Formwork Tie Nut Anti-Rotation for One-Sided Wall Forming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing formwork ties lack an effective anti-rotation mechanism to securely hold formwork elements at a predefined distance, especially when only one side of the concrete wall formwork is accessible, leading to potential inadvertent adjustments during concrete pouring.
Innovation Solution
A formwork tie with a tie rod and tie nut featuring an anti-rotation element that uses a non-circular cross-section and a releasable form fit coupling, allowing the tie nut to be non-rotatably secured to the tie rod through axial movement, enabling secure positioning and adjustment in both two-sided and one-sided installations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional tie nut with a round cross-section is used on the tie rod, then the tie nut can be easily rotated to adjust the distance between formwork elements, but the tie nut may inadvertently rotate during concrete pouring, leading to loss of predefined positioning
Solution Approach 1:
The tie nut is designed with a non-circular cross-section (e.g., square or rectangular) that corresponds to a non-circular opening in the formwork element. This asymmetric geometry prevents rotational movement while maintaining the ability to axially adjust the tie nut position during installation, thereby resolving the contradiction between ease of adjustment and stability of predefined distance.
2Reliability
If the tie nut has a non-circular cross-section to prevent rotation, then the reliability of predefined distance is improved, but the ease of manual rotation and adjustment becomes more difficult
Solution Approach 1:
The system transitions from a static non-rotatable connection to a dynamic one where the tie nut can be freely moved axially during installation, then locked in position after the desired distance is achieved. The non-circular geometry provides rotational constraint only after positioning, allowing easy manual adjustment during the installation phase while ensuring stability during the concrete pouring phase.
3Ease of manufacture
If only one side of the formwork is accessible during installation, then the installation process is simplified, but the ability to securely fix the tie nut non-rotatably becomes more challenging
Solution Approach 1:
The anti-rotation mechanism is segmented into two independent components: the non-circular tie nut and the corresponding non-circular opening in the formwork element. This segmentation allows the tie nut to be inserted and positioned from one accessible side, while the non-circular geometry inherently provides anti-rotation functionality without requiring access to both sides of the formwork.
Solution Approach 2:
The non-circular opening in the formwork element acts as an intermediary that receives and constrains the non-circular tie nut. This intermediary structure provides the anti-rotation function passively through its geometry, eliminating the need for additional active anti-rotation mechanisms that would require access to both sides of the formwork.
Data Source
AI summary
A tie nut of a formwork tie for connecting two formwork elements is secured on a tie rod to prevent inadvertent rotation by way of a form fit coupling that can be axially made to engage therewith.