某主跨215 m下承式钢箱拱桥总体设计与计算分析

Overall Design and Computational Analysis of a Through Steel-Box Arch Bridge with 215 m Main Span

摘要:

贺州市昭平县桂江三桥横跨桂江，主桥采用计算跨径为215 m的下承式钢箱拱桥设计。主拱为钢箱拱肋，系梁同样采用钢箱截面，中横梁和小纵梁则采用工字钢，桥面板选用预制UHPC板。桥梁设计满足Ⅲ级航道的通航要求，兼顾2 000 t级单船的通航需求，通航净宽达180 m，净高为10 m。主桥施工采用先梁后拱法，主拱和主梁通过分段水上吊装拼接完成。在设计过程中，对主要构件进行了静力计算，并对主桥整体稳定性进行了详细分析。该桥梁方案的设计构思不仅科学合理，还可为类似工程提供有价值的参考。

Abstract:

The Guijiang Third Bridge in Zhaoping County of Hezhou spans the Guijiang River. The main bridge is designed as a through steel-box arch bridge with a calculated span of 215 meters. The main arch is made of steel box arch ribs, and the tie beams also adopt steel box sections. The middle crossbeams and small longitudinal beams are made of I-beams, and the bridge deck is selected from prefabricated UHPC plates. The bridge design fully complies with the navigation requirements of Class III waterway, accommodating the passage of 2000-t vessels. The navigation clearance width is 180 m and the clear height is 10 m. The “beam-first, arch-later” method is used in the construction of the main bridge. And the main arch and the girder are assembled by segmented overwater hoisting. In the design process, the static calculations are performed for the main components, and a detailed analysis on the overall stability of the main bridge is conducted. The design concept of this bridge scheme is not only scientific and reasonable, but also offers the valuable references for similar projects.