Drag head of a trailing suction hopper dredger and method for dredging using this drag head
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United States of America Patent
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Oct 16, 2012
Grant Date -
Dec 2, 2010
app pub date -
Oct 31, 2008
filing date -
Nov 29, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A drag head of a trailing suction hopper dredger. The drag head comprises a rotatable visor connected to a suction pipe for discharging soil via the suction opening of the visor, wherein the visor is provided with a catching construction for undesirable objects. The catching construction closes the suction opening except for passage openings, wherein at least a number of passage openings have a variable passage area. 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.
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