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SECTION 316613 – HELICAL PIERS <br />Orange County Waste and Recycling For Proposal – Not for Construction <br />Metal and White Goods Retaining Wall Repair 31 66 13 - 3 <br />DAA PN R00592-204ST2 November 2020 <br />PART 3 - EXECUTION <br />3.1 INSTALLATION <br />A.Installation Procedures <br />1.The helical pier shall be positioned as shown on the project drawings. <br />Proper angular alignment shall be established at the start of the installa- <br />tion. <br />2.Helical pier shall be installed in a smooth, continuous manner. The rate of <br />pier rotation shall be in the range of 5 to 20 revolutions per minute. <br />3.Sufficient down pressure shall be applied to advance the pier. <br />4.Extension material may be required to position the pier to the depth re- <br />quired. Extensions shall be coupled to the helical pier by using high <br />strength bolts, installed and tightened to approximately 40 ft-lbs of torque. <br />5.If underground obstructions are encountered during installation, the Dealer <br />shall have the option of removing the obstruction if possible or relocating <br />the helical pier. This latter option may require the relocation of adjacent <br />piers. <br />B. Termination of Installation <br />1.Helical piers shall be installed to the minimum torque value corresponding <br />to the load capacity indicated for each pier. <br />2.Maximum installation torque shall at no time exceed the torque rating of <br />the helical pier shaft specified for the project. <br />3.Minimum depth of installation shall be as indicated on the drawings pro- <br />vided the top helix is located at least 5 feet below the surface. <br />4.Pier installation shall be terminated provided the minimum installation <br />torque and minimum depth requirements have been satisfied. <br />5.If the minimum torque requirement has not been satisfied at the minimum <br />depth level, the Dealer shall have the following options: <br />i.Install the pier deeper using additional extensions until the specified <br />torque level is obtained. <br />ii.Remove the existing pier and install a pier with larger and/or more <br />helices. This revised pier shall be installed at least 3 feet beyond <br />the termination depth of the original pier. <br />iii.Add additional piers. <br />6.If the maximum torque rating of the pier and/or the installing equipment <br />has been reached before reaching the minimum required depth, the Deal- <br />er shall have the following options. <br />i.Terminate the installation at the depth obtained <br />ii.Remove the existing pier and install a pier with smaller and/or fewer <br />helices. The revised pier shall be installed at least 3 feet beyond <br />the termination depth of the original pier. <br />DocuSign Envelope ID: B2D44CC3-6321-4EF3-AFC6-547186A1261E