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- IGI - Shotcrete Stress Cells
IGI - Shotcrete Stress Cells
Shotcrete stress cells are designed to measure radial and tangential stresses in shotcrete linings in tunnels. This instrument provides the most significant data for determining thickness and stability of shotcrete lining in NATM (New Austrian Tunneling method). These cells consist of two rectangular stainless steel plates, welded together around their periphery and spaced apart by a narrow cavity filled with de-aired fluid and connected by a stainless steel tubing to a pressure transducer. The cell has an inflation valve to restore contact between concrete and cell after the concrete has set. Provision of gas discharge tube protects the sensor against surge and lightning.
The Shotcrete cells used in radial application have inflation valve perpendicular to the flat surface while the shotcrete cells used in tangential application have the inflation valve parallel to the flat surface. A specialised tool is provided to operate the inflation valve.
Low Capacity Shotcrete Without Notch
Very thin (4mm) shotcrete cells are availble in low range for special applications.
- Standard Ranges : 5, 10,20,35,50 100, 150, 200, 350 kg/cm²
- Over Range : 150%
- Accuracy %fs : 1%fs
- Material : Stainless steel
- Operating Temperature : -10 to 70°C
- Coil Resistance : 140 – 160 Ohm @ 25°C
- Thermistor : 3k Ohm @ 25°C
- Surge arrestor : For protection against lightening (optional)
- Dimension : 100 x 200 mm, 300x300mm
- Pressure transducer : 22 mm diameter
- Cable : 1m , 4 core shielded.