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三门峡黄河公铁大桥首推成功 将创三项世界纪录

2017-05-27 17:51:52   央广网

央广网三门峡5月26日消息(记者郭淼)据《央广新闻》报道,5月26日上午10时,在河南省三门峡市蒙华铁路黄河公铁两用大桥钢桁梁首推段顶推成功。该桥建成后将创造世界顶推长度最长、重量最大、活载最重三项世界纪录,刷新了世界顶推长度最长、重量最大的钢桁梁桥的郑州黄河公铁两用大桥世界纪录。

由中国铁建大桥局承建的蒙华铁路三门峡黄河公铁两用大桥,全长5663多米,北起山西省运城市,南至河南省三门峡市,横跨黄河连接山西、河南两个省区,是蒙华铁路全线控制性工程。主桥承载着四线铁路和六车道高速公路,其中下层为四线铁路,分别为双线“蒙西通道”、双线“运三铁路”,上层为宽28.5米,时速每小时100公里双向六车道高速公路。主桥梁部为连续钢桁梁,采用顶推法施工。顶推总长度为1142.5米,顶推总重量将近4.3万吨,相当于2万台普通轿车同时行驶在大桥上,设计活载473米/千牛,其顶推长度、重量、活载居世界首位。此前,世界顶推长度最长、重量最大的钢桁梁桥是郑州黄河公铁两用大桥的顶推最长距离为1080米、最大重量为3.6万吨。

中国铁建大桥局蒙华铁路项目经理李庆丰向中国之声记者介绍,自2015年8月1日开工以来,项目部针对基础施工环保要求高、库区水位落差大、超长大直径变径钻孔桩的施工难点,对钻孔施工进行方案优化,根据不同地质特点对钻机选型、钻头类型进行科学组合,历时22个月,完成了基础施工。攻克了超长(长98米,直径2.3m变2.0m)大直径变径钻孔桩施工、(双壁钢围堰最大尺寸为46.5×28.8×22.9m)大尺寸钢围堰下放以及高墩施工等难题。此外,为解决大桥进入梁部顶推阶段后,面临的顶推距离远、控制难度大等问题,他们使用计算机编程控制33台350吨级千斤顶,完成对顶推过程的同步性控制、实现顶推位置的精确调整,使梁体顺利平稳到达指定位置。中国铁建大桥工程局集团有限公司董事长、党委书记吴建顺表示,整个顶推施工将于2018年6月完成,以确保蒙华铁路2019年全线通车。

蒙华铁路纵贯7个省(区),正线全长1814.5公里,投资概算1900余亿元,是“北煤南运”新的国家战略运输通道,是继大秦线之后国内又一条超长距离的运煤大通道,也是世界上一次建成里程最长的重载铁路和国内规模最大的运煤专线。线路北起内蒙古浩勒报吉,终点到达江西省吉安,纵跨蒙、陕、晋、豫、鄂、湘、赣七个省区,蒙陕晋能源金三角地区的煤炭将通过陆路直达湘赣鄂等华中地区,将极大地促进沿线地区的经济发展。

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