Control method of slope rate during deep foundation pit excavation

Abstract

The invention belongs to the technical field of building deep foundation pits, and particularly relates to a side slope gradient control method in a deep foundation pit excavation process. The side slope gradient control method is characterized by including the steps: 1) deep foundation pit positioning and paying off; 2) deep foundation pit hierarchical excavation; 3) standard side slope groove construction; 4) piling horizontal reinforcement piles; 5) side slope gradient standard steel wire hanging; 6) slope repairing horizontal steel wire hanging; 7) precise slope repairing; 8) deep foundation pit timbering. By means of the construction process, including hierarchical excavation, hierarchical slope repairing and hierarchical timbering, matched with deep foundation pit timbering design conditions, the side slope gradient and integral stability of the foundation can meet design requirements; steel wires are tensioned on the side slope to serve as slope repairing control lines and approximately insusceptible to wind force, and whether the side slope gradient at any position of the slope face is accurate or not can be detected; a slope gradient detection ruler is used for detecting construction standard slope gradient grooves, a slope repairing control method of hanging slope repairing horizontal steel wires is adopted, and consequently large-area slope repairing operations on a same excavation level can be conducted, and high slope repairing efficiency is achieved.

Description

technical field [0001] The invention relates to a method for controlling the slope ratio of a deep foundation pit during excavation, and belongs to the technical field of building deep foundation pit support. Background technique [0002] At present, underground garages are generally installed in construction engineering design, so the construction process must first carry out deep foundation pit excavation and support construction. Whether the slope ratio control of deep foundation pit excavation is accurate or not is one of the key factors affecting the stability of deep foundation pit slope. The existing method of controlling the slope ratio of deep foundation pit excavation is to use the method of hanging the vertical line aligned with the lower edge of the foundation pit after the excavation of the foundation pit is completed, and roughly measure the level from the lower edge of the foundation pit to the upper edge. Calculate the slope rate after the distance is accura...

AI Technical Summary

Problems solved by technology

The existing method of controlling the slope ratio of deep foundation pit excavation is to use the method of hanging the vertical line aligned with the lower edge of the foundation pit after the excavation of the foundation pit is completed, and roughly measure the level from the lower edge of the foundation pit to the upper edge. Calculate the slope rate after the distance is accurate, so the design condition of layered excavation and layered support for deep foundation pits cannot be realized, and the slope rate of the foundation pit is seriously insufficient and the slope cracks, and even the foundation pit collapses. ACCIDENT

Images