CN1945278A - Long term monitoring sensor for steel bar corrosion in steel concrete member - Google Patents
Long term monitoring sensor for steel bar corrosion in steel concrete member Download PDFInfo
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- CN1945278A CN1945278A CN 200610117060 CN200610117060A CN1945278A CN 1945278 A CN1945278 A CN 1945278A CN 200610117060 CN200610117060 CN 200610117060 CN 200610117060 A CN200610117060 A CN 200610117060A CN 1945278 A CN1945278 A CN 1945278A
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Abstract
The long term monitoring sensor for corrosion of steel bar in steel concrete member consists of electrode rods in the same length, pedestal, wires and sacrificed anode. The electrode rods are fixed in the sensor pedestal in stepped form, and the wires are connected through leaf springs to the anode and cathode of the electrode rods. During construction, the monitoring sensor is embedded into the concrete for subsequent regular data acquisition. In the case of finding out corroded steel bar in some electrode rod, the steel bar is protected via the cathode protector. The present invention can perform non-destroying detection of the steel bars in different depth and determine the frontal surface distance of the invading corrosive medium.
Description
Technical field
The present invention relates to sensor for monitoring reinforcement corrosion long-term in a kind of reinforced concrete member, can detect for a long time the reinforcement corrosion situation in the reinforced concrete member under the chloride environment and do not damage concrete surface, the permanance that is applied to reinforced concrete structure in the Structural Engineering field detects and assessment.
Background technology
The steel bar in reinforced concrete corrosion is one of major influence factors that influences structure durability.Compare with the reinforcement corrosion that the concrete cover carbonization causes, the reinforcement corrosion speed that chlorion invasion causes faster (approximately be the reinforcement corrosion speed that causes of carbonization 10 times), the loss that causes are bigger, have caused the extensive concern of engineering circle and academia.
The chlorine ion concentration control of in the engineering concrete being stirred in thing or the adjuvant at present is generally tighter, and therefore, the chloride ion corrosion in the concrete is because chlorion from outside invading, and in the rebar surface accumulation, reaches and causes after certain concentration mostly.Can cause that the chlorion least concentration that reinforcing bar begins to corrode is called critical concentration.
Because the reinforcement corrosion speed that the chlorion invasion causes is fast, and corrosion generation in a single day, be difficult to adopt an effective measure and eradicated.Therefore, the countermeasure that should take in the actual engineering is: adopt the effective monitoring means of a cover, before reinforcement corrosion does not begin as yet, find early to cause the hidden danger of reinforcement corrosion, and take appropriate measures and take precautions against targetedly.With find reinforcement corrosion after the method handled again compare, this countermeasure will play a multiplier effect, and compare with the preservative treatment of reruning after reinforcing bar begins corrosion, economically consume for a short time, antiseptic effect is better.
For reaching above purpose, the patent No. provides the sensor and the detection method of reinforcement corrosion in a kind of reinforced concrete member for the Chinese invention patent of ZL 03 1 15903.6, its feature comprises: choose the bar reinforcement identical with the used reinforcing bar material of engineering and with the stainless steel bar of bar reinforcement same diameter, equal length, according to the order from growing to lacking, bar reinforcement is become with stainless steel bar in the stepped pickup groove that is inserted in sensor base side by side, and connect by lead, make sensor.Before the deposit concrete, the pedestal of sensor is fixed on the reinforcing bar in the concrete component.In the operating period of structure, bar reinforcement that electricity consumption digit current instrument measurement regularly is arranged side by side and macro cell corrosion electric current and the potential difference (PD) between the stainless steel bar are carried out periodic monitoring to sensor.
Sensor in this invention has following shortcoming:
1. distance is bigger between the anode and cathode, makes that concrete resistance is bigger in current return, and monitoring result is had a negative impact.
2. the anode and cathode area is identical.Because general corrosion all has big negative electrode primary anode, identical anode and cathode area does not meet actual conditions.
3. after the reinforcement corrosion in the sensor, because corrosion product occupies bigger volume than the steel that corrode, expansion has destruction to concrete cover, increases the concrete perviousness in test position, and monitoring result is produced bigger influence.
4. do not have stationary installation, the sensor location is relatively more difficult when deposit concrete.
5. volume is bigger, is difficult for plug hole location (particularly when arrangement of reinforcement is closeer) in bar-mat reinforcement.
6. the side of reinforcing bar and stainless steel bar needs encapsulation process, and complex procedures and the time being damaged in construction easily influences monitoring result.
For avoiding above shortcoming, need do further to improve to above-mentioned existing sensor, to satisfy the demand of engineering reality.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, sensor for monitoring reinforcement corrosion long-term in a kind of reinforced concrete member is provided, can intuitively and exactly judge the etch state of reinforcing bar, can be under the prerequisite of not damaging concrete surface, detect under the concrete working environment dangerous sharp side exactly apart from the reinforcing bar distance.
For realizing this purpose, sensor provided by the invention improves on existing patent of invention (patent No.: ZL 03 115903.6) basis and innovates.Sensor is made up of electrode bar, pedestal, lead and the sacrificial anode of some equal in length, and electrode bar becomes stepped appearance to be fixed in the pickup groove of sensor base, and lead is connected with the anode and cathode of electrode bar respectively by spring leaf.During construction detecting sensor is imbedded concrete, in the operating period of structure, regularly sensor is carried out data acquisition, after the reinforcing bar in finding certain electrode bar corrodes, reinforcing bar is carried out anti-corrosion protection by cathodic protector.
Particular content of the present invention is as follows:
Sensor is by the bar reinforcement of some equal in length (length is determined according to thickness of concrete cover), form with bar reinforcement equal number and the stainless-steel tube (internal diameter is than the big 2mm of bar reinforcement external diameter) of length, stepped pedestal, sacrificial anode and lead.
Each ladder central authorities of stepped pedestal have a pickup groove, insert an electrode bar in each pickup groove and are compressed by the veneer spring leaf that is arranged on the pickup groove inwall.
Electrode bar is by constituting as the bar reinforcement of anode with as the stainless-steel tube of negative electrode, stainless-steel tube is enclosed within the bar reinforcement outside, infusion epoxy resin is to guarantee insulation between bar reinforcement and the stainless-steel tube, the projection joint that bar reinforcement one end is provided with inserts in the central cylindrical shape groove of pickup groove bottom surface, and is realized connecting and fixing by the belt spring leaf that is provided with in the groove.Described veneer spring leaf and belt spring leaf are connected to the cable interface of pedestal side by being embedded in lead in the pedestal respectively.
The two ends of stepped pedestal respectively are provided with a locating bar, a sacrificial anode is fixed at the two ends of every locating bar, sacrificial anode is communicated to the cable interface by the lead that is embedded in the locating bar, and the outer lead that is connected with the cable interface is connected on the outdoor socket of concrete surface.Stepped pedestal is fixed on the structure main reinforcement in the concrete component by locating bar.
The bottom surface of described locating bar and the end face of minimum electrode bar are on same level, and the exposed surface of bar reinforcement is parallel with the concrete surface of cast, and the workplace of high bar reinforcement is not more than 5mm apart from concrete surface.
The material of described sacrificial anode is a spelter, and spelter outer wrapping pH value is that about 7 modified mortar is to guarantee the activity of spelter.
During measurement two electrodes of current potential electric current instrument are connected respectively to the bar reinforcement and the stainless-steel tube of same electrode bar by outdoor socket, measure macro cell corrosion electric current and potential difference (PD) between bar reinforcement and the stainless-steel tube.If potential difference (PD) is very little, Dui Ying grand electric current is also very little with it, illustrates that dangerous sharp side does not reach the tested end face degree of depth of tested bar reinforcement.Otherwise, illustrate that then this rebar surface has been subjected to the influence on dangerous sharp side.
After the electrode bar generation reinforcement corrosion of finding certain degree of depth, at outdoor socket place the bar reinforcement on sacrificial anode and this electrode bar is passed through the wire jumper short circuit, form cathodic protection to this corrosion reinforcing bar, can prevent that it from continuing the corrosion failure concrete cover.
Sensor of the present invention can distribute by multiple spot, and buildings is effectively guarded.
Compared with prior art, the present invention has following tangible advantage:
1. the distance between the anode and cathode is short, and the concrete resistance in the current return is little, and is little to the influence of test result;
2. ratio of cathodic to anodic area is bigger, and more compound actual conditions, measuring current are responsive more;
3. cathodic protector prevents because the outer concrete early damage that corrosion product expands and causes corrosion reinforcing bar generation protective effect.
4. locating device makes and fixes easyly between sensor and the reinforcing bar, and can guarantee relative position between sensor electrode and the structure main reinforcement.
5. owing to adopted the construction measure of cathode sheath anode, sensor bulk is effectively reduced, made things convenient for on-the-spot location.
6. all Connecting line joints are all in engineering plastics inside, and the epoxy resin protection is arranged, and have guaranteed the reliability and the permanance of breakage easily such as route joint.
7. be connected simply between electrode and the bearing, electrically contact reliable, easy to operate.
Detecting sensor of the present invention is simple in structure, easy to process, the reinforcing bar that adopts is gathered materials on the spot, or choose and the identical reinforcing bar of the used reinforcing bar material of engineering, test environment and actual components environmental facies with, that macro cell corrosion between bar reinforcement and the stainless steel bar is measured is simple and directly perceived, accurately, is easy to judge the etch state of reinforcing bar, can under the prerequisite of not damaging concrete surface, determine the distance of corrosive medium invasion sharp side accurately and easily apart from the member reinforcing bar.
Description of drawings
Fig. 1 is a sensor shaft side figure of the present invention.
Among Fig. 1,1 is sacrificial anode, and 2 is the locating bar of sensor, and 3 is the structure main reinforcement, and 4 is bar reinforcement (anode), and 5 is stainless-steel tube (negative electrode), and 6 is stepped pedestal.
Fig. 2 is the sensor cross-sectional view.
Among Fig. 2,2 is locating bar; 3 is the structure main reinforcement, and 4 is bar reinforcement, and 5 is stainless-steel tube, and 6 is stepped pedestal, and 7 is the projection joint of bar reinforcement, 8 is annular spring leaf, and 9 is epoxy resin, and 10 is lead, and 11 is the veneer spring leaf, 12 is the cable interface, and 13 is the epoxy resin injection orifice, and 15 is outdoor socket, and 16 is outer lead.
Fig. 3 is the electrode bar structural representation.
Among Fig. 3,4 is bar reinforcement, and 5 is stainless-steel tube, and 7 is the projection joint, and 9 is epoxy resin.
Fig. 4 is the test philosophy synoptic diagram.
Among Fig. 4,3 is the structure main reinforcement, and 6 is stepped pedestal, and 14 is concrete, and 15 is outdoor socket, and 16 is outer lead, the 17 dangerous sharp sides for the etching medium invasion.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is described in further detail.
The sensor construction that the present invention adopts comprises stepped pedestal 6, inserts in electrode bar in stepped pedestal 6 pickup grooves and the cable interface 12 that links to each other with the lead 10 of drawing from electrode bar as shown in Figure 1 and Figure 2.
Electrode bar is by constituting as the bar reinforcement 4 of anode with as the stainless-steel tube 5 of negative electrode.Choose and the identical reinforcing bar of the used reinforcing bar material of engineering; become the bar reinforcement 4 of a certain diameter as anode with machined into; the length of bar reinforcement 4 is by the protective layer thickness decision (as the protective layer thickness of 30mm, then the length of bar reinforcement is 30-5+10=35mm) of structure reinforcing bars.The stainless-steel tube 5 of making and bar reinforcement 4 equal length is as negative electrode simultaneously, and the internal diameter of stainless-steel tube is that the diameter of bar reinforcement adds 2mm.Stainless-steel tube 5 is enclosed within bar reinforcement 4 outsides, infusion epoxy resin 9 between bar reinforcement 4 and stainless-steel tube 5, the back, location guarantees insulation between bar reinforcement 4 and the stainless-steel tube 5.End at bar reinforcement 4 processes the high projection joint 7 (as shown in Figure 3) of 7mm, and projection joint 7 inserts in the central cylindrical shape groove of pickup groove bottom surface, and is realized connecting and fixing by the belt spring leaf 8 that is provided with in the groove.
Stepped pedestal 6 is made by engineering plastics, and each ladder central authorities of stepped pedestal 6 have the pickup groove of a diameter than the big 4mm of stainless-steel tube external diameter, fixing groove depth 15mm, and the pickup groove inwall is provided with veneer spring leaf 11.After electrode bar inserts pickup groove, between veneer spring leaf 11 and the electrode bar because elasticity and closely contacting.Central authorities open the 8mm diameter in addition in the bottom surface of pickup groove, and the cylindrical groove of dark 9mm is established belt spring leaf 8 in the groove, and after electrode bar inserted pickup groove, projection joint 7 inserted the spring leaf 8 that goes in ring, and closely contact with it, finish connection and fixing.Veneer spring leaf 11 and belt spring leaf 8 are connected to the cable interface 12 (AUI interface) of pedestal side by being embedded in lead 10 in the pedestal respectively.After electrode bar is in place, utilize syringe that epoxy resin is injected into hole between electrode bar and the pedestal by injection orifice 13, simultaneously air is discharged, finish encapsulation process.
The two ends of stepped pedestal 6 respectively are provided with a locating bar 2, and locating bar 2 is made by engineering plastics.The bottom surface of locating bar 2 and the end face of minimum electrode bar are on same level.Before deposit concrete, stepped pedestal 6 is fixed on the structure main reinforcement 3 in the concrete component by locating bar 2.During the location, according to position shown in Figure 1 locating bar 2 usefulness iron wires are bundled on the structure main reinforcement 3, the end face that can guarantee minimum electrode bar is surperficial concordant with structure main reinforcement 3 just in time.When finding that corrosion takes place minimum bar reinforcement, description architecture main reinforcement 3 also corrodes.In fixing process, should guarantee between electrode bar and the structure main reinforcement can not short circuit; The exposed surface of bar reinforcement 4 is parallel with concrete surface; And guarantee that outermost (the highest) bar reinforcement workplace is not more than 5mm apart from concrete surface.
Four sacrificial anodes 1 of fixing on 1, two locating bar 2 of a sacrificial anode at the two ends of every locating bar 2 constitute cathodic protector.The material of sacrificial anode 1 is a spelter, is the activity of assurance spelter, spelter coated outside modified mortar, and the pH value of modified mortar should be controlled at about 7.Welding lead on the sacrificial anode 1, lead are embedded in the locating bar 2, are communicated to cable interface 12.
Detecting instrument is the current potential electric current instrument of buying on the market, during measurement two electrodes of current potential electric current instrument are connected respectively to the bar reinforcement 4 and the stainless-steel tube 5 of same electrode bar by outdoor socket 15, measure content and be macro cell corrosion electric current and potential difference (PD) between bar reinforcement 4 and the stainless-steel tube 5.According to the bimetallic corrosion principle, when reinforcing bar was in passive state, the potential difference (PD) between bar reinforcement 4 and the stainless-steel tube 5 was very little, and Dui Ying grand electric current is also very little with it.As this situation appears, illustrate that dangerous sharp side 17 does not reach the tested end face degree of depth (Fig. 4) of tested bar reinforcement.Otherwise, if find that unexpected increase has taken place for macro cell corrosion electric current and potential difference (PD) when measuring once more after a while, illustrating that then this rebar surface has been subjected to the influence on dangerous sharp side 17, this test reinforcing bar case depth has been developed on dangerous sharp side 17.
After the electrode bar generation reinforcement corrosion of finding certain degree of depth, at outdoor socket 15 places the bar reinforcement on sacrificial anode 1 and this electrode bar 4 is passed through the wire jumper short circuit, form cathodic protection to this corrosion reinforcing bar, prevent that it from continuing the corrosion failure concrete cover.
Sensor is carried out periodic monitoring, can find As time goes on, the rebar surface quantity that is subjected to 17 influences of dangerous sharp side increases gradually, and the degree of depth is deepened gradually.
Can deduct the dangerous sharp side development degree of depth with the protective layer thickness of structure main reinforcement 3; obtain the distance on distance structure main reinforcement 3 surfaces, dangerous sharp side; and judge that dangerous sharp side approaches the speed of member reinforcing bar; closely formulate rational maintenance game; before structure main reinforcement 3 does not begin corrosion, in time take methods such as cathodic protection, electrochemical dechlorination to prevent that the structure main reinforcement from beginning corrosion.
Sensor of the present invention can be arranged in the different parts (as the profundal zone of bridge post, spatter Lang Qu, dry section) of member, and can arrange a plurality of points simultaneously in each zone, and buildings is effectively guarded.
Claims (3)
1, sensor for monitoring reinforcement corrosion long-term in a kind of reinforced concrete member, comprise stepped pedestal (6), insert in electrode bar in stepped pedestal (6) pickup groove and the cable interface (12) that links to each other with the lead of drawing (10) from electrode bar, it is characterized in that: each ladder central authorities of stepped pedestal (6) have a pickup groove, insert an electrode bar in each pickup groove and are compressed by the veneer spring leaf (11) that is arranged on the pickup groove inwall; Electrode bar is by constituting as the bar reinforcement (4) of anode with as the stainless-steel tube (5) of negative electrode, stainless-steel tube (5) is enclosed within bar reinforcement (4) outside, infusion epoxy resin (9) is to guarantee insulation between bar reinforcement (4) and the stainless-steel tube (5), the projection joint (7) that bar reinforcement (4) one ends are provided with inserts in the central cylindrical shape groove of pickup groove bottom surface, and is realized connecting and fixing by the belt spring leaf (8) that is provided with in the groove; Described veneer spring leaf (11) and belt spring leaf (8) are connected to the cable interface (12) of pedestal side by being embedded in lead (10) in the pedestal respectively; The two ends of stepped pedestal (6) respectively are provided with a locating bar (2), a sacrificial anode (1) is fixed at the two ends of every locating bar (2), sacrificial anode (1) is communicated to cable interface (12) by the lead that is embedded in the locating bar (2), and the outer lead (16) that is connected with cable interface (12) is connected on the outdoor socket (15) of concrete surface; Stepped pedestal (6) is fixed on the structure main reinforcement (3) in the concrete component by locating bar (2).
2, according to sensor for monitoring reinforcement corrosion long-term in the reinforced concrete member of claim 1, the end face that it is characterized in that the bottom surface of described locating bar (2) and minimum electrode bar is on same level, concrete (14) surface of the exposed surface of bar reinforcement (4) and cast is parallel, and the workplace of high bar reinforcement is not more than 5mm apart from concrete surface.
3, according to sensor for monitoring reinforcement corrosion long-term in the reinforced concrete member of claim 1, the material that it is characterized in that described sacrificial anode (1) is a spelter, and spelter outer wrapping pH value is that 7 modified mortar is to guarantee the activity of spelter.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101170607A CN100454000C (en) | 2006-10-12 | 2006-10-12 | Long term monitoring sensor for steel bar corrosion in steel concrete member |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101170607A CN100454000C (en) | 2006-10-12 | 2006-10-12 | Long term monitoring sensor for steel bar corrosion in steel concrete member |
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| CN1945278A true CN1945278A (en) | 2007-04-11 |
| CN100454000C CN100454000C (en) | 2009-01-21 |
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