| 摘要 |
<p>The invention relates to a drag head of a trailing suction hopper dredger. The drag head comprises a rotatable visor (2) connected to a suction pipe (1) for discharging soil via the suction opening (15) of the visor, wherein the visor is provided with a catching construction (20) for undesirable objects. The catching construction closes the suction opening except for passage openings (21), wherein at least a number of passage openings have a variable passage area. The invention also relates to a method for breaking up and/or dredging at least partially hard grounds under water using a trailing suction hopper dredger equipped with a drag head.</p> |
