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In Australia, manhole also commonly refers to an access hatch used to get access from a room or hallway into the ceiling cavity of a building.^[3][4] These manholes are typically around 450 mm × 450 mm (18 in × 18 in) square.

Frequently asked questions

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Once planning is complete, the next step is excavation. The area around the existing manhole should be carefully dug out to expose the structure beneath. The depth and diameter of the excavation must allow for the proper fitting of the frame and cover. The subgrade, or the bottom of the excavation, should be firm and level. If the existing subgrade is unstable, it may be necessary to add a layer of compacted gravel to create a solid foundation.