Construction forum - Concrete wall question

Author

Concrete wall question

Alpha One

2006-07-18, 5:25 pm

I want to build a concrete wall that is 56.5 ft long and 4 ft high from the
top of the wall to the bottom of the trench, that is, total height including
the footing. The wall will be 10 in wide and the footing will be 20 in wide
by 8 in. (or 10) deep.
It will take 7.5 yards for both the wall and footing. The footing alone will
take about 2 yards. If they bring 7 yards will be chipper that if I order 2
plus 5.
Then, I would have to pour footing and wall at the same time. Would the
concrete stay in the forms up to a height of 4 ft? Or would if flow out
through the bottom?
Also, since the wall slopes by 3.5 ft over 56 ft, will the concrete run to
the lower side?

Than you

sticks

2006-07-19, 3:25 am

Alpha One wrote:
> I want to build a concrete wall that is 56.5 ft long and 4 ft high from the
> top of the wall to the bottom of the trench, that is, total height including
> the footing. The wall will be 10 in wide and the footing will be 20 in wide
> by 8 in. (or 10) deep.
> It will take 7.5 yards for both the wall and footing. The footing alone will
> take about 2 yards. If they bring 7 yards will be chipper that if I order 2
> plus 5.
> Then, I would have to pour footing and wall at the same time. Would the
> concrete stay in the forms up to a height of 4 ft? Or would if flow out
> through the bottom?
> Also, since the wall slopes by 3.5 ft over 56 ft, will the concrete run to
> the lower side?

I'm getting 8.35 yards.
Is the footing going to be stepped?
Is the wall going to be stepped?

You are not experienced enough to try and do this all at once. Not many
people would.
Pour the footer first and see if you can get that right.

sticks

Michael $LS$

2006-07-20, 3:25 am

"sticks" <wolverine01@charter.net> wrote in message
news:oWgvg.220$XR1.122@fe02.lga...
> Alpha One wrote:
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>
> I'm getting 8.35 yards.
> Is the footing going to be stepped?
> Is the wall going to be stepped?
>
> You are not experienced enough to try and do this all at once. Not many
> people would.
> Pour the footer first and see if you can get that right.
>
> sticks

What's the wall for? Have you engineered it? What size/spacing rebar are
you planning on? What's on either side of it? What's on top of it? What's
the soil underneath it like?

Where is this being built? Is there a requirement for inspections? If so,
are there separate footing and wall inspections? If so, is there also a
"pre pour" footing inspection?

You'll need to answer all those questions before any meaningful help can be
given.

Keep in mind, just because you want to do something, doesn't automatically
make it a good idea....

Michael (LS)

Alpha One

2006-07-20, 3:25 am

"Michael (LS)" <NoSpam@MyEmail.com> wrote in message
news:QOCvg.25$PN4.22@tornado.rdc-kc.rr.com...
>
> "sticks" <wolverine01@charter.net> wrote in message
> news:oWgvg.220$XR1.122@fe02.lga...
> the
> including
> wide
> will
> order 2
> to
>
> What's the wall for? Have you engineered it? What size/spacing rebar are
> you planning on? What's on either side of it? What's on top of it?
> What's
> the soil underneath it like?
>
> Where is this being built? Is there a requirement for inspections? If
> so,
> are there separate footing and wall inspections? If so, is there also a
> "pre pour" footing inspection?
>
> You'll need to answer all those questions before any meaningful help can
> be
> given.
>
> Keep in mind, just because you want to do something, doesn't automatically
> make it a good idea....
>
>
> Michael (LS)
>
The wall will be a retaining wall in my backyard. I intend to use three 3/4
rebars orizontaly and vertical ones spaced 2 ft apart, + 2 rebars in the
footing. Nothing will be on the top of it. The soil underneath on one side
is rock for a distance of about 25 ft at a dept of about .75 to 1 ft, and
the other 31 ft is soil never moved (don't know what's called but is not top
soil at all which appeared at a depth of about 1.5 to 2 ft). I understand
because it's only 4 ft high it does not require inspection.

Michael $LS$

2006-07-20, 8:25 pm

"Alpha One" <alphaone@optonline.net> wrote in message
news:t5Fvg.206$FI7.99@fe10.lga...
>
> "Michael (LS)" <NoSpam@MyEmail.com> wrote in message
> news:QOCvg.25$PN4.22@tornado.rdc-kc.rr.com...
from[color=darkred]
in[color=darkred]
alone[color=darkred]
the[color=darkred]
out[color=darkred]
run[color=darkred]
many[color=darkred]
are[color=darkred]
automatically[color=darkred]
> The wall will be a retaining wall in my backyard. I intend to use three
3/4
> rebars orizontaly and vertical ones spaced 2 ft apart, + 2 rebars in the
> footing. Nothing will be on the top of it. The soil underneath on one side
> is rock for a distance of about 25 ft at a dept of about .75 to 1 ft, and
> the other 31 ft is soil never moved (don't know what's called but is not
top
> soil at all which appeared at a depth of about 1.5 to 2 ft). I understand
> because it's only 4 ft high it does not require inspection.
>

I'd double check your not needing an inspection. Where I live it would be
required, and thus why most Landscapers don't do "wet" work (i.e. poured
concrete of any kind).

I won't comment on your "engineering" because without all the info. it's not
prudent to make a recommendation (besides, if it was me I'd have my
Structural Engineer do the math ;- > ).

A couple of additional things that need to be considered: What are you
planning for drainage? Are you putting class 5 (or ?) under your footing?
What are you going to be using for backfill? I re-read your OP and I don't
see where it says what depth the footing will be below grade? What's frost
depth where you're at? How much of this 40" high wall will be above grade?

Also, you'll need to address "sticks" comment about stepping the
footing/wall.

BTW, "soil never moved" is usually called "undisturbed soil" or "undisturbed
grade".

Michael (LS)

solarsell

2006-10-06, 1:25 pm

There's always shotcrete: http://www.monolithic.com/construction/fence/

"Alpha One" <alphaone@optonline.net> wrote in message
news:nRbvg.2605$BB4.1952@fe10.lga...
>I want to build a concrete wall that is 56.5 ft long and 4 ft high from the
> top of the wall to the bottom of the trench, that is, total height
> including
> the footing. The wall will be 10 in wide and the footing will be 20 in
> wide
> by 8 in. (or 10) deep.
> It will take 7.5 yards for both the wall and footing. The footing alone
> will
> take about 2 yards. If they bring 7 yards will be chipper that if I order
> 2
> plus 5.
> Then, I would have to pour footing and wall at the same time. Would the
> concrete stay in the forms up to a height of 4 ft? Or would if flow out
> through the bottom?
> Also, since the wall slopes by 3.5 ft over 56 ft, will the concrete run to
> the lower side?
>
> Than you
>
>

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