大坪隧道位于云南省曲靖市会泽县境内，全长12.3公里，为Ⅰ级极高风险隧道。据中铁十八局项目现场 技术负责人宁赋岩介绍，隧道地处云贵高原喀斯特地貌区，地形起伏大、岩溶发育，地质构造复杂，施 工过程中面临突泥涌水、软岩大变形、高地应力等复杂多变的地质条件。为攻克长大隧道施工难题，建 设团队采用"长隧短打"模式，通过7个横通道开设9个正洞作业面施工，实现多工序平行作业、有效衔 接，同时利用瞬变电磁、长距离超前钻孔等多种先进技术手段，精准预测岩溶突水突泥风险。 新华社昆明11月25日电 记者从京昆高速铁路西昆公司获悉，11月25日，由中铁十八局承建的渝昆高铁 控制性工程——大坪隧道安全贯通。这一关键节点的突破为渝昆高铁全线建成通车按下"加速键"，标志 着这条连接西南重要城市的高速铁路建设取得重要进展。 随着大坪隧道的贯通，渝昆高铁云南境内隧道已贯通48座，隧道贯通已超90%。目前，渝昆高铁云南段 已全面进入冲刺阶段，每天投入1.4万余名施工人员，1500余台大型机械设备，全力推进重难点工程建 设。 渝昆高铁全长约700公里，其中云南省境内长388.6公里，是云南省内首条设计时速350公里的高速铁 路。渝昆高铁全线建成 ...

"我们采用国内较为先进的群枕式铺设工艺，日均铺轨进度达2.5公里，较传统铺轨方式工效提高 50%。"中铁二局哈铁项目部副经理董正敏介绍，施工过程中他们广泛应用信息化、智能化管理手段， 通过智能工程线调度信息平台，实现对铺轨机组、长轨运输列车等关键设备的远程实时监测，保证了各 单位施工运行安全。 据介绍，下一步，哈伊高铁项目将全面转入线路精调、"四电"工程和联调联试阶段。哈伊高铁建成 通车后，将进一步完善我国东北地区高速铁路网络结构，对促进区域经济社会发展、推动东北全面振兴 具有重要意义。（记者徐凯鑫、刘赫垚） 据了解，哈伊高铁于2024年5月28日正式启动铺轨，为确保施工进度和质量，中国铁路哈尔滨局集 团有限公司组织施工单位结合当地全年气候特征，加大物资、机械设备投入力度，成功克服高寒地区气 温低、施工期短等难题。 11月25日，在黑龙江省绥化市庆安县永华村哈伊高铁哈铁段铺轨现场，施工方中铁二局的四名工人 手持电动扳手，将最后一对钢轨螺栓拧紧，标志着我国"十四五"重点工程哈伊高铁全线铺轨贯通，为后 续联调联试奠定基础。 哈伊高铁是我国"八纵八横"高铁网京哈—京港澳通道的重要延伸，也是在建纬度最高、全年温差最 ...

渝昆高铁云南段隧道贯通超九成 中新网曲靖11月25日电 (吴栋良)25日，由中铁十八局承建的大坪隧道贯通。至此，渝昆高铁云南段隧道 已贯通48座，隧道贯通已超90%。 图为渝昆高铁大坪隧道建设施工现场。陈畅 摄 大坪隧道位于云南省曲靖市会泽县境内，全长12.3公里，是全线控制性工程，为Ⅰ级高风险隧道。隧道 地处云贵高原喀斯特地貌区，地形起伏大、岩溶发育，隧道穿越2处断层、1处向斜，Ⅳ、Ⅴ级围岩占比 近70%，围岩破碎、稳定性极差，开挖时极易出现塌方等险情，而且地下水丰富，最大涌水量每天达 3.7万立方米。 中铁十八局渝昆高铁项目部现场技术负责人宁赋岩介绍，施工中利用瞬变电磁、长距离超前钻孔等多种 先进技术手段，2次精准预测出岩溶突水突泥风险，顺利通过了1800多米的极高风险段落，平导连续3个 月掘进进度超过200米，为全隧按时贯通奠定了坚实基础。 图为建设者在渝昆高铁大坪隧道内工作。罗扬 摄 从重庆到昆明，渝昆高铁正在加速建设，随着大坪隧道的贯通，渝昆高铁云南段隧道已贯通48座，隧道 贯通已超90%。目前，渝昆高铁云南段全面进入冲刺阶段，每天投入1.4万余名施工人员，1500余台大 型机械设备，全力推进重难点 ...

中国最北高铁全线铺轨贯通 中新社哈尔滨11月25日电 (记者 史轶夫)中国铁路哈尔滨局集团有限公司25日发布消息称，中国在建最 北高铁哈伊高铁全线铺轨贯通，为后续联调联试奠定基础。 哈尔滨至伊春高铁是中国"八纵八横"高铁网京哈—京港澳通道的重要延伸，也是中国在建纬度最高、全 年温差最大，且首条穿越岛状多年冻土区的高速铁路，具有岛状冻土带分布零散、有效施工期短等施工 难题。 来源：中国新闻网 编辑：陈俊明 广告等商务合作，请点击这里 本文为转载内容，授权事宜请联系原著作权人 中新经纬版权所有，未经书面授权，任何单位及个人不得转载、摘编或以其它方式使用。 关注中新经纬微信公众号(微信搜索"中新经纬"或"jwview")，看更多精彩财经资讯。 11月25日，哈伊高铁全线铺轨贯通。图为在黑龙江省绥化市庆安县永华村哈伊高铁哈铁段铺轨现场。 (哈铁供图) 哈伊高铁于2024年5月28日正式启动铺轨，中国铁路哈尔滨局集团有限公司组织施工单位结合当地全年 气候特征，加大物资、机械设备投入力度，日均铺轨进度达2.5公里，较传统铺轨方式工效提高50%。 同时，广泛应用信息化、智能化管理手段，通过智能工程线调度信息平台，实现对铺轨 ...

Core Points - The Yiliang Tunnel right line of the Yukun High-speed Railway, constructed by China Railway Construction Bridge Bureau, has successfully completed its safe breakthrough after over 1460 days of continuous work [1][3] - The tunnel, located in Yunnan Province, spans 24.8 kilometers with a maximum depth of 920 meters, designed in a double-tunnel single-line format [1][3] Construction Progress - The breakthrough of the right line has accurately identified geological conditions, significantly improved ventilation and drainage, and effectively reduced geological risks, enhancing safety and efficiency for subsequent construction [3] - With the completion of the right line, 47 tunnels in the Yunnan section of the Yukun High-speed Railway have been completed, exceeding 85% of the total tunnel work [3] - The Yukun High-speed Railway, approximately 700 kilometers long with a Yunnan section of 388.6 kilometers, is designed for a speed of 350 kilometers per hour, marking it as the first high-speed railway in Yunnan to reach this speed [3] Economic Impact - Once completed, the railway will significantly reduce travel time between Chongqing and Kunming, playing a crucial role in constructing a new development pattern and promoting high-quality economic and social development in the surrounding areas [3]

Group 1 - The last pair of 500-meter long steel rails has been successfully laid in the middle section of the Yunling Tunnel on the Xi'an to Shiyan High-Speed Railway, marking the completion of the rail laying task for the Shaanxi section [1] - The total length of the main line track laid in the Shaanxi section is 323.93 kilometers, with 45 sets of switches installed, facing significant challenges due to steep gradients and high safety risks [1] - The construction team has achieved a maximum daily rail laying of 10 kilometers and an average daily progress of 6 kilometers while maintaining a welding pass rate of over 99% and millimeter-level track laying precision [1] Group 2 - The Xi'an to Shiyan High-Speed Railway is a crucial part of the "米" shaped high-speed rail network in Shaanxi, connecting major cities and significantly reducing travel time between Xi'an and Wuhan from 5 hours to approximately 2.5 hours [2] - The railway will enhance the national high-speed rail network and is expected to promote economic and social development along the route, particularly in connecting Shaanxi with the Yangtze River Delta and Pearl River Delta regions [2]

Core Points - The completion of the ballastless track construction for the Hubei section of the Xi'an to Shiyan High-Speed Railway marks a significant milestone in the project [1][4] - The construction of the ballastless track was managed by Wujin Passenger Dedicated Line Company and undertaken by China Railway Tunnel Group, covering a total length of 9,120.32 meters [4][6] - The Xi'an to Shiyan High-Speed Railway is expected to open in July 2026, providing a convenient high-speed rail connection between Xi'an and Wuhan, with travel times of under 1 hour to Shiyan and 2.5 hours to Wuhan [10] Construction Details - The ballastless track construction utilized CRTS I type double-block sleepers, with the structure primarily consisting of base plates and track bed plates [4] - The construction faced challenges such as interference from cross-construction and extensive project points, necessitating careful planning and organization by the construction unit [6] - Comprehensive measures were taken, including the development of specialized construction plans, operational guidelines, and optimization of construction tools and techniques to ensure smooth progress [6] Strategic Importance - The Xi'an to Shiyan High-Speed Railway is a crucial part of the national railway network planning and the "13th Five-Year" development plan for high-speed rail, designed for a maximum speed of 350 km/h [10] - The railway will enhance connectivity between the Guanzhong urban agglomeration and the Yangtze River midstream urban agglomeration, promoting socio-economic development along the route [10]

Core Viewpoint - The completion of the Sanguoshui Grand Bridge marks a significant milestone in the construction of the Yukun High-Speed Railway, which is expected to enhance transportation efficiency and promote economic development along the route [1][3]. Group 1: Project Details - The Sanguoshui Grand Bridge, located in Yunnan Province's Zhaotong City, features a main span of 168 meters and a total length of 546 meters, making it a large-span high-pier bridge [3]. - The bridge construction faced complex geological conditions due to its location in a mountainous canyon area, presenting significant challenges [3]. - The project utilized advanced construction techniques, including precise measurement and special drilling methods to ensure the stability of the bridge foundation under difficult terrain [3]. Group 2: Technological Innovations - Hydraulic climbing formwork technology was employed for efficient and safe high-altitude operations, ensuring the quality and progress of the pier construction [3]. - An intelligent temperature control system was implemented during the concrete pouring process to maintain the quality of the large-volume concrete [3]. Group 3: Project Significance - With the completion of the Sanguoshui Grand Bridge, the overall bridge construction for the Yukun High-Speed Railway is now 97% complete [3]. - The Yukun High-Speed Railway spans approximately 700 kilometers, with the Yunnan section measuring 388.6 kilometers and designed for a speed of 350 kilometers per hour, making it the first high-speed railway in Yunnan to reach this speed [3]. - Once operational, the railway will significantly reduce travel time between Chongqing and Kunming, contributing to the establishment of a new development pattern and promoting high-quality economic and social development in the surrounding areas [3].

Core Points - The Yukun High-speed Railway's Yanjin South Station's Baishui River Bridge has been successfully capped, marking a significant milestone in the construction of the railway [1][3] - The bridge is 787 meters long, with a maximum pier height of 82 meters and a main span of 152 meters, making it a challenging engineering project due to its height and complex terrain [3] - The Yukun High-speed Railway spans approximately 700 kilometers, with the Yunnan section measuring 388.6 kilometers and designed for a speed of 350 kilometers per hour, significantly reducing travel time between Chongqing and Kunming upon completion [3] Company Insights - China Railway Construction Corporation's bridge construction division is responsible for the Baishui River Bridge, showcasing the company's capabilities in handling complex infrastructure projects [1][3] - The project emphasizes an integrated design approach, combining the high-speed railway station and bridge to address site selection challenges while minimizing ecological impact [3] Industry Context - The Yukun High-speed Railway represents a significant advancement in China's high-speed rail network, being the first in Yunnan province to achieve a design speed of 350 kilometers per hour [3] - The completion of this railway is expected to enhance connectivity and reduce travel times in the region, reflecting ongoing investments in high-speed rail infrastructure across China [3]

Core Viewpoint - The completion of the contact network installation for the Xi'an to Yan'an high-speed railway marks a significant milestone, facilitating future power supply and testing for the entire line [1] Group 1: Project Overview - The Xi'an to Yan'an high-speed railway is the first high-speed rail in the revolutionary old area of northern Shaanxi and is a crucial part of the national high-speed railway network [1] - The railway, with a total length of 299.8 kilometers, is designed for a double-track high-speed railway with a maximum speed of 350 kilometers per hour [1] Group 2: Economic and Social Impact - Once operational, the travel time from Xi'an to Yan'an will be reduced from 2.5 hours to approximately 1 hour, enhancing the regional advantages of Shaanxi province and its position in the national railway network [1] - The project is significant for the revitalization of rural areas in revolutionary old regions and contributes to the optimization of the national high-speed railway layout [1]