Filling the pit for the pump chambers with A15 and B125 covers installed

Pit filling (with A15 and B125 pump chamber cover installed)
Pit filling (with A15 and B125 pump chamber cover installed)

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Underlay

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Levelling layer

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Sand/gravel layer without sharp-edged content, grain size: 0...32 mm, max. layer thickness: 300 mm

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Concrete adjusting rings for pump chamber extension

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Surface level substructure

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Pump chamber cover class A15 or B125

With the cover frame, fit the A15 or B125 pump chamber cover directly in the cover flange on the pump chamber or the pump chamber extension. The supplied cover frame is max. 825 mm in outer diameter.

  1. Fill and compact the pit one layer (max. thickness: 300 mm) at a time with coarse-grained soil (sand/gravel with no sharp-edged content, grain size: 0 ... 32 mm) all around to an equal height. Manually compact (with a shovel, hand rammer) the areas directly next to the pump chamber wall, the cover flange of the pump chamber, and the pump chamber extension. Make sure that the pump chamber is in a plumb-vertical direction and without deformation. CAUTION! Keep the top sand/gravel layer (compacting layer) at the same height as the cover flange. CAUTION! Obey the local standards to embed, fill and seal the piping.
  2. Align the surface level, including substructure, with the pump chamber cover.
    CAUTION! If the all-around ground is cohesive material (e.g. topsoil), fill and compact the “substructure to surface level” with the material with max. grain size of 20 mm for better assimilation.