So it is against this backdrop that Frank Fondation worked for a whole year on all the deep foundations and retaining structures works to allow their client Demathieu Bard to:
- replace all the existing platforms and tracks with 25lm-long steel decks, resting on blocks with micropile foundations,
- set up the project’s ancillary structures (such as for instance the deck handling crane and the platform 5 access stairs) on micropile foundations,
- slide the underpass into place, sheltered by the nailed wall, under the provisional decks previously put in place.
The stand-out stages of this worksite, considered one of the biggest in Ile-de-France for SNCF, were as follows:
Resumption of the works in mid-April 2020 after a month-long works stoppage, in a complex public health situation, even though the majority of the country was still locked down. Several weekends of works (52 consecutive hours day and night) allowed FRANKI FONDATION to set up the final micropiles on the tracks using 4 workshops and involving over fifty people.
From the month of May 2020, once the micropiles had been set up and the tracks laid, the works on the retaining wall and earthworks began. The creation of a nailed wall under the active tracks and a soldier pile wall supported the embankment prior to the setup of the new underpass.
The 2,500-tonne, 11.50m-wide, 70m-long underpass (two 35m sections) was slid into place last September both on time and hassle-free, plus the process proved particularly spectacular.
This stage was the fruit of the labours of all FRANKI FONDATION’s teams, particularly the worksite managers, over the previous 10+ months.
In conclusion, as a result of the success of the weekend works and setting up the micropiles on schedule, the retaining structure works could be begun with complete peace of mind and the underpass slid into place on the scheduled date. This success was hailed by the client.
These works will be added to in 2021 with the setup of a second nailed wall to connect the underpass to the platforms.
Project owner: SNCF
General contractor: SNCF
Client: Demathieu Bard
