JP7628032B2 - Heights Work Safety Management System - Google Patents

Description

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 for various buildings.

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 in Patent Document 1 is equipped with a mobile terminal carried by a maintenance worker, and this mobile terminal has a built-in air pressure sensor. According to this maintenance and inspection support system, the difference in altitude between the position of the mobile terminal and the reference floor is calculated 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, the elevator car is moved to the reference floor and a message is displayed on the display device informing the user that maintenance and inspection work will be carried out.

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 acceleration sensor. The high-altitude work estimation device acquires air pressure information indicating the air pressure information at the location where the worker is present using the air pressure sensor, and determines that the worker is at a high altitude if the difference between the acquired air pressure information and the reference air pressure exceeds a predetermined threshold, and determines that the worker is not at a high altitude if the difference does not exceed the threshold. 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.

JP 2017-165521 A Patent No. 6684863

Incidentally, there are many situations in which working at heights is required during the construction, maintenance, and inspection of various buildings. Generally, workers wear safety harnesses, but if they are not hooked up while working at heights, it is not possible to prevent a fall accident in the unlikely event of one occurring.

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

In addition, in Patent Document 2, a warning is output only when the worker is at a high altitude and performing work, so even if the worker is working at a high altitude correctly by hooking the safety belt to a handrail or the like, a warning is output each time, which may be annoying. In addition, in Patent Document 2, if the worker is not moving, the acceleration is zero and 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, if the worker is at a high altitude, the safety belt must be hooked up even if the worker is not performing work, and the device in Patent Document 2 cannot handle such cases.

In addition, in Patent Documents 1 and 2, a pressure sensor is used to detect the difference in altitude between the worker and the reference floor. For example, if work is performed on the first and second floors, the system can determine that the worker is working at a height without any problems when working on the first floor, but if the worker moves to the second floor and starts working, the system may determine that the worker is working at a height, even though the work is not actually being performed, and may be subject to a warning. To avoid this, the system could be operated separately for each floor, but when workers work on different floors, they would need to change their mobile device for each floor, which would make it difficult to use. In addition, if a worker forgets to change their mobile device when moving to a higher floor, they may be erroneously warned, and if a worker forgets to change their mobile device when moving to a lower floor, the system may determine that the worker is not working at a height, even though the worker is working at a height.

The present invention was made in consideration of these points, and its purpose is to make it possible to safely work at heights by preventing workers from forgetting to fasten their safety belts when working at heights, even when work is being done on multiple floors.

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 workers who wear safety belts and work at height. The high-altitude work safety management system includes a hook state detection sensor that is attached to the hook of the safety belt and detects whether the hook is attached to a fall prevention member that prevents the worker from falling, a worker-side atmospheric pressure sensor that is attached to the worker and detects the 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 the atmospheric pressure at a reference height that is the 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 the atmospheric pressure at a reference height that is the reference for determining whether the worker is at a high altitude on the other floor, and a detection value of the atmospheric pressure output from the worker-side atmospheric pressure sensor. The device includes an estimation unit that estimates the floor where the 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 the worker is working at a height that is unsafe, 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 controls the notification unit to notify the worker that the worker is at a height on the floor estimated by the estimation unit when the hook state detection sensor detects that the hook is not attached to the fall prevention member.

According to this configuration, if 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 altitude 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 altitude 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 atmospheric pressure value output from the worker-side atmospheric pressure sensor, the detected atmospheric pressure value at the reference height on the first floor, and the detected atmospheric pressure value at the reference height on the second floor. For example, if the detected atmospheric pressure value output from the worker-side atmospheric pressure sensor is higher than the detected atmospheric pressure value 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 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 the worker is on the second floor.

After estimating the floor where the worker is in this way, if the worker is at a high altitude (e.g., 2 m or more above 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 located at the reference height, and the control unit can determine that the worker is at a high altitude 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 rope. If the worker is at a high altitude 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 altitude 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 altitude 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 altitude.

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 on which the first reference atmospheric pressure sensor is installed when the detected atmospheric pressure value output from the worker-side atmospheric pressure sensor is equal to or lower than the detected atmospheric pressure value output from the first reference atmospheric pressure sensor and is greater than the detected atmospheric pressure value output from the second reference atmospheric pressure sensor.

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

In a third aspect of the present disclosure, a child machine 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 parent machine having the estimation unit and the control unit, and an administrator terminal having the notification unit, the child machine is provided with a child-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, and the first reference station is provided with a child-side transmitter that transmits the detected value of the atmospheric pressure output from the first reference atmospheric pressure sensor. The first reference station transmitter is provided to transmit the atmospheric pressure detection value output from the second reference atmospheric pressure sensor, the second reference station is provided with a second reference station transmitter that transmits the atmospheric pressure detection value and the detection result transmitted from the child unit side transmitter, the first reference station transmitter, and the second reference station transmitter, respectively, and the parent unit is provided with a parent unit side receiver that outputs a control signal for the notification unit output from the control unit, and the manager terminal is provided with a manager side receiver that receives the control signal transmitted from the parent unit side transmitter.

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 atmospheric pressure at the reference height of each floor transmitted from the first and second reference stations and the detected values of atmospheric pressure corresponding to the height of the worker transmitted from the child unit, and based on the received detected values, can estimate the floor on which the worker is located, determine whether work at height is being performed on each floor, and determine the state of the hook. In other words, while the estimation unit and control unit are consolidated in the parent unit, it is possible to grasp unsafe conditions on each floor and give appropriate instructions to the worker.

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 detected value of the 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 detected value of the atmospheric pressure received by the slave unit side receiving unit, and the master unit side receiving unit is configured to receive the detected value of the atmospheric pressure of the first slave unit and the detected value of the atmospheric pressure of the second slave unit transmitted from the slave unit side transmitting unit of the first slave unit, and the detected values of the atmospheric pressure transmitted from the first reference station transmitting unit and the second reference station transmitting unit, respectively.

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 atmospheric pressure detection value 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 atmospheric pressure detection value transmitted from the second child unit.

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 base 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.

With 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.

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, the second slave unit is worn by a worker on a floor where the second reference station is installed, and the master unit includes a memory unit that stores a first offset value that 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 performed before the operation of the work at height safety management system, and a second offset value that 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, 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 the worker is at a high altitude.

This configuration makes it possible to accurately determine whether workers on each floor are at high altitudes.

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 the 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.

As described above, the floor on which the worker is located can be estimated based on the atmospheric pressure detection value output from the worker's side atmospheric pressure sensor, the atmospheric pressure detection value output from the first reference atmospheric pressure sensor, and the atmospheric pressure detection value output from the second reference atmospheric pressure sensor. This makes it possible to ensure that the worker does not forget to fasten the safety belt when working at height, and allows the worker to work at height safely, even when work is being performed on multiple floors.

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. FIG. 2 is a schematic diagram of the above-mentioned high-altitude work safety management system. FIG. 2 is a block diagram of the above-mentioned work-at-height safety management system. FIG. 2 is a diagram illustrating a first example of an operation form of the above-mentioned high-altitude work safety management system. FIG. 11 is a diagram illustrating a second example of an operation form of the above-mentioned high-altitude work safety management system. FIG. FIG. 2 is a block diagram of a reference station. 3 is a control flowchart of the above-mentioned high-altitude work safety management system. 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. 11 is a diagram illustrating a method for calculating an offset value when a parent device and a child device are paired. FIG. FIG. 2 is a diagram illustrating the operation of the above-mentioned high-altitude work safety management system.

The following describes in detail an embodiment of the present invention with reference to the drawings. Note that the following description of the preferred embodiment is essentially merely an example and is not intended to limit the present invention, its applications, or its uses.

Figure 1 is a diagram showing a work site where a work at height safety management system 1 (shown in Figures 2 and 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 this 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 machines, work on high work platforms, 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 ground is taken as the reference height, and may follow the definition in the Industrial Safety and Health Act.

As shown in FIG. 1, the work site is provided with a work floor 100 on which worker A walks and performs various tasks, and a fall prevention member 101. The work floor 100 is a floor for performing work at height, and is located at a height that is a certain level higher than the 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 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 part of various structures.

Worker A wears a safety belt 200 in preparation for working at height. In this embodiment, the 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 Worker A, a leg belt 202 wrapped around the thighs, a shoulder belt 203 extending from the waist belt 201 to the shoulders, and hooks 205 attached to the ends of ropes 204 extending to the left and right from the waist belt 201. Note that the present invention can also be applied to safety belts other than the full harness type safety belt 200, for example, a safety belt without the leg belt 202 or shoulder belt 203. Also, only one hook 205 may be provided.

Figure 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 Figure 3) worn by a worker A, a master unit 3 installed away from the slave units 2A to 2E, an administrator 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 above short-distance wireless communication, and may be a communication form by an Internet line, a local area network line, or the like. The master unit 3 and the administrator terminal 4 can be connected, for example, via 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 communication methods will be explained later.

The work at height safety management system 1 is a system that manages worker A who wears a safety belt 200 and works at height. Managing worker A involves determining whether worker A is working at height in an unsafe manner, 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 worker A himself, to let him know that it is unsafe and to have him improve the situation. Using this work at height safety management system 1 makes it possible to manage worker A. Details of the work at height safety management system 1 are explained below.

(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 based on 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 of 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 applies to the third, fourth, and fifth floors. Note that the number of workers A1 to A5 and the number of floors of the building 105 are not limited to those shown in the figure, and may be any number of people and any number of floors. In addition, work may be performed simultaneously on all floors, or may be performed only on some floors. Furthermore, the floor on which work is performed may be the basement.

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 ease 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 they are paired with a reference station installed on each floor (described later), 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.

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.

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 master unit 3 installed on the 1st floor, and the communication form between the master 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.

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 to 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 due to distance, the fourth floor handset 2D does not need to be used. Similarly, various detection values and detection results detected by the fourth floor handset 2D can be transmitted to the parent 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 parent unit 3 via the second floor handset 2B. In this case, the first floor handset 2A may be used.

As shown in FIG. 1, the first to fifth floor handset units 2A to 2E can be attached to the safety belt 200 and can be integrated with the safety belt 200. As shown in this figure, the first to fifth floor handset units 2A to 2E are attached to the hook 205 and are integrated with the hook 205. The first to fifth floor handset units 2A to 2E can also be built into the base end of the hook 205, which is the part to which the rope 204 is connected. Note that the first to fifth floor handset units 2A to 2E can be attached to the waist belt 201 of the safety belt 200 at a part other than the hook state detection sensor 20 described later, or can be attached to the workers A1 to A5 without going through the safety belt 200.

Figure 6 is a block diagram showing the detailed structure of the first floor handset 2A. As shown in this figure, the first floor handset 2 is equipped with a hook state detection sensor 20, an operator side atmospheric pressure sensor 21, a handset side transmitter 22, a handset side receiver 23, a handset side microcomputer (handset 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 operator A, etc.

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 contacts the fall prevention member 101 due to the weight of the hook 205. This hook state detection sensor 20 can be configured as 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 as 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.

All or some of the worker-side atmospheric pressure sensor 21, the slave-side transmitter 22, the slave-side receiver 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 transmitter 22, the slave-side receiver 23, the slave-side microcomputer 24, and the battery 25 may be configured to be attachable to an existing hook 205.

The worker-side atmospheric pressure sensor 21 is attached to the workers A1 to A5 and detects the atmospheric pressure around the workers A1 to A5. It is composed of a conventionally known atmospheric pressure sensor. In this embodiment, the worker-side atmospheric pressure sensor 21 is built into the hook 205. However, the hook 205 and the workers A1 to A5 are not so far apart in the vertical direction. 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 if 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 for the worker-side atmospheric pressure sensor 21 to have a short atmospheric pressure detection cycle, but taking into account the consumption of the battery 25, the worker-side atmospheric pressure sensor 21 detects 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 detection value by the worker-side atmospheric pressure sensor 21 is input to the slave-side microcomputer 24.

The slave side transmitter 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 transmitter 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 according to instructions from the slave side microcomputer 24. Each 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 transmitter 22 to the outside.

The detected value of atmospheric pressure and the detection result by the hook state detection sensor 20 are provided with identification information to identify which of the sub-units 2A-2E they are, and the detected value of atmospheric pressure with the identification information and the detection result with the identification information are transmitted to the outside. Examples of the identification information include, but are not limited to, an ID number unique to the sub-units 2A-2E, or a different number assigned to each sub-unit by the administrator, and can include various types of identification information. Even sub-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-A5, and the administrator holds the wearing information of which worker A is wearing which sub-unit.

In the first example shown in FIG. 4, the slave device side transmitter 22 is configured with a communication module capable of wireless communication with the Internet line or a local area network line. On the other hand, in the second example shown in FIG. 5, the slave device side transmitter 22 is configured with a communication module capable of short-range wireless communication, such as 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.

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

The handset-side transmitter 22 of each of the handset units 2A to 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. In other words, 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 with the identification information added to it to the outside, without deleting the identification information added to the detection value and the detection result. Because the first to fifth floor slaves 2A to 2E are configured in this manner, as shown by the communication paths in FIG. 5 with dashed lines, the detection value and detection results for the fifth floor transmitted from the slave side transmitter 22 of the fifth floor slave 2E are 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, then 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, then 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 then received by the parent unit 3. This type of communication form is called multi-hopping.

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 transmitter 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.

The battery 25 is for supplying power to the hook state detection sensor 20, the worker side atmospheric pressure sensor 21, the handset side transmitter 22, the handset side receiver 23, and the handset side microcomputer 24. The battery 25 may be a rechargeable battery or a replaceable dry cell.

(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 altitude detection algorithm described later.

In this specification, the reference stations 5B to 5E are referred to as the reference stations for the second to fifth floors 5B to 5E, but this is for ease of explanation, and the structures of the reference stations for the second to fifth floors 5B to 5E are all the same. Therefore, as long as the reference station for the second floor 5B 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 for the second floor 5B must be used on the second floor, and if the reference station for the second floor 5B 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.

The reference stations 5B to 5E for the second to fifth floors may be installed on the floor of each floor, on a stand, or on a tripod-like 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 can be used.

Figure 7 is a block diagram showing the detailed structure of the second floor reference station 5B. As shown in this figure, the second floor reference station 5B is equipped with 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 material as the 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 housed and integrated in a single housing 56, but it is also possible to house only some of them in the housing 56 and house the others in a separate housing (not shown).

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 worker A2 on the second floor 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.

The reference atmospheric pressure sensor 51 is installed in the second floor reference station 5B, so when worker A2 on the second floor is working, it is positioned away from the worker-side atmospheric pressure sensor 21 of the second floor slave unit 2A, and detects atmospheric pressure at a different height than the worker-side atmospheric pressure sensor 21 of the second floor slave unit 2A. Specifically, since 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, such as the height of the floor, ground, or workbench, while worker A2 is working.

The reference station transmitter 52 is configured with a communication module similar to the slave unit transmitter 22 of the slave units 2A to 2E used in the height work safety management system 1 according to the first example. In other words, the reference station transmitter 52 is configured with a communication module capable of communication using a communication form such as an Internet line or a local area network line. The reference station transmitter 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.

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. Each time the detected value of atmospheric pressure is input to the reference station microcomputer 53, the reference station microcomputer 53 causes the detected value to be transmitted from the reference station transmitter 52 to the outside.

(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 lower part of a workbench. The parent unit 3 only needs to be installed so as not to 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.

As shown in FIG. 3, the parent unit 3 includes a reference atmospheric pressure sensor 30, a parent unit receiving unit 31, a parent unit transmitting unit 32, a parent unit microcomputer 33, a memory unit 34, and a battery 35. The battery 35 can be configured to be the same as the battery 25 of the child units 2A to 2E. Instead of the battery 35, power may be supplied from a commercial power source, etc.

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 rest in a separate housing (not shown).

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 the reference for determining whether the worker A1 on the first floor is at a high altitude, 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 different height from 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.

The parent device receiving unit 31 has a communication module capable of communicating with the reference stations 5B to 5E for the second to fifth floors, and specifically has a communication module of the same standard as the reference station transmitter 52 of the reference stations 5B to 5E for the second to fifth floors. Furthermore, the parent device receiving unit 31 has a communication module capable of communicating with the child devices 2A to 2E for the first to fifth floors, and specifically has a communication module of the same standard as the child device transmitter 22 of the child devices 2A to 2E for the first to fifth floors. In other words, the parent device receiving unit 31 can be configured to have a communication module capable of wireless communication with an Internet line or a local area network line, and a communication module capable of short-range wireless communication of LPWA.

However, in the first example shown in FIG. 4, the slave unit transmitter 22 of the slave units 2A to 2E for the first to fifth floors is a communication module capable of wireless communication with the Internet or a local area network, so a communication module capable of short-range wireless communication of LPWA is not necessary, and therefore the master unit 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 unit receiver 31 receives the atmospheric pressure detection value transmitted from the slave unit transmitter 22 of the slave units 2A to 2E for the first to fifth floors, i.e., the atmospheric pressure detection value detected by the worker-side atmospheric pressure sensor 21 of the slave units 2A to 2E for the first to fifth floors, and also receives the detection result of the hook state detection sensor 20 of the slave units 2A to 2E for the first to fifth floors.

On the other hand, in the second example shown in FIG. 5, the slave unit transmitter 22 of the slave units 2A to 2E for the first to fifth floors is a communication module capable of short-range wireless communication using LPWA, so the master unit receiver 31 is configured to also have a communication module capable of short-range wireless communication. In the second example, the detection values and detection results transmitted from the slave units 2C to 2E installed far from the master unit 3, such as on the third to fifth floors, are transmitted by the above-mentioned multi-hopping and received by the master unit receiver 31. Also, the detection values and detection results transmitted from the slave units 2A and 2B installed close to the master unit 3, such as on the first and second floors, are directly received by the master unit receiver 31.

The parent unit transmitter 32 shown in FIG. 3 is a part that outputs a control signal output from the parent unit microcomputer 33, as described later. The parent unit transmitter 32 may be configured with a communication module similar to the child unit transmitter 22, or may be configured with a communication module capable of wireless communication with an Internet line or a local area network line.

The parent microcomputer 33 is a part that remotely controls the speaker 42 and display unit 40 of the administrator terminal 4 described below. The parent microcomputer 33 is equipped with an estimation unit 33a for estimating the floor on which the worker is located, and a control unit 33b including an elevation determination unit 33c for determining whether the worker is at a high altitude on the estimated floor. The estimation unit 33a and 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.

The estimation unit 33a is a part that estimates the floor where the worker is located based on the atmospheric pressure detection value output from the worker-side atmospheric pressure sensor 21 and the atmospheric pressure detection values output from the reference atmospheric pressure sensors 51, 30 installed on different floors. Details will be described later, but "different floors" refers to floors adjacent to each other above and below, such as the first and second floors, or the second and third floors. In the case of the first floor, the atmospheric pressure detection value is output from the reference atmospheric pressure sensor 30 of the parent unit 3, but in the cases of the second to fifth floors, the atmospheric pressure detection value is output from the reference atmospheric pressure sensors 51 of the reference stations 5B to 5E.

The high altitude determination unit 33c determines whether or not the worker A is at a height higher than the reference height by a predetermined amount 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 or not 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 parent unit 3 installed on the first floor. When determining whether or not 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.

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

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 detection value detected by the worker side atmospheric pressure sensor 21 to the master unit 3, which inputs it to the master unit side microcomputer 33.

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

In step S6, the estimation unit 33a sets the lowest floor included in the information about the building 105 as i, and executes the calculation j = i + 1. The information about the building 105 is input in advance by the administrator or user, and is stored in the memory unit 34 of the parent unit 3. The estimation unit 33a obtains the information about the lowest floor from the memory unit 34. The lowest floor is the lowest floor 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 no work is 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.

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 the offset value is calculated as shown in FIG. 10. This will be explained in detail later.

When setting up the height work safety management system 1, first install the parent unit 3 at the installation location, attach the first floor handset 2A to the first floor worker A1, and have the worker A1 wearing the first floor handset 2A stand at the same height as the installation location 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.

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 differences in the detection values. 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 position of the parent unit 3. In order to prevent the estimation unit 33a from making an estimation error and the high altitude 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 SSD (Solid State Drive), and is capable of recording and reading data. In addition, an offset value is calculated for each worker A1 for all workers A1, and the offset value is stored in an identifiable manner.

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

Figure 9 shows an example of calculating the offset value between the operator side atmospheric pressure sensor 21 of the three first floor slave units 2A-1 to 2A-3 and the reference atmospheric pressure sensor 30 of the parent unit 3. Figure 9 shows a case where 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 parent unit 3. When calculating the offset value, the first floor slave unit 2A-1, the first floor slave unit 2A-2, the first floor slave unit 2A-3 and the parent unit 3 are positioned at approximately the same height, and the 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 detection value of the worker-side atmospheric pressure sensor 21 minus the detection value of the master unit reference atmospheric pressure sensor 30, i.e., -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 way.

Figure 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 Figure 10, unlike the case of Figure 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's 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.

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 detection value of the worker-side atmospheric pressure sensor 21 minus the detection value of the reference atmospheric pressure sensor 30, i.e., -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.

In step S7 of the flowchart shown in FIG. 8, the estimation unit 33a calculates calculated value 1 and calculated value 2. Calculated value 1 is obtained by adding the detected value of the atmospheric pressure on the i floor to the i floor offset value, and then subtracting the allowable error. Calculated value 2 is obtained by adding the detected value of the atmospheric pressure on the j floor to 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.

Then, proceed to step S8. In step S8, the detected value of the atmospheric pressure detected by any one of the slave units 2A to 2E (slave unit atmospheric pressure value) is read, and it is determined whether the slave unit atmospheric pressure value is equal to or less than calculated value 1 and greater than calculated value 2. If the determination is YES in step S8, it can be determined that the slave unit atmospheric pressure was 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.

If the result of step S8 is NO, the process proceeds to step S9, where calculations i = i + 1 and j = i + 1 are performed. In step S10, it is determined whether the i found in step S9 is the top floor. Whether it is the top floor or not 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 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 carried out.

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

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 workers A1 to A5 on the floor estimated by the estimation unit 33a are at a high altitude, and if multiple offset values are stored, for example, the first offset value, the second offset value, ... are applied respectively to determine whether workers A1 to A5 are at a high altitude.

The details of steps S11, S12, and S13 are 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 the 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.

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 slave units 2A-1 to 2A-3 are present. The first offset value between the parent unit 3 and the first floor slave unit 2A-1 is -18.444 Pa, the second offset value between the parent unit 3 and the first floor slave unit 2A-2 is -15.256 Pa, and the third offset value between the parent unit 3 and the first floor slave unit 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 the work is at 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, when the high place work safety management system 1 is operated, the parent unit 3 is installed at the reference height. Let's say the detection value of the reference atmospheric pressure sensor 30 of this parent unit 3 is 10611.234 Pa.

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

Let us also assume that worker A1 wearing the first-floor handset 2A-2 is standing on a work platform, and the detection value of the worker-side atmospheric pressure sensor 21 of the first-floor handset 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 parent 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 handset 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.

Let us also assume that worker A1 wearing the first-floor handset 2A-3 is standing on the lifting device, and the detection value of the worker-side atmospheric pressure sensor 21 of the first-floor handset 2A-3 is 10480.678 Pa. In this case, the high-altitude determination unit 33c performs the following calculation. The value (Z) obtained by subtracting the detection value of the reference atmospheric pressure sensor 30 of the parent 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 handset 2A-3 is -87.7 Pa. Since Z<0, the high-altitude determination unit 33c determines that worker A1 is in a place defined as a high altitude.

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

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

As shown in FIG. 3, the parent device microcomputer 33 includes a control signal generating unit 33d. When the high altitude determining unit 33c determines that the workers A1 to A5 are at a high altitude 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 an alarm signal (one example of a control signal) to notify the surroundings (step S13). The generation of the alarm signal means that the workers A1 to A5 are working at a high altitude but have not hooked the hook 205 on the fall prevention member 101, and the high altitude work by the workers A1 to A5 is in an unsafe state. In other words, the control signal generating unit 33d generates an alarm signal only when the high altitude work by the workers A1 to A5 is in an unsafe state.

On the other hand, when the high altitude determination unit 33c determines that the workers A1 to A5 are not at a high altitude, the control signal generation unit 33d does not generate an alarm 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 an alarm signal regardless of the determination result of the high altitude determination unit 33c. The alarm signal generated by the control signal generation unit 33d is transmitted from the parent unit transmission unit 32 to the manager terminal 4. However, if the hook state detection sensor 20 detects that the worker has moved to a safe working height after the alarm signal is generated, the control signal generation unit 33d can also generate an alarm signal to the effect that it is safe.

(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.

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

As shown in FIG. 2, the display unit 40 is provided in the housing 46 of the administrator terminal 4, and is configured, for example, with a liquid crystal display or an organic EL display. The operation unit 41 is configured, for example, with 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.

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

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 workers A1 to A5 are working at height in an unsafe state. Examples of notifications by the display unit 40 include displaying a sentence such as "hook not attached during work at height" on the display unit 40, or displaying a symbol or mark indicating an unsafe state. 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 workers A1 to A5 are working at height in an unsafe state. Examples of notifications by the speaker 42 include a voice message such as "hook not attached while working at height" and various warning sounds (alarm sounds). The display unit 40 and speaker 42 are examples of a notification unit that notifies that workers A1 to A5 are in an unsafe state 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 specified vibration.

With the above configuration, when the parent unit microcomputer 33 determines that the workers A1 to A5 are at a high altitude and detects that the hook 205 is not attached to the fall prevention member 101, the parent unit 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.

The display unit 40 and 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.

(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, 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 height is in an unsafe state, and for example, a supervisor or 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 height is in an unsafe state, so that they can correct the unsafe state and work at height safely.

The above-described embodiments are merely illustrative in all respects and should not be interpreted as limiting. Furthermore, all modifications and variations within the scope of the claims are within the scope of the present invention.

As described above, the high-altitude work safety management system of the present invention can be used, for example, at work sites where various high-altitude work is carried out.

1 Height work safety management system 2A to 2E 1st to 5th floor slave 3 Master 4 Manager terminal 5B to 5E 2nd to 5th floor reference station 20 Hook state detection sensor 21 Worker side atmospheric pressure sensor 22 Slave side transmitter 30 Reference atmospheric pressure sensor 31 Master side receiver 32 Master side transmitter 33a Estimation unit 33b Control unit 40 Display unit (alert unit)
42 Speaker (alarm unit)
43 Manager side receiving unit 100 Work floor 101 Fall prevention member 200 Safety belt 205 Hook

Claims (7)

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 for 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. 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; In the height-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. 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 for receiving 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. 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. In the height-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. 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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