Description
Model: ESC-30V
The ESC-30V stress cell is designed for measuring radial and tangential stresses within the shotcrete linings of tunnels, particularly where the New Austrian Tunnelling Method (NATM) or other underground construction techniques are applied.
This instrument plays a key role in evaluating the stress distribution inside the shotcrete layer.
The cell features a rectangular stainless-steel pressure pad made of two welded plates sealed along the edges. The pad is connected to a vibrating wire pressure transducer, joined through a 6 mm × 165 mm stainless-steel tube. Both the pressure pad and sensor cavity are filled with de-aired hydraulic fluid to ensure accurate stress transmission.
After the surrounding concrete has cured, a pinch tube (ESC-30V) or re-groutable version (ESC-30V-R) allows the pad to be re-inflated, ensuring firm contact between the cell and the concrete surface.
Specifications
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Instrument type: Shotcrete-Concrete Stress Cell
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Sensor: Vibrating wire
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Installation: Embedded at rock–concrete interface; includes pinch tube
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Application: Monitoring radial and tangential stresses in tunnel linings, underground caverns, rafts, etc.
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Measured parameter: Stress / pressure
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Available ranges: 1.0 – 30.0 MPa (specify)
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Testing / calibration: Accuracy and leak-proof tests
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Features: Hermetically sealed by electron-beam welding
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Protection: IP-68, waterproof for full measurement range
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Dimensions (L × B): 100 × 200 mm; 150 × 250 mm; 200 × 300 mm; 300 × 300 mm
