Humen Bridge in Guangdong is inspected every year. Why are the main cables and slings seriously corroded?

Humen Bridge in Guangdong is inspected every year. Why are the main cables and slings seriously corroded? Indeed, for several days in a row, the abnormal vibration of Humen Bridge has aroused widespread concern about the safety of Humen Bridge. But how can the main cables and slings of Humen Bridge, which is inspected every year, be seriously corroded? The authoritative official has denied the rumor, and the information appearing in this news is not this year!

On May 10, the latest discovery of Humen Bridge was uploaded to the Internet, which roughly stated that the first violent shaking of Humen Bridge, and then repeated slight shaking, was not due to the bridge vortex vibration caused by the water horse and wind conditions announced by bridge experts, but because of the problems of the main cables and slings of the bridge structure. The problems are listed as follows: the steel wire rope of No.38 sling on the upstream side of Humen Bridge has been broken, and the inside of the old sling has been seriously corroded, especially near the mid-span position of the main cable, both the top surface and the ground have been seriously corroded.

Because these explanatory materials are specific and detailed, plus a few photos that can show exactly how many slings of Humen Bridge were damaged due to corrosion, and screenshots similar to the information in the test report were released. Therefore, many netizens who don't know the truth choose to believe this rumor. Only a few rational netizens found that the real shooting time of the photo should be 20 19 through technical repair.

In order to avoid the panic caused by information asymmetry, authoritative officials consulted the maintenance records of Humen Bridge 20 19. Indeed, Humen Bridge was built twice in 20 19, once on March 2, 20 19 and once in August, 20 19. For the first time, the steel boxes of suspension bridges K36+800 to K38+300 were mainly inspected and maintained. The second time, Humen Bridge continued to be overloaded for a period of time, so that both ends of the six bridges of the bridge were damaged to varying degrees. Therefore, at the same time of bridge maintenance, the vehicles that could pass in the past were restricted.

After the first violent shaking of Humen Bridge and several slight abnormal shaking afterwards, not only the experts who detected the bridge problems fell into the saliva whirlpool of some netizens, but also the academicians who participated in the design and manufacture of the bridge, especially the designer of Humen Bridge, Academician Brandon Lee. And this bridge expert, who is blessed by two professional auras, an academician of the two academies and one of the world's top ten famous engineering experts, has been doing his best for the bridge cause of the motherland.

We need to clarify a basic fact. According to the field investigation of bridge experts, the abnormal vibration of Humen Bridge occurred on the afternoon of May 5, which was actually caused by the water horse installed on the bridge under the specific wind force. In essence, this process leads to the change of aerodynamic shape of steel box girder.

However, after the water horse of Humen Bridge was demolished, Humen Bridge experienced several slight wobbles in the following time, not because the expert's judgment was inaccurate, but because it took some time for the energy to be completely released, which can be seen from the fact that the subsequent wobbles were far from the first violent. In a word, bridge experts, after repeated investigations and studies, agreed that the structural safety of Humen Bridge would not be affected by this abnormal vibration event, whether at that time or a few days later.

In other words, the abnormal vibration of Humen Bridge only brings temporary discomfort to passers-by, but it does not endanger the safety and reliability of bridge operation. Although Humen Bridge has not resumed operation after abnormal vibration, it is not because bridge experts do not know why the vibration occurred, but mainly because it takes some time to calm down the energy generated by abnormal vibration for safety reasons. So don't misrepresent a lot of false information. The so-called rumor ends with the wise. I believe that the cultural education received by contemporary people can help us distinguish what is truth.