Pull-back Force Calculations for a Long Distance Product Pipeline Crossing the Yellow River by Horizontal Directional Drilling

摘要

Pull-back force data is very important in designing pipeline crossing project by horizontal directional drilling,which is also the basis of choosing drilling machine.Through evaluating the maximum pull-back force,the damage of pipeline can be avoided.There have various factors influencing the pull-back force,such as engineering geological factors and operating conditions.There has no suitable universal mechanics model so far.In this paper the research object is a long distance product pipeline horizontal directional drilling crossing under the bottom of the Yellow River.Based on the research achievements and mechanics theory,the pull-back force has been respectively calculated by four kinds of methods,which are standard formula calculation,unloading arc earth pressure calculation,net buoyancy calculation and winch calculation.Then,the maximum pull-back force is determined by analyzing the applicable conditions and results of these four calculation methods.Finally,a securer,more effective and economical construction and pull-back force calculation method has been obtained,which can also provide valuable references for such kind of projects.