A foundation pit support system and its construction method

Abstract

The present invention proposes a foundation pit support system and a construction method thereof. The support system includes a top frame, the top frame is connected with an expansion part I, the expansion part I is arranged on the ground, the top frame is connected with the bottom frame, and the outside of the bottom frame With guard plate. The construction method includes the following steps: leveling the site; installing the expansion part I, the top frame and the bottom frame; excavating the earth, lowering the bottom frame, and supporting the guard plate; laying the lining structure, lifting the bottom frame; continuing to lift, and backfilling with soil; Remove the supporting system; backfill the covering soil and restore the surface. The present invention has the following advantages: no need to construct temporary structures such as enclosure piles and anchor cables, reducing construction waste and pollution to the stratum; reducing the use of concrete; excavation and support are carried out simultaneously, and the ultra-statically indeterminate steel structure system follows the excavation The excavation interface sinks at the same time, the construction is convenient, safe and reliable; the use of recyclable steel structure system, large-scale promotion can reduce amortization costs, reduce project investment, and have good economic benefits.

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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