JPH11122766A - Pole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably shorten the earth wire exposed to the outside of a pole to surely obtain grounding with good appearance, by providing an earth terminal on the surface of pole consisting of reinforcing steel and concrete, and then electrically connecting the earth terminal to the reinforcing steel. SOLUTION: An earth terminal 4 is previously provided to cage type reinforcing steels 2, 3 by welding 9. The earth terminal is buried at two positions to the upper and lower underground areas of the pole. The earth terminal 4 is formed of a metal material having a cylindrical shape in which a threaded hole enabling screwing of a bolt type plug 6 is provided. Here, concrete 1 is applied around the reinforcing steels 2, 3, thereby exposing the external side of earth terminal 4 to the surface of pole. The end portion of an earth wire 8 has an annular connector 7 and is connected to the earth terminal 4 with a bolt plug 6. Therefore, the earth wire 8 is electrically connected to the reinforcing steel 2 via the connector 7 and the earth terminal 4, and the reinforcing steel 2 itself is working as the earth wire. As a result, it is no longer required to provide a longer earth wire along the surface of pole preventing deterioration and breaking of the earth wire.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced concrete electric pole.

[0002]

2. Description of the Related Art In recent years, reinforced concrete electric poles have become the mainstream in place of conventional wooden electric poles. Such an electric pole is composed of a reinforcing bar (a longitudinal bar extending in the axial direction and a horizontal bar (hoop bar) arranged perpendicular to the vertical bar) woven like a cylindrical cage inside a cylindrical mold. ), Apply tension in the axial direction, then pour the concrete, rotate the mold until the concrete hardens, centrifugally force the concrete to concentrate on the inner circumference of the mold, and the concrete will move around the rebar. The arranged hollow cylindrical pole is formed. After hardening, the steel bars protruding from the upper and lower ends of the pole are cut, and the poles are completed by closing the upper and lower ends of the pole with concrete so as to cover the pole.

When installing a utility pole, as shown in FIG. 8, a drilling hole (14) is provided in the ground, and an installation rod (12) is embedded downward from the bottom of the drilling hole (14). Then, a ground resistance reducing material (11) is arranged at the bottom of the excavation hole (14) so as to be in contact with the installation rod (12).

[0004] An electric pole is erected on the ground resistance reducing material (11) of the excavation hole (14), and the electric pole and the excavation hole (13) are formed by backfilling material (13) such as soil generated when excavating the excavation hole. Fill in between 14).

A utility pole having a pole transformer (15), a lightning rod (16), and the like is provided with a ground wire (8 ') for grounding. And is connected to an underground ground resistance reducing material (11). Insulation covers made of resin, etc. for insulation and damage prevention (10
´) is attached.

However, there is a problem that the long ground wire (8 ') extending outside the telephone pole is not only poor in appearance but also easily deteriorated by wind and rain. Also, the insulating cover (10 ') for protection is inevitably long.

[0007]

Therefore, there is a need for a utility pole that can improve the appearance by reducing the exposure of the ground wire and can reliably ground the ground.

[0008]

According to the present invention, there is provided a power pole comprising:
Composed of (2), (3) and concrete (1), ground wire on the surface
An earth terminal (4) to which (8) can be connected is provided, and the earth terminal (4) is electrically connected to the reinforcing bar (2).

In the above, a sealing material (5) is provided between the ground terminal (4) and the surrounding concrete (1).

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to preferred embodiments. [Embodiment 1] FIG. 1 is a view showing a state in which a telephone pole of this embodiment is installed.

At the time of manufacture, a ground terminal (4) is previously attached to the basket-shaped reinforcing bars (2) and (3) by welding (9). Attachment was made at two locations, one at the upper part of the utility pole and the other at the lower part embedded in the ground. Concrete (1) around reinforcing bars (2) and (3)
, The outside of the ground terminal (4) is exposed on the telephone pole surface. FIG. 2 is a longitudinal sectional view showing an example of the arrangement of the ground terminals, and FIG. 3 is a transverse sectional view of the same. The ground terminal of this embodiment is made of metal, and has a shape of a bolt-like plug (6) described later.
Was formed into a cylindrical shape having a thread groove capable of being screwed therein.

When rainwater enters from between the ground terminal (4) and the concrete (1), there is an adverse effect such as rusting of the reinforcing steel.
A sealing material (5) is arranged at least around the surface of the utility pole among the portions of the ground terminal (4) in contact with the concrete (1).

Before the concrete is poured, the sealing material (5) is disposed in advance at a location of the earth terminal (4) in contact with the concrete (1). As the sealing material (5), a paste-like silicone caulking material or a thick double-sided tape-like material can be used.

An end of a ground wire (8) connected to a lightning rod (16) or the like has a ring-shaped connection portion (7) for attaching to a ground terminal. Connect this connection (7) with a bolt-shaped plug
Connected to earth terminal (4) at (6). Therefore, the ground wire (8) is connected to the reinforcing bar (2) through the connection (7) and the ground terminal (4).
The rebar (2) itself serves as a ground wire. As a result, there is no need to provide a long ground wire along the surface of the utility pole. As a result, the ground wire is prevented from being damaged or deteriorated, and the reliability of the ground is surely further improved. In addition, a long cover is no longer necessary.

Since the ground must be connected to the grounding resistance reducing material (11) provided at the bottom of the excavation hole (14), the ground is connected to the ground terminal (4) provided at a place embedded in the ground of the telephone pole. The wire (8) was connected with the plug (6), and the other end of the ground wire (8) was connected to the ground resistance reducing material (11). Here, the reason why the ground terminal (4) for drawing out the ground is provided in the ground is to minimize the exposure of the ground wire (8) on the ground to the outside of the telephone pole.

[0016] Then, the backing material (13), the utility pole (13) and the excavation hole
Fix the utility pole by filling in between (14).

In this embodiment, the ground terminal (4) has a length from the surface to the reinforcing bar. However, the ground terminal (4) may have a length from the surface to the inside of the reinforcing bar (for example, a hollow portion inside a utility pole). FIG. 4 is a longitudinal sectional view showing an example of the arrangement of the ground terminals having such a shape, and FIG. 5 is a transverse sectional view of the same.

[Embodiment 2] FIG. 6 shows this embodiment. In this embodiment, the lower ground terminal (4) is different from that of the first embodiment.
Position is different. That is, in the first embodiment, it is provided at a place that is underground at the time of installation.
It was provided in the place of the degree.

This is because the lower ground terminal (4) is also used as an inspection terminal for measuring a leakage current of an insulator, a transformer (15) or the like. A ground wire (8) is arranged outside the utility pole up to the resistance reducing material (11). The installation position is set to about 3 m above the ground in order to prevent a passerby or the like from touching or a child from playing pranks.

Reference numeral (10) denotes a resin cover for protecting and insulating the ground wire (8) from the lower ground terminal (4) to the ground. The cover (10) may be arranged only around the ground wire (8), or may surround the lower ground terminal (4) if there is no problem in the inspection. In addition, if the lockable openable cover (10) is used, as long as the key is not opened, there is no risk of a pedestrian coming into contact with the lower ground terminal (4), so the lower ground terminal (4) is lower than the ground. It can be provided at a position (for example, 1 m above the ground), and the inspection can be performed efficiently.

[0021]

As described above, according to the present invention, the length of the ground wire exposed to the outside of the telephone pole can be greatly shortened, which is preferable in appearance and can be reliably grounded.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment.

FIG. 2 is a longitudinal sectional view showing an example of arrangement of ground terminals.

FIG. 3 is a cross-sectional view showing an example of arrangement of ground terminals.

FIG. 4 is a longitudinal sectional view showing an example of the arrangement of ground terminals having different shapes.

FIG. 5 is a cross-sectional view showing an example of the arrangement of ground terminals having different shapes.

FIG. 6 is a diagram showing a second embodiment.

FIG. 7 is a diagram showing a conventional example.

[Explanation of symbols]

 (1) Concrete (2) Reinforcing bar (vertical bar) (3) Reinforcing bar (horizontal bar) (4) Ground terminal (5) Seal material (6) Plug (7) Ground wire connection (8) Ground wire (9) Welding point (10) Cover (11) Grounding resistance reducing material (12) Ground rod (13) Backfill material (14) Drilling hole (15) Pole transformer (16) Lightning rod

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ryoji Miyamoto 6-2-27 Nakanoshima, Kita-ku, Osaka-shi Inside Kansai Tec (72) Inventor Hajime Imai 6-27, Nakanoshima, Kita-ku, Osaka-shi Shares Company Kansai Tec

Claims (2)

[Claims] 1. A utility pole comprising a reinforcing bar and a concrete, and a ground terminal provided on a surface thereof to which a ground wire is connectable, wherein the ground terminal is electrically connected to the reinforcing bar. 2. The utility pole according to claim 1, wherein a sealing material is provided between the ground terminal and surrounding concrete.