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  6. Seismic reinforcement measures: Maintenance-free and reliable manhole VD method.

Seismic reinforcement measures: Maintenance-free and reliable manhole VD method.

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last updated:Dec 15, 2025

吉光組
吉光組
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By non-excavation, we will achieve seismic reinforcement measures for existing manholes.

The construction method suppresses the uplift of manholes through two functions: ground improvement by vibration and the drainage function for excess pore water pressure relief. Without drawing in groundwater or soil, it is possible to drill from inside the manhole to the bottom of the manhole and install a filter. By vibrating the manhole body and compacting the surrounding ground, ground improvement is achieved, and even if excess pore water pressure occurs due to aftershocks, it is maintenance-free, providing peace of mind. 【Features】 ■ No excavation ■ Maintenance-free ■ Responds to aftershocks *For more details, please refer to the PDF materials or feel free to contact us.

    Civil Engineering Method
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Seismic reinforcement measures: Maintenance-free and reliable manhole VD method.

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  • Related Link - https://www.yoshimitsugumi.co.jp/service/anshin-ma…
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【Construction Procedure】 1. Positioning 2. Inverted drilling (drilling 8 inches) 3. Sleeve pipe fixation 4. Base plate drilling (drilling 5 inches) 5. Filter installation 6. Sleeve pipe removal fixation 7. Guidance pipe installation 8. Vibration work 9. Gap filling work *For more details, please refer to the PDF document or feel free to contact us.

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Safe Manhole VD Method

Safe Manhole VD Method

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The Noto Reconstruction Office of the Ministry of Land, Infrastructure, Transport and Tourism has featured our 3D printer in the Nikkei newspaper.

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The official X account of the Noto Reconstruction Office of the Ministry of Land, Infrastructure, Transport and Tourism and the Nihon Keizai Shimbun have published that our 3D printer has been adopted for the reconstruction of Noto. The official X account of the Noto Reconstruction Office introduces the use of our products in the restoration work of the Noto Expressway. Additionally, the Nihon Keizai Shimbun mentions that structures made with our products are being used for the restoration of roads damaged by the Noto Peninsula earthquake, and that the construction period can be shortened by about two weeks, so please take a look.

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It was broadcast on NHK WORLD.

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The Noto reconstruction project by the Kashima, Yoshimitsu, and Noto region maintenance-type construction joint venture was featured on NHK WORLD, stating that it is being constructed using a 3D printer, and it was broadcast on November 14. It can be viewed in 150 countries around the world.

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We held a site tour.

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At the site of the "R6 Komatsu Yobama Construction," we held a site tour for four days starting from November 24. Visitors were able to observe the automation and remote operation of construction machinery. The event was also featured in the Construction Industry Newspaper and the Construction Communication Newspaper.

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It was awarded as an excellent construction project by Nomi City.

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On November 21, at the Nomi City Hall, our company was awarded for the "Yuno Children's Garden Development Project (Civil Engineering)" as an excellent construction project at the Nomi City Construction Project Awards Ceremony. For more details, please refer to the related link.

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吉光組

吉光組

General contractors and subcontractors

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We have been in the construction business for over 100 years, based in Ishikawa Prefecture.

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