CN-122015627-A - Real-time strain monitoring device for reinforced concrete beam reinforced by carbon fiber grid

CN122015627ACN 122015627 ACN122015627 ACN 122015627ACN-122015627-A

Abstract

The invention provides a real-time strain monitoring device for a carbon fiber grid reinforced concrete beam, and relates to the technical field of constructional engineering. The real-time strain monitoring device for the reinforced concrete beam reinforced by the carbon fiber grid comprises a signal processing mechanism, a built-in signal processing system and a monitoring mechanism, wherein the monitoring mechanism comprises a miniature substrate, a resistance strain gauge is stuck to the upper end of the miniature substrate, a sealing protection layer is fixedly arranged at the upper ends of the miniature substrate and the resistance strain gauge, two ends of the resistance strain gauge are respectively connected with a shielding wire, the other end of the shielding wire is connected with a signal wire, two sliding grooves are formed in two sides of the lower end of the miniature substrate, and sliding frames are slidably arranged in the four sliding grooves. The device can adapt to carbon fiber grids with different sizes, monitors data accurately, can reduce electromagnetic interference, realizes real-time transmission of strain data, is convenient to install and does not influence reinforcing effect, and provides reliable support for structural safety.

Inventors

NIU PENG
LI RONGGUO
CHEN PEIJUN
HE LIXIA
ZHANG JINHAO
JIN CHUNFU
SHI FENG
REN PENG
JIA FUKANG
ZHAO SIDI

Assignees

沈阳大学

Dates

Publication Date: 20260512
Application Date: 20251226

Claims (7)

1. A real-time strain monitoring device for carbon fiber grid consolidates reinforced concrete roof beam, its characterized in that includes: A signal processing means (3) in which a signal processing system is incorporated; the monitoring mechanism (1), the monitoring mechanism (1) comprises a miniature substrate (103), a resistance strain gauge (102) is stuck to the upper end of the miniature substrate (103), a sealing protection layer (101) is fixedly arranged at the upper ends of the miniature substrate (103) and the resistance strain gauge (102), shielding wires (105) are respectively connected to two ends of the resistance strain gauge (102), and a signal wire (2) is connected to the other end of the shielding wire (105); Two sliding grooves (112) are formed in two sides of the lower end of the miniature substrate (103), sliding frames (106) are slidably arranged in the four sliding grooves (112), two adhesives (107) are fixedly arranged in the four sliding frames (106), the adhesives (107) are two stable medicaments, a strong adhesive effect is generated after mixing, fixing frames (109) are fixedly arranged in the four sliding grooves (112), two puncture needles (108) are fixedly arranged on one sides, close to the adhesives (107), of the fixing frames (109), and tightening springs (110) are fixedly connected between the four fixing frames (109) and the four sliding frames (106); The signal processing mechanism (3) comprises a signal transmission module (305), wherein the signal transmission module (305) is electrically connected with the signal processing system and is used for wirelessly transmitting strain data to unmanned aerial vehicle inspection equipment to realize receiving monitoring signals in the air.
2. The real-time strain monitoring device for the reinforced concrete beam reinforced by the carbon fiber grid, as set forth in claim 1, is characterized in that two connecting frames (111) are fixedly connected to one side, far away from the miniature substrate (103), of each of the four sliding frames (106), two buckling frames (104) are fixedly arranged on one side, far away from the miniature substrate (103), of each of the two connecting frames (111), the two buckling frames (104) are respectively buckled on two ends of the carbon fiber grid, and the sliding frames (106) are driven to slide along sliding grooves (112) through the connecting frames (111) to adapt to the carbon fiber grids with different sizes.
3. The real-time strain monitoring device for the carbon fiber grid reinforced concrete beam of claim 1, wherein the signal processing mechanism (3) further comprises a protective shell (301), a plurality of signal interfaces (304) are fixedly arranged at the lower end of the protective shell (301), one end, far away from the resistance strain gauge (102), of the signal wire (2) is detachably connected with any one of the signal interfaces (304), and the shielding wire (105) is of a double-core shielding structure and is used for reducing external electromagnetic interference.
4. The real-time strain monitoring device for the reinforced concrete beam reinforced by the carbon fiber grid is characterized in that a radiating window (302) is arranged on one side of the inside of the protective shell (301), a dustproof net is arranged on the inner side of the radiating window (302), fixing plates (303) are fixedly arranged on two sides of the protective shell (301), and mounting holes are formed in the fixing plates (303) and used for fixing the protective shell (301) near or in a beam body.
5. The real-time strain monitoring device for the reinforced concrete beam reinforced by the carbon fiber grid according to claim 2, wherein the buckling frame (104) is of an elastic opening structure, anti-slip teeth are arranged on the inner side of the buckling frame and are attached to grid wires of the carbon fiber grid, and the anti-slip teeth are used for enhancing the tightness after buckling and avoiding relative sliding.
6. The device for monitoring the real-time strain of the reinforced concrete beam reinforced by the carbon fiber grid according to claim 1, wherein when the sliding frame (106) slides outwards to a preset position along the sliding groove (112), the puncture needle (108) can puncture the package of the adhesive (107) to mix and solidify the two medicaments, so that the sliding frame (106) and the inner wall of the sliding groove (112) are tightly adhered and fixed, and the sliding frame (106) is prevented from displacing relative to the miniature substrate (103).
7. The real-time strain monitoring device for the carbon fiber grid reinforced concrete beam is characterized in that a signal processing system of the signal processing mechanism (3) comprises a signal conditioning module, a microprocessor, a wireless communication module and a rechargeable lithium battery, the signal conditioning module is used for providing exciting voltage for a resistance strain gauge (102) and amplifying weak resistance change signals based on a Wheatstone bridge principle, the microprocessor is used for converting the amplified analog signals into digital quantity strain values, the wireless communication module is used for wirelessly transmitting strain data to an intelligent mobile terminal, the signal transmission module (305) is used for supporting establishment of stable communication connection with main unmanned aerial vehicle inspection equipment by adopting an unmanned aerial vehicle special communication protocol, and synchronous matching of the strain data and unmanned aerial vehicle vision acquisition data is achieved.

Description

Real-time strain monitoring device for reinforced concrete beam reinforced by carbon fiber grid Technical Field The invention relates to the technical field of constructional engineering, in particular to a real-time strain monitoring device for a reinforced concrete beam reinforced by carbon fiber grids. Background The carbon fiber grid (CFRPgrid) reinforcement technology is an important innovation direction in the reinforced concrete structure reinforcement field, and is characterized in that the carbon fiber grid is embedded into Polymer Cement Mortar (PCM), and then a composite reinforcement layer is adhered to the surfaces of components such as concrete beams, columns and the like (such as a beam bottom tension zone), so that the bending and shearing bearing capacity of the components is remarkably improved by virtue of the high-strength and corrosion-resistant characteristics of carbon fiber materials, and the carbon fiber grid reinforcement technology is gradually popularized and applied in building structure repair and reinforcement engineering. In practical engineering application, effect evaluation and long-term safety guarantee of a reinforcing structure become key requirements. In the prior art, the performance evaluation of the carbon fiber grid-polymer cement mortar reinforcing layer mainly depends on two modes, namely, a destructive test in a laboratory environment, wherein the destructive test is carried out to obtain limit performance data through loading to failure of a component, but the mode cannot reflect the actual service state of a structure, and a staged static load test and dynamic load test after the construction of the structure is completed, the local performance parameters can be obtained only at test time points, and continuous monitoring of the full service period cannot be realized. The evaluation mode has obvious limitations that on one hand, key state information such as stress strain evolution process in the reinforcing layer, sliding trend of a carbon fiber grid and a mortar interface, local stripping risk and the like are difficult to capture in real time because the key state information is positioned in a structure, and on the other hand, the performance of the reinforcing layer is degraded due to factors such as load change and environmental corrosion during the service period of the structure, so that the potential safety hazard of the structure cannot be timely perceived through a periodic test, the early warning mechanism is lacked, the engineering requirement of long-term health monitoring of the building structure is difficult to meet, and the safety management of the whole life cycle of the reinforced structure is restricted. Disclosure of Invention Technical problem to be solved Aiming at the defects of the prior art, the invention provides a real-time strain monitoring device for a carbon fiber grid reinforced concrete beam, which solves the problems that the prior assessment mode cannot monitor information such as stress strain, slippage and the like of a reinforcing layer in real time, potential safety hazards are difficult to early warn in time, and the safety of the full service period of a structure cannot be ensured when the carbon fiber grid reinforced concrete beam is reinforced. Technical proposal In order to achieve the purpose, the invention is realized by the following technical scheme that the real-time strain monitoring device for the carbon fiber grid reinforced concrete beam comprises: A signal processing mechanism having a signal processing system built therein; The monitoring mechanism comprises a miniature substrate, a resistance strain gauge is stuck to the upper end of the miniature substrate, a sealing protection layer is fixedly arranged at the upper ends of the miniature substrate and the resistance strain gauge, shielding wires are respectively connected to the two ends of the resistance strain gauge, and a signal wire is connected to the other end of the shielding wire; two sliding grooves are formed in two sides of the lower end of the miniature substrate, sliding frames are arranged in the four sliding grooves in a sliding mode, two adhesives are fixedly arranged in the four sliding frames, the adhesives are two stable medicaments, a strong adhesive effect is generated after mixing, fixing frames are fixedly arranged in the four sliding grooves, two puncture needles are fixedly arranged on one sides, close to the adhesives, of the fixing frames, and tightening springs are fixedly connected between the four fixing frames and the four sliding frames; The signal processing mechanism comprises a signal transmission module, wherein the signal transmission module is electrically connected with the signal processing system and is used for wirelessly transmitting strain data to unmanned aerial vehicle inspection equipment to realize receiving monitoring signals in the air. Preferably, four the sliding frames are kept away from two link fra