JP7427220B2 - Load sensing device, metal anchor, network system, anchor system, and control method for load sensing device - Google Patents

Description

The present invention relates to a load detection device, a metal anchor, a network system, an anchor system, and a load detection device that detects the load acting on a metal anchor fixed to a concrete frame, regardless of whether it is pre-installed or retrofitted (post-installation). Regarding control method.

Conventionally, this type of metal anchor has been used as a dowel for fixing a workpiece to the base by being fixed to a fixed bore consisting of a front bore and an enlarged bore formed in a base such as a concrete base. Metal expansion anchors (post-installed anchors) are known (see Patent Document 1).
This dowel includes a fixing bolt having a bolt head, a locking component threaded onto the tip of the fixing bolt, a gap sleeve through which the fixing bolt is inserted, a sleeve component, and an engagement component. The locking component includes a tip member that is screwed into the fixing bolt, and a four-part locking element that has a circumferential groove and is connected to the tip member. The ends of the four locking elements are in contact with engagement parts whose tips are tapered conically.
When the gap sleeve is driven in through the washer attached to the bolt head, the engagement part advances axially through the sleeve part and forces the four locking elements apart. This causes the four locking elements to swing outward around the circumferential groove, ie towards the enlarged bore. Next, when the fixing bolt is rotated to attract the locking parts, the four locking elements abut against the rear surface of the enlarged bore and are locked, while the sleeve part is deformed to collapse and the locking parts are pulled together by the fixing bolt. The workpiece is fixed and crimped onto the base.

Special Publication No. 60-500966

With such conventional dowels (metal expansion anchors), if the enlarged bore is formed with high precision and the effective embedment depth of the dowel is sufficient, the tensile strength of the dowel will be equal to that of concrete, etc. It is not determined by the yield strength determined by cone fracture, but by the tensile strength of the peg itself. That is, the tensile strength of the dowel is determined based on the yield point strength of the fixing bolt. Specifically, the allowable tensile strength is several tens of percent of the yield point strength of the fixing bolt, and the design is based on this allowable tensile strength.
In such cases, if an unexpected load is applied to the fixing bolt through the workpiece due to an earthquake, that is, a load that exceeds the allowable tensile strength, the bolt may break over time. There is a possibility that some kind of trouble will occur in the function of the bolt. For this reason, when inspecting and managing the dowels, it is preferable for the manager to know that an unexpected load has been applied to the fixing bolt, and to investigate the cause of the load.
However, with conventional dowels, there was no way to know that even if an unexpected load was applied, unless the fixing bolt broke or extreme elongation (permanent strain immediately before breakage) occurred.

The present invention provides a load detection device, a metal anchor, and a network system that can detect the load acting on the anchor bolt of a metal anchor fixed to a concrete structure and notify an administrator of information based on the detection result. , an anchor system, and a method for controlling a load sensing device.

The load detection device of the present invention is installed on a metal anchor fixed to a concrete frame in order to support and fix an object to be fixed, and detects the load acting in the axial direction of the anchor bolt of the metal anchor. It is characterized by comprising a detection section that detects a load, and an output section that outputs information based on the detection result of the detection section to an information output device.

The load detection device control method of the present invention is provided on a metal anchor fixed to a concrete frame in order to support and fix an object to be fixed, and detects a load acting in the axial direction of an anchor bolt of the metal anchor. The present invention is a method for controlling a load detection device, and is characterized by executing a detection step of detecting a load, and an output step of outputting information based on the detection result of detecting the load to an information output device.

According to this configuration, the load detection device detects a load acting in the axial direction of the anchor bolt of the metal anchor, and outputs information based on the detection result to the information output device. Thereby, the manager of the metal anchor can know information regarding the load acting on the anchor bolt from the information output device, and can in turn properly inspect and manage the metal anchor.
Note that the metal anchor may be a post-installed anchor (retrofitted) or a pre-installed anchor.

In the load detection device described above, it is preferable that the output unit outputs the number of times the detection unit detects a load exceeding a predetermined load threshold in a predetermined period as information to the information output device.

According to this configuration, the administrator can know the number of times a load exceeding a predetermined load threshold is applied to the anchor bolt in a predetermined period.

In the load detection device described above, the information output device is preferably a display device, and preferably further includes a display device.

According to this configuration, the administrator can know information regarding the load acting on the anchor bolt from the display device provided in the load detection device.
Note that the display device may be a display that displays characters or images, or may be a lighting device such as an LED (Light Emitting Diode) that outputs information in a light emitting state.

In the load sensing device described above, it is preferable that the information output device is an external device, and that the output section includes a communication interface that transmits information to the external device.

According to this configuration, the administrator can obtain information regarding the load acting on the anchor bolt using an external device.
Note that the communication means of the communication interface may be wired communication or wireless communication.

In the load detection device described above, it is preferable that the output unit outputs information to the information output device when the detection unit detects a load that exceeds a predetermined load threshold.

According to this configuration, the administrator can know when an unexpected load is applied to the metal anchor.

In the load sensing device described above, it is preferable that the information output device is an external server connected to the load sensing device via a network, and that the output section includes a communication interface for transmitting information to the external server.

According to this configuration, the administrator can obtain information regarding the load acting on the anchor bolt using the load detection device and the external server connected via the network. In other words, the administrator can grasp the status of the metal anchor at a location away from the installation location of the metal anchor. Furthermore, by connecting multiple load detection devices to an external server over a network, it is possible to collectively manage multiple metal anchors.
Note that the communication means of the communication interface may be wired communication or wireless communication.

In the above load detection device, the metal anchor has a loose fit hole drilled in the axial direction from the base end to the distal end, and the anchor bolt supports and fixes the object to be fixed at the base end, and the loose fit hole The rod-shaped member is loosely fitted and has its tip fixed to the anchor bolt at the back of the loose fit hole, and the load detection device is in contact with the base end of the anchor bolt from the outside. It is preferable that the detection part is provided at the base end of the rod-shaped member and detects a load acting in the axial direction of the anchor bolt.

According to this configuration, the rod-shaped member incorporated in the anchor bolt that supports and fixes the object to be fixed has its distal end fixed to the inner part of the loose fitting hole, and the rod-shaped member provided at the proximal end of the rod-shaped member. The load sensing device is in contact with the base end of the anchor bolt. Therefore, the load detection device can detect the tensile load from the fixed object acting on the anchor bolt, and can output information based on the detection result to the information output device.

The network system of the present invention is characterized in that the load detection device described above and an external server are connected via a network.

According to this configuration, it is possible to construct a network system that allows the administrator to grasp the status of the metal anchors at a location away from the installation location of the metal anchors.
Note that the network system may have a configuration in which a repeater is provided between the load detection device and the external server, or a configuration in which the load detection device and the external server are connected via a plurality of networks.

Anchor system of the present invention A metal anchor provided with the above-mentioned load detection device, and a cone provided in a prepared hole drilled in the concrete frame adjacent to the metal anchor to detect cone-shaped fracture of the concrete frame caused by the metal anchor. An anchor system comprising: a cone-shaped fracture detection device; the cone-shaped fracture detection device is loosely fitted into a pilot hole; , having a sleeve part fixed to the concrete frame on the opening side of the prepared hole, and a fracture detection mechanism part provided at the base end of the rod-shaped anchor in contact with the sleeve part from the outside, The fracture detection mechanism section detects minute outward movement of the sleeve section when a cone-shaped fracture occurs, and transmits information based on the detection result to an information output device or an information output device other than the information output device. It is characterized by output.

The tensile strength of a metal anchor is determined by the strength that leads to cone-shaped failure of the concrete structure or the tensile strength of the anchor bolt. That is, when an excessive tensile load is applied to a metal anchor, a cone-shaped fracture or a bolt failure occurs.
According to this configuration, the load detection device in the metal anchor detects that a predetermined load has been applied to the anchor bolt, that is, that a load that causes elongation has been applied to the anchor bolt. On the other hand, a cone-shaped fracture detection device installed in the concrete frame adjacent to the metal anchor detects that a cone-shaped fracture has occurred within the concrete frame.
In the cone-shaped fracture detection device, the tip of the rod-shaped anchor loosely fitted into the prepared hole is fixed to the concrete frame, and the fracture detection mechanism provided at the base end of the rod-shaped anchor is fixed to the opening side of the prepared hole. It is in contact with the sleeve part fixed to the. Therefore, when a cone-shaped fracture occurs due to a tensile load from an object to be fixed, a bulge occurs on the surface of the concrete frame. The cone-shaped fracture detection device detects minute outward movement of the sleeve portion due to this bulge using the fracture detection mechanism, and outputs the detection result to the information output device. This allows the manager to know that a cone-shaped fracture has occurred in the concrete frame, and more specifically, that a cone-shaped crack has occurred, which is a pre-destruction stage.

It is a structural diagram of a metal anchor. It is an exploded view of the anchor bolt area of a metal anchor. FIG. 1 is a block diagram of a load detection device according to a first embodiment. It is a figure showing an example of information displayed on the load sensing device concerning a 1st embodiment. It is a flowchart which shows the counting process by a load detection device. It is a flowchart which shows the process in response to a user's operation by a load detection device. FIG. 3 is a block diagram of a load detection system according to a second embodiment. FIG. 3 is a diagram showing an example of information displayed on an administrator terminal. It is a flow chart which shows load sensing device side processing by a load sensing device concerning a 2nd embodiment. FIG. 3 is a system configuration diagram of a network system according to a third embodiment. FIG. 7 is a block diagram of a load detection device and a central management server of a network system according to a third embodiment. It is a figure showing an example of information displayed on a central management server concerning a 3rd embodiment. 13 is a flowchart showing central management server-side processing by a central management server according to a third embodiment. FIG. 7 is a structural diagram of an anchor system according to a fourth embodiment. It is an exploded view of the cone-like fracture detection device in the anchor system concerning a 4th embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A load sensing device, a metal anchor, a network system, an anchor system, and a method for controlling a load sensing device according to an embodiment of the present invention will be described below with reference to the accompanying drawings. The load detection device is provided on a metal anchor fixed to a concrete frame in order to support and fix the object to be fixed to the concrete frame. Metal anchors are either pre-installed or post-installed (post-installed) anchors. Further, the load detection device has a function of detecting a tensile load acting on an anchor bolt, which is the main body of a metal anchor, and outputting information indicating the detection result. Note that the load detection device includes a configuration equipped with a display (display device) and a configuration not equipped with a display. The former will be explained in the first embodiment, and the latter will be explained in the second embodiment.

On the other hand, the network system has a configuration in which the load detection device described above and a central management server are connected through a network. The central management server is a server for collectively managing a plurality of metal anchors based on information output from a plurality of load detection devices. The network system will be explained in the third embodiment.

On the other hand, the anchor system consists of a metal anchor equipped with the above-mentioned load detection device and a cone-shaped fracture detection device placed adjacent to the metal anchor, which detects unexpected loads that can cause the anchor bolt to break. It has the function of detecting cone-shaped cracks that lead to cone-shaped failure of concrete structures. The anchor system will be explained in the fourth embodiment.

[First embodiment]
First, the structure of the metal anchor 10 will be explained with reference to FIGS. 1 and 2. FIG. 1 is a structural diagram of the metal anchor 10, and FIG. 2 is an exploded view of the area around the anchor bolt 11 of the metal anchor 10. As shown in both figures, the metal anchor 10 is a so-called post-installed metal expansion anchor (mechanical anchor), and main parts including the anchor bolt 11 are made of steel, stainless steel, or the like.

An anchor hole AH with an enlarged diameter portion AHa formed in the inner part is bored in the concrete body C, and the metal anchor 10 is fixed by being driven into the anchor hole AH. In the metal anchor 10 fixed in the anchor hole AH (concrete body C), the base end of the anchor bolt 11 protrudes from the surface of the concrete body C, and a fixing nut is screwed into this part via a washer W. The base plate Sa of the fixed object S is fastened by N.

The metal anchor 10 includes an anchor bolt 11 having a loose fitting hole 12 drilled in the axial direction from the base end toward the distal end, and a fixing mechanism part that fixes the tip end of the anchor bolt 11 to the enlarged diameter part AHa of the anchor hole AH. It is equipped with 13. The metal anchor 10 is loosely fitted into the loose fitting hole 12, and also has a rod-shaped member 15 whose tip end is fixed to the anchor bolt 11 at the back of the loose fitting hole 12, and a rod-shaped member 15 that is fixed to the anchor bolt 11 from the outside. A load detection device 16 is screwed onto the base end of the rod-shaped member 15 while in contact with the base end surface 11a.

The anchor bolt 11 and the fixing mechanism section 13 have the original anchor function of the metal anchor 10 that supports and fixes the object S to be fixed to the concrete body C. On the other hand, the rod-shaped member 15 and the load detection device 16 have a function unique to this embodiment of detecting that an unexpected load (a load exceeding a predetermined load threshold) is applied to the anchor bolt 11.

The anchor bolt 11 is a fully threaded bolt having the nominal diameter of the metal anchor 10. A loose fitting hole 12 is formed in the axial center of the anchor bolt 11 and extends from the base end toward the distal end. The loose fitting hole 12 has a depth of about 1/4 to 1/2 of the entire length of the anchor bolt 11. The loose fitting hole 12 also includes a hole main body 12a into which the rod-shaped member 15 is loosely fitted, and a proximal accommodation hole portion 12b formed with a larger diameter than the hole main body 12a and in which the load sensing device 16 is accommodated. , a threaded hole portion 12c (female thread) on the tip side, which is formed to have a smaller diameter than the hole main body 12a, and into which the tip of the rod-shaped member 15 is screwed.

Note that the loose fitting hole 12 may extend through the anchor bolt 11 in the axial direction. Further, the anchor bolt 11 may have male threads formed only at the base end and the distal end.

The fixing mechanism section 13 includes an expansion nut 21 screwed onto the tip of the anchor bolt 11, and a driving sleeve 22 disposed to surround the anchor bolt 11. The expansion nut 21 is integrally formed with a nut main body 24 in the lower half shown, which is screwed onto the anchor bolt 11, and an expansion part 25 in the upper half divided into four parts by a slit 25a. A cone portion 26 is formed at the tip of the driving sleeve 22, and by driving the driving sleeve 22, the expanding portion 25 of the expanding nut 21 expands radially outward. The expanded expanded portion 25 expands toward the peripheral wall of the expanded diameter portion AHa and is fixed to the expanded diameter portion AHa. The anchor bolt 11 exhibits a wedge effect due to the cooperation between the expanded portion 25 and the expanded diameter portion AHa.

The rod-shaped member 15 is composed of a fully threaded bolt having a diameter sufficiently smaller than that of the anchor bolt 11. The tip of the rod-shaped member 15 is screwed into the threaded hole 12c of the loose fit hole 12 and fixed to the anchor bolt 11. Further, the base end portion of the rod-shaped member 15 faces the accommodation hole portion 12b of the loose fit hole 12, and a load detection device 16 is screwed into this portion. Although details will be described later, a portion of the load detection device 16 is abutted against the base end surface 11a of the anchor bolt 11 from the outside.

Note that the rod-shaped member 15 may have male threads formed only at the base end and the distal end. Further, the main portion of the rod-shaped member 15 may be formed of a thick wire or the like.

The load detection device 16 has a rectangular parallelepiped device main body 31 that contacts the base end surface 11a of the anchor bolt 11 from the outside, and a connecting portion 32 that is screwed into the base end of the rod-shaped member 15. 31 and the connecting portion 32 are integrally formed. The device main body 31 includes a pressure sensor 52 (see FIG. 3) that measures the value of pressure acting on the anchor bolt 11 in the axial direction. When a load exceeding the allowable tensile load is applied to the anchor bolt 11, the anchor bolt 11 is elongated, and the pressure sensor 52 built into the device main body 31 measures a pressure value exceeding a predetermined pressure threshold. Note that the pressure sensor 52 is an example of a "sensing section".

The device main body 31 is in contact with the proximal end surface 11a of the anchor bolt 11, and the pressure sensor 52 receives the pressing force from the proximal end surface 11a of the anchor bolt 11 and measures the pressure value. Further, the surface of the device main body 31 is exposed to the outside. Therefore, the device main body 31 can be viewed and operated from the outside. Furthermore, a display 54 and operation buttons 55 are arranged on the surface of the device main body 31. The display 54 is an example of an "information output device" and a "display device."

The connecting portion 32 has the form of a so-called cap nut, and is screwed into the base end portion of the rod-shaped member 15 within the accommodation hole portion 12b of the loose fit hole 12. This screwing is to attach the load detection device 16 to the rod-shaped member 15 and to bring the bottom surface of the device main body 31 into contact with the proximal end surface 11a of the anchor bolt 11.

By the way, in this type of metal anchor 10 (expanded bottom anchor), its tensile strength is designed based on the tensile strength (yield strength) based on the yield point strength of the anchor bolt 11. In other words, even if a load that reaches the yield point strength is applied to the anchor bolt 11, the anchor bolt 11 will not break, but if a large load is applied repeatedly (for example, due to vibration) or if a hanging load is applied constantly. etc., it is necessary to take the safety factor into consideration as appropriate. Therefore, for each object S to be fixed, 20 to 100% of the yield point strength is set as the tensile strength of the anchor bolt 11, and the anchor bolt 11 (metal anchor 10) is designed based on this.

The tensile strengths used in design include long-term allowable tensile strength (about 25-30% of yield point strength) and short-term allowable tensile strength (about 40-50% of yield point strength). For example, when the fixed object S has a driving part, the fixed object S is subjected to wind pressure or vibration, or the fixed object S is suspended, it is preferable to consider the long-term permissible tensile strength. Furthermore, if there is a possibility of metal fatigue in the anchor bolt 11 in relation to the object S to be fixed, it is preferable to set the tensile strength of the anchor bolt 11 to 20% of the yield point strength.

In the load detection device 16 of this embodiment, when a load exceeding the long-term allowable tensile strength or the short-term allowable tensile strength is applied to the anchor bolt 11, it is assumed that an unexpected load has been applied, and each load is applied on a two-stage basis. Measure the number of times. More specifically, the load detection device 16 sets the short-term allowable tensile strength as a "first load threshold" and measures the number of times N1 that a load exceeding the first load threshold is detected. Further, the load detection device 16 sets the long-term allowable tensile strength as a "second load threshold" and measures the number of times N2 that a load exceeding the second load threshold is detected. The first load threshold and the second load threshold are examples of "predetermined load thresholds." In the following description, "the number of times N1 that a load exceeding the first load threshold was detected" will be expressed as "the number of times N1 that exceeded the first load threshold" or simply "the number of times N1". Further, "Number of times N2 of detecting a load exceeding the second load threshold" is expressed as "Number of times N2 of detecting a load exceeding the second load threshold" or simply "Number of times N2".

Note that the load detection device 16 estimates the load from the pressure value measured by the pressure sensor 52. Therefore, when the pressure sensor 52 measures a pressure value exceeding the first pressure value, the load detection device 16 determines that a load exceeding the first load threshold has been detected. Similarly, when the pressure sensor 52 measures a pressure value that exceeds the second pressure value (second pressure value < first pressure value), the load detection device 16 determines that a load exceeding the second load threshold has been detected. do. The number of times N1 that the first load threshold value has been exceeded and the number of times N2 that the second load threshold value has been exceeded are displayed on a display 54 provided in the device main body 31.

Here, the construction procedure of the metal anchor 10 will be briefly explained. In this metal anchor 10, the anchor bolt 11 incorporating the rod-shaped member 15 is first inserted into the anchor hole AH, and the driving sleeve 22 is driven in to fix the anchor bolt 11 to the concrete body C. Next, the load detection device 16 is screwed into the base end of the rod-shaped member 15, and the contact pressure of the device body 31 against the base end surface 11a of the anchor bolt 11 is adjusted. Here, the object to be fixed S is brought in, and its base plate Sa is fixed to the surface of the concrete frame C using fixing nuts N. Thereby, the fixed object S is supported and fixed to the concrete frame C via the metal anchor 10.

In this way, when the fixed object S is supported and fixed to the concrete frame C, if an unexpected tensile load is applied to the anchor bolt 11, that is, if unexpected wind pressure or vibration is applied to the fixed object S. When a load exceeding the allowable tensile load is applied to the anchor bolt 11, a slight elongation occurs in the anchor bolt 11.

When the anchor bolt 11 is extended, the device main body 31 is pressed by the proximal end surface 11a of the anchor bolt 11. The load detection device 16 measures this pressing force using a pressure sensor 52 built into the device main body 31.

Next, with reference to FIG. 3, the configuration of the control system of the load sensing device 16A (load sensing device 16) according to the first embodiment will be described. The load detection device 16A includes a control section 51, a pressure sensor 52, a memory 53, a display 54, and an operation button 55 as a control system configuration.

The control section 51 includes a processor such as a CPU (Central Processing Unit), and controls each section of the load detection device 16A. The pressure sensor 52 measures the pressure value caused by the elongation of the anchor bolt 11, as described above. The memory 53 stores the number of times N1 that the first load threshold value has been exceeded and the number of times N2 that the second load threshold value has been exceeded. The display 54 displays these times N1 and N2. The operation button 55 is operated when displaying information on the display 54 or resetting the memory 53. The administrator can display information on the display 54 by pressing the operation button 55 for a short time, and can reset the information stored in the memory 53 by pressing and holding the operation button 55 for a long time.

With the above configuration, the control unit 51 detects the load acting on the anchor bolt 11 based on the pressure value measured by the pressure sensor 52 (detection unit, detection step), and stores the detection result in the memory 53. let Further, the control unit 51 outputs the information stored in the memory 53 to the display 54 based on a short press operation of the operation button 55 (output unit, output step).

FIG. 4 is a diagram showing an example of information displayed on the display 54 of the load detection device 16A. The figure shows that a load exceeding the first load threshold was detected twice and a load exceeding the second load threshold was detected between the time the memory 53 was reset last time and the display 54 was displayed this time. A display example is shown when the detection is performed 50 times. Note that the period from when the memory 53 was last reset to when the display 54 is displayed this time is an example of a "predetermined period."

FIG. 5 is a flowchart showing the counting process by the load detection device 16A. The flowchart in the figure is a process that is periodically and repeatedly executed. The load detection device 16A determines whether a load exceeding the first load threshold is detected based on the measurement result of the pressure sensor 52 (S01). If the load detection device 16A determines that a load exceeding the first load threshold has been detected (S01: Yes), it counts up the number N1 of times the first load threshold has been exceeded, which is stored in the memory 53 (S02). On the other hand, when the load detection device 16A determines that a load exceeding the first load threshold has not been detected (S01: No), the process proceeds to S03.

Subsequently, the load detection device 16A determines whether or not a load exceeding the second load threshold is detected based on the measurement result of the pressure sensor 52 (S03). When the load detection device 16A determines that a load exceeding the second load threshold has been detected (S02: Yes), the load detection device 16A counts up the number of times N2 that the second load threshold has been exceeded, which is stored in the memory 53 (S04). On the other hand, if the load detection device 16A determines that it has not detected a load exceeding the second load threshold (S03: No), it ends the counting process.

FIG. 6 is a flowchart showing a process performed by the load detection device 16A in response to a user operation. The flowchart in the figure is a process executed when the operation button 55 is operated. The load detection device 16A determines whether the operation button 55 has been pressed briefly (S11). Note that the "short press" refers to a press operation in which the operation button 55 is pressed for a duration of time T1 or longer than time T2 (time T2>time T1). When the load detection device 16A determines that the operation button 55 has been pressed briefly (S11: Yes), the load detection device 16A detects the information stored in the memory 53, that is, the number of times the first load threshold has been exceeded N1 and the number of times the second load threshold has been exceeded. The number of times N2 is displayed on the display 54 (S12). On the other hand, when the load detection device 16A determines that the operation button 55 is not pressed briefly (S11: No), the process proceeds to S13.

Subsequently, the load detection device 16A determines whether or not the operation button 55 has been pressed for a long time (S13). Note that "long press" refers to a press operation in which the press duration time of the operation button 55 exceeds the time T2. When the load detection device 16A determines that the operation button 55 has been pressed for a long time (S13: Yes), the load detection device 16A resets the information stored in the memory 53, that is, the number of times N1 and the number of times N2 (S14). "Resetting" refers to returning the count values of N1 and N2 to zero. On the other hand, if the load detection device 16A determines that the operation button 55 is not pressed for a long time (S13: No), that is, if the duration of pressing the operation button 55 is less than the time T1, the load detection device 16A ends the process for the user operation. .

The administrator who confirms the information displayed on the display 54 by pressing the operation button 55 takes the following countermeasures, for example. First, the cause of the unexpected load acting on the metal anchor 10 (anchor bolt 11) is investigated and efforts are made to eliminate it. If the cause can be resolved and the number of times N1 of exceeding the first load threshold and the number of times N2 of exceeding the second load threshold are equal to or less than the expected values, the memory 53 is reset. On the other hand, if the number of times N1 and N2 exceed the expected values, the administrator replaces the metal anchor 10.

As described above, the load detection device 16A according to the first embodiment detects the load acting in the axial direction of the anchor bolt 11 of the metal anchor 10, and displays information based on the detection result on the display 54. Thereby, the administrator can properly inspect and manage the metal anchor 10, and can further ensure the soundness of the metal anchor 10.

Note that the following modifications can be adopted in the first embodiment.
In the first embodiment, the first load threshold was set as the short-term allowable tensile strength, and the second load threshold was set as the short-term allowable tensile strength, but values unrelated to each strength are set as the first load threshold and the second load threshold. You may. In addition, three or more types of thresholds (predetermined load thresholds) are provided instead of two types: the number of times the first load threshold is exceeded N1 and the number of times the second load threshold is exceeded N2, and the load that exceeds each threshold is The number of times of detection may be measured. However, the predetermined load threshold value is preferably a load of 20 to 100% of the yield point strength of the anchor bolt 11.

In addition, in the process for the user operation according to the first embodiment (see FIG. 6), when the display operation on the display 54 is performed (see S11), since the previous memory 53 reset operation was performed, the current display 54 is Although the number of times N1 and N2 were detected until the display operation was performed is displayed (see S12), the number of times N1 and N2 were detected during the fixed period (for example, the past month or the past year from the time the display operation was performed) is displayed. The number of times N1 and N2 have been detected may be displayed. Alternatively, the configuration may be such that the reset means for the memory 53 is not provided, and the display 54 displays the number N1 and the number N2 of detections after the start of detection by the load detection device 16A (when the metal anchor 10 is installed).

Further, although the load detection device 16A according to the first embodiment detects the load acting on the metal anchor 10 based on the measurement result of the pressure sensor 52, The load acting on the anchor 10 may also be detected. For example, the load detection device 16A measures the elongation of the anchor bolt 11 due to a load exceeding the allowable tensile load acting on the anchor bolt 11, and based on the amount of elongation (the amount of change in the length of the anchor bolt 11). , the load acting on the metal anchor 10 may be detected. Alternatively, a load cell or a weight sensor may be used to detect the load acting on the metal anchor 10.

Further, although the load detection device 16A according to the first embodiment includes the display 54, a lighting device such as an LED that outputs information in a light emitting state may be used as the “display device”. In this case, the load detection device 16A is provided with a first LED indicating the number of times N1 and a second LED indicating the number of times N2, and the number of times each LED blinks when the operation button 55 is pressed is the number of times N1 and N2. may be displayed.

[Second embodiment]
Next, a load detection device 16B according to a second embodiment will be described with reference to FIGS. 7 to 9. The load detection device 16B according to this embodiment has a configuration in which a display 54 and operation buttons 55 are omitted, and a communication interface 56 is added, compared to the load detection device 16A according to the first embodiment. Further, information based on the detection results of the load detection device 16B (number of times N1 and number of times N2) is displayed on the administrator terminal 100 that can communicate with the load detection device 16B. The administrator terminal 100 is assumed to be a tablet terminal that the administrator carries when inspecting the metal anchor 10. The administrator terminal 100 is an example of an "external device." Hereinafter, only the points different from the first embodiment will be explained. In addition, in this embodiment, the same reference numerals are attached to the same components as in the first embodiment, and detailed description thereof will be omitted. Furthermore, the modifications applied to the same components as in the first embodiment are also applied to this embodiment.

FIG. 7 is a block diagram of the load detection system SY2 according to this embodiment. The load detection system SY2 includes a load detection device 16B and an administrator terminal 100. The load detection device 16B includes a control section 51, a pressure sensor 52, a memory 53, and a communication interface 56 as a control system configuration. The communication interface 56 is an example of an "output section." The communication interface 56 communicates with the administrator terminal 100 via wireless communication or wired communication.

On the other hand, the administrator terminal 100 includes a control section 111, a storage section 112, a communication interface 113, and a touch panel 114 as a control system configuration.

The control unit 111 includes a processor and controls each part of the administrator terminal 100. The storage unit 112 stores various programs and data including the management application 61. The management application 61 communicates with the load detection device 16B, displays the information acquired from the load detection device 16B (number of times N1 and number of times N2) on the touch panel 114, and displays information acquired from the load detection device 16B on the touch panel 114, This is an application for determining whether or not repair of the anchor 10 is necessary. The communication interface 113 communicates with the load detection device 16B. The touch panel 114 is used to display various information and perform various operations.

FIG. 8 is a diagram showing an example of information displayed on the touch panel 114 of the administrator terminal 100. The figure shows a display example of the first load detection result screen D1 that displays information acquired from the load detection device 16B. When the administrator performs a predetermined operation on the touch panel 114 of the administrator terminal 100, the administrator terminal 100 transmits an information transmission command to the load detection device 16B. In response to this information transmission command, the load detection device 16B transmits the information (number of times N1 and number of times N2) stored in the memory 53 to the administrator terminal 100.

Upon acquiring the information from the load detection device 16B, the administrator terminal 100 displays the first load detection result screen D1. The first load detection result screen D1 displays "load detection device ID", "measurement value", and "correspondence" in association with each other. Here, the "load detection device ID" is identification information for specifying the load detection device 16B. Although not particularly illustrated, a label on which a load detection device ID is printed is affixed to the surface (the surface visible from the outside) of the device main body 31 of the load detection device 16B. When the administrator terminal 100 can simultaneously communicate via wireless communication with a plurality of load detection devices 16B provided on a plurality of metal anchors 10, the administrator uses the load detection device ID to The information displayed on the load detection result screen D1 is associated with the load detection device 16B. FIG. 8 shows a display example when the administrator terminal 100 acquires information from one load detection device 16B.

Moreover, the "measured value" indicates the number of times N1 that the first load threshold value was exceeded and the number of times N2 that the second load threshold value was exceeded, which were measured by the load detection device 16B. In addition, "Response" displays the words "Repair required" if at least one of the number of times N1 and N2 exceeds the expected value, and displays the words "Repair not required" if the number does not exceed the expected value. . Note that the control unit 321 determines whether at least one of the number of times N1 and the number of times N2 exceeds an expected value based on the management application 61.

FIG. 9 is a flowchart showing load sensing device side processing by the load sensing device 16B according to this embodiment. It is assumed that the load detection device 16B periodically performs a counting process (see FIG. 5). The flowchart shown in FIG. 9 is a process executed when the load detection device 16B receives a command from the administrator terminal 100.

The load detection device 16B determines whether an information transmission command has been obtained from the administrator terminal 100 (S21). When the load detection device 16B determines that the information transmission command has been acquired from the administrator terminal 100 (S21: Yes), the load detection device 16B transmits the information (number of times N1 and number of times N2) stored in the memory 53 to the administrator terminal 100. Send (S22). On the other hand, when the load detection device 16B determines that the information transmission command has not been acquired from the administrator terminal 100 (S21: No), the process proceeds to S23.

Subsequently, the load detection device 16B determines whether a reset command has been obtained from the administrator terminal 100 (S23). When the administrator performs a reset operation on the touch panel 114, the administrator terminal 100 transmits this reset command to the load detection device 16B. If the load detection device 16B determines that the reset command has been obtained from the administrator terminal 100 (S23: Yes), it resets the information stored in the memory 53 (S24). Moreover, when the load detection device 16B determines that the reset command has not been acquired from the administrator terminal 100 (S23: No), the load detection device side process is ended.

As explained above, according to the load detection device 16B according to the second embodiment, since it is not necessary to provide a display function and an operation function, the device configuration can be simplified, and the cost of the load detection device 16B can be reduced. can. In addition, when the administrator terminal 100 includes multiple load sensing devices 16B within its communicable range, the administrator can simultaneously send an information transmission command to the multiple load sensing devices 16B. The metal anchor 10 can be inspected quickly.

Note that in the second embodiment, the following modifications can be adopted.
In the second embodiment, the administrator terminal 100 is a tablet terminal equipped with a touch panel 114, but an information processing terminal equipped with a display and an operation function may be used as the administrator terminal 100. Furthermore, an information processing terminal equipped with a telephone call function, such as a smartphone, may be used as the administrator terminal 100.

[Third embodiment]
Next, a network system SY3 according to a third embodiment will be described with reference to FIGS. 10 to 13. Network system SY3 enables inspection of metal anchor 10 at a location away from the installation location of metal anchor 10. Also in this embodiment, like the second embodiment, the same components as in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. Furthermore, the modifications applied to the same components as in the first embodiment are also applied to this embodiment.

FIG. 10 is a system configuration diagram of the network system SY3 according to this embodiment. The network system SY3 includes one or more load detection devices 16C, a repeater 310, and a central management server 320. Central management server 320 is an example of an "external server."

The load detection device 16C and the repeater 310 are connected via wireless communication or wired communication. Furthermore, the repeater 310 and the central management server 320 are connected via the Internet communication network NW. The Internet communication network NW is an example of a "network". Note that the load detection device 16C and the repeater 310 may be connected via a wireless network or a wired network. Further, the repeater 310 and the central management server 320 may be connected not only through the Internet communication network NW but also through a network such as an in-house LAN.

One or more load detection devices 16C are provided on different metal anchors 10, respectively, and detect the load acting on the anchor bolt 11 of each metal anchor 10. The central management server 320 centrally manages one or more load detection devices 16C. Note that all of the one or more load detection devices 16C do not necessarily need to be connected to one repeater 310, and may be configured to be connected to different repeaters 310, respectively.

FIG. 11 is a block diagram of the load detection device 16C and the central management server 320 of the network system SY3 according to the present embodiment. The configuration of the control system of the load detection device 16C according to this embodiment is the same as that of the load detection device 16B according to the second embodiment. However, the communication interface 56 of the load detection device 16C according to this embodiment communicates with the central management server 320 via the repeater 310. Furthermore, it is assumed that the load detection device 16C according to this embodiment does not have a reset function for the memory 53.

The centralized management server 320 includes a control section 321, a storage section 322, a communication interface 323, and a display 324 as a control system configuration.

The control unit 321 includes a processor and controls each part of the central management server 320. The storage unit 322 stores the management application 61 and has a count value area 62. The management application 61 displays the information (number of times N1 and number of times N2) acquired from the load detection device 16C on the display 324, and determines whether or not repair of the metal anchor 10 is necessary based on the information acquired from the load detection device 16C. This is an application for making identification. Further, the count value area 62 is an area that stores the number of times N1 and the number of times N2 for each load sensing device 16C (for each load sensing device ID). On the other hand, the communication interface 113 communicates with the load detection device 16C via the repeater 310. The display 324 displays various information.

FIG. 12 is a diagram showing an example of information displayed on the display 324 of the central management server 320 according to this embodiment. The central management server 320 displays the second load detection result screen D2 shown in the figure based on the information acquired from the load detection device 16C. The second load detection result screen D2 displays "load detection device ID", "installation location", "measurement value", and "response" in association with each other. The "load detection device ID", "measurement value", and "response" are the same as those on the first load detection result screen D1 (see FIG. 8).

“Installation location” is information indicating the installation location of the load detection device 16C, that is, the installation location of the metal anchor 10. The “installation location” is information that is stored in a predetermined area in the storage unit 322 in association with the “load detection device ID”. That is, when the central management server 320 acquires information from the load detection device 16C, the central management server 320 stores information indicating the “installation location” linked to the “load detection device ID” of the load detection device 16C in a predetermined location in the storage unit 322. The read information is displayed in the "Installation location" column of the second load detection result screen D2.

FIG. 13 is a flowchart showing central management server side processing by the central management server 320 according to this embodiment. Note that the load detection device 16C periodically performs counting processing (see FIG. 5), and when a change occurs in the count value (when a load exceeding a predetermined load threshold is detected), the load detection device 16C performs counting processing (refer to FIG. and the number of times N2) are transmitted to the central management server 320. The flowchart shown in FIG. 13 is a process that is periodically executed when the centralized management server 320 is in a state where it can acquire information from the load detection device 16C (when the management application 61 is activated).

The centralized management server 320 determines whether information has been acquired from the load detection device 16C (S31). When the centralized management server 320 determines that the information has not been acquired from the load detection device 16C (S31: No), the centralized management server side processing ends. On the other hand, when the centralized management server 320 determines that the information has been acquired from the load detection device 16C (S31: Yes), it updates the information in the count value area 62 based on the acquired information (S32). That is, the number of times N1 and the number of times N2 linked to the load sensing device ID of the load sensing device 16C that acquired the information is updated.

Subsequently, the centralized management server 320 determines whether the count value (at least one of the number of times N1 and the number of times N2) exceeds an expected value (S33). If the central management server 320 determines that the count value exceeds the expected value (S33: Yes), it issues a repair instruction to a vendor server (not shown) of a vendor that repairs the metal anchor 10 (S34). Although not shown in the flowchart, when the central management server 320 determines that the count value exceeds the expected value (S33: Yes), the central management server 320 displays the "Response" column on the second load detection result screen D2 (see FIG. 12). ``Repair required'' is displayed on the screen.

As described above, according to the network system SY3 according to the third embodiment, the administrator can use the central management server 320 to obtain information regarding the load acting on the anchor bolt 11 of the metal anchor 10. In other words, the administrator can know the information even if the administrator is away from the installation location of the metal anchor 10. Moreover, since the centralized management server 320 can be connected to a plurality of load detection devices 16C, it is possible to collectively manage a plurality of metal anchors 10. Furthermore, when the centralized management server 320 determines that the metal anchor 10 requires repair based on the information acquired from the load detection device 16C, the central management server 320 sends a message to the vendor server of the vendor who repairs the metal anchor 10. Since a repair instruction is given immediately, the metal anchor 10 can be repaired quickly. Thereby, destruction of the metal anchor 10 (fracture of the anchor bolt 11) can be effectively prevented.

Note that in the third embodiment, the following modifications can be adopted.
The load detection device 16C according to the third embodiment transmits the count value to the central management server 320 when a change occurs in the count value (when a load exceeding a predetermined load threshold is detected). The information stored in the memory 53 may be sent to the central management server 320 periodically (once a day, once an hour, etc.). Further, similarly to the load detection device 16B according to the second embodiment, the load detection device 16C according to the third embodiment also receives the information stored in the memory 53 when acquiring the information transmission command from the central management server 320. It may be configured to reply.

[Fourth embodiment]
Next, an anchor system 80 according to a fourth embodiment will be described with reference to FIGS. 14 and 15. Also in this embodiment, the same reference numerals are given to the same components as in each of the above-described embodiments, and detailed description thereof will be omitted. FIG. 14 is a structural diagram of the anchor system 80 of this embodiment, and FIG. 15 is an exploded view of the cone-shaped fracture detection device 90 in the anchor system 80.

As shown in both figures, the anchor system 80 includes the metal anchor 10 described above and a cone-shaped fracture detection device 90 provided in the concrete frame C adjacent to the metal anchor 10. This cone-shaped fracture detection device 90 uses the metal anchor 10 to detect the occurrence of cone-shaped fracture in the concrete frame C, specifically, the occurrence of a cone-shaped crack that is a pre-destruction stage. Note that the description of the metal anchor 10 is left above, and here, the cone-shaped fracture detection device 90 will be mainly described.

The cone-shaped fracture detection device 90 is provided in a pilot hole BH bored in the concrete body C adjacent to the metal anchor 10. The pilot hole BH, which is bored adjacent to and parallel to the anchor hole AH, has approximately the same diameter as the loose fitting hole 12 and is formed to have approximately the same length as the anchor hole AH. In addition, the prepared hole BH consists of a long straight hole portion BHa forming the main body and a short fixing hole portion BHb on the opening side, and on the same axis, the straight hole portion BHa and the fixing hole portion BHb form an annular stepped portion BHd. exist and communicate.

On the other hand, the base plate Sa of the fixed object S is formed with a circular opening Saa into which a sleeve portion 92 of a cone-shaped fracture detection device 90, which will be described later, is loosely inserted. The cone-shaped fracture detection device 90 has a similar form to the rod-shaped member 15 and the load detection device 16 in the metal anchor 10, and its main components are made of steel, stainless steel, or the like.

The cone-shaped fracture detection device 90 includes a rod-shaped anchor 91 that is fixed to the concrete body C while being inserted into the prepared hole BH, and a sleeve portion 92 that is fixed to the concrete body C in the fixing hole portion BHb of the prepared hole BH. A fracture detection mechanism section 93 is provided at the proximal end of the rod-shaped anchor 91 in contact with the sleeve section 92 from the outside.

Similar to the rod-shaped member 15 described above, the rod-shaped anchor 91 includes an anchor body 95 composed of a fully threaded bolt, and a tip of the anchor body 95 that is inserted into the concrete frame at the innermost part of the prepared hole BH (straight hole portion BHa). Anchor fixing section 96 for fixing to C. An anchor fixing section 96 is screwed into the distal end of the anchor body 95, and a destruction detection mechanism section 93 located within the sleeve section 92 is screwed into the proximal end.

The anchor fixing part 96 has an expanded part 101a on the distal end side, a cylindrical body 101 whose proximal end is screwed into the anchor body 95, an expansion collar 102 inserted into the cylindrical body 101, and an expansion collar 102 that is inserted into the cylindrical body 101 by driving. It has an expansion cone 103 that expands the expansion part 101a via the expansion cone 103 (see FIG. 15). In this anchor fixing section 96, the cylindrical main body 101 incorporating the expansion collar 102 and the expansion cone 103 is inserted into the innermost part of the prepared hole BH, and the expansion cone 103 is driven in using a driving rod.

When the expansion cone 103 is driven in, the expansion collar 102 expands, and the expanded expansion collar 102 causes the expansion portion 101a of the cylindrical main body 101 to expand. The expanded portion 101a that spreads outward is pressed against the circumferential surface of the prepared hole BH, and the cylindrical main body 101 is fixed in the innermost part of the prepared hole BH. Then, the distal end portion of the anchor body 95 is screwed into the fixed cylindrical body 101 (anchor fixing portion 96). Note that in order to ensure the fixation of the cylindrical body 101 and to ensure that the tip of the anchor body 95 is adhered to the cylindrical body 101 (to prevent loosening), an adhesive (not shown) is applied to the innermost part of the prepared hole BH in advance. (omitted) is preferably injected.

The sleeve portion 92 is made of steel, stainless steel, or the like, and is fixed in the fixing hole portion BHb of the prepared hole BH with the destruction detection mechanism portion 93 accommodated therein. A male screw 92a or a ring-shaped unevenness is formed on the outer peripheral surface of the sleeve portion 92 (the illustrated one is a male screw 92a: see FIG. 15), and the lower half thereof as shown in the figure is driven into the fixing hole BHb. Then, the sleeve portion 92 is fixed to the concrete body C. Further, in this state, the sleeve portion 92 penetrates the base plate Sa at the circular opening Saa and protrudes from the surface of the base plate Sa.

The destruction detection mechanism section 93 has the same form as the load detection device 16 described above. That is, the destruction detection mechanism section 93 has a device main body 116 and a connection section 117, and the device main body 116 is provided with a display 154 and an operation button 155. Further, the device main body 116 includes a control section, a pressure sensor, and a memory (all not shown). Then, the fracture detection mechanism section 93 detects that cone-shaped fracture (cone-shaped crack) has occurred in the concrete frame C.

Specifically, when the surface of the concrete body C rises, the sleeve portion 92 fixed thereto slightly moves outward, and the base end surface 92b of the sleeve portion 92 presses the device main body 116. The destruction detection mechanism section 93 measures this pressing force using a pressure sensor built into the device main body 116. Furthermore, when the pressure sensor measures a pressure value that exceeds a predetermined pressure threshold, the fracture detection mechanism section 93 determines that the sleeve section 92 has moved beyond a predetermined movement amount threshold, and prevents the occurrence of cone-shaped fracture. Detect. Furthermore, when detecting the occurrence of a cone-shaped fracture, the fracture detection mechanism section 93 stores the detection date and time in the memory. Further, the fracture detection mechanism section 93 displays information stored in the memory (that the occurrence of cone-shaped fracture has been detected, and the date and time of detection) on the display 154 based on a display operation using the operation button 155.

As described above, according to the anchor system 80 according to the present embodiment, when a load that exceeds expectations, that is, a load that exceeds the allowable tensile load is applied to the anchor bolt 11, the load detection device 16 detects this and The detection results are displayed on the display 54. On the other hand, when a cone-shaped crack occurs in the concrete body C, the fracture detection mechanism section 93 of the cone-shaped fracture detection device 90 detects this and displays the detection result on the display 154. With these, the administrator can properly inspect and manage the metal anchor 10, and effectively prevent the destruction of the metal anchor 10 (fracture of the anchor bolt 11 and cone-shaped failure of the concrete frame C). Can be done.

Note that, as described above, since the destruction detection mechanism section 93 and the load detection device 16 have the same form, each configuration of the load detection device 16 in the second embodiment and subsequent embodiments is used as the destruction detection mechanism section 93. Needless to say, it is applicable.

For example, when the destruction detection mechanism section 93 has the configuration of the load detection device 16B according to the second embodiment, the cone-shaped fracture detection device 90 (fracture detection mechanism section 93) detects the It is preferable that information indicating the results be transmitted, and that the administrator terminal 100 display the information acquired from the load detection device 16B and the information acquired from the cone-shaped fracture detection device 90 on the same screen. Further, in this case, it is preferable that the administrator terminal 100 determines whether or not repair of the metal anchor 10 is necessary based on information acquired from the load detection device 16B and the cone-shaped fracture detection device 90.

Further, when the destruction detection mechanism section 93 has the configuration of the load detection device 16C according to the third embodiment, the cone-shaped fracture detection device 90 (fracture detection mechanism section 93) detects It is preferable that information indicating the results is transmitted, and that the central management server 320 displays the information acquired from the load detection device 16C and the information acquired from the cone-shaped fracture detection device 90 on the same screen. In this case, the centralized management server 320 determines whether or not the metal anchor 10 needs to be repaired based on information acquired from the adjacent metal anchor 10 (load detection device 16C) and the cone-shaped fracture detection device 90. It is preferable to make the determination based on

Although four embodiments have been described above, the load detection device 16 (16A, 16B, 16C), cone-shaped fracture detection device 90, administrator terminal 100, and central management server 320 shown in each embodiment and each modification example are A method for executing each process, a program (management application 61) for executing each process, and a computer-readable recording medium on which the program is recorded are also included in the scope of the present invention. Other changes may be made as appropriate without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10... Metal anchor, 11... Anchor bolt, 12... Loose fitting hole, 12a... Hole body, 12b... Accommodation hole part, 12c... Screw hole part, 13... Fixing mechanism part, 15... Rod-shaped member, 16... Load detection Device, 21... Expanding nut, 24... Nut body, 25... Expanding part, 26... Cone part, 31... Device main body, 32... Connection part, AH... Anchor hole, AHa... Expanding diameter part, C... Concrete frame, S...Fixed object, Sa...Base plate

Claims (5)

An anchor bolt having a loose fitting hole drilled in the axial direction from the base end to the distal end, at which an object to be fixed is supported and fixed at the base end; a rod-shaped member whose tip end is fixed to the anchor bolt in the inner part, and a base end of the rod-shaped member of a metal anchor fixed to a concrete frame for supporting and fixing the object to be fixed; A load sensing device provided in contact with the base end of the anchor bolt from the outside ,
a detection unit that detects a load acting in the axial direction of the anchor bolt ;
A load detection device comprising: an output section that outputs information based on a detection result of the detection section to an information output device. A metal anchor fixed to a concrete frame for supporting and fixing an object to be fixed,
An anchor bolt having a loose fitting hole drilled in the axial direction from the base end to the distal end, and at the base end of which the object to be fixed is supported and fixed;
a rod-shaped member that is loosely fitted into the loose fit hole and whose tip end is fixed to the anchor bolt at a deep part of the loose fit hole;
The rod-shaped member is provided at the base end of the rod-shaped member in contact with the base end of the anchor bolt from the outside, detects a load acting in the axial direction of the anchor bolt, and is based on the detection result of the load. A metal anchor comprising: a load detection device that outputs information to an information output device. The load detection device according to claim 1 ;
A network system comprising : an external server that functions as the information output device and is connected to the load detection device via a network . The metal anchor provided with the load sensing device according to claim 1 ;
An anchor system comprising: a cone-shaped fracture detection device that is provided in a pilot hole drilled in the concrete frame adjacent to the metal anchor and detects cone-shaped fracture of the concrete frame caused by the metal anchor,
The cone-shaped fracture detection device includes:
a rod-shaped anchor that is loosely fitted into the prepared hole and whose tip end is fixed to the concrete frame at the innermost part of the prepared hole;
a sleeve portion fixed to the concrete frame on the opening side of the prepared hole;
a destruction detection mechanism provided at the proximal end of the rod-shaped anchor in contact with the sleeve from the outside;
The fracture detection mechanism section detects a slight outward movement of the sleeve section when the cone-shaped fracture occurs, and transmits information based on the detection result to the information output device or to a device other than the information output device. An anchor system characterized by outputting to an information output device. An anchor bolt having a loose fitting hole drilled in the axial direction from the base end to the distal end, at which an object to be fixed is supported and fixed at the base end; a rod-shaped member whose tip end is fixed to the anchor bolt in the inner part, and a base end of the rod-shaped member of a metal anchor fixed to a concrete frame for supporting and fixing the object to be fixed; A method for controlling a load detection device provided in contact with a proximal end of the anchor bolt from the outside ,
a detection step of detecting a load acting in the axial direction of the anchor bolt ;
A method for controlling a load sensing device, comprising: outputting information based on a result of sensing the load to an information output device.

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