Extendable Protective Wall for Rail Platforms
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Solution Overview
Problem
Existing solutions for protecting people from moving rail vehicles, such as automatic platform screen doors, are not suitable for scenarios where train stopping precision is lacking or variable, and they fail to protect against passing express or freight trains, as they can be deformed by pressure waves and vibrations.
Innovation Solution
A protective device comprising an extendable wall system with an inner and outer protective wall, where the inner wall is positioned further from the platform edge than the outer wall, forming a redundant system to prevent deformation and damage from pressure waves, and equipped with a drive mechanism for independent control and a cavity for space-efficient integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic platform screen doors are installed, then passenger protection from moving rail vehicles is improved, but the system requires precise train stopping accuracy and uniform door distances which limits adaptability
Solution Approach 1:
The protective wall is designed to be movable between a retracted position (allowing train access to platform) and an extended protective position (blocking access to track). This dynamic positioning allows the same structure to adapt to different operational modes: passenger boarding/discharging requires the wall retracted, while train passage requires the wall extended, eliminating the need for precise stopping accuracy
Solution Approach 2:
The protective wall is divided into multiple segments or panels that can move independently or in coordination. This segmentation allows the wall to adapt to different train lengths and door configurations, providing flexible protection that works with various train types and door distances without requiring precise positioning
2Area of stationary object
If retractable protective walls are positioned close to the platform edge, then space efficiency is improved, but the walls are deformed by pressure waves from passing rail vehicles
Solution Approach 1:
The protective wall panels are designed to nest within each other or within a housing structure when retracted, minimizing the space required at the platform edge. When extended, they form a continuous protective barrier. This nesting arrangement allows the wall to maintain structural strength while occupying minimal space in its retracted state
Solution Approach 2:
The protective wall is constructed from composite materials that combine high strength-to-weight ratio with resistance to pressure waves and vibrations. These composite structures maintain structural integrity when positioned close to the platform edge, resisting deformation from passing trains while remaining space-efficient
3Device complexity
If a single protective wall is used, then device complexity is reduced, but reliability decreases when one wall fails due to faulty drive
Solution Approach 1:
The protective wall system is divided into multiple independent wall sections, each with its own drive mechanism. This segmentation allows individual sections to operate independently, so if one section fails, the others remain functional and continue to provide protection. The modular design maintains manageable complexity while significantly improving reliability through redundancy
Solution Approach 2:
The system incorporates redundant drive mechanisms and backup systems that are预先 prepared and integrated into the wall structure. If a primary drive fails, the system can switch to backup drives or alternative actuation methods, ensuring continuous protective function without requiring complete system replacement
4Reliability
If protective walls are extended to block track access, then passenger safety is improved, but access to tracks becomes restricted even when not needed
Solution Approach 1:
The protective wall is designed as a dynamic structure that can be retracted to allow train access to the platform and extended to block track access when trains are passing. This dynamic positioning ensures that safety protection is provided only when necessary, maintaining ease of operation for normal platform activities while ensuring safety during train passage
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
A protective device for protecting persons from travelling rail vehicles in a railway station area comprises an inner and an outer protective wall (11, 12, 76, 77, 88, 89). The railway station area contains at least one platform (4), wherein the platform (4) has at least one platform edge (2, 22), and tracks for a rail vehicle are arranged on a first side of the platform edge (2, 22), and a platform surface (23) extends from the second side of the platform edge (2, 22). The railway surface is embodied as a waiting area for persons. The protective wall (11, 12, 76, 77, 88, 89) is located at or in the vicinity of the platform edge (2, 22) and can be adjusted between a retracted state and an extended state in such a way that in the extended state of the protective wall (11, 12, 76, 77, 88, 89) access to the tracks is prevented, and in the retracted state the access to the tracks is permitted.