Concrete-filled steel tube column with built-in pre-processed semi-continuous reinforcement cage and its construction method

Abstract

The invention relates to a concrete-filled steel tube column with a built-in preprocessed semi-continuous steel reinforcement cage and a construction method of the concrete-filled steel tube column. The steel tube column comprises a steel cylinder of which the interior is prefabricated with an intermittent steel reinforcement cage and a continuous steel reinforcement cage, wherein the steel cylinder of which the interior is prefabricated with the intermittent steel reinforcement cage is an integral body consisting of the intermittent steel reinforcement cage, a huge steel cylinder and a pulling-tying component; the interior of the huge steel cylinder is divided into a plurality of cavities by virtue of a longitudinal vertical separation plate and a transverse vertical separation plate, transverse separation plates are arranged in each cavity at intervals along the height direction, and the intermittent steel reinforcement cage is positioned between the adjacent transverse separation plates and is connected with the inner wall of the huge steel cylinder to form a whole by virtue of the pulling-tying component; and the continuous steel reinforcement cage is fully arranged along the length of each cavity, and holes for the continuous steel reinforcement cage to penetrate through are formed in the middle parts of the transverse separation plates. By adopting the concrete-filled steel tube column disclosed by the application, the technical problems that a super-long huge concrete-filled steel tube column structure is low in compressive strength and poor in fireproof performance can be solved; and the concrete-filled steel tube column can be widely applied to super-high-rise long-span structures.

Description

technical field [0001] The invention relates to a steel pipe concrete column and a construction method thereof, in particular to a steel pipe concrete column with a built-in preprocessed semi-continuous reinforcement cage and a construction method thereof. Background technique [0002] With the continuous increase in the scale of urban buildings and the requirements of anti-seismic technology, more and more concrete-filled steel tube structures are used. The commonly used concrete-filled steel tube structure is the way of outsourcing steel tubes and pouring concrete inside. However, there are some problems in this structural form, such as concrete shrinkage and The problem of creep, especially for large-scale concrete-filled steel pipes, after the concrete with a large internal volume shrinks, there are micro-cracks with the steel pipes, which may cause the concrete and steel pipes to be unable to bear the force at the same time to achieve the predetermined force effect. [...

AI Technical Summary

Problems solved by technology

[0004] In the specific implementation process of the above structure, there are the following problems: From the perspective of structural force, the above structure has only the transverse restraint stirrups in the core area, and the large area of ​​concrete has no restraint transverse stirrups. Under the action of external load, among them Department first destroys, as in figure 2 As shown in the figure, it can be seen from the figure that under the action of the external load F, the curvature of the middle part of the deformation curve 12 is very large, and there is a convex belly phenomenon

Then why not add lateral constraints to the large-area concrete to increase its compressive strength? The root cause is that the construction of the reinforcement part of the large-section concrete-filled steel tube column needs to enter the steel pipe, and the construction space for workers entering the steel pipe is narrow and the working time is long. Moreover, the construction site is often prone to accidents due to the cross-operation of multiple types of work.

Therefore, imposing transverse restraints on discretely distributed continuous steel bars in existing large-section CFST columns cannot be implemented on site

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