Reasonable excavation method of deep large foundation pit under water-rich round gravel conditions

Abstract

The invention discloses a reasonable excavation method of a deep large foundation pit under water-rich round gravel conditions. The method comprises the steps that 1, excavation preparation is carriedout, particularly, a flood-proof wall is erected around the foundation pit, an annular drainage ditch communicating with a sedimentation tank is formed, construction layers are divided according to the construction depth, and construction sections are divided according to the construction area; 2, surface earth of the construction sections is excavated; 3, earthwork excavation is carried out on the first construction layer and the second construction layer; 4, earthwork excavation is carried out on the third construction layer and the fourth construction layer; 5, earthwork excavation is carried out on the fifth construction layer and the sixth construction layer; 6, earthwork excavation is carried out on the remaining construction layers, particularly, excavation is carried out circularly and gradually according to the steps from 3 to 5, remaining earthwork is excavated manually after excavation is carried out to 0.2-0.5m above the bottom of a foundation pit, and a concrete foundation cushion layer is poured; and 7, earthwork excavation is carried out on the rest construction sections, and particularly earthwork excavation is carried out section by section from the middle construction section to the construction sections on the two sides according to the steps from 2 to 6. The method can overcome the water-rich round gravel complex construction environment, reduce the foundation pit excavation risk and improve construction efficiency.

Description

technical field [0001] The invention relates to the field of foundation pit excavation construction, in particular to a method for rationally excavating deep and large foundation pits under the condition of water-rich round gravel. Background technique [0002] The foundation pit is an earth pit excavated at the foundation design position according to the base level and foundation plane size. Before excavation, the excavation plan should be determined according to the geological and hydrological data, combined with the conditions of the nearby buildings, and the waterproof and drainage work should be done well. Excavating foundation pits in areas rich in water and boulders has the problems of uneven self-bonding and poor stability of the soil, and high soil pressure and water pressure outside the enclosure structure, which poses a greater risk to the excavation of foundation pits. The invention is designed to overcome the complex construction environment of water-rich round...

AI Technical Summary

Problems solved by technology

Excavating foundation pits in areas rich in water and boulders has the problems of uneven self-bonding and poor stability of the soil, and large soil pressure and water pressure outside the enclosure structure, which poses a greater risk to the excavation of foundation pits