In Li Huayong's mind, he first ruled out that this was an error in the survey report.

The reason why Li Huayong made this judgment is based on his trust in domestic survey units. In this era, if our country still has a lot of backwardness and deficiencies, its survey capability is still very good. Since the beginning of liberation, various geological teams, geophysical exploration teams, survey teams... While wandering in the land of China, looking for various resources for the country, he also trained a very strong team.

Those who do engineering surveys in China actually have the same roots as these people. Therefore, Li Huayong believes that the error in judging a rock layer is as high as 10 meters, and they can't do this kind of thing.

But the question is...

In this large corner, there are many specimens collected from the ground. Li Huayong pretended to be interested and went to observe the rock samples collected 10 meters underground.

“。。。 The color is blue and granular, which. This is a typical weathering feature, is the survey report really wrong?。。。 But... ”

Li Huayong inadvertently looked out the window, and when he saw the terrain of the entire construction site, Li Huayong suddenly had a flash of inspiration, and he finally remembered some possibility.

"Zhuzi, look at the terrain here, is it very similar to the topography of the border stream in front of our house. ”

"Huh?"

Li Huayong's cousin Zhuzi was asked inexplicably, he said in his heart where is this, there is a stream in his hometown, but here is a big construction site, how can such a terrain be imagined, and we are here to find work, you suddenly talk about what terrain and terrain... What do you want?

But since my cousin has already asked, and there are so many people here, of course Li Huazhu can't say anything else:

"yes, yes, it looks a bit like that, you look at the mountains on both sides... ”

"I just don't understand, how do you say there are so many stones in our border stream, how did those stones come from? ”

Li Huazhu complained wildly in his heart again, his heart was finished, a few days ago he suspected that his cousin had a problem with his brain, and he thought he was getting better, why did he get sick again at this time? You said that you don't say such an inexplicable question, the question is that you need to be so loud? As if you want the whole room to hear it...

Of course, Li Huayong wanted the whole room to hear it, and among them, he especially wanted the people in the Survey Institute to hear it!

Chen Yiqun, Dean Chen of the Survey Institute, did hear it. Lao Chen was stunned for a moment when he heard this, and said a few words silently:

"What rushed down from the mountain, what washed down from the mountain... ”

Then Lao Chen came to the window where Li Huayong was standing as fast as he could, and carefully observed the terrain of the entire construction site.

"Hahaha, I know! These stones were indeed washed down from the mountain, and our work survey report is not wrong... ”

At this moment, Lao Chen smiled happily, and he did have reason to be happy.

As the surveyor of this project, Lao Chen has been under a lot of pressure recently. The significance of this project, Lao Chen knew it very early, and he knew that this project under his feet was not only a key project in Pengcheng, but also registered in the province. Lao Chen even heard that even the central government was paying attention to the project.

Such an important project, if there is a problem in the engineering survey... Lao Chen didn't dare to imagine what the consequences would be.

Although Lao Chen is sure that there should be no problems with the survey report issued by his unit, the feedback from the construction unit is real, especially after seeing the rock samples they took from 10 meters underground---- as a geological engineer, Lao Chen can't lie to himself, it is indeed a typical "weathering" feature, that is, the so-called rock formation characteristics.

The so-called word to wake up the person in the dream, Li Huayong's seemingly unintentional sentence instantly made Lao Chen understand all the problems.

"It's not really a rock formation at all, it's just isolated rocks... Lao Chen began to explain to Manager Lei:

In geology, we call this kind of stone "boulders", "stones floating underground", how did these "boulders" come from? Let's take a look at the terrain here, from the topographical features, this place we stand under our feet should have been a river channel or a riverbed in ancient times, and later because of some kind of crustal action, or because of an earthquake, or because of a tsunami, the riverbed slowly rose after the landslide and the ground cracked, and the river disappeared or was diverted, but at minus 10 meters underground, there was such a thing"Drift rock layer", when you are in the construction, is there a pile that is going well, until more than 20 meters to see the rock formation, only part of the pile only encountered problems in the minus 10 meters or so? ”

Lao Chen's eyebrows danced, Lao Lei frowned when he heard it, and the expressions of the two formed a strong contrast, especially when Lao Chen continued to speak:

"Lao Lei, I can tell you, your pile foundation can not fall on this kind of boulder, this kind of boulder is extremely unstable, it can never be used as a bearing layer, you have to find a way to pass through this layer of boulder, the pile foundation must fall to the real rock level... ”

Of course, Lao Chen has reason to be relaxed, because as long as the problem is clearly explained, as long as there is no problem with the work survey report, then they will not have any responsibility.

And Lao Lei's frowning brows naturally make sense, and now the source of the problem has been found, but how to solve the problem? Lao Lei still has no clue.

"You have to find a way through this layer of boulders. Lao Chen said with a relaxed face, but Lao Lei sounded like he just wanted to scold his mother. If I say that this layer of boulders is so easy to traverse, then what am I going to trouble you for? If I have this time to argue with you, then I might as well think about how to speed up the construction progress.

These boulders are so difficult to entangle, from a geological point of view, these boulders are not rock formations, but from a construction point of view, these stones are no different from rock formations, or even more troublesome than rock formations.

According to the specification requirements of "kanyan pile", the "kanyan depth" is generally half of the pile diameter, that is, the pile foundation with a pile diameter of 1 meter usually requires 0.5 meters of kanyan, and the pile diameter of 2 meters requires 1 meter of kanyan.

Lao Lei personally experienced some time ago: the best "impact drill" on the construction site to deal with these boulders usually takes several days to penetrate them. "Percussion drill" is okay, after all, there is still a time to break through, if the upper shelf is a "rotary drill", ten days and a half months can not complete a pile.

"What a hassle... ”

The more Lao Lei thought about it, the more he felt a headache. This is the first construction site I was responsible for after transferring to "Huaxia Construction General", and I held my breath and wanted to make a good start, but I didn't expect to encounter such difficulties at the beginning.

There are more than 800 piles on this site, and the construction period is 150 days, but now it has been almost 2 months, and more than 70 have been completed, which is less than one-tenth of the total...

"That's a real problem ... ”

While Lao Lei was having a headache, Li Huayong was also thinking about such a question. Li Huayong once again looked out the window and looked at the dozens of drilling rigs scattered on the construction site.

"It's all some old antiques... ”

In the future, it would not be a problem to encounter this layer of boulders. The state-of-the-art "rotary excavator" on the rack penetrates this boulder layer in minutes. But in this era, Li Huayong is not very clear about the situation abroad in this era, but in China, there should be no "rotary excavator".

At present, there are two most important types of drilling rigs in China, one is called "percussion drill" and the other is called "rotary drill". The characteristics of these two types of drilling rigs can be seen from the name. The so-called "percussion drill", to put it bluntly, is to smash the drill bit down, use the gravity of the drill bit, and use the impact force of the drill bit to become empty. And the principle of the "rotary drill" ---- which is also nothing to say, you can imagine how the grinding disc works.

These two kinds of drilling rigs have their own characteristics, but the characteristics are relatively single, and the later generations of "rotary drills" take into account the characteristics of both.

To deal with soft soil, the "whirlwind drill" is easy to use, and when encountering hard soil or stones, the "impact drill" is easy to use. Li Huayong looked at the dozens of drilling rigs on the construction site and found that the two models accounted for roughly half each.

Normally, the hole forming efficiency of the "rotary drill" is a little higher than that of the "percussion drill", which is the most advanced model of this era. There can be so many "whirlpool drills" on this construction site, which shows that "Huaxia Construction General" has invested a lot of money on this construction site.

But now the most troublesome problem: because of the existence of this boulder layer, these "whirlwind drills" have basically become chicken ribs, because no one knows the specific situation underground, and no one knows which pile will encounter those big stones that make people headaches.

And even those "impact drills" --- due to power problems, if you can't break those big stones, then the further down you hit, the tighter you hit.

"What to do?"

Li Huayong fell into thought again.