JP6576525B2 - Galvanic anode - Google Patents

Description

The present invention is related to marine steel pipe pile to be installed in or river, sacrificial galvanic anode attached to a metal structure such as a steel sheet pile.

As a corrosion prevention method for metal structures such as steel pipe piles and steel sheet piles installed in the ocean or rivers, a metal having a lower potential than the metal structure (galvanic anode) is connected to cause corrosion protection current to flow. There are known galvanic anode methods for preventing corrosion of metal structures caused by water and water. In this galvanic anode method, underwater welding is generally used as a method of attaching a galvanic anode for cathodic protection to a metal structure.

  However, in recent years, a case has been reported in which a steel sheet pile structure is broken from a part welded underwater by a large-scale earthquake (magnitude 7 or more). It has been clarified by investigations and tests that the cause of this is a decrease in strength (embrittlement) of the weld due to underwater welding (Non-Patent Document 1). As a countermeasure to this problem, the standard for hot-rolled steel sheet piles (JIS A5528) was revised, and the standard for hot-rolled steel sheet piles for welding (JIS A5523) was newly established. However, since many structures constructed so far are those before the revision of the standard, development of fixing methods other than welding is still desired.

For this reason, in recent years, a method has been proposed in which a current-carrying anode for cathodic protection is attached to a metal structure such as a steel sheet pile using a magnet (Patent Document 3). In this fixing method, magnet rubber sheets are attached to both ends of a cored bar that penetrates a current-carrying anode for cathodic protection made of a lump of aluminum alloy or the like, and both ends of the cored bar are attached to a steel sheet pile with a magnet rubber sheet. The core metal and the steel sheet pile are made conductive using a metal plate for electrical conduction. However, the galvanic anode for cathodic protection is heavy and the galvanic anode for cathodic protection of metal structures that are constantly immersed in seawater is generally subjected to the action of waves and tidal currents. In some cases, the electrogalvanic anode for cathodic protection cannot be firmly fixed to the metal structure and may be peeled off by high wave waves.

Therefore, the use of strong magnets using rare metals such as neodymium magnets has been proposed (Patent Documents 1 and 2). Magnets using rare metals generally have a problem that they are fragile and easily broken by impact. On the other hand, since it has a strong attracting force, the magnet is attracted to the steel sheet pile with a strong force when it is attached to the steel sheet pile, and there is a risk of breaking the magnet. Moreover, there is a problem that after it is adsorbed, it cannot be easily removed by hand and cannot be easily removed. Therefore, a bolt for jacking up that can protrude to the steel sheet pile side than the edge of the magnet yoke is provided, and when the galvanic anode for cathodic protection is to be attached to the steel sheet pile, the bolt is on the steel sheet pile side than the yoke edge. By making the bolt tip contact with the tip of the bolt earlier than the yoke, the yoke and the steel sheet pile are gradually brought closer to each other by reducing the projecting amount of the bolt, and the yoke is shockedly attracted to the steel sheet pile. So that there is nothing to do. And when the current-carrying anode for cathodic protection melts and disappears, the magnet is removed from the steel sheet pile by gradually pulling the magnet yoke away from the steel sheet pile by protruding the jackup bolt toward the steel sheet pile. The metal core and the magnets at both ends are removed and replaced with a new galvanic anode for cathodic protection.

JP 2012-31474 A JP 2008-274359 A JP 2001-355085 A

Tsutomu Fukute, Masami Abe, Hiroyuki Hasegawa, Shiro Matsuda: Material research on fracture mechanism and fracture mode improvement of steel sheet pile structures welded underwater, Report of Port Engineering Laboratory, Vol.36, No.4, p43-68 (1997)

  However, since magnets using rare metals are very expensive, there is a demand to reuse them as they are without being removed. In other words, there is a desire to replace only the anode part by reusing it like a stud bolt while it is attached to the steel sheet pile once it is attached. However, since the work in seawater is affected by waves and tidal currents, the electroprotective galvanic anode for the body of the worker (submersible) is pressed against the metal structure even during the work. Unlike the work on land, it is extremely difficult and may not be able to work because it is separated, further left and right, pushed up and down. In particular, removing the bolts or nuts in seawater or underwater, once removing the core of the current-carrying anode for electro-corrosion protection from the bolt on the yoke side of the magnet and replacing it with a new current-carrying anode for electro-corrosion I will master it. It is difficult and troublesome to align the bolts on the yoke side through the bolt holes of the core of the cathodic protection anode in the seawater subjected to the action of waves and tidal currents, and tighten the removed nuts to the bolts again. Therefore, there is a demand for easy replacement by all means because it is underwater work.

The present invention is state, and are not meet such demands, and an object thereof is to provide a sacrificial flow Denhi pole that enables the replacement of sacrificial galvanic anode easily in water.

To achieve the above object, a sacrificial galvanic anode fixing structure according to a first aspect of the present invention, a bolt which is fixed to the metal structure to be installed in the water, such as oceans, rivers, screw contrast A nut, a galvanic anode main body, a core bar penetrating the galvanic anode body and projecting both ends out of the galvanic anode main body, and both ends projecting from the galvanic electrode main body of the core metal An insertion slot that penetrates in the thickness direction of the cored bar and opens at one end to the periphery of the cored bar in a direction perpendicular to the gravitational action direction of the cored bar so that the bolt can be introduced from the side an open hole to form a and at least provided with a vertical engaging part for the bolt engages in both directions perpendicular to the gravitational direction as well as the gravity acting direction, relative engagement of the bolt from the insertion opening of the engagement groove is inserted into the groove, pull of gravity acting direction on the bolt in the innermost part of the vertical engagement portion Cored by tightening the nut over the state is to be fixed to the metal structure.

Here, the engagement grooves are preferably formed at both ends of the cored bar in the same direction, and more preferably vertically engaged with a horizontal engagement portion in a direction perpendicular to the direction of gravity action communicating with the insertion port. This is to form an L shape in which the part is arranged on the upper side.

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According to the onset bright, marine and galvanic anode body in company core from wants addressed the insertion opening in the engaging groove of the core relative to the fixed bolts metallic structure installed in the water, such as river gold by horizontally moving, because the engagement in both the horizontal direction in which the bolt and the core introduced into the vertical engagement portion of the engaging groove perpendicular to the gravitational direction as well as the gravity acting direction, the bolt and nut Even when the core metal is not sufficiently fastened to the base member, the core metal and the galvanic anode main body will not fall off the base member due to waves or tidal currents. In addition, when replacing the electroplating anode for cathodic protection, the cored bar can be easily moved by sliding the cored bar along the steel sheet pile with the nut loosened to such an extent that the cored bar can be moved. Can be removed. Then, when replacing the electrogalvanic anode for cathodic protection, slide the new cathodic anode for cathodic protection so that the bolt is introduced from the insertion port at the edge of the core bar, so that the bolt reaches the vertical engagement portion. The cored bar can be hooked and supported by the shaft part of the cored bar fixing tool. Thereafter , the current-carrying anode for cathodic protection can be fixed at a predetermined position simply by tightening the nut.

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In addition, according to the present invention, the core metal of the galvanic anode for cathodic protection is attached to the metal structure by tightening the nut with respect to the bolt fixed to the metal structure, for example, the steel sheet pile. Since the exchange operation of the galvanic anode is merely the operation of tightening or loosening the nut and the operation of sliding the metal core to the side, the metal core can be easily detached.

Further, when the engaging grooves are formed in the same direction at both ends of the core bar, the movement of both ends of the core bar with respect to the bolt is the same, so that the core bar can be easily attached and detached.

Further, when the engaging groove is formed in an L shape, the cored bar can be removed from the bolt by simply lifting the cored bar in the vertical direction with the nut loosened and further laterally moving it. Also, when installing a new galvanic anode for cathodic protection, align the bolt and the insertion hole of the metal core engagement groove at the same height, then move the metal core horizontally and insert it to the end. When the cored bar is released at this time, the entire anode including the cored bar settles due to gravity and is hooked at the deepest part of the vertical engagement portion, so that the mounting operation becomes extremely simple.

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It is a figure which shows one Embodiment of the electroplating anode for cathodic protection of this invention, (A) is a front view, (B) is a side view. It is a figure which shows the relationship between the metal core of the cathodic anode for electrocorrosion prevention shown in FIG. 1, and a magnet board, (A) is the back view seen from the magnet adsorption | suction surface side, (B) is a side view. It is description which shows the mounting state of the metal core with respect to a magnet board, (A) shows the state just before engaging the engagement groove of a metal core with the bolt for metal core fixation, and (B) immediately after engaging. (C) shows a state where the cored bar is dropped into the vertical part of the engaging groove. It is a figure which shows other embodiment of the electroplating anode for cathodic protection of this invention, (A) is a front view, (B) is a side view. FIG. 5 is a partially enlarged side view showing a relationship between a cored bar, a reinforcing plate, and a magnet board of the cathodic protection galvanic anode shown in FIG. 4. It is a figure which shows other embodiment of the electroplating anode for cathodic protection of this invention, (A) is a front view, (B) is a side view. (A)-(E) are explanatory drawings which show other embodiment of the engaging groove of a metal core.

  Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the drawings.

  FIG. 1 shows an embodiment of a galvanic anode for cathodic protection according to the present invention. This galvanic anode for cathodic protection is fixed to a metal structure using a high holding force magnet. The galvanic anode supported by a base member 3 including a high holding force magnet 6 and a cored bar 2. The main body 1 is detachably connected with a metal core fixture 4 and fixed to a metal structure (not shown) such as a steel sheet pile.

As shown in FIGS. 1 and 2, the current-carrying anode for cathodic protection of the present embodiment includes a trapezoidal current-flow anode body 1 and a core protruding from the side surface of the longitudinal end portion of the current-flow anode body 1. It is comprised with the gold | metal | money 2, and it is provided so that the both ends of the metal core 2 may be attached to the metal core fixing tool 4 of the base member 3 attracted | sucked to a metal structure. Incidentally, galvanic anode body 1 is a metal such as zinc becomes less noble with respect to the metal structure to be anti-corrosion, magnesium, or those consisting or aluminum alloys, in general, aluminum alloy ingots Etc. are used.

  Here, the base member 3 includes a high holding force magnet, and is fixed to the metal structure by the attraction force of the high holding force magnet, and is on the side opposite to the side attracted to the metal structure. Any structure may be used as long as it has the metal core fixture 4 on the surface, and the shape and arrangement of the magnet and the case structure are not limited to a specific structure or shape, and any structure / form may be used. For example, the base member 3 of this embodiment is configured in the form of a magnet board as shown in FIG. 2, and a magnet 6 having a high holding force is accommodated in a box-shaped case 7 that also serves as a yoke. The metal core fixture 4 is provided so as to protrude to the surface opposite to the suction surface (surface on the steel sheet pile side).

  The metal core fixture 4 has a shaft portion 4 a that penetrates the metal core 2 and a head portion 4 b that sandwiches the metal core 2 between the base member 3, and the head portion 4 b can approach and separate from the base member 3. The cored bar 2 can be tightened. This cored bar fixing tool 4 can be of any structure as long as it is a fastening means that can be detachably fixed so as to sandwich the cored bar 2 with the base member 3. Adopting a bolt (hereinafter, referred to as a core metal fixing bolt) that is screwed into and out of the member 3 is preferable in order to simplify the work and the structure. Of course, the metal core fixture 4 is not limited to the above-described bolt, and a screw shaft (corresponding to the shaft portion) fixed to the base member 3 side and a nut (head) screwed to the screw shaft. Or a fastening means other than a screw mechanism, for example, a cam plate with an operating lever (corresponding to the head) at the tip of the shaft passing through the engaging groove. The cam plate may be provided so as to be rotatable, and the cam plate may be rotated by a lever operation to give a cam displacement that sandwiches the cored bar between the cam plate and the case.

In the case of the present embodiment , a cored bar fixing bolt is adopted as the cored bar fixing tool 4, and a partition that is built in the case 7 through a through hole 10 formed in the center of the bottom part (back yoke part) of the case 7. 8 is screwed into a screw hole 9 penetrating the crossed portion opened in the cross-shaped crossing portion, and the cored bar is fixed between the partition 8 and the case 7 by rotating the cored bar fixing bolt 4. It is provided so that 2 may be clamped and tightened. Needless to say, the case 7 may be provided so as to freely enter and exit the magnet board 3 by directly screwing the core metal fixing bolt 4 into the case 7 by making a screw hole in the case 7.

  The movable part of the cored bar fixing tool 4, that is, the cored bar fixing bolt or nut provided so as to be able to approach and separate from the base member is provided with a stopper 11 in order to prevent it from loosening too much and falling off the base member. It is preferred that The stopper 11 is not limited to a specific structure / means. For example, as shown in FIG. 2, an E-shaped retaining ring or a C-shaped retaining ring that is fitted by cutting an annular groove on the tip end side of the core metal fixing bolt 4. It is preferable to use various retaining rings such as a grip retaining ring, or a simple retaining means such as a spring pin that penetrates the shaft portion of the cored bar fixing bolt 4 or the fixing screw shaft in the radial direction (not shown).

  The magnet board 3 of the present embodiment includes, for example, four block-shaped magnets 6, a box-shaped case 7 that accommodates the magnets 6 in the internal space, and a cross that divides the internal space of the case 7 into four equal parts. It consists of a partition 8 in the shape. The case 7 and the partition 8 function also as a yoke and are not particularly limited as long as they are soft magnetic materials, and those conventionally used as yoke materials can be used. For example, iron , Silicon steel, permalloy, sendust and the like. The inner space of the case 7 is divided into four equal parts by a cross-shaped partition 8, and the magnets 6 adjacent to each section are arranged and accommodated so that the magnetic poles of adjacent magnets are different from each other. Further, the partition 8 may be fixed to the case 7 with a conductive adhesive, or may not be fixed in some cases, and may be fixed by tightening the core metal fixing bolt 4. good.

  In addition, a conductive anticorrosive member is provided in the gap between the case 7 and the magnet 6 with a conductive adhesive as necessary. In this case, the corrosion of the magnet 6 can be prevented by positively supplying a sufficient anticorrosion current. Further, an anti-corrosion film, a resin film, or a plating film may be formed on the surface of the magnet 6. The magnet 6 may be a samarium-based magnet, a cerium-based magnet, a ferrite magnet, or the like in addition to an Nd-Fe-B-based magnet (referred to as a neodymium magnet), and particularly a neodymium-based magnet having a large coercive force. Is preferred.

  The case 7 is formed so that the inner space is slightly deeper than the height (thickness) of the magnet 6 so that the peripheral edge of the opening slightly protrudes from the attracting surface of the magnet 6 accommodated inward. On the other hand, the thickness of the partition 8 is lower than the height of the magnet 6 so as not to protrude from the attracting surface of the magnet 6.

On the other hand, the core metal 2 in the case of the present embodiment comprises a plate member made of steel, galvanic inside the anode body 1 and extending longitudinally therethrough, galvanic anode body 1 of the protruded portion to the outside is a magnet Edition 3 An offset leg bent so as to be biased to the side is provided. An engagement groove 5 for hooking the core metal fixing bolt 4 protruding from the magnet board 3 is provided on the side of the offset leg that contacts the base member 3.

  The engaging groove 5 is an opening that penetrates in the thickness direction of the cored bar 2 and has one end opened at the periphery of the cored bar 2 to form an insertion port 5b through which the shaft part 4a of the cored bar fixture 4 can be introduced from the side. What is necessary is just to have at least the vertical engaging part 5a which is a hole and engages with the shaft part 4a of the cored bar fixing tool 4 in both the gravity action direction and the direction orthogonal to the gravity action direction. As shown in FIG. 3, the engagement groove 5 in the present embodiment has an L shape that passes through the horizontal engagement portion 5 c extending in the horizontal direction from the insertion port 5 b at the edge of the core metal 2 and reaches the vertical engagement portion 5 a. Is formed. In this case, the grooving process is simplified, and the detaching operation of the cored bar 2 can be performed simply by moving horizontally and vertically.

If the engagement groove 5 is an open hole having at least a vertical engagement portion 5a fixed in a state where the core metal fixing bolt 4 as a metal core fixing tool is engaged in the vertical direction, the shape thereof is L. The shape of the midway path 5d connecting the vertical engagement portion 5a and the peripheral insertion port 5b may be a slope as exemplified in FIG. 7E, or as exemplified in FIG. 7D. A combination of a horizontal plane and a slope, or a stepped shape as illustrated in FIG. 7C, or a vertical engagement portion 5a and a peripheral insertion port 5b as illustrated in FIG. 7B are directly connected. Various passage shapes such as the I shape may be used. Further, the engaging groove 5 as shown in FIG. 1, when arranging the galvanic anode body 1 in the vertical direction, the offset leg and galvanic under anode Body 1 located on the upper side of the galvanic anode body 1 The offset legs located on the side need not have the same shape and the same orientation, and the engagement grooves 5 having various shapes and orientations may be combined. For example, as shown in FIG. 7A, they may be formed at both ends of the cored bar 2 symmetrically about the vertical axis, respectively, or as shown in FIG. You may use combining the engagement groove | channel 5 of a different shape, such as combining the joint groove | channel 5 and the I-shaped engagement groove | channel 5. When such a complicated engagement groove 5 or a combination of different engagement grooves is employed, the operation of removing the metal core is more complicated than the simple L-shaped engagement groove 5. The core metal can be prevented from falling off from a simple movement caused by waves. On the other hand, when the engaging grooves 5 having the same structure are arranged in the same direction as shown in FIG. 1, the attaching / detaching operation is completed by moving the cored bar 2 while keeping it vertical, so that the operation is simplified. Become. Further, the vertical engagement portion 5a that is fixed in a state where the core metal fixing bolt 4 is engaged in the vertical direction is not necessarily present at the innermost portion of the open hole, and is present in the middle of the engagement groove 5. In addition, the insertion port 5b is not limited to the side of the cored bar 2 but may be on the end edge side.

  According to the current-carrying anode for cathodic protection constructed as described above, the magnet panel 3 fixed at both ends of the core metal 2 is brought close to the steel sheet pile, thereby being attracted and fixed at a desired position of the steel sheet pile. be able to. Since all the constituent members of the magnet panel 3 have conductivity, the galvanic anode body 1 and the steel sheet pile are electrically connected through the cored bar 2 from the case 7 that contacts the steel sheet pile. Thereby, corrosion of a steel sheet pile can be prevented.

  On the other hand, the exchange work of the galvanic anode body 1 is performed, for example, in the case of the core metal 2 having the L-shaped engagement groove 5, after loosening the core metal fixing bolt 4 to the extent that it cannot be removed from the case. The core metal 2 remaining on the top can be easily removed from the core metal fixing bolt 4 simply by lifting the metal core 2 upward in the vertical direction and then moving it horizontally in the horizontal engagement portion 5c.

After that, the new galvanic anode body 1 is submerged in the sea, the insertion port 5a of the engaging groove 5 of the core metal 2 is directed to the lower neck portion 4a of the core metal fixing bolt 4, and then flows parallel to the steel sheet pile. If the cored bar 2 is moved horizontally and pushed together with the main electrode body 1, the cored bar 2 and the current flow are transferred when the lower neck part / shaft part 4 a of the cored bar fixing bolt 4 reaches the innermost part of the horizontal engaging part 5 c. The anode body 1 descends to the deepest part of the vertical engagement part 5a by its own weight, and the metal core 2 is hooked on the metal core fixing bolt 4 at the deepest part of the vertical engagement part 5a. Therefore, the core metal 2 can be fixed to the magnet panel 3 by tightening the core metal fixing bolt 4. At this time, the core metal 2 and galvanic anode body 1, since it is pressed downward in the vertical direction by its own weight, for fixing the magnet plate 3 at the deepest portion of the vertical engagement portion 5a of the core metal 2 L-shaped grooves The movement of the metal core 2 with respect to the bolt 4 is restricted in the downward direction and in the horizontal direction. Therefore, even if the cored bar 2 is moved by waves, it cannot move and does not come off the magnet board 3. Further, even if tightening with the core metal fixing bolt 4 is loosened, the whole anode including the core metal 2 tends to move downward in the vertical direction by its own weight, so that the core metal 2 is engaged with the bolt 4. Will remain. Further, even if the lateral and longitudinal force is applied in such a wave force to the galvanic anode body 1 and the core metal 2, the engagement between the core metal fixing bolt 4 and the engaging groove 5 is released There is no.

As described above, the replacement operation has been mainly described by taking the L-shaped engagement groove 5 as an example. However, the replacement operation is not particularly limited to this. For example, as illustrated in FIGS. Even in the cored bar 2 that employs an open hole of a simple shape, it is possible to easily carry out the replacement work of the galvanic anode for cathodic protection. For example, when the engaging grooves 5 having the same shape are formed symmetrically like the cathodic anode for cathodic protection shown in FIG. 7A, the insertion holes 5b are connected to the core metal fixing bolts 4b. If the cored bar 2 is rotated counterclockwise (or clockwise) while being directed to the shaft part of the upper and lower shafts, the upper and lower cored metal fixing bolts 4 are vertically engaged with the upper and lower engaging grooves 5. Fits 5a at the same time. Further, as shown in FIG. 7B, in the case of a cathodic galvanic anode using an L-shaped engaging groove 5 and an I-shaped engaging groove 5 in combination, for fixing the upper cored bar. If the bolt 4 is directed to the insertion port 5b while the lower metal core fixing bolt 4 is applied to the lower end edge of the metal core 2 and the metal core 2 is moved horizontally, the upper and lower metal core fixing bolts 4 can be fitted into the vertical engaging portions 5a of the upper and lower engaging grooves 5 at the same time.

  FIG. 4 shows another embodiment. The galvanic anode fixing structure for cathodic protection of this embodiment includes a reinforcing plate 12 that connects all the magnet panels 3 together. This electro-corrosive galvanic anode is composed of a plurality of, for example, two, one set arranged in a row, and two sets of magnet boards 3 in total, one set at the top and bottom, connected to a reinforcing plate 12 by bolts 13, The cored bar 2 is detachably fixed. Since the reinforcing plate 12 can keep the interval between the magnet panels 3 constant, the interval between the core metal fixing bolts 4 for fixing the core metal 2 can be maintained when the magnet panel 3 is attracted to the steel sheet pile. . In addition, since the cored bar 2 having the crotch-shaped offset legs and the reinforcing plate 12 are connected and integrated, the strength as a structure is increased. Accordingly, the core metal 2 itself is less likely to be twisted due to the waves and the movement of the waves, so that it is possible to withstand larger waves. The core metal fixing bolt 4 is screwed into a screw hole formed in the reinforcing plate 12, but in some cases, a nut or the like may be welded to the reinforcing plate 12 to be used as a screw hole. .

Furthermore, another embodiment is shown in FIG. In this embodiment, a stabilizer 14 for preventing left and right shaking is further arranged in the embodiment of FIG. The stabilizer 14 includes a plate 15 made of an L-shaped channel arranged so as to be orthogonal to the reinforcing plate 12, and jack-up bolts 16 arranged at both ends thereof. The presence of the stabilizer 14, since the contact surface width to steel sheet pile of the reinforcing plate 12 and the magnet plate 3 expands, it is possible to suppress the rocking of the left and right galvanic anode body 1. When installing the magnetic panel 3 on the steel sheet pile, the jack-up bolt 16 protrudes toward the steel sheet pile side, and the adsorption force of the magnet 6 is reduced with the jack-up bolt 16 abutting against the steel sheet pile. Then, the jack-up bolts 16 can be retracted and then attracted and fixed in such a state that the yoke case 7 around the magnet 6 and the steel sheet pile are brought into contact with each other. After fixation, in order to suppress the swing of the left and right galvanic anode body 1 by adjusting the jack-up bolt 16, to function as a stabilizer. Having the stabilizer 14 can withstand larger waves. Of course, it is not necessary to use the stabilizer 14 and the reinforcing plate 12 of FIG. 4 together. For example, the plate 15 may be directly fixed to the offset leg portion of the core metal 2 by welding or the like.

Here, when attaching the current-carrying anode for cathodic protection to the steel sheet pile, the magnet panel 3 can be gently attached using a jack-up bolt or the like (not shown) as required, and the attachment work can be performed safely. Be able to do it. Specifically, before attaching the current-carrying anode for cathodic protection to the steel sheet pile, the jack-up bolt is made to protrude from the magnet panel 3, and when the magnet panel 3 is brought close to the steel sheet pile, Since the tip prevents contact between the case 7 of the magnet board 3 and the steel sheet pile, the magnet board 3 is attracted to the steel sheet pile by a weak force or not at all. Thereafter, by rotating the jack-up bolt around the axis and retracting it from the case 7 of the magnet panel 3, the magnet panel 3 and the steel sheet pile can be gradually approached and attracted.

The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, the magnet 6 is not particularly limited to its shape or size as long as it can exert an attractive force capable of firmly fixing the anode to the steel sheet pile, and is limited to a magnet material using a specific rare metal. It is not what is done. Further, in the present embodiment, an adjustment bolt is used to gradually bring the magnet panel 3 close to and attract the steel sheet pile to be attracted. However, the present invention is not particularly limited to this, and other intervals are used. The adjusting means may be used, or after the setting, only the core metal 2 is removed and the galvanic anode body 1 is replaced, so that the interval adjusting means itself is not necessarily provided. Also, the core metal fixing bolt 4 of the magnet panel 3 is fixed to the case 7 by welding or the like in the form of a cylinder with a threaded hole, jacking up bolts are provided in the inner screw hole, and the core metal is provided in the outer screw part. By screwing the nut for fixing the screw, the jack up bolt is brought into contact with the steel sheet pile before the magnet panel, and then the case is gradually pulled in against the steel sheet pile. You may make it prevent that it adsorb | sucks to a steel sheet pile shockingly by approaching.

DESCRIPTION OF SYMBOLS 1 Current-flow anode main body 2 Core metal 3 Magnet board as base member 4 Core metal fixing bolt as core metal fixture 4a Shaft portion 4b Head portion 5 Engaging groove 5a Vertical engagement portion 5b Insertion port 5c Horizontal engagement portion 6 Magnet 9 Screw hole 11 E-ring as retainer 12 Reinforcement plate 14 Stabilizer

Claims (3)

Bolts fixed to metal structures installed in water such as the ocean and rivers ,
A nut screwed against this ,
A galvanic anode body;
A cored bar penetrating the galvanic anode body and projecting both ends out of the galvanic anode body;
An engagement groove provided at both ends of the cored bar protruding from the galvanic electrode body,
The engagement groove is open to form a penetrating in the thickness direction and the insertion opening can be introduced at one end of the opening to the bolt from the side in the periphery in the direction perpendicular to the gravitational direction of the core metal of the metal core a hole, and at least provided with a vertical engaging part for engagement with the bolt in both directions perpendicular to the gravitational direction as well as the gravity acting direction,
The bolt is relatively inserted into the engagement groove from the insertion port of the engagement groove, and the nut is tightened in a state where the bolt is hooked in the gravity action direction at the innermost part of the vertical engagement portion. The galvanic anode fixing structure for anticorrosion is characterized in that the metal core is fixed to the metal structure . 2. The galvanic anode fixing structure for cathodic protection according to claim 1, wherein the engaging grooves are formed in the same direction at both ends of the metal core. The said engagement groove | channel comprises the L shape by which the said vertical engagement part is arrange | positioned above with respect to the horizontal engagement part of the direction orthogonal to the gravity action direction connected with the said insertion port. 2. A galvanic anode fixing structure for cathodic protection.

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