Treatment for a Case Fracture of Steel Pipe Pile of Transmission Line Foundation
Steel pipe poles for transmission lines have been widely used in electric engineering due to their small foundation area occupation,satisfactory appearance compatible with urban landscapes,and faster construction compared to angle steel towers.However,special mechanical characteristics of steel pipe pole make its foundations subjected to large shear force and bending moment,and therefore foundations with large diameter and depth are generally required,whose design and construction quality directly affect structural safety and normal operation of steel pipe poles.However,diversified fac-tors such as geological situation,equipment issues,and heterogeneous cementitious material supply in practical construc-tion of pile foundations lead to high incidence of pile fractures.This paper reports the occurrence of a case fracture of an actual foundation steel pipe pile of a transmission line,and the proposed corresponding reinforcement scheme of which the implementation achieved standard-qualified class Ⅱ pile body in low strain test and might provide useful information for coping with similar issues.