<p><p><h2>Commentary</h2>The costs of micropiles on a highway project are typically captured in a contract bid item which is measured by the lineal foot (LF) or by each (EA) micropile. Included in this bid item are the material (reinforcing and grout), equipment, labor and incidentals to construct a micropile. Mobilization and load testing associated with the installation of micropiles may be measured and paid for separately.<br><h2>Cost Information Summary</h2>The following table lists construction cost items that are associated with micropiles, along with approximate cost ranges. Cost ranges are based on data from 2007 through 2010. Readers should carefully examine the project characteristics and constraints and determine to what degree if any these factors may influence the actual cost associated with constructing micropiles. For many micropile applications a working platform will be required. These costs should be included when comparing this technology with others. The cost of the geosynthetic for the working platform is provided in the geosynthetic reinforced embankment <em>cost information</em> document.</p><p><table class='tablepress' id='tablepress-111'><thead><th>Pay Item Description</th><th>Quantity</th><th>Unit</th><th>Low Unit Price</th><th>High Unit Price</th><th>Factors Which May Potentially Impact Costs</th></thead><tbody><tr><td >Micropile</td><td >Greater Than 1,000</td><td >LF</td><td >$175.00</td><td >$300.00</td><td >Cost ranges by the lineal foot are based on limited bid tab data (provided for preliminary budget estimates)
Costs increase as diameter of the micropile increases
Cost of grout materials is sensitive to material specifications and haul distance
Unit costs will decrease as depth increases</td></tr><tr><td >Mobilization</td><td >Greater Than
5,000
</td><td >LUMP SUM</td><td >$25,000</td><td >$50,000</td><td >Mobilization cost increases for distances greater than 500 miles
Phased projects may require multiple mobilizations</td></tr><tr><td >Micropile Load Test</td><td >Greater Than 1</td><td >EA</td><td >$30,000</td><td >$100,000</td><td >Verification tests are on the higher side of the range, while proof tests tend to the lower side of the range</td></tr></tbody></table><h2>Historical Cost Information</h2>A sample of actual project costs is shown in the table below.</p><p><table class='tablepress' id='tablepress-112'><thead><th>Pay Item Description</th><th>Quantity</th><th>Unit</th><th>Low Unit Price</th><th>High Unit Price</th><th>Average Unit Price</th><th>No. of Bids</th><th>Bid Date</th><th>Source/Agency</th></thead><tbody><tr><td >Miscellaneous Micropile at Bridge</td><td >1,100</td><td >LF</td><td >$154.00</td><td >$240.00</td><td >$209.75</td><td rowspan=2 >4</td><td rowspan=2 >4/5/2007</td><td rowspan=7 >Oregon DOT</td></tr><tr><td >Furnish Drilling Equipment Furnish Micropile Equipment</td><td >1</td><td >LUMP SUM</td><td >$40,000</td><td >$94,000</td><td >$63,500</td></tr><tr><td >Furnish Micropile Equipment</td><td >1</td><td >LUMP SUM</td><td >$30,000</td><td >$85,000</td><td >$48,750</td><td rowspan=5 >4</td><td rowspan=5 >8/28/2008</td></tr><tr><td >Furnish and Install Micropiles</td><td >28</td><td >EA</td><td >$6,600</td><td >$9,000</td><td >$8,125</td></tr><tr><td >Micropile Length Variation</td><td >28</td><td >LF</td><td >$200.00</td><td >$270.00</td><td >$217.50</td></tr><tr><td >Micropile Proof Load Test</td><td >2</td><td >EA</td><td >$1,700</td><td >$2,800</td><td >$2,250</td></tr><tr><td >Micropile Verification Load Test</td><td >1</td><td >EA</td><td >$10,000</td><td >$15,000</td><td >$13,000</td></tr><tr><td >Micropiles (Design Provided) 12” Diam.</td><td >1,417</td><td >LF</td><td >$250.00</td><td >$305.00</td><td >$264.25</td><td >6</td><td >3/4/2010</td><td rowspan=5 >New York DOT</td></tr><tr><td >Micropiles (Contractor Designed) Design Load Less Than 100 Ton</td><td >103</td><td >EA</td><td >$6,000</td><td >$15,000</td><td >$10,040</td><td rowspan=3 >5</td><td rowspan=3 >3/18/2010</td></tr><tr><td >Micropiles (Contractor Designed) Design Load 100 Ton or More</td><td >305</td><td >EA</td><td >$7,500</td><td >$20,000</td><td >$12,220</td></tr><tr><td >Micropiles Permanent Casing</td><td >5,952</td><td >LF</td><td >$70.10</td><td >$280.40</td><td >$153.00</td></tr><tr><td >Micropiles (Design Provided) 9.625” Diam. Pipe</td><td >1,597</td><td >LF</td><td >$155.00</td><td >$200.00</td><td >$174.50</td><td >8</td><td >4/15/2010</td></tr><tr><td >Micropile Proof Load Test, 135 Ton</td><td >5</td><td >EA</td><td >$8,600</td><td >$20,000</td><td >$13,550</td><td rowspan=7 >4</td><td rowspan=7 >12/7/2007</td><td rowspan=11 >Michigan DOT</td></tr><tr><td >Micropile Proof Load Test, 90 Ton</td><td >3</td><td >EA</td><td >$9,300</td><td >$17,000</td><td >$12,650</td></tr><tr><td >Micropile Verification Load Test, 135 Ton</td><td >3</td><td >EA</td><td >$32,000</td><td >$40,000</td><td >$34,750</td></tr><tr><td >Micropile Verification Load Test, 90 Ton</td><td >3</td><td >EA</td><td >$28,700</td><td >$35,000</td><td >$30,600</td></tr><tr><td >Micropile, 135 Ton</td><td >181</td><td >EA</td><td >$5,800</td><td >$6,850</td><td >$6,363</td></tr><tr><td >Micropile, 90 Ton</td><td >252</td><td >EA</td><td >$3,800</td><td >$5,300</td><td >$4,600</td></tr><tr><td >Micropile, Mobilization</td><td >1</td><td >LUMP SUM</td><td >$75,000</td><td >$175,000</td><td >$112,500</td></tr><tr><td >Micropile, Load Test, Proof, LRFD</td><td >3</td><td >EA</td><td >$12,000</td><td >$20.200</td><td >$15,893</td><td rowspan=4 >6</td><td rowspan=4 >9/3/2010</td></tr><tr><td >Micropile, Load Test, Verification, LRFD</td><td >1</td><td >EA</td><td >$22,000</td><td >$45,000</td><td >$28,982</td></tr><tr><td >Micropile, Type B, Furnish and Install, LRFD</td><td >60</td><td >EA</td><td >$4,260</td><td >$9,620</td><td >$6,807</td></tr><tr><td >Micropile Mobilization, LRFD</td><td >1</td><td >LUMP SUM</td><td >$26,000</td><td >$162,275</td><td >$70,734</td></tr></tbody></table><h2>Conceptual Cost Estimating Tool</h2>The conceptual cost estimating tool is intended to be used to develop a preliminary project scoping cost estimate. This preliminary estimate can be based on the typical construction cost item values as contained in the Cost Information product or from user specified cost values when such are known. Users should read and understand the information in Cost Information product prior to using the cost estimating tool. You can download the Cost Estimating Tool to open a cost estimating spreadsheet for producing a preliminary project scoping estimate.</p><p><a class="arrow-link" href="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/… the Cost Estimating Tool</a></p></p>