Joined: July 2004
||Posted: 22 June 2017,13:01
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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