Work Vessels
TOSHO, the World's Largest Grab Dredger
TOSHO, the world's largest 200m3 grab capacity dredger, recognized by Guinness Book, was completed by Sumitomo Heavy Industries, Ltd. and delivered to Kabushiki Kaisha Kojimagumi in May 1995.
Features
1. Counterweight-balanced and hydraulic-operated mechanism, which is energy saving and patented by Kojimagumi, mainly functions to balance the weight [abt. 370t] of grab bucket with counterweight.
2. Simplified dredging gear reduces consumable parts and maintenance cost.
3. Strong hydraulic seizing power with the grab bucket dredges hard soil and minimizes roughness of seabed.
4. Mooring system without an anchor-chain but a walking spud, patented by Kojimagumi, eliminates operating of any anchor.
5. Operation system of the dredger including operating winches and spud winches are controlled from a remote operation room in a unified Way.
6. Environment-friendly managing system realizes highly efficient and precise dredging.
PRINCIPAL PARTICULARS
Length(o.a.)……………100.0m
Breadth(mld.)……………36.00m
Depth(mld.)……………6.0m
Draft(mld.)……………3.6m
Main engine……………Diesel 3,800PS×720rpm×3 (Main Generator Engine) 2,400kW×AC3,300V×3 (Main Generator)
……………Diesel 205PS×1,200rpm×1 (Aux. Generator Engine) 135kW×AC450V×1 (Aux. Generator)
Complement……………16
Dredging gear……………Max. hoisting capacity 690tons
Max.dredging capacity……………6,000m3/h
Max.dredging depth……………-30m
Hoisting Speed……………66〜46m/min.
Lowering Speed……………66m/min.
Slewing Speed……………0.6rpm
Grab bucket
Operating method……………Electric-Powered Hydraulics
Capacity……………200m3
Weight……………370tons
