A prestressed steel pipe confined steel concrete column and its preparation method

Abstract

The invention relates to a prestressed steel pipe constrained steel concrete column and a preparation method thereof, comprising steel pipes, shaped steel and concrete, the steel pipe is a prestressed steel pipe; the centroid of the shaped steel coincides with the center of the steel pipe, concrete is poured between the steel pipe and the shaped steel, and The concrete is early-strength concrete, and the inner wall of the steel pipe is sprayed with a mortar layer; the cross section of the steel pipe is circular; the steel pipe is subjected to prestressing treatment by an electrothermal method, and the steel pipe is expanded by heat and contracted by the electrothermal method to obtain a prestress effect; and Transverse ribs are arranged on the inner wall of the steel pipe to enhance the bonding performance between the steel pipe and the mortar layer. Through the present invention, the electric heating method is used to preheat the steel pipe, so that the steel pipe generates prestress, effectively restrains the concrete, improves the rigidity, compressive performance, and fatigue resistance of the column, and at the same time, its simple construction operation effectively overcomes the problems in narrow environments and plateau environments. Unfavorable conditions such as construction in complex environments are difficult.

Description

technical field [0001] The invention relates to a steel-concrete column constrained by prestressed steel pipes and a preparation method thereof, belonging to the application field of civil engineering. Background technique [0002] Prestressing is divided into pre-tensioning and post-tensioning. The pre-tensioning method refers to first stretching the steel bars and then pouring the concrete. The main tensioning procedure is: stretch the steel bars to the control stress on the pedestal according to the design requirements → temporarily fix with anchors → pour the concrete → wait for the concrete to reach more than 75% of the design strength Cut off the loose steel bar, the way of force transmission is to rely on the bonding force between the steel bar and the concrete to prevent the elastic rebound of the steel bar, so that the section concrete can obtain the precompression stress. The post-tensioning method is divided into bonded prestressing and unbonding prestressing. Th...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems in the above-mentioned prior art, and provide a prestressed steel pipe-constrained steel concrete column with high benefit and easy construction and its preparation method, which can significantly improve the crack resistance, mechanical performance and Anti-fatigue performance, etc. At the same time, it solves the problem of inconvenient application of prestress in complex environments such as narrow environments and plateau environments. The electrothermal tensioning equipment is simple, and the tensioning is convenient and flexible, especially for some prefabricated structures where the site is limited or mechanical tensioning is not enough When it is convenient, it can better reflect its superiority

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