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Text Chapter 3 Newtonian Mechanics

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    "Ding ding ding" The phone finally rang.  "Uncle, please don't go to the gantry crane lifting site. By the way, ask them to stop quickly" Li Rui opened the flip cover and shouted at the phone.  "Li Rui, what's this mess? Why haven't you arrived yet? I informed you yesterday that you will accompany Director Liang on a business survey today. Come here quickly. When Director Liang comes down, you will have to be criticized again before you arrive." The voice was low.  Muddy, not uncle. A fat, round face flashed in Li Rui's mind. This was the voice of his immediate boss, Luo Xin, director of the Industrial Division of the Planning Commission.  The Director Liang he was talking about was Liang Yongqiu, the executive deputy director of the Industrial Department.  It was while accompanying Liang Yongqiu on investigation that he received the bad news from his uncle.  "Lao Liang, I can't come today. Please help me ask for leave." Worried that the line was busy, Li Rui hung up the phone immediately after speaking.  Although Li Rui is several levels inferior to Liang Yongqiu, Liang Yongqiu is the employee of Executive Deputy Mayor Li Yifeng, and Li Rui is the employee of Guo Wending, so they don't even bother to deal with him at this time.  Not long after, the phone rang again, "Xiao Rui, what happened?" Hearing his uncle's voice, Li Rui breathed a sigh of relief and asked quickly: "Uncle, where are you? Don't go to the crane hoisting site." "I  We are on the way, only two steps away." Li Wenjun said with a slight start.  "You must not go there, and ask them to stop quickly. I am on my way, please wait for me." Li Rui's voice was full of anxiety.  "What happened?" Li Wenjun asked curiously.  "Ah, I can't explain a sentence or two on the phone! Don't go there yet, call them to stop first, I will be there soon." Li Rui did not dare to say that the gantry crane was about to collapse, otherwise Li Wenjun would definitely have passed by  .  Li Rui's tone was urgent. It was rare to hear him be so solemn. Although Li Wenjun was puzzled, he thought for a moment and then said: "Okay, I'll wait for you at the door of the crane branch." After hanging up the phone, Li Rui  All of a sudden, he collapsed on the seat, and then he felt the coldness on his back, and he was already soaked with cold sweat.  Stimulated by the hundred-yuan bills, the taxi driver drove very fast and arrived at Pengong Group in a short time.  After Li Rui got off the car, he was about to ask the guard about the location of the crane branch. A Santana drove over from the factory. Wang Tianyu, who was sitting in the driving seat, waved to him and said, "Li Chu, get in the car." "Li Chu, get in the car."  , you ordered me in a hurry, I just drove to catch up with Mr. Li." Although he was disdainful of Li Rui's character, as Li Wenjun's confidant secretary Wang Tianyu knew Li Rui's identity, he said flatteringly while driving.  .  The person who revealed the truth about the accident to Li Rui was Wang Tianyu. Later, when Li Rui asked him to testify, Wang Tianyu backed down, and Li Rui beat him up.  Now that I think about the huge pressure faced at the beginning, even the Zhang family didn't want to reach out, let alone Wang Tianyu, a small department secretary.  Besides, it was his help that stopped his uncle in time today. Li Rui raised his head and patted Wang Tianyu on the shoulder, saying sincerely: "Xiao Wang, thank you." In Wang Tianyu's impression, Li Rui was not only of low character, but also very arrogant and rude.  , I have always been honest with my little secretary, but today I thanked myself so politely, the sun came out from the west!  "It should, it should!" Wang Tianyu said hurriedly.  The factory area of ??Pengong Group is very large. Except for the roar of machines coming from the workshops on both sides of the road, everything went as usual and no accidents happened yet.  "Over at the gantry crane, Mr. Li has asked me to inform them to temporarily stop hoisting." Wang Tianyu secretly glanced at the silent Li Rui while driving. He was surprised that Mr. Li seemed to be a different person today.  He hurried over to stop the lifting of the gantry crane.  Li Rui nodded.  The car slowed down and turned right into the gate of the Crane Branch Factory.  A figure stood there not far from the gate.  Thirty-six-year-old Li Wenjun is tall, with a straight nose and thin lips, thick eyebrows, big eyes, and slightly curly hair. He definitely looks like a handsome man.  Seeing his uncle standing there alive, Li Rui suddenly felt his nose was sore and his vision was a little blurry.  "What's going on? Why did you ask me to stop hoisting the gantry crane and not let me pass." Seeing Li Rui get off the car, Li Wenjun came up and asked seriously.  In fact, Li Rui's request was somewhat absurd. Out of trust in his nephew and intellectual prudence, Li Wenjun met Li Rui's request, but he was also full of doubts.  Li Rui suppressed his excitement, turned his head, and said: "When I went out today, I heard that your group's gantry crane had problems during the hoisting yesterday evening. This 300-ton gantry crane was not hosted by you personally, uncle."  It¡¯s designed and produced, so II became anxious after I got it.  And that thing is said to weigh several thousand tons. If it collapses, it will be a serious matter, and everyone will be smashed into pieces.  " Li Rui deliberately said it in an exaggerated way. Thinking of the real accident that year, he couldn't help but shudder. It was rare for a nephew to care about him so much. Li Wenjun's expression softened, but when he thought of Li Rui's mention that there was a problem during the hoisting yesterday, his expression changed again.  Sue, he asked Wang Tianyu: "What's the problem with the hoisting?"  Has the installation company reported it?  "According to what Li Rui learned that year, problems had already occurred in the evening before the collapse, but the mechanical installation company of the Mining Bureau responsible for the installation concealed the situation and made operational errors the next morning, which directly led to the accident.  . Sure enough, Wang Tianyu shook his head and said: "I didn't hear there was any problem.  " "Let's go and take a look.  "Li Wenjun waved his hands decisively. "Uncle, is there any danger?  "Li Rui quickly grabbed Li Wenjun and said. "It's okay. I've asked Xiao Wang to notify the scene to stop.  "Li Wenjun patted Li Rui's hand and said with a smile. "The 300-ton gantry crane has a lifting height of about 50 meters, a beam span of 100 meters, and a weight of more than 2,000 tons. The gantry cranes on both sides of the hoisting site have already  Standing tall, the 100-meter-long beam has been raised to about 30 meters in the air. There are more than a dozen installation workers standing on the gantry on both sides, and there are also many people laying pipes and wires below.  Li Rui sighed inwardly, no wonder there were so many casualties back then. Such a big thing fell down and caused the gantry on both sides to collapse. How could these people survive? "Mr. Li, why did you stop us?"  "A lean, middle-aged man wearing a safety helmet and holding a walkie-talkie in his hand ran over. Seeing him, Li Rui's eyes suddenly narrowed. This man was none other than the culprit of the accident, Pengzhou  Qi Cunwei, manager of the Mining Bureau¡¯s Mechanical Installation Company, ¡°Lao Qi, what went wrong during the hoisting yesterday evening?  Why didn't you report it?  " As the manager of the Machinery Installation Company of the Mining Bureau directly under the provincial government, Qi Cunwei's rank is at the top, and Li Wenjun also knows his background, so even though he raised questions, his tone was still polite. " Qi Cunwei was stunned and cursed in his heart.  : I don¡¯t know who is the talkative one who brought this little thing up. This Li Wenjun has always been very strict with quality and production safety. Qi Cunwei quickly explained with a smile: ¡°We can definitely solve some small problems, so it¡¯s okay.  It was not reported.  " "What is the problem?  "Hearing that there was indeed a problem, Li Wenjun stared at Qi Cunwei and asked. Qi Cunwei said carelessly: "When we were lifting the girder last evening, the trolley on it hit the wind rope.  Yesterday it was getting late, so we stopped.  Today I plan to loosen the cable wind rope inside a little and adjust the angle slightly to allow the car to pass.  " Li Wenjun looked up and took a closer look. Sure enough, the control trolley on the girder hit the wind rope on the inside of the rigid leg of the gantry and could not go up. " The rigid leg of the gantry crane cannot move, but the design allows a certain deflection range  . During hoisting, there are two cable ropes on both sides. "Is it strong enough to relax the cable rope?  Have you done any calculations?  "Li Wenjun is a rigorous person and asked with a frown. "Mr. Li, don't worry!  Absolutely no problem.  When our company encountered this kind of situation when installing gantry cranes in the past, we usually handled it like this.  Besides, the relaxation time is very short, only a few minutes, and it will not affect the stability of the rigid legs.  "Qi Cunwei said nonchalantly. "Don't be so full of words, this is a three-hundred-ton gantry crane!  What you have installed before is only a few tons or dozens of tons.  Look at the number of people on site. Once it collapses, all of them will be dead.  "Li Rui, who was standing behind, couldn't help but say. It was because of Qi Cunwei's attitude, belief in "experience" and illegal command that the accident occurred. Qi Cunwei knew Li Rui, the deputy director of the Industrial Department of the Planning Commission with a bad reputation.  Chief, he didn't pay attention at all, and he didn't take the initiative to say hello just now. When he heard the sting in Li Rui's words, he immediately said with a straight face: "Deputy Director Li, you can't say that.  There are two cables fixed on the inside, and it is no problem to loosen one.  You see below we also have a theodolite for measuring the base, which can monitor deviations at all times.  " If Li Wenjun hadn't been there, Qi Cunwei wouldn't have even bothered to talk nonsense to Li Rui. Li Wenjun was not very expert in the installation of gantry cranes. Seeing Qi Cunwei's confident and confident look, he hesitated. After all, half of the beam had been hoisted. If  Putting it down again, re-calculating and adjusting the plan will inevitably affect the construction period and also cause some problems.??Economic losses.  Seeing that Li Wenjun was silent, Li Rui quickly added: "This is a matter of life and death. Has Manager Qi graduated from junior high school? According to Newtonian mechanics, the forces must be equal in size, opposite in direction, and act on the same straight line, so that the object can  Keep it stationary or at a constant speed. This is the simplest principle of junior high school physics. You have to relax the rope, regardless of whether the other one can withstand the strength. As long as you relax one, the tension on both sides will be asymmetrical, even for a few minutes.  If you relax a little, the demonstration of Newtonian mechanics will happen." Qi Cunwei was speechless by Li Rui.  At the same time, it also reminded Li Wenjun that this was a big thing with nearly over 2,000 tons. It was indeed a matter of life and death, and nothing could be left to chance.  "Li Rui is right! Lao Qi, let the workers lower the beams first. The installation plan needs to be readjusted." Qi Cunwei opened his mouth. Although he was not convinced, he had no way to refute.  After listening to Li Rui's words, he felt a little unsure. It was the first time for his company to install a 300-ton big thing. If something happened, he couldn't imagine it.  After looking at the determined Li Wenjun and Li Rui with a sneer on his face, he gritted his teeth and shouted to the on-site project manager: "You didn't hear Mr. Li's instructions! Put down the girder and stop work!"
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