A tower crane dismantling method statement is the final safety-critical document on a construction project. It transforms a high-risk, complex operation into a controlled sequence of verifiable steps. Never rush this process. The crane that took three days to erect may only take eight hours to dismantle, but those eight hours demand greater vigilance.
Before any pin is pulled or sling attached, ensure:
When in doubt, stop. Re-evaluate. Then proceed.
Disclaimer: This article is a generic template for informational purposes. Always consult the specific crane manufacturer’s manual and employ a qualified Appointed Person to prepare a site-specific method statement. Regulations vary by jurisdiction.
Understanding the Tower Crane Dismantling Method Statement Dismantling a tower crane is a complex engineering operation that requires meticulous planning and coordination. Unlike the initial assembly, dismantling often takes place once a project is nearing completion, which means the crane may be surrounded by finished structures, active utilities, or public infrastructure.
A Tower Crane Dismantling Method Statement (TCDMS) is a vital safety and technical document. It serves as a comprehensive plan to ensure the crane is decommissioned safely, protecting both the workers and the surrounding environment. Below is an overview of the essential components found in a professional method statement. 1. Project Scope and Specifications
Every dismantling operation begins with a clear definition of the equipment and the environment. This section typically includes:
Crane Data: Specifics regarding the make, model, jib configuration, and total height of the crane.
Site Layout: A detailed map showing the crane's position relative to the building, power lines, and public access areas.
Roles and Responsibilities: Identification of the qualified personnel involved, such as the Appointed Person, the lift supervisor, and the specialized dismantling technicians. 2. Planning and Regulatory Compliance
Before work commences, several logistical and safety hurdles must be addressed:
Site Inspections: Assessing the ground stability for the "assist crane" (the mobile crane used to lower the tower crane components).
Exclusion Zones: Defining and securing the area where components will be lowered to prevent unauthorized access.
Environmental Factors: Establishing strict limits for wind speeds and visibility. Operations are generally postponed if weather conditions exceed manufacturer-specified safety thresholds.
Permits: Obtaining necessary approvals, such as local road closure permits or aviation authority notifications. 3. Equipment and Resource Allocation
The method statement lists all tools and machinery required for the task. This ensures that everything on-site is inspected and fit for purpose:
The Assist Crane: A mobile or crawler crane with sufficient capacity and reach for the specific loads.
Lifting Accessories: Certified chains, slings, and shackles that are rated for the weights of the crane components.
Safety Gear: Fall arrest systems, specialized access platforms, and communication equipment (radios). 4. The General Dismantling Sequence tower crane dismantling method statement
While specific sequences vary by manufacturer and crane type, a standard method statement outlines a logical progression, often involving these phases: Phase A: Securing the Structure
The crane is positioned according to the manufacturer’s "out of service" instructions to ensure it is balanced for the initial lifts. Phase B: Removal of Counterweights
To maintain the structural integrity and balance of the mast, counterweight blocks are removed in a specific order. Phase C: Jib and Counter-Jib Decommissioning
The assist crane supports the weight of the jib as it is disconnected from the slewing unit. Once the main jib is safely on the ground, the counter-jib and the A-frame (or cat-head) are removed. Phase D: The Slewing Unit and Mast
The upper works, including the operator's cab and the slewing ring—often the heaviest single components—are lowered. Finally, the mast sections are unbolted and removed one by one. 5. Risk Mitigation and Safety Protocols
The core of the method statement is dedicated to identifying and managing hazards:
Fall Prevention: Detailed protocols for technicians working at significant heights.
Load Management: Ensuring no component is lifted without a confirmed weight and a verified rigging plan.
Communication: Establishing clear signaling protocols (using hand signals or dedicated radio channels) between the ground crew and crane operators. 6. Emergency and Contingency Planning
A professional plan must account for the unexpected. This includes:
Recovery Procedures: Plans for safe egress or rescue in the event of a mechanical failure or medical emergency at height.
Spill Containment: Protocols for managing hydraulic fluids or other environmental hazards. Conclusion
A Tower Crane Dismantling Method Statement is an indispensable tool for site safety. It must be authored by competent professionals and strictly adhere to the crane manufacturer’s technical manuals. By documenting every step and prioritizing risk management, construction teams can ensure that the final phase of a crane’s lifecycle on-site is completed successfully and safely.
You should adapt the site-specific details (crane model, load capacities, access constraints, weather limits, etc.) before use.
Any method statement must address these top hazards explicitly:
| Hazard | Control | |--------|---------| | Falling from height | Full body harness, double lanyard, and static line at all above 2m. Guardrails on temporary platforms. | | Crane collapse | Never exceed mobile crane’s load chart. Use load indicators. Do not dismantle out of sequence. | | Crushing between sections | “No hands in pinch points” rule. Use taglines and push-pull sticks. | | Electrocution | Survey for power lines before starting. Maintain minimum approach distances (10 ft for 50kV, more for higher). | | Sudden wind gust | Anemometer with audible alarm at 20 mph. Pre-planned tie-down for partially dismantled jib. | | Dropped objects | Tool lanyards, toe-boards on work platforms, exclusion zone below. |
✅ Method statement signed by AP
✅ Ground conditions verified
✅ Weather window confirmed
✅ All rigging gear certified
✅ Exclusion zone guarded
✅ Radios tested
✅ Emergency rescue plan briefed A tower crane dismantling method statement is the
Dismantling a tower crane is a high-stakes operation, but with a rigorous method statement, it becomes a controlled, predictable process. Never rush it. The crane got you to the top—now get it down safely.
Have a specific crane model or site constraint? Drop a comment below or consult a CPCS/NCCCO certified lifting engineer.
A Tower Crane Dismantling Method Statement is a critical safety document that outlines the step-by-step procedure for removing a crane from a construction site.
Below is a standard framework for this document. Note: This must be tailored to the specific crane model, site constraints, and local safety regulations by a qualified engineer. 1. Project Overview & Scope Project Name/Location: [Insert Details]
Crane Specifications: Make, model, jib length, and current height under hook.
Objective: To safely decommission and remove the tower crane using a mobile assist crane. 2. Personnel & Responsibilities
Appointed Person (AP): Responsible for the lift plan and overall management. Crane Supervisor: Oversees the dismantling team on-site.
Slinger/Signallers: Responsible for attaching loads and directing the assist crane.
Crane Technicians/Erectors: Skilled team performing the mechanical disassembly. 3. Equipment & Tools
Assist Crane: [Insert Capacity, e.g., 200-ton Mobile Crane] with sufficient boom length.
Hand Tools: Torque wrenches, impact drivers, drift pins, and sledgehammers.
Safety Gear: Full-body harnesses, fall arrest lanyards, radios, and standard PPE (Hard hats, boots, hi-vis). 4. Pre-Dismantling Requirements
Exclusion Zone: Establish a physical barrier around the radius of the crane and the loading area to prevent unauthorized access.
Weather Check: Confirm wind speeds are below the manufacturer’s limit for dismantling (typically <10 m/s).
Ground Conditions: Verify the mobile crane standing area is compacted and capable of bearing the outrigger loads. 5. Step-by-Step Dismantling Procedure Phase A: Preparation
Position the mobile assist crane and set outriggers on spreader mats.
Trolley the tower crane to the minimum radius and engage the slew lock.
Disconnect the main power supply and switch to the assist crane’s auxiliary power if required. Phase B: Counterweights & Jib When in doubt, stop
Counter-Jib Weights: Remove the specified number of counterweight blocks as per the manufacturer's manual to maintain balance.
The Jib: Attach the assist crane to the jib at designated lifting points. Remove pins and lower the jib to the ground for further disassembly.
The Counter-Jib: Remove the remaining counterweights, then rig and lower the counter-jib. Phase C: Tower Head & Cab
Rig the tower head/apex and disconnect it from the slewing ring. Lower to the transport vehicle. Disconnect and lower the operator’s cabin. Phase D: Slewing Assembly & Tower Sections Unbolt the slewing ring/gear assembly and lower it.
Systematically unbolt and remove tower sections (masts) one by one. If a climbing frame was used, dismantle and lower it last. 6. Safety & Environmental Controls
Fall Protection: 100% tie-off policy for all technicians working at height.
Communication: Dedicated radio channel for the lead signaller and mobile crane operator.
Waste Management: Ensure no hydraulic fluids leak during hose disconnection; use drip trays where necessary. 7. Emergency Procedures
Contact details for the nearest hospital and site first aid station. Rescue plan for a technician stranded at height.
Tower Crane Dismantling Method Statement is a critical document detailing the step-by-step procedures to safely disassemble and remove a tower crane from a site. Since the completed structure often occupies most of the available space, dismantling is frequently more complex than erection. 1. Key Components of the Method Statement
A professional method statement should include the following sections to ensure compliance and safety: Scope of Work
: Specific crane details (e.g., Liebherr 154ECH), site address, and planned dates. Personnel & Responsibilities
: Defined roles for Erection Engineers, Foremen, Riggers, and Electricians. Equipment List
: Details of the auxiliary mobile crane, lifting gears, and specialized tools. Risk Assessment
: Identification of hazards such as falls from height, falling objects, and mechanical failure. Communication Plan
: Use of radio services for coordination between operators, supervisors, and riggers. SafeWork NSW 2. Pre-Dismantling Preparation
Before any components are removed, the following must be verified: Tower Crane Dismantling Method Statement | PDF - Scribd
The last piece to come down is the base mast section and the foundation anchor bolts. In many modern methods, the foundation is left in place (buried in the concrete slab) to avoid compromising the building’s waterproofing. The method statement must specify this: abandon in situ or remove and grout.
Once the last truck leaves, the statement’s final step is a post-dismantle safety audit:
| Hazard | Control | |--------|---------| | Crane collapse during dismantling | Follow manufacturer sequence; never unbolt structural pins before load taken by assist crane; maintain correct mast tie removal order. | | Falling components | Use taglines; no shock loading; keep personnel clear of suspended loads. | | Working at height | Full harness with double lanyard, anchored to independent fall arrest point (not the crane component being removed). | | Mobile crane overturn | Level ground; outriggers fully extended with pads; load monitor; certified lift plan. | | Struck by counterweights | Rig lifting points; use spreader beams if needed; lower slowly; exclude personnel. | | Weather | Stop if wind speed exceeds safe limit; suspend for lightning or wet, slippery jib walking surfaces. |