e-mosty September 2018 Vessels and Equipment Used for Bridge Construction | Page 52

Figure 3 : Navigational arrengements around Osmangazi Bridge location
Summary
Vessels and marine equipment were carefully studied
and selected to achieve the tight schedule for
construction of the Osmangazi Bridge. The main selection
parameters were as follows:
 Conditions of the job site, in particular navigational
requirements including depth, speed and other
constraints
 Size and weight of modules transported and installed
 Method of transportation and installation of modules
Prefabricated offices were installed on temporary
working platforms at each tower and at “Yaşarsan” and
“Gölcük” shipyards.
All vessels were equipped with life saving and health
safety and environmental (HSE) equipments.
Selected vessels and equipment were generally used as
planned, hovewer several actions were necessary to
compansate for time lost due to poor weather conditions
during construction.
Although the construction site in İzmit Bay was to some
extent protected from adverse effects of the sea; wave
heights and wind speeds imposed limitations, especially
on lifting operations using floating cranes.
The width and location of the navigational channel
changed several times during construction activities, in
coordination with the Harbor Master and other maritime
authorities.
Self propelled vessels with dynamic positioning systems
were used to erect the tower and deck segments. Non
self propelled barges were towed by tug boats and used
in secondary works like transportation of temporary
elements.
3/2018
Figure 4 : Offices on South Tower working platform