What is a pile cap used for?
Pile caps create a stable foundation and offer a larger area for the distribution of the building load onto the piles. They act in a similar way to piled raft foundations, where a concrete slab rests on soil which may be susceptible to movement, above a group of piles.
How do you size a pile cap?
Wrap a length of string around the top of your pile (where a piling cap would go), and mark the length of the string (or cut it). Measure the string and then divide that number (the circumference) by 3.14159 (pi) to get the diameter of your pile.
Is pile cap necessary?
Pile cap Necessity. Pile is necessary when the bearing capacity of soil below the structure is insufficient for a spread footing. It transfers the load to deeper, firmer strata. Piles used where the soil particularly affects by seasonal changes, to transfer the load below the level of such influence.
Do pile caps need to be below frost line?
The bottom surface of any footing, pier, pile cap, or other foundation construction, other than grade beams, shall be carried down at least four feet below the lowest level of the adjoining ground or pavement surface that is exposed to frost, except as follows: (1) In refrigerator, cold storage, or similar areas, the …
How do you make a pile cap?
Worked Example: Design of Pile Cap consider 150mm offset from the pile and space between piles as 2.5 times pile diameter. Effective depth, d = 1000-50-20/2 = 940 mm > 750mm; (2.5×600/2) Ok. The critical section of the pile shall be considered as 20% of the diameter of the pile inside of the face of the pile.
How thick should a pile cap be?
Generally, its thickness should not be less than 500mm which may be reduced to 300mm at the free edges. 6. The piles should atleast 50mm into the pile cap.
Is pile cap required for single pile?
No. An independent pile cap requires 3 piles.
How deep do wood pilings need to be?
Satisfy criteria for embedment depth, or how deep the piles must go. Engineers usually require at least 20 to 25 feet of embedment to get the bearing and security you need.
How long do timber piles last?
Timber piles have successfully supported structures for more than 6,000 years. Over the years, the methods that man has employed to extend the life of timber piling have evolved to the point that timber piles will last for over 100 years.
How deep is the frost line in NYC?
Whereas the average depth of frost for our region is between 15 and 20 inches, the established depth frost line varies from 36 to 48 inches.
How do you make a pile cap for a single pile?
IMHO, for a single pile pilecap, the size is fixed based on pile size and column size (6″ on all sides from pile and 2″ on all sides from column – whichever is more critical). The depth of the pilecap is determined by required anchorage length for column bars and pile bars.