TAPERED PILES AND METHODS OF USING TAPERED PILES

• US 3,820,347 A
• Filed: 11/01/1971
• Issued: 06/28/1974
• Est. Priority Date: 11/01/1971
• Status: Expired due to Term

• Current Assignee: Medema W
• Original Assignee: Medema W
• Inventors: MEDEMA W
• Application Number:
  US05/194,109
• Time in Patent Office: 970 Days
• US Class Current: 405/232
• CPC Class Codes: E02D 27/14 Pile framings , i.e. piles assembled to form the substructure
• CPC Class Codes: E02D 5/30 made of concrete or reinforced concrete or made of steel and concrete E02D5/50 takes precedence; assembled from segments E02D5/523; prestressed concrete E02D5/58

Abstract

A molded concrete tapered piling which is reinforced or prestressed and has a preferred amount of taper per unit length of piling, and method of using said piling by driving it into earth stratas including stratas wherein it has been found that straight-sided pilings of comparable length do not provide sufficient load-bearing capacity, lateral support and uplift anchorage for a structure to be built thereon.

Claims

1. A reinforced solid concreTe pile everywhere having a square cross-section, comprising:

a straight sided butt section having a cross-section of at least 14 inches square, and a tapered-sided tip section the widest portion of which has the same crosssectional dimensions as said butt section, and wherein each of the four tapered sides of said butt section converges, from a shoulder joining said butt section toward the longitudinal axis of the pile an amount in the range of about one-eighth to about three-eighths inch per linear foot of axis, said tapered tip section being not less than about 9 1/3 feet long, and terminating in a tip end comprising a square area not less than about 7 inches square.

2. The pile of claim 1 where each of the tapered sides converges toward the axis at about one-fourth inch per linear foot of axis.

3. The pile of claim 2, wherein the tapered tip section is about 15 feet long.

4. A method of increasing the load bearing capacity and uplift anchorage capacity of piles of constant butt cross-sectional area driven in the same construction site, comprising providing tapered pilings of reinforced, solid concrete, everywhere having a square cross-section, said tapered pile comprising a straight-sided butt section having said constant cross-sectional area of at least 14 inches square, and a tapered-sided tip section the widest portion of which has the same cross-sectional dimensions as said butt section, and wherein each of the four tapered sides of said tip section converges from a shoulder joining said tip section to said butt section, toward the longitudinal axis of the pile an amount in the range of about one-eighth to about three-eighths inch per linear foot of pile axis, said tapered tip section being not less than about 9 1/3 feet long, and terminating in a tip end comprising a square area not less than about 7 inches square, and driving said tapered pilings thereby simultaneously densifying the composition of said strata and achieving a driven point of refusal commensurate with a desired criteria load bearing capacity and uplift capacity.

5. The method of claim 4, wherein the step of providing said tapered pilings comprises providing a tapered pile wherein the tapered tip section is about 15 feet long.

6. The method of claim 4, additionally comprising building a designed structure on said tapered pilings driven at said site, thereby providing at least said desired criteria load bearing capacity and uplift anchorage capacity for said structure.

7. A method of increasing the load bearing capacity and uplift anchorage capacity of straight-sided piles driven in a construction site, comprising, driving straight sided pilings and tapered pilings in close proximity to each other in said construction site, each of said tapered pilings comprising:

a reinforced solid concrete pile everywhere having a square cross-section, comprising;

a straight sided butt section having a cross-section of at least 14 inches square, and a tapered-sided tip section the widest portion of which has the same cross-section dimensions as said butt section, and wherein each of the four tapered sides of said butt section converges, from a shoulder joining said butt section, toward the longitudinal axis of the pile an amount in the range of about one-eighth to about three-eighths inch per linear foot of axis, said tapered tip section being not less than about 9 1/3 feet long, and terminating in a tip end comprising a square area not less than about 7 inches square.

8. The method of claim 7, wherein said straight sided piles and tapered pilings are located not more than about 6 feet apart.

9. A reinforced solid concrete pile everywhere having a square cross-section comprising, a straight sided butt section having a cross-section about 14 inches square, and a tapered-sided tip section the widest portion of which has the same cross-sectional dimensions as said butt secTion, and wherein each of the four tapered sides of said tip section converges, from a shoulder joining said butt section, toward the longitudinal axis of the pile an amount of about one-fourth inch per linear foot of axis, said tapered tip section being about 15 feet long, and terminating in a tip end about 7 inches square.