Rehau RAUSIKKO Box MX Einbauanleitung Seite 42

42
04 Excavation pit and bedding
EN
The applicable legislation on accident prevention for excavation as well as the
applicable standards for digging excavation pits and trenches are to be observed.
The length of the trench equates to the length of the percolation or storage system
plus approx. 1 m of working area.
The width of the trench also equates to the width of the percolation or storage
system plus approx. 1 m of working area.
The depth of a Box-gravel trench equates to the height of the gravel trench and the
coverage height and the height of the fine gravel bed (see below).
The depth of a ditch-gravel trench (with a Box-gravel trench underneath the ditch)
equates to the depth of the ditch plus the depth of the gravel trench (according to
design) and the thickness of the top soil layer (normally 0.30 m) and the fine gravel
bed (ca. 0.10 m, see below).
The base of the trench must be free of stones, even, and without any gradients.
The load bearing (compressive strength ) capacity and permeability of the base must
be at least equal to the grown ground. If necessary, suitable measures are to be taken
(soil replacement, re-compacting, etc.).
An approx. 10 cm thick fine gravel bed with a 2/8 mm grain is to be laid on the base.
The bed is to be distributed thinly and evenly using suitable equipment (planer or
similar). Laying the gravel layer is to be carried out with great care.
Prepared excavation pit