How is helical pile capacity calculated?
This theory suggests that the capacity of a helical anchor/pile is equal to the sum of the capacities of the individual helix plates. The helix capacity is determined by calculating the unit bearing capacity of the soil at each helix and then multiplying the result by the individual helix’s projected area.
What size helical pile do I need?
The industry standard is typically 3 x diameter as measured from center to center. We typically use the largest helical plate, so for a lead section with an 8”/10”/12” helix configuration, the minimum spacing should be 3 x 12” = 36” center to center.
How do you calculate screw piles?
The ultimate screw pile capacity calculated as per the cylindrical shear model will be the sum of the bearing capacity below the bottom helix in compression, or above the top helix in tension, plus the skin friction acting along the cylinder of soil circumscribed between the top and bottom helices.
How many helical piers do I need?
Assuming each pier has a bearing area of 1.6 sq ft (two helices of 12” diameter each), there must be a minimum of 405,000 lbs/12,000 psf divided by 1.6 ft2/pier, or 21 piers around the perimeter. For a safety factor of 2, there should be 42 piers.
How much weight can a screw pile hold?
How much weight can a Helical pile support? Depending on the job our Hercules Pile can hold more than 500 tons or 1,000,000 pounds.
What are helical piles used for?
Helical piles are hollow steel tubes that are used to stabilize structures by anchoring the load to the surrounding ground, much like a driven pile. However, helical piles are screwed deeply into the earth, section by section if necessary.
How much weight can a helical pile hold?
500 tons
Helical piles are capable of holding more than 500 tons of weight.
How strong are helical piles?
A helical pile is a deep foundation solution suitable for supporting light and heavy structures. They are engineered to support compressive loads less than 1kN (225 lb) or in excess of 5,000kN (1.125 million lb) – from a small landing to a 32 story tower, helical piles are an option.
What are helical screw piles?
Helical piles, also known as helical piers or screw piles, are constructed using steel shafts with helical flights of various sizes to suit the site specific ground conditions.
How much weight can a helical pier hold?
Maximum Capacity A single helical pier may hold up to 500 tons of weight, but when together in a foundation atop a system of helical piers, the number may be even higher.
How much are helical piles?
When getting pricing from us you will notice that Helicals can cost around $30 dollars per foot. Meaning a Helical around 20-ft can be estimated around $600 dollars.
How much weight can screw piles support?
Helical piles are capable of holding more than 500 tons of weight.
How is the capacity of a helical pile determined?
The capacity of a helical anchor/pile is dependent on the strength of the soil, the projected area of the helix plate(s), and the depth of the helix plate(s) below grade. The soil strength can be evaluated by use of various techniques and theories (Clemence, 1985).
How big is a helical pile with bearing plates?
Typically, a pile with bearing plates has 1.2 to 1.5 times the capacity of a pile with just a shaft (Prasad and Rao 1996). Helical pile capacity in clays is optimized when the bearing plates are spaced 1.0 to 1.5 plate diameters apart along the shaft (Prasad and Rao 1996).
What do you need to install a helical pile?
To install the helical pile, a torque motor that can meet the required design torque is all that is really needed. As a result, the installation setup can be incredibly versatile, as the torque motor can be operated by hand or mounted onto machinery. The piles are rotated into the ground until the desired torque or depth is met (Perko 2009).
How are helical piles different from other deep foundations?
As hinted in its name, helical piles differ from other deep foundations and are most notable for having spiraling blades along their shafts, as opposed to having a relatively uniform shape like driven piles and micropiles. Some other names for helical piles include helical piers, helical anchors, screw piles, and screw foundations.