Rebirth of the Industrial Tycoon

Chapter 607: Yangmou

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

Experts of this level are not just invited. The reason why Li Weidong was able to invite Academician Chen Tongshu was also because he had spent a sum of money on Chen Tongshu before.

In the technical school run by Li Weidong, there is a course on demolition of bridges in the excavator major, which was written by Chen Tongshu.

If it is a large bridge, blasting is usually used to demolish it, but for small bridges in some 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 go down and the bridge collapses By the way, digging a hole to bury the construction waste is much faster than manual work.

But demolishing bridges is different from digging foundations after all. Not only technology is required, but also architectural knowledge is required. If an accident is caused accidentally, it will not only cause property damage, but may also cause casualties.

Therefore, Li Weidong did not dare to be sloppy in the course of demolition of bridges, and directly asked Chen Tongshu, a 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 imported computers with high configuration to Chen Tongshu's scientific research project.

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

Since the benefactor who had given the money asked, Chen Tongshu did not refuse, so he came to Qinghe, hoping to ask for another research grant by the way.

Even if Chen Tongshu didn't get any sponsorship for this trip, it would definitely not be in vain. For an expert of this level, just give him some pointers, and a few thousand yuan of transportation expenses must be indispensable.

A second-generation Mitsubishi Pajero was driving slowly along the bank of Qinghe River. Chen Tongshu sat by the window and looked at the bank of Qinghe River outside the window.

At this time, there was no water in the river, and many places on the river bed could be seen covered by green grass.

Li Weidong, who was next to him, introduced; In the past, during the rainy season, the river rose, which would cause floods in Qinghe City. At that time, the task of flood fighting and disaster relief was 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 stored in the dry season can be used for agricultural irrigation, and the water volume can also be adjusted after the rainy season. Since then, the urban area has never been flooded again.

The entire North China region is relatively dry this year, so the upstream dams have started to store water early. If there is no water on the top, the downstream river will dry up, so grass will grow on the riverbed here.

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

When the rainfall is relatively concentrated, the river water will rise very quickly, which will easily cause flood disasters downstream. For this type of river, when building bridges, attention must be paid to the hydrological characteristics.

That's what you said, that's why I invited you over! 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 the Qinghe Bridge on Tuanjie Road. It is also one of the two most important bridges connecting the two sides of the river in Qinghe City. This bridge was built in the mid-1960s, and the other one is in the city center. It was built in 1996. The new bridge was built. Li Weidong introduced.

Chen Tongshu glanced at it from a distance, and then said: It was built in the 1960s, and the structure should be a five-hole reinforced concrete continuous slab girder. The length of this bridge should be about 1,700 meters?

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

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

The car stopped on the side of the bridge, and then everyone got out of the car.

Standing on the bridge, Chen Tongshu took a closer look 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 were put together into one!

Li Weidong couldn't help but stretched out his thumb, and said, Academician Chen, you are really good, you can see it! The north half of this 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 relatively narrow, with a width of less than ten meters. Of course, there were few people and cars in the 1960s, and it was still a suburb at that time, so a bridge with a width of 10 meters could meet the needs.

In the 1980s, there were more people and cars, and the 10-meter-wide bridge was not enough. In the mid-1980s, a new 10-meter-wide bridge was built next to the old bridge. The two bridges together are the bridge of Tuanjie Road under our feet now.

Now the half of the old bridge runs from west to east, and the half of the new bridge runs 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. You can see that there are many residential areas on both sides of this bridge!

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

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

Chen Tongshu came under the bridge and checked carefully, his expression became more and more serious.

Chen Tongshu's appearance made the accompanying people feel weak for a while.

Li Weidong heaved a sigh of relief, thinking to himself that Chen Tongshu didn't ask for nothing, and he really saw the problem.

Then Li Weidong pretended to be curious, and asked, Academician Chen, is there any problem with this bridge pier?

Chen Tongshu nodded: This bridge is dangerous, it must be suspended 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 currently in a state between a third-category bridge and a fourth-category bridge. If it is not rested immediately, it will soon become a fourth-category bridge.

Chen Tongshu went on to explain: According to the assessment standards of bridge technical conditions, bridges are divided into five categories. The first category is that the bridge is in a new state and has complete functions. The second category is that the bridge has a slight defect, but it has no effect on the function of the bridge. .

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

The fifth category of bridges has serious defects in the main components and cannot be used normally. Under normal circumstances, when the fourth type of bridge is reached, in order to ensure safety, the bridge should be sealed and no further traffic can continue! As for the fifth category, it is uncertain when it will collapse.

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

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

I understand. Li Weidong took a deep breath and continued, 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 inspection report of the bridge with a solemn expression.

Academician Chen, with 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, the design life was 50 years, and when the new bridge was built next to it in the 1980s, the old bridge was reinforced. It was said at the time that it would take three There is no problem in forty years, but it has only been a dozen years, how can it be turned into a dangerous bridge! Academician Chen, you read that right, right? A leader said puzzled.

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 did the bridge suffer serious damage in only ten years? It is caused by the following reasons.

First of all, don’t overestimate the technical bridge-building technology in the 1960s. At that time, there was still a certain gap between the materials and the construction technology compared with the present.

Secondly, the assessment of the 50-year service life was made based on the road conditions and traffic conditions at that time. The current traffic situation is completely different from that in the 1960s. There are more vehicles and their loads are heavier, so the service life of the bridge must be shorter than the designed service life.

Third, the two bridges are joined 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 happen.

Fourth, and most importantly, is the negative impact of sand mining. If I'm not wrong, the river should be full of sand mining boats in the past few years, right?

Li Zhongwei nodded: Academician Chen, you guessed it right. A few years ago, the private mining of river sand was indeed very serious here. There were sand fields everywhere on both sides of the Qinghe River. After a series of iron-fisted politics, it was finally put an end to it. The situation of illegal mining of river sand.”

However, sand mining has had an irreversible impact on the bridge. Unreasonable sand mining has shaken the foundation of the bridge piers, which is the root cause of the bridge's damage, Chen Tongshu said.

There is a saying that people rely on mountains to eat mountains and rely on water to drink water. The Qinghe River contains a lot of sand, which also made the situation of illegal mining of river sand very serious in the Qinghe River 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 mining of river sand has basically disappeared after vigorous rectification, the adverse effects caused by private mining of river sand are irreversible. It may take hundreds of years to wait for natural restoration.

For example, swimming is prohibited in the Qinghe River, not because of the rapid flow of the Qinghe River, but because there are many undercurrents under the water after sand mining. The deepest pits left by sand mining are more than ten meters deep, forming a downward spiral in the water. suction 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 be able to survive.

Pirate mining of river sand will also cause serious damage to bridges. For example, the Tuanjie Road Bridge was damaged due to illegal sand mining a few years ago.

Frozen three feet does not happen in a day. Half of the Tuanjie Road Bridge was built in the 1960s and the other half was built in the 1980s. Illegal sand mining in the Qinghe River is 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 has caused damage to the bridge piers. This is a very reasonable explanation, and it is said by Chen Tongshu, a bridge authority, that everyone present is 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: Repairs are necessary. If repairs are not carried out, the damage of the bridge will definitely continue to deteriorate. Maybe in two or three years, the bridge will be unusable.

But even if the bridge is repaired, it is only an expedient measure, which can only treat the symptoms, not the root cause. The best way is to tear down the bridge and build a new bridge. This is the solution once and for all.

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

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

Chen Tongshu also knew that this kind of bridge didn't mean you were the one who built it, so he explained: As I said just now, sand dredging is irreversible for the damage to the bridge piers, so repairs alone cannot make the bridge pier damaged. The bridge was restored to its original condition.

It's like you cut off a person's finger. Even if the injury is healed, the finger will not grow back. This is the reason, so the repair is just to make the bridge last for a few more years. Eventually a new bridge would 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 masses must not be able to use this bridge anymore, otherwise it will increase the risk of the bridge.

Let me compare the human body again. It is like a person who has a serious illness. Although the illness is cured in the end, his body is not as good as before, and he can no longer do heavy work! If it is forced to regenerate and do heavy physical labor, it may exhaust people to death.

The same is true for the bridge. Although the damaged parts 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 serious accidents. Therefore, it can only be used for passing vehicles. Do a weight limit.

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

Academician Chen, I have to ask you to help us with the repair of the bridge and make a plan for us. We are responsible for the relevant personnel, equipment and expenses you need.

Although Qinghe's financial situation is not enough to repair the new bridge, it still has the money to ask Academician Chen to formulate a repair plan. What's more, this is a major matter related to safety, so it is natural to do it as soon as possible.

It's a matter of people's livelihood, and Chen Tongshu didn't refuse. He nodded, Okay, I'll make a phone call later and ask the courtyard to send some engineers over. Let's discuss it together and come up with a repair plan.

To the west of the Tuanjie Road Bridge, there is no need to pass the first intersection, which is the site of the heavy machinery factory.

Early in the morning, Zhang Tao's car had just driven into Tuanjie Road when it was blocked on the road.

At that time, except for the first-tier cities, there were not many vehicles in the second-, third-, fourth, and fifth-tier cities. Traffic jams were very rare. Except for waiting for traffic lights, motor vehicles were basically unimpeded.

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

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

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

Factory Manager, you are finally here! A subordinate ran over in a panic.

What happened? Zhang Tao asked subconsciously.

The man said eagerly: The Tuanjie Road Bridge is blocked, and all passing vehicles cannot pass through, and our loader can't get out!

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