Large area silt fluid soil layer foundation pit suspension supporting comprehensive construction structure and method

Abstract

The invention discloses a large area silt fluid soil layer foundation pit suspension supporting comprehensive construction structure and method. The large area silt fluid soil layer foundation pit suspension supporting comprehensive construction structure comprises a plurality of retaining piles arranged on the side wall around a to-be-excavated foundation pit; profile steel enclosing purlins arranged on the inner sides of the retaining piles in attaching and surrounding modes, internal pit mixing pile strengthening bodies arranged on the inner side of the to-be-excavated foundation pit, external pit mixing pile strengthening bodies arranged on the outer side of the to-be-excavated foundation pit, anchoring steel driven into a soil layer on the outer side of the to-be-excavated foundationpit, and stay cables connected between the anchoring steel and the profile steel enclosing purlins in a fastened mode; and the retaining piles are composed of pipe piles and Larsen steel sheet piles which is welded and fixed to the two sides of pipe piles in a one-broken-two mode, and the corresponding Larsen steel sheet piles on every adjacent retaining piles are connected in a mutually interlocked mode. According to the large area silt fluid soil layer foundation pit suspension supporting comprehensive construction structure and method, an overall stable silt and fluid soil layer suspensionsupporting comprehensive body can be formed, stability and safety of large area silt fluid soil layer foundation pit supporting are guaranteed, and the positive effect is achieved on surrounding environment protection under the working condition.

Description

Technical field [0001] The application relates to the field of foundation pit construction, in particular to a comprehensive construction structure and method for suspension support of a large-area silt fluid soil layer foundation pit. Background technique [0002] With the continuous development of national infrastructure construction, the contradiction of construction land has become increasingly prominent, and many weak soil-based areas have been continuously developed and utilized. In the Yangtze River Delta, Jiangsu, Zhejiang, Fujian and Jiangxi regions, there are many silty soil layers with relatively large areas and depths. The development and utilization of underground space in this weak soil area is always a technical problem that plagues the field of deep foundation pit engineering because of the weakness. The silt depth in the soil area is relatively large, and some reach more than 30 meters. It is difficult to reach this depth for deep foundation support and excavatio...

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Problems solved by technology

However, there are many muddy soil layers with relatively large areas and depths in the Yangtze River Delta, Jiangsu, Zhejiang, Fujian and Jiangxi. The development and utilization of underground space in this weak soil area has always been a technical problem in the field of deep foundation pit engineering. The depth of silt in the soil area is relatively large, and some have reached more than 30 meters. It is difficult to achieve this depth due to the limitations of conventional support methods for deep foundation pit support and excavation in this area (such as steel sheet piles, cement-soil mixing piles, SMW construction method, etc.); if other ultra-deep support technologies are used, the cost will increase exponentially, and the silt fluid soil layer will bring great difficulty and uncertainty to the ultra-deep support project due to its extremely unstable characteristics

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