grillage
/ˈɡrɪlɪdʒ/
noun
- A framework of beams or timbers used as a foundation for a structure, especially on soft ground.
- The old warehouse rested on a wooden grillage that had been there for over a century.
- Before building the tower, workers laid a concrete grillage to distribute the weight evenly.
- The engineers designed a heavy timber grillage to support the bridge on the marshy soil.