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Mobile Cranes (with no folded or lattice jibs) (Responsibilities of other…
Mobile Cranes (with no folded or lattice jibs)
Mobilize the machine to the destination
Not much discussed about this. Maybe it is the same as driving a bus?
Some mobile cranes can move while lifting an object, but this is not common and not all mobile cranes can do it. Should we ignore this?
Lift the object from the original place to the destination
Maintaining the balance
Determining maximum permissible windspeed with respect to both surface and weight of the lifted object
In any circumstances, it should not exceed 36 km/hour
Knowing the permissible safe load capacity (weight of the object divided by load-radius)
Start giving visible and audible warning when nearing 95% of the permissible weight (Hongkong). India has 85%, Australia has 75%.
Knowing the weather condition
Wind speed and direction
Knowing the ground condition
Steepness, structure of the ground (soft or hard ground), and presence of ice in the ground.
Calculate the pressure to the ground by the crane.
Knowing real-time weight and height of the lifted object
Ensuring the entire mobile crane is not moving unexpectedly
Hit the fail-safe vehicle break and motion limit devices whenever necessary
Outriggers have been retracted at the correct place.
Knowing the permissible erection/angle of the boom
Knowing the height of elevated outriggers. (All wheels should not touch the ground)
Knowing both position and weight of the counter-weight
Knowing the permissible load-radius (with respect to the weight of lifted object, angle and extension of the boom, height of the lifted object, and steepness of the ground)
Avoiding other objects
Knowing the boundary of the operation (determined by the presence of fences)
Knowing the location of other ground workers
Knowing the space availability for slewing motion and also placing the outriggers
Not less than 0.6 meters
Projecting the swinging of the lifted object.
Hit the swing brake whenever necessary
No one should be within the danger area (twice of the crane's width) during the lifting operation.
Knowing the presence of underground/occluded facitlities within the operational area.
Knowing the location of fences or barriers (if any)
Knowing the location of overhead structures (e.g. buildings, towers, power lines, etc).
In case of power lines, 15 meters for steel towers, 9 meters for wooden poles, and 6 meters from cables
No one should be present below the lifted object
Moving the lifted object
Knowing the destination for the lifted object
Knowing the level of pressure power
Hit the fail-safe brake when there is a loss of power
Knowing the angle of the boom. This has to be displayed very close to the operator.
Knowing the fuel level and lubrication
Knowing the lifting points for heavy loads, e.g. more than 2 tonnes. (Precise lifting points are not needed for light loads).
Ensuring there is sufficient level of ropes on the hoisting drum
Warning when there is less than 3 full wraps of ropes on the hoisting drum. In some places, 2 full wraps.
Knowing the signals given by slingers and signalers (e.g. giving clearance signal)
Responsibilities of other workers
Maintain parts and the entire mobile crane (Inspectors)
Correctly assemble/disassemble the mobile crane (Inspectors)
Knowing the characteristic of the load (Slingers)
Selecting suitable lifting gears depending on the lifting operation (Slingers)
Establishing proper fencing around the lifting zone.
Placing the pads for outriggers
Hooking/unhooking the load with the rigger (Slingers)
Giving signals to the operator during the lifting operation (Signallers)
Selecting the suitable type of mobile cranes depending on the lifting operation (Owners/Managers)
Putting chocks on tires of wheel-mounted cranes
Providing adequate lighting for operations in dark environments.
Determining the suitable placement for the mobile crane.
Putting a ground barrier (safety clearance) around power lines
Transporting the crane
Leading the lifted object to the destination (pulling the load should be avoided)
Securing the oject before lifting, e.g. the angle between sling legs should not exceed 90 degrees
Ensuring that the working environment will not harm the operation, e.g. dust-laden, moisture-laden, or hazardous locations.
Prevent the lifted object from excessive motions by using tag lines attached on the lifted object (Slingers)