张家界大峡谷玻璃桥基础设计

摘要

Zhangjiajie Grand Canyon Glass Floor Bridge is a pedestrian suspension bridge with spatial cable planes and with span length of its main cables being 430 m.The bridge is located in the karst geomorphology area.In the light of the special topographic,geomorphic and geologic conditions at the bridge site,the anchorage of the bridge on the east side is designed as the gravity anchorage and the foundation of the anchorage is the open cut spread foundation (on the southeast side,the spread foundation is the rectangular one while on the northeast side,is the stepped one).The anchorage on the west side is designed as the tunnel anchorage with the section of its anchoring concrete plug being linearly varied and the length of the concrete plug being 13.5 m.The tower columns are all the reinforced concrete circular single column structures,the foundation of each column is comprised of 4 nos.of the manually dug piles of diameters 1.2 m.The piers are the column type frame pier structures with capping beams and under each pier,the foundation is the dug piles of diameters of 1.5 m.%张家界大峡谷玻璃桥是一座主缆跨度430 m的空间索面人行悬索桥.桥址位于喀斯特岩溶地貌区域,针对桥位处特殊的地形地貌和地质情况,东侧锚碇采用重力式锚,基础为明挖扩大基础(东南侧采用矩形扩大基础,东北侧采用阶梯式扩大基础);西侧锚碇采用锚塞体截面线性变化的隧道式锚,锚塞体长度为13.5 m.桥塔塔柱均为圆环形钢筋混凝土独柱结构,每根塔柱均采用4根直径1.2 m的人工挖孔灌注桩基础.桥墩采用桩柱式带盖梁的框架墩结构,每个墩柱下为直径1.5 m的挖孔灌注桩.