Backfill the pit

Observe the following points when backfilling the pit:

  • Backfill the pit according to local specifications and guidelines!
  • Make sure that the pump chamber is in a consistent and vertical position.
  • Secure pump chamber against buoyancy. If necessary, fill the pump chamber with water.
  • The details of the filling material are minimum requirements. Observe local guidelines.
  • Carry out backfilling and compaction on the piping in accordance with local specifications and guidelines.

1

Underlay

2

Levelling layer

3

Compression layers

4

Substructure to the surface level

5

Chamber cover

  1. The pit is backfilled up to the inlet areas at the chamber.
  2. Pump chamber is vertical.
  3. All pipe adaptors are connected and sealed.
  4. Pump chamber extension installed if necessary.
  5. Filling material for backfilling: Sand/gravel, without sharp-edged components, non-cohesive, grain size 0 ... 32 mm)
  1. Professionally backfill the pit and in layers at the same height up to the chamber neck. Comply with local regulations! Compress the individual layers properly (Dpr. 97 %).
  2. NOTICE! Backfill and compress the pump chamber and pump chamber extension by hand (vane, hand rammer)!
  3. Restore surface level with a substructure according to local regulations.
  4. NOTICE! If the surrounding grown soil consists of cohesive material, the substructure can be made with this material. Max. grain size: 20 mm!
  1. The pit is backfilled.
  2. Next step: Install the chamber cover.
Backfill the pit
Backfill the pit