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Commercial & Industrial Solutions

Soil Nailing

Soil Nailing

Faster, Better Soil Nailing with the CHANCE® Soil Screw® Retention Wall System

The CHANCE® Soil Screw retention wall system reinforces the earth to construct gravity walls. In this “soil nail” application, a CHANCE screw anchor acts in a bearing mode compared to grouted anchor, which relies on friction. This gives the Soil Screw retention wall system economic advantages. Bearing plates are spaced along the entire length of Soil Screw anchors. They are ready for immediate loading as soon as installed.

Backhoes and skid-steer loaders can quickly rotate Soil Screw anchors into place. Anchor size and grid spacing are designed to local soil conditions and load requirements. A reinforced-shotcrete veneer often is applied to the wall face.

Construct gravity walls faster with the CHANCE Soil Screw retention wall system. Its speed and bearing mode can beat the delays and costs of grouted soil nails.


  • Predictable capacity
  • Cost-effective method
  • Easy to store, reusable
  • Pre-engineered system
  • Labor-saving, keeps crew small
  • Screws into place (not predrilled)
  • Less equipment than grouted nails
  • Site-specific to conditions and loads
  • Extendable with bolted joint connection
  • Compatible with other materials and practices
  • Bearing device in place (not friction dependent)


  • No grout
  • Fast installation
  • Clean installation
  • Immediate loading
  • No spoils to remove
  • Lower installed costs
  • One-trip convenience
  • Installs in limited access areas
  • Reclaims valuable building locations
  • No heavy installing equipment required

Build Better Gravity Walls by Design

Load-bearing Superiority of Screw Anchors

Bearing plates are spaced along the entire length of screw anchors. These true spiral helices install with ease and minimal soil disturbance. Monitoring torque during installation accurately indicates expected holding capacity for predictable results. Capacity is proportional to installation torque.

The CHANCE Soil Screw retention wall system reinforces in situ soil with screw anchors near horizontal. Anchor sizes and grid spacing are determined by soil conditions and load requirements, including intended overburden.

The system removes performance uncertainties and associated costs of grouted soil nails in soils of low shear strength. Screw anchors in soil act as bearing devices as opposed to grouted anchors which rely on friction between the soil and grout.

Contact your Hubbell Power Systems, Inc. representative to get your CHANCE Soil Screw design manual today.


  • CHANCE Soil Screw anchors have 1-1/2”-square shafts with 8”-diameter helices and are hot-dip galvanized per ASTM A 153 after fabrication.
  • 57 kip Torque Rating and *70 kip ultimate tension rating for extensions and lead sections.
  • Extensions
  • Forged integral coupling sockets bolt-up quickly, efficiently transfer installing torque. Length, from through-hole to coupling bolt centers:
  • 57-1/2” or 80-1/2”.
  • *Furnished coupling bolts limit ultimate tension rating.
  • Two helix extension
  • Two-helix extension
  • Three helix extension
  • Three-helix extension
  • Lead sections
  • Select from double- and triple-helix leading and extension sections for job-specific combinations. Length, from through-hole center to leading edge of first helix: 53” or 70”.

Two helix lead section
Three helix lead section

Retention Wall System
Anchor terminations fit a threadbar or provide a threaded stud to work with pre- or site-fabricated structural wall connection. Other termination fittings also are available.
In some cases, the through-hole at the shaft end maybe simply cross-pinned.

Termination Adapters
Both fit 1-1/2” square-shaft anchors.
Both are hot-dip galvanized per ASTM A 153 after fabrication.