Hoop-bolt mixed joint as well as foundation pit inner support structure and construction method

Abstract

The invention belongs to the technical field of underground foundation pit engineering, and particularly relates to a hoop-bolt mixed joint. The hoop-bolt mixed joint comprises a support component, apositioning hoop, a fastener hoop and a top beam or a waist beam, wherein an embedded part is embedded into the top beam or the waist beam, one side of the positioning hoop is connected with the embedded part, the fastener hoop is arranged above the positioning hoop, and the positioning hoop is connected with the fastener hoop through a mounting bolt; the end part of the support component is clamped between the positioning hoop and the fastener hoop and is connected with the embedded part; and concrete is poured between the top beam or the waist beam and the support component. The invention further provides a foundation pit inner support structure and a construction method. The foundation pit inner support structure comprises an enclosure structure and a support component, wherein connecting joints of the support component and the top beam or the waist beam on both sides of the support component adopt the hoop-bolt mixed joint. According to the hoop-bolt mixed joint as well as the foundation pit inner support structure and the construction method, the positioning hoop is connected with the embedded part, so that the support component is conveniently positioned and installed; and concrete is poured after the support component is connected with the embedded part, so that adjustment and displacement are realized, and the bending resistance, shear bearing capacity and rigidity of the end joint are improved.

Description

technical field [0001] The invention belongs to the technical field of underground foundation pit engineering, and in particular relates to a hoop-bolt mixed joint, a support structure in a foundation pit, and a construction method. 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, the whole p...

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

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