Design and Construction of Steel Hanging Box for East Cable Tower of Lingdingyang Bridge
As a three-span cable suspension bridge with steel box girder,Lingdingyang Bridge is located at Shenzhen-Zhongshan Link,characterized with the main span of 1 666 m,the main pier cap of 36 m in diameter,8m in height,double-walled steel hanging box of 36.2 m in inner diameter,16 m in height,1 783 t in weight,which serves as temporary cofferdam and permanent anti-collision box.In addition,the construction encounters complex stress and frequent change of the whole system.A finite element model is built to analyze the variation in the stress on different stages of the whole construction process,including hoisting&floating,overall lowering,bottom sealing&pouring,and pier cap pouring.The FE calculation results are close to the field monitoring data.Meanwhile,MSC.Dytran software is used to simulate a 100 000 t ship colliding with the front and side of steel hanging box,which shows that the maximum impact force is reduced by 5.6%and 7.4%respectively.The researches of steel hanging box show reasonable structural design,overall calculation method and feasible construction method.
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