How scary is China's bridge technology

China's bridges have been very hot lately. At the beginning of the month, the 430-meter glass bridge in Zhangjiajie merged into a dragon, hitting 10 "world's best"; in the middle of the month, the Qingshui River Bridge in Guizhou, which is about to be closed, attracted the admiration of the foreign media - it is the second-highest suspension bridge in the world (the first one is the Sidu River Bridge in Enshi, Hubei). However, the most shocking to the outside world is two videos: one is in mid-November, Beijing Sanyuan Bridge, the use of 1,000-ton pack transport frame machine to achieve thousands of tons of bridges as a whole girder replacement, within 43 hours, "the old bridge into a new bridge"; one is a hot rumor in October, "China's superb bridge-building technology! One is the video of "China's superb bridge-building technology", which was widely circulated in October: a bridge-building machine carrying a section of the bridge deck slowly drove out of the tunnel, and then steadily placed the bridge deck between the two piers - just like building blocks in general. These spectacular scenes and "China's speed" not only attracted the praise of the domestic people, foreign netizens and the media are also stunned: China's bridge technology is so advanced? Reporter interviews found that China's bridge technology is now in the world's leading level, the invention of many difficult bridge technology, China's construction of the bridge is not only the domestic bloom, also made great achievements overseas.

"I give the Sanyuan Bridge 'surgery'"

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Guizhou Qingshui River Bridge to attract the world's awe

"Remember 'Traffic Jam Doomsday'? The massive freeway widening project in Los Angeles was expected to paralyze the entire city (it didn't), and it took an entire weekend just to demolish one overpass," writes the US website, "but earlier this month (November), an overpass on a major artery in Beijing went from demolition to complete replacement in less than two days. "

This is the case of the Sanyuan Bridge 1,350-ton bridge total girder replacement project, which took just 43 hours from start to finish. In the center of the metropolitan area can be so cleanly completed bridge replacement, no wonder the outside world will issue a gasp. Just behind this project, few people know that a Chinese company occupied 30 of the 43 hours, and it was after these 30 hours that the shock of the whole replacement of the new bridge with a pack beam truck was realized.

The company is Beijing Fayan Engineering Technology Co., Ltd, which is responsible for the old bridge cutting part of the project. "Cutting and dismantling the old bridge is the first part of the whole project, and if there are problems or delays in this part of the project, it will result in the extension or failure of the whole bridge replacement period," said Pan Hongbao, the company's founder and general manager, in an interview.

According to Pan Hongbao, the Sanyuan Bridge overall replacement technology in Beijing Jingzang Highway, Changping District, Xiguan traffic circle has a successful application of the precedent, only that the pack tonnage is slightly smaller. He said that the original program of the project to the Beijing Development Research cutting time is only 3 hours, "we have completed the cutting of the side span, has been waiting for the whole of the middle span of the pack transport. But to (November) 14 morning more than 8:00, the project commander in chief a> Department of temporary adjustments to the program, decided to cut in situ to remove the old bridge in the middle of the span. I later learned that, because the Sanyuan Bridge old bridge damage beyond expectations, has been unable to pack away as a whole, the commanding officer repeatedly study and weigh, consider the safety of the first ultimately decided to the old bridge center span in situ cutting demolition."

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From 3 hours into 30 hours, the old bridge in situ excision has also become the mainstream process of the entire project and the key line. At that time, the entire bridge on the construction staff of more than 200 people, while the construction of the rope saw up to 56 units, Pan Hongbao is the cutting chief commander. "The original plan of 21 hours of the new bridge pack beams and pavement laying time was also compressed to 13 hours, which shows that other construction teams also adjusted the original program, rush to grab a lot of operating time." Pan Hongbao said, rarely such a complex construction environment, and every second counts, good thing the project went smoothly.

Beijing Sanyuan Bridge 1350 tons of bridge overall girder replacement project

The reporter learned that in the old bridge cutting, the Chinese company's level is quite high. Pan Hongbao said, in Japan, professional concrete drilling and cutting company has two listed companies, were established four or five decades, in terms of professional and technical aspects of the Beijing hair research has surpassed these two counterparts. But these two Japanese companies have a larger annual production scale, because Japan is very much recognized this way of cutting and demolition of old buildings. However, because the potential domestic market is so large, Beijing Fayan will soon surpass its Japanese counterparts in terms of scale.

"It's now China's bridge-building era"

While the cutting of old bridges is an important part of this Sanyuan Bridge project, the speed of China's bridge-building lies in innovation in the eyes of the foreign media. "If the demolition of the old bridge is still being done more or less in the traditional way, the new bridge is being erected as a single prefabricated component," says the US website article, adding that the use of modular road components, a topic engineers have been talking about for a long time, is innovation. "As simple as sliding a new sandwich panel into a giant Ikea bookshelf," the US website describes.

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This is visualized in the video "China's Superior Bridge Building Technology". The reporter learned that the video shot is China Railway eleven Bureau of the sixth engineering limited company erected Yuwan Railway Huayu two-lane bridge No. 6, No. 7 pier process, the use of "SLJ900/32 type mobile bridge erection machine". However, China Railway Eleven Bureau of the Sixth Engineering Co., Ltd. relevant personnel interviewed, in order not to disclose industry secrets as the reason for refusing to disclose more information, only that this is an ordinary bridge machine.

The website of China Railway Corporation shows that "SLJ900/32 mobile bridge erection machine" is China's first 900-ton new bridge erection machine with independent intellectual property rights, which was put into use for the first time in July 2013 at the Jiaohe Bridge of Jituhun Passenger Dedicated Line in Jilin Jiaohu County, and has been widely used in the construction sites of high speed railroads such as Shanghai-Kunming and Shendan. It has now been widely used in the construction sites of Shanghai-Kunming, Shen-Dan and other high-speed railways.

China's new railroad bridging machine successfully developed

From the international bridge construction development history, very much "thirty years east, thirty years west" feeling. In the first half of the 20th century, Europe and the United States is more advanced; the second half of the 20th century, Japan is more advanced technology; 21st century is the turn of China. Why this shift? The main reason is that the demand for economic development to promote the development of transportation. 20 century, the United States and Japan, as well as the European countries rapid economic development, the movement of people is large, high demand for transportation. 21st century, China has become the second largest economy, the construction of bridges, high-speed rail and the rapid development of it.

Beijing Jiaotong University long bridge construction and maintenance engineering research and development center director Lei Junqing said, China's vast territory and complex natural environment, decided to grow the demand for bridge construction, coupled with our country is to the urbanization, industrialization, and post-industrialization era of change, traffic and people flow logistics and transportation needs are huge, resulting in the last 30 years China's bridge development of the "Golden Opportunity Period", the result is the construction of all kinds of top-ranking top bridges in the world.

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In terms of the level of bridge building, China is now the world's absolute "leader", the world's all difficult, record-breaking bridges, most of them built by China. Lei Junqing said the bridge height and span is a measure of a bridge construction of the key technology. The larger the bridge span, the thinner the cross-section required to build the bridge, the lighter the material, the better the quality, the stronger the durability; the higher the height of the bridge, the higher the construction of the material transportation, component lifting, construction personnel safety and other requirements. The Beipanjiang Bridge of Hukun High-speed Railway, which was closed on November 19 this year, has an arch span of 445 meters, the largest railroad arch bridge in the world. Located in Hubei Yichang and Enshi junction of the Sidu River Bridge, known as "the world's first high suspension bridge", the tower top to the bottom of the canyon height difference of 650 meters, the bridge from the bottom of the valley 560 meters, equivalent to the height of 200-story building. Foreign such highest bridge for the French Miyao Bridge and the United States Colorado Royal Gorge Bridge, respectively, 307 meters and 290 meters.

According to Lei Junqing, China has a lot of innovative technologies in bridge construction, such as the application of blimps for pilot cable towing operations on the Baling River Bridge in Guizhou, and the earliest application of unmanned aerial vehicles for towing pilot cables across the river on the Longjiang Special Bridge in Yunnan. Some of China's innovative technologies have repeatedly won awards at the international level. since 2000, the International Bridge Association*** in Zurich, Switzerland, has assessed 18 awards in the bridge category, and China has won 6 awards.