Ways to build
The Great Wall defense engineering building has accumulated rich experience in the construction process of more than two thousand years.
First of all, when Qin Shihuang built the Great Wall, he summed up the important experience of “using danger to control the blockade due to the topography”. Then Sima Qian wrote it into Shi Ji “Historical Records”. Later, every dynasty built the Great Wall in accordance with this principle, which became an important basis for military defense.square steel tubing prices
Every pass is built between two valleys, or at the turning point of a river, or at the place that must be passed between rivers, so as to control dangers, save manpower and materials, and achieve the effect of “One man can hold out against ten thousand”.
As for the construction of city walls, we should make full use of topography, such as Juyongguan section of the Great Wall and Badaling section of the Great Wall, which are built along the ridge back of mountains. Some areas are very steep from the outside of the city walls, while the inside is very gentle, which has the effect of “easy to defend and difficult to attack”.