Soft soil area basement layer adding construction method

Abstract

The invention discloses a soft soil area basement layer adding construction method. The method includes the following steps that firstly, a newly-added supporting and protecting wall is constructed on the inner side of an original finished supporting and protecting wall in a soft soil area basement; secondly, earth excavating and support erecting are conducted, and a reinforced concrete surrounding purlin is arranged at the elevation position of the top of the newly-added supporting and protecting wall; thirdly, downward excavating is conducted continuously until a pit bottom is reached, and local over-excavation is conducted on the adjacent corner positions of the layer adding pit bottom and the newly-added supporting and protecting wall; fourthly, a structural base board is poured, and the local over-excavation position is provided with an inverted bracket structure; fifthly, the part, located between the reinforced concrete surrounding purlin and the structural base board, of the newly-added supporting and protecting wall is removed in a chiseling mode; sixthly, supporting frames are detached layer by layer and floors are poured layer by layer until a structural roof is completed. According to the soft soil area basement layer adding construction method, on the premise that the overall safety and reliability of the basement are not affected, the part, occupying the area of the layer adding basement, of the newly-added supporting and protecting wall is removed in the chiseling mode, and the occupation on the building area of the basement by the newly-added supporting and protecting wall in the back constructing stage is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of underground engineering construction, in particular to a construction method for adding layers to basements in soft soil areas. Background technique [0002] In the construction of basements in soft soil areas, due to the adjustment of the overall underground space planning of the region and the expansion of basement functions, the length or strength of the supporting walls of the foundation pits that have been implemented cannot meet the requirements for deepening the excavation depth of the foundation pits. Adding a row of retaining walls on the inner side of the retaining wall to form a composite support system can solve the safety problem in the excavation of the foundation pit, but how to safely and reliably eliminate the "influence of the newly added retaining walls on the construction area of ​​the basement in the restoration stage" The impact of encroachment is an unresolved technical problem. ...

AI Technical Summary

Problems solved by technology

[0002] In the construction of basements in soft soil areas, due to the adjustment of the overall underground space planning of the region and the expansion of basement functions, the length or strength of the supporting walls of the foundation pits that have been implemented cannot meet the requirements for deepening the excavation depth of the foundation pits. Adding a row of retaining walls on the inner side of the retaining wall to form a composite support system can solve the safety problem in the excavation of the foundation pit, but how to safely and reliably eliminate the "influence of the newly added retaining walls on the construction area of ​​the basement in the restoration stage" The impact of encroachment is an unresolved technical problem

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