One-legged Transmission Tower Torsionally Rigid Coupling
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Solution Overview
Problem
One-legged high voltage transmission-line towers face challenges with torsional stiffness, leading to increased costs and maintenance due to the wide line corridor required to manage torque from broken phase conductors, as existing solutions necessitate wide and heavy guyed structures to counteract torsional forces.
Innovation Solution
A one-legged high voltage transmission-line tower design featuring a torsionally rigid coupling at its lower end, allowing the tower to tilt and transmit torque to the foundation, eliminating the need for guys to counteract torsional forces, and utilizing a tubular construction with strategically placed guys and earth peaks for enhanced torsional stiffness and reduced material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a one-legged tower is used with guy-lines from the ends of the beam gantry, then the tower structure is simplified, but the line corridor width increases
Solution Approach 1:
The invention moves the guy attachment points from the horizontal plane (ends of beam gantry) to the vertical dimension (lower end of tower), allowing torque transmission through vertical coupling rather than horizontal bracing, thus reducing corridor width while maintaining structural simplicity
Solution Approach 2:
The torsionally rigid coupling acts as an intermediary element between the tower leg and foundation, transmitting torque directly to the foundation without requiring horizontal guy-lines, thereby resolving the contradiction between structural simplicity and corridor width
2Strength
If portal supports are used, then torsional stiffness is improved, but the structure becomes heavier and wider
Solution Approach 1:
The invention extracts the torque-resisting function from the horizontal portal structure and concentrates it in the vertical tower leg through torsionally rigid coupling, eliminating the need for heavy horizontal bracing while maintaining torsional stiffness
Solution Approach 2:
The invention changes the structural parameter from horizontal portal configuration to vertical one-legged configuration with torsionally rigid coupling, transforming how torsional forces are resisted and significantly reducing structure weight
3Strength
If portal supports are used, then torsional stiffness is improved, but the line corridor width increases
Solution Approach 1:
The invention resolves this contradiction by moving the torque transmission mechanism from the horizontal dimension (portal width) to the vertical dimension (tower height with torsionally rigid coupling), maintaining torsional stiffness while minimizing corridor width
4Stability of the object's composition
If rigid connections are used in one-legged towers, then structural integrity is improved, but the tower cannot accommodate torque from broken conductors
Solution Approach 1:
The invention applies dynamic principles by allowing the tower leg to tilt and rotate at the torsionally rigid coupling, transforming the static rigid connection into a dynamic system that can accommodate torque from broken conductors while maintaining overall structural integrity
Data Source
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AI summary
The invention relates to a one-legged transmission-line tower, which transmission-line tower includes a guyed tower part as a leg and its foundation, insulators carrying the phase conductors of a 3-phase transmission line, earth-wires and earth-wire peaks carrying them and supported on a beam gantry and the said tower part. The transmission-line tower (10) includes at its lower end (33) a coupling (30) transmitting a moment and permitting the tilting of the tower part (12).