Angular Formwork Fastener for One-Sided Push-Pull Prop Support
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Solution Overview
Problem
Existing formwork systems for cast-in-place concrete structures face challenges in flexible assembly and disassembly, particularly when space constraints prevent simultaneous support of positionable and closing formwork walls with push-pull props, leading to undesirable lateral offsets or expensive and inflexible fixed connections.
Innovation Solution
A fastening element with an angular design featuring a mounting part and two legs, where the second leg's free end serves as an attachment point for a push-pull prop, allowing the positionable formwork wall to be supported without an open space behind it, enabling flexible setup and disassembly by pivotable and latchable connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If both positionable formwork wall and closing formwork wall are supported with push-pull props on opposite sides, then the formwork system is stable and balanced, but space is required behind both walls which is not available in foundation pits
Solution Approach 1:
The fastening element extends the support function from a single-point attachment to a multi-point angular structure, distributing the support function across different spatial dimensions. The first and second legs create a triangular support geometry that provides stability without requiring rear space.
Solution Approach 2:
The fastening element acts as an intermediary between the positionable formwork wall and the push-pull prop, transferring and redistributing the support forces through its angular structure. This mediator enables one-sided support while maintaining formwork stability.
2Ease of operation
If closing formwork wall is offset laterally to allow push-pull prop access, then one-sided support becomes possible, but the lateral offset is frequently undesirable for proper formwork alignment
Solution Approach 1:
The fastening element introduces a vertical dimension to the support arrangement, allowing the push-pull prop to engage from above at an angle rather than requiring lateral offset. This transforms the problem from a two-dimensional lateral arrangement to a three-dimensional angular arrangement.
Solution Approach 2:
The fastening element employs asymmetric geometry with a first leg and second leg at different angles, optimized for one-sided support while maintaining proper alignment. The asymmetric design allows the structure to function effectively in the constrained one-sided configuration.
3Area of stationary object
If positionable formwork wall is set up tightly against obstruction without rear space, then space utilization is improved, but conventional push-pull prop support cannot be provided
Solution Approach 1:
The fastening element is pre-installed on the positionable formwork wall before the push-pull prop is positioned. This preliminary action creates the necessary attachment point and geometry in advance, enabling subsequent one-sided support installation without requiring rear access space.
Solution Approach 2:
The support function is segmented into two separate components: the fastening element attached to the formwork wall and the push-pull prop providing external support. This segmentation allows each component to be installed and positioned independently, facilitating installation in constrained spaces.
4Strength
If fixed connection between positionable and closing formwork walls is used, then structural connection is achieved, but assembly and disassembly become expensive and inflexible
Solution Approach 1:
The fastening element employs a movable cap that can pivot between a closed latched position providing strong connection and an open position allowing easy release. This dynamic mechanism enables the connection to transition between locked and unlocked states, providing both strength and flexibility.
Solution Approach 2:
The cap utilizes spherical or rounded geometry that allows pivoting and rotating motion for latching and unlatching. The curved surfaces enable smooth angular movement and self-centering, facilitating easy assembly and disassembly through simple rotational actions.
Data Source
AI summary
A fastening element which can be mounted on the upper side of a positionable formwork wall of a formwork system. The fastening element has an angular element with a first leg and a second leg. The first leg can take the form of a mounting part which can be fastened in a reversibly releasable manner to the positionable formwork wall. As an alternative to this, the first leg can be arranged directly or indirectly on the mounting part. The free end of the second leg has a connection possibility for a push-pull prop or is connected to a push-pull prop. The angular element is preferably designed to be pivotable with respect to the mounting part. With the positionable formwork wall set up, the positionable formwork wall can form, together with the fastening element and the push-pull prop, an arch into which a closing formwork wall can be inserted.