scottishjohn Posted July 16, 2020 Share Posted July 16, 2020 I am going build a collection tank on my private suppy as the old stone work culvert from it has collapsed inparts ,so replacing that with 300mm twin wall Ido not knowo exact detals till I dig it up I will try to divert the water ,but suspect diverting all will not be a simple job So what can I use that will set when very wet and or very quickly -- Iunderstand that portland cement sets under water --is that what post mix is made from ? first thing will be the base then i need to construct walls --maybe block work or shuttering and concrete -but again I do not think I will not be able to keep it dry while its setting Link to comment Share on other sites More sharing options...
Cpd Posted July 16, 2020 Share Posted July 16, 2020 https://fosroc.com/product/show/conbextra-uw I have used this on various jobs in Australia. great product 1 Link to comment Share on other sites More sharing options...
scottishjohn Posted July 16, 2020 Author Share Posted July 16, 2020 2 minutes ago, Cpd said: https://fosroc.com/product/show/conbextra-uw I have used this on various jobs in Australia. great product looks like it will be exspnsive for such a simple job--will check Link to comment Share on other sites More sharing options...
Cpd Posted July 16, 2020 Share Posted July 16, 2020 14 minutes ago, scottishjohn said: looks like it will be exspnsive for such a simple job--will check About £15 for a 25 kg bag Link to comment Share on other sites More sharing options...
scottishjohn Posted July 16, 2020 Author Share Posted July 16, 2020 1 minute ago, Cpd said: About £15 for a 25 kg bag and use that to mix up with aggregate for the concrete mix? and just deflect any direct water contact with plywood or something ? Link to comment Share on other sites More sharing options...
scottishjohn Posted July 16, 2020 Author Share Posted July 16, 2020 (edited) looking at uk site -its £20-£40 a bag depending on which ione and it looks like you use it neat --so that would be a lot of bags got to look at diverting the water better I think Edited July 16, 2020 by scottishjohn 1 Link to comment Share on other sites More sharing options...
Onoff Posted July 16, 2020 Share Posted July 16, 2020 I don't think your tank will be properly waterproof if you do the base and walls separate. On big sites I see they do the concrete structure then fit purpose made liners when doing things like sprinkler tanks. Liner needs periodic replacement. To do it your way, even with waterproof concrete I think you need to be incorporating waterbars. For example: https://www.arconsupplies.co.uk/waterproofing/swellable-waterbars You could do it in one hit with a big shuttered and braced box inside a box then pumped concrete. 1 Link to comment Share on other sites More sharing options...
scottishjohn Posted July 16, 2020 Author Share Posted July 16, 2020 Just now, Onoff said: I don't think your tank will be properly waterproof if you do the base and walls separate. On big sites I see they do the concrete structure then fit purpose made liners when doing things like sprinkler tanks. Liner needs periodic replacement. To do it your way, even with waterproof concrete I think you need to be incorporating waterbars. For example: https://www.arconsupplies.co.uk/waterproofing/swellable-waterbars You could do it in one hit with a big shuttered and braced box inside a box then pumped concrete. It don,t need to 100% waterproof as there will be a constant flow and at this time there is no tank just a pile of rocks sending the water towards the old stone culvert there will be no great pressure as the water depth will be only about 2ft before it can run away down a 300mm twin wall drain pipe plus I fear the swellable water bars would swollen before concrete set, the actual water collecting pipes( 50mm)-to a real underground storage tank will be set about 12" from bottom that tank like a rainwater harvesting and will have filter divertor on it to return excess water to the stream lower down whilst removing any large debris and keep a constant flow of fresh water through the tank It is not possible to get concrete jigger to where this is Link to comment Share on other sites More sharing options...
Russell griffiths Posted July 16, 2020 Share Posted July 16, 2020 How about a couple of concrete sewer rings on top of each other. What sort of size is it. 1 1 Link to comment Share on other sites More sharing options...
scottishjohn Posted July 16, 2020 Author Share Posted July 16, 2020 https://www.concretecanvas.com/concretecanvas this might be the answer -- will see what rep has to say on pricing etc . Link to comment Share on other sites More sharing options...
scottishjohn Posted July 16, 2020 Author Share Posted July 16, 2020 (edited) 1 hour ago, Russell griffiths said: How about a couple of concrete sewer rings on top of each other. What sort of size is it. would need to be about 1000mm they will be heavy to manovere --but If ican find 2 or 3 locally and cheap --yes could be deliver from a distance will be the killer Edited July 16, 2020 by scottishjohn Link to comment Share on other sites More sharing options...
scottishjohn Posted July 16, 2020 Author Share Posted July 16, 2020 (edited) 2 hours ago, Russell griffiths said: How about a couple of concrete sewer rings on top of each other. What sort of size is it. not as expensive as ithought 1050x1000mm £149+vat each delivered so that seems like an inspired call by @Russell griffiths good man dig a hole drop them in and add some concrete to the bottom -job nearly done make a 300mm+hole in the side and 2 x50mm ones job done -back fill around Edited July 16, 2020 by scottishjohn Link to comment Share on other sites More sharing options...
Ferdinand Posted July 16, 2020 Share Posted July 16, 2020 5 hours ago, scottishjohn said: I am going build a collection tank on my private suppy as the old stone work culvert from it has collapsed inparts ,so replacing that with 300mm twin wall Ido not knowo exact detals till I dig it up I will try to divert the water ,but suspect diverting all will not be a simple job So what can I use that will set when very wet and or very quickly -- Iunderstand that portland cement sets under water --is that what post mix is made from ? first thing will be the base then i need to construct walls --maybe block work or shuttering and concrete -but again I do not think I will not be able to keep it dry while its setting Do you have a piccie? Link to comment Share on other sites More sharing options...
scottishjohn Posted July 16, 2020 Author Share Posted July 16, 2020 5 minutes ago, Ferdinand said: Do you have a piccie? I will take some next time i,m up there before any new hydraulic engineering takes place and then after Link to comment Share on other sites More sharing options...
Russell griffiths Posted July 16, 2020 Share Posted July 16, 2020 Why not a plastic tank and backfill with concrete. IBC WATER TANK dig a hole 300mm bigger in all directions, drop in tank and concrete all around. But time you buy the concrete you could go and collect two sewer rings. Do you have a trailer ? if it was me I would go to local concrete pipe place and collect a couple of damaged ones. 1 Link to comment Share on other sites More sharing options...
Ferdinand Posted July 16, 2020 Share Posted July 16, 2020 1 minute ago, scottishjohn said: I will take some next time i,m up there before any new hydraulic engineering takes place and then after What I am considering is that there must be versions of big chambers with pre-made inlets. Gonna be difficult to drill, and I am sure I have seen things at my local Buildbase Civils. Ferdinand 1 Link to comment Share on other sites More sharing options...
Gone West Posted July 16, 2020 Share Posted July 16, 2020 (edited) 2 hours ago, scottishjohn said: would need to be about 1000mm I used some 1200mm rings for my well before the borehole was drilled. The only problem is they have a couple of lifting holes in the side but I plugged those with concrete. I core drilled a 127mm hole for the 110mm soil pipe. Edited July 16, 2020 by PeterStarck 1 Link to comment Share on other sites More sharing options...
scottishjohn Posted July 16, 2020 Author Share Posted July 16, 2020 (edited) 19 minutes ago, Russell griffiths said: if it was me I would go to local concrete pipe place and collect a couple of damaged ones. we don,t have those sort of places in the countryside glasgow is 90miles carisle is the same ibc tank is £50-£60 +£50 carriage -ibc tank is too flimsey to attach a 300mm twin wall too so would have to cast into the concrete-then remove the the IBC or at least cut a hole to match I have looked for other solutions and 2 sewer rings looks easiest and cheapest - I will just drill a ring of holes and knock it in for the big pipe then fill in around it once all in place . maybe can rent a 300mm core drill bit --will check Edited July 16, 2020 by scottishjohn Link to comment Share on other sites More sharing options...
scottishjohn Posted July 16, 2020 Author Share Posted July 16, 2020 17 minutes ago, Ferdinand said: What I am considering is that there must be versions of big chambers with pre-made inlets. Gonna be difficult to drill, and I am sure I have seen things at my local Buildbase Civils. Ferdinand post it up if you find anything Link to comment Share on other sites More sharing options...
Cpd Posted July 16, 2020 Share Posted July 16, 2020 (edited) 30 minutes ago, Russell griffiths said: if it was me I would go to local concrete pipe place and collect a couple of damaged ones. I got two from my local BM..... I spotted them at the back of the yard and as they looked like they had been there for some time I offered them £50 for both. They were happy to be rid of them and gave me a lid as well ! They have Built in ladders ... My plan is to use them to make a plunge pool outside my sauna fed from my spring....... all still to be done but hayho I have the basics and they were very cheap., Edited July 16, 2020 by Cpd 1 Link to comment Share on other sites More sharing options...
Cpd Posted July 16, 2020 Share Posted July 16, 2020 22 minutes ago, Ferdinand said: What I am considering is that there must be versions of big chambers with pre-made inlets. Gonna be difficult to drill, and I am sure I have seen things at my local Buildbase Civils. I have a soon to be repaired core drill with 100mm bits that would make quick work of it. pick up rings on a trailer and get another company to drill your holes while on the trailer, will only take a few minutes. Link to comment Share on other sites More sharing options...
scottishjohn Posted July 16, 2020 Author Share Posted July 16, 2020 1 minute ago, Cpd said: I got two from my local BM..... I spotted them at the back of the yard and as they looked like they had been there for some time I offered them £50 for both. They were happy to be rid of them and gave me a little as well ! They have Built in ladders ... My plan is to use them to make a plunge pool outside my sauna fed from my spring....... all still to be done but hayho I have the basics and they were very cheap., yes Iwent looking for them inlocal bulders ,thinking the same -but no luck 1 Link to comment Share on other sites More sharing options...
Ferdinand Posted July 17, 2020 Share Posted July 17, 2020 (edited) This is the page for my local manufacturer Stanton Bonna. https://www.drainagesuperstore.co.uk/product/stanton-bonna-concrete-manhole-ring-900mm-x-250mm.html?gclid=Cj0KCQjw9b_4BRCMARIsADMUIyrploCgoc1DsyiDajsNAVLqPtkVpESrFH_NO7spVi73qwiWxleO4i0aAgkmEALw_wcB I can't think of a better alternative, or honestly a better price than that quoted earlier in the thread. I do wonder about a double lining - that is install fabric plus layers of sand before you pit it in and backfill. It's not the sort of thing you want to redo in 20 years. Edited July 17, 2020 by Ferdinand Link to comment Share on other sites More sharing options...
scottishjohn Posted July 17, 2020 Author Share Posted July 17, 2020 40 minutes ago, Ferdinand said: This is the page for my local manufacturer Stanton Bonna. https://www.drainagesuperstore.co.uk/product/stanton-bonna-concrete-manhole-ring-900mm-x-250mm.html?gclid=Cj0KCQjw9b_4BRCMARIsADMUIyrploCgoc1DsyiDajsNAVLqPtkVpESrFH_NO7spVi73qwiWxleO4i0aAgkmEALw_wcB I can't think of a better alternative, or honestly a better price than that quoted earlier in the thread. I do wonder about a double lining - that is install fabric plus layers of sand before you pit it in and backfill. It's not the sort of thing you want to redo in 20 years. yes isaw them - but at only 250mm long and only 900mmdia and my one is 1000mmx1000mm long --it woud work out more expnsive to get same length Link to comment Share on other sites More sharing options...
scottishjohn Posted July 17, 2020 Author Share Posted July 17, 2020 (edited) 48 minutes ago, Ferdinand said: I do wonder about a double lining - that is install fabric plus layers of sand before you pit it in and backfill. It's not the sort of thing you want to redo in 20 years. I am waitng contact still from the concrete canvas local agent --which still could be an alternative depending on cost make up plywood box --screw the concrete canvas to it fix in 300mm pipe --wrap that with the concrete canvas --then just wet it all and you got a concrete box https://www.concretecanvas.com/concretecanvas they even supply inflatable shelters for miliatary -which you just it over --wet it and you got a semi permanent structure have a look https://www.concretecanvas.com/cc-shelters Edited July 17, 2020 by scottishjohn 1 Link to comment Share on other sites More sharing options...
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