www.graf.info
21
/
48
6.
Installation and assembly
6.2.3 Installation below HGV-bearing surfaces
The shaft can only be driven over with HGV in
conjunction with a self-supporting, iron-reinforced
concrete bridge. To ensure that no additional forc-
es or effects of HGV-bearing are transferred to the
shafts, the dimensions and strength of the concrete
bridge must be statically calculated.
6.2.4 Installation next to driven-on surfaces
If the shafts are installed next to roadways used by
heavy vehicles weighing over 3,5 t, the minimum
distance from these surfaces must be at least the
depth of the trench.
6.2.5 Connecting multiple shafts
Two or more shafts can be connected by means of
drilling a hole in each tank and installing, GRAF
special seals and 110mm underground pipe (pro-
vided by the customer).
The openings must only be drilled with the GRAF
special core drill and to the appropriate size. En-
sure that the distance between the shafts is at
least 500 mm. The pipes must extend at least
200 mm into the shafts.
max. 500
H
>H
>500