"Hmm, what do you think of?"

"I, just now from the sliding mold you said, I think there is a way to try, no, no, no, this can't even be said to be a way, at most it can only be said to be a habit, a good habit, I think if we let our workers develop this habit, I think our construction speed may be faster." ”

Although Li Huayong's words are a bit winding, the focus of his words should be what kind of "habit", but unfortunately Li Erzi is not a Li Erzi, and his attention is all attracted by "inspiration from the sliding model".

"Get inspiration from the sliding mold? Yo! Amazing! Dunzi really can't see it, you still know the sliding form? You may not know, at present, there are few units in the whole country that have mastered this technology, how do you know the sliding form?"

Li Huayong laughed secretly in his heart, it wasn't once or twice that he encountered this kind of thing:

"This... Before the meeting, didn't you give me a half-day of science popularization on the road? With you Li Dagong personally in class, no matter how stupid a person is, he can learn a little something. ”

Li Er was stunned and choked by Li Huayong again, he had the heart to despise Li Huayong, this seemed to be questioning himself, but if he didn't despise it, he didn't believe that he had just a few words before he was killed, what inspiration could Li Huayong get. He can get inspiration, but what about himself? Why don't he have any inspiration?

"Okay, you say, what good idea did you come up with?"

Li Huayong said with a smile: "Li Gong, you have been talking about this synovial membrane just now, and now even I know that this is a very fast construction process, so okay Li Gong, let me ask you first, the reason why this process is fast, then what is the main reason for its speed?"

Without waiting for Li Er to speak, Li Huayong himself said: "The main thing is that the formwork project is almost above, because of the use of sliding form technology, except for the first installation of the formwork, there is no such process behind, which saves a lot of time, this is the reason why the sliding form is fast, right?"

Li Er smacked his lips in a daze, he had indeed talked about this thing before, and it was not surprising that Li Huayong knew this. But now the question is: what inspiration can this guy generate just by knowing the most superficial things?

Li Er was stunned and didn't wait long, he soon heard Li Huayong say his "inspiration".

"We are now using the traditional "turning mold" process, the formwork installation is not only each layer can not be saved, and even the workload of this formwork project is very large, I have heard Deng Gong of Shekou said, he thinks that the formwork project is the control project of our project. ”

Speaking of this, Li Huayong paused:

"Therefore, after I heard you talk about the sliding form, I thought in my heart, although we are turning the mold, but we can still learn from the idea of sliding mold in the specific construction. For example, we ask the workers to pay attention to each piece of formwork during construction, what part it is used in the next layer, and what part it is still used in the previous layer. So Li Gong, if we do this, can our construction speed be improved a little more?"

Li Er's eyes lit up when he heard this, this is indeed a good way. At this moment, Li Er was stunned and stared at Li Huayong with a hippie smile: "Many people say that you have wisdom, I didn't believe it before, but now it seems that you still have to accept it, at the very least, you still have this simple wisdom." ”

Li Huayong couldn't cry or laugh, and at the same time he was a little impressive. In my previous life, I did a lot of technology, but I still managed the site less, and I forgot about this stubble for so long. Li Er was stunned and right, this is indeed "simple wisdom", but this is a very effective method, many experienced construction companies in later generations to do this kind of molding, basically will pay attention to such small details.

Some of them are so extreme that they don't even have to move the nail eye, and the next layer is still nailing where the template is, and the upper layer is still nailing somewhere. Although this is only a kind of "simple wisdom", this wisdom can greatly improve the labor efficiency of workers and effectively speed up the construction speed. With this kind of similar fine management idea, in fact, even if the traditional turning process is used, it can achieve the same effect as the sliding mold.

Due to the age, Li Huayong did not know what kind of process was used in the real history of the "Pengcheng World Trade Center". However, when thinking of "one layer in three days", Li Huayong's first thought is actually a sliding form. Even that day, when they held a "closed-door meeting" with Lei Jianjun and Deng Chaoqun in Shekou, Li Huayong was ready to use a slip mold to pretend to be forced, but at that time, Li Huayong decided to give up after thinking about it again and again.

To say that the process of slip mold is actually not a new technology, in Li Huayong's impression, this process seems to have been invented by the Japanese, they have used this technology in the 50s, as for whether it is earlier, then Li Huayong is really not clear.

Sliding form, as the name suggests, is that the formwork is not removed during construction, so that the formwork "slides".

The principle of this construction process is to take the hydraulic jack as the power of the formwork to slide, under the synchronous action of the group of jacks, let the formwork slide along the surface of the freshly formed concrete or the surface of the special sliding frame, and then the concrete is poured into the sleeve groove by the upper mouth of the formwork, and the whole construction is completed in this way.

As for the advantages of this process, needless to say, in the textbook: sliding form process, with a high degree of mechanization, fast construction speed, less site occupation, strong structural integrity, good seismic performance, safe operation guarantee, significant environmental and economic comprehensive benefits, and so on.

Since there were so many advantages, why didn't Li Huayong consider them at that time? Because there were pros and cons, Li Huayong took into account several practical problems, or in other words, he took into account several defects in the process of sliding form, which made him finally decide to give up.

First of all, the sliding form process has certain limitations. In order to adopt this construction method, it is necessary to have a so-called "equal cross-section" of the building. This means that all the dimensions of the upper and lower layers must be exactly the same.

In fact, even ordinary people can imagine this, such as CCTV's "big pants", or Yangcheng's "small waist", this type of building, it is definitely impossible to take a sliding model.

Of course, for the "Pengcheng World Trade Center" currently under construction, it has the requirement of "equal section", but Li Huayong still believes that this type of civil building is not suitable for the use of sliding form.

Sliding molds are really used a lot in the field of industrial buildings, such as some industrial chimneys, such as raw material warehouses and clinker warehouses in cement factories.

In a nutshell: sliding forms are best suited for some circular buildings with simple structures and small areas. And such as Pengcheng World Trade Center, such an angular civil building, although the sliding form can also be used, but in the arrangement of the jack group is a big trouble, a careless, it is easy to cause uneven lifting of the sliding form.

The second point is that the lifting of each formwork in sliding form construction is usually about 30 cm, which is a construction operation method with strong continuity. And it is precisely this "continuity" that makes Li Huayong shy away from this construction method.

Li Huayong has always believed that construction methods with strong continuity are usually accompanied by great safety and quality hazards.

This is a bit similar to the pile foundation project in Shekou. Continuity is also required in pile foundation work. How can we say this? This is just like Li Huayong's previous example of putting less steel cages on pile foundations.

Of course, less steel cage is a kind of cutting corners, and in pile foundation engineering, the phenomenon of less steel cage is indeed very common. But an interesting question: Is all the lack of reinforcement cages because the construction workers subjectively want to cut corners? Li Huayong is not defending his peers, and sometimes, even most of the time, it is not necessarily.

The length of a steel cage is usually 9 meters long, and as you can imagine, it is actually a bit difficult to put such a large thing into the hole, a little crooked, or a little obstacles, the steel cage is easy to get stuck in the hole. It can be said that in the construction of pile foundation, the situation that the reinforcement cage is stuck occurs from time to time.

You must know that the pile foundation construction can not be stopped, once the pause time is too long, resulting in couch holes, collapse, it is likely to cause more serious quality problems. Then in no way, the most common "cutting corners" phenomenon in pile foundation engineering was born.

This is the case for pile foundation engineering, in fact, there is a similar situation in sliding form construction.

Most things in this world have pros and cons. Because of the use of sliding formwork, carpentry is easy, but what about reinforcing steel workers? Because only 30 kung fu concrete is poured each time. Then on the slipform construction site, the rebar worker is not called "tied" the rebar, but "wearing" the rebar and "wearing" the needle lead. During the lifting of the formwork, the workers should "wear" the steel bars at any time.

In this case, even if it is not the intention of the workers, cutting corners is inevitable. Obviously, the design requires 10 centimeters to wear a steel bar, but sometimes it is too busy, and continuous operation and high-altitude work are not easy to monitor, so what about 9 pieces of 1 meter? Or even 8 or 7 pieces of 1 meter?

No matter how embarrassed others are, Li Huayong is not very embarrassed anyway. Because in real life, Li Huayong has seen too many such examples.

It can be said that it is precisely for this reason that Li Huayong has an instinctive resistance to sliding molds. You must know that the "Pengcheng World Trade Center" is a monument in the history of Chinese architecture, if it is because of his participation in the management, but in the end he made a "tofu scum project", then Li Huayong, as a traverser, really can't afford to lose this person.