Adjustable Concrete Paver for Light Rail Trackbeds
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Solution Overview
Problem
Conventional concrete finishing machines are not adept at forming and finishing concrete rail trackbeds with alternating plinth strips and channels, which are essential for light rail construction.
Innovation Solution
A versatile and adjustable concrete finishing machine with a horizontally extending frame supported by adjustable jack stands and hydraulically powered bogies, equipped with slidable carriages and paving heads that form and smooth channels between plinth strips, allowing for precise adjustments and efficient construction of rail trackbeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional concrete finishing machines are used, then general concrete surfaces can be finished, but they cannot form and finish concrete rail trackbeds with alternating plinth strips and channels
Solution Approach 1:
The machine is divided into multiple independent paving heads (first paving head, second paving head, third paving head) that can be positioned at different locations. Each paving head can independently form different features (plinths or channels), allowing the machine to create the alternating pattern of plinth strips and channels required for rail trackbeds
Solution Approach 2:
The machine is designed with multiple paving heads that can perform multiple functions - forming both plinth strips and channels. The first and second paving heads can form plinths while the third paving head forms channels, enabling a single machine to complete the entire trackbed structure rather than requiring separate machines for different tasks
2Adaptability or versatility
If the machine structure is made rigid and fixed, then structural stability is improved, but the machine cannot accommodate varying deck configurations and sizes
Solution Approach 1:
The machine employs adjustable jack stands with hydraulic or mechanical adjustment mechanisms that allow the paving heads to be positioned at different heights and locations. This dynamic adjustability enables the machine to adapt to various deck configurations and sizes while maintaining structural stability through the rigid frame that supports the adjustable components
3Manufacturing precision
If the machine is designed for precise positioning, then manufacturing precision of plinth strips and channels is improved, but the device complexity increases
Solution Approach 1:
The machine replaces complex mechanical positioning systems with hydraulic or pneumatic actuation systems. The jack stands use hydraulic cylinders to precisely position the paving heads at required heights and locations, providing accurate control through fluid pressure regulation rather than complex mechanical linkages
4Productivity
If conventional finishing machines are used, then simple operations are possible, but direction changes require rotating the entire machine which reduces efficiency
Solution Approach 1:
The machine is segmented into an independent control carriage that can be positioned at different locations along the frame. This allows the control system to be relocated without moving the entire machine, enabling quick direction changes and improved maneuverability while maintaining operational simplicity
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
Enables efficient and precise construction of light rail trackbeds with elongated channels and plinth strips, accommodating varying deck configurations and sizes, and allows for quick direction changes without rotating the machine, enhancing construction efficiency and adaptability.
Implementation Method 1
hydraulically powered bogies
Implementation Method 2
vertically upright, adjustable jack stands
Data Source
AI summary
A concrete finishing and forming machine adapted for rail trackbed deck construction accommodates various plinths and channels needed for light rail construction. The adjustably configurable machine comprises a rigid frame disposed above a deck by vertically upright, adjustable jack stands supported at their bottoms by wheeled, powered bogies adapted to traverse upon suitable rails on opposite sides of the deck. The jack-stands may be connected to supporting swing arms that extend from pivot sleeves enabling the jack stands to angularly swing out from the frame. A slidable carriage that is longitudinally displaceable within the frame supports at least one downwardly extending, vertically adjustable paving head having a tool that, when immersed within wet concrete and then horizontally displaced, strikes off elongated, smoothed channels resembling pathways upon the concrete. The heads are longitudinally displaceable relative to the carriage so they may be spaced apart such that plinth strips are concurrently formed between the channels.