Announced details
Domestic mountain tunnel construction and shotcrete work
Equivalent compressive strength at 24 hours of age: 7.0–11.8 N/mm²; rebound rate: 17.7–21.5% with the liquid accelerator versus 34.3% with the powder accelerator; rebound rate reduced by approximately 37–48%; underground dust concentration: 1.8–2.1 mg/m³ with the liquid accelerator versus 3.8 mg/m³ with the powder accelerator
A field demonstration was conducted by 大本組, シーカ・ジャパン株式会社 and ニシオティーアンドエム株式会社. The Chugoku Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism, was the project owner. Capital and personnel relationships: Not disclosed.
The Chugoku Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism, was the project owner. シーカ・ジャパン株式会社 is headquartered in Minato-ku, Tokyo, and its president is Aman Marco (アマン・マルコ). ニシオティーアンドエム株式会社 is headquartered in Takatsuki, Osaka, and its president is Kita Shunsuke (北俊介).
Site of the FY2024 Akitsu Bypass Mitsu No. 1 Tunnel Construction Project (location: Not disclosed)
In this announcement the company addresses none of Contract Value / Offering price / Impact on Business Performance.
| Item | Details |
|---|---|
| Names of Products / Services Covered | Shotcrete technology using a liquid accelerator, Equipment compatible with shotcrete using both liquid and powder accelerators, Smart Batcher Plant (concrete batching plant) |
| Counterparty | Chugoku Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism, シーカ・ジャパン株式会社, ニシオティーアンドエム株式会社 |
| Counterparty overview | The Chugoku Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism, was the project owner. シーカ・ジャパン株式会社 is headquartered in Minato-ku, Tokyo, and its president is Aman Marco (アマン・マルコ). ニシオティーアンドエム株式会社 is headquartered in Takatsuki, Osaka, and its president is Kita Shunsuke (北俊介). |
| Relationship with the Company | A field demonstration was conducted by 大本組, シーカ・ジャパン株式会社 and ニシオティーアンドエム株式会社. The Chugoku Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism, was the project owner. Capital and personnel relationships: Not disclosed. |
| Applicable area | Domestic mountain tunnel construction and shotcrete work |
| Location | Site of the FY2024 Akitsu Bypass Mitsu No. 1 Tunnel Construction Project (location: Not disclosed) |
| Quantitative Effects | Equivalent compressive strength at 24 hours of age: 7.0–11.8 N/mm²; rebound rate: 17.7–21.5% with the liquid accelerator versus 34.3% with the powder accelerator; rebound rate reduced by approximately 37–48%; underground dust concentration: 1.8–2.1 mg/m³ with the liquid accelerator versus 3.8 mg/m³ with the powder accelerator |
Items this document does not state (11)
These are items the company does not state in this document. We do not leave them blank, nor fill them in from other sources or by inference.
The reasons the company gives
The company's own explanation, not something inferred from the numbers.In response to the growing emphasis on measures to control dust, the company advanced performance verification of the liquid accelerator and the development of equipment capable of flexibly adapting to site conditions, with the aim of reducing the burden on workers and ensuring safety.