First, the subjective causes of the accident:
(1) The driver lacked sufficient experience, which led to a mental block during the operation. After positioning the crane, they failed to carefully inspect and assess the object being lifted, including its weight and dimensions.
(2) The driver violated operating procedures and did not strictly follow the technical parameters required for safe lifting. This resulted in the jib being extended too far and the boom being overloaded, ultimately leading to the accident.
(3) The vehicle management department was not properly overseeing operations. There was no dedicated personnel on-site to provide command and supervision during the lifting process, increasing the risk of errors.
Second, the objective causes of the accident:
(1) The truck crane was not equipped with a torque limiter, which is essential for providing accurate data to the driver to prevent overloading and unsafe operations.
(2) The construction party did not supply the driver with detailed information about the load, such as its size and weight. Additionally, the connecting arm was still inside the closed compartment, preventing the driver from properly observing and estimating the weight before lifting.
Third, preventive measures should be taken to avoid future incidents:
(1) Enhance the driver's training on safe operating procedures to ensure they are fully competent and confident in their tasks.
(2) Strictly follow regulations like the "Special Equipment Safety Supervision Regulations." All drivers must hold valid certifications, and vehicles must undergo regular inspections and maintenance.
(3) For special lifting projects, the lifting company should conduct thorough site investigations, develop detailed operation plans, and assign dedicated personnel to supervise the operation on-site.
(4) Install a torque limiter on the crane to eliminate the risk of overload and improve overall safety.
(5) Choose a suitable lifting location—preferably a flat, solid, and open area that is free from soft ground, unstable structures, or hidden hazards like manholes.
(6) Regularly maintain and inspect the vehicle to ensure it remains in good working condition. Pay particular attention to key components such as the main boom, leg cylinders, support pads, and luffing cylinders for signs of damage or leakage.
(7) Before each lift, the driver must accurately estimate the weight of the load and never attempt to lift anything that exceeds the crane’s capacity. This step is crucial in preventing accidents and ensuring operational safety.
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