1. Unreasonable structure of bridge erecting machine
When the cantilever bridge erecting machine is suspended, the alignment completely depends on the subgrade at the bridge head, and the axle load is great. Although the performance of other conventional bridge erecting machines is better than that of cantilever bridge erecting machines, there are still defects such as long body, self weight, heavy axle load, high center of gravity and so on. Once the protective measures are not in place, this structure is unreasonable, which will cause the bridge erecting machine to overturn.
2. Poor maintenance of bridge erecting machine
The bridge erecting machine belongs to the special mechanical equipment of the bridge, which has a variety of transmission systems and power systems, and includes a large number of steel structural parts. Combined with the open-air working environment and more working procedures, daily wear and tear will be very serious. Whether it is highway railway bridge erecting machine, urban light rail bridge erecting machine, railway bridge erecting machine, etc., if the bridge erecting machine is lack of corresponding daily maintenance and repair, it is easy to cause abnormal operation or misoperation of important parts, and then greatly increase the overturning probability of the bridge erecting machine.
3. Improper operation of construction personnel
Improper operation of construction personnel is an important factor in the overturning of bridge erecting machine. If the engineering construction personnel build the subgrade in strict accordance with the standard of subgrade construction, strictly inspect and reduce the hidden dangers of equipment. In the two stages with high probability of safety accidents during beam erection, such as through-hole and side beam erection, if the construction personnel operate completely according to the work specifications, the probability of overturning accident will be greatly reduced.
4. Unqualified construction foundation quality
The unqualified quality of subgrade is also one of the important reasons for the overturning of bridge erecting machine. If there is a section between the construction abutment and the filling at the bridge head that is not compacted, it is usually a place with more potential safety hazards. The selection of the line has not been scientifically investigated. In case of curve sections and uneven slopes, plus the super elevation of the outer rail of the bridge erecting machine, the fuselage will tilt and cause overturning accidents.
