Over our long history, we have built a solid foundation of technical expertise and trust. On this page, we present TAC’s journey and where we stand today through our corporate history and recognitions.
Organization Chart
Certified as a Health and Productivity Management Outstanding Organization
Received the Minister of Economy, Trade and Industry Award at the 8th Monodzukuri Nippon Grand Award
Selected as a Regional Future Driving Company
Selected as one of the “300 Vibrant SMEs and Micro Enterprises”
Received the “Award for Creative Development Technology” at the 23rd Infrastructure Technology Development Award
Certified as a Health and Productivity Management Outstanding Organization “Bright 500”
Acquired ISO 9001:2015 certification for our quality management system
Received the 2022 Environment Award from the Japan Society of Civil Engineers
Received the Excellent Presenter Award at the 2024 Annual Meeting of the Japan Society of Civil Engineers
Received the Okayama Health Promotion Award 2024
Our shield environmental technology “Automatic Additive System for Slurry Secondary Treatment Agent (KT-180039-A)” was selected as a NETIS recommended technology
Awarded the Small and Medium-sized Enterprise Zero-Accident Record Certificate (Category 2, Progress Award, 1,000 days) by the Japan Industrial Safety and Health Association
Received the Excellence Award in the Regional Category of the Japan Construction Machinery Construction Award from the Japan Construction Machinery and Construction Association
Commended as an Excellent Safety and Health Workplace by the Wake Branch of the Okayama Labour Standards Association
Awarded the Small and Medium-sized Enterprise Zero-Accident Record Certificate (Category 3, Bronze Award, 1,500 days) by the Japan Industrial Safety and Health Association
Certified as a 2025 Health and Productivity Management Outstanding Organization for the eighth consecutive year and selected for “Bright 500” for the fifth consecutive year
TAC Safety Declaration
Partnership Building Declaration
Registered as a “Childcare Support Declaration Company”
“10 Billion Yen Declaration” (sales target declaration)
Miyoshikita Mine opened and began operations, mining and selling ceramic and refractory raw materials
July 5: Takigawa Mining Co., Ltd. established
Started sales of clay sand for the construction industry
Developed the two-component backfill grouting method for shield tunneling
Developed the first-generation simultaneous backfill grouting system
Developed shield segments with baffle plates for sharp curve construction
Developed the "Mini Packer" segment fixing device
Developed and launched sales of TAC-Through, a polymer-based additive
Developed the NEO-TAC method
Developed and launched sales of an automatic mixing plant for backfill grouting
1932–1957 Mining operations
Start of backfill grouting business
Developed "Clay Shock"
Obtained construction business license (civil engineering work)
Company name changed to TAC Corporation
Developed the FLOW-TAC method
Developed and launched the second-generation simultaneous backfill injection pipe
Opened Osaka Sales Headquarters; completed the Equipment Center
Developed and launched TAC Carry, a polymer additive for soil and sand pumping
Developed and launched the third-generation front-mixing simultaneous backfill injection system
Developed and launched the second-generation simultaneous backfill injection
Started sales of backfill and sludge injection equipment for overseas projects
Registered as a construction consulting firm
Developed the sharp-curve excavation method using Clay Shock and Mini Packer
Developed a front-mixing simultaneous injection system (3.5th generation) that can be housed in the shield machine body
Opened Tokyo Branch
Joined a corporate defined-contribution pension plan
Launched bio-related business
Expanded the Equipment Center / Started production and sales of biodiesel fuel
Opened Shanghai Office
Completed our corporate credo ("Our Beliefs")
Established TAC PACIFIC PTE. LTD. in Singapore
Integrated the Equipment Center, Technical Department, and Design Department to establish the "Techno Center"
Introduced productivity management by department
Joined the SME Retirement Allowance Mutual Aid System
Developed and launched the fourth-generation front-mixing simultaneous injection system
Developed Clay Shock Hard
Received the Minister of Economy, Trade and Industry Award at the 8th Monodzukuri Nippon Grand Award
Selected as one of the "300 Vibrant SMEs and Micro Enterprises"
Received the “Award for Creative Development Technology” at the 23rd Infrastructure Technology Development Award
Acquired ISO 9001:2015 certification for our quality management system
Received the FY2022 Environment Award (Group I) from the Japan Society of Civil Engineers
Introduced a mandatory retirement age of 65
Developed carbon-neutral backfill material
Developed "Solid Scale," a uniaxial compressive strength measurement technology for weak materials
Received the Excellence Award in the Regional Category of the Japan Construction Machinery Construction Award
Certified as a Health and Productivity Management Outstanding Organization for eight consecutive years and selected for "Bright 500" for five consecutive years
Received the Minister of Economy, Trade and Industry Award at the 8th Monodzukuri Nippon Grand Award
〒709-0442
390-7 Fukutomi, Wake-cho, Wake-gun, Okayama 709-0442, Japan
TEL +81-869-84-2069
FAX +81-869-84-3288
56 Kaminemoto, Yoshinaga-cho, Bizen-shi, Okayama 709-0212, Japan
TEL +81-869-84-2523
FAX +81-869-84-2578
Cent Urban Building 302, 3-23-15 Nishinakajima, Yodogawa-ku, Osaka-shi, Osaka 532-0011, Japan
TEL +81-6-6304-7910
FAX +81-6-6304-1045
NEOTAC BLDG, 2-26-8 Toyotamakami, Nerima-ku, Tokyo 176-0011, Japan
TEL +81-3-5927-1489
FAX +81-3-5927-1490
Room 534, 5F, Debao International Building, Building 20, No. 3998 Hongxin Road, Minhang District, Shanghai 201103, China
TEL +86-21-6203-6368
FAX +86-21-6203-6368
60 Albert Street, #14-09 OG Albert Complex, Singapore 189969
TEL +65-6835-7208
FAX +65-6884-8720
TEL：+81-869-84-2069
Phone Hours:：Weekdays 9:00–17:00 (JST)
FAX：+81-869-84-3288