JPH0256432B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" This invention relates to a poorly soluble current-carrying electrode for an external power supply device.

``Conventional technology'' To install a poorly soluble current-carrying electrode in an external power supply device, a vertical hole is dug from the ground surface, and the poorly soluble current-carrying electrode is suspended in the hole via a lead wire, and then the hole is backfilled with backfill. Electrode installation is complete.
For example, when explaining the method of digging by hand,
As shown in Figures 3a to 3f, first, the worker 1 performs preliminary digging 2 for positioning (Figure a), and then excavates to a predetermined depth with the hand auger 3 (Figures b, c, and d).
Figure) After the hole wall collapses, the fallen earth such as 4 is pulled up and the hole is prepared as residual soil 5 (Figure e), the electrode 7 is suspended at a predetermined level via the lead wire 6, and the back fill 8 is filled ( f figure). However, with this method, a pit must first be dug to a predetermined depth where the current-carrying electrode will be installed;
It is often impossible to fill the back file.
Currently, a steel casing is inserted as a measure to prevent this collapse, but this requires the use of an auger truck or a boring machine, and small-scale external power equipment (current capacity 1A
Even when digging a shallow hole of several meters for the electrode used in the electrodes (approximately 2A), an auger truck 9 equipped with a boring machine as shown in Fig. 4 is used to make a large diameter hole 10 without the risk of collapse. Dig the electrode 7
The reality is that we are currently installing

``Problems to be Solved by the Invention'' However, the above-mentioned methods are limited by the environment and site for boring work, and recently there are few places where auger trucks can be brought in to carry out construction, and it is difficult to carry out boring work in narrow areas. We are struggling with road corrosion protection.
As a result, it is now almost impossible to hire them.

``Means for Solving the Problems'' and ``Operations'' The present invention has been made in view of the above circumstances, and its gist is to provide a spiral-equipped tubular hand auger with a built-in structure that is placed in the soil. As a tube with a built-in electrode, a refractory electrode is buried inside the tube and a backfill is filled, so that the tube can be simply excavated without any environmental or site constraints, and without worrying about the collapse of the excavation hole. The point is that the electrodes can be installed only by

"Example" This will be explained in detail below based on the drawings.

FIG. 1 is a front view of the electrode of the present invention, and FIG. 2 is an explanatory diagram of the installation work of the electrode of the present invention. In FIG. 1, reference numeral 11 is a tubular hand auger with a spiral, and a soil crushing claw 14 is provided at the conical end portion 13 of the hand auger.

In the present invention, this auger 11 is made into a tube with a built-in electrode, and the tube is filled with a back-fil 15 (a low-resistivity filler mainly composed of graphite particles), and the back-fil 15 contains a hardly soluble electrode 16.
is buried.

In the figure, 17 is a termination device at the tip of the electrode 16, and 18 is a terminal device at the tip of the electrode 16.
is a lead wire connection portion at the base end of the electrode 16, and 19 is a lead wire.

The auger 11 is connected to an auger joint pipe 21 via a joint 20, and in the present invention, the auger 11 is assembled so that it can remain in the soil.

It goes without saying that the lead wire 19 runs inside the joint pipe 21.

Thus, the electrode of the present invention having the above-mentioned configuration is installed in accordance with the following procedure.

1 Perform test drilling.

2. Set the auger 11 with a built-in electrode in the test hole, and while connecting the joint pipes 21, etc., rotate it and dig up and down. (Figure 2) 3. When the predetermined electrode installation depth is reached, excavation is stopped and electrode installation is completed.

4. In the subsequent construction, the lead wire 19 from the electrode is connected to the pole of the external power supply device in the same way as in the conventional electrode device.

During this time, unlike the conventional means which is based on the assumption that the holes do not collapse, the collapse of the holes is unrelated to the electrode installation. Further, a comparison between the conventional hand auger shown in FIG. 3 described above and the present invention in terms of soil environment and electrode installation method is as follows. In other words, in the case of soft strata (sludge, sand, water), the soil within the excavation hole would collapse, so the hole could not be dug. (However, excavation is possible if a guide tube is used.) In contrast, in the present invention, the tip of the bare tube containing the electrode is spiral, making it easy to dig. Maximum depth is 5m or more.

In the case of hard strata (sand, silt, gravel), conventionally it is difficult to scrape the soil due to the structure of the auger.

With gravel, sand, etc., the holes will collapse and no holes will be formed. Maximum depth 3m>.

In contrast, in the present invention, the tip is spiral, so it is possible to dig by twisting it up and down while rotating it.

Maximum depth: 3m or more.

Conventionally, in the case of clay, it was possible to dig a hole, but as the hole got deeper, the clay adhered to the auger, making it difficult to pull the soil out.

Maximum depth 5m>.

In contrast, in the present invention, it is easy to dig.

Maximum depth: 5m or more.

In the case of uneven geological strata (clay, red soil, gravel), it has traditionally been difficult to secure areas with different soil types as collapse holes.

Maximum depth 3m>.

In contrast, in the present invention, it is easy to dig.

Maximum depth: 3m or more.

Regarding the electrode installation method, the conventional method is to set the electrode in the hole and fill it with backfill before the hole collapses, but since it is difficult to check the condition of the hole from the ground surface, it is difficult to ensure the electrode installation condition. Enough is enough. In contrast, in the present invention, since the electrode itself is set within the auger, the installation of the electrode can be completed at the same time as digging to a predetermined depth. Since the electrodes can be set within the protective tube, the placement of the electrodes can be maintained uniformly. Furthermore, conventionally, 30cmφ×5m≒0.4m ³
Therefore, it is necessary to dispose of the remaining soil.

Six steps are required from test drilling to electrode installation.

In contrast, in the present invention, almost no residual soil is produced.
Since the work from test drilling to electrode installation can be done in three steps, the work can be significantly simplified compared to the old method.

"Effects of the Invention" The various effects of the present invention as described above are listed below.

There is no need to dig a hole to install a current-carrying electrode.

Current-carrying electrodes can be installed just by digging.

A narrow site (2 m) where large excavators cannot be used.
x3m) construction is possible.

There is almost no leftover soil.

Suitable for soft soils that are prone to crumbling.

Shorter construction period.

Reduction of construction costs.

[Brief explanation of drawings]

Fig. 1 is a front view of the electrode of the present invention, Fig. 2 is an explanatory diagram of the installation work of the electrode of the present invention, Fig. 3 a to f is an explanatory diagram of the procedure of the conventional hand auger method, and Fig. 4 is a work using an auger car. It is an explanatory diagram. 1... Worker, 2... Pre-digging, 3... Hand auger, 4... Fallen earth, 5... Remaining soil, 6... Lead wire, 7... Electrode, 8... Back fill, 9... Auger car, 10...
Large diameter hole, 11...auger, 13...tip cone,
14... Soil crushing claw, 15... Back file, 16
... Slightly soluble electrode, 17... Terminal device, 18... Lead wire connection section, 19... Lead wire, 20... Joint, 21... Joint pipe.

Claims (1)

[Claims] 1. A sparingly soluble energizing electrode for an external power supply device, in which a spiral-equipped tubular hand auger with an assembled structure that is placed in the soil is filled with a backfill while a sparsely soluble electrode is buried in the tube as an electrode built-in tube.