Radial and tangential stress cell designed for monitoring stress in shotcrete tunnel linings.
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Radial and tangential stress cell designed for monitoring stress in shotcrete tunnel linings.
The Geolook Vibrating Wire Shotcrete Stress Cell is specifically engineered to measure the development of radial and tangential stresses within shotcrete (sprayed concrete) linings in tunnels and underground excavations. Unlike standard pressure cells, this unit features a specialized 'pinch tube' for repressurization. As shotcrete cures, it shrinks, potentially pulling away from the sensor face and causing data loss. The pinch tube allows the operator to re-inflate the cell after curing, ensuring perfect contact with the surrounding concrete for accurate stress transfer.
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A complete monitoring station typically uses both types:
In modern tunneling (NATM/SEM), the shotcrete lining is a structural element, not just a covering. Knowing the exact stress levels allows engineers to optimize the lining thickness—saving millions in concrete costs—while guaranteeing safety by detecting overload conditions before visible cracking occurs.
As shotcrete hydrates, it shrinks. This creates a tiny gap between the concrete and the sensor, causing the pressure reading to drop to zero even if the tunnel is under load.
The G73-V660 solves this with a built-in repressurization tube. After the concrete sets (typically 24-48 hours), a crimping tool is used to squeeze this tube, forcing hydraulic fluid into the cell pad. This expands the cell slightly to bridge the gap and restore active pressure monitoring.
A complete monitoring station typically uses both types:
As shotcrete hydrates, it shrinks. This creates a tiny gap between the concrete and the sensor, causing the pressure reading to drop to zero even if the tunnel is under load.
The G73-V660 solves this with a built-in repressurization tube. After the concrete sets (typically 24-48 hours), a crimping tool is used to squeeze this tube, forcing hydraulic fluid into the cell pad. This expands the cell slightly to bridge the gap and restore active pressure monitoring.
In modern tunneling (NATM/SEM), the shotcrete lining is a structural element, not just a covering. Knowing the exact stress levels allows engineers to optimize the lining thickness—saving millions in concrete costs—while guaranteeing safety by detecting overload conditions before visible cracking occurs.
We are currently updating the specific model configurations and technical datasheets for this product category.