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Help - Cant lift recessed manhole cover

Discussion in 'Building' started by alp078, 6 May 2011.

  1. alp078

    alp078

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    Hi

    I need to investigate a blocked drain to see if I can resolve it myself before resorting to calling in a pro, but I can't lift the recessed cover in my garden. I can access the lifting keys no problem, but it won't budge. Two of us have tried lifting and the weight (even with slabs inset) should be quite manageable.

    I am assuming that possibly some sand/cement mix or other debris has bonded the tray to the rubber seal. I have tried to seperate the seal by running a fine blade right around the edge, have tapped vigorously all over with a rubber mallet to to try and loosed things up and nothing seems to be working. My next thought is to resort to getting the angle grinder out and cutting the slabs in the tray so I can lever them out.

    Anyone have any ideas/advice. I am concerned at damaging the tray/seal and want to avoid shelling out on hiring a hydraulic lifter.

    Thanks
    Alp
     
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  3. wavetrain

    wavetrain

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    Is it one of those covers that has block paving inside? If so, remove the paving blocks from it and try again.
     
  4. alp078

    alp078

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    it is, but they are not loose set, they are cemented in - hence the need to get the angle grinder out to run through the joins and try to level them up.

    Looks like this might be the best thing to try next.

    Cheers
     
  5. wavetrain

    wavetrain

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    I only raised this point, as once I tried, and failed to lift one of those covers. It may be that the cover becomes jammed by sand etc getting lodged. Then, with the bricks in the cover, it is largely incompressible. The result - very difficult to lift by humans.

    If you are handy, you could fabricate a hook/lever that may lift it?

    You could also try hitting it with a club hammer to shake it up a tad and see if that helps?
     
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  7. ^woody^

    ^woody^

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    Spray some WD 40 around the joint between frame and cover.

    You also need to lift this vertically, so may need special manhole keys (or a bent bit of metal) rather than a shovel down the side of the frame

    When you put the lid back, grease the side of the frame first
     
  8. mctav

    mctav

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    My driveway cover got stuck recently, after much wrestling I had to knock a screwdriver and a chisel down between the lid and the frame to lever the one end up. Once the seal broke I managed to lift the cover out, I did knock the sides of the frame about though.
     
  9. alp078

    alp078

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    Cheers guys, looks like i will have to try a strong arm approach and try to get something in between the seal and tray edge to lever it up. Feels stuck fast though, so not sure how successful i'll be. I've give a good spray with WD40 which should have had time to work by now.

    Fingers crossed.
     
  10. meadowhog

    meadowhog

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    I had a similar problem with an old 2" thick cast iron jobby over a big manhole. After spending a day with a hammer and broken 1" hacksaw blade I managed to clear out most of the rust. I then dropped in a couple of 16mm nuts into the key holes. i used two so they would jam each other in. Then I used a thick bar with hole in it and layed over the manhole cover so the hole lined up with one of the nuts. I then fitted a bolt through the bar and into one of the nuts. The bar over hung the cover by about 6" and I managed to get a 5 ton machine jack under the bar. Then hanging onto the end of a weight lifting bar used as a lever, the cover slowly came up.

    Maybe something like this would work. I doubt you need that kind of power but a car jack or long lever would probably work.
     
  11. DIYnot Local

    DIYnot Local

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