BWT P-PSC Notice D'installation Et Conseils D'utilisation page 32

4 - SECOND EXCAVATION (Deep end)
Continue excavation of the pool base. The area of the central rectangle should be lowered to the point
indicated on the plan.
The four sides of the diving pit should be sloped (refer to the diving pit diagrams). Using a spade and a pick,
finish the slope cleanly.
5 - IMPORTANT NOTE
In the event of accidental overdeepening, that is, the removal of too much earth, the defect should under no
circumstances be corrected by adding earth.
The shape may be rectified either using lean concrete, stones, gravel, or at a push, sand. Top soil should never
be used, this is prone to compression and could lead to the formation of a vacuum under the pool over time.
6 - UNDERGROUND WATER - RUNOFF - WATER TABLE
Water may be discovered during excavation. This water could be the result of runoff or streaming or you could
have hit the water table. Usually runoff or streaming indicates that you have encountered an underground
stream whereas standing water indicates that you have hit the water table.
The height of the water table can vary according to the season.
Drain using an appropriate technique (refer to the D.T.P. and the standards applicable in the country of
installation - AFNOR in France).
7 - HARD ROCK
Advise the earthwork contractor of the presence of hard rock so that they may equip the earth moving machine
with rock breaking equipment.
8 - POOL BUILDING ON A SLOPE
Cut into the slope to create the entire bed of the pool, earth excavated should not be used to enlarge the
foundations.
However, the wall on the lower part of the slope may be above ground and may be subsequently backfilled
once the proper girding has been installed.
In clay type soils, provide for the complete drainage of the construction: drainage of the sub-bed, along with
drainage of the upper peripheral structure.
DIVING PIT
String
32/48
2020/05 - Indice de révision : B - Code : 37101
Plumb line
Level 0,00
Niveau de la longrine finie
Level after 1st excavation
Taut string marking out the diving pit dimensions
Using a plumb line and taut string,
check the position and the dimensions
of the diving pit
PISCINES P-PSC