What we do

Challenge

At 5,400 m in length, the offshore viaduct will connect Saint-Denis (the administrative capital of La Réunion) with La Grande Chaloupe. It will provide 2×3 traffic lanes, two of them dedicated to ‘soft’ modes of transport (buses, pedestrians, bicycles).

This viaduct is the major structure of the new ‘Route du Littoral’, which will replace the existing cliff road between Saint-Denis and La Possession, which was subject to rockfalls and flooding during tropical storms.

Solution

We had to dredge the 48 pits for the viaduct and perform the placement and levelling of gravel bed layers in the pits. Then we had to refill and level the material after our customer had installed the viaduct piles. As we were working in offshore conditions we closely monitored the sea state using prediction tools deployed alongside the project’s location.

Our scope included:

Dredging: 530,000 m³
Filter 2-30 mm : 7,400 m³
Filter 30-80 mm : 51,000 m³
Levelling filler bed layer: 67,000 m²
Backfilling of pits: 235,000 m³
Levelling of backfills: 100,000 m²

Used technology

Backhoe dredgers

Self-propelled split hoppers

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