中国铁路工程首次应用“格构墩”结构,标志着山区高墩桥梁建设领域取得重要技术突破
云南文蒙铁路南溪河特大桥9#格构墩于11月12日完工。该项目首次在中国铁路工程中应用“格构墩”结构,通过预制拼装工艺提升了山区桥梁的抗震能力与施工效率,为中国铁路建设提供了新的技术范本。
AI-generated summary
文蒙铁路全长约116公里,是国家中长期铁路网规划中西南沿边铁路的重要项目。该铁路设计时速160公里,为国家Ⅰ级双线客货共线电气化铁路。
中新网昆明11月12日电 (记者 缪超)据中国铁路昆明局集团有限公司消息,云南文山至蒙自铁路(简称“文蒙铁路”)南溪河特大桥9#格构墩12日建设完工。这是中国铁路工程中首次应用“格构墩”结构,标志着中国在山区高墩桥梁建设领域取得重要技术突破。
南溪河特大桥位于云南省蒙自市芷村镇,全长789.71米,桥面与地面最大高差达118米,是文蒙铁路全线最高桥梁。
该桥所处地区地形起伏剧烈,跨越深切沟谷,且存在危岩落石、岩溶发育等不良地质,施工难度极大。因此,全桥共设计3座格构墩,其中9#墩高达105米,为全线最高桥墩,其格构部分分为7个节段/176个散件拼装工艺,最大单个构件重达24吨,犹如在百米高空“搭巨型积木”。
中国铁路昆明局集团有限公司滇南铁路建设指挥部相关负责人介绍,此次应用的钢管混凝土格构墩,通过钢管与工字钢拼装成“下宽上窄”的梯形墩体,内部灌注高强度混凝土,可节约混凝土和钢材30%至50%。同时,预制拼装工艺大幅降低了现场污染与施工风险,提升了抗震能力和地质适应性,实现了降本、增效、低碳、安全的多重价值。
中铁十八局文蒙铁路站前三标项目部负责人崔振喜说,为确保百米级格构墩实现毫米级拼装精度,项目团队专门布设高等级测量控制网,配备高精度测量仪器,安排专业测量团队进行精密放样;施工中同步运用导向定位、动态微调等专项工艺,多举措严控安装误差,确保护栏拼装精度完全符合设计标准。
此次格构墩的成功应用,研究形成的成套设计、施工及全生命周期运维技术,有望为其他铁路工程提供标准化技术范本。
文蒙铁路全长约116公里,设计行车时速160公里,为中国国家Ⅰ级双线客货共线电气化铁路,是中国中长期铁路网规划中西南沿边铁路的重要项目。建成后,将进一步完善滇东南路网结构,便利沿线各族民众出行,对促进边疆和民族地区经济社会高质量发展、服务云南高水平对外开放具有重要意义。
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