Bosai Solution ID : JBP00125

LOOP FENCE
High-performance protection barriers for Rockfall, Shallow landslide, Debris flow,
Avalanche

HazardEarthquake Land Slide Flood Avalanche

Solution Purpose
Prevention & Mitigation Recovery

Solution Theme
Disaster Prevention Plan Infrastructure Technology Building Technology

Technology Subject
Mitigation Plan River & Basin Dam & Reservoir Coast Sabo Road Railways Airport Essential Utilities＜ Downloaded from www.bosai-jp.org ＞

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Urban Facility for Disaster Prevention Design & Construction of Resilient Building Resilience
Improvement on Existing Building

Advantages
LOOP FENCE is a high-performance protection barrier for rockfalls, shallow landslides, debris flow, andavalanches. It consists of internally filled high-strength and high-toughness composite structural steel
pipe posts, wire ropes, mounting fixtures, and nets.
By combining components, LOOP FENCE can be used for a variety of purposes.
In addition, the high-performance posts eliminates the need for additional anchors and minimizes thefootprint for installation.

Solution Illustrated

High-performance posts
High-performance posts which are composite members with steel placed inside and filled with special
filler material, demonstrate excellent performance, combining high strength and high toughness.
Compared to general steel pipes with equivalent flexural rigidity, the required rigidity can be secured
with thinner posts, making it possible to accommodate a variety of construction forms according to siteconditions.
Cable connecting equipment, Main cables
Equipments to mitigate the impact of rockfalls and connection equipments that are easy to install andremove can be attached to the main cable to demonstrate each function according to the type ofdisaster.
Distance keeper, Wire net
Distance keepers maintain even spacing between main cables and use Wire net depending on the sizeof the disaster; these measures can prevent penetration in the event of disaster.

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Background
In Japan, where 73% of the land is mountainous and hilly and where various natural disasters frequently
occur due to earthquakes, heavy snowfall, and torrential rains due to global warming.
It is important to realize a world where they can live with peace of mind by protecting people’s lives andproperty.
Conventionally, countermeasures against relatively large natural disasters such as rockfalls, landslides,
debris flows, and avalanches had to be implemented, such as detouring, tunnel construction, or rocksheds construction. However, the current higher performance of protection barriers have made it
possible to implement protective measures without these large-scale construction.

Exposition of the Solution
Protection barriers for natural disasters require various performances depending on the type of disaster.
Required performance of each component and protection barrier differs depending on the type ofdisaster, therefore, it’s important to make a best-suited barrier according to each different condition.
LOOP FENCE can be customized to optimal specifications for each type of disaster, backed byexperiments on each component to use, full-scale tests on the assembled protection barrier, andvarious types of structural analysis.

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Achievements of Examples
Cumulative results in Japan ： 1,660 cases (90,480 meters)
Cumulative results outside Japan ： 4 cases (1,368 meters)＜ Downloaded from www.bosai-jp.org ＞

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Corporate Profile
Vertex Co., Ltd
5-7-2 Kojimachi, Chiyoda-ku, Tokyo, 102-0083, JAPAN Tel. : +81-3-3556-2801
 E-mail : hi-minami@vertex-grp.co.jp
 Website : https://vertexgrp.co.jp/＜ Downloaded from www.bosai-jp.org ＞

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