Concrete Calculation

[svaurez]

Anyone have the formula for calculating the amount of concrete for a trench in cubic yards?

Example:

500' trench
18" wide
6" cover over 3 2" conduits

[ March 15, 2004, 05:00 PM: Message edited by: svaurez ]

 

[dereckbc]

Re: Concrete Calculation

(H/ft x W/ft x D/ft)/27 = (500 x 1.5 x .5)/27 = 14 cubic yards

[ March 15, 2004, 05:13 PM: Message edited by: dereckbc ]

 

[bennie]

Re: Concrete Calculation

Quick calcs in my head; 14 yards, I would order 2 trucks 18 yards.

 

[bennie]

Re: Concrete Calculation

Honestly, Dereck, I did not read your post before posting mine. Great minds think alike.

 

[dereckbc]

Re: Concrete Calculation

Bennie, what do you do with the extra 4 yards, might be a bit too much for the work truck?

 

[bennie]

Re: Concrete Calculation

Dereck: It's hard to walk a transit mix truck at the proper speed for a 6 inch cover. Plus the cover may be from top of duct.

Most batch plants will supply a make up load when you run a bit short.

A standard mixer truck here, has a 9 yard barrell. The road weight limitation will dictate size of permitted load per truck.

 

[dereckbc]

Re: Concrete Calculation

Bennie, I was joking.

 

[iwire]

Re: Concrete Calculation

I come up with 1.2 yards taken up by the raceways.

 

[hurk27]

Re: Concrete Calculation

Will this help?

Online Concrete Calulator

[ March 15, 2004, 07:27 PM: Message edited by: hurk27 ]

 

[svaurez]

Re: Concrete Calculation

Thanks guys.This site is a goldmine.

 

[svaurez]

Re: Concrete Calculation



[ March 15, 2004, 08:34 PM: Message edited by: svaurez ]

 

[jvaf]

Re: Concrete Calculation

R S Means Electrical Estimating book has a table in the back, which provides you with the amount of concrete required for various duct bank configurations. Maybe you can find an old copy on ebay or the used book sellers at Amazon.com. It sells new for about $100.