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虹桥商务区核心区一期面积约1.4 km2,供能管沟工程全长3 506 m。管沟结构设计采用内径4.2 m钢顶管或4 m混凝土顶管结合明挖法现浇箱涵方案。采用河道压载措施解决顶管浅覆土过河问题;采用高压旋喷加固保护减小顶管穿越对高架桩基的影响;设计承插式中继间协调钢顶管段与能源站结构间的差异沉降。对顶管井及一般明挖段小尺度基坑采用较规范标准降低基坑安全等级的进行优化设计;对顶管井结构进行三维分析,大直径顶管洞口依据有限元计算结果进行配筋加强;管沟在地块接口处预设临时封堵墙、变形缝及顶板挡土墙以便后续地块衔接。结合相关工程经验及规范要求,确定了管沟结构的保护标准。
The core area of Hongqiao Business District has an area of about 1.4 km2 and a total length of 3 506 m for energy pipe ditches. Pipe ditch structure design using 4.2 m diameter steel pipe or 4 m concrete pipe combined with open cut method cast-in-box culvert program. Adopt the riverway ballasting measures to solve the problem of pipe jacking over the shallow overburden; Adopt the high-pressure rotary jet grouting protection to reduce the influence of the pipe jacking on the pile foundation; design the interclosure between the steel pipe and the energy station structure settlement. Optimized design was adopted to reduce the safety level of the foundation pit for the top tube wells and the small scale foundation pit for the general digging section. Three-dimensional analysis of the top tube well structure was carried out. The large diameter jacking holes were reinforced according to the finite element calculation results. Ditch in the block interface at the pre-set temporary blocking wall, deformation joints and roof retaining wall for subsequent land convergence. Combined with the relevant engineering experience and regulatory requirements, to determine the protection of trench structure standards.