| 1435 MANHOLES & CATCH PITS
Manholes shall be in precast concrete C-20 quality, brick or Class a hollow block work as indicated and detailed in the drawings. The manholes shall be laid on a minimum concrete bed of 150mm, C-20 concrete.
Manholes other than precast concrete shall be plastered internally and externally where there is no underground infiltration with two coats of cement plaster. Joints of precast concrete manhole shall be flush pointed.
The base of manholes shall be benched using half pipes or C-20 concrete to form smooth transition between inlet and outlet. Benched and other surfaces shall be smoothened in cement screwed.
Manhole covers shall be in cast iron cover and frames or C-25 precast concrete as detailed in drawings.
Manholes shall be enumerated stating the size and shall be deemed to include related earth and other works for the completion of the work.
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