Manhole risers

[jack101]

Hi folks, installing a manhole or possibly several and im wondering if there is an alternative to large concrete 1200mm dia rings?whats the largest plastic size available? something round about 900mm dia would be good. the depth is about 1400mm or less. i could "bury" the manhole about 200-300 mm as it wont need to be accessed much.
thanks

[GB_Groundworks]

soeak to some one like burdens or keyline that do civils stuff, theres pretty much everything you want in the catalogues, what about concrete rectangular ones?

[jack101]

trying to avoid concrete if possible, only need something lightweight, not super heavy duty.

[Dave_L]

Plastic 450 m/h sections with an access restrictor will satisfy building regs

[jack101]

the pipe is about 250mm dia so 450mm is probably too small. plastic needs to be big diameter or it has to be concrete i think

[Dave_L]

Ah, I didn't read that, blame the beer - at 225mm pipework or so, 1200 chambers are what you need.

[jack101]

there is a link in this website for a polypipe civils product showing a plastic version of the concrete rings but i cant find the product on the polypipe website - hopefully someone can advise. thanks

[rab1]

Sean is your man for this one.