Railway Tie Duct Outlet Bushing for Cable Routing
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Solution Overview
Problem
Existing concrete railway ties with embedded ducts for electrical cables face issues with cable extraction and insertion due to high friction, leading to damage and difficulty in bending cables for connection to rails, resulting in inefficient cable laying.
Innovation Solution
A concrete railway tie with transverse grooves and metal plates with bushes at duct inlets and outlets, guiding cables with a trapezium-shaped cross-section and minimizing direct friction, allowing easier bending and protection from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical cables are passed through ducts embedded in concrete ties, then cable protection and concealed routing are improved, but high friction at duct outlets causes cable damage and makes bending difficult
Solution Approach 1:
A metal plate with a bush is introduced as an intermediary component between the cable and the duct outlet. The bush provides a smooth transition surface that reduces friction during cable extraction, while the metal plate protects the concrete structure. This intermediary resolves the contradiction by maintaining cable protection while facilitating easier cable handling.
Solution Approach 2:
The outlet of the duct is modified to have a gradually increasing cross-sectional area, creating a conical or tapered shape instead of a sudden opening. This geometric parameter change reduces friction and stress concentration on the cable during extraction, preventing damage while maintaining the protective function of the embedded duct system.
2Shape
If ducts are embedded in concrete ties for concealed cable routing, then aesthetic appearance and structural integration are improved, but cable extraction becomes difficult due to friction and concrete damage
Solution Approach 1:
The metal plate with bush acts as a mediator that maintains the concealed routing aesthetic while providing a friction-reduced extraction path. The plate is integrated into the concrete tie structure, preserving the hidden cable routing appearance, while the bush facilitates easier cable removal and installation.
Solution Approach 2:
The duct outlet is pre-shaped with a tapered geometry and the metal plate with bush is pre-installed before cable laying. This preliminary preparation creates favorable conditions for cable extraction by reducing friction in advance, making the cable laying process more efficient without compromising the concealed routing design.
3Adaptability or versatility
If cables are bent sharply at duct outlets to reach rails, then connection to track circuit is achieved, but high friction damages cables and surrounding concrete
Solution Approach 1:
The duct outlet cross-sectional area is changed to increase gradually, creating a tapered transition zone. This parameter change allows cables to bend more gradually rather than sharply, reducing friction and stress concentration that would otherwise damage the cable and surrounding concrete structure.
Solution Approach 2:
The metal plate with bush serves as an intermediary that provides a smooth transition surface for cable bending. It allows the cable to change direction toward the rail with reduced friction and stress, preventing damage while maintaining the necessary routing flexibility to reach the track circuit connection points.
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
A concrete railway tie (1) comprising two opposite end platforms (10) whereon end portions of rails (R1, R2) are rested ; said railway tie (1) comprising longitudinal ducts (4a) made with pipes (4a) of plastic material and an identical pair of trapezium-shaped transverse grooves (11), with the lower base facing downwards; said ducts (4) being provided with an inlet (40) obtained in one of the ends (13) of the railway tie and an outlet (41) ending in one of the lateral edges (11 b) of the transverse grooves (11); said ducts (4) substantially having a horizontal rectilinear trajectory, except for the end portion provided with an upward trajectory.