JPH0249366A - Construction of earth pipe - Google Patents

Abstract

PURPOSE:To ensure the strength of a connection part, enhance ease for a connection work and reduce machining cost by pressing and jointing the ends of each earth pipe for an earth electrode comprising a plurality of jointed earth pipes using a coupling piece. CONSTITUTION:Earth pipes 1 having good conductivity and the predetermined length are connected to each other via a connection piece 4 coupled to one end thereof and fitted with a lead fixing terminal 5 on top hereof, thereby forming an earth electrode. For a jointing work, the earth pipes 1 are jointed in the preliminarily punched vertical hole while pressing the connection piece 4 and the predetermined number of the earth pipes are jointed. The jointed part is fixed by pressing with a hydraulic caulking machine and the like. The required work, therefore, is simple and reliable. Also, the jointed part is free from such corrosion as in a screwed connection and sturdy connection becomes available.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a grounding system installed underground to protect various electrical equipment and facilities from abnormal high voltage currents caused by snow damage, etc. The present invention relates to the (earth) electrode, and more specifically, to the structure of the earth pipe that constitutes the earth electrode.

(Conventional technology) When a particularly low resistance value is required for grounding, a vertical hole is drilled using a polling machine to reach a good battery layer deep underground.
An effective method is to insert and bury, for example, pipe-shaped (rod-shaped) grounding rods (hereinafter abbreviated as earth pipes) made of a good conductive metal into the vertical hole.

In order to further ensure its effectiveness, a solution of grounding resistance reducing agent (hereinafter referred to as
It is abbreviated as a reducing agent. ) is injected and cured after a certain period of time, and a good contact state between the earth pipe and the soil on the inner wall of the vertical hole is maintained via the reducing agent.

(Problems to be Solved by the Invention) According to the above-mentioned conventional technology, the process of inserting an earth pipe into a vertical hole drilled by a polling machine while adding the earth pipe is as follows.

First, a vertical hole is excavated to the required depth using a poling machine, and then a reducing agent is injected through a hollow boring rod to remove the circulating water used for poling inside the vertical hole. In other words, when the reducing agent passes through the boring rod and is ejected from the tip of the drilling bit, the reducing agent has a specific gravity several orders of magnitude higher than the circulating water, so it pushes up the circulating water from below the vertical hole, and eventually the entire amount is discharged out of the hole, and the reducing agent stays in the vertical hole instead.

After that, the boring rod is quickly pulled up from the vertical hole, and a predetermined length of earth pipe is successively inserted into the vertical hole where the reducing agent accumulates, and the earthing (grounding) is completed after the reducing agent hardens.

In this case, the depth of excavation of the vertical hole formed by poling may reach more than 100 m, and it is required to improve the efficiency of the work of successively connecting and burying earth pipes of a predetermined length. Needless to say, consideration must be given to improving work efficiency and ensuring that sufficient grounding characteristics are obtained over the long term.

Conventionally, when connecting multiple earth pipes of a predetermined length to form a ground electrode, the connection method was screw connection.
There are disadvantages such as (1) unstable contact in screw connections, (2) easy corrosion of screw connections, and (3) high processing costs, and it is difficult to develop a more appropriate connection method. I'm falling over again.

[Structure of the invention]

Means for Solving Problem C) To summarize the present invention, the present invention connects a plurality of edible conductive earth pipes of a predetermined length, and connects a plurality of edible conductive earth pipes with a In the structure of a ground pipe for a ground electrode in which a lead wire is fixed, the food-shaped conductive ground pipe (1) of the predetermined length has a crimp fixing part (2) at one end.
A crimping part (3) for crimping and fixing a connecting protrusion (4) for connecting an earth pipe to the other end, and fitting and crimping a connecting protrusion (4) for connecting an earth pipe that is crimped and fixed to another earth pipe at the other end.
The present invention relates to a structure of a ground pipe for a ground electrode, which is characterized in that it is provided with a ground pipe.

Hereinafter, the configuration and embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a front view showing the structure of the earth pipe (1) of the present invention.

The earth pipe (1) of the present invention is of a predetermined length made of an edible conductive metal tube, and the crimp-fixed part (2) at one end is an earth pipe for efficiently connecting a plurality of earth pipes. A crimping part (3) for crimping and fixing the connecting connecting protrusion (4), and fitting and crimping the earth pipe connecting connecting protrusion (4) that is crimped and fixed to another earth pipe at the other end.
It has a structure with

When connecting a plurality of the above-mentioned earth pipes (1) of the present invention, the crimp part (
3) is fitted with a connecting protrusion (4) for connecting the earth pipe which is crimped and fixed to another earth pipe (1), and the crimped part (3) is crimped with a hydraulic tightening machine or the like to connect. do it.

Figure 2 shows a plurality of earth pipes (one
) is connected, and is related to the structure of the lead terminal (5) used to fix the grounding lead wire to the end of the last earthing pipe (1), and is a partially broken front view. It is.

As shown in FIG. 2, the lead wire fixing terminal (5) is
From the lead wire fixing part for fixing the lead wire fixing terminal connecting protrusion (4') for crimping and fixing the lead wire fixing terminal (5) to the end of the last earth pipe (1) and the lead wire (6). It is what it is.

Although FIG. 2 shows a lead wire fixing section in which the lead wire is inserted into a recess and fixed therein, the present invention is not limited to this structure.

Next, an example of a method of sequentially connecting the earth pipes (1) of the present invention to form an earth electrode will be described.

In order to sequentially connect and bury the earth pipes (1) of the present invention to form an earth electrode, first, as shown in FIG. A hole is drilled, and then a drilled pipe (7) is inserted into the vertical hole.
to be poured. FIG. 3 shows a cross-sectional view of the excavation pipe (7) installed in the soil in this manner.

In Fig. 3, (8) indicates the bit attached to the tip of the excavation pipe (7) (bit corresponding to the excavation blade), and (9)
indicates a connecting screw for connecting said thread (8) to the excavation pipe (7).

Then, as shown in FIG. 4, the next work step is started.

(+) Multiple earth pipes (
1, 1,...) to the connecting beam for connecting the earth pipe (4, 4
,...) are inserted while concatenating.

(ii) From the rear of the excavation pipe (7), reducer (10)
Pour in.

(iii) Simultaneously with pouring the reducing agent in (ii) above,
Gradually pull out the excavation pipe leaving only the tip (8) intact.

(iv) The reducing agent is caused to flow out from the opening at the tip of the excavation pipe (7) and sequentially filled from the bottom into the vertical hole created by pulling up the excavation pipe. By this operation, the circulating water for poling used during the polling operation and staying in the vertical hole can be completely replaced with the reducing agent whose specific gravity is several times higher than the circulating water.

(v) By curing the reducing agent, the earth pipe (1,1
,...) are connected in series.
Maintain good contact with the soil on the inner wall of the vertical hole.

(Vi) Finally, the earth wire fixing terminal (5) shown in FIG. 2 is fixed to the end of the last earth pipe (1).

As described above, the construction of the earth electrode is completed, and FIG. 5 shows a cross-sectional view at the time when the construction is completed.

In Figure 5, (11) shows the hardening agent in the vertical hole, and (12) shows the inner wall surface of the vertical hole, which was formed by pulling out the excavated pipe (7). The state in which the reducing agent is hardened between the periphery of the earth pipe (+, 1, . . . ) and the inner wall surface (12) of the vertical hole is shown.

〔Effect of the invention〕

According to the present invention, when connecting a plurality of edible conductive earth pipes of a predetermined length to form a ground electrode, as the earth pipe,
A connecting beam for connecting an earth pipe is crimped and fixed to a crimping fixing part at one end, and a crimping part is provided at the other end for fitting and crimping a connecting beam for connecting an earth pipe that is crimped and fixed to another earth pipe. It is characterized by the use of a structure consisting of:

Therefore, when connecting the earth pipes of the present invention, the connecting beam for connecting the earth pipes of another earth pipe is fitted into the crimping part of the rear end of the preceding earth pipe, and the crimping part is crimped using a hydraulic crimping machine or the like. However, since the connection can be made reliably, the connection work is efficient and stable grounding characteristics can be ensured over a long period of time. Furthermore, since the connection means is a simple method of crimping, it is more economical than conventional screw connections.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the structure of the earth pipe of the present invention. FIG. 2 is a front view showing the structure of a lead wire fixing terminal fixed to the end of the earth pipe. 3 to 5 are explanatory diagrams of a construction method for using the earth pipe of the present invention as an earth power source.
FIG. 5 is a diagram illustrating the process of inserting the connected earth pipe into the excavation pipe and injecting the reducing agent. FIG. 5 is a diagram illustrating the completed state of construction. l...Earth pipe 2...Crimp fixing part 3...Crimp part 4...Connection protrusion for connecting earth pipe 5...Lead wire fixed terminal 4'...Connection for lead wire fixed terminal 6. Rido line patent applicant Tsuguhiko Watanabe

Claims (1)

[Claims] 1. In the structure of an earth electrode earth pipe in which a plurality of good conductive earth pipes (1) of a predetermined length are connected and a ground lead wire is fixed to the end of the last earth pipe, the predetermined length is Good conductive earth pipe (1)
The connecting protrusion (4) for connecting the earth pipe is crimped and fixed to the crimping fixing part (2) at one end, and the connecting protrusion (4) for connecting the earth pipe, which is crimped and fixed to the other earth pipe, is fitted to the other end. A structure of an earth pipe for an earth electrode, characterized in that it is provided with a crimping part (3) for crimping.