ROLLER-TYPE REAMING DEVICE FOR BUILDING CAST-IN-PLACE PILES Russian patent published in 1997 - IPC

FIELD: construction and mining industry. SUBSTANCE: device can be used for sinking holes, strengthening of hole walls and building cast-in-place piles and for this purpose it has power-driven hollow shaft with radial outlet passages. Mounted on eccentric reamed necks of shaft are cylindrical rotatable and reversible devices, and mounted at both sides of cylindrical section in opposite directions are tapered rollers and their longitudinal axes are oriented at angle to longitudinal axis of device. Head-piece located in front of leading roller is rigidly connected with shaft and is provided with radial outlet passages and circular groove in surface for discharge of building slurry from inner space of driven shaft. Cross-sectional area of passages is increasing in direction of longitudinal axis of device. EFFECT: widened technological potentialities and increased productivity. 2 cl, 4 dwg