I! Pretending to Be Reborn, Director of Doomsday Hoax

"That is to expand and contract the rail within the appropriate rail temperature range, offset the temperature force inside the rail, and then re-lock the line!"

This method surprised the engineers and railway people.

However, there are still many people who are confused. They are not familiar with the two proper terms of stress relief and rail temperature locking.

Wo Chengwen observed Xu Qiu's face and found that the latter did not object, so he explained:

"Everyone knows that heat expands and cold contracts."

"In the process of thermal expansion and contraction, if the expansion and contraction are constrained, then temperature stress will be generated inside the object, also called thermal stress!"

"In the seamless rail system, the rail can be regarded as a fully constrained object. After calculation, we can know the temperature stress inside the rail."

"From this we can calculate the temperature force."

"These two things can be easily understood by replacing them with mathematical concepts. The temperature stress is evenly distributed. The direct temperature stress multiplied by the cross-sectional area of ​​the rail is the temperature force."

"Through this conversion formula, we have a new discovery that the temperature force of the rail is related to the cross-sectional area of ​​the rail and the range of temperature change, and has nothing to do with the length of the rail!"

"That is to say, under the condition of fully restraining the rail, the length of the seamless line can be arbitrarily increased without increasing the temperature force of the rail!!"

"As long as the stress is released and the rail temperature is locked in advance before laying the tool rails, it can be ensured that even if the seamless railway expands with heat and contracts with cold, the stress generated is within the allowable range and will not cause rail expansion or breakage! "

Qu Huamei, An Yongjia, and the directors of the Railway Design Institute were all surprised by this plan.

An Yongjia, director of the General Administration of Railways, asked, "This idea is genius, but how do you plan to realize it?"

It seems a bit difficult to achieve stress relief and rail temperature locking in advance.

Xu Qiu was also thinking about it. When he heard this question, he nodded and said to Wo Chengwen: "Professor Wo, what is your solution?"

Dare to tell him in front of him, Wo Chengwen's team definitely thought of a countermeasure.

He was very curious about how such a difficult technology was realized.

Xu Qiu deduced various methods in the past few minutes, but none of them worked.

Unless it is to change the rail structure..…

It stands to reason that this technology is almost impossible without changing the structure of the rails.

Is it really changing the designed structure of the extremely cold steel rail?

0...

The first sentence Wo Chengwen uttered confirmed Xu Qiu's guess.

Said the rail engineer,

"According to the size of the nuclear power dragon, our extremely cold steel rails will be produced according to unprecedented quality standards."

"The outer dimensions of the rails must meet the requirements of high straightness and high geometric dimension accuracy, clean steel, no defects on the surface, shallow decarburization layer, small residual tensile stress, high fatigue resistance of the rails, etc... "

"Also, the structure of the steel rails has become a fixed formula."

"And our plan is... to modify the structure of the extremely cold steel rails!"

"We divide the extremely cold steel rail into three parts: the fixed area, the telescopic area and the buffer zone."

"The steel rails in the fixed area are all locked and cannot be moved. This is also the unshakable skeleton of the entire extremely cold steel rail."

"The stretching zone is the key to ensuring stress relief and rail temperature locking in advance! There are some rail gaps inside the rails in this zone, which can meet the stress release requirements!"

"The buffer zone is a buffer zone to further reduce the impact of stress release on the entire rail!"

As soon as Wo Chengwen finished speaking, everyone present showed deep thought.

Qu Huamei said: "Engineer Wo's idea is very good, but the structure of the steel rails is already very stable now, and the extremely cold steel rails are produced according to this structure, and there is nothing wrong with it."

"And if at this juncture, change the structure of the steel rashly, I'm afraid there will be endless troubles!"

An Yongjia looked solemn, and said: "I agree with this idea. The three major welding methods cannot be applied to the extremely cold steel rails. Start directly from the structure of the rails. Try it, maybe there will be a turning point!"

Some people agree, some people deny.

This plan has not been approved by everyone.

So, everyone's eyes turned to Xu Qiu again.

Wo Chengwen and He Yude also looked at Xu Qiu, waiting for the young decision maker to give an answer.

Xu Qiu frowned and shook his head lightly.

At this moment, the engineers of the Capital Iron and Steel Group looked gloomy.

Xu Qiu opened his mouth and asked: "You said that the three major welding methods are not suitable for the laying of extremely cold steel rails. What is the reason?"

Wo Chengwen explained respectfully:

"The laying of high-speed rail and railway seamless lines generally involves welding long steel rails in the base."

"The factory standard length of the high-speed rail is 100 meters, and then the long rails will be welded in the rail welding base. The purpose is to reduce the number of joints welded on site, but the welds cannot be too long to cause inconvenience in transportation."

"Compared with on-site welding, the base welding operation environment is better and the quality control is better."

"After that, long-rail transportation will be carried out, and the long steel rails will be transported from the welding rail base to the laying site with long-rail transport vehicles."

"After arriving, after unloading the rails, dropping the grooves, installing fasteners, and using rail pullers, mobile gantry cranes and other equipment to unload the long steel rails from the car after they are in place, set the position to ensure that they fall into the rail bearing grooves of the sleepers, and then install them. Good fastener."

"Then carry out on-site grinding and adjustment, and adjust the geometric position of the rails in the drop groove first, and then weld them."

"Finally, under the designed locked rail temperature conditions, all the long steel rails are fixed once, and all the fasteners are installed. The laying of the steel rails is completed."

"However, our extremely cold line has a problem at the first step."

"There are no more than ten enterprises and factories in the country that are qualified and capable of producing extremely cold steel rails."

"The distribution of these ten companies is relatively concentrated, and they are basically located in areas with developed heavy industries. It is impossible to complete the welding of long rails at the rail welding base, and then transport them to all parts of the country!"

"Flash contact welding needs to be done at the rail base. Although pressure welding and aluminothermic welding can be performed on site, the quality of the welded rails is not up to standard!"

"Our rail welding bases are distributed in areas with developed heavy industries. After the rails over 100 meters are welded, they cannot be transported to all parts of the country. The rails that are too long are not suitable for transportation!"

Xu Qiu was silent.

The problem now is simple.

After the rail is produced from the production line, it needs to be welded to the long rail at the welding rail base of the factory, and then laid on the ground.

However, the length of the long rail is so amazing that it is almost impossible to transport.

Xu Qiu would not consider this method either.

Nowadays, railway and road transportation are fully loaded with underground city supplies and forest transplanting plans, and it is unlikely that some of the force will be freed up to transport long rails.

So what's the solution...

Xu Qiu closed his eyes, tapped his index knuckles on the table, lost in thought.

At this moment, the conference room became extremely silent, and countless people held their breath, not daring to disturb Xu Qiu.

People's eyes were burning, and they really wanted to know what kind of solution Xu Qiu would give to this problem! !

Da da da.

The venue echoed with the sound of joints banging on the table.

Xu Qiu seemed to have turned into a wooden sculpture, standing quietly in place.

A few minutes later, Xu Qiu suddenly opened his eyes, and the knocking stopped abruptly.

Everyone woke up startled, looking at Xu Qiu eagerly and expectantly.

Wo Chengwen and He Yude's hearts were beating wildly. They had already witnessed Xu Qiu's accomplishments in this area. In terms of rail welding technology, could he come up with a new plan?

Xu Qiu's majestic and unquestionable voice sounded, and said: "Engineer Wo's method is actually very valuable, but... just like Dean Qu said, our time is running out." "We There is no chance of trial and error, and it is impossible to overthrow and rebuild the already foolproof rail structure."

"Even if it succeeds, it means that the entire iron and steel enterprise needs a comprehensive replacement from the production line to the equipment. The Capital Iron and Steel Group can do it, but other enterprises may not be able to do it!"

"So, I don't advocate working on the structure of the extremely cold steel rails."

"I have a very simple solution."

"Currently, the rails are welded, and the rails that leave the factory are at most 100 meters, and then enter the welding factory to weld the long rails, and finally lay them."

"The problem lies in these two links. The welding base is tied to the steel factory, and the journey from the production site to the destination is too long..."

"Then why not build a welding base on every main line of the arctic route?"

This question was very soft, but it hit everyone's heart like a heavy hammer! !

"is it possible? "

The pupils of Wo Chengwen and the others shrank sharply, and Xu Qiu's words echoed in their heads.

Welding process, including too many things...

Starting from blanking, it is necessary to prepare welding materials, clean up before welding, preheat, spot solidify, select welding parameters such as current, voltage, air flow, etc., as well as layer temperature control, deformation control, welding method, welding sequence, Control of post-weld heat treatment and inspection...

Is it really feasible to build such a huge welding base on the main line of every extremely cold line?

Judging from the length of the extremely cold line and the vastness of the Dragon Kingdom, even if only one welding base is built for each extremely cold line near the dungeon, a total of a thousand will be needed!

National construction of welding base......

Zou Botao's expression was shocked. This kind of plan was only conceived by a person like Director Xu!

Xu Qiu ignored the doubts in everyone's eyes, but looked at An Yongjia, director of the General Administration of Railways,

"Director An, I have a task for you."

A smile appeared on Xu Qiu's face.

Is it feasible to build welding bases across the country?

Answers will be forthcoming.and.

Chapter 95 rises from the ground!Under the steam, the Dragon Kingdom broke the ice! !

An Yongjia immediately stood up with a serious face, "Director Xu, what are your orders?"

"Currently Longguo, among the top welding equipment companies, or welding bases, who can rush to the conference room of the crisis bureau within 10 minutes?"

The Railway Bureau and these companies basically have intersections, and the one present who knows the information best must be Ernst & Young.