Great to have assisted Teréga for its pipeline deviation under the Adour River, which was successfully completed in southern France last week. The project will increase pipeline durability and allow the river to be restored back to its natural state, as the existing fish passes can now be removed.
The 500-metre long DN 600 HDD crossing, which replaces a surface laid pipe, passes through marl formations, drilling down 23 metres under the riverbed. Gravelly surface conditions called for a DN1200 steel casing at the entry point as well as an 8-metre excavation at the exit.
OPTIMUM engineers carried out both the feasibility study (G1 PGC) and the detailed engineering (G2 PRO). Sound geotechnical knowledge of the area ensured the project was designed to minimise impact on the natural environment at every stage, preserving the river’s fauna and flora as well as the nearby listed woods. The trenchless specialists then also monitored drilling operations throughout, keeping works running smoothly and in line with project owner Teréga’s specifications.
Congratulations to everyone involved: Teréga, Infra, SPAC, OPTIMUM
