Anti-overturning analysis of in-situ jacking foundation for 500KV high voltage transmission tower

Abstract

Taking the 500 kV double-circuit transmission line jacking project as the background, aiming at the overturning phenomenon that may occur in the foundation of the high-voltage transmission tower jacking process, the finite element software is used to establish a three-tower six-line tower-line coupling system calculation model, considering the wires Numerical analysis of wind load response, self-weight effect of transmission tower, and tower-line coupling tension. The research results show that the y-direction bending moment value of each independent foundation will be significantly changed after the jacking, and the y-direction bending moment value of the sole base No. 2 will have a greater increase. In addition, the y-direction bending moment values of the upper and lower connecting beams cast in-situ after the transmission tower is lifted will suddenly increase, indicating that when the high-voltage transmission tower is lifted in situ, each foundation must be strengthened to avoid longitudinal restraints at the bottom of the foundation. Sudden instability of bending moment.