JP2000034586A - Rust prevention method for cut edge of galvanized steel sheet - Google Patents

Abstract

(57) [Summary] [Purpose] When using an extremely thick galvanized steel sheet, red rust may occur on the cut end face. The purpose is to suppress this occurrence. [Structure] A cut end face of a molded product made of a thick extra-thick galvanized steel sheet is covered with a covering member made of a thin galvanized steel sheet, aluminum, an aluminum alloy, alumite, a synthetic resin, or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing rust on a cut end face of a molded product made of a thick galvanized steel sheet.

[0002]

2. Description of the Related Art Conventionally, a molded product body made of a thick steel plate has been rust-proofed by a method called so-called "dipling plating". That is, after forming into a required shape, it is a method of immersing in a molten zinc bath and plating. Such a plating method is expensive due to soaring costs such as a disposal cost of a plating waste solution, a transportation cost to and from a plating factory, and labor costs that are difficult to save labor. In the case of heavy, heavy products made of thick steel plates, laborious operations such as immersion in a large plating tank or pickling tank using a crane are required. However, there are also restrictions, so the problem is deepening.

Conventionally, it is continuously produced in a roll state.
As a hot-dip galvanized steel sheet having a base material of a hot coil having a thickness of 1.2 to 6 mm, a limit of 600 g per square meter on both sides of zinc has been limited. However, recently, Nippon Steel Corporation has succeeded in mass-producing, so-called extra-thick galvanized steel sheet, has succeeded in industrially depositing up to 1,100 grams of zinc per square meter on both sides. Further, products having further enhanced rust prevention by adding other metals such as aluminum and magnesium have been developed. This type of plated steel is
Since it is a roll-shaped base material having a fixed width and cutting is required to obtain a molded product having a desired size and shape, generation of a cut end face is inevitable.

[0004] In the case of galvanized steel sheet, the effect of sacrificial rust prevention of zinc works, and zinc near the cut end surface begins to melt,
It is already known to suppress the progress of rust on the cut end surface. The same applies to hot-dip galvanized steel sheets, but in the case of thick steel sheets with a thickness of 4 mm or more, it has been found that red rust may be generated on the cut end surface under long-term exposure. did. Since this red rust does not proceed inside, it has been confirmed in various experiments that it has the same rust-preventing effect as "dip pickling plating", but the red rust tends to have an external anxiety.

[0005]

SUMMARY OF THE INVENTION The present invention prevents the occurrence of red rust on the cut end surface when using an extremely thick hot-dip galvanized steel sheet, and is equivalent to or more effective than "dip pickling plating". It exhibits a rust effect and can be used as a material for permanent structures.

[0006]

According to the present invention, in order to solve such a problem, a cut end face of a molded product formed of a thick extra-thick galvanized steel sheet is coated with a galvanized steel sheet, aluminum, or aluminum. The problem is solved by closely covering a coating material made of an alloy, aluminum whose surface is oxidized, or a synthetic resin.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Thin galvanized steel sheets have a narrow cut surface, so that rust hardly occurs. Aluminum is easy to oxidize, but because oxidized aluminum is dense and has few voids, the supply of oxygen is cut off at the surface,
Rust does not progress. An alloy mainly composed of aluminum, aluminum whose surface is oxidized, which is generally called "alumite", does not easily rust and does not easily pass oxygen.

[0008] In the case of synthetic resin, it does not rust itself, generally has the property of being impervious to oxygen, and, like aluminum, can be easily extruded using a die having a predetermined shape. It is easy to form a mold having a sectional shape.
The present invention uses a coating material made of such a material,
The purpose is to cover the cut end face of a thick galvanized steel sheet and to suppress rust on the end face of the unplated steel sheet.

[0009]

Embodiment 1 FIG. 1 shows an angle-shaped coated base material 1 that is widely used in construction and civil engineering work even in outdoor exposure conditions. It is formed of an extremely thick hot-dip galvanized steel sheet with a thickness of 4.5 mm, and has a shape in which two 5 cm-wide strips intersect at right angles. Although it is a hot-dip galvanized steel sheet, the cut surface 11 has no plating layer. The cut end face is covered with a coating material 2 made of an extruded aluminum product having a thickness of 1 mm and having a U-shaped cross section to cover the exposed cut surface 11 of the steel plate.

[0010] As shown in FIG. 2, the coating material 2 may be fitted over the entire angle material 3. Since aluminum can be easily extruded and drawn, it is not specified, but the coating 2 is suitably formed by such molding.

[0011]

Embodiment 2 FIG. 3 shows a planting container 5 which is also used as a legal frame.
It is. The plane shape of the entire frame is a cross shape, and in the center, a support plate 4 for fixing an end portion in the ground and supporting an anchor for applying tension to the frame to stabilize the ground.
Is provided. An anchor hole 41 is provided at the center of the support plate. Four arms 51 projecting from the support plate in all directions are
It has a semi-cylindrical shape that opens upward and is 2 meters in length. The side shape of the arm section is the same from the center to the tip, and the outer dimensions are 30 cm in length and width.
Each arm 51 is divided at its tip and two places by a partition plate 52 made of a water-permeable plate.
Is filled.

As shown in FIG. 4, the cross-sectional configuration of the arm portion 51 of the planting container is such that two flat plates 12 made of extremely thick hot-dip galvanized steel sheet having a basis weight of 1 kg / square meter on both sides and a thickness of 4 mm are provided. A three-layer laminated plate 13 formed by sandwiching a single 12-mm-thick unplated flat plate 12 in a sandwich shape is used.

[0013] Both ends in the longitudinal direction and the cut end faces 11 appearing on both side edges are covered with a covering material 2 made of an extruded aluminum product made of anodized material and protected. As shown in FIG. 5, the covering member 2 has a flat shape as a whole, but is provided with a number of deep V-shaped grooves 21 parallel to each other in the extrusion direction to facilitate bending and bending in the width direction. Use Even if the thickness of the cut end surface changes, it is convenient because it can cope with it. In the case of coating, it is preferable to adhere to the cut end face using an epoxy-based adhesive having good weather resistance.

[0014]

Third Embodiment FIG. 6 shows another example of a planting container 5 which is also used as a legal frame as in the previous embodiment. It is larger than the previous embodiment, and has an overall shape having three arms 51. The cross-sectional structure of the side wall of the arm 51 has a thickness of 6 mm as shown in FIG.
Between two flat plates 12 of galvanized steel sheet with an extremely thick basis weight of 1 kg / zm
A composite plate 15 made of the same material and having a total thickness of 15 cm is used by sandwiching a corrugated plate 14 having a cross section having repeated irregularities.

In the case of compounding, both side edges of the innermost plated steel sheet are bent outward twice as shown in FIG.
2 is formed so as to cover the cut end face of the composite board 15 by itself. The processing of the end face in the longitudinal direction is performed as shown in FIG.
It is preferable to cover with a covering member made of a rectangular shallow box-shaped covering container 20 made of a synthetic resin injection molded product. The airtightness between the main body and the covering member is preferably as tight as possible. Therefore, it is preferable that both are securely connected using a resin adhesive.

[0016]

Fourth Embodiment FIG. 9 shows an anchor material 6 having a length of 10 meters, which is made of a hot-dip galvanized steel sheet having a thickness of 4.5 mm and a width of 10 cm.
This is an example in which a large number of dished concave portions 61 having a dish-shaped cross section are provided on the surface by continuous press working. Driving recess 6
1 is a circular shape having a diameter of 2 centimeters, a height of 5 millimeters, and a staggered pattern of approximately 5 centimeters.

As shown in FIG. 10, both edges are covered with anodized aluminum coating edges 22.
Secure with screws and adhesive. The coating edge 22 is 1 mm thick and has a U-shaped cross section with almost no gap.

When such an anchor material 6 is used, as shown in FIG. 11, the anchor material 6 is laid on the embankment base 70 at a predetermined interval in a direction orthogonal to the embankment planning line. In that case, the driving recess 61 is installed so as to cut into the embankment base. A surface material 71 having an L-shaped or inverted T-shaped side surface is erected at the tip of the embankment surface side, and the anchor material 6 is connected to the bottom plate 72 of the surface material 71 at intervals of 50 cm in the horizontal direction.

The embankment 7 is laid on the anchor material thus laid. The first layer embankment 7 which is sufficiently compacted using a road roller, a tamper or the like is formed. The height is the same as the surface material 71. By repeating such operations, a reinforcing embankment in which the anchor members 6 are laid in layers is completed. The anchor material 6 formed of an extremely thick galvanized steel sheet is sufficiently galvanized and does not easily rust in the soil, but there is no concern about rust because the cut end face is covered with an edge material made of aluminum. The tensile strength of the steel sheet is high, and in particular, the strength of the price unit is outstandingly competitive, so that the price / effect performance is excellent.

According to the present invention, the cut end face, which is a weak point of a hot-dip galvanized steel sheet, is covered with a coating member made of a material which is not easily rusted, such as a hot-dip galvanized steel sheet, aluminum, alumite, or a synthetic resin. Concerns can be dispelled. Conventionally, various large-sized and heavy-weight members that required “dip pickling plating” can be replaced with extra-thick galvanized steel sheets that can be mass-produced in factories. Although only some examples are described, the galvanized steel sheet coated with the cut end face based on the present invention can be greatly rationalized, and is mainly used for construction, civil engineering, machinery, etc. Applicable to the application.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of an angle member.

FIG. 2 is a cross-sectional view showing another example of the angle member.

FIG. 3 is a plan view showing an example of a planting container that also serves as a legal frame.

FIG. 4 is a side sectional view of an example of a planting container.

FIG. 5 is a cross-sectional view showing an example of an aluminum covering material.

FIG. 6 is a plan view showing another example of the planting container.

FIG. 7 is a side sectional view (part) showing a structure of a side wall of an arm.

FIG. 8 is a perspective view of a covering member formed of a box-shaped container.

FIG. 9 is a perspective view showing an example of an anchor member.

FIG. 10 is a front sectional view showing the structure of the anchor member.

FIG. 11 is a side sectional view showing an example of a formation state of an embankment reinforced with an anchor material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coating base material 11 Cutting surface 2 Coating material 20 Coating container 21 V-shaped groove 22 Coating edge 3 Angle material 4 Support plate 41 Anchor hole 5 Planting container 51 Arm part 52 Partition plate 53 Planting soil 6 Anchor material 61 Depression 7 Embankment 71 Surface material

Claims (4)

[Claims] 1. A cut end face of a molded product made of a thick galvanized steel sheet is covered with a coating material made of a galvanized steel sheet, aluminum, an aluminum alloy, aluminum having an oxidized surface, a synthetic resin, or the like. Rust prevention method of cut end face of galvanized steel sheet. 2. The method for preventing rust on a cut end face of a galvanized steel sheet according to claim 1, wherein the coating material according to claim 1 is provided in close contact with the cut end face of the coated molded article main body. . 3. The method according to claim 1, wherein the coating material is an extruded product or a drawn product. Rust method. 4. The coating material has a cross-sectional shape of a thin flat plate as a whole, and is provided with one or a plurality of thin grooves in at least one direction. The method for preventing rust on a cut end surface of a galvanized steel sheet according to any one of claims 1 to 3, wherein the method is capable of bending.