Diy concrete panels?

[devonbeef]

Hi has any body successfully cast 4" thick panel at 4 ft high at 15 ft length.
Have awkward spot for some was thinking it might be a option to make some on the concrete ground beside area to be walled.
Was thinking a 4 x 2 frame with 16 mm rebar generously spaced through out with lifting eyes on a thicker length nearer top ,possibly welded together then pour and poker it.length of plygene on floor to make it smooth.
Any body done it? Did it Work?

 

[DrDunc]

Hi has any body successfully cast 4" thick panel at 4 ft high at 15 ft length.
Have awkward spot for some was thinking it might be a option to make some on the concrete ground beside area to be walled.
Was thinking a 4 x 2 frame with 16 mm rebar generously spaced through out with lifting eyes on a thicker length nearer top ,possibly welded together then pour and poker it.length of plygene on floor to make it smooth.
Any body done it? Did it Work?

Would it not be easier to cast them in situ?

I've a neighbour who could get ballast free from the quarry. Painted the shuttering with oil for easy release. Rebar mesh inside shuttering, and clamp bolts were through alkethene pipe. They used a pan mixer, but without asking I don't know how the filled the shutter

 

[Lazy Eric]

Hi has any body successfully cast 4" thick panel at 4 ft high at 15 ft length.
Have awkward spot for some was thinking it might be a option to make some on the concrete ground beside area to be walled.
Was thinking a 4 x 2 frame with 16 mm rebar generously spaced through out with lifting eyes on a thicker length nearer top ,possibly welded together then pour and poker it.length of plygene on floor to make it smooth.
Any body done it? Did it Work?

The rebar has to be under considerable tension for the panels to have strength, that’s your only problem.

 

[upnortheast]

Hi has any body successfully cast 4" thick panel at 4 ft high at 15 ft length.
Have awkward spot for some was thinking it might be a option to make some on the concrete ground beside area to be walled.
Was thinking a 4 x 2 frame with 16 mm rebar generously spaced through out with lifting eyes on a thicker length nearer top ,possibly welded together then pour and poker it.length of plygene on floor to make it smooth.
Any body done it? Did it Work?

Made similar to create a cover for a septic tank. Very easy to do
Someone near here did silage pit panels like that. Must be over 20 years ago & they are still there & looking good.

 

[devonbeef]

How do you mean under considerable tension? Should you do something other than just have them in the centre of the cast?

The rebar has to be under considerable tension for the panels to have strength, that’s your only problem.

 

[devonbeef]

Would do that cast in sit, but it s very permanent and not sure if it might be moved else ware in future.

Would it not be easier to cast them in situ?

I've a neighbour who could get ballast free from the quarry. Painted the shuttering with oil for easy release. Rebar mesh inside shuttering, and clamp bolts were through alkethene pipe. They used a pan mixer, but without asking I don't know how the filled the shutter

 

[wr.]

 

[jamesy]

Cast a lid on the ground for a mixing point on slats except it was 7”x 3” we used plenty of rebar then lifted in place a few weeks later

 

[jamesy]

Is it not wire under tension in the prestressed panels?

 

[thorpe]

why pizz about when you can order to lenght and get abetter job and prob cheaper?

 

[devonbeef]

Thank you for putting that on.It appears that the wires are lead into casts then tension ed before the concrete is poured.When set i presume just cut of flush.
I can,t see that rebar if held in place would be any less strained , tension-ed than those wires, would you?

 

[wr.]

Thank you for putting that on.It appears that the wires are lead into casts then tension ed before the concrete is poured.When set i presume just cut of flush.
I can,t see that rebar if held in place would be any less strained , tension-ed than those wires, would you?

When the wires are cut, they try to pull the concrete together if you know what I mean. This has a different effect to just laying rebar in the cast
Give a good concrete panel a tap with a hammer and it rings.

 

[devonbeef]

When the wires are cut, they try to pull the concrete together if you know what I mean. This has a different effect to just laying rebar in the cast
Give a good concrete panel a tap with a hammer and it rings.

maybe not a good idea making them then, block up or buy panels then . cheers

 

[thorpe]

maybe not a good idea making them then, block up or buy panels then . cheers

for get blocks!

 

[Zebbedee]

I,m pretty sure those wires have a huge tension on then 50 tonnes odd I,m guessing at proper figure but suffice to say more to it than just casting a slab also if you notice most panels have a slight bend in them facing into load side eg inside of shed

 

[bkg]

I,m pretty sure those wires have a huge tension on then 50 tonnes odd I,m guessing at proper figure but suffice to say more to it than just casting a slab also if you notice most panels have a slight bend in them facing into load side eg inside of shed

150 on a jig i saw, but the jig was over 200ft long.

 

[Bury the Trash]

why pizz about when you can order to lenght and get abetter job and prob cheaper?

But wheres the fun in that

Prestressed wouldn't be so necessary if there wasn't a load or anything like it against the panel? What i mean is surely it depends on type of use for the building .

 

[Grass And Grain]

We just used reinforcing mesh. 6" thick panels though. Haven't cracked.

 

[Forever Fendt]

When the wires are cut, they try to pull the concrete together if you know what I mean. This has a different effect to just laying rebar in the cast
Give a good concrete panel a tap with a hammer and it rings.

As you say the wires are put into tension so when the concrete is cured the wires are released this puts the concrete into compression and this is where concrete performs best in compression

 

[devonbeef]

150 on a jig i saw, but the jig was over 200ft long.

you would,nt want a wire to snap when in casting shed,quite a ping.