A method and device for monitoring the prestress relaxation of an anchor rod based on piezoelectric impedance sensing
By embedding a piezoresistive impedance sensor in the anchor bolt gasket, the impedance signal is obtained and the equivalent contact stiffness is calculated, which solves the problems of accuracy and reliability of anchor bolt prestress monitoring in the prior art, and realizes non-destructive, online prestress monitoring and early warning.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-14
- Publication Date
- 2026-07-17
AI Technical Summary
Existing anchor bolt prestress monitoring technologies struggle to achieve large-scale, low-cost, accurate, and reliable dynamic relaxation process tracking. Direct measurement methods suffer from large sensor sizes and interference with structural stress, while indirect inference methods lack sufficient accuracy and anti-interference capabilities.
Piezoresistive impedance sensors are embedded in the anchor bolt pads. By acquiring impedance signals, the equivalent contact stiffness of the interface between the anchor bolt and the surrounding rock is determined. An equivalent relationship is established to calculate prestress, thereby achieving non-destructive online monitoring.
It enables non-destructive, online monitoring of anchor bolt prestress. The sensors are protected, accurately capturing minute changes in prestress and providing early warnings, thus avoiding damage to external sensors in harsh environments and interference with structural forces.
Smart Images
Figure CN122409014A_ABST