Design and construction method of deep foundation ditch

Abstract

The invention discloses a method for designing and constructing deep foundation pits, utilizing outer open caissons as curtain as well as supporting structures for the construction of the deep foundation pits. The method comprises the following steps that: (1) precipitation is carried out; (2) an outer open caisson is sunk to a specified elevation; (3) partial precipitation is stopped, and water is poured into the inside of the open caisson at the same time, so as to balance water levels inside and outside the outer open caisson; and (4) a remaining internal structure is reconstructed. The method for designing and constructing the deep foundation pits can reduce the waste of water resources, protect natural environment better, prevent the damage to adjacent built structures in foundation pit construction and guarantee safety. Meanwhile, as the method replaces water-stop curtains and foundation pit supports with the open caissons and steel pipes, the design effect of integrating a foundation pit supporting and a constructed structure is achieved, which can shorten construction period and reduce cost.

Description

technical field [0001] The invention relates to a method for designing and constructing a deep foundation pit of a building. Background technique [0002] During the excavation process of the foundation pit, when excavating the foundation pit whose bottom surface elevation is lower than the groundwater level, groundwater will continuously infiltrate into the pit. The existence of groundwater not only makes it difficult and time-consuming to excavate the foundation pit, but also makes the slope prone to collapse. It will also cause the foundation to be soaked in water, disturb the foundation soil, cause uneven settlement of adjacent buildings, and crack or destroy the building. Therefore, in the traditional foundation pit excavation construction, according to the engineering geology and groundwater conditions, measures are taken to lower the groundwater level, so that the foundation pit excavation and construction can reach an anhydrous state, so as to ensure the quality of t...

AI Technical Summary

Problems solved by technology

However, large-scale and large-capacity continuous precipitation will cause waste of resources, destroy the balance of natural groundwater, cause soil instability near the foundation pit, damage to trees, and may even cause the surrounding built houses, municipal facilities and other foundations to settle. The house is tilted and collapsed in severe cases, and environmental and safety problems follow

However, the design and construction of water-stop curtain and foundation pit support are complex, with a long construction period and large investment

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