What is the use of pile driving formula?
What is the use of pile driving formula?
Pile driving formulas, which directly relate the pile set resulting from a hammer blow to the static load capacity of the pile, are often used to decide whether a pile will have the required design capacity.
What is dynamic pile formula?
Dynamic pile formulas are widely used to determine the static capacity of the driven pile. The Energy used equals the driving resistance (Pu) x the pile movement (s). Energy lost is due to friction, heat, hammer rebound, vibration and elastic compression of the pile, the pacing assembly, and the soil.
What is minimum depth of foundation?
minimum depth of foundation:– minimum depth of foundation is around 5 feet for a small residential building from ground level or at least 1.50 times the width of footing. In cold climates the depth of footing is Kept at a minimum of 1.50m below surface because of possible frost action.
How is pile reinforcement calculated?
Total Cutting Length for Vertical Reinforcement = Anchorage Length at the bottom of the pile + the height of the pile + development length (40d) + Lap length (50d) – clear cover provided at the bottom.
How do you calculate pile excavation?
The quantity of piles is calculated by dividing the length by 8 feet. The depth of the excavation multiplied by 2.5.
How is pile settlement calculated?
Settlement of piles
- The settlement of pile caused by the load at pile point [Se(2)]
- The allowable working load on a prestressed concrete pile 21 m long that has been driven into sand is 502 kN. The pile is octagonal in shape with D=0.356 m and Ap= 0.1045 m2, and perimeter (p)= 1.168m.
How do you calculate shear force in pile?
The input shear Force is the “shear force capacity of the reinforcement”. It is based on your applied shear force from the pile, where “Input shear force” = applied shear force from the pile) * (Pile spacing) * (Safety Factor).
What is dynamic pile capacity?
Dynamic load testing (or dynamic loading) is a method to assess a pile’s bearing capacity by applying a dynamic load to the pile head (a falling mass) while recording acceleration and strain on the pile head. It may be performed on all piles, regardless of their installation method.
How is pile load test calculated?
Selection of piles for the Routine Test is done based on number of piles required subject to maximum of ½% of total number of piles required. The number of tests may be increased to 2% depending on the nature / type of structure. The test load applied is 1½ times the safe carrying capacity of the pile.
What is the formula for allowable load of driven pile?
Engineering News Formula. As per the Engineering News formula the allowable load of driven pile is given by: Where, Q a = Allowable load in kg. W = Weight of hammer. h = Height of fall in cms. s = Final settlement per blow known as set. c = Empirical constant (c = 2.5 cm for drop hammer and 0.25 cm for single acting and double acting hammer)
How long does it take to drive a pile?
Its use as a pile driving mechanism allowed piles to be driven at a rate of one in four and a half minutes. At the time, human-powered pile driving could only install one pile in more than twelve hours. Steam hammers came into use in the United states after 1875. In 1887, Vulcan Iron Works developed the first “#1” hammer.
What are dridriving piles and how do they work?
Driving piles allows a structure to be placed in an area that would otherwise be unsuitable given the subsurface conditions. This makes it an incredibly useful technique to this day. While the method of driving piles has evolved considerably, the same basic technique is still used to achieve the goal of installing a pile into the ground.
How does the penetration of the pile depend on load resistance?
The penetration of the pile during driving under each blow of the hammer depends on the load resistance capacity of the soil into which the pile is driven. The greater is the penetration of the pile per blow, the lesser will be the load resistance capacity of the soil.
