Wide Swath Offset Concrete Screed for Outside-Form Leveling
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Solution Overview
Problem
Conventional mechanized concrete screeds require multiple workers to operate and often damage rebar or end forms, necessitating manual intervention and labor-intensive subgrade preparation, while vibrating screeds are prone to breakdowns due to dirt and dust.
Innovation Solution
A wide swath offset concrete screed mounted on a motorized vehicle, allowing it to be driven outside the forms, eliminating the need for workers to push the screed and reducing labor requirements, with features like a hinge assembly and screed bar spacers to maintain level surfaces without damaging rebar or forms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional mechanized screeds are used, then concrete leveling can be performed, but multiple workers are required to push and guide the screed
Solution Approach 1:
The screed is designed to be self-propelled using a track system that engages with the concrete forms, eliminating the need for workers to manually push and guide the device. The track mechanism automatically propels the screed forward as it levels the concrete, making the system self-service and significantly reducing labor requirements.
2Productivity
If conventional screeds are driven within the forms, then concrete can be leveled, but rebar and end forms are damaged
Solution Approach 1:
The screed is designed with an asymmetric track engagement system where the tracks engage with the outer surfaces of the forms rather than operating within them. This asymmetric positioning allows the screed to level concrete effectively while the tracks ride on the form surfaces, preventing damage to rebar and end forms that would occur with conventional inward-operating designs.
3Manufacturing precision
If vibrating screeds are used, then surface quality is maintained, but the device breaks down frequently due to dirt and dust
Solution Approach 1:
The vibrating mechanism traditionally mounted on the screed body is extracted and replaced with a passive track-based propulsion system. This extraction removes the vulnerable vibrating components that are prone to breakdown from dirt and dust, while the simplified track system is much more resistant to environmental contaminants, significantly improving reliability without compromising surface levelness.
Data Source
AI summary
Methods and systems for making and using a wide swath offset concrete screed apparatus for screeding wet concrete slurry. The apparatus includes a cross support bar, an attachment mechanism for attaching the cross support bar to a liftable arm of a motorized vehicle, and lateral support bars for attaching a screed bar to the cross support bar. The screed bar is positioned offset from the motorized vehicle used to operate the screed, allowing the motorized vehicle to drive outside the forms.