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北新水闸建于奉贤北新港北端河口处,闸址距黄浦江口岸约230米,是一座净孔宽6米的节制闸。1985年4月初动工,1985年4月24日开挖到高程-1.0米时即进行混凝土封底。封底后发现封底层东侧20厘米宽的封底面上升,在12个小时内土层上升50厘米。工地几经对上升土突击清理均告无效。最后被迫停止浇筑混凝土,研究分析土层上升原因,并提出处理方案,图1是局部封底面上升情况。
Beixin Sluice was built at the mouth of the north end of Beixin Port in Fengxian. The gate site is about 230 meters away from the port of Huangpu River. It is a control gate with a net hole width of 6 meters. Starting in early April 1985, April 24, 1985 excavation to an elevation of -1.0 meters when the concrete back cover. Back cover and found that the back of the bottom layer 20 cm wide seal on the bottom rise, within 12 hours the soil rose 50 cm. Several times on the construction site assault raid cleared are invalid. Finally forced to stop the pouring of concrete, research and analysis of the reasons for the rise of soil, and propose treatment options, Figure 1 is the partial back cover up situation.