Control the temporary load path before allowing the next movement. This revision links the existing crane-specific hazards to evidence at connection opening, each hydraulic stroke, mast insertion and final release. The eight rows group activities; they do not prescribe the mechanical sequence for an unidentified crane.
This is reference content written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and site authorisation are required before use.
Stop work
Stop for missing support confirmation, abnormal pressure or movement, guide binding, loss of communication, weather outside the approved envelope, an incomplete connection or entry into the exposure zone. Stop progressing the sequence; keep the system in its prescribed holding condition.
1. Legal and technical scope
| Basis | Application limits |
|---|---|
| Safe Work Australia - Tower cranes model Code | Official model-code page; check implementation with the local regulator. Not a national workplace approval. |
| SafeWork NSW - Erecting, climbing and dismantling | Planning, competent supervision, component handling and manufacturer instructions; jurisdiction-specific guidance. |
Australia: model WHS material requires local adoption checks; Victoria has a separate OHS framework. NSW guidance is a state reference. AS 2550.4:2025 remains in the preserved title, but its licensed text was not reviewed. Confirm jurisdiction, applicable licence classes and SWMS duties for the actual work.
2. Scope and required inputs
Use the exact manufacturer climbing manual, approved configuration and jurisdiction-specific engineering documents. No actual model manual or site calculations were supplied. Do not infer wind limits, torque, support capacity, free-standing height or a pin-removal sequence from this guide. A support may carry hydraulic load during a prescribed stroke; mechanical transfer is required at the stages specified for that system.
| Required input | What to verify |
|---|---|
| Plan | Manual revision; Tie design; Crew authority; Does the climbing procedure match the installed crane and climbing system? |
| Weather | Wind basis; Boundary map; Securing method; Is the controlling wind limit and measurement basis recorded on the permit? |
| Inspect | Test record; Support condition; Rescue readiness; Have hydraulic inspections and required functional tests been accepted?; Does the exclusion-zone drawing match the actual crane and site configuration? |
| Balance | Is the trolley position physically measured and independently checked?; Does the slew-restraint arrangement match the manufacturer procedure?; Are counterweight, ballast and balance-load configurations correct?; Are level, plumb and climbing-frame clearances within specified tolerances? |
| Each stroke | Are all mechanical supports fully seated and retained as specified?; Are hydraulic pressure, cylinder position and guide alignment normal?; Are personnel clear of the potential movement, crush and shear zones?; Has the designated checker released the hold point for this stroke? |
| Insert | Does the mast-section identification match the approved crane configuration?; Has all lifting and transfer equipment passed inspection?; Are end stops, retainers and mast-section restraints properly installed?; Are workers maintaining clearance from all pinch and crush points? |
| Connect | Are hardware type, grade, dimensions, condition and reuse criteria verified?; Is the required torque or tension equipment within calibration?; Are all bolts, pins, nuts, washers and retainers completely installed?; Has an independent competent checker accepted the connections? |
| Release | Does the completed configuration match the approved climbing plan?; Are all temporary devices and loose materials accounted for?; Are inspection, test and commissioning records complete?; Has formal return-to-service authorisation been issued? |
3. Eight-stage JSA
| Job stage | Hazards and effects | Failure factors | Technical and procedural controls | Site verification | P | S | R | A |
|---|---|---|---|---|---|---|---|---|
| 1. Plan | 1. Wrong model2. Tie failure3. Crew conflict4. Incorrect crane or climbing procedure causing structural instability or collapse | 1. Wrong revision2. Unchecked support3. Unassigned command4. Using a generic SWMS without the current crane-specific climbing procedure | 1. Match crane and frame2. Approve temporary states3. Assign one director4. Verify the crane make, model, serial number, configuration and climbing-system identity | 1. Manual revision2. Tie design3. Crew authority4. Does the climbing procedure match the installed crane and climbing system? | ||||
| 2. Weather | 1. Wind torsion2. Falling objects3. Collision4. Wind or gusts producing uncontrolled slew, mast binding or climbing-frame racking | 1. Ground-only reading2. Open boundary3. No securing plan4. Applying an assumed 35 km/h limit without confirming the manufacturer value and measurement basis | 1. Set model wind limits2. Control full exposure zone3. Plan safe interruption4. Record the manufacturer-defined mean, sustained or gust wind limit and apply any lower engineered or site limit | 1. Wind basis2. Boundary map3. Securing method4. Is the controlling wind limit and measurement basis recorded on the permit? | ||||
| 3. Inspect | 1. Hydraulic drift2. Guide failure3. Falls4. Hydraulic hose, valve or cylinder failure causing uncontrolled movement; Dropped objects striking personnel or members of the public | 1. Leaking circuit2. Worn support3. Unsafe platform4. Skipping hydraulic holding, leak and safety-device checks; Establishing an arbitrary exclusion zone that does not cover the credible exposure area | 1. Inspect valves and hoses2. Check guides and supports3. Verify access and rescue4. Inspect cylinders, hoses, fittings, check valves, pressure-limiting devices and emergency controls; Establish a barricaded exclusion zone based on the drop, swing, transfer and collapse envelopes | 1. Test record2. Support condition3. Rescue readiness4. Have hydraulic inspections and required functional tests been accepted?; Does the exclusion-zone drawing match the actual crane and site configuration? | ||||
| 4. Balance | 1. Fore-and-aft imbalance causing mast binding, frame tilt or excessive guide-roller loading2. Unintended jib rotation while the normal mast connection is released3. Incorrect trolley radius or balance load generating an overturning moment4. Collision with adjacent cranes, structures or electrical infrastructure | 1. Positioning the trolley by visual estimate rather than manufacturer data2. Assuming every crane requires the same mechanical slew-lock arrangement3. Relying on a brake that is not approved as the climbing restraint4. Changing counterweight or ballast without engineering acceptance | 1. Position the trolley and any balance load at the exact manufacturer-specified climbing radius2. Orient the jib and counter-jib as required by the approved procedure3. Apply the crane-specific slew brake, locking pin, locking bar or other approved restraint4. Verify balance, level, plumb and guide clearances before releasing structural connections | 1. Is the trolley position physically measured and independently checked?2. Does the slew-restraint arrangement match the manufacturer procedure?3. Are counterweight, ballast and balance-load configurations correct?4. Are level, plumb and climbing-frame clearances within specified tolerances? | ||||
| 5. Each stroke | 1. Climbing dog, pawl, shoe or support slipping from its bearing point2. Hydraulic ram side-loading, buckling, leakage or overextension3. Guide roller derailment, frame racking or mast-chord damage4. Falls, crushing and trapping at moving climbing-system interfaces | 1. Retracting or unloading the cylinder before support engagement is confirmed2. Relying on hydraulic pressure alone where mechanical support is required3. Continuing after abnormal pressure, noise, movement, leakage or misalignment4. Placing workers within crush or shear zones during load transfer | 1. Follow the approved stroke-by-stroke jacking and load-transfer sequence2. Verify all specified pawls, dogs, shoes, pins, wedges or supports before changing the load path3. Use one designated command authority and an agreed emergency-stop signal4. Stop immediately for asymmetric movement, binding, pressure loss, leakage or incomplete engagement | 1. Are all mechanical supports fully seated and retained as specified?2. Are hydraulic pressure, cylinder position and guide alignment normal?3. Are personnel clear of the potential movement, crush and shear zones?4. Has the designated checker released the hold point for this stroke? | ||||
| 6. Insert | 1. Rigging failure or uncontrolled displacement of the suspended mast section2. Collision with the mast, climbing frame, building or assisting crane3. Transfer trolley, monorail, hoist, stop or retainer failure4. Hand and body crushing at chord, flange, pin and connection interfaces | 1. Using uninspected lifting gear or personnel without the required HRW licence2. Using unapproved slewing or crane movement to force alignment3. Operating the transfer system without positive end stops or retainers4. Placing hands between mating structural surfaces | 1. Use authorised doggers and riggers holding the licence class required for their work2. Inspect lifting points, slings, shackles, transfer rails, trolleys, hoists, stops and retainers3. Control the section with approved taglines, guide pins or hands-free alignment tools4. Secure the mast section against movement before detaching lifting accessories | 1. Does the mast-section identification match the approved crane configuration?2. Has all lifting and transfer equipment passed inspection?3. Are end stops, retainers and mast-section restraints properly installed?4. Are workers maintaining clearance from all pinch and crush points? | ||||
| 7. Connect | 1. Mast separation caused by missing, incompatible or incorrectly installed hardware2. Bolt or thread failure caused by uncontrolled tightening or incorrect lubrication3. Incomplete pin engagement or missing locking devices4. Dropped impact tools, sockets, pins, bolts or torque equipment | 1. Assuming all mast bolts must be new OEM parts without checking the controlling specification2. Using an impact wrench as the final acceptance method where calibrated tensioning is required3. Using generic torque values or treating matchmarks as proof of bolt preload4. Changing the structural load path before connection acceptance is complete | 1. Use hardware accepted by the manufacturer or approved engineering procedure2. Apply the specified reuse criteria, lubrication condition, tightening sequence and torque or tension method3. Use calibrated equipment where required and record the connection results4. Require independent inspection before releasing the next structural hold point | 1. Are hardware type, grade, dimensions, condition and reuse criteria verified?2. Is the required torque or tension equipment within calibration?3. Are all bolts, pins, nuts, washers and retainers completely installed?4. Has an independent competent checker accepted the connections? | ||||
| 8. Release | 1. Crane operation with incomplete connections or temporary restraints still installed2. Tools, loose components or materials falling during subsequent operation3. Incorrect limit devices, indicators or safety settings after the height change4. Crane use before required inspection, testing or commissioning is complete | 1. Relying on verbal confirmation without documented acceptance2. Removing the exclusion zone before the crane is structurally complete3. Failing to update height, tie, mast-section or configuration records4. Returning the crane to production service with unresolved defects | 1. Complete a systematic tool, component and personnel accountability check2. Restore guards, access systems, restraints, limits and operational aids3. Conduct required post-climb inspections, tests and competent-person verification4. Issue written return-to-service authorisation only after all hold points are closed | 1. Does the completed configuration match the approved climbing plan?2. Are all temporary devices and loose materials accounted for?3. Are inspection, test and commissioning records complete?4. Has formal return-to-service authorisation been issued? |
PDF A covers basic task controls; B focuses on technical failures; C covers supervision, records and handover. The article has eight stages with four items per main cell; each PDF has six key stages with three items per main cell. P/S/R/A, measurements, confirmations and signatures remain blank for actual site assessment.
Use the exact manufacturer climbing manual, approved configuration and jurisdiction-specific engineering documents. No actual model manual or site calculations were supplied. Do not infer wind limits, torque, support capacity, free-standing height or a pin-removal sequence from this guide. A support may carry hydraulic load during a prescribed stroke; mechanical transfer is required at the stages specified for that system.
4. Fictional scenario and failure mechanisms
The scenario and record comparisons are fictional teaching examples, not records of real incidents, measurements, inspections, signatures or approvals.
The original educational image is retained. It is not evidence of an actual incident or site suitability.
Important — training simulation: The following Melbourne scenario is hypothetical. The image is illustrative and must not be represented as an actual accident photograph. The scenario is not a WorkSafe Victoria investigation, prosecution, finding or incident report.
A. Hypothetical Real-World Site Scenario
On a major high-rise construction project in Melbourne, a licensed rigging crew is carrying out a telescoping operation to increase the hook height of a hammerhead tower crane from 55 metres to 70 metres.
Because the hypothetical project is located in Victoria, the applicable statutory framework would include the Occupational Health and Safety Act 2004, Occupational Health and Safety Regulations 2017, plant requirements, High Risk Work Licence requirements and relevant WorkSafe Victoria guidance. Model WHS legislation would not itself be the governing Victorian law.
While the second additional mast section is being prepared for insertion, unexpected coastal gusts reach 44 km/h. The figure is not presented as a universal statutory limit. In this scenario, it exceeds the lower climbing limit specified by the manufacturer and recorded in the approved climbing procedure. Under programme pressure, the operation is allowed to continue.
The crew releases the required upper mast connections and extends the hydraulic climbing ram through its initial stroke. A balance load has been applied, but the trolley has not been positioned at the exact balance radius specified by the manufacturer.
The crane's specified positive slew-restraint device has also not been engaged. The upper crane is restrained only by its normal friction brake, even though the climbing procedure requires an additional positive restraint for this configuration.
A sudden gust acts on the main jib and rotates the upper crane away from the prescribed climbing orientation. The rotation produces torsion and eccentric bending across the climbing frame.
The lateral reaction overloads the windward guide-roller assembly. The roller axle fails, the climbing frame racks diagonally and one mechanical climbing support loses full bearing on its mast support point.
The displaced upper structure dynamically transfers load onto the extended hydraulic cylinder. The cylinder is exposed to lateral bending for which it was not intended and buckles. The climbing frame then travels down the mast while structural components and tools fall into the work area below.
Multiple workers in the climbing frame and people within the uncontrolled ground-level exposure area suffer fatal or serious injuries.
A post-event engineering review of this hypothetical scenario would focus on:
- continuation above the manufacturer-defined wind limit;
- failure to achieve verified moment equilibrium;
- failure to apply the specified slew-restraint arrangement;
- incomplete mechanical support engagement;
- loss of guide-roller alignment;
- absence of effective stop-work intervention; and
- inadequate control of the exclusion and dropped-object zones.
B. Structural Mechanics, Dynamic Effects and Safety Engineering Principles
Upper-Crane Equilibrium and Centre-of-Gravity Alignment: During climbing, the permanent mast connection is temporarily interrupted and the climbing system carries the upper-crane reactions. The combined centre of gravity of the jib, counter-jib, counterweights, machinery deck, cab and applied balance load must remain within the limits defined by the manufacturer. Incorrect trolley position produces eccentric loading, guide reactions and frame distortion.
Hydraulic Cylinder Buckling and Side Loading: A long-stroke climbing cylinder behaves as a slender compression member. Its resistance to buckling reduces as the unsupported length increases. The cylinder must not be exposed to unapproved lateral loading caused by mast binding, frame racking or moment imbalance.
Mechanical Load Transfer: Hydraulic pressure must not be assumed to provide permanent support. At the specified stages, the load must be transferred to the crane-specific dogs, pawls, shoes, stools, pins, wedges or other mechanical supports. Every required support must achieve full bearing before the hydraulic load path changes.
Guide-Roller Reactions: Guide rollers control the relative alignment of the climbing frame and mast. Excessive clearance, seized rollers, incorrect adjustment or eccentric loading can concentrate reaction forces, damage mast chords and initiate racking.
Aerodynamic Torsion: The jib and counter-jib present large wind-exposed areas and lever arms. During climbing, the temporarily incomplete structural configuration may have less resistance to torsion than the fully connected crane. Slew restraint must therefore follow the exact manufacturer procedure.
Dynamic Load Amplification: Sudden support loss, slipping or impact can generate forces substantially higher than the static load. Safety controls must prevent movement rather than relying on workers to correct a displaced system after load transfer begins.
C. Barrier-Failure Analysis
| Failed Barrier | Failure Mechanism | Required Prevention |
|---|---|---|
| Climbing procedure | Generic instructions did not control the actual crane configuration. | Use the current manufacturer procedure and engineered site-specific climbing plan. |
| Wind control | Work continued after the recorded manufacturer limit was exceeded. | Define measurement basis, warning level, stop point, securing method and restart approval. |
| Moment balance | Trolley position was estimated rather than measured. | Physically measure and independently verify trolley radius and balance configuration. |
| Slew restraint | Normal brake used instead of the restraint required by the climbing procedure. | Install and verify the model-specific approved restraint before releasing connections. |
| Support engagement | Mechanical support did not obtain complete bearing. | Treat every load transfer as a signed permit hold point. |
| Stop-work authority | Programme pressure overrode abnormal-condition warnings. | Give every exposed worker authority to call an immediate stop and require formal reauthorisation. |
| Exclusion zone | People and temporary works remained within the credible impact area. | Base the barricaded boundary on the actual drop, swing and collapse envelopes. |
5. Conditional decisions and common errors
| Condition | Action | Evidence | Proceed when |
|---|---|---|---|
| Before opening | Balance, restraint and temporary support not confirmed | Keep connections intact; resolve missing evidence | All three verified |
| Every stroke | A support is only partly seated | Stop; use the model contingency | All required seats confirmed |
| Section transfer | Section aligned but not positively retained | Keep approved handling support in place | Restraint accepted |
| Interrupted climb | Weather recovers but defect remains | Keep work suspended; inspect the affected state | Cause and hold points closed |
| Return to service | Bolts complete but tests pending | Retain operational prohibition | Required inspections accepted |
Similar situations, different decisions
| Comparison | Situation A | Situation B |
|---|---|---|
| Balance | A level reading alone | Model method, load/radius, orientation and checker recorded |
| Support | Pressure appears steady | Each specified bearing and retainer checked at the named stroke |
| Connection | Paint mark present | Hardware, method, tool and acceptance result traceable |
| Handover | Crew says complete | Final configuration, tests, defects and release authority recorded |
Use the exact manufacturer climbing manual, approved configuration and jurisdiction-specific engineering documents. No actual model manual or site calculations were supplied. Do not infer wind limits, torque, support capacity, free-standing height or a pin-removal sequence from this guide. A support may carry hydraulic load during a prescribed stroke; mechanical transfer is required at the stages specified for that system.
B. Engineering and Structural Controls
- Manufacturer procedure: Use the current climbing procedure for the exact crane model, mast type, climbing frame, hydraulic system and configuration.
- Climbing plan: Document every temporary configuration, load path, balance position, connection release, hydraulic stroke and securing stage.
- Structural verification: Obtain competent engineering acceptance for the crane base, foundation, ties, collars, anchorages, host structure and temporary climbing conditions.
- Slew restraint: Apply the brake, pin, bar or other device prescribed for the crane. A mechanical slew-lock pin must not be described as universal when the crane uses another approved arrangement.
- Moment balance: Set the trolley and balance load to the manufacturer-defined position. Use the specified indicators and acceptance tolerances.
- Mechanical supports: Verify the actual dogs, pawls, shoes, stools, pins, wedges or proprietary supports at every transfer stage.
- Hydraulic protection: Inspect check valves, pressure-limiting devices, cylinders, rods, hoses, fittings and controls. Do not bypass safety devices.
- Connection control: Use fasteners and pins accepted by the manufacturer or engineered specification. Apply the specified tightening, tensioning, lubrication and reuse criteria.
C. Wind and Environmental Controls
Australian WHS legislation and AS 2550.4:2025 should not be represented as prescribing one universal 35 km/h climbing limit for every tower crane.
The permit must record:
- the manufacturer-defined climbing wind limit;
- whether it applies to mean wind, sustained wind, gusts or another measurement;
- the required measurement location and height;
- the instrument and communication method;
- a warning level below the stop point;
- the stop-work limit;
- lightning, visibility, rain, heat and electrical-storm restrictions;
- the procedure for securing the crane mid-climb; and
- inspection and approval requirements before restarting.
Use the lowest applicable safe limit where manufacturer, engineered, regulator or site requirements differ. Resolve contradictory technical requirements before starting work.
E. Exclusion Zones and Falling-Object Prevention
Australian legislation does not establish a universal 12-metre radius suitable for all tower crane climbing work.
Determine the boundary from:
- crane and climbing-frame footprint;
- mast-section lifting and transfer path;
- jib and counter-jib movement;
- suspended-load drift;
- falling tools, bolts and components;
- assisting-crane configuration;
- adjacent buildings, roads and public areas; and
- the credible structural-collapse envelope.
Use rigid barricades where practicable, warning signs, controlled entry points and a trained access-control person. Suspend work if the zone cannot be maintained.
F. Work at Height, PPE and Rescue
- Prioritise protected platforms, guardrails, gates and safe access systems.
- Use fall restraint or fall-arrest systems appropriate to the work position and fall-clearance conditions.
- Select harnesses, connectors, lanyards, self-retracting lifelines and anchorages under the applicable Australian Standards and competent-person design.
- Do not apply a universal anchorage rating without confirming the system design, number of users and relevant standard.
- Secure tools and small components using rated tethers, closed bolt bags or engineered retention systems.
- Use compliant safety helmets with secured chinstraps where the risk assessment requires them.
- Maintain a site-specific elevated rescue plan, equipment and trained rescue personnel.
- Do not rely solely on emergency services for the initial recovery of a suspended worker.
Technical failure review
| Job stage | Hazards and effects | Failure factors | Technical and procedural controls | Site verification |
|---|---|---|---|---|
| Plan | 1. Wrong model2. Tie failure3. Crew conflict | 1. Wrong revision2. Unchecked support3. Unassigned command | 1. Match crane and frame2. Approve temporary states3. Assign one director | 1. Manual revision2. Tie design3. Crew authority |
| Weather | 1. Wind torsion2. Falling objects3. Collision | 1. Ground-only reading2. Open boundary3. No securing plan | 1. Set model wind limits2. Control full exposure zone3. Plan safe interruption | 1. Wind basis2. Boundary map3. Securing method |
| Inspect | 1. Hydraulic drift2. Guide failure3. Falls | 1. Leaking circuit2. Worn support3. Unsafe platform | 1. Inspect valves and hoses2. Check guides and supports3. Verify access and rescue | 1. Test record2. Support condition3. Rescue readiness |
| Balance | 1. Eccentric moment2. Unwanted slew3. Support overload | 1. Wrong radius2. Wrong ballast3. Premature release | 1. Set prescribed balance2. Verify slew restraint3. Hold before opening mast | 1. Load and radius2. Restraint state3. Temporary load path |
| Each stroke | 1. Support slip2. Ram side load3. Crushing | 1. Partial seating2. Conflicting signals3. Ignored binding | 1. Follow model sequence2. Check every load transfer3. Stop on abnormal motion | 1. All support seats2. Stroke and pressure3. People clear |
| Insert | 1. Dropped section2. Transfer runaway3. Trapped hands | 1. Wrong section2. Missing end stop3. Forced alignment | 1. Match section and rigging2. Secure before detaching3. Use approved alignment | 1. Section identity2. Stops and retainers3. Temporary restraint |
| Connect | 1. Mast separation2. Fastener damage3. Dropped tools | 1. Wrong hardware2. Uncontrolled tightening3. Matchmarks only | 1. Apply specified method2. Check every connection3. Hold before load change | 1. Part and reuse rule2. Tool and results3. Independent check |
| Release | 1. Premature use2. Loose components3. Limit failure | 1. Open defects2. Old configuration3. Verbal handover | 1. Restore operating state2. Complete required tests3. Authorise return to use | 1. Final configuration2. Defect closure3. Release record |
6. Roles and responsibilities
| Role / Function | Minimum Duties and Verification Responsibilities |
|---|---|
| PCBU / Employer | Provide safe plant and systems of work; verify competent personnel, resources, consultation, licensing, inspection and emergency arrangements. |
| Principal Contractor / Project Manager | Coordinate site interfaces; ensure the SWMS is available and implemented; control access, simultaneous operations, public exposure and permit arrangements. |
| Crane Owner / Supplier | Supply the correct crane information, inspection history, maintenance records, climbing equipment and manufacturer procedures. |
| Climbing Supervisor / Competent Person | Direct the approved climbing sequence, control hold points, verify balance and support engagement, and stop work when requirements are not met. |
| Tower Crane Operator — CT HRWL | Operate within the approved procedure, set the required trolley position, monitor instruments and stop for unsafe conditions or communication loss. |
| Dogger / Rigger | Perform only work authorised by the relevant HRW licence; inspect lifting gear, control mast-section movements and verify rigging or connection tasks. |
| Structural / Temporary-Works Engineer | Assess foundations, ties, anchorages, supporting structures, reactions and temporary configurations within professional competence. |
| Independent Connection Checker | Verify mast fasteners, pins, retainers and acceptance records before structural load-path release. |
| Access-Control Person | Maintain barricades and prevent unauthorised entry into the exclusion zone. |
| Rescue Team | Maintain trained personnel, communications, access and equipment for prompt recovery from the tower or climbing frame. |
| Workers and HSRs | Participate in consultation, follow the SWMS, report hazards and exercise stop-work action where an immediate risk is identified. |
One person may perform more than one function only when that person holds the required licence, competence, authority and capacity for every assigned responsibility.
Supervision, records, handover
| Job stage | Technical and procedural controls | Site verification |
|---|---|---|
| Work package | 1. Index the approved documents2. Name competent roles3. Brief rescue and stop rules | 1. Manual revision2. Tie design3. Crew authority |
| External controls | 1. Assign wind and access watch2. Record current conditions3. Confirm one radio channel | 1. Wind basis2. Boundary map3. Securing method |
| Witness inspection | 1. Witness critical inspections2. Quarantine rejected parts3. Close defects before release | 1. Test record2. Support condition3. Rescue readiness |
| Balance release | 1. Witness balance and restraint2. Record independent check3. Control connection release | 1. Load and radius2. Restraint state3. Temporary load path |
| Stroke command | 1. Log every stroke and support2. Confirm commands received3. Suspend on any uncertainty | 1. All support seats2. Stroke and pressure3. People clear |
| Final acceptance | 1. Separate installer and checker2. Accept tests and defect closure3. Record operating release | 1. Final configuration2. Defect closure3. Release record |
7. Hold points and record comparison
| Hold point | Evidence before release | Confirmation / approval |
|---|---|---|
| Start | Use the exact manufacturer climbing manual, approved configuration and jurisdiction-specific engineering documents. No actual model manual or site calculations were supplied. Do not infer wind limits, torque, support capacity, free-standing height or a pin-removal sequence from this guide. A support may carry hydraulic load during a prescribed stroke; mechanical transfer is required at the stages specified for that system. | |
| HP-1 Balance | Is the trolley position physically measured and independently checked?; Does the slew-restraint arrangement match the manufacturer procedure?; Are counterweight, ballast and balance-load configurations correct?; Are level, plumb and climbing-frame clearances within specified tolerances? | |
| HP-2 Each stroke | Are all mechanical supports fully seated and retained as specified?; Are hydraulic pressure, cylinder position and guide alignment normal?; Are personnel clear of the potential movement, crush and shear zones?; Has the designated checker released the hold point for this stroke? | |
| HP-3 Connect | Are hardware type, grade, dimensions, condition and reuse criteria verified?; Is the required torque or tension equipment within calibration?; Are all bolts, pins, nuts, washers and retainers completely installed?; Has an independent competent checker accepted the connections? | |
| HP-4 Release | Does the completed configuration match the approved climbing plan?; Are all temporary devices and loose materials accounted for?; Are inspection, test and commissioning records complete?; Has formal return-to-service authorisation been issued? |
Complete after actual checks. Recheck after changes, defects or shift handover.
Record comparison examples
The boxes are static record prompts, not interactive or saved approvals. A tick does not establish suitability or permission to restart. Record the evidence, person, time and unresolved issues; retain the change history.
| Record type | Insufficient record | Record checklist |
|---|---|---|
| Weather | Verbal or undated confirmation only | □ Wind basis□ Boundary map□ Securing method□ Manual section, time and checker |
| Balance | Verbal or undated confirmation only | □ Load and radius□ Restraint state□ Temporary load path□ Manual section, time and checker |
| Each stroke | Verbal or undated confirmation only | □ All support seats□ Stroke and pressure□ People clear□ Manual section, time and checker |
| Connect | Verbal or undated confirmation only | □ Part and reuse rule□ Tool and results□ Independent check□ Manual section, time and checker |
8. Site checklist and emergency response
| Check item | Result | Person / action |
|---|---|---|
| □ Plan: Manual revision | ||
| □ Weather: Wind basis | ||
| □ Inspect: Test record | ||
| □ Balance: Is the trolley position physically measured and independently checked? | ||
| □ Each stroke: Are all mechanical supports fully seated and retained as specified? | ||
| □ Insert: Does the mast-section identification match the approved crane configuration? | ||
| □ Connect: Are hardware type, grade, dimensions, condition and reuse criteria verified? | ||
| □ Release: Does the completed configuration match the approved climbing plan? | ||
| □ Release / handover authority |
Stop work
Stop for missing support confirmation, abnormal pressure or movement, guide binding, loss of communication, weather outside the approved envelope, an incomplete connection or entry into the exposure zone. Stop progressing the sequence; keep the system in its prescribed holding condition.
Emergency response
Do not automatically depressurise, reverse the ram, lower onto the nearest support or release a slew restraint. These actions can remove the current load path. Apply the manufacturer contingency for the actual stage, secure the area and obtain the responsible technical direction. Rescue must not depend on moving an unstable crane. Restart requires cause identification, correction, reinspection and repeat release of the affected hold points.
9. Sources and review limits
2026-10-08
Australia: model WHS material requires local adoption checks; Victoria has a separate OHS framework. NSW guidance is a state reference. AS 2550.4:2025 remains in the preserved title, but its licensed text was not reviewed. Confirm jurisdiction, applicable licence classes and SWMS duties for the actual work.
| Source | Scope and limitations |
|---|---|
| Safe Work Australia - Tower cranes model Code | Official model-code page; check implementation with the local regulator. Not a national workplace approval. |
| SafeWork NSW - Erecting, climbing and dismantling | Planning, competent supervision, component handling and manufacturer instructions; jurisdiction-specific guidance. |
Use the exact manufacturer climbing manual, approved configuration and jurisdiction-specific engineering documents. No actual model manual or site calculations were supplied. Do not infer wind limits, torque, support capacity, free-standing height or a pin-removal sequence from this guide. A support may carry hydraulic load during a prescribed stroke; mechanical transfer is required at the stages specified for that system.
10. PDF guidance and FAQ
PDF A covers basic task controls; B focuses on technical failures; C covers supervision, records and handover. The article has eight stages with four items per main cell; each PDF has six key stages with three items per main cell. P/S/R/A, measurements, confirmations and signatures remain blank for actual site assessment.
jsa-crane-telescoping
Does steady pressure prove safe support?
No. Identify the current load path and verify all supports and retainers required by the model before the next transfer. Pressure alone cannot confirm seating.
Can climbing resume as soon as wind drops?
No. Check the securing state, forecast, defects and changed configuration; repeat affected hold points before authorised restart.
Does a paint mark prove bolt preload?
No. Use the specified installation and verification method with traceable tooling and recorded results. Matchmarks are supplementary.
Are A/B/C separate operating procedures?
No. A summarises field controls, B examines mechanical failures, and C organises supervision and evidence. Read them with the full eight-stage body and actual manufacturer procedure.
Has a professional verified or approved this document?
No. Public sources and editorial, layout and consistency checks were reviewed using AI. No site inspection or professional technical approval has been performed. Obtain appropriate professional review before use.
11. Revision history and authorship
This is reference content written and revised with AI. It has not been verified or approved by a professional. Review by a suitably qualified professional and site authorisation are required before use.
Original body and three A/B/C downloads retained in recovery records; no numeric revision identified in their text or metadata. A/B/C describe perspectives, not chronological revisions. This dated revision is v1.1; it is an editorial revision without professional technical approval.
| Date | Version | Change | Review status |
|---|---|---|---|
| 2026-09-16 | A/B/C | Original preserved | No professional approval |
| 2026-10-08 | v1.1 | Decisions, records, JSA and PDFs revised | No professional approval |
Preserved the useful original controls and training scenario. Consolidated the original stages into eight without treating a grouped row as a machine operating sequence. Added explicit interruption/restart decisions, record comparisons and model-specific load-path limits. Original source links remain traceable in the recovery record; only the current review scope listed here is claimed.