CN110541576A - Underground structure leakage crack field repairing device and method based on electrodeposition - Google Patents
Underground structure leakage crack field repairing device and method based on electrodeposition Download PDFInfo
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- CN110541576A CN110541576A CN201910754581.0A CN201910754581A CN110541576A CN 110541576 A CN110541576 A CN 110541576A CN 201910754581 A CN201910754581 A CN 201910754581A CN 110541576 A CN110541576 A CN 110541576A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
- C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
- C23F13/22—Monitoring arrangements therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/17—Geometrical or physical properties including an electric conductive element
Abstract
The invention relates to an underground structure leakage crack on-site repairing device and method based on electrodeposition, which are used for repairing a structural crack not exceeding 2mm, and the device comprises: adjustable DC power supply: to generate an adjustable weak current; electrolyte carrier: the electrolytic solution is externally hung at the crack of the damaged underground structure with the crack and is used for bearing the electrolyte required during electrolysis, and an electrodeposition repair anode is arranged in the electrolyte and is connected with the anode of the adjustable direct-current power supply through a lead; reinforcing steel bars: the cathode is arranged in a damaged underground structure with cracks and used as an electrodeposition repair cathode, and is connected with the cathode of an adjustable direct current power supply through a lead. Compared with the prior art, the method has the advantages of nondestructive repair, erosion reduction, repair adjustability, real-time monitoring and the like.
Description
Technical Field
the invention relates to the field of leakage crack repair, in particular to an underground structure leakage crack on-site repair device and method based on electrodeposition.
background
The underground structure will inevitably produce cracks under the action of internal and external environments such as underground water, soil pressure, train repeated vibration load (such as subway lining structure), temperature stress and the like, and the health service performance of the underground structure is seriously influenced. The development of concrete crack repair of underground structures has been the focus of current research.
Different repairing methods exist for different concrete cracks, for example, the surface treatment method can be used for repairing the micro cracks on the surface layer conveniently, and the filling method can be used for repairing the larger surface cracks, but the methods can not be used for repairing the internal cracks. For permeable underground structural cracks, grouting methods are commonly adopted for repairing at present. However, the grouting method often requires the processes of drilling, grouting and the like, has great damage to the structure body, and has apparent quality problems of color difference and the like on the surface of the repaired structure. Moreover, the mud splashing to constructors is easy to hurt in the mud jacking process, and hidden danger is brought to construction safety.
The electrochemical deposition method is a novel concrete crack repairing means suitable for the water environment, the crack repairing process does not need to be perforated, the damage to the structure is small, meanwhile, the repairing process is mainly conducted through weak electric field induction, and the safety of constructors is hardly influenced.
Internationally, the research of repairing the marine concrete structure by an electrochemical deposition method is started from the late stage of the 20 th century in Japan, reinforcing steel bars in the marine concrete structure with cracks are taken as cathodes, insoluble anodes are placed in seawater, weak current is applied between the reinforcing steel bars and the insoluble anodes, positive ions and negative ions respectively move to the two poles under the action of potential difference, a series of reactions occur, finally, sediments are generated on the surface and in the cracks of the marine concrete structure, the sediment covers the surface of concrete, and the concrete cracks are healed. These deposits not only provide a physical protective layer to the concrete but also to some extent prevent the harmful substances from attacking the concrete, as shown in particular in fig. 1.
currently, the research on the electrodeposition method for repairing the concrete cracks of the underground structure is few, and the research on the field repair of the cracks of the underground structure by the electrodeposition method is almost blank.
disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an electrodeposition-based underground structure leakage crack on-site repairing device and method.
The purpose of the invention can be realized by the following technical scheme:
an electrodeposition-based in-situ repair device for leaking cracks in underground structures, for repairing structural cracks not exceeding 2mm, comprising:
Adjustable DC power supply: to generate an adjustable weak current;
Electrolyte carrier: the electrolytic solution is externally hung at the crack of the damaged underground structure with the crack and is used for bearing the electrolyte required during electrolysis, and an electrodeposition repair anode is arranged in the electrolyte and is connected with the anode of the adjustable direct-current power supply through a lead;
reinforcing steel bars: the cathode is arranged in a damaged underground structure with cracks and used as an electrodeposition repair cathode, and is connected with the cathode of an adjustable direct current power supply through a lead.
Further, the electrolyte is a complex salt electrolyte solution.
Furthermore, the electrodeposition repair anode can be made of conductive materials such as ruthenium-iridium-titanium plates or graphite.
Furthermore, the electrolyte carrier is a container for carrying electrolyte, such as an acrylic basin or gel.
Furthermore, a plurality of reference electrode embedding holes for arranging reference electrodes are formed in the damaged underground structure with the cracks.
An electrodeposition-based underground structure leakage crack field repairing method comprises the following steps:
1) The pretreatment of on-site repair specifically comprises the following steps:
11) Concrete surface pretreatment:
And (4) polishing the surface of the concrete to be repaired by using sand paper according to the position of the crack, and cleaning the crack by using a high-pressure water gun. And recording the length and width of the permeation crack by adopting a reading microscope and a graduated scale;
12) determining a concrete area to be repaired:
Taking the covering of the crack as a basic requirement, and properly amplifying a repair area according to the field requirement so as to install a repair device;
13) connecting the electrodeposition cathode:
When exposed reinforcing steel bars are arranged on the periphery of the crack, the exposed reinforcing steel bars are directly used as cathodes after an electric communication test, when no exposed reinforcing steel bars are arranged on the periphery of the crack, a reinforcing steel bar detector is used for detecting the position of the nearest transverse main reinforcing steel bar in a concrete area to be repaired, one end of a cable is stretched into the reinforcing steel bar after drilling and is bound and fixed, and after the operation is finished, mortar is used for sealing and pore drilling;
14) Mounting of reference electrode:
When the pre-buried reference electrode is arranged on the site, the pre-buried reference electrode is directly used if no damage is detected, and when the pre-buried reference electrode is not arranged, a new reference electrode is installed after verification, and the installation position is selected to be a position with higher polarization potential;
15) installation of electrolyte carrier and external electrodeposition repair anode:
the electrolyte carrier adopts an externally-hung container, a ruthenium iridium titanium plate is placed in the container as an external electrodeposition repair anode, and glass cement is pre-fixed in the electrolyte carrier and epoxy sealing treatment is carried out;
16) Preparing an electrolyte solution;
17) connection of power supply:
connecting a power supply, a reinforcing steel bar and an anode by using a standard cable, and carrying out insulation sealing treatment on the joint, wherein the voltage intensity is controlled below 36V;
2) the field repair and monitoring method specifically comprises the following steps:
21) before electrochemical deposition repair, electrifying by using a voltage design value of 20%, determining normal operation of each subassembly, and recording corresponding polarization potential through a reference electrode;
22) recording and storing the potential of the reference electrode under normal power-on work;
23) And setting the electrifying time based on that the crack is covered by the sediment.
further, in the step 16), the electrolyte solution is a double-salt electrolyte solution, specifically an electrolyte solution mainly containing precipitated calcium salt and magnesium salt.
Further, the complex salt electrolyte solution is a mixed solution of a magnesium salt solution, a calcium salt solution and sodium bicarbonate, wherein the concentration ratio of the magnesium salt solution to the calcium salt solution is 1-10, the molar concentration of the sodium bicarbonate solution is 10% -50% of the calcium salt concentration, and the calcium salt solution concentration is 0.01-0.1 mol/L.
preferably, the magnesium salt solution can be selected from magnesium chloride or magnesium nitrate solution, and the calcium salt solution can be selected from calcium chloride or calcium nitrate solution.
Further, in the step 22), when the potential of the copper sulfate electrode is lower than-1100 mV, the power is cut off in time to prevent the hydrogen embrittlement effect, and then the voltage is adjusted downwards to continue deposition.
Further, in the step 23), the power-on time is set to be 7-14 days.
compared with the prior art, the invention has the following advantages:
firstly, the electrochemical deposition method is used for repairing concrete cracks of the underground structure, and compared with the traditional repairing method, the method can realize nondestructive repair of the interior of the leakage cracks.
secondly, underground water crack channels become main places of electrodeposition reaction, become unfavorable and favorable, and solve the limitation of the traditional restoration method in water environment.
And thirdly, the current makes harmful ions in the concrete migrate and react with electrolyte heavy ions to precipitate, so that the corrosion of the harmful ions to the reinforcing steel bars is reduced, and the durability of the reinforcing steel bars is ensured.
And fourthly, according to different repairing environments, the type, current density and the like of the electrochemical deposition repairing solution can be adjusted, and the electrodeposition repairing effect is regulated and controlled, so that an ideal repairing result is achieved.
fifthly, monitoring the potential of the steel bar in real time by using a reference electrode in the whole electrodeposition repair process, and monitoring and early warning the corrosion and hydrogen embrittlement effects of the steel bar.
Drawings
FIG. 1 is a schematic diagram of a conventional electrochemical deposition method for repairing a hydraulic structure.
FIG. 2 is a schematic diagram of the in-situ repair of a leaking fracture of a subsurface structure based on electrodeposition in an embodiment.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
the invention provides an underground structure leakage crack on-site repairing device and repairing method based on electrodeposition, aiming at the defects of the current underground structure permeation crack repairing method and combining the concrete crack electrodeposition repairing principle in the marine environment. Compared with the surface treatment technology, the method realizes the crack repair by utilizing the ion migration and deposition reaction, and can effectively realize the internal repair of the micro crack.
as shown in figure 1, the invention provides an underground structure leakage crack on-site repairing device based on electrodeposition, which comprises an adjustable direct current power supply 1, an electrolyte carrier 2, a lead 3, a reference electrode embedding hole 5, a double-salt electrolyte solution 6, a ruthenium-iridium-titanium plate 7 and a steel bar 8. The functions and interconnections of the components are shown in table 1.
TABLE 1 functional description of the components of the field device
the specific process of on-site repair is as follows:
1. Pretreatment for on-site repair
The method comprises the following steps: concrete surface pretreatment
and (4) inspecting the crack position on site, polishing the surface of the concrete to be repaired by using abrasive paper, and cleaning the crack by using a high-pressure water gun. According to engineering requirements, a reading microscope and a graduated scale can be used for recording the length and the width of the penetration crack;
step two: repair area determination
the covering of the crack can be taken as a basic requirement, and the area can be properly enlarged according to the field requirement so as to facilitate the installation of the repairing device;
step three: connection of the electrodeposition cathode
if exposed reinforcing steel bars are arranged around the crack, the exposed reinforcing steel bars can be directly used as cathodes after the electric communication test, if the exposed reinforcing steel bars are not used, the position of the nearest transverse main reinforcing steel bar can be detected by using a reinforcing steel bar detector in a concrete area to be repaired, and one end of a cable is stretched into the reinforcing steel bar after drilling to be bound and fixed. After the operation is finished, sealing the scabbed hole with mortar in time;
Step four: mounting of reference electrode
if the pre-buried reference electrode is arranged on the site, the electrode can be directly used without damage through inspection. If not, the new reference electrode can be installed after being verified, and the installation position can be selected to be a position with a higher polarization potential;
Step five: electrolyte carrier and external anode mounting
The electrolyte carrier can adopt an externally-hung container, and a ruthenium iridium titanium plate anode is placed in the container. Pre-fixing an electrolyte carrier by using glass cement, and sealing by using epoxy;
step six: electrolyte solution preparation
The ion distribution in the seawater is used for reference, and the restoration is carried out through a double-salt electrolyte solution. Mainly an electrolyte solution mainly containing calcium salt and magnesium salt which can generate precipitation. For example, the solution can be a solution comprising magnesium chloride, calcium chloride, sodium bicarbonate and the like, wherein the ratio of the magnesium chloride to the calcium chloride can fluctuate from 1 to 10 according to the field condition, and the sodium bicarbonate solution can be 10% -50% of calcium salt, wherein the concentration of the calcium chloride solution is (0.01-0.1) mol/L;
Step seven: connection of power supply
Connecting a power supply, a reinforcing steel bar and an anode plate by using a standard cable, and carrying out insulation sealing treatment on the joint, wherein the voltage intensity is controlled below 36V;
2. on-site repair process monitoring and effect evaluation
firstly, before electrochemical deposition repair, electrifying by using a voltage design value of 20%, determining that each component assembly normally operates, and recording corresponding polarization potential through a reference electrode.
in the second, normal power-on operation, the reference electrode potential is recorded by the machine. The data is stored every three days and recorded again. For the copper sulfate electrode, if the potential is lower than-1100 mV, the power should be cut off in time to prevent hydrogen embrittlement. The voltage is then adjusted downward to continue deposition.
Thirdly, the electrifying time is 7 to 14 days, and the condition that the crack is covered by the deposit is taken as the standard.
Claims (10)
1. an in-situ electro-deposition based repair device for leaking cracks in underground structures, for repairing structural cracks not exceeding 2mm, the device comprising:
adjustable dc power supply (1): to generate an adjustable weak current;
Electrolyte carrier (2): the electrolytic cell is externally hung at the crack of the damaged underground structure (4) with the crack and used for bearing electrolyte required during electrolysis, and an electrodeposition repair anode (7) is arranged in the electrolyte and is connected with the anode of the adjustable direct current power supply (1) through a lead (3);
Reinforcing steel bar (8): the cathode is arranged in a damaged underground structure (4) with cracks and used as an electrodeposition repair cathode, and is connected with the cathode of an adjustable direct current power supply (1) through a lead (3).
2. An electrodeposition-based in situ repair device for a leaking fracture of a subterranean structure according to claim 1, wherein the electrolyte is a double salt electrolyte solution (6).
3. an electrodeposition-based in-situ repair device for a subterranean structure leakage crack according to claim 1, wherein the electrodeposition repair anode (7) is ruthenium-iridium-titanium plate or graphite.
4. An electrodeposition-based in-situ repair device for a leaking crack of a subterranean structure according to claim 1, wherein the electrolyte carrier (2) is an acrylic basin or gel.
5. the electrodeposition-based in-situ repair device for seepage and cracks of a subsurface structure as claimed in claim 1, wherein a plurality of reference electrode embedding holes (5) for arranging reference electrodes are further formed in the damaged subsurface structure (4) with cracks.
6. An in-situ remediation method using the in-situ electrodeposition-based in-situ leak-off fracture remediation device for a subterranean structure according to any one of claims 1 to 5, comprising the steps of:
1) The pretreatment of on-site repair specifically comprises the following steps:
11) Concrete surface pretreatment:
And (4) polishing the surface of the concrete to be repaired by using sand paper according to the position of the crack, and cleaning the crack by using a high-pressure water gun. And recording the length and width of the permeation crack by adopting a reading microscope and a graduated scale;
12) determining a concrete area to be repaired:
Taking the covering of the crack as a basic requirement, and properly amplifying a repair area according to the field requirement so as to install a repair device;
13) connecting the electrodeposition cathode:
When exposed reinforcing steel bars are arranged on the periphery of the crack, the exposed reinforcing steel bars are directly used as cathodes after an electric communication test, when no exposed reinforcing steel bars are arranged on the periphery of the crack, a reinforcing steel bar detector is used for detecting the position of the nearest transverse main reinforcing steel bar in a concrete area to be repaired, one end of a cable is stretched into the reinforcing steel bar after drilling and is bound and fixed, and after the operation is finished, mortar is used for sealing and pore drilling;
14) Mounting of reference electrode:
when the pre-buried reference electrode is arranged on the site, the pre-buried reference electrode is directly used if no damage is detected, and when the pre-buried reference electrode is not arranged, a new reference electrode is installed after verification, and the installation position is selected to be a position with higher polarization potential;
15) installation of electrolyte carrier and external electrodeposition repair anode:
The electrolyte carrier adopts an externally-hung container, a ruthenium iridium titanium plate is placed in the container as an external electrodeposition repair anode, and glass cement is pre-fixed in the electrolyte carrier and epoxy sealing treatment is carried out;
16) preparing an electrolyte solution;
17) connection of power supply:
connecting a power supply, a reinforcing steel bar and an anode by using a standard cable, and carrying out insulation sealing treatment on the joint, wherein the voltage intensity is controlled below 36V;
2) The field repair and monitoring method specifically comprises the following steps:
21) before electrochemical deposition repair, electrifying by using a voltage design value of 20%, determining normal operation of each subassembly, and recording corresponding polarization potential through a reference electrode;
22) Recording and storing the potential of the reference electrode under normal power-on work;
23) And setting the electrifying time based on that the crack is covered by the sediment.
7. the on-site repair method according to claim 6, wherein in the step 16), the electrolyte solution is a double-salt electrolyte solution, in particular an electrolyte solution mainly containing calcium salt and magnesium salt which generate precipitation.
8. The on-site repair method according to claim 7, wherein the double-salt electrolyte solution is a mixture of a magnesium salt solution, a calcium salt solution and sodium bicarbonate, wherein the concentration ratio of the magnesium salt solution to the calcium salt solution is 1 to 10, the molar concentration of the sodium bicarbonate solution is 10 to 50 percent of the calcium salt concentration, and the calcium salt solution concentration is 0.01 to 0.1 mol/L.
9. the in-situ remediation method of claim 6 wherein in step 22) the power is turned off in time to prevent hydrogen embrittlement when the potential is below-1100 mV for the copper sulfate electrode, and then the voltage is adjusted downward to continue deposition.
10. The field repair method according to claim 6, wherein in the step 23), the power-on time is set to 7 to 14 days.
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| CN111041496A (en) * | 2019-12-16 | 2020-04-21 | 河海大学 | Device and method for controlling chloride ion permeation of reinforced concrete |
| CN111779307A (en) * | 2020-07-10 | 2020-10-16 | 武汉大学 | Reinforced concrete wall nondestructive repair method based on jet erosion |
| CN112982517A (en) * | 2021-02-04 | 2021-06-18 | 同济大学 | Three-electrode system for electrodeposition repair of water seepage crack of underground structure and repair method |
| CN113737231A (en) * | 2021-09-07 | 2021-12-03 | 河海大学 | Electrodeposition liquid for concrete microbial corrosion, preparation method and repair method |
| CN113957938A (en) * | 2021-11-28 | 2022-01-21 | 同济大学 | Hydrogel system for electrodeposition repair of water seepage crack of underground structure and application method thereof |
| CN114075833A (en) * | 2020-08-19 | 2022-02-22 | 福建峻驰工程科技有限公司 | Electric induction seepage-proofing reinforcing method and system |
| CN114686151A (en) * | 2022-03-22 | 2022-07-01 | 同济大学 | Resin colloid repairing material and repairing method of cracking damaged reinforced concrete structure |
| CN115255701A (en) * | 2022-05-17 | 2022-11-01 | 哈尔滨工业大学 | Immersion type electrodeposition welding device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111041496A (en) * | 2019-12-16 | 2020-04-21 | 河海大学 | Device and method for controlling chloride ion permeation of reinforced concrete |
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| CN113737231A (en) * | 2021-09-07 | 2021-12-03 | 河海大学 | Electrodeposition liquid for concrete microbial corrosion, preparation method and repair method |
| CN113957938A (en) * | 2021-11-28 | 2022-01-21 | 同济大学 | Hydrogel system for electrodeposition repair of water seepage crack of underground structure and application method thereof |
| CN114686151A (en) * | 2022-03-22 | 2022-07-01 | 同济大学 | Resin colloid repairing material and repairing method of cracking damaged reinforced concrete structure |
| CN115255701A (en) * | 2022-05-17 | 2022-11-01 | 哈尔滨工业大学 | Immersion type electrodeposition welding device and method |
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