JP4520735B2 - Method for constructing underwater grounding electrode and underwater grounding device having the underwater grounding electrode - Google Patents

Description

The present invention relates to an underwater grounding electrode for protecting a grounded body such as a building or an electrical device such as equipment from a high-voltage surge or the like, and a construction method of an underwater grounding device having the underwater grounding electrode. .

Grounding is necessary to protect grounded objects such as equipment such as buildings and electrical equipment from surges such as lightning, but there are many rocks and hard soils especially on the coast. It may be extremely difficult to perform the grounding work on the grounded object installed on the ground as well as the danger. In such a case, an underwater grounding device having such an underwater grounding electrode is used by arranging a copper plate or a grounding rod as an underwater grounding electrode on the seabed. Also, for floating signs (route signs, lighthouses, etc.) as grounded objects installed on the sea, etc., use underwater grounding devices such as floating signs using copper plates and grounding rods installed on the seabed. It was composed.
JP-A-5-182701

However, when an underwater grounding device is constructed as a grounding device for the grounded body, there is a favorable condition that the specific resistance of the underwater soil is low, but on the other hand, it is necessary to take special measures against water damage, salt damage, etc. In a short period exceeding the expectation, there was a problem that the corrosion of the underwater grounding device progressed and the function as the grounding device was lost.

In addition, it is necessary to take anti-corrosion and waterproof measures at the connection conductor that connects the underwater grounding electrode to the grounded body and at the connection point between the grounded body and the connecting conductor. In addition, there was a problem that advanced skills were required.

The objective of this invention is solving the subject which the construction method of the conventional underwater grounding electrode mentioned above and the underwater grounding apparatus which has this underwater grounding electrode has.

In order to achieve the above-described object, the present invention provides a metal skeleton member made of a material having excellent corrosion resistance, which includes a pair of parallel portions and a connecting portion that connects the pair of parallel portions, and the metal skeleton. A conductive concrete member in which the member is embedded, and a block member composed of an external metal member formed of a material having excellent corrosion resistance attached to the surface of the concrete member, and the metal skeleton member includes A connection conductor extending outward beyond the block member is connected to the connection conductor, and a protective body is attached to the connection conductor, and the connection conductor is connected to the connection conductor located in water. The conductor and the connecting conductor coming out of the water surface are inserted into the protective tube .

Further, in order to achieve the above object, a pair of parallel portions and said pair of metal frame member is formed of a material excellent in corrosion resistance comprising a connecting portion for connecting the parallel portions, the metallic conductive concrete member embedding the skeleton member, the block member made of an external metal member formed of a material excellent in corrosion resistance which is attached to the surface of the concrete element, and are connected to the metal frame member the connection conductor protector is attached with, embedded in the hole which is Kezuho the sea bed, then, the connecting conductors located in the water, along with connecting the connecting conductors of the appropriate number, to the connecting conductor, the protective tube was inserted, then the top of the coupling conductor coming out of the water, but which is adapted to connect the ground line.

Since this invention has the structure mentioned above, there can exist the effect described below.

Since the underwater grounding electrode is composed of a block member with excellent corrosion resistance, it is possible to use a favorable condition that the specific resistance of the underwater soil is small, and to obtain an underwater grounding device with excellent corrosion resistance. The life of the ground electrode can be extended, and as a result, an underwater ground electrode with low running cost can be provided.

A hole is excavated in the bottom of the water, and then a block member with excellent corrosion resistance that constitutes an underwater grounding electrode is embedded in the hole, and then a connection conductor connected to the block member and a connection connected to the connection conductor By connecting a grounding wire to the connecting conductor via a conductor, an underwater grounding device with an underwater grounding pole was constructed, so it was possible to use the favorable condition that the specific resistance of the underwater soil was small, and it was rich in corrosion resistance. The underwater grounding device can be easily and inexpensively installed.

In addition, an underwater grounding device having a long life with excellent corrosion resistance and a low grounding resistance can be constructed at an inexpensive running cost.

Hereinafter, examples of the present invention will be described. However, the present invention is not limited to these examples as long as the gist of the present invention is not exceeded.

P1 is a block member, and the block member P1 includes a metal skeleton member P1a, a concrete member P1b in which the metal skeleton member P1a is embedded, and an external metal member P1c attached to the surface of the concrete member P1b. Has been. The metal skeleton member P1a and the external metal member P1c are formed of a material excellent in corrosion resistance against water, salt water, and the like such as titanium material (including titanium alloy) and stainless steel material.

The metal frame member P1a constituting the block member P1 includes a pair of rod-like or plate-like parallel portions p 1 and p 2 arranged in parallel and the pair of parallel portions p 1 and p 2 at a substantially central portion thereof. The rod-shaped or plate-shaped coupling portion p3 to be coupled is formed in a substantially square shape.

After placing the substantially E-shaped metal skeleton member P1a in the box-shaped formwork, the ready-mixed concrete is poured into the box-shaped formwork, and after the ready-mixed concrete is solidified, it is solidified from the box-shaped formwork. By taking out the ready-mixed concrete, the concrete member P1b in which the metal skeleton member P1a is embedded can be formed. Excellent corrosion resistance against water, salt water, etc. of titanium material (including titanium alloy) and stainless steel on the upper and lower surfaces and left and right side surfaces of the concrete member P1b in which the metal framework member P1a formed in this way is embedded The block member P1 is configured by attaching an external metal member P1c made of a plate material.

A plurality of hooks P2 are attached to the upper plate member p4 of the external metal member P1c constituting the block member P1. In addition, a rod-like or plate-like connecting conductor P3 extending to the outside beyond the block member P1 is connected to the metal skeleton member P1a, and further, to the connecting conductor P3 located in the concrete member P1b, A protector P4 is attached. The connection conductor P3 is also formed of a material excellent in corrosion resistance against water, salt water, or the like such as titanium material (including titanium alloy) or stainless steel material.

As described above, the underwater grounding electrode P is configured by the block member P1, the hook P2, the connection conductor P3, and the protection body P4.

In addition, it is preferable to add conductive powder such as carbon black or metal powder to the above-described ready-mixed concrete so that the concrete member P1b constituting the block member P1 becomes the conductive concrete member P1b.

By connecting the bar or plate constituting the connection conductor P3 with an appropriate connection tool such as a screw, bolt, or nut, the connection conductor P3 is made to have a desired length, and titanium or The problem of titanium alloys can be solved. Further, by laminating the plate materials constituting the connection conductor P3, it is possible to increase the thickness of the connection conductor P3 and realize a large current capacity of the connection conductor P3.

An underwater grounding apparatus A using the underwater grounding pole P having the above-described configuration will be described with reference to FIG.

A hole 2 is excavated in the soil of the bottom 1 such as the sea or a lake, and the block member P1 of the above-described underwater grounding electrode P is embedded in the hole 2. At this time, the entire block member P <b> 1 can be embedded in the hole 2, or a part of the block member P <b> 1 can be embedded in the hole 2.

Next, another rod-like or plate-like connecting conductor 3 is connected to the connecting conductor P3 connected to the metal frame member P1a. The connecting conductor 3 is also formed of a material having excellent corrosion resistance against water, salt water, and the like such as titanium material (including titanium alloy) and stainless steel material. Holes 3a are formed at both ends of the connecting conductor 3, and a titanium material (including a titanium alloy) or a stainless material is provided in the hole 3a formed at one end of the connecting conductor 3 and the hole p5 formed in the connecting conductor P3. A bolt formed of a material excellent in corrosion resistance with respect to water such as water or salt water is inserted, and a nut is screwed into the bolt to connect the connecting conductor 3 to the connecting conductor P3 and to connect the connecting conductor P3. In the same manner, another connecting conductor 3 is connected to the connecting conductor 3 connected to, using bolts and nuts, so that the connecting conductor 3 positioned at the upper end is exposed from the water surface H. The connection between the connection conductor P3 and the connection conductor 3 and the connection between the connection conductors 3 are not limited to connection means for inserting bolts into the holes 3a and p5 and screwing the nuts into the bolts, such as tightening bands and welding. Various known connection means can be employed.

In addition, a protective tube 4 made of a hard PVC pipe or the like is inserted into the predetermined connecting conductor 3 located in the water and the connecting conductor 3 protruding from the water surface H, and the protective tube 4 is positioned in the water by the attachment member 5. The underwater grounding device A is constructed by attaching the grounding wire 6 to the uppermost connecting conductor 3 and attaching the grounding wire 6 to the quay or rocky shore G1 or the quayside or rocky ground G2 coming out of the water. The underwater grounding device A is connected to a grounded body (not shown) via the grounding wire 6. Further, the underwater grounding device A can be constructed by attaching the connecting conductor 3 coming out of the water surface H to a floating sign (route sign, lighthouse, etc.) or the like by the attachment member 5.

As described above, the connecting conductor 3 is also formed of a material excellent in corrosion resistance against water or salt water such as titanium material (including titanium alloy) or stainless steel, but is exposed from the water surface H. The part of the connecting conductor 3 can be made of a material having poor corrosion resistance.

As described above, the hole 2 is excavated in the bottom 1 of the sea or lake, and the hole 2 is formed of the block member P1, the hook P2, the connection conductor P3, and the protective body P4, and has excellent corrosion resistance. Since the underwater grounding electrode P is buried, it is possible to use a favorable condition that the specific resistance of the underwater soil is small, and it is possible to construct the underwater grounding device A rich in corrosion resistance easily and inexpensively.

In addition, the underwater grounding device A having a long life with excellent corrosion resistance and a low grounding resistance can be constructed at an inexpensive running cost.

Furthermore, generally, titanium material or its alloy material, which is more expensive and difficult to process than copper material, is formed into an appropriately sized tube or plate, and an appropriate fixing tool such as a screw or bolt. Therefore, the underwater grounding electrode P and the underwater grounding device A can be manufactured at low cost.

In the above-described embodiment, the upper and lower surfaces and the left and right side surfaces of the concrete member P1b in which the metal skeleton member P1a is embedded have corrosion resistance against water or salt water such as titanium material (including titanium alloy) or stainless steel material. Although an example in which the block member P1 is configured by attaching an external metal member P1c made of an excellent plate material is shown, the external metal member P1c is formed in a box shape with the top open, and formed into a box shape After placing the metal skeleton member P1a, the connecting conductor P3, the protector P4, etc. in the external metal member P1c, the ready-mixed concrete is poured into the box-shaped external metal member P1c, and the ready-mixed concrete is cured. Thereafter, the upper open portion is covered with an upper plate material p4 made of a plate material excellent in corrosion resistance, whereby the external metal member P1c can be configured. In such an embodiment, substantially the entire surface of the concrete member P1b is covered with an external metal member P1c made of a plate material having excellent corrosion resistance against water, salt water, etc., such as titanium material (including titanium alloy) and stainless steel material. It will be.

FIG. 1 is a front view of the underwater grounding electrode of the present invention. FIG. 2 is a side view of the underwater grounding electrode of the present invention. FIG. 3 shows an underwater grounding device using the underwater grounding electrode of the present invention.

Explanation of symbols

A ... Underwater grounding device P ... Underwater grounding electrode P1 ... Block member P1a ... ... Metallic framework P1b ... Concrete member P1c ... External metal member P2 ... Hook P3 ... ······· Connection conductor P4 ·······················… ········ Connecting conductor 4 ······································································・ Grounding wire

Claims (2)

A metal skeleton member formed of a material having excellent corrosion resistance, which includes a pair of parallel portions and a connecting portion that connects the pair of parallel portions, a conductive concrete member in which the metal skeleton member is embedded, and the concrete member A connection member extending to the outside beyond the block member, the block member comprising an external metal member formed of a material having excellent corrosion resistance and attached to the surface of the metal frame member. A conductor is connected , a protective body is attached to the connection conductor, and a connection conductor connected to the connection conductor located in water and a connection conductor coming out of the water surface are connected to the protective tube. An underwater grounding electrode characterized by being inserted . A pair of metallic frame member is formed of a material excellent in corrosion resistance comprising a connecting portion for connecting the parallel portions and said pair of parallel portions, the conductive concrete member for embedding the metal frame member, the surface of the concrete member A block member made of an external metal member formed of a material with excellent corrosion resistance attached to the surface , and a connecting conductor connected to the metal skeleton member and attached with a protective body, is excavated in the bottom of the water. embedded in by holes, then the connection conductor positioned in the water, along with connecting the connecting conductors of the appropriate number, to the connecting conductor, inserted through the protective tube, then connecting the top coming out of water the conductor, the construction method of water grounding device having a water ground electrode, characterized in that so as to connect the ground line.

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