Construction method of foundation pit supporting and earth excavation of building basement

Abstract

The invention relates to a construction method of foundation pit supporting and earth excavation of a building basement. The construction method comprises the following steps that S1, a site is leveled, side setting-out of an edge line is conducted, the axis is constructed, and the pile position of a stirring pile is determined; S2, the stirring pile is constructed; S3, a prestressed pipe pile isconstructed; S4, a foundation pit top drainage system is constructed; S5, earth is excavated; and S6, a foundation pit bottom drainage system is arranged. A building is arranged under underground water, and therefore water stopping or drainage devices such as a water stopping curtain and a water collection well are arranged on the peripheral side of a foundation pit. As for blocking of surface water, the main steps are that a water blocking concrete foundation is arranged on the top of a side slope; the top of the slope is slightly high, so that the surface water is drained into a drainage ditch outside the foundation pit; and meanwhile the ground on the top of the slope is subjected to hardening treatment, so that the surface water and rainwater are prevented from permeating into a protecting wall of the side slope. The drainage ditch and the water collection well are arranged in the foundation pit along the periphery of the foundation pit according to the design requirement, water inthe foundation pit is drained timely, and the situation that the surface water or the underground water affects the structural strength of the foundation pit is avoided.

Description

Technical field [0001] The invention relates to a building construction method, in particular to a construction method for foundation pit support and earth excavation of a building basement. Background technique [0002] With the popularity of large-scale engineering projects with basements, special construction schemes for foundation pit support and earth excavation play an important role in large-scale engineering projects with basements. [0003] For example, the underground floor of an engineering project is 6,628 square meters, and there are 11 floors on the ground with an area of ​​46,720 square meters. The extrusion adopts PHC-AB500 hammered pipe piles; the engineering foundation pit soil layer from top to bottom includes: manual filling Soil (thickness 2.8-3.4m), silty soil (thickness 2.2-5.5m); the groundwater of the site is pore water, which is mainly recharged by atmospheric precipitation and lateral seepage of aquifers. The groundwater level is high and it is close to t...

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Problems solved by technology

[0003] For example, the basement level of a certain engineering project is 6628 square meters, and there are 11 floors above the ground, with an area of ​​46720 square meters. PHC-AB500 hammer pipe piles are used for extrusion; the foundation pit soil layer from top to bottom includes: manual filling Soil (thickness 2.8-3.4m), muddy soil (thickness 2.2-5.5m); the...

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