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

Chapter 5 Other Technologies Reviewed