(112+216+112)m部分斜拉桥设计

Design of(112+216+112)m Partially Cable-stayed Bridge

随着高速铁路桥梁技术的不断发展,部分斜拉桥凭借其良好的刚度、维修养护的便捷性以及经济指标良好等特点,近两年在铁路桥梁领域得到了广泛应用。本文以金建铁路新安江特大桥(112+216+112)m部分斜拉桥为研究对象,对其总体设计、主要技术标准、桥梁主体上部结构设计(含主梁构造及预应力体系、斜拉索及锚固系统、索塔、支座体系)及下部结构设计进行了阐述,对其整体力学性能进行全面分析,结果表明:采用(112+216+112) m三跨连续部分斜拉预应力混凝土箱梁桥式,结构体系为塔墩固结、主梁支座体系,索塔采用Y型索塔,交接墩采用圆端型空心墩,斜拉索采用空间双索面体系且呈扇形布置等结构设计形式是成功的,可为类似桥梁设计提供参考。

With the continuous development of high-speed railway bridge technology,the partially cable-stayed bridge has been widely used in railway bridge design in the past two years due to its high rigidity,low maintenance requirements,and excellent economic indicators.The paper is based on the part of the Xin’anjiang Super Large Bridge(112+216+112) m partially cable-stayed bridge of the Jinjian Railway.It covers the analysis of the general design,the main technical standards,the design of the main upper structure of the bridge(including the main beam structure and prestressed system,stay cable and anchorage system,cable tower and support system) and the design of the bottom structure of the bridge,and evaluation of the general mechanical performance of the bridge.The results shows that:the main bridge adopts the(112+216+112)m three-span continuous partially cable-stayed prestressed concrete box girder bridge scheme,the structural system uses fixed tower-pier with the main beam support system,and the cable tower adopts the Y-shaped cable tower,the round-ended hollow pier is used for the assistant pier,and the stay cables adopt the spatial double cable plane system and are arranged in a fan-shape.It is proved that the structural design form is successful,which may provide references for similar projects.