The decision support research of ultra-long distance pullback force computing model through the process of pipeline crossing pullback

Abstract

The calculation of pullback by the analysis of strain on pipe shows that it involves many disciplines. It is hard to build a mechanical model that is very consistent with the actual working conditions and with the general applicability. After summarizing the calculation method of domestic and foreign authorities or national standards, the paper derives a set of its own formulas. Based on statistical data of actual projects, the paper develops a formula more suitable for ultra-long pullback by comparing the computing result with the actual measured drag force, that is for engineering design and site construction personnel reference. The calculated value of ultra-long pullback coincides well with the engineering value. Three components of pullback resistance, all occupy a high proportion in back-dragging load, and the contribution of the pullback load weights back Trawler changes dynamically. Thus proving that the method is a reasonable, simple, reliable and effective method to predict pipeline status, and makes a useful exploration for the research to improve the existing prediction models in the future.