e-mosty September 2018 Vessels and Equipment Used for Bridge Construction | Page 56

Inclusion piles
A floating grab dredger with 5 – 15 m3 clamshells was
used to dredge the sea bed at the tower caisson
foundation locations.
A hydraulic hammer IHC S 280 was used for driving
inclusion steel piles. The 300 t capacity crawler crane on
the pile driving barge LR 1300 was used to keep piles in
vertical position and lift them from the barge.
Figure 4: Dredging by clamshell equipped floating crane
Two separate crane barges were used (“Doğa-1” and
“Alparslan-2”) for placing the grab dredgers respectively
for the dredging operation of North and South Tower
Foundations.
Figure 5: Loading of inclusion piles to the service
barge from South service jetty
Electric motors with cable winches were fixed at all four
corners of the barges.
Each winch was furnished with 300 - 400m long steel
ropes for mooring at the buoys and precise positioning of
the barge.
The buoys were secured by anchor & chain
combinations. The barges were towed and anchored by
tugboats.
Figure 6: Lifting tool on the barge
Figures 7 and 8: Driving the inclusion piles
3/2018