Slab Trackway Escape Route Formwork and Sleeper Integration
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Solution Overview
Problem
Existing escape routes for road vehicles in rail tunnels are often impractical due to the need for prefabricated slabs that require adjustment for varying track dimensions and sleeper block spacings, leading to instability and increased storage costs, and they can impede the mobility of elastically mounted sleeper blocks.
Innovation Solution
A method involving the placement of a rubber shoe with an elastic insert on sleeper blocks, using hoods and removable plates to create a stable and adjustable escape route that fits exactly on the roadway slab, allowing for flexible installation and drainage, and eliminating the need for prefabricated panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If prefabricated slabs are used for escape routes, then the escape route can be installed quickly, but the slabs do not rest stably on the infill concrete slab and tilt when driven on, causing severe local wear
Solution Approach 1:
The escape route is divided into multiple individual slabs that are placed separately on the infill concrete slab. Each slab is positioned independently between the sleeper blocks, allowing for stable placement while maintaining quick installation. The segmented approach enables the slabs to be distributed evenly across the roadway surface.
Solution Approach 2:
The dimensions of the escape route slabs are predetermined based on standard track configurations. The slabs are pre-sized to fit between typical sleeper block dimensions and spacings, eliminating the need for on-site adjustment or customization. This preliminary sizing ensures stable placement on the infill concrete slab while maintaining rapid installation.
2Adaptability or versatility
If the dimensions and weight of prefabricated slabs are adjusted to fit track width, sleeper block dimensions, and spacing, then the escape route can accommodate different configurations, but it becomes uneconomical to store prefabricated panels
Solution Approach 1:
A single standardized slab design is used that can accommodate multiple track configurations. The universal slab dimensions are designed to fit standard sleeper block sizes and spacings, allowing the same slab type to be used across different track widths and configurations. This eliminates the need for multiple specialized slab sizes and makes storage economical.
Solution Approach 2:
The slab design incorporates adjustable parameters such as length and positioning that can be modified within a standard range to accommodate different track configurations. By allowing parameter variations within standardized limits, the system maintains adaptability to different sleeper block dimensions and spacings without requiring completely different slab designs for each configuration.
3Stability of the object's composition
If permanent formwork is used to cast the escape route, then the escape route is integrated with the carriageway slab, but the formwork surrounds the sleepers and running rails, impeding the mobility of sleeper blocks
Solution Approach 1:
The formwork is extracted or removed from around the sleeper blocks and running rails. Instead of permanent formwork that encloses the sleepers, the solution uses removable formwork or alternative containment methods that allow the sleeper blocks to move freely during elastic mounting operations. The escape route is still cast integrally with the carriageway slab, but the formwork does not constrain the sleepers.
Solution Approach 2:
The formwork system is made dynamic rather than permanent. The formwork can be installed and removed as needed, allowing sleeper blocks to be freely positioned and adjusted during installation and maintenance. This dynamic approach maintains the integral connection between escape route and carriageway while preserving sleeper block mobility.
4Loss of time
If the escape route is cast before the carriageway slab hardens, then the escape route can be installed early, but it requires walking on the freshly poured carriageway slab to attach formwork
Solution Approach 1:
The formwork is installed on the sleeper blocks before the carriageway slab is poured. This preliminary placement allows the formwork to be positioned accurately without requiring workers to walk on freshly poured concrete. The formwork remains in place during the pouring and hardening process, and the escape route is then cast integrally with the carriageway slab.
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 stable and resilient escape route that adapts to different track configurations without impeding sleeper block mobility, reducing storage needs and ensuring stable installation, while also improving drainage and safety by closing gaps and allowing for easy assembly and disassembly of formwork.
Implementation Method 1
a rubber shoe is placed on the sleeper blocks from below, in which an elastic insert is arranged
Data Source
Figure 1~3
Figure 4~6
Figure 7~9
AI summary
In order to produce a slab trackway for rail vehicles with an escape route (12) for road vehicles, a prefabricated track section with rails (8) and sleepers (5) is supported and positioned on a substructure (1) by means of a supporting and directing device. Thereafter, a trackway slab (10) is produced by casting between the sleepers (5). The part of the sleepers (5) which projects out of the trackway slab (10) and the rails (8) is limited by formwork, and an escape route (12) is constructed on the trackway slab (10) by casting.