The pile cap, otherwise known as the plate (fixed or adjustable) sits directly on the shaft below it. The 4 set screws will be bolted and tightened, with a minimum of 15 ft-lb of torque using a hexagonal key. For the adjustable cap, a fifth screw needs to be installed, to prevent lateral movement of the threaded rod.
A sleeve is attached to the shaft of the pile using self-drilling screws (a minimum of two or three screws is required, see below). Techno Metal Post recommends using the following product or equivalent:
The allowable uplift resistance varied (lb) between the pile cap and the pile during the laboratory test.
|UCAN Self-drilling Screws
Allowable uplift resistance (lb) between the pile cap and the pile
|Screw size||Point||Resistance for 2 screws||Resistance for 3 screws||Resistance for 4 screws|
|12-24||#5||2 000 lb||3 000 lb||4 000 lb|
Please note that for deck piles and building additions, we recommend using a minimum of 2 self-drilling screws. For piles supporting a structure with a roof and no floor (carport, pergola, etc.), we recommend using a minimum of 3 self-drilling screws. The connection of the supported infrastructure may limit the uplifting force.
The use of an adjustable pile cap must be avoided for free-standing structures with a roof (carport, pergola, etc) given the presence, of greater lateral and uplift loads.
Techno Metal Post makes life easier for anyone with a construction project that requires a foundation in almost any type of soil.