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Large-Scale and Economic Dredging by World's Largest Grab Dredger
Category:
Dredge Plant
The grab dredger "Tosho" has a dredging capacity of 6,000 m3/hr, equipped with the world's
Description:
largest grab bucket (200 m3 capacity). The large dredger provides a solution to large-scale and
economical dredging. It also minimizes pollution.
Large capacity and energy savings are realized by the self-contained electro-hydraulic grab
bucket and the counterweight-balanced lifting/lowering system. The required power for dredging
is roughly 60 percent of that for traditional bucket dredges. The dredge has a traveling spud
system.
Features that make this dredge successful include:
1) Counterweight balance and hydraulic operation, which mainly function to balance the grab
bucket weight with counterweight.
2) Simplified dredging gear, which reduces consumable parts and maintenance costs.
3) Power assist grab bucket for dredging hard soil.
4) Traveling mooring spud system to eliminate anchor work.
5) Operation system that includes remote-controlled life and spud winches.
Reviewer:
C. Woolley
Company / Organization(s):
Projects Completed:
Nagoya Bay, Aichi Prefecture, Deepening
Location:
Nagoya Bay, Japan
Removal of 5,000,000 m3
Comments:
Information Sources:
Literature:
Title:
"Large Scale & Economic Dredging By World's Largest Grab Dredger
"Tosho""
Author:
Matsui, Narita, Katase
Month:
June
Year:
1998
LitType:
Report/Proceedings
Publisher:
WODCON XV, Las Vegas
Page:
177
75
Chapter 5 Other Technologies Reviewed

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