"With these free video subtitles downloading sites, I can enjoy my favorite American TV series better. They are worth trying." more >>
After the last component is on the ground:
For practical use, a tower crane dismantling method statement should include this table format on the first page:
| Project Name: | XYZ High-Rise | |------------------|----------------| | Crane Model: | Potain MD 560 | | Dismantling Date: | 15 Nov 2025 | | Appointed Person: | J. Smith | | Mobile Crane: | Liebherr LTM 1160 (160t) | | Weather Limit: | Wind < 20 mph, no precip | | Sequence Step | Responsible | PPE | Permit Required | | 1. Site setup | Supervisor | HV, Gloves | Exclusion zone | | 2. Jib dismantle | Rigger A | Harness, radio | Lift plan | | 3. Counter-jib | Rigger B | Harness | Lift plan | | … | … | … | … | | Emergency contact: | Site security: 555-0199 ||
Include a clear emergency response plan:
A tower crane dismantling method statement is not merely paperwork – it is a life-saving operational blueprint. Every bolt removed represents a high-risk engineering challenge. By following the systematic, step-by-step approach outlined above – including rigorous pre-planning, clear roles, weather monitoring, and emergency contingencies – project managers and dismantling crews can complete the job safely, efficiently, and in compliance with regulatory standards. Always remember: if the method statement does not adequately address a specific site condition, stop work and revise the document before proceeding.
Final note: This article is a general guide. Always consult your crane manufacturer’s specific manual, local legal requirements (OSHA 1926.1400, BS 7121, etc.), and a qualified appointed person before any dismantling operation.
Method Statement: Tower Crane Dismantling The dismantling of a tower crane is one of the most high-risk phases of a construction project. Unlike installation, where the site is often clear, dismantling usually occurs when the building is nearly finished, leaving limited space and tighter logistics.
This method statement outlines the systematic approach to safely decommissioning a tower crane. 1. Project Overview & Scope
The objective is to dismantle the tower crane using a mobile crane or a derrick crane, ensuring the safety of personnel, the structural integrity of the building, and the protection of the public. 2. Pre-Dismantling Requirements Before any work begins, the following must be in place:
Permits: Valid local authority permits for road closures or sidewalk diversions. tower crane dismantling method statement
Weather Monitoring: Dismantling must be suspended if wind speeds exceed the manufacturer’s limits (typically 38–45 mph).
Exclusion Zone: A physical barrier at ground level to prevent unauthorized entry into the "drop zone."
Equipment Inspection: All lifting gear (slings, shackles, chains) must have valid test certificates. 3. Personnel & Responsibilities
Appointed Person (AP): Responsible for the lift plan and overall safety. Crane Supervisor: Manages the dismantling team on-site.
Lead Rigger: Ensures all components are balanced and secured before disconnecting.
Slinger/Signaller: Communicates with the mobile crane operator via radio. 4. Equipment List
Assist Crane: A mobile crane with sufficient capacity and reach (e.g., a 250-ton or 500-ton crane). Hand Tools: Impact wrenches, drift pins, and sledgehammers.
Personal Protective Equipment (PPE): Safety harnesses (with double lanyards), hard hats, hi-vis vests, and steel-toed boots. 5. Step-by-Step Dismantling Procedure Phase 1: Preparation
Jib Positioning: The crane is rotated to the pre-agreed "parked" position to allow the assist crane access. After the last component is on the ground:
Trolley & Hook: The trolley is moved to the minimum radius and locked. The hook block is lowered to the ground or secured. Phase 2: Counter-Jib Weight Removal
The assist crane takes the tension of the first counter-weight. Riggers remove the retaining pins.
The weight is lowered to the ground. This process is repeated, usually leaving one weight in place to maintain balance until the jib is removed. Phase 3: Jib Removal
The assist crane hooks onto the jib at the manufacturer-specified lifting points. Riggers disconnect the jib pins at the tower head.
The assist crane slowly lowers the jib to the designated dismantling area. Phase 4: Counter-Jib & Tower Head Removal The remaining counter-weights are removed.
The assist crane supports the counter-jib while pins are removed. The tower head (apex) is disconnected and lowered. Phase 5: Mast Section Removal
If a climbing frame is used, the crane "telescopes" down by removing mast sections one by one.
If the assist crane has enough height, it simply unbolts and lifts each mast section directly from the top.
The slewing ring and cab are typically removed as one unit before the final mast sections. Phase 6: Base & Foundation The fixing angles or foundation anchors are released. The remaining base section is removed. Secure all crane sections for transport (lashing certified)
Any ballast weights at the base are loaded onto transport trucks. 6. Safety & Environmental Controls
Communication: All team members must use a dedicated radio frequency.
Working at Height: Riggers must remain 100% tied off to approved anchor points.
Traffic Management: Marshals must guide transport trucks into and out of the site to prevent collisions. 7. Emergency Response In the event of an accident or equipment failure: Cease all lifting operations immediately. Secure the load if possible. Follow the site-specific Emergency Action Plan (EAP).
A Tower Crane Dismantling Method Statement is a critical safety and technical document outlining the step-by-step procedure for removing a tower crane from a construction site. It ensures the process is controlled, risks are managed, and all personnel follow a standardized sequence. Core Components of a Dismantling Method Statement Tower Crane Dismantling Procedure | PDF - Scribd
Once the last piece is on the ground, the method statement requires:
Before a single bolt is turned, a method statement begins with an audit. Engineers must answer three critical questions:
Key constraint: The mobile crane’s jib must reach the top of the tower crane without exceeding 75% of its rated capacity—a legal margin in most jurisdictions.
