Nanjing Yangtze River Tunnel is a double-tube, double-deck and eight-lane X-tunnel, which crosses the Yangtze River through two lines, with the upper layer from Jiangbei to Jiangnan and the lower layer from Jiangnan to Jiangbei. The southern line is 7363 meters long; The total length of the northern line is 70 14m. The two tunnels have two floors, each with two lanes in one direction. The design speed is 80km/h and the speed limit is 60km. The designed daily traffic capacity is100000 vehicles. The total investment of the whole project is about 5.2 billion yuan.
From July 2, 2005 to July 2, 2065438, Nanjing Yangtze River Tunnel was successfully completed, which is the largest tunnel of its kind in the world, with the longest length, the most complicated geology and the highest water pressure. 20 1 6 65438+1October1,Nanjing Yangtze River Tunnel was officially opened to traffic.
geographical position
Nanjing Yangtze River Tunnel is divided into north and south lines, and there are two entrances in the south of the Yangtze River, one near the Hyde Acropolis on the Yangtze River Avenue and the other at Dinghuaimen Street. The total length of the tunnel is 7368 meters, and it uses a two-way eight-lane double-deck tunnel to cross the river, with a design speed of 80 kilometers per hour.
Nanjing Yangtze River Tunnel starts from the west side of Dingshan Turntable in Zhujiang Town, Pukou District, Nanjing, and passes through the planned Shazihe Road and Jiangbei Binjiang Avenue. After crossing the Yangtze River and Binjiang Avenue in the south of the Yangtze River in the form of a tunnel, the south tube tunnel is connected with Dinghuaimen Avenue, and the north tube tunnel is connected with Yang Zijiang Avenue, with a total length of about 7.2 kilometers.
The designed daily traffic volume of Nanjing Yangtze River Tunnel is100000 vehicles, and it is planned to be completed in 20 14 years. The total investment of the whole project is about 5.2 billion yuan, and the funds have been put in place 10 billion yuan. As this river-crossing passage is the closest to Nanjing Yangtze River Bridge, it will play a positive role in alleviating the traffic pressure of the Yangtze River Bridge that is overloaded all day.
There are seven river-crossing passages in Nanjing, including Nanjing Yangtze River Bridge, Nanjing Yangtze River Bridge II, Nanjing Yangtze River Bridge III and Nanjing Yangtze River Bridge IV, Dashengguan Yangtze River Bridge and Nanjing Yangtze River Tunnel. According to the overall urban planning of Nanjing, by 2030, Nanjing Yangtze River will form 16 river-crossing passages, among which 7 railway and rail-crossing passages are planned, so that the traffic network between Jiangnan and Jiangbei in Nanjing will form a network of roads, urban roads, railways and urban rails.
Architectural course editor
In October, 2065438+2004 165438+20, the prototype of this double-decker tunnel has begun to take shape. It enters from Jiangbei, about one kilometer, and the circular tunnel has been isolated into upper and lower floors. Zhang Yaguo, chief engineer of the headquarters of Weisan Road Crossing River Construction Project, revealed that the N line is expected to cross the river in June next year, and the S line is expected to cross the river in August because of its length. According to reports, when crossing the rock stratum, the excavation is generally less than one meter a day, and now it can shield 4 ~ 5 rings a day, that is, 8 to 10 meter.
On the morning of July 2, 2065438 10, after more than 25800 hours of excavation, the shield machine "Tianhe No.1" drilled out of the ground from the south line tunnel of Nanjing Weisan Road. 10 days ago, its twin brother "Tianhe" shield machine also "broke ground" from the northern line tunnel. At this point, Weisan Road crosses the river tunnel. After it is completed and opened to traffic at the end of this year, it takes only 20 minutes to drive from Nanjing Dinghuaimen Street to Pukou Dingshan Town. The reporter learned from the Nanjing transportation department that the Yangtze River Tunnel, Weisan Road and Yangtze River Bridge, including Nanjing Yangtze River Bridge 3 and Bridge 4, are expected to be free in the future.
innovation in science and technology
Weisan Road Crossing River Shield Machine, with cutter head diameter of 14.93m, ranking second in the world. Tool wear is particularly severe when passing through rock layers. Traditionally, it is very troublesome for workers to get in and out of the high-pressure chamber connected behind the cutter head of the shield machine.
The staff innovated and used the saturated pressure to open the cabin and change knives, creating a precedent in the world. Compression chamber with saturation is used for tool changing, that is, the operator lives and rests in the saturated living cabin with set pressure for a long time (15 ~ 30 days) after a pressurizing process, so he can work for 4 ~ 6 hours every day, and then come out after all the tools are changed, and the normal pressure will be restored as long as the pressure is reduced once. Without this technology, the progress of the project would not be so fast.
Safety equipment/devices
Set escape doors every 80 meters.
The two sides of the completed tunnel are connected by stairs, and the narrow tunnel and stairs are escape routes. After opening to traffic, you will see a red escape door every 80 meters in the tunnel.
name
20 13 Nanjing Geographical Names Office drew up five names and publicized them on the Internet. These five names are: Nanjing Qianzhou Yangtze River Tunnel, Nanjing Yangtze River Tunnel, Nanjing Dinghuaimen Yangtze River Tunnel, Jinling Yangtze River Tunnel and Nanjing Longjiang Pass Yangtze River Tunnel.
After publicity, Nanjing Qianzhou Yangtze River Tunnel, Nanjing Yangtze River Tunnel and Nanjing Dinghuaimen Tunnel are the most popular names, but relevant people believe that Qianzhou is only a geological state and is not suitable for naming. At the same time, he revealed that the Weisan Road Tunnel contains two tunnels, and the Dinghuaimen Tunnel only covers one location, which is not suitable for naming. Therefore, it was finally named "Nanjing Yangtze River Tunnel".
World precedent
Nanjing Weisan Road Crossing River Tunnel is the largest and longest river crossing tunnel in the world. Among the large-diameter shield tunnels, it is the deepest buried tunnel in the world.
Compared with the completed Weiqi Road Yangtze River Tunnel, the geological and hydrological conditions of Weisan Road Tunnel are more complicated. There are soft soil, common clay, sand, gravel and bedrock in the stratum, and its complexity is prone to sudden water inrush and quicksand, which will lead to stratum collapse in serious cases. Especially the cornerstone of the river bottom, its strength is equivalent to four times that of concrete. Therefore, the two shield machines have replaced more than 1000 hobs, each weighing 267 kg.
The penetration of the "double-line" shield tunnel indicates that the domestic large-diameter shield machine independently developed by CCCT has withstood the severe test, which indicates that China has made a major breakthrough in the development of large-caliber and complex technology shield machines, and this market has since broken the foreign monopoly. It is reported that this super-large shield machine independently developed by Zhongmin has gone abroad. At present, 40% of orders come from customers in Japan and Singapore.
Compared with similar foreign tunnel boring machines. Not only can it actively cope with complex geological and hydrological conditions such as sandy pebble, clay, mudstone and sandstone and ultra-high water pressure, but it also pioneered a number of advanced technologies and reached the international leading level.
China's first composite tunnel shield machine with independent intellectual property rights is the largest in China and the most advanced technical product in the world.
Cutter heads are equipped with 7 17 knives, and some shield machine cutterheads with higher number of knives rank first in China.
The excavation distance of the initial cutter head is three times that of the existing tunnel shield machine under similar geological conditions;
Creative setting of push-out hob prolongs the driving distance and is the first in the world;
Driven by the mobile driving part, the cutter head with a total weight of over 1000 tons can be telescopic 100mm, which greatly shortens the tool changing time. This technology is first used in super-large diameter tunnel boring machine.
The special segment lifting and handling system, cutting piece lifting system, mud pipe lifting system and driving cylinder for tunnel boring machine with a diameter of 14m are all the first in China.
The visual camera system of humanoid brake and cutter cutting surface in saturated diving operation has made the first breakthrough in the world. ...
It is reported that Tianhe shield machine has won 5 international pioneering technologies, 9 national invention patents and 9 utility model patents, and thus won the first major equipment and key components in Jiangsu Province in 20 13 and the first prize of Jiangsu Science and Technology Award in 20 14.
1825, Mark brunauer used a rectangular shield machine with a section height of 6.8m to build the first shield tunnel under the Thames in London for the first time. After 190, CCCC excavated a world-class project at the bottom of the Yangtze River with a shield machine with a diameter of14.93m independently developed and manufactured in China. In the world, machine building is creating miracles every day. China's heavy weapon "Tianhe" adds a new "Ding" to the domestic super-large shield machine family.
Construction significance
As the Yangtze River Tunnel is closest to the Nanjing Yangtze River Bridge, it will play a positive role in alleviating the traffic pressure of the Yangtze River Bridge that is overloaded all day.
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