Pre-stressed Concrete Track Slab Design for Railway Stability
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Solution Overview
Problem
Ballast tracks in high-speed railways face issues with maintenance due to loose ballast beds, increased maintenance costs, and reduced track regularity and stability, which are exacerbated by the need for frequent replacement and high construction costs of post-tensioned track slabs.
Innovation Solution
A pre-stressed concrete track slab with embedded casings and pre-tensioned steel bars arranged in both longitudinal and transverse directions, combined with insulation and grounding terminals, to reduce vibration, enhance structural integrity, and simplify manufacturing, while allowing for easy adherence of elastic pads and adjustment of drainage systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If post-tensioned track slabs are used, then track stability and regularity are improved, but manufacturing cost and structural weight increase
Solution Approach 1:
The patent inverts the conventional post-tensioning approach by using pre-tensioning steel bars embedded in the concrete slab before curing. This reversal of the tensioning sequence simplifies the manufacturing process, reduces structural weight, and lowers costs while maintaining track stability and regularity.
Solution Approach 2:
The patent applies preliminary action by pre-tensioning the steel bars before the concrete is poured and cured. This preliminary stressing action eliminates the need for complex post-tensioning equipment and procedures, reducing manufacturing complexity and cost while achieving the required track stability.
2Reliability
If post-tensioned track slabs are used, then track stability is improved, but structural weight and complexity increase
Solution Approach 1:
By inverting the tensioning sequence to pre-tensioning, the patent eliminates the need for heavy post-tensioning anchoring systems and equipment, thereby reducing the overall structural weight while maintaining track stability through the pre-applied stresses in the steel bars.
3Ease of manufacture
If ballast tracks are used, then construction is simpler, but maintenance workload and time increase
Solution Approach 1:
The patent segments the track structure into a concrete slab with embedded pre-tensioned steel bars, creating a self-contained unit that eliminates the need for ballast. This segmentation provides the stability of ballast-less tracks with the construction simplicity of conventional methods, while the integrated design reduces maintenance workload and time.
4Ease of manufacture
If pre-tensioned steel bars are used, then manufacturing cost is reduced, but insulation and grounding requirements add complexity
Solution Approach 1:
The patent merges the insulation and grounding functions into the pre-tensioned steel bar system itself. The steel bars are positioned to serve both structural and electrical functions, with grounding terminals and insulation measures integrated directly into the bar arrangement, thereby reducing overall system complexity despite the added requirements.
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 provides a lightweight, low-cost track slab with improved deformation resistance, reduced maintenance needs, enhanced safety, and compatibility with railway signal systems, facilitating easier installation and reduced material usage, thus addressing the challenges of ballast-less track systems in high-speed railways.
Implementation Method 1
At least one row of longitudinal pre-stressed steel bars and at least one row of transverse pre-stressed steel bars are fastened in the slab body along the length direction and the width direction through anchor backing plates and fastener devices. In the pre-stress directions of the longitudinal pre-stressed steel bars and the transverse pre-stressed steel bars, it is post-tensioned in both directions, or it is pre-tensioned in one direction and post-tensioned in the other direction.
Implementation Method 2
The disclosure has the following characteristics: 1. The pre-stressed concrete track slab of slab-type ballast-less track and the pre-tensioning pre-stressed concrete track slab of slab-type ballast-less track of the disclosure are convenient to adhere elastic pads to bottom of the slab so as to achieve vibration reduction for bottom foundations
Data Source
AI summary
Provided in the disclosure is a pre-stressed concrete track slab of slab-type ballast-less track, which includes a slab body (1), on which fastening embedded casings (4) are arranged. At least one row of longitudinal common steel bars (11) and at least one row of transverse common steel bars (12) are arranged in the slab body (1) along a length direction and a width direction. The longitudinal common steel bars (11) are insulated from the transverse common steel bars (12). At least one row of longitudinal pre-stressed steel bars (7) and at least one row of transverse pre-stressed steel bars (6) are fastened in the slab body (1) along the length direction and the width direction through anchor backing plates and fastener devices (8). In the pre-stress directions of the longitudinal pre-stressed steel bars (7) and the transverse pre-stressed steel bars (6), it is post-tensioned in both directions or it is pre-tensioned in one direction and post-tensioned in the other direction. Limiting structures (5) and grounding terminals (10) are also arranged on the slab body (1). The pre-stressed concrete track slab has the characteristics of light structural dead weight, small structure height, low manufacturing cost and deformation resistance.