Sliding Anchor Clip System for Thermal Movement and Wind Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current roofing and wall systems face limitations in wind resistance, thermal movement accommodation, and material gauge usage due to conventional attachment methods that lead to water leakage, structural overstress, and directional movement restrictions, particularly with R-panels and standing seam panels.
Innovation Solution
A wrap-around clip system utilizing shear resistance instead of pull-out forces, allowing 360-degree movement and superior attachment strength, which includes an anchor plate, sliding anchor, and support grid, enabling the use of thicker gauge metals and longer panel lengths while preventing water leakage and structural overstress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional screw attachment methods are used through R-panels, then panels can be fastened to structural members, but water leakage occurs due to thermal movementę§½ting of the panel and wind resistance is limited to 220 psi
Solution Approach 1:
The attachment system is divided into separate functional components: the R-panel, the clip assembly (comprising a body portion and a sliding anchor), and the structural member. This segmentation allows the panel to remain intact while the clip assembly accommodates thermal movement and provides enhanced wind resistance through shear connection.
Solution Approach 2:
The clip assembly serves as an intermediary between the R-panel and the structural member. It transfers loads through shear resistance rather than pull-out forces, preventing water leakage by avoiding panel slotting while providing superior wind resistance capacity.
2Length of moving object
If R-panel lengths are extended beyond 40 feet, then longer spans are achieved, but thermal movement causes severe slotting around screws exceeding washer circumference
Solution Approach 1:
The sliding anchor within the clip assembly is designed to move dynamically along the R-panel rib as thermal expansion and contraction occur. This dynamic adjustment prevents fixed screw positions from causing panel slotting, allowing long panel spans to accommodate thermal movement without water leakage.
3Strength
If 22-gauge metal is used to achieve 185 mph wind ratings, then wind resistance is improved, but heavier gauge metals cannot be used without exerting destructive thermal movement on substructure
Solution Approach 1:
The attachment mechanism replaces pull-out resistance (screw threads engaging the panel) with shear resistance (the clip assembly shearing against the structural member). This mechanical substitution allows heavier gauge metals to be used because the shear connection accommodates thermal movement without exerting destructive forces on the substructure.
4Strength
If normal roof clips are used on standing seam panels, then panels can be attached, but thermal expansion and contraction are restricted to only the length direction
Solution Approach 1:
The sliding anchor moves along the R-panel rib in response to thermal phase changes (expansion and contraction). This movement capability in multiple directions allows the system to accommodate thermal transitions without restricting the panel's natural movement patterns.
Data Source
AI summary
A metal roof construction provides a roof frame that includes multiple rafters. A plurality of clips or anchor plates are fastened to each rafter. Each anchor plate or clip has an anchor plate space surrounded by one or more plate members. The anchor plate has a plurality of spaced apart openings. A sliding anchor occupies the anchor plate space. Each sliding anchor has multiple spaced apart pedestals that extend from the anchor plate space upwardly through an opening. Multiple roof decking sections are mounted on the rafters. Each decking section extends under a part of the anchor plate. The anchor plate has one or more flaps that extend downwardly from the decking sections and next to a rafter. Fasteners attach each flap to a rafter.