马鞍山长江公路大桥设计与创新

Design and Innovation of Maanshan Changjiang River Highway Bridge

马鞍山长江公路大桥左汊主桥为主跨2×1 080 m三塔两跨悬索桥,右汊为主跨2×260 m三塔斜拉桥。左汊三塔悬索桥中塔的设计原创性地采用了钢-混叠合和塔梁固结体系,有效解决了三塔悬索桥的主缆与鞍座间的抗滑移问题及主梁的刚度问题。右汊采用3个不等高的拱形塔斜拉桥,桥型新颖、线形流畅、简洁美观。左汊跨江心洲大堤桥梁基础采用新型根式基础,大幅度提高了竖向承载力,降低了工程造价。

The main bridge of Maanshan Changjiang River Highway Bridge over the left branch is a three-tower and two-span suspension bridge with main spans of 2 × 1 080 m and the main bridge of the Bridge over the right branch is a three-pylon cable-stayed bridge with main spans of 2）4260 m. To the intermediate tower of the suspension bridge over the left branch, the steel and concrete composite and the rigid fixity of the tower and girder system are innovatively applied and the problems of slip resistance between the main cables and tower saddle as well as the rigidity of the main girder of the bridge are effectively resolved. On the cable-stayed bridge over the right branch, three arch-shape pylons with unequal height are used, the bridge type thereof is novel, the geometric shape of the bridge is smooth, simplified and aesthetic. The foundations of the part of the left branch bridge spanning the river dyke on the central shoal are used with the new type of root foundations which greatly improve the vertical carrying capacity and reduce the construction cost.