Untitled - Future Pipe Industries

Figure 20
6.2: Pipe zone backfilling
The selected backfill material should be placed evenly on both sides of the pipes and compacted as per the requirements of
section 4.1, depending on the backfill material. Appropriate hand or mechanical tamping shall be carried out by the
Contractor to achieve the specified degree of compaction required by the selected installation type. During the first one or
two lifts, special care should be taken to place and to compact the backfill material under the pipe haunches. The best way
to achieve this compaction is to do it manually with the mean of a wooden board. This is one of the most important
installation steps and should be executed diligently. Failure to place and to compact the backfill material
under the pipe haunches may cause ovalization, localized loads and over deflection of the pipes.
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