7.BACKFILLING 7.1General
Extent of backfill: Unless specified otherwise, above the pipe surround but terminate at the underside of the pavement, that is, at the subgrade level. Do not cause discontinuity in the pavement structure. Do not re-use excavated materials in the pavement structural layers.
Timing: Backfill trenches as soon as possible after the pipe or service has been laid and bedded, if possible on the same working day.
Construction loads: Select appropriate compaction plant compatible with the minimum pipe cover to the service in accordance with manufacturer/supplier recommendation and to ensure that the pipe or conduit is not overstressed at any stage during the construction activity. The compactive effort used for each layer of backfill must be less than the live load capacity of the pipe with the depth of cover appropriate to that layer.
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