By pulling on alternate sides the dredger clears an arc of cut, and then moves forward by pushing against the working spud using a spud carriage. The loosened material then enters the suction mouth, passes through the suction pipe and pump (or pumps) and into the delivery line.Ĭutter suction dredgers operate by swinging about a central working spud using moorings leading from the lower end of the ladder to anchors. This is mounted at the lower end of the ladder used to support the cutter drive and the suction pipe. ![]() The most common method is a rotating cutter the main feature of the cutter suction dredger. When the in-situ material is too compact to be removed by suction action alone, some form of mechanical loosening must be incorporated near the suction mouth. Production is very dependent upon the permeability of the material dredged and is best in clean sands. Known as a deep suction dredger, this type offers the potential to recover fill material from depths up to 100 m. Modern suction dredgers can recover material from great depths and can also extract sand from below a clay overburden. The normal measures of size are the diameter of the discharge pipe, which can vary between 1 mm, or the installed horsepower. Material may alternatively be loaded directly into barges moored alongside. Very long distances can be pumped by the addition of booster pumps in the line. Plain suction dredgers are mainly used to win fill material for reclamation, with the material being placed ashore through a floating pipeline. ![]() While working, a dredger may be held in position by one or more spuds or, in deeper water, by a complex system of moorings. More sophisticated vessels have separate suction and delivery pumps, water jets at the suction inlet and articulated suction pipes. In its most simple form this type consists of a pontoon able to support a pump and suction pipe and to make the connection to the discharge pipe.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |