Don’t raise unruly people in extreme cold weather

Chapter 216 Shield Machine

On the design drawing, the original circular town layout of concentric circles was modified into a spiral shape.

The entire town is like an ever-extending spring, with all buildings arranged around spiral streets, and in the center of the spiral streets is a geothermal tower.

"Interesting, does it spiral downward and extend infinitely?" Purficott looked at the modified structure with an interested look in his eyes.

It is interesting to design streets that extend in a spiral shape, because they can continue to extend downwards when necessary.

Unlike a flat ring, if you want to extend and expand, you must take out a new ring under the original ring.

The spiral street structure makes expansion easy. You only need to dig down at the end, which is very convenient for structural extension.

Moreover, another advantage of the spiral structure is that it can also expand on a plane.

Just like a spring extending on a plane, it can also be continuously expanded. The structure is much more convenient than a circular structure.

"With this structure, there is no need to build a large scale at the beginning. Later, it will be much more convenient for the town to expand. All it takes is to extend the streets. Even if you want to expand the second floor, it is the same. A spiral street will do." Purficott quickly understood the benefits of this structure and praised it.

This can indeed greatly reduce the initial investment in urban construction and save time and resources for shelter construction.

Herein lies the advantage of the spiral structure. As long as the geothermal tower located in the center is solved, the extension and expansion of the spiral structure can be left to the residents of the town to solve on their own.

According to predictions, the earth's core will be frozen in the next three hundred years, which means that even geothermal resources will be exhausted quickly in the future.

After all, even the core of the earth is frozen, and it is impossible to pump hot water from the ground.

And there is another very critical point to consider, that is, the ambient temperature is constantly falling.

After all, Purficott does not use the open heating in the original world game, and the efficiency of heat energy utilization is much higher. As long as the underground geothermal resources can keep up, heating in a closed environment is enough.

The geothermal tower originally designed by Purficott is actually a circulating water pump. It is driven by steam to continuously pump hot water from the ground up, while also injecting the cooled cold water into the ground to achieve circulation. The utilization rate of geothermal energy cannot be said to be very high. High, but it can barely meet the usage needs.

"It seems that the only thing that needs to be solved is the geothermal tower." Purficott continued to fiddle with the drawing, and then enlarged the part of the geothermal tower on the drawing.

However, Purficott also considered that as the town expands, a single geothermal tower may not be able to bear the heating demand after the town expands.

Fortunately, this issue does not need to be considered in the short term. What Purficott needs to pay most attention to now is how to build the shelter. Even the heating can be moved back slightly.

As long as the temperature is not extremely low, the underground shelter itself can enjoy the thermal insulation effect brought by the ground.

This is just like the temperature in the cellar itself is warmer than outside in winter, and it is the insulation effect of the ground that is used. According to Purficott's calculations and previous tests at the Eagle Beak Cliff base, as long as the shelter is built to a depth of more than three meters, the indoor temperature can basically be guaranteed to remain at zero.

Of course, this is an ideal state, and specific temperature changes need to be determined based on the actual conditions in different regions.

Just like there are geothermal zones underground in the Eagle Beak Area, and the ground temperature is higher than that in the fjord area, then when building the same underground shelter in the fjord area, you need to build it deeper or add heating equipment to make up for this. temperature difference.

But generally speaking, for every one meter you dig down, the ground temperature will rise by 0.03°C. Without the influence of geothermal resources, usually twenty meters underground will enter a constant-temperature stratum, that is, the ground temperature will not be affected by the surface ambient temperature. .

The ground temperature in the thermostatic layer is usually constant at around 10-20°C depending on the latitude. In the north, because it is close to the North Pole, the temperature basically hovers around 10°C.

Therefore, if you want to be more stable and safe, you only need to start building the shelter at a depth of twenty meters, and at the same time do a good job of insulation and ventilation, which can basically ensure that the temperature is maintained at a temperature that is not very cold.

If it were the original world before traveling, it would not be very difficult to construct at this depth, and various construction machinery would be enough to ensure the smooth progress of the construction.

But for the world that Purficott is now in, if she doesn't interfere, if you want to construct at this depth... it's not that it's impossible, but the entire construction progress will be very slow and difficult.

"In this case, maybe I should design a shield machine that can spiral downward?" Purficott looked at the spiral structure of the shelter on the drawing, and such an idea suddenly came to his mind.

Just do it when you think of it, Purficott quickly pulled over a blank drawing, and then sketched the idea in his mind on the drawing.

The shield machine was hailed as the crown jewel of industry in the world before she traveled through it, but it was actually not a very new thing. It had been invented in the original world at the end of the 18th century for the purpose of digging underground tunnels.

It's just that the shield machine structure at that time was quite primitive, and there was a big gap compared with later shield machines.

In Purficott's view, the structure of the shield machine is actually not complicated. The most critical part is the front-end excavation device, which is not a problem for a master of both alchemy and engineering.

Combining the modern shield machine structures he had seen in the original world, Purficott easily designed a prototype of a shield machine that could spiral downward.

However, this design is only a first draft, not even a prototype.

Because it only has a closed tunneling shield and a tunneling head driven by a steam engine, and has no other structure.

Although the shield machine can basically be used with these two functions, it can only be used for digging soil. If there are problems such as underground water seepage or gas leakage, such a simple shield machine has no solution. fixed.

And a particularly important point is that the shield machine is called a shield machine because it does not only have the function of excavation. It also needs to complete the construction of the pipe wall during the excavation process.

These need to be continuously improved and improved by Perficott in subsequent designs.

(End of this chapter)