Geological survey of small cross-section tunnels
Quantitative surveys of ground loosening and cavities around small cross-section tunnels have become possible.
**Necessity and Background** - In waterway tunnels that have been constructed for some time, cavities may form behind the lining due to water leakage. These cavities can cause loosening in the consolidated ground, change the earth pressure acting on the lining, and potentially lead to the destruction of the lining. - Therefore, it is necessary to quantitatively investigate the cavities behind the lining in tunnels that have been in existence for a long time. **Product Overview** - Investigations can be conducted from inside small cross-section tunnels. - The penetration rate, thrust, and rod rotation speed of rotary percussion drills and rotary boring machines within the tunnel are measured and recorded, allowing for a quantitative investigation of previously unknown small cavities and the loosening condition of the ground. *Please refer to the leaflet for more information.* **Features** - Collection of detailed N-value data of the ground - N-values can be obtained every 1 cm (compared to 1 m in general geological surveys). - Quick investigation - No need for temporary facilities and no use of core tubes, allowing for a rapid survey. - All-direction investigation - Drilling can be conducted in all directions from inside the tunnel. - Investigation in small-diameter tunnels - Investigations can be conducted in tunnels with a diameter of 2 meters or more. - Investigations from the ground surface are also possible. - Target geology - All types of geology. *For more details, please refer to the technical documentation or contact us.*
- Company：東設土木コンサルタント
- Price：Other
