Oscillating Screed Bar for Concrete Leveling
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Solution Overview
Problem
Conventional concrete screed devices are laborious and often result in uneven or weak surface finishes, especially when dealing with wet concrete, and they can damage finished surfaces due to their weight and vibration issues, particularly on sloped or decorative slabs.
Innovation Solution
A battery-powered concrete screed device with an oscillating screed bar that is lightweight and capable of instant stopping and restarting, featuring a base bar that glides over wet concrete peaks and troughs, equipped with a motor housing, guide members, and wear strips for reduced friction and improved surface leveling, eliminating the need for rakers and minimizing noise and pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional screed devices are used, then they can level concrete, but they result in uneven or weak surface finishes
Solution Approach 1:
The screed bar is equipped with an oscillating mechanism that vibrates at high frequency to compact and level the concrete surface. This mechanical vibration ensures uniform surface finish while maintaining structural integrity by properly compacting the concrete without creating weak spots.
Solution Approach 2:
The system allows adjustment of oscillation frequency and amplitude parameters to optimize surface finishing quality. By changing these parameters, the device can adapt to different concrete types and slab requirements, ensuring both even finish and adequate surface strength.
2Productivity
If heavy screed devices are used, then they can effectively level concrete, but they damage finished surfaces due to weight and vibration
Solution Approach 1:
The device incorporates a lightweight design using aluminum or composite materials for the screed bar and base structure, counteracting the need for heavy weight while maintaining effective leveling capability. This reduces the harmful impact on finished surfaces while preserving productivity.
Solution Approach 2:
The screed bar is constructed from composite materials that provide high strength-to-weight ratio, enabling effective concrete leveling without excessive weight that could damage the surface. The composite construction also dampens vibrations to prevent surface damage.
3Ease of operation
If traditional screed methods are used, then they can finish wet concrete, but they require rakers and are laborious
Solution Approach 1:
The device combines the functions of traditional rakers and screeds into a single integrated oscillating screed bar assembly. This merger eliminates the need for separate raking operations, reducing labor requirements while maintaining or improving finishing efficiency through the combined leveling and compacting action.
Solution Approach 2:
The oscillating screed bar automatically performs both raking and leveling functions in one operation, making the system self-sufficient without requiring additional manual raking steps. The device serves multiple functions simultaneously, improving efficiency while simplifying operation.
4Productivity
If conventional screed devices are used, then they can level concrete, but they produce noise and pollution
Solution Approach 1:
The device replaces traditional gas-powered engines with an electric motor system, eliminating exhaust pollution and significantly reducing noise levels. The electric oscillating mechanism provides effective concrete leveling capability while being environmentally friendly and quiet compared to conventional combustion-engine screeds.
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 device provides a flat and strong surface finish by keeping stone aggregate close to the surface, avoiding a thick layer of fines, and is suitable for various slab types, including sloped and decorative concrete, without damaging the surface, while being quiet and environmentally friendly.
Implementation Method 1
a battery powered motor supported along the base bar and operationally connected to one of the guide members to oscillate the screed bar against the base bar
Data Source
AI summary
A concrete screed device, having: a base bar extending between first and second ends and having a bottom member and an upright member; a handle structure connected to the base bar, between the first and second ends, and extending away from the base bar to a grip portion; a screed bar disposed against the upright member of the base bar; guide members connected to the screed bar and extending through the upright member of the base bar; a battery powered motor supported along the base bar and operationally connected to one of the guide members to oscillate the screed bar against the base bar; and a wheel supported under the bottom member of the base bar near the first end of the base bar.