温州瓯江北口大桥主桥总体设计及结构选型
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摘要
温州瓯江北口大桥为高速公路和普通国道合建的通道,结合建桥条件对该桥主桥进行总体设计及结构选型。受通航孔位置、净空尺度控制,综合考虑防洪影响、结构受力和施工难度等因素,主桥采用主跨2×800m的三塔悬索桥。南边缆跨跨径为348m,北边缆跨设置6根背索,跨径为230m,两边跨均采用悬吊结构。选取平层合建和双层合建两种加劲梁方案进行比选,最终采用结构受力合理、建设难度较低的双层钢桁梁方案。为解决中塔主缆抗滑移的技术难题,该桥中塔选取整体结构刚度大、抗风稳定性好的纵向A形混凝土塔,并采用设置竖向摩擦板的中主索鞍。中塔基础采用整体性和稳定性好、能承受船舶直接撞击作用的沉井基础。边塔采用H形混凝土塔,钻孔灌注桩基础。南、北锚碇均采用安全可靠的重力式锚碇,北锚采用扩大基础,南锚采用大型沉井基础。
The Oujiang River North Estuary Bridge in Wenzhou provides a joint passage for expressway and ordinary national highway.The overall design and structural selection of the main bridge are carried out in combination with the conditions of bridge construction.Controlled by the location of navigation holes and clearance scale,a three-tower suspension bridge with a main span of 2×800 mis adopted for the construction of the main bridge after factors such as flood control,structural stress and construction difficulty being taken into account.The span of the side cable at the south is 348 m,and the side cable at the north is equipped with six back cables,with a span of 230 m.Suspension structures are used for both side spans.Two kinds of stiffening girder schemes for flat-layer joint construction and double-layer joint construction are selected for comparison and selection.Finally,a double-layer steel truss girder scheme with reasonable structural stress and low construction difficulty is adopted.Moreover,in order to solve the technical problem of antislip of the main cable at the middle tower,a longitudinal A-shaped concrete tower with high stiffness and good wind stability is selected in the middle tower of the bridge,and middle main cable saddle with vertical friction plate is adopted.The open caisson foundation with good integrity and stability which can withstand the direct impact of ships is adopted for the construction of the foundation of the middle tower.An H-shaped concrete tower and bored pile foundation are adopted in the construction of the side towers.Safe and reliable gravity anchorage is used in both south and north anchorage,enlarged foundation is used in north anchorage,and large open caisson foundation is used in south anchorage.
The Oujiang River North Estuary Bridge in Wenzhou provides a joint passage for expressway and ordinary national highway.The overall design and structural selection of the main bridge are carried out in combination with the conditions of bridge construction.Controlled by the location of navigation holes and clearance scale,a three-tower suspension bridge with a main span of 2×800 mis adopted for the construction of the main bridge after factors such as flood control,structural stress and construction difficulty being taken into account.The span of the side cable at the south is 348 m,and the side cable at the north is equipped with six back cables,with a span of 230 m.Suspension structures are used for both side spans.Two kinds of stiffening girder schemes for flat-layer joint construction and double-layer joint construction are selected for comparison and selection.Finally,a double-layer steel truss girder scheme with reasonable structural stress and low construction difficulty is adopted.Moreover,in order to solve the technical problem of antislip of the main cable at the middle tower,a longitudinal A-shaped concrete tower with high stiffness and good wind stability is selected in the middle tower of the bridge,and middle main cable saddle with vertical friction plate is adopted.The open caisson foundation with good integrity and stability which can withstand the direct impact of ships is adopted for the construction of the foundation of the middle tower.An H-shaped concrete tower and bored pile foundation are adopted in the construction of the side towers.Safe and reliable gravity anchorage is used in both south and north anchorage,enlarged foundation is used in north anchorage,and large open caisson foundation is used in south anchorage.
引文
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[7]西南交通大学.主缆与鞍槽间的抗滑移理论与试验研究报告[R].成都:2015.(Southwest Jiaotong University.Theoretical and Experimental Research Report on Anti Slip Between Main Cable and Saddle Slot[R].Chengdu:2015.in Chinese)
[8]西南交通大学.主缆钢丝与鞍座间侧向力理论与试验研究报告[R].成都:2016.(Southwest Jiaotong University.Theoretical and Experimental Research Report on Lateral Force Between Main Cable Steel Wire and Saddle[R].Chengdu:2016.in Chinese)
[9]王路,沈锐利,王昌将,等.悬索桥主缆与索鞍间侧向力理论计算方法与公式研究[J].土木工程学报,2017,50(12):87-96.(WANG Lu,SHENG Rui-li,WANG Chang-jiang,et al.Theoretical Calculation Method and Formula for Lateral Force Between Main Cable and Cable Saddle for Suspension Bridge[J].China Civil Engineering Journal,2017,50(12):87-96.in Chinese)
[10]沈锐利,王路,王昌将,等.悬索桥主缆与索鞍间侧向力分布模式的模型试验研究[J].土木工程学报,2017,50(10):75-81.(SHEN Rui-li,WANG Lu,WANG Chang-jiang,et al.Experimental Study on Distribution Pattern of Lateral Force Between Main Cable and Cable Saddle for Suspension Bridge[J].China Civil Engineering Journal,2017,50(10):75-81.in Chinese)
[11]德阳天元重工股份有限公司.温州瓯江北口大桥中塔主索鞍竖向摩擦板焊接工艺试验研究报告[R].成都:2017.(Deyang Tengen Heavy Industry Co.,Ltd.Experimental Research Report on Welding Process of Vertical Friction Plate of Main Cable Saddle of Middle Tower of Oujiang River North Estuary Bridge in Wenzhou[R].Chengdu:2017.in Chinese)
[2]李万恒,王元丰,李鹏飞,等.三塔悬索桥桥塔适宜刚度体系研究[J].土木工程学报,2017,50(1):75-81.(LI Wan-heng,WANG Yuan-feng,LI Peng-fei,et al.Rational Distribution Principle for the Pylon Stiffness of Three-Pylon Suspension Bridges[J].China Civil Engineering Journal,2017,50(1):75-81.in Chinese)
[3]西南交通大学.温州瓯江北口大桥动力特性分析及节段模型风洞试验报告[R].成都:2015.(Southwest Jiaotong University.Report of Dynamic Characteristics Analysis and Section Model Wind Tunnel Tests of Oujiang River North Estuary Bridge in Wenzhou[R].Chengdu:2015.in Chinese)
[4]罗扣,舒思利,万田保,等.温州瓯江北口大桥中塔结构形式比选[J].桥梁建设,2018,48(1):88-93.(LUO Kou,SHU Si-li,WAN Tian-bao,et al.Comparison and Selection of Structural Type for Middle Tower of Oujiang River North Estuary Bridge in Wenzhou[J].Bridge Construction,2018,48(1):88-93.in Chinese)
[5]马碧波,叶雨清,白雨东,等.瓯江北口大桥中塔设计及索鞍预偏影响研究[J].桥梁建设,2018,48(6):41-46.(MA Bi-bo,YE Yu-qing,BAI Yu-dong,et al.Design and Research on Intermediate Tower&Pre-Deflection of Saddles of Oujiang River North Estuary Bridge[J].Bridge Construction,2018,48(6):41-46.in Chinese)
[6]叶雨清,王昌将,马碧波.三塔双层悬索桥中塔结构选型研究[J].公路,2018,63(11):120-127.(YE Yu-qing,WANG Chang-jiang,MA Bi-bo.Research on Structure Selection of Three-tower Suspension Bridge with Double Deck Girder[J].Highway,2018,63(11):120-127.in Chinese)
[7]西南交通大学.主缆与鞍槽间的抗滑移理论与试验研究报告[R].成都:2015.(Southwest Jiaotong University.Theoretical and Experimental Research Report on Anti Slip Between Main Cable and Saddle Slot[R].Chengdu:2015.in Chinese)
[8]西南交通大学.主缆钢丝与鞍座间侧向力理论与试验研究报告[R].成都:2016.(Southwest Jiaotong University.Theoretical and Experimental Research Report on Lateral Force Between Main Cable Steel Wire and Saddle[R].Chengdu:2016.in Chinese)
[9]王路,沈锐利,王昌将,等.悬索桥主缆与索鞍间侧向力理论计算方法与公式研究[J].土木工程学报,2017,50(12):87-96.(WANG Lu,SHENG Rui-li,WANG Chang-jiang,et al.Theoretical Calculation Method and Formula for Lateral Force Between Main Cable and Cable Saddle for Suspension Bridge[J].China Civil Engineering Journal,2017,50(12):87-96.in Chinese)
[10]沈锐利,王路,王昌将,等.悬索桥主缆与索鞍间侧向力分布模式的模型试验研究[J].土木工程学报,2017,50(10):75-81.(SHEN Rui-li,WANG Lu,WANG Chang-jiang,et al.Experimental Study on Distribution Pattern of Lateral Force Between Main Cable and Cable Saddle for Suspension Bridge[J].China Civil Engineering Journal,2017,50(10):75-81.in Chinese)
[11]德阳天元重工股份有限公司.温州瓯江北口大桥中塔主索鞍竖向摩擦板焊接工艺试验研究报告[R].成都:2017.(Deyang Tengen Heavy Industry Co.,Ltd.Experimental Research Report on Welding Process of Vertical Friction Plate of Main Cable Saddle of Middle Tower of Oujiang River North Estuary Bridge in Wenzhou[R].Chengdu:2017.in Chinese)