Metal pipe column

Abstract

To provide a metal pipe column which can improve durability of a taper metal pipe provided at an embedment part without causing a higher price and a long delivery period, and which has excellent economical efficiency, and also to provide the metal pipe column which can further improve durability by preventing or suppressing potential corrosion, by considering a natural potential (difference) of metal related to the embedment part, and which has excellent quality.SOLUTION: A metal pipe column 1 is constituted by joining a plurality of taper metal pipes 10. The taper metal pipe 10 has a constitution in which the diameter is expanded downward in a taper-shape, and by the taper metal pipe 10 on the lower stage being inserted in the taper metal pipe 10 on the upper stage, an inner surface of the taper metal pipe 10 on the upper stage and an outer surface of the taper metal pipe 10 on the lower stage are held in a surface-contact manner. A taper metal pipe 10N provided at an embedment part is made of stainless steel or titanium.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technical field of metal pipe poles (steel assembly poles) which are constructed by joining together multiple tapered metal pipes to form a single pole and then installed on the ground. More specifically, the present invention relates to metal pipe poles which are erected by embedding the lower part and are used as utility poles, lighting poles, disaster prevention administrative radio poles, etc. [Background technology]

[0002] Metal pipe poles, which are erected by embedding the lower part and used for utility poles, lighting poles, disaster prevention administrative radio poles, etc., all require a considerable height and a large total weight. For this reason, metal pipe poles are often divided into multiple tapered metal pipes, which are then transported to the site to facilitate transportation, and then joined together on site to form a single metal pipe pole (see, for example, Patent Document 1).

[0003] The metal pipe support according to Patent Document 1 is a metal pipe support constructed by joining together a plurality of tapered metal pipes, each of which is tapered downward in diameter, and a lower tapered metal pipe is inserted into an upper tapered metal pipe, thereby forming a structure in which the inner surface of the upper tapered metal pipe and the outer surface of the lower tapered metal pipe are held in surface contact (see description of Claim 1, etc.). The metal pipe support pillars constructed by joining together the above-mentioned multiple tapered metal pipes are pipe bodies made of metal such as steel or aluminum, and when they are constructed of steel, the surface is treated with hot-dip galvanizing or the like (see paragraph

[0022] of the same document 1), and the base section is often protected from corrosion by an epoxy-based paint. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-191213 Summary of the Invention [Problem to be solved by the invention]

[0005] The epoxy coating used as a corrosion prevention measure for the aforementioned embedded parts has a durability of about 10 years, and there have been cases where only the embedded parts corrode due to moisture underground or corrosion at the ground level, leading to collapse due to vibrations from earthquakes or typhoons, etc. Durability can be improved by applying a thick polyurethane resin coating of more than 1000 μm, but because there are only a limited number of coating factories, there are issues such as high prices and long delivery times due to the need to transport the product between factories.

[0006] Therefore, the present invention has been devised in view of the problems of the background art described above, and its object is to provide an economical metal pipe support that can improve the durability of a tapered metal pipe to be installed in an insertion portion without incurring high prices or long delivery times. Furthermore, the present invention aims to provide a high-quality metal pipe support that can further improve durability by taking into account the natural potential (difference) of the metal at the embedded portion and preventing or suppressing potential difference corrosion. [Means for solving the problem]

[0007] As a means for solving the above problem, the metal pipe support described in claim 1 is a metal pipe support formed by joining a plurality of tapered metal pipes, Each tapered metal tube has a diameter that tapers downward, and the tapered metal tube of the lower stage is inserted into the tapered metal tube of the upper stage, so that the inner surface of the tapered metal tube of the upper stage and the outer surface of the tapered metal tube of the lower stage are held in surface contact, The tapered metal tube provided in the insertion portion is characterized by being made of stainless steel or titanium.

[0008] The invention described in claim 2 is characterized in that, in the metal pipe support described in claim 1, an electrical insulation means is provided, such as by applying an electrical insulating paint to the contact surface between the lower tapered metal pipe made of stainless steel or titanium and the upper tapered metal pipe made of a different material from the tapered metal pipe.

[0009] The invention described in claim 3 is characterized in that, in the metal pipe support described in claim 2, the electrically insulating paint is made of one or a combination of two or more of epoxy resin paint, polyurethane resin paint, fluororesin paint, acrylic resin paint, polyester resin paint, and nylon resin paint. [Effects of the Invention]

[0010] The metal pipe support according to the present invention has the following advantages. (1) By using stainless steel or titanium for the tapered metal pipe installed in the embedded portion of a metal pipe support, it is possible to realize a tapered metal pipe with excellent corrosion resistance that can prevent corrosion of the ground portion and the embedded portion while suppressing an increase in cost, and ultimately to realize a longer life for the metal pipe support. (2) Furthermore, by using stainless steel or titanium for the tapered metal pipe at the insertion section, the conventional painting process such as hot-dip galvanizing and the need to hold the product horizontally are no longer necessary, shortening the manufacturing process. This allows for the realization of an economical tapered metal pipe, and ultimately a metal pipe support. (3) Furthermore, by applying an electrical insulation measure such as applying an electrical insulating paint to the contact surface between the lower tapered metal tube made of stainless steel or titanium and the upper tapered metal tube made of a different material to the lower tapered metal tube, potential corrosion (corrosion from the inner surface of the component) of the upper tapered metal tube that has been treated with hot-dip galvanization or the like can be prevented or suppressed, thereby realizing a metal tube support with excellent durability and quality. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1A is an elevational view showing the overall configuration of a metal pipe support according to the present invention, and FIG. 1B is an exploded view showing each tapered metal pipe before assembly of the metal pipe support. [Figure 2]1A and 1B are explanatory diagrams showing, in stages, the procedure for joining a lower tapered metal pipe to be installed in the insertion portion of the metal pipe support of FIG. 1 with an upper tapered metal pipe made of a different material. [Figure 3] 1A and 1B are explanatory diagrams showing step-by-step variations in the joining method between a lower tapered metal pipe to be installed in the root portion of the metal pipe support shown in FIG. 1 and an upper tapered metal pipe made of a different material. [Figure 4] 1A and 1B are explanatory diagrams showing step-by-step variations in the joining method between a lower tapered metal pipe to be installed in the root portion of the metal pipe support shown in FIG. 1 and an upper tapered metal pipe made of a different material. [Figure 5] FIG. 1A is an elevation view showing a variation of the overall configuration of a metal pipe support according to the present invention, and FIG. 1B is an exploded view showing each tapered metal pipe before assembly of the metal pipe support. [Figure 6] FIG. 1A is an elevation view showing a variation of the overall configuration of a metal pipe support according to the present invention, and FIG. 1B is an exploded view showing each tapered metal pipe before assembly of the metal pipe support. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention is based on a novel technical idea that involves innovating the structure, and more specifically the material, of the tapered metal pipes that make up the metal pipe supports installed above ground, which are installed at the root sections. Furthermore, the present invention is based on an unprecedented technical idea in which, in order to solve new problems that may arise as a result of devising new materials for the tapered metal pipes to be installed in the insertion section, the joint (surface contact section) between the lower tapered metal pipe installed in the insertion section and the upper tapered metal pipe installed on the ground has been devised. In this specification, the term "tapered metal pipe to be installed in the embedded portion" is used to mean not only a tapered metal pipe whose entire length (full length) is buried in the ground, but also a tapered metal pipe whose lower part is buried in the ground.

[0013] Hereinafter, an embodiment of a metal pipe support according to the present invention will be described with reference to the drawings.

[0014] As shown in FIG. 1, the metal pipe support 1 according to the present invention is a metal pipe support 1 constructed by joining together a plurality of tapered metal pipes 10, wherein each of the tapered metal pipes 10 is tapered downward, and a lower tapered metal pipe 10 is inserted into an upper tapered metal pipe 10, thereby holding the inner surface of the upper tapered metal pipe 10 and the outer surface of the lower tapered metal pipe 10 in surface contact, and the tapered metal pipe 10N provided in the insertion portion is made of stainless steel or titanium.

[0015] Specifically, among the tapered metal pipes 10, the tapered metal pipe 10N, which is buried in whole or in part underground, is made of stainless steel or titanium, while the tapered metal pipe 10U, which is used with the entire pipe exposed above ground, is made of a pipe body made of a general metal such as steel other than stainless steel or titanium, aluminum, etc. For example, in the metal pipe support 1 of Figure 1, the two tapered metal pipes 10 in the second row from the bottom are buried in whole or in part in the ground, and are therefore implemented as tapered metal pipes 10N made of stainless steel or titanium; in the metal pipe support 1 of Figure 5, the single tapered metal pipe 10 in the bottom row is partially buried in the ground, and is therefore implemented as tapered metal pipes 10N made of stainless steel or titanium; and in the metal pipe support 1 of Figure 6, the three tapered metal pipes 10 in the third row from the bottom are partially buried in the ground, and are therefore implemented as tapered metal pipes 10N made of stainless steel or titanium.

[0016] In this embodiment, the tapered metal tube 10N is made of stainless steel, and the tapered metal tube 10U is made of steel. The surface of the tapered metal tube 10U made of steel is hot-dip galvanized. The number and size of each tapered metal tube 10 constituting the metal tube support 1 are of course subject to appropriate design changes depending on the structural design.

[0017] Therefore, according to the metal pipe pillar 1 of this embodiment, by making the tapered metal pipe 10N provided in the root portion of the metal pipe pillar 10 out of stainless steel or titanium, it is possible to realize a tapered metal pipe 10 with excellent corrosion resistance that can prevent corrosion of the ground portion and the root portion while suppressing an increase in cost. As a result, it is possible to realize a longer lifespan of the metal pipe pillar 1. Furthermore, by using stainless steel or titanium for the tapered metal pipe 10 to be installed at the insertion portion, the conventional painting process such as hot dip galvanizing and the need to hold the product horizontally are no longer necessary, thereby shortening the manufacturing process. As a result, an economical tapered metal pipe 10 and, ultimately, a metal pipe support 1 can be realized.

[0018] The present invention further provides electrical insulation means such as applying electrical insulating paint 2 and / or 3 to the contact surface between the lower tapered metal tube 10N made of stainless steel or titanium and the upper tapered metal tube 10U made of a material different from the tapered metal tube 10N (i.e., made of a common metal such as steel or aluminum other than the stainless steel or titanium) (see Figures 2 to 4). The reason for providing the electrical insulating means is to prevent the generation of corrosion current due to the potential difference between stainless steel and titanium, which have a high potential, and iron and zinc, which have a low potential. Incidentally, in the metal pipe support 1 of Figure 1, an electrical insulation means is provided at the joint (surface contact portion) between the second tapered metal pipe 10N from the bottom and the third tapered metal pipe 10U, in the metal pipe support 1 of Figure 5, an electrical insulation means is provided at the joint (surface contact portion) between the bottommost tapered metal pipe 10N and the second tapered metal pipe 10U from the bottom, and in the metal pipe support 1 of Figure 6, an electrical insulation means is provided at the joint (surface contact portion) between the third tapered metal pipe 10N from the bottom and the fourth tapered metal pipe 10U.

[0019] In this embodiment, as shown in Figures 2 to 4, electrical insulation means is provided by applying electrical insulating paint 2 and / or 3 to the surface contact portion between the lower tapered metal tube 10N and the upper tapered metal tube 10U. In Figure 2, electrical insulating paint 2 is applied to the inner surface of the upper tapered metal tube 10U, which is in surface contact with the other tubes; in Figure 3, electrical insulating paint 3 is applied to the outer surface of the lower tapered metal tube 10N, which is in surface contact with the other tubes; and in Figure 4, electrical insulating paint 2 is applied to the inner surface of the upper tapered metal tube 10U, which is in surface contact with the other tubes, and electrical insulating paint 3 is applied to the outer surface of the lower tapered metal tube 10N.

[0020] Specifically, the electrical insulating paints 2 and 3 are made of one or a combination of two or more of epoxy resin paint, polyurethane resin paint, fluororesin paint, acrylic resin paint, polyester resin paint, and nylon resin paint. The film layer is preferably about 30 to 300 μm thick. For example, the electrical insulating coating 2 applied to the inner surface of the upper tapered metal tube 10U is not affected by ultraviolet rays, so an epoxy resin coating (single layer) that has high adhesion to the hot-dip galvanized surface is economical, rational, and preferable. Specifically, in this example, a modified epoxy resin coating is used, and the coating is applied to a standard film thickness of 70 μm. On the other hand, since the electrical insulating paint 3 applied to the outer surface of the lower tapered metal tube 10N is exposed to ultraviolet rays, it is preferable to apply it in multiple layers, such as by applying an epoxy resin paint (undercoat), then applying a polyurethane resin paint (topcoat), and then applying a fluororesin paint (topcoat) on top of that.

[0021] Therefore, a metal pipe pillar 1 that is provided with the electrical insulation means and is installed on the ground by sequentially joining multiple tapered metal pipes 10 to form a single pillar not only achieves the above-mentioned effects (see paragraph

[0017] above), but also prevents or suppresses potential corrosion (corrosion from the inner surface of the component) of the upper tapered metal pipe 10U that has been treated with hot-dip galvanizing or the like, thereby realizing a metal pipe pillar 1 that is superior in durability and quality.

[0022] Although the embodiments have been described above based on the drawings, it should be noted that the present invention is not limited to the illustrated embodiments, but includes the range of design modifications and application variations that are normally made by those skilled in the art, provided that they do not deviate from the technical concept thereof. For example, in order to improve the efficiency of the assembly work, appropriate measures may be taken, such as marking the outer surfaces of the tapered metal tubes 10, 10 to be joined together to make alignment easier. [Explanation of symbols]

[0023] 1 Metal tube support 10 Tapered metal tube 10N Tapered metal pipe installed at the insertion part 10U Tapered metal pipe installed above ground 2 Electrical insulating paint 3 Electrical insulating paint

Claims

1. A metal pipe support constructed by joining a plurality of tapered metal pipes, Each tapered metal tube has a diameter that tapers downward, and the tapered metal tube of the lower stage is inserted into the tapered metal tube of the upper stage, so that the inner surface of the tapered metal tube of the upper stage and the outer surface of the tapered metal tube of the lower stage are held in surface contact, A metal pipe support, characterized in that the tapered metal pipe provided in the root portion is made of stainless steel or titanium.

2. 2. A metal pipe support as described in claim 1, characterized in that an electrical insulation means such as an electrical insulating paint is applied to the contact surface between the lower tapered metal pipe made of stainless steel or titanium and the upper tapered metal pipe made of a material different from the lower tapered metal pipe.

3. 3. The metal pipe support according to claim 2, wherein the electrically insulating paint is made of one or a combination of two or more of epoxy resin paint, polyurethane resin paint, fluororesin paint, acrylic resin paint, polyester resin paint, and nylon resin paint.

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