Method and apparatus for constructing an offshore hollow column

Details Method and apparatus for constructing an offshore hollow column Method and apparatus for constructing an offshore hollow column

1987-09-22

1991-06-18

Corbin, David H.

Hydraulic and earth engineering

Marine structure or fabrication thereof

Cast in situ

425 63, E02D 2300

Patent

active

050245570

ABSTRACT:
A method and apparatus for forming a hollow column of concrete on a floating offshore platform by applying successive layers of concrete and reinforcing to a single surface slipform which outlines the inner or outer contour of the column. The column is intermittently or continuously lowered by means of gravity under the control of one or more cables. The column may be round, oval, rectangular or of any cross section, or any combination thereof, and may be open or closed at either end or at intermediate levels. The column may be segmented into sections and have relatively thin walls as in an OTEC cold water pipe, an outfall sewer, or an underwater tunnel; and a method is described for safely deploying such columns at great depth on to an uneven seabed. The column may be monolithic with walls thick enough to support a structure above the surface or to maintain the hollow interior at amospheric pressure and provide access to an undersea habitat or to gas and oil well equipment. Air chambers with air lines leading to the surface may be placed at various levels on or within the wall to provide a means for adjusting the immersed weight of the column.

REFERENCES:
patent: 3249664 (1966-05-01), Georgii
patent: 3652755 (1972-03-01), Iorns et al.
patent: 3928104 (1975-12-01), Luckett et al.
patent: 4030864 (1977-06-01), Einstabland
patent: 4110991 (1978-09-01), Torkuhl
patent: 4443131 (1984-04-01), Olsen
patent: 4664556 (1987-05-01), Dixon

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