峡谷地区大跨度贝雷桥施工技术研究

Study on Construction Technology of Long-span Bailey Bridge in Canyon Area

摘要:

某水电站勘探便道位于西藏自治区昌都市，是电站场内道路和导流洞等能够尽快施工的必要条件。勘探便道跨澜沧江部位采用单跨、净跨54.864 m贝雷桥。为使便道能尽快投入使用，满足电站关键项目施工工期要求，采用200型双层上下加强型贝雷钢桥， 通过悬臂推送法施工，在原有施工方法的基础上进行改进，利用钢桥的构件循环使用，在不增加额外导梁部件的前提下，15 d内完成全桥的架设，以节约成本，取得经济效益的最大化，可供类似工程借鉴。

Abstract:

A prospecting road of a hydropower station is located in Qamdo, Tibet Autonomous Region, which is a necessary condition for the construction of roads and diversion tunnels within the hydropower station as soon as possible. The single-span Bailey bridge is used for the prospecting road across the Lancang River. Its net span is 54.864 m. In order to make it into use as soon as possible and to satisfy the construction period requirements of key projects of the power station, the 200-type double-deck reinforced beret steel bridge is used and is constructed by the "cantilever" push method. And the bridge is improved on the basis of the original construction method. The components of steel bridge can be used for recycling. Under the premise of not adding the guide beam components, the erection of the whole bridge can be completed within 15 days in order to save the cost and achieve the maximization of economic benefit, which can be referred for the similar projects.