JP6582135B2 - Rebar break detection device for utility poles - Google Patents

Description

  The present invention relates to a reinforcing bar rupture detection device for electric poles, and more particularly to a reinforcing rod rupture detection device for electric poles that can detect a reinforcing bar rupture from a structure in which the reinforcing bars are embedded inside a concrete electric pole or the like.

  In general, most of the supports used in the distribution line are concrete poles and have a prestressed (PS) concrete structure. P. When the S concrete utility pole is used for a long time, there is an accident that the concrete collapses due to the breakage of the reinforcing bars inside the utility pole.

  P. Since the S concrete structure is designed to support the bending moment with the tensile force of the reinforcing bar, if the reinforcing bar inside the utility pole breaks and loses the tensile force, an accident occurs in which the concrete utility pole collapses.

  Recently, when an operator cuts a cable connected to a utility pole in order to replace a concrete utility pole, there is a case in which a safety accident occurs due to a sudden collapse of the utility pole due to the balance of force.

  P. In South Korea, which uses S-concrete utility poles, various devices such as transformers and switches are installed on the utility poles, so the risk of accidents due to breakage of the reinforcing bars inside the concrete is very high. Therefore, it is necessary to diagnose that the reinforcing bar in the concrete breaks and replace or reinforce the utility pole before a collapse accident occurs.

  As a related prior patent, Korean Published Patent No. 10-2014-0042240 (published on April 7, 2014) is available.

  However, the prior patent is a method for diagnosing a broken part of a reinforcing bar in a concrete utility pole using a sensor that is one of the functions of a smartphone. Then, there is a problem that it is difficult to diagnose rebar breaking.

  That is, as shown in FIG. 1a, when a rebar break P occurs at the top of the ground surface 2 of the concrete power pole 1, it is possible to detect the presence or absence of the rebar break by bringing the sensor into contact with the concrete power pole 1 as shown in FIG. 1b. As described above, when the reinforcing bar break P occurs in the lower part of the ground surface 2 of the concrete utility pole 1, the sensor cannot be contacted and the reinforcing bar break cannot be detected.

  In addition, prior patents not only have to place sensors sequentially along the circumference on the outer surface of the utility pole to inspect multiple rebars, but also move up and down to inspect the rebar in the length direction However, since the rebar breaking state must be inspected, there is a problem that considerable work time is required because workability is low.

Korean Published Patent No. 10-2014-0042240

  Therefore, the object of the present invention is to detect a magnetic field from a reinforcing bar while moving along the length of the reinforcing bar inside the utility pole from a structure in which the reinforcing bar is embedded inside a concrete electric pole, etc. An object of the present invention is to provide an electric pole rebar break detecting device that can detect whether or not a lower rebar is broken and can simultaneously detect a plurality of rebar broken states.

  According to the characteristics of the present invention for achieving the above object, the present invention is inserted into the internal space of the power pole through a hole provided on one side of the power pole and moves in contact with the inner surface of the power pole. However, a detection unit for detecting a magnetic field of a reinforcing bar embedded in the utility pole, a data logger for receiving and storing magnetic field data applied to the reinforcing bar detected by the detection unit, and magnetic field data stored in the data logger And a rupture state detection unit that detects a rupture state of the reinforcing bar based on the amount of change in the magnetic field.

  The detection unit is formed in a flexible rope shape, and a support part inserted into the internal space of the utility pole through the hole of the utility pole, and a plurality of foldable units that are radially coupled to one end of the support part and can be folded. A support arm unit, and a magnetic field detection unit that is installed on one side of the support arm unit and that detects a magnetic field generated from a reinforcing bar embedded in the utility pole in contact with the inner surface of the utility pole. .

  The plurality of support arm portions have a bar shape, and are formed such that an upper end is coupled to one end of the support portion and a lower end is curved toward the inner surface of the utility pole, and has elasticity toward the inner surface of the utility pole. The magnetic field detector may be in contact with the inner surface of the utility pole.

  The plurality of support arm portions have a bar shape, and upper ends thereof are coupled to one end of the support portion, and lower ends thereof are spread toward the inner surface of the utility pole by operating means to bring the magnetic field detection unit into contact with the inner surface of the utility pole. It may be.

  The actuating means includes a folding arm for connecting the plurality of support arm portions, one end connected to the center of the folding arm and the other end exposed to the outside of the power pole via the support portion, and the outside of the power pole. And an actuating part that moves the center of the folding arm upward by an action of pulling it upward to widen the lower end of the support arm part toward the inner surface of the utility pole.

  The plurality of support arm portions have a bar shape, an upper end is coupled to one end of the support portion, and an intermediate portion is expanded toward the inner surface of the utility pole by an operating unit to bring the magnetic field detection unit into contact with the inner surface of the utility pole. It may be a thing.

  The actuating means includes a shaft extending downward from the support portion, a lower end of the plurality of support arm portions, a movable block fixedly coupled to the shaft, one end coupled to the movable block and the other end May be disposed outside the utility pole, and may include an operating unit that moves the moving block on the axis.

  Since the present invention can detect the magnetic field generated from the reinforcing bar while moving inside the utility pole along the length direction of the reinforcing rod embedded in the utility pole, the lower end of the utility pole embedded in the lower part of the ground surface There is an effect that the broken state of the reinforcing bar corresponding to the part can be easily detected.

  In addition, the present invention is composed of a plurality of support arm portions combined with a magnetic field detection unit radially connected to one end of the support unit, and the magnetic field detection unit is brought into close contact with the inner surface of the utility pole. There is an effect that they can be detected simultaneously.

It is a figure which shows the reinforcing bar fracture example with respect to the upper part of the ground surface of a concrete electric pole. It is a figure which shows the reinforcing bar fracture example with respect to the lower part of the ground surface of a concrete electric pole. It is a figure which shows the reinforcing bar fracture | rupture detection apparatus for utility poles which concerns on one Embodiment of this invention. It is a figure which shows the method of inserting the reinforcing bar break detection apparatus for electric poles which concerns on one Embodiment of this invention into the internal space of a concrete electric pole, and detecting a reinforcing bar break. It is a figure which shows the method of inserting the reinforcing bar break detection apparatus for electric poles which concerns on one Embodiment of this invention into the internal space of a concrete electric pole, and detecting a reinforcing bar break. It is a graph which shows the magnetic field data with respect to the some rebar which detected the magnetic field using FIG. It is a figure which shows the reinforcing bar fracture | rupture detection apparatus for utility poles which concerns on other embodiment of this invention. It is a figure which shows the method of inserting the reinforcing bar breakage detection apparatus for utility poles which concerns on other embodiment of this invention in the interior space of a concrete utility pole, and detecting a reinforcement breakage. It is a figure which shows the reinforcing bar fracture | rupture detection apparatus for utility poles which concerns on another embodiment of this invention. It is a figure which shows the method of inserting the reinforcing bar breakage detection apparatus for utility poles which concerns on another embodiment of this invention in the interior space of a concrete utility pole, and detecting a reinforcement breakage.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 2, the utility pole rebar break detection device according to an embodiment of the present invention includes a detection unit 10, a data logger 20, and a breakage state detection unit 30.

  The detection unit 10 is inserted into the internal space 5 of the utility pole 1 through a hole 3 provided on one side of the concrete utility pole 1 and moves in contact with the inner surface of the utility pole 1 while being embedded in the utility pole 1. 7 and 9 magnetic fields are detected.

  Inside the utility pole 1, usually 16 reinforcing bars 7 and 9 are embedded in a circular shape at regular intervals. The length of the reinforcing bars 7 and 9 embedded in the inside of the utility pole 1 is about 2.5 m (in the case of a 16 m utility pole) from the ground surface to the bottom.

  In the case as described above, the reinforcing bar 7 is inserted into the internal space 5 of the utility pole 1 through the hole 3 provided on one side of the utility pole 1 and is embedded in the ground of the utility pole 1 inside the utility pole 1. , 9 breakage states can be detected, and a plurality of rebar breakage states can also be detected simultaneously.

  The hole 3 may be a hole to which the scaffolding support pin of the utility pole 1 is coupled. The hole 3 to which the scaffolding support pin is coupled is provided in advance in the utility pole, and it is not necessary to provide another hole for inserting the detection unit 10 in the utility pole 1, so that the state of the rebar breakage can be achieved by minimal drilling. Can be detected.

  The detection unit 10 includes a support part 11, a support arm part 13, and a magnetic field detection part 15.

  The support portion 11 has a flexible rope shape and can be formed by being wound in a coil shape. The support part 11 is inserted through the hole 3 of the utility pole 1 and plays a role of arranging the support arm part 13 and the magnetic field detection part 15 in the internal space 5 of the utility pole 1.

  The support portion 11 has a part at the other end arranged outside the utility pole 1 so that the operator can operate the support arm portion 13 by gripping it.

  The support arm 13 is composed of a plurality of support arms 11 that are radially coupled to one end of the support 11 and can be folded. That is, a plurality of support arm portions 13 are radially coupled to one end of the support portion 11 so that magnetic fields from a plurality of reinforcing bars can be detected simultaneously. The number of support arm portions 13 preferably corresponds to the number of reinforcing bars embedded in the utility pole 1.

  The support arm portion 13 has a bar shape, and is formed such that the upper end is coupled to one end of the support portion 11 and the lower end is curved toward the inner surface of the utility pole. The support arm unit 13 brings the magnetic field detection unit 15 into contact with the inner surface of the utility pole with elasticity in the inner surface direction of the utility pole.

  The magnetic field detection unit 15 is installed on one side of the support arm unit 13, contacts the inner surface of the utility pole 1, and detects a magnetic field generated from the reinforcing bars 7 and 9 embedded in the utility pole 1. In one embodiment, the magnetic field detection unit 15 is installed at the lower end of the support arm unit 13, and detects the magnetic field from the reinforcing bars 7 and 9 while being in contact with the inner surface of the utility pole due to the elasticity of the support arm unit 13.

  The magnetic field detection unit 15 detects the magnetic field of the reinforcing bars 7 and 9 while moving in the length direction of the reinforcing bars 7 and 9 by the operation of pulling the support unit 11 upward while being in contact with the inner surface of the utility pole 1.

  The magnetic field detection unit 15 can be formed in a spherical shape in order to facilitate movement while being in contact with the inner surface of the utility pole 1. The magnetic field detection unit 15 may be a magnetic sensor that measures a magnetic field that is a current generated from the reinforcing bars 7 and 9 by an electromagnetic induction phenomenon.

  The data logger 20 and the breakage state detection unit 30 are disposed outside the utility pole.

  The data logger 20 receives and stores magnetic field data applied to the reinforcing bars 7 and 9 detected by the detection unit 10. The data logger 20 is electrically connected to the detection unit 10 and substantially receives and stores magnetic field data applied to the reinforcing bars 7 and 9 detected by the magnetic field detection unit 15 of the detection unit 10.

  The rupture state detection unit 30 detects the rupture state of the reinforcing bars based on the amount of change in the magnetic field of the reinforcing bars 7 and 9 detected by the magnetic field detection unit 15. Specifically, the breakage state detection unit 30 is electrically connected to the data logger 20, can receive the magnetic field data stored in the data logger 20, and the magnetic field of the magnetic field data stored in the data logger 20. The fracture state of the reinforcing bar is detected on the basis of the amount of change.

  Hereinafter, the operation of the embodiment will be described.

  As shown in FIG. 3, the detection unit 10 is inserted through the hole 3 of the utility pole 1 so that the support part 11, the support arm part 13 and the magnetic field detection part 15 are arranged in the internal space 5 of the utility pole 1. .

  For this reason, the operator holds the plurality of support arm portions 13 by hand and folds them, and then the inside of the utility pole 1 through the holes 3 to which the scaffold support pins provided on one side of the utility pole 1 are coupled. Insert into space 5.

  The plurality of support arm portions 13 have their lower ends spread toward the inner surface of the utility pole due to elasticity in the process of being inserted into the internal space 5 of the utility pole 1. Therefore, the magnetic field detection unit 15 coupled to the lower end of each support arm unit 13 contacts the inner surface of the utility pole 1.

  At this time, since the plurality of support arm portions 13 are radially coupled to one end of the support portion 11, the lower end of each support arm portion 13 extends in the circumferential direction on the inner surface of the utility pole 1 and is coupled to each support arm portion 13. The magnetic field detection unit 15 can be supported on the inner surface of the utility pole 1 in the circumferential direction.

  In this state, the magnetic field can be detected simultaneously from the plurality of reinforcing bars 7 and 9 embedded in the utility pole 1.

  After that, as shown in FIG. 4, the magnetic field is detected while pulling the support portion 11 disposed outside the utility pole 1 and moving the support arm portion 13 upward.

  That is, when the support arm unit 13 moves upward, the magnetic field detection unit 15 coupled to the lower end of each support arm unit 13 moves upward while being in contact with the inner surface of the utility pole 1. The magnetic field can be detected along the length direction of the reinforcing bars 7 and 9.

  The magnetic field data for the reinforcing bars 7 and 9 detected by the magnetic field detector 15 is stored in the data logger 20.

  Further, the breakage state detection unit 30 detects the amount of change of the magnetic field with respect to each of the reinforcing bars 7 and 9 based on the magnetic field data stored in the data logger 20, and based on the detected amount of change of the magnetic field of the reinforcing bars 7 and 9. Detect break condition.

  FIG. 5 shows magnetic field data for a plurality of reinforcing bars in which a magnetic field is detected by applying an embodiment of the present invention.

  As shown in FIG. 5, a portion where the amount of change in the magnetic field is abrupt is confirmed. It is detected that the rebar is in a broken state at a portion where the amount of change in the magnetic field is abrupt.

  When one embodiment is applied, a broken reinforcing bar can be detected from a plurality of reinforcing bars, and a broken position can also be detected accurately. That is, it is possible to easily detect the broken state of the reinforcing bar at a position corresponding to the lower end portion of the utility pole embedded in the ground.

  Hereinafter, other embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  In a pole rebar break detection device for a utility pole according to another embodiment of the present invention, the shape of the detection unit 40 is different from that of the embodiment. Since the data logger 20 and the breakage state detection unit 30 have the same configuration and operation as those of the embodiment of the present invention, detailed description thereof is omitted.

  As shown in FIG. 6, the detection unit 40 includes a support part 41, a support arm part 43, and a magnetic field detection part 45.

  As shown in FIG. 7, the support portion 41 has a flexible rope shape and can be formed by being wound in a coil shape. The support part 41 is inserted through the hole 3 of the utility pole 1 and plays a role of arranging the support arm part 43 and the electric field detection part 45 in the internal space 5 of the utility pole 1.

  A part of the other end of the support part 41 is disposed outside the utility pole 1 so that the operator can operate the support arm part 43 by gripping it.

  The support arm portion 43 is composed of a plurality of support arms 41 that are radially coupled to one end of the support portion 41 and can be folded. The plurality of support arm portions 43 have a bar shape, the upper end is coupled to one end of the support portion 41, and the lower end is spread toward the inner surface of the utility pole 1 by the operating means 51 to contact the magnetic field detection unit 45 with the inner surface of the utility pole 1. Let

  The magnetic field detection unit 45 is formed in a spherical shape in order to facilitate vertical movement while being in contact with the inner surface of the utility pole.

  The actuating means 51 includes a folding arm 53 and an actuating portion 57.

  The folding arm 53 connects the plurality of support arm portions 43. Specifically, the folding arm 53 connects the plurality of support arm portions 43 on the same distance.

  The operating portion 57 causes the lower end of the support arm portion 43 to expand toward the inner surface of the utility pole 1 by the operation of pulling the central portion of the folding arm 53 upward.

  One end of the operating portion 57 is connected to the center of the folding arm 53, and the other end is exposed to the outside of the utility pole via the support portion 41. When the other end of the operating portion 57 is pulled in the outer direction of the utility pole 1, the lower end of the support arm portion 43 can be expanded toward the inner surface of the utility pole 1 while the central portion of the folding arm 53 moves upward.

  The operating portion 57 provides power for moving the central portion of the folding arm 53 in the vertical direction while moving above or below the utility pole 1 and is thus formed into a rigid string like a steel cable. It is preferable.

  When the lower end of each support arm portion 43 extends toward the inner surface of the utility pole 1, the magnetic field detection unit 45 coupled to the lower end of the support arm portion 43 comes into contact with the inner surface of the utility pole 1.

  A shape holding portion 55 is further provided in the center of the folding arm 53. In effect, one end of the actuating portion 57 is connected to the shape holding portion 55. When the shape holding part 55 is pulled upward, the shape holding part 55 plays a role of pushing the inner side of the support arm part 43 toward the inner surface of the utility pole 1 and radially expanding the lower end of the support arm part 43.

  Hereinafter, the operation of other embodiments will be described.

  As shown in FIG. 7, the detection unit 40 is inserted through the hole 3 of the utility pole 1, and the support part 41, the support arm part 43, and the electric field detection part 45 are arranged in the internal space 5 of the utility pole 1.

  For this reason, the operator pushes the operating portion 57 downward to fold the plurality of support arm portions 43, and then folds the support arm portions 43 through the holes 3 to which the scaffold support pins provided on one side of the utility pole 1 are coupled. And inserted into the internal space 5 of the utility pole 1.

  When the support arm 43 is inserted into the internal space 5 of the utility pole 1 in a folded state, the operating portion 57 is pulled above the utility pole 1 and the central portion of the folding arm 53, that is, the shape holding portion 55 is pulled upward. Like that.

  When the shape holding part 55 is pulled upward, the lower end of the support arm part 43 spreads radially while the inner side of the support arm part 43 is pushed and moved toward the inner surface of the utility pole 1. Thereby, the magnetic field detection unit 45 coupled to the lower end of the support arm unit 43 easily comes into close contact with the inner surface of the utility pole 1.

  In this state, the magnetic field can be detected simultaneously from the plurality of reinforcing bars 7 and 9 embedded in the utility pole 1.

  Thereafter, the magnetic field can be detected while pulling the support portion 41 disposed outside the utility pole 1 and moving the support arm portion 43 upward.

  That is, when the support arm unit 43 moves upward, the magnetic field detection unit 45 coupled to the lower end of each support arm unit 43 moves upward in close contact with the inner surface of the utility pole 1. The magnetic field to be detected can be detected along the length direction of the reinforcing bars 7 and 9.

  Hereinafter, another embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  In a pole rebar break detection device for a utility pole according to another embodiment of the present invention, the shape of the detection unit 60 is different from that of one embodiment and other embodiments. Since the data logger 20 and the breakage state detection unit 30 have the same configuration and operation as those of the embodiment of the present invention, detailed description thereof is omitted.

  As shown in FIG. 8, the detection unit 60 includes a support part 61, a support arm part 63, and an electric field detection part 65.

  As shown in FIG. 9, the support part 61 has a flexible rope shape, and can be formed by being wound in a coil shape. The support part 61 is inserted through the hole 3 of the utility pole 1 and plays a role of arranging the support arm part 63 and the electric field detection part 65 in the internal space 5 of the utility pole 1.

  The support portion 61 has a part at the other end arranged outside the utility pole 1 so that the operator can operate the support arm portion 63 by gripping it.

  The support arm part 63 is composed of a plurality of support parts 61 that are radially coupled to one end of the support part 61 and can be folded. The plurality of support arm portions 63 have a bar shape, the upper ends are coupled to one ends of the support portions 61, and the intermediate portions are spread in the direction of the inner surface of the utility pole 1 by the actuating means 71, so Make contact.

  The magnetic field detection unit 65 is coupled to an intermediate portion of the support arm unit 63. The magnetic field detector 65 is preferably formed in a spherical shape in order to facilitate vertical movement while being in contact with the inner surface of the utility pole 1.

  The operating means 71 includes a shaft 73, a moving block 75 and an operating part 77.

  The shaft 73 extends downward from one end of the support portion 61. The moving block 75 is fixed to the lower ends of the plurality of support arm portions 63 and is movably coupled to the shaft 73. The shaft 73 is formed in a cylindrical shape, and the moving block 75 can be formed in a cylindrical shape having a passage hole through which the shaft 73 passes in the center.

  The operating unit 77 has one end coupled to the moving block 75 and the other end disposed outside the utility pole 1. The operating unit 77 plays a role of moving the moving block 75 on the shaft 73.

  The operating portion 77 provides power for moving the moving block 75 in the vertical direction on the shaft 73 while moving above the electric pole 1 or below the electric pole 1, so that it is formed in a rigid string like a steel cable. It is preferable to do.

  The support arm part 63 has an upper end fixed to one end of the support part 61 and a lower end fixed to the moving block 75. Thereby, the support arm part 63 can be made to expand, curving an intermediate part in the inner surface direction of the utility pole 1, if the movement block 75 is moved upward on the axis | shaft 73. FIG.

  When the intermediate portion of each support arm portion 63 spreads while curving toward the inner surface of the utility pole 1, the magnetic field detection unit 65 coupled to the intermediate portion of the support arm portion 63 can come into close contact with the inner surface of the utility pole 1.

  Hereinafter, the operation of another embodiment will be described.

  As shown in FIG. 9, the detection unit 60 is inserted through the hole 3 of the electric pole 1, and the support portion 61, the support arm portion 63, and the electric field detection portion 65 are arranged in the internal space 5 of the electric pole 1.

  For this reason, the operator pushes the operating portion 77 downward to fold the plurality of support arm portions 63 and then connects the utility pole 1 through the hole 3 to which the scaffold support pin provided on one side of the utility pole 1 is coupled. It can be easily inserted into the internal space 5.

  The support arm 63 is inserted into the inner space 5 of the utility pole 1 in a folded state, and the operating part 77 is pulled above the utility pole 1. Then, when the moving block 75 that fixes the lower end of the support arm portion 63 moves upward, the intermediate portion of the support arm portion 63 spreads so as to bend toward the inner surface of the utility pole. Thereby, the magnetic field detection part 65 couple | bonded with the intermediate part of the support arm part 63 can contact | adhere to the inner surface of a utility pole easily.

  In this state, the magnetic field can be detected simultaneously from the plurality of reinforcing bars 7 and 9 embedded in the utility pole 1.

  Thereafter, the magnetic field generated from the reinforcing bars 7 and 9 can be detected while pulling the support portion 61 disposed outside the utility pole 1 and moving the support arm portion 63 upward.

  That is, when the support arm 63 moves upward, the magnetic field detector 65 coupled to the lower end of each support arm 63 moves upward in close contact with the inner surface of the utility pole 1. The magnetic field to be detected can be detected along the length direction of the reinforcing bars 7 and 9.

  The electric pole rebar break detecting device of the present invention described above detects a magnetic field generated from a reinforcing bar while moving along the length direction of the reinforcing bars 7 and 9 embedded in the electric pole 1 inside the electric pole 1. Therefore, the broken state of the reinforcing bar corresponding to the lower end portion of the utility pole embedded in the ground can be detected.

  In addition, since the support arm unit coupled to the magnetic field detection unit is composed of a plurality of units that are radially coupled to one end of the support unit, a plurality of rebar breaking states can be detected simultaneously.

  The scope of the right of the present invention is not limited to the above-described embodiment, but is defined by what is described in the claims, and the right described in the claims by a person having ordinary knowledge in the technical field of the present invention. Obviously, various modifications and alterations can be made within the scope.

Claims (6)

A detection unit that detects a magnetic field of a reinforcing bar embedded in the power pole while being inserted into an internal space of the power pole through a hole provided on one side of the power pole and moving in contact with the inner surface of the power pole;
A data logger that receives and stores magnetic field data applied to the reinforcing bars detected by the detection unit;
Look including a rupture state detecting unit for detecting the rupture state of the reinforcing bar on the basis of the variation of the magnetic field of the magnetic field data stored in the data logger,
The detection unit is
A support portion that is formed in a flexible rope shape and is inserted into the internal space of the utility pole through the hole of the utility pole;
A plurality of support arm portions radially coupled to one end of the support portion and capable of being folded;
A reinforcing bar break for a utility pole , comprising: a magnetic field detecting part installed on one side of the support arm part and detecting a magnetic field generated from a reinforcing bar embedded in the utility pole in contact with an inner surface of the utility pole Detection device. The plurality of support arm portions are bar-shaped,
An upper end is formed to be coupled to one end of the support part and a lower end is curved toward the inner surface of the utility pole,
The reinforcing bar breakage detecting device for a utility pole according to claim 1 , wherein the magnetic field detector is brought into contact with the inner surface of the utility pole with elasticity in an inner face direction of the utility pole. The plurality of support arm portions are bar-shaped,
2. The electric pole according to claim 1 , wherein an upper end is coupled to one end of the support portion, and a lower end is spread toward an inner surface of the electric pole by an operating unit to bring the magnetic field detection unit into contact with the inner surface of the electric pole. Rebar break detection device. The operating means is
A folding arm connecting the plurality of support arm parts;
One end is connected to the center of the folding arm, and the other end is exposed to the outside of the power pole through the support, and the center of the folding arm is moved upward by a pulling operation to the outside of the power pole. The rebar breakage detecting device for a utility pole according to claim 3 , further comprising an operating part that expands a lower end of the part toward the inner surface of the utility pole. The plurality of support arm portions are bar-shaped,
2. The utility pole according to claim 1 , wherein an upper end is coupled to one end of the support part, and an intermediate part is spread in an inner surface direction of the utility pole by an operating unit to bring the magnetic field detection unit into contact with the inner face of the utility pole. Reinforcing bar break detection device. The operating means is
An axis extending downward from the support,
A lower end of the plurality of support arm portions is fixed, and a moving block movably coupled to the shaft;
The reinforcing bar for an electric pole according to claim 5 , further comprising an operating part having one end coupled to the moving block and the other end arranged outside the electric pole and moving the moving block on the axis. Break detection device.

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