白塔大桥桥墩柱桩的优化设计

Optimum design of the Baita Bridge column pile

白塔大桥原设计下部采用双幅结构，每幅采用２桩２柱设计，整个断面共４桩４柱，结合上部结构的优化，根据地质情况结构，将下部结构改为整体的双桩双柱型，盖梁采用预应力结构，这样使下部的桩桩减少一半，不仅节省了造价，缩短了工期，同时使整座桥梁更加美观．

The former sub structure of Baita Bridge design adopts double structure. Each one has two piles and two columns, and there are four piles and four columns in cross section. Now, according to the superstructure optimum and geological structure, the substructure has been changed to integrate double-pile and double-column type, and adopts prestressed cover beam. This way, the piles and columns of substructure will be cut in half, which makes bridge more beautiful, as well as result in low cost and shortened work time.