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Original title: Humen Bridge in Guangdong rocked abnormally, the reason is this!
On the last day of the May Day holiday, the Humen Bridge in Guangdong shook abnormally. The experts explained that it was a vortex vibration caused by too high a wind speed.
Guangdong Humen Bridge Company issued a notice today that the Humen Bridge was greatly affected by the wind speed of the main bridge and caused vortex vibrations. In order to guarantee the safety of the majority of the passengers and the passengers and the structures of the bridge, as of 15:20 on May 5, the Humen Bridge will be completely closed to traffic control.
On the afternoon of May 5, the suspension bridge of the Guangdong Humen Bridge was swinging on the deck, the amplitude was relatively obvious, causing discomfort while driving. In order to ensure traffic safety, the traffic police in Guangzhou and Dongguan have taken traffic control measures to completely shut down the two-way traffic of the suspension bridge.
According to Humen Bridge professionals, it is normal for bridges to sway in special wind conditions, usually vortex vortices occur and the roof sway is relatively large.
According to the wind data published by the official Weibo of “Weather in Guangzhou”, the Humen Bridge is at 15-17 pm every day, and there are basically 6-7 winds. In general, level 6-7 instantaneous winds are more common and last two hours, which is relatively rare.
The Guangdong Provincial Transportation Group said it has organized maintenance technicians to inspect the bridge and experts to judge. According to the preliminary understanding, the main structure of the bridge has not been damaged, and the specific reason is under investigation.
At 16:00 on the same day, the official “Ping An Dongguan” Weibo issued a guideline for vehicle diversions. The First Financial Reporter learned from the Nansha District Traffic Police Brigade, Guangzhou, that traffic control of the Humen Bridge has not yet been lifted.
The Humen Bridge is located between Guangzhou and Dongguan, in Guangdong province. The main bridge spans the waters of the Pearl Ocean Lion River and is a major transportation hub connecting the east and west sides of the Pearl River and the east and west wings of Guangdong Province. The Humen Bridge project is a six-lane two-way line with a length of 15． 76km. There are 23 bridges, 3 tunnels, and 2 large exchangers. The Humen Bridge main bridge has a total length of 4588 m, including a suspension bridge with a span of 888 m and a continuous rigid frame bridge with a span of 270 m. Among them, the Humen Bridge long-range suspension bridge is a flexible structure.
According to the relevant person in charge of the Humen Bridge Company, the section of the Humen Bridge was overloaded for a long time, which led to the suspension bridge of the Humen Bridge, the eastern approach bridge of the auxiliary waterway bridge, the Bridge Taiping, Guangji Bridge No. 2, Dayong Bridge and Shenwan Bridge. 6 sections of the bridge have different degrees of damage.After extensive testing and evaluation by the relevant traffic detection agencies, the section of the Humen bridge will be implemented to restrict the passage of freight cars and passenger cars with more than 40 Seats in August 2019 to ensure the smooth and safe operation of the bridge. It also provides conditions for the treatment and maintenance of diseases step by step.
The Humen Bridge was put into use on June 9, 1997, and was the first major suspension bridge in China. Humen Bridge traffic volume increased from an average of 18,400 standard vehicles per day when it was built in 1997 to a maximum daily average of 170,000 standard vehicles, well above the design standard for an average daily average of 80,000 vehicles, with a saturation of 2.1.
The increase in traffic volume reflects the rapid development of Guangdong’s economy, and also causes the entire structure of the Humen Bridge to be overloaded for a long time, and there is an urgent need to maintain “decompression”. The opening of the Nansha Bridge effectively alleviated the pressure on the Humen Bridge, and also provided conditions for temporary traffic control of the Humen Bridge.
Currently, the Huangpu Bridge, the Nansha Bridge, the Humen Bridge, and the Hong Kong-Zhuhai-Macao Bridge have been opened to traffic in the Pearl River Estuary. Traffic between the east and west sides of the Pearl River estuary has greatly improved compared to the past. The deep and middle channel that currently crosses the Pearl River estuary is also under construction. It will open in 2025. In addition, Guangdong Province has planned various roads, railway bridges and tunnels through the Pearl River estuary in the medium and long term.
Not long ago, the Yangtze River Bridge of Wuhan Parrot Island also experienced a similar tremor on the deck. According to the announcement issued by the Wuhan City Investment Group, at 14 o’clock on the afternoon of April 26, the deck of the two-way bridge of the Parrot Island Yangtze River Bridge experienced noticeable oscillation of rising waveforms and descending. Maintenance unit Wuhan City Investment Group Company immediately notified the bridge design unit and relevant experts to conduct field studies to analyze the causes of the abnormal vibration. Currently, experts believe that abnormal bridge vibration is caused by specific wind conditions and the amplitude is within the design allowable range; The bridge structure is operating normally.
In this regard, Peng Xumin, deputy chief engineer at the Chinese Academy of Railway Bridge Engineering, once explained that the Parrot Island Bridge is a suspension structure and belongs to a flexible bridge, unlike the Yangtze River Bridge, which is a steel structure. Under the effect of strong pressure, the deformation of the bridge body will be relatively large, and the displacement is greater than other bridges.
Editor-in-chief: Chen Zhijie
