There are many underground engineering construction methods, which are roughly divided into 'open excavation method' and 'dark excavation method'.

The cut-and-cover method includes:

Open cut (digging a pit in situ),

Foundation pit support open excavation (similar to house foundation),

Dig the temporary capping (paving steel plate), and then carry out the cover excavation of the operation......

Underground excavation methods include:

1. The scientific name is the mining method and drilling and blasting method of spraying anchor and dark excavation. (Traditional digging holes, building supports, and blasting mountains, such as the Daqingshan River)

2. The prefabricated pipes are floated to the river construction site respectively, and the immersed pipes are installed in the dredged foundation groove one after another. (The small commodity market dug by the Black Tiger is connected to the artificial lake section of Xiangxian County, which was not mentioned above.) ）

3. When laying pipelines or setting up tunnels, in order not to affect the ground houses and other engineering facilities, use jacks to jack the prefabricated pipe sections or box culverts with excavation to push forward, the scientific name is: pipe jacking method. (The most common construction method for obstacles such as street penetration, road penetration, and wall penetration.) ）

4. Caisson method, also known as caisson sinking method. That is, before the excavation of the soil layer, a pre-made section of the six or seven meters long integral well wall is let it sink into the soil locally by its own weight, and then under its cover, it sinks while excavating. Conventional can only sink thirty or forty meters, but through vibration, mud flooding, etc., it can reach about 200 meters. (It's like putting a bucket with the bottom off on flat ground and letting it sink gradually.) ）

5. Shield excavation method, referred to as: shield method. This is a fully mechanized construction method, which is mainly used for the excavation of interval tunnels. The operation mode is as follows: let the shield machinery advance in the formation, prevent the collapse of the tunnel by supporting the surrounding rock through the shield shell and the segment, excavate the soil with a cutting device in front of the excavation at the same time, transport it to the outside of the tunnel through the excavation machinery, press the jacking in the rear by the jack, and assemble the precast concrete segment to form the tunnel structure.

In addition to the 5th type of technology, even if the underground project of the Ice Bear Space Center is not cracked, Tiancheng has already obtained it by completing the data and activating the system technology.

And according to the subway route planned by Tiancheng:

Zaoshi New Town - Nansihu Weixian - Jishi Guyue Hotel - Canal CBD - Xiangxian Xingyuewan Square - Xiangxian Old Town Hub - Xiaohu Town - Xiaoqingshan of Sancha Township - Wenxian County - Donghu Daxingcheng - Liang County - Taishi - Jinxiuchuan.

When the river is built, the city is dug up, and the tunnel is taken in the mountainous area, which is similar to the light rail as a whole, but the carrying capacity and track model belong to the subway nature of the project, and the shield machine is basically not used.

Oh, the EPBM!

The scientific name of the shield machine should be called the shield tunnel boring machine, which is used for the construction of soft soil tunnels, including the construction of subways, underground drainage, underground cables, gas pipelines, etc.

However, it is not the only machine for shield construction, there is also a TBM, the scientific name is full-section hard rock tunnel boring machine, which has better performance.

However, no matter how different the two are, and how diverse they are, the whole is like a horizontal cylinder.

The main parts are divided into:

The front end is the cutterhead, which is electrically driven and rotates for excavation.

The rear part is a spoon bucket, which is connected to the conveyor belt and is used to transport the muck.

Then there is the soft rock support machinery, which can spray, pour concrete, or assemble prefabricated blocks, which are mechanically constructed into channels that resemble drainage pipes in the ground.

At the end, in addition to the conveyor belt that transports the muck, there is also a jack that is responsible for propulsion.

For the people of this era, the shield machine is a very tall mechanical structure product, and only Germany, Wajima, and North America can independently design and manufacture it.

If you want to use it, you must also have a very deep understanding of geology, civil engineering, machinery, mechanics, hydraulics, electrical, control, surveying and other disciplines.

It stands to reason that Huaxia is an infrastructure powerhouse and it is impossible not to build a shield machine.

However, intellectual property at the international level is a very complex thing.

If you want to build, you must either acquire a company with the core technology of the shield machine, or make a new shield machine that is different from overseas, or you will have to pay royalties......

In the future, the German shield machine will be about 50 million red banknotes, the Nissan shield machine will be about 30 million, and the Huaxia shield machine will only need 20 million.

Therefore, even if he can't use this thing for the time being, Ge Xiaotian still asked Da Mao to buy a slightly more expensive and slightly more advanced hybrid shield machine nearby for all-round dismantling research.

We dare to engage in lithography machines that are tens of thousands of times more difficult than making 'peace', not to mention the construction machinery that will definitely be used in our main business in the future?

And most importantly......

It's the millennium.

Only four cities in Beijing, Shanghai, Guangzhou, and Taiwan have built subways, and all projects belong to the Railway Bureau, and there is no subway contracting qualification.

In addition, there is no limit on the number of cities, or China has not yet set a threshold of 10 billion yuan in urban budget, 3 million in urban areas, 7 million in total urban population, 100 billion in regional GDP, and 30,000 passengers per hour. (03 years)

If during this period, Tiancheng put out GIS white coats, drone models, self-produced shield machines, rail tunnel traffic design and research institutes, and then learn from the Railway Bureau to have a big competition in on-site construction......

High-end, bluffing, fast, the subway construction is almost done.

After a few years, Huaxia issued a qualification certification, and it is estimated that Tiancheng can directly have the highest level.

As for project approval......

Ge Xiaotian went to the Xiangxian hub and saw the second-hand shield machine with a diameter of 6.8 meters, a length of about 65 meters, and a weight of 160 tons, which had been renovated with the help of Wadao enterprises......

..................

Jifu compound.

Handing over the eastern route of the South-to-North Water Diversion Project to Tiancheng is much easier for Yu Zong.

The original budget was 10 billion, but now it only needs to pay 5 billion yuan for the project, and the remaining money is enough to help the city tide over the difficulties.

What's the difficulty?

Tiancheng ran too fast, and in order to keep up, Shao Baitou repeatedly applied for loans and prepared to build a township road project connecting the center of Limin activities.

Borrowing from the sky?

Yi Ge xx's mind and wrist, dare to borrow less white heads?

Maybe that kid is staring at a certain area of Jishi, waiting to play hooligan!

You must know that the local government cannot borrow from the bank, and if you have no money, you can only find your superiors.

To supplement the finances from Tianrong, it is necessary to achieve the purpose of financial financing by transferring land, projects, and fixed assets.

In case when it comes time to repay the loan, the kid doesn't want any money, just the 'collateral'......

With the multiple relationships between the two sides, Shao Baitou will definitely not come back.

But......

Mr. Yu frowned and thought for a while.

At the beginning, in order to get Daqingshan, Xiang County threw out the Xiaohu Town Coal Mine.

In order to take Liang County, Jishi threw out a mountain range in the northeast.

Yankuang does not belong to Yancheng and is self-contained.

Ge XX was not interested in Confucius.

The East Lake is already big enough, Tiancheng can no longer ask for Nansi Lake, and has the right to manage the canal, and Tiancheng will not ask for it from Jishi.

There is Dongshan Jianlian in the urban area, which does not conform to the Tiancheng system......

In other counties, Tiancheng has projects......

Counting around, there shouldn't be any good places in Jishi.

If a piece of wasteland is sold to Tianrong in exchange for billions of funds, even if Ge Lao Er is a hooligan, the construction should still be built, and it seems that there is no loss in Shaobaitou......

Moreover, the excess money for the management of the canal belongs to special funds, even if he is the leader of Dongshan, he is afraid that someone will take the opportunity to find fault......

Mr. Yu thought about it and dialed the phone number of the Jishi office, "Why don't you try Tianrong?"

"Leader, when Ge Xiaotian proposed this, I felt that I was being targeted......"

"Try it first, borrow a billion first, if the thing they ask for is not very important, agree to it, and then continue to lend. ”

"Okay......"

Putting down the phone, Mr. Yu thought about it again and again, and felt that there should be no problem.

.....................

Splendid River.

As soon as Ge Xiaotian landed, he received a call from Tianrong.

Less whiteheads to 'borrow'!

Of course, he knew that the localities could not borrow money from banks, let alone private financial institutions, and could only exchange funds by way of selling them.

Fortunately, it was a step slower, if I would go to Jifu to talk to Lao Yu about the subway, I had been preparing for a long time, and I was going to fool Shao Baitou about the 'loan', I am afraid that it would be in vain. ’

Ge Xiaotian looked left and right, found a corner and squatted, took out the subway plan from the document bag, and instructed Tianrong supervisor, "Give me all the 2,000 acres of land around each subway entrance." One billion is not enough, just two billion, including Taishi, by the way, no need to raise funds in the sky, use my money. Be sharp, finish it all today as soon as possible, and it doesn't matter if you lose something. ”

"It's all wilderness and no one wants it, and some of them are deviating from our existing projects, I'm afraid that the young white-headed leaders will be happy......"

"It's better to be happy, it's slippery, including the land in Tai City, call me after you finish processing. ”

"Okay!"

As soon as the subway was passed, land prices skyrocketed.

If Jishi pays for the subway repair, Ge Xiaotian will have nothing to do.

But Tiancheng pays for the construction of the subway, and he must reap the benefits in advance, otherwise wouldn't it show that he is stupid?

The city doesn't agree?

Well, I'll smash these tens of billions of projects in other places, Zao City, Heshi City, Tai City, bypassing Ji City......

Of course, Tiancheng and Jishi belong to a community of interests, and after Shao Baitou knows the truth, he will only be very entangled, and will not be angry......

...............

It was originally very complicated to take the land, but it involved the transfer, and the city was really short of money, so Tiancheng agreed to it happily......

It was done very quickly.

It's just that I saw that the average price of Tiancheng's land was either 100,000 yuan/mu or 200,000 yuan/mu, all of which deviated from Tiancheng's industrial chain......

In addition, the textile factory dormitory on the west side of Guyuedian in the urban area is famous for its dirty and messy business, and Jishi gives a high price of 500,000 yuan/mu, and Tiancheng readily agrees......

If something goes wrong, there must be a demon!

The next day.

The newly appointed leader of the Resources Bureau, who replaced the Sun Bureau, took a leave of absence.

Day 3.

The young white-headed leader who went out in person also became more and more weak-hearted, and couldn't help but call Mr. Yu, "Leader, is there any news from above?"

"What's wrong?"

"What Ge Xiaotian bought is all in the wilderness, and there is no development value at all. ”

"I guess it's going to build a factory, no, it's a ...... to build a factory and lease land."

"Yes, the nature of the two plots is different, and the transfer contract is almost all commercial land, comprehensive land, residential land, ......"

"Strange!"

While the two were puzzled, the secretary stepped forward and handed over a note.

Ge Xiaotian visited. ’

"Huh?" Mr. Yu suddenly had a bad thought in his heart, this kid seemed to take the initiative to come to the Jifu compound for the first time!

"Leader, I'm here to repair the subway for you!"

Before he could signal the secretary to bring the kid in, there was a sound of underbeating downstairs......

"Subway?

"Didn't you say that I have the ability to repair the subway for you?"

Stepping into the office, Ge Xiaotian put the photos and documents on the desk, "I first spent 50 million yuan to buy this world's most advanced shield machine." Another 200 million yuan was spent to invest in a super-large cement plant to produce prefabricated parts in advance. Then invest 500 million, relying on the GLONASS system with an investment of 400 million, to build a GIS platform to explore geology and landforms along the way. Now we have also invited the Washima Shinkansen technical team and the North American subway technical team to ......"

Mr. Yu was stunned, "When did I say that I wanted you to repair the subway for me?"

"When the graphene storm is over, I called you, you seem to be on a business trip, I said to engage in Daqingshan, you said that I have the ability to engage in the subway......"

“？？？”

"The leader's words, I must have taken it to heart, for more than a month, I have been thinking about this all day long...... Leader, the plan worth 50 million has been done, if you don't fix it, I'm afraid I'm going to die!"

“？？？”

The young white head on the other end of the phone was silent for a long time, "Leader, you seem to have said that you ...... repairing the subway."

“？？？”

Who are you with?!

(End of chapter)