Elevator safety work management system and safety management method

Abstract

To provide an elevator safety work management system and safety management method that can accurately detect a distance and an orientation of a worker while working.SOLUTION: A safety work management system 50 comprises an orientation / distance measurement tag 20, a worker-side antenna 33, a portable terminal 30, and a distance / orientation estimation unit 34. The orientation / distance measurement tag 20 is installed in a car or a hoistway, and has a tag-side antenna 23. The worker-side antenna 33 transmits and receives radio waves with the tag-side antenna 23. The portable terminal 30 has the worker-side antenna 33 and is held by a worker. The distance / orientation estimation unit 34 estimates an orientation and a distance of the portable terminal 30 relative to the orientation / distance measurement tag 20 based on information from the worker-side antenna 33 or the tag-side antenna 23.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an elevator safety work management system and a safety management method. [Background technology]

[0002] Elevators are equipped with cars that carry people and luggage. During elevator maintenance and inspection work, workers enter the car and the pit of the elevator shaft to carry out various inspections, diagnoses, and repairs.

[0003] One example of a technology for enabling workers to perform their work safely is described in Patent Document 1. Patent Document 1 describes a technology that includes an elevator control device and multiple camera fixers connected to the elevator control device and installed inside the elevator. When the camera device is inserted, the camera fixer fixes the camera device so that it captures images of specified monitoring targets related to elevator inspection work. The camera fixer is also connected to the camera device in a state that allows communication with the camera device, acquires image information captured by the camera device, and transmits it to the elevator control device. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-222406 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the technology described in Patent Document 1 uses a camera device to detect the position and direction of the worker, which requires the installation of lighting inside the elevator shaft to illuminate the worker. Furthermore, the brightness inside the elevator shaft varies depending on the outside light and the installation location of the lighting. Therefore, the technology described in Patent Document 1 has the problem of being unable to accurately detect the distance and direction (position) of the worker while he or she is working.

[0006] In consideration of the above problems, the present invention aims to provide an elevator safety work management system and safety management method that can accurately detect the distance and direction of a worker while working. [Means for solving the problem]

[0007] To solve the above problems and achieve this objective, the elevator safety work management system comprises a direction / distance measurement tag, a worker-side antenna, a mobile terminal, and a distance / direction estimation unit. The direction / distance measurement tag is installed in the elevator car or inside the hoistway and has a tag-side antenna. The worker-side antenna transmits and receives radio waves with the tag-side antenna. The mobile terminal has a worker-side antenna and is held by the worker. The distance / direction estimation unit estimates the direction and distance of the mobile terminal relative to the direction / distance measurement tag based on information from the worker-side antenna or tag-side antenna.

[0008] The safety management method also includes the following steps (1) to (3). (1) A process of installing a direction and distance measurement tag with a tag-side antenna in the elevator car or hoistway. (2) A process in which an antenna on the worker's side, which is attached to a portable terminal held by the worker, transmits and receives radio waves to and from an antenna on the tag side. (3) A process of estimating the direction and distance of the mobile terminal relative to the direction and distance measurement tag based on information from the worker's antenna or the tag's antenna. [Effects of the Invention]

[0009] According to the elevator safety work management system and safety management method configured as described above, the distance and direction of a worker during work can be accurately detected. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic configuration diagram showing an example of an elevator to which a safety work management system according to an embodiment is applied. [Figure 2] 1 is a plan view of an elevator to which a safety work management system according to an embodiment is applied. [Figure 3] 1 is a plan view showing a safe area and a dangerous area of ​​a safety work management system according to an embodiment. FIG. [Figure 4] 1 is a block diagram showing an example of a control system of a safety work management system according to an embodiment. FIG. [Figure 5] FIG. 10 is a block diagram showing another example of a control system of the safety work management system according to the embodiment. [Figure 6] 10 is a flowchart showing an example of an operation of a maintenance and inspection work using the safety work management system according to the embodiment; DETAILED DESCRIPTION OF THE INVENTION

[0011] An elevator safety work management system and safety management method according to an embodiment will be described below with reference to Figures 1 to 6. Note that common members in each figure are given the same reference numerals.

[0012] 1. Example of implementation 1-1. Elevator configuration example First, the configuration of an elevator to which a safety work management system according to an embodiment (hereinafter referred to as "this example") is applied will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a schematic diagram showing an example of the configuration of an elevator, and FIG. 2 is a plan view of the elevator.

[0013] As shown in Fig. 1, elevator 1 is installed in a hoistway 110 formed within a building structure. Elevator 1 moves up and down within hoistway 110 and includes a car 120 for carrying passengers and cargo, ropes 130, a counterweight 140, a hoisting machine 100, and a control panel 190. A machine room 160 is provided at the top of hoistway 110.

[0014] The hoist 100 is disposed in a machine room 160, and raises and lowers the car 120 by winding the rope 130 around it. In addition, near the hoist 100, a deflector wheel 150 on which the rope 130 is mounted is provided.

[0015] The car 120 is attached to one axial end of the rope 130, and the counterweight 140 is attached to the other axial end of the rope 130. Therefore, the car 120 is connected to the counterweight 140 via the rope 130. When the hoisting machine 100 is driven, the car 120 and the counterweight 140 move up and down. The control panel 190 is installed in, for example, the machine room 160. The control panel 190 controls the driving of the hoisting machine 100.

[0016] 2, a building door 210 is arranged at a stop floor where the car 120 in the building structure stops. During inspection work, a worker W1 enters the elevator shaft 200 through the building door 210.

[0017] The elevator car 120 has a hollow car chamber 121. An on-car control box 10 is disposed on the ceiling of the car chamber 121. In general, the on-car control box 10 is disposed in a corner of the car chamber 121 on the front side facing the building door 210 of the car chamber 121.

[0018] The configuration of elevator 1 is not limited to the 1:1 roping elevator shown in Figure 1, but can also be applied to various other elevators, such as 2:1 roping elevators and machine room-less elevators that do not have a machine room at the top of the elevator shaft.

[0019] 1-2. Example of a safety work management system configuration Next, the configuration of the safety work management system 50 of this embodiment will be described with reference to FIGS. Fig. 3 is a plan view showing the safe area and the dangerous area of ​​the safe work management system 50. Fig. 4 is a block diagram showing an example of a control system of the safe work management system 50.

[0020] 2 to 4, the safety work management system 50 includes a direction / distance measurement tag 20 and a smart device 30, which is an example of a portable terminal carried by a worker W1. The safety work management system 50 is a so-called ultra-wideband wireless system that uses radio waves to measure the direction (position) and distance between the direction / distance measurement tag 20 and the smart device 30 carried by the worker W1.

[0021] 2 and 3, the direction / distance measurement tags 20 are installed at the four corners of the upper part of the car room 121 of the passenger car 120. In this example, the direction / distance measurement tags 20 are installed in the on-car control box 10 arranged on the ceiling of the car room 121.

[0022] 4, the direction / distance measurement tag 20 has an antenna control unit 21, a tag-side antenna 23 that transmits and receives radio waves, and a control unit 22. The control unit 22 controls the antenna control unit 21. The antenna control unit 21 controls the tag-side antenna 23. The tag-side antenna 23 is connected to an operator-side antenna 33 provided in the smart device 30 so as to be able to transmit and receive signals.

[0023] The detectable area of ​​this direction / distance measurement tag 20 has a detectable area of ​​90° or more in the horizontal direction. Therefore, by installing one direction / distance measurement tag 20 at any one of the four corners of the car 120, the entire horizontal area within the hoistway 200 can be set as the detectable area. This eliminates the need to prepare multiple direction / distance measurement tags 20, which not only reduces the number of parts but also simplifies the installation work of the direction / distance measurement tags 20.

[0024] The number of direction / distance measurement tags 20 is not limited to one, and multiple direction / distance measurement tags 20 may be installed in the elevator 120. This can improve the accuracy of detecting the direction and distance of the worker W1 carrying the smart device 30.

[0025] The smart device 30 has an antenna control unit 31, a control unit 32, a worker-side antenna 33 that transmits and receives radio waves, a distance / direction estimation unit 34, a data storage unit 35, a determination unit 36, an alarm unit 37, and a wireless communication unit 38. The antenna control unit 31 controls the worker-side antenna 33 and acquires information from the direction / distance measurement tag 20. The information acquired by the antenna control unit 31 is then output to the distance / direction estimation unit 34 and the control unit 32.

[0026] The distance / direction estimation unit 34 estimates the direction and distance of the smart device 30 relative to the direction / distance measurement tag 20 based on information from the antenna control unit 31. Then, the result estimated by the distance / direction estimation unit 34 (estimation result) is output to the determination unit 36 ​​and the control unit 32.

[0027] The determination unit 36 ​​determines whether the worker W1 is in the dangerous area P1 or the safe area P2 based on the estimation result output from the distance / direction estimation unit 34. The determination unit 36 ​​outputs the determination result to the control unit 32.

[0028] 3, the safety area P2 is set at the center of the ceiling of the car room 121. The danger area P1 is the area from the outer periphery of the safety area P2 to the wall surfaces 201 and 202 of the elevator shaft 200.

[0029] The setting work of the danger area P1 and the safety area P2 is performed before the worker W1 starts the maintenance and inspection work, and the data is stored in the data storage unit 35. As a method of defining the danger area P1 and the safety area P2, for example, the worker W1 may directly input the dimensions into the smart device 30. Alternatively, the danger area P1 and the safety area P2 may be defined by the worker W1, or by the control unit 32 or the determination unit 36 ​​from drawings, photographs, 3D maps, etc. of the car 120 and the elevator shaft 200.

[0030] Furthermore, the worker W1 inputs the serial number ID of the elevator 1 into the smart device 30. The control unit 32 may acquire the dimensions of the car 120 and the elevator shaft 200 based on the input serial number ID, and define a danger area P1 and a safety area P2 from the acquired dimensions of the car 120 and the elevator shaft 200. The control unit 32 may also acquire a history of the movement lines from the previous work from the data storage unit 35, an external sales office, or the remote monitoring center 40. The control unit 32 may then define a danger area P1 and a safety area P2 based on the history of the movement lines from the previous work.

[0031] Alternatively, the danger area P1 and the safety area P2 may be defined by the following method. As shown in FIG. 2, when a worker W1 installs the direction / distance measurement tag 20 on the elevator car 120 and turns on the safety start switch, the worker W1 is generally standing at the center of the building door 210. The distance / direction estimation unit 34 of the smart device 30 measures the distance T1 between the direction / distance measurement tag 20 and the smart device 30 at the start of work when the worker W1 installs the direction / distance measurement tag 20. The control unit 32 then defines the work area as a distance twice the measured distance T1. This makes it possible to define the danger area P1 and the safety area P2 without inputting information into the smart device 30.

[0032] The smart device 30 also has various sensors, such as an acceleration sensor, an angular velocity sensor, and an altitude sensor (not shown). The control unit 32 estimates the posture and movement of the worker W1 based on information from the various sensors. Then, based on the estimated posture and movement of the worker W1, the control unit 32 determines whether the worker W1 is performing unsafe behavior (unsafe behavior), such as not moving his head and not checking the safety of his surroundings, or stretching his arms out.

[0033] The alarm unit 37 issues an alarm to the worker W1 under the control of the control unit 32. For example, when the control unit 32 determines that the worker W1 is performing an unsafe behavior and is in the danger area P1, the control unit 32 controls the alarm unit 37 to issue an alarm to the worker W1.

[0034] The wireless communication unit 38 is connected via a network to an external sales office and a remote monitoring center 40. The wireless communication unit 38 transmits work results to the external sales office and the remote monitoring center 40, and receives information about the work from the external sales office and the remote monitoring center 40.

[0035] 1-3.Other examples of safety work management systems Next, another example of the safe work management system will be described with reference to FIG. Fig. 5 is a block diagram showing another example of a control system for a safe work management system. Note that parts common to the safe work management system 50 shown in Fig. 4 are given the same reference numerals and redundant explanations will be omitted.

[0036] 5, the direction / distance measurement tag 20A has a distance / direction estimation unit 24. The distance / direction estimation unit 24 estimates the direction and distance of the smart device 30A relative to the direction / distance measurement tag 20A based on information from the antenna control unit 31. The direction / distance measurement tag 20A also has a wireless communication unit 25 that transmits and receives information to and from a wireless communication unit 38 provided in the smart device 30A.

[0037] The wireless communication unit 25 transmits the results of the estimation by the distance / direction estimation unit 24 to the wireless communication unit 38 of the smart device 30A. Then, the determination unit 36 ​​of the smart device 30A determines whether the worker W1 is in the danger area P1 or the safety area P2 based on the distance / direction estimation results received by the wireless communication unit 38.

[0038] The other configurations are the same as those of the safety work management system 50 shown in FIG. 4 described above, and therefore the description thereof will be omitted.

[0039] 2. Examples of maintenance and inspection operations Next, an example of the operation of maintenance and inspection work using the above-described safety work management system 50 will be described with reference to FIG. FIG. 6 is a flowchart showing an example of the operation of the maintenance and inspection work.

[0040] As shown in Fig. 6, the worker W1 moves the car 120 to a predetermined position and opens the building door 210 (step S11). Next, the worker W1 installs the direction / distance measurement tag 20 on the top of the car 120 (step S12). In this example, an example will be described in which the direction / distance measurement tag 20 is installed in the on-car control box 10 provided in the car room 121, as shown in Fig. 2.

[0041] Next, the worker W1 turns on the switch of the direction / distance measurement tag 20 through the building door 210 and operates the smart device 30 to execute monitoring processing (monitoring software) by the safety work management system 50 (step S13). When the processing of step S13 is executed, the distance / direction estimation unit 34 estimates (measures) the direction and distance of the smart device 30 relative to the direction / distance measurement tag 20. Then, the determination unit 36 ​​determines whether the initial position and direction of the worker are normal or not based on the estimation result of the distance / direction estimation unit 34 (step S14).

[0042] Here, the two horizontal directions of the detection area of ​​the direction / distance measurement tag 20 are defined as a first direction X and a second direction Y. The first direction X is a direction parallel to the opening and closing direction of the building door 210. The second direction Y is a direction perpendicular to the first perpendicular direction X, and is a direction facing the building door 210 in the elevator shaft 200.

[0043] 2, when the direction / distance measurement tag 20 is installed at the left corner of the car 120, the coordinate on the right side in the first direction X is positive and the coordinate on the left side is negative, with the direction / distance measurement tag 20 as the origin. Note that when the direction / distance measurement tag 20 is installed at the right corner of the car 120, the coordinate on the left side in the first direction X is positive and the coordinate on the right side is negative.

[0044] Moreover, the direction / distance measurement tag 20 is installed at a corner on the front side of the building-side door 210 of the car 120. Therefore, a coordinate in the second direction Y approaching the wall surface 202 on the rear side of the elevator shaft 200 is a positive coordinate, and a coordinate in the direction moving away from the wall surface 202 is a negative coordinate. Note that when the direction / distance measurement tag 20 is installed at a corner on the front side of the rear side of the car 120, a coordinate in the second direction Y approaching the wall surface 202 on the rear side of the elevator shaft 200 is a negative coordinate, and a coordinate in the direction moving away from the wall surface 202 is a positive coordinate.

[0045] However, it is preferable that the direction / distance measurement tag 20 be installed at a corner on the front side of the car 120. This allows the worker W1 to install the direction / distance measurement tag 20 by stretching his / her arm from the building-side door 210 without getting into the car 120. As a result, the direction / distance measurement tag 20 can be installed safely.

[0046] In this case, if the initial position and orientation of the worker are normal, i.e., if the orientation / distance measurement tag 20 is installed in the correct position, the coordinates of the smart device 30 relative to the orientation / distance measurement tag 20 will be positive in the first direction X and negative in the second direction Y. In contrast, for example, if the coordinate of the smart device 30 relative to the orientation / distance measurement tag 20 in the first direction X is negative or the coordinate of the smart device 30 in the second direction Y is positive, it can be determined that the orientation / distance measurement tag 20 is installed incorrectly. This makes it possible to automatically determine the installation position of the orientation / distance measurement tag 20.

[0047] The direction / distance measurement tag 20 may be provided with an installation guide that indicates the orientation of the installation position. The installation guide has a guide that indicates the orientation of the first direction X described above and a guide that indicates the orientation of the second direction Y. Then, the worker W1 installs the direction / distance measurement tag 20 along the installation guide provided on the direction / distance measurement tag 20.

[0048] In the process of step S14, if the determination unit 36 ​​determines that the initial position and orientation of the worker are abnormal (NO determination in step S14), the control unit 32 instructs the worker W1 to install the orientation / distance measurement tag 20 in the correct installation position (step S15). Then, the worker W1 returns to the process of step S12 and reinstalls the orientation / distance measurement tag 20.

[0049] On the other hand, if the determination unit 36 ​​determines in the process of step S14 that the initial position and orientation of the worker are normal (YES determination in step S14), the control unit 32 executes the monitoring process (monitoring software) (step S16). The setting work of the danger area P1 and the safety area P2 is performed before the process of step S16. Then, the set danger area P1 and safety area P2 are stored in the data storage unit 35.

[0050] Next, the worker W1 gets on the car 120 and starts the maintenance and inspection work (step S17). That is, after the direction / distance measurement tag 20 is installed in the correct position, the worker W1 gets on the car 120. This allows the distance / direction estimation unit 34, which will be described later, to accurately detect the direction and distance of the worker W1.

[0051] Next, based on the information from the tag-side antenna 23 and the worker-side antenna 33 that transmit and receive radio waves, the distance / orientation estimation unit 34 estimates (measures) the orientation and distance of the smart device 30 relative to the orientation / distance measurement tag 20 (step S18).

[0052] As described above, the direction and distance of the smart device 30 relative to the direction / distance measurement tag 20 are estimated (measured) wirelessly using the tag-side antenna 23 and the worker-side antenna 33, which transmit and receive radio waves. This allows the direction and distance of the worker W1 to be detected accurately. Furthermore, because it is wireless and uses radio waves, the direction and distance of the worker W1 can be detected without being affected by the brightness inside the elevator shaft 200.

[0053] Then, the control unit 32 determines whether the car 120 of the elevator 1 is moving (step S19). The determination of whether the car 120 is moving is made based on information from the control panel 190, information from an acceleration sensor and an altitude sensor provided in the smart device 30, and the like.

[0054] In the process of step S19, if the control unit 32 determines that the car 120 is not moving (NO determination in step S19), the process proceeds to the process of step S23 described below. Also, in the process of step S19, if the control unit 32 determines that the car 120 is moving (YES determination in step S19), it determines whether the worker W1 is performing an unsafe behavior (step S20).

[0055] In the processing of step S20, the control unit 32 estimates the posture and movement of the worker W1 based on information from various sensors provided in the smart device 30. Then, the control unit 32 determines whether the worker W1 is engaging in unsafe behavior based on the estimated posture, movement, etc. of the worker W1.

[0056] If the control unit 32 determines in step S20 that the worker W1 is not engaging in unsafe behavior (NO in step S20), the process proceeds to step S23, which will be described later. If the control unit 32 determines in step S20 that the worker W1 is engaging in unsafe behavior (YES in step S20), the process proceeds to step S21.

[0057] In the process of step S21, the determination unit 36 ​​determines whether the position of the worker W1 is in the dangerous area P1 based on the distance and direction of the worker W1 measured in step S18. That is, the determination unit 36 ​​determines whether the position of the smart device 30 relative to the direction and distance measurement tag 20 is in the dangerous area P1. In the process of step S21, if the determination unit 36 ​​determines that the position of the worker W1 is not in the dangerous area P1 (NO determination in step S21), the process proceeds to the process of step S23 described below.

[0058] On the other hand, if the determination unit 36 ​​determines in the processing of step S21 that the position of the worker W1 is in the danger area P1 (YES determination in step S21), the control unit 32 controls the alarm unit 37 to issue an alarm (step S22). This prevents the worker W1 from coming into contact with the rope 130, the counterweight 140, or protrusions on the walls 201 and 202 of the elevator shaft 200, or from falling from the car 120 while working. As a result, work safety can be improved.

[0059] The timing for issuing an alarm is based on three conditions: whether the car 120 is moving, whether the worker W1 is behaving unsafely, and whether the worker W1 has entered the dangerous area P1, but this is not limitative. For example, an alarm may be issued when the worker W1 approaches or enters the dangerous area P1, regardless of whether the car 120 is moving or whether the worker W1 is behaving unsafely.

[0060] Furthermore, when proceeding to the processing of step S23, the control unit 32 determines whether or not the maintenance and inspection work has been completed on the upper part of the car 120. If the control unit 32 determines in the processing of step S23 that the maintenance and inspection work has not been completed (NO determination in step S23), the processing returns to the processing of step S18.

[0061] On the other hand, if the control unit 32 determines in the processing of step S23 that the maintenance and inspection work has been completed (YES determination in step S23), the control unit 32 terminates the monitoring software (step S24). Next, the worker W1 removes the direction / distance measurement tag 20 from above the car 120 (step S25). Through these steps, the maintenance and inspection work using the safety work management system 50 is completed.

[0062] The present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the spirit of the invention as set forth in the claims.

[0063] Furthermore, in the above-described embodiment, an example has been described in which the safety work management system 50 of this example is used during maintenance and inspection work on the car 120, but the present invention is not limited to this. For example, the safety work management system 50 of this example may be used when a worker W1 works in a pit, which is the lower part of the elevator shaft 200. In this case, the direction / distance measuring tag 20 is installed in at least one of the four corners of the pit. This makes it possible to issue an alarm to the worker W1 when the worker W1 enters a dangerous area P1, such as below a counterweight or near various pulleys.

[0064] Furthermore, some or all of the above-described components, functions, processing units, etc. may be implemented in hardware, for example, by designing an integrated circuit. Furthermore, the above-described components, functions, etc. may be implemented in software by a processor interpreting and executing a program that implements each function. Information such as the programs, tables, and files that implement each function can be stored in a storage device such as a memory, a hard disk, or an SSD (Solid State Drive), or in a storage medium such as an IC card, SD card, or DVD.

[0065] In this specification, the words "parallel" and "orthogonal" are used, but these do not mean only "parallel" and "orthogonal" in the strict sense, but also include "parallel" and "orthogonal" and may also mean a "substantially parallel" or "substantially orthogonal" state within a range in which the functions can be exerted. [Explanation of symbols]

[0066] 1...Elevator, 10...Cage-mounted control box, 20, 20A...Direction and distance measurement tag, 21...Antenna control unit, 22...Control unit, 23...Tag side antenna, 24, 34...Distance and direction estimation unit, 25...Wireless communication unit, 30, 30A...Smart device (mobile terminal), 30A...Smart device, 31...Antenna control unit, 32...Control unit, 33...Worker side antenna, 35...Data storage unit, 36...Determination unit, 37...Alarm unit, 38...Wireless communication unit, 40...Remote monitoring center, 50, 50A...Safety work management system, 100...Hoist, 110...Hoistway, 120...Cage, 121...Cage room, 130...Rope, 140...Balance weight, 160...Machine room, 190...Control panel, 200...Hoistway, 201, 202...walls, 210...building door, P1...danger area, P2...safe area, W1...worker

Claims

1. an azimuth / distance measurement tag installed in an elevator car or elevator shaft and having a tag-side antenna; an antenna on a worker side that transmits and receives radio waves from the tag antenna; a mobile terminal having the worker-side antenna and held by the worker; a distance and direction estimation unit that estimates the direction and distance of the mobile terminal relative to the direction and distance measurement tag based on information from the worker-side antenna or the tag-side antenna; Elevator safety work management system equipped with

2. a data storage unit in which dangerous areas in the elevator car or elevator shaft are stored; a determination unit that determines whether the mobile terminal is in the dangerous area based on the direction and distance of the mobile terminal relative to the direction and distance measurement tag estimated by the distance and direction estimation unit; Further equipped The elevator safety work management system according to claim 1.

3. The device further includes an alarm unit that issues an alarm when the determination unit determines that the mobile terminal is in the dangerous area. The elevator safety work management system according to claim 2.

4. The mobile terminal further includes a control unit that estimates a posture and a movement of the worker based on a sensor included in the mobile terminal, The control unit controls the alarm unit based on the posture and movement of the worker and the determination of the determination unit. The elevator safety work management system according to claim 3.

5. The determination unit determines the installation position of the direction / distance measurement tag based on the direction and distance of the mobile terminal relative to the direction / distance measurement tag estimated by the distance / direction estimation unit. The elevator safety work management system according to claim 2.

6. a step of installing a direction / distance measuring tag having a tag-side antenna in an elevator car or hoistway; a step of transmitting and receiving radio waves from the tag-side antenna using a worker-side antenna provided on a portable terminal held by the worker; a step of estimating the direction and distance of the mobile terminal relative to the direction and distance measurement tag based on information from the worker-side antenna or the tag-side antenna; Safety management methods, including:

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