Construction Preparation; Pit For A Circular Swimming Pool; Base Slab - Mountfield IBIZA Montageanleitung

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Construction preparation

3.1

Pit for a circular swimming pool

When digging out the ditch for a (nearly)
inground swimming pool, a working area
50 cm wide or wider must be left for later
installation of the swimming pool
structure parts and their connection to
the piping.
If the inground height does not exceed one-half of the
total pool height and the piping should not be buried,
an area 20–30 cm wide will be sufficient.
Remember that the lean concrete backfilling of the
area immediately after the steel walls must be 15–30
cm thick. More information can be found on page 27.
Recommended pit dimensions:
Swimming pool
Width x length [m]
3.60 diam.
4.00 diam.
4.60 diam.
5.00 diam.
6.00 diam.
For the sake of simplicity the pit has normally a
rectangular shape, although it can, of course, also be
circular or oval as appropriate, with the required
dimension margins.
The dug-out depth depends on the base slab and
gravel layer thickness as well as on the depth and
height of the swimming pool.
The rule of thumb is:
+ swimming pool (inground) depth
The base slab is typically 15 cm thick, the gravel
layer is typically about 5 cm thick (the precise
thickness will be determined by the installing
company depending on the bedrock).
Pit dimensions
Width x length [m]
4.60 diam.
5.00 diam.
5.60 diam.
6.00 diam.
7.00 diam.
Gravel layer thickness
+ concrete slab thickness
= digging depth
Important: If the filter system is not
located immediately at the swimming
pool and the piping is planned to be
buried, then the trenches for the piping
must be excavated simultaneously with
the pit for the pool.
The trenches for the piping must be excavated
simultaneously with the pool pit. They should be
approximately 40–50 cm wide and about 80 cm deep.
If the possibility to completely drain the piping before
the winter season exists, the pipes can be laid higher,
inclined downwards to the (lowest-lying) draining
point.
For this we recommend preparing a large (160 mm in
diameter or larger) plastic or similar pipe at the
appropriate site.
If required, trenches can also be excavated for piping
from the filter system to a solar heating system and
for power supply cables.
3.2

Base slab

Once the pit is dug out and a water draining system
prepared, the concrete base slab (C16/20) reinforced
with a Q 188A construction steel mesh is fabricated.
The recommended base slab thickness is about 15
cm: the actual thickness (and the gravel layer
thickness) should be specified by a specialized civil
engineer.
The base slab should be laid precisely
horizontally, with no gradient, and its
edges should overreach the swimming
pool edges by some 10 cm.
Once again, the base slab can be rectangular or
circular/oval (copying the swimming pool contours).
Warning: Respect the concrete setting
time (typically 28 days). Only a civil
engineer-specialist may decide (on
his/her own responsibility) that this time
can be shortened .
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