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PreSlab Construction

PreSlab Construction

PreSlab Construction

(OP)
Got asn old Days Inn from circa 1958 that is owned by another chain, and the roof framing details refer to a "preslab". Looks like a 2" deep fluted section of precast concrete used as a form for a 5" total slab thickness. The positive moment steel for the floor is in the Preslab, and the negative moment steel is in the CIP portion.

Anyone know where I can get any info on this? It looks like it ends up being a composite section... Just want to be sure...

Mike McCann
MMC Engineering
http://mmcengineering.tripod.com

RE: PreSlab Construction

Mike - I've seen that used in bridges a lot as substitutes for formwork for bridge slabs where forming would be difficult. I've used it on a camp tornado shelter as well. Basically the pre-slab supports the wet weight of concrete with its small "d" - then compositely serves as part of the total slab.

Do your drawings show the reinforcement? You probably only need the As values and the f'c right?

RE: PreSlab Construction

(OP)
Got both on the drawings, to include the negative steel too. Just wanted to make sure it becomes composite to develop the full section.

Mike McCann
MMC Engineering
http://mmcengineering.tripod.com

RE: PreSlab Construction

As slickdeals posted, this system is used quite a lot in Australia. What did you mean by "fluted"? It needs the truss stiffeners for transport, and the truss webs also tie the precast and cast in place together.



http://www.humes.com.au/holcimcms/uploads/HUMES/Hu...

RE: PreSlab Construction

(OP)
By "fluted" I meant an uneven surface - sinusoidal if you can imagine - probably to develop the bond between the PC and CIP portions. Similar in shape to a 1" metal form deck. No trusses involved that I see on the plans, only a total 5" thick flat slab spanning the 12.5 feet of the units.

Mike McCann
MMC Engineering
http://mmcengineering.tripod.com

RE: PreSlab Construction

I think it is also called a "filigree" slab.

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