Replacing a manhole frame and cover

31 Mar 2010
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Newcastle upon Tyne
United Kingdom
My cast iron manhole cover is broken I've bought a new one the same size but the corners are more rounded. How do I go about removing the old frame and putting in the new one?

Advice needed please.
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Without being to simplistic you just need to break it out, take off the cover, get a chisel/bolster and bash it (with a hammer) from inside, under the old frame and work it all the way round til loose, clean off any old mortar and relay on 3:1 sand cement mix, jobs a good'un!
Chop out around existing frame with a hammer and bolster, (eye protection advised!). From inside carefully chisel the mortar bedding the frame, until enough is removed to lift frame off the masonry. Suitable care must be taken to prevent any debris going into the sewer! Clean as much mortar off the masonry as possible.

Bed new frame on fresh mortar, use a level or straight edge to align with surrounding area if need be. Smooth off internally, make good around externally as required. If you have a new cover with a plastic frame its best to put the cover in whilst mortar is still wet, these frames can distort and you may find the cover wont fit when the mortar has gone off.
What .... no mention of putting something inside the manhole to catch all the debris that inevitably falls into it? :rolleyes:

Nor greasing the frame? :rolleyes: :rolleyes:

Put some slate or tile pieces under the corners so that the frame does not sink on the mortar
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Making sure nothing falls into the manhole is very important, having a blocked manhole full of sewage is not a nice surprise for the house holder.


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