Hello everyone, handsome men and beautiful women in the circle, on this special day, Xiaoquan first took out the treasure map at the bottom of the box to wish everyone a happy Valentine's Day! If you have a crush, it is recommended to forward this picture to your crush. If you have no crush, it is recommended to forward "Marry a young man who works in the port, it's not a loss" to your circle of friends. We port people are just romantic!

Closer to home, when we observe this picture, it is not difficult to find that the containers on the ship are stacked vertically. Of course, not only this ship, but all container ships are stacked vertically. Why is this so?

This is not easy. When I first thought of this, the answer immediately popped up in Xiaoquan's mind: because when a container ship berths at the dock, the hull is parallel to the shoreline. If the container is stacked horizontally, the quayside crane will grab the container Finally, it has to be rotated 90 degrees in the air and put it on the truck on the shore. Isn't this somersaulting by blind people?

However, after reading the science popularization in Captain Li’s notes and the popular answers from netizens, Xiaoquan found that he was still too young too simple. There is so much knowledge about why the containers on the ship are stacked vertically instead of horizontally!

The first is the efficiency issue mentioned at the beginning of the article. When the containers are stacked horizontally on the ship, the position of these containers will be perpendicular to the shore after the ship docks. First, the width of the container is only 1/5 of the length, and the quay bridge needs at least 5-6 times more movements to unload all the containers; second, after the horizontal stacking, the container on the ship is in a vertical state with the truck on the shore, whether it is Turning the quay crane spreader 90 degrees or turning the truck in a different direction will reduce the operating efficiency.

The second point is the volume issue. Although the size of the container is the same whether it is placed horizontally or vertically, due to the limited width of the container ship, vertical stacking can make more reasonable use of the space area and accommodate more containers.

The third point is the safety issue. Due to the uneven weight of the goods in the container, once encountering wind and waves at sea, the horizontally stacked containers are more likely to have the goods move and the center of gravity will shift. In severe cases, it will even cause the container ship overturned. In addition, when stacked horizontally, the goods in the container have more room to move left and right, and the kinetic energy is also greater. After a gust of wind and waves, the goods may have rushed out of the box door and "run away from home".

The fourth point is the lashing problem. The front-line staff at the terminal know that apart from the locks at the four corners of the container to make it tightly interlocked with other containers, there are also special lashing locks at the door. When stacking vertically, you only need to Just tighten the tie rods at both ends. If you want to change it to horizontal stacking, not only will it increase the difficulty of tying, but you will also need to increase corner fittings, which will increase transportation costs.

The fifth point is the mechanical problem. When a container ship encounters a strong wind on the sea, the cross-section of the vertically stacked containers is smaller, and the resistance they receive is also smaller, which is conducive to the full speed of the ship, while the horizontally stacked containers will be affected. More drag, lower boat speed, more energy consumption.

The above five points are why the containers on the ship should be stacked vertically. In fact, in order to ensure the maximum stability of the ship's center of gravity, not only the containers must be stacked vertically, but all the horizontal pumps and axles on the ship are also placed vertically, ensuring the safety of the crew and the ship has always been the first priority of maritime transportation .

Finally, the small circle also wants to test everyone. There are two container stacking methods in the dock yard: parallel layout and vertical layout. Why is this so? Please give your answer in the message area.