渝黔铁路夜郎河大桥主桥设计关键技术

发布时间：2018-01-15 18:34

本文关键词：渝黔铁路夜郎河大桥主桥设计关键技术　出处：《桥梁建设》2017年05期 　论文类型：期刊论文

【摘要】：渝黔铁路夜郎河大桥主桥采用一跨370m的上承式钢筋混凝土拱桥。拱脚采用等截面实心超大桩径倾斜桩基础(截面长22.502 m、宽16.388 m),工程量及边坡开挖量小且施工安全、环保。主拱圈采用2个单箱单室拱肋相交组成的X形拱圈,极大地提高了桥梁的横向刚度,主拱圈外包混凝土分层(可减少对劲性骨架的强度要求)分段(可增加工作面)浇筑。钢管混凝土劲性骨架采用由通长钢管组成的桁架拱,钢管内灌注泵送混凝土,采用扣挂法节段拼装施工;通过扣索调整上、下弦钢管中的应力,管内混凝土替代了部分钢材。桥面系采用每孔跨径38m的钢-混连续结合梁,采用大节段吊装拼装钢梁、现场分段浇筑桥面混凝土的施工方案。
[Abstract]:The main bridge of Yilang River Bridge on Yu-Qian Railway adopts a 370m span reinforced concrete arch bridge, and the arch foot adopts the inclined pile foundation with the same cross-section solid super-large pile diameter (the section length is 22.502 m). The width of the arch is 16.388 mm2, the amount of engineering and slope excavation is small, the construction is safe and environmentally friendly. The main arch ring is composed of two single-box and single-chamber arch ribs, which greatly improves the transverse stiffness of the bridge. The main arch ring covers the concrete layer (which can reduce the strength requirement of the normal skeleton) subsection (can increase the working face) pouring. The steel tube concrete rigid skeleton adopts the truss arch which is composed of long steel pipe. The concrete is pumped inside the steel tube, and the section is assembled by the method of clasping and hanging. By adjusting the stress of the lower chord steel pipe, the concrete in the pipe replaces part of the steel. The bridge deck is composed of steel-concrete continuous composite beam with a span of 38 m per hole, and a large segment hoisting and assembling steel beam. The construction scheme of the concrete of the bridge deck in the field.
【作者单位】：中铁二院工程集团有限责任公司;西华大学;
【分类号】：U442.5
【正文快照】： 1工程概况渝黔铁路夜郎河大桥位于贵州省桐梓县夜郎镇与新站镇交界一带,横跨夜郎河沟谷,为双线客货共线铁路桥,客车设计行车速度为200km/h。主桥采用一跨370m的上承式钢筋混凝土X形拱肋拱桥,拱上桥面系采用每孔跨径为38m的钢-混连续结合梁,夜郎河大桥主桥立面布置见图1。桥位

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