The Canakkale 1915 bridge, which is under construction in North-Western Turkey, is one of these wonders. Strictly speaking, it is being constructed as the World’s longest suspension bridge with a total length of 4,608 meters, including the approach viaducts. With a record of 128,000 tons of steel deployed, the scale of the construction is immense for a single project. And amidst fierce competition for the contract, the winner who succeeded in landing the orders was POSCO. 

POSCO provided steel plates for the tower structures and the bridge deck, along with steel wire rods for the cabling system of the Canakkale 1915 bridge. See the details of this “All POSCO Steel” bridge as  POSCO Newsroom presents worldsteel, “World’s Longest Suspension Bridge Will Connect Europe and Asia.”

Scheduled to open in 2023, the Canakkale 1915 bridge will be a steel-built infrastructure first, spanning the Dardanelles strait that separates the European and Asian continents.

As the Turkish government undertakes an ambitious infrastructure investment programme, parts of the country are being transformed by new mega tunnels and bridges. The Canakkale 1915 bridge is one such project, conceived to open as a tribute to mark 100 years of the modern Turkish republic.

The North Western region of Turkey functions as an important connection between Europe and Asia, with ground traffic currently funnelling through the narrow stretch of land surrounding Istanbul which leads on to the borders of Greece and Bulgaria.

With the span between its two towers sitting at 2,023 metres, the Canakkale 1915 is set to become the world’s longest suspension bridge

Turkey’s rising economic growth as a result of agricultural expansion, increased transit links and the country’s growing popularity as a tourist destination, has led to serious congestion around its major cities.

The growing struggle facing the existing transport system has caused the government to announce its Vision 2023 programme, which aims to boost capacity across road, rail and sea networks.

l A Towering Achievement

The suspension bridge is being constructed in the north west Turkish province of Canakkale and will service the 320km-long Kınalı-Tekirdağ-Çanakkale-Balıkesir motorway which will connect the Anatolian peninsula and East Thrace once completed. Currently, this journey requires a 30-minute ferry ride, but once the bridge is in place this will be reduced to a short drive of just 10 minutes

With the span between its two towers sitting at 2,023 metres, the Canakkale 1915 is set to become the world’s longest suspension bridge, outstripping Japan’s Akashi Kaikyō bridge by 32 metres. Its full length, including the approach viaducts, will stretch to 4,608 metres

Once completed, the Canakkale bridge will have seen 128,000 tonnes of steel deployed in its construction

Formed of a reinforced concrete deck, the bridge structure supporting the road surface will be underpinned by a pair of shear-connected longitudinal steel box beams. These will in turn be interconnected by steel crossbeams that sit on external cantilevers.

The 45-metre wide deck is expected to handle large amounts of commercial and private traffic, with three lanes moving in both directions and maintenance walkways on either side, contributing significantly to the socio-economic development of the region.

The towers, which sit on a pair of steel platforms each mounted just above sea level on massive 65,000-tonne submerged caissons, will make the bridge the fourth tallest in the world, with its striking design stretching 318 metres into the sky.

l A Partnership Forged in Steel

Once completed, the Canakkale bridge will have seen 128,000 tonnes of steel deployed in its construction, a mammoth undertaking for a single company.

As such, the steel elements of the bridge represent a strategic partnership between Turkish and South Korean suppliers, with Turkey’s Çimtaş steel and POSCO agreeing to supply 35,000 tonnes of heavy steel plate for the tower structures, cabling systems and road surface.

The partnership is also supplying 52,000 tonnes of steel plate for the bridge deck and 41,000 tonnes of steel wire rods for the suspension system that will support it.

Unusually, the Canakkale is being run as a ‘design-build’ project. Typically for bridge construction, the design is completed before contractors and suppliers are selected. For this project, however, construction and design take place concurrently, requiring coordination between the architect and contractors from very early on.

Representing a $3bn investment, this record-breaking, steel-built suspension bridge is set to be transformative for the region’s transport systems, with socio-economic knock-on effects for the whole of Turkey and Eastern Europe.

Images: Arup, iStock, Berkaysnklf 

The original content published on the worldsteel’s ‘Our Stories’ section is available at: https://stories.worldsteel.org/infrastructure/worlds-longest-suspension-bridge-europe-asia-canakkale-1915/

▲ Aerial view of WEST GATE TUNNEL, Melbourne, Australia. Nine bridges that connect each section of the city will be newly constructed.(Image source: WEST GATE TUNNEL website)

That’s why the WEST GATE TUNNEL project started. Previously, for a single day, 200,000 cars had to rely solely on the WEST GATE Bridge to enter the city center from Melbourne’s harbor. The new project is a large-scale infrastructure project that builds nine new bridges and one twin tunnel to solve this problem. It runs about 5 km from Melbourne to Docklands, with construction in progress beginning in 2018 and estimated to be completed by 2022.

Not many people would know that the company behind connecting the bridges of Australia is a Korean company from more than 8,000km away.

l Melbourne’s Bridge Created With Korean Steel!

POSCO is one of the top three domestic companies in annual sales (FY2018). It is not only a Top Player in the domestic market but also a Global Player that exports about 45% of its total sales. POSCO provides all the steel plates for the nine bridges of the WEST GATE TUNNEL project. Of course, winning this project demanded intense work from POSCO’s marketing, production, quality, and research institutes.

First of all, POSCO presented an idea of applying steel products with higher quality and lower cost than the previously requested steel specifications the client. At the same time, POSCO took the lead in bidding with high specs steel that can’t be easily produced by competitors.

POSCO overseas subsidiaries also joined in. POSCO-China took a three to four-hour trip every week to persuade Zhenhua Port Machinery Company Limited (ZPMC). ZPMC is the bridge construction company for this project. To reduce the cost of loading and unloading, POSCO-China suggested utilizing ZPSS’s Zhangjiagang Pier. ZPSS is POSCO’s stainless steel manufacturing subsidiary in China.

At the same time, Pohang Works entered into a “joint operation” to get the ACRS review done within a short time. On the day of the on-site evaluation, all relevant departments cooperated with a 24-hour response system.

Eventually, POSCO was chosen as the supplier of the entire steel plates for the bridges of the WEST GATE TUNNEL project. Steel supply began in July last year and ends in May this year. The WEST GATE TUNNEL project will be a solution to alleviate the troublesome traffic congestions in downtown Melbourne. In addition, almost nine hectares of new open space will be created, with over 14 km of new and upgraded walking and cycling paths. This project is aiming to improve the quality of life for Melbourne citizens — it isn’t just a tunnel and bridge construction project.

l The Longest Suspension Bridge in the World — ‘ALL POSCO STEEL’

POSCO is also a part of the suspension bridges that cuts through straits. Even on the current longest suspension bridge in the world.

The Çanakkale 1915 Bridge is being built in the city of Çanakkale, northwestern Turkey. It is expected to become the longest suspension bridge in the world with a total length of 3,563m and main span distance of 2,023m. In the past, people had to take a boat that came every 30 minutes or so to cross the strait. However, with the bridge completed, it is expected to be a 10-minute drive to reach the other side.

The construction will be finalized by 2023 to celebrate the 100th anniversary of the Republic of Turkey — However, the Turkish Parliament Chairman said it could be completed in 2022, one year ahead of the original plan! The scale for the construction is immense for a single project with a budget of 3 billion dollars, and 128,000 tonnes of steel products. It’s no wonder that leading companies around the globe worked hard to win the contract.

▲ Aerial view of the Çanakkale 1915 Bridge, Turkey. The red tower symbolizes the Turkish flag color. The height of the tower reaches 318m. (Image source: KSCE Journal of Civil Engineering, January 2020)

POSCO was the winner of the intense competition. POSCO succeeded in winning all orders for steel plates and wire rods for the bridge. POSCO’s marketing representative attributed the success to three factors — premium steel supply, solutions to better process steel, and service to ensure perfect quality from production to transportation and storage.

Generally, for a bridge construction project, the construction company, manufacturer, and the steel supplier are determined after the design is completed — like the Australian WEST GATE TUNNEL project mentioned above. However, the case was different for the Çanakkale 1915 Bridge. It was a “Design-Build*” project, meaning that the design and construction were carried out simultaneously. In other words, this project needed a solution for the steel application from the initial design stage. The competition wasn’t about just the price, and non-price competitiveness was the secret. This was, of course, one of POSCO’s strengths.
*A business model in which the architect-contractor cooperates from the design stage before the design is completed. This is different from the general method where construction is progressed after the design is completed.

POSCO actively held solution briefing sessions for local contractors. The key to winning the project was to quickly dig in from the design stage, which was crucial in a “Design-Build” project. POSCO promised the production of wide-ranging materials to minimize local processing costs, welding solutions for steel plates over 100mm thick, and steel storage and inventory management services utilizing POSCO-Turkey Nilufer Processing Center (POSCO-TNPC), an automotive steel processing center in Turkey. Initially, POSCO received an order of 35,000 tons of steel plates for the bridge towers. This later on advanced to a contract of 52,000 tons of steel plates for the decks and 41,000 tons of wire rods — resulting in a build of an ‘All POSCO STEEL’ bridge with a total 128,000 tons of steel.

POSCO’s steel supply for the Çanakkale 1915 Bridge is now nearing its end. It will be finished by April this year. Since its start in 2018, the journey for the project lasted for nearly three years — including the preparation period. However, this is not the end since POSCO’s after-sales service will continue even after the steel supply is complete.

POSCO’s Sang-Il Lee of the Construction Steel Materials Marketing Office, who participated in this project said, “This was a large project that I would never have been able to handle alone. We could win this contract thanks to the many employees who joined and came together. I’m glad to see that POSCO enhanced its status as a global player with this project. I would love to visit and see with my eyes once the Çanakkale 1915 Bridge is complete.”

Bridges could be considered one of the pinnacles of modern civilization. Looking at a far stretched bridge might make one marvel, “Wow, how did people build that? Human technology is amazing.” The ‘people’ who make this amazing structure isn’t far away. Even today, the bridges connecting the world are supported by POSCO’s steel.

On May 9th in Turkey, POSCO had an official contract of MOU with CIMTAS STEEL for the supply of 35,000 tons of thick plates for towers on the Çanakkale 1915 project.

POSCO will be the main supplier for the towers of Çanakkale 1915 Bridge

POSCO finalized the contract with CIMTAS STEEL, the biggest steelmaker in Turkey, to supply 35,000 tons of steel plates as tower material of the Çanakkale 1915 Bridge.

Çanakkale 1915 Bridge will be constructed at the western end of the Sea of Marmara connecting Gelibolu and Lapseki in Çanakkale province. The construction will be finalized by 2023 to celebrate the 100th anniversary of Republic of Turkey.

What makes the bridge special is the distance between the towers of the bridge. Currently, the longest span is the Akashi-Kaikyo Bridge in Kobe which is 1,991m in distance between the towers. However, Çanakkale 1915 Bridge is ready to break the record as the constructed bridge span is 2,023m.

POSCO’s advanced thick plates will be used for manufacturing towers of the bridge

Building a strategic partnership

With POSCO’s wide range of solutions that can save the time of welding process, construction period and adopting solution that can supply special steel plate which is more than 100mm thick will be provided for the project. Also, POSCO’s advanced transport and storage solution will ensure a safe and sound supply.

In the MOU, POSCO and CIMTAS has agreed to establish global partnership by sharing advanced steel product, solutions and projects.

Besides, POSCO is also preparing to introduce the solutions for the wire rods for cable, thick plates for deck that support the road. POSCO expects that these efforts will bring positive impact on global status of POSCO such as strengthening relationship with global companies or identifiying of new business.