求翻译：有的甚至超过36小时，部分钻孔必须采用价格昂贵的牙轮钻头，才能施工；由于目前常规迥转钻成孔灌注桩采用的“大钻头小钻杆”钻具结构，刚度不足的钻杆难以抵抗较大粒粒卵碎石或其胶结物对钻头的径向偏斜力，以及钻压不足成孔时间过长等原因，成桩偏斜率控制难度大、有的工程相当比例的桩超出规范要求的1%，是什么意思？

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Some even surpasses for 36 hours, the partial drill holes must use the price expensive roller bit, can construct; Because the present convention revolution drills the hole filling pile to use “the big drill bit macaroni” the drilling tool structure, the rigidity is insufficient the drill rod with di

Some even over 36 hours, part drilling must used price expensive of teeth round bit, to construction; due to currently general building jiong go drill into hole perfusion pile used of "large bit small drill pipe" drill with structure, stiffness insufficient of drill pipe difficult to resistance larg

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