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Precast concrete manhole seating rings
Concrete frame adjusting / seating rings are reinforced 65mm deep units which can be used in place of engineering bricks to adjust the ductile or cast iron covers and frames to the required level. They can be quickly and easily installed by semi-skilled labour and there are fewer joints which reduce the likelihood of infiltration. Multi-part
Concrete frame adjusting / seating rings are reinforced 65mm deep units which can be used in place of engineering bricks to adjust the ductile or cast iron covers and frames to the required level.
They can be quickly and easily installed by semi-skilled labour and there are fewer joints which reduce the likelihood of infiltration.
Multi-part adjusting units offer the advantage of lightweight sections enabling one man to handle the units.
Manhole seating rings are manufactured to BS 5911-3 standard in the following sizes:
One-part seating rings:
600mm x 600mm access 675mm x 675mm access 750mm x 600mm access 750mm x 750mm access 600mm x 600mm eccentric
