"Hao Wazi is back, sit there," the old man said to Hao Tian, pointing to the sofa. Pen, fun, pavilion www. biquge。 info Haotian came to Grandpa Ye and saw that he was reading the document, and he kept writing something. "Grandpa, you're busy, I'm fine, I just want you to come and have a look," Haotian knew that Wen Li couldn't mention it anymore, so he could only bury it in his heart, how Haotian hoped that Wen Li could stand in front of him, it must be something that happened in the middle of the time reversal, I hope the Demon King knows the situation, Haotian will not give up looking for Wen Li. Haotian looked at Grandpa Ye and suddenly frowned. He got up and came to his desk, looking at the roadway map drawn by the old man, combined with the current situation of the coal mine during this period, Haotian knew what he was worried about. "Grandpa Ye, are you worried about the roadway support of the coal mine?" "How do you know?" the old man asked in surprise, "My major now is also coal mining, and I have carefully watched the five major disasters in coal mines. Haotian can only find a way to deal with it, and he can't say that he was reborn, and after many years of exploration, the coal mine has developed various effective methods to reduce and break off the occurrence of these major disasters. "Oh, tell me what you've been watching?" the old man was also interested when he heard this. "Grandpa Ye, our country's coal mining time is relatively short, the previous soil method does not know how many years have been used, since the founding of the People's Republic of China, coal mines have developed all over the country, because coal is an important source of energy in our country. However, with the rapid development, the coal shaft is deepened, and various uneasy factors also occur, such as the support of the roadway, the generation of gas, ventilation problems, water and fire, and the roof also threaten the lives of miners at any time,,,, "Haotian said and couldn't help but recall the tear-jerking scenes of later generations, the bloody lessons, how many people have devoted themselves to the study of coal mine disasters, and every achievement is how many fresh lives. The old man looked at Haotian incomprehensibly, a technical school student who had not yet graduated, a child who had grown up by himself, today he felt a little unfamiliar, or the child who usually talked little and did things to worry about? The old man looked at Haotian with blazing eyes, the majesty of a soldier was invisibly emanated, and Haotian also felt the change in the air, this is a person's aura, and some people call it official. Haotian shrugged his shoulders and looked at the old man with a wry smile: "Grandpa, don't scare me, I'm cowardly," "Hahaha, the kid is good!" Grandpa Ye stood up and patted Haotian on the shoulder, and then smiled happily.

The old man pulled Haotian to sit beside him: "Haowazi, you haven't learned this book in vain, I always thought that the technical school was a springboard for the employment of the children of the coal mine, and the technical school was the pre-job training, today you taught me a lesson, there are talents there, I should care about you in the past two years, and the coal mine also needs you." The old man said with emotion. Haotian knew that the old man would be leaving his job in two years, because he was going to retire because of his age.

The old man pulled Haotian to sit at the desk, pointed to the documents on the table and said to Haotian: "Haowazi, the day before yesterday there was a roadway accident in the Q mine, the roof is good, but the roadway was destroyed more than 20 meters, one dead and two injured, grandpa can't understand, how many years I have seen the support on the mine are very important, now basically do not use pit wood support, are all with I-beam, but now it seems that there is something wrong, and if you don't find out, you can't fundamentally solve the problem." Haotian listened quietly, "Grandpa Ye, how deep is this mine now?" "The vertical is now 500 meters, and there is no way to eat the lower coal because the upper coal has been mined, but the roof support is good, it shouldn't be like this!" Haotian looked at this old man who had given his life to the coal mine, for the happiness of tens of thousands of miners and their families, the old man was heartbroken, and not a single accident made him sleep. Haotian's mind suddenly flashed: impact ground pressure, yes is impact ground pressure.

Haotian did not expect that the rock burst has happened now, maybe he was not too worried about the coal mine in his previous life, Haotian knew the danger of rock burst, it can make hundreds of meters of roadway instantly destroyed, when everyone knew the danger of rock burst in the previous life, they began to study the anti-scouring measures, the most effective at that time was the O-shaped shed support, as well as the drilling pressure relief, and finally used a large door-shaped bracket. "Grandpa Ye, I know where the root of the disease is," "Really? Hao Wazi?" the old man couldn't help but get excited. "Tell grandpa about it?" Haotian looked at the old man, "Grandpa Ye, I don't care if what I said is right or not, you don't tell others what I said, you can try it if it is useful." The old man looked at Haotian, "You can talk about it first, grandpa listen." ”

Haotian picked up a piece of paper and pen, drew a underground roadway on it, and then looked at the old man and said: "Grandpa Ye, I think so, because as the roadway deepens, there will be a kind of pressure underground, the deeper the pressure, the greater the pressure, no one knows where this pressure is, when it will be prominent, like a balloon, you keep blowing, you know that with the continuous blowing, the balloon will definitely burst, but you don't know when it will burst, where it ,,,,will burst from" Haotian said, the old man kept nodding:" Is this the reason, do you mean that the I-beam shed is no longer suitable for deep coal mines?" "Well, Grandpa Ye, what do you think, the I-beam shed is protected from the roof, and the impactable ground pressure may protrude from the coal seam, or it may be the bottom, which is impossible to prevent. ”

The old man frowned and thought, the root cause has been found, and the next thing is to find a way to prevent it, and the existing support equipment really can't play a role. Haotian looked at the old man who was dedicated to the public, thinking about whether to design the O-shaped shed in advance, a student who had not graduated, what did outsiders think when they knew, he was only reborn for two days, everything had just begun, and after thinking about it for a while, Haotian looked up at the old man: "Grandpa Ye, I once had a dream at school, the roadway support in the dream is completely different from the current one, and I remember it very clearly because it feels fresh!" The old man looked at Haotian for a long time, "Good boy, if you can succeed, grandpa will thank you on behalf of all the miners, what did you dream of?" "Grandpa Ye to be honest, I don't know if I can use it, but grandpa must promise me, all this has nothing to do with me, I still want to play for a few years, be happy!" Looking at the children he grew up watching, the old man said: "Okay, grandpa hopes that you will study hard in the future, serve our mine more, serve the miners, your grandfather and I have a deep affection for the coal mine, we have been restored to this together, and we have never thought of leaving, the hearts of the miners are pure, and the miners' efforts are selfless." The old man was full of emotion.

Haotian didn't hesitate, he drew it directly on the paper, and drew the shape of the O-shaped shed and the connection parts one by one, so that the old man could see the big mouth, where is this dream, it is simply a complete design drawing, perfect.