Caissons are drilled foundation elements, typically reinforced with reinforcing steel. Caissons transfer loads to competent soil or rock stratum. Caissons are constructed by mud drilling, cased hole, or open hole augering.
The main advantages of caissons are:
- Rigid, low settlement foundation element.
- Can be used in poor soils, below water table.
- High capacity.
Challenges associated with Caissons are:
- Large equipment required to complete drilling.
- Significant material usage.