4
. AS
S
EMBLING
THE
TELE
SC
OPIC
DOME
SHAF
T
Graf UK Ltd
8
4.1 Assembling the telescopic dome shaft
The telescopic dome shaft enables infinite adaptation
of the tank to given site surfaces with earth coverage of
between 455 mm and 655 mm (Mini telescopic dome shaft)
or 455 mm and 755 mm (Maxi telescopic dome shaft).
For assembly purposes, the enclosed profile seal (material
EPDM) is inserted into the tank dome’s sealing groove and
is coated generously with soft soap (do not use mineral oil-
based lubricants, as these attack the seal). The telescope is
then greased, inserted and aligned with the surface of the
site.
4.2 Telescopic dome shaft on which persons may
walk
Important:
To prevent loads from being transferred onto
the tank, round-grain gravel
2
(max. grain size 8/ 16) is
filled in in layers around the telescope
1
and is evenly
compacted. Damage to the tank dome
3
and telescope
must be avoided during this step. The cover is then
positioned and is sealed to prevent entry by children.
Tighten the threaded connection on the cover so tightly
that it cannot be opened by a child!
4.3 Telescopic dome shaft over which passenger
cars may drive
If the tank is installed under areas used by passenger
cars, the collar area of the telescope
1
(colour anthracite)
must be supported with concrete
4
(load class B25 = 250
kg/ m
2
). The layer of concrete to be installed must be at
least 300 mm wide and approx. 200 mm high all around.
The permitted coverage above the shoulder of the tank
is min.
700 mm
and max.
1000 mm
. There are different
possibilities for lengthening the tank dome (315 mm):
telescopic dome shaft with cast iron lid or Begu (max.
effective length 440 mm) as well as the dapter (max.
effective length 300 mm).
Attention:
Use the cast cover under all circumstances.
4.4 Telescopic dome shaft for HGV loading
When installing below surfaces driven on by HGVs, the
telescope is lined
1
as described in 7.3. The concrete rings
6
(diameter 600 mm) and a cast frame
5
with star-shaped
load distribution are then installed to support the cast
cover. The cast frame must have a contact area of approx. 1
m
2
. To extend the shaft, the telescopic dome shaft for HGV
loading with class D cover, provided by the customer (max.
useful length 440 mm), and the spacer (max. useful length
300 mm) can be used.
Please note:
Can only be driven over with HGV, if a self-
supporting, steel-reinforced concrete plate is installed.
4
ASSEMBLING THE TELESCOPIC DOME SHAFT
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