Rigging Guide

Regulatory RequirementsAS3850: 2003 and the National Code of Practice for Precast and Tiltup Construction require that riggingsystems be designed to distribute loads equally between all anchors in precast components. If loads are notequally distributed, damage or failure can occur to the precast components, the rigging components or both.

Rigging Geometry affects the loads in the rigging equipment and the precast components being lifted.Common rigging errors can result in loads of twice the design loads. A common mistake is to lift acomponent designed with four equally loaded points with four fixed length slings attached to a ring or hook.The small variations in the lengths of the rigging result in the load in this case only being shared by two of theslings, resulting in double the load applied to the anchors and the concrete surrounding the anchor. Whenlifting thin precast panels this has been the cause of many failures.

Rigging with multiples of three lifting points (except for the special case shown) is not recommended by codes.

T T

P=4T

T T

T T

P=2T

T

2T 2T 2T

P=6T

TT

T

P=3T

c.g.

Rigging Diagrams for Equalised LoadingCorrect rigging for equalised anchor loading

2 points

4 points

2 fixed lengthEqual loads in each

3 pointsOnly for special cases!

Special Case! 3 fixed legslings equally distributed

around the centre of gravity

2 sheaved slingsEqual loads in each

Flat lift - equalised

c.g.

Always ensure that the centre ofgravity (centroid) of the objectbeing lifted lies below the centreof lift of the lifting anchors toavoid instability and topplingduring lifting.

Flat lift - equalised

T T

P=2T

P=2

P=4T

T T T T

2T2T

Rigging Guide

Recommended Rigging Configurations when Facelifting with Unilift QwikTilt systems

Minimum 2D Minimum 3C + DMinimumC + 300mm

D

C

D

2 x 1 2 x 2 4 x 2

2 x 4

Minimum 4.5D or4.5E whichever isthe greater

Minimum 3D

D

E

Minimum 3D

4 x 2

The maximum slingangle q should bespecified in thelifting design.

Sheave Sheave

Sheave Sheave

2 point edge lifting:For tilting up panels by their long edge, e.g.from the casting bed. For typical 150mmthick panels less than 5 metres long.

Preferred 4 point equalised edge lifting:With load equalising beam and sheaved slings.For typical 150mm thick panels5 - 10 metres long.

Non-preferred 4 point equalised edge-lifting:With sheaved slings

Recommended Rigging Configurations when Edge-lifting panels with EdjPro systems

q

Transporting in the factory, handling and erection by top-lifting from the edge

2 point 4 point

Main Winch:Connect two standard EdjPro clutches or EdjPro Hammerlock clutches to the EdjPro top-lift erection anchors.

Auxiliary Winch:Connect an EdjPro clutch with locking ring arm away from the point of lift to the spin-up, or tail-lift EdjProanchor which is located at approximately of the long edge.

Standard EdjPro clutches EdjPro Hammerlock clutches

Mid-air Panel Rotation Spin-up and Erection using EdjPro anchors and clutches

Spin-upEdjPro Anchor

AuxiliaryWinch

MainWinch

Top-liftEdjPro Anchors

Turn the panel bytransferring the load tothe main hoist.

Remove the spin-up clutch.Hoist the panel into position anddisconnect the top lift clutches,preferably with the aid of anelevated work platform.

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Rigging Guide

Many accidents and failures have occurred with these rigging configurations because of the difficulty ofensuring that the loads are evenly distributed.

Flat lifting with three points is possible when they areequi-distant from the centre of gravity.

TT

T

c.g.

Special Case! 3 fixed leg slings equallydistributed around the centre of gravity

This can be OK but it is generally safer forstability to lift with 4 fixed leg slings anddesign for sharing the load on 2 of the4 points.

T

2T

T

T

2T 2T 2T

P=6TEqual Load

P=4TCentral AnchorDouble Loaded

P=2T P=2T

T T T T

0

0 TT

0

0

0

0

4 point rigging with fixed length slings developsunequal loads i.e. load is shared on two slings only

Flat lift4 x fixed slingsno equaliser

4 equal length slings unequal loads. Paneltries to bend to equalise the loads. Thisoverstresses the panel causing cracking.

T T

2T

T T0 0 0 0

Fixed leg slings can lead to indeterminate loading

Rigging diagrams showing unequal loading

Rigging with multiples of 3 slings isparticularly difficult and not recommended