CSCS Self-Erect Crane key terms

UK regulations requiring lifting equipment, including cranes, to be strong enough, stable and marked with safe working limits, and to be thoroughly examined at set intervals by a competent person.

UK regulations requiring work equipment to be suitable for its intended use, maintained in safe condition, inspected where needed, and operated only by trained and competent people.

A person who has the training, knowledge, experience and practical ability to carry out the assigned task safely and correctly, such as inspecting, erecting or operating a crane.

The individual with overall responsibility for planning and controlling a lifting operation, including selecting equipment, producing the lift plan and confirming personnel and site readiness.

A crane designed to be transported, assembled, raised into its working position and dismantled using its own integral mechanisms, with minimal or no separate mobile crane assistance.

A tall slewing crane with a vertical mast and horizontal or luffing jib, used to lift loads over a wide radius on construction sites, often fixed to a base or ballasted foundation.

The large bearing that connects the crane's upper structure to its base or mast, allowing the jib and machinery deck to rotate horizontally under load.

Ballast fixed to the rear of the crane's upper structure or base to balance the load moment and help keep the crane stable during lifting and slewing.

An extendable leg with a pad that spreads the crane's weight over a wider footprint, reducing ground pressure and improving stability during lifting.

The force per unit area that the crane's feet, tracks or outrigger pads exert on the ground beneath, which must stay below the ground's safe capacity.

The use of pads, mats or grillages under outriggers or tracks to distribute crane forces over a larger area and reduce ground bearing pressure.

The maximum load per unit area that the ground or a foundation can safely support without excessive settlement, shear failure or collapse.

A structured survey of the site before crane use, covering ground conditions, access, overhead hazards, underground services, space for erection and proximity to excavations or slopes.

The process of assembling the crane, including positioning the base, fitting mast sections, jib and counterweights, and raising it to its working configuration in line with the manufacturer's instructions.

The operation of raising the crane's mast or tower by adding or jacking sections, increasing its height to suit the building or lifting requirement.

Using hydraulic rams built into the crane to raise or lower the mast or jib sections during climbing, erection or dismantling, with the load controlled at all times.

The controlled reverse of erection, where the crane is lowered, section by section, and removed from site following the manufacturer's sequence and a written method statement.

A written document setting out the safe sequence of work, the equipment and personnel needed, the risks identified and the control measures for a specific task such as crane erection.

The ability of the crane to resist overturning or tipping under the combined effects of load, jib radius, wind and out-of-level ground, with a margin of safety built in.

The turning effect produced by a load, calculated by multiplying the load weight by its horizontal distance from the crane's tipping or slewing axis.

The manufacturer's table or graph giving the maximum safe load for each working radius, jib configuration and sometimes wind condition for a particular crane.

The horizontal distance from the crane's slewing axis to the centre of the load, which increases as the jib is luffed down or the trolley moves out.

The maximum load that the crane or lifting accessory may safely handle in a given configuration, allowing for the rated capacity and any applicable reduction factors.

The maximum load stated by the manufacturer for a specific crane configuration and radius, before any site-specific reductions such as wind or ground conditions are applied.

Reducing the crane's permitted load below the chart value to account for factors such as high wind, poor ground, out-of-level conditions or a non-standard configuration.

The arrangement and attachment of slings, shackles, hooks and other lifting gear between the crane hook and the load, prepared so the load is balanced and secure.

The technique of attaching slings to a load, choosing the correct type and number of legs, and positioning them so the load is stable and the sling angles are acceptable.

The angle between a sling leg and the horizontal or vertical, which affects the tension in each leg; flatter angles increase leg tension and reduce the safe working load.

Working Load Limit: the maximum mass that a sling, shackle or other item of lifting gear is designed to lift in a particular configuration, marked on the item.

A trained person who guides the crane operator during lifting, using agreed signals and keeping the load and exclusion zone under observation, and who is the only person giving signals.

A competent person responsible for transmitting clear, agreed signals to the crane operator, either by hand, radio or other means, to control the movement of the load.

The use of two-way radios on an agreed channel and protocol between the operator, signaller and other personnel, with a clear fallback method if the radio fails.

A marked area beneath and around the crane and its slewing radius where unauthorised people are kept out to prevent injury from falling loads or moving parts.

A visual and functional inspection carried out before each shift or use, covering wires, hooks, brakes, limiters, controls, fluids and structural condition, with defects reported and recorded.

A detailed inspection by a competent person at statutory intervals or after significant alteration, to confirm the crane remains safe and to record any defects or required actions.

A device or display on the crane that shows the load being lifted or the percentage of safe working load in use, warning the operator before an overload occurs.

A safety device that prevents the crane from lifting more than its rated capacity by stopping the lifting motion or sounding an alarm when the limit is approached.

The maximum wind speed at which the crane may be operated, erected or left unattended, as specified by the manufacturer and monitored with an anemometer on site.

An instrument mounted on the crane that measures wind speed and often triggers alarms or cut-outs when the permitted limit for safe operation is exceeded.

A planned procedure for bringing a suspended load or the jib down safely during a power failure, high wind or other emergency, using backup power or controlled release.