Frame cross members (usually beams, channels or box section) can either be removed or remain in position when placing the frame, this being dependent on the equipment available for lifting (Fig 2). On larger units the beams will be bolted in place to help stabilise the frame. Note: Care should be taken when handling beams, their weight can exceed 40kg per metre.
The top edge of the frame needs to be set level and at the correct finished floor height, achieve this by using hard shim material between the frame and the cover slab. (Fig. 3). Also ensure that the frame is square and that the sides are straight, spacing and packing where necessary, bolt the frame in position using M12 anchors through the 13 mm diameter holes provided in the frame flange (Do not overtighten as this can distort the frame).
Finally, fill the cover recesses with concrete, to achieve design loads all covers should be fully filled with grade C30 concrete. Where the final finish is to be tarmacadam deep recessed covers (100 mm minimum) should be used, with 2/3 filled with C30 concrete and the top 1/3 with blacktop. Tape over cover edges, keyholes and locking bolts to avoid blockage by surplus fill material.