DRAG HEAD OF A TRAILING SUCTION HOPPER DREDGER AND METHOD FOR DREDGING USING THIS DRAG HEAD

摘要

The present invention relates to a drag head of a trailing hopper dredger. The drag head comprises a rotatable visor 2 which is connected to a suction pipe 1 for discharging the soil through a suction opening 15 of the visor and the visor is connected to a catching A catching construction 20 is provided. The catching structure closes the suction opening except for the passage opening 21, and at least a plurality of passage openings has a variable passage area. The present invention also relates to a method of breaking and / or dredging at least partly hard underwater ground using a trailing hopper dredger with a drag head.