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(一)、150M双线中承式就地灌注钢筋砼拱桥初步设计由我院与第四设计院合作进行,已于11月完成。主要设计原则为活等级中—26级桥面轨底至拱脚中心距离为1(?).6M,非地震区直线平坡。矢跨比采用1:4,拱肋轴线采用二次抛物线,拱肋中心距为11.2M,拱胁截
(1) The preliminary design of 150M double-track medium-type in-situ perfusion reinforced concrete arch bridge was carried out in cooperation with the Fourth Design Institute and was completed in November. The main design principle is that the distance between the bottom of the -26 bridge deck and the center of the arch foot is 1 (?) .6M, non-seismic straight-line slope. The ratio of pitch to span is 1: 4, the arch rib axis adopts quadratic parabola, the center distance of arch ribs is 11.2M,