The trenchless pneumatic hammers which don t rotate themselves during drilling include impact moles, pipe ramming hammers and pipe bursting hammers.
穿孔过程中自身不回转的非开挖气动锤包括沖击矛、夯管锤和爆管锤。
With the pipelines laying requirements continuously improvement some technical shortcomings of directional drilling technology and pipe ramming technology limit their use and development.