MacLean Dixie HFS

Tieback / Bulkhead - Commercial > Tieback

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General Information





 RCS Lead Shaft  RCS Extension  Tieback Adapter

MacLeanCivil offers a broad range of steel helical screw anchors for tieback applications. We offer many time proven solutions with experience in anchoring since the 1920's.  It is important that the product and installation meets stringent requirements to ensure the quality and workmanship of the manufactured product and that installation is performed by qualified and certified technicians to ensure the foundation will perform as expected.

MacLeanCivil has qualified relevant products to meet the IBC (International Building Codes) ICC AC358 Acceptance Criteria for Helical Foundation Systems and Devices.  This should be  important criteria when selecting the supplier to protect your investment for years to come.

A typical helical screw anchor for a tieback application consists of a 1) lead, 2) one or more extensions and 3) a tieback adapter.

The lead is  a solid round corner square shaft with one or more helices or circular plates welded to the shaft.  The helices provide the bearing area to support the tieback.  The shaft type and size and length are determined by the soil, installation depth and load requirement.  The lead is installed with a variety of hydraulic torque motor equipment.  The lead (similar to installing a wood screw into wood) is rotated into the soil typically at a 15 degree to 20 degree angle below horizontal and to a suitable depth until competent soil is reached to develop the required tension load capacity.

The location, number and type of helical screw anchors are selected by the engineer or certified MacLeanCivil Distributor or installer.  Torque monitoring by a certified MacLeanCivil installer assures each helical pile is installed to the required specification.

Extensions are used to advance the lead to whatever depth is required.  The total installed depth may range from near the tieback wall to any distance as necessary. 

A special tieback adapter is attached with a bolt to the RCS extension shaft.  A bearing plate is placed over the tieback wall.  A Williams's thread bar is field cut to make up the necessary connecting distance from the anchor to the bearing plate.  Tension load to the anchor can be applied immediately.  Alternate terminations are also available.

This tieback system is used for supporting excavated walls, excavations for building foundations, seawalls and other similar applications.   

      Features and Benefits of MacLeanCivil Helical Foundation Systems:
  • Installed with no vibration
  • Available for immediate use -- no concrete or grout to cure
  • No spoils
  • Forged square socket coupling system -- no bolts in shear during installation-- no elongated or torn bolt holes and no bent bolts during installation.
  • Integral socket hot forged with induction heat -- no welds
  • Improved productivity; bolt holes align for faster assembly -- just insert next extension and add bolt.  No alignment issues when in tight quarters
  • Greater torque capacity for size -- best performance value.
  • Helical piles / anchors may be removed
  • Contributes to "Green" environment.
  • Available standard hot dip galvanized ASTM  A-153 or black (not coated)
ICC AC358 Acceptance Criteria For Helical Foundation Systems and Devices Tests:
  • Full scale compression Load Test in sand and clay
  • Full scale Tension Load Test in sand and clay
  • Full scale Lateral Load Test
  • Shaft Torsion
  • Helix Torsion
  • Coupling Rigidity
  • Helix Capacity
  • Bracket Capacity
Additional Information:
  • Within each product group you can view PIB's (Product Information Bulletins) for more product information.
  • Drawings can be viewed by clicking on a catalog number (underlined and displayed in red) in the product tables
  • Brochures, specifications and additional technical information is available in Technical Reference section.
  • Go to Distributor Location to contact the MacLeanCivil certified distributor in your area.

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