Stringless Paving Train Control via GPS and Laser
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Solution Overview
Problem
Traditional road construction methods rely on string lines for precision, which are prone to human error, physically obstructive, and inefficient in resource allocation, leading to potential inaccuracies and increased costs.
Innovation Solution
Implementing a stringless paving system that utilizes 3-D terrain models, GPS, RTK, and laser leveling to control paving trains, allowing for precise machine positioning and material estimation based on design profiles, eliminating the need for physical string lines and enabling real-time adjustments for optimal resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If string lines are used to control paving train, then machine positioning can be achieved, but measurement precision deteriorates due to sparse stake spacing and human error
Solution Approach 1:
The patent replaces the mechanical string line system with GPS satellite-based positioning and laser leveling systems. GPS provides continuous high-precision location data without physical obstructions, while laser leveling offers automated real-time elevation control, eliminating manual string line adjustments and associated human errors.
Solution Approach 2:
The patent creates a digital 3-D terrain model that copies and represents the physical terrain and design profile. This digital model serves as a virtual reference that machines can follow precisely, replacing the need for physical string lines and stakes while maintaining or improving positioning accuracy.
2Ease of operation
If string lines are used for paving control, then machine guidance is provided, but object-generated harmful factors increase due to physical obstruction and safety hazards
Solution Approach 1:
The patent substitutes physical string lines with electromagnetic-based GPS and laser systems. These systems provide machine guidance through wireless signals and optical beams that do not create physical obstructions, eliminating safety hazards associated with workers handling string lines and stakes.
3Measurement precision
If detailed surface data is collected before paving, then material estimation accuracy improves, but loss of time increases due to extensive surveying requirements
Solution Approach 1:
The patent performs preliminary 3-D terrain modeling and material estimation using GPS-collected surface data before the paving operation begins. This allows contractors to calculate accurate material volumes in advance, optimize resource allocation, and make informed decisions about material procurement and logistics before committing to the paving workflow.
Solution Approach 2:
The GPS system serves multiple functions: it provides real-time positioning for machine control, collects surface elevation data for 3-D terrain modeling, and enables material volume calculations. This multi-functionality eliminates the need for separate surveying operations, reducing time loss while maintaining measurement precision.
Data Source
AI summary
A method for paving a surface includes identifying the location of a first paving machine in a stringless paving train relative to a reference point and sending instructions to the first paving machine according to a road profile. The method further includes identifying the location of a second paving machine in a stringless paving train relative to the reference point and sending instructions to the second paving machine according to the road profile.