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Ducting already laid piping

  • 15-01-2019 10:00PM
    #1
    OfflerCrocGod
    Registered Users, Registered Users 2 Posts: 6,336 ✭✭✭


    Would anyone have recommendations for ducting already laid pipes i.e. https://photos.app.goo.gl/vfeLauQ3gd4gNfUN9 or https://imgur.com/a/HP3ZhUo if that link doesn't work. We recently had our heat pump moved and that's why we have these coolant pipes without ducting. I'd prefer to put some ducting over them if possible as opposed to just covering them with earth. Especially as we plan to get a patio path laid over them and the compactor would be running over them in that case.

    Any ideas? I was thinking upside down drain channels but that's hardly ideal...


Comments

  • #2
    dathi
    Registered Users, Registered Users 2 Posts: 1,428 ✭✭✭dathi


    cut a piece of sewer pipe length ways with hand saw or angle grinder, then use wire and duct tape to fix the two halves back together


  • #3
    Gravelly
    Registered Users, Registered Users 2 Posts: 4,119 ✭✭✭Gravelly


    OfflerCrocGod wrote: »
    Would anyone have recommendations for ducting already laid pipes i.e. https://photos.app.goo.gl/vfeLauQ3gd4gNfUN9 or https://imgur.com/a/HP3ZhUo if that link doesn't work. We recently had our heat pump moved and that's why we have these coolant pipes without ducting. I'd prefer to put some ducting over them if possible as opposed to just covering them with earth. Especially as we plan to get a patio path laid over them and the compactor would be running over them in that case.

    Any ideas? I was thinking upside down drain channels but that's hardly ideal...

    Cover them in builders sand to a depth of about 150mm and then put Pipe Buried warning tape on top before backfilling. No point in ducting them.


  • #4
    OfflerCrocGod
    Registered Users, Registered Users 2 Posts: 6,336 ✭✭✭OfflerCrocGod


    dathi wrote: »
    cut a piece of sewer pipe length ways with hand saw or angle grinder, then use wire and duct tape to fix the two halves back together
    Was thinking that but my worry is that with the compactor and time it would fail thus causing subsidence of the path.


  • #5
    OfflerCrocGod
    Registered Users, Registered Users 2 Posts: 6,336 ✭✭✭OfflerCrocGod


    Gravelly wrote: »
    Cover them in builders sand to a depth of about 150mm and then put Pipe Buried warning tape on top before backfilling. No point in ducting them.
    Yes I think this might be the best approach, pity as I would prefer to have ducting but sand should provide a safe buffer. I might put expanding foam into the ducting entry points to prevent sand slowing seeping in over time. Cheers Gravelly and dathi for your help.


  • #6
    CosmicFool
    Registered Users, Registered Users 2 Posts: 492 ✭✭CosmicFool


    OfflerCrocGod wrote: »
    Was thinking that but my worry is that with the compactor and time it would fail thus causing subsidence of the path.

    I'd do the same but instead of duct tape use large strong cable ties to put the ducts back together and put some 804 under them and around them and compact the 804 in with a plate compactor. If you're worried the path will subside you could always use a dry concrete mix on top of the 804 and compact that in too and put warning tape on top


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  • #7
    my3cents
    Closed Accounts Posts: 9,764 ✭✭✭my3cents


    If you cut a length of wavin pipe down just one edge you might be able to slip it over those pipes. If there is too much resistance then use shorter lengths. I've used 45cm lengths as a temporary repair over a punctured drain a few times so I know you can get one length of pipe over another. In this case you could use a layer of short sections over the damaged areas then put another set over the top to cover over the joints. Wear gloves and expect to get fingers pinched - cursing will also be involved.

    Another solution might be to cut a 30mm slot all the way down a length of pipe to make it easier to go around your pipes then cut a length in half and use one half to cover up the slot. That would provide the easy of dathi's solution with a bit more mechanical strength.

    Hope you can find some sense in that somewhere?


  • #8
    OfflerCrocGod
    Registered Users, Registered Users 2 Posts: 6,336 ✭✭✭OfflerCrocGod


    Just to update, I wrapped two pieces of PVC ducting around the piping up to the joint between the new and old piping (just in case piping has to be replaced) and secured it with large hose pipe rings it looks like this https://photos.app.goo.gl/nUHCpUGKNgiTHuk89 or https://imgur.com/a/ITpU2YF I then wrapped the entire thing in DPM to try and prevent subsidence due to earth/sand falling into gaps so it looks like this https://photos.app.goo.gl/FWwuLf9f2qk2kBoz9 or https://imgur.com/a/48JjsZf

    Now I think all I have to do is buy sand and cover everything while making sure any gaps below the DPM are filled in too. I'm in half a mind to use pebble stones instead of sand or maybe a mixture.


  • #9
    my3cents
    Closed Accounts Posts: 9,764 ✭✭✭my3cents


    Use sand but wrap the whole thing in some of that material you can buy for weed suppression. Technically a geotextile separator. Its much stronger than builders plastic and won't let any sand through.


  • #10
    OfflerCrocGod
    Registered Users, Registered Users 2 Posts: 6,336 ✭✭✭OfflerCrocGod


    That's 1200 gauge DPM, would sand really get through? I'd put it on top of 804 and pour concrete over it without a second though. I have geotextile but I figured the DPM would be better for insulation purposes as these are heat pump pipes.


  • #11
    my3cents
    Closed Accounts Posts: 9,764 ✭✭✭my3cents


    OfflerCrocGod wrote: »
    That's 1200 gauge DPM, would sand really get through? I'd put it on top of 804 and pour concrete over it without a second though. I have geotextile but I figured the DPM would be better for insulation purposes as these are heat pump pipes.

    Under ground the DPM is fine but it only lasts about 6 months in the sun. DPM is also a bit stiff and the geotextiles tend to wrap better. Nothing wrong with the DPM but if you have a bit of geotextile then the geotextile will protect it from the sand. Its just belt and braces with a spare belt (and braces).


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  • #12
    OfflerCrocGod
    Registered Users, Registered Users 2 Posts: 6,336 ✭✭✭OfflerCrocGod


    Ah, yes but I'll be covering the piping with sand and then earth, it won't be visible to the sun, it'll be buried underneath a patio path and garden. I might throw some geotextile around it anyway when I'm burying it.


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