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Each
extension has provisions
for a coupler at one end and a
connection at the other. The
coupler is an integrally forged
socket that slips over an RCS
hub of the same size. Each
socket has a transverse hole so
that lead sections and
extension sections can be connected
with a bolt and nut.
Coupling bolts are 5/8
inch (15.9 mm), 3/4
inch (19.1 mm) or 7/8
inch (22 mm) in diameter and
comply with ASTM A325
Type 1, and have a Class C
hot-dipped zinc coating that
complies with ASTM A153.
The corresponding nuts
conform to either ASTM
A194 Grade 2H or ASTM
A563 Grade DH. Nuts have a
Class C hot-dipped zinc
coating that complies with
ASTM A153.
For all helix steel pier leads
and some extension shafts, helical plates are welded to
their respective hubs.
Nominal spacing between
helical plates is not less than
2.36 times the diameter of
the lower helix.
Helical Technology is proud
to offer its clients a variety of
high quality materials. In
addition to the traditional
square shaft pier, we also offer
a structural pipe shaft pier.
Benefits of the round shaft
