为开发海洋,正进行着大规模的研究工作。最近,因濑户内海的突出岩石的疏浚及本洲四国建桥工程中桥墩的掘凿等,致使海底岩石的穿孔与掘凿工程大大地增加。但是,迄今为止,还没研制出可以简单地穿凿坚硬的海底岩石的钻孔设备。为达到在海底岩石上穿孔的目的,利用火箭的原理试制了火力钻机,经多次试验与反复改进,基本上达到了能实际使用 For the development of the ocean, a large-scale research work is under way. Recently, the perforation and excavation of seabed rocks have greatly increased due to the dredging of prominent rocks in the Seto Inland Sea and the pier digging of bridge piers in the four continents. However, to date, no drilling equipment has been developed that can easily penetrate hard seafloor rocks. In order to achieve the purpose of perforation in the rock on the sea floor, using the principle of rocket trial firepower rig, after repeated testing and repeated improvement, basically reached the practical use