KR100556289B1 - A Ground Electrode Integrated Electric Pole and A Process for Producing the Same - Google Patents

Abstract

The present invention relates to a ground electrode-integrated pole and a method for manufacturing the same, characterized in that the upper end of the general concrete and the lower end of the conductive concrete and the grounding electrode is embedded in the lower end of the conductive concrete. Conductive concrete is 50 ~ 70% of Portland Class 1 cement suitable for KS standard, 20 ~ 40% of calcium carbonate (95% of CaCO ₃ , below 4㎛ average particle size), 5 ~ 10% of fine aggregate, carbon fiber (tensile strength of 360kgf / mm) Conductive cement formed by mixing ² or more, resistivity 1.1 × 10 ^-3 Ωm or less) 0.1 ~ 3%, soda ash (99% or more of Na ₂ CO ₃ ) 0.1 ~ 3%, high performance water reducing agent (resistance 15% or more) 0.1 ~ 3% It includes. The ground electrode integrated pole of the present invention is excellent in the cost saving effect and the earth leakage blocking effect.

Grounding Electrode, Integral Pole, Conductive Concrete

Description

Grounding electrode integrated pole and manufacturing method thereof {A Ground Electrode Integrated Electric Pole and A Process for Producing the Same}             

1 is a manufacturing process diagram of a typical general pole.

2 is a manufacturing process diagram of a ground electrode integrated pole according to the present invention.

3 is a configuration diagram showing a state in which the ground electrode integrated pole according to the present invention is embedded.

4 is a cross-sectional view taken along the line A-A of FIG.

<Description of the symbols for the main parts of the drawings>

2: pole 4: upper section

6: bottom 8: bare wire

10: ground wire 12: ground wire inlet

14: iron wire

The present invention relates to a ground electrode integrated pole. More specifically, the present invention relates to a ground electrode-integrated pole and a method for manufacturing the same, characterized in that it is composed of the upper end of the general concrete and the lower end of the conductive concrete and the ground electrode is embedded in the conductive concrete at the lower end.

Jeonju is a public facility that supplies electricity without wasting electric current by pulling the wire with moderate strength. Currently, in the urban area, it is common to bury wires in the ground, but the laying of wires underground is not only costly and time-consuming, but also in advanced countries because of the high maintenance costs when power is cut off or roads are extended. I use a lot of poles. In particular, many domestic poles are expected to be buried in the future due to the fact that there are many areas where the mountainous terrain cannot be buried underground due to the domestic terrain.

Currently, Jeonju's existing construction method drills the ground with a drill, inserts the pole, and performs grounding at the bottom of the pole. This is a costly and time-consuming process for grounding. Therefore, there is a need to reduce the cost and time for grounding work. Korean Patent Laid-Open Publication No. 2000-0074099 describes a method for forming a concrete pole and a grounding electrode inside and outside a ground electrode. In more detail, a predetermined shape grounding electrode is embedded in the lower portion of the pole that is buried to a certain depth in the ground, where the small shape grounding electrode combines a circular grounding ring and a needle grounding electrode attached to the lower portion at a predetermined interval. A plurality of unit ground electrodes are arranged in the longitudinal direction and consist of a ground electrode support connecting each unit ground electrode. The needle ground electrode is formed of a stainless material, not copper, to prevent corrosion due to discharge. However, the present invention involves a cumbersome process of manufacturing a specific type of ground electrode and inserting it into the pole.

Still, there is a need for new poles that are easy to manufacture while reducing the cost and time required for grounding work.

The inventors of the present invention winding the wire pole inside the electric pole in the part (bottom end) buried in the ground with a bare copper wire from the ground guide wire to the upper end and the conductive concrete is added to manufacture the electric pole, the construction using the manufactured electric pole It was found that even if the separate grounding work was omitted, the earth leakage protection effect was excellent.

Accordingly, in one aspect, the present invention provides a grounding electrode integrated pole characterized by consisting of the upper end of the general concrete and the lower end of the conductive concrete and the grounding electrode is embedded in the lower end of the conductive concrete.

In another aspect, the present invention is (a) to make a pole cast from steel wire, PC steel bar and PVC accessories,

(b) mixing water, cement, fine aggregate, coarse aggregate, high strength mixture and admixture to form a general concrete mixture,

(c) mixing water, conductive cement and high strength mixture to form a conductive concrete mixture,                         

(d) placing the pole mold made in step (a) on the electric pole mold;

(e) inserting the general concrete mixture prepared in step (b) into the upper part of the mold and then inserting the conductive concrete mixture prepared in step (c) into the lower part of the mold, which is the part embedded in the ground, or Insert the conductive concrete mixture prepared in step (c) at the lower end of the mold, which is part, and then insert the general concrete mixture prepared in step (b) at the upper end of the mold, or at step (b) at the upper end of the mold. At the same time inserting the general concrete mixture and inserting the conductive concrete mixture prepared in step (c) at the lower end of the mold, which is the part embedded in the ground,

(f) the molds are assembled and centrifuged;

(g) steam curing the molded mold,

(h) demolding to obtain a ground electrode-integrated pole, which provides a method of manufacturing a ground electrode-integrated pole.

Typically, the pole has a total length of about 8m to 18m and about 1.4 to 2.5m of the total length is buried underground. Concrete used in conventional poles is generally made of a mixture of cement, fine aggregate, coarse aggregate, admixture and water. The ground electrode integrated pole according to the present invention is composed of an upper end and a lower end. That is, the upper end of the ground electrode integrated pole of the present invention is formed of ordinary concrete, as in the conventional pole, while the lower end is embedded in the ground, unlike the upper end, conductive cement, high-strength mixture and water and optionally coarse aggregate, fine aggregate and admixture Characterized in that formed of conductive concrete consisting of.

The lower end of the pole according to the present invention serves as a grounding electrode and is made of conductive concrete. The conductive concrete used in the present invention is characterized by consisting of 70% by weight to 80% by weight of conductive cement, 0 to 10% by weight and 100% by weight of the high-strength mixture.

The general concrete of the upper part is generally used for poles, and generally 10 to 30% by weight of cement, 20 to 40% by weight of aggregate, 30 to 50% by weight of aggregate, 0 to 1% by weight of admixture, high strength mixture It is made by mixing 0-30% by weight and 0-20% by weight of water.

The cement used for the upper end of the pole according to the present invention may be any commercially available cement, and examples thereof include Portland type cement suitable for KS standards.

Cement used in the lower end of the pole according to the present invention is a conductive cement composed of a characteristic component and composition is a product using a mixture of cement and a conductive material and a product using an inorganic compound. In one embodiment of the present invention, the conductive cement is Portland type cement 50-70%, calcium carbonate (CaCO ₃ 95% or more, average particle diameter 4㎛ or less) 20-40%, fine aggregate 5-10%, carbon Fiber (tensile strength 360kgf / mm ² or more, resistivity 1.1 × 10 ^-3 Ωm or less) 0.1 ~ 3%, soda ash (Na ₂ CO ₃ 99% or more) 0.1 ~ 3%, high performance water reducing agent (resistance rate 15% or more) 0.1 ~ 3 It is formed by mixing%.

The fine aggregate used in the present invention is made of sand or sand powder having the same specifications as that of sand, and does not contain other harmful substances such as organic matters, and has an appropriate particle size distribution passing through about 5 mm sieve.

The coarse aggregate used in the present invention is defined as aggregate that takes more than 85% by weight in a 5 mm sieve, and preferably, mainly crushed gravel (crushed stone) and river gravel are used, and aggregates remaining more than 85% in a 5 mm sieve are used.

The admixture used in the present invention is a high performance sensitizer mainly composed of naphthalene sulfonic acid formalin condensate, which has excellent fluidity at low water / cement ratio and is used for producing high strength concrete.

The high-strength mixture used in the present invention is formed by pulverizing anhydrous gypsum and cement and is usually used in the production of high-strength concrete products by steam curing.

The ground electrode integrated pole according to the present invention can be manufactured according to the process as shown in FIG. This will be described with reference to the accompanying drawings.

Steel pole, PC steel rod and PVC accessories are assembled and manufactured. 3 and 4, the lower end 6 serving as the ground electrode of the pole 2 is wound 3 to 10 times with a bare wire 8 before the conductive concrete is put into the pole inner iron wire 14, where the ground guide wire Pull out the ground wire 10 from the upper end (4) to the outside. Water, cement, fine aggregate, coarse aggregate, high strength mixture and admixture are mixed in the mixer for 60 seconds to form general concrete for the upper end of the pole in accordance with the present invention. Separately, water, conductive cement and a high strength mixture are mixed in the mixer for 60 seconds to form conductive concrete for the lower end of the pole in accordance with the present invention. Subsequently, the assembled electric pole mold is placed on a mold of, for example, the Korea Electric Power Pole 16m type. The formed concrete is evenly inserted between the molds 2-16m and the formed conductive concrete is evenly inserted between the molds 0-2m. Of course, the conductive concrete can be inserted first, and the conductive concrete and the ordinary concrete can be inserted at the same time. The mold is then assembled and centrifuged while rotating in a centrifugal molding machine. Molding conditions are shown in Table 1 below.

Table 1.

Contents Gravity Acceleration (m / sec ² ) Retention time (minutes) sleaze 1-5 1-10 Medium speed 5-10 1-10 Middle and high speed 10-20 1-10 high speed 20-40 1-10

Preferably, it is molded at a low speed of 154 rpm 4 minutes, a medium speed 244 rpm 2 minutes, a medium speed 423 rpm 2 minutes, and a high speed 646 rpm 4 minutes. Next, the molded mold is transferred to a curing chamber for steam curing. Curing conditions are as described in Table 2 below.

Table 2.

step Contents Temperature Retention time (hours) One transposition Room temperature 1-20 2 Elevated temperature 5-20 ℃ / hour 1-20 3 maintain 50-100 ℃ 1-5 4 Slow cooling Room temperature 5-24

Preferably, after heating up to 80 ° C. for 4 hours at 15 ° C./hr for 3 hours at room temperature (20 ° C.), the power is turned off and slowly cooled for 15 hours. Thereafter, demolding was performed to obtain a ground electrode integrated pole according to the present invention.

The ground electrode integrated pole according to the present invention is formed by the lower end of the ground electrode and the upper end of the concrete so that the upper end serves as a general pole and the lower end serves as a ground electrode. Jeonju-ro according to the present invention, even if omitted the ground construction at the time of construction of the Jeonju because it shows a superior effect than the ground construction has the effect of reducing the construction cost and more powerful short circuit in the electric pole.

The invention will be more specifically illustrated by the following examples. However, these examples are merely embodiments of the present invention and do not limit the scope of the present invention.

<Example>

Jeonju according to the present invention was prepared as follows.

(1) conductive cement manufacturing

Portland Class 1 cement 50 ~ 70%, calcium carbonate (CaCO ₃ 95% or more, average particle size 4㎛ or less) 20 ~ 40%, fine aggregate 5 ~ 10%, carbon fiber (tensile strength 360kgf / mm ² or more) Resistivity 1.1 × 10 ^-3 Ωm or less) 0.1 to 3%, soda ash (Na ₂ CO ₃ 99% or more) 0.1 ~ 3% and high performance water reducing agent (resistance 15% or more) 0.1 to 3% was mixed to form a conductive cement.

(2) Manufacture of pole pole integrated with ground electrode

Jeonju molds were assembled by steel wire, PC steel bar and PVC accessories. 97.2kg of water, 392kg of cement (one kind of cement), 521kg of fine aggregate (crushed sand), 757kg of coarse aggregate, 40kg of high strength mixture (Dongyang Major Σ1000), 5.88kg of admixture (Ezicon, Powercon) in the mixer for 60 seconds Bouillon general concrete was formed. 35.2 kg of water, 158.8 kg of the prepared conductive cement, and 17.6 kg of a high-strength mixture (Dongyang Major Σ1000) were mixed in the mixer for 60 seconds to form conductive concrete for the lower portion. We put the Jeonju mold made before the 16m mold of KEPCO. The pre-made general concrete is evenly inserted between the molds 2 to 16m, and then the conductive concrete made beforehand is evenly inserted between the molds 0 to 2m and then assembled the molds. The mold was centrifuged at a low speed 154 rpm 4 minutes, medium speed 244 rpm 2 minutes, medium speed 423 rpm 2 minutes and high speed 646 rpm 4 minutes in a centrifugal molding machine. The molded mold was transferred to a curing room at room temperature (20 ° C.) for 3 hours, and heated to 80 ° C. for 4 hours at 15 ° C./hr. Then, the power was turned off and slowly cooled for 15 hours to perform steam curing, followed by demolding. A ground electrode integrated pole was obtained.

From the above description, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. In this regard, it should be understood that the embodiments and experimental examples described above are illustrative in all respects and not restrictive. The scope of the present invention should be construed that all changes or modifications derived from the meaning and scope of the appended claims and their equivalents, rather than the detailed description, are included in the scope of the present invention.

The ground electrode integrated pole of the present invention is excellent in the cost saving effect and the earth leakage blocking effect.

Claims (6)

In the ground electrode integrated pole consisting of the upper end of the ordinary concrete and the lower end of the conductive concrete, The lower portion of the conductive concrete is Portland Class 1 cement 50 ~ 70%, calcium carbonate (CaCO ₃ 95% or more, average particle diameter 4㎛ or less) 20 ~ 40%, fine aggregate 5 ~ 10%, carbon fiber (tensile strength 360kgf / mm ² or more, the resistivity 1.1 × 10 ^-3 Ωm or less) of 0.1 to 3%, soda ash (Na ₂ CO ₃ 99% or more) of 0.1 to 3% and superplasticizer (Water reduction rate of 15% or more) 0.1 to 3% by conductive cement 70 parts by weight mixture of A ground electrode integrated pole comprising% to 80% by weight, a high-strength mixture of 0 to 10% by weight and 100% by weight of adjusted amount of water and a ground electrode embedded in the conductive concrete at the bottom. delete delete (a) make pole castings from steel wires, PC steel bars and PVC accessories; (b) water, cement, fine aggregate, coarse aggregate, high strength mixture and admixture to form a concrete mixture, (c) Portland Class 1 cement 50-70%, calcium carbonate (CaCO ₃ 95% or more, average particle size 4㎛ or less) 20-40%, fine aggregate 5-10%, carbon fiber (tensile strength 360kgf / mm ² or more, resistivity) 1.1 × 10 ^-3 Ωm or less) 0.1 to 3%, soda ash (99% Na ₂ CO ₃ or more) 0.1 to 3% and high performance water reducing agent (resistance rate 15% or more) Mixing by weight of 0% to 10% by weight and 100% by weight adjusted amount of water to form a conductive concrete mixture, (d) placing the pole mold made in step (a) on the electric pole mold, (e) inserting the general concrete mixture prepared in step (b) into the upper part of the mold and then inserting the conductive concrete mixture prepared in step (c) into the lower part of the mold, which is the part embedded in the ground, or Insert the conductive concrete mixture prepared in step (c) at the lower end of the mold, which is part, and then insert the general concrete mixture prepared in step (b) at the upper end of the mold, or at step (b) at the upper end of the mold. At the same time inserting the general concrete mixture and inserting the conductive concrete mixture prepared in step (c) at the lower end of the mold, which is the part embedded in the ground, (f) the molds are assembled and centrifuged; (g) steam curing the molded mold, (h) demolding to obtain a ground electrode integrated pole; delete delete

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