Method for reinforcing concrete column by expanding section of coated concrete-filled steel tube (CFST)

Abstract

The invention discloses a method for reinforcing a concrete column by expanding section with coated concrete-filled steel tube (CFST), comprising the following steps: (1) preparing for construction; (2) treating the surface of the concrete column; (3) planting steel bars around the concrete column; (4) coating steel tubes outside the concrete column and welding the steel tubes and the concrete column together; (5) welding the planted steel bars and the inner wall of the coated steel tubes together; (6) casting high performance micro-expansion concrete in the gap between the planted steel bars and the coated steel tubes; (7) protecting the outside surface of the steel tubes from corrosion and performing the exterior decoration. The method has a wide application range, thus being applicable to the structural damage caused by the physical ageing of the concrete column and the like, the destroyed structure caused by striking, fire, earthquake, and other disasters, or bad bearing capacity and rigidity of the concrete column caused by story-adding and the like.

Description

technical field [0001] The invention relates to a method for strengthening a concrete column, in particular to a method for strengthening the concrete column by using a steel pipe concrete jacket to effectively improve the bearing capacity and stiffness of the original concrete column, and belongs to the technical field of civil engineering structure reinforcement. Background technique [0002] Due to the rapid development of my country's economy, the functions of many existing buildings have changed, and the actual load has increased. "Strong column weak beam" seismic fortification requirements; In addition, some buildings that have been built or are under construction have some defects due to design or construction reasons; In addition, due to various disasters, the concrete structure is damaged and the bearing capacity is reduced. For these reasons, the reinforcement and repair of reinforced concrete structures have become more and more prominent. Therefore, the research ...

AI Technical Summary

Problems solved by technology

Although the method of enlarging the section improves the stiffness while increasing the bearing capacity and reduces the slenderness ratio of the column, the new and old concrete often have poor co-workability, poor co-deformation performance, and little improvement in structural plasticity; in addition It is difficult to set up formwork construction

The dry-type outsourcing steel is that the outsourcing steel and the original component cannot work as a whole, and they can only bear the force separately, the performance utilization rate of the outsourcing steel is low, and the integrity is poor; the wet-type outsourcing steel method cannot effectively improve the bending stiffness of the column , reduce the slenderness ratio of the column, especially not suitable for the reinforcement of concrete columns with large local surface damage such as impact damage and fire, and which urgently need to greatly increase the stiffness

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