1. What are the causes of bridge erecting machine accidents
With the development of railway construction, railway bridge erecting machines are used increasingly frequently, and overturning accidents of bridge erecting machines occur from time to time. . Derailment and overturning of bridge erecting machines often result in serious consequences such as machine damage and fatalities. Once an accident occurs, not only will it take a long time and a lot of money to restore and repair the bridge erecting machine, but it will also seriously affect the progress of bridge erection and railway construction. In particular, as my country’s development of high-speed railways is gradually accelerating, bridge erecting machines will be used more frequently in high-speed railway construction. If an overturning accident occurs, the casualties and losses will be greater. Through statistical analysis of bridge erecting machine accidents, the causes of the accidents can be attributed to the following aspects.
1. Human factors
Almost every accident without exception contains human factors. In fact, if the construction unit of the lower part of the project builds the subgrade strictly in accordance with the “Railway Subgrade Construction Specifications” and ensures its quality without leaving any hidden dangers of accidents; if the erection unit constructs the subgrade strictly in accordance with the “Rules for Railway Bridge Erection Machine Beams”, then there will be no accident. Overturning accident. However, some construction companies have low-quality employees, low sense of responsibility, and poor technical skills. Some unit leaders do not implement the system well enough, give blind orders, operate randomly, and do not follow standardized construction and production. Some construction workers work in violation of regulations in order to speed up and save trouble during the construction process, omitting some necessary procedures or safety measures, such as not pressing the road enough times or even not pressing the road at all, knowing that the quality of the roadbed is not good but still passing by luck, etc.
Since the number of track laying is an important indicator controlled by the Ministry of Railways, and is also the main statistical indicator used by the country to measure the progress of railway construction, the laying period left for the laying unit during the construction organization design is originally very tight, and during the construction Roadbed construction units and bridge and tunnel construction units often delay the construction period due to various reasons. However, the total construction period remains unchanged or even advances in some cases, leaving less time for laying units. Under this situation, the laying unit had to work overtime day and night to meet the schedule, which made the employees physically and mentally exhausted; in order to meet the construction deadline, they worked quickly and did not follow the rules, so that the quality of the line after track laying was poor, and it was difficult for the bridge erecting machine to pass. Leaving hidden dangers of accidents; when erecting bridges with bridge erecting machines, construction workers often omit relevant safety measures in order to meet the construction deadline, which greatly increases the chance of accidents.
2. Causes of roadbed and lines
Poor quality of roadbed and lines are the main reasons for the overturning of the bridge erecting machine. There are more or less hidden dangers in the roadbed on both new and existing lines, such as graves, rock pits, local backfilling, large rocks or frozen soil blocks, water soaking, and undercurrents seeping from one side of the roadbed to the other. etc. Each of these situations has occurred in one or two bridge erecting machine overturning accidents. In particular, the gap between the bridge abutment and the bridge head filling is often filled with incorrect filling, which is often an accident-prone area. The quality of the line is poor. For example, the outer rail in the curved section is too high, causing the fuselage to tilt, causing an overturning accident. The uneven slope of the line causes the bridge erecting machine to slip and easily cause it to tilt forward.
3.Reasons of the bridge erecting machine
The cantilever bridge erecting machine needs to hoist the beams and align them through the bridgehead roadbed. When traveling, the center of gravity is very high and the axle load is very heavy, making it easy to overturn. Although the single-girder or double-girder bridge erecting machines that are mainly used are much more advanced than the cantilever type, their structures are still not very reasonable. For example, the machine body is long, the weight is heavy, the axle is heavy, the center of gravity is still high, and there is no protective device. Once it is discovered that the bridge erecting machine is tilted, there is no way but to watch it overturn.
4. Poor equipment maintenance
The bridge erecting machine is a large and complex equipment with many operating processes. Problems with each part or process are due to the erection failure. There are also accidents in which a key part of the bridge machine malfunctions or a key process operation error causes the bridge erecting machine to overturn. For example, due to poor maintenance of a bridge crane in a certain unit, the No. 2 car’s brakes failed, causing the No. 2 car transporting the beam to collide with the main machine. The main machine immediately derailed and tilted forward, causing serious economic losses and casualties.
2. How to prevent safety accidents of bridge erecting machines
1. Professional installation and maintenance of bridge erecting machines
The use environment and characteristics of the bridge erecting machine determine that the bridge erecting machine has very strong mobility. The bridge erecting machine needs to be frequently dismantled and dismantled, and it travels to one project site after another. Therefore, the installation quality of the bridge erecting machine is very important to the safety of the equipment. The bridge erecting machine must be installed by a unit with relevant qualifications. In addition, due to the complex structure of the bridge erecting machine, it is recommended to carry out professional repair and maintenance work to ensure the quality and safety of the bridge erecting machine and that its performance can meet the design requirements and engineering requirements.
2. Do a good job in safety inspection management
The construction unit of the road and bridge project is the main body of safety production, clarify the main responsibilities, implement the safety management system, Safety inspections, inspections, and hidden danger inspections are in place.
3. Strengthen pre-job training and eliminate illegal operations
Before employees take up their posts, conduct pre-job training and targeted assessments to eliminate illegal operations. , command, prevent drivers from operating without licenses, improve the safety awareness of workers, improve professional and technical standards, and eliminate unclear equipment and technical information.
4. Timely monitor equipment defects and strengthen inspection of foundations and hidden parts
Before operation, check for several major safety hazards, including: the foundation sleepers are not It is firm, the equipment welds are broken, the oil cylinder leaks or there is a risk of leakage.Risks include the incompatibility of the selection of the bridge erecting machine with the construction site, failure of the outriggers, falling off of the pins, aging and wear of components, etc. Pay attention to the role of the bridge erecting machine safety monitoring system to detect problems early and reduce the occurrence of safety accidents.
5. Improve the technical capabilities of inspection personnel
Construction units should strengthen training on inspection techniques for bridge erecting machine inspection personnel and improve the quality of inspection personnel. Ability to truly discover problems, solve problems, eliminate safety hazards, and reduce the occurrence of safety accidents.
If the website content violates your rights, please contact us to delete it。
