Bored Pile or Pad Footing
Bored Pile or Pad Footing
(OP)
I've designed a car port. The Pad Footing is ended up 3m x 3m x 0.6m thick (10ft x 10ft x 24' thick). The geotechnical report show that the bored hole is stopped at 1m from natural ground level. If I use bored pile, I can end up with 600 diameter (24' diameter) and 1.5m long (5ft long). That mean I save a lot of concrete volume, but I believe that the cost to build the bored pile is more expensive.
Should I go for Bored Pile or Pad Footing ?
Should I go for Bored Pile or Pad Footing ?





RE: Bored Pile or Pad Footing
RE: Bored Pile or Pad Footing
RE: Bored Pile or Pad Footing
Driven pile definitely produce soil friction.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Bored Pile or Pad Footing
Presumably the "floor" of the car port is designed as a slab on grade or asphalt similar to a road. So the load is columns, roof and windload.
Point being the pad foundations seem big for such as structure (unless it's bigger than I imagine). If piles were being used I would have expected a say 150 x 150mm square driven pile about 3m long. Of course I have no information to back up my suggestion, just a general surprise about the foundation selected.
RE: Bored Pile or Pad Footing
If I am not wrong, the pile normally is minimum 1.5m long.
RE: Bored Pile or Pad Footing
On the other hand, with a 6 x 9 roof area, assuming 4 posts, (130 kn x 4) / (9 x 6) equates to about 9.6 kPa (huge). Not even considering your load factors, something sounds screwy.
RE: Bored Pile or Pad Footing
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Bored Pile or Pad Footing
RE: Bored Pile or Pad Footing
If you do not have frost, the situation may be different for you.
BA
RE: Bored Pile or Pad Footing
This leaves you with pad footings, or a slab with deep edge beam.
RE: Bored Pile or Pad Footing
RE: Bored Pile or Pad Footing
Drilling through sandstone isn't as easy or cheap.