Excavation construction method for super-wide low-permeability silty deep foundation pit

Abstract

The invention relates to the technical field of foundation pit construction, in particular to an excavation construction method for a super-wide low-permeability silty deep foundation pit. The construction method comprises the following steps that the foundation pit is excavated in a low-permeability silty soil layer where foundation pit dewatering is not carried out, the action of earth berm under the super-wide characteristic of the foundation pit is fully used, excavation is conducted in a partitioned and layered mode, the earth berm is reserved by slotting a slot in the middle of the foundation pit, steel supports are erected, and the earth berm is excavated out, so that balance and stability of the earth berm and supporting structures in the foundation pit are ensured; and meanwhile, abnormal conditions of the foundation pit is closely concerned through foundation pit monitoring measurement, and the purposes of reducing interference of the supports to earth excavation equipment and accelerating construction progress are achieved. The stepped continuous excavation supporting construction is adopted, and excavation is conducted in a partitioned and segmented mode, so that layered, segmented, ordered and normalized foundation pit excavation is achieved, machine input is reduced, the number of times of earth relaying transferring is reduced, the machine using efficiency is improved, and repeated dispatching of machines in the excavation process is reduced.

Description

[technical field] [0001] The invention relates to the technical field of foundation pit construction, in particular to an ultra-wide low-permeability mud deep foundation pit excavation construction method. [Background technique] [0002] As we all know, at present, the population and construction of large and medium-sized coastal cities in China are basically saturated in the original planned urban area, the urban area of ​​the city is expanding to the surrounding area, the city is expanding to the inland and along the sea, and the construction of reclamation tidal flat areas is increasing. Traditionally planned road construction is mostly a combination of roads and bridges and culverts. There are also many large-scale sunken passages in tidal flat areas to dredge urban roads in order to plan city appearance and city appearance in urban construction. However, construction in areas with poor geological conditions such as tidal flats At this time, according to the traditional ...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings of the existing methods such as dewatering first and then excavation, mutual interference between support and excavation machinery, and long exposure time of foundation pit excavation. In low-permeable muddy soil layers, foundation pit dewatering is not set. , save the precipitation period before the excavation of the foundation pit, carry out trough first and then layered and segmented slope excavation on both sides in the excavation of the foundation pit, reduce the interference between the erection of internal supports and mechanical equipment, and improve the excavation in soft soil layers An ultra-wide low-permeability silt deep foundation pit excavation construction method with high construction efficiency

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