Station foundation trench earthwork excavation method

Abstract

The invention discloses a station foundation trench earthwork excavation method. The foundation trench earthwork excavation principle is that upper and lower layering excavation is carried out in thevertical direction according to the design position of a steel support, and erecting is carried out in real time when each layer is excavated to the position below the bottom level of the steel support by 50 cm; excavation from one end of a station to the other end of the station is totally adopted, implementation according to steps is carried out, structural construction is instantly started after earthwork excavation is completed by a lining unit distance, the exposing time of soil bodies on the two sides is shortened, and the anchoring shotcreting and steel support circulated beat can be accelerated; station earthwork excavation adopts the construction methods of vertical layering, longitudinal subsection, middle groove pulling and transverse edge expanding; and vertical layering, longitudinal partitioning, dual-way advancing, excavation after supporting, supporting circulation and concentrated pumping are carried out, excavation is carried out in two steps, the surface layer soil body is excavated by about 2 m in the first step, and the remaining soil layer is excavated in the second step, and five layers of steps are formed. The method is simple in step, reasonable in design,convenient to construct, high in construction schedule, good in construction effect and low in input construction cost.

Description

technical field [0001] The invention relates to the technical field of foundation pit excavation construction, more specifically, it relates to an earthwork digging method for a station foundation pit. Background technique [0002] With the development of my country's urban rail transit construction, there will be multiple line transfers in the subway project, and there will be various forms of stations. Open-cut stations have advantages in terms of investment and progress, but open-cut stations are affected by the surrounding environment. Restriction and traffic diversion, must take strong support measures. Because rail transit construction lags behind urban infrastructure construction, the surrounding buildings where most subway stations are located are becoming more complex and difficult to construct, especially for deep foundation pits with strict requirements on foundation pit levels (such as special-grade foundation pits) and complex surrounding environments When carry...

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Problems solved by technology

[0004] However, due to the limitation of the work space by the fixed horizontal support beams and the difficulty of excavating the earthwork, the existing excavation methods are difficult to guarantee the efficiency and safety of the construction, resulting in slow construction progress and poor construction effect, and the construction The increase in cost and the lack of necessary construction methods and support methods make it difficult to meet the safety standards for foundation pit excavation and the requirements for different geological conditions and surrounding environments, which may easily cause excavation deformation and affect the safety and use of surrounding buildings sex

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