New calculation model for pipelaying resistance and drag reduction methods in trenchless technology

Calculation for pipelaying resistance in current construction conditions to choose correct pipelaying method is the key for project success in trenchless technology.The paper uses the mathematical analysis method and considers the effect of banding resistance in pulling process to set up the new calculation model.The calculated value of this model is 6 percent difference from measured value,it accords with fact in practice and has less errors and the drag reduction methods are useful for construction.