Recess Pipe Cable Bending Limiter for Anchorage Stress Relief
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Solution Overview
Problem
Existing cable anchoring systems experience excessive bending stress and damage due to lateral movements, leading to issues like wire rupture, especially when conventional damping devices are placed far from the anchorage, increasing size and cost, and affecting the aesthetic appearance.
Innovation Solution
A cable bending limiting device is positioned axially inside a recess pipe, allowing lateral movement within a predetermined radial gap, creating a second bending location and distributing stress, while being attached to the recess pipe to prevent excessive bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If damping devices are placed far from the anchorage to reduce bending stress, then the bending angle of strands is reduced, but the size and cost of damping devices increase and aesthetic appearance deteriorates
Solution Approach 1:
The invention transitions the damping device from external placement to internal placement within the recess pipe. The cable bending limiting device is positioned axially inside the recess pipe at a distance from the anchorage, allowing lateral movement within a predetermined radial gap while maintaining compact dimensions. This dimensional repositioning resolves the contradiction by enabling effective bending stress reduction without increasing external device size.
Solution Approach 2:
The cable bending limiting device is nested within the recess pipe structure. The device is received inside the recess pipe and positioned at a specific distance from the anchorage, utilizing the existing structural space. This nesting approach allows the damping function to be integrated without adding external volume, thereby reducing damping device size while maintaining reliability.
2Reliability
If damping devices are placed far from the anchorage to reduce bending stress, then the bending angle of strands is reduced, but the cost and aesthetic appearance deteriorate
Solution Approach 1:
The cable bending limiting device is nested within the recess pipe structure, utilizing existing structural space rather than adding external components. This integration reduces material costs and simplifies manufacturing while maintaining the bending stress reduction function. The compact internal placement also preserves aesthetic appearance by avoiding external additions.
Solution Approach 2:
By repositioning the damping function internally within the recess pipe at a controlled distance from the anchorage, the invention achieves effective bending stress reduction without requiring large external structures. This dimensional repositioning reduces manufacturing complexity and cost while maintaining aesthetic qualities.
3Reliability
If the cable bending limiting device is positioned inside the recess pipe with a predetermined radial gap, then lateral movement is allowed within a safe bending angle, but the device complexity increases
Solution Approach 1:
The cable bending limiting device creates a localized bending control zone within the recess pipe. By positioning the device at a specific distance from the anchorage and providing a predetermined radial gap, the invention allows lateral movement within a controlled region while maintaining simplicity. The local quality approach enables reliable stress distribution without requiring complex overall device structure.
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
The solution effectively limits bending stress on cable strands by preventing excessive angles and distributing stress, reducing the need for increased steel cross-sections and maintaining structural integrity.
Implementation Method 1
the strands of the cable are not fully compacted at the location of the cable bending limiting device and may be elastically deflected, thus further reducing the pressure exerted on the individual strands
Data Source
AI summary
A cable bending limiting arrangement is provided for an anchoring unit including an anchorage, a cable including a plurality of wires and/or strands extending in a tensioned manner from the anchorage, a compacting clamp unit adapted for compacting the wires and/or strands to a side-by-side arrangement and located at a predetermined distance from the anchorage, and a recess pipe surrounding the cable in at least a portion of the predetermined distance. The cable bending limiting arrangement includes a cable bending limiting device adapted for being located axially inside the recess pipe and radially between an outer surface of the cable and an inner surface of the recess pipe leaving an annular gap of a predetermined radial width if the longitudinal axis of the cable extends substantially parallel to the longitudinal axis of the anchorage.