Crane has been widely used in the production of oil field material handling and transportation, well site relocation, production capacity construction, etc. due to its advanced technical performance, flexible and fast mobility, strong adaptability and other characteristics. What are the causes of crane rollover accidents? below Huai'an Crane Rental Company Let me introduce you!

1. Overload

The lifting capacity of self-propelled jib cranes changes with the tilt angle of the boom. The Crane Safety Management Regulations points out that "the lifting capacity and the tilt angle of the boom shall meet the design requirements", and stipulates that "the lifting machinery shall not be overloaded." In actual work, due to the unclear estimation of the weight of the lifted objects, or insufficient attention to safety, overload operation is prohibited, Make the crane lose stability and cause "rollover".

2. Outrigger

The root cause of such accidents as rollover not occurring on a horizontal plane is that the outriggers touch the ground with different hardness and softness, resulting in uneven sagging of the outriggers.

The main measures to prevent sagging of outriggers are as follows:

The outrigger must be supported on a flat and solid ground, generally using a backing plate.

The outrigger cannot be supported near the excavation foundation to prevent landslide.

The outriggers shall not be supported on various buried objects (underground pipes, entrances and exits of underground works) to prevent collapse.

3. Rotating too fast

At the beginning of lifting objects, cranes generally do not roll over, which often occurs in the process of rotation. Because the rotation will produce centrifugal force, the faster the rotation, the greater the centrifugal force. At the same time, because of turning to the downwind and other directions that are not conducive to stability, these factors combined to cause this rollover accident. In this way, it should be noted that the slewing speed should not be too fast.

4. Luffing and telescopic boom operation program error

When lifting a full load, only retract the boom (from large to small, from long to short), and do not extend or drop the boom, otherwise the car will roll over.

The wrong telescopic boom of hydraulic crane will also cause rollover.

5. Danger angle

There is a dangerous angle for some cranes. When the boom is very long, even if no objects are lifted, the weight of the boom itself will cause rollover.

6. The turning speed is too high

Since the center of gravity of automobiles and rubber tyred cranes is higher than that of ordinary automobiles, if the turning speed is too high, overturning will also occur.

7. Disconnection of connecting bolts of rotary table

Continuous bolts must be safe and reliable to meet the strength requirements.

These are the common reasons for crane rollover. Understanding these knowledge will help crane drivers ensure safe driving. If you want to know more about construction machinery leasing, please pay attention to Huai'an Crane Rental Official website!