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Laying New Drain - questions.

Discussion in 'Plumbing and Central Heating' started by a546345, 12 Jul 2015.

  1. a546345

    a546345

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    We would like to convert part of our conservatory into a utility room, which means digging a new drain. The drain will need to take waste from a sink, and washing machine, but no toilet/shower.

    Plan so far is to dig a trench as per the diagram below, to an existing manhole. Piccie of manhole attached.

    Camarillo Electrical2.png


    Fall will be 1:40
    Plan to then fill trench as follows

    1. 100 mm of pea gravel < 15mm
    2. 110mm plastic soil pipe
    3. 100 mm of pea gravel from top of pipe
    4. backfill


    My questions are

    1. Do I need to provide rodding access at each change in direction (green boxes). If so, do I get a bend with an access port like this? http://www.wickes.co.uk/Wickes-110mm-87-5-Deg-Access-Bend/p/133866. How do I get access to the access port from the surface?

    2. The washing machine will probably connect to a combined trap on the sink, so there will only be 1 40mm waste pipe going into this new drain. How do I bring the 110mm up above ground (red box) and connect the 40mm pipe to it?

    3. How best to do the additional connection into the manhole. The pipe will come from the left. Can the pipe enter the chamber just above the benching on the left hand side?

    I haven't yet spoken to Building Control, but I will do on Monday.

    IMG_20150711_175131.jpg
     
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  3. mfarrow

    mfarrow

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    Why are you doing such a convoluted route instead of just straight down the extension and out the front?

    The changes of direction will need ridding access via a mini chamber.

    For the existing manhole you'll need to look at this and remember you've a foul manhole: http://www.pavingexpert.com/drain05.htm . Is that a dead leg at the top of the picture?
     
  4. a546345

    a546345

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    Hi Mfarrow. The direct route would be through the existing kitchen, so more disruption.

    The top feed into the manhole is from the Kitchen - sink, dishwasher, washing machine.

    The right hand side feed into the manhole is from 2 bathrooms - showers, sinks, toilets.

    So at each change in direction, I need one of these? http://www.screwfix.com/p/floplast-d810-45-inlet-inspection-chamber-base-black/68090

    The inlet is at 45 deg, not 90 deg to the outlet, so I'd also need to put a 45 deg bend on the pipe just before it enters the chamber?
     
  5. PullerGas

    PullerGas

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    If there's a huge difference in the invert levels of the new & existing drains? You could always fit a 'drop shaft' or drop manhole as we'd call it, on the existing manhole. The straight route would be 100 times better as stated.
    HTH
     
  6. mfarrow

    mfarrow

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    Yes that chamber will do. Do a search for ramped rodding points so you don't dig the full depth all the way. Two examples:

    Read the Approved Document for building regulations on Drainage and Waste Disposal (Part H).
     
  7. a546345

    a546345

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    Thanks for the replies, Trench is now dug, and Building Control have been and said ok so far. They're coming back tomorrow evening to see it finished. We have run the internal waste in 40mm not 110mm, and that now pokes out of the wall underneath finished ground level.

    I am not sure what type of gully/hopper to get that will allow the 40mm pipe to flow into the 110mm connection underneath ground level - could anyone post a link to an example please? The BC chap said surface water shouldn't drain into the sewer, but I can only see hoppers and gullies with a grid on top.

    IMG_20150714_172918.jpg
     
  8. mfarrow

    mfarrow

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