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Joint Meters & Crack Meters

Joint Meters & Crack Meters. CEE 398 Salvador Villalobos Chapa. Outline. Background and principles Placement Applications in civil engineering Advantages and limitations Summary & Conclusions References. Joint meter. The primary element is a spring wire sensing element.

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Joint Meters & Crack Meters

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  1. Joint Meters & Crack Meters CEE 398 Salvador Villalobos Chapa

  2. Outline • Background and principles • Placement • Applications in civil engineering • Advantages and limitations • Summary & Conclusions • References

  3. Joint meter • The primary element is a spring wire sensing element. • This element is anchored at one end and connected to a spring loaded push rod at the other end • Thermal sensor included

  4. Ilustrative explanation • Placed in two parts • Steel protective Frame • Internal protection from possible leakage

  5. Major applications • Mainly used in concrete and masonry structures • Detect movements in joints • Monitor joints that could be affected by external causes

  6. Advantages & limitations • Accuracy and long term stability (+ .2 %) • Suitable fro remote reading and data logging • Water proof and sealed to preassure up to 7 bar • Ranges up to 100 mm

  7. Crack meter • The primary element is a spring wire sensing element. • The sensing element is mounted externally and anchored to the the surface • It can also be used as an external joint meter • 3 types 1, 2 or 3 dimensions

  8. 1 dimension • Anchored at both ends of the crack or joint

  9. 3 dimensions • Set up for 2 or 3 dimensions • Can be used embedded between blocks in a concrete dam

  10. General type • Applications for less precise measurements

  11. Applications • Monitoring of cracks in a damaged structure • Monitoring movement of rocks in tunnel construction • Damage in building affected by nearby construntion

  12. Applications

  13. Advantages & limitations • Accuracy of about .3mm • Equipped with temperature sensor • Reusable • Ranges up from 15, 30 and 60 mm

  14. Summary & conclusions • Some crack meters can be used as joint meters • Precision depends on the required data • Wide ranges of measurement and applications • Great equipment for measuring relative movement

  15. References http://www.soil.co.uk http://www.amplgroup.net http://archrecord.construction.com http://www.geotechnicalinstruments.com http://www.encardio.com http://www.slopeindicator.com

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