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Topic: Recess cover - lowering advice< Next Oldest | Next Newest >
mosquat
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Digger




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Posted: 21 June 2017,17:48 QUOTE

Hi all,

I need to lower the existing cover slightly, and then I can hopefully fit a square to round recess cover.

however has anyone got any advice on what I can do with the current riser (pictured)?  It seems to be made of metal so not sure if it can be cut or maybe there are "rings" I can remove once the existing cover is removed?

hoping someone has seen one of these before and can point me in the right direction:



Cheers for any help

Carl
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digerjones
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Posted: 21 June 2017,18:15 QUOTE

I would say they are plastic risers, if so quiet straight forward.

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dylan
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seanandruby
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Posted: 21 June 2017,18:44 QUOTE

The cover is metal about 30ish ml thick. The risers will be plastic, about 300ish in height. I presume this will be in a driveway?  Cut the existing to required height allowing an upstand to stop concrete falling in i c.  The top 150 will need to be a concrete plinth. Wrap around the fins with something so that no concrete actually touches the fins , that way the i c won't be load bearing.

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sean
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mosquat
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Posted: 21 June 2017,19:21 QUOTE

Thanks for the advice, I will double check them again but they feel metallic, I hope you're right of course.

Sean - great advice. Are the fins the technical term for the riser rings? Sorry for the dumb Q
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seanandruby
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Posted: 22 June 2017,06:54 QUOTE

If they are metal then you will need to cut with a petrol saw such as  sthill saw and metal cutting blade. No a riser is correct term. As you can see it's smooth on the inside riser but on the outside there are 'fins'.  If you sctatch the inside with a nail, screwdriver, it will give you an idea of material used. Never come across a metal riser before.

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sean
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Tony McC
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Posted: 22 June 2017,13:01 QUOTE

They are plastic risers/raising sections, so it's nowt more complicated than breaking out the concrete haunch around the existing circular frame and then using a nangle grinder to slice through the riser from inside the chamber.

Best to dig out around the raising piece *before* you cut it, to a depth roughly 50-100mm below where you intend to cut it, so that the backfill material doesn't fall into the chamber whgen you remove the unwanted section.


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mosquat
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Digger




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Posted: 22 June 2017,16:59 QUOTE

Cheers everyone, consensus this end is plastic too, glad we had this discussion all the same
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jwill
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Posted: 24 June 2017,08:52 QUOTE

So these lids should always be bedded off the subbase rather than connect to risers if in a driveway?
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seanandruby
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sean




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Posted: 24 June 2017,09:40 QUOTE

All I Cs inspection chambers, covers, lids etc: have different loadings, surround specs' etc: in a drive there must be 150 ml deep  concrete plinth surround.

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sean
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Tony McC
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Posted: 24 June 2017,12:53 QUOTE

The circular covers for circular ICs bed directly onto the raising rings but, when used in a pavement subject to vehicular traffic, they are usually set onto a concrete bed which surrounds the raising ring, to reduce the vertical loading on the IC.

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jwill
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Posted: 24 June 2017,13:33 QUOTE

Yes understand. Still connected but bedded/haunched to spread load
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seanandruby
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sean




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Posted: 24 June 2017,15:46 QUOTE

Bearing in mind the vertical load is still imposed if concreting directly against the ribs/fins. An external shutter is needed around the riser to avoid concreting the ribs/fins with concrete collar. The collar/plinth needs to be wide enough to carry the frame.

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sean
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Forestboy1978
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Posted: 10 July 2017,21:22 QUOTE

I did this exact thing only last month to 3 drains that were creating tripping hazards. Marked a line where I wanted to cut, drilled a hole and then cut through them like swiss cheese with a jigsaw. Billed an architectural company 270 for that and re haunching the lid supports. Took me 2 hours including travel time. Was chuffed as pie.
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ruler

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