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Tower Crane Dismantling Method Statement Direct

This report outlines the standard procedures, safety protocols, and operational steps for the safe dismantling of a top-slewing tower crane. 1. Pre-Dismantling Preparation

Before any components are moved, the following must be in place: Site Survey:

Verify the ground bearing capacity for the mobile crane (assist crane). Ensure no new underground utilities or structures have been installed since the crane was erected. Exclusion Zones:

Secure a radius around the crane to prevent unauthorized entry. This may require road closures or nighttime work. Weather Monitoring: Maximum wind speed for dismantling is typically 20 mph (9 MHz) , though manufacturer specs take precedence.

Finalize all "Lift Plans" and obtain local authority approvals for mobile crane placement. 2. Equipment Requirements Assist Crane:

A mobile or crawler crane with sufficient capacity and boom length to reach the tower crane’s highest point. Rigging Gear:

Certified slings, shackles, and spreader beams inspected within the last 6 months. tower crane dismantling method statement

Mobile Elevating Work Platforms for technician access to pins and bolts. 3. Dismantling Sequence

The process generally follows the reverse of the erection sequence: Trolley and Hook Block:

The trolley is retracted to the minimum radius and secured. The hook block is lowered and disconnected. Counterweights:

The assist crane removes the counterweight blocks one by one, leaving only the "ballast" required to maintain balance during jib removal (per manufacturer instructions). Jib Removal:

The main jib is rigged, the pins are driven out, and the assist crane lowers the jib to the ground for further disassembly. Counter-Jib:

Once the main jib is clear, the counter-jib (including the hoisting winch) is disconnected and lowered. Slew Turret and Cabin: issues the lift plan

The slewing assembly, cabin, and tower head are removed as a single or modular unit. Tower Sections:

The assist crane removes the mast sections one by one. If the crane used a climbing frame, it is typically used to lower the crane to a manageable height first. Base/Chassis:

The foundation anchors or static base are disassembled last. 4. Safety and Risk Management Fall Protection:

Technicians must remain 100% tied off using dual-lanyard systems while on the mast or jib. Communication:

A dedicated radio channel must be maintained between the assist crane operator, the tower crane technician, and the banksman. Stability:

Never remove more counterweight than specified before the jib is detached; doing so can cause a structural collapse due to the rear-heavy moment. Trapped Energy: enforces exclusion zones. |

Ensure all electrical systems are locked out/tagged out (LOTO) before disconnecting power cables. 5. Post-Dismantling Site Clearance:

Components must be loaded onto trailers immediately to prevent site congestion. Foundation Review:

If the crane was on a reusable base, inspect for damage. If on an expendable anchor, shear the bolts and grout the surface. table to accompany this sequence?

You should adapt the site-specific details (crane model, load capacities, access constraints, weather limits, etc.) before use.

15. Inspections and documentation

14. Competency and training

Part 2: Roles & Responsibilities

| Role | Name (Example) | Responsibility | |------|----------------|----------------| | Project Manager | J. Smith | Overall authority; ensures resources are available. | | Appointed Person (AP) | R. Jones | Plans the operation; issues the lift plan; holds authority to stop work. | | Crane Supervisor | T. Brown | Directs the dismantling crew; manages communication; checks weather. | | Tower Crane Operator | M. Lee | Operates the tower crane during lowering of components; shuts down crane. | | Mobile Crane Operator | D. Clark | Operates the auxiliary mobile crane (e.g., 200-tonne all-terrain). | | Riggers / Dogmen | Team of 4 | Attach slings, guide loads, disconnect pins/bolts. | | Safety Officer | S. Grey | Monitors compliance; enforces exclusion zones. |

10. Sample Method Statement Template (Abbreviated)

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 ||

3. References and standards