Vertical Rockfall Protection Fence "Slope Guard Fence Type LR"

basic information

The Slope Guard Fence Type LR is composed of posts, wire nets, wire ropes, cushioning devices, and wire mesh. It features a hybrid structure that combines horizontally installed wire ropes and wire nets, efficiently dispersing and absorbing the impact energy when falling rocks collide with the barrier. Additionally, since the wire net is also connected to the upper rope, it helps to prevent a decrease in fence height. The remaining fence height after impact loading tests using actual specimens maintained over 85% of the initial fence height. The "Slope Guard Fence Type LR" has been confirmed to meet the performance requirements specified in the technical standards for road earthworks through impact loading tests conducted with actual specimens. The experiments comply with the conditions for performance verification through testing as outlined in the Rockfall Mitigation Handbook (December 2017 revision / Public Interest Incorporated Association Japan Road Association). *For inquiries or questions regarding products or technology, please feel free to contact us.*

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Applications/Examples of results

Installed near roads close to slopes with the risk of falling rocks and landslides, as well as behind houses.

Detailed information

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  A hybrid structure that can be used for both debris flow and avalanche countermeasures. The blocking surface of the Slope Guard Fence Type LR is a hybrid structure that combines different components of wire rope and wire net installed horizontally. When a load acts on the blocking surface, the wire rope deforms in response to the deformation of the wire net, efficiently absorbing energy across the entire blocking surface and minimizing the amount of deformation. This hybrid structure can accommodate not only falling rocks but also collapsing debris and snow load.

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  **Mechanism of Energy Absorption** In the case of impact loads from falling rocks, the load is transmitted to the wire mesh, wire net, and wire rope, dispersing and absorbing energy. Furthermore, when the tension in the wire rope reaches a certain value, the wire rope in the cushioning device located at the ends begins to slip, absorbing energy through friction. Similarly, when static loads such as accumulated soil or snow are applied, the wire mesh and wire net deform, transmitting the load to the wire rope connected to the wire net, which disperses the load across the entire barrier surface. In the case of static loads, if an external force greater than the design load is applied, the cushioning device at the ends activates, dispersing the load through the slipping of the wire rope.

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  High-strength support member The support member employs a "lotus root-shaped hollow structural steel pipe (LST)" that arranges multiple small-diameter steel pipes or reinforcing bars within an external steel pipe and fills the gaps with mortar. This achieves significantly higher strength and weight reduction compared to conventional concrete-filled steel pipes.

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