Ultra-Fast Portable Metallic/Concrete Plate Cutting

摘要

The goal of this report is to develop and evaluate methods of ultra-high and high-rate cutting technologies for use in military and civilian realm. The information presented in this report reveals that defeating exposed rebars, steel reinforced concrete walls, steel encased concrete doors, and steel plate doors is within reach of current technologies. We proposed to use or modify current technologies through clever engineering. Oxyfuel unit including 0.5-gallon gasoline tank with cutting torch assembly and 8 small cylinders of oxygen represents a typical portable unit. The overall weight of the package is 140 lbs. The capability of this package is cutting 400 rebars 1/2 inch thick or making a cut 180 inches long on a plate 2.64 inches thick. A typical portable cutting unit based on thermal lance concept has an overall weight 20 lbs., this includes handle and burning bar (3 lbs) and a small oxygen tank (16 lbs.). Oxygen consumption is typically 4 ft(3)/min. A small gas cylinder can support 4 min. of cutting activity. A small package containing 8 small cylinders (weight 140 lbs.) is capable of cutting 48 steel rods of diameter 2.94 inches. The same package can pierce in a 1.6 inch thick concrete plate 37 holes of diameter approximately 0.8 inch. Purity of oxygen is extremely important for fast cutting. A detailed analysis revealed that an optimum purity of oxygen is 99.5%.