The Technical Research Institute

The Technical Research Institute undertakes R&D to support
our three businesses: Civil Engineering,
Ground Improvement and Blocks & Environment.

Our laboratory was established in 1969. In Japan, around that time, concrete blocks began to be used. The initial focus of our research was to ensure effective use of Tetrapod on site. Over the years, many positive results relating to the concrete blocks and the formations they create along coasts and around harbors have been reported, indicating that they have greatly benefited society.

In 2018 the Technical Research Institute made a fresh start in a wider role: R&D related to all three of our core businesses, civil engineering, ground improvement and blocks & environment. Fudo Tetra has helped in many ways to build Japan’s social infrastructure, and has a portfolio of civil engineering technologies on land—for highways, railways and energy facilities among others—and offshore—for ports and airports and man-made islands.
Our success in 1956 in developing the world’s first sand compaction method was followed by continuing research and development, and out of this expertise in ground improvement we have compiled a wealth of design and construction technologies as well as a strong record of actual site applications.
The Technical Research Institute will continue to expand the breadth and depth of our technologies and skills, and from our own technical innovations we trust we can make more contributions in the future in fulfilling society’s and our customers’ requirements.

Brochure (3MB)

Research Groups

Fudo Tetra’s R&D activities are centered on our company businesses, for which we have our own technologies and knowhow. In civil engineering this means land and sea civil engineering construction and environmental restoration technologies, in ground improvement we focus on ground improvement technologies related to sand piles and solidification processes, and in the blocks & environment business, in wave-dissipating and armor blocks for coastal and harbor formations.

Maritime and Coastal Hydraulics Group

Research Groups

This Group undertakes research into the hydraulic stability and hydraulic performance of wave-dissipating concrete blocks exposed to wave action and currents in the ocean and in rivers. We make full use of our four wave flumes to better understand hydraulic phenomena, and use numerical analysis to investigate their mechanisms for practical and meaningful research. In coastal developments, the local environment and its ecology must be taken into account. For concrete block development we use forms that are environment-friendly, and after installation, we monitor over the long term to check their environmental symbiotic effect: whether seaweeds and corals have become established, for example. We are also researching measures to rectify the loss in recent years of seaweed beds in all parts of Japan related to the rise in seawater temperature.

  • Hydraulic model experiment of wave-dissipating concrete block stability

  • Numerical analysis (velocity field around breakwater)

  • Seaweed established on Permex

  • Coral growing on Tetrapod

Environmental Restoration Group

Research Groups

In this Group, we are developing new technologies related to environmental restoration projects.
In recent years we have concentrated efforts on soil decontamination work, largely working on the development of chemical agents and decontamination methods. We have use of the Materials Chemistry Laboratory for indoor tests on the development of new chemical agents, analytical tests, recording results and so on, and for decontamination testing using large scale implementation equipment we use No. 3 Laboratory Building.

  • Diagrammatic soil decontamination

  • Advection diffusion analysis

Ground Improvement Group

Research Groups

The Ground Improvement Group undertakes R&D for new technologies related to ground improvement projects.
Fudo Tetra has more than 50 different types of ground improvement methods, and deals with the challenges of every type of ground. For development of new technologies, indoor tests on ground materials are carried out in the Materials Chemistry Laboratory. The Laboratory Building is used for small-scale soil tests and to check the action of implementation equipment, and we also use the Multi-purpose Outdoor Test Space for full-scale tests replicating site conditions using actual installation rigs.

Structural Mechanics Group

Research Groups

This Group studies the structural strength of environmental blocks. Wave-dissipating blocks need to have sufficient strength to preclude damage from wave action, but the structural performance of these blocks is still not entirely clear. For greater understanding we use full-sized blocks in static loading tests and dropping tests, as well as structural analysis.

  • Tetrapod dropping test

  • Static loading test on Tetrapod

To implement in wave-dissipating work the policy initiative of the Ministry of Land, Infrastructure, Transport and Tourism to make full use of ICT, we are collaborating with the technology department for our civil engineering business to study greater use of CIM, and the use of ICT in maintenance management for wave-dissipating projects.

Fundamental Technologies Group

Research Groups

This Group is studying general-purpose technologies to be used over the medium to long term.
Our work covers research into the effective use of marine resources, measures to prevent the loss of sand beaches brought about by sea level rise due to global warming or by stronger wave action, and technical developments leading to higher productivity or labor saving to combat the fall in Japan’s working-age population due to the low birth rate and aging society.

Intellectual Property Group

Research Groups

We undertake the administrative work related to industrial property rights such as patents, design rights, and trademarks.
While the positive outcomes of research and development into civil engineering, groundwork and environmental blocks must be properly protected, we aim to open up further business opportunities through their effective use.

Main Facilities

When it opened in 1969 this Research Institute possessed 1 wave basin and 1 wave flume for our initial research. The scope of our research has subsequently been considerably diversified, and we have increased the number of wave flumes. At an early stage we installed irregular wave-making and multidirectional irregular wave-making technology to meet more sophisticated and more exacting methods of block formation design. Currently we use 4 wave flumes set up in our No. 1 and No. 2 Buildings for research in fields of maritime and coastal structures.
In 2017 we created a multipurpose outdoor test space for ground improvement research. This has enabled us to create test grounds, changing the soil to match the required conditions for tests to check the improvement effect of new methods. Development is speeded up with more reliable validation of improvement effect through testing under set ground conditions and with fewer limitations on test procedures.
In 2018 a third laboratory building and a materials chemistry laboratory were opened for research into technologies for land-based and offshore civil engineering, environmental restoration and ground improvement, and they are now in use for various types of indoor testing.

No. 1 Laboratory Building / Hydraulic Testing Facility

This facility contains 4 wave flumes each equipped with an irregular wave-generating device. In all 4 flumes we have also installed the latest reflected wave absorbing type of wave-generating control system, which was developed at the University of Aalborg in Denmark, to enable high precision experiments of irregular wave action.

1st large wave flume:
Dimensions: 55m long x 1.2m width x 1.5m deep
Wave-generating device piston type (AC servo motor drive)
Wave type regular waves, irregular waves
Wave-generating capacity regular waves max. wave height H=50 cm
2nd large wave flume:
Dimensions: 50m long x 1.0m wide x 1.5m deep
Wave generating device piston type (AC servo motor drive)
Wave type regular waves, irregular waves
Wave-generating capacity regular waves max. wave height H=50 cm
max. significant wave height H1/3=30cm

*Equipped with tsunami generating devices (pump-type, chamber type)

No. 2 Laboratory Building

This building is equipped with 2 wave flumes and structural testing facilities. The wave flumes have the latest reflected wave absorbing type of wave-generating control system installed, to enable high precision experiments of irregular wave action. In the structural test facility, tests are carried out using actual size large blocks.

Mid-size flume:
Dimensions: 50m long x 1.0m wide x 1.3m deep
Wave generating device piston type (AC servo motor drive)
Wave type regular waves, irregular waves
Wave-generating capacity egular waves max. wave height H=40 cm
max. significant wave height H1/3=25cm
Small wave flume:
Dimensions: 29m long x 0.5m wide x 1.0m deep
Wave generating device piston type (hydraulic drive)
Wave type regular waves, irregular waves
Wave-generating capacity regular waves max. wave height H=30 cm
max. significant wave height H1/3=15cm
Structural test facility

Fitted with a loading test device, 1,000kN compression test device, and crane.

No. 3 Laboratory Building

This building is used for all sort of tests and checks of performance that require an extensive interior space.

Exterior view / Interior view
Ground Improvement Group:

Tests using small experimental soil tanks, and performance checks for single elements of machinery.

Environmental Restoration Group:

Effectiveness of decontamination methods shown in the lab may drop as their application is scaled up, therefore large-scale tests are conducted to check that the effect does not change when using implementation equipment.

Materials Chemistry Laboratory

This laboratory is used for testing chemical agents and materials used in various civil engineering methods, property tests after field experiments, and analysis of samples collected from sites. It is equipped with the necessary instruments and storage for reagents.

Exterior view
Ground Improvement Group:

Blending tests for fluidized sand used in the SAVE-SP method, blending tests for soil mixed with hardening agent and other basic tests.

  • Groundwork Group Testing Equipment

Environmental Restoration Group:

Indoor tests to develop decontaminating agents and methods, and analysis of contaminated soil samples collected from sites. The necessary reagents, and equipment required for chemical analysis and many other types of testing are available.

Multi-purpose Outdoor Test Space

In the development process for new ground improvement methods, full-scale site testing is essential to check the method’s improvement effect and implementation performance. However, it is not easy to find test sites at the required time and location with the appropriate ground conditions.
We have therefore created a multi-purpose test space at the Technical Research Institute and are able to create test grounds by switching the soil to match the test requirements. Thus, it becomes possible to see the effectiveness reliably with no restrictions on the testing procedure, and the development process can be speeded up.

  • View of testing

  • Digging out test piles for inspection

Horikawa Library

The Horikawa Library was established in April 1995 within this institute to house and preserve the collection of Dr. Kiyoshi Horikawa, Doctor of Engineering. It contains some 14,000 volumes of important books and documents from Japan and overseas that Dr. Horikawa collected throughout his professional life in the course of his wide-ranging research. Since its opening, as well as Fudo Tetra staff the library has been used by large numbers of researchers.
For further details please contact the Technical Research Institute.

Kiyoshi Horikawa

Present positions: Member, The Japan Academy; Professor Emeritus, University of Tokyo; Professor Emeritus, Saitama University; Professor Emeritus, Musashi Institute of Technology
Dr Kiyoshi Horikawa is a leading research engineer in coastal engineering working not just in Japan but worldwide, and has headed research in this field over many years. He has also made major contributions in education, at the Council for University Chartering and Incorporated Educational Institutions.

Published papers

Title Authors Source of reference
CI-CMC-HG工法(超硬質地盤に適応した大径深層混合処理工法)田中肇一,伊藤竹史,武田尚也月刊「建設機械」2020年4月号 pp.68-72
細粒分混り砂の異方応力状態による液状化過程の損失エネルギー特性石川敬祐(東京電機大),原田健二,安田進(東京電機大),出野智之,町田亘(東京電機大)第55回地盤工学研究発表会 21-2-2-01
細粒分を含む砂質土のN値と液状化強度に及ぼす水平応力比の影響原田健二,石原研而(中央大),矢部浩史第55回地盤工学研究発表会 21-11-2-04
ソイルセメントにおける任意材齢強度と 28 日強度の関係堀内滋人,村上恵洋,尾形太,出野智之,伊藤泰隆第55回地盤工学研究発表会 2222-29-08
セメントスラリーの流動性に対する水セメント比と温度の影響村上恵洋,伊藤竹史第55回地盤工学研究発表会 22-10-1-04
締固め方法が改良地盤の微視構造変化に及ぼす影響江副哲,梅田洋彰,大谷順(熊本大),佐藤宇紘(熊本大),原田健二第55回地盤工学研究発表会 22-10-1-06
撹拌翼先端の水空気吐出装置による深層混合改良体強度への影響中野武大,村上恵洋,田中肇一第55回地盤工学研究発表会 22-10-1-07
硬質地盤に対応した深層混合処理工法の開発武田尚也,田中肇一,伊藤竹史,田中隼矢第55回地盤工学研究発表会 22-10-4-07
締固め砂杭打設を模擬した水平地盤模型の振動台実験日下部真佑,古関潤一(東大),原田健二第55回地盤工学研究発表会 22-11-1-05
高強度地盤改良体に対するせん断波速度の調査と改良地盤の評価について髙山英作,中野佳輔(竹中土木),長田高(昭和試錐)第55回地盤工学研究発表会 23-2-2-02
循環型社会への貢献に取り組んだ締固め砂杭工法矢部浩史,橋本則之,竹内秀克,尾形太地盤工学会誌 2020年8月号 pp.21-24 
粒子構造と粒子形状が液状化強度に及ぼす影響(その2)出野智之,原田健二,矢部浩史,江副哲,日下部真佑土木学会年次学術講演会 (第75回) III-71
細粒分混り砂の異方応力状態における損失エネルギーと体積ひずみの関係石川敬祐(東京電機大),原田健二,安田進(東京電機大),出野智之,町田亘(東京電機大)土木学会年次学術講演会 (第75回) III-74
細粒分を含む砂質土のqc値と液状化強度に及ぼす水平応力比の影響原田健二,石原研而(中央大),矢部浩史土木学会年次学術講演会 (第75回) III-114
締固め砂杭打設を模擬した振動台実験における応力ひずみ関係日下部真佑,古関潤一(東大),原田健二土木学会年次学術講演会 (第75回) III-119
深層混合処理工法における撹拌翼先端吐出の硬質地盤への効果武田尚也,村上恵洋,田中肇一土木学会年次学術講演会 (第75回) VI-140
締固め改良地盤における静止土圧係数の増加が液状化抵抗比に及ぼす影響山下勝司,吉富宏紀,原田健二日本建築学会2020年度日本建築学会大会(関東) pp.547-548
エコガイアストンを利用した効果的な水硬性スラグコンパクションパイル工法伊藤竹史,廣田義一,篠崎晴彦・太田哲郎(日本製鉄)水底質浄化技術協会誌「ヘドロ第137号」 pp.46-51
Mechanism and future risk of slope instability induced by extreme rainfall event in Izu Oshima Island, Japan東畑郁生(関東学院大),後藤聡(山梨大),後藤茂(早稲田大),秋間健,田中隼矢,内村太郎(埼玉大),王功輝(京都大),山口弘志(中央開発㈱),青山翔吾(東京大)Natural Hazards pp.501–530
Mechanism of slope disaster caused by extreme rain-fall in Izu Oshima Island, Japan, and future safety judgement東畑郁生(関東学院大),秋間健,後藤聡(山梨大),後藤茂(早稲田大),田中隼矢,青山翔吾(基礎地盤コンサルタンツ)World Landslide Forum 2020 Kyoto Japan pp.121-130
細粒分混り砂の異方応力状態における液状化強度特性と損失エネルギー町田亘・石川敬祐(東京電機大),原田健二,安田進(東京電機大),出野智之2020GEO関東技術発表会 防災3-4
不動テトラの新しいICT地盤改良~自動打設技術とリモート立会い古庄哲士土木施工 令和2年12月号 pp.68-71
打設角度が異なるSCP改良杭の砂地盤上の盛土の沈下挙動に関する遠心模型実験李楊・北詰昌樹・高橋章浩(東工大),大林淳,原田健二第14回地盤改良シンポジウム pp.137-142
リサイクル材料を用いた締固め砂杭(サンドコンパクションパイル)工法 への取組み尾形太,橋本則之,伊藤竹史,竹内秀克,矢部浩史第14回地盤改良シンポジウム pp.143-148
細粒分を含む砂のN 値と液状化強度に及ぼす水平応力比の影響原田健二,石原研而(中央大学),矢部浩二第14回地盤改良シンポジウム pp.487-492
日米の液状化予測と対策の改良効果についての考察原田健二,Orense R. P.(Auckland University)第14回地盤改良シンポジウム pp.593-600
複数本の砂杭打設における水平応力の計測原田健二,矢部浩史,橋本則之,伊藤竹史日本地震工学会大会 B-3-5
液状化対策としての締固め施工時における周辺影響評価解析竹内秀克,野田利弘(名古屋大),河村精一(基礎地盤コンサルタンツ),浅岡顕(地震予知総合研究振興会)地盤工学会誌 2021年2月号 pp.10-13
Enhanced reactivity of dicalcium phosphate dihydrate with fluoride ions by coating with apatite nanoparticles岡嶌夏輝,袋布昌幹,豊嶋剛司(富山高専),髙田将文,萩野芳章Journal of Asian Ceramics Society, Vol. 9, No. 2, pp. 498-506
波浪による消波ブロックのロッキング衝突現象に関する実験的研究昇 悟志,堀内滋人,三井 順,久保田真一,千々和伸浩・岩波光保(東工大)土木学会論文集B3 (海洋開発) (通常号)Vol.76,No.1 pp.33-45
SPH法による消波ブロック群の移動解析の試み三井 順,久保田真一,松本 朗土木学会論文集B2 (海岸工学) Vol.76,No.2 pp.823-828
消波工の断面変形に伴う越波特性の変化に関する実験的検討久保田真一,松本 朗土木学会論文集B3 (海洋開発) Vol.76,No.2 pp.91-96
バージ船から投入された捨石の沈降・堆積過程に関する数値シミュレーション三井 順,田中真史,山崎真史,原 隆土木学会論文集B3 (海洋開発) Vol.76,No.2 pp.504-509
個別のブロックの沈降・堆積挙動に基づく堆積形状予測シミュレーション田中真史,三井 順,川島麻由美,山崎真史,原 隆土木学会論文集B3 (海洋開発) Vol.76,No.2 pp.558-563
だるまカゴ護岸の安定性と砂浜地形変化猿渡亜由未・小林正法・髙須賀啓孝(北海道大),小山裕文・高橋幹夫,山下孝行(北海道川崎鐵網),樋口益盛(トワロン),渡部靖憲(北海道大)土木学会論文集A2 (応用力学) Vol.76,No.2 pp.461-468
根固めブロック周辺の浮遊砂堆積を促す効果的な配置方法の提案萩原照通,会田俊介・風間聡(東北大)土木学会論文集B1(水工学) Vol76,No.2 pp.1189-1194
根固め用袋材への浮遊砂堆積傾向に関する実験的研究萩原照通,会田俊介・風間聡(東北大)土木学会年次学術講演会 (第75回) Ⅱ-07
CFD-DEM連成計算による流れ場における捨石の沈降挙動解析三井 順,田中真史,山崎真史,原 隆混相流シンポジウム2020講演論文集
Evaluation of Hydraulic Performance of Wave Dissipating Block Using Porosity荒木進歩・渡邊大輝(大阪大),久保田真一,橋田雅也ICCE 2020 (国際海岸工学会議 (第37回) )
An Experimental Study on the Stability of Filter Units on Rubble Mound BreakwaterAye Nyein MON・青木伸一(大阪大),小山裕文,木下勝尊,梶原幸治・川村裕紀(キョーワ)ISOPE 2020 (国際海洋極地工学会議(第30回) )
Simulation of the Behaivior of Tetrapods against Solitary Wave Using DualSPHysics三井 順,久保田真一,A.J.C. CRESPO・J. DOMÍNGUEZ・M. GÓMEZ-GESTEIRA(ヴィーゴ大学),C. ALTOMARE(カタルーニャ工科大学),鈴木智弘(フランダース水理研究所)The 5th DualSPHysics Users Workshop


Technical Research Institute
2-7 Higashi Nakanukimachi, Tsuchiura city, Ibaraki prefecture, 300-0006 Japan
  • 10 minutes by taxi from Kandatsu station on JR Joban Line.
  • 20 minutes by taxi from Tsuchiura station on JR Joban Line.