© Roche

    Roche building 2, Basel

    As part of the modernization of its historic site in Basel, F. Hoffmann-La Roche Ltd is erecting Building 2: this office building will be 205 m tall and located directly opposite the new Building 1, which is already in operation.

    After the demolition of the existing Building 43, the construction of Building 2 required an excavation pit of 20 m deep (10 m below the groundwater table) as well as 103 large bored piles (d=1.5 m) as foundation piles on an area of 2,400 m². Because of risks of settlements damages in the surroundings and due to lack of space, anchors could hardly be implemented to support the excavation pit. Instead a bracing plate was designed (modified top-down method). For the highly stressed intersected bored pile wall, the primary piles had to be reinforced with HEM800-S355 steel beams (in addition to the reinforced secondary piles) to increase the bearing capacity.

    The foundation consists of a combined piled raft foundation (CPRF) to reduce the settlements of Building 2. The foundation was computed with 2 coupled finite element models (structural and geotechnical models). These models have been iteratively and automatically matched with a self-written procedure. The input parameters of the 3D-FE-models were calibrated according to the long-term measurement results of the neighboring high-rise Building 1 - also founded on a CPRF. In addition, several static and dynamic pile tests of Building 1, which were carried out up to failure, were used for a better calibration of the ground parameters.

    Services provided by Gruner Ltd's Geotechnical Engineering Department and Gruner Lüem AG comprise:

    • Planning for the following phases: preliminary design, basic design, detailed design, tendering
    • Demolition/deconstruction, excavation pit, combined piled raft foundation, bracing slab
    • Deformation forecasts and monitoring for the excavation pit, foundation and neighboring buildings due to the excavation of the pit, dewatering, construction of piles and anchors, building construction
    • Construction management for the demolition, excavation pit, foundation, bracing slap

    Services provided by Gruner Ltd's Structural Maintenance Department comprise:

    • Crack-monitoring, preservation of evidence, monitoring of noise and vibrations

    Geotechnical engineering and foundation,
    Structural design


    Your contact person

    Jörg Meier
    Digital Development Geotechnical Engineering
    +41 61 317 62 53 | am9lcmcubWVpZXJAZ3J1bmVyLmNo

    Gruner AG
    St. Jakobs-Strasse 199
    CH-4020 Basel

    Laurent Pitteloud
    Head of Geotechnical Engineering
    +41 61 317 63 76 | bGF1cmVudC5waXR0ZWxvdWRAZ3J1bmVyLmNo

    Gruner AG
    St. Jakobs-Strasse 199
    CH-4020 Basel

    Ralf Hebecker
    Deputy Head of Geotechnical Engineering
    +41 61 317 61 21 | cmFsZi5oZWJlY2tlckBncnVuZXIuY2g=

    Gruner AG
    St. Jakobs-Strasse 199
    CH-4020 Basel

    Roland Marty
    Head of Business Unit Building retrofit Northwestern Switzerland
    +41 61 317 63 33 | cm9sYW5kLm1hcnR5QGdydW5lci5jaA==

    Gruner AG
    St. Jakobs-Strasse 199
    CH-4020 Basel

    References on the subject

    Roche Building 1, Basel
    Roche Building 10, Basel
    Viaduct Sittertobel
    Automated cost optimization of the inner lining of the second Lötschberg base tunnel tube
    Road tunnel in the vicinity of a recent slope slide