Mechanical Inspection and Safety Assessment on Overhead Crossing Structure of Long-distance Pipelines

Mechanical inspection contents and methods of overhead crossing structure in long-distance pipelines are summarized, including visual inspection, cable strength test and dynamic force inspection.Taking Mashuihe River suspension overhead crossing structure of Zhongxian-Wuhan Gas Transmission Pipeline as an research object, pulsating and wind load dynamics experiments are conducted.Calculation on displacement and inner force of overhead crossing structure at wind load and ice-wrapped load are checked and analyzed, and stresses of overhead crossing structure at multiple loads are computed.Comprehensive assessment on technology and safety of the structure is carried out.