Formwork Edge Recesses for Vertical Wall Connection Reinforcement
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Solution Overview
Problem
In concrete construction, rebending connections are limited by maximum bar diameter, restricting fire safety and causing difficulties in multi-story structures due to cumbersome formwork movement around connection reinforcement elements, leading to increased costs and time inefficiencies.
Innovation Solution
A formwork apparatus with edge recesses for holding connection reinforcement elements and reversible forming board elements that seal and facilitate easy removal, allowing vertical sliding and orthogonal movement, reducing the need for extensive repositioning and enhancing load stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rebending connections with maximum bar diameter of 12mm are used, then fire safety requirements cannot be met, but using larger diameter bars increases structural complexity and installation difficulty
Solution Approach 1:
The connection reinforcement element is divided into multiple segments: a first reinforcement bar portion embedded in the wall section and a second reinforcement bar portion extending outward. This segmentation allows using smaller diameter bars (meeting fire safety) while achieving the required structural connection through the distributed reinforcement configuration.
Solution Approach 2:
The connection reinforcement transitions from a single-dimensional bar to a three-dimensional L-shaped or U-shaped configuration. By extending the reinforcement in multiple directions (embedding portion + projecting portion), the solution achieves both fire safety compliance (through smaller diameter) and structural connectivity (through spatial distribution).
2Reliability
If connection reinforcement elements are embedded in wall sections, then fire safety requirements are met, but formwork elements must be moved cumbersome manner around the reinforcement elements, increasing time and cost
Solution Approach 1:
The formwork element incorporates movable forming board elements that can be dynamically adjusted during the concreting process. These forming boards can be positioned to accommodate the protruding connection reinforcement elements, allowing the formwork to adapt rather than requiring manual repositioning around fixed obstacles.
Solution Approach 2:
The forming board elements act as intermediaries between the formwork structure and the connection reinforcement elements. They provide a bridging mechanism that allows concrete to be properly formed around the protruding reinforcement while maintaining formwork integrity, eliminating the need to manually move formwork around the reinforcement.
3Reliability
If forming board elements are used to cover edge recesses, then fresh concrete escaping is prevented, but the complexity of formwork assembly increases
Solution Approach 1:
The forming board elements are integrated with the edge recesses of the formwork element to form a unified sealing system. The forming boards fit into the recesses and work together with the formwork structure to contain concrete, combining multiple functions (sealing, support, and reinforcement accommodation) into a single integrated component system.
Data Source
AI summary
A formwork apparatus for producing a wall section in fresh concrete design that includes projecting connection reinforcement elements for connecting a floor to be constructed, comprising a formwork element that includes a support structure and a forming panel supported on the support structure. The formwork element is provided on one of its edge sections with a plurality of edge recesses spaced preferably uniformly apart from one another for the connection reinforcement elements. A single forming board element or multiple forming board elements serve to reversibly cover the edge recesses when the connection reinforcement elements extend through the edge recesses. A method for producing wall sections situated vertically above one another with projecting connection reinforcement elements in fresh concrete design for connecting to a floor.