Great warships

Chapter 237
"The first step is to dredge the cofferdam." Qin Tao said, "Block the outside first to prevent seawater from pouring in."

Qin Tao began to give clear instructions.

To build a dock, of course, there must be a passage to the outside, so that ships can come in and out at will. Now they have only dug the inner space, and have not started on the outside. However, because the height outside is low, there will be some sea water when the tide is high. Pour it in and increase the difficulty.

The first step is to block the outside.

"Yeah, we thought about that too, but if we want to block it, we have to drive piles outside, and the bottom of the river outside is full of alkali slag." Kong Laoer said.

They have tried all kinds of methods, but they just don't work. The difficulty of this construction is too high.

There are many factories in the upper reaches of the river. Over the years, the factories have continuously discharged various wastes, including a large amount of alkali slag, which flows down the river. They expect to build the outside of the dock, all of which are such things. Just like porridge, there is no way to fix the pile at all.

"We also tried to find a way to remove these alkali slags, but just after some of them were removed, the river washed away new alkali slags." Kong Laoer continued.

Qin Tao nodded: "This is a big problem, so we have to break the routine. Since digging is not possible, then we will fill in and throw a lot of stones into the bottom of the water to play a fixed role, and then we will drive piles!"

Qin Tao's thinking was completely in the opposite direction. This proposal made Kong Laoer's eyes shine: "You are right, let's try it now!"

Kong Laoer did what he said, and immediately mobilized the convoy to transport the stones. Soon, the truckloads of stones were thrown to the bottom of the water. Since the alkali slag could not be removed, they pressed stones on top!
Boom, boom, boom!
The sound of pile driving came and went.

New Year's Day has passed, and the time has entered 92 years, and the workers are working in full swing.

One pile after another was driven into the bottom of the river, and steel plates were fixed behind the piles to form a curtain. In this way, the outside of the dock was finally blocked.

"Boss Qin, your project is too huge!" Zhang Wenlong, a geologist, was invited. Looking at the steel sheet piles driven in outside, it was like building the Great Wall. Zhang Wenlong couldn't help but feel emotional.

Several large water pumps are constantly pumping water out.However, this didn't seem to have any effect, because while they were pumping water, water was coming up from below, and the water inside seemed to never be drained!
If this continues, it will be an endless loop!
Zhang Wenlong frowned and said to Qin Tao: "The geological conditions here are too complicated. Below your dock is a special limestone corrosion zone, the most typical karst landform. The bottom is criss-crossed, with ups and downs, caves are everywhere, and there are a lot of caves. gravel layers of fissure water and confined water."

As a geological expert, Zhang Wenlong has also surveyed many dock landforms, none of which are as complicated as this one.

Hearing what the geological expert said, Kong Lao Er frowned: "Boss Qin, let's..."

"If our shipyard wants to develop, we must have a large dock." Qin Tao said: "This is the landform here. Let's dig in another place, and it will be the same. Unless we move the entire Mingzhou Shipyard Walk."

Move the shipyard?That is of course not possible. Many people are locals, so it is not easy to move away. Besides, even if they move away, the huge infrastructure project here will be for nothing, and the loss in the factory will be huge.

Moreover, moving to a new place will still face a series of problems.

"Boss Qin, just tell me what to do!" Kong Laoer's eyes showed firmness.

"The next step is to block all these places where the water is coming out." Qin Tao said: "Let's do it little by little, and if there is a hole, we will plug a hole! Let's pump water and construct at the same time! I believe that man can conquer nature!"

Zhang Wenlong shook his head, difficult, too difficult!
However, he soon became shocked. The workers here are too tenacious and resolute. Their bodies flashed the spirit of the iron man Wang Jinxi back then!

In the gushing water, they wore the water pants used by fishermen and got into the water. They looked for leaks one by one, and then poured in cement mortar, which was washed up by the water pressure. In this way, the leak was finally blocked by them!

One hole, two holes, three holes...

As more and more holes were blocked, the pumping speed of the water pump finally exceeded the speed of spraying water, and the water on the construction surface began to go down!

Zhang Wenlong was very emotional, and at the same time actively participated in it.

"This place belongs to the gravel layer, and it should be solved with the curtain of unity!"

"Here we should continue to dig down, all the way to the surface of the rock formation!"

Different places have different construction methods. As a geological expert, Zhang Wenlong has provided a lot of professional advice. He no longer doubts it. What he has to do is to work with everyone and brainstorm together. He also began to believe it. Man can conquer nature!
Soft foundation piles, high-pressure spraying, curtain grouting... All kinds of methods were proposed by him. These professional geological treatment methods were used on this, and they began to become more comfortable.

The large shipyard has finally been dug out!
Standing outside the dock, especially on the high gantry crane, the scene below is very spectacular. This large dock, which is nearly 400 meters in length and 100 meters in width, is definitely the first dock in China!If it is planning a basketball court, it can accommodate nearly a hundred basketball courts!
"It's so big!" Qin Baoshan couldn't help but sigh when he looked at the extra-large dock.

Although he is the director of the shipyard, Qin Baoshan's presence is already very low. Now he is still in charge of the construction of the Siamese aircraft carrier, but he still finds time every day to come here to watch the excitement.

The 40-ton dock is probably the largest in China, right?With this dock, they can build and repair hundreds of thousands of tons of ships. In China, this dock should be the largest.

Thinking about how their shipyard almost went bankrupt in the past, and now that it is about to develop into a large shipyard, Qin Baoshan is filled with emotion.

"Old man, don't worry, this is just the beginning." Qin Tao said.

The dock was only dug out, and then a large number of steel bars had to be used to weave the frame, and then the main body was cast.

"It's spraying water!" At this moment, suddenly, water came out of a place.

Several workers nearby saw it and rushed over immediately. The situation was urgent. The first worker who rushed over immediately lay down on his stomach and blocked the water spraying place with his chest!

Although this is the south, it is still the twelfth lunar month after all, and the water sprayed out is extremely cold, and soon the worker's face turned purple.

Other people were also busy, removing the nearby valuable equipment, and some people brought mortar specially used for plugging leaks and began to water the leaks.

Soon, the leak was plugged.

The worker who was the first to rush forward was soaked and trembling, and someone handed him a wine bottle.

"Come on, have a drink first, to keep you warm."

Without hesitation, he picked up the wine bottle, took a few swigs, and then put a warm coat on him.

Only at this time did he feel that something was wrong, and when he turned his head, it was Mr. Qin!
"Boss Qin, I can't wear your coat, I'm too dirty." The worker said quickly.

"No, if you don't hurry up to keep warm, you'll get sick from the cold. I'll give you this coat!"

Although Qin Tao did not give a cash reward on the spot, his overcoat was worth several hundred yuan. The workers were wearing warm overcoats, with tears rolling in their eyes.

This is President Qin!Never treat workers badly, so everyone is willing to work for Mr. Qin!Even if it is risky!

"The Chinese New Year is coming soon." Qin Tao looked at the busy workers around and said loudly, "This year, all the workers in our factory will get a year-end bonus of 2000 yuan!"

"Long live!" In an instant, everyone cheered.

The year-end bonus of 2000 yuan is definitely not a low fortune. Everyone is very excited. This year-end bonus is equivalent to the annual salary of some poorly managed factories. I will definitely be able to get paid, as a worker in the Mingzhou Shipbuilding Industry Group, the salary is absolutely nothing to say!
"This year is very special. The construction of our dock cannot be stopped. Therefore, this year, everyone needs to live on the construction site. However, three days off for Chinese New Year, triple the salary!"

"Long live!" The crowd cheered again.

For them, Chinese New Year and New Year are the same. The construction site is so tense and there is no time to rest. Originally, they planned to work overtime. Now, they are paid three times the salary for overtime work, which is even more exciting.

These news spread quickly, so, not long after, other people came running over.

"Mr. Qin, the contract for our second natural gas ship is also very tight. Our workers said that they also hope to work overtime." Cong Ju and Qin Tao have a good relationship, so they first spoke on behalf of the workers.

The first natural gas ship has been delivered, and after operation, it performed well, so the next order came naturally, with the same model, as long as you continue to follow the previous ship, but the construction period is very fast.

"Of course." Qin Tao said, "Let the workers work hard."

"President Qin, the construction of our 051C destroyer..." Zhou Yongfei also followed.

"The construction of warships cannot be delayed."

"Boss Qin, the boys in our design department are also very motivated." Yang Dawei came over.

Qin Tao glanced at Yang Dawei: "Hey, is this three times the salary so attractive? Everyone should have a backbone, and don't work overtime. You have to go home to spend the New Year with your relatives!"

"Boss Qin, everyone's enthusiasm is very high. Moreover, most of the people in our design department come from all over the world. It's hard to buy a ticket to go home during the Chinese New Year."

In this era, it is too difficult to buy a ticket to go back during the Chinese New Year.

Qin Tao nodded.

"So, the big guys are holding back their energy, save some money, buy a car, and it will be convenient to go home."

Qin Tao instantly understood that everyone has ideals!
"That's right, I'm a man who is full and doesn't know how hungry a man is. Our shipyard has developed very well, and the housing problems of the big guys have been solved. In the future, it is time to solve the problem of travel." Qin Tao said: "Everyone wants to have Private car, these are not difficult, I will go to Lao Maozi's place later, get some cheap cars and come back!"

Qin Tao is very handsome, holding a big mobile phone in his hand, driving a Mercedes-Benz big G, an absolute successful person, but he can't enjoy it alone, other people in the factory also have this kind of demand, especially those whose families are out of town.

In this day and age, it is very beautiful to be able to drive a car home!
"The big guys can work in the factory, and the factory is their home, which is good." Qin Tao praised a few more words: "The factory will never treat the big guys badly."

"Taozi, did you forget something?" Cong Ju suddenly changed the subject. When reporting on work, Cong Ju politely called Mr. Qin, but now he is called Taozi, which is obviously a private matter.

Qin Tao reacted instantly: "That's right, the New Year is coming soon, I have to bring my wife back for the New Year!"

Although all the workers in the shipyard are planning to work here, Qin Tao is not so selfless, he is married!His wife works in Huating, this is the first Spring Festival after marriage, of course he has to spend it at his home!

When Qin Tao left Huating back then, Qin Tao originally planned to only have a few days. As a result, he directed the construction here and kept thinking of various methods. Before he knew it, it was the end of the year!

Fortunately, the basic problem has been solved now, and only the casting dock is left. Even if there are occasional places where water leaks, the workers on site can handle it, so he doesn't have to worry about it.

Taking advantage of this opportunity, quickly bring my wife back for the new year!

After Qin Tao directed the work of the shipyard, he drove his own Mercedes-Benz G and drove quickly to Huating.

How long has passed?Is it exactly one month?If so, wouldn't he be a monk again?

Just after entering the urban area of ​​Huating, Qin Tao's mobile phone rang again.

"Hey, is the CNC machine tool safe? Okay, I'll go there right away!" Qin Tao forgot about picking up his wife and drove towards the factory in Huating.

The water jet propulsion factory has officially changed its name to Mingzhou Shipbuilding Industry Group Propeller Factory. These people are always so uncreative when they come up with names, and I think they will have to change them in the future!Qin Tao's car drove through the gate and went straight to the workshop where the CNC machine tools were located.

"President Qin, the machine tool has been installed and debugged, and it can be put into production at any time." Zhao Changshui said to Qin Tao excitedly: "The information stored in it has been sent to the relevant departments of the Navy for research, waiting for their decision."

If they want to produce brand new propellers for the Navy's nuclear submarines, they must have propeller design drawings, and the Navy must go through comparisons to determine which one to choose.

They had to wait for a while before making a decision, but the blank of the propeller had already been placed in place.

At the very beginning, ships were made of wood, and the propellers were also made of wood. It was not until 1831 that cast iron propellers were used for the first time in the world. Although they had high strength, they were easy to rust, and then there were cast steel propellers. The propeller, still can't get rid of the rust.

So soon, propellers began to be made of brass. In seawater, copper is more resistant to corrosion than iron, and has higher resistance to erosion, so it once became the mainstream.

But as the ships got bigger and bigger, this simple brass propeller gradually showed its disadvantages.

As propellers get larger and larger, the brass material exposes weaknesses in tensile strength and corrosion fatigue resistance.In order to increase the corrosion resistance of seawater, the brass propeller had to be made thicker and thicker, resulting in larger and larger volume and weight, resulting in increased power loss, dragging down the maneuverability of the warship, and aggravating the wear of the transmission bearing, further reducing the service life.

At the same time, as the speed of the propeller becomes faster and faster, the cavitation effect on the surface of the propeller also increases sharply. The brass material is weak in dealing with cavitation corrosion, and is prone to irreversible dezincification, which leads to the strength of the propeller. The rapid drop, and even the phenomenon of cracking and breaking on the surface.

Therefore, warship propellers also need continuous innovation. In 1876, the material Cigar Bassen created a manganese bronze material as a propeller.An alloy obtained by adding manganese, aluminum, iron, tin and other components to bronze greatly improves the performance of the propeller.

As a result, other scientists followed suit, looking for different formulas to obtain suitable materials, and finally obtained the nickel-aluminum-bronze alloy.

Although this thing is not well known, but if you make a comparison, the significance of this nickel-aluminum bronze propeller is equivalent to the use of nuclear power on warships.

The unit weight of this alloy is only 90.00% of that of brass, but the cavitation corrosion resistance is three times that of brass, and the dezincification phenomenon in highly corrosive seawater is less than half of that of brass. In terms of work fatigue strength It has reached twice that of brass, which means that the lifespan has been greatly increased.

Specifically, the propeller made of nickel-aluminum bronze, on the premise that the service life and propulsion efficiency are twice as high as the brass propeller, the thickness is reduced by nearly 15.00%, the weight is reduced by [-]%, and the performance is directly doubled!
Up to now, advanced propellers still use this material, but the specific material ratio and craftsmanship have been continuously improved. Of course, all countries keep their own materials secret.

Now, the blank in front of me is a domestic material. When casting the blank, it is directly cast into the general shape of a seven-bladed propeller, which saves the need for basic cutting.

If it is a whole billet, the CNC machine tool must first cut out a rough shape, which will waste a lot of time and unnecessary loss. After all, the advantage of the CNC machine tool lies in finishing.

The alloy material is yellow, but it also glows with some white light, which looks very dazzling.

Just as Qin Tao was listening to the excited answers from the people around him, a burst of hasty steps came in.

"Mr. Zhang?" Qin Tao was very surprised. Why did the chief designer of the nuclear submarine come here?
"We have already completed the comparison, and decided to use the propeller of the Type 971 submarine for the first attempt." Mr. Zhang said, "I happened to pass by here and bring you the news. Let's take a look."

The Type 971 nuclear submarine is the third-generation nuclear submarine launched by Lao Maozi in the 80s. During the research and development, it was decided to use a seven-bladed large skewed propeller, and the specific effect was also very good.

In terms of displacement, the displacement of the Type 971 nuclear submarine is two to three thousand tons larger than that of the domestic 091 nuclear submarine. Therefore, if it is not possible to apply it directly, it needs to be scaled down. However, due to the completeness of various data, just simply It can be realized by modifying the program.

"Okay, now that it's settled, let's revise the program and start a trial production." After Qin Tao finished speaking, he looked at the silent foreign engineer: "Polustat, it's up to you!"

Polustat nodded, and tapped the keyboard on the control computer beside him.

"Is it all right so soon?" Seeing that Polustat had finished it in a few clicks, everyone was a little curious.

"Yes, if it is scaled down, you only need to change a few parameters."

"Then let's get started!"

As the order was issued, the huge machine started to rotate, and the milling head on the mechanical arm began to move flexibly under the control, and the metal wires were cut off one by one. Seeing this machine tool in operation, everyone's heart was filled with excitement. There is a feeling.

A new era has arrived. Domestic production of propellers no longer requires manual labor. The addition of this multi-axis CNC milling machine has brought domestic propeller processing to a new level!
"The processing will take at least half a month, Mr. Zhang, you won't keep watching, will you?" Qin Tao said to Mr. Zhang.

"Well, no, I'm just here to watch the excitement." After Mr. Zhang finished speaking, he turned his eyes back from the machine and looked at Qin Tao: "Mr. Qin, I still have some things, can we talk about it?"

"Of course, let's go to the office."

Sure enough, Mr. Zhang came here not just to see the processing of the propeller, he had more important things to do.

"We have already studied the subsystems of the two 705 submarines, and many of them have reference value. Some things we are imitating, and some things cannot be imitated temporarily." Zhang Lao said: "For example Let’s say, we don’t know how to process the cylindrical sonar at the bow of the boat.”

Electromagnetic waves cannot be used underwater, so listening to sound is the most important way.

China is quite backward in this respect. Looking at the domestic 033 submarine, there is only a bulge on the upper end of the bow, and the sonar is installed in it. It is small in size and poor in performance, and it is almost useless.

Over the past few years, the development of foreign sonar has also been rapid. The mainstream sonar occupies almost half of the submarine's bow space, and some are even larger.

Although Qin Tao had never seen the sonar on a nuclear submarine, he thought it would not change much.

Now, after dismantling the Type 705 submarine and seeing the advanced technology on sonar, they are very tempted. However, when imitating it, they encountered a big problem. They don't even know how this thing is made!

Qin Tao nodded: "It seems that we need relevant technicians from Lao Maozi. I will figure out a way! However, the cylindrical sonar on the 705 is also outdated. The advanced sonar is spherical. We may still use it. Being able to overtake another car on a curve, to make a breakthrough.”

(End of this chapter)