Crane Overturn in Stallikon Critically Injures Operator During Tower Crane Dismantling

30 Second Takeaway

A 60-year-old crane operator was seriously injured Thursday morning in Stallikon ZH, southwest of Zurich, Switzerland, after his six-axle All Terrain crane overturned rearwards during tower crane dismantling operations. The crane overturn during tower crane dismantling occurred while approximately two thirds of the crane’s eight-section main boom was extended. The force of the All Terrain crane accident ejected the operator from the superstructure cab. He was airlifted to hospital, where his condition remains serious. Authorities including Zurich Cantonal Police, the Limmattal/Albis public prosecutor’s office, and the Forensic Institute of Zurich are investigating the cause of the crane accident in Switzerland.

Incident Overview

Stallikon ZH, Southwest of Zurich, Switzerland

A six-axle All Terrain crane overturned Thursday morning during tower crane dismantling operations, resulting in a serious crane operator injury. The crane overturn in Stallikon occurred southwest of Zurich and has prompted a multi-agency investigation.

What Happened

Based on information available at the time of publication:

• A six-axle All Terrain crane was dismantling a tower crane

• Approximately two thirds of the crane’s eight-section main boom was extended

• The crane appears to have overturned rearwards during the dismantling operation

• The crane overturn occurred with significant force

• The operator, a 60-year-old man, was ejected from the superstructure cab

• Some reports indicate he may have been thrown through the cab windscreen, though this has not been officially confirmed

• The crane operator was seriously injured

• He was airlifted from the scene to hospital

• His condition remains serious

• The boom came to rest on what appears to be a mobile generator pack at the site

What Is Known

• Equipment involved: Six-axle All Terrain crane

• Incident type: Crane overturn during tower crane dismantling

• Location: Stallikon ZH, southwest of Zurich, Switzerland

• Work scope: Dismantling of a tower crane

• Injuries: One crane operator injured (serious condition)

• Damage: Crane overturned rearwards; superstructure cab severely damaged

• Investigation status: Active investigation underway by Zurich Cantonal Police, the Limmattal/Albis public prosecutor’s office, and the Forensic Institute of Zurich

Early Observations

While the exact cause of the crane overturn during tower crane dismantling has not been confirmed, early reporting suggests:

• The crane overturned while operating with a substantial portion of its main boom extended

• The force of the All Terrain crane accident appears significant based on visible structural damage

• Images from the scene suggest the carrier cab may have partially detached during the overturn

• The superstructure cab sustained severe impact damage

• Authorities have not confirmed whether windscreen failure contributed to the operator’s ejection

• Ground conditions, outrigger deployment, and load transition dynamics are expected to be central to the investigation

Investigators are currently examining whether stability factors, setup conditions, or load transfer during dismantling contributed to the crane accident in Switzerland.

Why This Incident Was Possible

Crane overturn during tower crane dismantling is a high-consequence event often associated with reduced stability margins during dynamic lifting operations.

Potential contributing factors in similar crane overturn incidents include:

• Incorrect load calculation during tower crane section removal

• Insufficient ground bearing capacity beneath outriggers

• Inadequate outrigger matting or load distribution• Unexpected load shift while separating tower crane components

• Rearward stability limitations when operating with extended boom length

• Dynamic shock loading during release of structural sections

• Improper lift sequencing or communication breakdown

• Mechanical or structural component failure

• Failure to reassess crane configuration during dismantling phases

Because tower crane dismantling operations involve changing load geometry and sudden weight transfer, stability can be compromised rapidly if engineering controls and operational discipline are not strictly maintained.

Industry Reminder

Dismantling operations require the same level of engineering precision as erection.

Extended boom configurations combined with shifting load geometry can significantly reduce stability margins in large All Terrain crane operations. Thorough lift planning, confirmed ground assessment, and continuous stability monitoring are critical to preventing another crane overturn during tower crane dismantling.

Editorial Note

Crane Hub Global reports on crane accidents, crane overturn incidents, and lifting-related events to support industry learning and prevention. This article is based on information available at the time of publication and may be updated as further details emerge from investigators and local authorities regarding this crane accident in Switzerland.

How Crane Overturns During Tower Crane Dismantling Can Be Prevented

Conduct Engineering-Level Lift Planning

Every tower crane dismantling operation should be supported by a detailed lift plan evaluating boom length, radius, counterweight configuration, and rearward stability margins.

Verify Ground Bearing Capacity

A significant number of crane overturn incidents stem from inadequate ground support. Soil assessment and proper outrigger mat sizing must be confirmed before dismantling begins.

Reassess Stability With Extended Boom Configurations

Operating with a large percentage of the main boom extended reduces tipping tolerance. Stability calculations must reflect dismantling-phase load transitions.

Control Dynamic Load Transfers

Controlled separation of tower crane components helps prevent shock loading that can trigger a crane overturn during tower crane dismantling.

Empower Stop-Work Authority

Operators and supervisors must be authorized to halt operations immediately if abnormal boom movement, unexpected load shift, or instability is observed.

Maintain Inspection and Monitoring Protocols

Routine inspection of structural components, hydraulic systems, and load moment indicators reduces the risk of mechanical contribution to a serious All Terrain crane accident.