Bosai Solution ID : JBP00004

Implant™ Landslide Prevention
Highly Resilient Restraining Wall for Landslide Prevention

HazardEarthquake Land Slide Cyclone

Solution Purpose
Prevention & Mitigation Response Recovery

Solution Theme
Infrastructure Technology

Technology Subject
Sabo Road Railways Essential Utilities Urban＜ Downloaded from www.bosai-jp.org ＞

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Advantages
The combination of the Implant Deterrence Piles and Implant Retaining Walls will prevent landslidecaused by massive earthquakes and torrential downpour. The piles embedded into stable ground holdsoils and allow excessive ground water to flow down through pile gap. All construction procedures arerapidly carried out on top of the piles without disturbance of daily lived and surrounding environment.

Solution Illustrated
Prevention of Landslide
Deterrence piles
embedded into the stableground hold soils andeffectively allow excessive
ground water to flow
down through pile gaps.
At the same time,
continuous sheet piles
holds slope collapsing.
They are pressed-in fromthe top of pile wallwithout disturbance ofdaily lives andsurrounding environment.

Effective Design of Restraining Wall
Resilient Implant Restraining Wall is flexibly designed by combination of large preventive piles (max.
diameter 2500mm) installing with appropriate gaps and continuous retaining walls by sheet piles inorder to prevent landslide caused by strong earthquakes and torrential downpour.
Rapid Construction by Direct Installation
Implant Restraining Wall is constructed by a single sequence of events due to direct installation of wall
elements. Even if underground obstacles exist, restraining wall can be rapidly completed in the shortest
possible time. Speed is one of the most important factors for disaster prevention work.
Sustainable Infrastructure
Implant Structure embodies a concept of “Functional Structure™” that has a sustainable life cycle fromdesign, development, construction, operation of function, review of function, removal, transfer toanother place and re-use for another purpose at the end of its life. Implant Wall is the key to sustainable
development for the future generations.

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Background
Frequent Occurrence of Natural Disaster
Because of geographical, topographical andmeteorological conditions, Japan is subject tofrequent natural hazards such as typhoons,torrential rains, landslides, earthquakes andvolcanic activities. Every year there is a greatloss of people's lives and property due tosuch disasters. Countermeasures are taken
based on disaster management related laws,
for example Erosion Control Act (1897),
Landslide Prevention Act (1958), Disaster
Countermeasures Basic Act (1961), Act on
Prevention of Steep Slope Collapse Disaster (1969), Act on Special Measures for Active
Volcanoes (1973) and Act on Promotion ofSediment Disaster Countermeasures forSediment Disaster Prone Areas (2000).

Environmentally Friendly Press-in Method
Restraining wall is one of effective countermeasures to prevent landslides, but construction work withlarge conventional rigs is not practical on slope, unlevelled ground and very confined site. In 1975,
GIKEN invented the world’s first reaction-based press-in machine “SILENT PILER” that utilises reaction
force derived from fully installed piles and hydraulically jacks subsequent piles. Since all pilingprocedure is systematically carried out on the top of pile wall, restraining wall can be rapidly
constructed silently and vibration-free without temporary platforms. This “Press-in Method” enables
restraining wall to be implemented over all phases of landslide prevention from mitigation to recovery.

Exposition of the Solution
Implant Structure (Principle)
Implant Structure consists of an allowable structural member that is combined with structural andfoundation elements that are pressed deep into the ground where they are securely supported by theEarth. The structure carries horizontal and vertical loads, using the “size of section” and “depth ofpenetration”. As a result, it is highly resistant to ground displacement caused by external forces, serving
as a “resilient” disaster-prevention infrastructure.
Implant Restraining Wall for Prevention and Mitigation (Guard Method™)＜ Downloaded from www.bosai-jp.org ＞

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Implant Wall constructedby “Press-in Method”
performs as restraining
wall of “Guard Method”
that is developed to carryout protective work in
advance of theoccurrence of landslides.
As all necessary press-inmachinery systematicallyworks on the top of pile wall, it minimises working space down to just contacted area of piles on theground and eliminates a need for temporary platform even on slope, unlevelled ground and above water.
Implant Restraining Wall for Response and Recovery (Rescue Method™)
Implant Wall is also applied to "Rescue Method" that is developed to minimise the damage by taking
immediate action with simple press-in procedure at the occurrence of unpredictable natural disasters.
When situation is changed after recovery, the wall can be removed for other purposes or replaced toother places.

Achievements of Examples
As GIKEN has been
contributing to disastermanagement and risk
reduction since 1975, an
enormous number of
Implant Wall has been
constructed over 36
countries worldwide by
420 users of the SilentPiler. It has been
implemented to river revetment, road retaining wall, railway embankment wall, landslide restraining wall,
bridge foundation, reinforcement of structures and so on. One example of various difficult projects is
introduced as follows.
Urgent Construction of Implant Training Wall in Izu-oshima Island, Tokyo
In October 2013, the season’s 26th typhoon attacked Izu-oshima Island and recorded the maximum
ever rain fall in the area. Especially the Okanazawa district was suffered from a large scale erosion andlandslide. According to urgent countermeasures to minimise further risk planned by Tokyo Metropolitan
Government, GIKEN provided Implant Wall as use of temporary training wall to protect residential area.
Because of volcanic island, there were very hard lava beds underlying in the ground and the sloping
surface was irregularly unlevelled and unstable. Under such difficult site conditions, press-in work wascarried out by two units of “CRUSH PILER™” that was specially developed for penetration into hardground and successfully completed the required construction work accurately and swiftly.

Corporate Profile＜ Downloaded from www.bosai-jp.org ＞

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GIKEN LTD.
16F Ariake Central Tower, 3-7-18 Ariake, Koto-ku, Tokyo 135-0063, Japan Tel. : E-mail : international@giken.com
 Website : https://www.giken.com/en/＜ Downloaded from www.bosai-jp.org ＞

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