High-capacity center-hole load cell for monitoring forces in ground anchors, rock bolts, and tiebacks.
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High-capacity center-hole load cell for monitoring forces in ground anchors, rock bolts, and tiebacks.
The Geolook Vibrating Wire Load Cell is designed to measure tensile or compressive loads in rock bolts, tiebacks, foundation anchors, and tunnel arch supports. It is an essential safety device for verifying that retaining structures are holding the loads they were designed for. The cell features a high-strength alloy steel cylinder with a central hole, allowing it to pass over a tie-rod or tendon. Inside the cell, 3 to 6 vibrating wire strain gauges are equally spaced around the circumference. This multi-sensor configuration allows the instrument to average the readings, effectively canceling out errors caused by eccentric (uneven) loading or bending moments.
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As load is applied to the cell (e.g., by tightening a rock bolt nut), the steel cylinder compresses slightly. This microscopic compression is transferred to the internal vibrating wire elements.
The tension in the wires decreases, changing their resonant frequency. The readout unit measures these frequencies and converts them into load units (kN or Tons). Because the relationship between strain and load is linear for steel, the measurement is highly accurate.
While the G74-V750 is typically an 'Annular' (center-hole) cell for passing rods through, we also offer 'Solid' center cells.
In the real world, load is rarely applied perfectly straight. A slight misalignment of the anchor plate can cause one side of the load cell to compress more than the other.
A single-sensor cell would give a completely wrong reading in this scenario. The G74-V750 uses 3 to 6 sensors spaced around the ring. By averaging their readings, the system mathematically cancels out the bending effects, providing the true total load acting on the anchor.
As load is applied to the cell (e.g., by tightening a rock bolt nut), the steel cylinder compresses slightly. This microscopic compression is transferred to the internal vibrating wire elements.
The tension in the wires decreases, changing their resonant frequency. The readout unit measures these frequencies and converts them into load units (kN or Tons). Because the relationship between strain and load is linear for steel, the measurement is highly accurate.
In the real world, load is rarely applied perfectly straight. A slight misalignment of the anchor plate can cause one side of the load cell to compress more than the other.
A single-sensor cell would give a completely wrong reading in this scenario. The G74-V750 uses 3 to 6 sensors spaced around the ring. By averaging their readings, the system mathematically cancels out the bending effects, providing the true total load acting on the anchor.
While the G74-V750 is typically an 'Annular' (center-hole) cell for passing rods through, we also offer 'Solid' center cells.
We are currently updating the specific model configurations and technical datasheets for this product category.