Description
This infrastructure is part of the high-speed railway line Gasteiz/Vitoria - Bilbao - Donostia/San Sebastian, within the stretch of Arrasate/Mondragon - Elorrio.
The viaduct consists of three decks, one has two lanes of international width (14 m) and two have only one lane, both 8 m wide.
Being 223 m long, each deck is supported on four piers with a maximum height of 41 m and a span between piers of 49 m. A special construction process with less supports on the ground was applied to minimise the environmental impact.
ULMA solution
The box section of the deck, with 3.64 m high, is executed in two stages with ENKOFORM HMK formwork. At first, the bottom slab and the side walls and at second, the top slab and wings.
The formwork is supported on a gantry falsework which consists of H-33 trusses that transfer the loads to a temporary T-500 tower in the middle of the span and to the piers through MT Gantry Brackets.
