WO2022162899A1 - Ｕボルト、施工方法及び計測装置 - Google Patents

Ｕボルト、施工方法及び計測装置 Download PDF

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Publication number
WO2022162899A1
WO2022162899A1 PCT/JP2021/003356 JP2021003356W WO2022162899A1 WO 2022162899 A1 WO2022162899 A1 WO 2022162899A1 JP 2021003356 W JP2021003356 W JP 2021003356W WO 2022162899 A1 WO2022162899 A1 WO 2022162899A1
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WO
WIPO (PCT)
Prior art keywords
pair
bolt
strain
shaft
shaft portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/003356
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English (en)
French (fr)
Japanese (ja)
Inventor
大樹 小林
淳 荒武
雄大 池口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to US18/274,660 priority Critical patent/US20240093714A1/en
Priority to PCT/JP2021/003356 priority patent/WO2022162899A1/ja
Priority to JP2022577972A priority patent/JPWO2022162899A1/ja
Publication of WO2022162899A1 publication Critical patent/WO2022162899A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
    • F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
    • F16L3/02—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets partly surrounding the pipes, cables or protective tubing
    • F16L3/04—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets partly surrounding the pipes, cables or protective tubing and pressing it against a wall or other support
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
    • F16L3/08—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing
    • F16L3/10—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing divided, i.e. with two members engaging the pipe, cable or protective tubing
    • F16L3/1091—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing divided, i.e. with two members engaging the pipe, cable or protective tubing with two members, the two members being fixed to each other with fastening members on each side
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes

Definitions

  • This disclosure relates to U-bolts, construction methods, and measuring devices.
  • U-bolts are used to fix fasteners such as piping to fastened objects such as frames and walls.
  • a U-bolt is a U-shaped bolt in which two linear shafts are connected by a bridge.
  • U-bolt When fixing an object to be fastened with a U-bolt, it is necessary to fix the U-bolt vertically to the object to be fastened.
  • U-bolts are often attached at an angle due to their structure. If the U-bolt is installed at an angle, it can cause damage due to overstress.
  • Non-Patent Document 1 describes a technique of providing a piezoelectric patch on a washer that is inserted into a bolt and measuring the fastening force of the bolt based on the pressure measured by the piezoelectric patch.
  • Non-Patent Document 2 describes a technique of embedding a piezoelectric sensor in the shaft of a bolt and measuring the fastening force of the bolt based on the strain of the shaft of the bolt measured by the piezoelectric sensor.
  • Non-Patent Documents 1 and 2 above are techniques for measuring the fastening force of a straight bolt, and cannot confirm the fastening state of the U-bolt to the fastening object.
  • the purpose of the present disclosure which has been made in view of the above problems, is to provide a U-bolt, a construction method, and a measuring device that can confirm the fastening state of the U-bolt to the object to be fastened.
  • the U-bolt includes a pair of shaft portions aligned in a first direction and extending in a second direction orthogonal to the first direction, and the pair of shaft portions and a bridge portion connecting one end of the U-bolt, which is attached to at least one shaft portion of the pair of shaft portions so as to face each other with the shaft portion sandwiched in the first direction,
  • a first pair of strain gauges are provided for outputting a signal corresponding to bending of the shaft portion in the second direction.
  • the construction method uses a measuring device to measure a pair of shaft portions aligned in a first direction and extending in a second direction orthogonal to the first direction. and a bridge portion connecting one end of each of the pair of shaft portions, wherein the U-bolt is connected to at least one of the pair of shaft portions by the measuring device.
  • a pair of strain gauges for outputting a signal corresponding to the bending of the shaft in the second direction are attached to the shaft of the joint so as to face each other across the shaft in the first direction.
  • the measuring device includes a pair of shaft portions arranged in a first direction and extending in a second direction perpendicular to the first direction;
  • a measuring device for fastening a U-bolt comprising a bridge portion connecting one end of each portion, wherein the U-bolt has at least one shaft portion of the pair of shaft portions.
  • a pair of through-holes provided in the object to be fastened, wherein a pair of strain gauges for outputting a signal corresponding to bending in the second direction are attached facing each other across the shaft portion in the first direction.
  • the pair of strain gauges are attached based on the signals output from the pair of strain gauges in response to the tightening of the nuts from the other ends of the shaft portions to the pair of shaft portions inserted into the and an output unit configured to output information on tightening of the nut to the shaft based on the strain detected by the detecting unit.
  • the U-bolt, construction method, and measuring device According to the U-bolt, construction method, and measuring device according to the present disclosure, it is possible to check the fastening state of the U-bolt to the fastening object.
  • FIG. 4 is a diagram showing a configuration example of a U-bolt according to the first embodiment of the present disclosure
  • FIG. It is a figure which shows the state which fixed the fastening thing to the to-be-fastened thing with the U bolt shown in FIG. It is the figure which looked at the axial part shown in FIG. 1 from the X-axis direction.
  • 2 is a diagram for explaining tensile force and compressive force acting on a U-bolt when the axial force acting on the shaft portion shown in FIG. 1 is uniform;
  • FIG. FIG. 2 is a diagram for explaining tensile force and compressive force acting on a U-bolt when the axial force acting on the shaft portion shown in FIG.
  • FIG. 4 is a diagram showing another configuration example of the U-bolt according to the first embodiment of the present disclosure
  • FIG. 7 is a flow chart showing an example of the operation of the measuring device shown in FIG. 6
  • FIG. 5 is a diagram showing an example of a U-bolt configuration according to a second embodiment of the present disclosure
  • FIG. 10 is a cross-sectional view taken along line C-C' shown in FIG. 9;
  • FIG. 1 is a diagram showing a configuration example of a U-bolt 10 according to the first embodiment of the present disclosure.
  • the U-bolt 10 includes shaft portions 11A and 11B forming a pair, a bridge portion 12, and strain gauges 14A and 14B.
  • the shafts 11A and 11B are arranged in a predetermined direction and extend in a direction orthogonal to the predetermined direction.
  • the direction in which the shafts 11A and 11B are arranged side by side is referred to as the X-axis direction (first direction)
  • the direction in which the shafts 11A and 11B extend is referred to as the Y-axis direction (first direction).
  • a direction orthogonal to the X-axis direction and the Y-axis direction is referred to as a Z-axis direction (third direction).
  • the shaft part 11 when not distinguishing shaft part 11A, 11B, it is called the shaft part 11.
  • the shaft portions 11A and 11B are collectively referred to as a pair of shaft portions 11. As shown in FIG.
  • One end of the shaft portion 11A and one end of the shaft portion 11B are connected by a bridge portion 12 curved in a semicircular shape.
  • One end of the shaft portion 11A and one end of the shaft portion 11B are connected by the bridge portion 12, so that the U-bolt 10 forms a U-shape.
  • a screw portion 13 having a screw thread structure is formed on the other end side of each of the shaft portions 11A and 11B.
  • a fastener 1 such as a pipe is placed inside the U-shaped U-bolt 10 (the space surrounded by the pair of shaft portions 11 and the bridge portion 12).
  • the shaft portions 11A and 11B are inserted from one surface side of the fastening object 2 into a pair of through holes 2A and 2B provided in the fastening object 2 such as a support metal fitting.
  • the threaded portions 13 of the shafts 11A and 11B protrude to the other side of the object 2 to be fastened.
  • Nuts 3A and 3B having a thread structure that engages with the thread structure of the threaded portion 13 are tightened on the threaded portion 13 of the shaft portions 11A and 11B projecting from the other side of the object to be fastened 2, thereby 1 is sandwiched and fixed between a U-bolt 10 and an object 2 to be fastened.
  • the nuts 3A and 3B are referred to as nuts 3 when not distinguished from each other.
  • the U-bolt 10 further includes strain gauges 14A and 14B, as shown in FIG. In the example shown in FIG. 1, the strain gauges 14A and 14B are attached to the shaft portion 11A.
  • FIG. 3 is a view of the shaft portion 11A viewed in the X-axis direction toward the shaft portion 11B. That is, FIG. 3 is a view of the outer surface of the shaft portion 11A (the side opposite to the side on which the fastener 1 is arranged) viewed from the X-axis direction. As shown in FIG. 3, a strain gauge 14A is attached to the outer surface of the shaft portion 11A at a position substantially centered in the Z-axis direction of the shaft portion 11A.
  • the strain gauge 14B is attached to the inner side of the shaft portion 11A so as to face the strain gauge 14A with the shaft portion 11A interposed therebetween. In this manner, a pair of strain gauges 14A and 14B facing each other across the shaft portion 11A in the X-axis direction are attached to the shaft portion 11A.
  • the strain gauges 14A and 14B are referred to as strain gauges 14 when not distinguished from each other.
  • the strain gauge 14A arranged on the outside in the X-axis direction and the strain gauge 14B arranged on the inside in the X-axis direction are collectively referred to as a pair of strain gauges 14.
  • the strain gauge 14 deforms (tensile/compresses) according to the bending of the shaft portion 11 to which the strain gauge 14 is attached, and outputs a signal (voltage signal) according to the deformation. Specifically, the strain gauge 14 is attached to the shaft portion 11 so as to output a signal corresponding to bending in the Y-axis direction of the shaft portion 11 to which the strain gauge 14 is attached.
  • the U-bolt 10 according to the present embodiment is attached to one of the pair of shaft portions 11, ie, the shaft portion 11A, facing the shaft portion 11A in the X-axis direction.
  • a pair of strain gauges 14 (first pair of strain gauges) are provided for outputting a signal corresponding to bending in the Y-axis direction.
  • a pair of shaft portions 11 are inserted into a pair of through holes 2A and 2B provided in the object to be fastened 2, and the object to be fastened 1 is sandwiched between the U-bolt 10 and one surface of the object to be fastened 2.
  • the strain gauge 14 can output a signal corresponding to the bending of the attached shaft portion 11 in the Y-axis direction.
  • the scale of the strain gauge 14 in FIG. 1 is not necessarily the same as the actual scale. The same applies to FIGS.
  • FIGS. 4A and 4B are diagrams showing a state in which the U-bolt 10 is fastened to the object 2 to be fastened.
  • FIG. 4A is a diagram showing the tensile force and compressive force acting on the U-bolt 10 when the force (axial force) tightening the shaft portions 11A and 11B is uniform.
  • FIG. 4B is a diagram showing the tensile force and compressive force acting on the U-bolt 10 when the axial forces acting on the shaft portions 11A and 11B are uneven. Note that illustration of the strain gauge 14 is omitted in FIGS. 4A and 4B.
  • the axial forces acting on the shaft portions 11A and 11B are uneven.
  • the strain gauges 14 are attached to the shaft portion 11 of the strain gauges 14A and 14B, and the strain is detected from the output signals of the strain gauges 14A and 14B. It is possible to check whether or not the axial force acting on 11A and shaft portion 11B is uniform. As a result, the operator can tighten the shaft portion 11 with the nut 3 so that the axial force acting on the shaft portion 11A and the shaft portion 11B is uniform, and appropriately fasten the U-bolt 10 to the fastened object 2. can.
  • FIG. 5 is a diagram illustrating an example of a hardware configuration of the measuring device 20 according to an embodiment of the present disclosure.
  • FIG. 5 shows an example of the hardware configuration of the measuring device 20 when the measuring device 20 is configured by a computer capable of executing program commands.
  • the computer may be a general-purpose computer, a dedicated computer, a work station, a PC (Personal Computer), an electronic notepad, or the like.
  • Program instructions may be program code, code segments, etc. for performing the required tasks.
  • the measuring device 20 is a smartphone, the operator can easily carry the measuring device 20 to a place where the U bolt 10 is fastened to the object 2 to be fastened when installing or inspecting the U bolt 10, which is convenient. be improved.
  • the measuring device 20 includes a processor 110, a ROM (Read Only Memory) 120, a RAM (Random Access Memory) 130, a storage 140, an input section 150, a display section 160 and a communication interface (I/F) 170.
  • the processor 110 is specifically a CPU (Central Processing Unit), MPU (Micro Processing Unit), GPU (Graphics Processing Unit), DSP (Digital Signal Processor), SoC (System on a Chip) or the like. may be configured by a plurality of processors of
  • the processor 110 controls each component and executes various arithmetic processes. That is, processor 110 reads a program from ROM 120 or storage 140 and executes the program using RAM 130 as a work area. The processor 110 performs control of each configuration and various arithmetic processes according to programs stored in the ROM 120 storage 140 . In this embodiment, the ROM 120 or storage 140 stores a program according to the present disclosure.
  • Programs are stored in non-transitory storage media such as CD-ROM (Compact Disk Read Only Memory), DVD-ROM (Digital Versatile Disk Read Only Memory), USB (Universal Serial Bus) memory, etc. may be provided in Also, the program may be downloaded from an external device via a network.
  • CD-ROM Compact Disk Read Only Memory
  • DVD-ROM Digital Versatile Disk Read Only Memory
  • USB Universal Serial Bus
  • the ROM 120 stores various programs and various data.
  • RAM 130 temporarily stores programs or data as a work area.
  • the storage 140 is configured by a HDD (Hard Disk Drive) or SSD (Solid State Drive) and stores various programs including an operating system and various data.
  • the input unit 150 includes a pointing device such as a mouse and a keyboard, and is used for various inputs.
  • the display unit 160 is, for example, a liquid crystal display, and displays various information.
  • the display unit 160 may employ a touch panel method and function as the input unit 150 .
  • the communication interface 170 is an interface for communicating with other devices such as external devices (not shown), and uses standards such as Ethernet (registered trademark), FDDI, and Wi-Fi (registered trademark), for example.
  • FIG. 6 is a diagram showing an example of the functional configuration of the measuring device 20 according to the present disclosure.
  • the measuring device 20 according to the present disclosure measures the strain of the shaft portion 11 of the U-bolt 10 and outputs information regarding the tightening state of the nut 3 to the shaft portion 11 according to the measurement result.
  • the measuring device 20 includes a measuring section 21, a detecting section 22, a recording section 23, and an output section 24.
  • the measurement unit 21 and the detection unit 22 constitute a control unit (controller).
  • the control unit may be configured by dedicated hardware such as ASIC (Application Specific Integrated Circuit) or FPGA (Field-Programmable Gate Array), or may be configured by a processor as described above.
  • the recording unit 23 is configured by the RAM 130 or the storage 140, for example.
  • the output unit 24 may include a display unit 160, for example.
  • the measurement unit 21 is connected via lead wires to a pair of strain gauges 14 attached to the shaft portion 11 of the U-bolt 10, and acquires signals output from the pair of strain gauges 14 respectively. Specifically, the measurement unit 21 measures voltage changes associated with expansion and contraction of the strain gauges 14A and 14B. Since the method of measuring the voltage change accompanying expansion and contraction of the strain gauge 14 is the same as the method used in a general strain measuring device, the description is omitted. The measurement unit 21 outputs the measurement result to the detection unit 22 .
  • the detection unit 22 Based on the signal acquired by the measurement unit 21, the detection unit 22 detects the strain (bending) in the Y-axis direction of the shaft unit 11 to which the pair of strain gauges 14 are attached. That is, based on signals output from the pair of strain gauges 14 in response to the tightening of the nut 3 from the other end of the shaft portion 11, the detecting portion 22 detects the shaft portion 11A to which the pair of strain gauges 14 are attached. Detect strain.
  • the recording unit 23 records the detection result of the detection unit 22 . By doing so, for example, it is possible to leave a trail of completion of normal construction (fastening of the U-bolt 10).
  • the output unit 24 outputs information regarding tightening of the nut 3 to the shaft portion 11 based on the detection result of the detection unit 22 .
  • the detection unit 22 detects tensile force or compressive force acting on the outside and inside of the shaft portion 11A to which the pair of strain gauges 14 are attached.
  • the tensile force or compressive force acting on the outer side and the inner side of the shaft portion 11A is a force generated according to the inclination of the shaft portion 11A with respect to the fastened object 2 in the X-axis direction.
  • the output unit 24 outputs information regarding tightening of the nut 3 to the shaft portion 11 based on the detection result of the detection unit 22 . For example, based on the output signals of the pair of strain gauges 14, the output unit 24 detects that a tensile force is acting on the outside and the inside of the shaft portion 11A (tensile strain is occurring). As information on tightening of the nut 3 to 11, information indicating that the shaft portions 11A and 11B are tightened equally is output.
  • the output unit 24 detects, for example, based on the output signals of the pair of strain gauges 14 that compressive strain is generated on the outside of the shaft portion 11A and that tensile strain is generated on the inside of the shaft portion 11A. , as information about tightening of the nut 3 to the shaft portion 11, information indicating that the shaft portion 11A is tightened more strongly than the shaft portion 11B is output. In addition, the output unit 24 detects, for example, based on the output signals of the pair of strain gauges 14 that tensile strain is occurring on the outside of the shaft portion 11A and compressive strain is acting on the inside of the shaft portion 11A. In this case, information indicating that the shaft portion 11B is tightened more strongly than the shaft portion 11A is output as information on tightening of the nut 3 to the shaft portion 11 .
  • the pair of strain gauges 14 are attached only to the shaft portion 11A, but the present disclosure is not limited to this.
  • a pair of strain gauges 14 may be attached only to the shaft portion 11B.
  • a pair of strain gauges 14 may be attached to both of the shaft portions 11A and 11B. Therefore, the U-bolt 10 according to the present embodiment is attached to at least one of the pair of shaft portions 11 so as to face the shaft portion 11 with the shaft portion 11 therebetween in the X-axis direction.
  • a pair of strain gauges 14 are provided for outputting a signal corresponding to bending in the Y-axis direction. As shown in FIG. 7, when a pair of strain gauges 14 are attached to both the shaft portions 11A and 11B, the four strain gauges 14 are attached at the same height (at the same position in the Y-axis direction).
  • the measuring portion 21 is attached to the pair of strain gauges 14 attached to the shaft portion 11A and the shaft portion 11B.
  • a change in voltage output from each of the pair of attached strain gauges 14 is measured.
  • the detection unit 22 Based on the measurement result of the measurement unit 21, the detection unit 22 detects the strain in the Y-axis direction of each of the pair of shaft portions 11 to which the pair of strain gauges 14 are attached.
  • the detection unit 22 converts the voltage measured by the measurement unit 21 into a strain amount, and calculates a strain amount ⁇ A of the shaft portion 11A and a strain amount ⁇ B of the shaft portion 11B. Furthermore, the detection unit 22 calculates the difference ⁇ between the strain amount ⁇ A of the shaft portion 11A and the strain amount ⁇ B of the shaft portion 11B. The detection unit 22 outputs the calculated strain amount ⁇ A , strain amount ⁇ B and the difference ⁇ between the strain amount ⁇ A and the strain amount ⁇ B to the recording unit 23 . The detection unit 22 also outputs the difference ⁇ between the strain amount ⁇ A and the strain amount ⁇ B to the output unit 24 .
  • the detection unit 22 may detect a target difference ⁇ 1 , which is the difference between the strain amount ⁇ and the target strain ⁇ T. In this case, the detection unit 22 can further detect whether or not the absolute value of the target difference ⁇ 1 is less than a predetermined threshold.
  • the target strain ⁇ T is the strain ⁇ generated in the shaft portion 11 on which the target axial force (target axial force) is acting.
  • the detection unit 22 detects the first representative value and the first representative value based on the output signals of the strain gauges 14 attached to both the shaft portions 11A and 11B. 2 representative values are detected. Based on the first representative value and the second representative value, the detection unit 22 can detect the strain amount ⁇ A and the strain amount ⁇ B of both shaft portions 11A and 11B.
  • the detection unit 22 can detect the target differences ⁇ 1A and ⁇ 1B , which are the differences between the strain amounts ⁇ A and strain ⁇ B , respectively, and the target strain ⁇ T as the target difference ⁇ 1 .
  • the detection unit 23 can further detect whether the absolute values of the target differences ⁇ 1A and ⁇ 1B are less than a predetermined threshold.
  • the detection unit 23 can detect the relative difference ⁇ 2 , which is the difference between the strain amount ⁇ A and the strain amount ⁇ B . In this case, the detection unit 23 can further detect whether the absolute value of the relative difference ⁇ 2 is less than a predetermined threshold.
  • the output unit 24 outputs information regarding tightening of the nut 3 to the shaft portion 11 based on the detection result of the detection unit 22 .
  • the output unit 24 when the difference .epsilon . Outputs information indicating that is evenly fastened. Further, for example, when the difference ⁇ between the strain amount ⁇ A and the strain amount ⁇ B is not within a predetermined range, the output unit 24 outputs a pair of shaft portions 11 outputs information indicating that each is not uniformly fastened. In this case, the output unit 24 tightens the nut 3A to the shaft portion 11A or tightens the nut 3B to the shaft portion 11B according to the difference ⁇ between the strain amount ⁇ A and the strain amount ⁇ B. A prompt may be output.
  • the output unit 24 outputs information regarding tightening of the nut 3 to the shaft portion 11 such that the angle ⁇ in the X-axis direction formed by the shaft portion 11 and the fastened object 2 is 90 degrees.
  • the strain amounts detected by the pair of strain gauges 14 attached to each of the pair of shaft portions 11 are equal, and the strain amounts and the strain amounts detected by the strain gauges 14A attached to the shaft portion 11A are equal to each other. If the amount of strain detected by the strain gauge 14B attached to the portion 11B is not equal, it is considered that the axial force acting on the shaft portion 11A and the axial force acting on the shaft portion 11B are different.
  • the output unit 24 is arranged so that the strain amounts detected by the pair of strain gauges 14 attached to the shaft portion 11A and the pair of strain gauges 14 attached to the shaft portion 11B are equal. It outputs information about the tightening of the nut 3 on the shaft portion 11 , such as adjusting the tightening of the nut 3 on the shaft 11 .
  • FIG. 8 is a flow chart showing an example of the operation of the measuring device 20 according to this embodiment, and is a diagram for explaining a construction method for mounting the U bolt 10 using the measuring device 20. As shown in FIG.
  • the detection unit 22 detects the strain in the Y-axis direction of the shaft portion 11 to which the pair of strain gauges 14 are attached based on the signals output from the pair of strain gauges 14 and acquired by the measurement unit 21 (step S11 ). As described above, the signal output from the strain gauge 14 is transmitted from the other end of the shaft portion 11 to each of the pair of shaft portions 11 inserted into the pair of through holes 2A and 2B provided in the fastened object 2. are signals output from each of the pair of strain gauges 14 in accordance with the tightening of the nut 3.
  • the output unit 24 outputs information regarding tightening of the nut 3 to the shaft portion 11 based on the strain detected by the detection unit 22 (step S12).
  • the U-bolt 10 is attached to at least one of the pair of shaft portions 11 so as to face the shaft portion 11 in the X-axis direction.
  • a pair of strain gauges 14 are provided for outputting a signal corresponding to bending in the Y-axis direction.
  • the construction method according to the present embodiment includes a step of detecting strain (step S11) and a step of outputting information (step S12).
  • step S11 a step of detecting strain
  • step S12 a step of outputting information
  • the measuring device 20 includes a detection section 22 and an output section 24 .
  • the detection part 22 detects a pair of nut 3 from the other end of the shaft part 11 inserted into the pair of through holes 2A and 2B provided in the object 2 to be fastened, respectively. Based on the signals output from the strain gauges 14, the strain in the Y-axis direction of the shaft portion 11 to which the pair of strain gauges 14 are attached is detected.
  • the output unit 24 outputs information about tightening of the nut 3 to the shaft portion 11 based on the strain detected by the detection unit 22 .
  • the signal output from the pair of strain gauges 14 in response to the tightening of the nut 3 to the shaft portion 11 of the U-bolt 10 fastened to the object 2 indicates the strain of the shaft portion 11 due to the tightening of the nut 3.
  • the fastening state of the U-bolt 10 to the fastened object 2 can be confirmed.
  • the U-bolt 10 can be fastened to the object 2 to be fastened in an appropriate fastening state. . Therefore, the operator can fasten the U-bolt 10 to the object 2 to be fastened with high accuracy, and accordingly can firmly fix the object 1 to be fastened.
  • FIG. 9 is a diagram showing an example configuration of a U-bolt 10A according to the second embodiment of the present disclosure.
  • 10 is a cross-sectional view taken along line CC' shown in FIG. 9 and 10, the same components as in FIG. 7 are denoted by the same reference numerals, and descriptions thereof are omitted.
  • the U-bolt 10A further includes a strain gauge 15A and a strain gauge 15B as compared with the U-bolt 10 shown in FIG.
  • the strain gauges 15A and 15B are attached to the shaft portion 11A so as to face each other with the shaft portion 11A interposed therebetween in the Z-axis direction.
  • a strain gauge 15A and a strain gauge 15B are similarly attached to the shaft portion 11B.
  • Each of the strain gauges 15A and 15B outputs a signal corresponding to bending of the attached shaft portion 11 in the Y-axis direction.
  • the strain gauges 15A and 15B attached to the shaft portion 11 facing each other in the Z-axis direction are collectively referred to as a pair of strain gauges 15 (a second pair of strain gauges). As shown in FIG.
  • the pair of strain gauges 15 are affixed at positions obtained by rotating the pair of strain gauges 14 by 90 degrees on the XZ plane.
  • the inclination of the U-bolt 10 can be detected also in the Z-axis direction (tilting angle direction) by providing the pair of strain gauges 15 .
  • FIG. 9 shows an example in which a pair of strain gauges 15 are attached to both the shaft portions 11A and 11B
  • a pair of strain gauges 15 may be attached to only one of the shaft portions 11A and 11B. That is, the U-bolt 10A according to the present embodiment is attached to at least one of the pair of shaft portions 11 so as to sandwich the shaft portion 11 in the Z-axis direction.
  • a pair of strain gauges 15 are further provided for outputting a signal corresponding to bending in the Y-axis direction of the.
  • strain gauges 14 and 15 attached to the shaft portion 11 are attached at the same height (at the same position in the Y-axis direction). By doing so, the difference between the axial force acting on the shaft portion 11A and the axial force acting on the shaft portion 11B can be accurately measured.
  • a computer can be preferably used to function as each part of the measuring device 20 described above.
  • Such a computer is implemented by storing a program describing the processing details for realizing the function of each part of the measuring device 20 in the memory of the computer, and reading and executing the program by the processor of the computer. be able to. That is, the program can cause the computer to function as the measuring device 20 described above. It is also possible to record the program on a non-temporary recording medium. It is also possible to provide the program via a network.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
PCT/JP2021/003356 2021-01-29 2021-01-29 Ｕボルト、施工方法及び計測装置 Ceased WO2022162899A1 (ja)

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US18/274,660 US20240093714A1 (en) 2021-01-29 2021-01-29 U-bolt, construction method, and measuring device
PCT/JP2021/003356 WO2022162899A1 (ja) 2021-01-29 2021-01-29 Ｕボルト、施工方法及び計測装置
JP2022577972A JPWO2022162899A1 (https=) 2021-01-29 2021-01-29

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JPH11304054A (ja) * 1998-04-23 1999-11-05 Meisei Ind Co Ltd 配管防食支持構造
JP2005221254A (ja) * 2004-02-03 2005-08-18 Juki Corp 軸力測定器具、軸力測定装置及び軸力測定方法
JP2010216804A (ja) * 2007-07-06 2010-09-30 Uchimura:Kk 軸力検出用締結体、締結体ユニット、軸力監視システム
WO2016159245A1 (ja) * 2015-03-31 2016-10-06 株式会社ＮｅｊｉＬａｗ 通電路付部材及び通電路のパターニング方法、部材変化計測方法
JP2019215272A (ja) * 2018-06-13 2019-12-19 株式会社ＮｅｊｉＬａｗ 嵌合構造

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JPH0634464A (ja) * 1992-07-20 1994-02-08 Kobe Steel Ltd マグネシウム合金のボルトゆるみ試験方法

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JPH11304054A (ja) * 1998-04-23 1999-11-05 Meisei Ind Co Ltd 配管防食支持構造
JP2005221254A (ja) * 2004-02-03 2005-08-18 Juki Corp 軸力測定器具、軸力測定装置及び軸力測定方法
JP2010216804A (ja) * 2007-07-06 2010-09-30 Uchimura:Kk 軸力検出用締結体、締結体ユニット、軸力監視システム
WO2016159245A1 (ja) * 2015-03-31 2016-10-06 株式会社ＮｅｊｉＬａｗ 通電路付部材及び通電路のパターニング方法、部材変化計測方法
JP2019215272A (ja) * 2018-06-13 2019-12-19 株式会社ＮｅｊｉＬａｗ 嵌合構造

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