YangMingTan Bridge

YangMingTan Bridge

Yangmingtan bridge, located on the Songhua River in Harbin, Heilongjiang Province, is the longest super large river crossing bridge in the north of the Yangtze River. It was opened to traffic on November 6, 2011. The bridge starts from Shimao Avenue in Songbei District in the north, crosses Qianjin dyke, Songhua river channel and Qunli Dyke on the North Bank of Songhua River in turn in the south, and then connects with Jiangnan third ring elevated road. The total length of the bridge is 7133 meters, and the length of the bridge is 6466 meters. The main bridge adopts self anchored suspension cable and double tower portal structure system. The height of the main tower is 80.5 meters, the main span is 248 meters, the anchor span on both sides is 108 meters, the transition span on both sides is 46 meters, and the width of the main bridge is 41.5 meters The steel-concrete composite beam structure is adopted for the main span and two side anchor span, and the single box Duobao prestressed concrete box beam structure is adopted for the transition span. The approach bridge adopts cast-in-place continuous beam and simply supported continuous box girder structure, with a width of 36m, two-way 8 lanes and 2m sidewalks on both sides of the river crossing part. The design load of the bridge is highway class I, and the main channel can meet the traffic standard of Songhua River class III channel. The design speed is 80 km / h, which can meet the traffic demand of 9800 vehicles per hour in peak period.

General situation

Yangmingtan bridge is located on the main stream of Songhua River in the west of Harbin city. It is named after the main bridge crossing yangmingtan island of Songhua River. The project started construction on December 5, 2009 and was completed and opened to traffic on November 6, 2011, with an estimated total investment of 1.882 billion yuan. It is the first suspension bridge (double tower self anchored suspension bridge) in Harbin, with a total length of 7133 meters, including 6464 meters of bridge, 669 meters of connecting road, 9800 vehicles per hour, 41.5 meters of deck width, two-way 8 lanes, 427 meters of main bridge span, 80 meters of main tower height, and no less than 10 meters of navigable net height under the bridge, which can meet the navigable requirements of the third class channel of Songhua River.

Yangmingtan bridge is a major urban construction project of the province and the city. It is also another large bridge project across the river organized by Harbin City after Songpu bridge. Yangmingtan bridge starts from the intersection of the Third Ring Road in Songbei district and Shimao Avenue in the north, crosses Jiangbei flood dike, yangmingtan Island, main channel of Songhua River and Jiangnan Qunli flood dike in the south, and then relaxes with yangmingtan bridge in Qunli new district It is now connected with the completed Songpu bridge.

On August 24, 2012, the separated ramp of the Third Ring Road Qunli Viaduct on Honghu Road, which is 3.5km away from the south end of yangmingtan bridge, overturned, causing four large trucks to fall off the bridge. The section where the accident occurred is located in the Qunli viaduct project of the Third Ring Road, which belongs to two construction projects respectively with yangmingtan bridge.

Relevant units

construction control unit

Jin Linsheng, deputy director of yangmingtan bridge project, introduced to the reporter: "high quality projects can not be separated from high-quality supervision team. The supervision team represented by Heilongjiang highway engineering supervision consulting company conscientiously performs the supervision responsibilities and becomes the real quality guard of yangmingtan bridge project."

Construction unit

Second navigation bureau of CCCC

China Railway Construction 13 Bureau Group 4 company

Longjian road and Bridge

The construction unit in China is Fujian Communications Construction Group Engineering Co., Ltd

China Railway First Group Bridge Engineering Co., Ltd

Relief project

After the completion of yangmingtan bridge, the traffic flow around it will increase. In the initial design, we considered the simultaneous construction of the relief project, which will eventually become a part of the third ring road.

Yangmingtan bridge relief project connects yangmingtan bridge in the north and Wanggang street in the south. It will cross Youyi West Road, Qunli Avenue, hasshuang North Road and airport expressway to Yingbin Road in the middle. After 2 km, it will cross Beijing Harbin railway line to Wanggang street, with a total length of 8.3 km. Among them, 6 km is viaduct, with 10 ramps. The width of ground auxiliary road will not be less than 4 km Vehicle Lane. The project includes viaduct, Jingha underpass bridge, auxiliary road and approach road, which was started in February 2011.

Collapse accident

The course of the accident

At about 5:30 on August 24, 2012, the separated ramp of Qunli viaduct Honghu Road on the Third Ring Road, the approach bridge of yangmingtan bridge in Harbin, broke, and the collapsed girder was about 130 meters long, belonging to the overall collapse. As a result, four trucks fell off the bridge, the cab of some overturned trucks was completely smashed flat, and the bloody steering wheel and other objects flew out and landed. According to the fire department, three people were killed and five injured on the day of the accident.

Command and rescue

At about 5:30 on the 24th, the last section of the main bridge of the yangmingtan bridge of Harbin Airport Expressway was crushed by four heavy-duty trucks, which rushed down the bridge from Jiangnan to Jiangbei. Preliminary understanding, the accident caused three deaths and five injured. Song Xibin, mayor of Harbin, is directing the rescue work at the scene, and relevant departments of Harbin have arrived at the scene. The cause and responsibility of the accident are under further investigation.

The main bridge and other ramps of yangmingtan bridge have been fully opened to traffic except for the ramp section where the accident happened.

Accident investigation

Yangmingtan bridge was completed in 18 months.

Yangmingtan bridge was built at the end of 2009, and accidents occurred during the construction.

According to media reports, on September 23, 2012, during the construction of the 13th section of yangmingtan bridge, the side beam slipped, causing five workers under construction to fall from a 20 meter high bridge and be injured. The construction party believes that this is only an accident in the construction process and does not affect the overall construction progress of yangmingtan bridge. The bridge will continue to be constructed 24 hours a day to ensure that it will be opened to traffic in November of that year.

According to the data, yangmingtan bridge starts from the intersection of the Third Ring Road and Shimao Avenue in Songbei District in the north, crosses the Songhua River Channel in the south, and connects with the third ring elevated road. It has a total length of 15.42 km (including 8.29 km yangmingtan dredging project), a width of 41.5 m, two-way 8 lanes, and a design speed of 80 km / h. It can meet the traffic demand of 9800 motor vehicles per hour at the peak.

The concrete used in Harbin broken bridge is mixed with wood woven bags

In the collapsed bridge body, filled with a mixture of cobbles, sticks and woven bags, the reinforcement is laid in the box girder, and no binding is seen. The collapse accident happened on a ramp of the south approach bridge of yangmingtan bridge on the West Third Ring Road in Harbin. Near the intersection of the Third Ring Road and Honghu Road, it belongs to Qunli new district. There are many new residential buildings nearby, a few of which have been occupied and most of which are still under construction.

The accident was not far from Harbin Taiping International Airport. From Harbin Taiping International Airport to Harbin City, after passing the first ring island at the junction of the city and suburb, it is about two kilometers north along the viaduct of the Third Ring Road, which is the scene of the accident.

3. The load of freight car exceeds the design by seven or eight times

Wang Zonglin said that at the time of the accident, there were three large trailers parked in the middle of the collapsed bridge, each of which was conservatively estimated to be between 120 tons and 150 tons. In addition, there was another one which was far away and slightly damaged, about 30 tons. "According to the injured person's recollection, all three carts were parked outside the bridge. From the scene, the three cars were parked close to each other, with a total weight of nearly 500 tons on one side. "

In design, the load capacity of the bridge is 50 tons in one direction, that is to say, a single lane passes a truck with a load of 50 tons at a time. Three cars parked, nearly 500 tons of weight, equivalent to seven or eight times more than the bearing capacity of the bridge. "It causes partial load on the bridge body and makes the whole bridge overturn."

Survey results

On the afternoon of September 19, 2012, Harbin released the investigation results of "8.24" ramp overturning accident at Hongfu section of Qunli Viaduct on the third ring road. The nature of the accident is a major road traffic accident, which is caused by the serious overloading of vehicles and the overturning of ramp and vehicles falling to the ground, resulting in casualties.

According to the analysis opinions of the expert group, the inspection conclusions of the inspection institutions and the investigation and evidence collection of the investigation group, the direct cause of the accident of the up ramp overturning, vehicle overturning and casualties on Hongfu road of Qunli Viaduct on the third ring road is that Wang Zhiwu drives the overload truck, and Zhang Huibo and Liu Guodong drive the seriously overloaded vehicle without changing the shape and technical data, which is within the 121.96 meter long beam body At the same time, the steel-concrete composite beam was driven to the right, which resulted in one side of the steel-concrete composite beam under partial load and serious overload, resulting in overturning.

Indirect causes:

1. On August 24, 2012, Lanling squadron and Xinxing squadron of Shuangcheng Traffic Police Brigade did not find the accident vehicle passing through the section under their jurisdiction.

2. Harbin highway management office didn't consider the request of the superior to dispatch law enforcement personnel to reinforce Wanggang Town section of Beijing Harbin highway reconstruction project. Eight law enforcement officers were all transferred from the shuangchengyang section of Beijing Harbin highway, resulting in the omission of Road Administration inspection.

3. On August 23, 2012, the highway management section of Dehui City, Jilin Province punished vehicles 2-4 and failed to take unloading measures as required.

Nature of the accident: after obtaining evidence, according to the expert analysis and the conclusion of the national construction engineering quality supervision and inspection center, the accident investigation team determined that the accident was caused by the ramp overturning caused by the serious overload of vehicles, the vehicles overturned on the ground, causing casualties.

Determination of accident liability

Chinese PinYin : Yang Ming Tan Da Qiao