Elastic Inter-Plate Sleeper Fastening System
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing railway sleeper systems face challenges in maintaining vertical mobility and preventing sideways sliding under increased mechanical stress from high-speed vehicle axles, while existing solutions often require additional pretension or complex assembly processes.
Innovation Solution
A fixing device for the sleeper body that uses an anchor bolt and guiding rod system, allowing for immobilization without additional pretension, with an elastic inter-plate providing vertical sliding movement and elastic retention, reducing the number of pieces required and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional through bolts are used to fasten sleepers to the concrete base plate, then the sleeper is securely retained, but the inter-plate is subjected to excessive pretension and the system becomes complex
Solution Approach 1:
The fastening system is divided into separate functional components: the sleeper body with through holes, the elastic inter-plate layer, and the base plate with blind holes. This segmentation allows each component to perform its specific function independently, simplifying the overall system while maintaining reliability.
Solution Approach 2:
Instead of using traditional through bolts that pass completely through the base plate and require nuts on both sides, the invention inverts the approach by using anchor bolts embedded in blind holes within the base plate. The fixing device is retained by these embedded anchor bolts, eliminating the need for external nuts and complex assembly procedures.
2Stability of the object's composition
If an excessively flexible inter-plate is placed under the sleeper, then vertical mobility is improved, but the sleeper may slide sideways on the concrete base plate
Solution Approach 1:
The elastic inter-plate provides localized vertical compliance where needed (under the sleeper body) while the fixing device with anchor bolts provides localized horizontal restraint at specific points. This local differentiation allows the system to have both vertical mobility and sideways stability simultaneously.
Solution Approach 2:
The system combines the elastic properties of the inter-plate material with the rigid mechanical retention of the fixing device. This composite approach allows the inter-plate to deform vertically under load while the fixing device prevents horizontal displacement, achieving both required functions.
3Reliability
If additional pretension is applied to the inter-plate during assembly, then the sleeper is more securely fastened, but the assembly process becomes more difficult and the inter-plate may be damaged
Solution Approach 1:
The elastic inter-plate automatically provides the necessary pretension through its elastic recovery when compressed during assembly. The fixing device is simply inserted through the through hole and retained by the anchor bolt, with the inter-plate's elasticity self-generating the required clamping force without requiring additional pretensioning operations.
Solution Approach 2:
The invention changes the physical state of the inter-plate from a rigid component requiring mechanical pretension to an elastic component that generates pretension through material deformation. This parameter change in the inter-plate's mechanical properties eliminates the need for complex pretensioning procedures while ensuring secure fastening.
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 durable, economic, and elastic fastening system that maintains sleeper body retention while allowing for vertical movement, reducing the risk of sideways sliding and increasing the lifespan of the concrete slab track infrastructure.
Implementation Method 1
an elastic inter-plate providing vertical sliding movement and elastic retention
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a system for securing sleepers in a ballastless track formed by a base plate, sleepers and an interposed elastic intermediate plate, wherein the sleeper body (13) comprises at least one through-hole (12), and the base plate comprises the corresponding blind holes (16) in which a securing pin (17) is embedded, to which a guide rod (22) that can be inserted in the through-hole (12) is joined, via which the sleeper is secured to the base plate in such away that no additional pretensioning is added to that caused by the positioning of the sleeper thereon, and only a certain amount of vertical movement is permitted, forming a disassemblable assembly of the securing elements and the sleepers.