After a long design and approval process, the construction works for the first phase of the A26 started in 2019. The A26 not only relieves the central part of the road network of the city of Linz but also allows the river Danube to be crossed by means of a bridge: a 300 m long bridge, anchored in the rock slopes forming the banks of the Danube. The elements of the first phase are the Danube bridge and the two underground motorway junctions, Danube North and South, with excavation cross‐sections of up to 400 m2 and the tight radii of the motorway on‐ramps. Besides these conditions, urban planning requirements such as the protection of residents against immissions caused by noise and vibration, and the increased negative impacts resulting from the traffic during construction have an effect on the construction works. The excavated material from the tunnel is transported off site by ship. The existing rock mass requires excavation by means of the drill‐and‐blast method. The project‐specific boundary conditions such as the high number of portals, the noise‐reflecting effect of the “Danube gorge” and the low overburden require substantial measures to limit and monitor the immissions.
As part of the project "PPP Ostregion Paket 1", a tunnelling project is being constructed on the basis of a performance specification for the first time in Austria, with the entire geological risk being borne by the contractor. The two-tube Tradenberg tunnel, each tube carrying one traffic direction, is in the S1-West section of the 51 km long Y-Trasse to be constructed by the consortium Bonaventura. The overall length of the tunnel is 2,457 m or 2,423.5 m, of which 1,403.6 m or 1,359 m are to be mined underground. The entire section is to open for traffic in early 2010. The contract model has the effect of transferring competence to the contractor. This opens a wide range of organisational possibilities for the construction consortium, but accompanied by an enormous increase in responsibility and commercial risk.
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