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Types and usage of spiral strand ropes

Types and usage of spiral strand ropes

A spiral strand is a composite of multiple layers of helically twisted steel wires. Layers are spun in opposite directions providing constructional and torque stability. The use of high strength steel wires makes it a good candidate as tension member in static applications.

Open spiral strands are suitable for metal or resin socketing and for swaging socketing.

The mechanical properties of the prestressed concrete spiral strand ropese are the maximum load, elongation, yield load and slowdown rate. Its experimental effect must conform to the numerical value of the rules.

For the same raw material spiral strand ropes, the total tensile resistance of several small-area steel wires can be greater than the tensile resistance of steel bars of the same area; the steel bars are not easy to bend, and the steel leads are soft and easy to operate. The force of steel cable is more reasonable than that of steel, but the steel wire rope is loose and difficult to operate, and is mostly used for super-large load-bearing cables. Since Spiral strand ropes are more mechanically integrated, they are often used for spiral strand ropes on top of prestressed projects. spiral strand ropes is a steel product composed of multiple wires. The surface of carbon steel can be added with Zn or Zn95AI5, conventional or HDPE Sheathing; Tensocoat etc. as required.


About the concept of spiral strand ropes: The steel wire is mechanically twisted at one time according to the rules, and it is called steel strand. According to the types and usage of spiral strand ropes,it's classified into galvanized spiral strand ropes, spiral strand ropes for prestressed concrete, and aluminum strands.


When the stranded wire is prestressed and tensioned, the exposed part of the stranded wire is mostly wrapped by the anchor rod and the jack, so the tension and elongation of the stranded wire cannot be directly measured as the spiral strand ropes, but only the piston stroke of the tensioning jack can be measured. To calculate the tension and elongation value of the strand, but the bearing capacity of the strand must be 4-6 times the total traction force. Stress corrosion occurs when the tensile stress of the steel acts together with the corrosive medium. That is to say, the grains of the spiral strand ropes slip under the action of tensile stress. When there is a corrosive medium, the material between the grains is destroyed, and then the steel produces cracks along the grain boundaries and expands.

In many post-tensioning and pre-tensioning projects, smooth spiral strand rope is the most widely used pre-stressed steel. The drawing of steel strands is mainly used for improvement projects, but also for nuclear power generation and other projects. spiral strand rope are often used in bridge tie rods, stay cables and external prestressing construction. Epoxy-coated strands are used similarly to galvanized prestressed strands.

 Spiral strands ropes are engineering structural materials required for the construction of roads, railways, bridges, high-rise buildings, and large venues. The high carbon steel wire rod is used for surface treatment and then cold drawn into steel wire. According to the structure of the spiral strands ropes, a certain amount of steel wire is twisted into strands and undergoes a stabilization treatment process to eliminate stress. For increased durability, wires can be plated or coated with metallic or non-metallic coatings such as galvanized, epoxy coated, etc. To improve grip with concrete, the surface can also have cuts etc. After twisting, the pulled out prestressed steel strand undergoes a die compression process, the structure is more compact, and the surface layer is more suitable for the anchor rod to hold.

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