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“DEREVENK VIADUCT” opened to traffic...
A Balanced Cantilever Project in Kayseri…
Derevenk Viaduct, which is the 2nd part of Kayseri South Ring Road and connects Talas and Mimar Sinan, was built using the Balanced Cantilever Method (BCM) that has been lately the most preferred method among other available special bridge methods in our country. BCM is especially preferred in cases where there are challenging deep valley transitions, high and variable water levels in the middle of the valley, large abutment heights and very wide spans (>150 m). In this sense, Derevenk Viaduct is one of best examples where BCM has been the best choice.
The viaduct has been planned to reduce the land route distance to Kayseri city center from Malatya direction to only 3.5 km, in contrast to the previous distance of 20 km.
In this project, Freysaş undertook the supply of post-tensioning materials, BCM applications, the manufacture, supply and installation of sheaths, and the supply and operation of form traveller.
On a side note, it is of key importance that in the balanced cantilever method great significance is attached to design stages (anchor type selection, section geometry), that the manufacturing process needs essentially be well-planned and progress without interruption, and also, that the form traveller must be made subject to a load test (133%) before the manufactures are commenced. In this method, owing to the formation of major cantilever loads, the system must be closed down at certain intervals to apply continuity tensioning, and a casting curve analysis must be carried out meanwhile at every stage, which are both indispensable musts of BCM.