One of our commitments to environment preservation is to reduce the impact of our construction sites and to design more environment-friendly solutions for our customers, whenever possible.
The seismic design was the major focus of optimization – with seismic devices like Fluid Viscous Dampers and isolation through flexible portal frames at pier top – and a key advantage over the original design.
Moreover, preferring the incremental launching method allowed significant acceleration of construction time, and equipment reuse; hence the launching nose was upgraded from the previous Northern Marmara Highway project including a modification of the 1st segment (3.75m longer), strengthening of the other segments and of connections between 4 segments, and adaptation of the deck-launching nose connection with 12 Freyssibars D66 per main girder. The launching device was adapted to the deck geometry and calculated after measuring the friction coefficient on sliding bearings on a few launching tryouts. On the precast yard, sliding bearings were completely reused and with regards to piers and abutments, bearings were adapted and fitted out with guiding devices to both guide the deck and transversally restrain it during launch and stop phases.