A method for excavating foundation pit on soft soil with water content greater than 60%

Abstract

The invention discloses a method for carrying out excavation of a foundation pit on soft soil with the water content of 60% or more. The method comprises the following steps that a foundation pit areato be excavated is divided into three strip-shaped areas to be excavated, and the three strip-shaped areas to be excavated are provided with a first excavator, a second excavator and a third excavator correspondingly; firstly, first-stage excavation is carried out, then second-stage excavation is carried out, and finally, third-stage excavation is carried out so as to form three-excavator and three-step terrace type excavation; and due to the fact that the three excavators can create three new overlying crusts every day, namely three working surfaces, and the three sets of excavators can continuously perform construction in a full-load mode from now on. The method is adopted for construction, the working efficiency is influenced in the first stage and the second stage and is not influenced in the third stage, and the working efficiency is not influenced from the third stage, the influence on the construction period is small, the economic benefit is remarkable, and the method is particularly suitable for large-area soft soil excavation; and the method is beneficial to popularization and application and is high in social benefit.

Description

technical field [0001] The invention relates to the technical field of soft soil foundation treatment, in particular to a method for excavating a foundation pit on soft soil with a water content greater than 60%. Background technique [0002] Burial depth requirements for high-rise buildings; increasing the area of ​​the garage under the limited floor area ratio; and other requirements, now almost every new building has a basement; and the excavation of the foundation pit in the basement is a relatively dangerous For projects, it is generally necessary to formulate a special construction plan and demonstrate it by experts. The excavation of foundation pits in the basement is firstly related to safety, and secondly related to the quality of the project, including the quality of engineering piles and the quality of basement construction; the excavation of foundation pits in soft soil areas should strictly implement the corresponding national and regional norms and standards, i...

AI Technical Summary

Problems solved by technology

The excavation unit often stops on the hard crust on the surface and digs to the bottom, resulting in large-scale deviation and fracture of engineering piles, resulting in a large number of Type III piles and Type IV piles, causing major quality accidents and economic losses, and delaying the construction period

In some projects, cement mixing piles are generally used to improve the bearing capacity of the foundation, create conditions, allow the excavator to stop, and achieve layered, step-by-step, and terraced construction, but the cost is expensive

Images