JPS62503040A - Cathodic protection system for steel reinforced concrete structures and its installation method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] name of invention Cathodic protection system for steel reinforced concrete structures and its installation method field of invention The present invention generally applies to school areas, parking lots, piers, and supports therefor. Cathodic protection systems for steel-reinforced concrete structures and such systems Regarding how to install the system.

Background of the invention The problem with corrosion of reinforced steel in concrete is Brother Zhou. steel reinforcement is School district in general? For many years, many machines have been used in concrete IJ structures such as parking lots. function. The alkaline environment of Portland cement does not corrode the steel surface. This is because it makes it a ``passive body.'' However, the problem is that in the 1960s, The increase in the use of road salt and the increase in construction near the coast have led to widespread brought problems.

This problem occurred due to waterproofing, chlorine ions contained in salt and seawater, and new coatings. The chlorine ions added to the concrete keep the steel surface in an unexpected state. It is based on destroying Lee-1's ability. Chlorine concentration per cubic meter of concrete Sh. , 6 to 0.8, 9 is the limit value, and if it exceeds it, the steel in the concrete The wall begins to corrode. When corroded, the steel becomes 2.5 times its original volume and the surrounding area Add tensile stress to concrete. This stress exceeds the tensile strength of concrete. As a result, cranking and peeling progress. Corrosion, freezing/thawing and traffic loads continue Then, things got even worse and a hole appeared in the floor.

, concrete quality, construction method, surface sealer, waterproofing membrane, coated reinforced steel, Research and development efforts such as concrete additives and corrosion inhibitors enable new floor construction The condition of things has improved.

New school districts built with specific corrosion protection systems have a longer lifespan and require less maintenance and repair. It is generally agreed that there are few problems. However, since the mid-1970s Many previously constructed concrete structures were largely contaminated with salt. , is deteriorating at a dangerous rate. Completely remove concrete contaminated with salt It is often recognized that cathodic protection is the only means to stop corrosion in concrete without Ru.

Cathodic protection, by applying a DC current to the metal to make it a cathode, or sacrificial anode Corrosion of metals is reduced or eliminated by installing a In this way Supplying external energy to the surface of the surface, it is used as a current receiving shade, and the first It prevents the formation of iron ions. Cathodic protection was strengthened for the first time in June 1973. Applied to conch and leet floors. Since that time, knowledge and techniques have improved, but strengthened The applied current + S pole used to distribute current to steel remains a large wall. It was. The anode must be molded with the following properties.

1. The ability to withstand traffic loads and environmental conditions; 2. The life of the surface where the design life wears out. 3. The surrounding concrete will not deteriorate prematurely and will be compatible with reinforced steel. 4. Sufficient surface area to provide good current distribution; 4. Economically reasonable to install and maintain. Something.

Historically, three types of anodes were used for steel cathodes in concrete bridge decks: came. Conductive overlays, grooved non-overlays and non-conductive overlays It is a distributed anode (e) with a.

The conductive overlay was the first anode used and is still considered a useful system. It is being The anode in this case is typically asphalt or coke used in metallurgy. A mixture of powder and aggregate is combined with high-silicon cast iron to act as a current contactor. consists of things. This system distributes the current very evenly over the floor surface, positive = a Since the surface area is small, there is acid from the anode reaction product on the Portland cement at the bottom. No other signs of chemical attack were observed. However, this coke-asphthalate Alt overlays exhibit structural failure in numerous instances, resulting in systems that must be replaced within a few years. There was a limit. Unfortunately, the concrete under the overlay is improperly entraining air. Freeze-thaw deterioration occurs, limiting its use only to floors with proper foam systems. was there.

Slottea non-man-burley Yoju expands anode life and applicability. Developed to create a system that does not increase the dead load and height of the school area. It was. In this system, parallel grooves are first cut in the floor approximately 30-45 cm apart.

This groove is filled with a ``conductive grout'' mixture consisting of carbon and organic fat that functions as the anode surface. meet the compound. This conductive grout 9 has a limited conductivity, so platinum plating is A system of metal or carbon strand conductors distributes the current to the anode. This anode is suitable What strength? Although the surface area was small, adjacent concretions REETs are frequently attacked by acids and gases from anodic reaction products. Also, the grooves are widely separated. The distribution of current to the reinforced steel is not ideal because the current connections are Due to the lack of long wires, there was also damage due to cracking and other disconnections. Furthermore, Hokonoshi Stems are labor-intensive and time consuming to install.

Distributed anodes with ionically conductive overlays are similar to grooving systems, but Installation is easy. - In a variant, the conductive polymer grout anode is plated with platinum. placed directly on the surface of the existing floor with current conductors of metal wire and carbon strands, Cover it with latex-modified concrete or regular concrete.

Rigid, non-conductive overlay extends floor life and slows the penetration of added salt Minimizes freeze-thaw damage to concrete and creates new, skit-resistant This is preferred because it provides a riding (rldlng) surface. However, this The stem also has a bamboo cutting system for current distribution, song and scum attacks and lack of redundancy. It has the same drawbacks as the stem.

Another type of anode for use with rigid, ionically conductive oat Some use flexible polymeric anode materials that do not require reconstitution materials. child It is manufactured as a continuous cable, woven into a large mesh, and placed on the floor, usually covered with a rigid overlay. This system requires less time to install. The disadvantages of current distribution, acid and gas attack, and lack of redundancy still exist. like this Polymeric anodes are described in U.S. Pat. Nos. 4,473,450 and 4,502.9. 2 (described in No. 1. This polymer anode is It is commercially available in woven mesh with gap metal molding. At some point the cable If it breaks, the cathodic protection effect is lost over a considerable area. Also, the cable The thickness (approximately 8 mm) is limited only when thinning/overlaying is desired. I can do it.

A fourth type of system for use on substructures is relatively recent. is a system in which the anode material is applied or sprinkled directly onto the concrete surface.

I? For example, apply carbon-filled paint and mastic to concrete. Ru. This system provides a large positive force and the current distribution to the reinforced steel is ideal. It is true. However, the resistance value is high and the anode material frequently peels off, shortening the lifespan ( Therefore, it is necessary to add all platinum-plated wire or carbon strand current connectors. It is necessary to

For example, British Published Patent Application No. 2g No. 2.1.40.456A discloses that conductive paint is coated with A conductive overlay system that is applied to concrete surfaces to form an anode film. It is described below. A platinized titanium or niobium main anode placed every 10-50 meters to supply current to the film; Functions as a flow introduction section.

Sprayed zinc anodes have also been used. (gAJ U.S. Patent No. 4, .506,48 Please refer to No. 5. ) Zinc acts as a natural battery conditioner, thus reducing DC% full power. It was initially thought that there was no need to supply it. However, the Oshifune is fixed. The natural voltage applied is too low to radiate current over a sufficient distance within the concrete. However, a power supply and current distribution system is still required. This problem is Sacrificial anode systems on bridges, combined with problems posed by expandable corrosion products of lead The use of tem was kept to a minimum.

Cathodic protection of reinforced steel in concrete, with the exception of systems that use all barge anodes. Until now, all processing systems have used charcoal as the electrochemically active anode. I've been using raw material. Carbon was first used as an anode in conventional cathodic protection. This was because it was used for a wide range of purposes. A further reason why carbon was used was to Cathodic protection of the gate requires very low current density, i.e. very large I@pole surface area. This was because. This means that the anode must be removed at low cost; The raw material is relatively cheap.

Pure carbon is not available in a structure suitable for use inside concrete. Conductive fillers in Ariiso resins, thermoplastic polymers, paints and mastics. Carbon was used as.

This technology provides a physical form of carbon that can be used in combination with concrete. However, other disadvantages of carbon remain.

Carbon has a low electrical conductivity compared to metals (and requires an elaborate current conductor system.

In addition, carbon is thermodynamically unstable in the field and reacts with carbon dioxide CO2. , carbonate H2CO3 and carbonate HCO3, CO3 sudo for Portland cement. and form harmful reaction products – it has been said that these reactions are kinetically slow. However, the effect on anode life is significant. Solid electrolyte such as concrete When in contact with the electrolyte, even a small amount of oxidation can disrupt the positive-electrolyte interface and cause electrical contact. Touching: This is because it may cause damage. Carbon is an anode with poor electrochemical activity.

The unipolar potential of the longitudinal cable anode is relatively high when operating in chloride-contaminated concrete. , releases chlorine gas CQ2 and hypochlorite CuO. These reaction products are likely (Although it is not harmful to concrete, it is a strong oxidizing agent, so it may be difficult to match the organic binder used.) This causes a reaction, which also causes problems in the life of the anode.

In short, among the anodes used to date, steel in concrete None possess all the properties desired in cathodic protection. seems economically reasonable Although there are many types of concrete that are in contact with the anode, Many lack a suitable area, and many do not provide ideal current distribution. , all pose serious problems regarding anode lifetime. Zinc ecstasy is oxidized This leads to chemical extraction, which separates the concrete-concrete interface. Contains carbon All anodes operated at high monopolar potentials are free from adjacent contaminants such as chlorine, acids and carbon dioxide. Sometimes damage can occur to the slicing matrix used to bond the REET and carbon. Generates products that can cause damage.

Electrochemically active anodes for all types of valve metal substrates are available on the market and have many applications and ( in the production of chlorine, chlorate and hypochlorite and in metal extraction processes. It has been successfully used as an oxygen anode. Generally, such electrodes are cost-effective. For "high" current densities, e.g. It is particularly advantageous for use in 3-5 KA/m' in ion exchange membrane electrolytic cells. This way Eel electrodes have also been proposed for anti-corrosion purposes, but their use in this field is limited. There was only one. A typical cathodic protection arrangement uses platinum-plated copper-titanium core wire. Use to protect metal structures from corrosion. PCT application WO30101488 is It describes an array wrapped around a pure gold insulating rope. UK patent application No. 2,000,808A, the conventional platinum-plated wire or rod is Grooved valve metallization with anode active material on the shaped spine (spinθ) We are proposing to replace it with an IJ tube.

Platinum dowel valve metal mesh has also been proposed for cathodic protection of certain structures.

For example, see Corrosion 179 J Ronmatani No. 194.

This theory or 0.05yr coated with a 1-15 micron platinum layer? less than ten The use of a titanium expanded mesh is described, and the mesh is 2 ．． 15 A/eLrr? The current density can be as follows. This is the total content of carbonaceous backfill. It was used as a discrete anode in the ground. Q This kind of rigid anode mesh with a total area of , 5 m”i is suitable for the protection of remote structures. It was proposed as an edible separation electrode.

U.S. Pat. No. 4,519,886 discloses a linear anode structure for cathodic protection of metal structures. It is written about. This structure is placed at intervals along the power supply cable. and connected to the cable. this Cylindrical anode segments are made by bending expanded titanium into its shape and mixing It is coated with a metal layer.

All existing coated pulp metal potentials, including those proposed for other cathodic protection applications, It will be clear that it is not suitable for cathodic protection of concrete structures. Especially this Yangtai's design is unsuitable for installation in non-purposes, and the installation cost is prohibitive. It will be.

One of the main features of the present invention as set forth in the claims is that a concrete structure in which an applied current field is used A novel cathodic-protected steel embedded in an ionically conductive overlay on top. In reinforced concrete structures, the positive structure is a net of valve metal strands. one or more notes of pulp metal mesh having a void shape defined by the workpiece; A new cathodic-protected steel reinforced concrete structure consisting of Ru. Each mesh strand is connected by many nodes and passes through all the meshes. Adds redundancy to the current flow path, allowing the current to flow even if many individual strands break. Make sure it is distributed throughout the mesh. The surface of the valve metal mesh is electrochemical carries a sexually active coating. Furthermore, the positive anger supplies the full amount of current to the valve metal mesh. It contains one or more current distribution members for. Valve metal mesh seat (singular or The V number) extends continuously over the entire area of the structure to be protected against corrosion, and is connected to each other. more than twice the maximum dimension of the mesh void in two perpendicular directions (two adjacent mesh There are no discontinuous areas (between threads). In other words, corrosion protection due to obstacles etc. Entire urine at the entrance area that has not been treated (the entire structure to be protected against corrosion must be covered with one piece of mesh or It is covered by several sheets of mesh closely adjacent to each other.

The mesh is made of exno-dead metal with a maximum thickness of 0.1'25cys. Typically, it is preferably made of 7-metal expanded titanium. The magnification is 10 times or more, preferably 15 to 30 times. . Such expansion creates a substantially diamond-shaped void and a mesh square meter. of valve metal strands interconnected with approximately 500 to 2000 nodes. Give a continuous network. Such meshes are highly flexible and durable. It runs parallel to the long path of the diamond shape. Coiled and highly expanded valve Further details regarding the metal mesh 2 and its manufacturing method can be found in the application (Intake E0 0182-02A&B), the contents of which are quoted here.

Instead of using all 7 parts of the expanded pulp metal mesh in the opening, it is used in the bathing process. Made of pulp metal, metal ribbons interconnected into a more hexagonal or honeycomb shape It is also possible to use a valve metal mesh 7. Such a composite mesh is , the same dimensional and shape requirements as those described above for expanded mesh. It must be something that meets the needs of the people.

The valley current distribution member is exposed to the same electrochemically active material as in the mesh. Preferably, a strip of molded Nomilb metal is metallurgically bonded to the mesh. . Appropriate current density Kk is applied to the mesh in many installations such as parking lot floors and school districts. Measuring the current distribution strips at intervals of 50 meters from FJlo Advantageously, it is joined to a tush. Pulp metal mesh is recommended for such installations. Stretch across two or more sheets of a roll, e.g. A common current distribution strip extending across two long sheets of mesh It is both cost saving and convenient to bond the material to the sheet.

It is most advantageous to spot weld the current distribution strip to the nodes of the mesh . This spot welding consists of mesh and strips covered with a suitably thin electrocatalyst coating. This can be done on the facing surfaces of the pool.

Each point of the mesh is connected to the concrete by fasteners inserted into drilled holes in the structure. It's hard to beat. Secure the mesh to the structure before applying the ionically conductive overlay. Alternative means of bonding are also possible, including the use of adhesives. Regarding this point, please refer to the installation method and A more detailed explanation will be given in connection with this.

You can stack the edges of two long sheets side by side to reduce the number of fixing points during assembly, or overlap them. Two or more mesh sheets, such as a full-length knot designed to make an electrical connection with They may be stacked on top of each other.

However, when the sheets are joined by a current distribution member, the sheets are in contact with each other. The maximum dimension (LWD) of the diamond-shaped holes in the mesh ) are spaced apart by a distance approximately corresponding to .

In addition, one or more meshes can be used to prevent normal current from obstructions on structures such as drainage equipment on the upper floor of the parking lot. The distribution member may have 9 cutouts around the hole through the floor to connect to the full power source. be.

Adjacent mesh sheets can be welded directly or through connecting strips. Although both are possible, they are usually not preferred.

In most structures, the ionically conductive layer is e.g. about 3-6 cm implanted at a time. Thick Portland cement (is a polymer-modified concrete. Usually , prior to overlay, bonding grout i.e. a separate cement without large aggregates is applied. A dent-based grout is applied. This grout is mixed and poured onto the surface. The mesh is brushed immediately before overlay.

The cathodically protected structure of the present invention is preferably connected to a current distribution member and The surface area of the mesh strand R is 5io.

Cathodic protection currents can be delivered as continuous or intermittent currents at current densities up to mA. It has power supplies arranged so as to

The structure has a concrete floor covered with a series of long, side-by-side mesh sheets, If a common current distribution strip extends across the seatla, its current distribution Connect the strip to a power source that is easily accessible for underfloor repairs, etc. It is convenient to extend it through a hole within.

The structure to be treated with anti-corrosion treatment may be cylindrical (for example, mesh and ion 4). Wrapped with electrical overlay. In this case, the current distribution member is placed vertically on the cylinder. υ, the mesh covers the entire circumference bt of the cylinder without overlap. One or more sheets cut to size for wrapping.

The present invention provides a stratifier effective for oxygen generation on a coated valve metal mesh surface. At a current density of less than 100 mA per land surface area R, it can be applied continuously to pulp metal mesh. It also relates to a method of applying cathodic protection to the above structure by supplying full intermittent current. do.

This current density is periodically applied to the reinforced steel by appropriately distributing reference electrodes in the vicinity of the reinforced steel. Full measurement of the corrosion potential of the steel. This can be established by setting the flow density.

It is also very useful to make the valve metal mesh with an electrocatalyst coating. It is advantageous. However, this reference electrode is relatively small, e.g. Approximately 1-3cm x length 2-10cm, with a convenient design and extremely rigid regular valve metal. Produced in genus mesh. These reference electrodes have the same level of comparability as steel reinforcement. Placed horizontally in a recess within the cleat structure, approximately 2-3 cm horizontally from the steel. It will be arranged. In this position the reference electrode preferably occupies a position kk within the electric field and the steel exposed to electrolyte compositions typical of the surrounding corrosive environment. Steel in most structures is located approximately 3 to 10 cm below the concrete surface. Typically, anode mesh One to two reference chambers are arranged for every approximately 500R area of the area. Electrolysis on the reference electrode The catalyst coating can be identical to that on the anode mesh or can be catalyzed at a precise reference potential. Special formulations selected to generate the element may also be coated. These coated Valve metal reference electrodes offer considerable advantages over the conventional metal reference electrodes used to date. have For example, the potential of this reference electrode is It does not rely on ionic species concentrations that vary significantly within the electrolyte, as is the case at the poles. Also , this potential is applied to the electrode surface, as in the case of molybdenum/molybdenum oxide doping does not undergo υ change due to the reaction of

The cathodic protection system of the invention described so far has the following advantages.

- Use of non-corrosive valve metal (titanium). This system is compatible with carbon and corrosive metals. For example, do not use articulation.

-Only oxygen is generated from the coating field during use. Activated chlorine is itself a long-term hazard. However, although it occurs in other types of field practices, it does not occur with the anode of the present invention. stomach.

- All electrical connections within the ionically conductive overlay involve metallurgical bonding (welding). used. There are no mechanical connections or copper conductors inside the concrete.

The fine mesh structure of one anode ensures uniform current distribution.

- The anode mesh is made up of interconnected strands called probes that act as multi-current paths. Make a mold. Because of this, stresses within the structure or future coring can cause strands 8 The system will reliably continue to operate satisfactorily even if some of the wires break.

- At the point where the mesh is connected to the current distribution member, there are several A bath contact can be provided. However, one or two is enough.

It is a mesh that was expanded in the first summer, so it is low cost and the amount of catalyst supported is low. This system is very cost-effective due to its ease of installation and installation. It is something that was given.

In addition, the electrocatalytic coating used in the present invention allows the anode to operate at a very low potential. It is expected that it will have a lifespan of 20 years or more for shade protection applications. until today Unlike other positives used for corrosion protection of steel in concrete, completely It has excellent dimensional stability and does not emit carbon dioxide or chlorine from chloride-contaminated concrete. I can't do it ℃・. Furthermore, the acid generated from the anodic reaction rewrites the surrounding concrete. It has sufficient surface area.

Main other features of the claimed invention are that the coated valve metal electrode is made of steel. Le reinforcement conch! J-1- Applied current lS# pole in cathodic protection system of structure This is a new method to install as a.

In this novel method, a flexible sheet of valve metal mesh is first prepared. . This mesh consists of a net of retarval metal strands connected with a large number of nodes. This network has redundancy in the current carrying path via the mesh. Even if many individual strands break, the effective current is maintained throughout the entire mesh. distribute. This valve metal mesh is electrochemically active on the surface as described above. a sheet of highly expanded valve metal with a flexible coating and a shaped void It is most preferable that it consists of . By selection, this coiled mesh One or more valve metal current distribution members are all metallurgically joined and all of the members are relative to the roll axis. Generally, they may be extended in parallel. Alternatively, the mesh or winding can be returned to the site. The entire current distribution member may be joined to the mesh.

The basic principle of the installation method according to the invention is that one or more of the coated valve metal meshes Fully unwind the roll and install it to match the shape of the concrete structure to be protected against corrosion. , fix the valve metal mesh to the structure, and attach the fixed valve metal mesh to the Embedded within a conductive overlay.

As previously mentioned, the current distribution member is a rolled mesh or Metallurgically bonded to the tush. This is a relatively small concrete structure such as a column. Suitable for construction. Such a current distribution member is installed on the mesh before it is coated. You can weld it (or after unrolling the covering mesh and cutting it to a certain size). , the mesh can also be welded on-site prior to installation in the entire structure.

However, for most large structures, pre-coated valve metal strips For example, if the strip is rolled back onto the mesh after it has been rolled back on the structure, It is very effective to spot-weld the fully returned mesh on-site and join it metallurgically. It turned out to be an advantage. This field welded strip is then connected to the mesh by electrical current. It is used as a current distribution member for supplying current.

The preferred installation method for large structures such as school zones and parking lot floors is to install two or more meshes. A common method of lining up the rolls, unwinding them completely, and then extending them across the lined meshes. A method of electrically connecting meshes with current distribution transverse strips. this method is used when the current distribution strip is placed entirely on a generally flat structure to be protected against corrosion. It's advantageous. The coated valve metal strip is designed to ensure that the current carrying capacity of the system A suitable distance calculated to give the desired value, typically in the range of 15 to 50 meters. spaced within the range. This strip should be placed to the side. Next, the first roll is fully returned, and before the mesh is fixed to the structure. Alternatively, after fixing (which is preferable) the mesh can be traversed by Spot weld to the lip.

The second roll of mesh is then unwound and welded to the transverse strips so that the entire structure is Continue this until covered.

Alternatively, especially for vertical surfaces, irregularly shaped structures and downward facing surfaces. First, on the ground, the metshu's width is completely returned. Then weld the current distribution strips and Cut the sheath to an appropriate size and join by welding if appropriate. Then the current Distribution member? Paste the attached mesh onto the surface of the structure and match it to the shape of the structure. Ru. This operation includes wrapping around curved surfaces, bending around corners, meshing all of it. In its own plane, the envelope can be bent to fit the helical surface, and the mesh f : Appropriate 1! Means - including stretching the mesh if necessary before fixing do.

Fixing (fixing method) to the structure on the mesh for various structures It has been carried out. One method is to drill into the concrete: make holes and make meshes (7 holes). This is a method of inserting a fastener of an appropriate shape to be held at the bottom of the cap. Another method, Apply hot melt adhesive to the nodes of the mesh, for example. For example, use a PTPE-coated steel heat sink to hold the mesh on the surface. Fix the tshu. Honmelt adhesive cured in this way is about 10 sand harden. Alternatively, you can use a box to snap-click the underside of the mesh note. There is a way to fix it. Clips hingedly attached after epoxy cures The mesh is fixed by snapping down the LD part of the mesh. Drilling in some places These methods, such as inserting holes and fasteners, and using adhesives in other locations, It is also possible to combine laws.

Before fixing, the rolls were fully unrolled to improve flatness, especially to eliminate bulges. Preferably, the mesh is stretched longitudinally and/or transversely. Generally vertical Stretching to about 10 inches of normal SWD dimensions is quite reasonable.

Crossing current distribution grid) Since there is an IJ mesh, all sides of adjacent meshes are connected to each other. There is no need to make contact or weld. Actually, about I L'? J D Mateichi Even if there is a gap, it is perfectly fine. Nevertheless, there are many connection points of mesh Required structures, such as structures with uneven surfaces or structural reasons - C: The conductive overlay must be very thin and must be kept on the structure. It is also appropriate to slightly overlap the sides of adjacent meshes. In this way, Reduces the number of fixed points required.

Spread out several mesh rolls on a large floor and arrange them side by side. of this surface The width is usually determined by arranging the rolls at appropriate intervals (usually the desired maximum The spacing is Metsch's ILWD, 1 method), or the rolls are all <・' apart from each other. Fill with a given number of rolls by folding or overlapping with appropriate width. It's a colander. For this reason, the mesh has a special edge strip: Does not require expensive operations.

Locations of structures with obstructions, such as drainage equipment on floors where snoring occurs, and the area around the obstruction. Cutting off a part of the mesh in order to make it more profitable is a cost effective measure. This is a simple work It can be performed in the field using ear cutters.

For long structures that exceed the length of one mesh roll, one end of the mesh roll should be fully unwound. The end of the mesh is overlapped with the adjacent part of the next roll, or all electrical connections are applied on both sides. All joints may be welded together or connected to welded strips for this purpose. Can be done. This means that the length of the end follows its own transverse current distribution strip. is insufficient: it is necessary only in certain cases. Stack it up! When making electrical connections, Overlapping part? It is advantageous to fix 9 only on the lower surface.

The end of the structure where the mesh roll climbs up the wall etc.'''C: Also, the end of the mesh roll Cut the mesh to a length that bends against the wall and exceeds the border if necessary. It's easy to do.

Most structures 1: The ionically conductive layer is approximately 3-6 cm thick, such as sprayed. Portland 9 cement concrete 1/or polymer? Consists of modified concrete. Typically, the overlay is preceded by a bonded grout i.e. A separate cement-based grout without significant aggregate is applied. This grout are mixed, poured onto the surface and blotted just before overlaying.

For structural or other reasons: Thin (and ion conductive if overlay is required) The conductive overlay should be applied in several thin layers. Metush is essentially the first buried in one layer. For example, more than 90% of the mesh is covered. At this point, Mermetsu Identify all the protruding parts of the shell and identify the next layer? flatten or hem them before turning It's too much. Typically, strands up to 0.125 cm thick are used. The inventive advantage of strands is that 6rran is effective in any thin overlay. It can be used for This cannot be effectively achieved with other predicate systems. That's true.

As mentioned above, the inventive method of installing cathodic protection systems has numerous advantages. . This installation method is easy to implement and can be installed in a variety of shapes and sizes, which requires a lot of effort. can be easily applied to legal structures. Convenient coil-shaped valve metal anode mesh By using it, it can be quickly adapted to large-area structures to be crash-protected. child The fine anode mesh has interconnecting strings called probes that act as multiple current paths. Land 1f: Provided. This may result in stress within the structure or future coring. Due to the stress of some strands Continuing Ma: Yes. Field welding of current distribution members is simple and convenient. It is also easy to weld the entire sheet at several locations. However, ] or 2 places That's enough. In the end, the mesh was easy to install, the catalyst image was supported, and the magnification was high. Combined with the low cost of the mesh, this system is extremely cost-effective. The diagram shows a diamond diagram of a greatly expanded valve metal mesh used in the present invention. It indicates a shape unit.

Figure 2 shows the valve metal welded to the mesh node along the current distribution member 2LWD. It is part of the mesh.

Figure 3 tr! , is an enlarged view of the mesh node, showing twice the thickness of the node.

FIG. 4 is a perspective view showing the installation method on a steel-reinforced concrete floor.

The metals of the valve metal mesh are titanium, tantalum, zirconium and niobium. Suitable metals for mesh include not only the elemental metals themselves, but also these metals. It includes alloys of metals, alloys with other metals, and intermetallic mixtures thereof. Ru. Titanium is of particular interest because of its roughness, corrosion resistance, and availability.

Metals useful as sheet materials for expanding metal sheets into meshes include It will almost always be an annealed metal. Alternatives to annealed metals that can be used in these applications A table example is grade 1 titanium, ie, low brittle annealed titanium. Low brittleness The characteristic is that when the mesh is prepared by expanding a metal sheet, the sheet is 20% This is necessary because it must have an elongation exceeding . This elongation occurs at room temperature. For example, at 20°C: measured elongation and thickness 0.0635c! n(0,02 Percent elongation measured on a 5 cm (2 inch) sheet of 5 cm (2 inch). push Expansion metals with a hardness of less than 20% are too brittle and may cause harmful strands to expand. It is difficult to make the mesh into a useful mesh.

For enhanced strand breakage prevention, the metal used in the expansion should be approximately 24% or more , and virtually always does not exceed about 40%. It's advantageous. Metals like aluminum are not considered for uninvented metals. And it's not useful either. Aluminum is particularly unsuitable due to its lack of corrosion resistance. useful Annealing is also important for metals. For example, Mental Metals has an annealing sheet of 37 I am not expecting an elongation of about 40%, but it is not annealed (in the form of Since the elongation is only 3 to 5%, it is not possible to use all do not have. Furthermore, alloying increases the brittleness of elemental metals, so be careful when choosing a suitable alloy. If you don't make deep choices, you won't line up. For example, titanium-palladium alloy is grade 1 It is commercially available as Tan and contains about 0.2% by weight of palladium. However, pressing at room temperature costs more than about 207 cents, and although it is expensive, Can be used in blunt form. Furthermore, when considering alloys, the selected characteristics The expected corrosion resistance of constant alloys is also taken into account. For example, for grade 1 titanium, it is usually 0. ．． It is not available with a total iron content of 2% by weight. However, excellent durability In terms of eating quality, grade 1 contains less than about o, osi and ξ-cents of iron. Titanium is also available. Generally, this low iron content metal is highly corrosion resistant and therefore Suitable for applications such as

A metal mesh is then prepared entirely directly from the selected metal. Extending the life of metal mesh To obtain the best roughness, expand the mesh from the valve metal sheet or coil. It is preferable to let it stretch.

However, other types of mesh can be used instead of expanded metal mesh. It is Noh. For such an outbuilding mesh, thin gold J14 ribbon is wavy. Individual cells, for example honeycomb-shaped cells, are made from their ribbons by mutually resistive melting. There is something.

A slitter or corrugator is useful for preparing metal ribbons and provides large porosity materials. Automatic resistance welding could be used to prepare the sosh. With suitable expansion technology, A mesh of interconnected metal strands can be directly obtained. Typically Be careful and select all the metals in the appropriate press (- if you use such an expansion technique) A useful mesh with no broken strands will be prepared. Furthermore , an extremely useful sintered oblique pulp metal that has both desirable roughness and required elongation properties. So, when installing the mesh, stretch the expanded metal to some extent and fit it together. Can be done.

Is this property an anti-corrosion treatment for uneven substrate surfaces or forms? Useful when applying ・By applying a mesh with such stretchability, it is easy to corrode. is prevented. Generally, Great 41 titanium mesh contains up to about 10% It has stretchability.

Furthermore, the mesh obtained in this way has a mesh width within the general plane of the mesh. It is not expected that it can be bent around bend radii in the 5 to 25 fold range.

If the mesh is extended from a metal sheet, interconnected metal strands l −″′(ζ, has a thickness corresponding to that of the original flat sheet or coil. Typically, this thickness will range from about 0.05 cm to about 0.125 cm. It is surrounded by Using a sheet having a thickness of less than about 0.05 centimeters, Not only will a harmful number of strands break during the expansion operation, but the handling The material becomes too soft to the point of difficulty. Seas larger than approximately 0.125 cm This is avoided for economic reasons.

As a result of the expansion operation, the strands meet each other at nodes with a thickness 2 that is twice the thickness of the strands. Link. That is, the node thickness is approximately 0.1 cm to approximately 0.25 cm. It is in the range of centimeters. Furthermore, the nodes of the special mesh after expansion are complete or Virtually completely unangular. This means that the thickness of the node is penetrated (the surface returns to width). It means completely or substantially completely perpendicular to the horizontal plane of the tush roll.

When considering the preferred valve metal titanium, the weight of the mesh is the mesh square meter. Usually in the range of about 0.05 kilograms to about 0.5 kilograms per bottle. This range The box is based on titanium (as an example), but it is within the useful range of general valve metals. However, it is useful. Titanium is the valve metal with the lowest specific gravity.

Based on this, the useful range of various pulp metals is calculated based on their specific gravity relationship with titanium. can be done. If we look at titanium again, it is about 0.0 mesh per square meter. Weight less than 5kg and 1M, distributes proper current for cathodic protection frequency would be insufficient. On the other hand, major prizes exceeding approximately 0.5 kg per meter of flat blade. will almost always be non-subject to the services intended by the mesh.

Next, a metal sheet or coil of appropriate thickness is expanded at a magnification of 10 times or more, preferably 1 Expand by 5 times or more and manufacture a sheet.

A useful mesh can be found even when the metal sheet is expanded by a factor of up to 30 times its original area. It is important to manufacture. Expansion ratio of over 30:1 and over 20% In the case of annealed valve metal with elongation, the mesh strands are broken. It ends up. On the other hand, an expansion factor of less than about 10:l (d1 does not increase the This leaves useless metal behind. Regarding this point]-1 Efficient and economical shade protection In order to get all the tributes, the porosity of the served exno must be greater than or equal to

The most preferable porosity of expanded mesh is about 90% or more. , 92-96% or even more, sufficient metal and economical current distribution can be provided. With such a porosity, the metal strands with a large number of nodes By connecting and providing redundancy to the current flow path that passes through all the meshes, it is possible to provide redundancy during installation or use. Even if there are many breaks in the regular strands, such as those that occur in (The effective current is distributed.In the range of expansion factor 1. Almost always compatible with about 500 to about 2000 nodes per mesh square meter. The network of interconnected strands 9 is suitable for metal strands. Provides significant redundancy. Approximately more than 2000 nodes per square meter of mesh Number is uneconomical: Yes. On the other hand, the interconnected nodes per square meter of mesh are approximately If it is less than 500, there is insufficient redundancy within the mesh.

The weight range of the mesh is as above, and the net thickness is about 0.05-0.125. centimeters, a strand within such a thickness range is approximately 0.05 centimeters. It is expected to have a width dimension of 1 cm to about 0.20 cm. Con For cathodic protection in cleats, the total surface area of the interconnecting metals or strands The total surface area, including the sum of the surface areas of the grid and the nodes, is the area covered by the metal mesh. 1: Yes, it will be about 10% to about 50%. This surface area is ν Since E is the total area given by all four sides of the strand with a square cross section, the porosity is 90. Even when the mesh surface area is 10 ξ - cents, it is much more suitable for dogs. It may happen. This area is referred to as "metal surface area" or "metal surface area" in this application. to be called. If the total surface area of the metal is less than about 10 percent, the resulting On the other hand, the surface area of the metal If the amount exceeds approximately 50%), the total metal supply of nutrients that do not increase the anticorrosion effect will be It's going to be a big deal.

The mesh obtained after expansion can be easily transformed into a coil shape and stored. for transport or further manipulation. Titanium, a typical pulp metal, has a diameter of 20 cm. Rolls can be prepared that have an outer diameter with a hollow inner diameter of more than a millimeter. Metsushi range from about 40 meters to about 200 meters, preferably up to 100 meters. When the mesh is prepared to a certain length, the mesh can be appropriately wound to form a coil. . In the case of titanium metal, such rolls can weigh around 10-50 kg. However, for ease of handling, special arrangements are made for subsequent coatings and cathodic protection. The weight is less than 30 kg so that it can be easily handled outdoors when stored.

In this greatly expanded pulp metal mesh, the pore shape of the mesh is It is most typically formed as a diamond T or Z-shaped hole. This kind of “da” The diamond shape is about 4 to about 9 cm, preferably about 6 to about 9 cm. rn's design length 'B2 (long Wa7 of design, LW L3) (longer LWD is also possible) and approximately 2 to 4 centimeters, Preferably a short wa of about 2.5 to about 4 centimeters. All features include a hole having a yofdesign, SWD).

For special applications in concrete cathodic protection, L V/D exceeds approximately 9 cm. If the diamond size is too large, undesirable strand breakage will occur and voltage loss will be undesirable. It becomes a territory that does not exist. If the SWD is less than about 2 centimeters or the LWD is about 4 centimeters, In this application, it would be less than 100 cm, which would be undesirable compared to the desired cathodic protection. It becomes uneconomical to provide as much metal as necessary.

Refer now to FIG. 1 in more detail. Many diamond shapes? Does the sheet have The individual diamond shapes of these are generally designated 2. In this shape, connect parts (nodes) ) form IO: from strands 3 joining at 4. Strands as shown 43 and the connecting part 4 form a diamond hole with a long design path in the horizontal direction. There is. Design shorts are in the opposite vertical direction. interconnected metal strands When referring to the surface area of This surface is approximately 10% or more of the total measured area of dead metal. The product is the total area around the strand 3 and the coupler 4. For example, a strand with a square cross section In case 3, the surface area is four times the area of which only one side is shown in the figure. Sunawa In Figure 1, the strand ``3'' and its connecting portion 4 look thin, but the expansion Provides a surface area of 20 to 30% of the total measurement area of dead 5 metals. It's easy. The "area of the mesh" in Figure 1, for example, the square of the mesh in this application. The area in meters is the area inside the imaginary line drawn around the drawing.

The inner area of the diamond in Figure 1 is the area between the strand 3 and the connecting part 4. This is referred to as the "Guillamondo foramen." The diamond hole is LWl) length and S’ w 1) It is an area having a length. For convenience, this is referred to as "void J" in this application. The taste described based on the entire metal area surrounding such areas and voids is called "void". It is called the ratio J (void fraction). Figure 1 shows the finger fit, so far As discussed above, the metal mesh used in the present invention has a large porosity. has. The shape shown in the figure is diamond shape 1. Can be used to achieve large porosity.

Now, look at Figure 2. How many from the valley strands 22 and their interconnections 25? The individual diamonds)'21 are formed and provide diamond-shaped holes kf%. Ru. One row of diamonds 21 is interconnect 25 of strand 1-922: It is joined to a metal strip 23, which has a diamond shape. It runs along the LWD of This assembly is held together by spot welding 24. , each strand connection part (note'-) 25 located below the strip 23 is Welding is performed by cut welding 24. The commonly used welding is electric resistance welding, which The welding method is almost always just spot welding from an economic point of view. however , and other similar welding temporary assemblies, such as roller welding, are also conceivable. This welding Rigid interconnect for good electrical conduction between trip 23 and strand 22 I can belong. In particular, as can be seen by looking at Figure 2, the strand 22 and the connecting portion 25 are Qualitative flat shape? Take. Purpose: When used, such expressions are particularly applicable to large size Tush sheets are generally coiled or rolled for storage and handling. It is in a flat state, but when used it is folded back into a ``substantially flat'', four-sided or shaped This means that it can be made into a substantially flat cedar shape. Furthermore, the connecting portion 25 It has twice the thickness of the strand, so even when the width is fully returned and flattened, The substantially planar or planar shape has a rigid connection.

Next, referring to the enlarged view in Figure 3, the node has a thickness (2T) twice that of the strand. To have p: to understand. That is, the individual strands are about 0.12 A lateral depth or thickness (T) not exceeding 5 cm and approximately 0.20 cm Width (W) in meters? have

Expanded 9 metal mesh can be touched before or after taking mesh form. A catalytic active material is coated thereby forming a catalytic anode structure. Usually before this , a cleaning operation, such as a degreasing operation, is performed on the pulp metal mesh. This horn Leaning operations also include electrochemistry, as is often the case in the field of valve metal preparation. It will be done. Pulp metal, also referred to herein as "film-forming" metal, refers to pulp metal surface The anode cannot be used as an anode unless it is accompanied by an electrochemically active coating that prevents the passivation of It is also well known that this is not possible. This electrochemically active coating is made of platinum or from other platinum group metals or platinum group metal axillides, magnetite. , ferrite, cobalt spinel or mixed metal oxide coatings, electrochemical It can be any of the active oxide coatings that have been developed for use as anode coatings in industry. stomach. The anode coating is a solid solution mixture of film-forming metal oxides and platinum group metal oxides. Metal oxides are preferred for loads to extend the corrosion protection life of concrete structures. suitable.

For this long-term use, the expanded metal mesh will draw approximately 2 square meters. The coating should contain from 0.05 to about 0.5 grams of platinum group metal. platinum Group metals of less than about 0.05 grams result in long-term immobility of the valve metal substrate. or selectively activate the anodic reaction at a sufficiently low unipolar potential. This results in a coating with insufficient electrochemical activity to promote. On the other hand, Expanded Even if more than about 0.5 grams of platinum group metals are present per square meter of valve metal, , the cost will only increase, and no commensurate improvement in anode life will be observed. This message Mixed metal oxidation F@coating in specific embodiments of TSUSH, for oxygen evolution reaction Highly catalytic, chlorine and hypochlorite are eliminated even in chloride-contaminated concrete environments. Platinum group metals or mixed metal oxides used in zero coatings that do not generate oxalates (d, generally U.S. Pat. No. 3,265,526; U.S. Pat. No. 3,632,4.98; No. 3,711,385 bud 6 and one or more of the same No. 4,528,084. It's like being told. More specifically, such platinum group metals include Platinum, palladium, rhodium and ruthenium, or alloys of these and others This includes alloys with other metals. Mixed metal carbides contain negative compounds of these platinum group metals. A combination of one or more metals and one or more oxides of pulp metals or other non-noble metals is included. Included. From an economic point of view, the method disclosed in U.S. Pat. No. 4,528,084 Such a coating is preferred.

For concrete corrosion retardation applications, a current distribution member on a metal mesh is used, as shown in Figure 2. is connected to the metal strip 23 of. Such parts are almost always pulp metal. Yes, the same gold that is used exclusively for Exno Metallic alloys or intermetallic mixtures are preferred. This current distribution member is made of metal mesh. Must be firmly fixed. This is done by welding as described above.

Furthermore, welding can be carried out through the coating.

That is, the coated strut l) is placed on the coated mesh and the coated surfaces are brought into contact. Even if you touch it, welding will proceed easily. This strip is connected at every node. It can be welded in multiple ways, and the current is evenly distributed by the blade. Cut this part into a mesh piece. It is usually placed approximately 30 meters along the Function.

In cathodic protection applications for concrete, even buried parts of current distribution members may be It is important to have the same electrochemically active covering syllable as bametshu. ! cover weight Regarding current distribution components, the same considerations as those given to meshes are applied to current distribution components. It is also important. This member is connected to all meshes before the member is coated: You can also do it later. The current distribution member is then connected to the current conductor outside the concrete environment. let This current conductor is outside the concrete and does not need to be 8N. example For example, in the case of a concrete bridge deck, the current distribution member connects the floor through the hole where the current conductor is located. It is a rod that extends below the surface. In this way, all mechanical current connections @ finish 1x8 on the outside of the concrete structure, so it is easy to access and carry out repairs when necessary. can be done. Connections to current distribution rods outside the concrete are made using bolted screws. By conventional mechanical means such as wire-lug connections.

A mesh fabricated according to the specifications below was used in the installation example described below. .

Assembled Titanium Grade 1 0-Le Width 112.5cm (45 inches) Length 75~150m (250~ to 500 ft) Weight 11.7 to 9/100i, (26 bon ton 1000 Feet) Bending radius: 0.24 cm, (732 inches) Bending on mesh surface Radius: 15m (50 feet) Type 2 pieces 1 shot Assembled titanium gray) J1 0-le width 122cm, (4 feet) length 75-150m (250-150m) 500 Fee 1-) Weight 20.2Ki100rr? (45,1”nt’/1 000 feet) bending radius 0.24 cm (3/32 inch) concavity on mesh surface 15m (50ft) Recommended Maximum Positive - Concrete Surface Electricity Gives good oxygen selectivity at flow densities of approximately 100 m’A/m’ (10 mA/ft). These meshes are then coated with a mixed metal oxide containing a mixture of metal oxides. The precious metal loading of this catalyst is Approximately 0.05 to 0.59 mesh/m². Width approx. 1.25cm (0 , 5 inches) and a thickness of approximately 0.1 cm (0,04 inches) made of the same titanium. A similar thin catalytic coating is applied to the current distribution member made from the trip.

Apply coating mesh to prevent corrosion of concrete floors, concrete foundations, etc. is simple. A significantly expanded chamber with a suitable electrochemically active coating A roll of Lube metal mesh (hereinafter also simply referred to as "Anode J"), this Unwind on a similar floor or foundation. Metush? The means of fixing to the foundation is metal mesh. Useful for bonding meshes to concrete and does not affect the properties of the mesh as an anode. Anything that doesn't give you money will do. Non-conductive retaining members are usually useful It is. For economical reasons, such retaining members may be made of plastic nails or studs. ku has an advantage. Examples include polyvinyl halides and polyolefins. Tic is useful. Drill this plastic fixture into the concrete. Insert into the drilled hole. This type of holder has a dog-shaped head, which makes it difficult to hold the mesh. Place the strand under the head to hold the anode completely. Or partially on the retainer. Groove cut, mesh slot located directly above the drilled hole in the concrete. Tran) You can also try to grab the pawo.

After placing the positive hw, the ion conductor is placed in close contact with the concrete using the holder. Completely cover the anode structure with a conductive overlay. This kind of overlay A further strengthens the contact between the anode and the concrete base. Useful ionic conductivity Overlay includes Portland cement and polymer modified concrete be done.

In a typical operation, about 2 to about 6 centimeters of Portland cement or Latex-modified concrete is placed over the anode (a thin overlay is particularly desired). If the Cover completely. The anode extract/ξnded valve metal mesh base material is metal reinforced. It also has the additional advantage of functioning as a means, thereby allowing the mechanical Improve properties as well as useful life. Metal mesh anode structures are used in school areas, pillars, etc. Materials well known in the field of repair of basic concrete structures as well as techniques well known in the field. Can be used at ℃.

FIG. 4 shows a highly expanded titanium steel of the above specification, generally designated 40. This is a diagram showing the installation on a reinforced concrete floor. Introduction to floor steel reinforcement The suitability for preservation by sacrificial corrosion and cathodic protection was determined using conventional techniques including suitable potential measurements. and test it.

Lay the mesh roll 32 (previously with the catalyst coated titanium current distribution strip 2). Three pieces are placed at appropriate intervals across the entire floor 40. type 1 mesh When installing, the current distribution member 23 should be approximately 1.8 meters long (6 feet). (g)) are arranged with increased spacing between them. At a certain position (not shown), the strip 23 extends to connect to the power supply via a hole in the floor 40 (-). Type 1 mesh In this case, the distance between the power supply positions is approximately 7.2 meters (24 feet) in the width direction of the mesh. ). For Type 2 meshes, this width spacing is approximately 9.8 meters (3 2 feet).

The first anode 30 in FIG. 4 has already been unwound from the roll and laid down, Stretch approximately 5-10% and insert plastic clips 3 into holes drilled in the floor. 1, it is fixed to the floor 40 by inserting. After fixing it in this way, The mesh 30 is connected to the mesh node 25 (second spot weld (as shown in the figure). For this welding operation, the copper rod 35 is 0 and below the strip 23. In this way, sufficient welding current is applied to the melt. Leads to the junction. All nodes across the mesh width or selected f? ,,number of After welding the nodes, take out the rod 35 from under the mesh as shown in Figure 4. so that the mesh 30 is placed under the strip 23 in a position to receive the next roll. Ru.

As shown in the figure, adjacent sheets of the unwound mesh 30 are exposed at a distance. ing. Provides uniform cathodic protection to the underlying steel even at distances up to approximately ILWD length. It is possible to increase the total thickness of the fruit. This is done by overlapping the ends of the mesh, e.g. to about ILWD length or more. Can also be done.

In this way, all the rolls of mesh are laid out, and the shape is adjusted to fit the deformed shape of corners, edges, etc. and placing the bed 40 containing the mesh 30 in a thin layer of cement-based grout. . Next, use approximately 44-6C Portland cement or polymer modified concrete. The ionically conductive layer is applied by injection or spraying.

During installation, that is, after laying and fixing the mesh 36, work on it or It is possible to drive a car on the mesh, there is little risk of damaging the mesh, and it is not recommended to replace it. Even if some strands happen to break, the mesh has great redundancy. Therefore, it does not have a negative effect on cathodic protection.

Procedural amendment (formality) September 1986 1.Display of the incident PCT/US8610093B 2. Name of the invention Steel reinforced concrete 1. Cathodic protection system for structures and its installation method 3. Person who makes corrections Relationship to the incident: Applicant address Name Eltic Systems Corporation 4, Agent Address: Room 206, Shin-Otemachi Building, 2-2-1 Otemachi, Chiyoda-ku, Tokyo 5. Date of amendment order: August 25, 1988 ■Date of sending) 6. Subject of amendment Translated international coordination report of the specification and claims, typewritten ANNEX To, P, E I) iTERTh! AT:0NAL 5EARC HRE? QRT ON! NTER,’lAT:0NAL APPIJCATIC N No, PCT, "JS 86100933 (SA 131'?61 So. −−+e−−−−−+Snow-Arm−Middle−Gallery・＋＋＋＋−−−−−Cap −Ichimunoun−−Gaya A rumor-----A fairy tale--a story...--Hiruso-

Claims (36)

[Claims] 1. Applied current buried in ionically conductive overlays on concrete structures In cathodic-protected steel-reinforced concrete structures consisting of anodes, The anode has a certain shape of air defined by the network of valve metal strands. consisting of one or more seats of valve metal mesh having gaps, the valve metal mesh the surface of the valve metal mesh carrying an electrochemically active coating; The upper sheet extends substantially continuously over the entire area of the structure to be protected and is suspended from each other. Having a discontinuous area larger than twice the maximum dimension of the mesh void in two perpendicular directions , and the anode includes a current distribution member for supplying current to the valve metal mesh. Steel-reinforced concrete treated with cathodic protection, characterized by containing one or more of the following: Structure. 2. If the mesh is at a magnification of 10 times or more, preferably 15 to 30 times, the mesh is substantially Diamond-shaped voids and about 500 to 2000 pieces per square meter of mesh. to provide a continuous network of valve metal strands interconnected at nodes. Claim 1 comprising a seat of expanded valve metal. Structures described in . 3. the one or more current distribution members are provided with an electrochemically active coating, and claim 1, which is a strip of valve metal metallurgically bonded to the mesh; Structure according to item 1. 4. Connect multiple current distribution strips to the wire at intervals of approximately 10 to 50 meters. 4. A structure according to claim 3, wherein 5. Joined to a common current distribution strip or to the seat of two or more valve metal meshes 4. A structure according to claim 3, wherein the structure is formed of a sheet and extends across the sheet. 6. Spot welding the current distribution strip to the mesh node The structure according to item 3, item 4 or item 5. 7. Fasteners inserted into drilled holes in the structure connect the mesh to the concrete structure. The structure according to claim 1, wherein the structure is fixed to. 8. The method according to claim 1, wherein two or more mesh sheets overlap each other. Structure. 9. The cutout area where a mesh sheet of 1 or more borders an obstacle on the structure. The structure according to claim 1, having: 10. Claim 1, wherein adjacent sheets of the mesh are welded together. Structure. 11. Apply a cement-based adhesive grout onto the mesh and 7. The structure of claim 1, wherein the structure applies an on-conductive overlay. 12. Provides cathodic protection current with current density up to 100 mA per m2 of strand surface area The method according to claim 1 further comprising a power source connected to the current distribution member for supplying the current. Structures listed. 13. A common current distribution strip extends through holes in the floor to power supplies located below the floor. a common current distribution strip extending across the sheet, characterized by A concrete floor covered with a series of long, side-by-side sheets of mesh. , the structure according to claim 12. 14. One or more reference electrodes buried near the steel to be protected in the concrete and wherein said reference electrode is a sheet of catalyst-coated valve metal. , the structure according to claim 1. 15. A concrete column wrapped in mesh and an ionically conductive overlay. A structure according to claim 1. 16. The structure is a bridge deck, parking lot floor, pier, or support for such a structure. The structure according to claim 1. 17. at the current density effective for oxygen evolution on the surface of the coated valve metal mesh. , consisting of supplying a continuous or intermittent current to the valve metal mesh anode. , A method of cathodic protection applied to a structure according to claim 1. 18. -When many individual strands are broken when connected by many nodes. In addition, the redundancy that distributes the effective current throughout the mesh is added to the current carrying path via the mesh. The valve consists of a network of metal strands, which are wound into rolls. The surface of the valve metal mesh carries an electrochemically active coating. preparing a roll of flexible sheet of mesh; - coated valve metal mesh; Unroll the shroud and install it according to the shape of the concrete structure to be protected against corrosion. - fixing the valve metal mesh to the structure; and - fixing the valve metal mesh to the structure; embedding the metal mesh within the ionically conductive overlay; Applied current anode of cathodic protection system for steel reinforced concrete structures consisting of How to install coated valve metal electrodes as. 19. The valve metal mesh has a ratio of 10:1 or more, preferably 151 to 30:1. At magnification, substantially diamond-shaped voids and mesh approximately 500 per square meter Continuous network of valve metal strands interconnected with ~2000 nodes Consists of an expanded valve metal seat expanded to provide a A method according to claim 18. 20.1 or higher on the mesh before installation according to the shape of the structure. 19. The method of claim 18, wherein metallurgically joining is performed. 21. Unwind the mesh on the structure and remove the coated valve metal strip. The sprue is metallurgically bonded to the unwound mesh and a current is supplied to the mesh. 19. A method as claimed in claim 18 for providing a current distribution member for. 22. Connect current distribution strips to the mesh at intervals of approximately 10 to 50 meters. 22. The method of claim 21. 23. Unwind two mesh rolls side by side to create a common transverse current distribution section. 22. The method according to claim 21, wherein the connection is made using a material. 24. Before installing the mesh, at least one placing the upper current distribution strip on the structure; Unwinding the roll and joining it to the current distribution member(s) , then unwind the second roll of mesh on the structure and attach it to the current distribution member ( 24. A method as claimed in claim 23, comprising joining (single or plural). 25. Claim 1 spot welding the current distribution strip to the nodes of the mesh. The method according to item 21, 22, 23 or 24. 26. Drilling holes in a structure and inserting fasteners to hold the mesh. 22. The method according to claim 21, wherein the mesh is fixed to the structure by. 27. Do not place adhesive between the mesh and the structure or between the fastener and the structure. According to claim 18 or 26, the mesh is fixed to a structure. How to put it on. 28. Claims encompassing stretching the mesh on the structure before fixing The method according to paragraph 18. 29. A claim in which two or more mesh rolls are arranged in an overlapping manner and unwound. The method according to item 28 or item 23. 30. Cut the unrolled mesh to fit around the obstruction on the structure. 19. The method of claim 18, comprising: 31. The end of the roll after unwinding the mesh overlaps the adjacent part of the mesh. 22. The method of claim 21, comprising electrically connecting. 32. A method according to claim 18, in which adjacent parts of the mesh are welded together. . 33. Fixed valve gold on the structure before placing the ionically conductive overlay. Claim 18, wherein a cement-based bonding grout is placed on the mesh. Method described. 34. A mark on a valve metal mesh installed by the method set forth in claim 18. Cathodic-protected steel reinforced concrete structures with current-carrying anodes. 35. Claims where the structure is a bridge deck, parking lot floor, pier or support therefor. Structure according to paragraph 34. 36. The coated valve metal mesh electrode is subjected to the method of claim 18. Therefore, the installation, the connection of the electrode as an applied current anode and the mesh It is possible to supply current at a current density of up to approximately 100 mA per m2 of surface area of the strands. A method of applying cathodic protection treatment to steel reinforced concrete structures.