Company Profile
Name in Full :Nikken Kogaku Co., Ltd.

HeadOffice:Establishment :Capital :President :Employees
Clients

March 1964
Telephone:
9,854,500USD
Telefax:
Yoji MINAKAWA
E-mail:114
Website:・Ministry of Land, Infrastructure, Transport and Tourism
・Local governments across Japan
・Construction companies across Japan and South Korea
・Construction consultants across Japan

17F Nittochinishishinjuku Building 6-10-1 Nishishinjuku, Shinjuku-ku, Tokyo,
160-0023,Japan(81-3)3344-6811(81-3)5381-7377
Int-mail@nikken-kogaku.co.jp
https://www.nikken-kogaku.co.jp/English/Providing Services
Since 1964,1964, we
we havehave been
been working
working onon thethe development
development andand dissemination
dissemination ofof new
new technologies
technologies andand new
new construction
construction methods
methods aiming
aiming at
at
Since
disasterprevention
ofthenational
landagainstvariousnaturaldisasterssuchashighwave,tsunami,typhoon,flood,erosion,etc.
anddisaster prevention of the national land against various natural disasters such as high wave, tsunami, typhoon, flood, erosion, etc. andconservation ofof thethe richrich naturalnatural environment.
environment. ThroughThrough cooperationcooperation withwith universities,universities, researchresearch institutions
institutions andand different industries, weconservationdifferent
industries,
wedevelopandpropose
manufacturingmethods
fora
wide
rangeofproducts
suchasdevelop and propose manufacturing methods for a wide range of products such as wave-dissipating block, revetment block, natural stone
wave-dissipating
block, revetment block, natural stone block and Geosynthetics.
blockand Geosynthetics.

In March
March 2019,2019, Nikken
Nikken Kogaku
Kogaku receivedreceived “JAPAN“JAPAN Construction
Construction InternationalAward”
InternationalAward” from the Minister of Land,
In
from the Ministerof Land,andInfrastructure,
Transport andin recognition
its and contribution.
Infrastructure,
Transport
Tourism in recognitionof itsTourism
international
businessof
efforts
international business efforts and contribution.
Main Products
RAKUNA-IV

GRASP

STONE-BLOCK

A radiation-type wave dissipating block with
4 hollows on the surface. Interlocking of legs
and hollows prevents damage from spreading
and improves stability against wave force andwave dissipating effect.

SEALOCK-VIII

Realizing outstanding stability against severe
waves by strong interlocking of blocks. Highstability number has been confirmed by thehydraulicmodelexperimentsjointlyconductedwith Kyoto University.

An economical block developed to be
widely used for gentle slope revetment
works, breakwater armor units, footprotection works and etc. to protect coasts
and rivers from wave, flow and erosion.

Realizing high stability against waves andflow by strongly interlocked 4 legs. For
placeswithhighwaves,itisan economical
wave-dissipating block that does not use
reinforcing steels inside.

Project Achievement／Technical Expertise
Nghi Son Refinery and Petrochemical (NSRP) Complex is the second
oil refinery in Vietnam. RAKUNA-IV is being used for the rubblemound breakwater protection in the NSRP Project. The breakwater withthe totallength of 1.55km is completed in Dec. 2015.Approximately 700
pcs of 12t block for roundhead and 23,000 pcs of 8t block for the trunk
section and the revetment were installed in the whole breakwater. When
comparing RAKUNA-IV and conventional TETRAPOD, RAKUNAIV was expected to reduce 12,000 m3 concrete volume, and shorten theconstruction period by up to 200 days.
The quality and technology of RAKUNA-IV were highly evaluated in
the NSRP Project, which led to the adoption for breakwaters of ongoingprojects at Chan May Port in Vietnam and Patimban Port in Indonesia.
Contact Personnel
NaozumiYoshizuka

MailAddress:
yoshizuka@nikken-kogaku.co.jp

RAKUNA-IV