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Tender description :
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Tenders are invited for: Bern node program, as25 wankdorf unbundling (wkd) as25 wankdorf: aarestollen For the realization of the project as25 unbundling wankdorf (wkd), los aarestollen, the work to create a drainage system between the Ostermundigen train station and Wankdorf with discharge into the Aare must be carried out. The following work and services must be carried out (the list is not exhaustive):
- construction site facilities, including new construction and dismantling of all used installation areas, construction and access roads and temporary structures;
- Creation of access shaft, access tunnel including the associated sprouted ruhl wall, excavation of the bored pile wall in the area of the starting shaft (SSAS). The excavation pit securing of the vertical shaft and the secant bored pile wall itself are not part of this tender;
- Project planning / dimensioning and creation of a provisional protective structure including the associated foundation for the factory line passerelle, including relocation of affected factory lines;
- project planning / dimensioning and creation of a provisional access platform IP 9.1 at the Papiermuhlestrasse bridge for the logistics to the SSAS;
- Execution of the drainage pipe (aarestollen aast) with o 2.4m between the starting shaft and the outlet structure using pressure drilling, approx. 725m, including injection body;
- Construction of the outlet structure, including excavation pit with passive anchors and pipeline construction into the Aare (abas);
- execution of the unification building; Securing the excavation pit is not part of the service (VSRB);
- Creation of the drainage pipe between the unification structure and the crash chamber using pressure drillings with a diameter of 2.4m, approx. 700m (trst transport tunnel). The fall chamber (excavation and structure) is not part of the service;
- testing, commissioning, connection and similar services. Submission of tender: November 3, 2026, 11:59 p.m
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