Mooring of Floating Dock under Hostile Wheather Conditions at the Port of Hirara

Abstract

Caissons for outer breakwater of the port of Hirara are being fabricated by use of floating docks (hereafter FD). FDs used to left-lettuge to Okinawa island or Ishigaki island when a typhoon seemed toattack the Miyako island, and the fabrication work ought to be interruped and postponed for one or two weeks for every typhoon. If it is possible to moor FDs during typhoons are influening the Miyako island, the days of interruption must be shorten. Then, the examination was made on the safety of mooring of a FD during typhoon with numerical simulation method then 4, 800 ton FD has beenmoored safely during typhoon since1989. In 1990, it was planned to replace the 4, 800 ton FD by 6, 000 ton FD, theleft-lettore the examination was made on the safety of mooring of 6, 000 ton FD with the same manner. Then the 6, 000 ton FD has been moored since June, 1990. Several typhoons attacked the Miyako island in 1990, however, the FD was moored safely. Motions of the FD were measured during typhoons.
This paper describes the procedure and the results of the examination on the safety of mooring of 6, 000 ton FD and the results of the observation.