Cách mà Người Ta Xây Dựng cột Trụ Cầu nằm sâu dưới Đáy Biển

Hello everyone, welcome back to the 2K Fishing Channel. Nowadays, road construction technology is increasingly developed. Our technology can not only build long bridges across mountains, but also build bridges that cross rivers and seas for miles. So have you ever wondered how people can build bridges that lie deep under the river or the sea? Because building underwater bridges is not as simple as building on land. Today, let's go to the 2K Fishing Channel to find out how people can build bridges that lie dozens of meters under the river or the sea. In theory, in order to build a bridge under the river or the sea, we all have to create a void under the water to make it convenient for construction. And to do this, people will use a system to cover the water, which is called a cover dam. First, we will have to build bridges that lie deep under the river or the sea. These bridges will be transported by boat or ferry to the construction site. In order to build large and heavy bridges, people have to use a special kind of hammer. And then close the bridge deep under the ground below to ensure the stability of the cover dam. These bridges are considered to be the bones of a whole family. When the bridge has been buried evenly under the sea, it will begin to bury the U-shaped iron bars below. Making a line of glass, these metal bars are also called collagen or collagen. In English, collagen is used to cover the ground and water in construction. The bars will be buried deep under the ground. They are connected by a hook on both sides of the collagen. These connections will help the bars to form a tight connection with each other. But they can't prevent the water from penetrating through. Therefore, in some cases, people have to build two layers of bars, one inside and one outside. The purpose of this is to create a space in the middle. People can pour a layer of soil inside to prevent water from penetrating through the collagen into the inside of the cover dam. When the soil has been filled between the two layers of bars, it will now suck the water inside the cover dam out. This work takes less and takes more time. Therefore, people will have to use a layer of collagen and then a water pump outside. But before sucking all the water inside the cover dam outside, they will have to install the insulating systems inside the cover dam. It is the bars that are attached to the walls. This is to ensure that the cover dam does not break the external pressure that is increasing inside when we suck all the water. Here, the work of building a cover dam is almost complete. People will proceed to build the pillars from the inside just like on the ground. When the pillars are completed, just remove the cover dams. In addition to the method of building cover dams above, people also use caissons to build pillars under the sea. And invite you to continue with the Chả Đà 2K channel to find out. Caissons are concrete pillars usually in the shape of a box and hollow inside. The use of caissons in the construction of sea construction is quite popular and effective. It will be installed on the shore and pulled out by a tugboat. In it, the problem of how to hold the caissons in the correct position is the most difficult. Because the caisson box is always shaken by the waves, the pressure of the water pushes the caisson box up and down, shaking and rotating in the opposite direction. Causing the work of building a caisson to meet a lot of disadvantages. Because if it is placed in the wrong position and lying under the water, the movement will face a lot of difficulties. Therefore, the process of caissons is extremely important. When the caisson is successfully launched, people will proceed to draw water out and work like on the ground. Because of its convenience, in addition to using it to build a pillar under the sea, it is also used to make the shores of the dams white. The design of the coastal dam construction in Monaco is built by 21 giant caissons. Each is 28 meters wide, 27 meters high and weighs up to 10,000 tons. It takes more than 3,800 cubic meters of concrete to be able to build these caissons. The super-giant caissons are pulled out of the sea by a tugboat about 200 meters from the shore. Then the water is arranged into a long ring-shaped line surrounding a large area. When it is launched, people will proceed to cover the surface as well as pour sand into it. After that, its final weight is about 24,000 tons. The construction is highly appreciated in terms of scale as well as the innovation in the construction of the dams. The giant caissons act as a wall against the impact of the water, by absorbing the waves hitting the new shore in the dams. The use of caissons to make dams is quite popular in the world. It is both convenient and fast, effective immediately. In addition to the two methods that we have just introduced above, today people also use a very popular method to build dams, which is the caisson method. Depending on the design of the construction, we will choose the method of closing the concrete caissons or casting caissons. Usually, with large trees, the engineers will cast by the caisson method. Compared to other methods of casting, the caisson method can withstand the force many times. The caissons are buried deep into the rock layers below, so the load is also higher. The method of creating joint concrete caissons should increase the strength and the strength of the caissons is increased significantly, helping to reduce the cost of building the caissons for the construction. To cast the caisson method, first you need to prepare the cast iron pipes. These pipes are usually larger than 1.5 meters in diameter. The length depends on the design of the caisson, as well as the depth of the pipe. It acts as a protective wall, blocking water and mud so that the drill can work, as well as casting the concrete later. The pipes are then lowered under the water, built up and cast deep under the mud layer below. After the installation is stable, the hole is drilled inside. The drill will dig the ground inside. The ground is taken out of the hole by the digging tool and the additional pipes are connected to protect the ground from falling into the hole. During the drilling process, after the design is deep enough, the front face of the hole will be cleaned, the drill tool is removed, the steel pipe is inserted into the hole, and the concrete is poured into the steel tube. One of the outstanding advantages of the caisson method is that it is easy to cast in all types of terrain. It is safe and economical. This solution will reduce the casting process, because the caisson is cast directly on the nail. In addition, the method will use the maximum capacity of the materials to avoid waste and reduce the number of nails in the nail. When carried out, it will not cause noise and impact the environment. So you have just finished exploring the video on how people build the undersea bridge. Chả Đá 2K is very happy to share with you interesting knowledge in the field of construction construction. If you find this video interesting, don't forget to give us a like and subscribe to the channel on the right corner of the screen. Thank you and see you in the next videos.