90th vote. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

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Tan Xueheng explained.

The reason why the Ganyue Canal can be built is because the Ganjiang River water system and the Pearl River water system are the closest distance on both sides of the Meishan watershed, only about ten kilometers, and the watershed is not high, only more than 200 meters, digging a canal of more than ten kilometers, it will not be difficult for China to come, the people who built the Beijing-Hangzhou Grand Canal more than 1,000 years ago are not worth mentioning to engage in this kind of small project.

But communicating with the water system does not mean that there will be water loss, because the two water systems are still basically not connected.

The whole canal is lifted by cascades, and the water level of a section is kept stable through a level of sluices.

Thirty-two large sluices were built from the lower reaches of the Gan River to the watershed, and a large reservoir was built on each side of the watershed, connecting the two reservoirs with a channel over the mountain, but the channel was high above and confined by the sluices.

The boats from Jiangxi went upriver from the upper level of the Ganjiang River, entered the channel sluice, crossed the watershed, and entered the reservoir on the Guangdong side, so as to realize the interconnection of water transportation.

But in this process, the water consumed is just the water in the canal, the canal is as high as 200 meters, and the fool knows that the water cannot go upstream, and the water from the reservoir must be continuously pumped into the canal, and the waters of the Ganjiang River and the Pearl River on both sides have built reservoirs, and the water of the reservoir can be adjusted by itself, which is controlled by man, how can the water of the Ganjiang River be lost?

After Tan Xueheng's professional explanation, Yang Chao didn't understand it, but he didn't worry if he understood that it was controlled.

After the canal is completed, 1,000-ton ships can go directly from the Yangtze River to the Pearl River, and goods from the hinterland of Jiangxi can go directly to the sea from Guangdong, saving thousands of miles compared with passing through the Yangtze River, and this cost will be reduced by at least half. There is no saying about the role of promoting Jiangxi's economy.

Moreover, the river transportation is relatively gentle, and it can be grouped by tugboats, and it is not a problem to pull a tugboat of 10,000 tons, just like a train, and the locomotive pulls the carriage. Pull as much as you want.

After standing on the hill for half an hour, I saw with my own eyes the first three-group towing boat entered the locks, which closed and sailed into the canal. After entering the sluice, driving into the reservoir below, and then into the Pearl River basin, Yang Chao finished his inspection.

I went to Guangdong and sat down, and immediately flew to Shandong.

For Yang Chao. The Ganyue Canal is only a small project, with an investment of less than 10 million, plus the overall construction of more than a dozen navigable rivers in the Ganjiang River basin of Jiangxi in the later period, and the waterway investment will not exceed 50 million taels of silver, less than 100 million gold yuan.

However, the Ganyue Canal is the first large-scale project of the National Reconstruction and Development Office, so Yang Chao must see it with his own eyes, and it is Yang Chao who cares most about larger projects and more difficult projects. For example, the Bohai Tunnel.

When I arrived in Shandong, I went directly to the Bohai Tunnel project site, and the biggest difficulty encountered in the construction of the Bohai Tunnel presided over by Mao Yisheng was the speed problem.

The technical problems have been solved long ago, because as early as five years ago, when the Yangzi laboratory was established, the project was approved, and in the next five years, Mao Yisheng led the team to solve one engineering problem after another. Experiments and measurements cost more than 3 million yuan just for preliminary preparation.

It is worth mentioning that this tunnel will be fully equipped with Chinese technology. Like the Yanji Railway in those years, it is a tunnel for gas contention, and it is a super project that can boost the morale of the people.

Mao Yisheng briefly introduced some of their design plans to Yang Chao, using the immersed tube method. Now the foundation groove is cleared from the seabed, and then the prefabricated reinforced concrete tunnel is slowly sunk into the foundation groove from the sea surface, and all the tunnel docking is completed. The connection is sealed, and the seawater in the tunnel is pumped away, and a tunnel is built.

The basic principle is simple, but it is impossible to construct in such a complex situation as the seabed without encountering problems. Previously, Mao Yisheng did a lot of experiments, determined the structure of the prefabricated tunnel, carried out pressure resistance and corrosion resistance experiments, and even did tests in the Yangtze River section of the capital Nanjing, and built a cross-river tunnel from Nanjing to Pukou on the opposite side.

It can be said that the preparation work and technical reserves are sufficient, but all the technologies are more or less problematic in such a highly complex environment as the sea.

When they were in Nanjing, they cleaned out the foundation groove on the seabed and laid gravel as the foundation, which was very easy, but when they arrived in the sea, they laboriously cleaned out the foundation groove, and after a strong storm they found that the sea sand was filled in again.

When the dozens of kilometers of foundation grooves they spent half a year cleaning up were filled, Mao Yisheng was hit by the first blow, and that time he fell ill directly, sick for half a month, and lost more than a dozen pounds.

Disease, not only because of engineering difficulties, but also because of the pressure, before and after the experiment, it cost more than 3 million taels of silver, and the construction has spent tens of millions in the past year, but the result is a failure, and Yang Chao set the tone very high, what kind of competitive tunnels and the like, while foreign counterparts are constantly sarcastic, calling it the Chinese's Arabian Nights, these situations make Mao Yisheng feel the pressure of Zhan Tianyou again.

So after encountering difficulties, he really couldn't hold on.

Yang Chao came this time, just when Mao Yisheng had just recovered from his illness and started work in a hurry again.

"Rest when it's time to rest. If you're afraid of anything, you can always fix it. The Great Wall, the canal, which national project is not difficult? ”

Yang Chao only comforted, never pressurized.

Mao Yisheng sighed: "But the budget is seriously overrun, I'm afraid 100 million is not enough." ”

100 million is a huge amount of money, but it doesn't seem to be enough now, far from enough.

Yang Chao said with a smile: "Don't be afraid of the high price, Qin Shi Huang built the Great Wall, the Great Wall was erected, the Qin Dynasty fell, Emperor Yang of the Sui Dynasty repaired the canal, the canal was repaired, and the Sui Dynasty repaired it, is this price big?" No matter how big the price is for us, can it be greater than these two people? 100 million is not enough, then 200 million, 200 million is not enough, then 300 million, even if 1 billion, what about 2 billion? ”

Yang Chao said lightly, as if money is not money.

Mao Yisheng said some engineering situation, they have now adjusted the method, no longer according to the past, first clean out all the foundation grooves, and then concentrate on the tunnel immersed pipe, but clean up a little, install a little, which greatly reduces the damage of the tide to the foundation, but also greatly increases the cost.

Because of the need for continuous surveying and mapping to ensure accuracy, it is necessary to continuously lease engineering ships, rather than centralized leasing and intensive construction as planned in the past. At the same time, a large number of workers from different specialties work together, resulting in an unsaturated workload, which greatly increases the cost.

According to Mao Yisheng's re-estimate, it is necessary to lease more than 300 large ships for a long time, plus a large number of self-built engineering ships, and employ 100,000 people for long-term construction, and if the project period is 10 years, the total expenditure will reach 1 billion taels, of which the wage expenditure alone will reach 400 million taels. (To be continued.) )