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  #1   IP: 86.139.93.181
Old 07-03-2017, 10:24 AM
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Local Diggers Local Diggers is offline
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Default formwork techniques

need some advice form men in the know please.

we are constructing a concrete retaining wall thats set on a very large toe foundation.

my question is this: once the formwork is constructed and in place then poured, we have no access to the rear of the retaining wall, so my ply etc will have to stay in behind. but how do i remove my dywidag bolts and plates afterwards? is there a technique? a sacrificial system?

if not, will i still be able to remove the threaded bar from the one side somehow? or is it a case of beating it back in to my wall and then plug it up?

any advice much appreciated
dan
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  #2   IP: 86.157.80.119
Old 07-03-2017, 11:11 AM
mart1602 mart1602 is offline
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Default Re: formwork techniques

can you put some rope or wire on your plates and fix to the top of the shuttering then put a double locking nut on your threaded bar and wind them out undoing the nut on the inside against the ply,loosing the nuts wont be the end of the world
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  #3   IP: 46.9.247.184
Old 07-03-2017, 11:32 AM
Bucket on wheels Bucket on wheels is offline
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Default Re: formwork techniques

Hi
I do not know if this system is used in the UK.

Here in Norway is it used everywhere

it is easy and quick to use

If it looks interesting so let me know and I can look for more detailed info







you break off the bars at number 6 after the shuttering plates are taken away

Drawing explanation:

1. Steel Disc swaged on stag.
2. Wedge of cast iron (M-key).
3. lath, for example. 48 x 98 mm.
* Other dimensions can also be used.
4. log (studs) for example. 36 x 98 mm.
* Other dimensions can also be used.
5. "Skin", board or plywood.
6. Plastic cone ensures correct wall thickness.



they are broken off by bent back and forth a few times

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Last edited by Bucket on wheels; 07-03-2017 at 01:25 PM.
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Old 07-03-2017, 05:52 PM
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Default Re: formwork techniques

Why's there no access Dan is it against a bank or piles ?
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  #5   IP: 86.139.93.181
Old 07-03-2017, 07:22 PM
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Default Re: formwork techniques

hi lads thanks for replies so far, interesting, the reason is because theres a building behind it, imagine we are removing 2m of spoil and this wall is our clients protection, its made even weirder that the building is illegal and due to be demolished but council have never forced the action.so our new wall will stop at neighbours top of foundation which is what is stopping our access once poured
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Old 07-03-2017, 08:25 PM
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Default Re: formwork techniques

Quote:
Originally Posted by Local Diggers View Post
so our new wall will stop at neighbours top of foundation which is what is stopping our access once poured
Sounds like a bargepole job IMHO, but we have one similar later this year. Lots of disclaimers and paperwork in case the house above shifted slightly
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  #7   IP: 31.53.231.47
Old 07-03-2017, 08:40 PM
quattromike quattromike is offline
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Default Re: formwork techniques

Do you need to get the rods out? If you use m12 stud bar all over to keep shape then once concrete set just unbolt the side you can reach and remove the shuttering and cut the rod flush with the wall. Or like already mentioned fit the rods with cutting of alkathene pipe the length you want the form width to be and fit with studs through them bolting all together then remove from one side and have ropes to pull out them remains behind the wall.
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Old 07-03-2017, 09:37 PM
Davejcb Davejcb is offline
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Default Re: formwork techniques

Without seeing a drawing I'm not sure why you need ply on the side up to the building? Can't you just shutter the face up, i.e. No through rods ?
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  #9   IP: 86.139.93.181
Old 07-03-2017, 09:38 PM
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Default Re: formwork techniques

rory, pics will follow, footing plus 1.8m of soil beneath has been exposed for aprox 3 years to date. its a mess.

mike thanks.
so far my plan is to screw wire to the nuts to hold them in place, sacrifice the waler plates and nuts, try and unscrew the dywidags. failing that tap them back through and plug as normal.
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Old 07-03-2017, 09:53 PM
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Default Re: formwork techniques

we used to use plastic overflow pipe to run the bolts through and set the gap between the shuttering
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