MP-130008 N02 SBT, 2nd repair / OBL BSA+Construction Part I

Service 11/11/2026 | The Seelisberg Tunnel (SBT) on the N02 national road is a strategically important structure on the Gotthard axis. After a good four decades of operation, an initial repair (securing the stability of the vault, 2009/2010) and measures to ensure the operational safety of the operating and safety equipment (BSA, 2014-2017), further measures are needed to be implemented in a second repair. The critical part of the extinguishing water pipe in the works sewer in the area of ​​the circular profile (Huttegg) was replaced as an early measure including gate valves and shafts in 2025/2026. The next anticipated measure is the construction of a new access tunnel including the associated work in the Beckenried substation in 2027/2028. The majority of the measures are to be carried out between 2029 and 2036 and thus parallel to the construction of the new Axenstrasse. The operationally reliable planning of the repair of the Seelisberg Tunnel is given corresponding importance, as closures of the Axenstrasse are to be expected at any time due to natural hazards. The measures implemented are intended to ensure low-maintenance operation until the measures from the second repair "Part III" of the Seelisberg Tunnel are put into operation and thus until at least 2045. The project author mandates were differentiated into a "Part I", in which the Measure Project (MP) phase could be started directly, and a "Part II", for which a Measure Concept (MK) was first developed, resulting in phase-delayed planning of these two parts. The project planning products for Part I (MP) serve as the basis for this tender. The aim is to maintain the thematic structure of the mandates. The subject of this tender is the services of the senior construction management for the measures defined in the aforementioned MP Part I from the phase "Tendering, Comparison of Offers, Award" up to and including "Commissioning