e-mosty September 2018 Vessels and Equipment Used for Bridge Construction | Page 51

VESSELS AND MARITIME EQUIPMENT
USED FOR CONSTRUCTION OF
OSMANGAZI BRIDGE
Abstract Introduction
The Osmangazi Bridge in Turkey is the fourth longest
span suspension bridge in the world, with a main span of
1550m. The bridge and the first phase of the 409-
kilometer-long tolled motorway between Gebze and
İzmir it forms part of were opened to traffic on 30 th June,
2016. The Osmangazi Bridge is situated in the East of the
Marmara Sea, to the West of İzmit and around 50 km (31
mi) to the Southeast of Istanbul. The bridge forms a part
of the Gebze-İzmir motorway and bridges the İzmit bay in
direction North-South shown in Figure 2.
During construction of Osmangazi Bridge, EPC Contractor
IHI-ITOCHU Consortium self performed superstructure
erection using marine vessels directly hired from Boscalis
(sheerleg cranes: Taklift 6 and Taklift 7), ÇİMTAŞ (barge
name: GMK-1 ), CIMOLAI (barge name: Archimedes) and
ARAS Marine (barges: Sun Rise and Ayyıldız).
Turkish contractor STFA Construction worked as a
subcontractor
to
IHI-ITOCHU
Consortium
for
substructure works including: dredging of tower
foundations, driving of inclusion piles for soil
improvement under foundations, laying and leveling of
granular material below tower foundations, preparation
of caissons and towing and sinking of caissons.
This paper describes the marine vessels used during
construction of the bridge to achieve tight schedule.
↑ Figure 1: Location of the bridge on the map
↗ Figure 2: Location of the Osmangazi Bridge and Gebze-Izmir Motorway
3/2018
The new Gebze-Izmir motorway was contracted between
OTOYOL YATIRIM VE ISLETME A.S formed by Nurol,
Ozaltin, Makyol, Astaldi, and Gocay (NOMAYG) and the
General Directorate of Highways, Turkey (KGM) as a
Build-Operate-Transfer (BOT) project for 22 years and 4
months in September 2010. The NOMAYG joint venture
was formed by the same five companies as for OTOYOL,
as single EPC implementing body to construct a 420-
kilometer road including the Osmangazi Bridge.