The Stress Distribution Advantages Brought By The Helical Structure Of The Pre-twisted Wire

armor rods transmission line consists of several metal wires arranged in a predetermined helical direction, forming a hollow strand that interlocks with the object being covered, creating a continuous contact interface under load. This pre-formed helical shape itself achieves a distributed load between the wires, rather than a simple point load, meaning that force is transmitted more evenly along the entire length of the strand.

Local stress fields in materials or structures under external loads tend to concentrate at certain points. Such concentrated stress fields can easily become the initiation point of fracture or fatigue cracks in traditional linear carriers. The spiral-wound armour rod differs from this model. Its multiple metal wires overlap each other along the spiral path, which allows the load-bearing path of a single steel wire to be adjusted alternately. The load is transferred step by step between the multiple metal wires, forming a distributed tension response.

In actual manufacturing and assembly practice, the production of armour rod in transmission line typically follows a strict stranding design to ensure a tight fit between each helical winding. During on-site assembly, this strand is wrapped around the supported cable or conductor by a spiral motion, establishing a continuous contact interface between the carrier and armor rods conductor. In this way, when an external load is applied to the system, the load is transmitted layer by layer along the spiral structure, without the force being cut off or causing severe deformation due to point loads. This structural design is the key design basis for the use of the armor rod preformed in transmission line protection and connection configuration.