US 11,851,840 B1
Coupling for driven steel pipe piles and method of manufacturing same
Victor Arthur Sinclair, Houston, TX (US)
Assigned to John Lawrie, Inc., Houston, TX (US)
Filed by JOHN LAWRIE, INC., Houston, TX (US)
Filed on Jan. 23, 2023, as Appl. No. 18/100,355.
Claims priority of application No. CA 3184038 (CA), filed on Dec. 15, 2022.
Int. Cl. F16L 13/16 (2006.01); F16L 13/14 (2006.01); B21D 39/04 (2006.01); E02D 5/28 (2006.01); E02D 5/48 (2006.01)
CPC E02D 5/285 (2013.01) [E02D 5/48 (2013.01); E02D 2200/1685 (2013.01); E02D 2250/0015 (2013.01); E02D 2300/0029 (2013.01); E02D 2600/20 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A coupling between a lead pile segment and an extension pile segment of a driven piling, the coupling comprising:
the lead pile segment;
the extension pile segment having a formed end, an opposite driven end opposite of the formed end, and a body extending therebetween, the formed end having an inner diameter that is equal to or greater than an outer diameter of an exposed end of the lead pile segment and is greater than an outer diameter of the body of the extension pile segment;
an external ring having an inner diameter sized to snugly fit over the outer diameter of the body of the extension pile segment, the external ring affixed to an exterior surface of the body of the extension pile segment and positioned upstream of the formed end;
the coupling formed by inserting the exposed end of the lead pile segment into the formed end of the extension pile segment and applying a driving force to the driven end of the extension pile segment such that the formed end of the extension pile segment undergoes secondary end forming thereby increasing an initial length of the formed end prior to coupling the extension pile segment with the lead pile segment to a final length of the formed end after the driving force is applied to the driven end to couple the extension pile segment to the lead pile segment; and
wherein the exposed end of the lead pile segment is cold extruded into and through a portion of the extension pile segment adjacent to the external ring to further increase a force resistance of the coupling.