Earthwork excavation method for long and narrow deep foundation pit

Abstract

The invention provides an earth excavation method for a long and narrow deep foundation pit. The earth excavation method fully utilizes the strength and rigidity of a ground connecting wall supportingstructure and is suitable for earth excavation in the form of the long and narrow deep foundation pit, which is constructed by a large excavator. Earth of the long and narrow deep foundation pit is divided vertically according to the vertical spacing of steel pipe supports, and layered horizontally according to the horizontal spacing of the steel pipe supports; an upper soil body is excavated ina mechanical large excavation mode; a lower soil body is subjected to step-shaped layered regression excavation, and a mounting platform is retained; and after the steel pipe supports of the same vertical layer are mounted, a platform soil body is excavated, and the excavation of the next layer of soil continues until all construction is completed. The construction period can be obviously shortened; fewer construction machines are used, and exhaust emissions and air pollution can be reduced; and the supporting structure and a soil body of a middle trough are used fully, the use functions of the supporting structure and the soil body of the middle trough are developed, and convenience is created for the construction.

Description

technical field [0001] The invention relates to an earthwork excavation method for a long and narrow deep foundation pit, in particular to an earthwork excavation method for a long and narrow deep foundation pit in the form of an underground continuous wall and steel pipe inner supports. Background technique [0002] With the development of society and the advancement of construction technology, the depth and breadth of buildings and structures expanding underground are gradually increasing, which inevitably involves the earthwork excavation of deep foundation pits. Limited by the complexity of engineering geology and hydrology, the choice of construction machinery (boom height, radius of gyration, etc.), construction method (especially the form of support structure), when excavating deep foundation pit earthwork, it is necessary to Comprehensive consideration of various influencing factors can achieve safety, economy, speed and environmental protection in construction. [...

AI Technical Summary

Problems solved by technology

[0021] 1. The excavation speed of the above scheme is limited by the mechanical properties of the excavators and bulldozers in the foundation pit. Since the vertical distance between the supports during construction is generally 3-5m, the selection of excavators and bulldozers working in the foundation pit is also limited by the vertical support. The spacing, only small machines can be selected, and the excavation is slow;

[0022] 2. In the above scheme, grooves are left in the middle after the slope is pulled longitudinally, and the remaining soil on both sides is only used to balance the lateral pressure of the foundation pit, and its role is not fully utilized

Images