郑州市南三环东延线（南台路至107辅道）高压输电线路改造工程顶管穿越高速公路专项施工方案河南煤炭建设集团二〇一五年五月二日目录1编制依据及原则..............................................................................................................................................11.1编制依据......................................................................................................................................................11.2编制原则......................................................................................................................................................22、工程概况......................................................................................................................................................32.1整体概况...........................................................................................................................................................32.2一标段施工概况...............................................................................................................................................32.3穿越段施工概况...............................................................................................................................................43、环境情况工程地质概况及水文地质概况......................................................................................................43.1、顶管主要穿越土性........................................................................................................................................53.2机场高速路概况...............................................................................................................................................54、主要难点分析及应对措施............................................................................................................................54.1地表沉降及浅覆土顶进分析及对策................................................................................................................54.1.1地表沉降原因分析........................................................................................................................................54.1.2减少地表沉降措施.........................................................................................................................................5为减少地表沉降首先必须调查清楚高速公路路基下有无加固土体的粉喷桩、碎石桩等，根据调查后的实际情况选定相应的顶管掘进机，进行顶管施工。..............................................................................................54.1.3开挖面的土压力与出土量控制.....................................................................................................................64.1.4注浆压力和注浆量控制................................................................................................................................64.1.5顶管轴线纠偏控制........................................................................................................................................74.1.6顶进施工参数的控制....................................................................................................................................74.1.7沉降监测....................................................................................................................................................
