FOUNDATIONS

FOUNDATIONS

1. Raft

   • Large concrete slab covering whole ground floor plan
   • Soils of low bearing capacity
   • Whole load from building- move as one
   • Expensive
   • Steel reinforcement- vital- steel cage

2. Pile

   • 1. Piles driven/ poured into ground.
     • 2. Top of pile is tied into strip foundation (w/ reinforcing steel)
       • Strip- 'ground beam' - load transmitted
   • Low bearing/ good stratum of soil lies beneath the top stratum
   • Bridges, apartments

3. Strip

   • Low - average bearing
   • House building- low load pressure
   • 'Strips' of concrete
   • Supports building load-bearing walls
   • More economic