How Do You Build a Bridge Pier in Water? 😮#shorts

3-Second Blueprint (English)

1. Engineers build a temporary cofferdam enclosure in moderate water to pump out river water and expose solid ground for excavation.
2. Crews install steel reinforcement and pour concrete footings inside the dry cofferdam, raising the pier above water before re-flooding.
3. When strong river currents prevent cofferdams, engineers sink a watertight caisson to the riverbed to construct foundations underwater.