SUCTION HEAD FOR A SEDIMENT VESSEL AND METHOD OF DEPTH DEEP WITH USING SUCH SUCTION HEAD

摘要

1. The suction head (6) of the dredging vessel (1), designed to move in the direction of motion P, comprising a structure (7) located on the bottom side with a suction hole and having a connection for the suction pipe (3) of the dredging vessel (1) and a visor (81) rotatable around a shaft (9) extending across the direction P of movement between the lowered and raised positions, wherein the curved wall (8a) of the visor (81) slides substantially watertight along the wall (7c) of the suction head (6 ), P At the same time, the visor (81) contains on its lower part a toothed beam (10) extending across the direction of motion P and provided with many cutting tools (11) for penetrating into the bottom, and in which the visor (81) contains an opening (15) in its rear a wall (8b) along which the surrounding water can flow into the suction head (6), and this opening (15) can be closed to the surrounding water by a closing element (20) .2. The head according to claim 1, wherein the hole occupies at least 50% of the visor wall area extending from the toothed beam to the curved visor wall. 3. The head according to claim 1 or 2, in which the hole extends essentially from the toothed beam to the curved wall of the visor. 4. The head according to claim 1 or 2, in which the hole extends across the direction P of movement at least 80% of the width of the suction head. The head according to claim 1 or 2, in which the closure element comprises a valve configured to slide relative to the visor wall between a position in which the hole is substantially closed and a position in which the hole is fully or partially open. The head according to claim 3, in which the closing element contains a valve made with the possibility of how