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冲击法钻孔是管柱基础施工中常用的一种方法,它是利用钻头自重下落冲击岩层,使之破坏来实现掘进。多年的施工实践表明,这种施工方法,如采用YKC—30型摇臂式钻机,由于冲程固定,不能适应不同岩层强度,且冲程过小,进度极慢;如采用摩擦式卷扬机用人工控制冲程,则工人劳动强度大,冲程难于控制,而冲程过大往往导致钻孔倾斜、管柱破损及钻头损坏等。若能研制一种可根据不同岩层
Impact drilling is a common method used in the construction of the pipe string. It is the use of the drill bit weight falling impact rock, so that the destruction of the tunneling. Years of construction practice shows that this construction method, such as the use of YKC-30 rocker drilling rig, due to the fixed stroke, can not adapt to different rock strength, and the stroke is too small, slow progress; such as the use of friction winch with manual control stroke , The workers are labor-intensive and the stroke is hard to control. Excessive stroke often leads to drilling inclination, column breakage and bit damage. If we can develop a different rock formation