鲁固特高压直流黄河大跨越基础设计

鲁固特高压直流工程黄河跨越段跨距长、杆塔高度高、承载负荷大,因此基础作用力较大,且跨越塔位于黄河滩地中,地质、水文条件复杂,大跨越基础设计是工程设计的关键环节。结合跨越塔设计输入条件,通过采取系列结构优化措施,采用高承台桩加设钢连梁的基础设计方案,承台旋转45°并设置立柱偏心,采用最不利荷载组合,精确进行了结构抗震计算,连梁设计合理,可为后续工程的黄河大跨越基础设计提供参考。

Foundation Design for Long Span of Lugu UHVDC Crossing the Yellow River

Lugu UHVDC project in the Yellow River-crossing section has encountered technical difficulties such as large span,high tower,high external load,and complicated geological and hydrological environment.In this case,the design of crossing tower foundation is the key link of engineering design.Based on the design input conditions of crossing tower,and by adopting a series of structural optimization measures,high-level platform with steel beams is selected whose pile cap revolves 45 degrees with column eccentricity.The most unfavorable load combination is determined.Accurate seismic calculation of structures is carried out,proving that the design of connecting beam is reasonable.The above can provide design reference for the follow-up foundation design of the large-span crossing tower.