Unit Overview
P1
P2
P3
P4
P5
P6
P7
P8
M1
M2
M3
D1
D2
Traditional Cavity Wall and Strip Foundation
Raft Foundations and Timber Frame Construction

P3 - Foundation Design

Describe the principles of foundation design

 

Task

Describe the following foundation types and how where they will be used.

  1. Strip
  2. Raft
  3. Piled
  4. Pad

 

(pages 196 -200 will help with your report)

 

 

helicalYou have established that you will need to use a range of different foundations on the housing development due to the range of different subsoil types, explain what kind of foundation would be suited to each type of subsoil.

 

You can present this as a hand written document or use a computer, but it will probably be much easier to describe the types of foundation if you use diagrams.

 

The four types of foundation you should be investigating are, strip foundations, piled foundations, pad foundations and raft foundations.

 

 

 

 

To gain P4, explain how each of the four foundation types can be constructed, you can do this in the same document.

 

strip

strip

Strip

Mainly used for domestic housing

Supports the walls

Not good onmade ground

150mm wider than wall

Depth depends on soil type and weight of superstructure

Must have flat base

Can be stepped if depth changes but not sloped

Can be reineforced with steel

Non-pourous brick or block up to DPC

 

padPad

Good on poor soils

Used for steel portal frame

Steel mesh or rebar to add strength

Steel must not contact wet soil

 

 

 

 

 

 

 

 

 

raftRaft

Warehouses

Spreads loads

Can be used on poor soil

Steel mesh or rebar to add strength

Steel must not contact wet soil

 

 

 

 

Piled

Deep - strong - expensive

Needs pile driving rig

Normally steel re-enforced

Drilled with helical coil auger

Used on large commercial projects

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Click here for an example presentation on this criteria.