ICE CAISSON FOR SEA AND RIVER BED PROSPECTING AND BORING FOR MINERALS OIL AND GAS

摘要

1325980 Caissons K E LANGNER 11 April 1972 16550/72 Heading E1H A caisson is formed by lowering a concrete ring B to a subaqueous bed by means of looped steel tubes D embedded in the ring the upper ends of the tubes then being connected to refrigerating plant on an annular float A to form a cylindrical wall of ice reinforced by the tubes D. The tubes are wound around drums controlled by winches in a detachable segmented annular float C surrounding float A and pass over pulleys in float A.