Installation
35 / 72
2017/11
010-657
3.5
Installation depths LW 1000
T1
T2
T3
T4
1
2
3
4
A
D
E
A
B
C
E
E
B
B
D
A
E
B
B
B
C
A
Fig. [7]
T
Installation of closed base
T1
1150-1650 mm
T2
1650-2150 mm
T3
2150-2650 mm
T4
2650-3150 mm
3.6
Preparing the excavation pit
The substrate and filling material around the chamber must have the following properties:
• Substrate:Level, layer of compressed crushed stone/gravel approx. 30 cm deep*.
• Fixing of the base element using lean concrete (see Fig. [26] [27]).
• Filling material at the side: Ring-shaped, all the way round approx. 50 cm, gravel size 0/16, compressed every
30 cm
(see Fig. [26] [27] [28] [29).