Hollow concrete-filled steel pipe support, prefabricated part, construction method, and supporting system

Abstract

The invention belongs to the technical field of foundation pit engineering, and particularly relates to a hollow concrete-filled steel pipe supporting prefabricated part and a construction method thereof. The hollow concrete-filled steel pipe supporting prefabricated part comprises a steel pipe and a connector steel plate, the steel pipe is filled with concrete, and a hollow part penetrating in the axial direction is arranged in the concrete; a steel reinforcement framework is arranged in the concrete; annular joint steel plates are welded to the two ends of the steel pipe; and the inner sidesof the joint steel plates are connected with the steel reinforcement framework, and the outer sides of the joint steel plates are located outside the steel pipe. The invention further provides a hollow concrete-filled steel pipe support and a supporting system. The hollow concrete-filled steel pipe support is formed by connecting and assembling a plurality of the hollow concrete-filled steel pipesupport prefabricated parts through bolts. The supporting system comprises an enclosure structure, a top beam, a waist beam, and the hollow concrete-filled steel pipe support. The hollow steel pipe concrete supports are supported between the two opposite sides of the top beam and between the two opposite sides of the waist beam. The bearing capacity, the deformation resistance, the integrity, andthe middle joint strength of the hollow steel pipe concrete support can be improved.

Description

technical field [0001] The invention belongs to the technical field of underground foundation pit engineering, and in particular relates to a hollow steel tube concrete support, a prefabricated part, a construction method and a support system. Background technique [0002] Traditional cast-in-place concrete supports are widely used in underground projects due to their advantages of high rigidity, good integrity, safety and reliability, but there are also prominent problems and shortcomings: (1) Expensive and high investment: concrete supports are temporary projects, The main body of the station structure is completed, that is, the external transport is broken, and the investment in temporary abandoned projects is high. Generally, underground stations amount to millions, and complex stations amount to tens of millions; (2) Time-consuming and long construction period: concrete support formwork, binding steel bars, pouring vibration Pounding, maintenance, and later demolition, ...

AI Technical Summary

Problems solved by technology

[0002] Traditional cast-in-place concrete supports are widely used in underground projects due to their advantages of high rigidity, good integrity, safety and reliability, but there are also prominent problems and shortcomings: (1) Expensive and high investment: concrete supports are temporary projects, The main body of the station structure is completed, that is, the external transport is broken, and the investment in temporary abandoned projects is high. Generally, underground stations amount to millions, and complex stations amount to tens of millions; (2) Time-consuming and long construction period: concrete support formwork, binding steel bars, pouring vibration Pounding, maintenance, and later demolition, the whole process lasts for several months, which seriously restricts the progress of on-site construction; (3) Laborious and difficult: the concrete support construction is difficult, and the demolition construction after use will consume a lot of manpower and material resources; (4) ) is not environmentally friendly, and concrete destroys waste residues to pollute the environment, which is not in line with the development direction of green construction, environmental protection and energy saving

[0003] Although the traditional steel pipe support can be recycled and the construction is more convenient, it can only bear the pressure between it and the retaining structure of the foundation pit, the integrity is poor, and the deformation resistance is poor, which has become a weak link in the safety of the foundation pit

[0004] In the prefabricated supports currently seen, the weak links are mostly at the connecting nodes, and rigid connections cannot be realized at the nodes, resulting in insufficient overall stability of the foundation pit

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