Grundfos NB Serie Instrucciones De Instalación Y Funcionamiento página 22

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3: Grouting
Grouting compensates for an uneven foundation,
distributes the weight of the unit, dampens vibrations
and prevents shifting. Use an approved, non-
shrinking grout. If you have questions or doubts
about the grouting, please contact an expert on
grouting.
Step
Action
Embed reinforcing steel bars into the
foundation by means of 2K anchor
adhesive glue.
The number of steel bars depends on the
size of the base frame, but we recommend
1
that you distribute a minimum of 20 bars
evenly over the whole area of the base
frame.
The free end of the steel bar must be 2/3
the height of the base frame to ensure a
proper grouting.
Soak top of concrete foundation thoroughly,
2
then remove surface water.
Ensure proper shuttering at both ends of
3
the base frame.
If necessary, check the levelling of the base
frame again before grouting. Pour non-
shrinking grout through the openings of the
base frame until the space underneath the
base frame has been filled completely.
Fill the formwork with grout up to the base
frame top level.
Allow the grout to dry thoroughly before
attaching piping to the pump. 24 hours is
sufficient time with approved grouting
4
procedure.
When the grout has thoroughly hardened,
check the foundation bolt nuts, and tighten,
if necessary.
Approximately two weeks after pouring the
grout, or when the grout has thoroughly
dried, apply an oil-based paint to the
exposed edges of the grout to prevent the
grout from getting into contact with air and
moisture.
22
Illustration
Shuttering
Base frame
19-32
mm grout
Formwork
Minimum 20 bars
Grout
Levelling
wedges or
shims left in
place
Top of
foundation -
rough

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