STAGGERED FERRULES PLACEMENT ON PRECAST PANEL

The design drawings for one of our Precast Project we were working on suggests ferrules must be placed staggered as noted below.

The Problem:

However, these casting components, such as ferrules cannot be placed on both sides of a precast panel with a thickness of less than 250mm. This mainly causes ferrules to clash along its length. This approach will not work. Can you see why

The Solution:

One of the projects, for our client involves utilizing the staggered arrangement approach. Look at the (fg.1)

(fg.1)

The both sides of wall are provided with support angles SA1 to hold the slab/ Beam.

Both sides are utilizing M16 ferrules, within the panel. The issue lies in the fact that the ferrule Height measures 96mm whereas the wall thickness is 150mm.

Client using PSA Standard ferrules

Example:

                   Wall thick – 150mm                                     

                   M16 Ferrule length – 96mm add both sides of wall  

                   96 + 96 = 192mm (greater than the wall thickness 150mm)

                   The length of the PSA P1696ZF is 96mm, as per the PSA schedule.

Ferrules cannot be placed inline; the only option is to staggered them.

Look at the (fg.2)

(fg.2)

The above ferrule placement factors and consideration is not required if the panel thickness is 250mm and above.