Lightweight Wheeled Screeding Device for Post-Tensioned Concrete
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Solution Overview
Problem
Current concrete screeding technologies are labor-intensive and inefficient when dealing with post-tensioned concrete slabs, as they require manual methods due to the risk of disturbing the post-tensioned cables, which are essential for increased load-carrying capacity.
Innovation Solution
A lightweight, laser-controlled, wheel-driven screeding machine with a vibrating member and adjustable grade setting device that can navigate over post-tensioned cables without disturbing them, allowing for efficient screeding and concrete surface leveling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual screeding devices are used, then the post-tensioned cables are protected from disturbance, but labor intensity and time consumption increase significantly
Solution Approach 1:
The patent changes the weight parameter of the screeding device from heavy (conventional) to lightweight (less than 450 lbs), enabling automated operation while protecting cables. This parameter change allows the device to be both productive and safe for post-tensioned cable applications
Solution Approach 2:
The patent replaces manual mechanical screeding with an automated wheel-driven system featuring laser-controlled grade setting and vibration. This substitution maintains cable protection while dramatically improving productivity through automation
2Productivity
If conventional wheeled screeding equipment is used, then productivity increases, but the equipment weight causes it to sink into uncured concrete and disturb post-tensioned cables
Solution Approach 1:
The patent explicitly changes the weight parameter to less than 450 lbs, preventing the device from sinking into uncured concrete while maintaining enough weight for effective screeding operation. This optimized weight range resolves the contradiction between productivity and cable protection
3Reliability
If manual screeding methods are used, then cable disturbance is avoided, but labor intensity and time consumption increase
Solution Approach 1:
The patent substitutes manual screeding operations with an automated lightweight wheeled system controlled by laser grade references. This automation maintains cable position accuracy while reducing screeding time and labor requirements
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 solution significantly reduces labor and time required for screeding, improves accuracy and levelness, and allows for the use of post-tensioned cables to enhance concrete strength, making it suitable for both residential and commercial applications.
Implementation Method 1
a pair of spaced apart wheels (134) rotatably mounted to the frame portion
Implementation Method 2
the vibratory member (118) screeds and smooths the struck-off concrete surface
Data Source
AI summary
A method and apparatus for screeding post tensioned concrete slabs includes providing a screeding device having a wheeled support having a frame portion and spaced apart wheels rotatably mounted to the frame portion. The screeding device has a screed head mounted to the wheeled support. The screed head includes a vibrating member and a grade setting device adjustably mounted to the vibrating member. The vibrating member is at least partially supportable on the uncured concrete surface, and the grade setting device is adjustable relative to the vibrating member to strike off excess uncured concrete in front of the vibrating member to establish the desired grade or level of the uncured concrete. The screed head may be pivotable relative to the wheeled support about a longitudinal pivot axis extending along the screeding device and in the direction of travel of the screeding device.