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How do they build the retaining walls for really deep excavations

  • 04-05-2019 12:13am
    #1
    Donald Trump
    Registered Users, Registered Users 2 Posts: 20,823 ✭✭✭✭


    Question for civil/construction engineers


    This video came up in my youtube feed. Had a look at it.






    Question I want to ask is how/when do they put in those retaining walls around the hole


Comments

  • #2
    annfield1978
    Registered Users, Registered Users 2 Posts: 571 ✭✭✭annfield1978


    https://www.youtube.com/watch?v=AgBe7tQWCf0


  • #3
    godtabh
    Moderators, Science, Health & Environment Moderators Posts: 23,243 Mod ✭✭✭✭godtabh


    Or secant pile it and excavate (which actually looks like what they did there)


  • #4
    Turbulent Bill
    Registered Users, Registered Users 2 Posts: 1,638 ✭✭✭Turbulent Bill


    Donald, I thought you'd already be expert at building walls? ;)


  • #5
    mickdw
    Registered Users, Registered Users 2 Posts: 23,686 ✭✭✭✭mickdw


    Typically circular bores are augured out along the line of excavation to required depth, these are filled with reinforced concrete and process repeated til a complete wall is created.
    It's a bit more complex than that requiring accurate position with interlocking bores etc but that is the basics of it.


  • #6
    Donald Trump
    Registered Users, Registered Users 2 Posts: 20,823 ✭✭✭✭Donald Trump


    Turbulent Bill wrote: »
    Donald, I thought you'd already be expert at building walls? ;)




    I only build them up, not down.


    But I have recently discovered that Mexicans own both ladders and spades! Crafty little divils so they are


    One of these really deep jobs would soften their coughs fairly lively :pac:


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  • #7
    Donald Trump
    Registered Users, Registered Users 2 Posts: 20,823 ✭✭✭✭Donald Trump


    mickdw wrote: »
    Typically circular bores are augured out along the line of excavation to required depth, these are filled with reinforced concrete and process repeated til a complete wall is created.
    It's a bit more complex than that requiring accurate position with interlocking bores etc but that is the basics of it.




    I saw a video online after the other fella mentioned secant bores. I have seen those "rounded" walls on various sites in the past. The one above is deeper though and then it also looks smooth so I thought there still might be something more.



    For the one where they dig the big piles, it must be fairly difficult to line them up? If you are going 100 foot deep, then to be exact at the bottom of that (i.e. parallel to the adjacent pile) must be extremely difficult. And surely they must then link the piles together for strength? Else you just have a heap of individual 100 foot high columns. Maybe they just attach them in to the soil/rock as they go down digging out the actual hole?


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