The progress of human civilization is accompanied by the development of the use of metals. From the earliest Bronze Age to the widespread use of iron, carbon steel, aluminum alloys, and rare metals, almost every human civilization can be seen. The leaps are all related to metal.
Physical activity itself is also accompanied by human beings. The use of metal products in the sports industry has been very extensive. Taking the stadium as an example, the traditional sports stand is almost the same as reinforced concrete territory plus plastic seats. This type of sports stand model, which has been used for more than a century, is constantly being changed. Until recent decades, the stands of steel structures have emerged in sports events and performing arts events, and are used by more and more operators.
The use of the steel stand (green frog stand) is a major sign of the striding of sports facilities, but the problem is that although the stands of pure steel structure are impeccable in terms of strength, they have problems in transportation and handling. Too much, because it is too bulky, it is very laborious to transport, and the logistics cost is greatly increased, so that the event organizers agonize. In addition, the largest natural enemy of steel structures is the rust of water. When the steel stands are used outdoors, it is inevitable to encounter rain. As long as the paint on the outside of the steel frame is touched off, the paint slowly begins to corrode, posing a great threat to the safety of the stands. In order to prevent rusting of the steel structure shelves, general outdoor steel stands need to be treated with galvanizing. However, due to the environmental pollution caused by the galvanizing process, many galvanizing plants are closed, and some are underground. In order to deal with the sewage, the cost of galvanizing in a regular galvanizing plant has gone up, which has greatly increased the cost of the stand to the steel stand. As a result, an aluminum alloy stand that can replace the pure steel structure is increasingly used.
The typical feature of aluminum alloy stands is lightness, which makes it easier for users or event organizers to move. Because aluminum alloy seats are light, safety accidents due to heavy pressure are also reduced. Although the aluminum alloy stand is light, it can fully withstand the normal weight in terms of strength. In addition, the advantages of the use of aluminum alloy seat outside is obviously obvious, because it is not afraid of rust.
When it comes to aluminum alloy stands, we have to talk about some of the physicochemical properties of aluminum alloy materials. Aluminum alloy processing methods can be divided into two types of deformation aluminum alloy and casting aluminum alloy:
Deformed aluminum alloy can withstand pressure processing. Can be processed into various forms and specifications of aluminum alloy. Mainly used for the manufacture of aviation equipment, doors and windows for construction. Deformed aluminum alloy is divided into non-heat-treatable aluminum alloy and heat-treatable aluminum alloy. Non-heat-treatable type can not improve the mechanical properties through heat treatment, can only be achieved through cold deformation processing, it mainly includes high-purity aluminum, industrial high-purity aluminum, industrial pure aluminum and rust-proof aluminum. Heat-treatable aluminum alloys can be improved in mechanical properties by quenching and aging and other heat treatment methods. It can be divided into hard aluminum, wrought aluminum, super hard aluminum and special aluminum alloys.
Cast aluminum alloys can be divided into aluminum-silicon alloys, aluminum-copper alloys, aluminum-magnesium alloys, aluminum-zinc alloys, and aluminum rare-earth alloys according to their chemical composition. Among them, aluminum-silicon alloys have eutectic silicon aluminum alloys, eutectic silicon aluminum alloys, and a total of Crystal silicon aluminum alloy, cast aluminum alloy used in the as-cast state.
Some aluminum alloys can be heat treated for good mechanical properties, physical properties and corrosion resistance.
The 2008 Olympic Torch "Lucky Cloud" is an aluminum alloy.
Typical Mechanical Properties of Aluminum Alloys | ||||
Aluminum alloy grade And status | Tensile strength (25°C MPa) | Yield strength (25°C MPa) | Hardness 500kg force 10mm ball | Elongation 1.6mm (1/16in) thickness |
5052-H112 | 175 | 195 | 60 | 12 |
5083-H112 | 180 | 211 | 65 | 14 |
6061-T651 | 310 | 276 | 95 | 12 |
7050-T7451 | 510 | 455 | 135 | 10 |
7075-T651 | 572 | 503 | 150 | 11 |
2024-T351 | 470 | 325 | 120 | 20 |
Of course, we have to admit that the strength of aluminum alloys is inferior to the strength of high-quality steels, especially in sports stands, performing arts events and other activities. The safety of the stands is the first place. Therefore, in terms of structure, high-quality steel structures are required for places where special load-bearing conditions are required, and aluminum alloys are particularly preferable for places where the load-bearing area is limited.
The Guangzhou Green Frog's aluminum stand can be realized from 1st to 20th floor. For some basketball halls and badminton halls, the number of general audiences is relatively small. The use of a single-layer aluminum alloy stand or a three- or four-tier aluminum alloy stand can be used. The three-storey grandstand can seat 30 people, and the 4th floor can seat 40 people. Especially when the casters are installed on the sides of the stands, the movement of the stands is more convenient. Make it a mobile stand. For some outdoor sports events, the high-level aluminum stand can better reflect its advantages and can be up to 20 stories high. It can fully meet the needs of the competition for the number of large audiences.
We now rarely see outdoor activities using bulky cement stands to fix the stands. The cement stand is not only bulky, it is not cheap, and it is inconvenient to disassemble. It can be said that the use of aluminum stands can reduce the cost of sports stand facilities by 30%-50%. Today, it is a good choice to promote the establishment of a conservation-oriented society.
Maybe one day, the sports stand is the world of aluminum alloy stands!
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