Expansion Joint Cover Plate with Spring Biasing and Adjustable Compression
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Solution Overview
Problem
Existing expansion joint systems for building structures face challenges in maintaining a consistent seal and accommodating movement due to thermal changes and earthquakes, as they lack adjustable biasing forces and simplified assembly mechanisms.
Innovation Solution
A spring-based expansion joint cover plate assembly that includes support plates, centering bars, translation rods, and a spring plunger system, allowing for adjustable compression and easy assembly, which biases the cover plate against support surfaces and maintains the centering bars in position, even as adjacent structures move.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring-based biasing system is implemented, then the cover plate is maintained against support surfaces and centering bars are positioned, but the device complexity increases due to additional components like spring retainers and translation rods
Solution Approach 1:
The biasing system is divided into modular components: spring assemblies with retainers, translation rods, and catch mechanisms. Each component performs a specific function and can be assembled independently, reducing overall system complexity while maintaining reliability
Solution Approach 2:
The spring assemblies are pre-compressed and secured by retainers before final installation. The translation rods are pre-positioned with catches that engage with the spring plunger, ensuring the biasing force is already prepared and positioned correctly before the cover plate is installed
2Adaptability or versatility
If adjustable spring compression is allowed, then the system can accommodate different movement ranges, but the ease of operation decreases due to the need for adjustment mechanisms
Solution Approach 1:
The spring compression is made adjustable through the translation rod mechanism, which allows the spring plunger to be positioned at different distances from the end assembly. This dynamic adjustment capability enables the system to adapt to various movement ranges while maintaining a relatively simple assembly process through the catch engagement mechanism
3Reliability
If one-way catches are used to retain translation rods, then the spring compression is maintained, but the ease of repair worsens due to the difficulty of disassembly
Solution Approach 1:
The translation rods are designed to be extractable from the end assembly by disengaging the one-way catches. This allows the spring assembly to be removed and replaced independently without disturbing other components, facilitating easy maintenance and repair while maintaining reliable spring retention during operation
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 maintains a consistent seal across expansion joints, accommodating structural movement while allowing for easy installation and adjustment, ensuring the cover plate remains centered and securely in place during thermal changes and seismic events.
Implementation Method 1
a spring compressed between the end assembly and the spring plunger such that an end portion of each translation rod is located within a respective catch opening, and the one-way catches engage respective catch openings such that the spring retains a minimum compression between the end assembly and spring plunger
Data Source
AI summary
An expansion joint cover plate assembly for covering a gap between first and second sections of a building formation such as wall, floor or ceiling of a building. The assembly includes a cover plate, a support structure for supporting the plate relative to the building formation and a spring biasing structure for holding the plate against the support structure.