Tension measuring device, diagnostic device, 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 an apparatus for measuring and diagnosing tension in tensioning devices, such as ground anchors, anchor bolts, and slings, that use tension to fix or support an object such as a structure at a specific location, and a system that combines these devices. [Background technology]

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

[0003] Patent Document 1 discloses an invention related to lift-off testing of ground anchors. Patent Document 2 discloses a technique for mounting a magnetic permeability sensor on an anchor plate during inspection. Patent Document 3 discloses a technique for clamping a measurement piece between the nut on the head of the ground anchor and the anchor plate in advance, and for applying a detection probe to the surface of the measurement piece during inspection. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-231515 A [Patent Document 2] JP 2002-048659 A [Patent Document 3] JP 2007-101205 A Summary of the Invention [Problem 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. In comparison, the techniques described in Patent Documents 2 and 3 require less labor and cost for inspection. However, in the case of the technique described in Patent Document 2, a considerable amount of work and time is required for preparation before the inspection and for cleaning up after the inspection, such as cleaning the dirty anchor plate surface before the inspection, and in the case of the technique described in Patent Document 3, removing the protective cap on the anchor head before the inspection and reattaching it after the inspection.

[0006] One object of the present invention is to make it possible to carry out tension testing more easily and efficiently. [Means for solving the problem]

[0007] The tension measuring device according to one embodiment is applied to a tensioning device having the following configuration: the tensioning device has a tendon having a head, and a washer having a flange portion interposed between the head of the tendon and the object and projecting outward from the head, and is configured so that the head presses the object via the washer.

[0008] A measurement 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] The measurement circuit board is configured to measure, via the physical property sensor, a change in physical properties that occurs in the flange portion of the washer in response to the tension force, and to wirelessly transmit measurement data indicating the measurement results to an external device.

[0010] When the washer has a polygonal shape in a plan view, the physical property sensor may be disposed on a diagonal line of the surface of the flange portion of the washer or in the vicinity of the diagonal line.

[0011] A sensor protection material for covering and protecting the physical property sensor from the outside may be fixed to the flange portion of the washer. Similarly, a circuit protection material for covering and protecting the measurement circuit board from the outside may be fixed to the flange portion of the washer.

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

[0013] In addition, when a protective cap for protecting the head of the tendon 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] The diagnostic device for a tensioning device according to one embodiment is applied to a tensioning device which is equipped with a measurement device for wirelessly transmitting measurement data of the tension force.

[0015] A diagnostic device according to one embodiment applied to such a tensioning device includes a communication antenna for wirelessly receiving the measurement data from the measurement device, a start-up switch mechanism that is turned on when pressed against a predetermined location on the tensioning device, a diagnostic circuit that executes an inspection process in response to the start-up switch mechanism being turned on, and a diagnostic lamp that emits light to indicate the diagnostic result made by the diagnostic circuit.

[0016] During the inspection process, the diagnostic circuit receives the measurement data from the measurement circuit via the communication antenna, performs a diagnosis on the tension using the received measurement data, and causes the diagnostic lamp to light up depending on the result of the diagnosis.

[0017] Furthermore, the diagnostic device according to one embodiment has an overall size and weight that allows an operator to carry it in one hand.

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

[0019] The diagnostic circuit may comprise 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] According to one embodiment, an inspection system for a tensioning device comprises a measurement device and a diagnostic device as described above. [Brief description of the drawings]

[0021] [Figure 1] 1 shows a system configuration of a tension testing system according to one embodiment. [Diagram 2] The block diagram of the measurement device of the system is shown. [Diagram 3] A partial cross-sectional view of the main parts of a ground anchor into which the measuring device is incorporated is shown. [Figure 4] 1 shows the planar arrangement of the measuring device on an anchor plate. [Diagram 5] FIG. 2 shows a side view of the diagnostic device of the system. [Figure 6] 2 shows a front view of the diagnostic device. [Figure 7] FIG. [Figure 8] The flow of the inspection process of the diagnostic device is shown. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

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

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

[0025] The measuring device 5 is already installed in 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, even during inspection and not during inspection. At a site where multiple ground anchors 3 are installed, one measuring device 5 can be installed in each ground anchor 3.

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

[0027] The diagnostic device 7 has an overall size and weight that allows an operator to carry and operate it 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 (described later, see FIG. 3) provided on the ground anchor 3.

[0028] When the diagnostic device 7 starts the inspection process, it first supplies driving power 13 to the measuring device 5 in a non-contact (wireless) manner to start the measuring device 5, and then receives measurement data 15 transmitted from the measuring device 5 in a non-contact (wireless) manner. Next, the diagnostic device 7 stores the received measurement data 15 in the diagnostic device 7, and uses the measurement data 15 to diagnose the tension of the ground anchor 3.

[0029] The diagnosis result of the tension can be, for example, in three stages: normal, abnormal, and caution (for example, a state in which the nut of the anchor head only needs to be tightened). Next, the diagnostic device 7 associates the diagnosis result with the ID of the ground anchor 3 and stores it therein, and displays the diagnosis result in a manner that allows the worker to recognize it with the five senses (for example, sight, hearing, etc.), for example, by lighting a lamp that indicates normal, abnormal, and caution in different colors, green, red, and yellow, respectively. The time required for the above series of inspection processes is about 2 to 3 seconds. Even at a site where many ground anchors 3 are present, the worker can efficiently diagnose all the ground anchors 3 in a short time while grasping the diagnosis result of each ground anchor 3 in real time.

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

[0031] The display and communication device 9 has a role of relaying communication of diagnostic data between the diagnostic device 7 and the remote management device 11, and a role of analyzing and displaying the inspection data of the ground anchor 3 in detail. It is desirable for the display and communication device 9 to be capable of communicating using a wide area communication network such as the Internet or a mobile communication network, to have a display screen for displaying detailed information, and to be capable of performing complex information processing. In this respect, for example, a popular general-purpose information processing device such as a so-called smartphone, tablet terminal, or personal computer can be adopted as the display and 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 details of each diagnostic data 17 on a display screen, analyzes each diagnostic data 17, and displays the analysis results on the display screen. Furthermore, the display communication device 9 stores the diagnostic data 17 of one or more ground anchors 3 and the analysis results therein, and also transmits the stored diagnostic data 17 and the analysis results to a remote management device 11 via a communication network.

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

[0034] FIG. 2 shows a block diagram of the measurement device 5.

[0035] 2, the measurement device 5 has a measurement 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 measurement 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 is for sensing changes in physical properties, for example, mechanical strain of the anchor plate, that occur in the anchor plate (described later, see FIG. 3) in response to the tension of the ground anchor 3. The strain sensor 23 is, for example, a resistance strain gauge using a semiconductor or metal, and is fixed to the surface of the anchor plate.

[0037] The measuring circuit 21 is an electronic circuit that uses a 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 as its specific configuration. The measurement value measured by the measuring circuit 21 substantially indicates the magnitude of the tension of the ground anchor 3. The measuring 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 measurement value to the external diagnostic device 7 via a communication antenna (communication coil) 27.

[0038] The measuring 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 via the power receiving antenna (power receiving coil) 25, and performs the above-mentioned operations.

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

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

[0041] As shown in FIG. 3, the ground anchor 3 has an elongated tendon 31, and the main body of the tendon 31 (the lower part not shown in FIG. 3) is fixed to, for example, the ground underground. The head 31A of the tendon 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 tendon 31 has a male thread, and a nut 35 is screwed onto the male thread. A washer, i.e., 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 rectangle) in a plan view, and has a through hole at its center, through which the head 31A of the tendon 31 is inserted. Since the area of ​​the anchor plate 37 in a plan view is much larger than that of the nut 35, the anchor plate 37 has a portion that protrudes outward from the nut 35, and this portion is referred to as a flange portion here.

[0042] When the nut 35 is tightened, 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 generates a pressing force. At that time, stress is generated in each part of the anchor plate 37 according to the magnitude of the tension, and a change in physical properties, such as mechanical distortion, occurs according to the magnitude of the stress.

[0043] Within the ground anchor 3, the structure for pressing the anchor plate 37, which includes the head 31A of the tendon 31 and the nut 35 screwed onto it, is referred to here as the anchor head 39. The anchor head 39 is covered with an anchor cap 41 to protect it from the outside. The anchor cap 41 is a cylinder with a closed top, and has a cap nut 43 on the inside. The anchor cap 41 is fixed to the anchor head 39 by screwing the cap nut 43 onto the head 31A of the tendon 31. The bottom of the anchor cap 41 fits tightly against the surface of the anchor plate 37, preventing moisture and the like from entering inside from the outside.

[0044] A measuring circuit board 29 and one or more strain sensors 23 (such as 23A, 23B, or 23C) constituting the measuring circuit 5 are fixed on the surface of the flange portion (portion protruding outward from the anchor head 39) of the anchor plate 37. The entire measuring circuit board 29, or at least a portion of the power receiving / communication antenna, is disposed on the surface of the anchor plate 37, outside the anchor cap 41. This makes it difficult for the anchor cap 41 to interfere with communication and power reception with the diagnostic device 7. In addition, a plate (film or sheet) 42 made of a magnetic material (such as ferrite) is provided for electromagnetic shielding, suppressing absorption of power supply and communication energy by the anchor plate 37, between the power receiving / communication antennas (power receiving / communication coils) 25, 27 (see FIG. 2) of the measuring circuit board 29 and the anchor plate 37, for example, on the surface of the measuring circuit board 29 that contacts 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 strain sensor 23B, or may be disposed outside the anchor cap 41, such as strain sensors 23A and 23C. The strain sensor 23 disposed inside the anchor cap 41 is protected by the anchor cap 41.

[0046] The outer surfaces of the measurement circuit board 29 and the strain sensor 23 (23A and 23C) arranged outside the anchor cap 41 on the surface of the anchor plate 37 are covered with protective materials 45, 47 for protecting 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 the contactless power supply and wireless communication and fixed on the surface of the anchor plate 37. The strain sensor 23 may be protected together with the measurement circuit board 29 by the same protective plate 45, for example, as the strain sensor 23A, or may be protected by a separate protective material (plate, sheet, film, or coating layer) 47 fixed on the surface of the anchor plate 37, for example, as the strain sensor 23C.

[0047] A marker protrusion 49 is provided on the outer surface of the protective material 45 that covers the measurement circuit board 29. The marker protrusion 49 is, for example, a cylindrical protrusion 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 protrusion 49, the diagnostic device 7 automatically starts the inspection process.

[0048] FIG. 4 shows an example of a planar arrangement of the measurement circuit board 29 and the strain sensor 23 constituting the measurement device 5 on the anchor plate 37. In FIG.

[0049] 4, the measurement circuit board 29 is disposed on the surface of the portion of the flange portion of the anchor plate 37 that protrudes outward from the nut 35, the portion protruding outward from the anchor cap 41. One or more strain sensors 23 (23D, 23E, 23F, 23G, 23H, or 23J) are disposed on a diagonal 51 on the surface of the flange portion of the anchor plate 37, for example, strain sensors 23D, 23E, and 23F, or in the vicinity of the diagonal 51, for example, strain sensors 23G, 23H, and 23J.

[0050] According to the results of analyzing the distribution of stress generated in the anchor plate 37 by tension force by computer simulation, the closer to the nut 35 located at the center of the anchor plate 37, the greater the stress, and if the distance from the nut 35 is the same, the closer to the diagonal 51 of the polygonal planar shape of the anchor plate 37, the greater the stress. That is, the stress is highest in the part directly pressed by the nut 35. In the flange part protruding outward from the nut 35, the part 51 shown by the dense pear-finish surrounded by the two-dot chain line has the second highest stress. Furthermore, the part 55 shown by the coarse pear-finish surrounded by the one-dot chain line on the outside of that has the third highest stress, and the part shown by the white ground on the outside of that has the lowest stress. According to such stress distribution of the anchor plate 37, it is preferable to arrange the strain sensor 23 on or near the diagonal 51 within the surface of the flange part in order to increase the sensitivity of the measurement of strain caused by stress. It is also preferable to place the strain sensor 23 on the diagonal 51 or in its vicinity, at a position closer to the nut 35, for example, at a position inside the anchor cap 41, or within half the distance range from the center to the corner end on the diagonal 51 toward the center and its vicinity (i.e., area 53 in the figure).

[0051] 5, 6 and 7 show side, front and bottom views, respectively, of diagnostic device 7.

[0052] 5, 6, and 7, the diagnostic device 7 has a rod-shaped handle 3 that an operator can hold 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] A battery 71, which is the power source for the diagnostic device 7, is accommodated inside the battery case 63. A main circuit board 73 is accommodated inside the main circuit case 65. The main circuit board 73 has a diagnostic circuit that 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 wireless communication and wired communication with an external display and communication device 9. Furthermore, the main circuit board 73 is electrically connected to various electric components (described later) inside the antenna case 67.

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

[0055] The antenna case 67 has a flat front surface 67A at a position farthest from the handle 61. A switch plate 81, for example, in the shape of a disk, is provided in the center of the front surface 67A. The switch plate 81 is movable in the front-rear direction by a small distance of about 0.5 to 1 cm, and its rear surface is elastically pushed forward by a spring member 83 arranged behind the switch plate 81 inside the antenna case 67. In addition, behind the switch plate 81, a start switch 85 is arranged, which is turned on when the switch plate 81 moves backward. In response to the start switch 85 being turned on, the main circuit board 73 starts the inspection process (receiving measurement data and diagnosing tension).

[0056] An antenna set 87 is also housed inside the antenna case 67. The antenna set 87 has a power feeding antenna (power feeding coil) for contactlessly feeding power 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 disposed, 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 lamps 89 illuminate the front of the antenna case 67 (the downward direction in the figure). The lighting lamps 89 are turned on and off by a lighting switch 77 provided near the handle 61. When performing an inspection in a dark site, the lighting lamps 89 help the worker to visually confirm the position of the ground anchor 5.

[0058] One or more diagnostic lamps 91 are provided on the rear surface 67B of the antenna case 67 facing the handle 61, at a location that will not be hidden by the hand of an operator gripping the handle 67. The diagnostic lamps 91 are driven by the main circuit board 73 to display the diagnosis results. The diagnostic lamps 91 can be lit in four different colors, for example, blue, green, red, and yellow. When the main circuit board 73 starts the inspection process, it first lights up the diagnostic lamps 91 in blue, for example, and then, when the diagnosis results are obtained, it lights up the diagnostic lamps 91 in a color corresponding to the diagnosis result, for example, green for normal, red for abnormal, and yellow for caution.

[0059] A connection part (e.g., a screw hole) 11 for connecting an extension arm (not shown) is provided at the rear end of the diagnostic device 7, which is the 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 reach a ground anchor 3 that is out of reach of an operator and inspect it.

[0060] When inspecting the ground anchor 3, the worker grasps the handle 61 of the diagnostic device 7 with his / her hand and presses the switch plate 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 is on, the diagnostic device 7 periodically continues to check whether the start switch 85 has been turned on in step S1. When it is detected that the start switch 85 has been turned on, the inspection process is started. In the inspection process, power is supplied to the measuring device 5 in step S2. Measurement data is received from the measuring device 5 in step S3. Power supply to the measuring device 5 is stopped in step S4, and tension diagnosis is performed using the received measurement data in step S5, and the diagnosis result is stored in the diagnostic device 7. In step S6, the diagnosis lamp 91 is lit in a color according to the diagnosis result.

[0063] The above-described embodiments are merely examples for the purpose of explanation, and are not intended to limit the scope of the present invention to these embodiments. The present invention can be embodied in various forms other than the above-described embodiments.

[0064] The present invention can also be applied to tensioning devices other than ground anchors, such as anchor bolts, slings, and fastening bolts. The diagnostic device according to the present invention is not only applicable to tensioning devices in which a measuring device is incorporated in a washer as in the above-described embodiment, but can also be applied to those in which a measuring device is incorporated in the head or body of a tensioning material, such as the fastening bolts described in JP 2016-169997 A and JP 2020-177034 A. For example, when the diagnostic device according to one embodiment is applied to the fastening bolt described in JP 2020-177034 A, the diagnostic device automatically performs an inspection by pressing the switch plate of the diagnostic device against the head of the fastening bolt. [Explanation of symbols]

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

Claims

1. A device for measuring tension of a tension member for a tensioning device having a tension member with a head, and a washer having a flange portion interposed between the head of the tension member and an object and projecting outward from the head, the device being configured to press the object with the head via the washer, The washer; one or more physical property sensors 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; Equipped with the measurement circuit board is configured to measure a change in a physical property occurring in the flange portion of the washer in response to the tension force through the physical property sensor, and to wirelessly transmit measurement data indicating the measurement result to an external device; The washer has a polygonal shape in a plan view, and the one or more physical property sensors are disposed at diagonal positions on the surface of the flange portion of the washer. Measuring equipment.

2. 2. The measuring device according to claim 1, A measuring device in which a plurality of the physical property sensors are disposed at a plurality of positions each having a different distance from the center of the diagonal line.

3. 3. The measuring device according to claim 1, A measuring device, wherein at least one of the physical property sensors is disposed within half of a distance range from the center of the diagonal line to a corner end toward the center.

4. 4. The measuring device according to claim 1, a sensor protection material that is fixed to the flange portion of the washer and that covers and protects the physical property sensor from the outside; a circuit protection material that is fixed to the flange portion of the washer and covers and protects the measurement circuit board from the outside; The measuring device further comprises:

5. 5. The measuring device according to claim 1, The measurement device further comprises a marker protrusion fixed to the flange portion of the washer adjacent the measurement circuit board.

6. 6. The measuring device according to claim 1, A protective cap for protecting a head of the tendon is fixed to a surface of the flange portion of the washer, and the physical property sensor is disposed inside the protective cap of the flange portion. Measuring equipment.

7. 7. The measuring device according to claim 1, A measuring device, wherein the measuring circuit board has a power receiving antenna for receiving power from the outside in a non-contact manner, a communication antenna for communicating wirelessly with the outside, and a magnetic member for electromagnetic shielding arranged between the power receiving antenna, the communication antenna, and the washer.

8. 2. The measuring device according to claim 1, In addition, the equipment is equipped with a portable diagnostic device that can be held in one hand by the worker. The diagnostic device comprises: a communication antenna for wirelessly receiving the measurement data from the measurement device; a start switch mechanism that turns on when pressed against a predetermined position of the tension device; a diagnostic circuit that performs a test process in response to turning on the activation switch mechanism; a diagnostic lamp for indicating the diagnosis result made by the diagnostic circuit by light emission; Equipped with The diagnostic circuit is configured to receive the measurement data from the measurement circuit board through the communication antenna during the inspection process, perform a diagnosis on the tension using the received measurement data, and cause the diagnostic lamp to display light according to the result of the diagnosis. Measuring equipment.

9. 9. The measuring device according to claim 8, The diagnostic device comprises: It is provided with a rod-shaped handle for the operator to grasp with his / her hand, The communication antenna and the activation switch mechanism are disposed on one end of the handle, A connection portion for connecting an extension arm is provided at the other end of the handle. Measuring equipment.

10. 10. The measuring device according to claim 8, The diagnostic circuitry comprises: a means for storing the measurement data and the diagnosis results; a means for transmitting the measurement data and the diagnosis result to an external general-purpose information processing terminal.

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