Prefabricated hollow interlayer concrete-filled steel tube member and preparation method thereof

Abstract

The invention discloses a prefabricated hollow interlayer concrete-filled steel tube member and a preparation method thereof. The prefabricated hollow interlayer concrete-filled steel tube member comprises an inner steel tube and an outer steel tube which are concentrically arranged, concrete is poured between the inner steel tube and the outer steel tube, a plurality of angle steel ribbed stiffeners which are evenly distributed around the axis on the external wall of the inner steel tube, the angle steel ribbed stiffeners are surrounded by a reinforcing mesh which is arranged in concentricitywith the inner steel tube, a sleeve which is not connected to the ends of the outer steel tube and beam-column joints is arranged along the length of the surface on the outside of the outer steel tube, and a prestressed ferrule is arranged at the end of the sleeve. According to the invention, because the bending rigidity of the prefabricated hollow interlayer concrete-filled steel tube member ishigh under the condition of the same weight after the section is spread, under the condition of high bending moment, the mechanical properties of the material can be better exerted, the bearing capability is high, the prefabricated hollow interlayer concrete-filled steel tube member has good plasticity, toughness and fire resistance, the speed of construction can be increased, the period of construction can be shortened, and economic benefit can be increasedimproved.

Description

technical field [0001] The invention relates to the technical field of building structural components, in particular to an assembled hollow interlayer concrete-filled steel tube component and a preparation method thereof. Background technique [0002] Due to the restraint of the outer steel tube on the sandwich concrete and the support effect of the inner steel tube on the sandwich concrete, the hollow sandwich concrete filled steel tube shows better mechanical properties than the reinforced concrete structure, and can be used in industrial and civil buildings, bridges, towers and other structures middle. [0003] However, in the long-term use practice, we found that it still has the following problems: [0004] 1. The traditional steel tube concrete is self-heavy, resulting in poor seismic performance and high foundation cost. Under the action of axial load, the inner and outer steel tubes and the core concrete bear the longitudinal load at the same time, and the restraint...

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Problems solved by technology

[0004] 1. The traditional concrete-filled steel tube is heavy, resulting in poor seismic performance and high foundation cost. Under the action of axial load, the inner and outer steel tubes and the core concrete bear the longitudinal load at the same time, and the restraining effect of the steel tube on the core concrete cannot be fully exerted. The core concrete is prone to shear crush failure during the stress process

[0005] 2. Ordinary hollow sandwich concrete-filled steel tube members, when the inner steel tube bears the vertical axial compression load, it will also be subjected to the hoop tension generated by the expansion of the core concrete on the inner steel tube. Due to the hoop capacity of the outer steel tube and the inner rigidity The bearing capacity of the tube is poor. At this time, the inner steel tube will buckle locally under the action of double force, which will cause the inner steel tube and the core concrete to be separated, and the constraint on the core concrete will be weakened.

The hoop ability of the outer steel pipe of ordinary hollow sandwich concrete-filled steel tube members is weak. In actual engineering, due to the core concrete pouring and curing methods, or the core concrete is affected by factors such as shrinkage, creep and temperature, the inner steel pipe and the void between core concrete

[0006] 3. In actual use, steel pipes are prone to rust due to their poor corrosion resistance, which affects the durability and mechanical properties of components and limits the use of such components

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