附加刚臂子母桩减小桩顶水平位移的研究

Study on Reducing Horizontal Displacement of Pile Top by Adding Rigid Arm Primary-Secondary Pile

在山区架空输电线路工程中,当坡度较陡时常因桩基础悬臂过长导致桩顶在荷载作用下产生过大的水平位移,无法立塔。设计了一种新型的抗侧移子母桩基础,在方便设计与施工的同时,可有效降低桩顶端水平位移,减小山区地形对塔位选择的限制。通过山西-江苏±800 kV特高压直流线路工程JC30103A塔型的实际算例验证了子母桩基础的可行性。

When overhead power transmission line is set up in mountainous areas,the over-length of thecantilever of pile foundation leads to the excessive horizontal displacement of pile top under load and no way toerect the tower in the case of steep slope. This paper designs a new type of anti-lateral shift primary pilefoundation,which is convenient for design and construction,and simultaneously effectively reduces thehorizontal displacement of pile top and the limitation of mountain topography on the choice of tower position. Apractical example of JC30103 A tower type in the Shanxi-Jiangsu ±800 kV ultra-high voltage DC line projectis given to verify the feasibility of the primary-secondary pile foundation.