JPH042285Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention relates to a covered steel protective fence used for parks, sidewalks, and various other buildings. In addition to having an uneven surface with a deep texture and a high design quality, it also has high corrosion resistance, excellent adhesion of the coating layer, and is resistant to impacts, etc., and is excellent in outdoor environments. This article relates to a coated steel protective fence that can be expected to be durable. In addition, in this specification,
The term "protective fence" refers to all types of fences used for protection purposes, such as guard fences, guardrails, handrails, various types of handrails, fences for plants, and fences for gardening.

[Conventional technology]

There are various types of such protective fences, but in terms of material, they can be broadly classified into steel and concrete.

Steel items are usually coated with various anti-rust coatings.
For actual use.

When it is made of concrete, it is often used by adding an uneven pattern to the surface to make it look like pseudo-wood (pseudo-wood), and then coloring it appropriately.

[Problem that the invention attempts to solve]

However, steel products that are simply painted on the surface look monotonous and lack expression, giving off a cold, metallic impression. Apart from places like expressways where only the overall shape of the design is considered, such things can also be used on sidewalks, parks, residential courts, etc.
It is essentially unsuitable for places such as balconies, where you can feel the texture of the fabric from close quarters.
The cold metallic feel can be alleviated to some extent by applying sand mixed paint, but even in this case, the appearance itself remains monotonous and cold, and no rust prevention effect can be expected.
As described above, conventional steel products are significantly lacking in design elements when viewed from a close distance, making them difficult to use in some practical locations.

On the other hand, those made of concrete are advantageous in terms of design compared to those made of steel. That is, in addition to the above-mentioned artificial wood conversion, it is possible to use various finishing materials to impart various colors and textures.

On the other hand, however, concrete products are heavy, so they are clearly inferior to steel products in terms of transportation, construction, etc. Concrete also has the inherent disadvantage of surface cracking, is difficult to assemble on-site, and is considerably inferior to steel for the same size in terms of strength.

This invention improves the design by giving the surface a texture with an uneven pattern that is completely different from metal surfaces, without sacrificing the lightness, strength, and other features inherent to steel.At the same time, it has excellent durability. The purpose is to provide a coated steel protective fence that also has the following properties.

[Problem that the invention attempts to solve]

The coated steel guard fence of the present invention has a sprayed polymer cement mortar layer 3 formed on the surface of the base-treated steel guard fence component 1 as shown in FIG.
It is characterized in that a decorative coating film 4 is applied thereon.

By the way, regarding cement mortar,
Ordinary products cannot be attached even if they are hammered directly onto the steel surface. The only way to hold ordinary cement mortar on a steel surface is to weld wire lath (spot welding) all over the steel surface and have the mortar adhere to this.
Mortar deposited in this manner has problems with durability and may cause surface cracks and cracks.
In addition, factory production increases costs and there are problems such as damage during transportation, so there is a high possibility that construction will be limited to on-site construction. Furthermore, since the rust prevention effect cannot be expected,
Separate surface treatment of the steel material (including wire lath) is required, which inevitably complicates the production process.

However, if you use so-called polymer cement mortar, which is a mixture of polymer as a binding material, it has excellent adhesive properties.
Directly applied to the surface of the steel base material (spraying, etc.) without using lath.
It is possible to obtain sufficient adhesion (adhesiveness) even if the adhesive is used.

In addition, this mortar is applied by spraying with various types of guns, and therefore its surface is formed into a uniform uneven shape.If a decorative film is applied with various paints on top of the mortar, the paint's original appearance will be removed. This will ensure a deep and beautiful texture that matches the character of the person.

In addition, this polymer cement mortar is extremely strong against bending, tension, impact, etc., and has very low water permeability compared to ordinary cement mortar. It can prevent damage such as cracking and peeling as well as corrosion of the steel base material over a long period of time, and can achieve excellent durability.

Below, the coating structure of the rust-proof fence of the present invention will be described as "base treatment" and "polymer cement mortar (abbreviated as PCM)".
The explanation will be divided into three elements: ``layer (inner layer)'' and ``cosmetic coating (surface layer)''.

○ Base treatment In the present invention, base treatment includes not only the formation of a base for the PCM layer as an inner layer, but also surface treatment (anticorrosion treatment) to impart high corrosion resistance to the steel base material itself.

This process is for base formation, except when performing mechanical plating, which will be described later.
Surface polishing with shot blasting or abrasive paper, treatment with pickling or alkaline solutions, roughness adjustment of the steel base material surface by anodizing treatment, etc., or primer coating treatment is carried out, and anti-corrosion treatments include aluminizing, galvanizing, Zinc alloy plating, aluminum spraying, etc. are possible. What is indicated by 2 in FIG. 1 is an anti-corrosion treatment layer.

Among the base treatments, at least one type of treatment for forming the base must be performed, but anticorrosion treatment may be performed as necessary. There are no particular conditions regarding the combination of treatments, and the combination may be selected as appropriate, taking into account the required performance (adhesion of the coating layer, corrosion resistance, etc.). It is also a good idea to perform surface roughness adjustment when necessary. This is because, in addition to contributing to the improvement of adhesion between the original steel material and the PCM layer, the primer treatment film can also be expected to have the effect of preventing moisture that enters through the PCM layer from reaching the steel base material surface. This is because its waterproof effect also effectively prevents rust from forming on the surface of the steel base material. Note that primer treatment does not necessarily need to be used in combination with surface roughness adjustment if good adhesion can be ensured by itself.

A preferred example of the processing procedure is as follows.

Surface scale removal by shot blasting or pickling on the steel surface (black scale).

Application of acrylic resin primer.

In addition to the above-mentioned surface treatments,
A process applying the so-called blast plating method, which is a mechanical plating method, is also possible, and this method is actually the most rational and practical.

That is, it is as follows.

First, a zinc-iron alloy coating is formed by blasting zinc-iron alloy particles onto a steel surface. This coating is thin, about 2 to 5 μm, and porous, so its corrosion resistance cannot be said to be sufficient. However, when this is subjected to chromate treatment or phosphate treatment, the coating is impregnated with the chromate or phosphate treatment agent, and the corrosion resistance is dramatically improved. This is called Z-S processing.

In this Z-S treatment, by blasting zinc-iron alloy particles, an anti-corrosion coating is formed and the surface is
A stable unevenness state with an Rmax of about 15 to 20 μm is provided, and this surface state ensures good adhesion to the inner layer (PCM layer). In other words, it has extremely excellent corrosion resistance and good adhesion.
This means that they can be realized at the same time, and in this respect, they are extremely useful in practice.

○ Inner layer The inner layer applied to the surface of the steel base material that has been subjected to the surface treatment as described above is formed of PCM.

Here, I will explain PCM in a little more detail.

Mortar (or concrete) can be thought of as a two-phase material consisting of cement paste and aggregate as a binding material, but in a broad sense, mortar is a material in which part of this binding material is replaced with a polymer (organic polymer material). It is PCM. Specifically, the following binding materials and aggregates are used.

(1) Binding material A Cement: Portland cement, alumina cement, ultra-fast hardening cement, etc.

B Polymer dispersion (antifoaming agent) SBR latex, PAE/EVA emulsion, etc.

(2) Aggregate Gravel, river sand, silica sand, crushed stone, artificial lightweight aggregate.

However, when the purpose is to prevent corrosion, siliceous crushed stone or silica sand is used.

This PCM shows improvements in various performance aspects compared to ordinary cement mortar. In other words, in terms of general performance, (1) high bending/tensile strength and elongation;

(2) Since the water retention property is good even during curing, hydration of the cement progresses over a long period of time, and long-term strength can be expected to increase.

(3) With the formation of a polymer film, it has a watertight and airtight tissue structure, and has good resistance to water permeation and freeze-thaw resistance.

(4) Good impact resistance and abrasion resistance.

In addition to having these features, it also has good flame retardancy if the type of polymer and polymer/cement ratio are selected.

The present invention focuses on these characteristics and also on the fact that it has good adhesion (adhesiveness) to the surface of metal, and uses it as a covering material especially for steel guard fences. The idea is to add a high level of design (uneven pattern) to the surface.

In other words, if PCM is used, as mentioned above, (1) sufficient adhesion can be ensured just by the above-mentioned surface treatment;

(2) Gun spraying creates a highly virtuosic surface with a uniform uneven pattern.

(3) A coating layer (inner layer) that is strong against the action of external forces (bending, tension, impact, etc.) and has good water permeation resistance is ensured, and the synergistic effect with (1) prevents cracking, peeling, etc. Corrosion can be effectively prevented over a long period of time, and at the same time, high corrosion resistance is exhibited for the steel base material.

The thickness of this layer is not particularly limited, but an average thickness of about 0.5 to 5 mm is appropriate. That is, if the thickness is less than 0.5 mm, sufficient strength of the PCM layer cannot be obtained, and cracking, peeling, etc. may occur. Moreover, if the thickness exceeds 5 mm, it will be necessary to apply (spray) 2 to 3 times in order to maintain the homogeneity of the PCM layer, which will increase the cost.

This layer is formed by spraying with a gun, and any known spray gun such as a mortar gun, a stucco gun, a jiuraku gun, etc. can be used. The unevenness of the surface of the layer changes depending on the type of gun used, so it is only necessary to select and use an appropriate one from the above according to the design requirements. .

○ Surface layer This is a coating film formed as a cosmetic on the above PCM layer. The uneven shape that appears on the surface itself is provided by the PCM layer as an inner layer, but the external design is determined by the uneven shape, together with the color tone and texture of this coating film. Even if the paint itself is a known one, by applying it to the uneven surface and combining it with it, a new design with depth is created.

The paint used is not particularly limited. Any of acrylic resins, urethane resins, fluororesins, etc. can be used, and an appropriate one may be selected from among these known finishing paints depending on the application.

As a result of trial production by the inventors, two examples that were considered to be the most effective in terms of design are shown below.

A urethane resin or acrylic resin paint is applied to an uneven PSM layer using a so-called "suminagashi" method, which is applied to a water surface.

This has a woodgrain-like appearance (see Figure 2), and together with the unevenness of the surface, it has a very deep appearance and gives a soft and warm feel to the touch.

A clear type of special urethane resin paint, mainly made of urethane resin, is used as the paint, and this is applied by spraying with a spray gun.

The surface coating is transparent and has a ceramic-like appearance, while at the same time there is a difference in coating thickness between the concave and convex areas of the inner layer, creating a deep and rich expression. It doesn't feel hard or cold to the touch like metal.

〔Example〕

Figures 2A to 2D show various examples of guard fences to which the present invention is applied, all of which are the above-mentioned examples, and all of the constituent members have a woodgrain appearance.

In the figure, A is a column, B is a handrail, and C is a fence material, which are assembled on site using bolts and nuts D.

In case A, the pillars A and handrails B are rectangular pipes, and the fence material C is based on a U-shaped face plate with a U-shaped cross section with bent upper and lower edges.

Those in B are post A, handrail B, fence material C,
C is all constructed based on round pipes.

The one with C is different only in B and handrail B, with handrail B having a rectangular pipe base attached slightly below the upper end of column A.

Item 2 has a shape that is a combination of A and B, the pillar A is based on a flat pipe, the handrail B is based on a round pipe, and the fence material C is made of two types, A and B. It is being said.

The above is an example of application to guard fences,
The scope of application of the present invention is of course not limited to this, and can be applied to general protective fences in the broad sense mentioned at the beginning.

[Effect of idea]

The features and advantages of the coated steel protective fence of the present invention are listed below.

It has the inherent merits of steel.

It is lightweight, which is advantageous in terms of transportation and construction, and it also has excellent strength, and has the advantage of being able to be assembled on-site.

It has excellent design.

The uneven shape of the inner layer made of PCM appears on the surface, giving the texture a deep expression and a soft feel in the hand. Therefore, it is well suited for parks and residences where conventional steel guard fences are unsuitable due to their inorganic design, and can be expected to contribute to expanding sales channels for steel guard fences. It is.

Since PCM is used as the inner layer, the adhesion between the coating layer and the steel base material (fence component) is good.
The PCM inner layer has high resistance to water permeation, etc., and has the effect of preventing peeling of the coating layer over a long period of time.

The inner layer using PCM has good resistance to bending, tension, and impact, and does not cause cracks or other damage even when subjected to such forces during transportation or installation, and prevents the coating layer from peeling off. Combined with this effect, extremely good durability is exhibited as a result.

Furthermore, when installing guardrails in coastal areas, conventionally, sea salt particles, sand, etc. are blown away by strong winds and violently collide with the guardrails, causing the coating on the surface to wear away and peel off, which covers the steel material. The paint film disappears, rust prevention ability disappears or decreases, and rust occurs early. However, if PCM is coated on top of the plating layer, for example, the highly durable PCM will protect the underlying plating layer. This will provide long-term rust prevention effect.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a covering structure based on the present invention, and FIGS. 2A to 2D are overall views showing four examples of guard fences to which the present invention is applied. In the figure, 1...Fence component (steel base material), 2...Anti-corrosion treatment layer, 3...PCM layer (inner layer), 4... Decorative coating film (surface layer).

Claims (1)

[Scope of utility model registration request] A decorative material-coated steel guard fence characterized in that a sprayed polymer cement mortar layer 3 is formed on the surface of each constituent member of the steel guard fence which has been subjected to surface treatment, and a decorative coating film 4 is applied thereon.