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Posted: Sat Oct 13, 2007 12:37 pm
by Ramsey
Hi,
I need to construct a supporting natural stone wall out of purbeck walling. The problem I have is that the foundations that have been laid are not wide enough to accomodate a concrete block wall behind the natural stone wall that I would normally build. Will it be sufficient to build the natural stone wall and backfill it with concrete to reinforce it?
Cheers guys,
Ramsey 
Posted: Sat Oct 13, 2007 12:48 pm
by lutonlagerlout
it would be better rams if you could drill some 10 mm holes and hammer in some 10 mm rebar say 150 less than the height of the wall ,then concrete
dont forget your weepholes
cheers LLL
Posted: Sat Oct 13, 2007 4:46 pm
by palladio
If its a retaining wall a general rule of thumb is that an unreinforced gravity type retaining wall needs to be a thickness at least a third of the retained height although it can taper from base to top.
In a reinforced ret. wall the base is reinforced as well as the stem with L bars between. But if the concrete base is wide enough to resist rotation you could chemical anchor in, say T12's at 200mm centres and put a reinf. mesh in the stem like an A393. An obvious point but the stone facing as a permanent shutter would needs a lot of support to prevent it bursting with the pressure of concrete.
Pete
Posted: Sat Oct 13, 2007 8:44 pm
by seanandruby
cant you widen the footings enough to accomadate the blocks? there would be a lot of pressure against the stone until it goes off. maybe you could fix rebar, build the wall and strut it temporary before you concrete behind with a low slump mix.
Posted: Sat Oct 13, 2007 10:14 pm
by Ramsey
Thanks for the advice guys,
Much appreciated,
Ramsey