CN212780439U - A miniaturized durability monitoring sensor for concrete structure - Google Patents
A miniaturized durability monitoring sensor for concrete structure Download PDFInfo
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- CN212780439U CN212780439U CN202021264021.1U CN202021264021U CN212780439U CN 212780439 U CN212780439 U CN 212780439U CN 202021264021 U CN202021264021 U CN 202021264021U CN 212780439 U CN212780439 U CN 212780439U
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Abstract
The utility model relates to a miniaturized durability monitoring sensor for concrete structure belongs to reinforced concrete structure corrosion monitoring technical field. The miniaturized durability monitoring sensor comprises 4 working electrodes, a reference electrode, an auxiliary electrode and a sleeve, wherein the 4 working electrodes and the auxiliary electrode are annular and are sleeved outside the sleeve, the reference electrode is wrapped inside the sleeve, and meanwhile, each electrode wire is led out through the sleeve and collected on a wiring port above the sleeve to be connected out. The utility model discloses simple structure, simple to operate wholly influences for a short time reinforced concrete structure, adopts a plurality of working electrodes simultaneously, avoids when a working electrode goes wrong, and the sensor can't work, influences the problem of data accuracy, reduces cost of maintenance.
Description
Technical Field
The utility model belongs to the technical field of reinforced concrete structure corrosion monitoring, concretely relates to a small-size durability monitoring sensor for concrete structure.
Background
The marine concrete is in a marine corrosive environment of chlorine salt erosion all the year round, so that the reinforced concrete is easy to corrode, the durability of the reinforced concrete structure is poor, and the marine concrete needs to be monitored all the time. At present, a corrosion monitoring sensor commonly used for a marine concrete structure mainly comprises an anode ladder and ECI (engineering reinforced concrete), the anode ladder is large in size, and in some projects, the anode ladder cannot be installed at a set position due to dense steel bar wrapping. And the anode ladder installation procedure is loaded down with trivial details, for guaranteeing the sensor survival rate, the installation is comparatively wasted time and energy usually. Although the ECI sensor can monitor multiple parameters such as the concentration of chloride ions in concrete, the potential of a steel bar electrode, the pH value and the like, the ECI sensor only contains one working electrode, when the electrode has a problem, effective checking cannot be carried out, and the accuracy of electrode data is questioned. And the two sensors are imported products abroad, so that the cost is high, the volume is large, and the field installation and construction are inconvenient.
In view of the foregoing, there is a need for a miniaturized and easily-installed multi-working-electrode durability sensor that is convenient to install in concrete and can monitor the corrosion of the structure at different concrete depths, thereby avoiding the above-mentioned problems.
SUMMERY OF THE UTILITY MODEL
For solving the technical defect, the utility model provides a simple structure, reasonable in design, simple to operate's miniaturized durability monitoring sensor adopts three electrode systems and multiplex electrode, can monitor the corruption electric potential and the corrosion current of the different degree of depth of reinforcing bar, reflects reinforced concrete structure's the safe condition more comprehensively effectively.
The utility model discloses a realize through following technical scheme:
a miniaturized durability monitoring sensor for a concrete structure includes an external electrode, a reference electrode, and a sleeve; the sleeve comprises an outer sleeve and an inner sleeve, and the top of the sleeve is provided with a wiring port; the external electrodes comprise 4 working electrodes and 1 auxiliary electrode, the working electrodes and the auxiliary electrodes are annular, the working electrodes and the auxiliary electrodes are sequentially sleeved outside the outer-layer sleeve, two working electrodes are respectively arranged above and below the outer-layer sleeve, and two adjacent external electrodes are isolated by a rubber ring; the reference electrode is cylindrical and is wrapped by the inner-layer sleeve, and the probe is exposed out of the wiring port at the top of the sleeve; each electrode is provided with an outer guide wire, the wires of the working electrode and the auxiliary electrode pass through the outer sleeve and are collected at a wiring port above the inner sleeve to be connected out, and the reference electrode wire is led out from the top end of the probe; outer sleeve pipe and inlayer sleeve pipe constitute parcel formula sleeve structure, and inlayer sleeve pipe bottom is sealed has the ceramic semipermeable membrane, and outer sleeve pipe bottom is equipped with a pipe cap for sealed whole sleeve structure.
Preferably, the reference electrode comprises an Ag/AgCl electrode bar and an electrolyte, the Ag/AgCl electrode bar is soaked in the electrolyte, the surface of the Ag/AgCl electrode bar is covered with a compact AgCl film layer, and the electrolyte is a polyvinyl alcohol-agar gel electrolyte.
Preferably, the working electrode is steel bar or carbon steel, and the auxiliary electrode is stainless steel; the auxiliary electrode is made of stainless steel, so that the cost can be reduced, and compared with common inert electrodes such as platinum electrodes and graphite electrodes, the auxiliary electrode is made of stainless steel, so that the hardness of the auxiliary electrode is higher and the cost is lower.
Preferably, the sensor is cylindrical as a whole, and the diameter of the cross section of the sensor is less than or equal to 40mm, and the height of the sensor is less than or equal to 100 mm.
Preferably, the sleeve is made of polytetrafluoroethylene.
Preferably, the ceramic semipermeable membrane is made of a porous alumina material.
Preferably, the space between the wires between the outer sleeve and the inner sleeve is filled with epoxy resin.
Compared with the prior art, the utility model discloses there is following technological effect at least:
the utility model provides a pair of a miniaturized durability monitoring sensor for concrete structure, it is small, the installation is simple, both can regard as pre-buried formula sensor to install when concrete placement period, also can regard as back-mounted formula sensor to use, at concrete festival rear surface assigned position drilling, bury the sensor, seal with the mortar and bury. The influence on the concrete structure is small, and the requirement of the corrosion monitoring sensor for the harbor engineering structure can be met.
This sensor is through adopting three electrode systems and multiplex working electrode, and 4 working electrode and auxiliary electrode arrange in proper order, measure the corrosion potential and the corrosion current of reinforcing bar under the different concrete degree of depth respectively to judge the reinforcing bar condition of corroding in the concrete effectively in time, when a working electrode goes wrong, the sensor can't work simultaneously, influences the problem of data accuracy.
Drawings
The specific aspects of the present invention will be further explained with reference to the accompanying drawings:
FIG. 1 is a cross-sectional view of a sensor structure;
FIG. 2 is a top view of the sensor structure;
wherein the reference numbers indicate:
1-working electrode (ring carbon steel); 2-an annular rubber ring; 3-a wiring port; 4-a wire; 51-outer layer polytetrafluoroethylene tube; 52-inner polytetrafluoroethylene tube; 6-auxiliary electrode (ring shaped stainless steel); 7-Ag/AgCl probe; 8-polyvinyl alcohol-agar gel electrolyte; 9-polytetrafluoroethylene cap; 10-ceramic semipermeable membranes.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and more obvious, the present invention is further described below with reference to the accompanying drawings and specific examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 1 and 2 together, the present embodiment provides a small-sized durability monitoring sensor for a concrete structure, including 5 external electrodes, a reference electrode, and a sleeve; the 5 external electrodes are sleeved outside the sleeve, and the reference electrode is wrapped inside the sleeve; the external electrodes include 4 working electrodes 1 and 1 auxiliary electrode 6. The sensor can respectively measure the corrosion potential and the corrosion current of the steel bar under different concrete depths by adopting a three-electrode system and a plurality of working electrodes, thereby effectively judging the corrosion condition of the steel bar in the concrete in time.
Specifically, the sleeve is a polytetrafluoroethylene tube and is divided into an outer polytetrafluoroethylene tube 51 and an inner polytetrafluoroethylene tube 52, a wiring port 3 is formed in the top of the polytetrafluoroethylene tube, 4 working electrodes 1 and 1 auxiliary electrode 6 are sleeved on the outer surface of the outer polytetrafluoroethylene tube 51, the working electrodes 1 and the auxiliary electrodes 6 are both annular, two working electrodes 1 are respectively arranged above and below the outer polytetrafluoroethylene tube 51, and two adjacent external electrodes are isolated by an annular rubber ring 2; the inner polytetrafluoroethylene tube 52 wraps the reference electrode, the reference electrode is cylindrical, and the probe of the reference electrode is exposed out of the wiring port 3; the outer-layer polytetrafluoroethylene tube 51 and the inner-layer polytetrafluoroethylene tube 52 form a wrapping type sleeve structure, the bottom of the inner-layer polytetrafluoroethylene tube 52 is provided with a ceramic semipermeable membrane 10, and the bottom of the outer-layer polytetrafluoroethylene tube 51 is provided with a polytetrafluoroethylene tube cap 9 for sealing the whole sleeve structure.
Specifically, each electrode is provided with a lead, the leads of the working electrode 1 and the electrode 6 pass through the outer-layer polytetrafluoroethylene tube 51, are collected above the inner-layer polytetrafluoroethylene tube 52 and are connected out through the wiring port 3, and the lead 4 and the polytetrafluoroethylene tube are filled and fixed by epoxy resin; the lead of the reference electrode is led out from the top end of the probe.
Based on the scheme, the utility model discloses a three-electrode system, through working electrode 1 and reference electrode constitution return circuit, measure the potential between reference electrode and each working electrode 1, according to the potential difference between data result comparative analysis working electrode 1, judge whether the reinforcing bar corrodes under the different degree of depth in the concrete structure; meanwhile, a loop is formed by the working electrode 1 and the auxiliary electrode 6, the function of transmitting electrons to form the loop is achieved, the current between each working electrode 1 and each auxiliary electrode 6 is measured, whether corrosion current exists or not is judged, the corrosion rate of the steel bar is judged according to the current, and therefore the health condition of the reinforced concrete structure is comprehensively judged.
Furthermore, the reference electrode in the embodiment comprises an Ag/AgCl probe 7 and a polyvinyl alcohol-agar gel electrolyte 8, the Ag/AgCl probe 7 is soaked in the polyvinyl alcohol-agar gel electrolyte 8, and a compact AgCl film layer is covered on the surface of the Ag/AgCl probe by adopting an electroplating method; the solid Ag/AgCl reference electrode packaged by the gel electrolyte can well block the loss of the electrolyte, and has good stability and long service life.
Further, in the embodiment, the working electrode adopts annular carbon steel 1, and the auxiliary electrode adopts annular stainless steel 6; the auxiliary anode electrode is generally an inert electrode, usually a platinum electrode, a graphite electrode and the like, but the platinum electrode is expensive, the graphite electrode is brittle and easy to damage, and stainless steel is used as the auxiliary electrode, has high hardness and low price and is suitable for being used as the auxiliary anode electrode; in other embodiments, the working electrode may also be made of electrode materials such as steel bars in the engineering field according to the actual engineering.
Furthermore, the whole structure of the sensor is cylindrical, the diameter of the cross section of the sensor is not more than 40mm, and the height of the sensor is not more than 100 mm; the corrosion monitoring sensor that present marine concrete structure was used commonly is mostly the great sensor of this kind of bodily form of positive pole, ECI, and it is comparatively difficult to install many times, and causes destruction to concrete structure easily, and the sensor that this embodiment provided, the volume is less, simple to operate, and is less to concrete structure influence.
Furthermore, the ceramic semipermeable membrane is made of a porous alumina material, and the gel electrolyte 8 of the reference electrode is subjected to ion exchange with the outside through the porous ceramic semipermeable membrane 10, so that the accuracy of the monitoring result is ensured.
Further, the wire clearance between outer sleeve pipe and the inlayer sleeve pipe is filled with epoxy, inside the whole sleeve structure of embedment, fixed wire position.
To sum up, the utility model discloses a miniaturized durability monitoring sensor for concrete structure, small, easy installation, it is less to concrete structure influence, through adopting three electrode systems and multiplex to do electrode 1, effectively measure the corruption electric potential and the corrosion current of reinforcing bar in the concrete structure under the different degree of depth to judge the corruption condition of reinforcing bar in the concrete structure better, simultaneously can be fine avoid when a working electrode goes wrong, the sensor can't work, influence the problem of data accuracy.
The present invention is not limited to the above embodiment, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology if they do not depart from the spirit and scope of the present invention.
Claims (7)
1. A miniaturized durability monitoring sensor for a concrete structure, comprising an external electrode, a reference electrode and a sleeve; the sleeve comprises an outer sleeve and an inner sleeve, and the top of the sleeve is provided with a wiring port; the external electrodes comprise 4 working electrodes and 1 auxiliary electrode, the working electrodes and the auxiliary electrodes are annular, the working electrodes and the auxiliary electrodes are sequentially sleeved outside the outer-layer sleeve, the auxiliary electrodes are arranged in the middle, two working electrodes are respectively arranged above and below the auxiliary electrodes, and two adjacent external electrodes are isolated by a rubber ring; the reference electrode is cylindrical and is wrapped by the inner sleeve, and the probe is exposed out of the wiring port at the top of the sleeve; each electrode is provided with a lead, the leads of the working electrode and the auxiliary electrode penetrate through the outer-layer sleeve and are collected at a wiring port above the inner-layer sleeve to be connected out, and the lead of the reference electrode is led out from the top end of the probe; outer sleeve pipe and inlayer sleeve pipe constitute parcel formula sleeve structure, and inlayer sleeve pipe bottom is sealed has the ceramic semipermeable membrane, and outer sleeve pipe bottom is equipped with a pipe cap for sealed whole sleeve structure.
2. The miniaturized durability monitoring sensor for concrete structure of claim 1, wherein the reference electrode comprises Ag/AgCl electrode bar and electrolyte, the Ag/AgCl electrode bar is soaked in the electrolyte, and its outer surface is covered with a dense AgCl film layer, the electrolyte is polyvinyl alcohol-agar gel electrolyte.
3. The miniaturized durability monitor sensor for concrete structure of claim 1, wherein the working electrode is steel bar or carbon steel and the auxiliary electrode is stainless steel.
4. The miniaturized durability monitor sensor for concrete structure of claim 1, wherein the sensor has an overall cylindrical shape with a cross-sectional diameter of 40mm and a height of 100 mm.
5. The miniaturized durability monitor sensor for concrete structure of claim 1, wherein the sleeve is made of teflon.
6. The miniaturized durability monitor sensor for concrete structure of claim 1, wherein the ceramic semi-permeable membrane is made of porous alumina material.
7. The miniaturized durability monitor sensor for concrete structure of claim 1, wherein the gap between the wires between the outer sleeve and the inner sleeve is filled with epoxy resin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021264021.1U CN212780439U (en) | 2020-07-01 | 2020-07-01 | A miniaturized durability monitoring sensor for concrete structure |
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| CN202021264021.1U CN212780439U (en) | 2020-07-01 | 2020-07-01 | A miniaturized durability monitoring sensor for concrete structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115265354A (en) * | 2022-07-26 | 2022-11-01 | 福州大学 | Reinforced concrete structure corrosion depth monitoring device and using method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115265354A (en) * | 2022-07-26 | 2022-11-01 | 福州大学 | Reinforced concrete structure corrosion depth monitoring device and using method thereof |
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