| 摘要 |
1526528 Fluid shattering of rock ATLAS COPCO AB 20 Sept 1976 [19 Sept 1975] 38927/76 Heading E1F [Also in Divisions B5 and F3] A method of breaking a hard compact material, e.g. in situ rock, comprises accelerating an elongate body 11 of relatively incompressible fluid to reach a velocity of sufficient magnitude that when directed into a cavity 12 in the material to impact against a surface of the cavity the material surrounding the cavity will be broken up by the pressure pulse created at the zone of impact of the fluid body as the kinetic energy of the body is destroyed. The fluid may be a liquid, a plastic material or a mixture of solids and liquids. Specified examples of such fluids are water, lead and Plasticine (R.T.M.). The fluid body may be directed against the bottom of the cavity or wholly or -partially against one or more portions of the side of the cavity, which may be a pre-drilled hole. Preferably the fluid body may have a length of 0.2 to 2.0m, may be wholly or partially confined by a rupturable capsule, may have a cross section diameter of between 70-100% of the free cross section diameter of the cavity or hole, and may be so accelerated as to have a terminal velocity of between 100 to 300 m/sec. Apparatus 10 used to accelerate the required body of fluid of the method preferably comprises a barrel 13, a back head 14 screwed into the rear of the barrel and having a check valved passage for the feeding of fluid into the barrel, a charge chamber 16 for a power fluid, e.g. pressurised air or a like gas, for accelerating the body of fluid, when released against the rear of said fluid body by appropriate actuation of a valve 17 associated with the chamber 16. The barrel may extend into the hole, may then terminate in a laterally deflecting plug. and may be provided with venting means for venting the air volume in front of the fluid body in the barrel. |
