Railway Bridge Junction Structure with Below-Sleeper Control
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Solution Overview
Problem
Existing transition structures in railway bridges face issues with wear, maintenance costs, and load distribution, particularly at joints where significant vertical movements and torsional forces occur, leading to rail deformation and potential breakage, and maintenance is cumbersome due to the need for above-accessible designs.
Innovation Solution
A transition structure featuring displaceably mounted cross-members with joint sleepers and a control device to align sleeper positions, arranged below the joint, providing torsional flexibility and reducing wear by distributing loads evenly and maintaining uniform rail support distances, while allowing for maintenance from below.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a stiff compensating plate is used to support rails at the joint, then the vertical offset at both ends is converted into opposite torsional angles, but the plate tends to tilt when the bridge components settle and causes pumping of the superstructure slab leading to considerable wear
Solution Approach 1:
The patent replaces the stiff, static compensating plate with a dynamic sleeper system that can move vertically and rotate independently on each bridge component. The sleepers are supported by springs and dampers that allow them to adapt to settlements and torsional movements without transferring harmful forces to the superstructure slab, thereby eliminating the pumping effect and reducing wear.
Solution Approach 2:
The patent divides the continuous compensating plate into discrete, independent sleepers that can move separately. Each sleeper is supported by its own spring-damper system, allowing localized adaptation to movements without affecting the entire structure. This segmentation prevents the tilting and pumping problems associated with rigid plates.
2Manufacturing precision
If the control device is designed as a scissors construction to maintain uniform sleeper distances, then the joint sleepers can be aligned properly, but the scissor construction has already broken in practice
Solution Approach 1:
The patent replaces the rigid scissor construction with a dynamic control mechanism using springs and dampers that allow the sleepers to move independently while maintaining proper spacing. The control device consists of adjustable connectors that can accommodate movements without breaking, providing both precision and reliability.
Solution Approach 2:
The patent uses adjustable spring stiffness and damper characteristics to control the spacing and alignment of sleepers. By changing the mechanical parameters of the support elements, the system maintains proper sleeper distances while accommodating movements, avoiding the breakdown issues of rigid scissor constructions.
3Ease of repair
If the transition construction is designed for maintenance from above, then the structure can be accessed for maintenance work, but adjacent tracks are blocked during maintenance
Solution Approach 1:
The patent enables maintenance access from below the rail level by designing the sleeper and support systems to be accessible from the track bed. This vertical dimension change allows maintenance workers to access components without blocking adjacent tracks, as they can work from below rather than requiring overhead access that would block the track.
Solution Approach 2:
The patent designs the transition construction with components that can be maintained from multiple directions (above and below). The sleeper system, springs, and dampers are configured to allow maintenance access from the track bed level, providing multi-directional accessibility that maintains track availability during maintenance operations.
4Ease of manufacture
If the traverses and control device are arranged above the joint sleepers, then the structure is easier to construct, but maintenance work blocks adjacent tracks
Solution Approach 1:
The patent inverts the conventional arrangement by placing the traverses and control device below the joint sleepers instead of above. This inversion allows maintenance work to be performed from below the rail level, eliminating the need to block adjacent tracks while maintaining construction feasibility through proper design of the lower arrangement.
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 reduces wear and maintenance costs, enhances durability by absorbing torsional forces without damaging the structure, and allows for easier maintenance without blocking adjacent tracks, thereby improving the overall performance and longevity of the railway bridge.
Implementation Method 1
The transition construction (1) has at least three traverses (5, 6, 7) and a control device (14), which are arranged below the at least one joint sleeper (8, 9, 10)... One or more springs or a scissors construction or the like can serve as the control device.
Data Source
Figure 1
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AI summary
The present invention relates to a junction structure (1) for supporting at least one rail (2) in the region of a joint (3) of a railway bridge (4) and a railway bridge (4) which is constructed with such a junction structure (1). The latter has at least two displaceably mounted cross beams (5, 6, 7), at least one joint sleeper (8) which is attached to the cross beams (5, 6, 7) and has the purpose of supporting the at least one rail (2) in the region of the joint (3), and at least one control device (14) for orienting the position of the joint sleeper (8) in the junction structure (1), wherein the at least one joint sleeper (8) has a rail attachment (13) with which the joint sleeper (8) can be displaceably attached to the rail (2). According to the invention, the cross beams (5, 6, 7) and the control device (14) are arranged underneath the at least one joint sleeper (8).