Anchoring System With Coil Spring Shaft For Seismic Resilience
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Solution Overview
Problem
Conventional anchoring systems fail to withstand load peaks during earthquakes, leading to inadmissible stresses and potential building collapse due to movements between attachments and walls.
Innovation Solution
An anchoring system featuring a coil spring as the primary component of the pin or shaft, providing resilience and sufficient movement to prevent fracture, with optional damping elements for vibration absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional rigid pin or shaft is used in the anchoring system, then the structure provides stability and fixed positioning, but it cannot withstand load peaks during earthquakes and leads to fracture due to inadmissible tensile and bending stresses
Solution Approach 1:
The pin or shaft is replaced by a coil spring, fundamentally changing the mechanical parameter from rigid to elastic. This allows the anchoring system to deform under load peaks during earthquakes, absorbing energy through elastic deformation rather than fracturing. The coil spring maintains play-free connection while accommodating movement, resolving the contradiction between reliability under seismic loads and strength against tensile/bending stresses.
Solution Approach 2:
The static rigid pin is replaced by a dynamic coil spring that can adapt its deformation to the applied loads. During earthquakes, the coil spring dynamically adjusts its compression and expansion to accommodate axial and transverse movements, preventing the inadmissible stresses that would cause fracture in a rigid system while maintaining reliable anchoring.
2Reliability
If the pin or shaft is made sufficiently long to allow yielding and flexing during earthquakes, then the system can accommodate seismic movements, but the length of the pin or shaft increases
Solution Approach 1:
By changing the material parameter from rigid to elastic (using a coil spring), the system achieves the required movement accommodation in a compact form. The coil spring's elastic deformation capability provides the necessary yielding and flexing during earthquakes without requiring excessive length, as the spring's coiled structure efficiently packs the deformation capacity into a shorter overall length compared to a rigid beam of equivalent flexural capacity.
3Reliability
If a coil spring is used to provide resilience and movement, then the system can absorb seismic loads and prevent fracture, but the coil spring may have play or looseness in the connection
Solution Approach 1:
The coil spring is pre-compressed or pre-tensioned during installation to eliminate play and ensure a play-free connection under normal service conditions. This preliminary cushioning allows the spring to maintain firm contact and stable positioning during everyday use, while still having sufficient elastic capacity to absorb seismic loads and accommodate movements during earthquakes without developing looseness or play.
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 absorbs seismic loads and vibrations, ensuring the anchoring system remains play-free and flexible, thereby preventing structural failure and collapse.
Implementation Method 1
a coil spring (8) which forms the substantial component of the pin (25) or shaft for the purpose of carrying load
Implementation Method 2
a damping element inserted into the coil spring serves for vibration absorption in the case of impact loads as generated in the event of earthquakes
Data Source
AI summary
The disclosure relates to an anchor system having an internally threaded anchor and a bolt or shaft screwed together with said anchor for holding an add-on component in a hole that is pre-drilled into a wall made of concrete or brick work, characterized in that the bolt of shaft comprises a coil spring which is wound suitably to the inner thread of the internally threaded anchor and screwed into said inner thread.