NV DTH drilling rig in the rock layers, rock layers, sand, clay, gravel, gravel layer, soft rock, hard-rock, hard rock and other hard rock and ordinary soil pile foundation construction can be carried out. It also can apply to temporary retaining the project. In particular, can pass through rock and gravel layers. Lighter weight machine, spiral way, you can use the crane equipment can be deep drilling. Spiral ----- To be able to apply to change and improve the efficiency of soil chisel drilling, using a spiral approach to rotation of the spiral drill rock and soil discharge, so no matter how long pile diameter and pile can be accomplished with a small amount of air. And can be deep drilling. Wall feature ----- chisel drilling the hole wall to prevent the collapse of the bentonite can Chisel injection liquid, or a protective agent to the slurry poured into the fill. ----- Pollution prevention techniques in dealing with very fine dust pollution, which is one of the characteristics submersible drilling hole hammer drilling machine. Compressed air is mixed with a small amount of oil, you can make internal equipment are adequately lubricated, can also prevent dust pollution.