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
サンドコンパクション工法の杭芯材への石炭灰等の有効活用による環境負荷低減広重敬嗣(大成建設),藤井嵩大(JERA),西野日出樹・川崎雄大(大成建設),尾形太地盤工学会誌2021年4月号 Journal of JGS Vol.69 Nno.4 Ser.No.759 pp17-20
第31不動号(サンドコンパクション船)古庄哲士作業船 台343号 pp.24-27
SCP(サンドコンパクションパイル)工法による改良効果に関する研究の変遷と知見原田健二基礎工 2021年5月号 (第49巻 第5号 通巻574号) pp.48-51
CI-CMC-HA工法 (QS-160049-VE) と CI-CMC-HG工法 (QS-200009-A) ~硬質地盤に適応した大径・低変位の深層混合処理工法~梅田洋彰月刊「建設機械」2021年6月号 pp.1-5
Centrifuge study on the effect of the SCP improvement geometry on the mitigation of liquefaction-induced embankment settlement(SCP工法による幾何学的改良範囲の液状化に起因する盛土沈下対策に関する遠心模型実験)李楊・北詰昌樹・高橋章浩(東工大),原田健二,大林淳Soil Dynamics and Earthquake Engineering Volume 148, September 2021, 106852
海底鉱物資源の揚鉱に用いるキャリア物質のレオロジー特性の計測(その1)古庄哲士,折田清隆・谷和夫(東京海洋大),鈴木亮彦第56回地盤工学研究発表会 12-1-2-01
コーン貫入試験による打設直後の高圧噴射撹拌工法の改良体の強度調査武田尚也,原田健二,伊藤竹史第56回地盤工学研究発表会 12-1-3-06
河川堤防における砂圧入式静的締固め工法の変位対策事例梅田洋彰,森哲夫(新井組),古庄哲士,木下洋樹,永石雅大,中井啓二第56回地盤工学研究発表会 12-1-4-03
細粒分混り砂の異方応力状態による液状化強度特性と損失エネルギー町田亘・石川敬祐(東電大),原田健二,安田進(東電大),出野智之第56回地盤工学研究発表会 12-4-4-03
SCP打設角度が異なる液状化地盤の挙動に関するFEM解析藤本翔太・北詰正樹・高橋章浩(東工大),大林淳,原田健二第56回地盤工学研究発表会 12-9-4-04
三隅発電所2 号機建設工事におけるライトサンド(クリンカアッシュ)を用いたSCP 工法の適用について高橋達郎(三井住友建設),田中隼矢,木下洋樹,安達光徳・秋山裕樹(中国電力)第56回地盤工学研究発表会 12-9-4-05
締固め砂杭打設過程を考慮した水平地盤模型の加振実験(その1)矢部浩史,原田健二,梅田洋彰,古関潤一・木村裕斗(東大)第56回地盤工学研究発表会 12-9-5-01
締固め砂杭打設過程を考慮した水平地盤模型の加振実験(その2)木村祐斗,古関潤一(東大),原田健二,矢部浩史,梅田洋彰第56回地盤工学研究発表会 12-9-5-02
砂圧入式静的締固め工法による河川堤防基礎耐震化の事例竹内秀克,尾形太,梅田洋彰土木施工 令和3年8月号 pp.85-88
時代のニーズに応じて進化するSCP工法原田健二土木学会誌 Vol.106 No.9 September 2021 pp.40-42
締固め砂杭工法を模擬した模型地盤における加振前後のサウンディング試験矢部浩史,古関潤一(東大),中澤博志(静岡理工科大)土木学会年次学術講演会 (第76回) III-84
コーン貫入試験及び画像判断を用いた高圧噴射撹拌工法の出来形調査武田尚也,原田健二,山下祐司,伊藤竹史土木学会年次学術講演会 (第76回) III-93
簡易な液状化判定による東日本大震災でのSCP工法の改良効果の検証石川敬祐・安田進(東電大),原田健二,出野智之,町田亘(東電大)土木学会年次学術講演会 (第76回) III-215
排土式変位低減型深層混合処理工法 2軸大径実証実験の報告(その4) 現場発現強度の結果及び考察寺本崇宏(清水建設),山下勝司,河合拓也(テノックス),大古利勝己(あおみ建設)土木学会年次学術講演会 (第76回) VI-118
ニューマチックケーソン支持力対策としての静的締固め砂杭工法の適用事例(その1)~軟弱地盤の施工に伴う変位対策~川村理史・後藤修二(大成・岩田地崎・関電工JV),大塚文昭・吉田哲也(東京水道局),竹内秀克,菅章悟土木学会年次学術講演会 (第76回) VI-119
ニューマチックケーソン支持力対策としての静的締固め砂杭工法の適用事例(その2)~地盤改良用鉄鋼スラグ混入地盤掘削土のハンドリング性の検証~川村理史・後藤修二(大成・岩田地崎・関電工JV),大塚文昭・吉田哲也(東京水道局),竹内秀克,菅章悟土木学会年次学術講演会 (第76回) VI-120
大型地盤改良機で初めてとなる自動打設システム「GeoPilot®-AutoPile」鈴木亮彦,伊藤竹史,竹内秀克,中谷真弥セメント・コンクリート No.898, Dec. 2021 pp.26-30
最新の地盤改良技術と動向中出雄也,尾形太地盤工学会北海道支部 技術報告集第62号 pp.330-335
細粒分を含む砂の貫入抵抗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),矢部浩史材料 2022年 71巻 1号 p. 73-78
締固めによる液状化対策工法の変遷とその事例村上太基,梅田洋彰,竹内秀克月刊「建設機械」2022年3月号 pp.30-35
複流線固化材スラリー噴射撹拌工法の概要と施工例 -FTJ工法・FTJ-FAN工法-竹内秀克,田口雄一基礎工 2022年3月号 (第50巻 第3号 通巻584号) pp.66-68
点群データを活用した構造物の施工管理に対する試行小林 純,植村飛鳥土木学会年次学術講演会 (第76回) Ⅵ-712
Ⅱ期線工事での超硬質な硬岩掘削の工夫佐藤直輝・袴田武大(東日本高速道路),後藤重信,平久保良二,塩川元章土木施工 2021年10月号 pp.60-65
鳥の海PAランプ切替を含む軟弱地盤区間での土工事清水尚志・成岡尚哉・阿南洵哉(東日本高速道路),堀井信雄,塩川元章,最上明好(アイサワ工業)土木施工 2021年10月号 pp.153-158
Enhanced reactivity of dicalcium phosphate dihydrate with fluoride ions by coating with apatite nanoparticlesN. Okajima・ M. Tafu・ T. Toshima(富山高専) M. Takada, Y. Hagino, J. Asian Ceram. Soc., 9(2), 498-506 (2021)
消波ブロック傾斜堤の性能評価におけるDupuit-Forchheimer則の適用菊崎郁人・荒木進歩(大阪大),久保田真一,三井 順,渡部未樹久土木学会論文集B2 (海岸工学) Vol.77,No.2 pp.739-744
SPH法による津波越流時の防波堤背後の流動場とブロック挙動の数値解析三井 順,久保田真一,松本 朗土木学会論文集B2 (海岸工学) Vol.77,No.2 pp.757-762
遊水部を有する長周期波対策マウンドの消波特性に関する研究三井 順,渡部未樹久,久保田真一,松本 朗土木学会論文集B3 (海洋開発) Vol.77,No.2 pp.43-48
Numerical investigation on effectiveness of portable rubble mound breakwater for mangrove restorationS. Sreeranga・高木泰士・白井陸大(東工大),久保田真一,三井 順土木学会論文集B3 (海洋開発) Vol.77,No.2 pp.61-66
低天端海洋構造物における消波工の断面形状の変化が波力低減効果に与える影響澁谷容子・山本郁佳(東洋建設),荒木進歩(大阪大),久保田真一,小竹康夫(東洋建設)土木学会論文集B3 (海洋開発) Vol.77,No.2 pp.253-258
サンゴ礁域における木材増殖礁の水産増殖効果柴田早苗,幸田隆史・高山博史(神鋼建材工業),仲本豊(仲本工業),伊藤靖(漁村総研),末永慶寛(香川大)土木学会論文集B3 (海洋開発) Vol.77,No.2 pp.571-576
浮遊砂が袋型根固め材周辺の河床洗堀に及ぼす影響について萩原照通,会田俊介・風間聡(東北大)土木学会年次学術講演会 (第76回) Ⅱ-32
越波実験による消波ブロックのroughness factorの算定及び波の遡上状況渡部未樹久,久保田真一,三井 順,荒木進歩・菊崎郁人・渡邊真子(大阪大),渡邊大輝(大林組)土木学会年次学術講演会 (第76回) Ⅱ-88
物理エンジンを用いた消波ブロックの抵抗力評価手法の検討三井 順,久保田真一,松本 朗土木学会年次学術講演会 (第76回) Ⅱ-89
3次元データを活用した消波ブロックの数量算出法に関する基礎的検討橋田雅也,昇 悟志,松本 朗土木学会年次学術講演会 (第76回) Ⅵ-279
消波ブロック傾斜堤の性能評価手法の高精度化への試み菊崎郁人・荒木進歩(大阪大),久保田真一,三井 順,渡部未樹久混相流シンポジウム2021講演論文集
Blind-test numerical simulation of tsunami wave pressure acting on a land structure三井 順,川崎浩司(ハイドロ総合技術研究所),久保田博貴(パシフィックコンサルタンツ),鈴木高二朗(港湾空港技術研究所)Journal of Disaster Research Vol.16, No.7, pp.1005-1014
Applicability of the numerical simulation of the impulsive wave pressure of solitary waves有川太郎(中央大),高橋研也(五洋建設),鈴木高二朗(港湾空港技術研究所),木原直人(電力中央研究所),岡本大史(中央大),三井 順Journal of Disaster Research Vol.16, No.8, pp.1286-1297
SPH simulation of hydrodynamic behaivior of Tetrapods against solitary wave三井 順,C. ALTOMARE(カタルーニャ工科大学),A.J.C. CRESPO・J.M. DOMÍNGUEZ(ヴィーゴ大学),鈴木智弘(フランダース水理研究所),久保田真一,M. GÓMEZ-GESTEIRA(ヴィーゴ大学)The 15th SPHERIC International Workshop, pp.38-44


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.