American Society of Civil Engineers


Cellular Cofferdam for Trident Drydock: Design


by Max D. Sorota, F.ASCE, (Vice. Pres., Fay, Spofford & Thorndike, Inc., Boston, Mass) and Edward B. Kinner, M.ASCE, (Vice. Pres., Haley & Aldrich, Inc., Cambridge, Mass.)

Journal of the Geotechnical Engineering Division
, Vol. 107, No. 12, December 1981, pp. 1643-1655

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Document type: Journal Paper
Abstract: A description is provided of the design of a steel sheet pile cellular cofferdam required for construction of a graving drydock. The cofferdam was constructed approximately 550 ft (168 m) offshore within the Hood Canal of Washington State and was required to retain 79 ft (24 m) of water after basin unwatering. Interlock tensions associated with the required cell diameter in this deep water location resulted in one of the first United States cofferdam applications of high strength steel sheet piling and extruded wye connections. Much of the cofferdam was designed to be permanent to provide in-service laydown areas adjacent to the completed drylock. Items discussed include the need for two pumped dewatering systems, the need for vibratory probe compaction of the cell and are fill, site soil conditions, dredging and steel sheet pile corrosion protection.


ASCE Subject Headings:
Aquifers
Cellular structures
Cofferdams
Compacted soils
Corrosion
Dewatering
Pressure
Steel piles
Structural design