Heights Work Safety Management System

Abstract

To safely perform a high-place work by preventing forgetting to hook a safety belt during the high-place work even when the work is performed on a plurality of floors.SOLUTION: A floor where a worker is located is estimated based on an atmospheric pressure detection value output from a worker-side atmospheric pressure sensor, an atmospheric pressure detection value output from a first reference atmospheric pressure sensor, and an atmospheric pressure detection value output from a second reference atmospheric pressure sensor. When it is determined that the worker is in a high place and when it is detected that a hook is not hung on a fall prevention member, an unsafe state is notified.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a safety management system for working at height, which is used, for example, in construction work, maintenance and inspection work, etc., of various buildings. [Background technology]

[0002] For example, Patent Document 1 discloses a maintenance and inspection support system used in elevator maintenance and inspection work. The maintenance and inspection support system of Patent Document 1 includes a mobile terminal carried by a maintenance worker, and this mobile terminal has a built-in air pressure sensor. This maintenance and inspection support system is configured to calculate the difference in altitude between the position of the mobile terminal and the reference floor based on the difference between the atmospheric pressure value detected by the air pressure sensor and the atmospheric pressure value at a preset reference floor, and if the difference in altitude is equal to or less than a predetermined value, to move the elevator car to the reference floor and display on the display device a message informing the user that maintenance and inspection work will be performed.

[0003] Patent Document 2 also discloses a high-altitude work estimation device. This high-altitude work estimation device also includes a mobile terminal carried by the worker. The mobile terminal has a built-in air pressure sensor and an acceleration sensor. The high-altitude work estimation device acquires air pressure information indicating the air pressure information of the location where the worker is present by the air pressure sensor, and if the difference between the acquired air pressure information and the reference air pressure exceeds a predetermined threshold, it determines that the worker is at a high altitude, and if the difference does not exceed the threshold, it determines that the worker is not at a high altitude. Furthermore, the high-altitude work estimation device determines whether the worker is performing work based on the acceleration information acquired by the acceleration sensor. Then, only when the worker is at a high altitude and performing work, a warning such as an alert or vibration is output to the mobile terminal or the supervisor terminal. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-165521 A [Patent Document 2] Patent No. 6684863 Summary of the Invention [Problem to be solved by the invention]

[0005] By the way, there are many situations where working at height is required in the construction work, maintenance and inspection work, etc. of various buildings. Generally, workers wear safety belts, but if they do not hook up when working at height, it is not possible to prevent a fall accident in advance.

[0006] In this regard, in Patent Document 1, an air pressure sensor built into a portable terminal carried by a maintenance worker is used to detect the difference in altitude between the position of the portable terminal and the reference floor. However, the detection results are simply used to control the display device to display a message informing passengers that the car will be moved or that maintenance and inspection work will be carried out, and are not used to prevent falls.

[0007] In addition, in Patent Document 2, a warning is output only when a worker is at a high altitude and performing work, so even if the worker is performing work at a high altitude correctly by hooking the safety belt to a handrail or the like, a warning is output each time, and the warning may be considered to be annoying. In addition, in Patent Document 2, when the worker is not moving, the acceleration is 0, so it is determined that the worker is not performing work, and as a result, a warning is not output even if the worker is at a high altitude. However, even if the worker is not performing work, if the worker is at a high altitude, the safety belt hook must be attached, and the device in Patent Document 2 cannot handle such cases.

[0008] In addition, in Patent Documents 1 and 2, the difference in altitude between the worker and the reference floor is detected by a barometric pressure sensor. For example, if work is performed on the first and second floors, the worker can be judged as working at a high altitude without any problems when working on the first floor, but when the worker moves to the second floor and works, the worker may be judged as working at a high altitude and be subject to a warning even though the work is not actually working at a high altitude. In order to avoid this, the system can be operated separately for each floor, but when the worker works on different floors, the worker needs to change the mobile device for each floor, which makes it difficult to use. In addition, if the worker forgets to change the mobile device and moves to a higher floor, a false warning may be issued, and further, if the worker forgets to change the mobile device and moves to a lower floor, the worker may be judged as not working at a high altitude even though the work is actually being performed.

[0009] The present invention has been made in consideration of the above points, and its purpose is to enable working at heights to be performed safely by preventing workers from forgetting to fasten their safety belts when working at heights, even when work is being performed on multiple floors. [Means for solving the problem]

[0010] In order to achieve the above object, a first aspect of the present disclosure can be premised on a high-altitude work safety management system that manages a worker wearing a safety belt and working at a height. The high-altitude work safety management system includes a hook state detection sensor that is provided on a hook of the safety belt and detects whether the hook is hooked on a fall prevention member that prevents the worker from falling, a worker-side atmospheric pressure sensor that is attached to the worker and detects atmospheric pressure around the worker, a first reference atmospheric pressure sensor that is configured separately from the worker-side atmospheric pressure sensor and installed on a specified floor and detects atmospheric pressure at a reference height that is a reference for determining whether the worker is at a high altitude on the specified floor, a second reference atmospheric pressure sensor that is configured separately from the worker-side atmospheric pressure sensor and the first reference atmospheric pressure sensor and installed on a floor different from the specified floor and detects atmospheric pressure at a reference height that is a reference for determining whether the worker is at a high altitude on the other floor, and a detection value of atmospheric pressure output from the worker-side atmospheric pressure sensor. The device is equipped with an estimation unit that estimates the floor on which a worker is located based on the detected atmospheric pressure value output from the first reference atmospheric pressure sensor and the detected atmospheric pressure value output from the second reference atmospheric pressure sensor; a notification unit that notifies the worker that working at a height is in an unsafe state; and a control unit that determines whether the worker is at a height that is higher than the reference height on the floor estimated by the estimation unit based on the difference between the detected atmospheric pressure value output from the worker-side atmospheric pressure sensor and the detected atmospheric pressure value output from the reference atmospheric pressure sensor installed on the floor estimated by the estimation unit, and when it is determined that the worker is at a high altitude on the floor estimated by the estimation unit and when the hook state detection sensor detects that the hook is not in a state where it is hooked on the fall prevention member, controls the notification unit to notify the worker that it is in an unsafe state.

[0011] According to this configuration, when the first reference atmospheric pressure sensor is installed, for example, on the first floor and the second reference atmospheric pressure sensor is installed, for example, on the second floor, the atmospheric pressure at the reference height that is the reference for determining whether or not the worker is at a high place on the first floor is detected by the first reference atmospheric pressure sensor, and the atmospheric pressure at the reference height that is the reference for determining whether or not the worker is at a high place on the second floor is detected by the second reference atmospheric pressure sensor. The estimation unit can estimate the floor on which the worker is located based on the detected value of atmospheric pressure output from the worker-side atmospheric pressure sensor, the detected value of atmospheric pressure at the reference height on the first floor, and the detected value of atmospheric pressure at the reference height on the second floor. For example, if the detected value of atmospheric pressure output from the worker-side atmospheric pressure sensor is higher than the detected value of atmospheric pressure at the reference height on the second floor by a certain value or more, it can be estimated that the worker is not on the second floor and is on the first floor. Conversely, if the detected atmospheric pressure value output from the worker's side atmospheric pressure sensor is lower than a certain value compared to the detected atmospheric pressure value at the reference height of the second floor, it means that the worker is not on the first floor and it can be presumed that he is on the second floor.

[0012] After estimating the floor where the worker is located in this way, if the worker is at a high place (for example, 2 m or more from the reference height), the atmospheric pressure value output from the worker-side atmospheric pressure sensor will be lower than the atmospheric pressure value output from the reference atmospheric pressure sensor arranged at the reference height, and the control unit can determine that the worker is at a high place based on this difference. In addition, the hook state detection sensor detects whether the hook of the safety belt is hooked on a fall prevention member such as a handrail or a rope. If the worker is at a high place but the hook of the safety belt is not hooked on a fall prevention member, it can be said that the worker's work at a high place is in an unsafe state. In this case, the control unit can cause the notification unit to notify that the worker's work at a high place is in an unsafe state, and can notify, for example, a supervisor or manager. This can warn the worker to correct the unsafe state. In addition, the notification unit can notify the worker himself of the unsafe state, and in this case, the unsafe state can be corrected and the worker can safely work at a high place.

[0013] In a second aspect of the present disclosure, the first reference atmospheric pressure sensor is installed on a floor lower than the second reference atmospheric pressure sensor, and the estimation unit is configured to estimate that the worker is on the floor where the first reference atmospheric pressure sensor is installed when the detection value of the atmospheric pressure output from the worker side atmospheric pressure sensor is less than or equal to the detection value of the atmospheric pressure output from the first reference atmospheric pressure sensor and is greater than the detection value of the atmospheric pressure output from the second reference atmospheric pressure sensor.

[0014] With this configuration, the floor on which the worker is located can be accurately estimated based on the detected atmospheric pressure values ​​output from each of the worker-side atmospheric pressure sensor, the first reference atmospheric pressure sensor, and the second reference atmospheric pressure sensor.

[0015] In a third aspect of the present disclosure, there is provided a method for controlling a hook state detection sensor, comprising: a slave unit having the worker side atmospheric pressure sensor and the hook state detection sensor; a first reference station having the first reference atmospheric pressure sensor; a second reference station having the second reference atmospheric pressure sensor; a master unit having the estimation unit and the control unit; and an administrator terminal having the notification unit, wherein the slave unit is provided with a slave side transmission unit that transmits the detection value of the atmospheric pressure output from the worker side atmospheric pressure sensor and the detection result of the hook state detection sensor, and the first reference station is provided with a slave side transmission unit that transmits the detection value of the atmospheric pressure output from the first reference atmospheric pressure sensor. The first reference station transmitting unit is provided to transmit the detection value of atmospheric pressure output from the second reference atmospheric pressure sensor, the second reference station is provided with a second reference station transmitting unit to transmit the detection value of atmospheric pressure and the detection result transmitted from the child unit side transmitting unit, the first reference station transmitting unit and the second reference station transmitting unit, respectively, and a parent unit side transmitting unit to output a control signal for the notification unit output from the control unit, and the manager terminal is provided with an manager side receiving unit to receive the control signal transmitted from the parent unit side transmitting unit.

[0016] According to this configuration, by installing the first and second reference stations on different floors, the atmospheric pressure at the reference height of each floor can be detected and transmitted to the parent unit. The parent unit receives the detected values ​​of the atmospheric pressure at the reference height of each floor transmitted from the first and second reference stations and the detected values ​​of the atmospheric pressure according to the height of the worker transmitted from the child unit, and can estimate the floor where the worker is located, determine whether the worker is working at height on each floor, and determine the state of the hook based on the received detected values. In other words, while the estimation unit and the control unit are consolidated in the parent unit, it is possible to grasp the unsafe state on each floor and give appropriate instructions to the worker.

[0017] In a fourth aspect of the present disclosure, the slave units include a first slave unit and a second slave unit worn by workers on different floors, the first slave unit is provided with a slave unit side receiving unit that receives the detection value of atmospheric pressure transmitted from the slave unit side transmitting unit of the second slave unit, the slave unit side transmitting unit of the first slave unit is configured to transmit the detection value of atmospheric pressure received by the slave unit side receiving unit, and the master unit side receiving unit is configured to receive the detection value of atmospheric pressure of the first slave unit and the detection value of atmospheric pressure of the second slave unit transmitted from the slave unit side transmitting unit of the first slave unit, and the detection values ​​of atmospheric pressure transmitted from the first reference station transmitting unit and the second reference station transmitting unit, respectively.

[0018] That is, for example, if the parent unit is installed on the first floor, the first child unit is on the second floor, and the second child unit is on the third floor, the distance between the parent unit and the second child unit is long, and depending on the configuration of the receiving unit and transmitting unit, communication may be difficult. With this configuration, the first child unit on the second floor receives the detected value of atmospheric pressure transmitted from the second child unit on the third floor, and the first child unit can transmit it to the parent unit on the first floor. Therefore, even if the distance between the parent unit and the second child unit is long, the first child unit on the way acts as a relay station, and the parent unit can reliably receive the detected value of atmospheric pressure transmitted from the second child unit.

[0019] In a fifth aspect of the present disclosure, the handset side receiving unit of the first handset is configured to receive the detection result of the hook state detection sensor, the handset side transmitting unit of the first handset is configured to transmit the detection result received by the handset side receiving unit, and the parent side receiving unit is configured to receive the detection result of the first handset and the detection result of the second handset transmitted from the handset side transmitting unit of the first handset.

[0020] According to this configuration, for example, if the parent unit is installed on the first floor, the first handset is on the second floor, and the second handset is on the third floor, even if the distance between the parent unit and the second handset is long, the first handset located in between acts as a relay station, and the parent unit can reliably receive the detection results of the hook state detection sensor transmitted from the second handset.

[0021] In a sixth aspect of the present disclosure, the first slave unit is worn by a worker on a floor where the first reference station is installed, and the second slave unit is worn by a worker on a floor where the second reference station is installed, and the master unit is provided with a memory unit that stores a first offset value which is the difference between the detection value of the worker-side atmospheric pressure sensor of the first slave unit and the detection value of the first reference atmospheric pressure sensor at the time of setting up performed before the operation of the height-work safety management system, and a second offset value which is the difference between the detection value of the worker-side atmospheric pressure sensor of the second slave unit and the detection value of the second reference atmospheric pressure sensor at the time of setting up, and the control unit is configured to apply the first offset value and the second offset value stored in the memory unit to determine whether or not a worker is at a high altitude.

[0022] According to this configuration, it is possible to accurately determine whether or not a worker on each floor is at a high altitude.

[0023] In a seventh aspect of the present disclosure, the first offset value is a value obtained by subtracting the detection value of the first reference atmospheric pressure sensor from the detection value of the worker-side atmospheric pressure sensor of the first slave unit at the time of setting, and the control unit is configured to determine whether or not the worker is at a high altitude based on a value obtained by subtracting the detection value of the first reference atmospheric pressure sensor, the first offset value, and a predetermined threshold value from the detection value of the worker-side atmospheric pressure sensor of the first slave unit. Effect of the Invention

[0024] As described above, the floor on which the worker is located can be estimated based on the detected atmospheric pressure value output from the worker's side atmospheric pressure sensor, the detected atmospheric pressure value output from the first reference atmospheric pressure sensor, and the detected atmospheric pressure value output from the second reference atmospheric pressure sensor. Therefore, even when work is being performed on multiple floors, it is possible to ensure that the worker does not forget to fasten the hook of the safety belt when working at height, thereby enabling the worker to work at height safely. [Brief description of the drawings]

[0025] [Figure 1] 1 is a diagram showing a work site in which a work at height safety management system according to an embodiment of the present invention is used. [Diagram 2] FIG. 2 is a schematic diagram of the above-mentioned high-altitude work safety management system. [Diagram 3] FIG. 2 is a block diagram of the above-mentioned work-at-height safety management system. [Figure 4] FIG. 2 is a diagram for explaining a first example of an operation form of the above-mentioned high-altitude work safety management system. [Diagram 5] FIG. 2 is a diagram for explaining a second example of the operation form of the above-mentioned high-altitude work safety management system. [Figure 6] FIG. [Figure 7] FIG. 2 is a block diagram of a reference station. [Figure 8] 3 is a control flowchart of the above-mentioned high-altitude work safety management system. [Figure 9]11 is a diagram showing a method for calculating an offset value when a parent unit and a child unit are at the same height. FIG. [Figure 10] 11 is a diagram illustrating a method for calculating an offset value when a parent device and a child device are paired. FIG. [Figure 11] FIG. 2 is a diagram illustrating the operation of the above-mentioned high-altitude work safety management system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present invention, its applications, or its uses.

[0027] FIG. 1 is a diagram showing a work site where a work at height safety management system 1 (shown in FIG. 2 and FIG. 3) according to an embodiment of the present invention is used. The work site is, for example, a site where construction work, maintenance management, maintenance inspection work, etc. of various buildings are performed. The work site targeted by the work at height safety management system 1 according to the present embodiment is a multi-story building or a temporary scaffold. Various construction work at such work sites includes, for example, indoor and outdoor piping work and wiring work. Such various work sites may involve so-called work at height, such as work on scaffolding, work on top of a machine, work on a high work platform, etc. Work at height can be defined as work at a height that is, for example, 1.5 m or 2.0 m or more higher (a height higher than a specified height) when the height of the floor or the ground is set as the reference height, and may follow the definition in the Industrial Safety and Health Act.

[0028] As shown in FIG. 1, a work site is provided with a work floor 100 on which a worker A walks and performs various tasks, and a fall prevention member 101. The work floor 100 is a floor for performing high-altitude work, and is located at a height that is a certain level higher than a reference height. The work floor 100 may be composed of a scaffolding board or a work platform. The fall prevention member 101 is a member for preventing the worker A from falling from the work floor 100, and may be, for example, a handrail or a rope stretched across the side, but is not limited to these, and may be a part of various structures.

[0029] A worker A wears a safety belt 200 in preparation for working at height. In this embodiment, a case where the safety belt 200 is a full harness type will be described. The safety belt 200 includes a waist belt 201 wrapped around the waist of the worker A, a leg belt 202 wrapped around the thighs, a shoulder belt 203 extending from the waist belt 201 to the shoulders, and a hook 205 attached to the tip of a rope 204 extending to the left and right from the waist belt 201. The present invention can be applied to a safety belt other than the full harness type safety belt 200, for example, a safety belt without the leg belt 202 or the shoulder belt 203. Only one hook 205 may be provided.

[0030] FIG. 2 shows an example of the configuration of the high-altitude work safety management system 1, and is a schematic diagram of the high-altitude work safety management system 1. The high-altitude work safety management system 1 includes slave units 2A, 2B, 2C, 2D, and 2E (shown in FIG. 3) worn by a worker A, a master unit 3 installed away from the slave units 2A to 2E, a manager terminal 4, and reference stations 5B to 5E. The slave units 2A to 2E and the master unit 3 are configured to be able to communicate with each other by short-distance wireless communication of LPWA (Low Power Wide Area), and the reference station 5 and the master unit 3 are configured to be able to communicate with each other by similar short-distance wireless communication. The communication form between the slave units 2A to 2E and the master unit 3 and the communication form between the reference station 5 and the master unit 3 are not limited to the short-distance wireless communication described above, and may be a communication form by an Internet line, a local area network line, or the like. The master unit 3 and the manager terminal 4 can be connected via, for example, an Internet line, a local area network line, or the like, but may also be configured to be able to communicate with each other by short-distance wireless communication of LPWA. Details of the communication means will be described later.

[0031] The work at height safety management system 1 is a system that manages a worker A who wears a safety belt 200 and works at height. Managing the worker A means judging whether the worker A is working at height unsafely, and if it is safe, allowing the worker A to continue working without any special notification, and if it is unsafe, notifying, for example, a manager or the worker A himself, to let him know that it is unsafe and to have him improve the situation. By using this work at height safety management system 1, it becomes possible to manage the worker A. The details of the work at height safety management system 1 will be described below.

[0032] (Configuration of child units 2A to 2E) As shown in FIG. 3, when there are multiple workers A, there are multiple slave units 2A to 2E, and the multiple slave units 2A to 2E constitute a part of the high-altitude work safety management system 1. That is, the operation form of the high-altitude work safety management system 1 according to the first example will be described with reference to FIG. 4. FIG. 4 shows a case where workers A1 to A5 are working inside a five-story building 105. The dashed lines in FIG. 4 are schematic diagrams showing communication paths. There are multiple workers A1 on the first floor, and one of them, worker A1, is working on a work floor 100 located at a high place. There are multiple workers A2 on the second floor, and one of them, worker A2, is working on a work floor 100 located at a high place. The same is true for the third, fourth, and fifth floors. The number of workers A1 to A5, the number of floors of the building 105, etc. are not limited to those shown in the figure, and may be any number of people and any number of floors. Moreover, work may be carried out simultaneously on all floors, or only on some floors. Furthermore, the floor on which work is carried out may be the basement.

[0033] In this specification, the slave units 2A to 2E are referred to as slave units 2A to 2E for the 1st to 5th floors, but this is for convenience of explanation, and the structures of the slave units 2A to 2E for the 1st to 5th floors are all the same. Therefore, as long as pairing with a reference station installed on each floor (described later) is performed, there is no restriction that the slave unit 2A for the 1st floor must be used on the 1st floor, and if the slave unit 2A for the 1st floor is paired with the reference station 5E installed on the 5th floor, it can be used as a slave unit for the 5th floor. The same applies to the other slave units 2B to 2E.

[0034] Worker A1 on the first floor of building 105 is equipped with handset 2A for the first floor. Worker A2 on the second floor of building 105 is equipped with handset 2B for the second floor. Worker A3 on the third floor of building 105 is equipped with handset 2C for the third floor. Worker A4 on the fourth floor of building 105 is equipped with handset 2D for the fourth floor. Worker A5 on the fifth floor of building 105 is equipped with handset 2E for the fifth floor.

[0035] In the first example, all of the slave units 2A to 2E for the 1st to 5th floors are configured to be able to communicate with the parent unit 3 installed on the 1st floor, and the communication form between the parent unit 3 and the slave units 2A to 2E for the 1st to 5th floors in this case is a communication form using an Internet line or a local area network line, which allows communication over a wider area than LPWA.

[0036] Meanwhile, FIG. 5 shows a second example of the operation form of the high-altitude work safety management system 1. In the second example, the communication form between the master unit 3 and the slave units 2A-2E for the 1st to 5th floors is a communication form using LPWA. For example, since the distance between the slave unit 2E for the 5th floor and the master unit 3 installed on the 1st floor is long, direct communication between the slave unit 2E for the 5th floor and the master unit 3 may be difficult if LPWA is used. In such a case, by enabling communication between the slave unit 2E for the 5th floor and the slave unit 2D for the 4th floor, communication between the slave unit 2D for the 4th floor and the slave unit 2C for the 3rd floor, communication between the slave unit 2C for the 3rd floor and the slave unit 2B for the 2nd floor, and communication between the slave unit 2B for the 2nd floor and the slave unit 2A for the 1st floor, it becomes possible to transmit various detection values ​​and detection results detected by the slave unit 2E for the 5th floor to the master unit 3 via the slave unit 2D for the 4th floor, the slave unit 2C for the 3rd floor, and the slave unit 2B for the 2nd floor. Also, if communication between the fifth floor handset 2E and the third floor handset 2C is possible in terms of distance, it is not necessary to use the fourth floor handset 2D. Similarly, various detection values ​​and detection results detected by the fourth floor handset 2D can be transmitted to the base unit 3 via the third floor handset 2C and the second floor handset 2B, and various detection values ​​and detection results detected by the third floor handset 2C can be transmitted to the base unit 3 via the second floor handset 2B. In this case, the first floor handset 2A may be used.

[0037] As shown in Fig. 1, the slave units 2A-2E for the first to fifth floors can be attached to a safety belt 200 and can be integrated with the safety belt 200. As shown in this figure, the slave units 2A-2E for the first to fifth floors are attached to a hook 205 and integrated with the hook 205. The slave units 2A-2E for the first to fifth floors can also be built into a portion of the hook 205, which is a base end portion of the hook 205, to which a rope 204 is connected. The slave units 2A-2E for the first to fifth floors may be attached to a waist belt 201 of the safety belt 200 at a portion other than a hook state detection sensor 20 described later, or may be attached to the workers A1-A5 without the safety belt 200.

[0038] Fig. 6 is a block diagram showing a detailed structure of the first-floor slave unit 2A. As shown in this figure, the first-floor slave unit 2 includes a hook state detection sensor 20, an operator-side atmospheric pressure sensor 21, a slave-side transmitter 22, a slave-side receiver 23, a slave-side microcomputer (slave-side controller) 24, and a battery 25. The hook state detection sensor 20 and the operator-side atmospheric pressure sensor 21 can be separated, and the operator-side atmospheric pressure sensor 21 can also be attached to the helmet of the worker A, etc.

[0039] As shown in FIG. 2, the hook state detection sensor 20 is provided on the inner periphery of the hook 205, that is, the part of the hook 205 that contacts the fall prevention member 101 (shown in FIG. 1), and is a sensor for detecting whether the hook 205 is in a state of being hung on the fall prevention member 101. When the hook 205 is hung on the fall prevention member 101, the hook state detection sensor 20 comes into contact with the fall prevention member 101 due to the weight of the hook 205. This hook state detection sensor 20 can be configured with a well-known switch or the like that switches from a non-conductive state (OFF state) to a conductive state (ON state) by contact with the fall prevention member 101. The hook state detection sensor 20 can also be configured with a pressure sensor or the like that detects the application of a pressure equal to or greater than a predetermined pressure. A signal line (not shown) extending from the hook state detection sensor 20 is connected to the child device side microcomputer 24, and the detection result by the hook state detection sensor 20 is input to the child device side microcomputer 24.

[0040] All or some of the worker side atmospheric pressure sensor 21, the slave side transmitting unit 22, the slave side receiving unit 23, the slave side microcomputer 24, and the battery 25 are built into the hook 205. Note that all or some of the worker side atmospheric pressure sensor 21, the slave side transmitting unit 22, the slave side receiving unit 23, the slave side microcomputer 24, and the battery 25 may be configured to be attachable to an existing hook 205.

[0041] The worker-side atmospheric pressure sensor 21 is a sensor that is attached to the workers A1 to A5 and detects the atmospheric pressure around the workers A1 to A5, and is configured by a conventionally known atmospheric pressure sensor. In this embodiment, the worker-side atmospheric pressure sensor 21 is built into the hook 205, but the hook 205 and the workers A1 to A5 are not so far apart in the height direction, and the hook 205 is generally placed at approximately the same height as the workers A1 to A5, so the atmospheric pressure detected by the worker-side atmospheric pressure sensor 21 is equal to the atmospheric pressure at the height where the workers A1 to A5 are located. Even when the worker-side atmospheric pressure sensor 21 is attached to the helmet or waist belt 201 of the workers A1 to A5, the worker-side atmospheric pressure sensor 21 can detect the atmospheric pressure at the height where the workers A1 to A5 are located. For the safety of the workers A1 to A5, it is preferable that the worker-side atmospheric pressure sensor 21 has a short atmospheric pressure detection cycle, but taking into consideration consumption of the battery 25, the worker-side atmospheric pressure sensor 21 detects the atmospheric pressure at a cycle of, for example, about once per second and outputs the detected value (atmospheric pressure value). The worker-side atmospheric pressure sensor 21 is connected to the slave-side microcomputer 24, and the detected value by the worker-side atmospheric pressure sensor 21 is input to the slave-side microcomputer 24.

[0042] The slave-side transmitting unit 22 is a part that transmits the detected value of atmospheric pressure output from the worker-side atmospheric pressure sensor 21 and the detection result by the hook state detection sensor 20. Specifically, the slave-side transmitting unit 22 is connected to the slave-side microcomputer 24, and transmits the detected value of atmospheric pressure input to the slave-side microcomputer 24 and the detection result by the hook state detection sensor 20 to the outside in accordance with instructions from the slave-side microcomputer 24. Every time the detected value of atmospheric pressure and the detection result by the hook state detection sensor 20 are input to the slave-side microcomputer 24, the slave-side microcomputer 24 causes the detection value and the detection result to be transmitted from the slave-side transmitting unit 22 to the outside.

[0043] The detected value of atmospheric pressure and the detection result by the hook state detection sensor 20 are provided with identification information for identifying which of the slave units 2A to 2E they are, and the detected value of atmospheric pressure provided with the identification information and the detection result provided with the identification information are transmitted to the outside. The identification information can be, for example, an ID number unique to the slave units 2A to 2E, or a different number provided by the manager for each slave unit, but is not limited to these, and can include various types of identification information. Even slave units used on the same floor have different identification information, so that the same identification information does not exist at the same work site. The identification information can be associated with the workers A1 to A5, and the manager holds the wearing information of which worker A is wearing which slave unit.

[0044] In a first example shown in Fig. 4, the slave device side transmitter 22 is configured with a communication module capable of wireless communication with an Internet line or a local area network line. On the other hand, in a second example shown in Fig. 5, the slave device side transmitter 22 is configured with a communication module capable of short-distance wireless communication, for example, a low-power wide area network module such as a conventionally known Wi-SUN FAN, LoRa module, Sigfox module, or NB-IoT module, and a communication standard capable of multi-hopping is preferable.

[0045] The handset side receiving section 23 is a communication module capable of communicating with the handset side transmitting section 22 of the other handset 2B to 2E, and specifically, is configured with a communication module of the same standard as the handset side transmitting section 22. The handset side receiving section 23 of the first floor handset 2A is capable of communicating with any of the handset side transmitting sections 22 of the second to fifth floor handset 2B to 2E. Therefore, the handset side receiving section 23 of the first floor handset 2A receives the detection value of the atmospheric pressure transmitted from the handset side transmitting section 22 of the second to fifth floor handset 2B to 2E and the detection result by the hook state detection sensor 20. Similarly, each handset side receiving section 23 of the second to fifth floor handset 2B to 2E receives the detection value of the atmospheric pressure transmitted from the handset side transmitting section 22 of the other handset and the detection result by the hook state detection sensor 20.

[0046] Each handset-side transmitter 22 of the handset units 2A-2E for the first to fifth floors is also capable of transmitting the atmospheric pressure detection value of the other handset units and the detection result by the hook state detection sensor 20 received by each handset-side receiver 23. That is, when the handset-side microcomputer 24 receives the atmospheric pressure detection value of the other handset units and the detection result by the hook state detection sensor 20 at the handset-side receiver 23, it causes the handset-side transmitter 22 to transmit the detection value and the detection result to which the identification information has been added to the detection value and the detection result to the outside, without deleting the identification information added to the detection value and the detection result. Since the first to fifth floor slaves 2A to 2E are configured in this manner, as shown by the communication path in Fig. 5 with a dashed line, the detection value and detection result for the fifth floor transmitted from the slave side transmitter 22 of the fifth floor slave 2E can be received by the slave side receiver 23 of the fourth floor slave 2D and transmitted from the slave side transmitter 22 of the fourth floor slave 2D, received by the slave side receiver 23 of the third floor slave 2C and transmitted from the slave side transmitter 22 of the third floor slave 2C, received by the slave side receiver 23 of the second floor slave 2B and transmitted from the slave side transmitter 22 of the second floor slave 2B, and received by the base unit 3. This type of communication form is called multi-hopping.

[0047] The detection result of the hook state detection sensor 20 includes an OFF state in which the hook 205 is not hooked on the fall prevention member 101, and an ON state in which the hook 205 is hooked on the fall prevention member 101. The detection result of the hook state detection sensor 20 transmitted from the slave side transmission unit 22 may be an ON or OFF signal of the hook state detection sensor 20, or a signal indicating that the hook 205 is not hooked on the fall prevention member 101 and a signal indicating that the hook 205 is hooked on the fall prevention member 101.

[0048] The battery 25 is for supplying power to the hook state detection sensor 20, the operator side atmospheric pressure sensor 21, the slave side transmitting unit 22, the slave side receiving unit 23, and the slave side microcomputer 24. The battery 25 may be a rechargeable battery or a replaceable dry cell.

[0049] (Configuration of reference stations 5B to 5D) As shown in FIG. 4, when workers A1 to A5 are working inside a five-story building 105, the second floor reference station 5B is installed on the second floor, the third floor reference station 5C is installed on the third floor, the fourth floor reference station 5D is installed on the fourth floor, and the fifth floor reference station 5E is installed on the fifth floor. Each of the reference stations 5B to 5E is installed in a place (installation position) where the height does not change, such as the floor of the work site or the lower part of a workbench. Each of the reference stations 5B to 5E only needs to be installed so as not to move in the vertical direction, and movement in the horizontal direction is not a problem. The reason for this is due to the high place detection algorithm described later.

[0050] In this specification, the reference stations 5B to 5E are referred to as the reference stations 5B to 5E for the second to fifth floors, but this is for convenience of explanation, and the structures of the reference stations 5B to 5E for the second to fifth floors are all the same. Therefore, as long as the reference station 5B for the second floor is paired with each of the slave units 2B to 2E for the second to fifth floors described above, there is no restriction that the reference station 5B for the second floor must be used on the second floor, and if the reference station 5B for the second floor is paired with the slave unit 2E used on the fifth floor, it can be used as the reference station for the fifth floor. The same applies to the other reference stations 5C to 2E.

[0051] The second to fifth floor reference stations 5B to 5E may be installed on the floor of each floor, on a stand, or on a tripod or other device. In the first example shown in Fig. 4 and the second example shown in Fig. 5, the same reference stations 5B to 5E for the second to fifth floors may be used.

[0052] FIG. 7 is a block diagram showing a detailed structure of the second floor reference station 5B. As shown in this figure, the second floor reference station 5B includes a reference atmospheric pressure sensor 51, a reference station transmitter 52, a reference station microcomputer 53, and a battery 54. The battery 54 can be configured with the same battery 25 of the slave units 2A to 2E. Instead of the battery 54, power may be supplied from a commercial power source or the like. The reference atmospheric pressure sensor 51, the reference station transmitter 52, the reference station microcomputer 53, and the battery 54 can be integrated and housed in one housing 56, but only some of them can be housed in the housing 56 and the others can be housed in another housing (not shown).

[0053] The reference atmospheric pressure sensor 51 of the second floor reference station 5B is configured separately from the worker-side atmospheric pressure sensors 21 of the second- to fifth-floor slave units 2A-2E, and is installed at a reference height that serves as a reference for determining whether or not the second floor worker A2 is at a high altitude, and is a sensor that detects the atmospheric pressure at that reference height. The reference atmospheric pressure sensor 51 itself can be configured with the same atmospheric pressure sensor that constitutes the worker-side atmospheric pressure sensor 21. The reference atmospheric pressure sensor 51 is connected to the reference station microcomputer 53, and the detection value by the reference atmospheric pressure sensor 51 is input to the reference station microcomputer 53.

[0054] Because the reference atmospheric pressure sensor 51 is provided in the second floor reference station 5B, when worker A2 on the second floor is working, it is located away from the worker-side atmospheric pressure sensor 21 of the second floor slave unit 2A, and detects atmospheric pressure at a different height from that of the worker-side atmospheric pressure sensor 21 of the second floor slave unit 2A. Specifically, because the second floor reference station 5B is installed in a place where the height does not change, it continues to detect atmospheric pressure at the same height, for example the height of the floor, ground, or workbench, while worker A2 is working.

[0055] The reference station transmitting unit 52 is configured with a communication module similar to the slave unit side transmitting unit 22 of the slave units 2A to 2E used in the height work safety management system 1 according to the first example. That is, the reference station transmitting unit 52 is configured with a communication module capable of communication in a communication form using an Internet line, a local area network line, etc. The reference station transmitting units 52 of the reference stations 5B to 5E for the second to fifth floors are capable of communication over longer distances than LPWA, and therefore can communicate directly with the master unit 3.

[0056] The reference station transmitter 52 transmits the detected value of atmospheric pressure input from the reference atmospheric pressure sensor 51 to the outside in accordance with instructions from the reference station microcomputer 53. Every time the detected value of atmospheric pressure is input to the reference station microcomputer 53, the reference station microcomputer 53 causes the reference station transmitter 52 to transmit the detected value to the outside.

[0057] (Configuration of parent unit 3) As shown in Figures 4 and 5, the parent unit 3 is installed in a place (installation position) where the height does not change, such as the floor or ground of the work site on the first floor, or the underside of a workbench. The parent unit 3 only needs to be installed so that it does not move in the vertical direction, and movement in the horizontal direction is not an issue. The reason for this is due to the high place detection algorithm described later.

[0058] 3, the master unit 3 includes a reference atmospheric pressure sensor 30, a master unit receiving section 31, a master unit transmitting section 32, a master unit microcomputer 33, a memory section 34, and a battery 35. The battery 35 can be configured to be the same as the battery 25 of the slave units 2A to 2E. Instead of the battery 35, power may be supplied from a commercial power source or the like.

[0059] As shown in FIG. 3, the reference atmospheric pressure sensor 30, the parent unit receiving unit 31, the parent unit transmitting unit 32, the parent unit microcomputer 33, the memory unit 34 and the battery 35 can be housed and integrated in a single housing 36, but it is also possible to house only some of them in the housing 36 and the others in a separate housing (not shown).

[0060] The reference atmospheric pressure sensor 30 is configured separately from the worker-side atmospheric pressure sensor 21 of the slave units 2A-2E for the second to fifth floors and the reference atmospheric pressure sensor 51 of the reference stations 5B-5E for the second to fifth floors, and is installed at a reference height that is a reference for determining whether the worker A1 on the first floor is at a high place or not, and is a sensor that detects the atmospheric pressure at that reference height. The reference atmospheric pressure sensor 30 itself can be configured with the same atmospheric pressure sensor that constitutes the worker-side atmospheric pressure sensor 21. Since the reference atmospheric pressure sensor 30 is provided in the master unit 3, when the worker A1 on the first floor is working, it is placed away from the worker-side atmospheric pressure sensor 21 of the slave unit 2A for the first floor, and detects atmospheric pressure at a height different from that of the worker-side atmospheric pressure sensor 21 of the slave unit 2A for the first floor. Specifically, since the master unit 3 is installed in a place where the height does not change, it continues to detect atmospheric pressure at the same height, for example, the height of the floor, ground, or workbench, while the worker A1 on the first floor is working.

[0061] The master side receiving unit 31 has a communication module capable of communicating with the second to fifth floor reference stations 5B to 5E, specifically, a communication module of the same standard as the reference station transmitting unit 52 of the second to fifth floor reference stations 5B to 5E. Furthermore, the master side receiving unit 31 has a communication module capable of communicating with the first to fifth floor slave units 2A to 2E, specifically, a communication module of the same standard as the slave side transmitting unit 22 of the first to fifth floor slave units 2A to 2E. In other words, the master side receiving unit 31 can be configured to have a communication module capable of wireless communication with the Internet line or a local area network line, and a communication module capable of short-distance wireless communication of LPWA.

[0062] 4, the slave side transmitter 22 of the slave units 2A to 2E for the 1st to 5th floors is a communication module capable of wireless communication with the Internet or a local area network, so a communication module capable of short-distance wireless communication of LPWA is not necessary, and therefore the master side receiver 31 can be configured to have only a communication module capable of wireless communication with the Internet or a local area network. In the first example, the master side receiver 31 receives the detection value of the atmospheric pressure transmitted from the slave side transmitter 22 of the slave units 2A to 2E for the 1st to 5th floors, i.e., the detection value of the atmospheric pressure detected by the worker side atmospheric pressure sensor 21 of the slave units 2A to 2E for the 1st to 5th floors, and also receives the detection result of the hook state detection sensor 20 of the slave units 2A to 2E for the 1st to 5th floors.

[0063] On the other hand, in the case of the second example shown in Fig. 5, the slave side transmitter 22 of the slaves 2A to 2E for the first to fifth floors is a communication module capable of short-distance wireless communication of LPWA, so the master side receiver 31 is configured to also have a communication module capable of short-distance wireless communication. In the second example, the detection values ​​and detection results transmitted from the slaves 2C to 2E installed at locations far from the master 3, such as the third to fifth floors, are transmitted by the above-mentioned multi-hopping and received by the master side receiver 31. Also, the detection values ​​and detection results transmitted from the slaves 2A and 2B installed at locations close to the master 3, such as the first and second floors, are directly received by the master side receiver 31.

[0064] 3, which will be described later, is a part that outputs a control signal output from the parent device's microcomputer 33. The parent device's transmitting unit 32 may be configured with a communication module similar to that of the child device's transmitting unit 22, or may be configured with a communication module capable of wireless communication with an Internet line or a local area network line.

[0065] The parent microcomputer 33 is a part that remotely controls the speaker 42 and the display unit 40 of the manager terminal 4 described later. The parent microcomputer 33 includes an estimation unit 33a for estimating the floor where the worker is located, and a control unit 33b including a high altitude determination unit 33c for determining whether the worker is at a high altitude on the estimated floor. The estimation unit 33a and the control unit 33b are parts that are configured by operating the parent microcomputer 33 according to a predetermined program, and may be configured as hardware or a combination of software and hardware.

[0066] The estimation unit 33a is a part that estimates the floor where the worker is located based on the detected atmospheric pressure value output from the worker-side atmospheric pressure sensor 21 and the detected atmospheric pressure values ​​output from the reference atmospheric pressure sensors 51, 30 installed on different floors. As will be described in detail later, "different floors" refers to floors adjacent to each other vertically, for example, the first and second floors, the second and third floors, etc. In the case of the first floor, the detected atmospheric pressure value is the detected atmospheric pressure value output from the reference atmospheric pressure sensor 30 of the master unit 3, while in the cases of the second to fifth floors, the detected atmospheric pressure value is the detected atmospheric pressure value output from the reference atmospheric pressure sensors 51 of the reference stations 5B to 5E.

[0067] The high altitude determination unit 33c determines whether the worker A is at a height higher than the reference height by a predetermined value or more based on the difference between the atmospheric pressure detection value output from the worker-side atmospheric pressure sensor 21 and the atmospheric pressure detection value output from the reference atmospheric pressure sensor 30, 51 installed on the floor where the worker-side atmospheric pressure sensor 21 is located. For example, when determining whether the worker A1 is at a height higher than the reference height, the determination is made based on the difference between the atmospheric pressure detection value output from the worker-side atmospheric pressure sensor 21 worn by the worker A1 on the first floor and the atmospheric pressure detection value output from the reference atmospheric pressure sensor 30 of the master unit 3 installed on the first floor. When determining whether the worker A2 is at a height higher than the reference height, the determination is made based on the difference between the atmospheric pressure detection value output from the worker-side atmospheric pressure sensor 21 worn by the worker A2 on the second floor and the atmospheric pressure detection value output from the reference atmospheric pressure sensor 51 of the second floor reference station 5B installed on the second floor.

[0068] The operation of the estimation unit 33a and the control unit 33b will be described below with reference to the flow chart shown in FIG. 8. In step S1 after starting, the reference stations 5B-5E for the 2nd to 5th floors measure the reference atmospheric pressure. This may be done at predetermined short time intervals, or may be measured continuously. The reference atmospheric pressure for the 2nd to 5th floors is the detection value of the atmospheric pressure detected by each of the reference atmospheric pressure sensors 51 of the reference stations 2B-2E for the 2nd to 5th floors. In step S2, the reference stations 2B-2E for the 2nd to 5th floors transmit the detection value of the atmospheric pressure detected by each of the reference atmospheric pressure sensors 51 to the master unit 3, and input it to the master unit side microcomputer 33.

[0069] In step S3, the slave units 2A to 2E for the 1st to 5th floors measure the atmospheric pressure. This may be done at predetermined short time intervals, or may be done continuously. In step S4, the slave units 2A to 2E for the 1st to 5th floors transmit the atmospheric pressure detected by the worker side atmospheric pressure sensor 21 to the master unit 3, and input it to the master unit side microcomputer 33.

[0070] In step S5, the master unit 3 measures the reference atmospheric pressure on the first floor. This may be done at predetermined short time intervals, or may be measured continuously. The reference atmospheric pressure on the first floor is the detected value of atmospheric pressure detected by the reference atmospheric pressure sensor 30 of the master unit 3. The detected value of atmospheric pressure detected by the reference atmospheric pressure sensor 30 of the master unit 3 is also input to the master unit side microcomputer 33.

[0071] In step S6, the estimation unit 33a executes a process of setting the lowest floor included in the information of the building 105 as i and a calculation of j=i+1. The information of the building 105 is input in advance by an administrator or a user and is stored in the storage unit 34 of the master unit 3. The estimation unit 33a acquires information on the lowest floor from the storage unit 34. The lowest floor is the lowest floor among the floors on which work is being performed. As shown in FIG. 4, if work is being performed on the first to fifth floors, the lowest floor is the first floor, but if work is not being performed on the first floor and work is being performed on the second to fifth floors, the lowest floor is the second floor. Below, a case where work is being performed on the first to fifth floors will be described. Therefore, in step S6, i=1 and j=2.

[0072] In step S7, calculation value 1 and calculation value 2 are calculated. Before this, the offset value will be explained. That is, before the operation of the high-altitude work safety management system 1, the high-altitude work safety management system 1 is set up. This setting is called pairing, and for example, the detection value of the worker-side atmospheric pressure sensor 21 and the detection value of the reference atmospheric pressure sensor 30 are obtained, and an offset value is calculated as shown in FIG. 10. This will be described in detail later.

[0073] When setting up the height work safety management system 1, first, the parent unit 3 is installed at the installation position, the first floor slave unit 2A is attached to the first floor worker A1, and the worker A1 wearing the first floor slave unit 2A stands at the same height as the installation position of the parent unit 3. Note that the difference from the standard height due to the height of the worker A1 can be absorbed by an offset value, so it does not have to be the same height.

[0074] Then, the detection values ​​of the worker-side atmospheric pressure sensor 21 on the first floor and the reference atmospheric pressure sensor 30 of the parent unit 3 are input to the parent unit microcomputer 33. The parent unit microcomputer 33 subtracts the detection value of the reference atmospheric pressure sensor 30 from the detection value of the worker-side atmospheric pressure sensor 21. The value obtained by this subtraction process is the offset value. In other words, even if the worker-side atmospheric pressure sensor 21 and the reference atmospheric pressure sensor 30 are configured with the same atmospheric pressure sensor, variations are unavoidable, and for example, even if atmospheric pressure is detected at the same height and at the same timing, there may be a difference in the detection value. In addition, the height of the worker-side atmospheric pressure sensor 21 worn by the worker A1 may be located higher than the reference atmospheric pressure sensor 30 even if the worker A1 stands at the same height as the installation height of the parent unit 3. In order to prevent the estimation unit 33a from making an estimation error and the high place judgment unit 33c from making a judgment error due to the above-mentioned sensor variations, the offset value is calculated in advance. In this way, the origin correction in the height direction is performed by calibration. The calculated offset value is stored in the storage unit 34. The storage unit 34 is configured, for example, with a semiconductor memory or a solid state drive (SSD), and is capable of recording and reading data. In addition, an offset value is calculated for each worker A1 for all workers A1, and is stored in an identifiable manner.

[0075] Similarly, offset values ​​are also calculated for the second to fifth floors. For example, to calculate the offset value for the second floor, the master unit microcomputer 33 subtracts the detection value of the reference atmospheric pressure sensor 51 in the second floor reference station 5B from the detection value of the worker side atmospheric pressure sensor 21 worn by the worker A2 on the second floor. The offset values ​​for the third to fifth floors can be calculated in the same manner.

[0076] Fig. 9 shows an example of calculation of offset values ​​between the worker-side atmospheric pressure sensors 21 of the three first-floor slave units 2A-1 to 2A-3 and the reference atmospheric pressure sensor 30 of the master unit 3. Fig. 9 shows a case in which the first-floor slave unit 2A-1, the first-floor slave unit 2A-2, and the first-floor slave unit 2A-3 are communicatively connected to a single master unit 3. When calculating the offset values, the first-floor slave unit 2A-1, the first-floor slave unit 2A-2, the first-floor slave unit 2A-3, and the master unit 3 are arranged at approximately the same height, and detection values ​​obtained by detecting atmospheric pressure at approximately the same timing are used. If the detection value of the worker side atmospheric pressure sensor 21 of the first floor slave unit 2A-1 is 10601.234 Pa and the detection value of the reference atmospheric pressure sensor 30 of the master unit 3 is 10625.678 Pa, the first offset value is the value obtained by subtracting the detection value of the master unit reference atmospheric pressure sensor 30 from the detection value of the worker side atmospheric pressure sensor 21, that is, -24.444 Pa. A similar calculation method can be used to calculate the second offset value, which is the offset value between the first floor slave unit 2A-2 and the master unit 3, and the third offset value, which is the offset value between the first floor slave unit 2A-3 and the master unit 3. This allows calibration between the atmospheric pressure sensors 21 and 30. The offset values ​​between the second to fifth floor reference stations 5B to 5E and the slave units 2B to 2E for each floor can be calculated in the same manner.

[0077] FIG. 10 shows an example of calculation of the offset value when pairing the master unit 3 and the first floor slave unit 2A. In the case of FIG. 10, unlike the case of FIG. 9, the first floor slave unit 2A is attached to the worker A1. When calculating the offset value in this example, the detection value obtained by detecting the atmospheric pressure at approximately the same timing by the first floor slave unit 2A and the master unit 3 while the worker A1 is standing on the floor or ground at the same height as the master unit 3 is used. For example, a pairing switch (not shown) is provided on each of the first floor slave unit 2A and the master unit 3, and the detection value of the worker-side atmospheric pressure sensor 21 and the detection value of the reference atmospheric pressure sensor 30 at the time when the pairing switch of the first floor slave unit 2A and the master unit 3 is pressed are stored. Since pairing is required in the same environment, it cannot be registered in advance. It is preferable that the installation height of the master unit 3 is set to a height at which the worker can perform pairing operation without bending over.

[0078] For example, if the detection value of the worker-side atmospheric pressure sensor 21 of the first floor slave unit 2A is 10607.234 Pa and the detection value of the reference atmospheric pressure sensor 30 of the master unit 3 is 10625.678 Pa, the offset value is the value obtained by subtracting the detection value of the reference atmospheric pressure sensor 30 from the detection value of the worker-side atmospheric pressure sensor 21, that is, -18.444 Pa. If there are two or more first floor slave units 2A, the second offset value and the third offset value can be calculated in the same manner. This allows pairing of the master unit 3 and the first floor slave unit 2A. The offset values ​​between the second to fifth floor reference stations 5B to 5E and the slave units 2B to 2E for each floor can be calculated in the same manner.

[0079] In step S7 of the flowchart shown in FIG. 8, the estimation unit 33a calculates a calculation value 1 and a calculation value 2. The calculation value 1 is obtained by adding the detected value of the atmospheric pressure on the i floor and the i floor offset value, and then subtracting the allowable error. The calculation value 2 is obtained by adding the detected value of the atmospheric pressure on the j floor and the j floor offset value, and then subtracting the allowable error. The allowable error is set to suppress estimation errors by the estimation unit 33a. The reason for taking the allowable error into consideration is that the atmospheric pressure value is constantly fluctuating. The allowable error can be set, for example, in the range of -5 Pa to -15 Pa, and is set to -10 Pa in this example. The allowable error does not have to be set.

[0080] Then, the process proceeds to step S8. In step S8, the detected value of the atmospheric pressure (slave atmospheric pressure value) detected by any of the slave units 2A to 2E is read, and it is determined whether or not the slave atmospheric pressure value is equal to or less than calculated value 1 and greater than calculated value 2. If the determination in step S8 is YES, it can be determined that the slave atmospheric pressure is detected by a slave unit located on the i-th floor, and therefore it can be presumed that the floor on which the slave unit is located is the i-th floor. In other words, it can be presumed that the worker is located on the i-th floor.

[0081] If the result of step S8 is NO, the process proceeds to step S9, where calculations of i=i+1 and j=i+1 are performed. In step S10, it is determined whether or not the i obtained in step S9 is the top floor. Whether or not it is the top floor can be determined based on information about the building 105. The information about the building 105 includes the top floor, which is input in advance by an administrator or a user and stored in the memory unit 34 of the parent unit 3. The top floor is the highest floor on which work is being performed.

[0082] If the determination in step S10 is NO, the process returns to step S7. On the other hand, if the determination in step S10 is YES, the process proceeds to step S11. Also, if the determination in step S8 is YES, the process proceeds to step S11. Steps S1 to S10 are a floor number estimation process executed by the estimation unit 33a. In the floor number estimation process, the floor on which the worker is located can be estimated based on the detected value of atmospheric pressure output from the worker-side atmospheric pressure sensor 21, the detected value of atmospheric pressure output from the reference atmospheric pressure sensor 30 (or the reference atmospheric pressure sensor 51) on the i floor, and the detected value of atmospheric pressure output from the reference atmospheric pressure sensor 51 on the j (= i + 1) floor. The reference atmospheric pressure sensor 30 (or the reference atmospheric pressure sensor 51) on the i floor is installed on a floor lower than the reference atmospheric pressure sensor 51 on the j floor, and the reference atmospheric pressure sensor 30 (or the reference atmospheric pressure sensor 51) installed on the i floor is the first reference atmospheric pressure sensor of the present invention, and the reference atmospheric pressure sensor 51 installed on the j floor is the second reference atmospheric pressure sensor of the present invention. A reference station having a first reference atmospheric pressure sensor is a first reference station, and a reference station having a second reference atmospheric pressure sensor is a second reference station. A first reference station transmitter 52 is provided in the first reference station, and a second reference station transmitter 52 is provided in the second reference station. A slave unit on the i floor is a first slave unit, and a slave unit on the j floor is a second slave unit.

[0083] The high altitude determination unit 33c shown in FIG. 3 is configured to apply the offset values ​​stored in the memory unit 34 during operation of the high altitude work safety management system 1 to determine whether or not workers A1 to A5 on the floor estimated by the estimation unit 33a are at a high altitude, and in a case where multiple offset values ​​are stored, for example, a first offset value, a second offset value, ... are applied respectively to determine whether or not workers A1 to A5 are at a high altitude.

[0084] Details of steps S11, S12, and S13 will be described below. First, in step S11 shown in Fig. 8, the high altitude determination unit 33a determines whether or not the workers A1 to A5 are at a high altitude based on a value obtained by subtracting the detection value of the reference atmospheric pressure sensor 30, 51 installed on the floor estimated by the estimation unit 33a, the corresponding offset value, and a predetermined high altitude determination threshold value from the detection value of the worker-side atmospheric pressure sensor 21 of the slave units 2A to 2E located on the floor estimated by the estimation unit 33a.

[0085] Next, the determination process of the high place determination unit 33c during operation of the high place work safety management system 1 will be described with reference to FIG. 11. FIG. 11 shows a case where the first floor child devices 2A-1 to 2A-3 are present. The first offset value between the parent device 3 and the first floor child device 2A-1 is -18.444 Pa, the second offset value between the parent device 3 and the first floor child device 2A-2 is -15.256 Pa, and the third offset value between the parent device 3 and the first floor child device 2A-3 is -16.856 Pa. The first to third offset values ​​in this case are values ​​calculated by the pairing shown in FIG. 10. In addition, the high place determination threshold value for determining whether or not it is a high place is -20.0 Pa when work at a height of 2 m or more is set as a high place. The high place determination threshold value can be set arbitrarily according to the height to be determined as a high place. In addition, the parent device 3 is installed at the reference height during operation of the high place work safety management system 1. It is assumed that the detection value of the reference atmospheric pressure sensor 30 of this master unit 3 is 10611.234 Pa.

[0086] Suppose that worker A1 wearing the first-floor slave unit 2A-1 is standing at the reference height, and the detection value of the worker-side atmospheric pressure sensor 21 of the first-floor slave unit 2A-1 is 10593.678 Pa. In this case, the high-altitude determination unit 33c executes the following calculation. The detection value of the reference atmospheric pressure sensor 30 of the master unit 3, the first offset value, and the high-altitude determination threshold value (-20.0 Pa) are subtracted from the detection value of the worker-side atmospheric pressure sensor 21 of the first-floor slave unit 2A-1. The obtained value (calculated value Z) is 20.888 Pa. Since Z>0, the high-altitude determination unit 33c determines that the worker A1 is at a lower place than the place defined as a high place (step S12).

[0087] Also, assume that worker A1 wearing the first-floor slave unit 2A-2 is standing on a work platform, and the detection value of the worker-side atmospheric pressure sensor 21 of the first-floor slave unit 2A-2 is 10566.945 Pa. In this case, the high-altitude determination unit 33c executes the following calculation. It subtracts the detection value of the reference atmospheric pressure sensor 30 of the master unit 3, the second offset value, and the high-altitude determination threshold value from the detection value of the worker-side atmospheric pressure sensor 21 of the first-floor slave unit 2A-2. The obtained value (Z) is -9.033 Pa. Since Z<0, the high-altitude determination unit 33c determines that worker A is in a place defined as a high altitude.

[0088] Also, assume that worker A1 wearing the first-floor slave unit 2A-3 is standing on the lifting device, and the detection value of the worker-side atmospheric pressure sensor 21 of the first-floor slave unit 2A-3 is 10480.678 Pa. In this case, the high-altitude determination unit 33c executes the following calculation. The value (Z) obtained by subtracting the detection value of the reference atmospheric pressure sensor 30 of the master unit 3, the third offset value, and the high-altitude determination threshold value from the detection value of the worker-side atmospheric pressure sensor 21 of the first-floor slave unit 2A-3 is -87.7 Pa. Since Z<0, the high-altitude determination unit 33c determines that this worker A1 is in a place defined as a high altitude.

[0089] If the result of the above calculation is Z=0, this includes an error and is basically impossible, so the high altitude determination unit 33c determines that the parent unit 3 is at a lower position than the child unit 2.

[0090] For the second to fifth floors, the same determination can be made by replacing the master unit 3 with the second to fifth floor reference stations 5B to 5E.

[0091] As shown in Fig. 3, the parent device microcomputer 33 includes a control signal generating unit 33d. When the high place determining unit 33c determines that the workers A1 to A5 are at a high place and the hook state detection sensor 20 detects that the hook 205 is not hooked on the fall prevention member 101, the control signal generating unit 33d generates a notification signal (one example of a control signal) to notify the surroundings (step S13). The fact that the notification signal is generated means that the workers A1 to A5 are working at a high place but have not hooked the hook 205 on the fall prevention member 101, and it can be said that the high place work by the workers A1 to A5 is in an unsafe state. In other words, the control signal generating unit 33d generates a notification signal only when the high place work by the workers A1 to A5 is in an unsafe state.

[0092] On the other hand, when the high place determination unit 33c determines that the workers A1 to A5 are not at a high place, the control signal generation unit 33d does not generate a notification signal regardless of the detection result of the hook state detection sensor 20. Also, when the hook state detection sensor 20 detects that the hook 205 is hooked on the fall prevention member 101, the control signal generation unit 33d does not generate a notification signal regardless of the determination result of the high place determination unit 33c. The notification signal generated by the control signal generation unit 33d is transmitted from the parent device side transmission unit 32 to the manager terminal 4. However, if the hook state detection sensor 20 is in the ON state or the worker has moved to the safe working height after the notification signal is generated, the control signal generation unit 33d can also generate a notification signal indicating that it is safe.

[0093] (Configuration of Administrator Terminal 4) The manager terminal 4 is configured as an information terminal carried by the manager. Examples of the manager terminal 4 include, but are not limited to, a smartphone, a tablet terminal, a notebook personal computer, etc., and may be configured as, for example, a desktop personal computer. The manager is, for example, a person who manages a work site, a supervisor who supervises, etc., and does not necessarily need to be at the work site, and may be, for example, in a management office, etc.

[0094] 3, the administrator terminal 4 includes a display unit 40, an operation unit 41, a speaker 42, an administrator receiving unit 43, an administrator microcomputer (administrator control unit) 44, and a battery 45. The display unit 40, the operation unit 41, and the speaker 42 are connected to the administrator microcomputer 44. The battery 45 can be the same as the battery 24 of the child unit 2.

[0095] 2, the display unit 40 is provided in a housing 46 of the administrator terminal 4, and is configured, for example, by a liquid crystal display or an organic EL display. The operation unit 41 is configured, for example, by a pressure-sensitive touch panel that can be operated by touch, buttons, switches, etc. In the case of a pressure-sensitive touch panel, it can be provided overlapping the display unit 40. The speaker 42 is capable of emitting various sounds.

[0096] The manager-side receiving unit 43 is a communication module capable of communicating with the parent-side transmitting unit 32, and specifically, is configured with a communication module of the same standard as the parent-side transmitting unit 32. The manager-side receiving unit 43 receives a notification signal transmitted from the parent-side transmitting unit 32.

[0097] The manager's microcomputer 44 is a part that accepts the operation of the operation unit 41 and the input of the notification signal received by the manager's receiving unit 43, and controls the display unit 40 and the speaker 42. Specifically, when the manager's microcomputer 44 accepts the input of the notification signal received by the manager's receiving unit 43, it causes the display unit 40 to notify that the high-altitude work by the workers A1 to A5 is in an unsafe state. Examples of the notification by the display unit 40 include a display form using a sentence such as "hook not attached during high-altitude work" on the display unit 40, and a form in which a symbol or mark indicating an unsafe state is displayed. In addition, when the manager's microcomputer 44 accepts the input of the notification signal received by the manager's receiving unit 43, it causes the speaker 42 to notify that the high-altitude work by the workers A1 to A5 is in an unsafe state. Examples of the notification by the speaker 42 include a voice message such as "hook not attached while working at height" from the speaker 42, and various warning sounds (alarm sounds). The display unit 40 and the speaker 42 are examples of a notification unit that notifies that the workers A1 to A5 are in an unsafe state while working at height. Only one of the display unit 40 and the speaker 42 may be provided. The notification unit may also be composed of, for example, a vibration generator that generates a predetermined vibration.

[0098] With the above configuration, when the parent machine side microcomputer 33 determines that the workers A1 to A5 are in a high place and detects that the hook 205 is not hooked on the fall prevention member 101, the parent machine side transmitter 32 transmits an alarm signal to the manager terminal 4. This controls the display unit 40 and speaker 42 of the manager terminal 4 to notify the workers A1 to A5 that they are in an unsafe state.

[0099] The display unit 40 and the speaker 42 as the notification unit may be provided in the slave units 2A to 2E in addition to the manager terminal 4. Although not shown, a speaker and a vibration generator are provided in the slave units 2A to 2E, and when the master unit side microcomputer 33 determines that the workers A1 to A5 are at a high place and detects that the hook 205 is not hooked on the fall prevention member 101, a notification signal is transmitted to the slave units 2A to 2E, whereby the speaker and the vibration generator can notify the workers A1 to A5 that they are in an unsafe state.

[0100] (Effects of the embodiment) As described above, according to the high-altitude work safety management system 1 of this embodiment, it is possible to estimate whether the workers A1 to A5 wearing the safety belt 200 are working on that floor. If the workers A1 to A5 working on the estimated floor are at a high altitude, the atmospheric pressure value output from the worker-side atmospheric pressure sensor 21 becomes lower than the atmospheric pressure value output from the reference atmospheric pressure sensors 30 and 51, and based on this difference in atmospheric pressure, the high altitude determination unit 33c can determine that the workers A1 to A5 are at a high altitude. In addition, the hook state detection sensor 20 detects whether the hook 205 of the safety belt 200 is hooked on the fall prevention member 101. If the workers A1 to A5 are at a high altitude but the hook 205 of the safety belt 200 is not hooked on the fall prevention member 101, it can be said that the high altitude work by the workers A1 to A5 is in an unsafe state. In this case, the display unit 40 and the speaker 42 can notify the workers A1 to A5 that the work at high altitude is in an unsafe state, and for example, a supervisor or a manager can be notified of this. This can warn the workers A1 to A5 to correct the unsafe state. It is also possible to notify the workers A1 to A5 themselves that the work at high altitude is in an unsafe state, so that they can correct the unsafe state and work at high altitude safely.

[0101] The above-described embodiment is merely illustrative in all respects and should not be construed as limiting. Furthermore, all modifications and variations within the scope of the claims are within the scope of the present invention. [Industrial Applicability]

[0102] As described above, the height work safety management system according to the present invention can be used, for example, in work sites where various types of height work are carried out. [Explanation of symbols]

[0103] 1. Height work safety management system 2A~2E Handsets for 1st to 5th floors 3 Parent unit 4. Administrator terminal 5B~5E Reference station for 2nd to 5th floors 20 Hook status detection sensor 21 Worker side atmospheric pressure sensor 22 Child unit transmitter 30 Reference atmospheric pressure sensor 31 Parent unit receiving section 32 Parent unit transmitter 33a Estimation part 33b Control section 40 Display unit (notification unit) 42 Speaker (notification section) 43 Administrator side receiving section 100 Work platform 101 Fall prevention parts 200 Safety Belt 205 Hook

Claims

1. In a work at height safety management system that manages workers who wear safety belts while working at height, a hook state detection sensor provided on a hook of the safety belt and detecting whether the hook is hooked on a fall prevention member that prevents a worker from falling; an atmospheric pressure sensor attached to the worker for detecting the atmospheric pressure around the worker; a first reference atmospheric pressure sensor that is configured separately from the worker-side atmospheric pressure sensor and is installed on a predetermined floor, and detects atmospheric pressure at a reference height that serves as a reference for determining whether or not a worker is at a high position on the predetermined floor; a second reference atmospheric pressure sensor that is configured separately from the worker-side atmospheric pressure sensor and the first reference atmospheric pressure sensor, that is installed on another floor different from the predetermined floor, and that detects atmospheric pressure at a reference height that serves as a reference for determining whether or not a worker is at a high place on the other floor; an estimation unit that estimates the floor where the worker is located based on the detected atmospheric pressure value output from the worker-side atmospheric pressure sensor, the detected atmospheric pressure value output from the first reference atmospheric pressure sensor, and the detected atmospheric pressure value output from the second reference atmospheric pressure sensor; a notification unit that notifies a worker that a high-altitude work is in an unsafe state; This height-work safety management system is characterized by comprising a control unit that determines whether the worker is at a height that is a predetermined height or more higher than the reference height on the floor estimated by the estimation unit based on the difference between the detected atmospheric pressure value output from the worker-side atmospheric pressure sensor and the detected atmospheric pressure value output from the reference atmospheric pressure sensor installed on the floor estimated by the estimation unit, and when it is determined that the worker is at a high altitude on the floor estimated by the estimation unit and when the hook state detection sensor detects that the hook is not in a state where it is hooked on the fall prevention member, controls the alarm unit to alert that an unsafe state exists.

2. In the height-work safety management system according to claim 1, The first reference atmospheric pressure sensor is installed on a floor lower than the second reference atmospheric pressure sensor, a detection value of the atmospheric pressure output from the worker-side atmospheric pressure sensor being equal to or less than the detection value of the atmospheric pressure output from the first reference atmospheric pressure sensor and being greater than the detection value of the atmospheric pressure output from the second reference atmospheric pressure sensor;

3. In the high-altitude work safety management system according to claim 1 or 2, a slave unit having the operator side atmospheric pressure sensor and the hook state detection sensor; a first reference station having the first reference atmospheric pressure sensor; a second reference station having the second reference atmospheric pressure sensor; A parent device having the estimation unit and the control unit; An administrator terminal having the notification unit, The slave unit is provided with a slave unit side transmitter that transmits the detected value of the atmospheric pressure output from the worker side atmospheric pressure sensor and the detection result of the hook state detection sensor, the first reference station is provided with a first reference station transmitter that transmits the detected value of atmospheric pressure output from the first reference atmospheric pressure sensor; the second reference station is provided with a second reference station transmitter that transmits the detected value of atmospheric pressure output from the second reference atmospheric pressure sensor; the master unit is provided with a master unit receiving unit that receives the detection value of the atmospheric pressure and the detection result transmitted from the slave unit transmitting unit, the first reference station transmitting unit, and the second reference station transmitting unit, respectively, and a master unit transmitting unit that outputs a control signal for the notification unit output from the control unit, A high-altitude work safety management system, characterized in that the manager terminal is provided with a manager-side receiving unit that receives the control signal transmitted from the parent unit-side transmitting unit.

4. In the height-work safety management system according to claim 3, The slave units include a first slave unit and a second slave unit that are worn by workers on different floors, the first slave unit is provided with a slave unit side receiving unit that receives the detected value of the atmospheric pressure transmitted from the slave unit side transmitting unit of the second slave unit; the slave-side transmitter of the first slave is configured to transmit the detected value of the atmospheric pressure received by the slave-side receiver, A high-altitude work safety management system characterized in that the parent unit side receiving unit is configured to receive the atmospheric pressure detection value of the first child unit and the atmospheric pressure detection value of the second child unit transmitted from the child unit side transmitting unit of the first child unit, and the atmospheric pressure detection values ​​transmitted from the first reference station transmitting unit and the second reference station transmitting unit, respectively.

5. In the height-work safety management system according to claim 4, The handset side receiving unit of the first handset is configured to receive a detection result of the hook state detection sensor, the slave-side transmitter of the first slave is configured to transmit the detection result received by the slave-side receiver, A height-work safety management system characterized in that the parent unit side receiving unit is configured to receive the detection result of the first child unit and the detection result of the second child unit transmitted from the child unit side transmitting unit of the first child unit.

6. In the high-altitude work safety management system according to claim 4 or 5, the first slave unit is worn by an operator on a floor on which the first reference station is installed; the second slave unit is worn by an operator on a floor on which the second reference station is installed; the parent machine includes a storage unit that stores a first offset value that is a difference between a detection value of the worker-side atmospheric pressure sensor of the first child machine and a detection value of the first reference atmospheric pressure sensor at the time of setting performed before the operation of the work at height safety management system, and a second offset value that is a difference between a detection value of the worker-side atmospheric pressure sensor of the second child machine and a detection value of the second reference atmospheric pressure sensor at the time of setting, The control unit is configured to apply the first offset value and the second offset value stored in the memory unit to determine whether or not a worker is at a high altitude.

7. In the height-work safety management system according to claim 6, the first offset value is a value obtained by subtracting a detection value of the first reference atmospheric pressure sensor from a detection value of the operator side atmospheric pressure sensor of the first slave unit at the time of the setting, A height-work safety management system characterized in that the control unit is configured to determine whether or not a worker is at a high altitude based on a value obtained by subtracting the detection value of the first reference atmospheric pressure sensor, the first offset value, and a predetermined threshold value from the detection value of the worker-side atmospheric pressure sensor of the first slave unit.

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