the prestressed concrete frame structure built in the early stage is relatively large, which causes the building height to be affected to a certain extent. With the change of the building's use function, a larger storey height may be required; on the other hand, b...

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Problems solved by technology

[0006] Aiming at some problems existing in the prior art, the present invention provides a method for rebuilding and strengthening prestressed reinforced concrete beams. The reinforcement method has short construction period, quick results and simple construction technology, and can solve problems caused by the high section of prestressed reinforced concrete beams. The overall floor height is small and the headroom does not meet the requirements of use, and it can ensure that the prestressed beam after height reduction can have good bearing capacity and stable service life, meeting the requirements of the overall floor height use function and building safety level

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