Chapter 248 Lever Ramming Car (Please vote and subscribe)
[Thanks to 'Moon's Love' for the big reward. I haven't checked the backstage these two days, so I know it a little late. Sorry]
After the houses of all the residents of the Han tribe were settled, Luo Chong arranged new tasks for these freed-up construction workers to build large public facilities according to the current early and late demand.
It is now the last month of summer. The second season of rice in the Han tribe is planted at the beginning of the third month. In other words, in another month, the rice of the Han tribe will have a good harvest. Therefore, according to the current situation, building a granary is the top priority.
After the construction of the granary is completed, we can free up our hands to build a breeding farm so that the animals raised by the Han tribe can live in it before winter and ensure the survival rate of livestock over the winter.
The storage area is built in the southeast corner of the city. This place is close to the fields, which will save trouble for transportation, and it is not facing the city gate. Even if the city is attacked, the storage area is not easily destroyed, which can ensure the supply of food and prevent the whole city from starving.
After choosing the location, Luo Chong began to plan the specific construction. The city area with a side length of 110 meters is nearly the area of two football fields. It is impossible to have only one warehouse in such a large area. Several warehouses must be built. What if a fire occurs? All the food will be burned. As the saying goes, eggs cannot be put in one basket. This is the reason.
The square area with a side length of 110 meters is divided into 12 warehouses. Each warehouse is 30 meters long and 21.5 meters wide. The east-west direction is the width of the warehouse. There are four warehouses in a row, and three eight-meter-wide roads are left in the middle. The north-south direction is the length of the warehouse. There are three rows in total. A ten-meter-wide road is left between each row, so that two large trucks can drive easily and facilitate the transportation of goods.
Although 12 warehouses are divided, such a warehouse is still very large and still difficult to build. The length of the warehouse is 30 meters, but this is not a problem. In terms of load-bearing, bricks can be directly used. Small bricks are not strong and can be directly replaced with large bricks for building the city. The most difficult part is actually the width of the warehouse.
21.5 meters. Even if the big bricks used to build the city are used, the thickness of the single wall can reach 40 centimeters, but the span is still 20.7 meters wide.
The structure of the warehouse must be as simple as possible, and it needs to be very spacious. It is best to have only four walls and a roof. In this case, there will definitely be no load-bearing walls in the middle of the warehouse. Therefore, if you want to erect a roof for such a wide house, you can only erect several rows of columns inside the house to support the beams, which are what we commonly call roof beams.
Several columns have to bear the weight of a roof of more than 600 square meters. The burden can be said to be very huge. It can only be supported by logs with a diameter of about one meter, and there are still many logs. However, the Han tribe has never cut down such a large tree.
First, there were no suitable tools, and second, it was very difficult to transport such a large tree from the mountain. The entire logging team had been picking trees with a diameter of less than half a meter, so there was no way to use logs as the main beams. They had to use other materials. Luo Chong thought about it and finally decided to use bricks. He directly used bricks to build a square column with a side length of 80 centimeters.
The height of the warehouse wall reached seven meters, and the top was eleven meters high. The roof was still a sloped structure, but this time it changed from two slopes to four slopes, which converged from four directions to the middle. This huge building was built for the first time by the Han tribe. Its structure was not complicated. From a structural point of view, the warehouse was simpler than the residence, but it was very huge.
However, this was also an advanced work of construction skills. The tribesmen needed to use these twelve warehouses to practice and accumulate experience in building large buildings. In the future, it would be possible to build larger and taller teaching buildings. Food is eaten one bite at a time. It is not even worth thinking about asking these people who have just learned to build bungalows to build three-story buildings.
The most critical point in constructing a large building is that the foundation must be solid and must be able to bear the weight of the building, otherwise collapse will be inevitable. Regarding this point, Luo Chong also gave specific indicators during the construction.
The foundation trench of the wall should be dug to a depth of at least 1.5 meters, and then the foundation should be compacted, at least half a meter, so that the foundation trench can reach a depth of two meters.
After the foundation trench is dug, a layer of limestone should be laid underneath, the main purpose of which is to prevent moisture, and then the foundation should be built
. The foundation is built with bricks for building a city in a T-shape, one vertical and one horizontal, so that it can reach a width of 60 centimeters. The wall above the ground is two bricks arranged side by side, which can reach 40 centimeters. When building the wall, a pile should be built every five meters to increase the force-bearing capacity of the wall, otherwise the wall of dozens of meters is easy to fall.
After explaining the specific construction steps, nearly a thousand tribesmen also got busy, digging the foundation, tamping the foundation, and transporting bricks and soil. They were all busy. As long as one such warehouse is built, it can currently meet the grain storage needs of the Han tribe.
And because there were so many people, the construction progress was quite fast. It took only three days to dig out a 1.5-meter foundation trench, and then the foundation was repeatedly laid. However, the progress of laying the foundation by manpower was too slow, and the foundation was not solid. After all, the weight that can be lifted by manpower is limited. Just think about how heavy the rammer can be.
In order to save more effort and improve the quality of the foundation, Luo Chong asked the carpentry team to develop a rammer that uses the principle of leverage.
The principle of this thing is very simple. First, make a frame with wooden squares, and then install four solid wooden wheels, mainly for load-bearing. Then, a half-meter thick and two-meter long log is hung in this frame. The top of the log is hung with a rope, and then a long stick is connected to it as a lever. A rope is also tied to the other end of the lever. A few bricks are stacked on the other side of the log frame as counterweights.
When working, the tamping cart is placed on top of the foundation trench, with the wheels straddling both sides of the foundation trench. A huge log tamping hammer is suspended in the foundation trench and fixed by the frame of the tamping cart. Two people push the cart on both sides of the tamping cart, and two people at the back pull the rope of the lever. When this side is pulled down, the tamping hammer will be lifted up. When the person lets go, the tamping hammer will naturally fall, completing a tamping.
The invention of the tamping cart made tamping much easier and the progress was much faster. A log tamping hammer that is half a meter thick and two meters long weighs several hundred kilograms. If you want it to be heavier, you can soak it in water one day in advance, so that the weight of a piece of wood will double, and the tamped foundation will be strong enough. Every time the hammer is hit, the soil can be pounded at least 20 centimeters deep. After two or three times of tamping, the foundation will meet the standard.
Let me talk about the ramming car. I am too lazy to draw a picture. If you have trouble understanding it, you can imagine it as a seesaw placed on a mobile support. A tree stump is hung on one end of the seesaw, and a rope is on the other end. People can pull it up and down (leverage saving arm principle, the longer the lever at one end of the fulcrum, the less effort
it saves). The mobile support is the body frame, and the seesaw is the lever. It's roughly like this╮(￣▽￣)╭
(End of this chapter)
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