Structure composition and development analysis of disaster relief tents1

The tent is mainly composed of a canopy body and a bracket. Due to the high requirements of canvas on the disaster relief tent, it has the function of waterproof and breathable at the same time. Some special-purpose tents also have anti-radiation, anti-biochemical, and night reflection. , invisible function. The canvas must have a breathable function, because the moisture in the air in the tent cannot escape, which will have a greater impact on the people and objects in the tent. The bottom components of the disaster relief tent are composed of 4 long tubes with pins, 6 short tubes, 6 T-joints, 90°The three-pronged joint is composed of 4 parts, which provides a strong guarantee for the bottom of the hood to firmly grasp the ground. The components of the canopy are divided into: 12 long tubes with pins, 6 short tubes, 4 T-joints, 3 cross four-pronged joints, 2 eight-shaped three-pronged joints, 2 left angle forks, 2 right angle forks indivual. The canopy wall is composed of 10 straight pipes without pins. It forms a stable system for the tent, so that the disaster relief tent has enough stability to withstand the impact of strong winds when it is subjected to strong wind direction details. The brackets of disaster relief tents are generally made of metal pipes, which can be divided into: top rod type, folding type and frame type from the overall structure. The ejector type has the characteristics of light weight and quick installation, but the disadvantage is that the wind resistance is poor. Folding bracket is a new bracket structure in recent years, which is mostly used in small tents and has superior performance than top pole brackets. If it is a larger disaster relief tent or cotton tent, most of them use frame-type brackets, which have strong firmness and wind resistance. Therefore, it is widely adopted by tent manufacturers in various countries. Before installing the tent, we must first divide the tent tube into three parts according to the bottom of the tent, the wall and the top of the tent, so that our tent can be installed conveniently and quickly. In the 1950s and 1980s, most of the tents were made of pure cotton canvas. The waterproof and breathable ability was good, but the ability and strength were poor. Generally, a tent can only be used for about a year, and the weight and volume are relatively large. Difficulty in use and transportation. After 1990, polyester-cotton blended canvas appeared. The strength was increased, but the waterproof ability was reduced, and the weight and degree were similar to those of pure cotton. Around 2000, a pure polyester yarn-dyed canvas appeared in China, and its strength was greatly improved compared with the previous two generations of canvas. The weight is 20-30% lighter than that of pure cotton canvas.