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本文叙述了按价值工程分析的方法，对软土地基数种沉井下沉方案，从技术、经济和综合评价角度出发，对沉井一次下沉到位还是二次下沉到位，排水与不排水的下沉方式，依据质量、工期、成本等指示体系，进行了全面对比评价，选择了一次下沉到位的施工工艺，其实施结果达到了预期的目的．浙江北仑港电厂一期工程（２×６００ＭＷ）位于浙江宁波甬江人海口南ｇｋｍ的沿海滩地．一期工程循环冷却水取自海水．循环水泵房下部沉井结构是取水系统中的关键项目，针对沉井规模较大，结构复杂，下沉施工难度大，安装要求高的特点，对下沉方案按价值工程方法进行了评价，决定将原施工组织设计中＂二次制作、二次下沉＂的方案改为＂一次制作、一次下沉＂的方案，克服了地基松软、地面标高高于沉井一次下沉后的顶面标高、沉井重量偏心、下沉系数偏大和终沉标高较难控制等不利因素．实现了一次排水下沉和千封底，取得了良好的技术经济效果。
This paper describes the method of value engineering analysis. Based on several types of caisson subsidence schemes for soft soil foundations, from the angle of technology, economy, and comprehensive evaluation, the sinker sinks in place once or twice, sinks and undrains. Shen approach, based on quality, duration, cost and other indicators of the system, conducted a comprehensive comparative evaluation, selected a sinking in place of the construction process, the implementation of the results to achieve the desired purpose. Zhejiang Beilun Port Power Plant Phase I Project (2×600MW) is located along the beachfront of south gkm. The first-phase circulating cooling water is taken from seawater. The open caisson structure in the lower part of the circulating water pump house is a key project in the water intake system. For the characteristics of larger caisson, complex structure, difficulty in sinking construction, and high installation requirements, the value of the sinking scheme was evaluated according to the value engineering method. The plan of “secondary production and secondary sinking” in the original construction organization design was changed to a “one-time production, one-time sinking” program to overcome the softness of the foundation and the elevation of the surface above the surface of the sinker after a subsidence. , Sunken weight eccentricity, large subsidence coefficient and difficult to control the final sink height and other unfavorable factors. It achieved a drainage sinking and a thousand back cover, and achieved good technical and economic results.