自锚式结合梁悬索桥新型先缆后梁施工方法研究

发布时间：2018-08-27 08:44

【摘要】：当自锚式结合梁悬索桥跨度较大且跨越通航河流或深谷时,若采用传统方法施工,临时设施多、工期长、造价高,鉴于此,以武汉市江汉六桥(主跨252m的自锚式结合梁悬索桥)为背景,提出一种新型先缆后梁施工方法。该方法在钢梁顶推完后浇筑锚跨混凝土梁,架设主缆,张拉吊索,进行一次体系转换,形成钢梁悬索桥,然后利用主缆的承重能力架设预制桥面板。从施工辅助设施、对通航孔的影响以及结构受力等方面,对新型先缆后梁法与传统先梁后缆法进行对比,采用有限元软件对施工过程和成桥状态受力进行对比分析。结果表明:新型先缆后梁施工方法在施工经济性和安全性上有较大优势;2种方法成桥状态受力有一定差别,但成桥后结构受力均满足要求。江汉六桥采用新型先缆后梁施工方法施工,施工过程及施工完成后,主桥线形、内力均满足要求,且造价较低,验证了该方法的科学性、适用性。
[Abstract]:When the self-anchored composite girder suspension bridge has a long span and crosses a navigable river or deep valley, if the traditional construction method is adopted, the temporary facilities are more, the time limit is long, and the cost is high. In view of this, Based on Jianghan sixth Bridge (252m main span self-anchored combined beam suspension bridge), a new construction method of cable and beam is proposed. After the steel beam is pushed up, the anchor span concrete beam is put up, the main cable is set up, the sling is tensioned, the system is transformed, the steel beam suspension bridge is formed, and the precast deck slab is set up by using the bearing capacity of the main cable. From the aspects of construction auxiliary facilities, the influence of navigation holes and the force on the structure, this paper compares the new method of cable after beam and the traditional method of beam after cable. The finite element software is used to compare and analyze the construction process and the state of the bridge. The results show that the new construction method of cable and rear beam has great advantages in construction economy and safety. There are some differences between the two methods in the state of bridge construction, but the stress of the structure after the completion of the bridge meets the requirements. Jianghan sixth Bridge is constructed with a new construction method of first cable and rear beam. After the construction process and construction are completed, the line shape and internal force of the main bridge meet the requirements, and the cost is relatively low, which verifies the scientific nature and applicability of the method.
【作者单位】：中铁大桥勘测设计院集团有限公司;
【分类号】：U445.4

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