Soil Nailing

Faster, Better Soil Nailing with the SOIL SCREW® Retention Wall System

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 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

Gravity Wall Designs

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 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.

Reinforced Shotcrete Veneer
Soil Screws in Retaining Wall

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.

Profit from the design flexibility of this fundamental difference. Join other innovative designers who already have. Contact your Chance representative to get your SOIL SCREW Design Manual today.


SOIL SCREW® anchors have 1-1/2”-square shafts with 8”-diameter helices and are hot-dip galvanized per ASTM A 153 after fabrication.

55 kip Torque Rating and *70 kip Ultimate Tension Rating for Extensions and Lead Sections.


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

Two-Helix Lead Section

Three Helix Lead Section

Three-Helix Lead Section

Retention Wall System

Terminations fit threadbar or provide a threaded stud to work with prefabricated or site-made lock-off devices. Other termination fittings also are available.

In some cases, the through-hole at the shaft end maybe simply crosspinned.

Retention Wall SystemOne Inch Threadbar Adapter

Termination Adapters

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

Anchoring the World

Since 1912, Chance has been the international leader in earth anchoring. Our helical piers and anchors are used worldwide to secure soil retention projects and deep foundation applications such as residential and commercial buildings, tower foundations and heavy equipment foundations.

Engineered for dependability and long-term stability, CHANCE® helical piers and anchors feature exclusive anchoring techniques, tools, designs and sizes that make other foundation methods a thing of the past.

Approved by all national building code agencies, CHANCE® helical piers and anchors are your first line of defense against poor soil conditions, landslides, floods and time.

Demand A Better Foundation

With nearly 400 dealers and distributors nationwide and in Canada, we are ready to provide you everything you need to get the job done right. We offer engineering guidance, field supervision, accessibility, warehouses, material traceability, AWCcertified welders, technical support and complete documentation.

Ask a distributor near you for our comprehensive design manual (hardcopy or CD) or download a complete Sample Specification Guide online. Demand a better foundation today. Locate your nearest distributor at our web sites below.

Down. Right. Solid.

Our tagline is our promise. Our foundation and anchoring products go down with power into the ground and are accurate, level and right the first time. The result is solid stability.

Click here to download the complete SOIL SCREW® Retention Wall System PDF.