Ornautal Bridge

The bridge structure K42-2 bridge over the Ornautal is being built as part of the 4-lane new construction of the A 94 motorway – project sections PA 02 and 03 – from Pastetten to Heldenstein. The structure consists of two substructures, each accommodating one directional lane of the A94. The structure is 380 m long
and has 8 fields with spans of 37.0 m – 6 x 47.0 m – 37.0 m.
The superstructure cross-section consists of a single-cell hollow box cross-section for each superstructure with a width of the roadway slab between the railings of 14.80 m and a width at the lower edge of 6.16 m. In the longitudinal direction, the superstructure is prestressed in composite construction by primary tendons guided internally in the roadway and bottom slab and external secondary tendons guided in the hollow box.
The superstructures are manufactured by incremental launching in 2 x 15 construction phases, starting with superstructure South. The incremental launching system is arranged behind the western abutment axis 10. The superstructure is concreted in two sections in the production facility, first the bottom slab and webs, then the roadway slab after approx. 3 – 4 days.
In plan, the roadway gradient runs without curvature (R ĺ) and the crossing angle is 100 gon. In elevation, the gradient runs in the structure area at a longitudinal slope of 1.2%. The roadway slab is constructed with a constant cross slope of 2.5%. The solid abutments (raised in axis 10 in the newly poured BAB dam) and the piers, which are up to approx. 35 m high, are deep-founded by means of large bored piles.