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Concrete Curb Support Retrofit

Concrete Curb Support Retrofit

Concrete Curb Support Retrofit

(OP)
I have two similar situations where a poorly designed parking lot was taken to construction until problems with grades and cross slopes where encountered. Our office has been contacted to analyze the problems at hand. The two situations (regarding curb support) involve the parking lot's concrete median curb throughout the site where the curb detail did not provide enough embedment of the curb onto compacted material. For example, in one detail the top of median curb is 6" above adjacent pavement. With the adjacent pavement section been 3"AC over 4"AB. On the other side the top of the median curb is 12" above the adjacent ground composed of sandy loam (18" deep) material for stormwater treatment. There are curb opennings to allow stormwater to get to the stormwater treatment areas. Below the sandy loam there is a 18" section of compacted drain rock.

The sandy load layer does not provide any bearing support against vehicles hitting the curb when they park. What are your suggestions to provide a retrofit of this situation without tearing the existing curb and starting over? I was thinking of suggesting concrete piers on the sandy loam side and embedding these piers deeper than the compacted drain rock. This would provide some lateral support as vehicle tires hit the curb. Your thoughts? Other ideas?

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