Tilt-up and Precast Panel Lifting Anchor Design 1

[RFreund]

Is there a good reference for the design of lifting anchors for Tilt-up or precast construction?
I'm looking for 2 parts really. The first part is any information regarding the layout of the anchors. Meaning minimum number and "ideal locations". The second part is in regards to the actual design of the anchors (loads and capacities).
I've seen the book "Tilt-up Engineering" referenced elsewhere on this site, but I'm not sure if it covers these topics.

Thanks!

 

[DoubleStud]

Well, it is all depends on how it is cast, how it is transported, how it is being lifted. Most lifting anchors companies will have design capacity. What you need to watch out for are lifters that are cast on the edge of the panels (top face of wall). Those have really low shear value when lifted on its side and you need extra reinforcement. Also it is all depends on whether or not you want to use a special clutch to lift it or not. If you do use it, you better make sure the rigging company at the jobsite has the clutches ready when the truck arrives. Also with precast usually it is being stripped at lower strength (1500-2000 psi), so make sure you use the lower strength capacity if you are using the lifters to strip.

 

[ryaneng]

We do some panel lifting design and use a program called Panels Plus to complete the design. This goes through a degree by degree lift and determines the lifting loads on the anchors at each point. If you're looking for some general information on the design, Dayton Superior has a tilt-up handbook that gives some good information.

It's also good to check your local OHS standards, where I am there are different requirements for factor of safety depending on if there is a standard lift or a blind lift etc.

 

[JohnRwals]

The best reference is:
PCI Design Handbook, 8th Edition - (MNL-120-17).

 

[Brad805]

Tilt up and Precast have some differences. Precasters handle more times, and their operation will dictate a lot of the lifter needs. Tilt-up lifters will depend a lot on the crane you have on site and the size of your pieces. Unless you are the detailer I am not sure how deep you want to go into this.

Most pick the lifter capacity out of a chart by Dayton Superior, Meadow Burke or one of the other suppliers.

Tilt-up: Tiltup Resources

 

[Prestressed Guy]

Another major difference between tilt-up and plant precast is how it needs to be lifted. Tilt-up is usually rigged so that it is heavy on the bottom edge and it rotates to vertical by pivoting on that edge. Precast needs to be lifted straight up off the bed so the load needs to be balanced top to bottom.