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grating KIO, grating for drain covers
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| Manholes > Instructions for installation |
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Instructions for installation
Like the flexible pipes, the PE manholes need a well compacted bedding and sidefill made with fine grain loose soil (coarse sand and fine gravel).
This bedding must be accurately compacted to limit the settlement on the surface surrounding the manhole and compaction can be easily obtained using simple equipment for compaction.
Besides, the use of loose soil for the trench backfill eliminates the risk of road surface expansion and shrinkage due to the water content variation (variation of the groundwater levels) which is the main cause of road surface strain.
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