直流特高压输电线路工程PHC预制管桩基础设计应用研究

Design and application of PHC precast pipe pile foundation in UHVDC transmission line project

对于特高压直流工程,预应力高强混凝土(prestressed high-intensity concrete,PHC)预制管桩基础暂未有相关应用经验,主要缘于特高压直流输电线路工程通常具备地形条件复杂、基础荷载相对偏低等特点,导致PHC预制管桩基础的应用难度更高。通过分析PHC预制管桩基础设计方法,结合直流特高压工程典型地质、典型杆塔型式以及典型基础作用力,组合典型设计方案,就设计成果与常规灌注桩基础进行对比分析,探究直流特高压输电线路工程的PHC预制管桩基础设计特点,为直流特高压输电线路工程PHC预制管桩基础的应用提供设计优化思路。

PHC precast pipe pile foundation has no relevant application experience at present for UHVDC projects,,which is mainly due to the characteristics of UHVDC transmission line projects,such as complex topographic conditions and relatively low foundation load.By analyzing the design method of PHC precast pipe pile foundation,combined with the typical geology of UHVDC project,typical tower type and typical foundation force are considered in the typical design scheme.Then the design results of typical design scheme are compared with the conventional cast-in-place pile foundation,and the design characteristics of PHC precast pipe pile foundation of UHVDC transmission line project are explored.lt provides a design optimization idea for the application of PHC precast pipe pile foundation in UHVDC transmission line project.