One of the benefits of screw piling is the speed with which it is delivered on site.
The final process on site within the piling sub-contract usually involves the connection detail. This is typically achieved by placing reinforcing bars into the concrete infill within the steel tube of the screw pile.
|A typical Screw Pile Connection|
However, there are many ways to form a connection, dependent on load requirements.
A few of the more common examples are:
- Reid bars with flange plate nuts
- Annuli - welded to the pile
- Cage style arrangement where pile allows
- Shear studs or dowels
Where possible, we will propose the use of straight bars - this makes it easier for following trades to place cages, saving further valuable time on site.
Typically the screw pile designer will propose a connection detail. However as the connection detail can affect what happens above it, the structural engineer's involvement is required to ensure design requirements are met. A collaborative approach to this element ensures Good Connections - a technically suitable and economical result.
Factors to consider when developing connection:
- Design loads
- Bar development length
- Bond between concrete and pile wall (typically this is greater than bar development)
- Minimum steel to concrete ratio
- Constructability for following trades
For more information about design and connection of screw piles, contact one of our team or visit: