Enveloping prestressing force fastening type steel tube concrete column and reinforcement method

Abstract

The invention discloses a fastened steel pipe concrete column confined by pre-stress and a reinforcement method thereof. The column is mainly applied to the reinforcement of a monolayer, multilayer or high-rise frame column which exceeds the limit value of the strength, rigidity or axial compression ratio. The basic principle of the invention is as follows: transverse pre-tensioning of a steel plate which is added to the surface of a rectangular or round reinforced concrete column is built up by screwing down a shear high strength bolt and the resultant force thereof acts on the surface of the reinforced concrete column; in accordance with the principle that acting force equals to counter acting force, the surface of the reinforced concrete column generates a counter acting force (positive pressure) towards the inner wall of the steel plate; in such way, friction force, which is corresponding to the positive pressure and is the so-called shear resistant bearing capacity in a project, is generated between the concrete surface and the inner wall of the steel plate, thereby achieving the loaded effect of the current steel pipe concrete column that is manufactured by casting concrete on the prepared steel pipe. Due to the existence of the transverse pre-stress, the mechanical effect of the steel pipe concrete column in the invention is better than the current one.

Description

technical field [0001] The invention relates to a concrete column structure and a reinforcement method, in particular to an outsourcing prestressed fastening type steel pipe concrete column and a reinforcement method, belonging to the technical field of building structures. Background technique [0002] At present, when making concrete-filled steel pipe columns in high-rise buildings, steel pipes are usually made first, and then concrete is poured into the steel pipes. The problem with this kind of columns is that the concrete will shrink when it is set at high temperature, so that there is a gap between the concrete and the steel pipes, making it difficult to melt. as one. For the addition of floors to existing buildings, in order to increase the strength and rigidity of the columns, it is often necessary to reinforce the columns. At present, it is usually reinforced by wrapping angle steel outside the existing columns and adding panels. This method is difficult to ensure t...

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Problems solved by technology

[0002] At present, when making concrete-filled steel pipe columns in high-rise buildings, steel pipes are usually made first, and then concrete is poured into the steel pipes. The problem with this kind of columns is that the concrete will shrink when it is set at high temperature, so that there is a gap between the concrete and the steel pipes, making it difficult to melt. as one

For the addition of floors to existing buildings, in order to increase the strength and rigidity of the columns, it is often necessary to reinforce the columns. At present, it is usually reinforced by wrapping angle steel outside the existing columns and adding panels. This method is difficult to ensure that the steel plate and the original concrete Transmit shear force to work together, but can only consider the strength and stiffness of the steel frame and the original concrete structure separately. The main reason is that there is no positive pressure between the steel plate surface and the concrete surface, that is, the shear force cannot be transmitted, and there is no basic premise for joint work.

Another method is to pour reinforced concrete directly around the existing concrete column to increase the cross section of the column. If no methods such as planting bars are used, the two cannot be guaranteed to work together. Time-consuming, difficult to construct, and expensive

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