马鞍山长江公路大桥左叉悬索桥中塔设计及施工
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摘要
马鞍山长江公路大桥左汊主桥为2×1 080m的三塔两跨悬索桥,中塔为钢-混叠合塔。通过对纵向为A形、人字形、I形3种结构形式进行研究分析,确定中塔采用I形钢-混叠合塔。中塔高为175.8m,其中钢上塔柱高127.8m,塔柱断面为单箱多室构成,钢-混接头采用无粘结预应力钢绞线进行锚固。钢塔架设中采用世界最大塔吊D5200K-240,通过厂内钢塔制造精度控制、现场跟踪测量、主动横撑线形调整,结合厂内预拼数据判断接头调整量等措施,保证钢塔安装精度,加快钢塔安装速度,创造了钢塔安装精度、安装速度的新记录。
The left branch bridge of Maanshan Yangzi river highway bridge is a three-pylon and two-span suspension bridge with main span arrangement of 2x1080 m.The steel-concrete composite structure is adopted in the middle pylon design.Through the comparison and analysis of the 'A' shape,'λ'shape and 'I'shape pylon structures,the 'I' shape steel-concrete composited pylon is adopted in the middle pylon design.The height of the middle pylon is 175.8 m,and the top part of the middle pylon is 127.8m high with a single box and multi-cell section.The steel and concrete joint is anchored by non-bonding prestressed steel strand which is first used in such structure and the largest tower crane D5200-240 is first used in the pylon construction.The installation accuracy of steel pylon is ensured and the installation speed is improved through many measures like manufacture accuracy control of the steel pylon segment in factory,tracking measurement on site,alignment adjustment using active transverse brace and joint adjustment quantity prediction by pre-assembly of steel pylon segment.The new record in accuracy and speed of the steel pylon installation are created.
The left branch bridge of Maanshan Yangzi river highway bridge is a three-pylon and two-span suspension bridge with main span arrangement of 2x1080 m.The steel-concrete composite structure is adopted in the middle pylon design.Through the comparison and analysis of the 'A' shape,'λ'shape and 'I'shape pylon structures,the 'I' shape steel-concrete composited pylon is adopted in the middle pylon design.The height of the middle pylon is 175.8 m,and the top part of the middle pylon is 127.8m high with a single box and multi-cell section.The steel and concrete joint is anchored by non-bonding prestressed steel strand which is first used in such structure and the largest tower crane D5200-240 is first used in the pylon construction.The installation accuracy of steel pylon is ensured and the installation speed is improved through many measures like manufacture accuracy control of the steel pylon segment in factory,tracking measurement on site,alignment adjustment using active transverse brace and joint adjustment quantity prediction by pre-assembly of steel pylon segment.The new record in accuracy and speed of the steel pylon installation are created.
引文
[1]安徽省公路勘测设计院,中铁大桥勘测设计院有限公司.马鞍山长江公路大桥及接线工程初步设计[Z].合肥:安徽省公路勘测设计院,2008.
[2]万田保,王忠彬,韩大章,等.泰州长江公路大桥三塔悬索桥中塔结构形式的选取[J].世界桥梁,2008(1):1-4.
[3]高康平,张强,唐贺强,等.马鞍山长江公路大桥三塔悬索桥中塔刚度研究[J].桥梁建设,2011(5):1-5.
[2]万田保,王忠彬,韩大章,等.泰州长江公路大桥三塔悬索桥中塔结构形式的选取[J].世界桥梁,2008(1):1-4.
[3]高康平,张强,唐贺强,等.马鞍山长江公路大桥三塔悬索桥中塔刚度研究[J].桥梁建设,2011(5):1-5.