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Saturday, June 26, 2021

MANHOLE CONSTRUCTION -QUALITY CONTROL CHECKLIST

Verify the setting out with the latest revised approved drawing/survey report.

Check that the excavation is completed as per the drawing.

Check that the concrete blinding thickness is completed after satisfactory compaction.

Ensure that 3 coats of modified bitumen and one layer of polythene sheet are applied on the blinding as per the manufacturer's instructions.

Check that the formwork is completed and all inserts, pipe sleeves, and embedded items (including the sump pit) are fixed as per the drawing.

Check that the reinforcement is cut, bent, and tied as per the drawing and schedule. Ensure that the radius of curvature is checked randomly for bent bars.

Ensure that the approved concrete design mix is poured and properly consolidated.

Ensure that the formwork is removed after the concrete attains sufficient strength.

Ensure that the curing compound is applied as per the manufacturer's instructions.

Check that the inlets and outlets are grouted around the inserts.

Check that the internal surfaces are finished smoothly as required.

Check that the external waterproofing is done as per the specification or approved drawing.

 


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