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Digging a massive hole with a micro digger?

Discussion in 'Building' started by tombodge, 29 Nov 2015.

  1. horseunderwater

    horseunderwater

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    Colin Furze had help from sky tv to build that bunker
     
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  3. tombodge

    tombodge

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    Yeah only in the fourm of cash

    How long would it take to build a whole like that with a mini digger?

    Would there be a cheaper way of making it as in build it out of plywood. Concreat then remove the wood and tank it??
     
  4. horseunderwater

    horseunderwater

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    im not sure plywood shuttering would take the weight of all the concrete without significant support
     
  5. r896neo

    r896neo

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    Don't be discouraged! The world would be dull without madcap projects. Just be full clued up on what your getting yourself into money wise. Nothing as depressing as paying a lot for a massive hole and not having money to finish it.

    As for the hole, if you encounter significant rock a mini digger will be useless. A 5 ton digger with rock hammer would be no problem but the hammer on a mini is very very slow to deal with rock. Even if the ground was perfect I still think you'd be looking at probably 2 weeks for 2 men. As I said the muckaway or skip turnarounds will be a problem.

    As for construction the roof is your biggest issue. Bison slabs craned in might be as cheap as trying to cast in situ with all the materials and prop hire needed, plus the possible going wrong factor.

    Sheet piling the hole might work if you can get a more portable machine to drive them? It would make it safe to dig at your lesuire? Just brainstorming here though have no idea on cost or feasibility, I've only ever seen them rammed with 5t + machine.

    You should speak to an engineer for ball park ideas.

    Contact the guy on the vid, if he made vids about it I'm sure he would mind giving you some pointers, or info on costs
     
  6. bernardgreen

    bernardgreen

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    It is possible to create a large concrete lined hole with minimal use of shuttering. You create the four walls to a height of about 4 foot (*) on the surface of the ground and then excavate under them letting them sink into the ground as you dig. Then you add a few more feet to the walls and dig some more. Repeat until the hole is deep enough for the purpose intended.

    (*) four foot is the size of standard plywood sheet that could be used to mould the walls out of concrete.

    If the ground is very wet then the way to move the soil from the hole to the front of the house could be to use a slurry pump and a large hose through the house.
     
  7. I'm all for alternative thinking but ......... :LOL:
     
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  8. bernardgreen

    bernardgreen

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  9. Yes it did - for the caissons.

    The work involved in casting the wall above ground (complete with more shuttering and rebar than would be needed if it were cast in-situ) , far exceeds anything needed for an in-situ pour. Not to mention the complexity of under-mining the newly cast structure in a controlled manner without potentially catastrophic failure or collapse of the excavation.

    As for pumping the spoil using a slurry pump - the clue is in the name of the suggested equipment. If you're going down that route then simply install a temporary conveyor system through the house!
     
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  11. Depends on your definition of very well - as long as you weren't one of the twenty seven fatalities or indeed the son of the designer who became project director and suffered from decompression sickness as a result of being inside the caissons or indeed the designer himself who died after sustaining a crush injury on the project.
     
  12. noseall

    noseall

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    Don't even consider this with a micro digger, just don't.

    It will be especially miserable in the winter when rain and frost will be caving your trenches in on a daily basis whilst the little micro will be sliding around instead of pulling on soil.

    The hole will have to be dug in such a way as to allow access and the banks will have to be battered etc. It is so not doable and it will take so long with more equipment and lifting and shifting machinery than you can possibly fathom.

    It would be difficult to do in a large open field. To try and do this in a domestic back garden whereby you can only access something as big as a micro digger.....just use your imagination.

    'Bonkers' does not go far enough.
     
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  13. u587162

    u587162

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    Not sure it would survive a missile attack from the air....ruffly speaking of course.
     
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  14. theprinceofdarkness

    theprinceofdarkness

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    If you built the bunker as a circle, then you could use the same method Isambard Kingdom Brunel did for his tunnels. All dug by hand with hardly any machinery. build your circular side wall on the surface in the correct position. When the mortar has cured, remove soil under wall. Wall sinks, dig out soil under wall, repeat and put more bricks on it to get the height back again. If the soil decides to fall back into the hole, the added weight just tightens up the tube of bricks
    Frank
     
  15. tomfe

    tomfe

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    Don't just bury a container they are not strong enough.
    I'd cast a slab with some rebar up the side to take hollow concrete blocks with rebar then lewis type roof with concrete over the top with rebar in as well.
    I do like Colin but he tends to bodge a lot of stuff and I really doubt that shelter would last more than 10 years. Same with the shed he built on top, it was a nice but if he had a little more knowlage it would have been a lot better.

    How about deep concrete piles to retain the earth?
     
  16. endecotp

    endecotp

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    OLD THREAD ALERT!
     
  17. cjard

    cjard

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    First things first, if you're really still keen to try: dig a small hole.. see how full of water it gets.
     
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