Patent ID: 9670638
Date: 2017-06-06
CPC Classifications: E02D

Claim:
1. A cased helical pile installed in soil, comprising: a segmented shaft having a screw near a lower end thereof; a radially outwardly projecting soil displacing member on the shaft near the screw; a segmented casing including a plurality of serially arranged, cylindrical sleeves surrounding the shaft, the lowest one of the sleeves disposed adjacent the soil displacing member; and at least one cylindrical sleeve coupling, each sleeve coupling surrounding the shaft and joining a pair of adjacent sleeves, each sleeve coupling including two axially opposed, annular coupling seats, each of the coupling seats abutting an end of one of the pair of adjacent sleeves, and wherein each sleeve coupling includes a center wall dividing the sleeve coupling into two oppositely facing recesses, each recess bounded by an annular outer side wall and forming the coupling seats, and wherein each of the annular coupling seats includes a self-lubricating washer abutting the center wall and a metallic washer abutting the self-lubricating washer and abutting an end of one of the sleeves.