苏岭山大桥主桥设计与施工
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摘要
苏岭山大桥主桥采用(70+240+70)m下承式连续钢桁拱桥,为双向8车道城市桥梁。主桁采用N形桁架,横向布置2片桁拱,桁间距38.2m,拱肋矢高54m,矢跨比为1/4.444。主桁上、下弦杆均采用带板式加劲肋的焊接箱形截面,主桁腹杆根据杆件受力分别采用箱形和H形截面,2片桁拱间设置8道空间桁架式风撑。桥面系为纵横梁格子梁体系,桥面板采用结构简支桥面连续的π形板,预制板同钢横梁之间设板式橡胶支座。吊杆采用PES7-109的镀锌平行钢丝,标准强度1 770MPa,吊杆标准间距7m。水中主墩为直径4m的圆柱形实体墩,采用双壁钢围堰施工。钢桁拱边跨采用临时墩辅助拼装施工,中跨采用吊索塔架辅助悬臂安装,跨中合龙。
The main bridge of Sulingshan Bridge is a through continuous steel truss arch bridge with spans of 70,240,and 70 m.The bridge carries eight lanes(four for each direction).The main truss adopts the N-shaped truss.The two steel truss arch rings,transversely spaced at 38.2 m,rise 54 m,and the rise-to-span ratio is 1/4.444.The upper and lower chords of the main truss adopt the welded box section with plate-type stiffening ribs.The web members of the main truss adopt the box and H-shaped cross section according to their load bearing behaviors.8 spatial trussframe wind bracings were installed between the two arch rings.The deck system is the lattice beam structure covered withπ-shaped slabs,forming a simply-supported structure with continuous deck.The laminated rubber bearings were installed between the precast slabs and the steel cross beams.The suspender is formed of PES7-109 galvanized parallel steel wires with standard strength of 1 770 MPa each.The suspenders are arranged at intervals of 7 m.The river main pier,a solid circular column with 4 mdiameter,was constructed by double-walled steel cofferdam.The sidespan steel truss arch was assembled with the aid of temporary piers.The central span arch was erected by cantilever assembly using fastening towers and cables,and closed at midspan.
The main bridge of Sulingshan Bridge is a through continuous steel truss arch bridge with spans of 70,240,and 70 m.The bridge carries eight lanes(four for each direction).The main truss adopts the N-shaped truss.The two steel truss arch rings,transversely spaced at 38.2 m,rise 54 m,and the rise-to-span ratio is 1/4.444.The upper and lower chords of the main truss adopt the welded box section with plate-type stiffening ribs.The web members of the main truss adopt the box and H-shaped cross section according to their load bearing behaviors.8 spatial trussframe wind bracings were installed between the two arch rings.The deck system is the lattice beam structure covered withπ-shaped slabs,forming a simply-supported structure with continuous deck.The laminated rubber bearings were installed between the precast slabs and the steel cross beams.The suspender is formed of PES7-109 galvanized parallel steel wires with standard strength of 1 770 MPa each.The suspenders are arranged at intervals of 7 m.The river main pier,a solid circular column with 4 mdiameter,was constructed by double-walled steel cofferdam.The sidespan steel truss arch was assembled with the aid of temporary piers.The central span arch was erected by cantilever assembly using fastening towers and cables,and closed at midspan.
引文
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[3]王志英,徐召,王洺鑫,等.济南长清黄河公路大桥主桥设计方案比选[J].桥梁建设,2016,46(4):97-102.
[4]张建功,翟晓亮,冯云成.大跨连续钢桁架拱桥设计[J].中外公路,2016,36(1):153-158.
[5]詹建辉,彭晓彬.大跨度组合梁斜拉桥结构设计方案研究[J].桥梁建设,2016,46(4):85-91.
[6]刘新华,师少辉,彭元诚.总溪河大桥主桥结构设计[J].桥梁建设,2016,46(5):95-99.
[7]孙英杰,徐伟.平潭海峡公铁两用大桥双层结合全焊钢桁梁设计[J].桥梁建设,2016,46(1):1-5.
[8]梅葵花,王贤良,赵育.多跨连续梁拱组合体系桥梁施工关键问题研究[J].桥梁建设,2017,47(4):48-53.
[9]孙九春.竖转提升工艺下拱肋体系转换与合龙控制方法研究[J].桥梁建设,2017,47(1):53-58.
[10]但启联,秦顺全,魏凯,等.基于平面梁单元的分阶段成形结构线形控制方程[J].桥梁建设,2017,47(4):42-47.