Li Miller stayed in China for a while, because Yang Chao invited her to attend the opening ceremony of the Bohai Bay Tunnel, which she was also interested in. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ

After more than two years of construction, the main body of the tunnel was completed at the end of 34, and then it took two months to cap the tunnel, in fact, on top of the prefabricated tunnel, first spread a thick layer of fine clay, and then covered with gravel and fine sand, with this triple soil like the top can prevent leakage, until the foundation groove is filled, consistent with the seabed, so that it will not be affected by the tide.

After that, a large pumping machine was used to pump water at both ends, and it took three months to drain the seawater.

At this time, the main body of the tunnel is completed, and the next step of construction can be carried out, and the next step of construction is actually to lay a double-track rail in the tunnel, and it is a load-bearing rail, with a weight of 75 kilograms per meter of rail, which is now the highest specification of the heavy rail, ensuring that the annual traffic capacity of this double-track track can reach 100 million tons.

As for the car passage is not considered at all, passengers and goods are given priority to the train, of course, if necessary, you can also open a car-carrying tablet, drive the car to the flatbed train and fix it, and the train will bring it over, and people don't even need to get off the car.

35 years of follow-up construction throughout the year, at the end of the year basically completed the track laying, and then inspection tests, post-processing, until March 36, the final construction was completed, in which the lighting facilities, ventilation equipment, etc., and passed the test, reached the opening conditions.

"It's a miracle of engineering!"

Yang Chao introduced Li Miller in an admiring tone.

Yang Chao did not have a celebration, tailoring is the president's job, he didn't want to steal the limelight, but on the first train with red silk, there would definitely be a seat for Yang Chao, and it was a private room.

Li Miller couldn't care about Yang Chao, holding a camera through the window, and kept taking pictures.

She has already learned about this project, which is indeed an engineering miracle, not only because this is the world's first undersea tunnel, a 123-kilometer-long tunnel, but also because this project, the Chinese only took less than 5 years, and the public opinion of the international engineering community is that they cannot build it in a hundred years.

The train quickly passed through the tunnel, all the way is very smooth, because this kind of engineering, will not save money on the track laying at all, using the best international technology, Germany has just developed the ballastless track technology, that is, the whole tunnel has no ballast, all with reinforced concrete overall foundation, the track is laid on this almost one-piece poured reinforced concrete foundation, not only the strength is strong enough, and the vibration is also greatly reduced, in fact, the ballastless track is developed by Siemens for high-speed railway, so this tunnel actually has the potential of high-speed railway, In the future, it is expected to operate at a speed of more than 120 kilometers per hour, and the ideal speed is 150 kilometers per hour.

The reason why it is not yet up to the point is not the problem of the rails, but the problem lies in the traction power, and Siemens has not yet solved the problem of stable contact between the pantograph and the high-voltage line at high speed, and the speed exceeds 150 kilometers per hour, and it is possible to fall off the bow.

Even so, it only took an hour and a half to get from Yantai to Dalian.

In Dalian, there is also a lively celebration party, and there is also a special guest, North Korean Prime Minister Kim Koo.

Jin Jiu has been looking forward to this tunnel for a long time, but it can be opened to traffic so quickly, which really makes him ecstatic.

As early as the middle of last year, the longitudinal line of the DPRK had already traveled from the port of Busan in the south to the Korean Peninsula, connecting Seoul, Pyongyang and other major cities, and finally arrived at Dalian.

The original railway in North Korea was built by the Japanese, and the Japanese railway system was narrow gauge, and the rule was 1 meter, but at the beginning of the construction of the railway, the Japanese chose the meter gauge out of cost considerations, and as a result, until now, the speed of the Japanese railway is difficult to exceed the speed of 40 kilometers per hour.

Later, Japan built the Shinkansen, and chose the standard rule of 1.4 meters, in fact, it is not necessarily that the meter gauge can not achieve high speed, but because this is not a standard track, no one wants to develop on the basis of this track, the Japanese Shinkansen uses the German ballastless track, the Italian tilting train, the French power, etc., all of which are the technology developed by the Europeans, and the Japanese have integrated, and these new technologies are all developed based on the standard track, which cannot be used on the narrow gauge or on the broad gauge.

Therefore, the North Koreans also chose the standard gauge to build the railway, and after the road was built, the narrow gauge built by the Japanese would be changed, so that the Korean railways would become a uniform standard, and only the railways transporting timber in the deep mountains would maintain the narrow gauge.

In the past two years, through the introduction of investment from China, the DPRK's economy has developed rapidly, and the urbanization rate has been greatly increased, and although China's investment has made profits, it has led to the development of DPRK capital, and the introduction of 100 million Chinese capital can bring 300 million DPRK capital, which is the biggest benefit of attracting investment to develop the economy.

The rapid development of the economy not only did not make Jin Jiu complacent, but made him feel more urgent, because he saw a good opportunity to catch up with Japan, not to take advantage of the big crisis to overtake Japan, and then want to surpass in the future, it will not be so easy, Jin Jiu knows very well that the accumulation of the Japanese is far from being comparable to North Korea, and 60 years have passed since the Meiji Restoration, and the accumulated technology, capital and knowledge are far from being comparable to North Korea, which has just been established for less than 20 years.

Therefore, Jin Jiu is not satisfied, he hopes to hurry, and then hurry.

However, transportation is the biggest constraint, although it is connected with China's sea routes, and the goods are convenient, but the personnel exchange is too slow, take the train around the Bohai Bay, more than 2,000 kilometers farther than across the sea, after the Bohai Tunnel is built, it will be reduced by at least 1,200 kilometers, greatly reducing the time from China, especially Shandong to North Korea, which will make it more convenient for more Chinese capitalists to travel to and from the Korean Peninsula, and will make them more willing to invest in North Korea.

Therefore, after the tunnel is built, Jin Jiu is going to participate, and he must participate.

But the Bohai Tunnel is not for the North Koreans, mainly to facilitate China's domestic transportation, to be precise, is to communicate the Northeast and Shandong, both are China's economically developed economic regions, although in recent years by Shanghai surpassed, and Guangdong only caught up, but the Northeast, or over Jiangsu and Zhejiang, is located in the second position of China's heavy industry, second only to Shandong.

Therefore, the Northeast dignitaries waited in Dalian to welcome the first train taken by Mi Qing and Yang Chao to witness this new era. (To be continued.) )