Self-stress adjustable concrete filled steel tubular column

Abstract

The invention discloses a self-stress adjustable concrete filled steel tubular column. The self-stress adjustable concrete filled steel tubular column comprises a steel tube, wherein the upper part of the steel tube is provided with symmetric longitudinal groove seams, a core concrete column is arranged in the steel tube, a plurality of transverse strengthening ribs which tightly hold the steel tube are arranged on the outer surface of the steel tube, two adjacent ribs are connected by virtue of a bolt and a nut, each longitudinal groove seam of the steel tube is sealed by virtue of a filling strip made of a high-elasticity polymer, and cylindrical surfaces, divided by the groove seams, of the upper part of the steel tube shrink inwards when two adjacent ribs are screwed by the bolts so as to eliminate a pumping area. Due to the adoption of the self-stress adjustable concrete filled steel tubular column, with the arrangement of an adjustable self-stress steel barrel, the structure is simple, the manufacturing is convenient, and the cost is low; by virtue of the tightening of the adjacent ribs on the steel barrel, the symmetric cylindrical surfaces of the steel barrel can be incurved and deform, so that the pumping area can be completely eliminated, and the core concrete is compressed to form the self stress.

Description

technical field [0001] The invention relates to a composite structure of steel tube concrete in civil engineering and bridge engineering. Background technique [0002] Concrete filled steel pipe is a composite structure formed by pouring concrete into thin-walled steel pipes. Compared with the traditional reinforced concrete structure, it has many advantages such as high bearing capacity, light weight, good plastic toughness, convenient construction and saving cement and formwork materials. In recent years, this new type of structure has been paid more and more attention, and has been widely used in high-rise building projects, subway station projects and long-span bridge projects at home and abroad. [0003] In the steel tube concrete structure, the two materials of steel tube and concrete interact in the process of stress, that is, the confinement of the steel tube to the concrete makes the concrete in a three-dimensional compressive stress state, so that the strength of ...

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Problems solved by technology

[0005] Aiming at the common problem of hollowing out of steel pipes and core concrete columns in the construction and use of existing steel pipe concrete columns, a mechanical method of shrinking the steel pipes is provided to erase the void area and generate self-stress between the steel pipes and concrete

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