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DE-Lecture04-Types-of-Dredges

DE-Lecture04-Types-of-Dredges - Dredging Dredging...

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Dredging Engineering Lecture 04 Types of Dredges L. Prieto-Portar 2010
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Common Dredges: 1) Trailing suction hopper dredgers 2) Bed leveler dredgers 3) Water injection dredgers 4) Stationary suction dredgers 5) Cutter suction dredgers 6) Dustpan dredgers 7) Grab pontoon dredgers 8) Grab hopper dredgers 9) Hydraulic excavator dredgers 10) Dipper dredgers 11) Bucket dredgers Special Dredges: 12) Jet pump dredgers 13) Air lift dredgers 14) Positive Displacement Pumps 15) Pneumatic Dredgers 16) Amphibious Dredgers 17) Scraper Dredgers
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1) Trailing suction hopper dredgers. “Trailer” dredgers are used for coastal and deep sea work. They load the material while still moving ahead through centrifugal pumps. Then they store the material onboard in large hoppers, and unload either through (1) bottom discharge doors, or (2) by “rainbowing” the discharge directly to a shore placement area. They range in hopper size from 750 to 17,500 m 3 in capacity. Advantages: 1) Relatively immune to weather and sea conditions; 2) Operate independently of auxiliary equipment; 3) Minimal obstruction to commercial shipping; 4) Transport material over long distances; 5) High production rates; 6) Simple mobilization; Disadvantages: 1) Unable to dredge strong materials; 2) Unable to work in restricted areas; 3) Dilute the materials during loading;
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The main features of a typical trailing suction hopper dredge.
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Royal Boskalis’ trailing suction hopper dredge “Cornelis Zanen”.
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Jan de Nul’s “J. F. J. deNul” is a trailing hopper dredge with a 11,750 m 3 hopper capacity. The dredge is “rainbowing” its charge on to the shore for the runways of Hong Kong’s Chek Lap Kok airport.
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The Marieke is a trailing suction hopper dredger that belongs to DEME of Belgium. It was built by IHC Holland Dredgers BV to a length of 97.5 m, beam of 21.6 m, draught of 7.1 m. The hopper has a 5,600 m 3 capacity. The suction tube is 1000 mm in diameter, and it can dredge to 33 m depths.
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The Marieke tests its discharge pumps on its first job in the Netherlands. It was built at IHC’s Sliedrecht shipyard in 2007.
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This suction pipe of a trailing suction hopper dredge is fitted with a submerged pump in order to boost its efficiency; normal depth are 35 m, but this pump permits depths up to 80 m.
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Submerged electrical suction pumps.
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Dustpan dredging
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Two trailer suction dredges linked to trench for a gas pipe in the Wadden Sea.
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Maximum dredging depth and pump power for trailing suction hopper dredges.
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Dredge’s laden speed, maximum draft and suction pipe diameter for trailing suction hopper dredges.
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  • Summer '11
  • Prieto-Portar
  • Dredging, suction hopper dredgers, suction hopper dredge, Bill T. Dutra, suction dredges, suction hopper dredges

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