广西横钦高速郁江特大桥实现无配重毫米级合龙|日韩人妻无码精品久久久潘金莲
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中新网南宁7月31日电 (张子禾 童小桐)7月31日,广西横钦高速公路关键控制性工程——郁江特大桥成功合龙,标志着横钦高速建设取得重大进展,为全线通车奠定坚实基础。

据了解,横钦高速公路项目由中国能建葛洲坝集团投资建设、葛洲坝交投公司组建项目公司进行管理、葛洲坝一公司承建。该项目起于南宁横州市,终于钦州市钦州港,全长166.024千米。其关键控制性工程——郁江特大桥主桥全长980米,主跨580米,为双塔混合梁斜拉桥。桥梁总长2200米,是广西首座无配重毫米级合龙大跨径斜拉桥,也是广西目前在建第二大跨径斜拉桥。
“郁江特大桥是整个横钦高速通车的关键控制性工程,桥址处为喀斯特地貌岩溶地带,溶洞最大空腔高度达25.7米,地底下的大小溶洞垂直串联起来形成‘糖葫芦串’一样的溶洞群,给我们的施工带来很大考验。”中国能建葛洲坝一公司横钦高速项目负责人刘权厚说。
在施工过程中,项目团队为提高钻孔时穿越溶洞的成功率,根据不同地质情况,采用旋挖钻机分段逐级扩孔钻进、逐段拼接、下放钢护筒等方式施工。这一套创新工艺大幅提升了成孔功效,仅用3个月就完成主桥桩基施工。其中最长的一根桩基深至地下65米。
横钦高速郁江特大桥作为广西首座采用不压重方案实现毫米级合龙的大跨径斜拉桥,主梁由混凝土箱梁和钢箱梁两部分混合组成。主桥边跨为4×50米现浇箱梁,中跨分为37节段钢箱梁,最大节段重达280吨。与传统的配重合龙方式相比,不压重方案采取单端起吊的无压重合龙方式,使合龙段的受力更简单明确,便于更加合理地进行合龙工序及应力线性控制。
“这座大桥贯通后,可以将郁江两岸的通行时间缩短40%,成为广西东部最便捷的出海动脉,将北部湾国际门户港与广西腹地紧密连接。”中国能建葛洲坝交投横钦高速项目公司董事长张小将说。
据悉,横钦高速项目建成后,将大幅缩短广西东部地区与沿海港口的时空距离,与即将建成的平陆运河在钦州港水陆呼应,进一步完善广西陆海交通网络,推动西部陆海新通道覆盖范围实现由线到面,加速珠江—西江经济带及北部湾城市群建设,进一步提升广西对外开放水平。(完)
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