An underpinning method for two-sided or three-sided wrapped reinforced concrete columns

Abstract

The invention discloses a two-side or three-side wrapping type reinforced concrete column underpinning method. A steel plate (5) with a preformed hole is adhered to a spatially limited side of an underpinned reinforced concrete column (1), and reinforced concrete column embracing beams (2) are cast on the other surfaces. The length of the two ends of the steel plate stretching out of the underpinned column is as same as that of each column embracing beam; 2-4 layers of [-shaped horizontal reinforcing steel bars (3) are welded on the steel plate (5) along the height direction; the other un-welding end of the reinforcing steel bar (3) is anchored in the column embracing beam (2) which is connected to the reinforcing steel bar (3). A preformed hole is also formed in the steel plate (5) relative to the column embracing beams and corresponds to the preformed hole in the steel plate (5); a bolt (4) is used for pulling oppositely so as to apply a pre-pressure and increase integrality of column embracing nodes; a screwing nut anchorage device (7) is used for applying a pre-stress to a bolt beam end. As adhesive steel and the column embracing beams compose asymmetrical underpinning nodes, and a pre-stressed tendon is stretched and drawn to improve the integrity of the underpinning nodes and the underpinning bearing capacity, the two-side or three-side wrapping type reinforced concrete column underpinning method avoids limitation of a construction site efficiently, is high in underpinning reliability and convenient in construction.

Description

technical field [0001] The patent of the invention relates to an underpinning method of a reinforced concrete column and an underpinning node structure, and belongs to the discipline field of engineering structure reinforcement and transformation and application of prestressing technology. Background technique [0002] Reinforced concrete structure is one of the most widely used structural forms at home and abroad. Due to design and construction defects, various physical, chemical and biological damages in nature, or increased use requirements, a large number of engineering structures need to be reinforced and transformed. Structural underpinning technology is to achieve structural safety underpinning by changing the load transmission path. This technology is widely used in the fields of building jacking correction engineering, building large space renovation engineering, and building overall displacement engineering. The most common engineering underpinnings include column ...

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Problems solved by technology

[0003] In recent years, with the increasing number of reconstruction projects for the improvement of seismic performance and function of existing buildings, underpinning technology has become more and more widely used. The distance is only about 10cm, and the underpinning methods such as conventional column holding and planting bars for reinforced concrete columns do not meet the construction conditions

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