Construction process of water foundation ditch rotary churning pile water stopping curtain
A construction technology and water-stop curtain technology, which is applied in foundation structure engineering, sheet pile wall, excavation, etc., can solve problems such as difficulty in digging foundation pit to the design depth, loss of soil bearing capacity, and deterioration of construction conditions.
Inactive Publication Date: 2008-10-22
NO 2 ENG CO LTD OF CCCC THIRD HARBOR ENG CO LTD +1
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Problems solved by technology
Once the quicksand occurs, the soil will emit quicksand while digging, and the soil will completely lose its bearing capacity, so that the construction conditions will deteriorate, and the foundation pit will be difficult to dig to the design depth.
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[0011] The present invention is two large-scale dock projects according to the No. 1 and 2# docks of the Changxing Shipbuilding Base of China Shipbuilding Base, and the scales of the docks are respectively 520m × 76m × 11.5m and 510m × 116m × 11.5m as specific examples to illustrate, 1# , 2# Dock entrance uses high-pressure jet spray piles as a water-stop curtain, which are connected with steel sheet piles on the dock wall to form a water-stop system for the dock. The water-stop curtain at the dock mouth is arranged along the front of the dock mouth, on both sides and three sides, and adopts double rows of high-pressure rotary grouting piles in a plum-shaped arrangement with a row spacing of 800mm. The designed pile diameter is φ1000mm, the spacing is 800mm, and the overlap between piles is 200mm. The jet grouting pile is 15.55m long, with a bottom elevation of -26.0m and a top elevation of -10.45m. A total of 869, with a total volume of about 10613m3, including 397 at the 1# ...
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The invention discloses a construction process for a jet grouting pile water-stop curtain of a foundation pit in water area and relates to a supporting structure for building foundation pits. The construction process mainly comprises the steps that: the process operation is performed through the arrangement of construction machinery after a jet grouting pile is tested, the construction for the jet grouting test pile is performed at the dock site, the jet grouting pile is determined, then the main material for the construction of the jet grouting pile, namely cement is piled on a platform outside a newly built temporary diking to build a cement silo, stones and soil are used to fill to increase the height of an existing platform, and the corresponding slope protection treatment is made, thereby smoothly finishing the construction to a water-stop curtain through a series of process flow and construction.
Description
Technical field: [0001] The invention relates to a support structure for a foundation pit of a building, in particular to a construction technique for a water-stop curtain of a rotary spraying pile for an foundation pit above water. Background technique: [0002] At present, when the foundation pit is excavated below the groundwater level, when the soil is fine sand or silt soil, a phenomenon called "quick sand" often occurs, that is, soil particles continuously flow from the edge of the foundation pit or Bottom popping phenomenon. Once quicksand occurs, the soil body will emit quicksand while digging, and the soil will completely lose its bearing capacity, so that the construction conditions will deteriorate, and the foundation pit will be difficult to dig to the design depth. In severe cases, it will cause the side slope of the foundation pit to collapse; the adjacent buildings will crack, sink, tilt or even collapse due to the hollowed out foundation. The cause of the q...
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IPC IPC(8): E02D5/18E02D5/46E02D17/02
Inventor 钟梅华汤涛孙伟明朱九仪张文渊徐桂强黎亚舟张敏赢章剑果施军刘明权姚娟强包益平杨东金卫林朱立新陈月娇
Owner NO 2 ENG CO LTD OF CCCC THIRD HARBOR ENG CO LTD