Composite Rabbet Element for Airtight Window Sealing
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Solution Overview
Problem
Traditional rabbet elements for windows and doors face challenges in providing adequate insulation, mechanical stability, and airtightness while also absorbing static and dynamic impacts, leading to heat losses and condensation due to poor connections with concrete panels and insufficient fire resistance.
Innovation Solution
A composite rabbet element with screwable plates coated in fire-stable materials and a glass fibre net-reinforced mineral render, embedded in concrete walls using screw anchors or wood screws, ensuring mechanical stability, airtightness, and fire-proofing, with a λ-value comparable to mineral wool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cement-based chipboard is used to form the rabbet element, then the mechanical connection to concrete panels is improved, but the airtightness deteriorates due to poor connection and cracking
Solution Approach 1:
The patent employs a composite structure consisting of an insulation layer (mineral wool or similar) sandwiched between two plates (inner plate and outer plate). This composite construction combines the mechanical strength of the plates with the insulating and sealing properties of the insulation material, creating a system that simultaneously achieves strong mechanical connection and reliable airtightness. The insulation layer acts as a continuous sealing barrier that prevents air leakage while the plates provide structural integrity.
2Loss of energy
If insulation thickness is increased to reduce line loss, then the thermal insulation performance is improved, but the mechanical stability deteriorates due to deeper rabbets
Solution Approach 1:
The composite structure with rigid plates on both sides of the insulation layer provides mechanical reinforcement that allows for increased insulation thickness without compromising structural stability. The inner plate transfers loads to the concrete panel, while the outer plate provides a stable mounting surface for windows and doors, enabling the use of thicker insulation materials to reduce thermal bridging and line losses.
Solution Approach 2:
The rabbet element is segmented into distinct functional layers: the inner plate for structural connection, the insulation layer for thermal performance, and the outer plate for mechanical support and sealing. This segmentation allows each component to be optimized independently - the insulation thickness can be increased for better thermal performance while the plates maintain mechanical stability.
3Ease of manufacture
If chipboard is used for the rabbet element, then the ease of manufacture is improved, but the fire resistance deteriorates
Solution Approach 1:
The patent replaces combustible chipboard with a composite construction using non-combustible materials: mineral wool insulation and metal or fire-resistant plates. This composite structure maintains ease of manufacture through standardized components while providing superior fire resistance, as the insulation layer and plates are both fire-resistant materials that do not contribute to fire spread.
4Quantity of substance
If the rabbet element uses traditional construction methods, then the cost is reduced, but the airtightness and insulation performance deteriorate due to line losses
Solution Approach 1:
The composite rabbet element with continuous insulation layer and sealed joints provides superior airtightness compared to traditional discontinuous insulation methods. The system integrates the insulation material into the structural assembly, creating a continuous thermal and air barrier that eliminates thermal bridging and line losses, thereby improving energy performance while remaining cost-effective through reduced heat loss.
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
The solution provides enhanced mechanical stability, airtightness, and fire-proofing, reducing heat losses and condensation by maintaining a λ-value equivalent to mineral wool, while supporting dynamic loads and wind pressures, thus meeting national and international building standards.
Implementation Method 1
said screwable plates being glued on the insulation layer
Implementation Method 2
coated with a thin layer of a highly adhesive mineral render reinforced with a glass fibre net, which makes the rabbet element very fire-proof
Implementation Method 3
a rabbet element comprising an insulation layer... maintains a λ-value equivalent to mineral wool
Data Source
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AI summary
A rabbet element (1) for doors and windows, said rabbet element (1) comprising an insulation (2), where at least two sides of the insulation (2) have screwable plates (3) glued thereon. The invention also relates to a method of mounting the rabbet element (1) as well as use of the rabbet element. The said rabbet element (1) and the said method ensure complete airtightness between windows and doors and the facade plane, so that national and/or international requirements with respect to the airtightness of buildings may be observed. Also, line loss (heat loss in the edge zones) around windows and doors is prevented, thereby obviating the risk of draught, condensation and heat loss.