The pile cap (fixed or adjustable) must directly bear on the shaft below. The 4 set screws shall be torqued with a minimum of 15 ft-lb of torque using a hexagonal key. For adjustable cap, a fifth set screw shall be torqued to prevent lateral movement of the threaded rod.
The sleeve of the pile cap (fixed or adjustable) is attached to the shaft of the pile using self-drilling screws (a minimum of two (2) or three (3) screws is required, see below). Techno Metal Post recommends using the following product or equivalent:
The allowable uplift resistance values (lb) between the pile cap and the pile attained during the laboratory test.
UCAN Self-drilling Screws Allowable uplift resistance (lb) between the pile cap and the pile |
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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 decks and additions, we recommend using a minimum of 2 self-drilling screws. For piles supporting a structure with a roof with no floor (carport, pergola, etc.), we recommend using 3 self-drilling screws minimum. The connection of the supported member may limit uplift capacity.
The use of adjustable pile cap must be avoided for free-standing structures and structures with a roof (carport, pergola, etc.) given the presence of greater lateral and uplift loads.
SCREW PILES
Techno Metal Post makes life easier for anyone with a construction project that requires a foundation in almost any type of soil.