DEVICE FOR ERECTION OF UNDERGROUND STRUCTURE FROM CAST-IN-SITU PRESSED CONCRETE Russian patent published in 2001 - IPC

FIELD: underground construction, particularly, devices for erection of underground structures from cast-in-situ pressed concrete; applicable in erection of tunnels and mine shafts. SUBSTANCE: device has a shield with hydraulic jacks, pressure ring, pressure forms whose external surface in zone of motion of pressure ring is parallel to device longitudinal axis. Hydraulic cylinders for moving of pressure forms in longitudinal direction are secured with their one ends to shield and with the other ends to pressure forms. External surface of pressure forms is narrowing at acute angle to the device longitudinal axis beyond the zone of movement of pressure ring, and then again parallel to device longitudinal axis. EFFECT: higher quality of erected structures from cast-in-situ pressed concrete. 5 dwg