Concrete Plank vs Precasting ???
Concrete Plank vs Precasting ???
(OP)
I'll start off by saying I most of my design work in steel structures & isolated footings
I have a project where I may potentially need to span a ~20' wide utility 'trench' that is to be cut in what is basically solid concrete.
The area may require some tow motor/ vehicular traffic.
I was thinking about cutting a "shelf" into the existing mass concrete (this same mass concrete is being excavated to make the 'trench') and then bridging this with concrete planks or precast beams (panels) that could be removed, if necessary, by cranes in the area. This would allow me to leave an open accessible area for the utilities.
Any pitfalls with this idea?
I have never specified plank
Pitfalls to precast beams/panels?
Hope the post isn't too vague
I have a project where I may potentially need to span a ~20' wide utility 'trench' that is to be cut in what is basically solid concrete.
The area may require some tow motor/ vehicular traffic.
I was thinking about cutting a "shelf" into the existing mass concrete (this same mass concrete is being excavated to make the 'trench') and then bridging this with concrete planks or precast beams (panels) that could be removed, if necessary, by cranes in the area. This would allow me to leave an open accessible area for the utilities.
Any pitfalls with this idea?
I have never specified plank
Pitfalls to precast beams/panels?
Hope the post isn't too vague






RE: Concrete Plank vs Precasting ???
Mike McCann
MMC Engineering
RE: Concrete Plank vs Precasting ???
CDF ?
Like lean concrete?
RE: Concrete Plank vs Precasting ???
Mike McCann
MMC Engineering
RE: Concrete Plank vs Precasting ???
anyway to test the strength or just a bad idea all around?
RE: Concrete Plank vs Precasting ???
Rather than cut a shelf, I guess I could tear the CDF out wider and pour a new wall down to the slab?
RE: Concrete Plank vs Precasting ???
Do you know for sure that it is CDF? If not, test with a portable tester it to see what the f'c rating is.
Mike McCann
MMC Engineering
RE: Concrete Plank vs Precasting ???
RE: Concrete Plank vs Precasting ???
Do you just design it like a normal beam/slab?
RE: Concrete Plank vs Precasting ???
They can cast this on site or in a pre-caster's yard. Design as pinned-pinned.
Call for cast in place inserts so when this needs to be removed, they can screw in eyebolts or hooks and lift the slab out. Make sure you have top steel for the lifting process.
RE: Concrete Plank vs Precasting ???
RE: Concrete Plank vs Precasting ???
RE: Concrete Plank vs Precasting ???
RE: Concrete Plank vs Precasting ???
Its outside
I was thinking long term
Not much depth to work with so steel beams with concrete deck might be too deep?
RE: Concrete Plank vs Precasting ???
RE: Concrete Plank vs Precasting ???
I am hoping to keep the system to 12" in height