N8 Lungern North Giswil South Construction lot 21 route and engineering structures north

The CONSTRUCTION AND SPATIAL DEVELOPMENT DEPARTMENT OBWALDEN CIVIL ENGINEERING OFFICE in Switzerland from Europe region has released this tender for In the area between the south portal of the existing Giswil tunnel and the new Kaiserstuhl tunnel separate already awarded as construction lot 19 the road infrastructure will be expanded so that in the future the national and cantonal roads can be routed separately over two separate routes Today s Br nigstrasse route runs over the existing Buochholz Bridge past the OWi-Land to the Lungerersee The existing Buochholz Bridge will be used for the national road after the opening of the Kaiserstuhl Tunnel A new road bridge will be built for the cantonal road parallel to the existing bridge already awarded separately as construction lot 20 In the present construction lot 21 the services for closing the gap between the Griffeldossen Buochholz area construction lot 20 and the Kaiserstuhl Tunnel construction lot 19 are being procured The services include route work for national and cantonal roads with supporting structures as well as a SABA a PW terrain modeling in the Marchgraben area hydraulic engineering work and smaller engineering structures With this procurement services for master builder work are being procured for the main work described below Road construction and factory line construction ------------------------------------------ New construction of a national road with a length of approx 500 m a total area of around 7 500 m2 including a connection to Giswil S d as well as road reconstruction of the existing Br nigstrasse with a length of approx 400 m a total area of around 4 000 m2 and new construction of Flurstrasse Each including substructure drainage surface and marking as well as various work pipe relocations temporary arrangements and new constructions including new fire water pipe for the Kaiserstuhl tunnel For this purpose the new SABA Schwendiboden and the north portal stacking basin are being built in the perimeter excavation pit protection with stirring and nail walls In addition this construction lot will be used to procure the services for the decking construction approx 16 000 m2 and marking 2 1 km length of the Kaiserstuhl Tunnel construction lot 19 Terrain modeling and hydraulic engineering ------------------------------------------ Adaptation of the channel upper and lower reaches and the Marchgraben bedload collector block stone base approx 2 500 m2 as well as new construction of the shallow-founded Marchgraben end structure reinforced concrete culvert with a 6 2 m span Various terrain modeling work in the Marchgraben and Trassee area removal of approx 25 000 m3 and filling of approx 35 000 m3 New construction of supporting structures and engineering structures ------------------------------------------ Construction of two angle retaining walls each around 140 m long and up to 9 m high including backfill approx 5 500 m3 and the North Tunnel Kaiserstuhl portal structure in the area of the new N8 route Construction pits have already been created in a preliminary lot construction lot 17a Sometimes working in traffic with tender notice no. 42494-simap_ch published on 20 Aug 2026. The tender is due to expire on 15 Oct 2026. This tender is sourced from SIMAP and is eligible for suppliers interested in Road construction works. Interested bidders can obtain further information including complete bid documents or ways to participate by registering on Tender Impulse and referencing via Tender Impulse ID 14444957.