Rockfall Fence with Breaking Attachment Wire Net
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Solution Overview
Problem
Existing rockfall protection and avalanche prevention fences lack efficiency in absorbing energy from rockfalls and accommodating irregular snow accumulation, which can lead to structural deflection and potential failure.
Innovation Solution
A common-use rockfall protection and avalanche prevention fence is designed with terminal struts, a plane member, intermediate struts, and an attachment wire net. The attachment wire net has a breaking load smaller than the plane member, allowing it to break under collision energy from rockfalls while remaining intact under snow pressure, enabling the plane member to slide and absorb energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the attachment wire net has high breaking load to prevent snow pressure deflection, then snow accumulation resistance is improved, but rockfall collision energy absorption capability deteriorates
Solution Approach 1:
The patent applies parameter changes by designing the attachment wire net with a specific breaking load that is lower than the plane member's breaking load. This parameter differentiation allows the attachment wire net to break under rockfall collision energy (enabling energy absorption through plane member sliding) while remaining intact under snow pressure (maintaining structural stability).
Solution Approach 2:
The patent implements dynamics by creating a system where the attachment wire net can transition from a fixed state (under snow pressure) to a broken state (under rockfall collision). This dynamic behavior allows the plane member to slide along the intermediate strut during rockfall events, converting kinetic energy into work done during sliding, thereby improving energy absorption capability.
2Stability of the object's composition
If the plane member is fixed rigidly to intermediate strut, then structural stability is improved, but energy absorption capability during rockfall deteriorates
Solution Approach 1:
The patent applies dynamics by designing the attachment wire net to break under rockfall collision energy, allowing the plane member to slide along the intermediate strut. This sliding mechanism converts the rigid fixed connection into a dynamic system that can absorb energy through friction and deformation during sliding, while maintaining structural stability during normal conditions.
Solution Approach 2:
The patent converts the potentially harmful effect of rigid fixation (which prevents energy absorption) into a beneficial mechanism by designing the attachment wire net to break in a controlled manner. The breaking of the attachment wire net is not a failure but a designed feature that enables the plane member to slide and absorb rockfall energy, transforming a static structure into an energy-dissipating system.
3Strength
If individual components have high structural requirements, then fence strength is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the fence into distinct components with different functional requirements: the plane member is designed with high strength to withstand rockfall, while the attachment wire net is designed with lower strength to enable controlled breaking. This segmentation allows each component to be optimized for its specific function rather than requiring all components to meet the highest strength requirements.
Solution Approach 2:
The patent implements parameter changes by assigning different breaking load parameters to different components. The plane member has a higher breaking load parameter, while the attachment wire net has a lower breaking load parameter. This parameter differentiation reduces the structural requirements for individual components compared to a uniform high-strength design, thereby reducing manufacturing cost and complexity while maintaining overall fence strength.
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 fence effectively absorbs rockfall collision energy across its entire length, reducing the structural requirements of individual components and enhancing the fence's ability to prevent deflection from irregular snow accumulation, thus providing robust protection for both rockfall and avalanche scenarios.
Implementation Method 1
when receiving predetermined collision energy at a time of collision of a rockfall, fixing by the attachment wire net is broken, and the plane member is configured to slide with respect to the intermediate strut
Implementation Method 2
when receiving a snow pressure due to accumulated snow, sliding of the plane member with respect to the intermediate strut is suppressed by the attachment wire net
Data Source
AI summary
To provide a common-use rockfall protection and avalanche prevention fence which can efficiently absorb the energy of rockfalls and which is more suitable as a protection fence having both functions of rockfall protection and avalanche prevention.A common-use rockfall protection and avalanche prevention fence includes terminal struts installed at both ends; a plane member fixed to the terminal struts and deployed between the terminal struts; an intermediate strut disposed between the terminal struts; and an attachment wire net for fixedly attaching the plane member to the intermediate strut, a breaking load of fixing of the attachment wire net being smaller than a breaking load of the plane member.