Mechanical Performance Of Pre-stirred Spiral Self-locking Mechanism In Transmission Lines

During the operation of transmission lines, the mechanical load on the conductors fluctuates continuously with environmental changes. As a connecting fitting, the armour rod in transmission line has a unique spiral structure that can generate an adaptive radial constraint effect when the conductor is under stress.

This adaptive mechanism originates from the geometry of clamp armor rods conductor. Multiple single-strand metal wires are pre-twisted according to a specific pitch, forming an elastic tubular cavity structure. During installation, armor rod preformed is wrapped around the surface of the conductor in a spiral direction, and it establishes contact with the conductor surface in the initial state. When the conductor begins to bear axial tension, the helical wire bundle tends to rotate. This movement causes the normal pressure of each wire on the conductor to increase synchronously, forming a tighter wrapping.

The greater the tension load, the more significant the rotation angle of preformed armour rod, and the corresponding increase in radial gripping force. This positive correlation provides the conductor with dynamically enhanced anchoring performance, enabling it to resist greater mechanical stress under extreme climatic conditions. Compared to traditional bolt-type clamps, the armor rods reduces the risk of stress concentration by extending the contact length and distributing stress over a wider area, while also improving the fatigue resistance of the conductor-fitting interface.