论文部分内容阅读
根据大口径无循环旋挖钻具在青藏铁路施工现场的使用情况以及在此基础上的研究和改进,从而证明这些施工技术和设备已经达到和超过了国际先进水平,取得了较好的经济和社会效益。
According to the use of large-diameter non-circular rotary drilling tools in the Qinghai-Tibet Railway construction site and the research and improvement on this basis, which proves that these construction techniques and equipment have reached and exceeded the international advanced level, and achieved good economic and Social benefits.