1.Control the depth of the drilling operation at one time. It can not be drilled too deep, it is best to control 1/3 of the drill pipe height.
2.In the operation of metalling, the speed should not be too fast.
3.In the process of drilling, the speed increase is not suitable too fast, and it is suggested to rotate at low speed.
4.Pay attention to the size of drill size when selecting the drill bit. During the construction process, we should repair the drill bucket in time, and replace the bit and the gear tooth in time to ensure the hole size.
5.The drilling process should be slowly, and reverse Rotary Piling Machine should be used.
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