JP3014066B2 - How to install a galvanic anode for underwater metal structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of mounting a galvanic anode used for corrosion prevention of a metal structure constructed in a river or seawater such as a steel sheet pile quay, a floating steel structure, a water intake facility, and the like.

[0002]

2. Description of the Related Art As an anti-corrosion method for a submerged portion of a metal structure such as a steel sheet pile quay wall, a floating steel structure, an intake facility, etc., an electrolytic protection method using a galvanic anode made of aluminum, zinc, magnesium, or an alloy thereof has been widely used. It is used.
For example, as shown in FIG. 3, these galvanic anodes 5 are cast into a block body holding a metal core 4 such as a flat steel or a round steel. The portions 4a and 4b protruding from are bent and formed in a straight line or a crank shape. When the protruding portions 4a, 4b of the cored bar are formed in a straight line, when the galvanic anode 5 is attached to, for example, the steel sheet pile quay 1, the galvanic anode 5 contacts the steel sheet pile quay 1 as shown in the drawing. In order to avoid contact, the grooves 4a and 4b were previously cut into appropriate lengths at both ends of the protruding portions 4a and 4b, and grooved steel bars 6a and 6b were welded to the bottom rear surfaces to secure the separation legs. Thereafter, it is common to weld the grooved steel bars 6a, 6b by bringing the groove opening edges into contact with the steel sheet piles 1a, 1b. When the protruding portions 4a and 4b of the cored bar are bent into a crank shape to form separation legs, the ends of the protruded portions 4a and 4b of the cored bar are directly connected to the steel sheet pile 1.
a, 1b, or when the separating legs are insufficient, the protruding portions 4a, 4b of the core metal are preliminarily formed in the same manner as when the protruding portions 4a, 4b are formed in a straight line.
Channel steel 6a, 6b cut to the appropriate length at the end of 4b
Is generally welded to the steel sheet piles 1a and 1b, and the figure shows this case. When welding the grooved steels 6a, 6b or the protruding portions 4a, 4b of the core bar to the steel sheet piles 1a, 1b, for example, (1) the steel sheet pile quay above the position where the galvanic anode 5 is to be mounted A hook or the like is welded to 1 and an end of the wire wound around the galvanic anode 5 is supported by being hooked on the hook or the like. (2) In the water, another diver holds the galvanic anode 5. By such means, the galvanic anode 5 must be held at a predetermined position on the steel sheet pile quay 1.

[0003]

According to the conventional method (1), the hooks must be welded to the steel sheet pile quay 1 at least as many as the galvanic anodes 5 to be mounted, and the hooks must be welded. The welding work is performed by divers in difficult-to-work water, and this has caused a great increase in costs, such as an increase in personnel and a delay in the construction period. Further, according to the conventional method (2), while the grooved steel 6a, 6b or the protruding portion 4a, 4b of the core bar is welded to the steel sheet piles 1a, 1b, it is different from the diver who performs the welding. The diver needs to support the galvanic anode 5, which increases the number of personnel and causes the galvanic anode 5 to fall off during welding work. Furthermore, since the surface of the steel sheet pile quay 1 has a structure in which irregularities are regularly repeated at regular intervals, when the galvanic anode 5 is mounted horizontally on the steel sheet pile quay 1, the grooved steel 6a, 6b
Alternatively, the protruding portions 4a, 4b of the metal core must be welded to the steel sheet piles 1a, 1b constituting the convex portions. However, since the repetition interval of the concave and convex portions differs depending on the type of the steel sheet piles 1a, 1b, the steel sheet piles 1a , 1b, the length and the like of the protruding portions 4a, 4b of the core metal must be designed and manufactured, which causes an increase in cost. The protruding portions 4a, 4b of the cored bar are usually steel sheet piles 1a, 1b.
It is designed and manufactured based on the drawings showing the structure of
If the actual structure of the steel sheet piles 1a, 1b is different from that shown in the drawing due to some cause, the protruding portions 4a, 4b of the core bar need to be cut or added, which is troublesome. In addition, steel sheet piles 1a and 1b whose surfaces are coated with coating,
a, 6b or the protruding portions 4a, 4b of the core bar are welded by the steel sheet piles 1a, 1b at the positions to be welded.
Although it is necessary to remove the surface coating and lining, etc., there is a drawback that repair of the coating, lining and the like is practically impossible since the welded portion is under water. An object of the present invention is to provide a method for mounting a galvanic anode that does not involve a troublesome supporting operation such as hook mounting and support when mounting on a corrosion-protected body, and does not involve a risk of falling off. .

[0004]

In order to achieve the above object, in the mounting method of the present invention, a notch having a size and a shape capable of accommodating a core bar protruding from both ends of a galvanic anode is provided. At least two fixing brackets were attached to the metal structure at intervals such that the protruding portion of the core of the galvanic anode could be placed thereon, and the core of the galvanic anode was mounted on the notch of the fixture. Thereafter, the protruding portion of the core metal of the galvanic anode and the fixing bracket are welded.

[0005]

[Function] If the protruding part of the core metal protruding from both ends of the galvanic anode in a double arm shape is engaged with the notch of the fixing bracket attached to the approximate position of the metal structure, the galvanic anode becomes Since it is supported by absorbing design errors, it can be adjusted to an appropriate position and then welded under conditions where there is no risk of falling off.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment will be described with reference to the drawings. In FIG. 1, reference numerals 1a and 1b denote steel sheet piles, reference numerals 3a and 3b denote fixing brackets, and they are to be mounted on the upper portions of the rising portions 31a and 31b. Notch portions 32a, 32b having a size and shape capable of accommodating portions 4a, 4b protruding from both ends of galvanic anode 5, and rising portions 31a, 31
Bottom plates 33a and 33b orthogonal to b are provided. This fixing bracket may be one obtained by cutting a grooved steel into an appropriate length and having a notch at the top, or one obtained by cutting an H-shaped steel into an appropriate length and having a notch at the top. Also, the shape of the cutout portion may be various shapes such as a rectangle, a square, a triangle, and a semicircle in which the edge of the fixing bracket is the base. The method of attaching the galvanic anode 5 to the existing steel sheet pile quay 1 according to the present invention is as follows. First, the steel sheet piles 1a, 1b forming the convex surface of the steel sheet pile quay 1
After removing rust, paint, dirt, and the like adhering near the position where the fixing brackets 3a, 3b are to be welded on the surface, the cutouts of the cutouts 32a, 32b face upward, and the bottom plate 3
3a and 33b are pressed against steel sheet piles 1a and 1b and welded. At this time, the fixing brackets 3a and 3b are arranged at such an interval that the protruding portions 4a and 4b of the core metal of the galvanic anode 5 can be placed.
And it welds to almost the same height. Next, the fixing bracket 3a,
After the arbitrary positions of the protruding portions 4a and 4b of the core of the galvano-electric anode 5 are put on the notches 32a and 32b of 3b, the notches 32a and 32b and the protruding portions 4a and
4b is welded. When the galvanic anode 5 is attached to the newly installed steel sheet pile quay 1 whose surface is coated with coating, lining, etc., the coating, lining, etc. are applied to the steel sheet pile 1a,
Before application to 1b, the fixing brackets 3a, 3b are welded, and after the steel sheet pile quay 1 is constructed in water, the notches 32a, 32
After the arbitrary positions of the protruding parts 4a and 4b of the core of the galvanic anode 5 are put on b, the notches 32a and 32b and the protruding parts 4a and 4b of the core are welded. The protruding portions 4a and 4b of the core metal of the galvanic anode 5 according to the present invention may be formed in a straight line or may be formed by bending in a crank shape. In addition, the galvanic anode mounting method according to the present invention is not only a steel sheet pile quay, but also a floating steel structure, a water intake facility, etc.
In addition to being widely used, it can also be used when a galvanic anode is attached to the bottom surface 2 of the metal structure 7 as shown in FIG.

[0007]

Since the present invention is configured as described above, it has the following effects. (1) If the fixing metal is welded to the metal structure at such an interval as to support the metal core protruding from both ends of the galvanic anode, a notch provided at an arbitrary position of the metal core and a rising part of the metal fixing. To weld the galvanic anode to the metal structure, so there is no need to design and manufacture the length of the core of the galvanic anode according to the shape of the metal structure. In this case, there is no need to process the metal core, so that the cost of the galvanic anode production cost and the galvanic anode mounting cost can be greatly reduced. (2) a suspending tool for holding the galvano anode when welding a notch provided at the rising portion of the metal fitting welded to the metal structure and a core bar protruding from both ends of the galvano anode; This eliminates the need for a diver, greatly reducing the cost of the galvanic anode mounting work, and there is no danger of the galvanic anode dropping during welding. (3) Fixing brackets can be welded to new metal structures whose surfaces are coated with paint or lining before applying coating such as paint or lining. Even after installing the galvanic anode after
It is not necessary to peel off the coating such as painting or lining of the metal structure, and if the notch of the fixture is provided away from the metal structure, the notch and the core of the galvanic anode are welded. The coating does not degrade the coating such as coating and lining of the metal structure due to the heat influence. (4) The method for mounting a galvanic anode according to the present invention is not limited to the case where the galvanic anode is mounted in water, but also for a metal structure constructed in water after being manufactured on land, such as a submerged box, for example. The same effect can be obtained when the galvanic anode is attached.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a steel sheet pile quay wall current-carrying anode according to an embodiment of the present invention.

FIG. 2 is a perspective view of a metal structure according to an embodiment of the present invention after a bottom current carrying anode is attached.

FIG. 3 is a perspective view showing a steel sheet pile quay wall current-carrying anode, showing an embodiment of a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel sheet pile quay wall 1a, 1b Steel sheet pile 2 Bottom surface of metal structure 3a, 3b Fixing metal parts 31a, 31b Rising parts 32a, 32b Notch parts 33a, 33b Bottom plate 4 Core metal 4a, 4b Projected part of core metal 5 Anode 6a, 6b Channel steel 7 Metal structure

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C23F 13/00

Claims (1)

(57) [Claims] 1. At least two fixing brackets each having a cutout having a size and a shape capable of accommodating a metal core protruding from both ends of a galvanic anode. Attach it to a metal structure at intervals that can be put on,
An underwater metal structure, wherein the protruding portion of the core of the galvanic anode is placed on a cutout of the fixing bracket, and then the protruding portion of the core of the galvanic anode and the fixing bracket are welded. How to install a galvanic anode for electrical protection of objects.