求翻译：钻机就位前，应对钻孔前的各项准备工作进行检查，确保桩位准确无误。在钻孔方法上，根据本工程桩基础为嵌岩桩，优先采用冲击成孔法。在钻孔过程中始终严格控制和保持孔内水头，高出地下水位或施工水位2m以上，以保持孔壁稳固。是什么意思？

Drilling rig in place before the deal with all the preparations before drilling check to make sure the pile-bit accuracy. In the drilling method, according to the foundation piles for the piles, give priority to the impact of pore-forming method. In the drilling process has always maintained strict

drill holes on the former, should be conducted before the preparation work of the piles are inspected to ensure that accurate. The borehole method based on piles, in accordance with the present works for embedded rock piles, priority must be given to the introduction into holes shocks. In the drilli

Front the drilling machine takes place, should carry on the inspection to in front of the drill hole each preparatory work, guarantees the pile position accurately unmistakable.In the drill hole method, for inlays the crag pile according to this project pile foundation, first uses attacks Cheng Kong

Rig before the place should checked before drilling preparations, ensuring accuracy. In the drilling method, pile foundation for rock-socketed piles under this project, impact-drilling method takes precedence. Always strict control and maintain water in the hole during drilling, up from underground

Before the rig is in place, drilled in front of all the preparatory work should be checked to ensure that the pile position for the most part. In the drilling method, pile foundation for rock-socketed piles under this project, impact-drilling method takes precedence. Always strict control and mainta