About
What is Eco-clean hybrid method?
This is an epoch-making method that enables "shot peening", a technology that improves the fatigue strength of steel products by simply adding 1 step when repainting a steel bridge.The basis of this is the circular blast method, which is a blast method that reduces environmental impact.®"Recycling and Reuse System".
It is also effective for improving fatigue durability of on-site welds in new bridges.
Circulating blast method
Circulating blast method®
Shot peening treatment
Shot peening process
Award history
List of awards
- Japan Society of Civil Engineering Chubu Branch Technical Award (2019)
- Ministry of Education, Culture, Sports, Science and Technology Award (2022)
- Ministry of Land, Infrastructure, Transport and Tourism NETIS Registered CB-180024-A
- Japanese Patent No. 6304901/No. 6501718
Feature
Features
*Excerpt from "Effect of Shot Peening on Fatigue Strength of Welded Joints"
(Japan Society of Civil Engineering, Heisei 28 National Conference Paper Presentation Excellent Speaker Award)
By hitting countless special steel balls (peening materials) on the steel surface at high speed and plastic deformation only near the surface, it is possible to give compressive residual stress to the surface layer.This technology improves resistance to fatigue cracks and stress corrosion cracking.In addition, the crystal on the surface is miniaturized to suppress the growth of cracks.
Furthermore, surface hardening prevents scratches from entering.It is a proven technology that has been commonly used in the automotive and aircraft industries to improve fatigue durability.
Improved durability
Added compressive residual stress
Improved fatigue durability
Miniaturization
Miniaturization of crystals
Reduce crack growth
Curing
Surface hardening
New cracks become harder to enter
Made the impossible possible
"Eco-Clean Hybrid Method"
Flow
Future Repainting standard process
足場・防護設備設置
Protective equipment is installed around the scaffold to prevent the scattering of grinding materials and dust.
(Also used for shot peening)
Base adjustment degree 1 type
For the specified dust work, the person involved in the work performs the construction by the air line equipment.
Inspection of welds, etc.
Check for cracks.Repair of the occurrence was examined and shot peening was carried out in the non-occurrence part.
Peening treatment
Due to the injection by compressed air, work efficiency is good and construction in narrow areas is also possible.Proficiency is also unnecessary.
Form management
We have established a management method using a dedicated mold measuring device (coverage checker) to ensure stable quality.
2 Next blast
Anticorrosive substrate is applied within 4 hours.
Painting
Anticorrosive substrate is applied within 4 hours.
Completed
Undercoating, middlecoating and topcoating.
Shot peening works on existing steel bridges
平成25年度１号潮見東地区橋梁塗装工事
(Chubu Regional Development Bureau Hamamatsu River National Highway Office 2014.3~2015.1)
Heisei 26 fiscal year No. 41 Takayama tube steel bridge repair work
(Chubu Regional Development Bureau Takayama National Highway Office 2015.9~2016.2)t
Heisei 28 fiscal year No. 1 Concentric bridge bridge painting work
(Chubu Regional Development Bureau Hamamatsu River National Highway Office 2016.9~2017.6)
Heisei 28 fiscal year No. 23 Kitagashira Viaduct up painting repair work
(Chubu Regional Development Bureau Nagoya National Highway Office 2017.3~2018.3)
Heisei 30 fiscal year No. 1 Miike Bridge painting work
(Chubu Regional Development Bureau Hamamatsu River National Highway Office 2018.8~2019.6)
東名阪自動車道 津島高架橋塗替え塗装工事（平成30年度）
(Nakanihon Expressway Co., Ltd. Nagoya Branch Office 2019.2~2020.4)
橋梁維持工事（加家高架橋第３径間）
(Tokai City 2019.8~2020.2.）
Tomei Expressway (specific renewal, etc.) Floor plate replacement work between Susono IC and Numazu IC (Heisei 29 fiscal year)
(Nakanihon Expressway Co., Ltd. Tokyo Branch Office 2019.9~2020.12)
No. 23 Moral Viaduct down painting repair work
(Chubu Regional Development Bureau Nagoya National Highway Office 2019.10~2020.11)
Painting repair work in the Mikawa Area in the first year of the Reiwa Era
(Chubu Regional Development Bureau Nagoya National Highway Office 2020.1~2021.3)
橋梁維持工事（加家高架橋第６径間）
(Chubu Regional Development Bureau Shizuoka National Highway Office 2020.5~2021.3)
Painting work in the Fuji Maintenance pipe in the first year of the Reiwa era
(Chubu Regional Development Bureau Shizuoka National Highway Office 2020.5~2021.3)
橋梁維持工事（加家高架橋第６、７径間）
(Tokai City 2020.7~2021.2)
橋梁維持工事（加家高架橋第１径間）
(Tokai City 2020.9~2021.3)
Repainting of bridges under the jurisdiction of the Osaka Expressway Office (Part 2)
(West Japan Expressway Co., Ltd. Kansai Branch Office 2021.7)
Tomei Expressway (Specific renewal, etc.) Floor plate replacement work between Susono IC and Numazu IC (FY2019)
(Nakanihon Expressway Co., Ltd. Tokyo Branch Office 2021.2~ under construction)
Tomei Expressway (specific renewal, etc.) Floor plate replacement work between Susono IC and Numazu IC (FY2020)
(Nakanihon Expressway Co., Ltd. Tokyo Branch Office 2022.1~ under construction)
