Ceiling Joist Formwork with Rotating Outer Board and Guided Inner Panel
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Solution Overview
Problem
The existing beam formwork systems cause significant stress and damage to the inner shield during the stripping process, leading to the need for repair or replacement, as the inner shield is typically torn from the concrete beam, making the process cumbersome and labor-intensive.
Innovation Solution
The beam formwork system is designed such that the joist floor and outer plate are mounted to rotate about a first pivot point, with a link attached to the inner plate, allowing simultaneous actuation of the inner shield, outer shield, and joist floor, guiding the inner shield relative to the floor table in a direction perpendicular to its formwork plane, enabling easy stripping by gravity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inner shield is stripped by lowering the floor table in the known beam formwork system, then the stripping process can be completed, but the inner shield is torn from the concrete beam causing significant stress and damage
Solution Approach 1:
The patent applies dynamics by making the floor table and outer shield movable relative to the inner shield through a guide mechanism. The floor table can move horizontally along the guide while the inner shield remains stationary or moves minimally, transforming the stripping process from a forceful tearing action to a controlled sliding action that reduces stress on the inner shield
Solution Approach 2:
The patent segments the formwork system into independently movable components: the inner shield, the floor table, and the outer shield. This segmentation allows the floor table to be moved separately from the inner shield during stripping, enabling the floor table to slide horizontally along the guide while the inner shield stays in place, thereby avoiding the tearing damage that occurs when all components are moved together
2Reliability
If the inner shield is separated from the floor table and formwork separately to avoid damage, then the inner shield is protected from damage, but the stripping process becomes cumbersome and labor-intensive
Solution Approach 1:
The patent merges the guide mechanism for the floor table with the overall formwork structure. The guide is integrated into the formwork system, allowing the floor table to move horizontally along a predefined path while remaining connected to the overall structure. This integration enables automatic or assisted stripping where the floor table slides away from the inner shield along the guide, combining protection of the inner shield with operational simplicity
3Reliability
If the inner shield is guided perpendicular to its formwork plane during stripping, then the inner shield is protected from damage, but the mechanism complexity increases
Solution Approach 1:
The patent introduces a guide mechanism as an intermediary element between the floor table and the inner shield. This guide serves as a mediator that constrains the floor table's movement to a horizontal path along the guide, preventing the floor table from pulling the inner shield off at an angle. The guide is a simple linear constraint that adds minimal complexity while effectively protecting the inner shield from damage
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
This design allows for simple and damage-reduced stripping of the inner panel, as the entire assembly can be actuated together, minimizing bearing forces and using gravity for removal, thus reducing the risk of damage and simplifying the process.
Implementation Method 1
allows simultaneous actuation (moving) of the inner shield, outer shield and joist floor when shuttering and dismantling
Implementation Method 2
the inner panel and the link are jointly pivoted about a second hinge point on the joist floor
Data Source
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AI summary
The invention relates to a ceiling joist formwork system (1) comprising a ceiling table (2), a vertical support (6), an inner board (3), a ceiling joist base (4), and an outer board (5), the outer board (5) and the ceiling joist base (4) being interconnected, especially rigidly interconnected. The vertical support (6) is rigidly fixed to the ceiling table (2), and the ceiling joist base (4) is fixed to the vertical support. The system according to the invention is characterised in that the ceiling joist base (4) and the outer board (5) are rotatably mounted about a first articulated point (GP1) on the vertical support (6), a guide (7) is rigidly fixed to the inner board (3), the inner board (3) and the guide (7) are rotatably mounted about a second articulated point (GP2) on the ceiling joist base (4), and the inner board (3) is guided by means of an edge (14a, 14b) in relation to the ceiling table (2) along a direction comprising at least one component vertical to the formwork upper plane of the inner board (3). The ceiling joist formwork system according to the invention can be used to simplify the dismantling, especially of the inner board, and the risk of damage to the inner board is reduced.