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  1. #401
    Quote Originally Posted by gravesendkoi View Post
    https://www.diy.com/departments/u-ca...SABEgL4WfD_BwE

    Can you not cut out the damaged part of the collar and use a couple of tubs of this in with concrete mix.
    This is quick setting agent which may or may not set the concrete quicker
    gravesend and Dartford have this in stock

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  3. #402
    Senior Member Rank = Mature Champion RS2OOO's Avatar
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    There definitely are agents as I use them at work but on an industrial scale so can't really bring it home.
    We pour cement and it's solid within 30 minutes. After 2 hours the compressive strength is 24 N/mm2 which means nothing to me but the span will take 300+ tonnes in weight.

    Sadly I'm working every day including weekends till mid October with only days off to switch between night and day shifts.

    My mate will lend me his Grinder and cutting discs, just got to arrange it.

    My thinking is now heading back to the idea of cutting horizontal slots along the footing and slotting rebar in and then making good. If it works out would be the quickest, easiest and cleanest of all the repair options. Very similar to the Helifix method but much stronger.

    Sent from my Pixel 2 using Tapatalk

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  5. #403
    Senior Member Rank = Mature Champion RS2OOO's Avatar
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    Quote Originally Posted by gravesendkoi View Post
    gravesend and Dartford have this in stock
    I'm going to buy that, thanks.



    Sent from my Pixel 2 using Tapatalk

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  7. #404
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Quote Originally Posted by Frimley Koi keeper View Post
    Just get back to your socket lids Fred as I am sure you have some to leave open
    All open mate always. Let the air get to them lol. Sleeper Pond Extension!Sleeper Pond Extension!Sleeper Pond Extension!

    Sent from my SM-G960F using Tapatalk

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  9. #405
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Good luck with it mate what ever you decide on.

    Sent from my SM-G960F using Tapatalk

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  11. #406
    Senior Member Rank = Mature Champion RS2OOO's Avatar
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    Wanted to make a start today, but had work on the phone all morning even though I'm on nights tonight and now it's too late to start anything serious.

    So to tide me over I injected this stuff into the cracks:

    https://www.toolstation.com/fischer-...kaAglrEALw_wcB

    I didn't think it would do much but within 15 minutes it has set absolutely solid. I used a spatula to help push it deep into the crack and the spatula got stuck solid and I had to leave it in there and cut the end off.

    By the time I finished messing around trying to get the spatula out, the last bit in the tube the had gone rock solid.

    If the collar cracks again with this stuff in there then the forces against it must be incredible.

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  13. #407
    I hope it holds for you RS.
    laters

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  15. #408
    Senior Member Rank = Gosai Sim's Avatar
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    Quote Originally Posted by RS2OOO View Post
    Pond seems to have developed a structural problem.

    The concrete collar is around 5-6" deep all round the pond except for the end of the pond where it is approx. 12" deep due to the slightly sloping garden.

    A crack developed on the left hand side soon after the pond was built and this crack is very close to a piece of vertical rebar so I've never been that concerned.

    A 2nd crack has suddenly developed on the right hand side of the pond and goes all the way through the collar (back to front, top to bottom - literally splitting the collar into 2 pieces). This crack is around 12" away from the nearest piece of vertical rebar.



    Full width pond view where you can make out a crack on the left side and another on the right side of the concrete collar. The concrete between the 2 cracks has been pushed outwards around 1/4" despite the fact the rebar is also in between the 2 cracks, i.e the main section that has moved also contains 1m x 16mm vertical rebars:

    Attachment 29483



    This is the new crack on the right hand side:
    Attachment 29482


    This is the old crack on the left hand side that I'm not too concerned about:
    Attachment 29481


    The pond is fitted with a box liner and you can see a step where the box liner has moved with the concrete collar.

    I'm not sure how seriously I need to take this and how urgently a repair is needed. I have no time off work between now and a 2 week holiday which adds to the worry.

    Would be grateful if someone can advise if my repair plans are viable:

    1) Temporary repair to last till Spring:
    Lower pond water to below concrete collar.
    Lift back liner.
    Inject industrial resin concrete repair into the cracks from both the pond side and the outside.
    If no further movement occurs between now and spring, I will render, re-paint and just monitor it.


    2) Permanent repair
    Lower pond water to below concrete collar
    Lift back liner
    Leave sleepers in situ.
    Cut a 1 foot square section of concrete with a concrete cutting disc and dispose.
    Drill holes in the adjacent sides of the collar and screw in large heavy duty bolts that are sticking out into the void.
    Fit shuttering to the collar and refill the hole with cement (mixed in with PVA / Resin etc to help it bond to adjacent concrete).

    No.2 won't be as easy as it sounds what with the sleepers being left in situ - I'll add shuttering in sections so I can compact the cement down, then once I get near the top I'll have to push it through the "letterbox" between shuttering and sleeper.


    There are no signs of any stress on any other part of the concrete collar so I assume its due to the fact the size of this part of the collar has caused it to become a structural part of the pond.


    Any thoughts?

    Do you think option 1 is a waste of time or could it work?

    What would you do?

    Thanks.
    Sorry to hear rs only just reading through.

    I extended the wall on my pond, when joining the new shuttered and poured concrete wall I did the following.

    I roughed up the old concrete wall and then drilled holes into it, I then used resin and bonded rebar into it.
    I also wire mesh into the middle of the wall as well.
    I wet the old wall just before the pour and has work fine.
    May work for you on your pond, you could also dig out under the old concrete to help strengthen the repair.

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  17. #409
    Senior Member Rank = Mature Champion RS2OOO's Avatar
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    Thanks Sim.

    This is exactly the repair that's been running through my mind.

    Need to take the water level quite low as will need digging for the extra footing extension.

    Thinking of extending the footing out by 6" and then paint it and use it as a shelf for plant pots etc.

    Sent from my Pixel 2 using Tapatalk

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  19. #410
    RS you are missing a trick here as you could use this repair to extend your pond

    I've already put the shovel and pick in the car so you just need to decide if you want to extend by 4ft, 6ft or 10ft and I'll be round later to make a start OK

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  21. #411
    Extreme Koi Member Rank = Grand Champion john1's Avatar
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    Quote Originally Posted by Frimley Koi keeper View Post
    RS you are missing a trick here as you could use this repair to extend your pond

    I've already put the shovel and pick in the car so you just need to decide if you want to extend by 4ft, 6ft or 10ft and I'll be round later to make a start OK
    Cant refuse that offer Rs.
    Hope it works for you mate the shelf idea sounds good with plenty of rebar.
    John

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  23. #412
    Quote Originally Posted by Frimley Koi keeper View Post
    RS you are missing a trick here as you could use this repair to extend your pond

    I've already put the shovel and pick in the car so you just need to decide if you want to extend by 4ft, 6ft or 10ft and I'll be round later to make a start OK
    What a offer that is. I wish I had that offer when I dug my first pond.

    I think you you will have to re-consider.

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  25. #413
    Quote Originally Posted by john1 View Post
    Cant refuse that offer Rs.
    Hope it works for you mate the shelf idea sounds good with plenty of rebar.
    Plenty of coffee too or the deal's off lol

    And decafe's not proper coffee BTW

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  27. #414
    Quote Originally Posted by gravesendkoi View Post
    What a offer that is. I wish I had that offer when I dug my first pond.

    I think you you will have to re-consider.
    Me and my big mouth

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  29. #415
    Senior Member Rank = Mature Champion RS2OOO's Avatar
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    Quote Originally Posted by Frimley Koi keeper View Post
    Plenty of coffee too or the deal's off lol

    And decafe's not proper coffee BTW
    Only have decaf... And it's probably 2 years out of date as only person who drinks it is my mum when she visits once a fortnight!

    Don't you worry.... The extension idea has been playing on my mind, but I can't go through that all over again. If I did extend, it would be downwards to increase volume.

    Sent from my Pixel 2 using Tapatalk

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  31. #416
    Quote Originally Posted by RS2OOO View Post
    Only have decaf... And it's probably 2 years out of date as only person who drinks it is my mum when she visits once a fortnight!

    Don't you worry.... The extension idea has been playing on my mind, but I can't go through that all over again. If I did extend, it would be downwards to increase volume.

    Sent from my Pixel 2 using Tapatalk
    Just think if you did decide to extend again you could start another thread, sleeper pond extension 2 - this time it's urgent

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  33. #417
    Probably still get it done before my QT even if you started after Christmas.

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  35. #418
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Quote Originally Posted by Frimley Koi keeper View Post
    Me and my big mouth
    Haha brill

    Sent from my SM-G960F using Tapatalk

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  37. #419
    Senior Member Rank = Mature Champion RS2OOO's Avatar
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    24 hours since resin injection and its held solid.

    Not sure if I can risk leaving it at that for a while or not.

    Doesn't help not knowing exactly when the movement occurred, but have now found a photo from mid-July and a crack is visible in that picture as well. There is definitely no crack in photos from April.

    Might end up not going on holiday anyway, as its booked with Thomas Cook. But for some reason it doesn't excite me that I might be able to stay at home and repair the cracked pond instead!!!

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  39. #420
    We’ll all keep our fingers crossed for the pond and Thomas Cook!

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