About
循環式ショットピーニング工法とは
鋼橋の塗替え塗装時に1工程加えるだけで鋼材の疲労強度を向上させる技術「ショットピーニング」を可能とした画期的な工法。その基になっているのが環境負荷低減型のブラスト工法である循環式ブラスト工法®の 「循環再利用システム」。
新設橋梁における現場溶接部の疲労耐久性向上にも有効です。
Circulating blast method
循環式ブラスト工法®
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
- JIS G 0951 (Shot for circular shot peening)
- 米国特許 US 11959148 B2
Feature
Features
![](https://eco-yamadapeint.co.jp/wp/wp-content/themes/yit_corporate/assets/img/s_hybrid/s_hybrid_feature_img@1.webp)
![](https://eco-yamadapeint.co.jp/wp/wp-content/themes/yit_corporate/assets/img/s_hybrid/s_hibrid_feature_img_02@1.webp)
*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)
無数の特殊鋼球(ピーニング材)を高速度で鋼材表面に打ち当て、表面近傍だけを塑性変形させることで、表面層に圧縮残留応力を与え、疲労き裂と応力腐食割れなどに対する抵抗力の向上を図る技術です。また表面の結晶が微細化され、き裂の進展を抑制します。
さらに表面硬化することでキズも入りにくくなります。自動車や航空機業界では疲労耐久性向上として一般的に用いられてきた実績のある技術です。
![](https://eco-yamadapeint.co.jp/wp/wp-content/themes/yit_corporate/assets/img/s_hybrid/s_hybrid_feature_bg@1.webp)
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
不可能を可能とした
「循環式ショットピーニング工法」
Flow
Future Repainting standard process
![](https://eco-yamadapeint.co.jp/wp/wp-content/themes/yit_corporate/assets/img/s_hybrid/s_hybrid_flow_01@1.webp)
足場・防護設備設置
足場周りに、研削材や粉じんの飛散防止のために防護設備を設置。
(ショットピーニングの際も使用)
![](https://eco-yamadapeint.co.jp/wp/wp-content/themes/yit_corporate/assets/img/s_hybrid/s_hybrid_flow_02@1.webp)
Base adjustment degree 1 type
For the specified dust work, the person involved in the work performs the construction by the air line equipment.
![](https://eco-yamadapeint.co.jp/wp/wp-content/themes/yit_corporate/assets/img/s_hybrid/s_hybrid_flow_03@1.webp)
Inspection of welds, etc.
Check for cracks.Repair of the occurrence was examined and shot peening was carried out in the non-occurrence part.
![](https://eco-yamadapeint.co.jp/wp/wp-content/themes/yit_corporate/assets/img/s_hybrid/s_hybrid_flow_04@1.webp)
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.
![](https://eco-yamadapeint.co.jp/wp/wp-content/themes/yit_corporate/assets/img/s_hybrid/s_hybrid_flow_05@1.webp)
Form management
We have established a management method using a dedicated mold measuring device (coverage checker) to ensure stable quality.
![](https://eco-yamadapeint.co.jp/wp/wp-content/themes/yit_corporate/assets/img/s_hybrid/s_hybrid_flow_06@1.webp)
2 Next blast
Anticorrosive substrate is applied within 4 hours.
![](https://eco-yamadapeint.co.jp/wp/wp-content/themes/yit_corporate/assets/img/s_hybrid/s_hybrid_flow_02@1.webp)
Painting
Anticorrosive substrate is applied within 4 hours.
![](https://eco-yamadapeint.co.jp/wp/wp-content/themes/yit_corporate/assets/img/s_hybrid/s_hybrid_flow_08@1.webp)
Completed
Undercoating, middlecoating and topcoating.
Shot peening works on existing steel bridges
2024年3月末現在