2.2米大直径潜水钻机利用钻杆不转的特点,使其具有一系列钻孔工艺上的优越性,并可进行起吊、浇注等多功能操作,还可改为回转、冲抓、冲击多种钻法。在郑州黄河公路桥大直径深桩施工中,该钻机使工期缩短一半以上,技术指标达到了设计要求。 2.2 meters large diameter submersible drilling rig does not turn the use of the characteristics of the drill to make it a series of advantages on the drilling process, and lifting, casting and other multi-functional operation, but also to rotary, scratching, impact a variety of Drilling method. In Zhengzhou Yellow River Highway Bridge construction of large diameter deep piles, the drilling rig to shorten the construction period of more than half of the technical indicators have reached the design requirements.