I! Pretending to Be Reborn, Director of Doomsday Hoax

Although now, the Dragon Kingdom does not need to consider the cost of building a dungeon at all,

However, the more serious and terrifying problem is that changing the blades repeatedly will greatly slow down the progress of the project!

Because the tool change is not possible under any conditions, it must be implemented under the condition of precipitation.

However, in water-rich sand and pebble formations, there are not many precipitation conditions, so it is difficult to choose a tool change location.

Sometimes, you even have to wait days or weeks for a chance to change the tool! !

This is simply impossible to tolerate for the upcoming doomsday and the tight construction period of the dungeon.

Zou Botao rubbed his head. For the construction of this dungeon, as a physicist, he has mastered a lot of mechanical engineering knowledge abruptly.

Now, he is about to become a sophisticated engineering robot.

"Director Xu, we actually have another way." Zou Botao said in a deep voice.

Xu Qiu was thinking all the time, and when he heard this sentence, he looked over.

"any solution? "

Zou Baitao said: "The water-rich sand and pebble strata have plagued the world's subway industry for decades because the tunnels are basically straight. Even if there is a certain degree of curvature, the degree of curvature was very small back then."

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"That is to say, if it is a tunnel such as a subway, it is impossible to bypass the water-rich sand and pebble formation."

"However, what we are building is an underground city."

"And these tunnels of ours are not used to operate trains such as subways, but are designed as load-bearing structures for dungeons!"

"Therefore, we can completely avoid the water-rich sand and pebble formation. After reaching the water-rich sand and pebble formation, we dig down suddenly, digging ten meters or 20 meters deep, and we can always find the stop point of the water-rich sand and pebble formation!" Everyone's eyes lit up.

This way!

Really wonderful! !

They were a little surprised and delighted with Zou Botao's idea.

Most of them are old experts in Longguo subway, tunnel and other projects, so they have not been able to jump out of their original thinking.

I just want to build a long, straight and stable tunnel.

But I forgot that the function of this tunnel is not for transportation, but as a load-bearing structure for the dungeon!

Therefore, unsolvable water-rich sand and pebble formations can be bypassed completely! !

"Director Xu, I think this method is very good!" said the supervisor of the construction technology department.

The stunt technician of the shield machine was also very excited, and said: "Yes, this is the most economical shield machine, and it can also avoid water-rich sand and pebble formations, and a good way to ensure tunneling efficiency!"

The director of the engineering department frowned and said: "The problem brought about by this is that we have excavated at multiple ends and rashly changed the depth of the excavation. It is difficult to control in the later stage. Multiple road sections may not be well connected." The shield machine technician said: "How difficult is this! At that time, ask a geologist to analyze the condition of the strata, mark out the water-rich sand and pebble strata, and then bypass these areas together, it will be fine!" Xu Qiu has been silent.

At present, the method proposed by Zou Botao is indeed the optimal solution to solve the water-rich sand and pebble formation.

Because, even in Berry Country, their advanced shield machines still burp when they encounter water-rich sand and pebble formations, and they are "bruised".

Globally, there is basically no solution.

However, avoiding water-rich sand and pebble formations will still slow progress.

Is there a better and more direct way...

At this moment, a mechanically synthesized voice sounded in Xu Qiu's ear in time.

"Congratulations, you have completed the first survey of the dungeon."

"The construction of the super dungeon is on the right track. Congratulations, you have received incentive rewards!"

"Master earth pressure balance shield tunneling and related technologies!!"

At this moment, a clear and warm current flooded into Xu Qiu's mind.

A great deal of knowledge also poured in.

The structure of the earth pressure balance shield excavation, the details of related technologies, the opening size of the cutter head, the improvement measures of the screw conveyor, etc. At this moment, Xu Qiu suddenly knew the shield machine like the back of his hand, as if he had studied the shield machine for more than 50 years top experts!Originally, Xu Qiu had master-level knowledge of mechanics,

After comprehending the earth pressure balance shield tunneling technology, the two kinds of knowledge are integrated in an instant!

Under everyone's nervous gaze, Xu Qiu finally spoke.

"Old Zou's method can indeed solve the problem, but... it's not enough!"

not enough.…

Everyone was horrified, could Xu Qiu have a better way? !

Zou Botao was full of excitement at the moment, staring at Xu Qiu with wide eyes.

He could sense that Xu Qiu already had a solution.

How can Xu Qiu solve this problem that has plagued engineers all over the world for seven or eighty years! !

He couldn't believe it, but after witnessing too many miracles performed by Xu Qiu, Zou Baitao had no choice but to believe it!

Xu Qiu's voice was calm and powerful, and said:

"Currently, there are two main constraints that restrict the shield machine from passing through the water-rich sand and pebble formation, making it difficult to remove the pebbles..."

"The first is the opening size of the cutter head."

"Second, is the ability of the screw conveyor to pass the largest pebble size."

This point of view surprised everyone.

The shield machine stunt technician scratched his head, this was the first time he had heard such a statement.

Previously, they believed that the geology of the water-rich sand and pebbles was too complicated, with groundwater and sand and pebbles. During the shield tunneling process, the blade would heat up, alternating cold and hot, and the hard sand and pebbles would damage the blade.Therefore, in order to deal with water-rich sand and pebble formations, engineers have been working hard on the sharpness, durability and wear rate of cutterheads and blades.

However, there hasn't been much progress.

Over the past few decades, Longguo, including the world's engineering community, has been frantically improving the cutter head, the sharpness and durability of the cutter head, etc., changing the blade every 50 meters to every 150 meters o

Is it...

Everyone is trying in the wrong direction?

The crowd was silent.

They wanted to hear how Xu Qiu explained it.

"The basic constraint is the passing capacity of the screw conveyor, and the opening size of the cutter head is restricted by the passing capacity of the screw conveyor." Xu Qiu opened his mouth slowly while thinking.

"In order to ensure that the pebbles do not block or block the screw conveyor, if conditions permit, a screw conveyor with a larger profile diameter, tooth height and pitch should be selected as much as possible."

"This allows the conveyor to have the ability to pass through larger diameter pebbles."

"At the same time, the opening size of the cutter head should be smaller than the size of the largest pebble that the screw conveyor can pass through, so as to ensure that the muck that enters the soil bin can be discharged smoothly without blocking the screw conveyor." Ni Jianbai, special technician of the shield machine, was stunned up.

He is the authoritative figure of Longguo shield machine, and also the chief designer of Longguo's first self-developed shield machine!

In the past, all the core technologies of this heavy machinery were in the hands of foreign countries and were monopolized, thus forming a strong constraint on the engineering field of Longguo.

Back then, it cost about 3 million yuan just to buy a medium-sized shield machine from Berry Country.

Later, Ni Jianbai led the team, spent more than ten years, and finally mastered all the core technologies of the shield machine, and developed a domestic shield machine.

Moreover, five years later, the largest shield machine in Longguo and the world's largest was designed. That heavy machine is 150 meters long, weighs 4300 tons, and has a maximum excavation diameter of 16.07 meters! China's shield machine technology has become the focus of the world.

Also since then, Longguo's subway, tunnel and other technologies and construction speed have taken the lead in the world!

It can be said,

In terms of shield machine technology, few people in Longguo are more professional than Ni Jianbai!

But now, Xu Qiu has proposed an improvement idea that is different from the previous cognition of the shield machine.

Choose a screw conveyor with a larger profile diameter, thread height value and pitch.. …

Do not improve the sharpness, durability, and wear rate of the nearby excavated cutterheads and blades.

Instead, upgrade the screw conveyor as the conveying equipment!

What is the principle! !

"Director Xu, according to what you said, if you want to conquer water-rich sand and pebble formations, the field of Longguo shield machine technology, including the World Engineering Shield Machine Association, is all working hard on the cutter head and the blade.

Ni Jianbai was full of incomprehension, and he asked: "You have increased the profile diameter, thread height and pitch of the screw conveyor..."

"Is it really possible to overcome the water-rich sand and pebble formations that have plagued the engineering community for decades?" and.

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Crossing the water-rich sand and pebble stratum is a major problem in the world's subway and tunnel engineering circles, and there is no solution so far.

Xu Qiu...can come up with a solution in such a short period of time?

Not only Ni Jianbai, but also the managers of the general office and the construction technology department were deeply suspicious.

Xu Qiu didn't explain anything, but said: "In order for the shield machine to excavate smoothly in the sand and pebble formation, a shield machine with the ability to crush large-sized sand and pebbles should be selected."

"And to achieve this, it is not to improve the sharpness, durability, etc. of the cutter head and blade, but..."

"Select a hard rock hob that can satisfy the blade track spacing and the maximum particle size that the conveyor can pass through!"

"For example, if the maximum particle size of pebbles set on the screw conveyor of the shield machine is 240 mm, then the distance between the blade tracks needs to be controlled within the range of [-] mm." Ni Jianbo thought,

After a while, he asked: "The water-rich sand and pebble strata in Tiandu Dungeon have two characteristics, namely, high water pressure and large water volume."

"In this case, it is very easy for gushing and water pressure to break through the tail seal of the shield."

"Although the water-rich sand and pebble formation may slow down the excavation speed, the slow excavation can at least prevent the water pressure of the groundwater from breaking through the shield tail seal."

"When the speed is too fast, a large amount of high-pressure water will pour in, and the structure of the shield machine may be severely impacted!!"

Zou Botao and others looked at Xu Qiu.

This problem has also troubled the engineering world for a long time.

Water pressure breakdown is a key reason why they have never dared to increase the tunneling speed of shield machines in water-rich sand and pebble formations.

Related technologies of earth pressure balance shield excavation emerged in Xu Qiu's mind.

The internal structure of the shield machine has gradually become clear.