Catenary Tensioning Device Using Vertical Spring Elements
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Solution Overview
Problem
Existing catenary systems for electric railways face challenges in maintaining constant tension and efficient laying due to temperature fluctuations, requiring complex deflection structures and multi-span post-tensioning, which complicates maintenance and fault resolution.
Innovation Solution
A tensioning device is attached to a portal frame with spring elements that allow continuous laying of catenary lines by routing the contact wire and carrying cable under a single horizontal guy beam, eliminating the need for lateral routing and complex deflection structures, using pretensioned and clamped spring elements to maintain tension during laying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional post-tensioning devices are attached to masts located next to the track, then tensioning can be achieved, but the contact wire and catenary have to be led out to the side of the track requiring complicated deflection structures
Solution Approach 1:
The patent moves the tensioning device from a lateral position (next to the track) to a vertical position (above the track on the portal frame). This dimensional change allows the contact wire and carrying cable to be routed vertically downward rather than laterally outward, eliminating the need for complex deflection structures and enabling direct routing under the portal frame.
2Adaptability or versatility
If masts are located next to the track for tensioning, then tensioning devices can be attached, but single-span post-tensioning cannot be built and three-field post-tensioning is required
Solution Approach 1:
The patent divides the portal frame into independent vertical support columns, each capable of supporting its own tensioning device. This segmentation allows each span to be tensioned independently, enabling single-span post-tensioning configurations and providing flexibility in span design without requiring complex multi-span arrangements.
3Ease of repair
If conventional tensioning arrangements are used with masts next to the track, then tensioning is possible, but maintenance and fault resolution are complicated
Solution Approach 1:
By relocating the tensioning device to a vertical position above the track on the portal frame, the patent simplifies maintenance access. Technicians can access the tensioning devices from above or from the track level directly underneath, eliminating the need to work laterally around complex deflection structures and lateral routing arrangements.
4Ease of operation
If spring elements are attached to vertical masts, then tensioning can be applied, but the contact wire and catenary have to be routed laterally across to the carrying cables
Solution Approach 1:
The patent relocates the spring elements from lateral attachment to vertical attachment on the portal frame columns. This allows the contact wire and carrying cable to be routed vertically downward from the spring elements to the catenary, eliminating lateral routing and associated complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables quick and continuous laying of catenary lines without interrupting the process, reducing the complexity of deflection structures and maintaining tension forces, allowing for efficient maintenance and fault resolution.
Implementation Method 1
spring elements (28, 29) for tensioning the suspension cable (8, 11) and contact wire (9, 12)
Data Source
Figure 1
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AI summary
The device has a main and an auxiliary contact lines (4-7) that are arranged in corresponding sections of tracks (1,2). The ends of contact lines in transition region are connected with spring elements (28,29) for stretching the contact lines. The spring elements are secured at vertical column for retightening. Vertical columns (24-27) are set on horizontal bracing beams (22,23) by portal frames (16,17) which are secured on contact wire (9,12) of both sections of track. A deflection roller is provided at which contact wire is turned back upward to spring element.