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Manhold Cover

Discussion in 'Building' started by oldgarden, 30 Jun 2021.

  1. oldgarden

    oldgarden

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    After getting concrete dug up, the original sized opening for an inspection chamber has been revealed - its rectangular and larger than normal. over 60cm wide and over 90 cm long. How could this be reduced to fit a normal sized rectangular cover?
     
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  3. Alastairreid

    Alastairreid

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    Lintels.
     
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  4. oldgarden

    oldgarden

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    So would the lintels go width ways to reduce the length down to less than 500 say? And if so, if the width (which the long side of the cover would straddle) of the remaining hole is lets say a little less than 600 (I need to check the width) how can you reduce that part, given the lintels would stop you laying another lintel length ways on one side. i.e. how to reduce the manhole on two perpendiular sides - length and width. It needs to take the weight of a car.
     
  5. Alastairreid

    Alastairreid

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    Ever played jenga?
     
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  6. noseall

    noseall

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    How much room (height) do you have to play with? What does the chamber lid look like presently? Piccies would help especially a look at the interior of the chamber (it may be concrete ring biggie).
     
  7. oldgarden

    oldgarden

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    I will take a photo and the measurments
     
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  8. oldgarden

    oldgarden

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    Have attached a photo. So the width is about 510mm and length is about 860mm. The bricks / concrete at the edge of the two long sides are stepped over a little, but only for about two thirds of the length of opening. I presume it would be better to have the cover over the narrower end anyway as that is closer to hole that goes to the sewer away from house and you would still be able to get to the other pipe (from the house). I didnt measure the depth.

    So I guess its good news that the width is 510 as presumably the length of a standard rectangular cover is 600?? So what could be done to support a cover on all four sides? And how could I cover the remaining opening. ANd for it to be safe to drive over.
    Chamber1.jpg
     
  9. noseall

    noseall

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    Stick a pair of 600mm x 450mm chambers over it. :mrgreen:


    Are there any junctions in that chamber?
     
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  11. Ian H

    Ian H

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    Lintel it and put a lid on across the shorter span:
    47BD5CF6-EF62-43A9-9349-8FCBC06B90E6.jpeg
     
  12. oldgarden

    oldgarden

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    Thank you, would some of the concrete / bricks need taking away before putting the lintels in? And similarly would the side of the lid that is not on the bricks be supported / sat on a lintel, so all four side of it are sat on something?
     
  13. Alastairreid

    Alastairreid

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    Take the bricks out to insert the lintels so it all runs level.
     
  14. oldgarden

    oldgarden

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    OK and presumably concrete lintels will take the weight of a call driving over it
     
  15. Alastairreid

    Alastairreid

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    You can buy deeper pre-stressed concrete lintels to suit your needs.
     
  16. oldgarden

    oldgarden

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    OK thank you. Reality is that the manhole will probably sit centrally under the car so wont be actuallu driven directly often, but still want to make it secure. Then will probably get drive gravelled afterwards.
     
  17. oldgarden

    oldgarden

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    ok thanks a lot. Thats really helpful. And will just cover with gravel.
     
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