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  1. #1
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    Seriously .... no muckin about .

    We need some proper serious wisdom here and I promise I won't turn it into a Thread.

    Suppose you dig out some 'oles and put in concrete pillars in a proper and serious way.

    Then you realise you actually need another 5 feet . Can you safely and nicely extend them ? Or do you need to dig it all up and start again ?



    Here's the real situation ...............












    Yes it would indeed save lots of time and mess and no doubt the Thais would happily bodge it all to work .
    But I'm not looking to bodge around even though it's not for me so I don't care .

    Can it be done ? Is it done ? Fairly nicely ?

    With thanks from ....


    Wasp

  2. #2
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    I have seen wood posts placed on top of concrete posts all the time at varied heights. I see no reason not doing the same for your required height increase.


    https://encrypted-tbn0.gstatic.com/i...IXHkz4eZJFgZpo
    Last edited by rickschoppers; 05-02-2016 at 05:50 PM.

  3. #3
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    The wood posts can't just sit straight on top hey ? Even the indolent brother wouldn't try that .
    Normal concrete posts are packed with rebar for strength so I can't just sit a wood post straight on top. Some strong fitting method ? Do you know Rick ?


    Wasp

    I wrote this before I saw your photo . That looks lovely but there must be a long steel meat between those boards surely ?.

  4. #4
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    Wasp, If you take a look at the picture there is a steel plate secured to the concrete post. The wood post is then attached to this plate by through bolts.

  5. #5
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    Quote Originally Posted by rickschoppers View Post
    I have seen wood posts placed on top of concrete posts all the time at varied heights. I see no reason not doing the same for your required height increase.


    https://encrypted-tbn0.gstatic.com/i...IXHkz4eZJFgZpo
    Can be a common practice - to extend or just for added strength in particular situations. Wooden beams will almost always be reinforced.

    Personally, I'm from the traditional school of using solid wooden supports [depending on the wood, style, and conditions] over cement and rebar.

  6. #6
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    Quote Originally Posted by rickschoppers View Post
    Wasp, If you take a look at the picture there is a steel plate secured to the concrete post. The wood post is then attached to this plate by through bolts.

    I do love that effect , Rick .

    The more I look the more I think it's set into that concrete base . Great effect . But it may be cheaper to dig 9 holes .


    Wasp

  7. #7
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  8. #8
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    That may be the end of this terrific Thread .

    The more I think about buying steel plates . Buying bolts . Trying to drill though concrete posts that have got rebar running through them ......

    How much is a Pillar ? And how much to pay a guy to dig a hole ?

    I think just looking at these images ......... I like them .
    But as its just for an unappreciative Missy who is happy if the roof just ' looks ' straight at least for 3 years I might as well pay for 9 holes and longer pillars .


    Thanks .



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  9. #9
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    Ffs mate, if you're just going to drop a tin roof on it with no weight, you can extend with timber ( fixed any number of ways)

    No need to re- bore and post.

  10. #10
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    Well can you give me a simple way to attach extensions ?

    That's why I asked the question .


    Wasp

  11. #11
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    Drill holes, add raw bolts. Attach timber supports and re-site current roof.
    I'd also glue rock wool to the underside of the tin roof after installing a frame of 2x2 stud work.
    Then plasterboard over the insulation and install some lights.
    I'd go for 4x2 timber extensions each side of the current columns.
    So 4 raw bolts for each column, 2 either side.

  12. #12
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    What you can do, which the Thais do all the time, is remove the roof, then hammer away at the top of the concrete posts until the concrete has been removed from about the top foot or so of the reinforcing steel, then add more reinforcing steel to the height that you want the new posts to go to (overlapping the one foot of reo that you weld the new reo onto the old). Then box up the reo and pour new concrete to the desired height.
    "The problem with quotes on the Internet is that it is hard to verify their authenticity." - Abe Lincoln.

  13. #13
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    Quote Originally Posted by palexxxx View Post
    What you can do, which the Thais do all the time, is remove the roof, then hammer away at the top of the concrete posts until the concrete has been removed from about the top foot or so of the reinforcing steel, then add more reinforcing steel to the height that you want the new posts to go to (overlapping the one foot of reo that you weld the new reo onto the old). Then box up the reo and pour new concrete to the desired height.

    Thank you Dapper . Sincerely .

    However - palexxx - I like it . Would never have thought of going that way .
    I can see the sense in that approach and of course it's a very Thai way of doing things .

    Might even clad the inside columns with timber to look like solid timber supports .

    My own engineering skills don't extend beyond a tree house and even that leaned over . So I needed to know how to get strength into the pillars - not for the weight of the roof but for a rare gale blowing .

    Thank you . I'm happy with this .


    Wasp

  14. #14
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    I would take the roof off core drill about .125 dia hole into the top about 250mm deep.
    Get some I beam steel stantions made with a base plate and a .225mm shear key on the bottom
    Grout the shear key into the void in the column and resin or mechanical fix the base plate to the column
    I have used this method before on a multi storey building
    Please look at the size of the core in the columns to make sure you can get a bite onto the structural concrete (sizes given as guesswork looking at the columns.)
    I would be wary of breaking down to the rebar, if the rebar is 12mm or bigger , has at least 4 vertical bars and a link that would be the best solution, check one out
    Always go 40x the diameter of the bar for lap length
    E.g. -10 mm bar 400mm
    If you want me to do a sketch I will do one in work tomorrow
    But I am not sure how to upload stuff on here
    Good luck
    Last edited by jimbobs; 06-02-2016 at 02:42 AM.

  15. #15
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    Quote Originally Posted by Dapper View Post
    Ffs mate, if you're just going to drop a tin roof on it with no weight, you can extend with timber ( fixed any number of ways)

    No need to re- bore and post.
    Wind loading mate
    Big problem in the tropics

  16. #16
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    Curious..what material is the lintel the poles are supporting? If it is wood or steel what is wrong with an extension frame thereon like a roof frame with sides..steel would be good then you can dump that middle pillar?

  17. #17
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    Pale X has got it right only he should remove the concrete 500mm from the top of the existing column. As a rule of thumb when you lap the deformed steel bar, lap length should be 50 X steel diameter. Then add formwork to desired height and pour.

  18. #18
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    Quote Originally Posted by jimbobs View Post
    I would take the roof off core drill about .125 dia hole into the top about 250mm deep.
    Get some I beam steel stantions made with a base plate and a .225mm shear key on the bottom
    Grout the shear key into the void in the column and resin or mechanical fix the base plate to the column
    Good luck
    Blimey Jimbobs !!!!

    Now that is what can only be described as a Five Star answer !.

    I may not do it .... though I would enjoy doing it .

    I may not do it because there's no doubt in my mind that when the guys were sent off to buy concrete pillars they would have bought the cheapest ones in the yard .
    Those Roman columns were bought not only for their outstanding beauty but also because they strengthened the pillars.

    Would they stand up to having a .125 hole drilled down into the top ? Added to which only the indolent brother owns a drill . Never used I think . Maximum jaw size about 20 mm .
    All-plastic construction including everything inside . You're supposed to think it's a Hitachi - but it's a Hittshee .
    And he inherited only 4 very blunt Drill bits of which the largest is 8 mm.

    If I was there I'd have decent tools and I'd have a lot of fun trying this work - but the practical answer is to try and get the local guys to take their communal chisel and hammer off the 500mm that Tassini says and try the palexxxx route.

    Thank you very much for taking the time Jimbobs .

    ( If you are able to send a sketch I'm sure others would very much like to look . I certainly would. )



    Wasp

  19. #19
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    The real issue here is: what will happen to the towering Grecco-Roman columns???


  20. #20
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    Tassini is right mate but it's all dependant on the rebar inside the column
    If it's just crap 6mm with no link I would not do it

  21. #21
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    Quote Originally Posted by crepitas View Post
    Curious..what material is the lintel the poles are supporting? If it is wood or steel what is wrong with an extension frame thereon like a roof frame with sides..steel would be good then you can dump that middle pillar?

    crepitty ....... I have to thank you for your suggestion --- but for a totally different reason !

    First let me answer your question ........ here's what's on top of the pillars .






    Looks reassuringly meaty and strong hey ?

    However : I give my thanks because you made me find the answer to a curiosity. Some time ago I saw that a number of photos disappeared from my Thread " Not A House Building Thread ".
    I hadn't deleted them .
    It was really annoying because the disappeared photos made a nonsense of the running commentary. Including the big ' reveal ' at the end .
    Today - to answer your question I went looking for these 2 photos here and I can see they are 2 of those that had disappeared from the Thread .
    And they had actually disappeared from my Photobucket storage !
    I didn't do that . For some reason about 8 pictures have simply evaporated from my account so of course they disappeared from the Thread too .

    I'm at least grateful to see what the problem is - but of course ' Why do photos just disappear from Photobucket like that ? '



    Wasp

  22. #22
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    Quote Originally Posted by Bettyboo View Post
    The real issue here is: what will happen to the towering Grecco-Roman columns???
    How nice to see that name and that avatar again !!

    Makes this Thread worth it !



    Wasp

  23. #23
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    Do you have a plan for the recolumning, Wasp?

    You could call up The Pantheon Antiquities Department for advice before the restructuring. I'm pretty sure they'll be mighty impressed with your missus' column work!

  24. #24
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    With thanks to Tassini and jimbobs and the others ...... crepitas has brought up a new question .

    I had to go looking for old photos and I didn't understand how the original pillars had attached to the crossbeams .

    But I can see in this picture that there are short verticals bolted to the concrete pillars.




    I didn't know it had been done like that .

    Can I remove those short pieces and safely replace them with 1500mm lengths ?

    With a bit of bracing ?

    ( And the added relief for Bettyboo that the RomanoGrecEesan pillars will stay in place ? )

    I think I'm addressing this mainly to jimbobs .



    Wasp?
    Last edited by Wasp; 06-02-2016 at 06:43 PM.

  25. #25
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    Quote Originally Posted by Bettyboo View Post
    Do you have a plan for the recolumning, Wasp?

    You could call up The Pantheon Antiquities Department for advice before the restructuring. I'm pretty sure they'll be mighty impressed with your missus' column work!
    They may be disappointed to lose out here Bettyboo.
    With this newer idea the columns may stay after all and they'll have to go onto the Antiquities World Map of Sights To See if You are Stuck in Eeesan.



    Wasp

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