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#1
02-16-2007, 12:00 PM
 glo Guest Posts: n/a
linear feet to cubic yards

I need to convert 221 linear feet of concrete into cubic yards, but I have a 18' X 8" in dia. pipe inside the concrete the thickness of the concrete is 2' 9" in thickness.........Please help!!!!!!!!
#2
02-16-2007, 09:38 PM
 gubment_cheez Ultimate Supreme Bacon Cheese Member Join Date: Jan 2007 Location: Sac-o-Tomato, Cowafornia Posts: 354 Rep Power: 8
Re: linear feet to cubic yards

you have to calculate the volume of the concrete, then subtract the volume of the pipe that is inside the volume of concrete
to calculate the volume, you multiply the width, by the depth, by the height
and to get the volume of the pipe you do ((((diameter/2)^2)*pi[3.1415926535897932384626433832795])*length. if the pipe is only partially submerged in the concrete, then the calculation would be different, more complex
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#3
02-16-2007, 09:39 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,467 Rep Power: 13
Re: linear feet to cubic yards

Can you provide a bit more information? If I understand you correctly, you would do something like this:

linear feet * width in feet * thickness in feet = cubic feet

Now you will need to subtract the volume of the pipe.
18 feet * (Pi * (4/12) * (4/12)) = 6.28 cubic feet

cubic feet of cement - 6.28 cubic feet = total cubic feet
#4
02-16-2007, 09:40 PM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,467 Rep Power: 13
Re: linear feet to cubic yards

I guess I just type too much slower than gubment_cheez.

#5
02-16-2007, 09:46 PM
 gubment_cheez Ultimate Supreme Bacon Cheese Member Join Date: Jan 2007 Location: Sac-o-Tomato, Cowafornia Posts: 354 Rep Power: 8
Re: linear feet to cubic yards

Quote:
 Originally Posted by Robert Fogt I guess I just type too much slower than gubment_cheez.
which is why I am campaigning to take over the site. . I will make tax cuts across the board, and give more funding to health, and welfare.
that we hold these truths to be self evident
that all men are created equal, and unique.
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duct tape
duct tape
it's better than glue
fixes stuff
just like new
keep a roll beneath
#6
02-19-2007, 11:17 AM
 glo Guest Posts: n/a
Re: linear feet to cubic yards

Quote:
 Originally Posted by Robert Fogt Can you provide a bit more information? If I understand you correctly, you would do something like this: linear feet * width in feet * thickness in feet = cubic feet Now you will need to subtract the volume of the pipe. 18 feet * (Pi * (4/12) * (4/12)) = 6.28 cubic feet cubic feet of cement - 6.28 cubic feet = total cubic feet

I still don't understand.......what is Pi and why (4/12) what does this mean?
#7
02-23-2007, 08:31 AM
 Robert Fogt Administrator Join Date: Dec 2005 Location: Seattle, WA Posts: 3,467 Rep Power: 13
Re: linear feet to cubic yards

Quote:
 Originally Posted by glo I still don't understand.......what is Pi and why (4/12) what does this mean?
Pi is a mathmatical concept, it is the relationship of a circles radius to its circumference. It is a number equal to about 3.14, or some calculators give more accuracy up to about 3.1415926535897932384626433832795

4 is inches, and 4/12 is a quick way to convert it to feet. Since all units need to be the same, for example cant multiply feet by inches, only feet by feet.

4 inches / 12 = 4/12 = 0.333 feet
18 feet * (3.14 * 0.333 feet * 0.333 feet) = 6.28 cubic feet

But that is only the volume of the pipe. You subtract that volume from the volume of the cement, and you cant calculate that until you know the width.

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