Prefabricated inner support edge node structure of foundation pit and construction method

Abstract

The invention belongs to the technical field of underground foundation pit engineering, and particularly relates to a prefabricated inner support edge node structure of a foundation pit and a construction method. The prefabricated inner support edge node structure comprises a prefabricated support and a top beam or a waist beam, wherein a first telescopic joint is fixed to the end of the prefabricated support, and a second telescopic joint is fixed to the inner side of the top beam or the waist beam; the first telescopic joint and the second telescopic joint are of the same structure and eachcomprise a solid steel plate, a U-shaped hole steel plate, a U-shaped steel plate and a stiffening plate; one end of the U-shaped steel plate penetrates through a U-shaped hole in the U-shaped hole steel plate and is welded to the solid steel plate, and multiple lines of long circular holes are formed in two side walls of the other end of the U-shaped steel plate; the solid steel plate is connected with the U-shaped hole steel plate through the stiffening plate; and the U-shaped steel plate of the first telescopic joint is clamped in the U-shaped steel plate of the second telescopic joint, andthe long circular hole in the first telescopic joint is connected with the long circular hole in the second telescopic joint through a bolt. According to the prefabricated inner support edge node structure, the requirements of rigid connection and equal-strength connection of side nodes can be met, the engineering safety is guaranteed, additionally, the length of the joints can be adjusted, and the construction error can be adjusted.

Description

technical field [0001] The invention belongs to the technical field of underground foundation pit engineering, and in particular relates to a support edge node structure and a construction method in an assembled foundation pit. 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 proces...

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] In the prefabricated support currently seen, most of the weak links are at the connection structure, and the joints cannot be rigidly connected, resulting in insufficient overall stability of the foundation pit; and the prefabricated support sections in the factory are of standard length, and there are always errors in the construction process

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