The covers and frame need to be lifted as one unit and placed centrally over the chamber clear opening. Local spacers should be used below the frame to set the top of the assembly to the finished floor level. If the finish is too deep for a mortar bed use courses of engineering brick work to raise the frame, the base of the frame needs to be fully supported.
Open the covers ensuring that the safety stay bars are fully engaged in the open position.
The demountable safety barriers and fall protection grids are optional factory fitted extras and are not supplied as standard, these items cannot be retro fitted.
Note: Assisted lift products may have the spring pre-tension reduced for safety during transport and handling, be aware that this considerably increases the opening weight of the covers at installation stage, once fully installed the springs can be reversed to activate. Covers supplied in this condition will be labelled accordingly on the underside of the lid.
The top edge of the frame needs to be set level and at the correct finished floor height, use hard shim material between the frame and the cover slab to achieve this.
Also ensure that the frame is square and that all sides are straight, space and pack if required, close the covers as necessary to check the fit during this operation.
When in the open position the cover sides should be vertical and not interfere or collide with adjacent lids, all covers should close and open independently, unless intentionally interlocked for sequential opening. Colliding covers (open or closed) indicates that the hinged side of the frame is out of true and must be adjusted.
Close the covers as a trial fit, ensure that the covers do not rock and that they sit neatly with even gaps around the frame and adjacent covers, making any necessary adjustments to the frame to achieve this.
Check engagement of the cover locks but do not overtighten, covers should sit flat without excessive clamping from the locks.
Note: It is critical to achieve a good fit at this stage, it cannot be improved once the frame is cast in. Do not cast the frame in position without checking the operation of the covers and locks.
Care should be taken when removing and handling beams as weights can be in excess of 40kg per metre.
If the beams are fixed in place, remove the bolts, nuts, and washers, and retain for replacement later.
Remove the shorter transverse beam first, followed by the longer main beams (beams that are bolted to the frame should be identified / marked to ensure that they are returned to their original locations).
For safety reasons springs on some covers may have been disabled, removing pre-tension from the frame during transport and installation.
Be aware that covers in this condition may not be suitable for one man lift until fully installed and the springs reactivated.
In the case of shallow frames, where the spring retaining brackets protrude below the base of the frame, support must be provided by the chamber wall, add packing between the bracket and chamber if necessary.
Failure to provide proper support for the bracket will allow it to flex, resulting in loss of spring tension and increased cover lifting weights.