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“60老女人bbbbbb”-知识课堂

西安北站内近60老女人bbbbbb百米高铁桥梁华丽转身

来源: 金融界
2024-12-07 06:15:23

最佳回答

“60老女人bbbbbb”西安北站内近60老女人bbbbbb百米高铁桥梁华丽转身

  中新60老女人bbbbbb网西安12月6日电(记者 张60老女人bbbbbb远)经过近2个小时作业,西安北站大西场内全长97.9米的钢箱梁在6日凌晨实现“扇形”转身,正在建设的西安至延安高速铁路的一处“缺点”被连接上。

图为施工现场。张远 摄

  钢箱梁是大跨径桥梁常用的结构形式,一般用在跨度较大的桥梁上,因外型像箱子故叫钢箱梁。该高铁桥梁全称新建西延高铁西安枢纽联络线跨大(同)西(安)高铁连续钢箱梁,此次作业也是中国西北地区首次在高铁枢纽站内实施、跨既有高铁线路的最大规模连续钢箱梁转体施工。

  “我们优化了范围内既有大西高铁接触网绝缘措施,减少感应电对施工的影响。二是安排工务、电务等单位现场做好防护,减少施工对既有大西高铁的影响。”西安铁路局第二工程指挥部副指挥长康中伟说。

  承建方中铁一局项目负责人杨综纬表示,此次转体的桥梁重约600吨,水平坡度控制在2.5%以内,施工难度大、安全风险高,跨既有大西高铁施工是一大难点。“桥梁转体如同体操比赛,需又稳又准。”

  施工单位加强智能信息化施工过程监控,分别在梁体及支撑轨道梁上设置28个动应变监测,以及7个动态监测传感器实时监测结构状态,同时采用高精度卫星测量技术实时监控梁体空间姿态,确保转体施工稳定可靠。

  此次高铁桥梁枢纽站内转体,在中国先例较少。由西安铁路局、中铁一局、中铁第一勘察设计院组成的项目团队,在专家论证专项施工方案的基础上,反复预演制定详细措施。提前设置7组临时支架体系将需要转体的钢梁分段运抵现场,吊装至临时支架既定位置并焊接成型,最后配合转体系统将桥梁向右侧位移22.5度,最终精确无误到达预定位置。

  西安至延安高速铁路是陕北革命老区的首条高铁,与正在建设的西渝高铁共同形成南北大通道。线路全长299公里,建设标准为双线高速铁路,设计速度350公里/小时。线路投运后,西安至延安的运行时间将从目前的2个半小时缩短至1小时左右。(完)

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