Subway construction in Lanzhou, four times across the Yellow River, fill gaps in world construction | Lanzhou subway _ news
> On December 27, Lanzhou railway line Line 1 first stage deep Bridge South of Lanzhou City University (science and Technology Museum) shield right line tunnel under the Yellow River in "Golden City 4th" after 6 months after construction of shield machine successfully arrived at the North Bank of the yellow air shaft in the middle. Li Yalong photography
> Lanzhou rail line Line 1 first stage West Guan Ying Chan in xigu district, Lanzhou city, East to the town of Chengguan district, Dong gang, about 26 km long line, all underground lines. Rail transport company in Lanzhou city
On December 27, the "Golden City 4th" after 6 months of shield machine construction, tunneling arrived at the North Bank of the yellow air shafts in the Middle, at this point, the Lanzhou rail line Line 1 a project successfully four times under the Yellow River, marks all the heavy and difficult to control project is completed successfully.
27th, Lanzhou railway line Line 1 first stage deep Bridge South of Lanzhou City University (science and Technology Museum) shield interval after construction, the right line tunnel under the Yellow River arrived at the North Bank of the yellow air shaft in the middle.
Phase I of line Line 1 West Guan Ying Chan in xigu district, Lanzhou city, East to the town of Chengguan district, Dong gang, about 26 km long line, all underground lines, with a total investment of 19.816 billion yuan. Among them, deep Bridge South of Lanzhou City University (science and Technology Museum) shield "yellow" range, the Lanzhou customs between Ma Tan shield "yellow" range across the highest difficulty, security risk factor the largest and most complex construction technology of tunnel.
"Wear yellow" tunnel subject structure are is located in Yellow River River Xia more than 40 more than meters, River Xia 23 meters to 26 meters Zhijian, geological, and hydrological conditions complex, which River Xia Pebble content up to 81.95%, Pebble strength up to 200 trillion PA, plus Yellow River Pebble formation structure loose, permeable sex strong, in dig into process in the, very easy appeared River collapsed, even roof permeable, major risk.
In the upper reaches of the Yellow River as a result of hundreds of years of underground structure change and formation their own movement and other reasons, led to crossing the Yangtze River, huaihe River, large lakes and offshore construction techniques cannot be used directly, so construction of shield across the Yellow River was called "from scratch."
From November 1, 2014 to September 21, 2015, "Jin Cheng, 5th", "Jin Cheng 4th", "Golden City 6th" slurry shield machine have been sending, can't go wrong first attempt.
In 2015, experts in the field of rail transport had come to the deep South to College of Lanzhou City (provincial science and Technology Museum) shield "yellow" range, the Lanzhou customs between Ma Tan shield "yellow" construction site "interrogation pulse", "yellow" project defined as "world problems".
Face high pressure water through Chung, and face lost stability, and shield frame card machine, and spiral tube spewing, series problem, "wear yellow" shield frame construction site head said, each dig into a ring, need two hours, and this a ring of prepared time is dig into time of 10 times times, each shield frame dig top, are to according to construction programme strictly analysis compared Shang once dig into Hou of construction data, and monitoring data, on shield frame machine of attitude, and dig into torque, and note pulp volume, data for adjustment, engineers are to will adjustment Hou of data got simulation environment Xia repeatedly test, Stable results, field commanders will be ordered excavation of the directive.
In addition, taking Lanzhou customs between Ma Tan yellow shield "Jincheng 5th", "Golden City 6th" respectively, on November 1, 2014, April 6, 2015, originating from the Lanzhou customs station, two sets of shield machine through Yellow River tunnel boring work, on July 28, 2016, October 26, 2016 respectively arrived Ma Tan stations. At this point, the Lanzhou railway builders more than 700 days of unremitting efforts, the successful Shield security across Yellow River domestic precedent, scientific exploration of shield tunneling in the strata parameters for domestic and worldwide of similar construction to fill the technology gap.
> Editor: Ni Zi Jiang
Article keywords:Lanzhou Metro
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兰州地铁施工，四次穿过黄河，填补世界同类施工空白|兰州地铁_新闻资讯
> 12月27日，兰州轨道交通1号线一期工程深安大桥南至兰州城市学院（省科技馆）盾构下穿黄河区间右线隧道在“金城4号”盾构机历经6个月的施工后，顺利抵达黄河北岸中间风井。 李亚龙 摄
>兰州轨道交通1号线一期工程西起兰州市西固区陈官营，东至城关区东岗镇，线路长约26公里，全部为地下线。兰州市轨道交通公司供
12月27日，“金城4号”盾构机在历经6个月的施工后，掘进抵达黄河北岸中间风井，至此，兰州市轨道交通1号线一期工程成功实现四次下穿黄河，标志着全线这一重难点控制性工程顺利完工。
27日，兰州轨道交通1号线一期工程深安大桥南至兰州城市学院（省科技馆）盾构下穿黄河区间右线隧道经施工后抵达黄河北岸中间风井。
1 号线一期工程西起兰州市西固区陈官营，东至城关区东岗镇，线路长约26公里，全部为地下线，总投资198.16亿元。其中，深安大桥南至兰州城市学院（省 科技馆）盾构“穿黄”区间、兰州海关至马滩盾构“穿黄”区间为全线施工难度最高、安全风险系数最大、施工工艺最为复杂的区间隧道。
“穿黄”隧道主体结构均位于黄河河面下40余米，河床下23米至26米之间，地质、水文条件复杂，其中河床下卵石含量高达81.95%，卵石强度高达200兆帕，加上黄河卵石地层结构松散，透水性强，在掘进过程中，极易出现河床坍塌，甚至冒顶透水等重大风险。
黄河中上游地区因受到数百年来地下结构变化、地层自身运动等原因，导致穿越长江、淮河、大型湖泊及近海的施工工艺无法直接使用，因此盾构穿越黄河施工被称之为“从零开始的工程”。
2014年11月1日至2015年9月21日，“金城5号”“金城4号”“金城6号”泥水平衡盾构机相继始发，开始不能出错的首次尝试。
2015年，轨道交通领域内的专家专程来到深安大桥南至兰州城市学院（省科技馆）盾构“穿黄”区间、兰州海关至马滩盾构“穿黄”区间施工现场“问诊把脉”，将“穿黄”工程定义为“世界级施工难题”。
面 对高压水透涌、工作面失稳、盾构卡机、螺旋管喷涌等一系列问题，“穿黄”盾构施工现场负责人表示，每掘进一环，需要两个小时，而这一环的准备时间是掘进时 间的十倍，每次盾构掘进前，都要按照施工方案严格分析对比上一次掘进后的施工数据、监测数据，对盾构机的姿态、掘进扭矩、注浆量等数据进行调整，工程师们 要将调整后的数据拿到模拟环境下反复试验，在得到稳定的结果后，现场指挥员才会下达掘进施工的指令。
此外，承担兰州海关至马滩穿黄盾构区间的“金城5号”、“金城6号”分别于2014年11月1日、2015年4月6日先后从兰州海关站始发，两台盾构机经过黄河段掘进作业后，分别于2016年7月28日、2016年10月26日顺利到达马滩站。至此，兰州轨道交通建设者在历时700余天的不懈努力后，成功实现盾构安全下穿黄河的国内先例，科学探索出了盾构在砂卵石地层中掘进技术参数，为国内乃至世界范围内的同类施工填补了技术空白。
>责任编辑：倪子牮
文章关键词： 兰州地铁
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