铁道建筑

针对传统墩顶转体桥梁因设置混凝土牵引盘而导致的墩梁连接处结构臃肿、景观效果差、材料浪费且施工复杂，同时环形滑道埋置于墩顶易与钢筋冲突且难以复用等问题，提出并验证一种新型的墩顶转体牵引及稳定系统方案。创新性地将牵引索锚固功能集成于可拆卸的扇环形钢结构撑脚上，取代混凝土牵引盘，并将滑道改造为装配式钢箱梁，分段预制、现场栓接拼装，转体后可拆除再利用。利用有限元软件建立模型，对新型撑脚、拉锚器及锚栓的受力特性及撑脚在滑道梁上的走行平顺性进行了数值模拟。结果表明：系统受力明确，关键部件应力水平可控，滑道梁平顺性满足要求。

To address the problems of traditional pier-top swivel bridges caused by the concrete traction turntable， such as bulky pier-girder connection， poor aesthetics， material waste， and complex construction， as well as the annular slideway embedded in the pier top being prone to reinforcement conflicts and difficult to reuse， a novel pier-top swivel traction and stabilization system was proposed and validated. The traction cable anchorage function was innovatively integrated into detachable annular-sector steel brackets， replacing the concrete traction disc， and the slideway was transformed into an assembled steel box girder， which was prefabricated in segments， bolted on site， and could be dismantled and reused after rotation. A finite element model was established to numerically simulate the mechanical characteristics of the new brackets， tension anchors， and anchor bolts， and the running smoothness of the brackets on the slideway beam. The results show that the system has a clear load path， the stress levels of key components are controllable， and the smoothness of the slideway beam meets the requirements.