Key Installation Requirements
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Clear Opening

The clear opening is the unobstructed opening inside the frame, see Figure 4.  The clear opening of the frame must be equal to or larger than the clear opening of the pit. 

Dimensions are given as width (W) by length (L).  Refer to ACO Access brochure for the complete dimensions of all the Rhinocast covers available.

Figure 4 - Clear Opening

Rebate Dimensions
To support the anticipated loads, the rebate must be cast according to Figures 5, 6 & 7.  For covers with decorative edging add the height of the edging to the recommended rebate depths.  The dimensions shown are the recommended minimum amount of concrete required to fully support the frame.  Reinforcing may be required in the rebate under the frame.  The reinforcement should be installed to the engineer’s details.

Figure 5 – Class B Rebate

Figure 6 – Class D Rebate

Figure 7 – Class G Rebate

Concrete Specification

  • Minimum compressive strength of 32 MPa at 28 days
  • Minimum cement content of 400 kg/m3
  • Aggregate size: 10-13mm

Load Class
Select the correct Rhinocast ductile iron access cover to suit the required load class and application, refer to pages 6-9 in the ACO Access brochure for further details. 

Covers & Frames
Covers and frames are a matching pair and should never be mixed with other covers and frames as the seal may be compromised.

Rhinocast Lifting Keys                                                 
It is important that the appropriate Rhinocast lifting key is used, see Figure 8, 9 &10.  To remove a Rhinocast cover, insert the key and rotate clockwise a quarter turn and lock into position.  Position the jacking screw over the frame and screw down using a shifting spanner to break the seal.

Figure 8 – Short Handle Lifter
Part No. 84654

Figure 9 – Long Handle Lifter
Part No. 84854

For Road Traffic
The lifting end/drawcut edge of the cover, see Figure 11, should face the orientation of traffic flow to prevent the cover lifting, see Figure 12.

Figure 11 – Undercut & Drawcut Edge

Figure 12 – Road Cover Orientation

Decorative Edging
A strip of stainless steel or brass can be fixed to the edge of the cover and frame to deepen the cover’s rebate to accommodate tiles or pavers, see Figure 13.  

For these applications, keyhole bosses will also have extensions to match the height and material finish of the decorative edge.  The top of the decorative edge corresponds with the finished floor level of the cover.  Ensure that the rebate has been formed with an allowance for the relevant height extensions (refer to Figures 5, 6 & 7 for standard rebate dimensions). 

Tiles or pavers should be fully restrained and bonded to the concrete bed.  An epoxy mortar is recommended.

Figure 13 –
Decorative Edging

Site Support
Dependent on the location of the installation, ACO can provide supervisory support if requested.


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