UnderpinningHELICAL PULLDOWN™ Micropile is a patented composite end-bearing/friction plate pile well suited for resistance to bending moments and lateral loads in poor soil conditions by transferring load to high end-bearing capacity helical plates. It consists of a steel screw anchor with a 4" to 10" grout column around the shaft above the helical plates.
Foundation RepairSquare-Shaft (SS) HELICAL PIER® Foundation Systems anchors are designed for installation ease and to maximize load capacity of each helix. Shafts and helices are of steel selected for specific installing torques and design loads. Chance screw anchors are effective in compression because soil supports the shafts against buckling.
New ConstructionFor new construction applications, HELICAL PIER® Foundation Systems anchors install as intervals between footing platforms and tie into the rebar gridwork prior to pouring concrete.
For such higher loads as commercial and industrial construction or expansion applications, HELICAL PULLDOWN™ Micropiles may be installed in the same manner as above. That is, at intervals between footing forms and tied into the rebar gridwork prior to pouring concrete.
Tower FoundationsHigh-Strength (HS) INSTANT FOUNDATION® anchors have 3˝-inch-O.D. pipe shafts for resistance to bending moments and lateral loads. Type T/C (Tension/Compression)INSTANT FOUNDATION® anchors have lead sections of 3˝-inch-O.D. pipe and extensions of 8-inch-O.D. pipe with helical couplers. The lead section and extensions bolt together and have a maximum installation torque rating of 11,000 ft.lb.
Monitoring installation torque contributes to production control. An empirical factor (usually 7ft.-1) is multiplied times the average torque over the final 3 feet of installation to estimate ultimate capacity.
For retaining projects, Chance screw anchors can be matched to soil and heavy tension loads in the same way HELICAL PIER® Foundation Systems are for compression applications.
Soil Nailing - SOIL SCREW® Retention Wall System uses screw anchors as bearing devices as compared to grouted anchors which rely on friction.
Tieback - Chance screw anchors for tiebacks in soldier-pile/waler walls come with shaft sizes and single- or multi-helix plate diameters selected for job-specific requirements.
Lighting and ConstructionNon-extendable INSTANT FOUNDATION® anchors are produced with high-strength pipe shaft for resistance to bending moments and installation torque. They often can be installed through macadam surfaces.
Typical applications include parking lots, street and highway lighting, architectural lighting, sign and column supports, and building foundations.
Backhoes and skid-steer loaders fitted with hydraulic torque motors, digger-derrick trucks, and other such conventional rotary equipment are ideal for installing these foundation anchors.
Geo-EnvironmentalFor these applications, anchors principally are specified from the following groups:
Special termination brackets and associated hardware items are also available for certain applications.