Safety management system for high-attitude work

Abstract

To ensure that safety belts are not forgotten to be hooked up for high-attitude work so that the high-attitude work can be performed safely.SOLUTION: A safety management system for high-attitude work 1 includes: hook status detection sensors 20A and 20B; a worker-side atmospheric pressure sensor 51; a reference atmospheric pressure sensor 31 that detects atmospheric pressure at a reference height; an estimation unit 54 that estimates whether a worker is at a height based on the detected value of atmospheric pressure output from the worker-side atmospheric pressure sensor 51 and the detected value of atmospheric pressure output from the reference atmospheric pressure sensor 31; and a control unit 56 that controls a reporting unit 55 to report that the worker is in a state of insecurity when the worker is estimated to be at a height by the estimation unit 54 and when the hook is determined by the detection results of the hook status detection sensors 20A and 20B to be not in a state where the hook is hung on a fall prevention member 111.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a high-altitude work safety management system used to ensure safety when working at height. [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, for example, there are cases where workers climb onto a power transmission tower and perform various tasks on the tower. The workers who work on the tower wear safety belts, but if they do not fasten the safety belt hooks while working on the tower, 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 every time, and it is considered that the warning is 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 he is on top of a steel tower, he must hook up the safety belt, and the device in Patent Document 2 cannot handle such a case.

[0008] The present disclosure has been made in consideration of the above points, and an object of the present disclosure is to enable working at heights to be performed safely by preventing a worker from forgetting to fasten a safety belt when working at heights. [Means for solving the problem]

[0009] 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 harnesses and perform high-altitude work such as tower work. The height-work safety management system comprises a hook state detection sensor attached to a hook of the safety belt and detecting whether the hook is attached to a fall prevention member that prevents the worker from falling; a worker-side atmospheric pressure sensor worn by the worker and detecting the atmospheric pressure around the worker; a reference atmospheric pressure sensor configured separately from the worker-side atmospheric pressure sensor and worn by a manager on the ground and detecting the atmospheric pressure at a reference height that serves as a reference for determining whether the worker is at a high altitude; an estimation unit that estimates whether the worker is at a high altitude based on 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; an alarm unit that alarms when the worker is working at a high altitude in an unsafe state; and a control unit that controls the alarm unit to alarm when the estimation unit estimates that the worker is at a high altitude and the detection result of the hook state detection sensor determines that the hook is not attached to the fall prevention member.

[0010] According to this configuration, when the detected value of atmospheric pressure output from the worker-side atmospheric pressure sensor is lower than the detected value of atmospheric pressure output from the reference atmospheric pressure sensor worn by the manager on the ground by a predetermined amount or more, the estimation unit estimates that the worker is at a high altitude. 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 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 causes the notification unit to notify that the worker's work at a high altitude is in an unsafe state, and can inform, for example, the worker himself or a manager of the situation. This allows the worker to be warned to correct the unsafe state.

[0011] A work at height safety management system according to a second aspect of the present disclosure includes a parent unit having the worker-side atmospheric pressure sensor, the estimation unit, the notification unit, and the control unit, and worn by a worker, and a reference unit having the reference atmospheric pressure sensor and worn by a manager. The reference unit has a reference unit-side transmitter that transmits the detected value of atmospheric pressure output from the reference atmospheric pressure sensor to the estimation unit, and the parent unit has a parent unit-side receiver that receives the detected value of atmospheric pressure transmitted from the reference unit-side transmitter. The estimation unit can estimate whether or not a worker is at a high altitude based on the detected value of atmospheric pressure received by the parent unit-side receiver and the detected value of atmospheric pressure output from the worker-side atmospheric pressure sensor.

[0012] That is, the height of a steel tower may be several tens or even a hundred meters, and even if an unsafe condition is reported to a manager on the ground, it may take time to notify the worker on the tower, and it may be difficult to do so. According to this aspect, the parent unit worn by the worker can estimate an unsafe condition and issue a report when an unsafe condition is estimated, thereby shortening the time from when an unsafe condition occurs to when the worker is notified of the condition.

[0013] The hook according to the third aspect of the present disclosure has a hook-side transmitter that transmits the detection result of the hook state detection sensor to the estimation unit. The parent unit receiver is configured to receive the detection result transmitted from the hook-side transmitter. In this case, the control unit can be configured to determine whether the hook is in a state where it is hooked on the fall prevention member based on the detection result received by the parent unit receiver. According to this configuration, the detection result of the hook state detection sensor is transmitted to the estimation unit by communication between the hook-side transmitter and the parent unit receiver, and can be used to estimate whether or not it is in an unsafe state.

[0014] A master unit according to a fourth aspect of the present disclosure has a master unit-side transmitter that transmits an alarm signal to notify the user of an unsafe state. In this case, the reference unit has a reference unit-side receiver that receives the alarm signal transmitted from the master unit-side transmitter, and notifies the user of an unsafe state based on the alarm signal received by the reference unit-side receiver.

[0015] The hook state detection sensor according to the fifth aspect of the present disclosure may include a first hook state detection sensor provided on a hook of a first lanyard and a second hook state detection sensor provided on a hook of a second lanyard. In this case, when it is determined that the hook is hooked on the fall prevention member based on either the detection result of the first hook state detection sensor or the detection result of the second hook state detection sensor, the control unit can control the notification unit not to notify of an unsafe state.

[0016] That is, when a worker moves, for example, on a steel tower, there are cases where the hook of the second lanyard is detached from the fall prevention member while the hook of the first lanyard is attached to the fall prevention member. In such a case, safety is guaranteed by the first lanyard, so it is not an unsafe state. Conversely, when the worker moves with the hook of the first lanyard detached from the fall prevention member while the hook of the second lanyard is attached to the fall prevention member, it is also not an unsafe state. In such a case, it is possible to prevent the notification of an unsafe state. Effect of the Invention

[0017] As described above, it is possible to estimate whether or not a worker is at a high altitude based on the detected atmospheric pressure value output from the worker-side atmospheric pressure sensor worn by the worker working at a high altitude and the detected atmospheric pressure value output from the reference atmospheric pressure sensor worn by the manager on the ground, thereby making it possible to ensure that the worker does not forget to fasten the hook of the safety belt when working at a high altitude, thereby enabling the worker to work at a high altitude safely. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a diagram showing a work site where a tower work safety management system according to an embodiment of the present invention is used. [Diagram 2] FIG. 1 is a diagram showing a worker performing tower work. [Diagram 3] FIG. 2 is a schematic configuration diagram of the tower work safety management system. [Figure 4] FIG. 2 is a block diagram of the tower work safety management system. [Diagram 5] 4 is a flowchart showing an example of the operation of the tower work safety management system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, the embodiments of the present invention will be described in detail with reference to the 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.

[0020] FIG. 1 is a diagram showing a work site where a tower work safety management system (height work safety management system) 1 according to an embodiment of the present invention is used. As shown in this figure, a worker A climbs to the top of a power transmission tower 100 and may perform various tasks on top of the tower 100. Work performed on top of the tower 100 is called tower work. Meanwhile, on the ground, there is a manager B who manages the tower work. Manager B can also be called a supervisor. Manager B may be located below the tower 100 or in a management office (not shown). The number of managers B is not particularly limited and may be two or more.

[0021] Since the height of the steel tower 100 is, for example, several tens of meters or several hundred meters, the worker A and the manager B may be several tens of meters or more apart. Manager B manages the steel tower work of worker A, but since the height of the steel tower 100 is several tens of meters or several hundred meters, it is difficult for manager B on the ground to visually check the worker A on top of the steel tower 100. For this reason, it is difficult to judge from the ground whether the safety belt 200 is being used correctly.

[0022] FIG. 2 is a diagram showing a worker A performing tower work. At the tower work site, a member 110 is provided to serve as a foothold for worker A to walk and work on. If the member 110 that serves as a foothold is not provided, part of the members constituting the tower 100 serves as the foothold. In addition, a fall prevention member 111 is also provided at the tower work site. The fall prevention member 111 is a member for preventing worker A from falling, and examples of the fall prevention member 111 include handrails and ropes stretched across the tower, but are not limited to these, and may be part of the members constituting the tower 100.

[0023] 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 first lanyard 204 and a second lanyard 206 extending from the waist belt 201 to the left and right. The first lanyard 204 and the second lanyard 206 have a first hook 205 and a second hook 207, respectively. The first hook 205 and the second hook 207 are attached to the tip of the first lanyard 204 and the second lanyard 206. The present invention can 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 the shoulder belt 203. The number of lanyards (the number of hooks) may be one.

[0024] 3 is a schematic diagram showing an example of the configuration of the tower work safety management system 1. The tower work safety management system 1 is a system for managing a worker A who wears a safety belt 200 and performs tower work. The management of worker A means judging whether or not worker A is performing unsafe tower work, and if the tower work is safe, allowing the worker A to continue the tower work without any special notification, and if the tower work is unsafe, notifying, for example, a manager B or worker A himself, that the tower work is unsafe and making him improve it. By using this tower work safety management system 1, the safety management of worker A becomes possible.

[0025] As shown in FIG. 4, the tower work safety management system 1 includes a first hook side device 2A, a second hook side device 2B, a parent device 5, and a reference device 3. As shown in FIG. 3, the first hook side device 2A, the second hook side device 2B, and the parent device 5 are devices worn by the worker A. Specifically, the first hook side device 2A is attached to the first hook 205, and the second hook side device 2B is attached to the second hook 207. Thus, the first hook 205 has the first hook side device 2A, and the second hook 207 has the second hook side device 2B. The parent device 5 is attached to, for example, a helmet or belt of the worker A, but the attachment location is not particularly limited. The reference device 3 is attached to, for example, a helmet or belt of the manager B, but the attachment location is not particularly limited. Furthermore, the reference device 3 may be configured as, for example, a smartphone, a tablet terminal, a notebook personal computer, or the like.

[0026] As shown in Fig. 4, the first hook side device 2A has a first hook state detection sensor 20A, a first hook side transmission unit 21A, a first hook side microcomputer 22A, and a first battery 23A. As shown in Fig. 3, the first hook state detection sensor 20A is provided on the inner periphery of the first hook 205, that is, on the part of the first hook 205 that contacts the drop prevention member 111 (shown in Fig. 2), and is a sensor for detecting whether the first hook 205 is in a state of being hung on the drop prevention member 111. When the first hook 205 is hung on the drop prevention member 111, the first hook state detection sensor 20A comes into contact with the drop prevention member 111 due to the weight of the first hook 205. This first hook state detection sensor 20A 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) upon contact with the fall prevention member 111. The first hook state detection sensor 20A 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 value. A signal line (not shown) extending from the first hook state detection sensor 20A is connected to the first hook side microcomputer 22A, and the detection result by the first hook state detection sensor 20A is input to the first hook side microcomputer 22A.

[0027] The first hook side microcomputer 22A is a part that receives the input of the detection result by the first hook state detection sensor 20A and controls the first hook side transmission unit 21A and the like. The first hook side transmission unit 21A is composed of a communication module and the like for transmitting the detection result of the first hook state detection sensor 20A to an estimation unit 54 (described later) of the master unit 5. The form of communication with the master unit 5 is not particularly limited, but may be, for example, short-distance wireless communication of LPWA (Low Power Wide Area). The first battery 23A is for supplying the necessary power to the first hook state detection sensor 20A, the first hook side transmission unit 21A, and the first hook side microcomputer 22A, and may be either a primary battery or a secondary battery. The first hook side transmission unit 21A, the first hook side microcomputer 22A, and the first battery 23A may be housed in the same housing, or some of them may be housed in a housing different from the others. The first hook side transmitting unit 21A, the first hook side microcomputer 22A, and the first battery 23A may be provided integrally with the first hook 205, or may be provided separately from the first hook 205.

[0028] The second hook side device 2B is configured similarly to the first hook side device 2A. That is, the second hook side device 2B has a second hook state detection sensor 20B consisting of a sensor for detecting whether the second hook 207 is hooked on the drop prevention member 111, a second hook side transmission unit 21B, a second hook side microcomputer 22B, and a second battery 23B. The detection result by the second hook state detection sensor 20B may be input to the first hook side microcomputer 22A and transmitted to the parent device 5 from the first hook side transmission unit 21A.

[0029] The reference machine 3 has a reference atmospheric pressure sensor 31, a reference machine side receiving section 32, a reference machine side transmitting section 33, a reference machine side microcomputer 34, a battery 35, and a housing 36 that houses them. The reference atmospheric pressure sensor 31 is configured separately from the operator side atmospheric pressure sensor 51 (described later) of the parent machine 5, and is attached to the manager B on the ground. It is a sensor for detecting the atmospheric pressure at a reference height that is a reference for determining whether the worker A is on the tower 100 or not, and is configured by a conventionally known atmospheric pressure sensor. In this embodiment, an example in which the reference atmospheric pressure sensor 31 is housed in the housing 36 of the reference machine 3 will be described, but the reference atmospheric pressure sensor 31 may be, for example, independently attached to the manager B. By attaching the reference atmospheric pressure sensor 31 to the manager B, the height at which the manager B is located, that is, the atmospheric pressure near the ground, can be detected by the reference atmospheric pressure sensor 31. The reference atmospheric pressure sensor 31 outputs a detection value of the atmospheric pressure at a short period of, for example, several tens of msec.

[0030] The reference unit side receiving unit 32 is a part that receives an alarm signal transmitted from the parent unit side transmitting unit 53 described later. The reference unit side transmitting unit 33 is a part that transmits the detected value of atmospheric pressure output from the reference atmospheric pressure sensor 31 to the estimation unit 54 via the parent unit side transmitting unit 53 possessed by the parent unit 5.

[0031] The reference unit side microcomputer 34 is a part that controls the reference unit side receiver 32 and the reference unit side transmitter 33. The battery 35 is for supplying the necessary power to the reference atmospheric pressure sensor 31, the reference unit side receiver 32, the reference unit side transmitter 33, and the reference unit side microcomputer 34, and may be either a primary battery or a secondary battery.

[0032] The parent unit 5 has an operator side atmospheric pressure sensor 51, a parent unit side receiving unit 52, a parent unit side transmitting unit 53, an estimation unit 54, a notification unit 55, a control unit 56, a battery 57, and a housing 58 that houses these. The estimation unit 54 and the control unit 56 are parts that are configured by operating a microcomputer built into the parent unit 5 according to a predetermined program, and may be configured as hardware or a combination of software and hardware.

[0033] The worker-side atmospheric pressure sensor 51 is a sensor worn by the worker A for detecting the atmospheric pressure around the worker A, and is configured by a conventionally known atmospheric pressure sensor. In this embodiment, an example in which the worker-side atmospheric pressure sensor 51 is housed in the housing 58 of the parent unit 5 will be described, but the worker-side atmospheric pressure sensor 51 may be provided in, for example, the first hook side device 2A or the second hook side device 2B, or may be provided independently.

[0034] When the worker-side atmospheric pressure sensor 51 is provided on the first hook-side device 2A or the second hook-side device 2B, the hooks 205, 207 and worker A are not so far apart in the vertical direction, and the hooks 205, 207 are generally placed at approximately the same height as worker A, so the atmospheric pressure detected by the worker-side atmospheric pressure sensor 51 is equal to the atmospheric pressure at the height where worker A is located. Even when the worker-side atmospheric pressure sensor 51 is attached to the helmet or waist belt 201 of worker A, the worker-side atmospheric pressure sensor 51 can detect the atmospheric pressure at the height where worker A is located. The worker-side atmospheric pressure sensor 51 outputs a detection value of the atmospheric pressure at a short period of, for example, several tens of msec.

[0035] The parent device side receiving unit 52 is configured with a communication module and the like for receiving the detection value of the atmospheric pressure transmitted from the reference device side transmitting unit 33 of the reference device 3. The detection value of the atmospheric pressure received by the parent device side receiving unit 52 is input to the estimation unit 54. The form of communication between the parent device 5 and the reference device 3 is not particularly limited, but can be, for example, the above-mentioned LPWA short-distance wireless communication. In addition, the parent device side receiving unit 52 is configured to receive the detection result of the first hook state detection sensor 20A transmitted from the first hook side transmitting unit 21A and the detection result of the second hook state detection sensor 20B transmitted from the second hook side transmitting unit 21B.

[0036] The master side transmitter 53 is composed of a communication module for transmitting various signals to the master 3, and the communication format can be, for example, the above-mentioned LPWA short-distance wireless communication.

[0037] The estimation unit 54 acquires the detected atmospheric pressure value output from the worker's side atmospheric pressure sensor 51 of the parent unit 5 and the detected atmospheric pressure value output from the reference atmospheric pressure sensor 31 of the reference unit 3, and estimates whether or not a worker is on top of the tower 100 based on the detected atmospheric pressure value output from the worker's side atmospheric pressure sensor 51 and the detected atmospheric pressure value output from the reference atmospheric pressure sensor 31.

[0038] The notification unit 55 is a part for notifying the worker A that the tower work by the worker A is in an unsafe state. Examples of the notification unit 55 include a vibration generator, a speaker, a transmission device equipped with an actuator for hitting a helmet, a display unit, and the like. When the high-altitude work by the worker A is in an unsafe state, the notification is made to the worker A by the vibration generator, the speaker, and the transmission device. For example, when the high-altitude work is in an unsafe state, the vibration generator can generate vibration to notify the worker A, a sound indicating the unsafe state can be emitted from the speaker, or the transmission device can be used to notify the worker A by hitting the helmet. Examples of notification by the speaker include a voice message such as "The hook is not attached during tower work" from the speaker, or various warning sounds (alarm sounds) can be generated. Further, examples of notifications by the display unit include displaying text such as "Hook not attached during tower work" on the display unit, or displaying a symbol or mark indicating an unsafe condition.

[0039] When the estimation unit 54 estimates that the worker A is on the tower 100 and the detection results of the hook state detection sensors 20A and 20B determine that both the hooks 205 and 207 are not in a state of being hooked on the fall prevention member 111, the control unit 56 controls the notification unit 55 to notify that the state is unsafe. When determining whether the hooks 205 and 207 are in a state of being hooked on the fall prevention member 111, the control unit 56 is configured to determine whether the hooks 205 and 207 are in a state of being hooked on the fall prevention member 111 based on the detection results of the hook state detection sensors 20A and 20B received by the parent device side receiving unit 52. The battery 57 is for supplying necessary power to the worker side atmospheric pressure sensor 51, the parent device side receiving unit 52, the parent device side transmitting unit 53, the estimation unit 54, the notification unit 55, and the control unit 56, and may be either a primary battery or a secondary battery.

[0040] The master unit 5 and the reference unit 3 may be configured as the same device. That is, devices with common hardware are prepared, and both the program for the master unit 5 and the program for the reference unit 3 are stored in these devices. A selection switch is provided in the device, and the selection switch allows the user to select whether to execute the program for the master unit 5 or the program for the reference unit 3. By executing the program for the master unit 5, the device operates as the master unit 5, and by executing the program for the reference unit 3, the device operates as the reference unit 3.

[0041] An example of the operation of the tower work safety management system 1 will be described below with reference to the flowchart shown in Fig. 5. This flowchart starts after the first hook side device 2A, the second hook side device 2B, the parent device 5, and the reference device 3 are powered on and undergo a mutual recognition process (pairing process). In addition, the worker side atmospheric pressure sensor 51 of the parent device 5 worn by the worker A and the reference atmospheric pressure sensor 31 of the reference device 3 are calibrated before use.

[0042] In step SA1, the parent unit 5 receives the detection value of the reference atmospheric pressure detected by the reference atmospheric pressure sensor 31 of the reference unit 3. The period during which the reference unit side transmitter 33 transmits the detection value of the reference atmospheric pressure can be set in the range of 30 to 90 seconds, for example, and is set to 60 seconds in this embodiment. Considering the safety of the worker A, it is preferable that the transmission period of the atmospheric pressure is short, but considering the consumption of the battery 35, it is preferable to set it in the above range. Note that the detection value of the reference atmospheric pressure may be transmitted in a period shorter than the above range.

[0043] In step SA2, the estimation unit 54 acquires the detection value of the worker-side atmospheric pressure sensor 51. The detection value of the worker-side atmospheric pressure sensor 51 is set as C. In step SA3, the estimation unit 54 acquires the detection value of the reference atmospheric pressure acquired in step SA1, and executes a process of subtracting a predetermined threshold value from the detection value of the reference atmospheric pressure to obtain a value (D). The threshold value is a value for determining whether or not the worker A is at a high place, i.e., on the tower 100, and can be, for example, a value corresponding to an atmospheric pressure several meters to tens of meters above the ground. In step SA3, the value obtained by subtracting the predetermined threshold value from the detection value of the reference atmospheric pressure is set as D. The threshold value can be stored in advance in a memory unit (not shown) of the parent unit 5.

[0044] In step SA4, the estimation unit 54 compares the detection value (C) of the worker-side atmospheric pressure sensor 51 acquired in step SA2 with the value (D) calculated in step SA3, and judges whether the detection value (C) is smaller than the value (D). If the judgment in step SA4 is NO and the detection value (C) is equal to or larger than the value (D), the estimation unit 54 estimates that the worker A is not on the tower 100, i.e., is at a low position such as on the ground, and proceeds to step SA1.

[0045] On the other hand, if the result of the determination in step SA4 is YES and the detection value (C) is smaller than the value (D), the estimation unit 54 estimates that the worker A is on the tower 100, and the process proceeds to step SA5. In step SA5, the control unit 56 acquires the detection result of the first hook state detection sensor 20A and the detection result of the second hook state detection sensor 20B. The period in which the first hook side device 2A and the second hook side device 2B transmit the detection results of the first hook state detection sensor 20A and the second hook state detection sensor 20B can be set in the range of, for example, 5 to 30 seconds, and is set to 15 seconds in this embodiment. However, if the state of either the first hook state detection sensor 20A or the second state detection sensor 20B changes, the detection result is transmitted regardless of the period. In this way, the period in which the detection results of the first hook state detection sensor 20A and the second hook state detection sensor 20B are transmitted is set shorter than the period in which the reference atmospheric pressure is transmitted.

[0046] When the control unit 56 judges that the first hook 205 is in a state of being hung on the fall prevention member 111 based on the detection result of the first hook state detection sensor 20A, the judgment result of step SA5 is YES. Also, when the control unit 56 judges that the second hook 207 is in a state of being hung on the fall prevention member 111 based on the detection result of the second hook state detection sensor 20B, the judgment result of step SA5 is YES. Also, when the first hook 205 is in a state of being hung on the fall prevention member 111 but the second hook 207 is not hung on the fall prevention member 111, the judgment result of step SA5 is YES. Furthermore, when the second hook 207 is in a state of being hung on the fall prevention member 111 but the first hook 205 is not hung on the fall prevention member 111, the judgment result of step SA5 is YES. In the case of YES, since the tower work by the worker A is in a safe state, no notification is given and the like is not given, and the process proceeds to step SA1.

[0047] On the other hand, if the first hook 205 is not hooked on the fall prevention member 111 and the second hook 207 is not hooked on the fall prevention member 111, the judgment result of step SA5 is NO. If both the first hook 205 and the second hook 207 are not hooked on the fall prevention member 111, it is presumed that the worker A is in an unsafe state even though he is on the tower 100. In this case, the process proceeds to step SA6, and the control unit 56 controls the notification unit 55 to notify that the unsafe state exists.

[0048] That is, when it is determined that the hooks 205, 207 are in a state of being hooked on the fall prevention member 111 based on either the detection result of the first hook state detection sensor 20A or the detection result of the second hook state detection sensor 20B, the control unit 56 controls the notification unit 55 so as not to notify that the unsafe state exists. That is, when the worker A moves on the steel tower 100, the second hook 207 may be removed from the fall prevention member 111 while the first hook 205 is hooked on the fall prevention member 111. In such a case, since safety is guaranteed by the first hook 205, it is not an unsafe state. On the other hand, when the worker A moves with the first hook 205 removed from the fall prevention member 111 while the second hook 207 is hooked on the fall prevention member 111, it is not an unsafe state. In such a case, it is possible not to notify that the unsafe state exists.

[0049] Although not essential, the master unit side transmitter 53 of the master unit 5 can also transmit an alarm signal to notify that the tower work by the worker A is in an unsafe state. For example, when proceeding to step SA6, the control unit 56 generates an alarm signal indicating that the tower work by the worker A is in an unsafe state. The generated alarm signal is transmitted from the master unit side transmitter 53 and received by the reference unit side receiver 32 of the reference unit 3. The reference unit 3 can be provided with an alarm unit (not shown) similar to the master unit 5, and the reference unit 3 is configured to notify the alarm unit of an unsafe state based on the alarm signal received by the reference unit side receiver 32. This allows the manager B to know if the worker A is in an unsafe state even if the manager B cannot visually see the worker A working on the tower 100.

[0050] The control unit 56 constantly receives the detection results of the first hook state detection sensor 20A and the second hook state detection sensor 20B. After proceeding to step SA6, if it is determined as YES in step SA5 of the next flow, it means that the unsafe state has been resolved, and the control unit 56 controls the notification unit 55 not to notify the unsafe state thereafter. Also, if it is determined as NO in step SA4 of the next flow after proceeding to step SA6, it is considered that the worker A has descended from the tower 100, and the control unit 56 controls the notification unit 55 not to notify the unsafe state thereafter.

[0051] (Effects of the embodiment) As described above, according to the tower work safety management system 1 of this embodiment, it is possible to accurately estimate whether or not worker A is on top of the tower 100 by comparing the detection value of atmospheric pressure output from the worker-side atmospheric pressure sensor 51 possessed by the parent unit 5 with the detection value of atmospheric pressure output from the reference atmospheric pressure sensor 31 attached to the manager B on the ground.

[0052] When worker A is on top of the tower 100, if the hook state detection sensors 20A, 20B detect that both hooks 205, 207 of the safety belt 200 are not attached to the fall prevention member 111, it can be said that the tower work by worker A is in an unsafe state. In this case, the control unit 56 can cause the notification unit 55 to notify that the tower work by worker A is in an unsafe state. This allows the worker A to be warned to correct the unsafe state. In addition, by notifying the manager B that the tower work by worker A is in an unsafe state, the manager B can also manage the safety of worker A.

[0053] The above-mentioned embodiment is merely illustrative in every respect and should not be interpreted as being restrictive. Furthermore, all modifications and changes within the scope of the claims are within the scope of the present invention. In addition, the scope of application of the present invention is not limited to tower work, but can also be applied to work on aerial work vehicles and on utility poles. [Industrial Applicability]

[0054] As described above, the height work safety management system according to the present invention can be used to ensure safety during work on steel towers, for example. [Explanation of symbols]

[0055] 1. Tower Work Safety Management System 3 Reference machine 5 Parent unit 20A First Hook Status Detection Sensor 20B Second hook state detection sensor 31 Reference atmospheric pressure sensor 32 Reference unit receiver 33 Transmitter on the reference unit 51 Operator side atmospheric pressure sensor 52 Parent unit receiving section 53 Parent unit transmitter 54 Estimation part 55 Notification Department 56 Control section 100 Steel Tower 111 Fall prevention parts 200 Safety Belt 205 First Hook 207 Second 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 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 reference atmospheric pressure sensor that is configured separately from the worker-side atmospheric pressure sensor and is worn by a ground manager to detect atmospheric pressure at a reference height that serves as a reference for determining whether or not the worker is at a high altitude; an estimation unit that estimates whether or not the worker is at a high altitude based on 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; a notification unit that notifies a worker that a high-altitude work is in an unsafe state; A height-work safety management system characterized by comprising a control unit that controls the notification unit to notify of an unsafe state when the estimation unit estimates that the worker is at a high altitude and the detection result of the hook state detection sensor determines that the hook is not attached to the fall prevention member.

2. In the height-work safety management system according to claim 1, a master unit having the worker-side atmospheric pressure sensor, the estimation unit, the notification unit, and the control unit, and worn by the worker; a reference device having the reference atmospheric pressure sensor and attached to an administrator, the reference device has a reference device side transmitting unit that transmits a detection value of atmospheric pressure output from the reference atmospheric pressure sensor to the estimating unit, the master unit has a master unit receiving unit that receives the detected value of the atmospheric pressure transmitted from the reference unit transmitting unit, A high-altitude work safety management system characterized in that the estimation unit estimates whether or not a worker is at a high altitude based on the detection value of the atmospheric pressure received by the parent unit receiving unit and the detection value of the atmospheric pressure output from the worker's side atmospheric pressure sensor.

3. In the height-work safety management system according to claim 2, the hook has a hook-side transmitting unit that transmits a detection result of the hook state detection sensor to the estimation unit, the master side receiving unit is configured to receive the detection result transmitted from the hook side transmitting unit, A height-work safety management system characterized in that the control unit is configured to determine whether or not the hook is attached to the fall prevention member based on the detection result received by the parent unit receiving unit.

4. In the height-work safety management system according to claim 2, The parent unit has a parent unit side transmitter that transmits an alarm signal to notify that an unsafe state exists, The reference machine has a reference machine side receiving unit that receives the warning signal transmitted from the parent machine side transmitting unit, and is configured to notify of an unsafe condition based on the warning signal received by the reference machine side receiving unit.This is a height-work safety management system.

5. In the height-work safety management system according to claim 1, The hook state detection sensor includes a first hook state detection sensor provided on a hook of a first lanyard and a second hook state detection sensor provided on a hook of a second lanyard, The control unit controls the notification unit so as not to notify of an unsafe state when either the detection result of the first hook state detection sensor or the detection result of the second hook state detection sensor determines that the hook is hooked onto the fall prevention member.This is a height-work safety management system characterized by the above.

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