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Precautions for Using Prestressed Concrete Steel Strand

Precautions for Using Prestressed Concrete Steel Strand

Issue Time:2021-08-18
the precautions for the use of prestressed concrete steel strands

The diameter of the prestressed concrete steel strand is generally between 9.53mm-17.8mm, and it is widely used in guyed wires, load-bearing cables, several sections of overhead ground wires, and structural cables of bridges. It is used in various bridges, construction, and other engineering projects. Indispensable equipment. The following are the precautions for the use of prestressed concrete steel strands.
 
1. The prestressed concrete steel strand must be kept away from high temperature and high heat environments during use. Heating will cause the deformation of the steel wire, which will reduce the performance. We should also eliminate welding and other operations because it is easy to cause welding during the tensioning process. Broken wire at some point. When cutting steel strands, you should use a toothless saw, gas welding cutting and other methods are easy to damage the surface of the steel, and local heating will affect its performance.

2. Welding is strictly prohibited during use by the steel strand manufacturer, because the strength of the solder joint is much lower than the strength of the steel itself, and it is easy to cause wire breakage at the solder joint during tension.

3. When the prestressed concrete steel wire adopts cyclic reinforcement, its bending radius shall not be less than 3 times the diameter of the steel wire.

4. The steel strands packaged in rolls without shafts should be tapped from the inner ring in the vertical state, and the drawn strands should be spring-shaped and automatically straightened. Tap direction: the spiral direction of the spring shape after tapping is consistent with the twist direction of the stranded wire.

5. The twist direction of the steel strand is generally left twist. When using the right twist, it should be noted in advance, otherwise, it will directly affect the coordination with the anchor.

6. The quality of the prestressed steel wire head is not directly related to the quality of the steel wire itself, but too high strength will not be conducive to the quality of the steel wire head.

7. The prestressed steel strands are cut and bundled in the prestressed strand production area of the prefabricated yard and are classified and stacked according to the design number. Before the pre-stressed construction of the beam body, it shall be transported to the platform to be constructed to be bundled and stretched.

8. The prestressed concrete steel strand construction should adopt a through-core double-acting jack, and a jack with a self-anchor function should be used for the overall tension or unwinding; the rated tension of the tension jack is 1.5 times the required tension, and should not be less than 1.2 times. The pressure gauge used with the jack should be an anti-vibration product, and its large reading should be 1.5 to 2.0 times the tensile force, and the calibration accuracy should not be less than 1.0.

9. Prestressed steel strand tensioning equipment should be used in conjunction with anchor products and should be calibrated, inspected, and calibrated before use.

10. Under normal circumstances, the prestressed steel strands should be stored in a dry warehouse, avoid direct contact with the wet ground. If it is necessary to place it in the open air, sleepers should be erected on the ground and covered with waterproof equipment such as tarpaulins. In special cases, rust-proof packaging can be used directly when ordering.

If we do not pay attention to the above matters during the use of the prestressed concrete steel strands, which are likely to damage the structure of the prestressed concrete steel strand itself, thereby affecting the performance. If you want to know about prestressed steel strands or other concrete products after reading the above, you can get a comprehensive solution by contacting us.

As an experienced prestressed concrete product manufacturer, we have a professional production team and a strict quality inspection system. We have carried out comprehensive quality control from product design to export and can provide customers with safe and high-quality products. At the same time, we will provide thoughtful one-stop service and effective solution technology according to the diverse needs of customers. If you are interested in our prestressed concrete steel strands, please contact us immediately!

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