7
Final Adjustment
12
. If the chamber height has been miscalculated and the levels can not be altered by adjusting the bedding of the frame, it is possible to cut
the top section of the chamber horizontally to correct the level.
12.1
. Simply mark the chamber section that requires adjustment and cut by either using a handsaw or a disc cutter.
12.2
. The required section can then be bedded onto the next section using the standard processes.
12.3
. The voids in the top section should now be filled with lean mix concrete to give a solid base for the frame to be bedded on.
Frame and Cover
13
. Once the chamber is backfilled the frame and cover can be fitted.
13.1
. Place the frame on top of the chamber to check that there is adequate space for a mortar
bed. The depth of acceptable bed can vary between client so referral to the appropriate
requirements should be taken. Generally mortar beds can range from 10 to 40mm in
thickness. Pack the frame to the required height using suitable approved materials and
check that the frame is in a coplanar state.
13.2
. Remove the frame and apply the mortar bed. This should be approximately 10mm
higher
than required and 25mm greater than the spread of the underside of the frame.
13.3
. Carefully position the frame on to the mortar bed, taking care that the inside faces of
the frame line up with the edges of the chamber. If using a rising frame this should
happen automatically.
13.4
. Gently tap the frame into the mortar bed until the correct level is achieved, always
checking that the frame is in a coplanar state.
13.5
. Remove any excess mortar that has squeezed into the chamber and trowel mortar over
the exterior flanges/grout bars at a 45° angle away from the frame.
13.6
. After the mortar has sufficiently cured the covers can be installed. (The use of epoxy
resin
mortars can be used and these can have a dramatic effect at reducing curing times.
Please check with client about approval before use).
Reinstatement
14
. The finished surface can now be reinstated around the chamber.
Other Notes
15
. STAKKAbox™ access chambers can be supplied as a fixed-depth unit which will require suitable lifting requirements if planned to be
lifted as a single unit. Lifting eyes, frames or other arrangements can be installed in-factory to accommodate mechanical lifting.
