Hubbell Limited

Alan James Lutenegger

Gary Leonard Seider

The present disclosure provides helical pile leads and extensions with closely spaced perimeter shear helical plates that develop a cylindrical failure surface between the perimeter shear helical plates and soil as the helical pile is rotated into the ground, mobilizing soil-to-soil shear strength, and thus increasing the stability, stiffness and load capacity of the helical pile.

Helical pile leads and extensions

A helical screw pile includes a longitudinal shaft having a top end and a bottom end with a plurality of helical plates arranged on the shaft in increasing diameter from the top to the bottom. The largest diameter helical plate is located toward the bottom of the shaft. A second helical plate having a diameter smaller than that of the first plate is located above the first helical plate. A smaller third helical plate is located above the second helical plate so that the smallest is located toward the top of the shaft. The helical plates can be spaced apart along the shaft or coupled together in an end-to-end manner to form a continuous helix.

Helical screw pile

A helical screw pile includes a longitudinal shaft having a top end and a bottom end with a plurality of helical plates arranged on the shaft in increasing diameter from the top to the bottom. The first helical plate is located toward the bottom of the shaft and has the largest diameter. The second helical plate is located above the first helical plate and has a diameter smaller than that of the first plate. The third helical plate is located above the second helical plate and has a diameter smaller than that of the second plate. The helical plate with the smallest diameter is located toward the top of the shaft. The distance between the first helical plate and the second helical plate is larger than the distance between the second helical plate and the third helical plate.

Growing community of inventors

Sunderland, MA, United States of America

Alan James Lutenegger