【云南】龙江特大桥—特大桥最新资讯速递(十二)

龙江特大桥位于云南省西部、横断山脉南段，路桥垂直跨越龙江，大桥全长2470.58米，采用双向四车道高速公路标准，设计行车速度80公里/小时，系双塔单跨钢箱梁悬索桥，保山岸索塔高度为169.688米，腾冲岸索塔高度为129.703米。桥面离江面280米，最高的索塔顶到江面470米，主桥跨径布置为320米+1196米+320米，主跨长为1196米，比最近完工通车主跨为1176米的湖南矮寨大桥还长20米，是云南省首座特大跨径钢箱梁悬索桥，建成后将成为亚洲最大的山区悬索桥。

The Longjiang River is the largest obstacle along a new spur expressway that will branch off from the G56 to the city of Tengchong in western Yunnan Province.  To get across the 300 meter deep river gorge, the engineers have designed the longest span high bridge on earth with a tower to tower distance of 3,924 feet (1,196 meters) - nearly as long as the Golden Gate Bridge.  Longjiang will surpass the distance of both Aizhai and Balinghe Bridges which previously held the long span record honors among the world's highest bridges.
The Longjiang crossing will also be unique among China's big mountain suspension bridges with a thin steel box girder deck that breaks away from the traditional truss deck used on earlier bridges like Siduhe, Balinghe, Lishuihe and Aizhai.  The upcoming Puli Bridge in eastern Yunnan will also have a steel box deck.  The two towers on Longjiang will measure 548 feet (167 meters) and 393 feet (120 meters) high.      

Longjiang River Bridge Elevation















Longjiang Bridge deck cross section.





Longjiang Bridge tower elevations.





The main cable cross section showing the order in which the smaller hexagon bundles will be placed during the process of cable spinning.





A number of borings were made at different points on the river slopes.  The pieces are numbered to show the ground composition at progressively deeper elevations.  The location of the borings are indicated by highway kilometer points.










Longjiang Bridge and highway location map.

龙江大桥2011年8月5日开工建设，计划2014年12月31日前完工。
中交二公局二公司负责龙江特大桥A标施工，主要包含主桥上部结构安装(主索鞍、散索鞍、主缆、索夹、吊索、钢箱梁等)，保山岸索塔、锚碇、引桥及路基工程。

2013年1月21日上午9时，龙江特大桥保山岸主墩右幅承台混凝土浇筑完毕，标志着龙江特大桥主墩承混凝土    施工全部完成，为下一步塔身施工奠定了基础。大桥主塔承台为哑铃式结构,尺寸长21.4,宽21.4m,高6m，采用C40混凝土,设计混凝浇筑方量约为6308.2m³，分两阶段浇筑。
2013年4月16日凌晨1时，龙江特大桥锚块右幅第一层浇筑完成，浇筑面积1300多平方米，方量达2700多方；龙江特大桥锚碇为重力式锚碇，锚碇基坑开挖方量达50多万方，基底面积约6300多平方米，锚碇主体混凝土结构长88m，宽52.9m，高44.638m，锚体混凝土达9万多方，使用钢筋达2666吨。

保腾高速公路经过高黎贡山断裂带，地震烈度高，沿途多为火山地貌，山高谷深，建设难度较大。龙江特大桥是保腾高速公路的重点工程，也是云南省首座特大跨径钢箱加劲梁悬索桥。由于技术复杂，工程建设中的“云南强震山区千米级大跨悬索桥关键技术研究”被列为西部交通建设科技项目，该桥被列为云南省公路建设信息化试点项目.

涨见识了。主跨1196米，不做1200米，看来设计者还是比较清醒的，讲点实际最好。

多跨矮塔斜拉桥这个方案值得推荐