8月1日，工人们在昆明中铁电建总装车间庆祝硬岩掘进机“彩云号”下线。当日，我国自主研制国内最大直径硬岩掘进机（TBM）“彩云号”在昆明中铁电建总装车间下线。 “彩云号”硬岩掘进机刀盘开挖直径达到9.03米，是目前我国自主研制国内最大直径硬岩掘进机。据中铁隧道集团介绍，“彩云号”将应用于云南大理至瑞丽铁路高黎贡山隧道。滇西南地区地质构造运动活跃、地质条件复杂，尤其是高黎贡山，普通钻爆法难以施工，采用大直径敞开式隧道硬岩掘进机进行施工作业尚属首次。[新华社 井辉辉 摄]
Workers celebrate the completion of the tunnel boring machine (TBM) "Caiyun" in Kunming, capital of southwest China's Yunnan Province, Aug. 1, 2017. The Chinese made TBM, which has a 9.03-meter cutter head, was completed in Kunming on Tuesday and it will be used to drill a railway tunnel in the province. (Xinhua/Jing Huihui)