High Risk Work Licence - Concrete Placing Boom (PB) flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

PB licence requirement

A concrete placing boom operator must hold a current high risk work licence for the boom type; employers must verify the licence before allowing operation.

Primary duty of care

The PCBU must ensure health and safety so far as reasonably practicable, including providing safe plant, training, supervision and safe systems of work.

Hierarchy of control

Risk controls ranked from most to least effective: eliminate, substitute, engineer, administrative, then PPE as the last line of defence.

Risk assessment formula

Risk equals likelihood multiplied by consequence; controls must reduce risk to as low as reasonably practicable before work proceeds.

Overhead power line distance

Legislated exclusion distances apply near power lines (commonly 4 m for low voltage and greater for high voltage); de-energise or isolate where possible.

Wind speed limit

Stop boom operations when wind exceeds the manufacturer's rated limit, commonly 20 m/s or 38 km/h; monitor with an anemometer.

Truck-mounted boom

A concrete placing boom mounted on a truck chassis with outriggers, used for mobile pumping and placing of concrete on site.

Separate placing boom

A boom mounted on a mast or tower independent of the pump, used where access is restricted or a fixed placing position is required.

Slew ring

The bearing that allows the turret and boom to rotate horizontally; it must be inspected for wear, cracks and loose bolts.

End hose

The flexible hose at the boom tip, typically 3-5 m long, secured with a safety sling or whip check to prevent uncontrolled movement.

Pre-start inspection

A documented check of fluids, leaks, structure, pins, outriggers, tyres and safety devices before each use; defects must be recorded.

Outrigger setup

Extend outriggers fully onto pads on firm level ground; confirm the spirit level is within tolerance before raising the boom.

Ground bearing pressure

Outrigger load in kilonewtons divided by pad area in square metres gives pressure in kilopascals; increase pad area to reduce pressure.

Load chart use

The load chart gives maximum allowable load at a given radius and boom configuration; never exceed the rated capacity for the current setup.

Stability moment

Moment equals load multiplied by radius; overturning occurs when the load moment exceeds the resisting moment of the base and counterweight.

Boom reach definition

Reach is the horizontal distance from the slew centre to the end hose; capacity decreases as radius increases.

Smooth boom operation

Operate the boom smoothly to avoid sudden starts and stops that cause load swing, hose whip and structural stress on the boom.

No personnel under boom

No personnel may stand under the boom or in the concrete discharge area; barricade the exclusion zone before the pour begins.

Boom not a crane

Never use the concrete placing boom as a crane or hoist, and never allow personnel to ride on the boom or end hose.

Designated signal person

Only one designated signal person should direct the operator; all others relay through that person to avoid conflicting signals.

Stop signal authority

Any person may give a stop signal; the operator must comply immediately and not resume until the signal is cleared.

Radio communication test

Test radio communication before the pour, use a dedicated channel, and stop work if communication is lost until it is restored.

Emergency stop procedure

Activate the emergency stop, stop the pump, and lower the boom to a safe position if possible before evacuating and calling for help.

Power line contact response

Keep everyone clear, do not touch the machine, call the electricity authority, and evacuate to the safe distance until declared safe.

Incident notification

Serious injuries, dangerous incidents and fatalities must be reported to the regulator within the prescribed timeframe, commonly 24-48 hours.

Daily inspection record

The daily pre-start inspection must be documented and retained; safety-critical defects require the machine to be tagged out and removed from service.

Critical inspection points

Structural welds, pins, bolts, hydraulic hoses, slew ring and outriggers are critical inspection points requiring competent person assessment.

Defect reporting

Defects must be reported to the supervisor and recorded; safety-critical defects require the machine to be removed from service until repaired.

Ground condition check

Before setup, check for soft spots, voids, excavations, underground services and recently filled ground that could reduce bearing capacity.

Concrete washout control

Contain concrete washout to prevent environmental contamination; never discharge washout water to stormwater drains or waterways.

Public exclusion zone

Barricade the exclusion zone and keep the public clear of the boom and discharge area throughout the pour.

Site access planning

Plan site access for the boom, outriggers, concrete trucks and washout, and implement traffic management before the pour begins.