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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

*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。

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」

It is possible to prevent the scattering of peening materials by constructing it simultaneously with the repainting work, and using scaffolding for blasting and scattering protection equipment in combination.
循環式ブラスト工法®の「循環再利用システム」を併用することによって、ピーニング材の回収再利用を実現。
The grinding material for painting (steel grit) has been replaced with special steel ball for peening, so that shot peening can be performed even on existing bridges.
We have established on-site construction management methods and finished form management methods to ensure stable quality.

Flow

Future Repainting standard process

(01)

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)

(02)

Base adjustment degree 1 type

For the specified dust work, the person involved in the work performs the construction by the air line equipment.

(03)

Inspection of welds, etc.

Check for cracks.Repair of the occurrence was examined and shot peening was carried out in the non-occurrence part.

(04)

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.

(05)

Form management

We have established a management method using a dedicated mold measuring device (coverage checker) to ensure stable quality.

(06)

2 Next blast

Anticorrosive substrate is applied within 4 hours.

(07)

Painting

Anticorrosive substrate is applied within 4 hours.

(08)

Completed

Undercoating, middlecoating and topcoating.

Shot peening works on existing steel bridges

2024年3月末現在

国土交通省案件:11件

高速道路案件:5件

地方自治体案件:5件