JP6078825B2 - Rebar detector - Google Patents

Description

  The present invention relates to a reinforcing bar detection device that detects whether or not a reinforcing bar is exposed in a hole drilled in a reinforced concrete structure in order to insert a shear reinforcing bar or an anchor bolt.

  A shear reinforcement method is known in which a hole is drilled in an existing reinforced concrete structure and a shear reinforcement is inserted when performing seismic reinforcement of a reinforced concrete box culvert wall or floor slab, or a pier or column ( (See Patent Documents 1 and 2).

  In carrying out these shear reinforcement methods, it is necessary to first confirm the position of the reinforcing bar embedded in the concrete and drill it so as not to damage the reinforcing bar.

  Thus, various nondestructive inspection methods are known as a method of confirming the position of the reinforcing bar embed | buried in the existing reinforced concrete structure (refer patent documents 3-5 etc.).

  For example, Patent Document 1 discloses an electromagnetic exploration method for detecting the presence of a reinforcing bar by generating an electromagnetic wave using a transmission coil, causing the electromagnetic wave to enter concrete, and receiving the reflected wave by a reception coil. ing.

  In Patent Document 1, a magnetic exploration method is combined with an electromagnetic exploration method in order to accurately detect the position of a reinforcing bar. The magnetic exploration method is a method of measuring the position of a reinforcing bar by generating and transmitting a magnetic field by a coil incorporated in a sensor and observing the magnetic field intensity generated by electromagnetic induction from the reinforcing bar. The metal object recognition method of Patent Document 4 is also based on this magnetic exploration method.

  On the other hand, Patent Document 5 discloses a nondestructive inspection method for concrete using microwaves. In this method, microwaves are irradiated from the surface of the concrete structure to increase the internal temperature, and the temperature distribution is measured to detect the position or shape of the internal cavity or the reinforcing bar.

Japanese Patent No. 3932094 Japanese Patent No. 3829081 JP 2003-315004 A JP 2011-69667 A JP 2007-1332739 A

  However, it is still difficult to accurately identify the position of the reinforcing bar embedded in the reinforced concrete structure by nondestructive inspection such as electromagnetic exploration or magnetic exploration. Even if the detection accuracy is improved, there is a possibility that the reinforcing bars will be damaged if the arrangement of the bars is performed at a high density or if the drilling cannot be performed at an accurate position.

  For this reason, it is ideal to be able to confirm whether or not the reinforcing bar damaged by the drilling machine is exposed on the wall surface of the hole with respect to the actually drilled hole. On the other hand, many holes drilled in reinforced concrete structures are very narrow (having a small hole diameter), and the measuring instruments that can be inserted are also limited.

  Further, with the measurement accuracy by the electromagnetic exploration method or the magnetic exploration method as described above, it is impossible to determine a state where the reinforcing bar is located very close to the hole wall but not exposed.

  Therefore, an object of the present invention is to provide a reinforcing bar detection device that can be inserted even when the hole is narrow and can reliably detect a state to be confirmed.

  In order to achieve the above object, the reinforcing bar detection apparatus of the present invention is a reinforcing bar detection apparatus that detects a reinforcing bar inserted into a hole drilled in a reinforced concrete structure, and is capable of detecting the entire length of the hole. A shaft portion formed on the shaft portion, a detection portion provided at a tip of the shaft portion, and an output portion that outputs information obtained by the detection portion as a detection signal, and the detection portion is provided on a wall surface of the hole. It has at least one set of positive and negative conductive contacts arranged so as to be in contact with each other, and a detection signal is output to the output unit when a current exceeding a threshold value flows between the positive and negative contacts. It is characterized by that.

  Here, an insulator may be interposed between the positive and negative contacts. In addition, the output unit includes a notification unit provided at the rear end of the shaft portion, and can be configured such that notification by the notification unit is performed when the detection signal is output.

  Further, the shaft portion may be provided with a scale portion for measuring the length inserted into the hole. Moreover, the said contactor can be formed with the flexible face material which spreads in the axis orthogonal direction of the said axial part.

  The contact may be attached to the tip of the shaft portion that is elastically openable and closable. Furthermore, the contact may be formed in a needle shape.

  And it is preferable that the said detection signal is output so that the electricity supply position by the said contactor can be identified. In addition, a reset device having an outer shape larger than the hole is mounted on the shaft portion so as to be movable along the axial direction, and the reset device is moved to a switch portion provided at a position adjacent to the detection portion. By doing so, it can be configured to be set to the inspection start state.

  In the reinforcing bar detection device of the present invention configured as described above, the detection unit is provided at the tip of the shaft portion formed to have a length that allows the entire length of the hole to be detected. This detector has a conductive contact, and when a current greater than the threshold flows between the contacts connected to the circuit with a distinction between positive and negative, the rebar is exposed on the wall surface of the hole Etc. are detected.

  Thus, since it is the structure which provides a detection part in the front-end | tip of an axial part, it can be set as the structure which can be inserted even if a hole is narrow. In addition, since it is possible to detect only when there is contact of the contact with the reinforcing bar, it is possible to reliably detect only the state to be confirmed such as detecting only the state where the reinforcing bar is exposed on the wall surface of the hole. .

  Further, if an insulator is interposed between the positive and negative contacts, it can be prevented that the positive and negative contacts are accidentally short-circuited to be in a state equivalent to the detection of a reinforcing bar. Furthermore, if a notification unit that notifies the detection of the reinforcing bar by light or sound is provided at the rear end of the shaft part, the inspector can immediately recognize that the reinforcing bar has been detected. Moreover, if the scale part for measuring the length inserted in the axial part is provided, the position of the depth direction of the hole in which the reinforcing bar was detected can be recognized easily.

  And when forming a contactor with the flexible surface material which spreads in an axial part orthogonal direction, a contactor can be made to contact the wall surface of a hole reliably by bending a surface material. Moreover, if it is the structure which attaches a contact to the front-end | tip of the axial part formed elastically so that opening and closing is possible, a contact can be made to contact the wall surface of a hole with an elastic force. Furthermore, if the contact is formed in a needle shape, the energization position by the contact can be identified by a point.

  Further, if the detection signal is output so that the energization position by the contact can be identified, the position in the circumferential direction of the hole where the reinforcing bar is detected can be specified, and the type of the exposed reinforcing bar can be determined. It becomes like this.

  Further, if the reset device having an outer shape larger than the hole is set close to the detection unit so as to be set in the inspection start state, the inspection of the entire length of the hole can be performed without omission.

It is a figure explaining the structure of the reinforcing bar detection apparatus of embodiment of this invention, Comprising: (a) is a general view, (b) is the elements on larger scale. It is the side view which showed the structure of the whole reinforcing bar detection apparatus. It is explanatory drawing which showed the state at the time of the test | inspection which inserted the reinforcing bar detection apparatus in the hole of the reinforced concrete structure. It is the perspective view which showed the structure of the detection part. It is the front view which showed the structure of the contactor. It is the disassembled perspective view which showed the structure of the detection part which can identify an electricity supply position. It is a figure explaining the structure of an alerting | reporting part, Comprising: (a) is the figure which showed the alerting | reporting state when there was an energization position in the horizontal direction, (b) is the alerting | reporting state when there was an energization position in the vertical direction. FIG. It is a procedure figure explaining the procedure which inspects the hole of a reinforced concrete structure by a reinforcing bar detection device. It is a partial expansion perspective view explaining the structure of the detection part of the reinforcing bar detection apparatus of Example 1. It is a figure explaining the structure of the reinforcing bar detection apparatus of Example 1, Comprising: (a) is a figure explaining the state before inserting a detection part in a hole, (b) demonstrates the state which inserted the detection part in the hole. It is a figure to do. It is explanatory drawing which showed the structure of the reinforcing bar detection apparatus of Example 2. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1-3 is a figure explaining the structure of the reinforcing bar detection apparatus 1 of this Embodiment. This rebar detection device 1 is inserted into a hole H drilled in a reinforced concrete structure R such as a column, wall, or floor slab, and detects whether or not the rebar S is exposed inside the hole.

  Such a hole H is used when a shear reinforcement bar is arranged later to perform seismic reinforcement of the reinforced concrete structure R, or when anchor bolts are driven to fix equipment or equipment to the reinforced concrete structure R. And so on.

  As shown in FIG. 1, the reinforcing bar detection device 1 according to the present embodiment includes a shaft portion 2 formed to have a length that allows the entire length of the hole H to be detected, and a detection portion 3 provided at the tip of the shaft portion 2. And a gripping unit 4 as an output unit that outputs information obtained by the detection unit 3 as a detection signal.

  The shaft portion 2 is mainly composed of a tube portion 21 and a scale portion 22 marked on the outer peripheral surface of the tube portion 21. The scale part 22 is written so that the distance from the detection part 3 can be read.

  Moreover, in the inside of the tube part 21, wiring for connecting the detection part 3 and the holding part 4 is performed so that it may mention later. For this reason, the tube part 21 can be made into a multiple tube structure such as a double tube or a triple tube, if necessary, in order to enhance the insulation between the contacts (between the electrodes).

  On the other hand, as shown in FIG. 1B, the detection unit 3 includes a positive electrode plate 31 as a positive contact, a negative electrode plate 32 as a negative contact, and an insulation plate 33 as an insulator. And has a laminated structure.

  The shape of the contact will be described in more detail with reference to FIG. Here, since the positive electrode plate 31 and the negative electrode plate 32 have the same structure, the positive electrode plate 31 will be described as an example.

  The positive electrode plate 31 is formed in a disk shape whose surface extends in the direction perpendicular to the axis of the shaft portion 2. For example, the outer periphery of the circular central portion 311 can be surrounded by a plurality of fan-shaped fan portions 312.

  The fan portions 312,... Can be formed by inserting slits 313,... At equal intervals in the circumferential direction from the outer edge of a conductive disc such as a metal plate. In addition, the slit 313 can be formed by cutting a length of about half the radius, for example, on the radiation of a disk. Thus, if the outer peripheral part of the positive electrode plate 31 is formed by a plurality of fans 312..., The outer peripheral part can be easily bent.

  On the other hand, a central hole 314 for inserting a tip bolt 36 (see FIG. 6) for assembling the detection unit 3 is provided at the center of the central portion 311. Further, around the center hole 314, wiring holes 315, 316 for inserting wiring lead wires 34, 35A, 35B as shown in FIG. 1 are provided.

  The insulating plate 33 has substantially the same shape as the positive electrode plate 31 except that it is made of an insulating material such as a rubber plate or a vinyl chloride sheet, and a detailed description thereof will be omitted.

  At least one set of the positive electrode plate 31, the negative electrode plate 32, and the insulating plate 33 formed in this way is incorporated in the detection unit 3. The detection unit 3 shown in FIG. 1 has a negative electrode plate 32, an insulating plate 33, a positive electrode plate 31, an insulating plate 33, a negative electrode plate 32, an insulating plate 33, and a positive side as viewed from the shaft 2 side. The electrode plates 31 are stacked in this order. In short, the detection unit 3 includes two sets of positive and negative electrode plates (31, 32). FIG. 4 is a perspective view showing an appearance of the assembled detection unit 3.

  Then, lead wires 34, 35A, and 35B are connected to the positive electrode plate 31 and the negative electrode plate 32, respectively. An example of connection will be described with reference to FIG. 1B. First, two positive electrode plates 31 and 31 are connected to connection points 341A and 341B, respectively, with respect to a lead wire 34 serving as a positive wiring. The

  On the other hand, the negative electrode plate 32 on the shaft portion 2 side is connected to the lead wire 35A serving as the negative wiring at the connection point 351A. Furthermore, another negative electrode plate 32 is connected to the lead wire 35B serving as the negative wiring at the connection point 351B.

  When the rebar S comes into contact with the detection unit 3 in which the positive electrode plate 31 and the negative electrode plate 32 are connected as shown in FIG. 1B, the positive electrode plate is interposed via the rebar S. 31 and the negative electrode plate 32 are short-circuited, and a current flows.

  The lead wires 34, 35 </ b> A, and 35 </ b> B are extended to the grip portion 4 through the inside of the tube portion 21 of the shaft portion 2. When the tube part 21 has a double tube structure, for example, the lead wire 34 is wired to the inner tube side (inside the inner tube), and the lead wires 35A and 35B are connected to the outer tube side (the outer tube and the inner tube). Wiring in the gap).

  As shown in FIG. 1 (a), the gripping unit 4 includes a detection circuit 41 connected to the lead wires 34, 35A, and 35B, a box unit 43 that houses the detection circuit 41, and a notification unit that performs notification. The detection lamp 42 and a power source 46 for driving them are mainly configured.

  The detection circuit 41 is mounted on the substrate 41a and connected to the lead wires 34, 35A, 35B and the detection lamp 42. When a current flows through any one of the lead wires 34, 35A, and 35B, the detection circuit 41 determines the magnitude (or resistance value) of the current, and a detection signal is generated when the measured value exceeds a threshold value. As a result, a current flows through the detection lamp 42.

  In short, even when the positive electrode plate 31 and the negative electrode plate 32 are short-circuited through water or short-circuited by the adjacent reinforcing bar S through a thin concrete film, a small amount of current is detected by the detection circuit 41. Flows into. When a detection signal is generated when all currents including these minute amounts of current are measured, even if the hole H is in a healthy state where the reinforcing bar S is not actually exposed on the wall surface of the hole H, the reinforcing bar There is a risk of erroneous determination that S has been detected.

Therefore, the resistance value and current value measured by the detection circuit 41 are determined so that the state to be confirmed can be detected appropriately. For example, since there is a difference of 10 ⁷ or more between the electrical resistivity of water and the electrical resistivity of the reinforcing bar S, it can be determined with certainty. The detection lamp 42 is lit only when a detection signal is generated by the detection circuit 41.

  The configuration of the grip portion 4 will be further described with reference to FIGS. The box part 43 of the gripping part 4 is formed in a cylindrical shape whose front and rear are open, and the shaft part 2 side is closed by the front lid 431 and the rear end is closed by the rear lid 432 as shown in FIG. It is.

  The end of the tube part 21 of the shaft part 2 is attached to the front lid 431. The front lid 431 is detachably fixed to the box part 43 by a fastener 431a. On the other hand, the rear lid 432 is detachably fixed to the box part 43 by a fastener 432a.

  The box portion 43 is provided with an activation button 44 that activates the reinforcing bar detection device 1. When the activation button 44 is pushed and predetermined conditions described later are met, the inspection start state is entered and the operation lamp 44a of the rear lid 432 is turned on.

  The condition for turning on the operation lamp 44 a is set by the reset device 451. As shown in FIG. 3, the reset device 451 includes a flange portion 451a larger than the diameter of the hole H and a cylindrical body portion 451b having a size that can be inserted into the hole H formed integrally with the flange portion 451a. And an annular magnet portion 451c accommodated in the body portion 451b.

  The reset device 451 is attached to the tube portion 21 so as to be movable along the axial direction of the shaft portion 2. On the other hand, a switch unit 452 is provided inside the tube unit 21 adjacent to the detection unit 3. As shown in FIG. 2, the switch unit 452 can identify the position of the switch unit 452 from the outside.

  In addition, the switch unit 452 is a magnetic switch that switches in response to the magnet unit 451c when housed inside the reset device 451 moved to the detection unit 3 side along the tube unit 21. In short, in order to start the inspection, it is not enough to press the start button 44, and the reset device 451 must be moved over the switch unit 452 to be switched on. When the switch is turned on, the operation lamp 44a provided on the rear cover 432 is turned on, so that it can be recognized from the outside.

  And if the detection part 3 detects the reinforcement S after the test start, since the detection lamp 42 provided in the back cover 432 will light, it can discriminate | determine that the reinforcement S was exposed to the wall surface of the hole H.

  If this detection lamp 42 detects only the presence or absence of the reinforcing bar S, the lighting pattern may be one kind. On the other hand, if the detection unit 3A is configured as shown in FIG. 6, the exposed position of the reinforcing bar S in the circumferential direction of the hole H can be identified. In this case, a plurality of lighting patterns are required.

  The detection unit 3A shown in an exploded perspective view in FIG. 6 has positive and negative contacts (31A, 31B, 32A, 32B) formed in a wing shape. That is, the positive electrode plate 31 described above was formed in a disc shape, but the upper and lower fan portions 312... Are removed from the positive electrode plate 31A shown on the tip bolt 36 side in FIG. , Left and right fan portions 312...

  The positive electrode plate 31 </ b> A having such a shape can contact only the rebar S exposed in the left-right direction (X direction) of the hole H. By forming the negative electrode plate 32A in the same form, the positive electrode plate 31A and the negative electrode plate 32A can detect only the reinforcing bar S in the X direction.

  On the other hand, for the reinforcing bar S exposed in the vertical direction (Y direction), the positive electrode plate 31B and the negative electrode plate 32B obtained by rotating the positive electrode plate 31A and the negative electrode plate 32A by 90 degrees are arranged. That's fine.

  If it is the detection part 3A comprised in this way, it can identify whether the reinforcing bar S is exposed to the X direction of the hole H, or is exposed to the Y direction. Accordingly, as shown in FIG. 7, two types of detection lamps 42A and 42B are provided so that the inspector can identify the detection position of the reinforcing bar S.

  First, FIG. 7A shows a lighting pattern in the case where the reinforcing bar S is exposed in the X direction of the hole H. When the reinforcing bar S is exposed in the X direction of the hole H, a current flows between the positive electrode plate 31A and the negative electrode plate 32A in FIG. The detection circuit 41 generates and outputs detection signals for lighting the detection lamps 42A and 42A arranged on the left and right sides of the rear lid 432 from the measured values.

  On the other hand, FIG. 7B shows a lighting pattern in the case where the reinforcing bar S is exposed in the Y direction of the hole H. If the reinforcing bar S is exposed in the Y direction of the hole H, a current flows between the positive electrode plate 31B and the negative electrode plate 32B in FIG. The detection circuit 41 generates and outputs a detection signal for lighting the detection lamps 42B and 42B arranged above and below the rear lid 432 from the measured value.

  By setting a plurality of lighting patterns in this way, the exposed position of the reinforcing bar S in the circumferential direction of the hole H can be identified by looking at the detection lamps 42A and 42B.

  Next, an inspection method of the hole H using the reinforcing bar detection device 1 of the present embodiment will be described with reference to FIG.

  First, as shown in FIG. 8A, the start button 44 provided on the box part 43 at the rear end of the shaft part 2 is pushed. At this stage, the operation lamp 44a is not yet lit. Therefore, as shown in FIG. 8B, the reset device 451 is moved along the shaft portion 2 to the detection portion 3 side.

  When the reset device 451 moves to a position covering the switch unit 452, the magnetic switch is turned on, the operation lamp 44a is turned on, and the inspector can recognize that the inspection has started. At this time, all the detection lamps 42 are turned off.

  Subsequently, as shown in FIG. 8C, the inspector holds the grip portion 4 and inserts the detection portion 3 toward the hole H. Here, since the outer shape of the reset device 451 is larger than that of the hole H, it is caught in the hole and is not inserted into the hole H. That is, only the detection unit 3, the shaft unit 2, and the gripping unit 4 advance by the length of the hole H.

  When the detection unit 3 moves forward in the hole H in this way, if there is a portion where the reinforcing bar S is exposed on the wall surface of the hole H, the reinforcing bar S is interposed as shown in FIG. Thus, the positive electrode plate 31 and the negative electrode plate 32 are short-circuited, and a current flows to the detection circuit 41.

  When a short circuit occurs between the positive electrode plate 31 and the negative electrode plate 32 through a member having a low electrical resistivity such as the reinforcing bar S, a current equal to or greater than a threshold set in advance in the detection circuit 41 is measured. become.

  When a detection signal is generated by the detection circuit 41 based on this measurement value, the generated detection signal is output to the detection lamp 42, and the detection lamp 42 is turned on as shown in FIG. 8D. become. When the detection lamp 42 is turned on, notification by an alarm sound such as a buzzer may be performed together.

  In addition, although the inside of the hole H may be in a wet state with the drilling water used at the time of drilling, a trace amount of flowing between the positive electrode plate 31 and the negative electrode plate 32 through the water. Since no detection signal is generated by the detection circuit 41 with current, the detection lamp 42 is not lit.

  When the detection lamp 42 is turned on, once the insertion of the detection unit 3 is stopped and the scale portion 22 (see FIG. 1) marked on the outer peripheral surface of the shaft portion 2 is read, the inspector can rebar the reinforcing bar S. It is possible to know at which depth of H it was exposed.

  Next, the operation of the reinforcing bar detection device 1 of the present embodiment will be described.

  In the reinforcing bar detection device 1 of the present embodiment configured as described above, the detection unit 3 is provided at the tip of the shaft portion 2 formed to a length that allows the entire length of the hole H to be detected. The detection unit 3 includes a conductive positive electrode plate 31 and a negative electrode plate 32, and a current greater than or equal to a threshold value between the contacts (31, 32) connected to the detection circuit 41 while distinguishing positive and negative. It is detected that the reinforcing bar S is exposed in the hole H.

  Thus, since it is the structure which provides the detection part 3 in the front-end | tip of the axial part 2, it can be set as the structure which can be inserted even if the hole H is narrow. For example, the diameter of the hole H drilled to insert a shear reinforcement is only about 20-100 mm, and measurement devices used in conventional electromagnetic exploration methods and magnetic exploration methods cannot be inserted. . Moreover, even if a fiberscope is inserted, it is difficult to find the rebar S slightly exposed in a dark and narrow hole without omission, and it takes time for inspection. On the other hand, with the reinforcing bar detection device 1 of the present embodiment, it is possible to detect the presence or absence of the exposure of the reinforcing bar S in a short time by simply inserting the detection unit 3 into the hole H.

  In addition, since it is possible to detect only when the positive electrode plate 31 and the negative electrode plate 32 are in contact with the reinforcing bar S, it is desired to confirm that only the state where the reinforcing bar S is exposed in the hole H is detected. Only the state can be reliably detected.

  That is, if the reinforcing bar S is not damaged by the drilling, it can be said that the hole H has been drilled normally. Therefore, if the reinforcing bar S is covered even with a single thin film, it is not necessary to notify that the reinforcing bar S has been detected. However, since a slight current may flow between the positive electrode plate 31 and the negative electrode plate 32 when an extremely thin concrete film is interposed between the reinforcing bars S, the detection circuit 41 detects the current. It is discriminated based on the magnitude of a measured value such as a current value.

  In addition, if the insulating plate 33 is interposed between the positive electrode plate 31 and the negative electrode plate 32, the positive electrode plate 31 and the negative electrode plate 32 may be bent or deformed. Since there is no direct contact and short circuit, false detection can be prevented.

  Furthermore, if a notification unit (42, 42A, 42B) for notifying the detection of the reinforcing bar S by light or sound is provided at the rear end of the shaft part 2, the inspector can immediately recognize the detection of the reinforcing bar S. it can.

  Moreover, if the scale part 22 for measuring the length inserted in the hole H is provided in the shaft part 2, the inspector can easily read the position in the depth direction of the hole H where the reinforcing bar S is detected. Can do.

  Then, by forming the positive electrode plate 31 and the negative electrode plate 32 with a flexible face material extending in the orthogonal direction of the shaft portion 2, the outer peripheral portion of the detection unit 3 is bent as shown on the left side of FIG. Therefore, it can be surely brought into contact with the wall surface of the hole H.

  Moreover, if it is a structure like the detection part 3A demonstrated with reference to FIG.6, 7, the position (electric current position by positive side electrode plate 31A and the negative side electrode plate 32A (or positive side) where the reinforcing bar S is exposed The position in the circumferential direction of the hole H where the reinforcing bar S is detected is specified by outputting detection signals to the detection lamps 42A and 42B so that the energization position of the electrode plate 31B and the negative electrode plate 32B) can be identified. can do.

  If the position where the reinforcing bar S is exposed in the circumferential direction of the hole H is known, it is determined whether the reinforcing bar S is a structurally important main reinforcing bar, an auxiliary arrangement bar, a hoop reinforcing bar, or the like. be able to.

  Furthermore, if the reset device 451 having an outer shape larger than the hole H is configured so as to be set in the inspection start state by being brought close to the detection unit 3, the inspection of the entire length of the hole H can be performed without omission. . That is, if the operation lamp 44a can be turned on by pressing the start button 44 in any state, the rebar S is not exposed by pressing the start button 44 when the detector 3 arrives at the bottom of the hole. You can pretend to be. On the other hand, when it is set as the condition that the inspection start state is to bring the reset device 451 that cannot be inserted into the hole H close to the detection unit 3, by reading the insertion depth with the scale unit 22 (or the shaft By comparing the length of the portion 2 protruding from the hole H and the depth of the hole H), it is possible to determine whether or not the detection portion 3 has actually been inserted to the bottom of the hole for inspection.

  Hereinafter, a reinforcing bar detection apparatus 1A having a different form from the reinforcing bar detection apparatus 1 described in the above embodiment will be described with reference to FIGS. Note that the description of the same or equivalent parts as those described in the above embodiment will be described using the same reference numerals and the same terms.

  The detection unit 3 of the reinforcing bar detection device 1 described in the above embodiment has a configuration in which a positive electrode plate 31 and a negative electrode plate 32 that are face materials extending in the direction orthogonal to the axis of the shaft portion 2 are incorporated. On the other hand, the detection part 5 demonstrated in Example 1 is attached to the front-end | tip of the axial part 6 in which the contactor was formed elastically so that opening and closing was possible.

  As shown in FIGS. 9 and 10, the shaft portion 6 of the first embodiment is a tip split portion 62 in which the tip of the joint portion 61 of the shaft portion 6 is divided into two. The leading portion 62 can be formed by dividing a cylindrical elastic member such as a steel pipe in half along the axis.

  As shown in FIG. 9, the two semi-cylindrical portions 62a and 62a are each formed into an arcuate shape along the outside so as to be separated from each other toward the tip. Since the semi-cylindrical parts 62a and 62a are made of an elastic material, they can be opened and closed elastically. That is, in the state where no external force is applied, the state is opened as shown in FIG. 9, but is closed when a force is applied in the direction of the arrow in FIG. And as shown in FIG.10 (b), it will open according to the magnitude | size of the hole H with a restoring force.

  The detection unit 5 is provided at the tip of the leading portion 62. As shown in FIG. 9, the detection unit 5 includes a positive electrode plate 51 as a positive contact, a negative electrode plate 52 as a negative contact, and an insulation plate 53 as an insulator. 62 is laminated in the circumferential direction.

  Specifically, semicylindrical bases 54A and 54B are attached to the outer circumferences of the semicylindrical parts 62a and 62a, respectively, and a plurality of positive electrode plates 51, negative electrode plates 52, and insulation are provided with respect to the bases 54A and 54B. A plate 53 is attached.

  The positive electrode plate 51 and the negative electrode plate 52 are formed into a rectangular shape by a conductive plate-like material such as a metal plate. Further, the insulating plate 53 is formed into an approximately same rectangle as the positive electrode plate 51 and the negative electrode plate 52 by an insulator such as a rubber plate.

  The positive electrode plate 51, the negative electrode plate 52, and the insulating plate 53 are attached so as to protrude in the normal direction with respect to the outer peripheral surfaces of the base portions 54A and 54B. In addition, the positive electrode plate 51, the negative electrode plate 52, and the insulating plate 53 are attached in a direction in which the surface is formed substantially parallel to the axial direction when the leading end portion 62 is closed.

  In the form shown in FIG. 9, the short side direction of the rectangular plates (51, 52, 53) coincides with the normal direction of the outer peripheral surface of the base portions 54A, 54B, and the long side direction is the axial direction of the leading portion 62. Become parallel. In short, the positive electrode plate 51, the negative electrode plate 52, and the insulating plate 53 are attached to the base portions 54 </ b> A and 54 </ b> B as face materials that spread in the direction including the axial direction of the shaft portion 6.

  A plurality of sets of positive and negative contacts and insulators are attached to the base portions 54A and 54B so that the positive electrode plate 51, the insulating plate 53, and the negative electrode plate 52 are arranged in the order of the circumferential direction.

  Since the wiring connecting the detection unit 5 and the gripping unit 4 provided at the tip of the shaft 6 in this manner is the same as the wiring by the lead wires 34, 35A, 35B of the reinforcing bar detection device 1 described above, Detailed description is omitted.

  Then, the inspection method of the hole H using the reinforcing bar detection apparatus 1A of Example 1 is demonstrated.

  First, as shown in FIG. 10A, the detection unit 5 of the reinforcing bar detection apparatus 1A is brought close to the hole of the hole H drilled in the reinforced concrete structure R, and the outer shape of the detection unit 5 is smaller than the diameter of the hole H. A force is applied in the direction of the arrow until the leading portion 62 is closed.

  When the detection unit 5 is inserted into the hole H in this state, the leading portion 62 is opened by the restoring force inside the hole H as shown in FIG. 10B, and the outer peripheral surface of the detection unit 5 becomes the wall surface of the hole H. It will be in close contact. The outer peripheral surface of the detection unit 5 is formed by the end surfaces of the positive electrode plate 51 and the negative electrode plate 52.

  For this reason, if the reinforcing bar S is exposed in the hole H, the reinforcing electrode S short-circuits between the positive electrode plate 51 and the negative electrode plate 52. If a current greater than or equal to the threshold value flows between the positive electrode plate 51 and the negative electrode plate 52, a detection signal is generated by the detection circuit 41 and the detection lamp 42 is turned on. It can be recognized that it has been detected.

  The reinforcing bar detection device 1A according to the first embodiment configured as described above has a rectangular plate-like positive and negative contact (51, 52) at the front split portion 62 at the tip of the shaft portion 6 formed to be elastically openable and closable. Is attached as a face material extending in a direction including the axial direction of the shaft portion 6.

  For this reason, the contact (51, 52) can be reliably brought into contact with the wall surface of the hole H by the elastic force (restoring force) of the leading portion 62. In addition, since the contact (51, 52) is not deformed if the elastic force of the leading portion 62 is used, the contact (51, 52) can be repeatedly inserted into the hole H. ) Itself is not easily damaged and can be used for inspection of many holes H.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  Hereinafter, a reinforcing bar detection apparatus 1B having a different form from the reinforcing bar detection apparatuses 1 and 1A described in the embodiment or Example 1 will be described with reference to FIG. Note that the description of the same or equivalent parts as the contents described in the embodiment or Example 1 will be described using the same reference numerals and the same terms.

  In the embodiment and the first embodiment, the detection units 3 and 5 having the contacts (31, 32, 51, 52) formed in a plate shape have been described. In the second embodiment, the needle-shaped contacts are used. The reinforcing bar detection device 1B provided with the detection unit 7 will be described.

  The detection unit 7 has a configuration in which a plurality of needle-shaped contacts protrude in the radial direction from the outer peripheral surface of a cylindrical base 77 provided at the tip of the shaft 2. This needle-shaped contact includes a positive needle 71 as a positive contact and a negative needle 72 as a negative contact.

  The positive side needle part 71 and the negative side needle part 72 can be formed by a conductive wire such as a copper wire, for example. Only the tip of the positive needle portion 71 and the negative needle portion 72 is exposed, and most of the portion up to the base portion 77 is covered with a covering portion 73 as an insulator. The covering portion 73 is formed of a synthetic resin such as polyvinyl chloride or polyethylene.

  A base 77 to which a plurality of positive needle portions 71,... And negative needle portions 72,... Are attached is fixed to the tip of the shaft portion 2 by a tip bolt 76. Further, the positive side needle portions 71 are connected to lead wires 74 connected to the positive side of the detection circuit 41, respectively. On the other hand, the negative needle portions 72,... Are connected to lead wires 75A, 75B connected to the negative side of the detection circuit 41.

  In the reinforcing bar detection device 1B according to the second embodiment configured as described above, the detection unit 7 includes a large number of needle-like contacts (71, ..., 72, ...). For this reason, the detection position of the reinforcing bar S can be recognized with a point.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to the embodiment and the example, and the design change is within a range not departing from the gist of the present invention. Are included in the present invention.

  For example, in the above-described embodiment, the detection lamp 42 that performs notification with light has been mainly described as the notification unit. However, the detection lamp 42 is not limited thereto, and may be a notification unit that performs notification with sound.

  Further, in the above-described embodiment, the configuration including the detection lamp 42 that can be recognized by the inspector on the spot as the output unit and a notification unit such as an alarm sound has been described as an output unit. However, the present invention is not limited to this configuration. The output unit may be a storage medium such as a monitor screen or a separately installed monitor screen.

  Furthermore, in the said embodiment, although the form in which the scale part 22 was provided in the outer peripheral surface of the axial part 2 was demonstrated, it is not limited to this, For example, the distance which has a wheel etc. for measuring insertion distance You may measure by incorporating a meter into the reinforcing bar detectors 1, 1A, 1B.

  Moreover, although the case where a metal plate etc. were used as a conductive material was demonstrated in the said embodiment, it is not limited to this, The conductive contact of this invention can be formed also with a semiconductor material. it can. If the contact is formed of a semiconductor material, the current can flow only when the material characteristic exceeds a certain size. Therefore, the detection circuit 41 is omitted and a detection signal is sent directly to the output unit. It is also possible to make it.

  Furthermore, in the said embodiment, although the structure which detects only the state in which the reinforcing bar S was exposed to the wall surface of the hole H was demonstrated, it is not limited to this, By adjusting the setting of the detection circuit 41 Even the rebar S that is not exposed but is close to the hole H can be detected.

R Reinforced concrete structure S Reinforcing bar H Hole 1 Reinforcing bar detection device 2 Shaft part 22 Scale part 3, 3A Detection part 31, 31A, 31B Positive side electrode plate (positive contact)
32, 32A, 32B Negative electrode plate (negative contact)
33 Insulation plate (insulator)
4 Gripping part (output part)
41 detection circuit 42, 42A, 42B detection lamp (notification part)
451 Reset device 452 Switch part 1A Rebar detection device 5 Detection part 51 Positive side electrode plate (positive contact)
52 Negative electrode plate (negative contact)
53 Insulation plate (insulator)
6 Axis part 62 Tip split part 1B Rebar detection device 7 Detection part 71 Positive side needle part (positive contact)
72 Negative needle (negative contact)
73 Covering part (insulator)

Claims (9)

A rebar detector that detects a rebar inserted into a hole drilled in a reinforced concrete structure,
A shaft portion formed to a length that allows the entire length of the hole to be detected;
A detection unit provided at a tip of the shaft part;
An output unit that outputs information obtained by the detection unit as a detection signal;
The detection unit has at least one set of positive and negative conductive contacts arranged so as to be able to contact the wall surface of the hole, and when a current equal to or greater than a threshold value flows between the positive and negative contacts. A reinforcing bar detection apparatus, wherein a detection signal is output to the output unit.   The reinforcing bar detection apparatus according to claim 1, wherein an insulator is interposed between the positive and negative contacts.   The said output part has the alerting | reporting part provided in the rear end of the said axial part, and when the said detection signal is output, the alerting | reporting by the said alerting | reporting part will be performed. Rebar detection device.   The reinforcing bar detecting device according to any one of claims 1 to 3, wherein the shaft portion is provided with a scale portion for measuring a length inserted into the hole.   The reinforcing bar detection device according to any one of claims 1 to 4, wherein the contact is formed of a flexible face material extending in an axis orthogonal direction of the shaft portion.   The reinforcing bar detecting device according to any one of claims 1 to 4, wherein the contact is attached to a tip of the shaft portion formed to be elastically openable and closable.   The reinforcing bar detection device according to claim 1, wherein the contact is formed in a needle shape.   The reinforcing bar detection device according to any one of claims 1 to 7, wherein the detection signal is output so that an energization position by the contact can be identified.   A reset device having an outer shape larger than the hole is mounted on the shaft portion so as to be movable in the axial direction, and the reset device is moved to a switch portion provided at a position adjacent to the detection portion. The reinforcing bar detecting device according to any one of claims 1 to 8, wherein the inspection start state is set by.