Prefabricated Slab Track Bed for Rail Vehicles
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Solution Overview
Problem
The installation of elastically mounted slab tracks for rail vehicles using in-situ concrete construction is complex and costly due to the need for intricate formwork and subsequent assembly of elastic elements, which is time-consuming and inefficient.
Innovation Solution
The use of prefabricated slabs that serve as both the bottom layer of the mass-spring system and formwork, with elastic elements positioned underneath, eliminating the need for separate formwork and allowing for a monolithic bond with the concrete support slab, along with additional reinforcement for effective force transmission and vibration damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If in-situ concrete construction with pre-placed elastic elements is used, then vibration decoupling is achieved, but installation complexity and cost increase due to complex formwork requirements
Solution Approach 1:
The patent combines the formwork function and the bottom layer function into a single integrated component. The prefabricated slab serves simultaneously as the bottom layer of the mass-spring system and as the formwork for concreting the concrete support slab, eliminating the need for separate formwork structures and subsequent assembly operations.
Solution Approach 2:
The elastic elements are pre-positioned on the prefabricated bottom layer before the concrete support slab is cast. This preliminary placement ensures that the elastic elements are correctly positioned without requiring subsequent lifting and positioning operations, simplifying the construction process while maintaining vibration decoupling functionality.
2Adaptability or versatility
If elastic elements are positioned after concrete support slab assembly, then placement flexibility is maintained, but installation time and cost increase due to hydraulic lifting requirements
Solution Approach 1:
The elastic elements are pre-positioned on the prefabricated bottom layer before the concrete support slab is cast. This preliminary placement eliminates the need for subsequent lifting and positioning operations, significantly reducing installation time while maintaining correct element positioning through the integrated formwork design.
Solution Approach 2:
The bottom layer and formwork are merged into a single prefabricated slab unit, which allows elastic elements to be pre-positioned during manufacturing. This integration eliminates the time-consuming sequential operations of assembling formwork, casting concrete, and then positioning elastic elements.
3Adaptability or versatility
If separate formwork and subsequent elastic element assembly are used, then construction flexibility is maintained, but productivity decreases due to multiple process steps
Solution Approach 1:
The patent merges the bottom layer and formwork into a single prefabricated slab unit, reducing multiple construction steps into a single integrated component. This merger maintains construction flexibility through modular design while significantly improving productivity by eliminating sequential assembly operations.
Solution Approach 2:
The track system is segmented into prefabricated slabs that can be manufactured off-site and assembled on-site. This segmentation allows for standardized production of integrated bottom-layer-formwork units with pre-positioned elastic elements, improving both productivity and construction flexibility.
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
This approach simplifies and cost-reduces the installation process while achieving effective vibration decoupling and suppression of specific frequency range vibrations, enhancing the efficiency and cost-effectiveness of the slab track system.
Implementation Method 1
The elastic element, which is arranged between the roadway capable of vibrating and the subsoil, for example a tunnel structure, causes a decoupling of the vibrations, so that the size of the vibrations transmitted to the subsoil does not exceed a certain level.
Implementation Method 2
The track is designed as a separate, oscillating mass, which is movably mounted on an elastic element acting as a spring relative to the ground.
Implementation Method 3
The monolithic connection can be achieved by gluing and/or profiling the surfaces of the prefabricated panel (6) and/or mechanical connections.
Implementation Method 4
The monolithic connection can be achieved by gluing and/or profiling the surfaces of the prefabricated panel (6) and/or mechanical connections.
Implementation Method 5
In order to achieve good force transmission in the area of adjacent prefabricated slabs, additional reinforcement can be arranged at the joints. This reinforcement can be designed as a reinforcement mat, the reinforcement rods of which are arranged in the longitudinal direction and each cover the joints.
Implementation Method 6
Through the targeted selection of the mass of the concrete base plate and the properties of the elastic elements, vibrations in a specific frequency range can be specifically suppressed.
Implementation Method 7
Through the targeted selection of the mass of the concrete base plate and the properties of the elastic elements, vibrations in a specific frequency range can be specifically suppressed.
Data Source
Figure 1
Figure 2
AI summary
Fixed track bed for rail vehicles which is mounted on elastic elements, with the concrete support plate (3) being composed of prefabricated plate elements (6) and a layer of local concrete located thereon, with the prefabricated plate elements resting on the elastic elements and forming a monolithic composite with the local concrete.