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1.勘察1.1 土质和地下水调查: 顶管进度受土质和地下水的影响,采用顶管法施工时,应对管道的沿线进行调查,以决定适宜的顶进工法;进行后背墙的强度和顶力计算;制订地下水的防范措施;改善土质;选择工具管及进行环境影响的估计。 调查项目: a、土的性能:密度、粒径、成分等;
1. Investigation 1.1 Soil quality and groundwater investigation: Pipe jacking progress is affected by soil and groundwater. When using the pipe jacking method, pipelines should be surveyed along the route to determine the appropriate jacking method; the strength and jacking force of the back wall should be measured. Calculations; Formulation of groundwater prevention measures; Improvement of soil quality; Selection of tool management and estimation of environmental impact. Survey items: a. Soil properties: density, particle size, composition, etc.;