What are the uses of high-strength prestressing steel strands?

High-strength prestressing steel strands are widely used in many industries. In the last century In the 1950s, prestressed concrete was put into practical use. However, the basic principle of prestressing is not only applicable to steel strands, but has been applied in many aspects in ancient times. An iron hoop is a good example. It applies a certain amount of pressure to loose wedge-shaped plates to form a barrel, which withstands sufficient lateral pressure. This is an early principle of prestressing. What is the use of steel strands?

The overall structure of high-strength prestressing steel strand is of a torsional type, and its raw material is steel wire. Of course, this material is an improved product according to different requirements. Generally speaking, some commonly used methods for improving steel strands include adding zinc coating, processing zinc-aluminum alloy coating, spraying epoxy resin, etc. These methods can effectively improve the physical and chemical properties of steel strands and greatly expand the application range of steel strands. We can see that steel strands are often used as load-bearing ropes, inclined cables, and reinforcing cores. When erecting power transmission lines, in the actual construction process of cable sealing on both sides of the road, it is necessary to process the structural cables of the building structure. Steel strands can generally be seen. As far as we know, steel strands have not yet been used in bridge water conservancy, construction, geotechnical engineering, etc. Due to the wide range of applications of steel strands, different fields have different requirements for various characteristic strengths of steel strands. Therefore, in the normal development of steel strands, various performance and characteristic steel strand products are gradually classified to meet the needs of different industries and fields. Currently, there are many prestressed steel strands and galvanized steel strands. The former has particularly prominent mechanical strength, and it is more flexible to increase or decrease the number of steel strands. The latter, due to its excellent coating, has excellent corrosion resistance and oxidation resistance.

What are the main advantages of using high-strength prestressed steel strands?

The main purpose of this article is to overcome the shortcomings of low tensile strength of concrete and make full use of high-strength steel. When the tensile stress reaches 250 MPa, and the crack width reaches 0.2-0.3 m, the durability of the component will decrease, and it is not suitable for high-humidity and corrosive working environments. The role of prestressed steel strands is to apply prestress to the component before the component is stressed, thereby controlling the tensile stress level of the component, or even making the component in a compressive state. In order to avoid early cracking of reinforced concrete components, high-strength steel and high-strength concrete should be fully utilized to improve their performance and durability.

2. Due to the effective use of high-strength steel strands and rapid-setting agents, prestressed concrete steel strands can be made into long and thin load-bearing structures with larger spans and lighter self-weight than ordinary reinforced concrete;

3. Prestressed steel strands can improve the service performance of concrete structures, effectively prevent concrete cracking, or at least limit the crack width to a harmless range, and improve the durability of the structure;

4. Even if a partial prestress is applied under the influence of load, the deformation of the structure can be controlled to a smaller state; 5. As long as the steel bar strain capacity is less than 0.01%, the overload crack problem can be chosen to be closed again after unloading.