CN110408940B - CFRP-steel concrete combined member cathode protection device and preparation method thereof - Google Patents

CFRP-steel concrete combined member cathode protection device and preparation method thereof Download PDF

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CN110408940B
CN110408940B CN201910862805.XA CN201910862805A CN110408940B CN 110408940 B CN110408940 B CN 110408940B CN 201910862805 A CN201910862805 A CN 201910862805A CN 110408940 B CN110408940 B CN 110408940B
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steel
cfrp
pipe
circular cross
protection device
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CN110408940A (en
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周英武
郑旭彬
邢锋
黄振宇
隋莉莉
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Shenzhen University
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Shenzhen University
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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
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/10—Electrodes characterised by the structure
    • 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
    • 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
    • C23F2201/00—Type of materials to be protected by cathodic protection
    • C23F2201/02—Concrete, e.g. reinforced

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Prevention Of Electric Corrosion (AREA)

Abstract

The invention discloses a cathodic protection device of a CFRP-steel concrete combined member and a preparation method thereof, relating to the technical field of reinforced concrete cathodic protection and mainly comprising the following steps: CFRP pipes, concrete, steel and power supplies; the steel is arranged in the CFRP pipe; the concrete is poured in a gap between the steel and the CFRP pipe; the steel is electrically connected with the negative electrode of the power supply, and the CFRP tube is electrically connected with the positive electrode of the power supply; and when the steel is detected to be corroded, the power supply is started to carry out cathode protection. The cathode protection device for the CFRP-steel concrete combined member and the preparation method thereof can ensure that the electric field of the whole structure is uniformly distributed and improve the durability of the whole structure.

Description

CFRP-steel concrete combined member cathode protection device and preparation method thereof
Technical Field
The invention relates to the technical field of reinforced concrete cathodic protection, in particular to a cathodic protection device of a CFRP-steel concrete combined member and a preparation method thereof.
Background
The most common cathodic protection method at present is a cathodic protection device using Carbon Fiber Reinforced Polymer/Plastic (CFRP) longitudinal bars as anodes, and the cathodic protection device comprises the following components: the anode is a CFRP longitudinal bar, the cathode is a common steel bar, the CFRP longitudinal bar is connected with the anode of the power supply through applying current by an external power supply, and the steel bar is connected with the cathode of the power supply. The structure utilizes a cathodic protection method to protect the reinforcing steel bars from corrosion, improves the utilization rate of materials, fully exerts the corrosion resistance, low consumption rate, long service life, durability, enough mechanical strength, high reliability and other mechanical properties of the CFRP longitudinal bars, and greatly improves the long-term performance of the beam.
The other cathodic protection method is a cathodic protection device which takes CFRP-steel composite bars as an anode and a cathode for self-protection. For a single CFRP-steel composite bar, a protective layer outside the composite bar serves as an anode of a cathode protection circuit, a common steel bar serving as a bar inner core inside the composite bar serves as a cathode in the cathode protection circuit, the protective layer is electrically connected with a positive pole of a direct current power supply, and the common steel bar inner core is electrically connected with a negative pole of the direct current power supply to form the cathode protection circuit. For a reinforced concrete structure taking CFRP-steel composite bars as stress bars, protective layers of the CFRP-steel composite bars in the reinforced concrete structure are electrically connected to serve as an anode system of a cathode protection circuit, common steel bars in the CFRP-steel composite bars serving as inner cores are electrically connected to serve as a cathode system of the cathode protection circuit, and the CFRP-steel composite bars are self-protected. The method has the advantages of convenient construction, greatly reduced construction amount, multiple purposes of one rib, improved material utilization rate, less electric energy consumption in use and obvious economic benefit.
The main defects of the above technologies are that the CFRP bars and the steel bars are arranged alternately, and the electric field of the whole structure is influenced mutually, so that the electric field cannot be uniformly distributed, and the durability of the structure is different, thereby influencing the whole structure. Meanwhile, since a reinforced concrete structure, that is, a column structure, is a structure for resisting compression, it needs to bear a load given to it from an end, and if the column structure is improperly designed, a bearing capacity problem occurs, thereby affecting the durability of the structure. The CFRP rib is a rib material with high tensile strength and low compressive strength, and is used for the column structure, which greatly wastes materials and can seriously affect the characteristics of the column structure such as bearing capacity and the like. Therefore, the conventional cathodic protection method is difficult to be applied to a column structure, and the ductility, the bearing capacity and other properties of concrete cannot be guaranteed.
Disclosure of Invention
The invention aims to provide a cathode protection device of a CFRP-steel concrete combined member and a preparation method thereof, which can ensure that the electric field of the whole structure is uniformly distributed and improve the durability of the whole structure.
In order to achieve the purpose, the invention provides the following scheme:
a CFRP-steel concrete combined member cathode protection device comprises a CFRP pipe, concrete, steel and a power supply;
the steel is arranged in the CFRP pipe;
the concrete is poured in a gap between the steel and the CFRP pipe;
the steel is electrically connected with the negative electrode of the power supply, and the CFRP tube is electrically connected with the positive electrode of the power supply; and judging the corrosion condition of the steel by detecting the potential of the steel, and starting the power supply to perform timely cathode protection when the steel is detected to start to be corroded.
Optionally, the CFRP pipe is a CFRP pipe having a circular cross-sectional shape or a CFRP pipe having a square cross-sectional shape.
Optionally, the steel material is a steel pipe with a circular single cross section, a plurality of steel pipes with a circular cross section, a steel pipe with a square single cross section, a single i-steel, a single channel steel, a solid steel pipe with a circular single cross section, a combination steel of a single i-steel and a plurality of steel bars, or a combination steel of a solid steel pipe with a circular single cross section and a plurality of steel bars.
Optionally, when the steel is a plurality of steel pipes with circular cross sections, the outer walls of every two adjacent steel pipes with circular cross sections are bonded together by a bonding material containing conductive particles, and the plurality of steel pipes with circular cross sections are bonded into a whole.
Optionally, when the steel is a combined steel of a single i-steel and a plurality of steel bars, the plurality of steel bars are uniformly distributed around the single i-steel in a circle shape, and the distance between each steel bar of the same circle and the CFRP pipe is equal.
Optionally, when the steel is a composite steel of a single solid steel pipe with a circular cross section and a plurality of steel bars, the plurality of steel bars are uniformly distributed around the solid steel pipe with a circular cross section, and the distance between each steel bar of the same circle and the CFRP pipe is equal.
In order to achieve the above purpose, the invention also provides the following scheme:
a preparation method of a cathode protection device of a CFRP-steel concrete combined member comprises the following steps:
manufacturing the CFRP pipe according to the expected size of the CFRP pipe;
manufacturing steel materials according to the expected size and the expected quantity of the steel materials;
fixing the steel material in the middle of the CFRP pipe;
pouring concrete in a gap between the steel and the CFRP pipe, and vibrating;
and electrically connecting the negative electrode of the power supply with the steel, and electrically connecting the positive electrode of the power supply with the CFRP pipe.
Optionally, the manufacturing of the steel material according to the expected size and the expected number of the steel material specifically includes:
precisely processing the steel by using a lathe to manufacture the steel with expected size and quantity; when the manufactured steel is a plurality of steel pipes with circular cross sections, the outer walls of every two adjacent steel pipes with circular cross sections are bonded together through a bonding material containing conductive particles, so that the plurality of steel pipes with circular cross sections are bonded into a whole.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a cathode protection device of a CFRP-steel concrete combined member and a preparation method thereof.A CFRP pipe at an outer ring is used as an anode, an internal steel material is used as a cathode, protection is exerted by an external power supply, the corrosion condition of the steel material is judged by detecting the potential of the steel material, and when the corrosion of the internal steel material is detected, the power supply is started for timely cathode protection, so that the CFRP pipe can fully exert the unique mechanical advantage thereof. Meanwhile, the CFRP pipes can be completely and uniformly arranged in the CFRP-steel concrete combined member by utilizing the characteristic of the outer ring, and because the relative positions of the cathode and the anode are completely consistent, the structure has no electric field cross influence caused by a plurality of anode cathodes, so that the electric field of the whole structure is sufficiently and uniformly distributed, and the durability of the whole structure and the stability of a circuit are improved.
In addition, the CFRP pipe can be used as a CFRP-steel concrete combined member reinforcing material and an anode material, is multipurpose, improves the material utilization rate, protects internal steel products from being corroded, and greatly improves the bearing capacity and the concrete ductility.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, 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 to obtain other drawings without inventive exercise.
FIG. 1 is a side view of a cathodic protection device for a CFRP-steel reinforced concrete composite member according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a cathodic protection device for a CFRP-steel reinforced concrete composite member according to an embodiment of the present invention;
FIG. 3 is a side view of a cathodic protection device for a CFRP-steel reinforced concrete composite member according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a cathodic protection device of a CFRP-steel reinforced concrete composite member according to an embodiment of the present invention;
FIG. 5 is a side view of a cathodic protection device for a three CFRP-steel reinforced concrete composite member according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view of a cathodic protection device for three CFRP-steel reinforced concrete composite members according to an embodiment of the present invention;
FIG. 7 is a side view of a cathodic protection device for a four CFRP-steel concrete composite member according to an embodiment of the present invention;
FIG. 8 is a cross-sectional view of a cathodic protection device for four CFRP-steel reinforced concrete composite members in accordance with an embodiment of the present invention;
FIG. 9 is a side view of a cathodic protection device for a five CFRP-steel concrete composite member in accordance with an embodiment of the present invention;
FIG. 10 is a cross-sectional view of a cathodic protection device for a five CFRP-steel reinforced concrete composite member in accordance with an embodiment of the present invention;
FIG. 11 is a side view of a cathodic protection device for a six CFRP-steel concrete composite member in accordance with an embodiment of the present invention;
FIG. 12 is a cross-sectional view of a cathodic protection device for a six CFRP-steel concrete composite member in accordance with an embodiment of the present invention;
FIG. 13 is a side view of a cathodic protection device for a seven CFRP-steel concrete composite member in accordance with an embodiment of the present invention;
FIG. 14 is a cross-sectional view of a cathodic protection device for a seven CFRP-steel concrete composite member in accordance with an embodiment of the present invention;
FIG. 15 is a side view of the cathodic protection device of an eight CFRP-steel reinforced concrete composite member of an embodiment of the present invention;
FIG. 16 is a cross-sectional view of a cathodic protection device of an eight CFRP-steel reinforced concrete composite member according to an embodiment of the present invention;
FIG. 17 is a side view of a cathodic protection device for a nine CFRP-steel concrete composite member in accordance with an embodiment of the present invention;
FIG. 18 is a cross-sectional view of a cathodic protection device for a nine CFRP-steel reinforced concrete composite member in accordance with an embodiment of the present invention;
FIG. 19 is a flow chart of an embodiment of a method for manufacturing a cathodic protection device for a CFRP-steel concrete composite member according to the present invention;
FIG. 20 is a schematic view of the most common cathodic protection method;
fig. 21 is a schematic view of another cathodic protection method, which is most common today.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a cathode protection device of a CFRP-steel concrete combined member and a preparation method thereof, which can ensure that the electric field of the whole structure is uniformly distributed and improve the durability of the whole structure.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Example one
FIG. 1 is a side view of a cathodic protection device for a CFRP-steel reinforced concrete composite member according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a cathodic protection device for a CFRP-steel reinforced concrete composite member according to an embodiment of the present invention. Referring to fig. 1 and 2, the CFRP-steel reinforced concrete composite member cathode protection device is a cathode protection device of a single-tube hollow cylindrical structure, and includes a CFRP tube 101 having a circular sectional shape, concrete 102, a single steel tube 103 having a circular sectional shape, and a power supply 104.
A single steel pipe 103 having a circular sectional shape is provided in the CFRP pipe 101 having a circular sectional shape.
Concrete 102 is poured into the gap between the single steel pipe 103 having a circular cross-sectional shape and the CFRP pipe 101 having a circular cross-sectional shape.
The single steel pipe 103 with the circular cross section is electrically connected with the negative electrode of the power supply 104, and the CFRP pipe 101 with the circular cross section is electrically connected with the positive electrode of the power supply 104; the corrosion condition of the steel pipe 103 with the circular cross section is judged by detecting the potential of the steel pipe 103 with the circular cross section, and when the steel pipe 103 with the circular cross section starts to be corroded, the power supply 104 is turned on to carry out cathode protection at proper time.
Example two
FIG. 3 is a side view of the cathodic protection device of the CFRP-steel reinforced concrete composite member according to the embodiment of the present invention. FIG. 4 is a cross-sectional view of a cathodic protection device for a CFRP-steel reinforced concrete composite member according to an embodiment of the present invention. Referring to fig. 3 and 4, the CFRP-steel concrete composite member cathodic protection device is a cathodic protection device of a multi-tube hollow cylindrical structure, which includes a CFRP tube 101 having a circular sectional shape, concrete 102, a plurality of steel tubes 103 having a circular sectional shape, and a power supply 104.
The outer walls of every two adjacent steel pipes 103 with circular cross sections are bonded together through bonding materials, and a plurality of steel pipes 103 with circular cross sections are bonded into a whole. Wherein the adhesive material is an adhesive material containing conductive particles.
A plurality of steel pipes 103 having a circular cross-sectional shape are provided in the CFRP pipe 101 having a circular cross-sectional shape.
The concrete is poured into gaps between the plurality of steel pipes 103 having a circular cross-sectional shape and the CFRP pipes 101 having a circular cross-sectional shape.
The plurality of steel pipes 103 with the circular cross section are electrically connected with the negative electrode of the power supply 104 through one steel pipe 103 with the circular cross section, and the CFRP pipe 101 with the circular cross section is electrically connected with the positive electrode of the power supply 104; the corrosion condition of the steel pipe 103 with the circular cross section is judged by detecting the potential of the steel pipe 103 with the circular cross section, and when the steel pipe 103 with the circular cross section starts to be corroded, the power supply 104 is turned on to carry out cathode protection at proper time.
EXAMPLE III
FIG. 5 is a side view of the cathodic protection device of three CFRP-steel reinforced concrete composite members of the embodiment of the invention. FIG. 6 is a cross-sectional view of a cathodic protection device for three CFRP-steel reinforced concrete composite members according to an embodiment of the present invention. Referring to fig. 5 and 6, the CFRP-steel concrete composite member cathode protection device is a cathode protection device of a square tube hollow cylindrical structure, and includes a CFRP tube 101 having a circular cross-sectional shape, concrete 102, a single steel tube 203 having a square cross-sectional shape, and a power supply 104.
A single steel pipe 203 having a square cross-sectional shape is disposed in the CFRP pipe 101 having a circular cross-sectional shape.
Concrete 102 is poured into the gap between the single steel pipe 203 having a square cross-sectional shape and the CFRP pipe 101 having a circular cross-sectional shape.
The single steel pipe 203 with the square cross section is electrically connected with the negative electrode of the power supply 104, and the CFRP pipe 101 with the circular cross section is electrically connected with the positive electrode of the power supply 104; the corrosion condition of the steel pipe 203 with the square cross section is judged by detecting the potential of the steel pipe 203 with the square cross section, and when the steel pipe 203 with the square cross section starts to be corroded, the power supply 104 is turned on to carry out cathode protection in due time.
Example four
FIG. 7 is a side view of a cathodic protection device for a four CFRP-steel concrete composite member in accordance with an embodiment of the present invention. FIG. 8 is a cross-sectional view of a cathodic protection device for four CFRP-steel reinforced concrete composite members in accordance with an embodiment of the present invention. Referring to fig. 7 and 8, the CFRP-steel concrete composite member cathodic protection device is a cathodic protection device of an i-shaped steel cylindrical structure, which includes a CFRP pipe 101 having a circular cross-sectional shape, concrete 102, a single i-shaped steel 303, and a power source 104.
A single i-steel 303 is disposed in the CFRP pipe 101 having a circular cross-sectional shape.
Concrete 102 is poured in the gap between the single i-steel 303 and the CFRP pipe 101 having a circular cross-sectional shape.
The single I-shaped steel 303 is electrically connected with the negative pole of the power supply 104, and the CFRP pipe 101 with the circular cross section is electrically connected with the positive pole of the power supply 104; the corrosion condition of the I-beam 303 is judged by detecting the potential of the I-beam 303, and when the I-beam 303 is detected to start to be corroded, the power supply 104 is turned on for timely cathode protection.
EXAMPLE five
FIG. 9 is a side view of a cathodic protection device for a five CFRP-steel concrete composite member in accordance with an embodiment of the present invention. FIG. 10 is a cross-sectional view of a cathodic protection device for a five CFRP-steel reinforced concrete composite member in accordance with an embodiment of the present invention. Referring to fig. 9 and 10, the CFRP-steel concrete composite member cathodic protection device is a cathodic protection device of a channel steel cylindrical structure, which includes a CFRP pipe 101 having a circular cross-sectional shape, concrete 102, a single channel steel 403, and a power supply 104.
A single channel 403 is provided in the CFRP pipe 101 having a circular cross-sectional shape.
Concrete 102 is poured into the void between the individual channels 403 and the CFRP pipe 101, which is circular in cross-sectional shape.
The single channel steel 403 is electrically connected with the negative electrode of the power supply 104, and the CFRP tube 101 with the circular cross section is electrically connected with the positive electrode of the power supply 104; the corrosion condition of the channel steel 403 is judged by detecting the potential of the channel steel 403, and when the channel steel 403 starts to be corroded, the power supply 104 is turned on for timely cathode protection.
EXAMPLE six
FIG. 11 is a side view of a cathodic protection device for a six CFRP-steel concrete composite member in accordance with an embodiment of the present invention. FIG. 12 is a cross-sectional view of a cathodic protection device for a six CFRP-steel reinforced concrete composite member in accordance with an embodiment of the present invention. Referring to fig. 11 and 12, the CFRP-steel concrete composite member cathodic protection device is a cathodic protection device of a single-tube solid cylindrical structure, which includes a CFRP tube 101 having a circular sectional shape, concrete 102, a single solid steel tube 503 having a circular sectional shape, and a power supply 104.
A single solid steel pipe 503 having a circular sectional shape is disposed in the CFRP pipe 101 having a circular sectional shape.
Concrete 102 is poured into the gap between the single solid steel pipe 503 having a circular cross-sectional shape and the CFRP pipe 101 having a circular cross-sectional shape.
The single solid steel pipe 503 with the circular cross section is electrically connected with the negative electrode of the power supply 104, and the CFRP pipe 101 with the circular cross section is electrically connected with the positive electrode of the power supply 104; the corrosion condition of the solid steel pipe 503 with the circular cross section is judged by detecting the potential of the solid steel pipe 503 with the circular cross section, and when the solid steel pipe 503 with the circular cross section starts to be corroded, the power supply 104 is turned on to carry out cathode protection in due time.
EXAMPLE seven
FIG. 13 is a side view of a cathodic protection device for a seven CFRP-steel concrete composite member in accordance with an embodiment of the present invention. FIG. 14 is a cross-sectional view of a cathodic protection device for a seven CFRP-steel reinforced concrete composite member in accordance with an embodiment of the present invention. Referring to fig. 13 and 14, the CFRP-steel concrete composite member cathodic protection device is a type of steel section-steel reinforcement composite cylindrical structure cathodic protection device, which includes a CFRP pipe 101 having a circular sectional shape, concrete 102, a composite steel of a single i-steel 303 and a plurality of steel reinforcements 603, and a power supply 104.
A single i-beam 303 and a composite steel of a plurality of reinforcing bars 603 are disposed in the CFRP pipe 101 having a circular sectional shape.
Concrete 102 is poured in a gap between a combination steel of a single i-steel 303 and a plurality of reinforcing bars 603 and the CFRP pipe 101 having a circular sectional shape.
The combined steel of the single I-shaped steel 303 and the plurality of steel bars 603 is electrically connected with the negative pole of the power supply 104 through the I-shaped steel 303 and each steel bar 603, and the CFRP pipe 101 with the circular section is electrically connected with the positive pole of the power supply 104; the corrosion condition of the I-beam 303 or the steel bar 603 is judged by detecting the potential of the I-beam 303 or the steel bar 603, and when the I-beam 303 or the steel bar 603 is detected to start to be corroded, the power supply 104 is started to carry out timely cathode protection.
Example eight
FIG. 15 is a side view of the cathodic protection device of the eight CFRP-steel reinforced concrete composite member of the embodiment of the present invention. FIG. 16 is a cross-sectional view of a cathodic protection device of an eight CFRP-steel reinforced concrete composite member according to an embodiment of the present invention. Referring to fig. 15 and 16, the CFRP-steel concrete composite member cathodic protection device is a cathodic protection device of a steel pipe-steel reinforcement combined cylindrical structure, which includes a CFRP pipe 101 having a circular sectional shape, concrete 102, a single solid steel pipe 503 having a circular sectional shape, and a combined steel of a plurality of steel reinforcements 603, and a power supply 104.
A single solid steel pipe 503 having a circular sectional shape and a combined steel of a plurality of reinforcing bars 603 are disposed in the CFRP pipe 101 having a circular sectional shape.
Concrete 102 is poured in the gap between the single solid steel pipe 503 having a circular cross-sectional shape and the combined steel of the plurality of reinforcing bars 603 and the CFRP pipe 101 having a circular cross-sectional shape.
The combined steel of the single solid steel pipe 503 with the circular cross section and the plurality of steel bars 603 is electrically connected with the negative electrode of the power supply 104 through the solid steel pipe 503 with the circular cross section and each steel bar 603, and the CFRP pipe 101 with the circular cross section is electrically connected with the positive electrode of the power supply 104; the corrosion condition of the solid steel pipe 503 or the steel bar 603 with the circular cross section is judged by detecting the potential of the solid steel pipe 503 or the steel bar 603 with the circular cross section, and when the solid steel pipe 503 or the steel bar 603 with the circular cross section is detected to start to be corroded, the power supply 104 is turned on to carry out timely cathode protection.
Example nine
FIG. 17 is a side view of a cathodic protection device for a nine CFRP-steel concrete composite member in accordance with an embodiment of the present invention. FIG. 18 is a cross-sectional view of a cathodic protection device of a nine CFRP-steel reinforced concrete composite member in accordance with an embodiment of the present invention. Referring to fig. 17 and 18, the CFRP-steel concrete composite member cathode protection device is a cathode protection device of a single-tube hollow square column structure, and includes a CFRP tube 201 having a square cross-sectional shape, concrete 102, a single steel tube 103 having a circular cross-sectional shape, and a power supply 104.
A single steel pipe 103 having a circular cross-sectional shape is disposed in a CFRP pipe 201 having a square cross-sectional shape.
Concrete 102 is poured into the gap between the single steel pipe 103 having a circular cross-sectional shape and the CFRP pipe 201 having a square cross-sectional shape.
The single steel pipe 103 with the circular cross section is electrically connected with the negative electrode of the power supply 104, and the CFRP pipe 201 with the square cross section is electrically connected with the positive electrode of the power supply 104; the corrosion condition of the steel pipe 103 with the circular cross section is judged by detecting the potential of the steel pipe 103 with the circular cross section, and when the steel pipe 103 with the circular cross section starts to be corroded, the power supply 104 is turned on to carry out cathode protection at proper time.
The cathode protection device of the CFRP-steel concrete combined member disclosed by the invention has a very wide application range, and can be applied to CFRP-steel combined members in various forms, and each CFRP-steel concrete combined member comprises concrete, steel embedded in the concrete and an outer ring CFRP pipe combination. Concrete medium is arranged between the outer ring CFRP pipe and the inner steel, the inner steel is used as a cathode and is connected with a negative pole of a direct current power supply, the outer ring CFRP pipe is used as an anode and is connected with a positive pole of the direct current power supply. The CFRP-steel concrete combined member does not have the electric field cross influence caused by a plurality of anode cathodes, the electric field of the whole structure is sufficiently and uniformly distributed, even if the CFRP-steel concrete combined member is of a multi-tube structure, the whole electric field can still be understood as the same, and because the relative positions of the cathodes and the anodes are completely consistent, the uniformly distributed electric field overcomes the durability problem of the structure. The CFRP pipe electrically connected with the positive electrode of the direct current power supply serves as an anode system in a circuit, so that steel is protected from corrosion, and the effect of cathodic protection is achieved. The CFRP pipe is combined with a structure (steel concrete combination) into a whole through a conductive bonding material, so that the ductility of the concrete is greatly improved, and the shear-resistant bearing capacity and the rigidity of the column structure are ensured. The CFRP pipe replaces an anode material which is additionally added when cathode protection is applied, so that the CFRP pipe is multipurpose, the use amount of the material is reduced, and the engineering cost is reduced. The CFRP tubes are uniformly distributed in the structure, so that the electric field of the whole circuit is more uniform, and the cathode protection effect is more reliable. The CFRP pipe has the advantages that the CFRP pipe is formed by winding CFRP fibers, and the CFRP material has excellent tensile property, so that the CFRP pipe can hoop concrete of a column structure when the column structure bears load, crack development can be delayed when the concrete begins to break, the ductility of the concrete is ensured, and the bearing capacity and the durability of the column structure can be obviously improved. The cathodic protection device can be used for newly-built reinforced concrete structures in erosion environments, is directly installed on the structure in the prefabrication process of concrete pouring components, is convenient in cathode and anode arrangement, wiring and the like, does not need secondary operation, and has the advantages of construction flexibility, better mechanical property and the like.
In addition, the cathode protection device of the CFRP-steel concrete combined member disclosed by the invention has a timely cathode protection function. The integral combined component can be opened and closed at proper time for cathode protection, and when the steel is detected to start to be rusted, the cathode protection is opened again, so that the method for preventing the steel from being rusted can be actively controlled by human subjectivity, the integral system can be more flexible, and meanwhile, the energy can be saved. Turning off the cathodic protection only requires turning off the external power supply. The method for detecting the corrosion of the steel can adopt a reference electrode to detect the potential recognition of the steel.
Example ten
FIG. 19 is a flow chart of an embodiment of a method for manufacturing a cathodic protection device for a CFRP-steel reinforced concrete composite member according to the present invention. Referring to fig. 19, the method for preparing the cathode protection device of the CFRP-steel reinforced concrete composite member includes:
step 1901: the CFRP pipe is fabricated according to the desired dimensions of the CFRP pipe.
The CFRP pipe is factory pre-fabricated and manufactured according to the desired dimensions of the CFRP pipe. The CFRP pipe is a CFRP pipe with a circular cross section or a CFRP pipe with a square cross section.
Step 1902: the steel is manufactured according to the expected size and the expected quantity of the steel.
The steel material is a steel pipe with a round single section, a plurality of steel pipes with round cross sections, a steel pipe with a square single section, a single I-shaped steel, a single channel steel, a solid steel pipe with a round single section, a combined steel of a single I-shaped steel and a plurality of steel bars, or a combined steel of a solid steel pipe with a round single section and a plurality of steel bars.
The steel material is precisely machined by a lathe to produce a steel material of a desired size and a desired number.
When the manufactured steel is a steel pipe with a single circular cross section, a small hole is chiseled on the steel pipe, and a lead is led out.
When the manufactured steel is a plurality of steel pipes with circular cross sections, the outer walls of every two adjacent steel pipes with circular cross sections are bonded together through a bonding material containing conductive particles, so that the plurality of steel pipes with circular cross sections are bonded into a whole. A small hole is chiseled on the whole, namely a small hole is chiseled on one of the steel pipes with the circular cross section, and then a lead is led out.
When the manufactured steel is a steel pipe with a single square cross section, a small hole is chiseled on the steel pipe, and a lead is led out.
When the manufactured steel is a single I-shaped steel, a small hole is chiseled on the I-shaped steel, and a lead is led out.
When the manufactured steel is a single channel steel, a small hole is drilled in the channel steel, and a lead is led out.
When the manufactured steel is a solid steel pipe with a single circular section, a small hole is chiseled on the solid steel pipe, and a lead is led out.
When the manufactured steel is combined steel of a single I-shaped steel and a plurality of steel bars, the plurality of steel bars are uniformly distributed around the single I-shaped steel in a circle shape, and the distance between each steel bar of the same circle and the CFRP pipe with the circular cross section is equal. A small hole is chiseled on the I-shaped steel, a lead is led out, a small hole is chiseled on each reinforcing steel bar, and a corresponding lead is led out.
When the manufactured steel is the combined steel of a single solid steel pipe with a circular cross section and a plurality of steel bars, the plurality of steel bars are uniformly distributed around the solid steel pipe with the circular cross section in a circle shape, and the distances between the steel bars in the same circle and the CFRP pipe with the circular cross section are equal. And chiseling a small hole on the solid steel pipe, leading out a lead, chiseling a small hole on each reinforcing steel bar, and leading out a corresponding lead.
Step 1903: and fixing the steel material in the middle of the CFRP pipe.
Step 1904: and pouring concrete in a gap between the steel and the CFRP pipe, and vibrating.
Therefore, after the CFRP-steel reinforced concrete combined member is manufactured, the steel and the conducting wire of the CFRP pipe are also led out, the outer ring CFRP pipe used by the CFRP-steel reinforced concrete combined member can be electrically connected with the positive pole of the direct current power supply through the conducting wire, and the inner steel is electrically connected with the negative pole of the direct current power supply.
Step 1905: and electrically connecting the negative electrode of the power supply with the steel, and electrically connecting the positive electrode of the power supply with the CFRP pipe.
In nature, elementary substance iron is in an unstable state and has a tendency of converting iron oxide with lower energy and more stable form, the oxidation reaction of steel is a process of releasing electrons, and if the steel is in a cathode polarization state, the electrons of the steel are extremely rich and cannot be lost, so that the oxidation reaction cannot be generated. After the energization, the internal steel material as the cathode undergoes a reduction reaction: 2H++2e→H2And the outer ring CFRP pipe as the anode is subjected to oxidation reaction: 2H2O→O2+4H++4e and 2Cl—→Cl2+2 e. The charge electrons flow from the DC power supply to the cathode electrode of the internal steel material through the lead, so that the cathode of the steel material is polarized, and the oxidation reaction of the steel material is inhibited. The cathode protection device for the CFRP-steel concrete combined member disclosed by the invention can enable steel to be polarized in a cathode mode, when the steel is in the cathode polarization state, a large number of negatively charged electrons are arranged near the steel, and due to the principle that like charges repel each other and opposite polarities attract each other, chloride ions can migrate towards the direction far away from the steel, so that a passive film of the steel cannot be damaged, and the steel cannot be corroded. Therefore, the cathode protection device for the CFRP-steel concrete combined member disclosed by the invention can realize that chloride ions move towards the direction far away from the common steel bar (steel) under the action of an electric field, so that the concentration of the chloride ions around the common steel bar is reduced, and the protection effect is provided for the common steel bar.
Fig. 20 is a schematic view of the most common cathodic protection method now. Referring to fig. 20, the most common cathode protection method is a cathode protection device using CFRP longitudinal bars as anodes, and the cathode protection device comprises: the anode is CFRP longitudinal bar 1, the cathode is common steel bar 2, and the CFRP bar is connected with the anode of the power supply and the steel bar is connected with the cathode of the power supply by applying current through an external power supply.
Fig. 21 is a schematic view of another cathodic protection method, which is most common today. Referring to fig. 21, another cathodic protection method most commonly used today is a cathodic protection device that is self-protected with CFRP-steel composite bars as the anode and cathode. For a single CFRP-steel composite bar, the protective layer 3 outside the composite bar is used as the anode of a cathode protection circuit, the common steel bar 4 inside the composite bar, which is used as the inner core of the bar material, is used as the cathode in the cathode protection circuit, the protective layer 3 is electrically connected with the anode of a direct current power supply, and the inner core of the common steel bar 4 is electrically connected with the cathode of the direct current power supply, so that the cathode protection circuit is formed. For a reinforced concrete structure 5 taking CFRP-steel composite bars as stress bars, protective layers 3 of the CFRP-steel composite bars in the reinforced concrete structure 5 are electrically connected to serve as an anode system of a cathode protection circuit, common steel bars 4 serving as inner cores in the CFRP-steel composite bars are electrically connected to serve as a cathode system of the cathode protection circuit, and the CFRP-steel composite bars are subjected to self-protection.
The most common cathodic protection method at present has the main disadvantages that CFRP bars and reinforcing steel bars are alternately arranged, and the uniformity of an electric field of the whole structure is not enough. Meanwhile, the technology is difficult to be applied to a column structure, and the performances of concrete such as ductility, bearing capacity and the like cannot be guaranteed.
Compared with the most common cathodic protection method at present, the invention provides a cathodic protection device and method (cathodic protection form) of a combined structure, which has the advantages of convenient construction, excellent corrosion resistance, and greatly improved concrete compressive strength and structural ductility, and has the following advantages:
the CFRP pipe is used as a structural reinforcing material and an anode material, is multipurpose, saves engineering materials, reduces the using amount of the materials, reduces construction procedures and reduces engineering cost.
2. The effect of Impressed Current Cathodic Protection (ICCP) is achieved, and internal steel is protected from corrosion. The CFRP pipe on the outer ring protects the steel inside by an external power supply, and the corrosion of the steel is fundamentally inhibited by utilizing the unique advantages of an ICCP system, so that the durability and the long-term performance of the structure are ensured.
3. The integral combined component can be timely opened and closed to the cathode protection system, and when the steel is detected to start to be rusted, the cathode protection system is started again, so that the method for preventing the steel from being rusted can be actively controlled by human subjectivity, the integral system can be more flexible, and meanwhile, energy can be saved.
4. The crack has higher bearing capacity and rigidity, and can effectively limit the development of cracks after cracking. Because the transverse expansion of the concrete is restrained when bearing the load, the combined structure, namely the CFRP-steel concrete combined member, has very good ductility and better bearing capacity, and further improves the long-term performance of the structure.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are presented solely to aid in the understanding of the apparatus and its core concepts; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (5)

1. The cathode protection device of the CFRP-steel concrete combined member is characterized by comprising a CFRP pipe, concrete, steel and a power supply;
the steel is arranged in the CFRP pipe; when the steel is the combined steel of a single I-shaped steel and a plurality of steel bars, the plurality of steel bars are uniformly distributed around the single I-shaped steel in a circle shape, and the distances between the steel bars in the same circle and the CFRP pipe are equal; chiseling a small hole on the I-shaped steel, leading out a lead, chiseling a small hole on each reinforcing steel bar, and leading out a corresponding lead; when the steel is the combined steel of a single solid steel pipe with a circular cross section and a plurality of steel bars, the plurality of steel bars are uniformly distributed around the solid steel pipe with the circular cross section in a circle shape, and the distances between the steel bars in the same circle and the CFRP pipe are equal; chiseling a small hole on the solid steel pipe, leading out a lead, chiseling a small hole on each reinforcing steel bar, and leading out a corresponding lead;
the concrete is poured in a gap between the steel and the CFRP pipe;
the steel is electrically connected with the negative electrode of the power supply, and the CFRP tube is electrically connected with the positive electrode of the power supply; and judging the corrosion condition of the steel by detecting the potential of the steel, and starting the power supply to perform timely cathode protection when the steel is detected to start to be corroded.
2. The cathodic protection device of a CFRP-steel concrete composite member according to claim 1, wherein said CFRP tube is a CFRP tube with a circular cross-sectional shape or a CFRP tube with a square cross-sectional shape.
3. The cathodic protection device for a CFRP-steel concrete composite member as recited in claim 1, wherein when said steel material is a plurality of steel pipes having a circular cross-sectional shape, the outer walls of every two adjacent steel pipes having a circular cross-sectional shape are bonded together by a bonding material containing conductive particles, and a plurality of said steel pipes having a circular cross-sectional shape are bonded as a whole.
4. A method for preparing a cathodic protection device applied to the CFRP-steel reinforced concrete composite member of any one of claims 1 to 3, comprising:
manufacturing the CFRP pipe according to the expected size of the CFRP pipe;
manufacturing steel materials according to the expected size and the expected quantity of the steel materials;
fixing the steel material in the middle of the CFRP pipe; when the steel is the combined steel of a single I-shaped steel and a plurality of steel bars, the plurality of steel bars are uniformly distributed around the single I-shaped steel in a circle shape, and the distances between the steel bars in the same circle and the CFRP pipe are equal; chiseling a small hole on the I-shaped steel, leading out a lead, chiseling a small hole on each reinforcing steel bar, and leading out a corresponding lead; when the steel is the combined steel of a single solid steel pipe with a circular cross section and a plurality of steel bars, the plurality of steel bars are uniformly distributed around the solid steel pipe with the circular cross section in a circle shape, and the distances between the steel bars in the same circle and the CFRP pipe are equal; chiseling a small hole on the solid steel pipe, leading out a lead, chiseling a small hole on each reinforcing steel bar, and leading out a corresponding lead;
pouring concrete in a gap between the steel and the CFRP pipe, and vibrating;
and electrically connecting the negative electrode of the power supply with the steel, and electrically connecting the positive electrode of the power supply with the CFRP pipe.
5. The method for manufacturing steel according to claim 4, wherein the manufacturing of steel according to the desired size and the desired number of steel specifically comprises:
precisely processing the steel by using a lathe to manufacture the steel with expected size and quantity; when the manufactured steel is a plurality of steel pipes with circular cross sections, the outer walls of every two adjacent steel pipes with circular cross sections are bonded together through a bonding material containing conductive particles, so that the plurality of steel pipes with circular cross sections are bonded into a whole.
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CN110016674A (en) * 2019-04-25 2019-07-16 深圳大学 A kind of CFRP stirrup is the cathode protection device and method of the armored concrete of anode

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CN103215601A (en) * 2013-04-16 2013-07-24 深圳大学 CFRP (Carbon Fiber Reinforced Plastics)-reinforced concrete composite structure with cathode protection function, and manufacturing method of CFRP-reinforced concrete composite structure
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