Chapter 607 Yang Conspiracy

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

An expert of this level is not something that can be obtained just by asking. 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.

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

If it is a large bridge, it is usually demolished by blasting, but some small bridges in villages and towns naturally do not need a blasting team. At this time, construction machinery such as excavators can come in handy. Go down with a few shovels and shovel the bridge down. , By the way, dig a hole to bury the construction waste, which is much faster than manual work.

But demolition of bridges is not the same as digging foundations after all. It not only requires technology, but also construction knowledge. If an accident occurs accidentally, not only property damage, but also personal injury may be caused.

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 are certainly good at demolishing bridges.

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

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

Since it was a request from the sponsor who had given money, Chen Tongshu did not refuse, so he came to Qinghe, hoping to ask for another scientific research sponsor by the way.

Even if Chen Tongshu can't get the sponsorship this time, it will definitely not be in vain. For an expert of this level, if you give any pointers, a few thousand yuan for traveling and horses will definitely be indispensable.

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

There was no water in the river at this time, and many places on the riverbed could be seen covered with green grass.

Li Weidong, who is next to him, said: In the past, during the rainy season, the river water rose, which would cause floods in Qinghe City. At that time, the task of fighting floods 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 can be used for agricultural irrigation in the dry season, and the amount of water can be adjusted after the rainy season. Since then, the urban area has never been flooded.

The entire North China region is relatively dry this year, so the upstream dams began 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 said, Your Qinghe River is similar to most of the tributaries in the lower reaches of the Yellow River. The riverbed is relatively high, the river water contains relatively rich sediment, and there are many shallow sandbars in the lower reaches.

When the rainfall is relatively concentrated, the river water will rise very rapidly, and it is easy to cause floods in the downstream. This type of river, when building bridges, must pay attention to the hydrological characteristics.

That's what you said, 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 the Qinghe Bridge on Tuanjie Road, which 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 is in the city center. It was only in 1996. The completed new bridge. Li Weidong said.

Chen Tongshu glanced at it from a distance, and then said, Constructed in the 1960s, the structure should be a five-hole reinforced concrete continuous slab girder. 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. It was the longest highway bridge in our province at the time. Li Weidong replied.

Then let's get out of the car and have 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 said just now 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 more than ten years ago, and then the two bridges made one!

Li Weidong couldn't help but stretched out his thumb and said, Academician Chen, you are really amazing, 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, and the width was less than ten meters. Of course, in the 1960s, there were fewer people and fewer cars, and it was still a suburb at that time, so a ten-meter-wide bridge could meet the needs.

In the 1980s, there were more people and vehicles, and a ten-meter-wide bridge was not enough. In the mid-1980s, a new ten-meter-wide bridge was built next to the old bridge. Together, the bridges are the bridge on Tuanjie Road under our feet.

The half of the old bridge now travels from west to east, and the half of the new bridge is from east to west, which is equivalent to double 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 quarters on both sides of this bridge!

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

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

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

Chen Tongshu's appearance made the people around him feel empty for a while.

Li Weidong let out a sigh of relief, secretly thinking that Chen Tongshu was not asking 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 pier?

Chen Tongshu nodded: This bridge is dangerous and 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, the bridge is now in a state between a Category 3 bridge and a Category 4 bridge. If there is no immediate rest, it will soon become a Category 4 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 the function is complete. The second category is that the bridge is slightly damaged, but it has no effect on the use of the bridge. .

The third category of bridges has moderate defects and can still maintain normal use functions. The fourth type of bridge is the major defect of the main components, which seriously affects the use 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 blocked and no further traffic can be continued! 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, the bridge will be closed soon?

According to my visual judgment, it should be approaching 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 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 bridge inspection report 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. Forty years, there is no problem, how can it become a dangerous bridge after only ten years of hard work! Academician Chen, you read it 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 did the bridge suffer serious damage in just over ten years, I think 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, the service life in the 1950s has some moisture.

Secondly, the 50-year service life assessment 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. Now there are more vehicles and the load of the vehicles is heavier, so the service life of the bridge is definitely 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 of sand mining. If I'm not mistaken, there should have been sand mining boats on this river a few years ago, right?

Li Zhongwei nodded: Academician Chen, you guessed right, the situation of privately mining river sand here was indeed very serious a few years ago, and there were battlefields everywhere on both sides of the Qinghe River. Later, after a series of iron-fisted politics, this was stopped. The situation of stealing river sand.”

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

There is a saying that relying on the mountains to eat the mountains and relying on the water to draft water, the Qinghe River contains a lot of sand, which also makes the Qinghe River in the early years, the situation of illegal sand mining is very serious. When Li Weidong first started selling agricultural tricycles, many people bought tricycles to transport sand to make money.

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

For example, swimming is prohibited in the Qinghe River, not because of the turbulent water flow in the Qinghe River, but because of the many undercurrents underwater after sand mining. The vortex of suction, which is invisible on the surface. At a depth of more than ten meters, once a person is sucked in, he will definitely not survive.

The illegal mining of river sand can also cause serious damage to bridges. For example, the Tuanjie Road Bridge was damaged due to illegal sand mining in previous years.

Frozen three feet is not a cold day. Half of the Tuanjie Road Bridge was built in the 1960s, and the other half was built in the 1980s. The Qinghe River sand control illegal sand mining is a matter of recent years, so the private mining of river sand in the early years , has already caused damage to the bridge.

The sand mining caused damage to the bridge pier, which is a very reasonable explanation, and this is said from the mouth of Chen Tongshu, the bridge authority, and everyone here is naturally convinced.

I saw Li Zhongwei ask: Academician Chen, since the Tuanjie Road Bridge has been damaged, what remedial measures should we take now? Do we need to repair it?

Chen Tongshu replied: Repairs are necessary. If the repairs are not carried out, the damage of the bridge will continue to deteriorate. Maybe after two or three years, the bridge will not be able to be used.

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

We're going to rebuild a new bridge... Li Zhongwei suddenly looked embarrassed.

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

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

It's like if you cut off a person's finger, even if the injury is healed, the finger will not grow back. The truth is this way, so the repair is just to make the bridge last for a few more years. Eventually the new bridge will have to be built.

And even if the bridge is repaired, it is necessary to limit the weight of passing vehicles in the future. Heavy vehicles with relatively large masses must not be able to walk on the bridge again, otherwise the risk of the bridge will be increased.

If I use the human body as an analogy, it is like a person who has a serious illness. Although he is cured in the end, his body is not as good as before, and he can no longer do heavy work! If they were forced to be reborn with heavy physical labor, they might be exhausted to death.

The same is true for the bridge. Although the damaged areas can be repaired, the structure of the bridge body and the load-bearing of the piers have been changed. If overloaded operation is carried out again, it will inevitably cause serious accidents. Weight limit.

I understand. Li Zhongwei nodded and continued: When building 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, I have to trouble you to help us with the bridge repairs 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, he 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, and it is natural to do it as soon as possible.

It was 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 hospital to send a few engineers over. Let's discuss it together and come up with a repair plan.

...

To the west of the Tuanjie Road Bridge, without crossing the first intersection, is the site of the Heavy Machinery Factory.

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

In that era, apart from first-tier cities, there were not many vehicles in 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 courtyard of the heavy machinery factory.

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

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 got out of the car.

Director, you're finally here! A subordinate rushed over with a panicked look.

What happened? Zhang Tao asked subconsciously.

I just heard the man say eagerly: The Tuanjie Road Bridge is blocked, all vehicles cannot pass through, and our loaders can't be transported out!

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