Soft soil foundation pit construction method by using dynamic compaction block stone displacement instead of supporting

Abstract

The invention relates to the field of soft soil foundation pit construction and discloses a soft soil foundation pit construction method by using dynamic compaction block stone displacement instead of supporting. The soft soil foundation pit construction method comprises the following construction steps that (1), the displacement range needing dynamic compaction block stone displacement is determined; (2), the first-pass construction of dynamic compaction block stone sludge extruding is carried out in the determined displacement range; (3), the second-pass or multiple-pass construction of dynamic compaction block stone sludge extruding is carried out in the determined displacement range till sludge and soft soil in the displacement range are all displaced by the dynamic compaction block stone; and (4), a foundation pit is excavated in a stratified mode up to the bottom of the pit in the area subjected to dynamic compaction block stone displacement. The construction method has the advantages that the pollution of the environment is avoided; plenty of materials such as steel materials, cement and concrete do not need to be planted in a soil body, plenty of manual materials are saved, and therefore the engineering cost is low; time of waiting for strength increasing is avoided; and stratified and continuous excavating can be conducted, so that the construction steps are simple and the construction period is short.

Description

technical field [0001] The invention relates to the field of soft soil foundation pit construction, in particular to a soft soil foundation pit construction method in which dynamic tamping stones are replaced for support. Background technique [0002] At present, in the silt soft soil area with a depth of less than 8m, it is necessary to excavate a foundation pit with a depth of less than 8m. At present, the foundation pit support structures commonly used in silt and soft soil areas mainly include: [0003] 1) Cement-soil gravity retaining wall support structure formed by multiple rows of cement mixing piles; [0004] 2), continuous steel sheet pile support structure; [0005] 3) Composite soil nail wall support structure; [0006] 4) Concrete pouring pile + anchor cable (or internal support) support structure. [0007] In the prior art, when excavating foundation pits in silt soft soil areas, no matter which method is used for special foundation pit support, the followi...

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Problems solved by technology

[0012] The purpose of the present invention is to provide a soft soil foundation pit construction method that replaces support with dynamic tamping blocks, and aims to solve the problem of excavating foundation pits in silt soft soil areas in the prior art, using conventional foundation pit support methods, There are problems of material waste, high construction cost, environmental pollution and long construction period

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