12月22日，水利水电第七工程局有限公司的工人在穿黄隧洞内施工。位于河南郑州黄河铁路大桥上游30公里处的穿黄工程是南水北调中线建设的关键性、控制性工程。其中，横贯黄河河底的两条穿黄隧洞是整个穿黄工程最引人瞩目的控制性建筑物，每条隧洞总长4250米。承担施工任务的中国水利水电第七工程局有限公司等单位，想方设法 On December 22,,Water conservancy and hydropower construction bureau co., LTD., the seventh workers wearing yellow tunnel in construction.Is located in henan zhengzhou Yellow River railway bridge upstream 30 kilometers of south-to-north water transfer project is wearing yellow of the construction of the key/Controlling engineering.the,Across the Yellow River bed of the two wear yellow tunnel is the wear yellow engineering the most high-profile controlled building,Each tunnel with a total length of 4250 meters.Assume the task of construction of China's hydropower seventh construction bureau co., LTD., and other units,Trying to克服技术难题，保证工程正常有序进行，预计2012年12月底两条穿黄隧洞主体工程将完工。新华社记者 鲁鹏 摄 Overcome technical problems,In order to assure that the project and normal,At the end of December, 2012 is expected to two wear yellow tunnel the main body of the project will be completed.The xinhua news agency LuPeng perturbation

    12月22日，水利水电第七工程局有限公司的工人们在穿黄隧洞地面施工现场吊运钢绞线。新华社记者 鲁鹏 摄 On December 22,,Water conservancy and hydropower construction bureau co., LTD., the seventh of the workers were wearing yellow tunnel ground construction site hoisting steel wires.The xinhua news agency LuPeng perturbation

    12月22日，水利水电第七工程局有限公司的一名工人在穿黄隧洞内切割钢筋。新华社记者 鲁鹏 摄 On December 22,,The seventh water conservancy and hydropower construction bureau co., LTD., a worker in yellow in the tunnel inside cutting steel.The xinhua news agency LuPeng perturbation

    12月22日，水利水电第七工程局有限公司的工人在穿黄隧洞内施工。新华社记者 鲁鹏 摄 On December 22,,Water conservancy and hydropower construction bureau co., LTD., the seventh workers wearing yellow tunnel in construction.The xinhua news agency LuPeng perturbation