| 1943 |
Tadao Kamijyo started “KAMIJO BOSAI KOGYOSHO”, a tunnel waterproofing business, in Akita Pref. |
| 1947 |
Raito Bousui Eki, proprietary quick set mortar sealing liquid, was developed. |
| 1948 |
RAITO BOSUI KOGYOSHO CO., LTD., named after the sealing liquid, was founded in Sendai, Miyagi Pref. |
| The first original shotcrete machine was developed. |
| 1950 |
The first slope protection work was completed using Raito shotcrete machine. |
| 1951 |
The company name was changed to “RAITO KOGYO CO., LTD.” and the head office was moved to Kudan, Tokyo. |
| 1954 |
The first grouting work was carried out to improve bridge pier foundation. |
| 1958 |
The first overseas waterproofing work was carried out in Taiwan. |
| 1959 |
“Rapid greening” hydroseeding method was tested on site. |
| 1961 |
Listed in the second section of Tokyo Stock Exchange. |
| 1963 |
Raito’s proprietary “RG pile method” was adopted in the Subway Ginza Line Project. |
| 1971 |
Chemical grouting method was introduced from Soletanche Entereprise, France. |
| 1973 |
Technical Research Laboratory was established in Narashino, Chiba Pref. |
| 1974 |
Listed in the first section of Tokyo Stock Exchange. |
| 1975 |
“Prestressed Anchor method” was introduced from Soletanche Enterprise. |
| 1980 |
“Quatre Vingt” hydromulching method, effective for rock slope greening, was
developed. |
| 1981 |
“PLUSS” pipe laying method was introduced from Soletanche Enterprise. |
| 1982 |
“RSW Column” 4 shaft soil-cement column method was developed. |
| 1984 |
“Silacsol” high-durablility grout was introduced from Soletanche Entereprise. |
| 1988 |
“Enpasol” ground investigation system was introduced form Soletanche Entereprise. |
| 1989 |
“Strip-reinforcing Earth Method” was developed. |
| 1992 |
“UNILAP”, high head pumping delivery system for shotcreting, was developed. |
| 1993 |
“RAS Column”, a proprietary deep soil mixing method, was developed. |
| 1995 |
“Ecocycle Greening”, a slope greening method using recycled materials, was developed. |
| 1996 |
“Rock Bonding Method”, a method to prevent fragile rocks from falling, was
developed. |
| 1997 |
“RAITO, INC.”, a U.S. based ground improvement contractor, was founded as
100% subsidiary. |
| 1998 |
“Maxperm Grouting Method”, a grouting method especially effective to prevent
liquefaction was developed. |
| ISO9001 was certified to Tokyo Branch, followed by all the other branches. |
| “Roving Wall” continuous-fiber reinforced soil method was developed. |
| 1999 |
Technical Research Laboratory was certified as a public laboratory for environmental quantitative analysis. |
| Environmental investigation and remediation business was launched. |
| 2001 |
“All Greening”, an environmental-friendly thick plant-base spray installation method
for slope greening, was developed. |
| 2002 |
The head office received ISO14001 certification. |
| 2003 |
“EcoClay Wall” , environmental-friendly underground cutoff wall installation method, was developed. |
| “Conduction Navi”, three-dimensional navigational drilling system, was developed |
| 2004 |
Continuous Rock Sounding System was developed based on ENPASOL sounding system. |
| “ELPS” drilling method for super-long tunnel forepiling system was developed. |
| Non-destructive old building diagnosis system was developed |
| 2005 |
Computerized QA/QC system for soil mixing wall methods was developed. |
| “Alfasol-G Injection” method for repairing concrete structures was introduced. |
| Yasasiite Raito Co., Ltd. was established to start elderly care business. |
| 2006 |
“Slope Coloring Shotcrete” method was developed. |
| “3D Protection Panel” method was introduced. |
| 2007 |
“SSI” method and “N-SSI” method was introduced from JR Soken Engineering Co., Ltd. |
| “RMP-J”, a very large diameter ground improvement method, was developed. |
| Compound dynamic injection method was developed. |
| “Hat Ring”, a method to prevent manhole from floating during earthquake, was introduced from CS Engineers Co., Ltd. |
| 2008 |
“OPT Jet Grouting” method was developed. |
| Deviation control and correction system “A-VEX” for “RSW” soil mixing wall was developed. |
| “ACTM” method was developed. |
| “ES Net” method was developed. |
| Percussion driving system for “Conduction Navi” drilling was developed. |
| 2009 |
New jet grouting methods, “JEP-L” and “JEP-M”, were developed. |
| “RCG”, a method to fill voids behind tunnel lining, was developed. |
2010 |
“RMP-MST”, a 2-shaft mechanical mixing type large ground improvement method was developed. |
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