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Contractors World International

Featuring a total of 17 partners from 9 EU countries,

¡VAMOS! seeks to address this situation by making pos-

sible the extraction of European mineral deposits from in-

land water-bearing areas. To reach this aim, the partners

are developing an innovative system whereby a remotely

operated mining vehicle is launched from a waterborne

carriage. The underwater mining equipment is operated

without any effect on groundwater levels. Damen Dredg-

ing Equipment, the dredging tools specialist within the

Damen Shipyards Group, as one of the 17 ¡VAMOS! part-

ners, has the responsibility of developing and supplying

the slurry circuitry components and the launch and recov-

ery system for the mining vehicle.

Viable Alternative Mining Operating System

Damen DOP250 Dredge Pumps

On Brazilian Harbour

Damen delivered two

complete DOP pack-

ages to Acciona In-

fraestructuras, S.A., a

Spanish construction

company. The DOP

submersible dredge

pumps are being used

in a large harbour

construction project

in Brazil. The DOP

pumps empty concrete

caissons to be able to

reposition these as a

breakwater.

This is a job per-

fectly suited to the

DOP, which fits into

confined spaces.

The harbour

construction project,

at Sao Joao de Barra,

150 miles North

of Rio de Janeiro,

started a few years

ago. Acciona was

awarded the contract

for the engineering,

design and construc-

tion of two artificial

breakwaters.

Acciona decided

to use its pioneering

system of concrete

caissons built in an

auxiliary dock. Five

of these sand-filled

caissons now have

to be emptied to be

moved to their final position, together with another 37

caissons which have already been positioned.

Damen has delivered two DOP packages, which both

include a DOP submersible dredge pump, type DOP250,

a 403 kW diesel hydraulic power pack, a separate diesel

driven jetwater pump feeding the dredge pump’s suction

head plus a number of hoses, connections and spares.

The DOP is connected to a crane.

Each DOP250 has a mixture capacity of 1,250 m³/h,

and is used to empty each partition of the caisson. The

sand is put to good use as it is pumped to a nearby beach.

The DOP submersible dredge pumps arrived on site

mid-January. A Damen Field Service Engineer assisted dur-

ing the startup and instructed the crew.

All caissons were finished and emptied by the middle

of May. Then Acciona finished the repositioning of the

caissons and completed the breakwater construction.

Damen

Page 21

Contractors World International Vol 6 No 4