| 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 (2), WHEREIN THE VISOR (2) IS PROVIDED WITH A CATCHING CONSTRUCTION (20) FOR UNDESIRABLE OBJECTS. THE CATCHING CONSTRUCTION (20) CLOSES THE SUCTION OPENING (15) EXCEPT FOR PASSAGE OPENINGS (21), WHEREIN AT LEAST A NUMBER OF PASSAGE OPENINGS (21) 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. FIG 1.</p> |
