Li Qingye did not stay at the Chad branch for long.

The first year of the galaxy, September 20.

Escorted by the Aerospace Fleet, he arrived at the area of operation of the Meroe branch, and in order to avoid being too abrupt, he did not go directly to the Darfur Plateau, but first went to South Meroe.

The Helicarrier slowly passed over the city of Juba, the capital of South Meroe, before landing at an airship airport on the east side.

Marpel, the manager of the Meroe branch, had been waiting at the airport for a long time.

As soon as Li Qingye stepped down from the airship, he felt a wave of heat: "This place is really hot!" ”

Sanchibada? Laiyar hurriedly took a small electric fan to blow the wind on him.

"Chairman, welcome to the Meroe branch, I am Mapel, responsible for the company's operation and management in the region." Mapel is not purely black, but a mulatto on the island of Mada, with a Javanese skin tone.

Li Qingye commented with a smile: "This city is built well!" ”

"It is our honor to be in the eyes of the chairman, chairman, this is the industrial directory of Juba City, please take a look."

Marpel held a beautiful booklet in both hands.

Li Qingye took it and flipped through the booklet, which was full of various projects and industries that the company had invested and built in the local area.

For example, the Juba Dam, which is under construction, is the core city of the upper reaches of the White Nile, and the river drop here is very large, which is very suitable for the construction of the dam.

He closed the booklet: "Let's go to the air and rail company!" ”

"Yes, Mr. Chairman."

The convoy drove slowly down the road.

Juba City is a highland city, with an altitude of about 500 meters above sea level, and the temperature is relatively moderate, at least compared to other low-altitude cities in the area, it is not too hot to be outdoors.

After the power of Homo sapiens came here, it invested in a lot of infrastructure.

Due to the late-mover advantage, many of the new technologies developed by Homo sapiens in the later stage are reflected in the infrastructure construction of the city.

For example, the green carpet created by genetic recombinant technology covers almost the entire surface of the city's buildings, making Juba City look almost emerald green.

This green blanket can absorb water molecules from the air through photosynthesis, and its fleshy stems and leaves resemble succulents, and have a strong ability to store water.

The green carpet has the ability to regulate air humidity, oxygen and carbon dioxide concentration, absorb harmful gases, and can keep the indoor air temperature between 26~28 degrees Celsius.

And because the whole city is covered with a green carpet, the outdoor temperature in the whole city of Juba is maintained between 20~35 degrees Celsius.

Li Qingye felt the heat wave rolling in at the airport just now, and that was because there was no large-scale green carpet in the area to regulate the humidity and temperature.

Li Qingye could see the situation in the streets and alleys along the way through the car window.

In addition to the natives, there are also a lot of East Asians with obvious skin tones, or brown Southeast Asians, white North Africans.

The minibus walked around the neighborhood and then came to the outskirts of the XC district.

"Chairman, we're here." Marpel said as he opened the door.

After Li Qingye came down, he saw a huge factory, and there was a large station on the side of the factory.

However, the station is not on the ground, but in mid-air, and the track is also in mid-air.

This is the product of the Meroe Air Rail Group – the Composite Overhead Railway.

Li Qingye entered the production base.

Fan Haibo, the person in charge of the factory who received the notice, ran over sweatingly: "Huhu...... Chairman, welcome to our factory inspection, I am Fan Haibo, the factory director. ”

"Don't be nervous, I'll just take a look, I heard that you are building the Southern Meroe Plateau Railway, how are you doing?"

Fan Haibo, who secretly breathed a sigh of relief, hurriedly replied: "Chairman, we have been building an 86-kilometer experimental line, and the current operation is good. ”

Immediately after that, Van Haibo gave a detailed introduction to the technology of their factory.

The construction and operation of this kind of overhead railway are somewhat different from that of traditional railways.

Specifically, the material performance is powerful, and there is enough material performance support to play this kind of overhead railway.

The construction process is very interesting, starting with the synthesis of a 10-meter-diameter hollow pipe from a biosynthetic aluminum-silicon material, which is 3.27 times stronger than ordinary steel.

After the one-time synthesis of the pipeline, the construction airship that was transformed from a transport airship was used to pull the pipeline weighing 8,400 tons and a length of 300 meters into the air.

Depending on the soil and rock formations below, the flight altitude is randomly adjusted, aiming at the target area, and then throwing the pipe directly down from a high altitude.

Under the influence of the earth's gravity, this huge pipe will instantly plunge into the ground at a depth of 240~280 meters.

In the wall of the pipeline, there is a small pipe system called "capillary", and the construction personnel can inject special genetic recombinant bacteria to integrate the pipe with the underground rock soil to enhance the comprehensive load-bearing capacity of this column.

Usually one node will drive 4~6 hollow pipes.

Then, according to the height of the track overhead, the factory will customize a batch of hollow pipes that are smaller than the diameter of the ground pile pipe and can be inserted into the inner diameter of the ground pile pipe, but this kind of hollow pipe is sealed at both ends.

The same airship is used to insert a smaller hollow pipe into the ground pile pipe.

Due to gravity, the small pipes will squeeze the soil and rock of the ground pile pipes, causing the soil and rocks to become more and more compact.

Of course, the small pipe is limited by the ring, which can avoid the pipe falling too much.

After the columns were built, the next step was the same modular node equipment, which could connect the four columns.

Normally, the distance between each node will be about 10 kilometers, and the part between the nodes is connected.

It is a special nanoalloy previously used in the Dandelion project, which is made of a cable that connects two nodes in a set of four.

With a diameter of only 3.4 cm, the rope has a very strong load-bearing capacity.

The construction crew will then arrange the light alloy sheets and rails on the cables.

The rails can run high-speed load-bearing railways, and under the rails, suspended trains can be used to form dual-purpose rails that transport goods above and passengers below.

In addition, due to the good material performance, between the two nodes, 4 horizontally parallel rails are arranged, which is only the minimum utilization rate.

If the route in the area is busy, you can also consider adding a three-dimensional line, and the maximum arrangement is sealed for 4 layers up and down, 4 horizontal rails on each floor, a total of 16 rails.

And each track can be used up and down, which is equivalent to running 32 tracks.

The reason why the Meroe Air Railway Group made this kind of railway.

On the one hand, there are too many nature reserves in Africa, and to build railways on the ground, you have to cross nature reserves and wildlife habitats.

On the other hand, it is because Africa's infrastructure is so bad that building surface roads and railways is not only costly, but also very troublesome.

For example, there are vast deserts, tropical rainforests flooded twice in three days, and a large number of uninhabited mountains and hills.

As for the underground railway, of course, the company is also engaged in it, that is, it is more afraid of the super mantle plume and the Numian aquifer under the ground in Africa, so it is more cautious about the underground railway project.

After thinking about it, the Meroe branch decided to build a lower-cost overhead railway.

Of course, this cost is for Homo sapiens, and if it were other forces, the cost of overhead railways would be higher than that of surface railways.