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Gülsuyu Maltepe Bridge, Istanbul, Turkey
Ideal combination of light and heavy shoring
The new feeder road crosses the E5 city express way unintersected at a 70° angle. This intersection, in the Istanbul suburb of Maltepe, is one of the most heavily congested road junctions found in the Turkish city on the Bosphorus. The required doublespan bridge, complete with a massive slab cross-section, has two individual 20.70 m spans and the 28.80 m wide road features three lanes in both driving directions.
The technically challenging task now consisted of completing the construction within the shortest possible time in normal busy traffic conditions and without having to close off the roads. Therefore, two lanes in each driving direction were to be kept free on the expressway. This construction method was used for the first time in Turkey for this project.
For realizing the bridge structure, PERI engineers combined light and heavy shoring with PERI system components. The frame construction formwork of the side sections in the area of the external and centre walls could be directly supported by type-tested PD 8 shoring towers. The field loads from the 0.80 m up to 1.06 m thick superstructure were carried using HEB steel girders supplied by the contractors and transferred through the main beam area consisting of HD 200 shoring. Thereby, 10.00 m wide and 4.50 m high passages were created ensuring a free flow of traffi c on each side. In the heavy peak periods, these were used to some extent as 3-lane transits.
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| PERI Systems In Use |
HD 200 Heavy Duty Prop
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Şafak Karataş
Site Manager
“It was a tremendous challenge to concrete for the first time in Turkey a cast-inplace bridge with roads still open to traffic. However, with the PERI formwork solution and support, we were able to maintain the tight construction schedule.”
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PERI Handbook 2008
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