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Multi-point Extensometer

SGJ-IV rod extensometer, used for measuring the displacement of points around the tunnel or inside the surrounding rock, is the fourth generation product of SGJ series full-length bonded rod extensometer (its first generation product was developed in 1980), of which the components connected with the threads are easy for assembling at site, and the readout instrument with digital centigrade indicator can well meet the requirements of field measurement with good adaptability.

SGJ-V wire-type extensometer is the fifth generation product of SGJ series full-length bonded displacement meter. Compared with the rod extensometer, no field assembly is needed for SGJ-V wire-type extensometer, which is especially suitable for deep-hole displacement measurement in tunnel. And now, the deepest measurement depth for horizontal ground displacement in tunnel is of 15m in the Wushaoling tunnel project.

And its main technical parameters are as follows:

1. Number of measuring point: single point or multipoints;

2. Length: 3m or more;

3. Embedding manner: drilling hole and full-length anchoring with mortar;

4. Maximum measurement range: ± 100mm

 

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