PERCUSSIVE MACHINE FOR MAKING HOLES IN GROUND Russian patent published in 1998 - IPC

FIELD: construction; applicable in trenchless laying of various service lines. SUBSTANCE: machine has body with striker and longitudinal ribs on its exterior surface at least one recess is found on body exterior surface and displaced with respect to center of its gravity along axis and forming with ribs and hole surface, in interaction of machine with ground, hollows individually communicated with source of fluid medium under pressure. It is possible to make on the body four ribs and two recesses located on its front and rear parts, respectively, that increases value of forces applied to the body and maneuverability. It is also possible to make cross-section of body stage limiting recess on the side of its rear part larger than cross-section of body stage limiting recess on the side of its front part that increases sealing of formed hollows and reliability of machine. In addition, formed hollows may be communicated with source of fluid medium through channels located in ribs. EFFECT: simplified design, higher reliability and maneuverability in making straight holes and holes with preset path. 4 cl, 4 dwg