Ferromagnetic Ring Marking for Concrete Ceiling Measurement Points
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Solution Overview
Problem
Existing methods for marking measuring points in poured concrete slabs, particularly for air conditioning systems, result in visible interruptions and potential rust stains when nails are shortened or corrode, disrupting the plaster layer and making it difficult to detect the marking points post-application.
Innovation Solution
A detachable, at least partially ferromagnetic ring body is attached to the formwork concentrically with the measuring point, allowing it to remain flush with the concrete ceiling after demolding, enabling detection through magnetic means without disrupting the plaster layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nails are used as marking bodies and driven into the formwork, then the marking points are visible after concrete pouring, but the nails disrupt the plaster layer and cause visible interruptions and rust stains
Solution Approach 1:
The harmful part (nail shaft protruding through plaster) is extracted by using a ring body that sits flush with the concrete surface. The marking function is separated from the protruding element, allowing the plaster to be applied continuously over the marking point without interruption.
Solution Approach 2:
The marking function is achieved using a simple ferromagnetic ring body that can be easily attached to the formwork and removed with it. The ring body serves its purpose temporarily during construction and then becomes part of the concrete surface without causing long-term harm.
2Object-affected harmful factors
If nails are shortened after plaster application to avoid disrupting the plaster layer, then the plaster surface remains continuous, but the marking points formed by the nails are lost
Solution Approach 1:
The mechanical detection method (visually seeing nail heads) is replaced with magnetic detection. The ring body's ferromagnetic property allows it to be detected through the plaster layer using a magnet, eliminating the need for the nail to protrude through the plaster to be visible.
Solution Approach 2:
The detection method changes from visual (seeing the nail head) to magnetic (detecting the ferromagnetic ring body). This is analogous to changing the 'signal' property from optical visibility to magnetic detectability, allowing the marking point to remain hidden in the plaster while still being detectable.
3Stability of the object's composition
If permanent magnets are used to hold marking bodies on the formwork, then the marking bodies remain in place during concrete pouring, but the magnets have no function after demoulding and must be removed
Solution Approach 1:
The marking body (ring body) is merged with the formwork system during pouring by attaching it to the formwork. After demoulding, the ring body remains integrated with the concrete surface while the formwork is removed, eliminating the need for separate removal of the marking body.
Solution Approach 2:
The ring body serves multiple functions: it provides positioning stability during pouring by attaching to the formwork, and after demoulding it remains as a functional marking point on the concrete surface. The same object fulfills both temporary (during pouring) and permanent (after pouring) requirements.
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
Ensures a continuous plaster surface while allowing accurate detection and marking of measuring points, preventing rust stains and maintaining the integrity of the plaster layer, facilitating the precise placement of heat exchanger registers.
Implementation Method 1
an at least partially ferromagnetic ring body (4) is detachably attached to the formwork (1) concentrically to the measuring point as the marking body
Data Source
Figure 1
AI summary
A method for marking a measuring point in a cast concrete ceiling (2) is described, the formwork (1) for the concrete ceiling (2) being provided with a marking body (3) for the measuring point depicted on the formwork (1) before the Concrete cover (2) is poured. In order to be able to advantageously fix the marking bodies (3), it is proposed that an at least partially ferromagnetic annular body (4) be detachably fastened to the formwork (1) concentrically to the measuring point as the marking body.