DIFFERENT FOUNDATION TYPES WILL USE DIFFERENT ANCHORS
Dec 17, 2021| A. Drilled Cast-in-Place Concrete Piers:
12” diameter piers
6’-0” deep piers for the (2) Back Legs; 5’-0” deep piers for the (2) Front Legs
Rebar cages required (amount dependent on seismic design category of site)
B. Driven Steel Piles:
W6x7 pile assumed (4” wide by 6” deep with a steel weight of 7 lbs. per foot)
7’-3” deep piles for the (2) Back Legs; 6’-0” deep piles for the (2) Front Legs
C. Ballast Blocks (or Grade Beams):
800 lbs. of concrete required for Each Back Leg
500 lbs. of concrete required for Each Front Leg
Concrete block shall have enough surface area to resist the lateral load through friction or be embedded into the ground to resist.
Due to the amount of weight and surface area required at each leg and the space available, it is typical to link the front and back legs together with a single ballast block. Each block would need to be 8 ft. long x 1 ft. wide x 1.5 ft. deep.
D. Helical Pile or Ground Screw:
Each helical pile or grounds screw is installed in the range of 5 to 6 ft. (typical).
Load tests required using a minimum factor of safety of 1.5 and typically higher when only a select number of anchors are tested (per anchor manufacturer).
Provide a summary of the tested loads to the Engineer of Record for review, approval, and submittal to the governing jurisdiction.
E. Earth Anchor:
Each anchor driven to around 2 ft. deep (average for most Osprey installations)
Load test Back Leg anchors to 1400 lbs. and Front Leg anchors to 500 lbs. (factor of safety of 1.5).
Provide a summary of the tested loads to the Engineer of Record for review, approval, and submittal to the governing jurisdiction.