Need 2" pipe under sidewalk.

Discussion in 'Irrigation' started by jcom, May 25, 2008.

  1. jcom

    jcom LawnSite Senior Member
    Messages: 791

    We need to put 2" poly under a sidewalk and our boring bit for the 255sx is a 2" bit and works fine for 1". I do not envision having to do this again so don't want to buy a 3" bit or larger for this one job.

    I am sure that trying to bore two 2" holes would be a disaster.

    Any ideas to all you boring boring gurus.

  2. Dirty Water

    Dirty Water LawnSite Fanatic
    Messages: 6,794

    How wide is this sidewalk?

    I've dug by hand under 6' sidewalks.
  3. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,756

    It is possible to get away with a length of undersized pipe, if you have enough pressure to overcome an additional loss. How many gpm are going through how long a length of pipe here?
  4. londonrain

    londonrain LawnSite Silver Member
    Messages: 2,129

    Bore it with your 2" bit then beat a piece of 2 1/2 galvanized or sch40/80 PVC with a sledgehammer...or just buy a 3" backreamer so next time you can do a 3" bore unless you are going out of business in the near future... ....

    Messages: 18,668

    We hammer sch 40 pipe through with caps on them. If you are lucky they will have a sand base. If progress is too slow we'll start with a 3/4" sch 40 then step up to an 1 1/4" then go to the 2". We try to avoid water boring but in my early years I used a water pipe I made attached to a hose.
  6. jcom

    jcom LawnSite Senior Member
    Messages: 791

    This is a regular 3' sidewalk. I want to avoid creating a large cavity underneath that will crack and/or settle.

    Maybe it is sledgehammer time. We will try and rent stuff if we are going to use it so intermittently that buying it will end up with something in the corner almost never to be used again.

  7. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,756

    Three feet?!! You could do that with a hand trowel. (and you could probably get by with a smaller diameter for that short a length, if it came down to that)
  8. Dirty Water

    Dirty Water LawnSite Fanatic
    Messages: 6,794

    3' should take someone with a sharpshooter about 30 minutes tops to poke under.

    We never had a bore, I've dug under at least a hundred sidewalks by hand.
  9. AI Inc

    AI Inc LawnSite Fanatic
    Messages: 27,061

    double drill it with your 2 ". Wiggle the shhit out of it once its thru , you will be fine.
  10. WalkGood

    WalkGood LawnSite Bronze Member
    Messages: 1,910

    Three feet? Hand dig that and shove a 6" piece in there as a will take up the space you carefully dug by hand.... just don't go nuts digging a tunnel you can drive thru. Now put your 2" pipe in there and you have room for any future needs (i.e. low voltage wiring, another 2" pipe).

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