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宜昌至喜长江大桥大江桥为主跨838m悬索桥,猫道为三跨连续猫道,西坝锚碇为地连墙基础的重力式锚碇。由于桥塔和点军锚碇均已施工完成,为确保全桥工期目标,在保持猫道设计线形不变的条件下,通过在西坝锚碇前端设置1套转向架,实现猫道和西坝锚碇同步施工。猫道转向架为万能杆件拼装成的桁架结构,高20m,底部设扩大基础,在转向架上设置猫道承重索转向鞍座。施工时,在扩大基础上安装预埋件、拼装转向架,同时按西坝锚碇填芯混凝土实际浇筑高度,通过增加预埋件长度、设置支撑架来调整承重索锚固预埋件埋置深度;猫道导索、牵引索、门架支撑索、承重索、扶手索架设及面层、横向天桥等安装的同时,进行西坝锚碇施工;西坝锚碇施工完成后对猫道及牵引系统进行完善。
Yichang Xixi Yangtze River Bridge Dajiang Bridge mainly 838m suspension bridge, Cat Road for the three-span continuous catwalk, Xiba anchorage to wall-based gravity anchor. As the completion of the construction of the bridge tower and point military anchorage have been completed, in order to ensure the full bridge project duration, under the condition of maintaining the linear design of the catwalk, by installing a set of bogies at the front of the Xiba anchorage, catwalk and west Dam anchor 碇 simultaneous construction. The catwalk bogie is assembled into a truss structure assembled with universal rods, with a height of 20m. An enlarged base is arranged at the bottom, and a catwalk load-bearing cable is arranged on the bogie to turn to the saddle. At the time of construction, the embedded parts should be installed on the basis of enlargement and the bogies should be assembled. At the same time, the actual pouring height should be adjusted according to the concrete pouring height of the Xiba dam grouting core. The length of the embedded parts should be increased and the supporting bracket should be set to adjust the embedment depth ; Catheter guide cable, traction cable, gantry support cable, load cable, handrail set up and the surface layer, horizontal flyover and other installation at the same time, the construction of Xiba anchorage; Xiba anchorage construction is completed after the catwalk and traction The system is perfect.