鲁班水库主坝为钢筋混凝土斜墙干砌条石坝。左坝段在坝基408m高程处设放空底孔,其闸门井检修平台离坝顶水平距34m,孤立于水库之中。为便于启闭机的操作、维修与管理,故需架设一座钢桁架结构的轻型人行桥,以供操作人员通行。 初拟钢架的架设施工方案有:现场拼装、浮运架设、整体吊装、悬臂推出和转体施工等方法。通过比较决定采用转体施工法。 The main dam of Luban reservoir is a reinforced concrete inclined wall dry-laid stone dam. The left dam section is provided with a vent hole at the 408m elevation of the dam foundation. Its floodgate access platform is 34m horizontal away from the dam crest, and is isolated from the reservoir. In order to facilitate the hoist operation, maintenance and management, it is necessary to set up a steel truss structure of the light footbridge for the passage of the operator. The first proposed steel erection of construction programs are: site assembly, erection of floating set, the overall lifting, cantilevered launch and swivel construction methods. By comparison decided to use swivel construction method.