How was the Harbin Bridge collapse accident handled in the end? Any insiders know?
Harbin reported that the direct cause of the bridge collapse accident was vehicle overloading
September 19, 2012 15:46 Northeast Net I want to comment (134)
Font size : T|T
Photographed by Zhou Yimei at the scene of the bridge collapse accident
Northeast Network (Weibo) News on September 19 (Reporter Chen Jing) On the afternoon of the 19th, Harbin City issued "8.24" Investigation results of the overturning accident on the upramp of the Hongfu section of the Qunli Viaduct of the Third Ring Road. The nature of the accident was a major road traffic accident in which the ramp overturned and the vehicle fell to the ground due to serious overloading of the vehicle, causing casualties.
Harbin reported accident investigation results: caused by vehicle overloading
Category: News New function to zoom in and watch
According to the analysis and opinions of the expert group and the inspection conclusions of the testing and inspection agency The investigation team investigated and collected evidence and determined that the direct cause of the overturning of the upramp on Hongfu Road of the Qunli Viaduct in the Third Ring Road, the vehicles falling to the ground, and the casualties were caused by Wang Zhiwu driving an overloaded truck, and determined that Zhang Huibo and Liu Guodong drove severely overloaded vehicles that changed their appearance and technical data without authorization. , driving on the right simultaneously within the 121.96-meter long beam, causing one side of the steel-concrete composite beam to be severely overloaded and overloaded.
Indirect reasons:
1. On August 24, the Shuangcheng Traffic Police Brigade Lanling Squadron and Xinxing Squadron did not find the accident vehicle passing through the road section under their jurisdiction.
2. The Harbin Municipal Highway Management Office did not consider the request from superiors to dispatch law enforcement personnel to reinforce the Wanggang Town section of the Beijing-Harbin Highway Reconstruction Project. All eight law enforcement officers were transferred from the Beijing-Harbin Highway Shuangcheng Road Maintenance Section, resulting in omissions in road inspection work.
3. On August 23, the Highway Management Section of Dehui City, Jilin Province punished vehicles No. 2-4 for failing to take unloading measures as required.
Nature of the accident: After collecting evidence, the accident investigation team determined that the accident was caused by the ramp overturning due to severe overloading of the vehicle, and the vehicle fell to the ground, causing Serious road traffic accidents involving casualties.
Accident liability identification and handling opinions: Personnel involved in the vehicle causing the accident will be transferred to the Harbin Municipal Public Security Traffic Control Department for handling according to law. Shuangcheng Traffic Police Brigade Lanling Squadron, Xinxing Squadron and Harbin Municipal Highway Management Office were handed over to the Municipal Supervision Bureau for serious accountability. Regarding the violations in the process of punishing overloaded trucks in the Dehui City Road Administration Section of Jilin Province, the transportation management department of Heilongjiang Province will be reported to the Jilin side and will be investigated and dealt with in accordance with relevant regulations.
Earlier report: Officials said the collapsed bridge cost 7.09 million and the structural modification cost 200 million.
Beijing Times: On the afternoon of August 27, the Harbin Municipal Government notified the design and construction of the collapsed bridge. And the supervision unit: the design unit is Harbin Municipal Engineering Design Institute, the construction unit is Fujian Communications Construction Group Engineering Co., Ltd., and the supervision unit is Heilongjiang Baixin Construction Engineering Co., Ltd. When interviewed, the three units claimed to operate strictly according to regulations. According to information previously released on the Harbin Municipal Government website, the structure of the Yangmingtan Bridge deconstruction project has been changed. The concrete structure designed in the original project was changed to a steel-concrete structure, which shortened the construction period and saved steel costs of 200 million yuan.
Announce information on 4 trucks
At about 5:00 on the 24th, the steel-concrete composite beam at the upramp of Honghu Road of the Third Ring Road Viaduct in Harbin slipped sideways and 4 trucks rolled over. 3 people were killed and 5 injured.
At 18:20 on the 27th, the Harbin Municipal Government held its third press conference after the accident. The press conference was still conducted by Huang Yusheng, secretary-general of the municipal government, and there was still no question-and-answer session.
This press conference*** lasted 5 minutes. After the meeting, Wu Xiangyang, the commander-in-chief of the Yangmingtan Bridge and deputy director of the Harbin Municipal Construction Committee, was once again "chased and intercepted" by the media. However, Wu Xiangyang remained silent in the face of questioning.
At the press conference, Huang Yusheng announced the license plates and models of the four accident vehicles. They are numbered 1-4 from front to back, and the No. 1 truck, black AH3976, is a Dongfeng brand heavy-duty warehouse-type truck.
Vehicle No. 2, Liao M45170, is an Auman brand heavy-duty semi-trailer tractor. Car No. 3 is black E52268, an Auman brand heavy-duty semi-trailer tractor, and Car No. 4 is black L82392, a Haoli brand heavy-duty semi-trailer tractor. As for the injured, except for one who is in serious condition, the other four have improved.
The collapsed ramp cost 7.09 million
At the press conference, Huang Yusheng once again emphasized that the collapsed bridge had nothing to do with the Yangmingtan Bridge. The accident area was the detached part of the Qunli Viaduct on the Upper Third Ring Road. The ramp has a beam length of 121 meters, a width of 9 meters, and a slope of 3.5. It is an independent overall steel-concrete composite beam. Huang Yusheng said that according to relevant engineering data, the cost of the ramp project is 7.0942 million yuan, and the construction period is 90 days.
According to reports, the design unit of the collapsed bridge is Harbin Municipal Engineering Design Institute, with Grade A qualification in the municipal industry; the construction unit is Fujian Communications Construction Group Engineering Co., Ltd. (referred to as Fujian Communications Construction Group), with qualification It has Level 1 general contracting for municipal public engineering construction and Level 1 general contracting for highway engineering construction; the supervision unit is Heilongjiang Baixin Construction Engineering Co., Ltd., and its qualification is Grade A for municipal public engineering supervision.
Wu Xiangyang said that the "Yangmingtan Bridge Relief Project" used by the Harbin Municipal Construction Committee as the name of the accident area during the bidding process was a "common name."
The reporter inquired about the tender document for the project and learned that the Yangmingtan Bridge decontamination project has a total length of 8.3 kilometers and a planned red line of 70 meters. The viaduct is 6,000 meters long, the road is 2,300 meters long, and there are 5 pairs of ramps along the viaduct extension. The project quality requires striving to win the Luban Award for Quality Projects, and the construction period requires it to be opened to traffic before October 31, 2011. The collapsed area is one of the five ramps.
Expert evidence collection has been completed
Huang Yusheng introduced that after all seven national experts from the accident appraisal team arrived in Kazakhstan on the evening of the 25th, they further inspected the scene and compared the actual measurements on the scene with the Relevant data such as bridge design, construction standards, pier support, box girder structure, and bridge deck quality were repeatedly calculated, and interviews were held with design, construction, and supervision units. At present, on-site inspection, evidence collection and other work have been completed, and accounting and verification work is in progress, and relevant procedures will be performed on this basis.
At the accident scene on the 27th, the reporter saw that the collapsed bridge deck and piers were marked with numbers in red paint. The bridge deck was marked from "K1" to "K10", and the bridge piers were marked with numbers from "K1" to "K10". "0115" to "0118".
As for when the investigation results will be announced, Wu Xiangyang said, "You have to ask the experts."
□Responses from all parties
gt; gt; Design unit
After calculation and design, there is no problem
On the morning of the 27th, Harbin Municipal Engineering Director Li of the Design Institute Office said that the collapse project of Yangmingtan Bridge was designed by his unit and the engineer was also from his unit. Relevant leaders and designers of the design institute have been on site and actively cooperated with the investigation by the State Administration of Work Safety and the expert group. They also hope to reach a conclusion as soon as possible. Based on the design drawings and data at the time, and through calculations, they believed that there was no problem with the design.
According to Director Li, the design institute mainly undertakes municipal projects, mainly key projects in Harbin, and their competent department is the Harbin Urban Management Bureau.
It is understood that Harbin Municipal Design Institute has Class A urban road, transportation, bridge, water supply, and drainage design qualifications. Its business scope also includes Class A urban sewage and industrial wastewater treatment, industrial and civil construction, and electrical engineering. , engineering survey, etc.; the hospital has six professional departments of roads and bridges, water supply and drainage, construction, gardening, electrical, surveying and mapping, and three management departments of the business department, the general engineering office, and the office.
gt;gt;Construction unit
There is no outsourcing of materials from Party A
The relevant person in charge of the Fujian Communications Construction Group Office confirmed on the 27th that they were indeed responsible for the collapsed bridge The contractor. On the morning of the incident, the company leaders and chief engineer immediately went to Harbin. The company also set up an investigation team on the matter.
The person in charge said that they did not outsource the collapsed bridge. It was built by the company itself. The construction personnel strictly followed the design requirements and construction standards to build it. They are a powerful company and this project is not very serious. Big, not too difficult for them. All construction materials will be provided by Party A.
According to his introduction, the Communications Construction Group was mainly engaged in projects within the province and surrounding areas. In order to expand its business, it participated in the bidding for the Yangmingtan Bridge decontamination project. As for the cause of the collapse, he could not express his position, saying that anyone with a little bit of expertise would understand.
It is understood that the company has participated in the construction of many key projects such as Xiamen Yanwu Bridge, Wuyuan Bridge, and Airport Road. The company has also won the honor of "Reliable Engineering Demonstration Unit" in each year from 2006 to 2011, the Zhan Tianyou Award in 2009, and the honor of "AAA Credit Enterprise" in each year from 2006 to 2011.
The supervision company stated on the evening of the 27th that strict standards will be implemented during the supervision process, but everything will have to wait until the investigation results are released.
□Investigation
There were many cracks in the uncollapsed area
At 11:00 on the 27th, the accident scene had been cleared, leaving only the collapsed bridge lying on its side. On the road, the police cordon also moved inwards a lot. According to workers, the cleanup work lasted from the evening of the 26th to the dawn of the 27th. Under the main bridge of the Qunli Viaduct, workers who had been busy all night were still sleeping on the ground with quilts spread under them.
Entering the enclosure, the collapse location is located in the middle of the uphill ramp, about 100 meters away from the bottom of the ramp, where it connects to Honghu Road. The bridge body within this distance is intact, but careful observation reveals that the bridge There are many cracks on the body. A rough count shows that there are at least 10 gaps about 1 meter long, and the steel beams in the piers have protruded.
Bridge experts said that there are many possibilities for the occurrence of cracks. One possibility is a secondary disaster caused by collapse, and the other possibility is insufficient maintenance during the pouring of concrete, such as water leakage. Not enough will cause cracks.
The decontamination project will save RMB 200 million for structural reform
The reporter inquired on the 27th and found that the official website of the Harbin Municipal Government issued a document on September 29, 2011 stating that the entire Yangmingtan Bridge decontamination project will adopt 8 sections. A composite continuous beam structure composed of "U-shaped steel beams" and reinforced concrete (tóng, meaning concrete). According to the original engineering design, the eight main ground sections of the deconstruction project all used concrete beam structures. However, due to the practical problems of large quantities of work, long construction period, and difficult to control the quality of this structure, the headquarters organized the design unit to conduct repeated demonstrations. At the same time, drawing on the achievements of advanced bridge structures at home and abroad, it was decided to adopt a composite continuous beam structure composed of 8 sections of "U-shaped steel beams" and reinforced concrete on the entire line.
The article also stated that the new "composite beam" China Steel The amount of steel used per square meter in the beam part is 300 kilograms. The conventional closed steel box girder uses 650-750 kilograms of steel per square meter. Therefore, more than 300 kilograms of steel can be saved per square meter. The 8-section "U-shaped steel beam" "***Save about 20,000 tons of steel and more than 200 million yuan in funds. After installation, the "U-shaped steel beam" has the characteristics of withstanding large pressure, good bridge steel performance, and economical cost.
Explanation The "U-shaped steel beam" of the project is constructed using a construction method that is prefabricated in the factory and transported to the site for installation. The fabrication and processing can be carried out simultaneously with the lower concrete infrastructure, which greatly shortens the construction period and effectively controls the construction quality.
Wu Xiangyang confirmed the above statement
■Expert statement
Changing the structure affects the balance of the bridge
A bridge expert who did not want to be named said. , Concrete beam structure is a concrete structure. The biggest difference between concrete structure and steel-concrete composite structure (referred to as steel-concrete structure) is that in terms of weight, concrete is much heavier than steel. In terms of construction period, concrete is poured and the process is complicated; The steel structure only needs to be tied up, so it saves time.
Experts said that the most important issue in this collapse was balance. The concrete structure is much more stable than the steel structure because of the different weight. A big man and a thin person are standing there. If you push, the big man may not move, but the thin person may fall over. The weight is concentrated on one side but not on the other side. In addition, the bridge is not balanced enough. It fell down
Our reporter Su Xiaoming and our intern reporter Wang Mingting