WO1991019829A1 - A method for fixing an electrode arrangement to be used in the cathodic protection of concrete structures and a fixing element - Google Patents

A method for fixing an electrode arrangement to be used in the cathodic protection of concrete structures and a fixing element Download PDF

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Publication number
WO1991019829A1
WO1991019829A1 PCT/FI1991/000191 FI9100191W WO9119829A1 WO 1991019829 A1 WO1991019829 A1 WO 1991019829A1 FI 9100191 W FI9100191 W FI 9100191W WO 9119829 A1 WO9119829 A1 WO 9119829A1
Authority
WO
WIPO (PCT)
Prior art keywords
fixing
anode
framework
concrete
electrode arrangement
Prior art date
Application number
PCT/FI1991/000191
Other languages
French (fr)
Inventor
Martti Pulliainen
Tarja RÄMÖ
Original Assignee
Savcor-Consulting Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Savcor-Consulting Oy filed Critical Savcor-Consulting Oy
Priority to DE69127529T priority Critical patent/DE69127529T2/en
Priority to DK91910909.0T priority patent/DK0487675T3/en
Priority to EP91910909A priority patent/EP0487675B1/en
Publication of WO1991019829A1 publication Critical patent/WO1991019829A1/en
Priority to NO920638A priority patent/NO305996B1/en

Links

Classifications

    • 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
    • C23F13/18—Means for supporting electrodes
    • 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

Definitions

  • the invention relates to a method for fixing an electrode arrangement to be used in the cathodic protection of concrete structures.
  • the invention also relates to a fixing element of an electrode arrangement to be used in the cathodic protection of concrete structures.
  • the anodes of an electrode arrangement are generally fixed to an existing concrete surface, and the anode is covered with shotcrete or with another corresponding conductive material.
  • problems have been caused by the poor fixability of the electrode arrangement during the casting. Additional problems have also been caused by the fact that the anode is during the casting bent into contact with the steel constructions to be protected.
  • the object of the present invention is to provide such an anode fixing arrange- ment and method, which, when used, eliminates the above-mentioned problem situations.
  • Another object of the invention is to provide such a fixing arrangement, which well adapts itself to be used in continuos concreting applications.
  • the inventive method is mainly characterized in that the anode is mounted in a framework and that the framework with its anodes is mounted on the concrete structure at a production plant or in the mounting step before the concreting step.
  • the inventive fixing element is mainly characterized in that the fixing element is comprised of an anode and a framework, which framework is provided with means for fixing the element to the concrete structure.
  • Such an inventive anode element placed in position before the concreting is in certain cases the only technically sensible solution.
  • a considerable advantage is obtained in the preparation step, when the anode arrangement is of an element-structional type.
  • the pressing effect of the additional mass caused by shotcreting is avoided. Furthermore, the number of the work phases needed decreases, since the anode element is prefabricated, and only the fixing of the anode element has to be performed in connection with concreting.
  • the fixing of the inventive element is easy and it saves mounting time, since a separate fixing and insulating work of the anode in the mounting step is elimin ⁇ ated.
  • the inventive element remains fixed on the concrete structures, whereby no special precautionary measures are needed in the concreting step, e.g. it is not necessary to use a slower concreting rate.
  • the construction of the anode element according to the invention is mechanical ⁇ ly rigid such that it cannot come into an electrical contact with the concrete reinforcements to be protected. From the point of view of the operation of the protection, the avoidance of the electrical contact is one of the basic prerequi ⁇ sites.
  • the inventive anode element cannot move during the concret ⁇ ing owing to its fixing means.
  • the uninterruptibility of a cathodic contact is also ensured, since the connection of all concrete reinforcement layers to the cathode circuit can be guaranteed by means of several fixing points.
  • the anode element according to the invention forms a system of several elements such that each element can, when so desired, be controlled as a sepa ⁇ rate electric circuit. The operation of the anode system is thereby ensured.
  • Fig. 1A and IB show schematically an inventive anode element.
  • Fig. 2 shows as a schematic partial view an inventive anode element fixed to a concrete structure.
  • An inventive anode element 10 shown in Fig. 1A and IB comprises a framework 11, anodes 20 and fixing means 15.
  • the framework 11 is made of an electrically insulating material, e.g. of plastics or ceramics or of an electrolytically conductive material, e.g. of concrete, plastics or ceramics.
  • an electrically insulating material e.g. of plastics or ceramics or of an electrolytically conductive material, e.g. of concrete, plastics or ceramics.
  • a steel reinfor ⁇ cement or some other reinforcement is used for improving the strength prop ⁇ erties of the framework 11, which is, however, not necessary.
  • the framework 11 of the anode element 10 is made of concrete, since a good adherence to the concreting is then obtained. Furthermore, when the framework 11 is made of concrete, possible detrimental heat expansion phenomena are eliminated.
  • the anode element 10 is fixed to a concrete surface, to concrete reinforcements or to other fixed parts of the construction or to parts used during the mounting with the fixing means 15 of the framework 11, e.g. with plastic hooks, nails, wires, screws or the like.
  • the fixing means 15 shown in Fig. 1A and IB are made of concrete reinforce ⁇ ment pins, which are fixed to the concrete reinforcements of the actual concrete reinforcement structure.
  • the anode 20 is placed in the concreting of the framework 11, or the anode 20 is mechanically fixed e.g. with metallic or plastic nails, screws, anchors, lists or the like to the framework 11.
  • the anode 20 is located on the opposite side relative to the fixing means 15 of the framework 11.
  • the anode 20 is a net, wire, strip, rod, plate or the like.
  • the material used in the anode 20 is a composite material, e.g. an alloy-metal coated titan, magnetite, platinated titan or an iron mixture, e.g. ferrosilicon or graphite or a noble metal, e.g. platinum or a conductive plastic.
  • a composite material e.g. an alloy-metal coated titan, magnetite, platinated titan or an iron mixture, e.g. ferrosilicon or graphite or a noble metal, e.g. platinum or a conductive plastic.
  • the anode element 10 can either be comprised of the material of the anode 20 or of the material of the anode 20 and another material joined thereto.
  • Several anode elements 10 form a system, by means of which the steel parts of the concrete structure can be cathodically protected. Electricity is supplied to the anode element 20 e.g. via a conductor 30. The electricity is supplied separately to each anode element 20 via one or more of its points or to all anode elements 20 of the system together or by means of some combination of the two separate above-mentioned systems.
  • the framework 11 of the anode element is arranged in a wedge-like form such that the width of the crosspiece of the framework 11 is on the side of the anode 20 greater than on the side of the fixing means 15, whereby the concrete can during the casting easily flow also inside the framework.
  • the anode element 10 is fixed to the steel parts 50 of the concrete reinforcement structure so that the fixing means 15 of the anode element 10 are fixed to the steel parts 50.
  • the anode element 10 is fitted between the outermost concrete reinforcement layer and the concreting wood hning 60, into which the concrete 70 is cast.
  • the anodes 20 of the anode element 10 are located on the other side of the framework 11 relative to the steel parts 50, whereby the anode 20 cannot come into contact with the steel parts 50.

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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)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
  • Measurement Of Force In General (AREA)

Abstract

The invention relates to a method for fixing an electrode arrangement to be used in the cathodic protection of concrete structures. In the method, an anode (20) is mounted in a framework (11) and the framework with its anodes is mounted on the concrete structure at a production plant or in the mounting step before the concreting step. The invention also relates to a fixing element (10) of the electrode arrangement to be used in the cathodic protection of concrete structures, which fixing element is comprised of an anode (20) and a framework (11), which framework (11) is provided with means (15) for fixing the element (10) to the concrete structure.

Description

A method for fixing an electrode arrangement to be used in the cathodic protection of concrete structures and a fixing element
The invention relates to a method for fixing an electrode arrangement to be used in the cathodic protection of concrete structures.
The invention also relates to a fixing element of an electrode arrangement to be used in the cathodic protection of concrete structures.
In the protection of steel parts of concrete structures, e.g. concrete reinforce¬ ments, the anodes of an electrode arrangement are generally fixed to an existing concrete surface, and the anode is covered with shotcrete or with another corresponding conductive material. However, problems have been caused by the poor fixability of the electrode arrangement during the casting. Additional problems have also been caused by the fact that the anode is during the casting bent into contact with the steel constructions to be protected.
The above-mentioned situtations have made it considerably more difficult and slower to carry out the actual concrete casting.
The object of the present invention is to provide such an anode fixing arrange- ment and method, which, when used, eliminates the above-mentioned problem situations.
Another object of the invention is to provide such a fixing arrangement, which well adapts itself to be used in continuos concreting applications.
For reaching the objects mentioned above and to be presented below, the inventive method is mainly characterized in that the anode is mounted in a framework and that the framework with its anodes is mounted on the concrete structure at a production plant or in the mounting step before the concreting step.
The inventive fixing element is mainly characterized in that the fixing element is comprised of an anode and a framework, which framework is provided with means for fixing the element to the concrete structure.
Such an inventive anode element placed in position before the concreting is in certain cases the only technically sensible solution. When, for example, protecting underwater concrete structures, a considerable advantage is obtained in the preparation step, when the anode arrangement is of an element-structional type.
When using the inventive anode fixing arrangement, the pressing effect of the additional mass caused by shotcreting is avoided. Furthermore, the number of the work phases needed decreases, since the anode element is prefabricated, and only the fixing of the anode element has to be performed in connection with concreting.
The fixing of the inventive element is easy and it saves mounting time, since a separate fixing and insulating work of the anode in the mounting step is elimin¬ ated.
The inventive element remains fixed on the concrete structures, whereby no special precautionary measures are needed in the concreting step, e.g. it is not necessary to use a slower concreting rate.
The construction of the anode element according to the invention is mechanical¬ ly rigid such that it cannot come into an electrical contact with the concrete reinforcements to be protected. From the point of view of the operation of the protection, the avoidance of the electrical contact is one of the basic prerequi¬ sites. In addition, the inventive anode element cannot move during the concret¬ ing owing to its fixing means. When using the inventive element, the uninterruptibility of a cathodic contact is also ensured, since the connection of all concrete reinforcement layers to the cathode circuit can be guaranteed by means of several fixing points.
The anode element according to the invention forms a system of several elements such that each element can, when so desired, be controlled as a sepa¬ rate electric circuit. The operation of the anode system is thereby ensured.
The invention is next described in more detail with reference to the figures of the accompanying drawing, to which the invention is, however, in no way narrowly limited.
Fig. 1A and IB show schematically an inventive anode element.
Fig. 2 shows as a schematic partial view an inventive anode element fixed to a concrete structure.
An inventive anode element 10 shown in Fig. 1A and IB comprises a framework 11, anodes 20 and fixing means 15. The framework 11 is made of an electrically insulating material, e.g. of plastics or ceramics or of an electrolytically conductive material, e.g. of concrete, plastics or ceramics. When so desired, a steel reinfor¬ cement or some other reinforcement is used for improving the strength prop¬ erties of the framework 11, which is, however, not necessary.
In one preferred embodiment of the invention, the framework 11 of the anode element 10 is made of concrete, since a good adherence to the concreting is then obtained. Furthermore, when the framework 11 is made of concrete, possible detrimental heat expansion phenomena are eliminated.
The anode element 10 is fixed to a concrete surface, to concrete reinforcements or to other fixed parts of the construction or to parts used during the mounting with the fixing means 15 of the framework 11, e.g. with plastic hooks, nails, wires, screws or the like.
The fixing means 15 shown in Fig. 1A and IB are made of concrete reinforce¬ ment pins, which are fixed to the concrete reinforcements of the actual concrete reinforcement structure.
The anode 20 is placed in the concreting of the framework 11, or the anode 20 is mechanically fixed e.g. with metallic or plastic nails, screws, anchors, lists or the like to the framework 11.
The anode 20 is located on the opposite side relative to the fixing means 15 of the framework 11.
The anode 20 is a net, wire, strip, rod, plate or the like.
The material used in the anode 20 is a composite material, e.g. an alloy-metal coated titan, magnetite, platinated titan or an iron mixture, e.g. ferrosilicon or graphite or a noble metal, e.g. platinum or a conductive plastic.
As described above, the anode element 10 can either be comprised of the material of the anode 20 or of the material of the anode 20 and another material joined thereto. Several anode elements 10 form a system, by means of which the steel parts of the concrete structure can be cathodically protected. Electricity is supplied to the anode element 20 e.g. via a conductor 30. The electricity is supplied separately to each anode element 20 via one or more of its points or to all anode elements 20 of the system together or by means of some combination of the two separate above-mentioned systems.
The framework 11 of the anode element is arranged in a wedge-like form such that the width of the crosspiece of the framework 11 is on the side of the anode 20 greater than on the side of the fixing means 15, whereby the concrete can during the casting easily flow also inside the framework. In accordance with Fig. 2, the anode element 10 is fixed to the steel parts 50 of the concrete reinforcement structure so that the fixing means 15 of the anode element 10 are fixed to the steel parts 50. The anode element 10 is fitted between the outermost concrete reinforcement layer and the concreting wood hning 60, into which the concrete 70 is cast.
As shown in Fig. 2, the anodes 20 of the anode element 10 are located on the other side of the framework 11 relative to the steel parts 50, whereby the anode 20 cannot come into contact with the steel parts 50.
The invention has above been described only with reference to an example of its preferred embodiment. However, the intention is in no way to limit the invention to this example, but many changes and modifications are possible within the inventive idea defined in the following patent claims.

Claims

Claims
1. A method for fixing an electrode arrangement to be used in the cathodic protection of concrete structures, characterized in that an anode (20) is mounted in a framework (11) and that the framework with its anodes is mounted on the concrete structure at a production plant or in the mounting step before the concreting step.
2. A fixing element of an electrode arrangement to be used in the cathodic protection of concrete structures, characterized in that the fixing element (10) is comprised of an anode (20) and a framework (11), which framework (11) is provided with means (15) for fixing the element (10) to the concrete structure.
3. A fixing element according to Claim 2, characterized in that the framework (11) is made of concrete.
PCT/FI1991/000191 1990-06-20 1991-06-19 A method for fixing an electrode arrangement to be used in the cathodic protection of concrete structures and a fixing element WO1991019829A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE69127529T DE69127529T2 (en) 1990-06-20 1991-06-19 METHOD FOR FASTENING AN ELECTRODE ARRANGEMENT FOR CATHODIC CORROSION PROTECTION OF CONCRETE STRUCTURES AND FASTENING ELEMENT
DK91910909.0T DK0487675T3 (en) 1990-06-20 1991-06-19 A method of attaching an electrode device for use in cathodic protection of concrete structures and a fastener
EP91910909A EP0487675B1 (en) 1990-06-20 1991-06-19 A method for fixing an electrode arrangement to be used in the cathodic protection of concrete structures and a fixing element
NO920638A NO305996B1 (en) 1990-06-20 1992-02-18 Method of Attaching an Electrode Arrangement for Use in Cathodic Protection of Concrete Structures and Attachment Elements of the Electrode Arrangement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI903119A FI87241C (en) 1990-06-20 1990-06-20 Method of attaching an electrode arrangement used for cathodic protection of concrete structures and fasteners
FI903119 1990-06-20

Publications (1)

Publication Number Publication Date
WO1991019829A1 true WO1991019829A1 (en) 1991-12-26

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PCT/FI1991/000191 WO1991019829A1 (en) 1990-06-20 1991-06-19 A method for fixing an electrode arrangement to be used in the cathodic protection of concrete structures and a fixing element

Country Status (10)

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EP (1) EP0487675B1 (en)
JP (1) JP3184215B2 (en)
AT (1) ATE157711T1 (en)
AU (1) AU637246B2 (en)
CA (1) CA2064701A1 (en)
DE (1) DE69127529T2 (en)
DK (1) DK0487675T3 (en)
FI (1) FI87241C (en)
NO (1) NO305996B1 (en)
WO (1) WO1991019829A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0534392A1 (en) * 1991-09-23 1993-03-31 Oronzio De Nora S.A. Anode structure for cathodic protection of steel reinforced concrete and relevant method of use
EP0560452A1 (en) * 1992-03-13 1993-09-15 ITALCEMENTI S.p.A. Cement-like support material for the cathodic protection of reinforced concrete structures

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5918640B2 (en) * 2012-06-26 2016-05-18 住友大阪セメント株式会社 Cathodic protection method
CN112681345A (en) * 2020-12-04 2021-04-20 中交第一航务工程局有限公司 Installation process of prefabricated block for framework slope protection

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986006759A1 (en) * 1985-05-07 1986-11-20 Eltech Systems Corporation Cathodic protection system for a steel-reinforced concrete structure and method of installation
EP0262835A1 (en) * 1986-09-16 1988-04-06 RAYCHEM CORPORATION (a California corporation) Mesh electrodes and clips for use in preparing them
WO1989010435A1 (en) * 1988-04-19 1989-11-02 Michael George Webb Inhibiting corrosion in reinforced concrete
DE3826926A1 (en) * 1988-08-09 1990-02-15 Heraeus Elektroden ANODE FOR CATHODIC CORROSION PROTECTION

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986006759A1 (en) * 1985-05-07 1986-11-20 Eltech Systems Corporation Cathodic protection system for a steel-reinforced concrete structure and method of installation
EP0262835A1 (en) * 1986-09-16 1988-04-06 RAYCHEM CORPORATION (a California corporation) Mesh electrodes and clips for use in preparing them
WO1989010435A1 (en) * 1988-04-19 1989-11-02 Michael George Webb Inhibiting corrosion in reinforced concrete
DE3826926A1 (en) * 1988-08-09 1990-02-15 Heraeus Elektroden ANODE FOR CATHODIC CORROSION PROTECTION

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0534392A1 (en) * 1991-09-23 1993-03-31 Oronzio De Nora S.A. Anode structure for cathodic protection of steel reinforced concrete and relevant method of use
EP0560452A1 (en) * 1992-03-13 1993-09-15 ITALCEMENTI S.p.A. Cement-like support material for the cathodic protection of reinforced concrete structures

Also Published As

Publication number Publication date
NO920638L (en) 1992-02-18
JPH05500834A (en) 1993-02-18
JP3184215B2 (en) 2001-07-09
ATE157711T1 (en) 1997-09-15
AU8080691A (en) 1992-01-07
CA2064701A1 (en) 1991-12-21
EP0487675A1 (en) 1992-06-03
DE69127529D1 (en) 1997-10-09
FI903119A (en) 1991-12-21
AU637246B2 (en) 1993-05-20
FI87241C (en) 1992-12-10
FI87241B (en) 1992-08-31
FI903119A0 (en) 1990-06-20
DK0487675T3 (en) 1998-04-20
NO305996B1 (en) 1999-08-30
NO920638D0 (en) 1992-02-18
DE69127529T2 (en) 1998-02-26
EP0487675B1 (en) 1997-09-03

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