JP6325761B1 - ELECTRODE STRUCTURE INSTALLATION UNIT AND CONNECTOR AND ELECTRO-COROSURE PROTECTION METHOD FOR UNDERGROUND METAL - Google Patents

Abstract

An electrode structure installation unit capable of performing an installation operation in a short time easily and at low cost when an electrode structure for supplying a corrosion-proof current to an underground metal body is installed in the ground. To provide an anti-corrosion construction method for underground metal bodies using these connectors and these. An electrode structure installation unit 1 of the present invention is detachably connected to an electrode structure 2 having a long shape in one direction and one end in a longitudinal direction X of the electrode structure 2 via a connector 3. The excavator propulsion device 4 is configured to rotate the electrode structure 2 around the axial direction. The electrode structure 2 is operated by operating the excavation propulsion unit 4 with the other end in the longitudinal direction X of the electrode structure 2 in contact with the ground 100S and holding the grip portion 42 provided on the excavation propulsion unit 4 with fingers. The electrode structure 2 can be excavated and propelled into the ground by rotating in the axial direction. [Selection] Figure 3

Description

  TECHNICAL FIELD The present invention relates to an electrode structure installation unit and a connector for electrically preventing corrosion of underground metal bodies such as buried pipes, steel pipe piles, underground tanks, and the like, and an anticorrosion construction method for underground metal bodies using these.

  It is known that underground metal bodies penetrating valve chambers, joint grooves, aqueducts and other reinforced concrete structures will corrode when they come into contact with the reinforcing bars that are in contact with the reinforced concrete structures. Is called concrete / soil macrocell corrosion (C / S macrocell corrosion). In addition, when the underground metal body is arranged across a plurality of types of soils having different air permeability, or is in contact with soil with low air permeability, the part in contact with the low air permeability soil in the underground metal body However, corrosion may occur in the underground metal body as an anode portion, and such corrosion is referred to as air flow difference macrocell corrosion.

  In order to prevent C / S macrocell corrosion and air flow difference macrocell corrosion, an anticorrosion method using an external power supply method has been conventionally used. This cathodic protection method uses a DC power supply device installed on the ground to prevent a DC current from flowing from an external power supply electrode installed in the ground into the underground metal body that is the object to be protected. Is the method. As a method for installing an external power supply electrode, a shallow buried electrode method in which an external power supply electrode is installed at a relatively shallow position from the ground surface, for example, within a range of several meters below the ground surface is known. . The shallow buried electrode method is generally applied to corrosion prevention in a local place such as prevention of C / S macro cell corrosion and air flow difference macro cell corrosion, and prevention of electrocorrosion of a relatively small scale corrosion-protected body. .

  Conventionally, in the shallow buried electrode method, an electrode installation hole is formed by excavating the ground using a boring machine such as a drilling shaft, and an electrode for an external power source is embedded in the electrode installation hole. However, in preparation for excavation work using a digging pillar car, it is necessary to prepare troublesome work such as overhanging the outrigger, adjusting the vehicle to be horizontal, and curing the ground contact surface. Since experience and skill are required to operate the construction pillar car, it was necessary to secure human resources and time for the excavation work with the digging pillar car. Furthermore, in mountainous areas, tea plantations, orchards, and narrow lands, it is difficult to carry out boring machines such as burrows, so it was difficult to install external power supply electrodes using the shallow buried electrode method.

  In Patent Document 1, an external power supply electrode embedded in the ground is hardly soluble in a spiral tubular hand auger as a technology that enables installation of an external power supply electrode in a land where it is difficult to carry in a boring machine. It is disclosed that an electrode and a backfill are accommodated. According to the technique described in Patent Document 1, when the external power supply electrode is embedded in the ground, as shown in FIG. 2 of the same document, the hand auger is manually rotated around the axis to excavate it. When the hand auger reaches a predetermined depth in the ground, it can be left in the ground as it is, and the external power supply electrode can be installed only by excavation work without being restricted by land. ing.

JP-A-62-270787

  The technology described in Patent Document 1 is applied to the land where it is difficult to carry in the boring machine by making the external power supply electrode itself embedded in the ground into a shape that can be excavated and propelled, including a spiral tubular hand auger. Although it is possible to install the external power supply electrode, since the excavation work by rotating the hand auger needs to be carried out by human power, actually, even when the external power supply electrode installation depth is relatively shallow, Depending on the type of soil, etc., the reaction force during excavation could not be sufficiently handled, and it was difficult to proceed with excavation work.

  An object of the present invention is to provide an electrode structure that can be installed in a short time easily and at low cost when an electrode structure that supplies an anticorrosion current to an underground metal body is installed in the ground. An object of the present invention is to provide an installation unit, a coupling tool, and a method for cathodic protection of underground metal bodies using these.

  The present invention is an electrode structure installation unit for installing an electrode structure for supplying an anticorrosion current to an underground metal body at a predetermined depth from the ground, the electrode structure having a long shape in one direction And an excavation propulsion device that is detachably connected to one end in the longitudinal direction of the electrode structure via a connector, and rotates the electrode structure around an axial direction that is the longitudinal direction thereof, the electrode structure The electrode structure is rotated in the axial direction by operating the excavation propulsion unit in a state where the other longitudinal end of the excavation propulsion unit is in contact with the ground and the gripping portion provided in the excavation propulsion unit is gripped with fingers. Thus, the electrode structure installation unit is configured to be capable of excavating and propelling the electrode structure into the ground.

  The present invention also provides an electrode structure having a shape that is long in one direction and supplying an anticorrosion current to an underground metal body at a predetermined depth from the ground, and the electrode structure around an axial direction that is a longitudinal direction thereof. A connecting tool for connecting to a rotating excavator, comprising a connecting member having a long shape in one direction, and being used for connecting to the electrode structure at one end in the longitudinal direction of the connecting member. A coupling portion is provided, and a lead wire housing portion is provided in which a lead wire extending from the electrode structure is wound around an outer surface of the coupling member.

  The present invention also relates to a method of catalyzing an underground metal body using the electrode structure installation unit of the present invention, wherein the electrode structure has a longitudinal direction opposite to the connector side. With the one end abutting against the ground and holding the grip portion provided on the excavator with fingers, the excavator is operated to rotate the electrode structure around its longitudinal axis. A propulsion step of excavating and propelling the electrode structure from the ground to a predetermined depth, releasing the connection between the electrode structure and the connector, and lifting the connector from the ground. A decoupling step for leaving the body in the ground, and an electric circuit forming step for electrically connecting the electrode structure left in the ground and the DC power supply device installed on the ground via lead wires; Electrical corrosion protection for underground metal bodies It is.

  ADVANTAGE OF THE INVENTION According to this invention, when installing the electrode structure which supplies a corrosion-proof electric current to a underground metal body in the ground, the installation work can be implemented easily in a short time at low cost. Further, according to the present invention, since the electrode structure is excavated and propelled into the ground using a small, lightweight and highly maneuverable excavator that can be gripped with fingers and used, a large boring machine The electrode structure can be installed on land that is difficult to carry in, and the power source for excavation and propulsion of the electrode structure is a drilling propulsion machine that is more powerful than human power. Therefore, the electrode structure can be easily installed at various places.

FIG. 1 is a diagram showing a construction state after the implementation of the cathodic protection method for underground metal bodies according to the present invention, in which an electrode structure is installed in the vicinity of the underground metal body, and the electrodes in the ground It is a figure which shows typically the state by which the structure and the direct-current power supply device on the ground were electrically connected. FIG. 2 is a diagram showing a first stage of an embodiment of a propulsion process in the cathodic protection method for underground metal bodies of the present invention, and a side view of an embodiment of an electrode structure installation unit of the present invention. It is also a figure. FIG. 3 is a diagram illustrating a second stage of the propulsion process illustrated in FIG. 2, and is also a side view illustrating a modified example of the connector in the electrode structure installation unit. 4 is a schematic cross-sectional view along the longitudinal direction (axial direction) of the electrode structure in the electrode structure installation unit shown in FIG. FIG. 5 (a) is a schematic perspective view of a connecting member (basic connecting member) constituting a connecting tool in the electrode structure installation unit shown in FIG. 2, and FIG. 5 (b) shows the connecting member and the figure. FIG. 5 is a perspective view illustrating connection with the electrode structure shown in FIG. FIG. 6A is a schematic perspective view of a connecting member (extension connecting member) constituting the connecting member in the electrode structure installation unit shown in FIG. 3, and FIG. It is a perspective view explaining connection with the electrode structure shown in FIG. FIG. 7A is an enlarged perspective view schematically showing the engaging portion (receiving groove) of the electrode structure shown in FIG. 4 and its vicinity, and FIG. 7B is a schematic view of the engaging portion. FIG. FIG. 8 shows a state in which the engaging portion (projection) of the connector (extension connecting member) shown in FIG. 6 and the engaging portion (receiving groove) of the electrode structure shown in FIG. 7 are complementarily engaged. It is sectional drawing which shows the radial direction of this electrode structure typically shown. FIG. 9 is a diagram showing a first stage of another embodiment of the propulsion process in the cathodic protection method for underground metal bodies according to the present invention, and another embodiment of the electrode structure installation unit according to the present invention. It is also a side view of FIG. FIG. 10 is a view corresponding to FIG. 6B when a plurality of extension connecting members are used. FIG. 11 is an exploded perspective view of another embodiment of the electrode structure and connector according to the present invention. FIG. 12 is a schematic perspective view of a main part (engagement part with an electrode structure) of still another embodiment of the connector according to the present invention. FIG. 13 (a) is a schematic perspective view of a main part (engagement part with a connector) and a vicinity thereof in still another embodiment of the electrode structure according to the present invention, and FIG. It is a typical top view of an engaging part. FIG. 14A is a schematic view partially omitting a state (non-engaged state) in which the engaging portion of the coupler shown in FIG. 12 is inserted into the engaging portion (receiving groove) of the electrode structure shown in FIG. FIG. 14B is a perspective view schematically showing that the electrode structure or the connector is rotated in the axial direction from the state shown in FIG. 14A to connect the electrode structure and the connector. It is sectional drawing which follows the radial direction of this electrode structure which shows the state made to do typically. FIG. 15: is a typical perspective view of the principal part (engagement part with an electrode structure) of further another embodiment of the coupling device which concerns on this invention.

  The electrode structure installation unit of the present invention is used to install an electrode structure that supplies an anticorrosion current to an underground metal body at a predetermined depth from the ground by an electric protection method using an external power supply method. The As an underground metal body which is a to-be-protected body, a buried pipe, a steel pipe pile, an underground tank, etc. are mentioned, for example. The buried pipe extends through the concrete structure such as the valve chamber, common groove, and aqueduct, and extends to the inside and outside of the concrete structure. As a result, a macro cell is formed in which the portion in the soil of the buried pipe is the anode and the portion in the concrete is the cathode, and corrosion of the portion in the soil may be remarkably accelerated. Furthermore, the area of the cathode part (concrete part in the concrete) increases when it comes into contact with the steel material such as steel pipes and reinforcing bars at the contact part (through part) with the underground metal body in the concrete structure, Corrosion in the soil is further accelerated. The electrode structure installation unit of the present invention is useful for the implementation of an anticorrosion construction method using an external power supply system for preventing such corrosion.

  FIG. 1 shows a state of construction after the implementation of the electro-corrosion construction method (hereinafter also simply referred to as “the electro-corrosion construction method”) of the underground metal body of the present invention using the electrode structure installation unit of the present invention. An example is shown. In the construction state of FIG. 1, an electrode structure that supplies an anticorrosion current to the underground metal body 101 in the vicinity of the underground metal body 101 embedded in the depth range of the depth D from the ground 100 </ b> S in the soil 100. A plurality (three) of bodies 2 are installed. The plurality of electrode structures 2 are intermittently arranged at a predetermined interval in the extending direction of the underground metal body 101 (left-right direction in FIG. 1). The underground metal body 101 passes through the concrete structure 102 and is arranged over the inside and outside of the concrete structure 102, and is in contact with the soil 100 outside the concrete structure 102. The concrete structure 102 is provided with a steel material 102S such as a reinforcing bar, and the steel material 102S and the underground metal body 101 are penetrated by the underground metal body 101 in the concrete structure 102. It is in a state where it can touch.

  As shown in FIG. 1, a DC power supply 10 of an external power supply system is installed above the ground, that is, above the ground 100S. A plurality of electrode structures 2 in the soil 100 are electrically connected to the positive electrode side of the DC power supply device 10 via lead wires 27, and the underground metal body 101 is connected to the DC power via the lead wires 11. This is electrically connected to the negative electrode side of the power supply device 10, thereby forming an electric circuit capable of supplying a corrosion-proof current from the electrode structure 2 to the underground metal body 101. The separation distance between the underground metal body 101 and the electrode structure 2 is not particularly limited, and can be determined in consideration of the corrosion prevention range of the underground metal body 101.

  The depth range in which the electrode structure 2 is installed in the soil 100 substantially coincides with the depth range of the underground metal body 101, that is, the depth D (the distance from the ground 100S to the underground metal body 101). Although the depth D varies depending on the type of the underground metal body 101 and the like, the present invention can be applied not only when the depth D is relatively shallow but also when the depth D is relatively deep. It is possible to install the body 2 at a point of the depth D in the soil 100 easily and at low cost in a relatively short time. In particular, according to the present invention, as shown in FIG. 1, the installation position I of the electrode structure 2 in the soil 100 (the lower end of the electrode structure 2 and the tip 22A of the electrode protection member 22 described later) is preferably 2 from the ground 100S. It is useful when it is in the range of -10 m, more preferably in the range of 2-4 m.

  2 and 3 show an embodiment of a propulsion process which is one process in the cathodic protection method of the present invention. FIG. 2 shows the first stage (initial stage) of the propulsion process, and FIG. 3 shows the second stage (mid to late stage) of the propulsion process. In the propulsion step, as shown in FIGS. 2 and 3, an operator indicated by a symbol W in the figure uses an electrode structure installation unit 1 which is an embodiment of the electrode structure installation unit of the present invention. The excavation propulsion device 4 that is one of the constituent members of the unit 1 is grasped with a finger and operated, and the electrode structure 2 that is one of the constituent members of the unit 1 is rotated around its axial direction, that is, the shaft By rotating around the direction, the electrode structure 2 is excavated and propelled to the vicinity of the underground metal body 101 (see FIG. 1) at a predetermined depth D from the ground 100S.

  As shown in FIGS. 2 and 3, the electrode structure installation unit 1 includes an electrode structure 2, a connector 3, and an excavation propulsion device 4. These members 2, 3 and 4 are detachable from each other. When the electrode structure installation unit 1 is used, as shown in FIG. 2, the members 2, 3 and 4 are connected in series to each other, and the electrode structure installation unit When not in use, the members 2, 3, 4 can be stored independently by releasing their connection.

  The connector 3 includes a hollow tubular connecting member 31 that is long in one direction. One end of the connecting member 31 in the longitudinal direction is connected to the electrode structure 2 and the other end is connected to the excavation propulsion unit 4. In the present embodiment, the connector 3 includes a plurality of connecting members 31, and the plurality of connecting members 31 can be used as appropriate according to the progress of the propulsion process. For example, in the first stage, which is the initial stage of the propulsion process, as shown in FIG. 2, one connecting member 31A is used as the connecting member 31 constituting the connector 3, and the middle stage or the latter stage of the propulsion process. In a certain second stage, as shown in FIG. 3, two connecting members 31 </ b> A and 31 </ b> B can be used as the connecting member 31 constituting the connecting tool 3. The connection member 31A is a basic connection member connected to the excavator 4, and the connection member 31B is connected between the basic connection member 31A and the electrode structure 2 to extend the connection tool 3. The connector 3 includes a basic connecting member 31A and an extending connecting member 31B. The plurality of connecting members 31A and 31B are detachably connected in series with each other. Details of the connector 3 will be described later.

  FIG. 4 shows the electrode structure 2. The electrode structure 2 has a long shape in one direction, specifically a rod shape, and the axial direction of the electrode structure 2 coincides with the longitudinal direction X of the electrode structure 2. The longitudinal direction (axial direction) X of the electrode structure 2 is also the longitudinal direction (axial direction) of the electrode structure installation unit 1 having the same. One direction of the longitudinal direction (axial direction) X of the electrode structure 2 coincides with the excavation direction X1 when the electrode structure 2 is excavated and propelled into the soil 100.

  As shown in FIGS. 2 to 4, the electrode structure 2 includes an insoluble rod-shaped electrode 21 and an electrode protection member 22 that includes the electrode 21 and forms the outer surface of the electrode structure 2. Excavation blades 23 are intermittently arranged in the longitudinal direction X on the outer surface (outer peripheral surface) of the electrode protection member 22. When the electrode structure 2 includes the excavation blades 23, the excavation propulsion unit 4 is operated when the excavation propulsion unit 4 is operated to rotate the electrode structure 2 around the axial direction to excavate the soil 100. The rotational reaction force applied to the worker W holding the finger with the fingers is reduced.

  The electrode protection member 22 has a hollow cylindrical shape, and a backfill 24 is further accommodated in the inside (hollow portion) in addition to the electrode 21 as shown in FIG. The electrode 21 is disposed in the center of the radial direction Y orthogonal to the longitudinal direction X inside the electrode protection member 22, and extends in the longitudinal direction X. The backfill 24 is filled in a gap between the electrode 21 and the electrode protection member 22 inside the electrode protection member 22. The electrode 21 is surrounded by the backfill 24 while being in contact with the backfill 24. As a material of the electrode 21, those usable as an electrode in this type of external power source type anticorrosion can be used without particular limitation, and examples thereof include metal oxide-coated titanium (MMO) and platinized titanium. The backfill 24 is preferably one that can reduce the ground resistance of the electrode (anode) 21 and can generate a sufficient anticorrosion current from the electrode 21, and includes, for example, coke, graphite, and the like. it can.

  As shown in FIG. 4, the electrode protection member 22 has one end in the longitudinal direction X as a closed end and the other end as an open end, the closed end being a tip 22A in the excavation direction X1, and the open end being an excavation direction X1. This is the rear end 22B. The material for the electrode protection member 22 is preferably a material that is conductive and can withstand earth pressure. As such a material, for example, steel is preferable.

  As shown in FIG. 4, the distal end portion of the electrode protection member 22, that is, the distal end 22A of the electrode protection member 22 and the vicinity thereof are gradually reduced in diameter toward the outside in the longitudinal direction X to form a cone shape. Is sharp. On the other hand, the rear end portion of the electrode protection member 22, that is, the rear end 22B of the electrode protection member 22 and the vicinity thereof include the rear end 22B, and a small diameter portion 221 having a relatively short diameter and a large diameter having a relatively large diameter. And a tapered portion 222 that is located between the small diameter portion 221 and the large diameter portion 223 and gradually decreases in diameter from the large diameter portion 223 toward the small diameter portion 221. The large diameter portion 223 is a portion other than the front end portion and the rear end portion of the electrode protection member 22, and constitutes the main body of the electrode protection member 22. Each of the small diameter portion 221 and the large diameter portion 223 has a constant diameter over the entire length in the longitudinal direction X.

  As shown in FIG. 4, an outer cylinder 25 is fitted on the rear end portion of the electrode protection member 22. The outer cylinder 25 has a hollow cylindrical shape whose diameter is longer than the large-diameter portion 223 which is the portion having the maximum diameter in the electrode protection member 22 and whose diameter is constant over the entire length in the longitudinal direction X. The outer cylinder 25 covers the entire outer surface of each of the small diameter portion 221 and the tapered portion 222 of the electrode protection member 22 and the outer surface of the large diameter portion 223 near the tapered portion 222. In this manner, the relatively long outer cylinder 25 and the relatively short diameter small-diameter portion 221 are arranged concentrically, so that the electrode protection member 22 has a rear end 22B in the longitudinal direction X between them. A space portion extending inward for a predetermined distance is formed, and the space portion serves as a receiving groove 26 that is an engaging portion used when the electrode structure 2 and the connector 3 are connected. Function. The outer cylinder 25 is longer than the large-diameter portion 223 and is externally fitted to the large-diameter portion 223 in the vicinity of the engaging portion, so that soil enters the engaging portion when excavating and propelling. Therefore, it is easy to release the connection between the electrode structure 2 and the connector 3 at the engaging portion.

  As shown in FIGS. 2 and 3, the excavation blade 23 is continuously formed in a spiral shape from the vicinity of the front end 22 </ b> A toward the rear end 22 </ b> B on the outer surface of the electrode protection member 22. The excavation blades 23 may be formed integrally with the electrode protection member 22 or may be fixed to the outer surface of the electrode protection member 22 by a fixing means such as welding.

  From the viewpoint of facilitating excavation and propulsion of the electrode structure 2, the excavation blades 23 are preferably disposed over three-fifths or more of the total length L1 of the electrode protection member 22 in the longitudinal direction X. The excavation blades 23 may be arranged over the entire length L1 of the electrode protection member 22. In the present embodiment, as shown in FIG. 4, the excavation blade 23 does not extend over the entire length L1 of the electrode protection member 22 in the longitudinal direction X, but is unevenly distributed on the tip 22A side. In FIG. 4, a portion denoted by reference numeral 230 is an arrangement portion of the excavation blades 23 in the electrode protection member 22. The total length L1 of the electrode protection member 22 is not particularly limited, but is usually about 1000 to 1600 mm.

  As shown in FIG. 4, the pitch P in the longitudinal direction X of the excavation blades 23, that is, the distance between the tops of the excavation blades 23 adjacent in the longitudinal direction X is the maximum of the arrangement portion 230 of the excavation blades 23 in the electrode protection member 22. It is preferable that the projection length L3 of the excavation blade 23 from the outer surface of the electrode protection member 22 is substantially equal to the diameter L2 and shorter than one third or less of the maximum diameter L2. In the present embodiment, the arrangement portion 230 of the excavation blades 23 in the electrode protection member 22 includes a cone-shaped portion 231 including a tip 22A (a portion where the diameter varies in the longitudinal direction X) and the cone-shaped portion 231. The large-diameter portion 223 has a longer diameter than the cone-shaped portion 231, and therefore the diameter (outer diameter) of the large-diameter portion 223 is as follows. This is the maximum diameter L2 of the arrangement portion 230. As described above, in the electrode protection member 22, both the substantially equal relationship “pitch P≈maximum diameter L2” and the magnitude relationship “protrusion length L3 <maximum diameter L2 / 3” are established. Since the resistance received during excavation propulsion in the ground is reduced, the excavation propulsion unit 4 that is a power source for excavating and propelling the electrode structure 2 has dimensions and weight that can be manually operated as will be described later. Even when the power is smaller than that of a boring machine used as a power source for excavation propulsion, the electrode structure 2 can be easily excavated and propelled to a predetermined underground depth.

From the viewpoint of ensuring the above-described effects, the ratio between “pitch P of the excavation blades 23” and “maximum diameter L2 of the arrangement portion 230 of the excavation blades 23 in the electrode protection member 22” is the former≈ On the premise of the latter, the former / the latter is preferably 0.92 to 1.08, more preferably 0.95 to 1.05.
The pitch P (see FIG. 4) of the excavation blades 23 is preferably 45 to 75 mm, and more preferably 50 to 70 mm.
The maximum diameter L2 (see FIG. 4, corresponding to the diameter (outer diameter) of the large-diameter portion 223 in the present embodiment) of the arrangement portion 230 of the excavation blades 23 in the electrode protection member 22 is preferably 45 to 75 mm, more preferably 50. ~ 70 mm.

From the same point of view, the ratio between the “projection length L3 of the excavation blade 23” and “one third of the maximum diameter L2 of the arrangement portion 230 of the excavation blade 23 in the electrode protection member 22” is based on the former <the latter. The former / the latter is preferably 0.2 to 0.8, more preferably 0.3 to 0.7.
The protrusion length L3 (see FIG. 4) of the excavation blades 23 is preferably 4.5 to 22.5 mm, and more preferably 6 to 14 mm.

  As shown in FIG. 1, the electrode structure 2 includes a lead wire 27 having one end connected to the electrode 21 and the other end connected to a DC power supply 10 that is separate from the electrode structure installation unit 1. ing. The lead wire 27 extends from the rear end 22B of the electrode protection member 22 to the outside of the electrode protection member 22 as shown in FIG. 4, and is connected to the DC power supply device 10 as shown in FIGS. The side is exposed to the outside of the electrode protection member 22. As shown in FIG. 4, the lead wire 27, inside the electrode protection member 22, floats inside the small diameter portion 221 on the rear end 22 </ b> B side of the electrode protection member 22 with the conduit 28 attached to the outer surface. Thus, a space is formed between the small diameter portion 221 and the conduit 28, and the lead wire 27 has a certain degree of freedom in the space with the conduit 28 attached. It is made to move. The conduit 28 is exposed to the outside of the electrode protection member 22 together with the lead wire 27, and is lifted to the ground after a series of cathodic protection methods.

  The excavation propulsion device 4 rotates the electrode structure 2 connected to the excavation propulsion device 4 via a connector 3 around the axial direction of the electrode structure 2, as shown in FIGS. 2 and 3. When the electrode structure installation unit 1 is used, the electrode structure 2 is connected to one end in the longitudinal direction X of the electrode structure 2, more specifically, to the rear end 22 </ b> B of the electrode protection member 22 via the connector 3. The electrode structure installation unit 1 operates the excavator 4 in a state where the other end of the electrode structure 2 in the longitudinal direction X, more specifically, the tip 22A of the electrode protection member 22 is in contact with the ground 100S. By rotating the electrode structure 2 around the axial direction, the electrode structure 2 can be excavated in the soil 100 as shown in FIG.

  As shown in FIGS. 2 and 3, the excavation propulsion device 4 includes a rotation drive unit 41 that rotates the electrode structure 2 around the axial direction, and a gripping unit 42. The rotation drive unit 41 includes an electric motor (not shown) that uses a commercial power source as a power source, a speed reducer (not shown) that decelerates the rotational output of the electric motor, and an output shaft that is driven at the reduced rotational speed. (Not shown). On the outer surface of the excavator 4, a switch (not shown) of the electric motor is provided, and the electric motor can be driven / stopped by manually turning on / off the switch. The basic configuration of the rotation drive unit 41 is the same as this type of rotation drive source. The excavator 4 can rotate the electrode structure 2 in both directions around the axial direction.

  The gripping portion 42 is a portion that is held by a user of the excavation propulsion device 4 with fingers, and supports the excavation propulsion device 4 by hand when the excavation propulsion device 4 (electrode structure installation unit 1) is used. It is a part used for. In other words, the excavator 4 is provided with such a gripping portion 42. In other words, the size and weight of the excavator 4 are within a range that can be handled by hand, that is, the excavator 4 is small. It means that it is lightweight and excellent in mobility. The excavation propulsion machine 4 serving as a power source for excavating and propelling the electrode structure 2 has such a gripping portion 42 and can be handled by hand, so that it is difficult to carry in a large boring machine. It is possible to install the electrode structure 2 on a rough land.

  Although the dimension of the excavator 4 is not particularly limited, the length in the longitudinal direction (the same direction as the longitudinal direction X) is preferably 800 mm or less, and more preferably from the viewpoint of being small, lightweight, and excellent in mobility. The length in the lateral direction is preferably 600 mm or less, more preferably 400 to 550 mm, and the depth is preferably 500 mm or less, more preferably 300 to 450 mm. From the same viewpoint, the weight of the excavator 4 is preferably 40 kg or less, more preferably 10 to 30 kg.

  The grip 42 may be configured so that it can be gripped with fingers when the excavator 4 is used so that the excavator 4 can be supported by hand, and the shape thereof is not particularly limited. In the electrode structure installation unit 1, as shown in FIG. 2, the excavation propulsion device 4 has a support portion 43 that supports the rotation drive portion 41 from below, and the grip portion 42 is rotationally driven by the support portion 43. It is attached so as to surround the part 41, and the rotation drive part 41 and the grip part 42 are not in contact with each other. Since the grip portion 42 is a frame that surrounds the rotation drive portion 41 in a non-contact state, even when the grip portion 42 is gripped with fingers during use of the excavator 4, the excavator The vibration of 4 is difficult to be transmitted to fingers, and the handling of the excavator 4 can be further improved.

  The electrode structure 2 and the excavation propulsion device 4 described above are connected via a connector 3 as shown in FIGS. 2 and 3. As described above, the connecting tool 3 is connected as a plurality of connecting members 31 to the basic connecting member 31A connected to the excavator 4 and between the basic connecting member 31A and the electrode structure 2 so that the connecting tool 3 is connected. And an extension connecting member 31B. Each of the connecting members 31 </ b> A and 31 </ b> B has a shape (tubular) that is long in one direction, and the longitudinal direction (axial direction) coincides with the longitudinal direction (axial direction) X of the electrode structure 2.

  FIG. 5 shows a basic connecting member 31A, and FIG. 6 shows an extending connecting member 31B. At one end in the longitudinal direction (axial direction) X of the connecting member 31 (31A, 31B), an engaging portion 32 used for connecting to the electrode structure 2 is provided. The electrode structure 2 is detachably connectable.

  As shown in FIG. 5A, the basic connecting member 31A has an engaging portion 32A for connecting to the electrode structure 2 at one end in the longitudinal direction X. As shown in FIG. The electrode structure 2 is detachably connected via the joint portion 32A. In the first stage of the propulsion process shown in FIG. 2, the electrode structure 2 and the basic connecting member 31A are connected and used via the engaging portion 32A.

  As shown in FIG. 6A, the extension connecting member 31B has an engaging portion 32B for connecting to the electrode structure 2 at one end in the longitudinal direction X, and as shown in FIG. The electrode structure 2 is detachably connected via the engaging portion 32B. In the second stage of the propulsion step shown in FIG. 3, the electrode structure 2 and the extension connecting member 31B are detachably connected via the engaging portion 32B, and the extension connecting member 31B and the basic connecting member 31A are further connected. Are connected in a fixed state via the engaging portion 32A.

  For the connection between the basic connecting member 31A and the extending connecting member 31B shown in FIG. 6, the engaging portion 35 of the connecting member 31B is used together with the engaging portion 32A of the connecting member 31A. The engagement portion 35 of the extension connection member 31B is a connection engagement portion with the basic connection member 31A, and is provided on the side opposite to the connection engagement portion 32B with the electrode structure 2. The engaging portion 32A of the basic connecting member 31A and the engaging portion 35 of the extending connecting member 31B are fitted together, and the engaging tool insertion holes 37 formed in both engaging portions 32A and 35 overlap each other. In this state, by inserting a locking tool (not shown) such as a screw, bolt, or pin into the locking tool insertion hole 37, both the connecting members 31A and 31B are connected in a fixed state. The engagement between the engagement portion 32A and the engagement portion 35 may be configured such that the engagement portion 32A is externally fitted to the engagement portion 35, that is, the engagement portion 32A is fitted outside the engagement portion 35. The opposite configuration may be used.

  As shown in FIG. 5, the other end in the longitudinal direction X of the basic connecting member 31 </ b> A connected to the excavator 4 is used for connection with the excavator 4 on the opposite side to the engaging portion 32 </ b> A side. An output shaft connecting portion 33 connected to the output shaft (not shown) of the rotary drive portion 41 provided in the excavator propulsion machine 4 is provided. As shown in FIGS. 2 and 3, the output shaft connecting portion 33 is formed so that the output shaft can be externally fitted and meshed.

  As shown in FIGS. 2 and 3, a lead wire accommodating portion 34 around which a lead wire 27 extending from the electrode structure 2 is wound is provided on the outer surface (outer peripheral surface) of the connector 3. In the present embodiment, as shown in FIG. 5, the lead wire accommodating portion is provided on the outer surface of the basic connecting member 31 </ b> A that is one of a plurality of connecting members 31 constituting the connecting tool 3 and connected to the excavator propulsion unit 4. 34 is provided.

  As shown in FIG. 5, the lead wire accommodating portion 34 includes a plurality of (two) flange portions 341 that are formed on the outer surface of the basic connecting member 31 </ b> A so as to protrude at a predetermined interval in the longitudinal direction X of the basic connecting member 31 </ b> A. It is formed as a portion sandwiched between 342. Of the plurality of flange portions 341 and 342, the flange portion 341 closest to the electrode structure 2 in the state where the basic connecting member 31 is connected to the electrode structure 2, that is, closest to the engaging portion 32A, A lead wire insertion portion 343 that is used when the lead wire 27 is passed from the electrode structure 2 side to the lead wire housing portion 34 side is formed.

  Since the connecting part 3 (basic connecting member 31A) connected to the electrode structure 2 is provided with the accommodating portion 34 of the lead wire 27 extending from the electrode structure 2, the length of the lead wire 27 is reduced. Even if it is relatively long, it can be stored in a well-organized manner, and inconveniences such as disconnection due to twisting of the lead wire 27 are prevented. Moreover, in the cathodic protection method of the underground metal body 101 using the electrode structure installation unit 1, the electrode structure 2 is connected in a state where the electrode structure 2 and the connector 3 are connected, as will be described later. When the electrode structure 2 and the lead wire 27 rotate together, the lead wire 27 can be prevented from being twisted. Thereafter, the lead wire 27 is connected to the DC power supply device 10. It is possible to smoothly perform the operation (electric circuit forming step) of connecting to the cable.

  The connection mechanism between the electrode structure 2 and the connector 3 will be described. In the electrode structure installation unit 1, as shown in FIGS. 5 and 6, the electrode structure 2 is used for connection to the connector 3. And the coupling 3 (coupling members 31A and 31B) has an engagement portion 32 (32A and 32B) that engages with the receiving groove 26 in a complementary manner. The electrode structures 2 and the connector 3 are connected by the joint portions 26 and 32 being complementarily engaged with each other.

  Hereinafter, the connection mechanism will be described with reference to the connection between the electrode structure 2 and the extension connection member 31B (see FIG. 3 and FIG. 6B) as an example. Is also applied as appropriate to the connection between the electrode structure 2 and the basic connection member 31A (see FIGS. 2 and 5B). In the engaging portion 32A of the basic connecting member 31A, the same components as those of the engaging portion 32B of the extending connecting member 31B are denoted by the same reference numerals as those in the engaging portion 32B, and description thereof is omitted.

  FIG. 7 shows a receiving groove 26 that is an engaging portion of the electrode structure 2. As described above, the receiving groove 26 of the electrode structure 2 includes the outer cylinder 25 fitted on the rear end portion of the electrode protection member 22 (the rear end 22B and its vicinity), the small diameter portion 221 of the electrode protection member 22, and Is formed along the circumferential direction of the electrode protection member 22, and the rear end 22B side is open to communicate with the outside. In the present embodiment, the space between the outer cylinder 25 and the small diameter portion 221 is separated by a partition member 29 that is intermittently arranged at equal intervals in the circumferential direction (around the axial direction) of the electrode protection member 22. Each of the plurality of sections serves as a receiving groove 26, and three receiving grooves 26 are formed at the rear end of the electrode structure 2.

  On the other hand, the engaging portion 32B of the extending connecting member 31B is provided at one end in the axial direction (longitudinal direction) X of the connecting member 31B and protrudes outward in the axial direction X as shown in FIG. And a protrusion 321. In the present embodiment, a plurality (three) of protrusions 321 are intermittently arranged in the circumferential direction (around the axial direction) of the extension connecting member 31B, and a notch is formed between two protrusions 321 and 321 adjacent in the circumferential direction. The protrusions 321 and the groove portions 322 are alternately formed in the circumferential direction of the connecting member 31B. The protrusion 321 is a portion that is inserted into the receiving groove 26 that is an engaging portion of the electrode structure 2 when connecting the electrode structure 2 and the extension connecting member 31 </ b> B, and corresponds to the shape of the receiving groove 26. The outer shape is formed, and the same number (three) as the receiving grooves 26 are formed.

  In order to connect the electrode structure 2 and the extension connecting member 31B as shown in FIGS. 3 and 6B, the protrusion 321 of the extension connecting member 31B is inserted into the receiving groove 26 of the electrode structure 2. By doing so, the protrusions 321, the electrode protection member 22 (small diameter portion 221) that defines the receiving groove 26, and the outer cylinder 25 are complementarily engaged (fitted), and the electrode structure 2 is extended. The connecting member 31B is detachably connected. The same applies to the case where the electrode structure 2 and the basic connecting member 31A are connected as shown in FIGS. 2 and 5B. FIG. 8 schematically shows a state in which the protrusion 321 is inserted into the receiving groove 26 and the both are complementarily engaged. The width of the receiving groove 26 (the length in the radial direction of the electrode structure 2) and the length in the circumferential direction are such that the protrusion 321 is loosely fitted with a certain margin in a state where the protrusion 321 is inserted into the receiving groove 26. Therefore, even if the operation of inserting the protrusion 321 into the receiving groove 26 is somewhat rough, the protrusion 321 can be inserted into the receiving groove 26 and engaged with the electrode structure 2. The workability at the time of connecting the connector 3 is improved.

  The electrode structure 2 and the connector 3 are connected as shown in FIG. 3, that is, the electrode structure 2 and the extension connecting member 31B are connected, and the connecting member 31B and the basic connecting member 31A are connected. In this state, the lead wire 27 extending outward from the rear end 22B of the electrode protection member 22, that is, the rear end of the electrode structure 2, passes through the inside of the connecting member 31B, and engages 32A in the connecting member 31A. From the groove portion 322 (see FIG. 5A), it extends outside and is wound around the lead wire accommodating portion 34 of the connecting member 31A. In a state where the engaging portion 32A of the basic connecting member 31A and the engaging portion 35 of the extending connecting member 31B are fitted as shown in FIG. 6B and the members 31A and 31B are connected, the engaging portion 32A. The groove portion 322 of the groove portion 322 is not covered by the engaging portion 35 but is partially exposed (a portion close to the connecting member 31A), and the exposed portion (engagement portion) of the groove portion 322 is exposed. The non-covered portion by 35) functions as an insertion port for the lead wire 27. In addition, the function as a lead wire insertion port of such a groove part 322 is the state which the electrode structure 2 and the connection tool 3 connected as shown in FIG. 2, ie, the electrode structure 2 and the basic connection member 31A connected. The same goes for the state.

  Next, the cathodic protection method of the present invention will be described based on an embodiment using the electrode structure installation unit 1 described above. The construction state shown in FIG. 1 is obtained by carrying out the cathodic protection construction method of the present embodiment. The cathodic protection method according to the present embodiment includes a propulsion process (see FIGS. 2 and 3) for excavating and propelling the electrode structure 2 from the ground 100S to a predetermined depth D, and the connection between the electrode structure 2 and the connector 3. Is released, the connection tool 3 is pulled up from the ground, that is, the soil 100, and the connection release process for leaving the electrode structure 2 in the soil 100, the electrode structure 2 left in the soil 100, and the ground And an electric circuit forming step of electrically connecting the DC power supply device 10 thus made through the lead wire 27.

  As preparatory work before the implementation of the propulsion process, the shape, size, depth, position, etc. of the underground metal body 101 are investigated by test digging or pressing of an exploration rod, and a point for propelling the electrode structure 2 is determined. It is desirable. By carrying out this preparatory work, it is possible to prevent an accident of damaging the underground metal body 101 resulting from the implementation of the cathodic protection method.

  In carrying out the propulsion step, the components 1 (electrode structure 2, connector 3, excavation propulsion device 4) of the electrode structure installation unit 1 in a separate and independent state are released from each other and connected to each other. Assemble. In the present embodiment, only the basic connection member 31A is used as the connection tool 3 during the first stage of the propulsion process, that is, from when the excavation starts until the electrode structure 2 reaches a relatively shallow underground depth ( 2), the connector 3 and the excavator 4 are connected before the propulsion step. At that time, as shown in FIG. 5 (b), the output shaft connecting portion 33 of the basic connecting member 31 </ b> A and the output shaft of the rotary drive portion 41 of the excavator 4 are connected. In addition, the connection between the electrode structure 2 and the basic connection member 31A can be performed in the same manner as the connection between the electrode structure 2 and the extension connection member 31B described above. What is necessary is just to insert the protrusion 321 (refer Fig.5 (a)) of 31 A of basic connection members in the receiving groove 26 which is a joint part. Moreover, the rotational drive part 41 of the excavation propulsion machine 4 is connected to a commercial power source (for example, 200 V).

  In the propulsion step, the tip 22A of the electrode protection member 22 that is one end in the longitudinal direction X opposite to the connector 3 (basic connecting member 31A) side of the electrode structure 2 of the electrode structure installation unit 1 is placed on the ground 100S. The electrode structure 2 is rotated around the axial direction by operating the excavation propulsion unit 4 in a state where the excavation propulsion unit 4 is in contact with the gripping portion 42 provided on the excavation propulsion unit 4 of the unit 1 with fingers. The body 2 is excavated and propelled from the ground 100S to a predetermined depth (see FIG. 2).

  When the electrode structure 2 excavates and promotes in the soil 100 and reaches a predetermined underground depth shallower than the target underground depth, for example, when almost the entire electrode structure 2 is buried in the soil 100, the promotion is performed. The process moves from the first stage to the second stage. That is, as the connection tool 3, a connection body of the basic connection member 31A and the extension connection member 31B is used, and the electrode structure 2 is further excavated deeply underground. Specifically, after the operation of the excavator 4 is temporarily stopped and the connection between the electrode structure 2 and the basic connecting member 31A and the connection between the connecting member 31A and the excavator 4 are respectively released, FIG. As shown in FIG. 5B, the extension member 31B is interposed between the electrode structure 2 and the connecting member 31A, and the members 2, 3 and 4 are connected to each other to connect the electrode structure installation unit 1 to each other. Reassemble. And the said promotion process is restarted using the assembled electrode structure installation unit 1 (refer FIG. 3).

  When the electrode structure 2 reaches the target underground depth, the connection between the electrode structure 2 and the connection tool 3 (the connection body of the basic connection member 31A and the extension connection member 31B) is released, and the connection tool 3 and The excavator 4 is integrally lifted from the ground, and only the electrode structure 2 is left in the ground (connection release process). As described above, the electrode structure 2 and the extension connecting member 31B are connected by inserting the protrusion 321 of the engaging portion 32B of the connecting member 31B into the receiving groove 26 that is the engaging portion of the electrode structure 2. The connection between the two can be easily released by lifting the connector 3 to the ground. A pulley, a rope, or the like may be used for this lifting work as necessary. Since the extension connecting member 31B, the basic connecting member 31A, and the excavation propulsion unit 4 are connected to each other in a fixed state, the connection is not released when they are pulled up to the ground.

  When only the electrode structure 2 is left in the soil 100, the electrode structure 2 and the DC power supply device 10 installed on the ground are electrically connected via the lead wire 27 extending from the electrode structure 2. (Electric circuit forming step). Separately, the underground metal body 101 and the DC power supply device 10 are electrically connected via the lead wire 11. Thus, the construction state as shown in FIG. 1 is completed.

  According to the cathodic protection method of the present embodiment, when the electrode structure 2 that supplies the anticorrosion current to the underground metal body 101 is installed in the ground, more specifically, for example, the electrode structure in the soil 100 When the electrode structure 2 is installed so that the installation position I of 2 (see FIG. 1, the lower end of the electrode structure 2) is in a depth range of 2 to 10 m from the ground 100S, the installation work can be easily performed in a short time. It can be implemented at low cost. Further, according to the cathodic protection method of this embodiment, the electrode structure 2 is excavated and propelled into the ground using the excavator 4 that is small, lightweight, and excellent in mobility, which can be used by being gripped with fingers. Therefore, the electrode structure 2 can be installed on a land where it is difficult to carry in a large boring machine, such as a mountainous area, a tea plantation, an orchard, or a narrow land. Furthermore, according to the cathodic protection method of this embodiment, the electrode structure 2 employs the excavation propulsion device 4 stronger than human power as a power source for propelling the soil 100, and propels the soil 100. Since the rotational force necessary for the transmission is smoothly transmitted from the excavator 4 to the electrode structure 2, the conventional anticorrosion construction method using a hand auger as described in Patent Document 1 has a hard soil and construction is difficult. The electrode structure 2 can be easily installed on difficult land.

  In particular, according to the cathodic protection method of the present embodiment, the connector 3 includes the basic connecting member 31A and the extension connecting member 31B, and the length of the connector 3 in the longitudinal direction is appropriately combined. That is, since the length in the excavation direction can be adjusted, the propulsion depth of the electrode structure 2 can be easily adjusted by properly using the plurality of connecting members 31A and 31B according to the target installation depth of the electrode structure 2. It is possible to cope with various constructions.

  In particular, according to the cathodic protection method of the present embodiment, the engaging portion (receiving groove 26) of the electrode structure 2 and the engaging portion 32 of the connector 3 (the engaging portion 32A of the basic connecting member 31A, for extension) The electrode structure 2 and the connection tool 3 are connected by complementary engagement with the engaging portion 32B) of the connection member 31B, and the connection tool 3 is opposite to the electrode structure 2 side from the connected state. Since the connection state can be released by a simple operation by simply pulling it to the side, such connection release and the subsequent lifting operation of the connection tool 3 from the ground can be performed very efficiently.

  In particular, according to the cathodic protection method of the present embodiment, since the lead wire 27 extending from the electrode structure 2 is wound around the lead wire accommodating portion 34 in the basic coupling member 31A of the coupler 3, the electrode structure When excavating and propelling 2 in the soil 100, the electrode structure 2 and the lead wire 27 rotate together, and the lead wire 27 can be prevented from being twisted, and the electric circuit forming step is performed very efficiently. be able to.

  Hereinafter, other embodiments of the present invention will be described with reference to FIGS. Regarding other embodiments to be described later, components different from those of the above-described embodiment (electrode structure installation unit 1) will be mainly described, and the same components will be denoted by the same reference numerals, and description thereof will be omitted. The description of the above embodiment is applied as appropriate to components that are not particularly described.

  The electrode structure installation unit 1A shown in FIG. 9 reduces the reaction force (rotation reaction force) that acts on the gripping portion 42 of the excavation propulsion machine 4 when the electrode structure 2 excavates and propels the soil 100. A force receiving member 5 is provided. As shown in FIG. 9, the reaction force receiving member 5 has a shape that is long in one direction, specifically a rod shape, is configured to be extendable in the longitudinal direction, and one end in the longitudinal direction is the connector 3 or the excavator. 4 is used with the other end in the longitudinal direction coming into contact with the ground.

  More specifically, the reaction force receiving member 5 includes a hollow rod-shaped main body 51 whose one end in the longitudinal direction (axial direction) is a closed end and the other end is an open end, and an interior (hollow portion) of the main body 51. And a rod 52 slidably disposed in the longitudinal direction of the main body 51, and one end of the rod 52 in the longitudinal direction extends from the open end of the main body 51. A stone bump 53 is attached to the tip of the part. As the rod 52 slides within the main body 51, the reaction force receiving member 5 expands and contracts in the longitudinal direction. A bracket 54 for connecting the reaction force receiving member 5 is provided below the rotation drive unit 41 of the excavator propulsion unit 4 in the electrode structure installation unit 1A. By connecting the closed end to the bracket 54 via the pin 55, the reaction force receiving member 5 is connected to be rotatable around the pin 55.

  When the propulsion process is performed using the electrode structure installation unit 1A, as shown in FIG. 9, the tip of the rod 52 on which the stone protrusion 53 is attached is locked to the anchor 56 driven into the ground 100S. The stone bump 53 is brought into contact with the ground surface 100S while making it go. By performing the propulsion process using the electrode structure installation unit 1A, the ground reaction force receiving member 5 receives the reaction force of the rotation when the electrode structure 2 excavates and promotes the soil 100 through the ground 100S. Therefore, it becomes difficult for the worker W who supports the excavation propulsion machine 4 by hand to exert the rotational reaction force, and the worker can carry out the propulsion process with one worker W. Labor saving is achieved.

  In the form shown in FIG. 10, the connector 3 includes one basic connecting member 31A and two extending connecting members 31B and 31C. The connection members 31A to 31C and the electrode structure 2 and the excavator 4 can be connected in the same manner as in the above embodiment. In the present invention, the number of extension connecting members is not particularly limited, and may be three or more.

  In the form shown in FIG. 11, the engaging portions (projections 224) of the electrode structure 2A are inserted into the engaging portions (receiving grooves 36) of the connector 3A so that the engaging portions are engaged with each other in a complementary manner. In addition, the electrode structure 2A and the connector 3A are detachably connected to each other. As shown in FIGS. 5 to 7 in the above-described embodiment, the configuration of the engaging portion ( The projection 321) is opposite to the case where the projection 321) is inserted into the engaging portion (receiving groove 26) of the electrode structure 2.

  More specifically, as shown in FIG. 11, in the electrode structure 2 </ b> A, the engaging portion used for connection with the connector 3 </ b> A (extension connecting member 31 </ b> D) is the axial direction (longitudinal direction) of the electrode protection member 22. Direction) X, and has a protrusion 224 that protrudes outward in the axial direction X. In the form shown in FIG. 11, a plurality (three) of protrusions 224 are intermittently arranged in the circumferential direction (around the axial direction) of the electrode structure 2A, and the gap between the two protrusions 224 and 224 adjacent in the circumferential direction is cut. It is a notch-shaped groove part 225, and the protrusion 224 and the groove part 225 are alternately formed in the circumferential direction of the electrode structure 2A. The protrusions 224 have an outer shape corresponding to the shape of the receiving groove 36 and are formed in the same number (three) as the receiving grooves 36. Further, in the connector 3A, the engaging portion used for connection with the electrode structure 2A, more specifically, the engaging portion of the extension connecting member 31D has the receiving groove 36 into which the protrusion 224 is inserted. doing. The receiving groove 36 in the engaging portion is basically configured in the same manner as the receiving groove 26 (see FIG. 7) of the electrode structure 2 described above, and a protrusion is formed at one end in the longitudinal direction X of the extension connecting member 31D. The same number (three) of receiving grooves 36 as 224 are intermittently arranged along the circumferential direction (around the axial direction) of the connecting member 31D. A partition member is disposed between the receiving grooves 36 adjacent to each other in the circumferential direction.

  The coupling tool 3B shown in FIG. 12 and the electrode structure 2B shown in FIG. 13 have one of the engaging part of the electrode structure 2B and the engaging part of the coupling tool 3B inserted or fitted into the other, and the state. By rotating one of them from one direction to the other around the axial direction, the two coupling parts are complementarily engaged to connect the electrode structure 2B and the connector 3B, or either one of them from the connected state. Is rotated in a direction opposite to the one direction to release the connected state, and the connection or release of both is controlled by the rotation of the electrode structure 2B or the connecting tool 3B around the axial direction. It has been made possible.

  More specifically, the engaging portion 32 (projection 321) of the connector 3B shown in FIG. 12 and the receiving groove 26A as the engaging portion of the electrode structure 2B shown in FIG. By rotating the electrode structure 2B or the connecting tool 3B in one direction around the axial direction from the non-engaged state (see FIG. 14A) just inserted into the two, the two engaging portions are made complementary. The electrode structure 2B and the connector 3B can be connected by engaging (see FIG. 14B), and the electrode structure 2B or the connector 3B is opposite to the one direction from the connected state. The connected state can be released by rotating in the direction.

  More specifically, the engaging portion 32 of the connecting member 31 constituting the connecting tool 3B is provided at one end in the axial direction (longitudinal direction) X of the connecting member 31 as shown in FIG. Has a protrusion 321 protruding from the bottom. In the form shown in FIG. 12, a plurality (three) of protrusions 321 are intermittently arranged in the circumferential direction (around the axial direction) of the connecting member 31, and a notch is formed between two protrusions 321 and 321 adjacent in the circumferential direction. The protrusions 321 and the groove portions 322 are alternately formed in the circumferential direction of the connecting member 31. The protrusion 321 is a portion that is inserted into the receiving groove 26A that is an engaging portion of the electrode structure 2B when the electrode structure 2B and the connector 3B are connected, and has an outer shape corresponding to the shape of the receiving groove 26A. And the same number (three) as the receiving grooves 26A. And as shown in FIG.12 and FIG.14, the protrusion 321 in the connector 3B is a protrusion main body 321A extended in the axial direction (longitudinal direction) X of the connector 3B, and the axial direction from the front-end | tip part of this protrusion main body 321A ( A projecting portion 321B projecting in the circumferential direction). For this reason, in the protrusion 321, the portion including only the protrusion main body 321A and the portion including the protrusion main body 321A and the overhanging portion 321B (the tip portion of the protrusion 321) are all the length (circumference) around the axial direction of the connector 3B. Although the length in the direction is constant over the entire length of the protrusion 321 in the protruding direction (axial direction X), the latter, that is, the tip of the protrusion 321 is the former, ie, the non-existing portion of the overhang 321B. In comparison, the length around the axis is long. In the form shown in FIG. 12, the projecting portion 321B projects from both ends of the projection body 321A in the circumferential direction of the connector 3B (connecting member 31). It has a letter shape.

  On the other hand, as shown in FIG. 13, the receiving groove 26A as the engaging portion of the electrode structure 2B has an axial direction (longitudinal direction) X of the electrode structure 2B from the insertion opening into which the protrusion 321 of the connector 3B is inserted. A groove recess 261 extending inwardly, and an overhanging groove recess 262 projecting axially from the groove recess 261 at a position spaced a predetermined distance inward in the axial direction X from the insertion port. The receiving groove 26A has a shape corresponding to the shape of the protrusion 321 in plan view. In the form shown in FIG. 13, the groove 261 corresponds to the shape of the protrusion 321 being T-shaped in plan view. From the position corresponding to the protruding portion 321B when the protrusion 321 is inserted, the protruding groove concave portion 262 protrudes outward in the circumferential direction of the electrode structure 2B.

  FIG. 14A shows a non-engagement state in which the protrusion 321 is simply inserted from the insertion opening of the receiving groove 26A. In this non-engaged state, the receiving groove 26A and the protrusion 321 are not complementarily engaged, and the connector 3B is pulled along the axial direction (longitudinal direction) X on the side opposite to the electrode structure 2B side. And both are easily separated. However, from the non-engaged state shown in FIG. 14A, the receiving groove 26A (electrode structure 2B) or the protrusion 321 (connector 3B) is moved in one direction around the axial direction, for example, the symbol R2 in FIG. 14B. By slightly rotating in the direction shown, one of the pair of overhanging portions 321B and 321B of the protrusion 321 (the overhanging portion 321B on the tip side in the rotation direction R2) becomes the overhanging groove recess 262 of the receiving groove 26A. The protrusion 321 and the receiving groove 26A are complementarily engaged with each other, whereby the electrode structure 2B and the connector 3B are connected. In such a connected state of the electrode structure 2B and the connection tool 3B, even if the connection tool 3B is pulled to the side opposite to the electrode structure 2B side, the overhanging portion 321B of the connection tool 3B is not attached to the electrode structure 2B. Since the protruding groove recess 262 is caught by the member, the connection tool 3B is not pulled out from the electrode structure 2B and the connection is not released. That is, the extension groove recess 262 of the receiving groove 26A cooperates with the extension part 321B of the protrusion 321 of the connector 3B, thereby restricting the movement of the connector 3B in the axial direction (longitudinal direction) X. Function as.

  14B, the receiving groove 26A (the electrode structure 2B) or the protrusion 321 (the connection state) from the connection state (the engagement state between the receiving groove 26A and the protrusion 321) between the electrode structure 2B and the connector 3B shown in FIG. The connected state is released by slightly rotating the tool 3B) in the direction R1 which is the opposite direction to the rotational direction R2 to enter the disengaged state as shown in FIG.

  The electrode structure 2B or the connector 3B may be rotated around the axial direction from the non-engaged state shown in FIG. 14A manually, and the connector 3B is connected to the excavator 4. In such a case, the excavation propulsion machine 4 may be operated. After connecting the electrode structure 2B and the connector 3B in the manner described above, the connector 3B is further connected to the electrode structure 2B in a state where the excavator 4 is connected via the connector 3B. By rotating in the same direction (in the above example, the direction R2) when coupled, the electrode structure 2B and the rotation drive unit 41 of the excavator 4 are rotated together in the same direction. A propulsive force capable of excavating and propelling in the soil is stably applied to the electrode structure 2B.

  According to the electrode structure 2B and the connector 3B, when the electrode structure 2B or the connector 3B is rotated in one direction around the axial direction, the receiving groove 26A that is an engaging portion of the electrode structure 2B is projected. Since the groove recess 262 and the overhanging portion 321B of the engaging portion 32 of the coupling tool 3B are close to each other in the axial direction X and relatively restrict the movement in the same direction, the connection between the electrode structure 2B and the coupling tool 3B. Can be prevented, and problems such as disconnection due to twisting of the lead wire 27 can be prevented more reliably. The connection between the electrode structure 2B and the connection tool 3B in the connection release process is performed by operating the excavation propulsion machine 4 to slightly move the connection tool 3B in the direction opposite to the rotation direction of the electrode structure 2B in the promotion process. Since it can be performed only by rotating, it can be easily performed even when the electrode structure 2B is located deep underground so that it cannot be reached by a person on the ground. In addition, after the connection between the electrode structure 2B and the connector 3B is released in this manner, a part other than the electrode structure 2B in the electrode structure installation unit may be integrally lifted to the ground.

  In particular, in the embodiment shown in FIG. 14, there is a pair of projecting portions 321B on both outer sides in the circumferential direction of one projection body 321A, and correspondingly, a groove recess in which the projection body 321A is accommodated. Since there are a pair of overhang groove recesses 262 on both outer sides in the circumferential direction of H.261, the receiving groove 26A extends from the non-engaged state shown in FIG. 14 (b) in either the circumferential direction R1 or the other direction R2. Even if the (electrode structure 2B) or the protrusion 321 (connector 3B) is rotated, the overhang portion 321B is accommodated in the overhang groove recess 262, and both are complementarily engaged, and the electrode structure 2B and the connector are Connection with 3B is maintained. Therefore, for example, as shown in FIGS. 2 and 3, while the excavation propulsion machine 4 is operated to propel the electrode structure 2 </ b> B in the excavation direction X <b> 1, When encountering bedrock or obstacles, the electrode structure 2B is rotated in the direction opposite to the rotation direction during excavation propulsion, and the electrode structure 2B is retracted in the direction opposite to the excavation direction X1 and It can be recovered. Since the electrode structure 2B collected in this way can be reused, it is economical without being wasted.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the connector 3B shown in FIG. 12, the protruding portion 321B of the engaging portion 32 protrudes from both ends of the projection body 321A in both directions around the axial direction of the connector 3B, Although a pair is formed on the outer side, a connecting tool 3C shown in FIG. 15 may protrude from the tip end portion of the projection main body 321A only in one direction around the axial direction of the connecting tool 3C.

  In addition, the portions of only the one embodiment described above can be used with each other as appropriate without departing from the spirit of the present invention. For example, the protrusion 224 as the engaging portion of the electrode structure 2A shown in FIG. 11 is a protrusion 321 having a protrusion main body 321A and a protruding portion 321B as shown in FIG. 12 or FIG. The receiving groove 36 that is the engaging portion of the extending connecting member 31D shown in FIG. 13 may be a receiving groove 26A having a groove concave portion 261 and an overhang groove concave portion 262 as shown in FIG.

1, 1A Electrode structure installation unit 2, 2A, 2B Electrode structure 21 Electrode 22 Electrode protection member 221 Small diameter portion 222 Taper portion 223 Large diameter portion 224 Protrusion (engagement portion)
225 Groove (engagement part)
230 Excavation blade arrangement portion 23 Excavation blade 24 Backfill 25 Outer cylinder 26, 26A Receiving groove (engagement portion)
261 Groove recess 262 Overhang groove recess 27 Lead wire 28 Conduit 29 Partition member 3, 3A, 3B, 3C Connection tool 31 Connection member 31A Basic connection member 31B, 31C, 31D Extension connection member 32, 32A, 32B, 32C Electrode Engaging portion for connection with structure 321 Protrusion 321A Protrusion main body 321B Overhang portion 322 Groove portion 33 Output shaft connection portion 34 Lead wire accommodating portion 341, 342 Flange portion 343 Lead wire insertion portion 35 Engagement for connection with basic connection member Part 36 Receiving groove (engagement part)
37 Locking tool insertion hole 4 Excavation propulsion machine 41 Rotation drive part 42 Grasping part 43 Support part 5 Reaction force receiving member 51 Body part 52 Rod 53 Stone bump 54 Bracket 55 Pin 56 Anchor 10 DC power supply device 100 Soil 100S Ground 101 Underground Metal body 102 Concrete structure 102S Steel

Claims (13)

An electrode structure installation unit for installing an electrode structure that is connected to a DC power supply and supplies an anticorrosion current to an underground metal body at a predetermined depth from the ground,
The electrode structure having a long shape in one direction, and an excavation propulsion unit that is detachably connected to one end in the longitudinal direction of the electrode structure via a connector and rotates the electrode structure about its longitudinal direction. Equipped with a machine,
With the other end in the longitudinal direction of the electrode structure being in contact with the ground and the gripping portion provided on the excavation propulsion unit being gripped with fingers, the excavation propulsion unit is operated to rotate the electrode structure around the axial direction. An electrode structure installation unit configured to be capable of excavating and propelling the electrode structure into the ground by rotating the electrode structure.   The electrode structure includes an electrode and an electrode protection member including the electrode, and excavation blades are intermittently disposed on an outer surface of the electrode protection member in a longitudinal direction of the electrode protection member. The electrode structure installation unit described in 1. The excavation blades are arranged over three-fifths or more of the total length of the electrode protection member in the longitudinal direction;
The pitch in the longitudinal direction of the excavation blades is substantially equal to the maximum diameter of the arrangement portion of the excavation blades in the electrode protection member, and the protrusion length of the excavation blade from the outer surface of the electrode protection member is the maximum diameter. The electrode structure installation unit according to claim 2, wherein the electrode structure installation unit is shorter than one third. The electrode structure has one end connected to the electrode and the other end from said electrode structure installed unit is connected to the DC power supply apparatus separate, comprises a lead wire, the lead wire, the DC The connection end side with the power supply device is exposed to the outside of the electrode protection member,
The electrode structure installation unit according to claim 2 or 3, wherein a lead wire housing portion around which the exposed lead wire is wound is provided on an outer surface of the connector.   The electrode structure has an engaging part used for connection with the connector, and the connector has an engaging part that complementarily engages with the electrode structure. The electrode structure according to any one of claims 1 to 4, wherein the electrode structure and the connector are detachably connected by complementary engagement between both engaging portions. Installation unit. One of the engagement portion of the electrode structure and the engagement portion of the connector has a protrusion provided at one end in the axial direction of the electrode structure or the connector and protruding outward in the axial direction, Is provided at one end in the axial direction of the connector or the electrode structure, and has a receiving groove into which the protrusion can be inserted,
The projection has a projection body extending in the axial direction, and an overhanging portion projecting around the axial direction from the tip of the projection body,
The receiving groove includes a groove recess that extends inward in the axial direction from the insertion port of the protrusion, and an overhang groove that protrudes from the groove recess in the axial direction at a position spaced apart from the insertion port by a predetermined distance in the axial direction. Having a recess,
After the protrusion is inserted into the receiving groove, the protruding groove is accommodated in the protruding groove recess by rotating the receiving groove or the protrusion in one direction around the axial direction, and the protrusion and the receiving groove Are engaged with each other in a complementary manner, and the engagement state is released by rotating the receiving groove or the projection in a direction opposite to the one direction from the engagement state of both. The electrode structure installation unit according to claim 5.   The connector includes a basic connection member connected to the excavator and an extension connection member that is connected between the basic connection member and the electrode structure and extends the connection tool. The electrode structure installation unit according to any one of claims 1 to 6, wherein the plurality of connecting members are detachably connected to each other in series. Furthermore, it comprises a reaction force receiving member that reduces the reaction force acting on the gripping part when the electrode structure is excavating and propagating in the ground,
The reaction force receiving member has a shape that is long in one direction, is configured to be stretchable in the longitudinal direction, and has one end in the longitudinal direction connected to the coupling tool or the excavator and the other end in the longitudinal direction. The electrode structure installation unit according to claim 1, wherein the electrode structure installation unit is used in contact with the ground. An electrode structure that is connected to a DC power supply and supplies an anticorrosion current to a buried underground metal body at a predetermined depth from the ground, and an electrode structure that is long in one direction, and an axial direction that is the longitudinal direction of the electrode structure A connecting tool for connecting a drilling propulsion machine that rotates around,
A connecting member having a long shape in one direction is provided, and at one end in the longitudinal direction of the connecting member, an engaging portion used for connection with the electrode structure is provided,
A connector provided with a lead wire housing portion around which a lead wire extending from the electrode structure is wound around the outer surface of the connecting member. On the outer surface of the connecting member, a plurality of flange portions are formed protruding at predetermined intervals in the longitudinal direction of the connecting member, and a portion sandwiched between the plurality of flange portions is the lead wire accommodating portion,
Among the plurality of flange portions, a lead wire insertion portion used for passing the lead wire from the electrode structure side to the lead wire housing portion side is formed in the flange portion closest to the electrode structure. The connector according to claim 9.   The connector includes, as the connection member, a basic connection member connected to the excavator and an extension connection member that is connected between the basic connection member and the electrode structure and extends the connection tool. The connecting device according to claim 9 or 10, wherein the plurality of connecting members are detachably connected in series with each other. It is an electrocorrosion construction method of underground metal body using the electrode structure installation unit according to any one of claims 1 to 8,
The excavation propulsion unit is operated in a state in which one end of the electrode structure in the longitudinal direction opposite to the connector side is in contact with the ground and the grasping portion provided in the excavation propulsion unit is grasped with fingers. A propulsion step of excavating and propelling the electrode structure from the ground to a predetermined depth by rotating the electrode structure around an axial direction that is the longitudinal direction thereof;
A connection releasing step of releasing the connection between the electrode structure and the connector, lifting the connector from the ground, and leaving the electrode structure in the ground;
Electrical corrosion protection of underground metal body having an electrical circuit forming step of electrically connecting the electrode structure left in the ground and a DC power supply device installed on the ground via lead wires Law. In the disconnection step, the excavator is operated to rotate the connector in a direction opposite to the rotation direction of the electrode structure in the propulsion step, whereby the electrode structure and the connector are The cathodic protection method for underground metal bodies according to claim 12, wherein the connection is released.

Images