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G3IGROUP <br /> ,�_ <br />� <br /> j PIER SYSTEM <br /> I <br />' HELICAL PIERS <br /> I�� A Helical Pier is comprised of a steel shaft with one or more helices attached to the steel shaft. The I I� <br /> shafts typically range from 1'/ to 2 '/ inch rounded comer steel squares to 2 7/8 to 8 5/8 inch steel <br />, pipes. The helices generally range in thicknesses from 3/8 to 1/2 inches, and range from 6 to 16 <br /> inches in diameter. The helical plates are formed as a true helix with uniform pitch. Helical piers are <br />; designed so that the smallest diameter helix is on the leading end of the shaft, followed with larger or <br /> I equal diameter helices. The helices are utilized to transfer load into the soil by the development of j <br /> bearing pressure following installation. I <br /> I <br />' Helical piers are installed using high-torque hydraulic equipment that provides rotational energy and � <br /> I <br /> downward pressure necessary for successful pier installation. The piers are rotated into the ground to <br /> the specified bearing depth. Helical piers are may be designed to resist both uplift and compression <br /> loads. The center shaft of the piers is used to transfer a�aal loads to the helix plates. The helices are I <br /> utilized to transfer load into the soil by the development of bearing pressure following installation. � <br /> i <br /> The helical pier capacities have been determined based on the subsurface conditions encountered, � <br /> and our extensive e�erience with similar conditions. Helical piers anchors with an 8-10-12-inch plate <br /> configuration are e�ected to attain an allowable compressive capacity on the order of 16 kips at an <br /> embedment depth of at least 15 feet below�the existing ground surface elevations. ; <br /> It is anticipated that the helical piers will be embedded into the underlying SAND Based on this <br /> information; we e�ect the total settlements will be appro�amately less than %2 inches and differential �, <br /> settlements on the order of 50 percent of the total settlements. <br />, G3 Group recommends that the portion of the e�asting structure illustrated in the attached figure be <br /> stabilized with the use of an underpin foundation system. G3 Group recommends the stabilization <br /> program follow the guidelines included in this report. <br /> In order to allow time for re-distribution and equilibration of stress induced bythe underpin program, it <br />�� is recommended that final cosmetic repairs of cracking and other distress to the house not be <br /> performed for a period of two months following the installation of the underpins. <br />� ! I <br /> I <br /> Florida Office: Phone: 727.376.7833 Tennessee Office: , <br /> 2410 Success Drive, Suite 7 Faz�: 727-376-2758 45 Oak Valley Drive ; �I <br /> Odessa, FL 33556 Email:info(u),�eo3�roup.com Spring Hill,TN 37174 , I <br /> Web: www.�eo3�roup.com , ', <br />