According to the framework of a PPP (Public-Private-Partnership) road construction project,
the PORR Infrastruktur GmbH Company was commissioned, as part of a consortium, with the financing,
building and maintenance of this 58.6 km long section of the M6 Motorway. The new motorway had to
be completed within only 1½ years.
For this section, which runs through the Danube plain, dams, excavations, eleven exits, and dozens
of crossings had to be constructed.
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BGG Consult was commissioned by the general contractor with the geotechnical consulting regarding
the mostly deep-founded bridges and the earth works. Close cooperation with the Technical University
of Budapest was necessary since they acted as the accredited authority and had to approve the
planned works.
The work was conducted in association with Hungarian geotechnical engineers and according to the
Hungarian standards system. In order to verify the results, an additional subsoil exploration was
implemented and evaluated. Based on this, the foundation and the earthwork structures were reviewed
and optimized.
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Pile load tests,
dam settlement:
A peculiar challenge was the optimization of the project design in consideration of the strictly
regulated Hungarian guidelines. After numerous meetings, explanations and calculations, it was
decided to reduce the pile tests, which were originally planned for every object (50 pc.), to only
13 tests. Consequently, significant cost and time reductions were achieved.
For the dams, the ground improvement measures had to be optimized to accommodate the short
construction period as well as to minimize future settlements. Based on extensive settlement
calculations, proposals were made for ground improvement measures (vertical drains) and overload
fills. During construction, the project was continuously optimised based on settlement measurements.
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