Gantry cranes are often used to carry heavy objects and deal with accident vehicles in daily life. Gantry crane is a heavyweight equipment. Gantry crane refers to a multi-function gantry crane that vertically lifts and horizontally carries heavy objects within a certain range. Some working characteristics of lifting equipment are intermittent motion, that is, the corresponding feeding, transportation, unloading and other mechanisms work alternately in the working cycle, and the development and application of portal cranes in the market are more and more extensive. Gantry crane itself will have some accidents, and then introduce the causes and preventive measures of gantry crane accidents.

1. Subjective cause of the accident.

(1) The driver is inexperienced and paralyzed. After the gantry crane is installed, it is impossible to carefully check and evaluate the weight of the crane by blind lifting.

(2) The driver violated the regulations and did not strictly abide by the strict regulations on the technical parameters of gantry crane hoisting, resulting in the length of the auxiliary arm being too long and the amplitude of the boom being too large, resulting in an accident.

(3) The management of the vehicle management department is lacking, and there is no designated person to conduct on-site command during the hoisting operation.

2. The objective cause of the accident.

(1) Gantry crane has no torque limiter device, so it can't provide accurate technical parameters for drivers and avoid such accidents.

(2) The construction party failed to provide the driver with detailed information about the hoisting materials. When hoisting, the connecting arm is still lying in the closed carriage, so the driver can't observe and estimate the weight in detail before hoisting the carriage.

3. Preventive measures.

(1) Strengthen the education of drivers' operating procedures to make them master relevant technologies.

(2) Strictly abide by the requirements of the Regulations on Supervision of Special Equipment and other laws and regulations. Drivers must hold relevant certificates and regularly inspect and supervise vehicles.

(3) For the operation project on special site, the hoisting unit shall conduct detailed investigation and demonstration, formulate detailed operation plan, and arrange full-time personnel to conduct on-site command.

(4) Install a torque limiter on the vehicle to fundamentally eliminate the irregular hidden danger caused by overload.

(5) When choosing the hoisting site, you must choose an open site that is flat, hard, without looseness, collapse and manhole cover.

(6) Keep the crane in a complete technical state, especially regularly check the main arm, outrigger oil cylinder, support pad, luffing oil cylinder and other components for cracks and oil leakage.

(7) Before lifting, the driver must estimate the weight of each object, and it is forbidden to lift blindly.