Corrugated Sheet Fastener Assembly for Windproof Waterproof Fixing
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Solution Overview
Problem
Existing fastening systems for corrugated sheet roofs, such as those using threaded screws, are not sufficiently secure, allowing rain to enter and may not withstand strong winds, posing risks to structures and safety.
Innovation Solution
A fastener system comprising a cylindrical assembly of elongated, plate-shaped fastening members with hooks, a retainer ring, elastic member, sealing members, and an expansion nut, which provides enhanced structural strength and waterproofing by securing the corrugated sheet to a steel member and support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If threaded fasteners (screws) are used to fasten corrugated sheets, then the fastening process is simple, but the structural strength and security are insufficient, allowing rain infiltration and potential sheet detachment in strong winds
Solution Approach 1:
The fastening system is divided into multiple functional components: a cylindrical assembly with plate-shaped fastening members forming hooks, a retainer ring, elastic members, sealing members, and an expansion nut. This segmentation allows each component to perform its specific function while collectively providing both simple installation and high structural strength.
Solution Approach 2:
The fastening members are nested within the cylindrical assembly, with the retainer ring holding the elastic members which in turn hold the sealing members. The expansion nut is threaded onto the bolt and expands within the cylindrical assembly. This nested structure enables compact design while maintaining structural integrity and waterproofing capabilities.
2Ease of operation
If threaded fasteners are used, then installation is straightforward, but waterproofing is insufficient allowing rain to enter through the joining portion
Solution Approach 1:
Sealing members (first and second sealing members) are introduced as intermediary elements between the fastening system components and the corrugated sheet. These sealing members specifically address the waterproofing requirement by creating water-tight barriers at critical interfaces, while the overall system maintains ease of installation through the modular design.
Solution Approach 2:
The sealing members are implemented as flexible ring-shaped elements that can deform to conform to the interfaces between fastening components and the corrugated sheet. This flexibility ensures effective sealing even with minor variations in surface geometry, preventing rain infiltration while maintaining installation simplicity.
3Reliability
If a complex fastening system with multiple components is used to enhance security and waterproofing, then structural strength and waterproofing improve, but device complexity increases
Solution Approach 1:
Multiple functional requirements are merged into a single integrated fastening system. The cylindrical assembly combines the fastening members, retainer ring, elastic members, and sealing members into one pre-assembled unit that is installed as a single component set. This merging reduces the practical complexity of installation while maintaining all necessary functions for security and waterproofing.
Solution Approach 2:
The fastening system is designed to perform multiple functions simultaneously: the fastening members provide mechanical anchoring, the retainer ring provides structural support, the elastic members provide tension and sealing pressure, and the sealing members provide waterproofing. This multi-functionality is achieved within a unified design that does not significantly increase installation complexity.
4Quantity of substance
If conventional fasteners are used, then material usage is minimal, but the fastening is insufficient to withstand heavy winds and protect against sheet detachment
Solution Approach 1:
The fastening system incorporates dynamic elements including elastic members that can deform and recover, and an expansion nut that expands radially to lock the fastening members in place. These dynamic features enable the system to adapt to wind loads and maintain stable fastening without requiring excessive material quantity.
Solution Approach 2:
The fastening system uses a composite structure combining metal fastening members with elastic sealing elements and plastic or rubber sealing members. This composite approach provides both the strength needed to withstand wind loads and the flexibility needed for effective sealing, optimizing material usage while ensuring fastening stability.
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 system effectively prevents water intrusion and enhances structural integrity, enabling buildings to withstand heavy rain and winds, ensuring safety and durability.
Implementation Method 1
a ring-shaped elastic member secured to the curved groove
Implementation Method 2
an expansion nut having a multi-sided outer surface and moveably secured to the threaded bolt, with the expansion nut being surrounded by the hooks
Implementation Method 3
a first sealing member put on a peripheral surface of the retainer ring
Data Source
AI summary
A fastener for a corrugated sheet includes a cylindrical assembly including elongated, plate shaped fastening members assembled as a hollow cylinder. Each fastening member is tapered to one end to form a hook at one end and having a curved groove on an outer surface, and a curved trough on the outer surface at the other end of the fastening member. The curved troughs are assembled to form an annular recess. A retainer ring is secured to the annular recess. A ring-shaped elastic member is secured to the curved groove. A first sealing member is put on the retainer ring. A threaded bolt driven through a washer, the retainer ring, and the fastening member. An expansion nut has a multi-sided outer surface and is moveably secured to the threaded bolt.