tilt-up precast concrete

[Lutfi]

I have few questions regarding Tilt-ups sine I only do them every few years:

1. I am used to leaving a slab trip edge at the perimeter wit ha slope of 2:1 to keep soil stabilize soil. Is this technique still in use?

2. I will ask specialty engineer to design the panels, their connections, lifting for wind load, gravity load and shear (the panels will act as shear walls). Is this still common practice?

3. I have used a master section in the past. Are there any good sites for an up to date section 03470?

Your input would be appreciated.

 

[haynewp]

Yes, there is usually a pour strip that is at the edge of the slab that connects the panel to the strip and the strip is doweled back to the main slab. The vapor barrier under the pour strip & slab can reduce the slab-soil friction to resist the lateral coming from the panels. So you may want to include an additional connection from the panel to the footing, depending on the amount of lateral loads.


I usually design the panels for everything except for the lifting inserts. They are usually done by the insert provider Burke etc.

 

[ANTIETAM]

Hello Lutfi
This would be a good question for

http://www.tilt-up.org/forum/

1. As haynewp mentioned the pour strip is common. Dowel rods into the footing & shim placement with angles bolted to the footing against the bottom of the wall. Embeded angles into the edge of the slab and field welded to embed plates in the wall are common although may other methods are used, inverted angles and patented inserts.
2. Many more firms are providing the total design package because tilt-up is becoming more prevolent and with programs such as Enercalc avaliable. One the other hand, some firms leave the connection up to the contractor to supply the design for approval. I recommend seeking out local tilt-up contractors for their input and then provide a design based on these standards.
3. Try this site:

http://www.shelbycountyalabama.com/pdf/section03470.pdf

 

[JedClampett]

I was introduced to factory fabricated tilt-up during a project due to a suggestion by the contractor. In my case, since I had already provided a design, the supplier had their own engineer redesign everything. If there is a supplier in your area, it's pretty slick. You don't have to depend on field labor or have space to cast the panels. Its drawbacks are the panels are limited in size to what can be shipped (I think 12 ft. is the widest) and of course the shipping cost. The one manufacturer I'm aware of is Speed Fabcrete (

http://www.speedfab-crete.com/pcindex.html)

in Fort Worth, TX, but I wouldn't be surprised if there are others.

 

[Lutfi]

Jed,

It is a good concept. However, Texas would add lots of cost. This project has lots of panels that will be around 45 foot high.

I appreciate the input from the gang.

 

[jheidt2543]

There are lots of precasters around the USA that do precast tilt-up panels. Look for Fabcon, Flexicore or Spancrete franchises in your area. The cost of trucking limits the area covered by any one plant.