Foundation pit supporting system and construction method thereof

Abstract

The invention provides a foundation pit supporting system and a construction method thereof. The foundation pit supporting system comprises a top rack, wherein the top rack is connected to a telescopic part I, the telescopic part I is arranged on the ground, the top rack is connected to a bottom rack, and a protecting plate is arranged outside the bottom rack. The construction method comprises thefollowing steps of leveling a site; mounting the telescopic part I, the top rack and the bottom rack; excavating earth, transferring the bottom rack down, and carrying out protecting plate supporting; paving a lining structure and lifting the bottom rack; lifting the bottom rack continuously for earthing and backfilling; removing the supporting system; carrying out backfilling and earthing to restore the ground surface. The foundation pit supporting system has the advantages that it is not needed to construct a temporary structure such as a fender post and an anchor cable, so that construction waste is reduced and pollution to a stratum is reduced; use of concrete is reduced; excavation and supporting are carried out synchronously, and a statically indeterminate steel structure system sinks simultaneously with an excavated interface, so that it is convenient to construct and safe and reliable; a recoverable steel structure system is used, the amortization expense can be lowered by large area popularization, the project investment is reduced, and the foundation pit supporting system has a good economical benefit.

Description

technical field [0001] The invention relates to the field of underground engineering, in particular to a foundation pit support system and a construction method thereof. Background technique [0002] In order to ensure the safety of the foundation pit, the support structure of the foundation pit is mainly divided into enclosure structure + internal support system, enclosure structure + anchor cable, slope setting + soil nail support and other forms. Slope + soil nailing is suitable for engineering projects with relatively open sites. For urban municipal projects, due to the relatively small site, two forms of enclosure structure + internal support system, enclosure structure + anchor cable are often used. Most of the enclosure structures are temporary structures. After the project is completed, the enclosure piles and anchor cables will remain permanently in the soil and become construction waste, resulting in a waste of resources. Especially if the anchor cables remain in t...

AI Technical Summary

Problems solved by technology

[0006] The invention proposes a foundation pit support system and its construction method, which solves the existing problems of environmental protection, safety, economy, and work efficiency, reduces the use of enclosure piles, reduces construction waste and the impact on the environment, and reduces the traditional There are safety risks in the enclosure structure (such as pile + inner support system, pile + anchor cable). Using this support system on a large scale can reduce the amortization cost. Finally, the steel structure can be recycled to optimize resource allocation.

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