JP5481164B2 - Anti-corrosion cap - Google Patents

Description

  The present invention relates to a fastening member that fastens an anchor and various members, and an anticorrosion cap that prevents corrosion of the fastening member and the like.

  For example, a steel anchor is fixed to a concrete wall so that the screw part is exposed on the surface from the wall, and a hanging bracket is fixed to the exposed part and exposed from the surface. The part is easily corroded.

  In general, metal corrosion is called electro-corrosion. The anode reaction (oxidation reaction) in which atoms in the metal material dissolve as cations in the electrolyte main liquid (water) through the surrounding humidity (water), and the oxidizing agent is an electron. In order to prevent this battery reaction, zinc that generates cations is used as an anticorrosive or sacrificial material because it is a local battery reaction that occurs simultaneously with the cathode reaction (reduction reaction) that receives the hydrogen. Has been previously proposed (see Patent Document 1).

  According to the previous proposal, a cap formed by surrounding a zinc rod with an insulating material is brought into conductive contact with one end portion of the zinc rod with respect to a bolt head.

  However, according to the previous proposal, in order to eliminate the potential difference generated on the surface of the bolt, electrons supplied from the zinc rod return to the zinc rod (corrosion protection current flows from the zinc rod to the bolt side). Therefore, there is a large number of disordered atomic arrangements on the surface of the bolt that is not in contact with the zinc rod, and a local battery is formed by forming a high potential cathode around it. Therefore, there is a problem that the anticorrosion effect cannot be obtained, and there is a problem that the structure is complicated and the manufacturing cost is high, such as surrounding the zinc rod with an insulating material.

  The present invention has been proposed in view of the above problems, and an object of the present invention is to provide an anticorrosion cap having a simple structure and a high anticorrosion effect.

In order to achieve the above object, the anti-corrosion cap according to the present invention includes a metal stud portion exposed from concrete and having a male screw portion and a metal nut screwed to the portion to prevent corrosion. a food cap is integrally formed with zinc so as to cover the front Kikin genus studs portion and said nut, and a portion covering the nut, a female screw to be fitted to the metallic stud portion protruding from the nut are engraved on the inner peripheral surface, comprises a hexagonal portion to be operated when screwing the sacrificial cap to the metal stud portion, and a portion covering the head of the metal stud portion, and for the anti-corrosion it is characterized in that the inner surface of the cap is configured to abut in electrical communication before Kikin genus studs portion and said nut.

Also, corrosion cap according to the present invention, in a state in which through holes are mounted in a predetermined fitting before Kikin genus studs portion, the head of the front Kikin genus studs portion between said predetermined metal It is formed so as to cover the entire portion and to contact the predetermined metal fitting.
Also, sacrificial cap of the present invention, the nut is one having a washer, the nut is pre-Kikin genus studs portion after the through holes are mounted in the predetermined fitting before Kikin genus studs portion the at Nishishime state, covers the nut and the washer together cover the entire head before Kikin genus studs portion between said predetermined metal and so as to contact the predetermined fitting Is formed.

Anticorrosion cap according to the present invention, the metal stud portion, a anchor having a male threaded portion on the exposed portion of its, the hex portion has the female screw to be fitted to the male threaded portion of the anchor It is engraved on the inner peripheral surface, and the exposed portion of the metal stud is a hexagonal bolt head or a hexagonal bolt head, and is attached to the head portion via a fixing means having conductivity. The fixing means is composed of a magnet or a conductive adhesive.

The anti- corrosion cap according to the present invention is an anti- corrosion cap integrally formed of zinc so as to cover a metal stud portion exposed from concrete and having a male screw portion and a metal nut screwed to the portion. and because the inner surface are to abut in electrical communication before Kikin genus studs portion and said nut, as anticorrosion cap according to proposed earlier, the insulation around the sacrificial zinc material There is an advantage that a structure such as enclosing is unnecessary, and the structure is simple and can be implemented at low cost.

In addition, since the anti-corrosion cap is formed of zinc, the anti-corrosion effect can be greatly improved compared to the anti-corrosion cap according to the previous proposal because it contacts the metal part in a wide area. There is also.
Further, anticorrosion cap, hanging in a state in which a predetermined fitting is attached to the front Kikin genus studs portion of fittings or the like for lifting, cover the head of the pre-Kikin genus studs portion, and the predetermined fitting It is formed so as to abut the well before Kikin genus studs portion, galvanic corrosion of certain metal abutting also prevented.
Further, anticorrosion cap before when the nut with washer Kikin genus studs moiety is attached, covering the nut and the washer together cover the entire head before Kikin genus studs portion, because it is formed and so as to contact the predetermined fitting, further in front Symbol washer is prevented from cathodic protection.

The part exposed in the air of the metal stud part is an anchor having a male screw part, and the female screw fitted to the male screw part is engraved on the inner peripheral surface of the hexagonal part of the anticorrosion cap Then, when this female thread portion is screwed onto the male thread portion, in addition to the above effects, there is an advantage that the anticorrosion cap can be a lock nut for preventing loosening.

  And, if the anti-corrosion cap is attached to the head portion of the bolt or the like via a fixing means such as a conductive adhesive having conductivity, the anti-corrosion cap for the existing fixing bolt as well as the anchor having the male screw portion is used. Can be easily used, and has an advantage that it can be used widely.

  In addition, when attaching the anti-corrosion cap to the head of a bolt or the like, if the fixing means is composed of a magnet, it can be attached simply by adsorbing the magnet to an anchor or fixing bolt made of a magnetized material. In addition, there is an advantage that replacement can be easily performed.

These are the perspective views of the state which decomposed | disassembled the anti-corrosion cap concerning this invention, and the anchor which mounts this. These are the longitudinal cross-sectional side views of the state which attached the anti-corrosion cap concerning this invention to the anchor. These are sectional drawings which show another embodiment of the anti-corrosion cap concerning this invention. These are the exploded views of the anti-corrosion cap in another embodiment concerning this invention. These are sectional drawings which show another embodiment of the anti-corrosion cap concerning this invention.

Hereinafter, the most preferable embodiment according to the anti-corrosion cap of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of an anchor 1 and an anti-corrosion cap 2 attached thereto, and FIG. 2 is a longitudinal side view of the anchor 1 with an anti-corrosion cap attached thereto. A so-called post-installed anchor 1 is attached to a portion drilled from the surface of concrete in order to attach a metal fitting for suspension to a desired portion.

  The post-installed anchor 1 includes an expansion sleeve 3 formed of a metal such as iron, and an expansion driving pin 4 that is driven inward of the expansion sleeve 3. A male screw portion (metal stud portion) 5 is formed on the front side portion of the cylindrical portion, and four slits 6 for expansion are formed on the rear side portion of the cylindrical portion.

  The thickness of the cylindrical portion in which the slit 6 is formed is thick on the end side as shown in FIG. 2, and the male screw is inserted into the mounting hole 8 drilled in the concrete 7 as shown in FIG. When the expansion sleeve 3 is inserted in a state where the portion 5 is exposed, and the expansion driving pin 4 is driven, the cylindrical portion of the four slits 6 for expansion is opened outward and fixed. This is a post-installed anchor (hereinafter simply referred to as an anchor) 1.

  As described above, the male screw portion 5 embedded in the mounting hole 8 drilled in the concrete 7 and protruding from the surface of the concrete 7 has a through-hole in the hook-shaped suspension member 9 as shown in FIG. After mounting 11, an iron nut 10 made of the same material as the anchor 1 is screwed, and the anticorrosion cap 2 is fitted to the male screw portion 5 protruding from the nut 10.

  The anti-corrosion cap 2 is pure zinc (commonly known as electro zinc / Zn ADC 2) obtained by electrolysis, and covers the nut 10 and its washer portion 12, and a hexagon for operating the anti-corrosion cap 2. The portion 13 and a portion covering the portion of the male screw portion 5 protruding from the nut 10 are integrally formed.

An internal thread portion 14 is formed on the inner peripheral surface of the hexagonal portion 13.
Here, a description will be given of pure zinc (commonly referred to as electro-zinc) obtained by the electrolytic method for forming the anti-corrosion cap 2. Pure zinc obtained by this electrolytic method generally has a higher hardness than lead and is the purest zinc ingot. The purity of zinc such as special zinc bullion and ordinary zinc bullion is 99.97% or more by weight.

  Depending on the application, when the anti-corrosion cap 2 has a hardness, the hardness increases when aluminum is mixed with the pure zinc, but the flexibility tends to be lost and the anti-corrosion cap of the present invention tends to become brittle. As for zinc used for No. 2, it is desirable that the aluminum content is 4.3% or less by weight, as in the case of two types of zinc alloy die casting (commonly called type 2 zinc).

The anticorrosion cap 2 formed as described above is engaged with the male screw 5 protruding from the nut 10 by operating the hexagonal portion 13, and the female screw portion 14 of the anticorrosion cap 2 is screwed. When mounted on the anchor 1, electrons supplied from the anticorrosion cap 2 due to the electromotive force of zinc are transferred from the nut 10 and the male screw portion 5 with which the nut 10 is screwed to the anticorrosion cap 2 via the female screw portion 14. Returning, current flows from the anti-corrosion cap 2 to the anchor 1 on the male screw portion 5 side.
As a result, the corrosion of the anchor 1 portion and the suspension member 9 which are covered with the anti-corrosion cap 2 and in contact with each other is prevented.

  Incidentally, when the anchor member 1 of the anti-corrosion cap 2 according to the present invention is applied to the anchor 1 fixed with the nut 10, the suspension member 9 in the several millimeters around the anti-corrosion cap 2 is also prevented from forming a local battery. It was possible to confirm the effect of preventing corrosion.

  In the above embodiment, in order to fit the male screw portion 5 protruding in the air, the female screw portion 14 is engraved on the inner peripheral surface of the anticorrosion cap 2, but the anticorrosion cap 2 is illustrated in FIG. 3 is formed in a circular cup shape, and a conductive adhesive 15 is provided on the inner surface, and this is fitted to and bonded to a head 17 of a bolt (metal stud portion) 16 so that an existing bolt It is possible to make the cap 2 for preventing corrosion of the head.

  As this conductive adhesive 15, gold powder, silver powder, copper powder, nickel powder, aluminum powder, plating powder, carbon powder, graphite powder and the like as a conductive filler are kneaded in high concentration in an epoxy resin as a binder, Although the resistance value of the cured product varies depending on the blending content of the conductive filler, the general volume resistivity is 100 to 10 <-5> [Omega] .cm. A low resistance having a power of 10 to 5-5 Ω · cm is desirable.

  As shown in FIG. 4, if the magnet 18 is fixed to the inner side of the anti-corrosion cap 2 formed in the cup shape with the conductive adhesive 15, according to the standard of the bolt 16 in advance. In the field, as shown in FIG. 5, the magnet 18 can be used by a simple operation by magnetically attaching it to the head 17 of the bolt 16.

  As described above, since the corrosion resistance can be achieved by attaching the anti-corrosion cap 2 of the present invention, it is possible to greatly improve the durability of metal studs on bridges and highways, which can contribute to safety.

DESCRIPTION OF SYMBOLS 1 ... Anchor 2 ... Anti-corrosion cap 3 ... Expansion sleeve 4 ... Expansion drive-in pin 5 ... Male screw part 6 ... Slit 7 ... Concrete 8 ... Installation Hole 9 ... Hanging member 10 ... Nut 11 ... Through hole 12 ... Washer part 13 ... Hexagon part 14 ... Female thread part 15 ... Conductive adhesive 16 ...・ Bolt 17 ... Bolt head 18 ... Magnet

Claims (4)

A corrosion prevention cap for preventing corrosion of a metal stud portion exposed from concrete and having a male screw portion and a metal nut screwed to the portion ,
Is integrally formed with zinc As before covering Kikin genus studs portion and said nut,
A portion covering the nut;
A female screw that fits into the metal stud portion protruding from the nut is engraved on the inner peripheral surface, and a hexagonal portion that is operated when screwing the anti-corrosion cap onto the metal stud portion;
A portion covering the head of the metal stud portion,
Anticorrosion cap, wherein the inner surface of the sacrificial cap is configured to abut in electrical communication before Kikin genus studs portion and said nut. In a state in which through holes are mounted in a predetermined fitting before Kikin genus studs portion covers the entire head before Kikin genus studs portion between said predetermined metal and the predetermined fitting The anti-corrosion cap according to claim 1, which is formed so as to abut. The nut is one having a washer, in a state in which the nut is Nishishime before Kikin genus studs portion after the through-holes of the predetermined fitting is attached to the front Kikin genus studs portion, said between a predetermined fitting before with to cover the entire Kikin genus studs portion of the head cover the nut and the washer, and according to claim 2 which is formed so as to contact the predetermined fitting Anti-corrosion cap. Before Kikin genus studs portion, a anchor having a male threaded portion in a portion thereof exposed, said hexagonal portion being engraved on the female threaded inner circumferential surface to be fitted to the male threaded portion of the anchor The anti-corrosion cap according to any one of claims 1 to 3, wherein the anti-corrosion cap is provided.

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