Round Screed Rail for Wall Pours with Easy Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional screed rails used for wall-captured concrete pours face issues such as difficulty in removal, twisting, buckling, and requiring multiple workers to extract, leading to surface damage and structural weakness, especially when wooden stakes sink into soft ground.
Innovation Solution
A round cross-section screed rail system with metal stakes and a stake base assembly, featuring a concave rail support and threaded connections, allowing easy extraction without surface damage and providing stable support, even in soft ground, while using rebar material to enhance concrete integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional flatiron screed rails are used, then structural support for screed bar is provided, but removal becomes difficult and causes surface damage
Solution Approach 1:
The screed rail system is divided into separate components: the screed rail itself and the support mechanism (wooden stakes with metal brackets). This segmentation allows the rail to be easily removed from the concrete surface while the stakes remain embedded, providing structural support during screeding without causing surface damage upon removal
Solution Approach 2:
Metal brackets serve as intermediaries between the screed rail and wooden stakes. The brackets are driven into the concrete along with the stakes, providing a secure attachment point for the rail while being easily removable. This intermediary component solves the contradiction by enabling both strong structural support during use and easy removal afterward without surface damage
2Stability of the object's composition
If wooden stakes are driven deep into ground for support, then stability is improved, but extraction becomes difficult and stakes remain embedded causing surface issues
Solution Approach 1:
The support system is segmented into permanent elements (wooden stakes driven deep for stability) and removable elements (metal brackets and screed rail). The brackets are only partially embedded and specifically designed to be easily removed with the rail, while the stakes remain in place providing continuous stability without causing surface problems
3Ease of operation
If multiple workers are used to extract screed rail, then removal is achieved, but productivity is reduced and surface damage increases
Solution Approach 1:
The metal brackets act as intermediaries that facilitate single-person operation. Their design with protruding portions that fit into notches on the screed rail allows one worker to easily grasp and remove the entire assembly (rail plus brackets) without needing multiple workers, thereby maintaining productivity while achieving complete removal
Solution Approach 2:
The screed rail system is designed to be self-removable by a single operator. The brackets' protruding portions engage with notches on the rail, creating a self-contained unit that can be lifted and removed as one piece, eliminating the need for additional workers to assist with extraction
4Strength
If conventional screed rail is used, then screeding support is provided, but worker footprints damage the concrete surface
Solution Approach 1:
The entire screed rail assembly (rail plus brackets) is completely extracted from the concrete surface after screeding. The brackets are designed to be removed along with the rail, taking with them any potential sources of surface damage. This complete extraction eliminates the need for subsequent floating repairs that would otherwise be required to fix worker footprints and rail removal damage
Data Source
AI summary
A concrete screeding apparatus for a wall captured concrete pour includes a round screed rail with a top edge that defines the level of the screeded concrete, and a stake base assembly with a rail support for holding the screed rail. A rebar stake is driven into the soil through the stake base assembly, and a rail support sits atop the rebar stake.