Chapter 13 Chapter 12 Attack!Underground chariot!

Generally, the machines appearing in special photos or cartoons improve the performance of real technology, such as airplanes, cars, submarines, etc. The only exception is the setting of "underground combat vehicle", because this "use The idea that a big drill bit is going underground” has no such thing in real civil engineering technology (such as subways, etc.)!It can be said to be the most "non-scientific" mechanical setting. Since the jet gopher tank in the British special film "Thunder Bird (Thunderbird)", the super special police in "Superman VII" also has the appearance of magma submersible vehicles, and then the "underground tank" has become a world of fantasy science A must-have item for the righteous side, whether it is for rescue or to repel underground monsters, it uses its huge drill bit to break through the hard rock plate and advance underground.

However, if there is such a thing, why are those subway, MRT, tunnel projects so troublesome? After digging for a long time, I can't dig it well. Wouldn't it be done with an underground tank? Next, let's take a look at "Why are there no underground tanks in the world"? First, this kind of thing will not drill into the ground at all. Once the drill bit penetrates the ground, it is the car body itself that will turn instead of the drill bit?The reason is very simple, there is nothing to fix the body!It's like holding the fan blades of a stopped electric fan with your hand, and when you turn on the switch, the fan blades will not turn, and the electric fan itself will turn in the opposite direction.Yes, the Jet Gopher in the Thunderbirds has steel tracks on the body to prevent the body from turning around, but that kind of little thing doesn't do much.When this reversal is reversed, the cockpit of the underground tank becomes a juice machine, and the people in it... The underground tank "Bermida II" that appeared in the drama "Superman Glory" has two left and right side by side. The big drill bit, can this prevent the reverse rotation of the car body?No, more dangerous! ! !

Icon: The two drill bits of the Belmida II, as long as one of them drills into the rock plate or hard ground, the drill bit will be fixed and become a fulcrum, turning the whole car body over!This is like a tortoise turned over, the wheels and tracks are useless, the whole car can't move, waiting for a monster to kill... Even if the two drills touch the ground at the same time, this chariot only drills into the drill part. The ground, and then can not move.To prevent the reverse rotation of the car body, it is necessary to make the car body also have the output to counteract the reverse rotation.But one that can drill into rock and advance?The drill bit must have tens of thousands of horsepower, and the car body must also have an equivalent force to prevent reverse rotation; this kind of output cannot be achieved by non-jet engines or rocket engines.However, jet engines are useless in the lack of air, and rocket engines are difficult to control (Arslan Note: This refers to solid fuel rocket engines, because Japan is more advanced in this area.), for drilling It is quite unsuitable for entering soft and hard strata.

The second problem is "hot"! ! The drill bits used in drilling for oil are made of man-made diamonds and require a large amount of water for cooling.Therefore, in order to reduce frictional heat, water pipes are indispensable.Furthermore, in addition to frictional heat, the heat energy of the engine itself is also considerable. Generally, only 20% of the energy of an engine is converted into kinetic energy, and the remaining 80% is converted into heat.As far as the underground tank is concerned, there is neither ventilation nor heat energy absorbed from the surrounding rock plates and soil (the heat transfer coefficient is very low), and a scorching hell will be formed inside the vehicle!

It is even more unfeasible to use a cold room to reduce the temperature inside the car. It just discharges the heat to the outside.In addition to installing dozens of layers of heat insulation materials on the inside of the cockpit, the whole body is wearing heat insulation clothing for firefighting (reminiscent of EVA's D equipment again?), and holding an icicle on the body to cool off...even if it is to save lives Or destroying underground monsters, this kind of working environment that seriously violates the Labor Standards Law... Who wants to drive this thing? The third question: Where should the excavated soil be piled?

Don't forget, the volume of the excavated soil will increase several times due to the mixing of air, so it is absolutely impossible to put it in the tunnel behind!In subway or tunnel engineering, there must be pipelines to transport the excavated waste soil continuously. However, the underground tank does not have such equipment, and it will be buried alive by the soil dug out by itself if it advances less than a few meters. Icon: Before the depth of the underground subway is dug, it becomes an "automatic coffin" underground chariot... To avoid this kind of thing, a large number of backup troops are needed to transport the soil out with conveyor belts.This is no longer a strategic move, but civil engineering!Rather than handing it over to a justice organization, it is better to give it to a construction company... And the heat and loud noises of the Bimei volcanic crater are not a suitable working environment for humans. If a large number of automated working machines are to be used, heat-resistant ones must be designed first. Ceramic material and electrical system, and then mass-produce this kind of robot... It seems that it is not what the scientific special search team should do to do something that seriously affects the economy and industry in order to defeat an underground monster?

Addendum: Correct settings for "Underground Vehicle" (?) First of all, don't put the engine on the vehicle!The engine placed on the ground uses a flexible shaft (a flexible shaft, a strong metal tubular shaft that can be transmitted even if it is bent, is currently under development.) to transmit power to the drill bit under the ground.There are also pipes for cooling water, and they are made of materials that can absorb noise and vibration.There will also be many conveyor belts and trolleys behind the car body to transport the earth and rocks to the ground. Icon: This... should be called "Underground Tram", right?However, another advantage of this "subway-type underground combat vehicle" is that once the pursuit of the monster fails, it can be pulled back with a tow... However, this "correct" underground combat vehicle still has a problem.That is "slowness". If you can advance a few meters in a day, you should laugh.But according to the setting, the speed of underground monsters in the ground is very fast ("Diton" has a speed of 17㎞ per hour, "Gouka" has a speed of 30㎞ per hour, "Youtong" has a speed of 120㎞ per hour, and "Gorton" has a speed of 150㎞ per hour ㎞, "Bagos"

It's 180㎞ per hour... They are all very fast, but from the screen, the speed of these monsters is very slow after they hit the ground... Strange? ), then this kind of underground tank is useless at all! Having said that, this underground chariot has another use, that is, its cooling water is quite hot and rich in underground minerals, so it can be used as a hot spring!The headquarters of the underground tank also runs a hot spring hotel, which is a good source of funds... But the problem of dumping the waste soil dug up every day may be difficult to solve... Next time preview: Goodbye, Earth.This is the space battleship Yamato... In order to save the earth, it is heading for a round trip of 296,000 light years!But is it all about living in zero gravity along the way?Woo...:~~ Please read the next chapter "Artificial Gravity Generator"!