Multi-Rotational Concrete Screed with Powered Turntable
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Solution Overview
Problem
Existing concrete screeding machines are complex, costly, and labor-intensive, with limited maneuverability and accuracy in achieving a consistently level surface, especially in large pours, due to their mechanical and electrical complexity and weight distribution issues.
Innovation Solution
A concrete screed apparatus with a telescopic boom assembly secured to a rigid frame, featuring a multi-rotational system with a powered turntable and hydraulic assembly for independent rotation of the screed head and drive frame, allowing for simplified leveling and maneuverability through adjustable stabilization legs and a drive assembly with driven wheels or tracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a turret-type screed system with telescoping boom is used, then the screed head can be positioned and maneuvered across the concrete surface, but the system becomes extremely complex and costly due to mechanical and electrical controls required for turret rotation and boom extension
Solution Approach 1:
The screed system is divided into two independently rotatable sections: the upper portion (screed head assembly) and the lower portion (drive frame), which can rotate relative to each other about a central axis. This segmentation eliminates the need for a complex telescoping boom and turret rotation mechanism, significantly reducing mechanical and electrical system complexity while maintaining full maneuverability.
Solution Approach 2:
The system employs dynamic rotation capability where both the upper and lower portions can independently rotate about the central axis, allowing the screed head to be positioned at any angle relative to the drive direction. This dynamic reconfiguration replaces the static telescoping boom structure with a more flexible and simpler rotational mechanism.
2Length of stationary object
If a telescoping boom is extended from a central turret, then the screed head can reach across large concrete areas, but the heavy weight concentrated at the turret causes variation in the level of the screed head
Solution Approach 1:
By dividing the screed system into independently rotatable upper and lower portions, the weight distribution is fundamentally changed. The screed head weight is no longer concentrated at a single turret point but is distributed along the rotatable upper portion, eliminating the gravitational torque that caused level variation in telescoping boom systems.
Solution Approach 2:
The complex telescoping boom mechanical system is replaced with a simpler direct-attachment system where the boom is secured directly to the rigid frame. This substitution eliminates the intermediate turret connection point, removing the source of weight-induced level variation while maintaining full extension capability.
3Ease of manufacture
If manual leveling and smoothing is performed on large poured concrete areas, then no additional equipment is needed, but the process becomes unwieldy and labor intensive with difficulty maintaining consistent finished grade
Solution Approach 1:
The screed apparatus integrates multiple functions into a single device: it provides both the structural support framework and the active screeding mechanism. The independently rotatable portions allow the same apparatus to handle positioning, maneuvering, and leveling functions that would otherwise require separate equipment or manual operations, significantly improving productivity on large pours.
4Strength
If a heavy metal alloy boom is used to withstand continuous use, then the structure is strong and durable, but the weight concentrated at the turret causes variation in screed head level
Solution Approach 1:
The problematic turret connection point is extracted from the system. Instead of attaching the boom to a central turret, the boom is secured directly to the rigid frame at an optimized location. This extraction eliminates the weight concentration issue while preserving the structural strength and durability needed for continuous construction use.
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 enables efficient, accurate, and cost-effective screeding with reduced mechanical complexity, allowing for quick rotation and positioning of the screed apparatus around a concrete pour, maintaining a consistently level surface with minimal labor and operational costs.
Implementation Method 1
hydraulic assembly for independent rotation of the screed head and drive frame
Data Source
AI summary
A multi-rotational concrete screed to produce a level finished surface that includes a frame assembly, a boom assembly secured to the frame assembly at a first end and to a screed head at a second end, and a drive assembly. A powered turntable is positioned between the frame assembly and drive assembly permitting complete rotation of each with respect to the other.