Surface-Seamless Steel Rail Joint for Thermal Expansion
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Solution Overview
Problem
Existing seamless welded rails face challenges with thermal expansion and contraction, leading to rail buckling, breakage, and noise, especially for high-speed trains, and current non-welded designs leave gaps that cause resonance and safety issues.
Innovation Solution
A surface-seamless steel rail design featuring a right and left connecting part with a seamless spring piece, where the spring piece includes a fixed and free portion, with the free portion fitting into an arc-shaped channel, ensuring a seamless fit and accommodating thermal expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If seamless welded rails are used to eliminate gaps and enable high-speed train operation, then train speed and comfort are improved, but thermal expansion and contraction cause rail buckling, breakage, and increased construction complexity
Solution Approach 1:
The rail is divided into modular sections with standardized connecting parts (plug portions and arc-shaped channels) that can be assembled independently. Each rail section can be manufactured and prepared separately, then connected using the spring piece mechanism, reducing overall construction complexity while maintaining seamless operation for high-speed trains.
Solution Approach 2:
The spring piece is designed with elastic properties to dynamically accommodate thermal expansion and contraction. The spring piece can compress or extend within the arc-shaped channel, providing a dynamic solution that adapts to temperature changes without requiring complex fixed restraint systems.
2Reliability
If non-welded rail designs with gaps are used to solve thermal expansion problems, then thermal stress is reduced, but gaps cause resonance, noise, and safety issues for high-speed trains
Solution Approach 1:
The spring piece acts as an intermediary element between the separating rail sections. It fills the gap created by thermal expansion while maintaining continuous contact with the rail surface, preventing resonance and noise that would occur with traditional gaps, yet allowing thermal movement without stress accumulation.
Solution Approach 2:
The spring piece functions as a flexible component that can deform elastically to accommodate thermal expansion and contraction. This flexible element maintains the seamless surface appearance and structural integrity while allowing the rail sections to move relative to each other, eliminating the harmful effects of rigid gaps.
3Strength
If traditional welded rail connections are used to ensure structural integrity, then connection strength is improved, but the connections create gaps that cause noise and resonance
Solution Approach 1:
The spring piece is designed to copy and match the rail surface geometry exactly. By shaping the spring piece to replicate the rail profile, the connection maintains the seamless appearance and surface continuity of the original rail, eliminating gaps that cause noise and resonance while preserving structural strength.
4Reliability
If multiple mitigation approaches are used to control thermal expansion risks, then rail safety is improved, but construction time and labor costs increase significantly
Solution Approach 1:
The spring piece and connecting parts are designed and pre-positioned during rail manufacturing, with the spring piece already installed in the arc-shaped channel. This preliminary action eliminates the need for complex field adjustments and multiple mitigation steps during construction, reducing construction time while maintaining rail safety through the built-in thermal accommodation mechanism.
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 design ensures a smooth and noiseless train operation by preventing gaps due to thermal expansion, reducing construction and maintenance costs, and enabling high-speed rail operation.
Implementation Method 1
a seamless spring piece (201) located on a top side of the steel rail... the end of the free portion (202) of the seamless spring piece (201) is inserted into an arc-shaped channel (105)
Implementation Method 2
Temperature variations between the day and the night and the seasonal temperature differences will cause problems such as rail buckling or rail breakage
Data Source
AI summary
A surface-seamless steel rail is provided in the present invention. Said surface-seamless steel rail includes a right connecting part located on one side of said steel rail, a left connecting part located on the other side of said steel rail, and a seamless spring piece located on the top side of said steel rail. Both said left connecting part and said right connecting part include a plug portion in embedded engagement with each other. Said seamless spring piece includes a fixed portion at one end and a free portion at the other end, said fixed portion is fixedly connected on top side of said plug portion of one of said left connecting part and said right connecting part. The other of said left connecting part and said right connecting part is provided with an arc-shaped channel at its interior body, said free portion of said seamless spring piece is suitably inserted into said arc-shaped channel.