Rebirth of the Industrial Tycoon

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Academician Chen Tongshu graduated from Southwest Jiaotong University. He is the disciple of Mr. Mao Yisheng, a famous bridge expert in China, and is also a top bridge expert in China.

Experts of this level cannot be hired just by asking. The reason why Li Weidong was able to invite Academician Chen Tongshu here was because he had spent a lot of money on Chen Tongshu before.

The technical school run by Li Weidong has a bridge demolition course in the excavator major, which was written by Chen Tongshu.

If it is a large bridge, blasting is usually used to demolish it. However, for some small bridges in villages and towns, the blasting team is naturally not needed. At this time, excavators and other construction machinery can come in handy. A few shovels can be used to collapse the bridge. , by the way, dig a hole and bury the construction waste, which is much faster than doing it manually.

But demolishing a bridge is, after all, different from digging a foundation. It requires not only technology, but also construction knowledge. If an accident occurs accidentally, it will not only cause property damage, but also may cause casualties.

Therefore, Li Weidong did not dare to be careless about the course on bridge demolition and directly asked Chen Tongshu, the top bridge expert in China, to write it.

Those who can build bridges must also be good at tearing them down.

For this course, Li Weidong sponsored 100,000 yuan and two high-configuration imported computers for Chen Tongshu's scientific research project.

Since then, Li Weidong has been in contact with Chen Tongshu.

Since it was the request from the donor who had given money, Chen Tongshu did not refuse and came to Qinghe, hoping to get another scientific research sponsorship.

Even if Chen Tongshu couldn't get any sponsorship for this trip, it would definitely not be in vain. An expert of this level would definitely be indispensable for a few thousand yuan in travel expenses if he gave some casual advice.

A second-generation Mitsubishi Pajero was driving slowly on the bank of Qinghe River. Chen Tongshu was sitting by the window, looking out at the bank of Qinghe River.

There was no water in the river at this time, and you could see that many places on the river bed were covered with green grass.

Li Weidong, who was standing next to him, said: “In the past, during the rainy season, the river water rose, which would cause the danger of flooding in Qinghe City. At that time, flood fighting and disaster relief tasks were the top priority in July and August every year.

Later, we built a dam in the middle and upper reaches of the Qinghe River. The water can be stored for agricultural irrigation during the dry season, and the water volume can be adjusted after the rainy season. Since then, the urban area has never suffered from flooding.

The entire North China region is relatively dry this year, so the dams upstream began to store water early. If water is not released upstream, the river downstream will dry up, so grass will grow on the riverbed here. "

Chen Tongshu looked into the distance, and then said: "Your Green River is similar to most tributaries in the lower reaches of the Yellow River. The river bed is relatively high, the river water contains relatively rich sediment, and there are many shoals and sandbars downstream.

When rainfall is relatively concentrated, the river water will rise very quickly, easily causing floods downstream. When building bridges for this type of river, hydrological characteristics must be paid attention to. "

"You said that, that's why I invited you here!" Li Weidong said with a smile.

The car continued to move forward, and gradually, a bridge appeared in the distance.

"Academician Chen, in front of us is our Tuanjie Road Qinghe Bridge. It is also one of the two most important bridges connecting both sides of the river in Qinghe City. This bridge was built in the mid-1960s, and the other one in the city center was only built in 1996. The new bridge was built," Li Weidong introduced.

Chen Tongshu glanced at it from a distance, and then said: "Constructed in the 1960s, the structure should be five-hole reinforced concrete continuous plate girders. The length of this bridge should be about 1,700 meters, right?"

"Academician Chen, you are right. The length of this bridge is just over 1,700 meters. At that time, it was the longest highway bridge in our province." Li Weidong replied.

"Then let's get out of the car and take a look!" Chen Tongshu said.

The car came to a stop on the bridge, and then everyone got out of the car.

Standing on the bridge, Chen Tongshu observed it and said, "What you just said is wrong. This bridge is actually two bridges put together. The northern half should have been built in the 1960s, and the southern half should have been built in the 1960s. It was built more than ten years ago, and then the two bridges became one!”

Li Weidong couldn't help but stretched out his thumb and said, "Academician Chen, you are so awesome, you can see it! The north half of the bridge is an old bridge built in the mid-1960s.

However, the technology and financial resources at that time were relatively limited, so the bridge was built relatively narrow, with a width of less than ten meters. Of course, there were fewer people and fewer cars in the 1960s, and this was still a suburb at that time, so a ten-meter-wide bridge could meet the needs.

By the 1980s, there were more people and cars, and the ten-meter-wide bridge was no longer enough. In the mid-1980s, a new ten-meter-wide bridge was built next to the old bridge. The two bridges come together, which is the Tuanjie Road bridge under our feet now.

Now the half of the old bridge is driven from west to east, and the half of the new bridge is driven from east to west, which is equivalent to doubling the number of lanes. The surrounding area has also changed from a suburb to an urban area. Look, there are many residential areas on both sides of the bridge! "

After listening to Li Weidong's introduction, Chen Tongshu frowned. He looked under the bridge and then said, "Let's go under the bridge and take a look!"

Since the dam upstream has blocked the river water, there is no river water under the bridge and the bridge piers are exposed.

Chen Tongshu came under the bridge and investigated carefully, his expression became more and more solemn.

Chen Tongshu's appearance made those around him feel weak.

Li Weidong let out a sigh of relief and secretly thought that Chen Tongshu's invitation was not in vain. He really saw the problem.

Then Li Weidong pretended to be curious and asked: "Academician Chen, is there anything wrong with this bridge pier?"

Chen Tongshu nodded: "This bridge is in danger and must be suspended from use as soon as possible!"

"What? You mean this bridge has become a dangerous bridge?" Li Weidong pretended to be surprised.

"According to my judgment, this bridge is now in a state between a Category III bridge and a Category IV bridge. If it is not repaired immediately, it will soon become a Category IV bridge."

Chen Tongshu went on to explain: "According to the bridge technical condition assessment standards, bridge grades are divided into five categories. The first category is that the bridge is in a brand new state and has complete functions. The second category is that the bridge has slight defects, but has no impact on the bridge's function. .

The third category of bridges has moderate defects and can still maintain normal functions. The fourth type of bridge has major defects in the main components, which seriously affects the function of the bridge or affects the load-bearing capacity, and cannot guarantee normal use.

The fifth category bridges have serious defects in their main components and cannot be used normally. Under normal circumstances, when it comes to the fourth type of bridge, in order to ensure safety, the bridge should be sealed and no further traffic can be allowed! As for the fifth category, there is no telling when it will collapse. "

Li Weidong immediately said: "Academician Chen, you just said that this bridge is about to reach the fourth category, which means it will be closed soon?"

"According to my visual judgment, it should be close to the fourth category, but I still need specific measurements with instruments before I can give a final conclusion!" Chen Tongshu said.

"I understand." Li Weidong took a deep breath and then said, "I will report to our city leaders immediately."

In the conference room, almost all the leaders of Qinghe City were present.

Secretary Li Zhongwei looked at the bridge's inspection report with a solemn expression.

"Academician Chen, given the current situation, will there be a major accident on our Tuanjie Road Bridge?" Li Zhongwei asked.

"Not in the short term, but not necessarily in three or four years." Chen Tongshu said.

"How could this be? When the old bridge was built in the 1960s, its design life was only fifty years. Moreover, when the new bridge was built next to it in the 1980s, the old bridge was reinforced. At that time, it was said that it would not be used for another three years. There has been no problem for forty years. How come it has become a dangerous bridge in just ten years? Academician Chen, are you reading that right?" a leader said in confusion.

"Even if you don't believe me, you should believe in science, right? The results of the test report are true." Reporter Chen Tongshu said; "As for what you said, why has this bridge been seriously damaged in just more than ten years? I think It is caused by the following reasons.

First of all, don’t overestimate the technology of bridge construction in the 1960s. There was still a certain gap between the materials and construction technology at that time compared with now. The service life of the bridge in the 1950s was somewhat watery compared to today.

Secondly, the assessment of the fifty-year service life at that time was based on the road conditions and traffic conditions at that time. Today's traffic conditions are completely different from those in the 1960s. There are more vehicles now and the loads of vehicles are larger, so the service life of the bridge must be shorter than the design life.

Third, the two bridges are put together, which will definitely have an impact on the bridge structure. Even if it is reinforced, it is not the original design after all, and safety problems are very likely to occur.

The fourth and most important point is the adverse effects caused by sand mining. If I guessed correctly, there should have been sand mining boats on this river in the past few years, right? "

Li Zhongwei nodded: "Academician Chen, you are right. The situation of illegal mining of river sand here was indeed very serious in the past few years. There were battlefields everywhere on both sides of the Qinghe River. Later, after a series of iron-fisted politics, this was put to an end. The illegal mining of river sand.”

"But sand mining has caused irreversible effects on the bridge. Unreasonable sand mining has shaken the foundation of the bridge piers. This is the root cause of the bridge's damage." Chen Tongshu said.

There is a saying that people who rely on mountains and rivers eat water. Qinghe contains a lot of sand. This also made the illegal mining of river sand very serious in Qinghe in the early years. When Li Weidong first started selling agricultural tricycles, many people bought tricycles to transport sand and make money.

Although the phenomenon of private river sand mining has basically disappeared after vigorous rectification, the adverse effects caused by private river sand mining are irreversible. Waiting for natural restoration, it may take hundreds of years.

For example, swimming is prohibited in the Qinghe River. This is not because the current of the Qinghe River is fast, but because there are many undercurrents under the water after sand mining. The deepest pit left by the sand mining is more than ten meters deep, which will form a downward spiral in the water. sucking vortices, which are not visible on the surface. At a depth of more than ten meters, once a person is sucked in, he will definitely not survive.

Illegal mining of river sand can also cause serious damage to bridges. For example, the Tuanjie Road Bridge suffered damage to its piers due to illegal sand mining in the past few years.

Three feet of ice does not freeze in a day. Half of the Tuanjie Road Bridge was built in the 1960s and the other half was built in the 1980s. The illegal sand mining of Qinghe River is only a matter of recent years. Therefore, the private mining of river sand in the early years , has already caused damage to the bridge.

Sand mining caused damage to the bridge piers. This is a very reasonable explanation, and since this was said by Chen Tongshu, an authority on bridges, everyone here was naturally convinced.

Li Zhongwei asked: "Academician Chen, since the Tuanjie Road Bridge has been damaged, what remedial measures should we take now? Does it need to be repaired?"

Chen Tongshu replied: "Repair is necessary. If repairs are not carried out, the damage to the bridge will continue to worsen. Maybe in two or three years, the bridge will no longer be usable.

But even if the bridge is repaired, it is only a temporary measure. It can only cure the symptoms but not the root cause. The best way is to demolish the bridge and build a new one. This is a once and for all solution. "

"We need to build a new bridge..." Li Zhongwei suddenly looked embarrassed.

Building such a bridge will cost a lot of money. With the current financial situation of Qinghe City, it will not be able to come up with that much money in at least two or three years.

Chen Tongshu also knew that this kind of bridge was not just built by you, so he explained: "I just said that the damage to the bridge piers caused by sand dredging is irreversible, so repair alone cannot The bridge was restored to its original condition.

It's like cutting off a person's finger. Even if the injury is healed, the finger will not grow back. This is the truth, so repairing is just to make the bridge last a few more years. Eventually a new bridge will have to be built.

Moreover, even if the bridge is repaired, the weight of passing vehicles will still need to be limited in the future. Heavy vehicles with relatively large mass will definitely not be able to use this bridge, otherwise it will increase the risk of the bridge.

Let me use the analogy of the human body again. It is like a person suffering from a serious illness. Although the illness is finally cured, the body is not as good as before and can no longer do heavy work! If forced to do heavy physical labor, the person might be exhausted to death.

The same is true for bridges. Although damaged areas can be repaired, the structure of the bridge body and the load-bearing capacity of the piers have changed. If it is overloaded again, it will inevitably cause a serious accident. Therefore, passing vehicles can only be repaired. Implement weight restrictions. "

"I understand." Li Zhongwei nodded and continued: "When we built the new bridge, we put it on the agenda. At this stage, we will repair the bridge first to ensure that people's daily travel will not be affected.

Academician Chen, we need your help in formulating a plan for bridge repair. We are responsible for the relevant personnel, equipment, and expenses incurred. "

Although Qinghe's financial situation is not enough to build a new bridge, it can still get the money to ask Academician Chen to formulate a repair plan. What's more, this is a major matter related to safety, so it naturally needs to be done as soon as possible.

It was a matter of great importance to the people's livelihood, and Chen Tongshu did not refuse. He nodded: "Okay, I will make a call later and ask the hospital to send a few engineers over. We will discuss it together and come up with a repair plan."

Heading west of the Tuanjie Road Bridge, you don't have to go past the first intersection, which is the site of the Heavy Machinery Factory.

Early in the morning, the car Zhang Tao was riding in was blocked on the road as soon as it entered Tuanjie Road.

At that time, except for the first-tier cities, there were not many vehicles in other second-, third-, fourth- and fifth-tier cities. Traffic jams were very rare. Motor vehicles were basically free of obstruction except waiting for traffic lights.

Finally, Zhang Tao's car drove into the courtyard of the heavy machinery factory.

On both sides of the road leading to the office building, eight loaders were parked ready for shipment.

"Aren't these eight loaders going to be shipped early this morning? Why are they still parked here?" Zhang Tao looked at his watch and then got out of the car.

"Director, you are finally here!" A subordinate ran over in a panic.

"What happened?" Zhang Tao asked subconsciously.

Just listen to the man saying anxiously: "The Tuanjie Road Bridge is blocked. No vehicles can pass. Our loader can't transport it out!"

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