First, the subjective cause of the accident

(1) The driver's lack of work experience and mental paralysis, after placing the crane, blindly lifting the object to be lifted without carefully viewing and evaluating its weight.

(2) The driver operates in violation of regulations and does not strictly abide by the strict regulations of the technical parameters of the truck crane, resulting in the auxiliary arm being too long and the lifting arm being too large, resulting in accidents.

(3) The vehicle management department lacks management and fails to arrange special personnel to conduct on-site command during hoisting operations.

Second, the objective cause of the accident

(1) The truck crane has no torque limiter device, so that it can not provide accurate technical parameters for the driver to avoid such accidents.

(2) If the construction party fails to provide the driver with the details of the lifting object (such as size, weight, etc.), the connecting arm is still lying in the closed compartment when hoisting, and the driver cannot observe it in detail and estimate the weight before lifting it from the compartment.

Iii. Preventive measures

(1) Strengthen the education of safe operation procedures for drivers so that they can master the relevant technologies skillfully.

(2) Strictly comply with the requirements of laws and regulations such as the Regulations on the Safety Supervision of Special Equipment, and the driver must hold a license to work, and regularly inspect and supervise the vehicle.

(3) For special site operation projects, it is necessary for the hoisting unit to carry out detailed inspection and demonstration, and formulate detailed operation plans, and arrange full-time on-site command.

(4) Install a torque limiter on the vehicle to fundamentally eliminate irregular safety hazards due to overload.

(5) When selecting the hoisting site, it is necessary to choose a flat and solid open site without soft, collapsed and sewer manhole covers.

(6) Maintain and maintain the vehicle to ensure that the vehicle is in good technical condition, especially to frequently check the main arm, leg cylinder, support pad, amplitude cylinder and other parts for cracks, oil leakage and other phenomena.

(7) Before lifting, the driver must estimate the weight of each piece of such lifting, and blind lifting is strictly prohibited.