Chapter 382

In fact, it's not as difficult to make a shield machine as many people think, because the world's first shield machine was born at the end of the 18th century two hundred years ago, and it was also hand dug. Compared with today's large mechanized shield machine, there is no high-tech part.

However, although the early shield machine has simple structure and no high-tech place, it is the originator and principle source of modern shield machine.

Chen Xin wants to build his own shield machine. Unless he finds another way to design it from scratch, he can't get around the principle of shield machine, which has laid the foundation more than 200 years ago.

The principle of shield machine is not complicated. The main principle is to build a shield to protect the tunnel and resist the collapse of the tunnel while the TBM is driving forward, that is, to repair while digging.

Of course, with the progress of science and technology, although the principle of shield machine is still the same, some large or super large shield machines no longer need to build "shield" in the process of excavation, they can directly repair the tunnel in the process of excavation, which is convenient and fast.

The basic principle of the shield machine comes from a marine organism, the ship maggot, which continuously digs into the wood and secretes mucus to protect the wood around its body from corrosion and expansion by sea water.

So for Chen Xin, he doesn't need a regular shield machine. In fact, he only needs to make a machine that can dig quickly in the snow, and support the excavated tunnel so that it doesn't collapse before the pipeline construction is completed.

And it's not hard to do either.

Snow is not frozen ice. Although it has a certain hardness, it is easier to excavate than soil. Moreover, the texture of snow is uniform, and there is no complex structure. There is no need to consider the problems of rock strata or other complex geological structures encountered in the process of excavation.

As for the second point, it's easier to solve. At the current ambient temperature, just heat the excavated tunnel wall slightly during the excavation process, so that the snow on the tunnel wall melts and condenses quickly, and an ice shell can be constructed to support and protect the tunnel from collapse.

After all, it's just snow, not any complicated geological structure. It's enough to have an ice shell to support it.

And clear these two points, want to be able to use a shield machine, primary school students may not be able to, but the hands-on ability of some high school students can complete the design.

A cylinder is used as the main structure, in front of which a blade or drill bit like a fan blade is made of relatively hard metal, and a circle of electric heating wire is laid on the shell for melting snow and internal insulation. This thing is basically completed, and can meet the needs of construction.

As for the rest, it's nothing more than to optimize the internal mechanical structure and add some auxiliary functions.

For example, the fan blade or drill bit in front can be shaken by human power, or it can be made into mechanical power by adding a motor. The snow dug can be transported by human power, and it can also be mechanically transmitted. Even Chen Xin is willing to spend some time to make the whole shield machine fully automatic. He only needs to put it into the snow to dig and complete the whole construction by himself.

But Chen Xin was a little hesitant about how big a device he wanted to build.

It's a simple and crude way to build a large tunnel, dig a tunnel directly, and then the workers go in and set up the pipeline. In this way, the machine doesn't need to be too complicated and advanced, so it can dig quickly.

But in this case, the construction speed will be relatively slow. After all, if the construction is large, the heading face will be relatively large, the amount of snow work to be excavated will be doubled, and the construction period will be longer.

As for building a small one, or simply only having the thickness of the pipeline, it will undoubtedly save a lot of work to dig and connect the pipeline.

But relatively, if we build small shield machines, the technical content will undoubtedly have to be improved a lot.

After some consideration, Chen Xin weighed the advantages and disadvantages between the two and chose the small shield machine.

After all, it's the easiest thing for him to improve his technology.

With a multi-functional mechanical arm, it is not difficult to process such a shield machine. It only needs to cut a section of pipe, install a drill bit for tunneling at one end of the pipe, connect a pipe inside to remove the "ice shaving" from the excavation, and finally connect the motor to provide power and power. This thing is even good.

Of course, although this thing is ready and can be used to start work, Chen Xin still needs to give him a small promotion if he really wants to put it into use and rely on it for tunneling.

For example, it is necessary to install a microcomputer on it, so that the equipment can be remotely controlled or programmed to operate automatically.

Chen Xin even considered installing a 3D printer on this little thing, which can print the pipeline directly while driving, and even omit the layout of the pipeline itself.

However, after some consideration, Chen Xin still didn't do so. He just installed a remote control on the small shield machine he made to ensure that he could control the machine forward, backward and stop by remote control.

The final shield machine is like a bullet. The front end of the machine is a hollow drill. It cuts ice and snow through the arc-shaped edge, and then the broken snow is removed through a pipe inside the drill to ensure the smooth progress of the drill.In addition to the pipe, there is a heating ring behind the drill, which is used to heat the snow around the whole shield machine. After the snow melts, it quickly freezes under the influence of low temperature to form an ice shell to stabilize the tunnel.

The power of the whole shield machine comes from a small power motor installed in it by Chen Xin, which is responsible for driving the drill bit and the crawler wheel at the bottom of the shield machine forward, while the power supply relies on a small battery.

After Chen Xin finished the shield machine, he took it to the nearby snow for an attempt, and the experimental results are very ideal.

The drill bit worked very fast in the snow. Chen Xin only allowed it to drill for about three or five minutes, and then drove forward for about two meters. According to this speed, one hour is enough to drive 20-40 meters, which is much faster than relying on manpower.

Seeing that the shield machine he made was quite effective, Chen Xin was satisfied and was ready to let the workers prepare for the construction.

But at this time, some workers asked Chen Xin the question, shield machine really can dig quickly, but how to put the pipe into the tunnel?

The diameter of the shield machine is only a few centimeters thicker than the pipe. It's no problem to put the pipe straight in along the drilled tunnel, but the pipe is not a straight branch, but there is an elbow in the middle.

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