CN114775459A - Coastal concrete reinforcement and monitoring integrated device and method - Google Patents
Coastal concrete reinforcement and monitoring integrated device and method Download PDFInfo
- Publication number
- CN114775459A CN114775459A CN202210342681.4A CN202210342681A CN114775459A CN 114775459 A CN114775459 A CN 114775459A CN 202210342681 A CN202210342681 A CN 202210342681A CN 114775459 A CN114775459 A CN 114775459A
- Authority
- CN
- China
- Prior art keywords
- cfrp
- concrete
- reinforced
- reinforcing
- grids
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012544 monitoring process Methods 0.000 title claims abstract description 19
- 230000002787 reinforcement Effects 0.000 title description 10
- 239000004918 carbon fiber reinforced polymer Substances 0.000 claims abstract description 84
- 230000007246 mechanism Effects 0.000 claims abstract description 71
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 47
- 238000004873 anchoring Methods 0.000 claims abstract description 28
- 230000003628 erosive effect Effects 0.000 claims abstract description 17
- 230000006866 deterioration Effects 0.000 claims abstract description 10
- 238000005507 spraying Methods 0.000 claims abstract description 10
- 238000005266 casting Methods 0.000 claims abstract description 8
- 238000011065 in-situ storage Methods 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- 239000000835 fiber Substances 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 7
- 239000004917 carbon fiber Substances 0.000 claims description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 239000002041 carbon nanotube Substances 0.000 claims description 6
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 6
- 229910021389 graphene Inorganic materials 0.000 claims description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 5
- 239000006004 Quartz sand Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 239000002270 dispersing agent Substances 0.000 claims description 5
- 239000010881 fly ash Substances 0.000 claims description 5
- 238000012806 monitoring device Methods 0.000 claims description 4
- 239000013556 antirust agent Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 239000011216 ultra-high temperature ceramic matrix composite Substances 0.000 claims 4
- 239000011150 reinforced concrete Substances 0.000 description 26
- 230000007797 corrosion Effects 0.000 description 12
- 238000005260 corrosion Methods 0.000 description 12
- 238000006731 degradation reaction Methods 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 7
- 238000004210 cathodic protection Methods 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 239000013535 sea water Substances 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
- -1 Polyethylene Polymers 0.000 description 1
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/06—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against corrosion by soil or water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Analytical Chemistry (AREA)
- Architecture (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a device and a method for reinforcing and monitoring coastal concrete, wherein the device comprises the following components: the device comprises a reinforcing mechanism, a signal tester, an anchoring mechanism and an external direct current power supply mechanism; the reinforcing mechanism comprises a CFRP grid and a conducting layer, and the conducting layer is wrapped on the CFRP grid; the signal tester is electrically connected with the conductive layer; the anchoring mechanisms are arranged at two ends of the conducting layer; and the external direct current power supply mechanism is electrically connected with the CFRP grid and the concrete to be reinforced to form a closed electric loop. The method comprises the following steps: cleaning concrete to be reinforced; fixedly installing anchoring mechanisms at two ends of the tension side surface of the concrete to be reinforced, tensioning the CFRP grids, and spraying or casting a conductive layer in situ to enable the reinforcing mechanisms to be in contact connection with the concrete to be reinforced; installing a signal tester on the conductive layer; the external direct current power supply mechanism is installed so that it forms a closed electrical loop with the reinforcing mechanism and the concrete to be reinforced. By using the invention, the problem of concrete erosion and deterioration in coastal areas is solved practically.
Description
Technical Field
The invention relates to the technical field of coastal erosion concrete structure reinforcement, in particular to a coastal concrete reinforcement and monitoring integrated device and method.
Background
At present, the problem of concrete structure erosion deterioration in coastal areas of China is very serious, and even huge loss is caused to economy of China. Therefore, how to scientifically and reasonably repair and reinforce the reinforced concrete structure in the coastal region becomes a problem which needs to be solved urgently in the domestic development process.
For the erosion deterioration problem of concrete bridges in coastal erosion areas, the following three core problems mainly exist: firstly, the corrosion and durability of the bridge structure are problems, for example, the concrete material of the bridge structure cannot effectively resist the corrosion of seawater and medium; the long-term crack work of the bridge structure and the poor impermeability of the concrete material cause a great amount of seawater and chloride ions to invade the interior of the structure, and the chloride ions invading the interior of the concrete cause the steel bars to be seriously rusted; secondly, the damage degradation problem of the mechanical property of the bridge structure, such as the obvious reduction of the bearing capacity and the rigidity of the bridge structure; and thirdly, the erosion deterioration condition of the bridge structure cannot be effectively monitored and controlled.
However, the existing bridge structure reinforcing technology or reinforcing method is not suitable for repairing and reinforcing the deteriorated bridge structure in the coastal erosion area, for example, the external FRP reinforcing method, the prestressed FRP reinforcing method, the FRP mesh (or grid)/cement-based composite material (or polymer mortar) reinforcing method, and the FRP reinforcing method based on cathodic protection, etc. all cannot simultaneously solve the above three core problems, and only can partially solve the above problems, so it is urgently needed to develop research on the bridge structure reinforcing method in the coastal erosion area.
Therefore, in order to simultaneously solve the three core problems, the invention provides a coastal concrete reinforcing and monitoring integrated device and a method.
Disclosure of Invention
In order to solve the technical problem, a first technical solution adopted by the present scheme is a device for integrating reinforcement and monitoring of coastal concrete, comprising:
the device comprises a reinforcing mechanism, a signal tester, an anchoring mechanism and an external direct current power supply mechanism;
the reinforcing mechanism comprises a CFRP grid and a conductive layer, and the conductive layer wraps the CFRP grid;
the signal measuring instrument is electrically connected with the conductive layer to form a closed electric loop, and the signal measuring instrument is used for measuring the resistance value of the conductive layer;
the anchoring mechanisms are arranged at two ends of the conducting layer and are used for anchoring the CFRP grids and providing prestress for the CFRP grids;
the external direct current power supply mechanism is provided with two electrical connection ends, one electrical connection end is electrically connected with the CFRP grids, and the other electrical connection end is electrically connected with the concrete to be reinforced so as to form a closed circuit.
In one embodiment, the thickness of the CFRP grid is 4-6mm, and the fiber spacing between the longitudinal grid and the transverse grid of the CFRP grid is more than 25 mm.
In one embodiment, the conductive layer is a conductive UHTCC layer, and the conductive UHTCC layer comprises ordinary portland cement, quartz sand, fly ash, water, a high-efficiency water reducing agent, a dispersing agent, PE fibers, chopped carbon fibers, carbon nanotubes, nickel powder and graphene.
In one embodiment, the anchoring mechanism comprises an anchor and a clamp, wherein the anchor is fixedly connected with the clamp;
the anchorage device is fixedly connected with the concrete to be reinforced through bolts and is used for tensioning the CFRP grids and providing prestress;
the anchor clamps are equipped with through hole, screw rod and nut, the screw arrange perpendicularly in the through hole both sides, the two liang of mutual-opposition arrangement of screw, the CFRP net passes through the through hole with the ground tackle is connected, the screw rod passes through the screw is carried the CFRP net, the screw rod passes through the nut is fixed, the anchor clamps centre gripping is fixed the CFRP net.
The second technical scheme adopted by the scheme is that the method for integrating the reinforcement and the monitoring of the coastal concrete comprises the following steps:
s100, cleaning the surface or exposed steel bar of concrete to be reinforced, chiseling loose concrete in a reinforcing area, and polishing and flattening;
s200, installing anchoring mechanisms for tensioning CFRP grids at two ends of the tension side surface of the concrete to be reinforced, then respectively fastening two ends of the CFRP grids in the installed anchoring mechanisms, and spraying or casting a conductive layer in situ to enable the reinforcing mechanisms to be in contact connection with the concrete to be reinforced;
s300, electrically connecting a signal tester with the conductive layer through a lead to form a closed circuit;
s400, connecting the anode of the external direct-current power supply mechanism with the CFRP grid, connecting the cathode of the external direct-current power supply mechanism with a steel bar of the concrete to be reinforced, connecting the steel bar with the CFRP grid through the concrete to be reinforced and the conductive layer, and forming a closed circuit with the external direct-current power supply mechanism.
In one embodiment, step S110 is further included in S100,
and S110, removing rust of the exposed tension steel bars, and coating a steel bar antirust agent outside the exposed tension steel bars after removing the rust.
In one embodiment, step S200 further includes steps S210, S220 and S230, S210, spraying or casting a conductive layer on the tension side of the concrete to be reinforced;
s220, fixing the CFRP grids on the tension side of the concrete to be reinforced through an anchoring mechanism, and applying prestress to the CFRP grids so that one surfaces of the CFRP grids are in complete contact connection with the conductive layer;
and S230, spraying or casting a conducting layer on the other surface of the CFRP grid in a cast-in-place mode to form a reinforcing mechanism.
In one embodiment, the conductive layer is a conductive UHTCC layer, and the conductive UHTCC layer is prepared from ordinary portland cement, quartz sand, fly ash, water, a high-efficiency water reducing agent, a dispersing agent, PE fibers, chopped carbon fibers, carbon nanotubes, nickel powder and graphene.
In one embodiment, the signal measuring instrument is used for measuring the resistance value of the conductive layer, and the measured value is expressed by the formula: r ═ α · ρ · (l/bh);
the alpha is a material property correction coefficient of the conducting layer, the rho is the resistivity of the conducting layer, the l is the length of the conducting layer resistance testing part, the b is the width of the conducting layer resistance testing part, and the h is the thickness of the conducting layer resistance testing part.
In one embodiment, the relationship between the erosion deterioration degree of the conductive layer and the measured value is modeled as: d (n) ═ Rn-R0)/Rn；
The R is0An initial resistance value for which the conductive layer has not undergone erosion deterioration, RnThe resistance value measured for the nth time after the conductive layer is subjected to erosion deterioration.
The invention has the following beneficial effects:
1. according to the integrated device for reinforcing and monitoring the coastal concrete, the CFRP grids and the conductive layer are jointly used as the auxiliary anode and the reinforcing material of the impressed current cathodic protection technology, the device reinforcement and the cathodic protection are integrated into a structural system, the structural repair cost is obviously reduced, and the stability of the protection device is enhanced. In addition, due to the introduction of the prestress, the high-strength characteristic of the CFRP grid is fully exerted, the utilization rate of the CFRP grid strength is obviously improved, the material consumption is reduced, and the repair cost of the structure is reduced again.
2. According to the method for integrating reinforcement and monitoring of the coastal concrete, provided by the invention, the corrosion of the reinforcing steel bars caused by chloride ions which invade into the concrete can be prevented through the impressed current cathodic protection; the signal tester can perform self-monitoring, when the conductive layer is corroded, degraded or damaged, the conductivity of the conductive layer is irreversibly reduced, namely the resistance value of the conductive layer is increased, and the corrosion degradation of the conductive layer is monitored by utilizing the phenomenon, namely the conductive layer has a self-sensing function.
In conclusion, the concrete bridge structure is simple in structure and novel in method, is applied to practical engineering, practically solves three core problems of erosion and degradation of the concrete structure in the coastal area, and has great scientific significance and guiding value for improving the durability of the degraded bridge structure in the coastal erosion area and prolonging the service life of the degraded bridge structure.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of an integrated coastal concrete reinforcing and monitoring device according to the present invention;
fig. 2 is a schematic view of a structure of the clamp provided by the present invention.
The reference numbers are as follows:
10. a reinforcement mechanism; 11. CFRP grids; 12. a conductive UHTCC layer;
20. a signal determinator;
30. an anchoring mechanism; 31. an anchorage device; 311. a bolt; 32. a clamp; 321. a through hole; 322. a screw hole; 323. a screw; 324. a nut;
40. an external DC power supply mechanism;
50. and (5) reinforcing the reinforced concrete beam.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, characteristics and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
The embodiment of the invention provides an integrated device for reinforcing and monitoring coastal concrete, which is shown in fig. 1 and comprises a reinforcing mechanism 10, a signal tester 20, an anchoring mechanism 30 and an external direct-current power supply mechanism 40; the reinforcing mechanism 10 comprises a CFRP grid 11 and a conductive UHTCC layer 12, wherein the conductive UHTCC layer 12 is wrapped on the CFRP grid 11; the signal tester 20 is electrically connected with the conductive UHTCC layer 12 to form a closed electric loop, and the signal tester 20 is used for testing the resistance value of the conductive UHTCC layer 12; the anchoring mechanisms 30 are arranged at two ends of the conductive UHTCC layer 12, and the anchoring mechanisms 30 are used for anchoring the CFRP grids 11 and providing prestress for the CFRP grids 11; the external dc power supply mechanism 40 is provided with two electrical connection terminals, one of which is electrically connected to the CFRP mesh 11 and the other of which is electrically connected to the reinforced concrete beam 50 to be reinforced, so as to form a closed circuit.
It should be noted that the embodiment provided by the present invention is a reinforced concrete beam 50 to be reinforced, the reinforced concrete beam 50 to be reinforced is a structure formed by concrete to be reinforced, and includes other structures with a shape changed by concrete, and the conductive layer is a conductive UHTCC layer 12.
Among them, CFRP (Carbon Fiber Reinforced Plastic) mesh 11 is an integral mesh formed by impregnating Carbon fibers in a resin having good corrosion resistance; the material has the characteristics of low density, high tensile strength, corrosion resistance, fatigue resistance and the like, and can be used as an auxiliary anode of an impressed current cathodic protection technology.
UHTCC (Ultra High Toughness cement Composite, Ultra High tenacity cement-based Composite), UHTCC uses short fiber with the fiber mixing amount not more than 2.5% of the total volume of the Composite to reinforce, and adopts the conventional stirring process to pour, the hardened Composite has obvious strain hardening characteristics, can disperse macroscopic harmful cracks into tiny harmless cracks, and the crack width corresponding to the limit strain can be effectively controlled within 0.1mm, which can be called seamless concrete in a certain sense; super-strong energy absorption capacity; a toughening shear failure characteristic; the steel bar has good deformation coordination; excellent durability and fatigue resistance; the anti-cracking structure can effectively protect the cracking of the structure, improve the impermeability of the structure, effectively prevent the corrosion of harmful ions, greatly improve the durability of the structure and save the engineering operation cost and the maintenance cost to the maximum extent.
The conductive UHTCC layer 12 refers to a UHTCC layer which is prepared by adding chopped carbon fibers, carbon nano tubes, nickel powder and graphene into UHTCC and has conductivity.
The external dc power supply mechanism 40 is a mechanism capable of supplying dc power; the method for providing direct current mainly comprises two modes, one mode is direct current-direct current, and a mechanism for providing direct current is directly used; the other is ac-dc, for example, using a rectifier to convert ac power to dc power.
For example, in the present embodiment, the external dc power supply mechanism 40 is provided as shown in fig. 1, and the reinforcing bars in the reinforced concrete beam 50 to be reinforced, the external dc power supply mechanism 40 and the CFRP mesh 11 are electrically connected in this order by wires, and the wires always output sufficient current or voltage to protect the reinforcing bars.
In order to achieve the effect of this embodiment of the CFRP mesh 11, the CFRP mesh 11 is set to be 4-6mm thick and the CFRP mesh 11 is set to be more than 25mm in the longitudinal and transverse mesh fiber spacing.
Wherein, CFRP net 11 is indulged horizontal net fibre interval and is greater than 25 mm: it means that the spacing between adjacent longitudinal fibers and the spacing between transverse fibers of the CFRP mesh 11 are both greater than 25 mm.
Further, for better gripping of the CFRP mesh 11, the CFRP mesh 11 width may be set to coincide with the width of the anchorage 31.
In order to realize the fixing and tensioning of the CFRP grid 11, the anchoring mechanism 30 is arranged in the embodiment as shown in figures 1 and 2, the anchoring mechanism 30 comprises an anchorage device 31 and a clamp 32, and the anchorage device 31 is fixedly connected with the clamp 32; the anchorage device 31 is fixedly connected with the reinforced concrete beam 50 to be reinforced through a bolt 311, and the anchorage device 31 is used for tensioning the CFRP grid 11 and providing prestress; the fixture 32 is provided with a through hole 321, screw holes 322, a screw 323 and a nut 324, the screw holes 322 are vertically arranged at two sides of the through hole 321, the screw holes 322 are arranged in pairs, the CFRP grids 11 are connected with the anchorage 31 through the through hole 321, the screw 323 clamps the CFRP grids 11 through the screw holes 322, the screw 323 is fixed through the nut 324, and the fixture 32 clamps and fixes the CFRP grids 11.
It should be noted that the anchorage 31, the clamp 32, the screw 323 and the nut 324 are all made of stainless steel materials and remain as permanent components on the surface where the reinforced concrete beam 50 to be reinforced is reinforced.
In application, the CFRP grid 11 is clamped and fixed by the clamp 32 through adjusting the tightness of the screw 323 and the nut 324, the CFRP grid 11 is connected with the anchorage 31 through the through hole 321, and the anchorage 31 stretches the CFRP grid 11 and provides prestress.
The embodiment of the integrated method for reinforcing and monitoring the coastal concrete provided by the invention is as shown in fig. 1 and fig. 2, and comprises the following steps:
s100, cleaning the surface or exposed steel bars of the reinforced concrete beam 50 to be reinforced, chiseling loose concrete in a reinforced area, and polishing and flattening;
specifically, step S110 is further included in S100,
s110, removing rust on the exposed tensioned steel bars, and coating a steel bar antirust agent outside the exposed tensioned steel bars after removing the rust.
S200, installing anchoring mechanisms 30 for tensioning the CFRP grids 11 at two ends of the tension side surface of the reinforced concrete beam 50 to be reinforced, then respectively fastening two ends of the CFRP grids 11 in the installed anchoring mechanisms 30, and spraying or casting a conductive UHTCC (ultra high temperature coefficient of resistance) layer 12 in situ to enable the reinforcing mechanism 10 to be in contact connection with the reinforced concrete beam 50 to be reinforced;
specifically, S200 includes:
s210, spraying or cast-in-place a layer of conductive UHTCC (ultra high temperature coefficient of transmission) layer 12 on the tension side of the reinforced concrete beam 50 to be reinforced;
s220, fixing the CFRP grids 11 on the tension side of the reinforced concrete beam 50 to be reinforced through the anchoring mechanism 30, and applying prestress to the CFRP grids 11 to ensure that one side of the CFRP grids 11 is in complete contact connection with the conductive UHTCC layer 12;
and S230, spraying or casting a conductive UHTCC layer 12 on the other surface of the CFRP grid 11 in a cast-in-place mode to form the reinforcing mechanism 10.
It should be noted that the conductive UHTCC layer 12 is made of ordinary portland cement, quartz sand, fly ash, water, a high-efficiency water reducing agent, a dispersant, PE fibers, chopped carbon fibers, carbon nanotubes, nickel powder, and graphene.
Wherein, PE (Polyethylene) refers to a synthetic fiber spun from ultra-high molecular weight Polyethylene.
When the conductive UHTCC layer 12 is prepared, the proportion and the feeding sequence need to be paid attention to ensure that the conductive UHTCC layer is reliably bonded with the reinforced concrete beam 50 to be reinforced and has good conductive performance, so that the conductive UHTCC layer can be coordinated with the reinforced concrete beam 50 to be reinforced to deform.
It is noted that, in the process of making the reinforcement mechanism 10: firstly, adhering a conductive UHTCC layer 12 on the tension side surface of a reinforced concrete beam 50 to be reinforced; secondly, the CFRP grid 11 is placed tightly on top of the conductive UHTCC layer 12 and lightly compacted to improve its wettability; finally, the CFRP grid 11 is covered with a conductive UHTCC layer 12 and pressed gently to remove air bubbles.
Furthermore, during the process of using the jet or cast-in-place construction, gaps are generated at the positions of some crossing parts which are difficult to be filled, and the gaps at the positions of the CFRP grids 11 can be filled and compacted by trowels.
Specifically, the implementation of S200 may also be in another manner, that is, the CFRP mesh 11 is first tensioned and fixed by the anchoring mechanism 30, then a conductive UHTCC layer 12 is sprayed or cast in situ on both sides of the CFRP mesh 11 according to the size of the region to be reinforced of the reinforced concrete beam 50 to be reinforced, so that the CFRP mesh 11 becomes the reinforcing mechanism 10, and finally the reinforcing mechanism 10 and the reinforced concrete beam 50 to be reinforced are bonded together.
S300, electrically connecting the signal tester 20 with the conductive UHTCC layer 12 through a lead to form a closed circuit;
when the conductive UHTCC layer 12 is corroded, degraded or damaged in application, the conductivity of the conductive UHTCC layer is irreversibly reduced, namely the resistance value of the conductive UHTCC layer is increased, and the corrosion degradation of the conductive UHTCC layer 12 is monitored by utilizing the phenomenon.
Specifically, the signal meter 20 is used to measure the resistance of the conductive UHTCC layer 12, and the measured value is expressed by the formula: r ═ α · ρ · (l/bh); alpha is the material property correction coefficient of the conductive UHTCC layer 12, rho is the resistivity of the conductive UHTCC layer 12, l is the length of the resistance test part of the conductive UHTCC layer 12, b is the width of the resistance test part of the conductive UHTCC layer 12, and h is the thickness of the resistance test part of the conductive UHTCC layer 12.
Still further, the relationship model of the corrosion degradation degree of the conductive UHTCC layer 12 with the measured value is: d (n) ═ Rn-R0)/Rn；R0Initial resistance value, R, for a conductive UHTCC layer 12 not subject to corrosion degradationnThe resistance value measured for the nth time after the conductive UHTCC layer 12 has undergone corrosion degradation.
In addition, the method for measuring the resistance can adopt a two-pole electric method or a four-pole electric method.
S400, connecting the positive pole of the external direct current power supply mechanism 40 with the CFRP grid 11, connecting the negative pole of the external direct current power supply mechanism with the steel bar of the reinforced concrete beam 50 to be reinforced, connecting the steel bar with the CFRP grid 11 through the reinforced concrete beam 50 to be reinforced and the conductive UHTCC layer 12, and forming a closed electric loop with the external direct current power supply mechanism 40.
The CFRP grids 11 and the conductive UHTCC layers 12 are used as current auxiliary anode materials and reinforcing materials, and the reinforcing mechanism 10, the reinforced concrete beam 50 to be reinforced and the external direct-current power supply mechanism 40 are integrated into a structural system, so that the triple effects of simultaneously improving the mechanical property, the durability and the self-perception of the reinforced concrete beam 50 to be reinforced are achieved, namely the CFPR grids 11 and the conductive UHTCC layers 12 improve the bearing capacity and the rigidity of the reinforced concrete beam 50 to be reinforced; the impressed current cathodic protection prevents the reinforcing steel bar from rusting; the conductive UHTCC layer 12 wrapped in the reinforced area of the reinforced concrete beam 50 to be reinforced can effectively protect the original concrete of the reinforced concrete beam 50 to be reinforced from seawater erosion and improve the durability of the reinforced concrete beam 50 to be reinforced; the conductive UHTCC layer 12 has a self-sensing function, when the conductive UHTCC layer 12 is corroded, degraded or damaged, the conductivity of the conductive UHTCC layer is irreversibly reduced, namely the resistance value of the conductive UHTCC layer is increased, and the corrosion degradation of the conductive UHTCC layer 12 is monitored by utilizing the phenomenon, namely the conductive UHTCC layer 12 has the self-sensing function.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An integrated device for reinforcing and monitoring coastal concrete is characterized in that,
the device comprises a reinforcing mechanism, a signal tester, an anchoring mechanism and an external direct-current power supply mechanism;
the reinforcing mechanism comprises a CFRP grid and a conducting layer, and the conducting layer is wrapped on the CFRP grid;
the signal measuring instrument is electrically connected with the conductive layer to form a closed electric loop, and the signal measuring instrument is used for measuring the resistance value of the conductive layer;
the anchoring mechanisms are arranged at two ends of the conducting layer and are used for anchoring the CFRP grids and providing prestress for the CFRP grids;
the external direct-current power supply mechanism is provided with two electrical connection ends, one electrical connection end is electrically connected with the CFRP grid, and the other electrical connection end is electrically connected with the concrete to be reinforced so as to form a closed circuit.
2. The integrated coastal concrete reinforcing and monitoring device according to claim 1,
the thickness of the CFRP grids is 4-6mm, and the fiber spacing between the longitudinal and transverse grids of the CFRP grids is larger than 25 mm.
3. The integrated coastal concrete reinforcing and monitoring device according to claim 1,
the conductive layer is a conductive UHTCC layer, and the conductive UHTCC layer comprises ordinary portland cement, quartz sand, fly ash, water, a high-efficiency water reducing agent, a dispersing agent, PE fibers, chopped carbon fibers, carbon nanotubes, nickel powder and graphene.
4. The integrated coastal concrete reinforcing and monitoring device according to claim 1,
the anchoring mechanism comprises an anchorage device and a clamp, and the anchorage device is fixedly connected with the clamp;
the anchorage device is fixedly connected with the concrete to be reinforced through bolts and is used for tensioning the CFRP grids and providing prestress;
the fixture is provided with a through hole, screw holes, a screw rod and a nut, the screw holes are vertically arranged on two sides of the through hole, the screw holes are arranged in pairs, the CFRP grids are connected with the anchorage device through the through hole, the CFRP grids are clamped by the screw rod through the screw holes, the screw rod is fixed through the nut, and the CFRP grids are clamped and fixed by the fixture.
5. An integrated method for reinforcing and monitoring coastal concrete, characterized in that the device of claim 1 is applied, comprising the following steps:
s100, cleaning the surface or exposed steel bar of concrete to be reinforced, chiseling loose concrete in a reinforced area, and polishing and flattening;
s200, mounting anchoring mechanisms for tensioning CFRP grids at two ends of the tension side surface of the concrete to be reinforced, then respectively fastening two ends of the CFRP grids in the mounted anchoring mechanisms, and spraying or casting a conducting layer in situ to enable the reinforcing mechanisms to be in contact connection with the concrete to be reinforced;
s300, electrically connecting a signal tester with the conductive layer through a lead to form a closed circuit;
s400, connecting the anode of the external direct-current power supply mechanism with the CFRP grid, connecting the cathode of the external direct-current power supply mechanism with a steel bar of the concrete to be reinforced, connecting the steel bar with the CFRP grid through the concrete to be reinforced and the conductive layer, and forming a closed circuit with the external direct-current power supply mechanism.
6. The integrated coastal concrete reinforcing and monitoring method according to claim 5, further comprising a step S110 at S100,
s110, removing rust on the exposed tensioned steel bars, and coating a steel bar antirust agent outside the exposed tensioned steel bars after removing the rust.
7. The integrated coastal concrete reinforcing and monitoring method according to claim 5, further comprising steps S210, S220 and S230 in S200,
s210, spraying or cast-in-place a conductive layer on the tension side of the concrete to be reinforced;
s220, fixing the CFRP grids on the tension side of the concrete to be reinforced through an anchoring mechanism, and applying prestress to the CFRP grids so that one surfaces of the CFRP grids are in complete contact connection with the conductive layer;
and S230, spraying or casting a conducting layer on the other surface of the CFRP grid in a cast-in-place mode to form a reinforcing mechanism.
8. The integrated coastal concrete reinforcing and monitoring method according to claim 5,
the conductive layer is a conductive UHTCC layer, and the conductive UHTCC layer is prepared from ordinary portland cement, quartz sand, fly ash, water, a high-efficiency water reducing agent, a dispersing agent, PE fibers, short carbon fibers, carbon nanotubes, nickel powder and graphene.
9. The integrated coastal concrete reinforcing and monitoring method according to claim 5, wherein,
the signal measuring instrument is used for measuring the resistance value of the conducting layer, and the measured value formula is as follows:
R＝α·ρ·(l/bh)；
the alpha is a material property correction coefficient of the conducting layer, the rho is the resistivity of the conducting layer, the l is the length of the conducting layer resistance testing part, the b is the width of the conducting layer resistance testing part, and the h is the thickness of the conducting layer resistance testing part.
10. The integrated coastal concrete reinforcing and monitoring method according to claim 9,
the relationship model between the erosion deterioration degree of the conductive layer and the measured value is as follows:
D(n)＝(Rn-R0)/Rn；
said R is0An initial resistance value for which the conductive layer has not undergone erosion deterioration, RnThe resistance value measured for the nth time after the conductive layer is subjected to erosion deterioration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210342681.4A CN114775459A (en) | 2022-04-02 | 2022-04-02 | Coastal concrete reinforcement and monitoring integrated device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210342681.4A CN114775459A (en) | 2022-04-02 | 2022-04-02 | Coastal concrete reinforcement and monitoring integrated device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114775459A true CN114775459A (en) | 2022-07-22 |
Family
ID=82426246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210342681.4A Pending CN114775459A (en) | 2022-04-02 | 2022-04-02 | Coastal concrete reinforcement and monitoring integrated device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114775459A (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101149302A (en) * | 2007-11-06 | 2008-03-26 | 哈尔滨工业大学 | Sensor for monitoring/measuring stress/ strain |
| CN102797296A (en) * | 2012-07-13 | 2012-11-28 | 哈尔滨工业大学 | CP anode function and stress self-induction integral intelligent composite material |
| CN102900200A (en) * | 2012-10-09 | 2013-01-30 | 东南大学 | Intelligent FRP (Fiber Reinforce Plastic)-concrete composite structure and manufacturing method thereof |
| CN103833285A (en) * | 2014-03-05 | 2014-06-04 | 江苏高淳陶瓷实业有限公司 | Preparation method of high-intensity photocatalytic cement-based composite slurry and product thereof |
| KR101434523B1 (en) * | 2013-11-29 | 2014-09-05 | (주) 규진건설 | Seismic Retrofitting of Concrete Structures by using Coating Fiber Mesh Grid and Inorganic Cementitious Matrix Composite |
| CN104831288A (en) * | 2015-04-30 | 2015-08-12 | 深圳大学 | Reinforced concrete protection method and system through combination of cathode protection and structure reinforcement |
| CN106830821A (en) * | 2017-01-11 | 2017-06-13 | 上海理工大学 | A kind of fibre-reinforced superhigh tenacity cement-base composite materials of PE and preparation method thereof |
| CN106968455A (en) * | 2017-05-20 | 2017-07-21 | 深圳大学 | The ruggedized construction and reinforcement means of sea sand reinforced beam |
| CN107152171A (en) * | 2017-05-04 | 2017-09-12 | 深圳大学 | A kind of bracing means and reinforcement means with anchor structure |
| CN207032918U (en) * | 2017-05-20 | 2018-02-23 | 深圳大学 | The ruggedized construction of sea sand reinforced beam |
| CN108871180A (en) * | 2018-05-12 | 2018-11-23 | 哈尔滨工业大学 | A kind of unidirectional responsive type cement base strain transducer |
| CN110776291A (en) * | 2019-11-18 | 2020-02-11 | 江苏韧强建筑科技有限公司 | Ultrahigh molecular weight polyethylene fiber reinforced ultrahigh-ductility concrete and preparation method thereof |
| CN111502326A (en) * | 2020-04-30 | 2020-08-07 | 江苏绿材谷新材料科技发展有限公司 | Rapid prestress FRP grid reinforcing method |
| CN111620617A (en) * | 2020-04-24 | 2020-09-04 | 山东大学 | Ultrahigh-performance cement-based composite material for sensor, sensor and preparation method |
| CN112482813A (en) * | 2020-12-03 | 2021-03-12 | 武汉大学 | FRP/ECC permeable bidirectional reinforced concrete bidirectional slab capable of reinforcing damaged steel bar in two directions and preparation method thereof |
-
2022
- 2022-04-02 CN CN202210342681.4A patent/CN114775459A/en active Pending
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101149302A (en) * | 2007-11-06 | 2008-03-26 | 哈尔滨工业大学 | Sensor for monitoring/measuring stress/ strain |
| CN102797296A (en) * | 2012-07-13 | 2012-11-28 | 哈尔滨工业大学 | CP anode function and stress self-induction integral intelligent composite material |
| CN102900200A (en) * | 2012-10-09 | 2013-01-30 | 东南大学 | Intelligent FRP (Fiber Reinforce Plastic)-concrete composite structure and manufacturing method thereof |
| KR101434523B1 (en) * | 2013-11-29 | 2014-09-05 | (주) 규진건설 | Seismic Retrofitting of Concrete Structures by using Coating Fiber Mesh Grid and Inorganic Cementitious Matrix Composite |
| CN103833285A (en) * | 2014-03-05 | 2014-06-04 | 江苏高淳陶瓷实业有限公司 | Preparation method of high-intensity photocatalytic cement-based composite slurry and product thereof |
| CN104831288A (en) * | 2015-04-30 | 2015-08-12 | 深圳大学 | Reinforced concrete protection method and system through combination of cathode protection and structure reinforcement |
| CN106830821A (en) * | 2017-01-11 | 2017-06-13 | 上海理工大学 | A kind of fibre-reinforced superhigh tenacity cement-base composite materials of PE and preparation method thereof |
| CN107152171A (en) * | 2017-05-04 | 2017-09-12 | 深圳大学 | A kind of bracing means and reinforcement means with anchor structure |
| CN106968455A (en) * | 2017-05-20 | 2017-07-21 | 深圳大学 | The ruggedized construction and reinforcement means of sea sand reinforced beam |
| CN207032918U (en) * | 2017-05-20 | 2018-02-23 | 深圳大学 | The ruggedized construction of sea sand reinforced beam |
| CN108871180A (en) * | 2018-05-12 | 2018-11-23 | 哈尔滨工业大学 | A kind of unidirectional responsive type cement base strain transducer |
| CN110776291A (en) * | 2019-11-18 | 2020-02-11 | 江苏韧强建筑科技有限公司 | Ultrahigh molecular weight polyethylene fiber reinforced ultrahigh-ductility concrete and preparation method thereof |
| CN111620617A (en) * | 2020-04-24 | 2020-09-04 | 山东大学 | Ultrahigh-performance cement-based composite material for sensor, sensor and preparation method |
| CN111502326A (en) * | 2020-04-30 | 2020-08-07 | 江苏绿材谷新材料科技发展有限公司 | Rapid prestress FRP grid reinforcing method |
| CN112482813A (en) * | 2020-12-03 | 2021-03-12 | 武汉大学 | FRP/ECC permeable bidirectional reinforced concrete bidirectional slab capable of reinforcing damaged steel bar in two directions and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 陈先华: "《土木工程材料学》", 东南大学出版社, pages: 312 - 317 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Lu et al. | Active and passive protection of steel reinforcement in concrete column using carbon fibre reinforced polymer against corrosion | |
| Zhou et al. | Investigation on the electrochemical and mechanical performance of CFRP and steel-fiber composite bar used for impressed current cathodic protection anode | |
| Wei et al. | Tensile behaviour of carbon fabric reinforced cementitious matrix composites as both strengthening and anode materials | |
| CN102797296B (en) | CP anode function and stress self-induction integral intelligent composite material | |
| Van Nguyen et al. | The performance of carbon fibre composites as iccp anodes for reinforced concrete structures | |
| WO2018201739A1 (en) | Reinforcing device having anchoring structure and reinforcing method | |
| CN103575769A (en) | Piezoelectric sensor for steel-bar corrosion monitoring and steel-bar corrosion monitoring method | |
| CN113089928A (en) | Carbon fiber-FRP-steel bar composite layer grid seawater sea sand concrete laminated slab and manufacturing method thereof | |
| CN114775459A (en) | Coastal concrete reinforcement and monitoring integrated device and method | |
| CN113250517B (en) | Electric power tower composite structure and preparation method thereof | |
| Huang et al. | Bond performance between corroded steel bars and concrete in cathodic protection system with CFRP as anode | |
| CN213389770U (en) | Reinforced structure of concrete beam bridge girder | |
| Dawood | Fundamental behavior of steel-concrete composite beams strengthened with high modulus carbon fiber reinforced polymer (CFRP) materials | |
| CN110467378B (en) | Concrete with structure and corrosion control function integrated | |
| CN114592443A (en) | Device and method for reinforcing coastal erosion concrete | |
| Zuo et al. | Effects of carbon nanotube-carbon fiber cementitious conductive anode for cathodic protection of reinforced concrete | |
| CN215330930U (en) | FRP pipe and steel bar combined ICCP-SS seawater sea sand concrete composite beam | |
| JP2012067360A (en) | Method for fitting electric corrosion-preventive electrode to concrete structure and concrete structure | |
| Wang et al. | Corrosion-induced cracking of recycled aggregate concrete beams under static load | |
| Zhang et al. | Application of CFRP as anode in cathodic protection for steel reinforced concrete–a review | |
| Bhaskar et al. | Effect of corrosion on the bond behavior of OPC and PPC concrete | |
| CN203393616U (en) | Shrinkage-free cement mortar sealing anchor head applied to water conservancy box beam | |
| JPH11200516A (en) | Anticorrosion reinforcing concrete assembly, its anticorrosion method and assembling method | |
| Tian et al. | Investigation on shear performance and prediction model of CFRP-ECC-concrete composite interface suffered from anodic polarization and environmental degradation | |
| Tian et al. | Study on deterioration of mechanical properties and voltage-strength theoretical model of CFRP/conductive ECC composites under coupling effect of anode polarization, load and erosion environment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |