When it was determined that the station should be built in this place, Shucheng arranged for people to find a water resources testing unit in Golmud and conducted a series of mineral tests on the river water to see if the river water met the drinking standards. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ

From the outside, the river water is crystal clear, and its source points directly to the Kunlun Mountains, which is likely to be the water of the snow melt on the Kunlun Mountain Plateau.

Plateau Snow Mountain, under normal circumstances, the mineral content is relatively low, but for the sake of safety, Shucheng still arranged for someone to take water samples for testing.

I didn't expect the water sample test to be so timely, Cai Mao just asked if the water could be drunk directly, and Xu Jin sent the results of the river water test.

"Lao Cai, I just got the test results, this river water can't be drunk directly." Shu Cheng held his mobile phone and said helplessly.

"If you can't drink it, what should you do, you won't have to transport water from Golmud, right?" Cai Mao said tangledly.

"You're okay, you live here for less than a month, the workers have limited water, and the water can be pumped from the river, so our project department is in trouble, and now the river water can't be directly drunk, so it's hard to drill a well!" Shucheng Road.

The main reason why the station and steel processing plant were located here in the past was that the transportation was convenient, and the power supply was not far from the power supply, which could supply power to the project department.

The last reason is this river, Shucheng hopes that through the river water of this river, it can be drunk directly, or after simple treatment, it can be drunk, so that the road, electricity, and water are solved.

As long as the station is built and all kinds of facilities are complete, it will be able to work, but at the critical moment, the river water suddenly appears undrinkable.

Now the location of the station and the steel processing plant have been decided, and the Land Bureau has also approved it, but it can't be changed if it is to be changed, so it can only be built in this place.

"Manager Shu, why don't we build a small tap water purification plant and put it in the station, so that the safety of water can also be guaranteed, I always feel that even if the river water is fine, there may be an accident if you drink it directly." Yan Yuyang proposed.

Of course, Shu Cheng knew what Yan Yuyang meant, he was afraid that someone would poison him, not to mention this matter, some people could really do this kind of thing in order to vent their inner dissatisfaction.

At the beginning, Shu Cheng also thought about this problem, but when he thought that the river was flowing, even if he was drugged, it would be washed away, so he didn't care much, and the other party couldn't pour a large bucket of medicine into the river.

Besides, if Shu Cheng wants to pump the water in the river, it must be in the center of the river, more than ten meters of the river, the deepest one is more than three meters, and the probability of being drugged is very small, which is one of the reasons why Shu Cheng didn't take it to heart.

"I also think it's okay to build a small tap water purification plant, and transport drinking water from the steel processing plant and mixing plant from here, so that water from the river can be used for domestic use and other purposes." Wu Batian also spoke.

"Okay, then build a small tap water purification plant in the station to provide everyone with food and drink, as for other water, directly pump it from the river, after going back, the plan for the construction of the station should be slightly changed, add the layout of the water purification plant, and consider the burial of various pipelines." Shu Cheng thought for a moment.

After all, this is a plateau area, and if the water pipeline is not kept warm, it is easy to freeze.

After viewing the construction site, the steel processing plant and the mixing plant, everyone walked to Golmud, and as soon as the migrant workers of the two construction teams arrived, they could start construction.

In the evening of the same day, Shu Cheng went to the construction headquarters to hold a meeting on the construction of the mixing plant.

Those who followed Shu Cheng were Lin Xiaoyong, the chief engineer of the project, Wu Batian, the deputy manager, and Yan Yuyang, and Chang Kai, who is now the safety director, did not participate.

The site of the construction headquarters has been renovated and has been settled a few days ago.

In the conference room on the third floor, the commander Yao Gongjun, the secretary Sheng Qi, the chief engineer Kong Zhijin, and the deputy commanders Li Cong and Zhao Ming are others.

The meeting was chaired by Deputy Commander Li Cong.

"Today's meeting, mainly to discuss the construction of the mixing plant, the construction commander has been in the field for almost 50 days, the first to the fifth project division, has also entered the site for more than 20 days, recently, the construction of the five project divisions and steel processing plants, is advancing, and the construction of the mixing plant, but there is no improvement, the main reason is still affected by the environment of the plateau area." Li Cong spoke first.

The main reason why the mixing plant has not been started until now, and even the construction team has not yet entered the site, is that the problem of how to build is still being considered.

At this time, someone has a pain in the egg, build a mixing plant, and discuss how to build, which project department to build a mixing plant, is not it convenient to choose a good place, and then arrange for the construction team to enter the construction, but also use a special meeting to build a mixing plant?

Actually, don't forget, this is a plateau area, it is the sky route, and due to the plateau frozen soil, the requirements for concrete are extremely high!

"The construction of the mixing plant in the first and second divisions is relatively easy, because there is no plateau permafrost in the construction area, while the third, fourth and fifth divisions are different, there is a permafrost layer of permafrost, and it has strict requirements for the temperature of concrete, and how to mix this kind of concrete is a problem we need to discuss today." Li Cong said.

Since the permafrost layer of the permafrost is ice, the pile foundation is driven into it, and when the concrete is poured, the heat of hydration of the concrete will release a large amount of heat, and once the heat is released, the ice around the pile foundation will melt.

Once the ice melts, it will cause cavities around and below the pile foundation, which means that the pile foundation cannot act on the ground and has no support.

In this case, it may not be a sinking pile at the beginning, because the pile foundation can rely on the friction between the pile and the soil and the frozen soil to keep it from sinking.

But with the cushion cap on the pile foundation, the pier body construction, and even the box girder on the erection, the weight is huge, and the friction of the pile foundation, once it cannot support the pressure at the top of the pile foundation, the pile foundation will sink.

If the ice does not melt, the permafrost can fully support the pressure from the upper part of the pile foundation and remain unsinkable.

However, once the lower part of the pile foundation and all sides are hollow, as the pressure increases, if the friction does not work, the pile foundation will definitely sink.

Once the pile foundation sinks, it will be followed by the overall sinking of the cap, pier body and beam body.

Once the beam body sinks, the final result is that the rail line sinks, affecting the train running.

This kind of subsidence can be remedied during construction, and once it is opened to traffic, it sinks under the action of dynamic load, and accidents are likely to occur.

Therefore, how to ensure that the permafrost layer does not melt in the process of pouring pile foundation concrete is very important.

And all this must be controlled from the source of concrete.

"For the construction of the first and second mixing plants, it is already in progress, but some problems have been found recently, first of all, in terms of tank selection, the last hail, a tank was directly smashed out of several dents by the bowl-sized hailstone." Li Cong said.

A few days ago, a batch began to build a mixing plant, just transported the material storage tank of the mixing plant to the site, it rained hail, I heard that it was not small, and directly smashed the material storage tank into a dent.

"These things are not expected by us, in the future, when building a mixer, we must not only consider the warmth factor, but also take into account the harsh environment, how to make the equipment, in the harsh environment, still operate." Li Cong said.

Like plateau areas, the sunshine hours are long, the temperature difference between morning and evening is large, the ultraviolet concentration is high, and individual pipes are also prone to embrittlement, so it is very important to choose anti-high-pressure, anti-corrosion, anti-acid and alkali materials.

"Let's talk freely about how to ensure the temperature of the concrete, which can meet the requirements of the permafrost layer of the plateau permafrost, that is, when pouring the pile foundation, the heat of hydration will not melt the permafrost." Li Cong said.

After Li Cong finished speaking, he looked at everyone, and seeing that no one spoke, Li Cong said directly: "Then start with one, give you five minutes to discuss, and finally the project manager will speak." ”

Everyone talked about it, and soon, five minutes passed, and a project manager said: "We think, first of all, use slag cement with low hydration heat to mix concrete, and appropriately use retarding water reducer, and then we can appropriately reduce the water-cement ratio and reduce the amount of cement under the premise of ensuring the design strength level of concrete." ”

The so-called heat of hydration refers to the heat released or absorbed by a substance during the reaction with water to form hydrate.

A project manager's suggestion is to control from the material, and try not to use or use less for some substances that react with water and release more heat of hydration.

Especially cement, it emits a lot of heat when it melts, if the concrete requirements are met, can the amount of cement be reduced to reduce the heat of hydration of concrete?

A project manager gives many examples, but they are all considered in terms of materials.

Subsequently, the project manager of the second department said: "I also agree with Manager Li's idea, and I think that the temperature of the water can also be reduced, for example, adding ice chips to the mixing water or using groundwater to reduce the temperature; Or the aggregate is washed with water to cool down and avoid exposure to the sun, these methods can be used. ”

In the words of Manager Zhang of the second department, on the basis of the suggestion of Manager Li of the first department, and then on the basis of another material, reduce the temperature of the material before mixing, so that the temperature of the mixed concrete will not be very high, even if the heat of hydration produces the temperature, because the temperature of the concrete is low, the heat will be diluted by the water in the concrete first.

In this way, the effect of reducing the temperature of the concrete is achieved.

In fact, the direction they consider is not wrong, to reduce the temperature of concrete, undoubtedly from the material itself, and the added materials, reduce the heat of hydration, reduce the temperature of concrete.

After the project manager of the second department finished speaking, it was Shucheng's turn to talk about the way to reduce the temperature of concrete.

ps: Tonight's technical department gathering, that's it, good night everyone, thank you for your support, especially the brothers who have been rewarding and fully ordering, suckling pig hereby thanks everyone for their support. (To be continued.) )