JPH0631071Y2 - Branch line rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a bar-shaped metal object generally called a branch line rod, which is used when fixing a branch line provided for the purpose of preventing collapse of an electric pole to the ground.

(Prior Art) As a conventional branch line rod, a material made of hot-dip galvanized steel is used. FIG. 3 shows that by using the branch line rod 1, the branch line 3 and the concrete block 4 buried in the ground are covered with washers 5 to prevent the utility pole 2 from falling.
It is the figure which showed the state fixed via.

However, in the highly corrosive soil, there are occasional cases where the underground part of the branch rod rod is corroded and broken in a short period of time, and the electric pole falls down, which is an important safety issue.

Therefore, in order to prevent corrosion of this branch rod, it was attempted to apply an anticorrosive paint such as an epoxy-based paint on the plating, but it is easily impacted by a large impact such as crushed stone during burying. The paint came off, and the desired effect could not be obtained.

Furthermore, vinyl chloride baking coating by deep coating was investigated as a strong coating. As a result, the coating was cracked due to the impact of crushed stones during backfilling, and it was judged to be insufficient as an anticorrosion coating.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned drawbacks, and an object thereof is to provide a branch line rod having an anticorrosion coating having good corrosion resistance and good impact resistance.

(Means for Solving the Problems) The branch rod of the present invention is provided with a high corrosion-resistant organic coating layer as the first layer on the surface of the galvanized layer of the conventional branch rod, and the entire surface or the impact is greatly increased. A protective layer made of an organic material that absorbs impact or a protective layer made of a metal material is formed as a second layer on the part to be received.

Embodiment 1 FIG. 1 is a view for explaining a first embodiment of the present invention,
FIG. 1 (a) shows a side cross section of a branch rod of the present invention.
FIG. 2B shows a cross section taken along the line AA ′ in FIG. First
In the figure, 1 is a conventional branch line rod which is hot-dip galvanized, 6 is an epoxy acrylic anticorrosion layer having a thickness of 100 μm, and 7 is a shock absorbing layer of PVC plastisol having a thickness of 1 mm.

As a method of manufacturing the branch line rod, the conventional branch line rod 1 is coated with an epoxy acrylic coating of 100 μm and baked to form the anticorrosion layer 6, and then a plastisol containing PVC as a main component is applied to a thickness of 1 mm. Then, the impact absorbing layer is formed by firing.

Epoxy acrylic paints have excellent adhesion to metals, good water resistance, and excellent corrosion resistance, but are easily damaged by mechanical impact. However, the impact absorbing layer of PVC plastisol on this cushions the mechanical impact, thus preventing damage to the anticorrosion layer.

In order to confirm the effect of the branch rod of this example, a drop weight impact test was performed using a hemispherical weight having a curvature of 10 mm and a weight of 1 kg. In the case of a single anticorrosion layer, the height from 10 cm was used. While the falling weight showed a scratch reaching the surface of the zinc-plated layer of the base material, in the case of this example, the falling weight from a height of 100 cm did not show a scratch reaching the base material.

Embodiment 2 FIG. 2 is a side sectional view showing a structure of a branch line rod of a second embodiment of the present invention, in which 1 is a conventional branch line rod which is hot dip galvanized and 8 is a thickness of 400 μm. A saturated polyester anticorrosive layer, and 9 is a shock absorbing layer made of a soft PVC resin having a thickness of 1 mm.

This branch line rod is manufactured by baking saturated polyester powder on the conventional branch line rod 1 by a usual method to form a 400 μm thick anticorrosion layer, and then forming a soft PVC sheet with a thickness of 1 mm or a straight line portion of the branch line rod. A soft PVC tube having the same inner diameter as the diameter and a wall thickness of 1 mm is cut in the length direction and bonded with a PVC adhesive to form a shock absorbing layer. In this embodiment, the impact absorbing layer is formed only on the portion that is particularly susceptible to impact during backfilling.

Powder baking of saturated polyester has good adhesiveness and excellent corrosion resistance, but if the impact force is large, cracks are likely to occur, and there is a risk that water will penetrate from there and corrosion will progress. It is the impact of crushed stones during backfilling that the branch rod receives a large impact force. Therefore, if a simple impact absorbing layer 9 is provided only on the portion where the crushed stones are easily hit, the problem of cracking due to impact is solved. . As a result, the excellent corrosion resistance of the anticorrosion layer 8 composed of the saturated polyester baked coating is effectively utilized. When the same falling weight impact test as in Example 1 was carried out, when the anticorrosion layer 8 alone was used, a weight drop from a height of 30 cm caused cracking in the coating, but with the method of this Example, a height of 1 m was applied. No damage was observed on the anticorrosion layer 8 even with the falling weight. It should be noted that the same effect can be obtained by laminating a thin metal plate as the shock absorbing layer 9 in Example 2 with an adhesive such as epoxy resin.

(Effect of the Invention) As described above, the branch rod of the present invention is provided with the anticorrosion layer having excellent corrosion resistance and the impact absorption layer for protecting the anticorrosion layer from damage due to mechanical impact. Therefore, it is possible to avoid damage to the anticorrosion layer due to the impact of crushed stones at the time of backfilling, and the original performance of the anticorrosion layer is utilized, so that the occurrence of corrosion is prevented for a long time even in corrosive soil, A significant improvement in safety can be expected.

In addition, the branch rod of the present invention functions as an anticorrosion coating by distributing the functions of an original anticorrosion layer and a shock absorbing layer for protecting it from damage caused by mechanical external force, so that it can be used as a conventional branch rod. As compared with the case where the coating of one layer has both the corrosion resistance and the impact resistance, the cost and the corrosion resistance can be reduced.

[Brief description of drawings]

1 (a) is a side sectional view showing the structure of a branch rod of the first embodiment of the present invention, FIG. 1 (b) is a sectional view taken along the line AA 'in FIG. 1 (a), and FIG. FIG. 3 is a side sectional view showing the structure of a branch rod according to a second embodiment of the present invention, and FIG. 3 is a conceptual view of how the branch rod is actually used. 1 ... Conventional branch line rod, 2 ... Utility pole 3 ... Branch line, 4 ... Concrete block 5 ... Washer 6 ... Epoxy acrylic anticorrosion layer 7 ... PVC plastisol impact absorption layer 8 ... Saturated polyester anticorrosion layer 9 ...... Soft PVC resin shock absorbing layer

Front page continuation (72) Inventor Yukio Kimura 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nihon Telegraph Telephone Co., Ltd. (72) Kanichi Ogawa 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nihon Telegraph Telephone Co., Ltd. (72) Inventor Kazuhiko Sugimoto 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (1)

[Scope of utility model registration request] 1. An organic anticorrosion layer is formed on the surface of galvanized steel, and an impact absorption layer is provided on the organic anticorrosion layer to prevent damage to the organic anticorrosion layer due to mechanical impact. A branch rod to be used.