History
January 1965
Founded
March 1972
Acquisition of construction business license
May 1974
Established Hiraga Civil Engineering Limited Company
August 1987
Organization change to Hiraga Co., Ltd.
October 1992
Increased capital to 30 million yen
October 1998
Increased capital to 40 million yen
March 2003
Acquired ISO9001:2000
(American Institute of Quality Registrars)
November 2003
Acquired ISO9001:2000
(BSI Japan KK, British Standards Institution)
February 2007
Joined the National Microcapsule Industry Association
March 2010
ISO9001: 2008 transition
(BSI Group Japan KK, British Standards Institution)
July 2013
"New Injection Device" is registered as a utility model.
January 2016
With Metro Development Co., Ltd.
M&H construction method jointly developed
(Patent applied, then obtained)
December 2016
with Obayashi Corporation
Joint development of grout filling upward construction method
(4 patent applications)
December 2016
Relocated the head office to Yokohama City, Kanagawa Prefecture
August 2017
Joined the UBE Renewal Industry Association
October 2019
Kanto/Koshinetsu
Joined Nittoku Amenity System Association
May 2021
with Obayashi Corporation
Among the grout filling upward construction methods
2 patents obtained
July 2021
with Obayashi Corporation
Grout filling pressure control valve
1 patent acquired
January 2020
with Obayashi Corporation
Grout filling pressure control valve
1 patent acquired
Awards received
・Kanagawa Kensetsu Station Energetic Up Contest
``Semi-excellent award''
(Kanagawa Prefecture Attractive Construction Business Promotion Council)
・Kanagawa Prefecture Excellent Construction Award
(Kanagawa Prefecture)
・Excellent Construction Award
(Shinso Construction Industry Association)
・Excellent construction agent award
(Shinso Construction Industry Association)
·Letter of thanks
(Sagamihara City Plumbing Equipment Cooperative Association,
Sonan Council,Japan Special Paint Co., Ltd.,
Nishihara Neo Safety Management Office)
・Safety award
(Company) Sagamihara City Construction Industry Association)
・Kanagawa Prefectural Excellent Construction Award
(Kanagawa Prefecture)
・Kanagawa Kensetsu Station Energetic Up Contest
・Safety Up Award
(Kanagawa Prefecture Attractive Construction Business Promotion Council)
・Excellence Award
(Kanagawa branch of the Association for Prevention of Construction Occupational Accidents)
