Dormer with Pivot Barrel Roof for Variable Pitch Installation
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Solution Overview
Problem
Existing dormers with barrel roofs are not adaptable to varying roof inclinations, requiring different designs for each pitch and lacking a seamless integration with the roof structure for optimal ventilation and daylighting.
Innovation Solution
A prefabricated dormer with a barrel roof and a window that rotates around a horizontal axis, featuring an obtuse angle between the front side and the roof ridge, allowing for adjustable installation on roofs with inclinations up to 30°, combined with a sealing system that integrates with the roof deck for waterproofing and thermal insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dormer with barrel roof is designed for a specific roof pitch, then it provides proper structural integration and appearance, but it cannot be adapted to roofs with different inclinations
Solution Approach 1:
The dormer front side is designed with a pivot connection to the barrel roof, enabling it to rotate around a horizontal axis. This dynamic adjustment allows the front side to maintain a vertical orientation while the barrel roof adapts to different roof pitches, resolving the contradiction between adaptability and structural complexity
Solution Approach 2:
The angle between the front side and the barrel roof ridge is set to an obtuse angle (100°-130°), which changes depending on the roof inclination. This parameter adjustment allows the same dormer structure to be installed on roofs with varying pitches while maintaining proper geometry and appearance
2Adaptability or versatility
If the dormer front side is positioned vertically with a fixed angle to the barrel roof, then it provides a clean appearance and proper window installation, but it cannot accommodate different roof pitches
Solution Approach 1:
The pivot connection between the front side and barrel roof enables dynamic adjustment during installation. The front side can be positioned at different angles relative to the barrel roof ridge, allowing installation on roofs with pitches varying by up to 30° while maintaining the vertical appearance of the front side
Solution Approach 2:
The dormer is designed as a prefabricated unit with the pivot connection pre-assembled, allowing for easy on-site installation. The components are prepared in advance with proper geometry, enabling quick adaptation to different roof pitches without complex on-site fabrication
3Reliability
If the window is installed with pivot action rotating around horizontal axis, then it provides effective ventilation and daylighting, but it requires precise positioning of hinges above half the window height
Solution Approach 1:
The hinges are positioned at a specific parameter location: above half the window height between the center line and top rail. This precise positioning ensures proper pivot action for effective ventilation and daylighting while maintaining manufacturing feasibility through standardized hinge placement guidelines
Data Source
Figure 1
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AI summary
A dormer with side walls (1) and a barrel roof (2), With an obtuse angle (a) between the front side of the dormer and the ridge of the barrel roof The dormer comprises a window on its front side, with an arched top edge, fitted to the dormer roof arch (2), opened by the rotation of its sash (5) around its horizontal axis, where said sash is seated in hinges (6) fixed to the stiles (32) of the sash frame. The design of the window in the dormer is typical for roof windows.