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Posted: Thu Mar 13, 2008 4:36 pm
by TDCivils
I am designing several block paved private access and parking areas. Apart from cars these will be trafficked by the occassional heavy goods and refuse collection vehicles. No problem with specifying the construction make-up itself however two questions regarding restraint of the blocks:
Some of the areas span up to 20-30m in both directions. Where the gradient/cross-fall is constant (1in30 approx) should an interim restraint such as a bed and haunched concrete channel block on edge with its upper face flush with the surface be provided perpendicular to the fall?
In some instances there is a fairly abrupt change in cross-fall gradient between carriageway and parking bay (1in30 to 1in15) should a restraint similar to the above be provided at the gradient change?
Posted: Fri Mar 14, 2008 2:55 pm
by Tony McC
I'd prefer to see the site layout plan, but in most cases, I'm a firm believer in the use of intermediate restraining courses (IRC) on any CB pavement with dimensions in excess of 15m. and even more so when there's a gradient involved, and even more even more so when there's heavy traffic on that gradient.
The IRC doesn't need to be a channel: it can be a matching block, or just a contrasting band course, whatever suits the site. The key thing is to limit spread/creep of the blocks, and more importantly (for me) the laying course material.
Posted: Fri Mar 14, 2008 6:13 pm
by lutonlagerlout
we are doing a drive at the minute and due to various falls on the existing paths and stuff its a bit off a pain,
but i think the band course bedded in concrete is a good idea as i hate to see BP in different planes,it looks pants rolling this way and that
much better to delineate it
LLL
LLL 
Posted: Sun Mar 16, 2008 2:26 pm
by TDCivils
Tony McC wrote:I'd prefer to see the site layout plan, but in most cases, I'm a firm believer in the use of intermediate restraining courses (IRC) on any CB pavement with dimensions in excess of 15m. and even more so when there's a gradient involved, and even more even more so when there's heavy traffic on that gradient.
The IRC doesn't need to be a channel: it can be a matching block, or just a contrasting band course, whatever suits the site. The key thing is to limit spread/creep of the blocks, and more importantly (for me) the laying course material.
Thanks that's very useful.
One further point. If the IRC is a matching block how would it be fixed in place? It could be bedded on concrete but not haunched at the sides if surrounded by other blocks. Would the bedding alone restrain the block sufficiently?
Posted: Sun Mar 16, 2008 7:09 pm
by Tony McC
Use a deeper block, is one solution amongst many.
