TILT-UP CONSTRUCTION - Brock White
TILT-UP CONSTRUCTION - Brock White TILT-UP CONSTRUCTION - Brock White
Ground Release IISystemT-81 Heavy Duty Ground ReleaseII InsertThe Dayton Superior T-81 Heavy Duty Ground Release II Insert is similar to theT-41 insert but is designed to utilize a 1” diameter anchor. The insert is furnishedwith the anchor, wire base and plastic void former assembled and ready to use.The T-81 insert is sized 1/8” less than the panel thickness and is equipped withantennae for quick locating.Lifting SystemsCoil InsertsTo Order:Specify: (1) quantity, (2) name, (3) panel thickness,(4) bottom face exposed aggregate or foam formlinerthickness, if required.Example:150, T-81 Heavy Duty Ground Release II inserts for 10”panel with 3/4” exposed aggregate.T-81 Heavy Duty GroundRelease II InsertT-81 Heavy Duty Ground Release II Insert Selection ChartStructural Panel8” 8-1/2” 9” 9-1/2” 10” 10-1/2” 11” 11-1/2”ThicknessGround Release IIAnchor LengthInsert SafeWorking Load (lbs.)6-3/4” 7-1/8” 7-1/8” 7-1/8” 7-1/8” 7-1/8” 7-1/8” 10”15,500 18,200 18,200 19,100 20,000 20,900 21,800 22,800S.W.L. provides a safety factor ofapproximately 2 to 1 in 2,500 psi normalweight concreteT-83 Heavy Duty Ground ReleaseII HardwareThe Dayton Superior T-83 Heavy Duty Ground Release IIHardware is used with the T-81 insert to lift and handlelarge tilt-up panels. The high strength, efficient systemoffers quickness and safety.Note: It is a good practice to have an extra hardware uniton the job site in case there is a need to replace one in use.T-83 Heavy Duty Ground Release II HardwareTo Order:Specify: (1) quantity, (2) name.Example:9, T-83 Heavy Duty Ground Release II Hardware units.Minimum Insert DistancesSafety Notes:15"Minimum15" Minimum15’15" MinimumT-8115"Gyro-Tilt T-49MinimumPlusGyro TiltPlus Warning! Inserts must be properlylocated in relation to the center ofgravity of the panel. This work shouldbe performed under the direction of aregistered professional engineer.6" Minimum10 oMaximumLedger orProjection15"Minimum6" MinimumLedger orProjectionLedger orProjection6" Minimumto edges, corners, openings 6" Minimum and ledgers, and at15"MinimumLedger orProjectionSafe use of the Ground Release II System requiresthe inserts to be positioned so that the arrows onthe direction label point to the top and bottom ofthe panel (parallel to the sides of the panel).The inserts must be properly located in relationdistances allowing the development of a full concreteshear cone. Minimum distances are shownin the sketches above. Placing an insert closer toan edge than the minimums shown may reducethe effective concrete shear cone and reduce theinsert’s safe working load. Lifting inserts must beproperly wired in place so that the vertical axis ofthe insert is perpendicular to the panel surface.Care must be taken to avoid displacement of theinserts during concrete placement and screedingoperations.Do not weld to a lifting insert. Welding causesembrittlement and can result in an insert failure.See related safety information concerning weldingon inside front cover.38 04-09
Ground Release IISystemHow to use the Ground Release II System - T-83 HardwareDo Not Use For Edge LiftingDo Not Use This System On Top Surface, Seeded, Exposed Aggregate 3/4” or Larger.Precheck all insert holes with hardware prior to erection date, following instruction steps 2, 3 and 4,so that during tilting, proper hardware action is assured. See page 36 for proper procedure for removalof plastic recess plug.Install the insert so the directional arrow on the plastic recess plug1. points to the top or bottom of the panel. Wire tie the insert intoposition using a short length of additional reinforcing steel (rebar)placed tight against each side of the insert. Next, near each endof the plastic void former, secure a tie wire to one of the additionalrebars, running the wire over the top of the plastic void former andback down, securing it to the additional rebar on the other side ofthe insert. Be sure to run the tie wire between the metal ring and theplastic void former as shown in the sketch to the right.Note: The short length of rebar recommended is an aid to prevent theinsert from moving during concrete placement. When this rebar is addedfor insert stability, it should be placed against the vertical portion of theinsert and at least 1” away from the insert’s foot. This extra rebar is notrequired to develop the insert’s safe working load.Lifting SystemsCoil InsertsBailRelease ArmRelease ArmBailRelease LineMain BodyTop of PanelReleaseArmRelease LineThe various parts of the T-832. Ground Release II Lifting Hardwareare shown above.To install the lifting hardware onto3. the insert, hold the hardwareby the bail and release arm, andlower it onto the head of the insert.Check to make certainthat the release arm points to thetop of the panel.Lower the release arm until the4. arm comes in contact with the panel.Lay the release line along side of thelifting hardware so that the line goesto the bottom of the panel. With thecrane lines attached, the panel isnow ready for lifting.As the panel is lifted, the release5. arm is trapped between the paneland the crane line, which insuresthat the lifting hardware cannot beprematurely released. Brace andsecure the panel into position.The crane line should be6. slackened slightly to permitthe release of the lifting hardware.To release the lifting hardware,apply a single downward force tothe release line.The lifting hardware remains in7. the open position, ready to belowered to the ground and attachedto the next panel.Warning! The crane line and bail of the lifting hardware must be turned in the direction of the cable forces before the lifting operationbegins. The crane line must not be allowed to apply a sideward force on the bail, as this condition is dangerous and could lead topremature failure of the hardware or insert.04-0939
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Ground Release IISystemHow to use the Ground Release II System - T-83 HardwareDo Not Use For Edge LiftingDo Not Use This System On Top Surface, Seeded, Exposed Aggregate 3/4” or Larger.Precheck all insert holes with hardware prior to erection date, following instruction steps 2, 3 and 4,so that during tilting, proper hardware action is assured. See page 36 for proper procedure for removalof plastic recess plug.Install the insert so the directional arrow on the plastic recess plug1. points to the top or bottom of the panel. Wire tie the insert intoposition using a short length of additional reinforcing steel (rebar)placed tight against each side of the insert. Next, near each endof the plastic void former, secure a tie wire to one of the additionalrebars, running the wire over the top of the plastic void former andback down, securing it to the additional rebar on the other side ofthe insert. Be sure to run the tie wire between the metal ring and theplastic void former as shown in the sketch to the right.Note: The short length of rebar recommended is an aid to prevent theinsert from moving during concrete placement. When this rebar is addedfor insert stability, it should be placed against the vertical portion of theinsert and at least 1” away from the insert’s foot. This extra rebar is notrequired to develop the insert’s safe working load.Lifting SystemsCoil InsertsBailRelease ArmRelease ArmBailRelease LineMain BodyTop of PanelReleaseArmRelease LineThe various parts of the T-832. Ground Release II Lifting Hardwareare shown above.To install the lifting hardware onto3. the insert, hold the hardwareby the bail and release arm, andlower it onto the head of the insert.Check to make certainthat the release arm points to thetop of the panel.Lower the release arm until the4. arm comes in contact with the panel.Lay the release line along side of thelifting hardware so that the line goesto the bottom of the panel. With thecrane lines attached, the panel isnow ready for lifting.As the panel is lifted, the release5. arm is trapped between the paneland the crane line, which insuresthat the lifting hardware cannot beprematurely released. Brace andsecure the panel into position.The crane line should be6. slackened slightly to permitthe release of the lifting hardware.To release the lifting hardware,apply a single downward force tothe release line.The lifting hardware remains in7. the open position, ready to belowered to the ground and attachedto the next panel.Warning! The crane line and bail of the lifting hardware must be turned in the direction of the cable forces before the lifting operationbegins. The crane line must not be allowed to apply a sideward force on the bail, as this condition is dangerous and could lead topremature failure of the hardware or insert.04-0939
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