Shoot-in Soil Nailing Cost Information
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Shoot-in Soil Nailing Fact Sheet
<p><p><figure id='attachment_2628' style='max-width:625px' class='caption aligncenter'><img class="wp-image-2628 size-full" src="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/…; alt="Schematic diagram showing placement of a shoot-in soil nail in a slope." width="625" height="335" /><figcaption class='caption-text'> Shoot-In Soil Installer Mounted on a
Shoot-in Soil Nailing Specifications
<p><p><h2>Summary of Example Specifications</h2><div class="grayed-title subsection"><strong>Specification Name/Number:</strong> Owner Design Guide Specification</div><strong>Reference(s):<br></strong><em>A. B. Chance (CHANCE®)</em></p><p><strong>General Comments</strong></p><p>The <em>Owner Design Guide Specification</em> provides the contractor with a design. The contractor is then responsible for selecting appropriate equipment and construction methods to achieve the required design values.</p><p><strong> </strong><strong>Clarity</strong></p><p>The specification is easy to read without conflicting statements. The requirements of the contractor are described clearly.</p><p><strong>Risk Allocation</strong></p><p>The specification assumes the owner has provided a screw-in soil nail wall design. The contractor must furnish all labor, materials, and equipment to complete their selected method of excavation and drilling. The contractor is responsible for achieving the performance requirements.</p><p><strong>Ability To Be Fairly Bid</strong></p><p>A contractor is able to fairly bid on the work because of the completeness of the specification. However, the specification was developed assuming screw-in soil nails will be used and does not allow for substitution of other soil nail types.</p><p><strong>Constructability</strong></p><p>The specification does not require construction methods nonessential to constructing a screw-in soil nail wall.</p><p><strong>QC/QA Verification</strong></p><p>The specification includes specific pre‑construction and post‑construction testing regimen for materials and for load testing the soil nails. The testing procedure is clearly laid out with references to ASTM standards and testing equipment. The specification also includes a section on nail rejection and the actions that follow.</p><p><strong>Completeness</strong></p><p>The specification is complete. The requirements of the contractor are described clearly (submittals, testing, and some discussion of installation method).<br><div class="grayed-title subsection"><strong>Specification Name/Number:</strong> Design Build Solicitation Guide Specification</div><strong>Reference(s):<br></strong><em>A. B. Chance (CHANCE®)</em></p><p><strong>General Comments</strong></p><p>The <em>Design Build Solicitation Guide Specification</em> requires the contractor to generate a design and select equipment and construction methods to meet the specified performance requirements.</p><p><strong> </strong><strong>Clarity</strong></p><p>The specification is easy to read without conflicting statements.</p><p><strong>Risk Allocation</strong></p><p>The contractor is responsible for generating the design. In addition, the contractor must furnish all labor, materials, and equipment to complete their selected method of excavation and drilling. As a result, nearly all the responsibility lies with the contractor to achieve the performance requirements.</p><p><strong>Ability To Be Fairly Bid</strong></p><p>The completeness of the specification allows the contractor to fairly bid on the project. The specifications can be modified to allow for cost-effective, alternative wall types suggested by the contractor.</p><p><strong> </strong><strong>Constructability</strong></p><p>The specification does not require construction methods nonessential to constructing a screw-in soil nail wall.</p><p><strong>QC/QA Verification</strong></p><p>This specification does not include a specific QC/QA section, but refers the reader to “requirements set forth in the Permanent Soil Nail and Wall Excavation and Temporary Shotcrete Facing and Wall Drainage Specifications” for material and construction requirements. This specification makes no specific reference to the load testing regimen outlined in the <em>Owner‑Design</em> <em>Guide Specification</em>. The specification requires that the contractor provide the owner with submittals, which include a description of the construction method.</p><p><strong>Completeness </strong></p><p>This specification is complete in the sense that enough project information is provided for the contractor to bid the job. The document lacks certain QC/QA requirements for approval (probably due to it being a design‑build specification).</p></p>
Shotcrete Inspection/Testing
<p><p><strong>References:<br></strong><em>Byrne et al. (2003)<br>Porterfield, Cotton, and Byrne (1994)<br>Lazarte et al. (2015)<br>Rogbeck et al. (2003)</em></p><p><strong>Method Summary </strong></p><p>Soil nail walls utilizing shotcrete facing need to complete shotcrete inspection. For permanent walls, shotcrete core testing should be performed. Byrne et al. (1998) Appendix C 2.2.3 describes how to extract core samples from shotcrete walls to be tested for compressive strength.
Surveying
<p><p><strong>References:<br></strong><em>Beekman and Mallner (2005)<br>Rogbeck et al. (2003)<br>Porterfield, Cotton, and Byrne (1994)<br>Lazarte et al. (2015)<br>Byrne et al. (1998)</em></p><p><strong>Method Summary </strong></p><p>Using available surveying equipment, the site should be surveyed on a specified regular schedule in order to monitor and record any wall movements.
Tension Testing
<p><p><strong>References:<br></strong><em>Beekman and Mallner (2005)<br>Rogbeck et al. (2003)</em></p><p><strong>Method Summary</strong></p><p>This test is performed in a laboratory and determines the tensile strength of the soil nail.
Verification and Proof Testing
<p><p><strong>References:<br></strong><em>Beekman and Mallner (2005)<br>Byrne et al. (1998)<br>Lazarte et al. (2015)<br>Porterfield, Cotton, and Byrne (1994)<br>Rogbeck et al. (2003)</em></p><p><strong>Method Summary</strong></p><p>This method tests the strength of an individual soil nail by applying a specific load to a nail and measuring deflections and strain of the nail.
Visual Inspection
<p><p><strong>References:<br></strong><em>Rogbeck et al. (2003)<br>Porterfield, Cotton, and Byrne (1994)<br>Lazarte et al. (2015)<br>Byrne et al. (1998)</em></p><p><strong>Method Summary </strong></p><p>Visual inspection, similar to surveying, can be used to record any wall movements during and after construction of a soil nail wall in addition to any other visible problems which may exist (such as cracking, settlement of adjacent structures, cracks in the shotcrete, heaving, and seepage).