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近年来,由于冲击造孔存在的缺点较多,我国已开始用反循环钻机进行嵌岩桩基础的施工。实践证明,用反循环钻机钻岩,可以克服冲击式钻机的一系列弊病,它的钻进速度快,优点显著,如:不致出现冲击钻有可能出现的十字槽及其返工处理等问题;因旋转钻对孔壁扰动较少,加上其成孔较快,岩石在水中浸泡的时间较短,所以不易坍孔;此外,旋转钻对基岩情况反应灵敏,可与地质钻探资料进一步相验证。现将国内外嵌岩钻孔桩基础采用较多的循环旋转钻机与施工工艺的发展现状作一简介。并对嵌岩钻孔钻机选型提出若干探讨性意
In recent years, due to the shortcomings of the impact of making holes more, China has begun to use reverse circulation drilling rig rock-socketed pile foundation construction. Practice has proved that the use of reverse circulation drilling rig rock drilling can overcome a series of ills of the impact drilling rig, its drilling speed, the advantages are significant, such as: do not appear there may be impact drill cross recess and rework problems; Rotary drilling on the hole wall less disturbed, coupled with its faster hole, the rock immersed in water for a short time, so not easy to collapse hole; In addition, the rotary drill on the bedrock sensitive, and geological drilling data to further verify . At home and abroad will be rock-socketed pile foundation with more circulating rotary drilling rig and the status of construction technology for a brief introduction. And put forward a number of exploratory meanings for the selection of inlaid rock drilling rigs