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Analysis of the Causes of Bridge-Erecting Machine Accidents – Introduction to Human Factors
With the development of railway construction, Bridge erector Its use is becoming increasingly frequent, and bridge-erection machine overturning accidents occur from time to time.
Derailment or capsizing of bridge-launching machines often results in severe consequences, including the destruction of the equipment and loss of life. Once such an accident occurs, not only does it take a long time and substantial funds to restore and repair the machine, but the progress of bridge erection and railway construction is also seriously affected.
In particular, with the rapid development of China’s high-speed railway network, the use of bridge-launching machines in high-speed rail construction will become increasingly frequent, thereby increasing the risk of casualties and losses resulting from capsizing accidents.
Analysis of the Causes of Bridge-Erecting Machine Accidents – Human Factors
Almost every accident, without exception, involves human factors. In fact, if the subcontractors responsible for subgrade construction strictly adhere to the “Code for Railway Subgrade Construction,” subgrade quality can be reliably ensured, thereby eliminating potential safety hazards; similarly, if the girder-erection units rigorously follow the “Rules for Girder Erection Using Railway Bridge-Erecting Machines,” overturning accidents can be prevented. However, some construction firms suffer from low worker competence, weak sense of responsibility, and inadequate technical skills. Moreover, in certain organizations, leadership fails to fully implement established procedures, resulting in arbitrary command, improper operations, and non-compliance with standardized construction practices. During construction, some workers, in an effort to expedite the project and reduce labor, engage in unauthorized practices, omitting essential procedures or safety measures—for example, conducting insufficient compaction or even skipping it altogether, or knowingly proceeding despite poor subgrade quality in the hope of getting away with it.
Since the track-laying volume is a key performance indicator under the jurisdiction of the Ministry of Railways and a primary statistical metric for assessing the progress of railway construction, the track-laying schedule allocated to the track-laying contractor in the construction organization plan is inherently very tight. However, during actual construction, subgrade contractors and bridge-and-tunnel contractors often delay the track-laying schedule, while the overall project duration remains unchanged or even advances, thereby further compressing the time available for track laying. Under such circumstances, in order to meet the tight schedule, track-laying and girder-erection units are forced to work around the clock, leading to severe physical and mental exhaustion among workers. Moreover, to accelerate progress, they sometimes deviate from prescribed construction procedures, resulting in poor track alignment quality and creating potential safety hazards when bridge-launching girders pass over the tracks. In addition, when constructing bridges using bridge-launching equipment, contractors frequently skimp on essential safety measures in an effort to shorten the schedule, which significantly increases the likelihood of accidents.
Keywords:
Bridge erector
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