The Characteristics of
Ultra High Strength Pile
Improvement of allowable axial load of 145%~147% compare to conventional Pile
Increased skin friction force as a result of a measure to increase side bearing capacity, extended bearing capacity(Ext Pile, S-phc Pile, etc.)
Pile construction technology improvement.
Reduction of number of Piles due to increase of bearing capacity
Development of construction method that increase bearing capacity by connection Pile to soft rock (N-value over 60)
→ Occurs when bearing capacity increase caused by extended head and depth of penetration surpasses Pile strength.
Contribution to reduction of construction cost by performance improvement
The increase requirement for Pile axial load must have the increase in concrete
Concrete compressive strength or the increase in sectional area. If concrete compressive strength increase from 80Mpa to 130Mpa,
allowable axial load increase by 62%.
No early appearance of rock mass or no weathered rock
In case of the depth to weathered rock is deep
In case of large thickness of weathered rock