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How to fill a big hole round soil pipe externally

Discussion in 'Building' started by rob7475, 23 Mar 2017.

  1. rob7475

    rob7475

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    I've had to lift a paving slab at the front ofy house today for a gas meter move. This brought all the mortar from around the soil pipe leaving a massive gap. Under the gap is hollow (theres a cellar there) so dont know how they originally filled this big gap. Can anyone suggest how i'd go about filling this?
     

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  3. oldbutnotdead

    oldbutnotdead

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    Can you get to the underneath of the pipe? If you can then shutter under, mortar above (and then if you've got the room I'd put a Wendy house above the mortar to keep the worst of the rain off it). All sorts of other options, depends what is in that void into which the pipe disappears
     
  4. How deep is the "hole". You'd want to end up with about 6" of concrete (ballast and cement) to form a solid platform, so if the hole goes down too deep, then you need to find a way of plugging it (stuff it with cardboard etc, and then put a first thin layer of concrete down the hole, then fill to the top on the second go. You can cover the concrete with plastic if it's likely to rain, and a few layers of cardboard etc if there's a risk of frost.
     
  5. ^woody^

    ^woody^

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    Mesh, then concrete.
     
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  6. rob7475

    rob7475

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    The holes about 6ft deep (its an old blocked off cellar underneath)

    What sort of mesh would be best to cover it with before concreting over?

    Thanks
     
  7. Ian H

    Ian H

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    Is the underground section of the drain fixed to the wall in the cellar?
     
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  9. rob7475

    rob7475

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    I think it is, why?
     
  10. Ian H

    Ian H

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    It just seems odd that there is a cellar under the soil stack. Surely it would have more of a structure to its roof/ceiling?

    If I saw that I'd think you had a leaking clay joint on the drain that had washed the ground away around the pipe.

    Could be worth someone flushing while you look down the hole with a torch.
     
  11. rob7475

    rob7475

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    Its plastic pipe.

    I had to lift the paving slab yesterday and was shocked when to find half of it was only supported by a wall in the cellar below. There was a 2ft by 2ft hole under the slab into the cellar.
     
  12. Ian H

    Ian H

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    I'd be tempted to pour in 10mm pea gravel to fill the void.
     
  13. So you can't get into the cellar, and have to work from above. You can't just pour concrete in the hole (or pea shingle either) and need to find a way of putting something down the hole that will support the concrete that you then pour in. Looking at the second picture, you need to put something down the hole tied to a piece of string, that you can then pull back up into place and tie it off somewhere, then pour the concrete in.
     
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