"What! template? Xiao Li, are you saying that the template may not be enough? You came to me today to add a template. ”

Li Huayong found Old Man Cai today and said that today's matter "must be decided by you", to be honest, Old Man Cai was still a little nervous at first, and he didn't know what the big deal was with Li Huayong, who had always seemed calm and calm, to find him.

But when Li Huayong explained his intentions, of course the tension was gone, replaced by a sense of irony, but thinking about Li Huayong's words is not an exaggeration, adding a template is actually increasing the cost of the project department, and when it comes to costs, of course, only the leader can call the shots.

Thinking of this, Old Man Cai didn't continue to think deeply, and said to Li Yu, who came in with Li Huayong:

"Dumbfounded, what the hell is going on? Didn't you ask you to arrange the construction progress backwards plan a few days ago? I remember reminding you after the meeting, ah, you have to put out this material preparation plan together. You, you... Speaking of this, Old Man Cai shook his head, looking like he hated iron but not steel:

"You guys, I really don't know what to say about you, can't you be careful about what you usually do, you tell me now, how can there be a shortage of formwork on the construction site... ”

Without waiting for Old Man Cai to finish speaking, Li Er was stunned and shouted that he was wronged:

"There is no shortage of formwork on the construction site, Commander Cai, think about it, from the plan I mentioned to now, we have completed the construction of three floors, these days, have you heard someone say that there is a shortage of formwork?"

Old man Cai thought about it, it has been more than half a month, if there is really a lack of formwork on the construction site, then everyone should have found it earlier, and will wait until today to know? So old man Cai looked at Li Huayong again:

"This... Xiao Li, tell me in detail, what the hell is going on?"

"Mr. Cai, if you follow the current speed, the template is indeed enough, but as you just said, our construction speed still has potential to be tapped, and I think if you want to further tap the potential, you must increase the template. ”

"Huh, what do you mean by that?"

Old man Cai stared at Li Huayong, and Li Huayong also looked directly at Old Man Cai:

"Mr. Cai, what we are talking about tapping potential, to put it bluntly, is to compress the construction time, compress all kinds of construction time, and do our best to compress the operation time of each process as much as possible. So what time do you think is the most valuable to compress to a certain extent?"

Old man Cai became interested in Li Huayong's question, but he didn't think about it himself, he asked Li Huayong directly: "Then Xiao Li, what time do you think there is still to use?"

"The time for the concrete to set, we can use the time when we wait for the concrete to set and then disassemble the formwork. ”

Old man Cai was shocked, he first looked at Li Huayong, and then looked at Li Er's stunned:

"Come, let's sit down and say... ”

Old man Cai himself is an old builder, so he understands Li Huayong's words as soon as he hears them. In fact, let alone Old Man Cai, even ordinary people know that it takes a certain amount of time for concrete to solidify, so you can't remove the formwork immediately after pouring concrete.

And Li Huayong's meaning is to make use of this time and the time to wait for the concrete to set. If you want to do this, you have to add templates.

After sitting down, Old Man Cai didn't talk to Li Huayong first, he first "reprimanded" Li Er's stunned:

"You didn't expect that?"

"I thought about it at the time, I just didn't think it was necessary, I'll tell you, in fact, I don't think it's necessary now... ”

Old man Cai could see that these two should have argued about this issue before they came in, but they didn't fight for a result before, so they fought in front of him. It's okay to let them each give their reasons.

Li Er was stunned and began to show off his professional knowledge in front of Li Huayong:

"Of course, it takes a certain amount of time for concrete to solidify, which is something that ordinary people know, but how exactly does concrete solidify? How many stages can its solidification take? How long does it take to solidify? And what strength can it reach in each time period? You may not know much about the pier, right?"

Li Huayong couldn't help but laugh: "I want to hear about it." ”

"The setting time of concrete is actually really hard to say, which is related to the variety of cement; and the amount of admixture, the variety of admixture, and the temperature after construction; and whether the sun is directly exposed during construction, whether there is wind during construction; and especially in this admixture, the relationship between concrete solidification and admixture is greater, such as early strength, slow setting, rapid setting, and so on... ”

Seeing Li Er stunned and dropping his bookbag there, Old Man Cai's face darkened: "Let's talk about the point." ”

"Well, let's talk about the key points, simply put, the solidification of concrete is divided into initial setting and final setting. The initial setting time of concrete at room temperature is generally 3~6 hours, the hand lightly presses the concrete surface, does not stick to the hand, the concrete surface collects water, and there is a layer of shiny film for the initial setting; The final setting time is generally 8~10 hours, of course, the temperature in summer and winter is different, the setting time will be shortened or extended, of course, these are not the focus, the focus is still the strength of the concrete... ”

Speaking of this, Li Er was stunned for a moment: "It takes about 28 days for concrete to fully reach the design strength, which I think everyone knows." But you may not know what the "concrete strength growth curve" is. Simply put, the strength of concrete continues to increase with the increase of curing time, showing a curvilinear relationship. Before 14 days, the curve was steeper, after 14 days the curve began to flatten, and after 28 days, the curve became more flat. That is to say, with the extension of the curing time, the strength of the concrete continues to increase, starting faster, and then gradually slowing down... Well, I won't say that these are useless... ”

Hearing this, Li Huayong and Old Man Cai laughed at the same time in their hearts, and said in their hearts, You also know that you are talking about something useless.

“。。。 Let's go back to the topic just now, why did I just say so much? Just want to show that the strength of concrete grows very quickly at the beginning, for example, the pier just mentioned the problem of formwork demolition, in our project, generally 12 hours after pouring concrete, up to 24 hours, according to the strength of the concrete has been reached, in fact, the formwork can be removed. According to our previous inverted plan, if the construction speed of the first floor in four days is followed, then there is no need to add formwork at all, which is neither necessary nor economical. ”

Although Li Er was stunned and said a lot of nonsense, it still sounded very reasonable on the whole. At this time, Old Man Cai set his eyes on Li Huayong.

Li Huayong smiled slightly, and he first joked with Old Man Cai:

"Mr. Cai, do you think Li Gong is a bully? He is obviously bullying me, I'm just a high school student. ”

"Hey, hey... Hearing Li Huayong say this, Old Man Cai and Li Er were stunned and laughed at the same time.

"Well, since Li Gong bullied me into being a high school student, then I will use my high school knowledge to ask Li Gong a question, I remember that the chemistry textbook in middle school once said: The solidification process of concrete is an extremely complex physical and chemical change process. I just want to ask Li Gong, this complex physical and chemical change process, we human beings have fully grasped or understood, right? For example, the template removal time you just mentioned, can you guarantee that there will be no problems when the template is removed at this time?

"This... ”

Li Er was stunned and speechless. Li Huayong sighed in his heart, of course he knew that Li Yu would definitely not dare to guarantee it, let alone praise this Haikou. Because what Li Yu just said can only be said to be an empirical statement, and no one can guarantee that there will be no accidents 100%.

This is also the reason why Li Huayong knows that the "three days and one layer" has been realized in this project in real history, but when he is immersed in the scene, he is still trembling and walking on thin ice.

Shortly before Li Huayong's crossing, in his hometown in his previous life, there was a major construction safety accident when a cooling tower collapsed at a power plant, causing more than 70 casualties. Li Huayong doesn't know if this is the biggest casualty accident in the history of construction, but it is definitely the biggest casualty accident he has ever heard.

As for the cause of the accident, although Li Huayong does not know the inside story, according to Li Huayong's professionalism and judgment based on public information, he does not think that this is a problem of cutting corners, because it was the operating platform that collapsed, which does not belong to the construction product itself.

As for the cause of this accident, Li Huayong can only evaluate it in one sentence: empiricism kills people.

What kind of empiricist mistake is that? This is actually what Li Erzi just said.

The accident in real history occurred when workers were erecting or lifting the platform. Of course, the construction platform of the cooling tower may be more special, not an ordinary scaffolding, and the construction personnel and materials may be stacked on a platform, so this kind of platform is very large, very heavy, and the requirements are relatively high.

But no matter what the platform, it needs to be stressed and supported. The platform chose to use the building itself as a support. As a result, when the accident occurred, it was found that the concrete had not yet solidified in the place where the support was selected. . .

The strength of the construction unit in the real history is actually quite strong, and it is a professional construction unit of cooling towers that has won the "Luban Prize". Then how could they make such a low-level mistake? That is, of course--- empiricism like Li Er's stunned, they think that at that time, the concrete should have solidified...

The real situation is that although Li Huayong was not in his hometown in those days, he also knew that the weather in his hometown was hot and cold in those days, sometimes the sun was shining, and sometimes there was ice and snow.

And this is probably the most important cause of that accident.

Li Huayong was reminiscing about the past, and Li Er was dumbfounded by Li Huayong's question. For a moment, there was a brief silence in the room.

After Li Huayong came back to his senses, he threw Li Erzi the second question:

"Li Gong, you just said that your inverted plan is considered according to the four-day one-layer, but what if I say that this speed is not enough? I want to reach the three-day one-layer now, do you think that if you follow this rate, then you still need to increase the template?"

"Hmm!"

Hearing Li Huayong say this, Li Er's eyes widened in a daze, and the old man Cai next to him also widened his eyes.