Field measurements and preliminary assessment of pipe jacking forces

摘要

Jacking forces are of concern on microtunneling projects to ensure that pipe installation is completed without damage to the pipeline, failure of the shaft, or limitation of the tunnel drive length. Extensive field measurements have revealed a relationship showing that interface friction between the jacking pipe and the soil are directly related to the jacking force required to propel the microtunneling machine and pipeline. Jacking force measurements are evaluated in sections of the tunnel where no lubrication is applied to the outside of the pipeline and in subsequent sections where lubrication is introduced. Results of the evaluation for lubricated and non-lubricated segments are presented.