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Any geotech engineers here?

breadmonkey · 2011-03-05 15:30:57

If so, I was wondering if you could tell me what the phrase "predredge to grade" means? It's the "to grade" part that I don't understand. This is in the context of predredging a river bed as stage one of installing sheet pile cofferdams to facilitate the construction of bridge piers. Thanks

05-03-2011 3:30pm

#1

breadmonkey

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If so, I was wondering if you could tell me what the phrase "predredge to grade" means? It's the "to grade" part that I don't understand.

This is in the context of predredging a river bed as stage one of installing sheet pile cofferdams to facilitate the construction of bridge piers.

Thanks

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#2 06-03-2011 6:55pm

GY A1

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hi breadmonkey

predredge to grade will mean that the river bed will first need to be dredged or excavated to a certain fall, its similar to say a new sewer pipe which is excavated and then laid to certain levels and falling at a specified grade, ie 1 in 100 means a grade falling 1m in depth every 100m in distance,

this lowering of the river bed will be carried out before the piers are constructed.

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