The Model 4850 NATM Style Shotcrete Stress Cells are designed for the measurement of tangential (4850-1) and radial (4850-2) stresses in shotcrete tunnel linings. The cells consist of two rectangular steel plates welded together around the periphery with a de-aired fluid occupying the space between the plates. A short tube connects the cell to a vibrating wire pressure transducer. A prestressing tube is provided for expanding the cell after the concrete has cured. Cells of this type are also used for measurements of stress in mass concrete.
Specifications
Standard Ranges: 4850-1 | 7.5, 20, 35 MPa
                           4850-2 | 2, 3, 5 MPa
Over Range: 150% F.S.
Resolution: 0.025% F.S.
Accuracy: ±0.1% F.S.
Temperature Range: −20°C to +80°C
L × W × H²: 4850-1 | 200 × 100 × 6 mm
                  4850-2 | 250 × 150 × 6 mm

Geokon, Incorporated, 48 Spencer Street, Lebanon, New Hampshire, 03766 · USA. Tel.: 1(603)448-1562, FAX: 1(603)448-3216, e-mail: info@geokon.com