Construction method of foundation pit support

Abstract

The invention discloses a construction method of a foundation pit support, which is characterized in that each side of a foundation pit adopts a steel sheet pile and one steel support supporting structure scheme, and the foundation pit is constructed by adopting a secondary well point dewatering and tube well dewatering combined with an open trench drainage method. The main construction sequence of the supporting structure is grooving, steel sheet pile construction, well point or tube well arrangement, well point dewatering, purlin and support construction, earthwork excavation, construction of a bottom plate, side walls, a top plate and the like, soil backfilling, support dismantling, steel sheet pile pulling and removing and grouting. According to the foundation pit supporting structure, Larsen IV new steel sheet piles are adopted, the pile length is 15 m, supports and enclosing purlins are both made of H400 * 400 * 13 * 21 profile steel, and all the steel enclosing purlins need to be connected into a whole. The steel supports are connected with the steel enclosing purlins in a welded mode, reliable steel brackets are arranged on the lower portions of the steel enclosing purlins, and gaps are formed by filling and pouring C20 concrete.

Description

Technical field [0001] The present invention belongs to the field of building construction, and is specifically related to a construction method of foundation pit support. Background technique [0002] At present, in an ultra-deep foundation pit support, the underground continuous wall is generally set, and then the support structure in the foundation pit is set, and the internal support structure set by the support method will occupy the internal space of the foundation pit. After the construction, sometimes the settings need to be removed first, extend the construction cycle, and is not conducive to the deep base pit operation of small substrate area. Inventive content [0003] Apparatus: In order to solve the deficiencies of the prior art, the present invention provides a construction method of a foundation pit support. [0004] Technical Solution: Construction method of foundation pit support, steel sheet pile + steel support support structure plan, foundation pit support st...

AI Technical Summary

Problems solved by technology

[0002] At present, in the support of ultra-deep foundation pits, the underground diaphragm wall is generally installed first, and then the internal support structure is set inside the foundation pit for support. The internal support structure set by this support method will occupy the internal space of the foundation pit and affect the In the later stage of construction, sometimes the installation needs to be dismantled before construction, which prolongs the construction period and is not conducive to the operation of deep foundation pits with small base areas

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