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Hold down bolts question

Discussion in 'Buildings & Infrastructure' started by Gulli, Oct 7, 2018.

  1. fermerboy

    fermerboy Member

    Location:
    Banffshire
    Last ones done here they hammered in a couple of bits of rebar to the right level. Made for easy filling of the hole, till the bar ends were level with crate. Didnt have to faff with level when the mixer was here. And and then they set the plywood on top of them, still used the strings and cross though.
     
    Dyffryn and Robert K like this.
  2. BredRedHfd

    BredRedHfd Member

    Iyf8wqG.jpg
     
    Shavings man likes this.
  3. AJR75

    AJR75 Member

    Location:
    Somerset
    Don't forget to "crack" the bolts the day after the concrete has been poured as well.
     
  4. Robert K

    Robert K Member

    Location:
    Essex
    Like this with the concrete poured around the bolts IMG_20180904_170603818.jpg
     
    wr. likes this.
  5. dannewhouse

    dannewhouse Member

    Location:
    huddersfield
    anyone have the cones move ever so slightly when shaking the bolt box into the concrete?
    latest set I have just used the hole saw to cut a gripping ring in for the edge of the cone, digging the shed Monday so conc tues or wed weather depending.
    the stations are 14" but the bolts are on 200mm centres, seem small to me?
    a 60ft span and the holes are to be 1.2x1.2x1.2 as appose to 1m? seems overkill?
     
  6. dannewhouse

    dannewhouse Member

    Location:
    huddersfield
    they're normally a square hole in washer and a square under the head of the bolt to drive it?
    could have used mole grips and managed surely?
     
  7. Nearly

    Nearly Member

    Location:
    North of York
    Yes but can't push 4 of them into stiff mix concrete. If they're welded together you have a better chance of pushing them in sideways. A wetter mix would have helped. I was just dumper driver on that one.
     
  8. dannewhouse

    dannewhouse Member

    Location:
    huddersfield
    don't you do as above and fasten all 4 to a plywood creating a bolt box?
    I have experienced stiffer conc as you say, (got mixer a bit stuck and by time we had got it out and got round last couple were a bit stiff to shove in)
     
  9. Nearly

    Nearly Member

    Location:
    North of York
    They were on a sheet of ply.
     
  10. BobGreen

    BobGreen Member

    Location:
    Lancs
    Don’t have concrete too stiff Most important is getting string lines set out and checked. Have profiles level so that strings lines are level. This will make check diagonals more accurate. We use tight knots on lines to mark centres also have used crocodile clips as well and a plumb bob down to cross on plywood
    Measure first knot from profile and then knot to knot with steel tape. A long tape has too much sag I find
    We used to set concrete to a level but now find it easier and more accurate to pour concrete, set bolts and take levels below FFL and then make stanchions to fit. Easier cutting steel to the mm then settling concrete
    Finally before concrete sets check all measurements again
     
  11. dannewhouse

    dannewhouse Member

    Location:
    huddersfield
    don't you just get them pretty near and then add an odd piece of steel under baseplate?
     
  12. BobGreen

    BobGreen Member

    Location:
    Lancs
    Still put shims under middle of bases as well. This takes up any discrepancies but main reason for shims is so the post can rock when tightening bolts down to get it plumb in both directions
     
    tinsheet likes this.
  13. Fergieman

    Fergieman Member

    Location:
    Northumberland
    That how our shed builder does it, makes stanchions to suit.
     
  14. Forever Fendt

    Forever Fendt Member

    Location:
    Derbyshire
    We stopped using those waxed cones years ago as they tend to collapse when pushed into the concrete and do not want to stay where you put them, We use 40 mm wast pipe cut to length and assembled on the template they are really strong and do not want to float should the concrete come a bit on the wet side,We have templates folded from 3mm plate with a pin welded on for centres these can be reused time after time and are much better to remove than ply Screen Shot 2018-10-13 at 15.45.01.png
     
    MickMoor, simon-0116, Nearly and 2 others like this.
  15. dannewhouse

    dannewhouse Member

    Location:
    huddersfield
    have seen the pipe idea before.
    don't you get different bolt patterns or do you use same building firm? or specify what bolt pattern you want?
     
  16. Forever Fendt

    Forever Fendt Member

    Location:
    Derbyshire
    Fab all our own buildings, Have templates for 200x200mm M20 bolts and 300x200 M24 bolts depending on the size building ect
     
    Nearly and Farm buy like this.
  17. Farm buy

    Farm buy Member

    We pour the pads and bolt down the stanchions with M20 through bolts .there is always about a ft of concrete over the pads again.
     
  18. Nearly

    Nearly Member

    Location:
    North of York
    Don't give all your secrets away.
     

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