Bosai Solution ID : JBP00058

V-JET Technology - Innovative Jet Grouting
Efficient Installation of Large Diameter Jet Grout Column

HazardEarthquake Tsunami Land Slide Storm Surge Flood

Solution Purpose
Prevention & Mitigation Recovery

Solution Theme
Infrastructure Technology Building Technology

Technology Subject
River & Basin Dam & Reservoir Coast Sabo Road Railways Airport Port Essential Utilities Urban
Resilience Improvement on Existing Building＜ Downloaded from www.bosai-jp.org ＞

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Advantages
Innovative Injection device demonstrates a state-of-the-art jet grout technology. V-JET technology
provides large column up to 5.5m in diameter at drastically fast installation rate. Reliable quality of VJET technology improves the existing ground under facilities of river dykes, sea coasts, ports & harvors
and airports and mitigates liquefaction potential.

Solution Illustrated＜ Downloaded from www.bosai-jp.org ＞

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Jet Grout Technology is commonly applied to mitigate soft ground worldwide. V-JET
categorized in this field installs large diameter soil-cement column at fast rate, utilizing
erosion by high-pressured binder fluid with compressed air.

The injection device called to the Monitor is specialized double nozzles on opposite
side of the monitor. The monitor assists to drastic erosion and mixing resulting to larger
column diameter and faster installation than other technology even in harder andstiffer ground.

V-JET system has several option in column diameter and gives the best solution inground treatment to the project requirement.

Background
Upgrade of existing revetment along river needs to renovation of the revetments or to mitigate
foundation performance.
For example, wider revetment or additional foundation pile installation will come as countermeasures.
However, such options do not meet requirements in urban area.
Furthermore, soft and loose ground under revetment will cause serious liquefaction and failure during＜ Downloaded from www.bosai-jp.org ＞

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and after earthquake.
Such soft and loose ground shall be removed and replaced to stable soil after demolishing of existing
revetments and dykes.

Exposition of the Solution
VJET technologies install injection monitor with small diameter drilling. Existing revetment and otherstructures will allow small drilling with small rig. Large diameter jet grout column of VJET compensatesessential performance of the existing foundation piles and mitigate the ground against to failure during
and after earthquake. Excellent injection performance guarantees reliable quality of column even indecomposed rock ground, where conventional jet grout never cover required specification.
In case of liquefaction countermeasure, lattice alignment of soil cement column is commonly designed
in order to save cost of soil cement column. VJET technology clearly contributes to establish the latticealignment due to large diameter column and reliable performance of column wall based on column
stiffness and cut-off property.

Recently V-JET technology has developed Multi Fan technology having unique shape column, which
combines smaller and larger diameter fans. Multi Fan contributes to reduction of wastes and cost in
particular alignment like to wall and lattice alignment.

Achievements of Examples
Application of Lattice Alignment against to Liquefaction＜ Downloaded from www.bosai-jp.org ＞

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Application for Mitigation of Ground Stiffness to Earthquake

Application to Decomposed Granite in Hong Kong

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Application to Soft Ground in Taiwan＜ Downloaded from www.bosai-jp.org ＞

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Other References
Technical Materials
JET GROUT Technical Document；Japan Jet Grout Association (Japanese Edition)
V-JET Technical and Costing Document；V-JET Association (Japanese Edition)TPapers
H. J. Liao et al., 2013, Performance of V-Jet method for arrival of shield tunneling machine/_upload/member/105/files/Geotec_Hanoi-2013_2-06_V-Jet.pdf
T. Shinsaka and J. Yamazaki, 2013, Development of high-speed type jet grouting method/_upload/member/105/files/Geotec_Hanoi-2013_2-06_V-Jet.pdf

Corporate ProfileSanshin Corporation
7F Yanagibashi First Building, 2-19-6 Yanagibashi, Taito-ku, Tokyo 111-0052, Japan Tel. : +81-3-5825-3704
 E-mail : sales@sanshin-corp.co.jp
 Website : http://www.sanshin-corp.co.jp/＜ Downloaded from www.bosai-jp.org ＞

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