ALBISTONE
®
G1 BENEFIT/G1 PLUS Skimmer Pools /
5
2.
SD
2. Excavation Depth – Calculation.
Determine the depth of the pool excavation and of the excavation for placing the technology shaft
according to the calculations below. First determine the total depth of the pool excavation. The depth
of the excavation for the technology shaft (counterflow shaft) should be determined afterwards. The
height of the step (E) for the correct placement of the technology shaft should be determined at the
end. Please remember to account for the difference from the raised terrain (U). The value “U” directly
addresses the final height of the complete construction of the pool; therefore it is necessary to take
into account all the construction steps performed subsequently (raised paving, recessing or raising
the pool, etc.).
The upper edge of the technology shaft should be set to at least 40 mm (F) above the planned final
surface around the pool (make sure it does not collide with the travelling front of the roof). This is due
to the need to protect the shaft from rainwater. If you do not want to have the shaft elevated above
the final surface level, adequate drainage of rainwater must be provided around the shaft. The shaft
must not be located where the future rails for the roof will be installed. The bottom of the shaft is
intentionally kept without thermal insulation so that the shaft is naturally ‘heated’ in the winter from
the soil below.
A1
gravel bed with drain pipes
200 mm
A2
concrete foundation slab with a rebar mesh
200 mm
B
bottom insulation (extruded polystyrene)
30 mm
C1
pool bottom thickness
8 mm or 6 mm
C2
pool depth
subject to the pool type
D
total depth of the technology shaft/counterflow shaft
technology shaft = 1213 mm
counterflow shaft = 796 mm
E
difference in elevation between the pool foundation slab and the
shaft foundation slab
(H + F) - (A1 + A2 + D)
F
elevation of the technology shaft specified by the manufacturer
40 mm
G
concrete plus gravel (gravel 50 mm; concrete 100 mm)
150 mm
H
pool excavation depth
A1 + A2 + B + C1 + C2 + (±U)
SD
shaft excavation depth
(D - F) + G + (±U)
U
thickness of paving/stone carpet/pool recess
subject to the type
Surveying and excavation
