Prestressed reinforced concrete beam transforming and reinforcing method

Abstract

The invention discloses a prestressed reinforced concrete beam transforming and reinforcing method. A main beam in the vertical direction is supported through jacks and steel pipe columns; floor slabs are supported through steel pipe; concrete surface strain gauges and laser range finders are erected; the steel pipe columns are upwards loaded and jacked through the jacks; the column heads of original reinforced concrete frame columns are heightened; newly-added beams are additionally arranged on the tops of prestressed beams; prestressed steel bars or prestressed steel strands in the prestressed beams are cut off one by one; concrete at the bottom of the prestressed beams are removed and reduced; new bottom surface prestressed steel bars of the prestressed beams are recovered; a new bottom surface is repaired; the prestressed beams are reinforced, so that the stress performance of the prestressed beams is recovered; and the jacks are unloaded, the steel pipe columns and the steel pipes are removed. According to the method, the problems that the overall floor height is small and the clearance does not meet the use requirement due to the fact that the sections of the prestressed beams are high can be solved, it can be ensured that the prestressed beams with the reduced height can have good bearing capacity and stable service life, and the requirements for the overall floor height use function and the building safety level are met.

Description

technical field [0001] The invention belongs to the technical field of building reinforcement, and in particular relates to a method for rebuilding and strengthening 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 due to their 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 constructions, problems of poor design inevitably arise, such as the prestressed concrete frame structure prestressed beams built in the early stage have a large cross-sectional height, which affects the building floor height to a certain extent. With the change of the building's use function, a larger floor height may be required; on the other hand, due to the needs of the owner, the building m...

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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 the height reduction can have a good bearing capacity and a stable service life, meeting the requirements of the overall floor height use function and building safety level

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