Switzerland – Construction work – Programm Knoten Bern, AS25 Entflechtung Wankdorf (WKD) AS25 Wankdorf: Aarestollen

For the implementation of the AS25 Wankdorf (WKD) project, Lot Aarestollen, the following works are to be carried out for the construction of a drainage system between Ostermundigen station and Wankdorf with discharge into the Aare (non-exhaustive list):

- Site installations, including new construction and demolition of all used installation areas, construction and access roads and temporary structures;

- Construction of access shaft, access tunnel including associated sprayed concrete lining, excavation of the bored pile wall in the area of the start shaft (SSAS). The excavation support of the vertical shaft and the intersecting bored pile wall itself are not part of the present tender;

- Design / dimensioning and construction of a temporary protective structure including associated foundation for the workshop passage, including relocation of affected workshop lines;

- Design / dimensioning and construction of a temporary access platform IP 9.1 at the Papiermühlestrasse bridge for logistics to the SSAS;

- Construction of the drainage line (Aarestollen AAST) with Ø 2.4m between the start shaft and the outlet structure by means of pipe jacking, approx. 725 m, including injection body;

- Construction of the outlet structure, including excavation pit with passive anchors as well as pipeline construction into the Aare (ABAS);

- Construction of the junction structure; the excavation support is not part of the service (VSRB);

- Construction of the drainage line between the junction structure and the drop shaft by means of pipe jacking with Ø 2.4m, approx. 700 m (transport tunnel TRST). The drop shaft (excavation and structure) is not part of the service;

- Tests, commissioning, connections and similar services.