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AUSTRALIAN OWNED FAMILY OPERATED ESTABLISHED 1948 We are also agents for: Click Image for More Info   |
Access chamber - Durham - Heel guard grate - NT, SA, WA
There are three types of B.R. Durham & Sons Access Covers and Frames.
- Concrete Infill
- Solid Top
- Paver or Tile Infill
The above have similar methods for installation varying slightly at the construction and installation finishing stages. The following statements are relevant to all of the above.
1. Leave the cover in its frame, ensuring that the rebate surfaces on the pit are even. Place packing pieces under the frame until the top surface of the cover and frame are at the correct level. (Metal shims or packers are ideal for adjusting levels).
2. Ensure the top of the cover and frame are level with each other. All B.R. Durham & Sons access covers have a non-rock feature. If rocking is present adjust packing under frame accordingly until rocking is removed. Please ensure plastic plugs are in keyholes. If the plastic plugs are lost, we suggest using rag or paper to fill the plugholes to ensure concrete does not enter the voids. Once the concrete, (32 Mpa minimum), has set/hardened compress thoroughly to eliminate voids. Grout the frame into position on it's foundations, after grout has dried proceed to concrete encase the frame into position, it is extremely important that concrete fully encases the sides and base of the frame.
Please Note: Minimum of 32 Mpa concrete must be used.
Should the Access Cover be concrete infill, the cover can at this stage be in filled, at the same time concreting/grouting is being carried out. Again a minimum of 32 Mpa concrete must be used. Rapid set concrete/grout can also be used for a faster curing time.
If the Access Cover is a “Solid Top” no extra concrete is required.
Should tiles or pavers be inlayed, please ensure that brass or stainless steel edging is flush with finished flooring, then proceed to tile or pave. (Do not concrete infill brass or stainless steel edged covers). Also consider the new products CAC 99C & CAC 66C.
Ensure the concrete fully supports both the side & underside of the frame
Ensure the concrete fully supports both the side & underside of the frame
