9. Once box is level
measure the
distance away
from pool headers
so they are the
same either side
within a couple of
millimetres.
5. Level these slabs so they are approx.
512-515mm (BGB) or 356-360mm (BGB
Small) below the finished height of paving or
concrete. Place spirit level on pool headers
and lay across the trench propping the other
end up so spirit level is level, using the level
measure down to slabs to obtain correct
depth of slab, use rubber mallet to tape
down to bed slab in.
7. Once blue metal is
down you are ready
to place box into
hole. Carry box to
the trench edge,
place rope or straps
under each end of
box and use these
to lift and lower into
hole.
11. Once box is level and square to the pool start
back filling with soil and washing in soil as
you go to eliminate any air pockets around
the box.
13. To prevent lid from decolourisation, protect
lid from concrete slurry, sealers, acids and
chlorine.
6. Once both slabs are in place and at correct
level place for sufficient drainage, blue metal
or aggregate along the trench making sure
you do not exceed more than 50mm above
the slab height, for boxes with a centre brace
or braces leave a small amount out so brace
doesn’t touch the blue metal.
NOTE: Take note of site and soil drainage
requirements. Extra (sub soil) drainage may
be required to take water away from the void
of the BGB. If there is not sufficient drainage
the BGB will fill with water.
8. With box in the hole
and end braces are
sitting on concrete slabs
level box up to required
height via the 4 bolts
inside the box, screw all
4 down so they touch
the concrete slabs and
then every 1 turn gives
you approx. 1mm of lift.
Make sure cover does
not touch bolt head.
10. Place supplied
spacers between lid
and front extrusion
on the box prior to
back filling
12. Leave spacers in place until paving or
concrete has been completed, this will
prevent any extra pressure caused from
walking around the box or compaction
pushing walls in too far.
14. The roller Bevel Gearbox drive mechanism
can be installed either side of unit. To change
ends simply unbolt the 8mm mounting bolts
(through square tube) to remove and turn the
roller around
