摘要
杭绍台铁路椒江特大桥主桥采用(84+156+480+156+84)m双塔双索面4线高速铁路钢桁梁斜拉桥,纵向为半飘浮体系。钢桁梁采用2片主桁、N形桁式;桥面采用正交异性钢桥面板,与主桁下弦杆结合。桥塔采用H形钢筋混凝土结构,塔高190 m,其下设置圆端形承台+钻孔灌注桩群桩基础。全桥共布置120根斜拉索,斜拉索采用标准抗拉强度为1 860 MPa的锌铝合金镀层平行钢丝索。斜拉索梁端锚固采用锚拉板形式;塔端锚固在塔壁内侧的齿块上,并在塔壁内布置环向预应力束。在主通航孔两侧的塔墩设置主动防撞设施,同时在2个塔墩及杭州侧辅助墩处设置被动防船撞设施。对该桥抗风、风-车-桥系统空间耦合振动、抗震性能进行研究,结果表明各项性能均满足规范要求。该桥主桁采用大节段预制,浮运吊装,边跨顶推、中跨悬臂拼装的方案施工。
The main bridge of Jiaojiang River Bridge on Hangzhou-Shaoxing-Taizhou Railway is designed as a steel truss girder cable-stayed bridge carrying four-track high speed railway. The bridge is of a half-floating system longitudinally, having two pylons and five spans of 84, 156, 480, 156 and 84 m. The stay cables are arranged in double cable planes. The steel truss girder consists of two N-shaped trusses, the lower chords of which are connected with the orthotropic bridge deck. The pylons, rising 190 m, are H-shaped reinforced concrete structures resting on the foundations formed of round-ended pile caps and clustered bored piles. A total number of 120 stay cables are tensioned. The stay cables is formed of the parallel steel wires with zinc-aluminum alloy coating, and each with standard tensile strength of 1 860 MPa. The stay cables are anchored to the main girder via anchor tensile plates and to the pylons via the concrete blocks on the inner surface of pylon walls, and loop prestressing are arranged inside the pylon chamber. The pylon piers on the two sides of the main navigational span are protected by active collision-resistant devices and the two piers and the Hangzhou-side auxiliary pier are protected by passive collision-resistant devices. Tests were carried out to examine the wind resistance of the bridge and the wind-vehicle-bridge spatial coupling vibration. The results show that all the performances meet the code requirements. The main truss of the bridge was divided into long segments for prefabrication, and the segments were floated to the bridge site for installation. The side spans were constructed by incremental launching and the central span was constructed by cantilever assembly.
作者
张雷
马广
王召祜
ZHANG Lei;MA Guang;WANG Zhao-hu(China Railway Design Corporation, Tianjin 300308, China)
出处
《桥梁建设》
EI
CSCD
北大核心
2019年第5期73-78,共6页
Bridge Construction
基金
中国铁路设计集团有限公司科技项目（7218136,2019YY220601,2019YY220606）~~
关键词
高速铁路桥
斜拉桥
钢桁梁
桥塔
斜拉索
锚固结构
防撞设施
受力性能
high-speed railway bridge
cable-stayed bridge
steel truss girder
pylon
stay cable
anchorage structure
collision-resistant device
mechanical properties
