04Featured project 2 · Deep foundations
Tremie concrete for bridge piles. Produced through floods and lahars.
Upano River bridges, Macas, Ecuador • Ministry of Transportation and Public Works (MTOP) project • 2023–2024
My role: Project Director and Heavy Civil Manager (subcontractor consortiums)



Drilling by others
The problem
Bridge piles drilled through river gravel and boulders, below the water table, on a river hit by flash floods and volcanic lahars. The piles were poured under water, by tremie. Once a tremie pour starts, the concrete has to keep coming.
Our scope
Our concrete consortium produced and supplied the high-strength tremie concrete and ran its QA/QC. Another contractor drilled the piles. Mixer trucks discharged straight into the tremie hopper, and the concrete rose from the bottom of the shaft, pushing the water out over the top of the casing. Our consortiums' scope also covered abutments, decks, concrete structures and hydraulic protection.
The result
Concrete production kept running through floods, river currents and lahars. The project is complete and has been handed over.










