Kanalbau-Wissen to go!

3 Backfilling the sides

• Before each stage of backfilling, pull up the shoring to the required height.
• Backfill the sides up to the top of the pipe layer by layer.
• Compact each layer in multiple passes.
• Direct the force of compaction towards the in-situ soil of the trench wall.0
• Use only lightweight compaction equipment.
• Be sure the backfill material is free of stones and foreign substances/objects (e.g. wood, waste, topsoil).

4 Covering the pipe

Follow the instructions of the foreperson for the depth of the backfill layer covering the pipe. Minimum depths:

• above the pipe shaft, > 15 cm
• above the pipe bell, > 10 cm

Recommended depth of the backfill covering layer in the guidelines (A 139):
– over 30 cm.

• Before each stage of backfilling, pull up the shoring to the required height.
• The backfill covering layer should be level and extend across the full width of the trench.
• Compact the covering layer in multiple passes, directing the force towards the in-situ soil of the trench wall.
• Use only lightweight compaction equipment.
• Be sure the backfill material is free of stones and foreign substances/objects (e.g. wood, waste, topsoil).