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 weld. 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:
- Time saving, fast installation.
- Clean installation.
- Increased section modulus.
- Groutable for higher capacity.
- Variety of extension lengths available.
- Helix diameters from 8 inch to 14 inch.