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Doka Makes Its Mark In Turkey On The Kömürhan Bridge

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Reading Time: 3 minutes

Constructed over the Karakaya Dam Lake, the Kömürhan Bridge will soon forge part of the Malatya-Elazig State highway in Eastern Turkey. Measuring 600 metres in length, the bridge features a cable-stayed design with a single pylon, which stands at 165 m in height.

This special type of bridge, which is the fourth single pylon cable-stayed bridge in the world, will also serve an important regional role as a logistics corridor, not only connecting Malatya and Elazığ, but also serving as a strategic crossing for the 16 provinces of Eastern Anatolia.

Located approximately 700 kilometres east of the Turkish capital of Ankara and 400 kilometres north of the Syrian border lies the province of Malatya, a region famed for its apricots and now the tallest pylon in the country. Standing at a height of 168.5 metres, the ‘Y’ shaped reinforced concrete tower is the centrepiece of the new Kömürhan Bridge, a suspension structure traversing the Fırat River and the Malatya-Elazığ regional borders.

Stretching just over half a kilometre at 660 metres the bridge has an edge opening of 180 metres, a middle opening of 380 metres and a width of 24 metres. The deck cross-section will be orthotropic steel, while the superstructure of the bridge will be connected to the pylon with 42 tensioned cables. In context of the wider project, it is part of a 5,225 metres four-lane highway that includes a 120-metre viaduct and a 2,400 metres tunnel, providing passage to the Karakaya Dam a few kilometres to the south.

The existing old bridge and crookedly connected roads will be preserved. The new bridge and the tunnel will be developed next to the existing route. It is planned that the Kömürhan Bridge will be completed in July 2020.

Working under the joint venture of Doğuş and Gülsan, Doka Turkey was awarded the contract to design and supervise the execution of formwork, which commenced in August 2017. With the bridge scheduled to open in 2020, we spoke with project manager, Mr. Taha Özdilek, who commented on his experience with Doka Turkey.

“Safety was our main priority on this project and Doka has maintained an excellent track record where this is concerned. Most of my team were accustomed with Doka’s products and systems and knew that the solution presented, and the site support received would add much value. Our team was also familiar with Doka’s solution for a similar project (Nissibi Bridge), which was delivered in 2015 and therefore knew they would be well suited for the job.”

In terms of the practical formwork solution, the major challenge was focused on the pylon, specifically its unusual shape. Doka’s Automatic Climbing Formwork SKE 50 was used on the upper single core column of the pylon, while a specially adapted double set was used on the lower half with bespoke solutions created at junction points to maintain the highest standards of quality and safety.

Large-area formwork Top 50 was used for the pylon with Doka D2/D3 and Load-bearing Towers Staxo 100 shoring systems for the approaching viaduct. While a tower and mobile crane were used for the pylon and viaduct respectively, the formwork solution was otherwise self-sufficient and delivered its portion of the project safely, on time and on budget.

Build Safely with Safe Formwork Systems

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Reading Time: 2 minutesInvestments in safety soon deliver demonstrable benefit to every project. Greater cost-efficiency, a reduced risk of accidents and enhanced employee motivation are just some of the advantages of implementing a professional safety concept on the site. When it comes to safety, Doka takes a holistic, A-to-Z approach that runs all the way from product development to safety consulting, and to its extensive range of products and services.

Study after study has shown that on safe jobsites, people work faster. Quite apart from human suffering and loss of value-creation, accidents also cause heavy costs ranging from sick-leave to legal consequences which may even include work on the site being stopped altogether. The old objection to installing safety systems is that it “means more work”; Doka has made this objection ever less relevant by developing quick and easy-to-operate safety innovations for every type of forming assignment.

A holistic understanding of safety begins right from when formwork systems are still under development. Safety, ease of handling and ergonomic design are among the key characteristics of Doka products. The use of high-grade materials for all formwork components not only makes them last longer, it makes them safer, too.

Systematic safety
Doka systems unite speed, safety and cost effectiveness on the site. For a high standard of safety, Doka offers complete systems for floor, wall or column formwork. These come with ‘on-board’ protection features such as ladderways or working platforms with integral edge protection. Pre-assembly of the protective elements at ground level, and easy-to-use connector components that allow the formwork and platform to be repositioned in one piece, make for swift, safe work on the site.

Safe, from the planning through until completion
As early as in the planning phase, Doka supports its customers with professional consulting with safety issues. In-depth analysis of the initial situation provides the basis for individualised solutions in which suitable products are incorporated into the formwork planning right from the start. Efficient usage of formwork systems is achieved not only by the features themselves, but even more so by using their components correctly. This is why high-quality documentation such as formwork utilisation plans, instruction manuals and safety data sheets are such an important basis for a safe site. Services such as practical, relevant training offerings, Formwork Instructors and fielding technical advisers facilitate a high level of safety on-site.

New 166 m Office Tower Will Be The Second-Tallest Building In Turin

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Reading Time: 3 minutesWorld-famous Italian star architect Renzo Piano is the name behind another new urban landmark in Turin, this time a sophisticated highrise project in the city’s San Paolo district. The client is the banking group Intesa Sanpaolo SpA (BISP), whose around 100,000 staff and over 5000 branches make it one of the largest in the eurozone. The new building will fulfil very exacting structural and environmental standards. Rising to a height of 166 m, it will also take up a visually pre-eminent position in the Turin skyline. Especially with its automatic climbing equipment, Doka is helping this structure to be built economically and to high quality specifications.

A prestige project in the highrise sector: once completed, the Torre Intesa Sanpaolo skyscraper in Turin will house the new headquarters of the Intesa Sanpaolo SpA banking group.

A prestige project in the highrise sector: once completed, the Torre Intesa Sanpaolo skyscraper in Turin will house the new headquarters of the Intesa Sanpaolo SpA banking group.

Turin, Italy – On completion, the Torre Intesa Sanpaolo will offer more than 110,000 m² of useable floor-space spread over 44 storeys, with most of it being used to accommodate 2000 office workplaces. Other parts of the building will be put to various interesting uses for the Turinese public, including a conference and event venue, exhibition spaces, a panorama restaurant and a bar with a viewing terrace. Visitors will be whisked upwards by a free-standing panoramic lift.

To achieve high sustainability performance for the structure, the architects are implementing a ‘Green Building Challenge’ energy concept which will give the building an Energy Class A rating under Italian regulations. To this end, the eastern and western facades of the building will be enveloped in a double glass ‘skin’ with movable louvres that can assist with temperature regulation by being opened or closed as needed. Furthermore, ventilated ceilings are to be installed throughout the building. The southern facade carries 1600 m² of photovoltaic panelling for generating electricity. Geothermal heat will also be tapped, to lower the building’s external energy-sourcing needs.

Complex construction operations

Construction works have been entrusted to a consortium formed by Italian general contracting group Rizzani de Eccher SpA, acting as leader, and Implenia AG of Switzerland. On a site as large and complex as this – building the 166 m tower with three CIP concrete cores, composite floor slabs (steel girders plus pre-cast concrete members), shafts for 25 lifts, energy-saving HVAC systems – it is crucially important for the formwork systems used to be efficient, high-performing and reliable. In addition, on this site a substantial volume of structural steel works had to be optimally integrated into the construction workflow: to provide work-decks for pre-assembling the steelwork for the floor slabs, Doka supplied a large platform with a high load capacity (5.0 kN/m²). This platform was suspended on high-load cones anchored in the rising concrete wall, doing away with the need for labour-intensive and time-consuming shoring scaffolds.

Safe, streamlined climbing

To build this 44-storey office tower, it was important to deploy fast, efficient yet highly flexible formwork systems that could be quickly adapted to the changing circumstances encountered in different workflows. Another requirement was that the forming operations should need as little craneage as possible, because this had to be kept available for the extensive structural steel works. For this reason, the contracting consortium decided to construct the rising reinforced-concrete walls using the ‘SKE50 plus’ and ‘SKE100 plus’ self-climbing systems. The concrete placing booms are always raised cranelessly along with the formwork whenever this is automatically ‘climbed’. The fact that the entire unit is firmly anchored to the concrete construction at all times during the climbing operation ensures constant cycle times throughout the entire course of construction – regardless of the weather conditions: With the SKE system, climbing operations can continue unhindered up to a maximum wind speed of 72 km/h and a structure inclination of up to +/- 15 °.

Dokaflex props and formwork beams H20 were used to shore the composite floor slabs during construction. In areas with very high room heights, the slabs were shored with the Load-bearing tower Staxo 100 system. The resulting cycle time for all the operations on one storey was ten days.

Ever since work started on this site, a Doka project manager has been on hand to provide formwork-technology oversight. Ciro Menna of Doka Italia co-ordinates the planning and deliveries, and acts as the interface to all the decision-makers on the site: “Our formwork solution has proved itself with flying colours, in terms of both performance and safety, and has helped to optimise the sequencing of all site operations”, notes Menna, summing up his experience on this build.