Truss-Mounted Screed Assembly for Concrete Finishing
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Solution Overview
Problem
Conventional concrete finishing machines, such as cylinder-based finishers, require multiple passes and additional equipment like puddlers for initial leveling and finishing, which can be inefficient and labor-intensive, especially when dealing with complex surfaces like bridge decks and streets.
Innovation Solution
A high-production truss-mounted screed assembly that combines an auger, a cylinder, and a vibratory screed, allowing for broader finishing passes and reducing the need for puddlers by incorporating a system where the auger strikes off excess concrete, the cylinder compacts, and the vibratory screed provides a final finish, all while adjusting height and orientation to accommodate various surface geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cylinder-based finishers with multiple passes are used, then finishing quality can be achieved, but productivity and finishing speed are reduced
Solution Approach 1:
The patent combines multiple finishing functions (auger for strike-off, cylinder for compaction, vibratory screed for final finish) into a single integrated assembly that operates in one pass. This merging of functions eliminates the need for multiple separate passes and equipment, thereby maintaining finishing quality while significantly improving productivity and finishing speed.
Solution Approach 2:
The screed assembly is designed as a multi-functional unit where the auger, cylinder, and vibratory screed work together to perform strike-off, compaction, and final finishing operations simultaneously. This universal design allows one assembly to replace multiple specialized devices, achieving both high quality and high speed in a single operation.
2Manufacturing precision
If multiple pieces of equipment (puddlers, cylinder finishers) are used for initial leveling and finishing, then surface quality can be improved, but device complexity and operational difficulty increase
Solution Approach 1:
The patent integrates the functions of puddlers and cylinder finishers into a single screed assembly with an auger, cylinder, and vibratory screed. This consolidation reduces the number of separate equipment pieces from multiple to one, simplifying the overall system while maintaining the ability to achieve high surface quality through coordinated operation of all components.
Solution Approach 2:
The screed assembly serves as a universal device that performs initial leveling, compaction, and final finishing in one operation. This multi-functional design eliminates the need for sequential use of multiple specialized equipment, thereby reducing device complexity and operational difficulty while preserving surface quality outcomes.
3Device complexity
If conventional finishers work in limited passes (6-18 inches per pass), then equipment simplicity is maintained, but productivity and area coverage are restricted
Solution Approach 1:
The patent combines strike-off, compaction, and finishing functions in one assembly, enabling the equipment to handle much broader passes. The integrated design allows the screed assembly to efficiently manage and finish large areas in a single pass without requiring multiple sequential operations, thereby dramatically increasing area coverage while maintaining operational simplicity.
Solution Approach 2:
The multi-functional screed assembly can handle broad passes by performing all necessary finishing operations (leveling, compaction, final finish) simultaneously across a wide working width. This universal capability allows the equipment to maintain simplicity while achieving high productivity and extensive area coverage per pass.
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 solution significantly improves finishing speed and efficiency, allowing for broader passes and reducing the need for additional equipment, thus enhancing the quality and speed of concrete finishing on complex surfaces.
Implementation Method 1
an auger configured for rotation around a first rotational axis, the auger configured to shift an excess portion of the concrete in a paving direction forward of a current transverse pass
Implementation Method 2
a cylinder configured for rotation around a second rotational axis, the second rotational axis offset from the first rotational axis, the cylinder configured to compact the working surface
Implementation Method 3
a vibratory screed mounted behind the cylinder, the vibratory screed having a rear surface offset behind a rear surface of the cylinder relative to the paving direction, the vibratory screed configured to provide a final finish of the working surface
Data Source
AI summary
A screed assembly includes an auger, a cylinder, and a vibratory screed. The screed assembly is included in an undercarriage. The undercarriage is coupled to a carriage. The carriage travels along a length of a framework. One or more sensors are used to determine height information of the screed assembly relative to a surface to be paved. One or more actuators are used to selectively adjust the height of the screed assembly based on the height information.