Diagnosis device of tensioning force, and inspection system

Abstract

To inspect a tensioning force of a tension device such as a ground anchor easily and efficiently.SOLUTION: A measurement circuit board 29 and a physical property sensor (a strain sensor) 23 are assembled into an anchor plate 37 of a ground anchor 3. The measurement circuit board 29 detects physical property change of the anchor plate 37 using the physical property sensor 23 to measure a tensioning force of the ground anchor 3 and transmits the measurement data to an outside by radio. The measurement circuit board 29 and the physical property sensor 23 are covered by protective materials 45, 47. On the protective material 45 of the measurement circuit board 29, a marker protrusion 49 exhibiting a position of the measurement circuit board 29 is provided.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a tensioning device that uses tension to fix or support an object such as a structure at a specific location, such as a ground anchor, an anchor bolt, or a suspension cable, and to a device for measuring and diagnosing the tension, and a system combining these devices.

Background Art

[0002] For example, known techniques for inspecting the tension of a ground anchor are disclosed in Patent Documents 1 to 3.

[0003] Patent Document 1 discloses an invention related to a lift-off test of a ground anchor. Patent Document 2 discloses a technique of attaching a magnetic permeability sensor to an anchor plate during inspection. Patent Document 3 discloses a technique of sandwiching a measurement piece in advance between the nut at the head of the ground anchor and the anchor plate, and bringing a detection probe into contact with the surface of the measurement piece during inspection.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] The lift-off test as described in Patent Document 1 requires a heavy jack, a lot of work, and a long time, resulting in high inspection costs and low efficiency. Compared with this, according to the technologies described in Patent Document 2 and Patent Document 3, the labor and costs for inspection are small. However, in the case of the technology described in Patent Document 2, cleaning the surface of the dirty anchor plate before inspection is required, and in the case of the technology described in Patent Document 3, removing the protective cap of the head of the anchor before inspection and reinstalling it after inspection, etc., require considerable work and time for preparation before inspection and cleanup after inspection.

[0006] One object of the present invention is to enable the inspection of the tension force to be performed more simply and efficiently.

Means for Solving the Problems

[0007] According to one embodiment, the tension force measuring device is applied to a tensioning device having the following configuration. That is, the tensioning device has a tensioning member having a head, and a washer interposed between the head of the tensioning member and the object and having a flange portion protruding outward from the head, and is configured to press the object through the washer by the head.

[0008] The measuring device according to one embodiment applied to such a tensioning device includes the washer, a physical property sensor fixed to the flange portion of the washer, and a measurement circuit board fixed to the flange portion of the washer and electrically connected to the physical property sensor.

[0009] And the measurement circuit board is configured to measure, through the physical property sensor, the physical property change occurring in the flange portion of the washer according to the tension force, and wirelessly transmit measurement data indicating the measurement result to the outside.

[0010] When the shape of the washer in plan view is polygonal, the physical property sensor may be arranged on or near the diagonal line of the surface of the flange portion of the washer.

[0011] Further, a sensor protection material that covers and protects the physical property sensor from the outside may be fixed to the flange portion of the washer. Similarly, a circuit protection material that covers and protects the measurement circuit board from the outside may be fixed to the flange portion of the washer.

[0012] Furthermore, marker protrusions may be provided in the vicinity of the measurement circuit board on the flange portion of the washer.

[0013] Also, when a protective cap that protects the head of the tension member is fixed to the surface of the flange portion of the washer, the physical property sensor may be disposed inside the protective cap of the flange portion.

[0014] A diagnostic device for a tensioning device according to an embodiment is applied to the following tensioning device. That is, it is a tensioning device provided with a measuring device that wirelessly transmits measurement data of the tensioning force.

[0015] A diagnostic device according to an embodiment applied to such a tensioning device includes a communication antenna for wirelessly receiving the measurement data from the measuring device, an activation switch mechanism that turns on when pressed against a predetermined location of the tensioning device, a diagnostic circuit that executes an inspection process in response to the activation of the activation switch mechanism, and a diagnostic lamp that emits light to display the diagnostic result given by the diagnostic circuit.

[0016] Then, in the inspection process, the diagnostic circuit receives the measurement data from the measurement circuit through the communication antenna, performs a diagnosis regarding the tensioning force using the received measurement data, and causes the diagnostic lamp to emit light and display according to the result of the diagnosis.

[0017] Furthermore, a diagnostic device according to an embodiment has an overall size and an overall weight that allow an operator to carry it with one hand.

[0018] A diagnostic device according to an embodiment includes a rod-shaped handle for an operator to grasp by hand, and the communication antenna and the activation switch mechanism are arranged at one end of the handle, and a connection part for connecting an extension arm is provided at the other end of the handle.

[0019] The diagnostic circuit may include means for storing the measurement data and the diagnostic result, and means for transmitting the measurement data and the diagnostic result to an external general-purpose information processing terminal.

[0020] An inspection system for a tensioning device according to an embodiment includes the measurement device and the diagnostic device as described above.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

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Figure 7

Figure 8

Mode for Carrying Out the Invention

[0022] Hereinafter, a tension inspection system (hereinafter referred to as this system) according to an embodiment applied to the tension inspection of a ground anchor will be described.

[0023] FIG. 1 shows the system configuration of this system.

[0024] As shown in FIG. 1, the present system 1 includes a measuring device 5, a diagnostic device 7, a display communication device 9, and a management device 11.

[0025] The measuring device 5 is already incorporated into the ground anchor 3 when the installation of the ground anchor 3 is completed, and thereafter remains mounted on the ground anchor 3 at all times, whether during inspection or non-inspection. At a site where a plurality of ground anchors 3 are installed, one measuring device 5 can be incorporated into each ground anchor 3.

[0026] The measuring device 5 has a function of measuring physical property changes, such as the magnitude of mechanical strain, that occur in the anchor plate of the ground anchor 3 (see FIG. 3 described later) due to the tension of the ground anchor 3. The inspection device 5 stores the identification code (hereinafter referred to as ID) of the ground anchor 3, and can transmit measurement data 15 including the measurement result and the ID to the diagnostic device 7 non-contact (wirelessly).

[0027] The diagnostic device 7 has an overall size and overall weight that can be carried and operated by an operator with one hand, and is spatially separated from the inspection device 5. The diagnostic device 7 is configured to start the inspection process when the operator presses it against a marker protrusion (see FIG. 3 described later) provided on the ground anchor 3.

[0028] When the diagnostic device 7 starts the inspection process, first, it supplies driving power 13 to the measuring device 5 non-contact (wirelessly) to activate the measuring device 5, and then receives the measurement data 15 transmitted from the measuring device 5 non-contact (wirelessly). Subsequently, the diagnostic device 7 stores the received measurement data 15 in the diagnostic device 7 and diagnoses the tension of the ground anchor 3 using the measurement data 15.

[0029] The diagnosis result of the tension can be, for example, divided into three levels: normal, abnormal, and caution (for example, a state where the nut of the anchor head can be tightened further). Subsequently, the diagnostic device 7 stores the diagnosis result in the diagnostic device 7 in association with the ID of the ground anchor 3, and displays the diagnosis result in a way that can be recognized by the operator's five senses (for example, vision and hearing), such as by lighting lamps that indicate normal, abnormal, and caution in different colors of green, red, and yellow respectively. The time taken for the above series of inspection processes is about 2 to 3 seconds. Even at a site where there are a large number of ground anchors 3, the operator can efficiently diagnose all the ground anchors 3 in a short time while grasping the diagnosis results of each ground anchor 3 in real time.

[0030] The diagnostic device 7 can further transmit the diagnostic data 17, which includes the measurement data 15 of one or more ground anchors 3 and the diagnosis result stored in the diagnostic device 7, to the external display communication device 9 in a non-contact (wireless) manner.

[0031] The display communication device 9 serves to relay the communication of the diagnostic data between the diagnostic device 7 and the remote management device 11, and to analyze and display the inspection data of the ground anchor 3 in detail. It is desirable for the display communication device 9 to be able to communicate using a wide-area communication network such as the Internet or a mobile communication network, have a display screen for displaying detailed information, and be capable of performing complex information processing. In that regard, for example, a popular general-purpose information processing device called a so-called smartphone, tablet terminal, or personal computer can be adopted as the display communication device 9.

[0032] The display communication device 9 receives diagnostic data 17 of one or more ground anchors 3 from the diagnostic device 7, and displays the detailed content of each diagnostic data 17 on the display screen, analyzes each diagnostic data 17, and displays the analysis result on the display screen. Further, the display communication device 9 stores the diagnostic data 17 of one or more ground anchors 3 and its analysis result in the display communication device 9, and transmits the stored diagnostic data 17 and its analysis result to a remote management device 11 through a communication network.

[0033] The management device 11 receives detailed diagnostic data 19 of one or more ground anchors 3 from the display communication device 9, and stores the received detailed diagnostic data 19 in the management device 11. Then, the management device 11 uses the stored detailed diagnostic data 19 to perform information processing such as maintenance inspection management of each site where a plurality of ground anchors are installed and maintenance inspection management of each ground anchor 3.

[0034] Figure 2 shows the block configuration of the measuring device 5.

[0035] As shown in Figure 2, the measuring device 5 includes a measuring circuit 21, one or more physical property sensors, for example, one or more strain sensors 23, a power receiving antenna (power receiving coil) 25, and a communication antenna (communication coil) 27. The measuring circuit 21 is electrically connected to the strain sensor 23, the power receiving antenna (power receiving coil) 25, and the communication antenna (communication coil) 27.

[0036] The strain sensor 23 as a physical property sensor senses a physical property change occurring in the anchor plate (see Figure 3 described later), for example, a mechanical strain of the anchor plate, according to the tension of the ground anchor 3. The strain sensor 23 is, for example, a resistive strain gauge using a semiconductor or metal, and is fixed to the surface of the anchor plate.

[0037] The measurement circuit 21 is an electronic circuit that uses the strain sensor 23 to measure a value corresponding to the magnitude of the mechanical strain of the anchor plate, and a known configuration can be adopted for its specific configuration. The measured value measured by the measurement circuit 21 substantially indicates the magnitude of the tension of the ground anchor 3. The measurement circuit 21 stores the ID of the ground anchor 3 on which it is mounted, and can transmit measurement data 15 including the ID and the above-mentioned measured value to an external diagnostic device 7 through the communication antenna (communication coil) 27.

[0038] The measurement circuit 21 does not have a built-in power source, and is activated when it receives the driving power 13 from the diagnostic device 7 through the power receiving antenna (power receiving coil) 25, and performs the above operations.

[0039] The measurement circuit 21, the power receiving antenna (power receiving coil) 25, and the communication antenna (communication coil) 27 are, for example, mounted on a single circuit board and formed as a thin and flat plate (or sheet or film) (hereinafter referred to as a measurement circuit board) 29. And this measurement circuit board 29 is fixed on the surface of the anchor plate of the ground anchor 3.

[0040] FIG. 3 shows a partial cross-sectional view of the main part of the ground anchor 3 in which the above-described measuring device 5 is incorporated.

[0041] As shown in Fig. 3, the ground anchor 3 has an elongated tension member 31, and the main body of the tension member 31 (the lower part not shown in Fig. 3) is fixed to, for example, the underground ground. The head 31A of the tension member 31 penetrates an object 33 such as a structure on the ground surface and protrudes from the surface of the object 33. The head 31A of the tension member 31 has a male thread, and a nut 35 is screwed onto the male thread. A washer, that is, an anchor plate 37, is sandwiched between the nut 35 and the object 33. The anchor plate 37 is generally a steel plate having a polygonal shape (typically a square or a rectangle) in plan view, and a through hole is provided at its center, and the head 31A of the tension member 31 is inserted through the through hole. Since the area of the anchor plate 37 in plan view is much wider than that of the nut 35, the anchor plate 37 has a portion protruding outward from the nut 35, and this portion is herein referred to as a flange portion.

[0042] By tightening the nut 35, the nut 35 presses the object 33 via the anchor plate 37, and at the same time the tension member 31 is tensioned, and the tension force generates a pressing force. At that time, stresses of magnitudes corresponding to the magnitude of the tension force are generated in each part of the anchor plate 37, and physical property changes, such as mechanical strain, corresponding to the magnitude of the stress occur.

[0043] The structure for pressing the anchor plate 37, which includes the head 31A of the tension member 31 and the nut 35 screwed thereto, inside the ground anchor 3 is herein referred to as an anchor head 39. An anchor cap 41 for protecting this from the outside is put on the anchor head 39. The anchor cap 41 is a cylindrical body with a closed upper part and has a cap nut 43 inside. By screwing the cap nut 43 onto the head 31A of the tension member 31, the anchor cap 41 is fixed to the anchor head 39. The skirt at the lower end of the anchor cap 41 is in close contact with the surface of the anchor plate 37 to prevent the intrusion of moisture and the like from the outside to the inside.

[0044] On the surface of the flange portion of the anchor plate 37 (the portion protruding outward from the anchor head 39), the measurement circuit board 29 constituting the measurement circuit 5 and one or more strain sensors 23 (such as 23A, 23B, or 23C) are fixed. All of the measurement circuit board 29, or at least the portion of the power receiving and communication antenna, is disposed outside the anchor cap 41 on the surface of the anchor plate 37. Thereby, communication with the diagnostic device 7 and power reception are less likely to be obstructed by the anchor cap 41. Also, at the position between the power receiving and communication antenna (power receiving and communication coil) 25, 27 (see FIG. 2) of the measurement circuit board 29 and the anchor plate 37, for example, on the surface of the measurement circuit board 29 that contacts the anchor plate 37, a plate (film or sheet) 42 made of a magnetic material (such as ferrite) for electromagnetic shielding is provided to suppress the absorption of the power supply and communication energy by the anchor plate 37.

[0045] One or more strain sensors 23 (23A, 23B, or 23C) may be disposed inside the anchor cap 41, such as the strain sensor 23B, or may be disposed outside the anchor cap 41, such as the strain sensors 23A and 23C. The strain sensor 23 disposed inside the anchor cap 41 is protected by the anchor cap 41.

[0046] The measurement circuit board 29 and the strain sensors 23 (23A and 23C) disposed outside the anchor cap 41 on the surface of the anchor plate 37 are covered on the outer surface with protective materials 45, 47 for protecting each of them from the outside. For example, the measurement circuit board 29 is covered with a protective material (plate, sheet, film, or coating layer) 45 made of a material that does not affect non-contact power supply and wireless communication and is fixed on the surface of the anchor plate 37. Also, the strain sensor 23 may be protected together with the measurement circuit board 29 by the same protective plate 45, such as the strain sensor 23A, or may be protected by another protective material (plate, sheet, film, or coating layer) 47 fixed on the surface of the anchor plate 37, such as the strain sensor 23C.

[0047] On the outer surface of the protective material 45 covering the measurement circuit board 29, marker projections 49 are provided. The marker projections 49 are, for example, columnar projections with a diameter of about 2 to 3 centimeters and a height of about 1 to 2 centimeters. When an operator presses the diagnostic device 7 against the marker projections 49, the diagnostic device 7 automatically starts the inspection process.

[0048] FIG. 4 shows an example of the planar arrangement on the anchor plate 37 of the measurement circuit board 29 and the strain sensors 23 that constitute the measurement device 5.

[0049] As shown in FIG. 4, the measurement circuit board 29 is disposed on the surface of a portion that projects outward from the anchor cap 41 within the flange portion that projects outward from the nut 35 of the anchor plate 37. One or more strain sensors - 23 (23D, 23E, 23F, 23G, 23H, or 23J) are disposed, for example, at positions on the diagonal line 51 on the surface of the flange portion of the anchor plate 37, such as the strain sensors 23D, 23E, 23F, or at positions in the vicinity of the diagonal line 51, such as the strain sensors 23G, 23H, 23J.

[0050] According to the result of analyzing the stress distribution generated in the anchor plate 37 by tension through computer simulation, the stress is greater the closer it is to the nut 35 located at the center of the anchor plate 37. Also, if the distance from the nut 35 is the same, the stress tends to be greater the closer it is to the diagonal line 51 of the polygonal planar shape of the anchor plate 37. That is, the stress is highest in the portion directly pressed by the nut 35. In the flange portion protruding outside the nut 35, the portion 51 shown by the dense embossed pattern surrounded by the two-dot chain line has the second highest stress. Further, the portion 55 shown by the rough embossed pattern surrounded by the one-dot chain line outside that has the third highest stress, and the portion shown by the blank area outside that has the lowest stress. According to such a stress distribution of the anchor plate 37, it is preferable to arrange the strain sensor 23 on or near the diagonal line 51 within the surface of the flange portion in order to increase the sensitivity of measuring the strain caused by stress. Also, it is preferable to arrange the strain sensor 23 at a position closer to the nut 35 on or near the diagonal line 51, for example, inside the anchor cap 41, or within the distance range within one-half closer to the center from the center to the corner end on the diagonal line 51 and its vicinity area (that is, the area 53 in the figure).

[0051] Figures 5, 6, and 7 respectively show a side view, a front view, and a bottom view of the diagnostic device 7.

[0052] As shown in Figures 5, 6, and 7, the diagnostic device 7 has a rod-shaped handle 3 that an operator can grasp with one hand. A battery case 63 and a main circuit case 65 are provided at the rear end of the handle 3. An antenna case 67 is provided at the front end of the handle 3.

[0053] Inside the battery case 63, a battery 71 which is the power source of the diagnostic device 7 is accommodated. Inside the main circuit case 65, a main circuit board 73 is accommodated. The main circuit board 73 has a diagnostic circuit which receives measurement data from the measuring device 5 of the ground anchor 3 and diagnoses the tension of the ground anchor 3. The main circuit board 73 also has a communication circuit for performing wireless communication and wired communication with an external display communication device 9. Furthermore, the main circuit board 73 is electrically connected to various electrical components (described later) inside the antenna case 67.

[0054] On the outer surface of the main circuit case 65, a main power switch 75 for the operator to turn on and off the power of the main circuit board 73 is provided. Also, on the outer surface of the main circuit case 65, near the handle 62, an illumination switch 77 for the operator to turn on and off the illumination lamp 89 of the antenna case 67 is provided.

[0055] The antenna case 67 has a flat front surface 67A at the position farthest from the handle 61. At the center of this front surface 67A, for example, a disc-shaped switch plate 81 is provided. The switch plate 81 is movable by a small distance of about 0.5 to 1 centimeter in the front-rear direction, and is elastically pushed forward at its back by a spring member 83 arranged behind the switch plate 81 inside the antenna case 67. Also, behind the switch plate 81, a start switch 85 which is turned on by the retreat of the switch plate 81 is arranged. In response to the turn-on of the start switch 85, the main circuit board 73 starts an inspection process (measurement data reception operation and tension diagnosis operation).

[0056] Inside the antenna case 67, an antenna set 87 is also accommodated. The antenna set 87 has a power supply antenna (power supply coil) for non-contact power supply to the measuring device 5 and a communication antenna (communication coil) for wirelessly receiving measurement data from the measuring device 5. The antenna set 87 is arranged, for example, near the front surface 67A inside the antenna case 67 and near the switch plate 81.

[0057] Furthermore, one or more lighting lamps 89 are provided on the front surface 67A of the antenna case 67. The lighting lamp 89 illuminates the front (lower in the figure) of the antenna case 67 with light. The lighting lamp 89 is turned on and off by a lighting switch 77 provided near the handle 61. When inspecting at a dark site, the lighting lamp 89 helps the operator to visually recognize the position of the ground anchor 5.

[0058] One or more diagnostic lamps 91 are provided at a position on the rear surface 67B of the antenna case 67 facing the handle 61 that is not hidden by the shadow of the hand holding the handle 67 as viewed from the operator. The diagnostic lamp 91 is driven by the main circuit board 73 and displays the diagnostic result. The diagnostic lamp 91 can be lit in, for example, four different colors: blue, green, red, and yellow. When the main circuit board 73 starts the inspection process, first, the diagnostic lamp 91 is lit in, for example, blue, and then, when the diagnostic result is obtained, the diagnostic lamp 91 is lit in a color corresponding to the diagnostic result, for example, green for normal, red for abnormal, and yellow for caution.

[0059] A connection part (for example, a screw hole) 11 for connecting an extension arm (not shown) is provided at the rear end part of the diagnostic device 7 that is farthest from the antenna case 67. By connecting the extension arm to the connection part of the diagnostic device 7, the diagnostic device 7 can be reached to the ground anchor 3 at a position where the operator's hand cannot reach and inspected.

[0060] When inspecting the ground anchor 3, the operator grasps the handle 61 of the diagnostic device 7 by hand and presses the switch board 81 on the front surface 67A of the antenna case 67 against the marker protrusion 49 (see FIG. 3) on the anchor plate 37 of the ground anchor 3. Then, the diagnostic device 7 starts the inspection process.

[0061] FIG. 8 shows the flow of the inspection process of the diagnostic device 7.

[0062] As shown in FIG. 8, when the main power supply is on, the diagnostic device 7 continuously checks periodically in step S1 whether the start switch 85 has been turned on. When the turn-on of the start switch 85 is detected, the inspection process is started. In the inspection process, in step S2, power is supplied to the measuring device 5. In step S3, measurement data is received from the measuring device 5. In step S4, the power supply to the measuring device 5 is terminated, and in step S5, the tension is diagnosed using the received measurement data, and the diagnosis result is stored in the diagnostic device 7. In step S6, the diagnostic lamp 91 lights up in a color corresponding to the diagnosis result.

[0063] The embodiments described above are merely illustrative for explanation purposes and are not intended to limit the scope of the present invention only to those embodiments. The present invention can be implemented in various forms different from the above embodiments.

[0064] The present invention can also be applied to tensioning devices other than ground anchors, such as anchor bolts, sling ropes, fastening bolts, etc. Further, the diagnostic device according to the present invention is not applicable only to tensioning devices in which a measuring device is incorporated in a washer as in the above-described embodiments. For example, like the fastening bolts described in JP-A-2016-169997 and JP-A-2020-177034, the present invention can also be applied to those in which a measuring device is incorporated in the head or the main body of a tensioning member. For example, when applying the diagnostic device according to an embodiment to the fastening bolt described in JP-A-2020-177034, if the switch board of the diagnostic device is pressed against the head of the fastening bolt, the diagnostic device automatically performs an inspection.

Explanation of Reference Numerals

[0065] 1 Inspection system 3 Ground anchor (tensioning device) 5 Measuring device 7 Diagnostic device 9 Display communication device 11 Management device 13 Driving power 15 Measurement data 17 Diagnostic data 25 Power receiving antenna 27 Communication antenna 21 Measurement circuit 29 Measurement circuit board 23 Strain sensor (physical property sensor) 31 Tension member 33 Object 35 Nut 37 Anchor plate (washer) 39 Anchor head 41 Anchor cap (protective cap) 45, 47 Protective material 49 Marker protrusion 51 Diagonal line 61 Handle 63 Battery case 65 Main circuit case 67 Antenna case 71 Battery 73 Main circuit board 81 Switch board 83 Spring member 85 Start switch 87 Antenna set 89 Lighting lamp 91 Diagnostic lamp

Claims

1. An apparatus for measuring the tension of a tension member, comprising: a tension member having a head; and a washer interposed between the head of the tension member and an object, the washer having a flange portion that projects outward from the head, the apparatus being configured to press the object through the washer by the head. In the apparatus, the washer; a physical property sensor fixed to the flange portion of the washer; a measurement circuit board fixed to the flange portion of the washer and electrically connected to the physical property sensor; wherein the measurement circuit board is configured to measure, through the physical property sensor, a physical property change occurring in the flange portion of the washer according to the tension, and wirelessly transmit measurement data indicating the measurement result to the outside. A measuring device.

2. The measuring device according to claim 1, wherein when the shape of the washer in plan view is polygonal, the physical property sensor is disposed on or near a diagonal line of the surface of the flange portion of the washer.

3. The measuring device according to any one of claims 1 to 2, further comprising: a sensor protection material fixed to the flange portion of the washer to cover and protect the physical property sensor from the outside; and a circuit protection material fixed to the flange portion of the washer to cover and protect the measurement circuit board from the outside.

4. The measuring device according to any one of claims 1 to 3, further comprising a marker protrusion fixed near the measurement circuit board on the flange portion of the washer.

5. The measuring device according to any one of claims 1 to 4, wherein when a protection cap for protecting the head of the tension member is fixed to the surface of the flange portion of the washer, the physical property sensor is disposed inside the protection cap of the flange portion.

6. The measuring device according to any one of claims 1 to 5, wherein the measurement circuit board has a power receiving antenna for receiving power non-contact from the outside, a communication antenna for communicating wirelessly with the outside, and a magnetic member for electromagnetic shielding disposed between the power receiving antenna and the communication antenna and the washer.

7. In a diagnostic apparatus for a tensioning device provided with a measuring device that wirelessly transmits measurement data of the tension, a communication antenna for wirelessly receiving the measurement data from the measuring device; and an activation switch mechanism that turns on when pressed against a predetermined location of the tensioning device. ​ ​ ​ ​ A diagnostic circuit that executes an inspection process in response to the turn-on of the start switch mechanism, A diagnostic lamp that emits light to display the diagnostic result obtained by the diagnostic circuit are provided, the diagnostic circuit is configured to receive the measurement data from the measurement circuit through the communication antenna in the inspection process, perform a diagnosis regarding the tensile force using the received measurement data, and cause the diagnostic lamp to emit light according to the result of the diagnosis, and further, a diagnostic device configured to have an overall size and an overall weight that can be carried by an operator with one hand.

8. In the diagnostic device according to claim 7, it is provided with a rod-shaped handle for an operator to grasp by hand, the communication antenna and the start switch mechanism are arranged at one end of the handle, and a connection portion for connecting an extension arm is provided at the other end of the handle. Diagnostic device.

9. In the diagnostic device according to any one of claims 7 to 8, the diagnostic circuit includes means for storing the measurement data and the diagnostic result, and means for transmitting the measurement data and the diagnostic result to an external general-purpose information processing terminal. Diagnostic device.

10. An inspection system for a tensioning device, comprising the measuring device according to claim 1 and the diagnostic device according to claim 7.

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