High Risk Work Licence - Bridge and Gantry Crane (CB) case studies
High Risk Work Licence - Bridge and Gantry Crane (CB) · Put your knowledge to work in context.
The Bridge and Gantry Crane (CB) licence is a high risk work licence that authorises you to operate bridge and gantry cranes, including overhead travelling cranes, in Australian workplaces. It is aimed at people who already work around cranes or want to move into crane operation: doggers and riggers, warehouse and yard staff, manufacturing and precast plant operators, and maintenance personnel who use cranes to move loads. The High Risk Work Licence - Bridge and Gantry Crane (CB) case studies are 5 cases and about 2,717 words.
1Dual-Crane Lift with Unequal Load Share
Two 10 t overhead bridge cranes share a runway in a workshop. Each has its own pendant control, and there is no anti-collision or load-sharing system.
763 words, about 4 min2Gantry Crane on Soft Ground Beside a Trench
A rail-mounted gantry crane is being used in a yard to place precast concrete panels into a 3 m deep service trench. The crane runs on temporary timber bearers laid over compacted fill.
489 words, about 2 min3Overload Alarm During a Long Travel Move
A 25 t capacity double-girder overhead crane with a 22 t load cell and overload alarm is moving a 21 t machined casting along a 40 m runway. The load is slung on a four-leg chain sling at 60 degrees included angle, and the crane's load display reads 23.5 t.
548 words, about 3 min4Limit Switch Failure on a Gantry Crane
A semi-gantry crane runs on a rail along a wall and on a rubber-tyred leg on the open side. During a shift, the operator notices the long-travel limit switch does not stop the crane at the end of the runway; the crane overruns by about 300 mm before the operator applies the brake manually.
474 words, about 2 min5Communication Breakdown During a Blind Pick
A bridge crane operator in a cab must pick a 3 t bundle of steel from a storage bay that is hidden behind a rack of tall pallets. The rigger on the floor is using hand signals, but the operator cannot see the rigger's hands from the cab because of the rack.
443 words, about 2 min