System and method for preventing worker falls in high-altitude work areas.

Abstract

This invention provides a fall prevention system and method that solves the problems of conventional technology and reliably prevents falls among workers working in high-altitude work areas. [Solution] This system prohibits workers from using the hook portion of a lanyard they carry while working in a high-altitude work area of ​​their own volition, and prevents workers from operating the hook portion without permission from the site manager or supervisor.

Description

Technical Field

[0001] The present invention relates to a worker fall prevention system and a worker fall prevention method in a high work area.

Background Art

[0002] When working at heights such as construction sites, workers are obliged to wear fall or drop prevention devices based on legal regulations. Generally, the fall or drop prevention device is composed of at least one belt selected from a set of shoulder belts, chest belts, body belts, pelvic belts, leg belts, etc. worn on the worker's body, and a harness member. On a part of the harness member, preferably via an appropriate shock absorber or the like, a hook main body part that engages with a hook engaging member such as an appropriate handrail or main rope at one end of an elongated body having an appropriate length is arranged, and the other end of the lanyard part is connected. Structures configured in this way are extremely commonly used. For the conventionally known fall prevention device, each worker working in a high work area wears the harness part and then manually opens the hook release means of the hook main body part provided at the tip of the lanyard part using their own hands, and engages and locks with a hook engaging member composed of a rope, main rope, handrail, etc. having an appropriate configuration stretched at an appropriate location near the work area inside the inner space of the hook main body part formed in a curved shape. After that, the hook release means is manually closed, and after the engagement between the hook engaging member and the hook main body is completed, the worker is permitted to perform the desired work.

[0003] Here, in order to surely prevent accidents where the worker falls from the high work site, it is essential that each worker accurately and surely understands the content of each construction work standard and correctly and surely uses a predetermined fall prevention device. However, even now, accidents involving workers falling from high-altitude work areas still occur frequently. It is believed that the main reasons for this are that, in many cases, the workers either intentionally omit the established work rules and procedures based on their own judgment, or they forget the necessary procedures at some point, resulting in the prescribed work being carried out in a state where safety conditions are not ensured. Furthermore, considering the lack of awareness among the workers themselves, as well as the increasing size, height, and complexity of work sites, it is impossible for a small number of supervisors to visually check the work status and compliance of each individual worker and provide timely and appropriate instructions to each worker. This situation likely supports the fact that the number of fall accidents mentioned above is not decreasing.

[0004] In other words, a major problem seems to be a lack of mutual communication. To address the problems in the conventional technologies described above, many improved technologies have been proposed to date. For example, Japanese Patent Publication No. 2011-104339 (Patent Document 1) discloses a safety harness and a system for confirming its usage status, which is equipped with a pressure sensor on the hook body to detect the pressure on the lanyard portion. Japanese Patent Publication No. 2013-500112 (Patent Document 2) discloses a lanyard and a personal emergency transmitter system that measures the tension applied to the lanyard portion worn around the worker's neck and transmits the result to an external party via a wireless transmission means.

[0005] Furthermore, Japanese Patent Publication No. 2019-512123 (Patent Document 3) discloses a personal lanyard monitoring system and position confirmation method that measures the strain on the lanyard worn around the worker's neck, transmits the results to an external party via wireless transmission, and allows the manager to determine the worker's physical position (for example, whether they have fallen or are hanging downwards). Also, Japanese Patent Application Publication No. 2022-90722 (Patent Document 4) discloses a retractable bellows-type lanyard with two lanyard sections. On the other hand, Japanese Patent Publication No. 2022-540431 (Patent Document 5) discloses a fall prevention device having multimodal induction sensing, which is configured to detect whether or not the hook portion is engaged with the main rope or an appropriate handrail portion in a double lanyard, by mounting appropriate sensor means on the hook portion of each lanyard, and to transmit the result to the outside. Furthermore, Japanese Patent Application Publication No. 2024-011230 (Patent Document 6) and Japanese Patent Application Publication No. 2024-011225 (Patent Document 7) disclose a lanyard and a lanyard light-emitting device, which are configured to have a light-emitting means on the lanyard portion or hook body portion, and to be activated by the worker when the hook body portion is engaged with a handrail or the like.

[0006] In addition, Japanese Patent Publication No. 2014-140556 (Patent Document 8) discloses a fall prevention device for working at height and a method for constructing the same, which exemplifies a contact prevention device in which one end of two rods is rotatably connected to the other end, the other end is individually fixed within the work area, and three ropes individually connected to the rotatable part and both fixed ends are joined within the internal area of ​​the two rods, and a lanyard is fixed to the joint. Furthermore, Japanese Patent Publication No. 2020-066111 (Patent Document 9) discloses a ropeless monitoring device and a high-altitude safety assurance support device configured to attach an IC chip to a hooking device to which the hook part of the lanyard is hooked, to automatically determine whether the hook part is locked to the hooking device, and to transmit that information to an external management unit. Furthermore, Japanese Patent Publication No. 7164036 (Patent Document 10) discloses a lanyard control device, method, and program for adjusting the length of a lanyard, which records the position information of a worker in video, calculates an allowable range for the length of the lanyard based on that position information so that the worker remains within the range of work possible, and instructs the lanyard's reel mechanism with that information. Japanese Patent Application Publication No. 2020-189068 (Patent Document 11) discloses a fall prevention device usage status monitoring device in which a pressure-sensitive sensor is provided on the annular inner curved portion of the hook portion at the tip of the lanyard, and transmits to the outside information on whether or not the hook portion is engaged with the rope portion of the lanyard, the main rope, or the handrail, and the administrator receives this information and generates an alarm if there is no hook engagement status information when a predetermined altitude information and information that work is in progress have been received.

[0007] In addition, Japanese Patent Publication No. 2021-068116 (Patent Document 12) discloses an alarm system for high-altitude work sites, comprising a master unit installed at the work site and transmitting identification information related to the work site, and a slave unit attached to the worker and receiving information transmitted from the master unit, wherein the slave unit is equipped with a hook detection switch unit that detects whether or not the hook portion is hooked to the hook fastening member of the lanyard, and a function that transmits the detection result information of the hook detection switch unit to the master unit, and is configured to emit an alarm from the master unit when a worker is at a high-altitude work site and the hook is not fastened to the lifeline or handrail, etc. Furthermore, Japanese Patent Publication No. 2021-129953 (Patent Document 13) discloses a work safety management system that, after taking a picture of the work site where a worker is working and acquiring a site image, determines the usage status of the hook portion from the color image attached to the hook portion and the color image attached to the handrail portion or lifeline portion of the site from the image information.

[0008] Other examples include Japanese Patent Publication No. 2022-131652 (Patent Document 14), which discloses a "safety management support system" configured to have a sensor unit on the worker's side that detects the wearing and usage status of the safety belt and a transmission function that transmits the detection information to the outside, and a manager that receives this information to determine whether the worker's safety belt usage is appropriate and issues an alarm. Furthermore, Japanese Patent Publication No. 2023-074846 (Patent Document 15) discloses a system in which a wireless tag is attached to the hook part of the lanyard carried by the worker, and the wireless tag reads whether the hook part is locked to the hook holder and transmits the information to the outside, and also takes pictures of the work site. A fall arrest device and safety system have been disclosed that include a camera that captures images, transmits the captured information to the outside, identifies the worker and determines their position at a high altitude from that information, and then issues an alarm if the use of the lanyard is inappropriate. Furthermore, Japanese Patent Publication No. 2024-033831 (Patent Document 16) discloses a hook attachment / detachment status detection means that detects whether the hook is attached to a handrail or lifeline, a transmission means that transmits that information to the outside, and a fall arrest device monitoring system and hook holder configured so that an external manager can analyze the information on a monitor and notify the worker of that information.

[0009] In addition, Japanese Patent Publication No. 2022-015650 (Patent Document 17) discloses a hook in a double lanyard in which the opening and closing mechanism of each hook is configured such that when one hook is open, the other hook is closed. As mentioned above, in order to prevent accidents involving workers falling from heights, it is mandatory to have workers wear harness-type safety belts. The harness-type safety belt (hereinafter simply referred to as "safety belt") consists of multiple belts that come into contact with the worker's shoulders, thighs, chest, or torso. For example, a lanyard with a hook at one end is attached to the back of the safety belt via a device called a D-ring. On the other hand, the other end of the lanyard is typically equipped with a curved hook that can be engaged with and secured to a handrail or safety rope, which are inevitably installed at high-altitude work sites. Then, a worker equipped with a safety harness having the aforementioned configuration attaches the hook portion to a handrail installed at a high-altitude work site and performs their work.

[0010] On the other hand, workers frequently need to attach and detach hooks to handrails or safety ropes when moving around at high altitudes. As a result, many workers find this process cumbersome and choose to perform their work at heights without using the hooks. Therefore, site managers and supervisors must ensure that workers use safety harnesses properly while working in order to prevent workplace accidents. However, it is extremely difficult to constantly monitor multiple workers working at distant, high-altitude sites.

[0011] However, in remote locations, during cloudy weather, or at night, under relatively dark conditions, it can be difficult for workers to confirm the location and installation status of the hook. Furthermore, it can be difficult for site managers and supervisors to visually confirm the installation status of the fall arrest hook from a relatively distant location. The inventors of the present invention have diligently analyzed the causes of accidents in the past in which workers have fallen or toppled from high-altitude work sites. As a result, they have found that the main cause is a lack of safety awareness among individual workers. In particular, workers who have worked at high-altitude work sites for many years or more tend to underestimate or ignore the dangers of working at height due to their familiarity with the work. Consequently, they have found that a considerable number of workers, despite consciously ignoring the existence of work standards and performing dangerous work in the high-altitude work area, voluntarily detach the hook from the handrail, safety rope, or other securing member in the work area and perform the prescribed work, resulting in accidents. [Prior art documents] [Patent Documents]

[0012] [Patent Document 1] Japanese Patent Publication No. 2011-104339 [Patent Document 2] Special Table 2013-500112 Gazette

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Patent Document 7

Patent Document 8

Patent Document 9

Patent Document 10

Patent Document 11

Patent Document 12

Patent Document 13

Patent Document 14

Patent Document 15

Patent Document 16

Patent Document 17

Summary of the Invention

Problems to be Solved by the Invention

[0013] Therefore, the object of the present invention is developed to surely solve many problems in the above-mentioned prior art. In other words, the basic technical concept of the present invention is to introduce a system that prohibits workers from freely opening and closing the internal space area, which is provided to either introduce a hook-locking device consisting of a lifeline or handrail, etc., into or out of the internal space area, when a worker is engaged in dangerous work in the high-altitude work area, and to allow the worker to freely open and close the internal space area, which is originally set up to allow the worker to open and close it at their own discretion. The system prevents workers from freely opening and closing the internal space area at their own discretion unless they have permission from a designated site manager or supervisor. [Means for solving the problem]

[0014] In other words, the first aspect of the basic technical concept of the present invention is a fall prevention system for workers in high-altitude work areas, in which a lanyard body is provided with a hook body that includes a curved hook portion that can be attached to a hook fastener (hereinafter simply referred to as a hook fastener) made of an appropriate lifeline or handrail, and the lanyard body is fixed to a part of the worker's body via an appropriate connecting member such as a harness, waist belt, chest belt, or hip belt, and the hook body includes, in addition to the curved hook portion, the hook The internal space area of ​​the hook is provided with an internal space area opening / closing mechanism for opening or closing the internal space area in order to introduce the hook locking device into the internal space area or to discharge the hook locking device from the internal space area to the outside, and the internal space area opening / closing mechanism is configured to have an operating function that allows the worker to control the internal space area opening / closing mechanism to either an open state or a closed state based on their will, and the internal space area opening / closing mechanism responds to a command signal based on the judgment of the site manager / supervisor. In response, the system is characterized in that the operation function of the opening and closing mechanism for the internal space area is blocked regardless of the worker's will, and in a second aspect of the basic technical concept of the present invention, one or more (preferably two) lanyard bodies are provided, each having a hook body with a curved shape that can be attached to a hook fastener (hereinafter simply referred to as a hook fastener) made of a suitable lifeline or handrail, etc., at at least one end of the lanyard body, and the hook body is provided with a hook body with a curved shape that can be attached to a hook fastener (hereinafter simply referred to as a hook fastener) made of a suitable lifeline or handrail, etc., and the lanyard body is provided with a hook body at the worker's body In part, a fall prevention system for workers in high-altitude work areas, which is used by fixing it via appropriate connecting members such as harnesses, chest belts, waist belts or hip belts, is provided on the hook body, in addition to the curved hook portion, with an internal space opening / closing mechanism for opening or closing the internal space area in order to introduce the hook fastener into the internal space area or to discharge the hook fastener from the internal space area to the outside, and furthermore, the internal space opening / closing mechanism is operated according to the worker's will,A method for preventing workers from falling from high-altitude work areas using a lanyard that has an operating function that allows the internal space area opening / closing means to be controlled to either an open or closed state, and that the internal space area opening / closing means is configured such that, in response to a command signal based on the judgment of the site manager, the operating function of the internal space area opening / closing means is blocked by a locking mechanism connected to the internal space area opening / closing means, regardless of the worker's will, in response to a command signal based on the judgment of the site manager, and is characterized in that, after the worker wearing the lanyard enters the safety area and the hook portion of the hook body is secured to a locking device in the safety area, the operating authority for the internal space area opening / closing means of the hook body is controlled by the worker's manager or supervisor during the period from when the worker leaves the safety area, through the work area, and returns to the safety area. [Effects of the Invention]

[0015] The worker fall prevention system and method for worker fall prevention in high-altitude work areas according to the present invention employ the novel and inventive technological configuration described above, and as a result, completely prohibits workers from freely opening and closing the internal space area opening / closing means attached to the lanyard when they are engaged in dangerous work in the high-altitude work area, based on their own will. Therefore, it can exert a remarkable effect of completely preventing fall accidents or slip-and-fall accidents caused by arbitrary actions of workers as described above. [Brief explanation of the drawing]

[0016] [Figure 1] Figure 1 is a schematic diagram illustrating the general configuration of the worker fall prevention system including the hook body 3 according to the present invention. [Figure 2] Figure 2 is a block diagram illustrating the general outline of the worker fall prevention method according to the present invention. [Figure 3]Figure 3 is a flowchart illustrating the general procedure for the worker fall prevention method using a single lanyard according to the present invention. [Figure 4] Figure 4 is a flowchart illustrating the general procedure for the worker fall prevention method using a double lanyard according to the present invention. [Figure 5] Figure 5 shows an example of the structure of a single lanyard used in the present invention. [Figure 6] Figure 6 shows an example of the structure of a double lanyard used in the present invention. [Figure 7] Figure 7 shows another example of the structure of a double lanyard used in the present invention. [Figure 8] Figure 8 is a flowchart illustrating the procedure for the changes in the operating and non-operating states of the opening and closing means of the internal space areas of each hook body when a double lanyard is used in the present invention and the safety management mode state is set. [Figure 9] Figure 9 is a diagram illustrating the general configuration when the safety management mode state is set in the present invention when a double lanyard is used, and the changes in the individually operable / unoperable state of the opening / closing means of each internal space area of ​​each hook body in the safety management mode state. [Modes for carrying out the invention]

[0017] Specific examples of the worker fall prevention system and worker fall prevention method in high-altitude work areas according to the present invention will be described in detail below with reference to the drawings. First, the worker fall prevention system for high-altitude work areas according to the present invention will be described in detail with reference to Figures 1 and 2. In other words, the present invention covers both the conventionally known single-type lanyard and the double-type lanyard.

[0018] Here, the single-type lanyard, as shown in Figure 5, has a hook body 3 with an appropriate shape that can engage with the hook fastener at one end 2 of the lanyard body 1, and at the other end 4 of the lanyard body 1, there is a so-called carabiner 5 that can be freely connected and engaged with an appropriate part of the harness having the appropriate structure described above, and can be attached to a part of the worker's body 300. On the other hand, an example of the double lanyard, as shown in Figure 6, uses two single-type lanyards having the structure shown in Figure 5 as a pair, and at one end 4,4' of each lanyard body, there is a carabiner 5 Alternatively, appropriate connecting ring portions 6, 6' may be provided instead, and these may be configured to engage with a connecting ring portion 8 joined to an appropriate carabiner portion 5. Or, as shown in Figure 7, a first hook body portion 3 of an appropriate configuration may be provided at one end 2 of a single lanyard body portion 1, a second hook body portion 3' of an appropriate configuration may be provided at the other end 4 of the lanyard body portion 1, and a connecting ring portion 6 of an appropriate configuration may be provided at approximately the center 9 of the lanyard body portion 1, and the connecting ring portion 6 may be configured to engage with a connecting ring portion 8 joined to an appropriate carabiner portion 5.

[0019] Furthermore, it is desirable that an appropriate energy absorption section 7 be provided between the carabiner section 5 and the connecting ring section 6, as shown in Figures 6 and 7. The basic technical configuration of a worker fall prevention system in a high-altitude work area using a single lanyard, which is the first embodiment of the present invention, will be described below. In other words, the basic technical configuration of the worker fall prevention system according to the present invention is as described above, a worker fall prevention system 100 for use in high-altitude work areas, in which a hook body 3 including a curved hook portion 11 that can be attached to a hook fastener 10 (hereinafter simply referred to as a hook fastener) made of an appropriate lifeline or handrail is provided at least one end 2 of the lanyard body 1, and the other end 4 of the lanyard body 1 is fixed to a part of the worker's body using an appropriate connecting member such as a harness, chest belt or waist belt via a well-known carabiner portion, and the hook body 3 is used in which, in addition to the curved hook portion 11, the hook fastener 10 is introduced into the internal space area 12 of the hook portion 11, or the hook fastener 10 is brought out from the internal space area 12 to the outside The system for preventing workers from falling in high-altitude work areas is characterized by the following features: an internal space area opening / closing means 13 is provided to drive an opening / closing valve 15 for opening or closing the internal space area 12 in order to discharge waste; the internal space area opening / closing means 13 is configured to have an operating function that allows the worker to control the operation of the internal space area opening / closing means 13 to either an open state or a closed state based on the worker's will; and in addition, the internal space area opening / closing means 13 is configured to block the operation function of the internal space area opening / closing means 13 in response to a command signal based on the judgment of the site manager, regardless of the worker's will (a state in which the worker cannot freely operate the internal space area opening / closing means 13).

[0020] In other words, in the first aspect of the present invention, the internal space area opening / closing means 13 of the hook body 3 is basically configured so that the internal space area 12 can be opened or closed by the worker's manual operation based on the worker's own will, thereby enabling the worker to introduce the hook locking device 10 into the internal space area 12 of the hook part 11 and engage / lock the hook body 3 with the hook locking device 10, or to detach it from the hook locking device 10. In addition, if a designated site manager or supervisor deems it necessary, they can issue an appropriate command to stop the operation function of the internal space area opening / closing means 13, completely prohibiting the worker from operating the internal space area opening / closing means 13 arbitrarily based on their own will.

[0021] In the present invention, of course, if the designated site manager or supervisor no longer feels the need for it, the restriction is lifted, and the worker can freely operate the internal space area opening / closing means 13 manually at their own discretion. In the worker fall prevention system 100 for work areas at height according to the present invention, in normal circumstances, the worker 300 can, for example as shown in Figure 1, press a push key 14 provided on the internal space area opening / closing means 13, thereby rotating an appropriate opening / closing valve 15 provided on the hook body 3 to the left or right as indicated by the arrow, thereby opening or closing the internal space area 12, and introducing and engaging the hook locking device 10 into the internal space area 12, or discharging the hook locking device 10 from the internal space area 12.

[0022] Furthermore, in the present invention, for example, the above configuration system is further equipped with a locking mechanism 16 to restrict or block the free driving operation of the internal space area opening / closing means 13 by the worker. More specifically, the internal space area opening / closing means 13 is further equipped with a locking mechanism 16 that receives an appropriate control signal from the outside and, based on the external control signal, restricts or blocks the opening and closing operation of the internal space area opening / closing means 13. In the present invention, it is desirable that the external signal is transmitted from an appropriate external management and supervision center 400 located remotely from the worker's current location to the locking mechanism 16 by the worker's direct supervisor 200, via wired or wireless means as needed. It is also desirable that the locking mechanism 16 has the function to properly receive the wireless external signal.

[0023] In the present invention, a preferred example of the timing for the supervisor 200 to transmit the external signal to activate the locking mechanism 16 and restrict or block the opening and closing operation of the internal space area opening / closing means 13 is immediately after the supervisor 200 has confirmed that the worker 300 has entered a designated safety area or work area and has engaged and locked the designated lanyard 3 to the designated hook locking device 10. On the other hand, the configuration of the lock mechanism 16 is not particularly specified, but for example, as shown in Figure 1, it is desirable that the lock mechanism 16 be provided with an appropriate drive stop device 161 that is directly or indirectly connected to the drive mechanism of the internal space area opening / closing means 13, and it is preferable that it be driven using an electronic (solenoid) valve type lock mechanism. To give a more specific example, in the present invention, the technical configuration for making the opening and closing operation of the internal space area opening / closing means 13 inoperable under specific conditions is not particularly limited, and it is possible to utilize known mechanical means. For example, this can be achieved by electrically inserting an appropriate stopper member into a part of the opening and closing drive mechanism of the opening and closing means 13 using an electromagnetic magnet mechanism. Alternatively, as will be described later, when using a double lanyard, it is also possible to configure the opening and closing drive mechanisms of the opening and closing means 13 to be programmed and controlled according to an appropriate mode selected from appropriate setting conditions in the safety management mode state, as will be described later.

[0024] Furthermore, a preferred specific example is that the locking mechanism 16 includes a control unit (CTR) 162 for receiving the external control signal and controlling the drive stop device 161 to an operating state (ON state) or a non-operating state (OFF state) in response to the control signal, as well as an appropriate battery unit 163. Furthermore, the configuration of the external management and supervision center 400 is not particularly specified, but a preferred example is that it includes a monitor unit 401 directly and continuously managed by the manager 200, an appropriate storage unit 402, an appropriate computing unit (CPU) 403, and an appropriate information transmission and reception unit 404. Furthermore, when controlling the lock mechanism 16 for limiting the drive function of the internal space area opening / closing means 13 in the present invention with an electronic valve or solenoid valve, it is possible to use, for example, an electronic lock key. However, such an electronic lock key must be designed so that it can only be used by the supervisor 200, and utmost care must be taken to ensure that the electronic lock key does not fall into the hands of the worker 300.

[0025] Next, as another specific example of the present invention, it is preferable to provide an engagement state sensing sensor 17 in a part of the curved hook portion 11, preferably near the portion that directly contacts the hook locking device 10, for sensing the engagement state between the hook portion 11 and the hook locking device 10. The purpose of adopting this configuration is that reliably confirming whether the hook portion 11 and the hook-locking device 10 are actually in contact with each other and engaged is extremely important information for the system operation of the present invention. Therefore, it is possible to notify workers or supervisors by activating a light-emitting or sound-emitting notification device 19, and it is also desirable that the information be transmitted sequentially to the supervisor 200 at the external management and supervision center 400 via an external transmission means. Therefore, it is desirable that the engagement state sensing sensor unit 17 use, for example, a well-known pressure sensor. On the other hand, as a further specific example in the present invention, it is also preferable to provide a suitable material information acquisition sensor unit 18 in a part of the curved hook portion 11, preferably near the portion that directly contacts the hook locking device 10, which is engaged with the hook portion 11, in order to detect and acquire information such as the material or strength of the hook locking device 10.

[0026] The purpose of adopting such a configuration is that determining whether the hook-locking device 10 with which the hook portion 11 is engaged is actually a pre-defined normal hook-locking device 10 is just as important information as described above. Therefore, it is desirable to provide a material information acquisition sensor unit 18 that can acquire information such as its strength, material, diameter, or surface gloss, and to configure the system so that the acquired information is transmitted sequentially to the supervisor 200 of the external management and supervision center 400. In other words, another specific example of the present invention is a worker fall prevention system characterized in that an engagement state sensing sensor unit 17 for sensing the engagement state between the hook portion 11 and the hook locking device 10 and / or an appropriate material information acquisition sensor unit 18 for detecting and acquiring information such as the material or strength of the hook locking device 10 that is engaged with the hook portion 11 is provided in a part of the curved hook portion 11, preferably near the part that directly contacts the hook locking device. Furthermore, it is a preferred specific example that the engagement state sensing sensor unit 17 and / or the material information acquisition sensor unit 18 include an appropriate notification means 19 having a transmission function for transmitting the detection result information to the outside and / or a notification function for notifying the outside of the information by optical means or acoustic means.

[0027] On the other hand, as described above, in the present invention, it goes without saying that the external signal is transmitted by a designated supervisor 200 located in a management and supervision center 400, which is in a remote location different from the designated work area 501 where the worker 300 is located, to the outside by wired or wireless means as needed. Next, we will describe some specific examples of a second aspect of the present invention, which is a method for preventing workers from falling in high-altitude work areas. First, we will explain in detail the basic configuration of the method for preventing workers from falling in high-altitude work areas according to the present invention, with reference to the drawings. Figure 2 is a schematic diagram illustrating an example of the basic procedure for a worker fall prevention method in which the worker fall prevention system described above is used to manage the actions of workers in order to prevent workers from falling while working in high-altitude work areas, as described in the present invention.

[0028] In other words, in the figure, a starting area (safety area) 500 and one or more work areas 501, 502, 503... are provided adjacent to it, and hook fasteners 10, 10', 10”, 10'', 10''''... consisting of handrails or lifelines are stretched across each of the safety area 500 and the work areas 501, 502, 503.... Incidentally, the hook fasteners 10, 10', 10'', 10'''', etc. are installed in a continuous manner throughout the safety area and each work area. However, in some cases, due to the relative positions of adjacent areas, or if there are obstacles in or near the inside or outside of the area, the continuity between the hook fasteners 10, 10', 10'', etc. may be interrupted in between. Furthermore, while there may be only one work area 501..., it goes without saying that depending on the work environment, multiple work areas may be established. Furthermore, in Figure 2, it goes without saying that an external management and supervision center 400 having the same functions as the external management and supervision center 400 shown in Figure 1 is installed in a location remote from the aforementioned safety area 500 and work areas 501, 502, 503, etc. The supervisor 200 is stationed at this external management and supervision center 400 at all times to monitor and supervise the individual actions of each worker 300. Furthermore, this technical configuration can also be implemented using a smartphone or similar device carried by the supervisor 200, in which case the supervisor 200 does not need to be stationed at the external supervisory center 400 at all times. Although Figure 2 shows a situation where only one safety zone 500 is provided, in reality, the work area at height can be quite large, and the movement of the workers 300 can also be complex. For example, if the work area is a large building, there may be a considerable distance between the work area on the front side and the work area on the back side. In such cases, setting up separate safety zones 500 on the front and back sides of the building can shorten the movement of workers, greatly contributing to saving time and avoiding danger. In other words, Figure 2 is displayed with this scenario in mind. Next, a specific example of the basic procedure for preventing workers from falling in high-altitude work areas according to the present invention will be described below.

[0029] In other words, first, the supervisor 200 assumes that one or more workers 300, who have already attached one or more (preferably two) of the single lanyards to a part of their body, are waiting to enter the safety area 500, which is a place for prior consultation and safety confirmation regarding the prescribed work content and the associated safety management procedures. Furthermore, even when multiple workers 300 perform a specific task as a group, it is desirable that the designated construction supervisor 200 and the multiple workers 300 hold a prior meeting regarding the prescribed work content and work route before entering the starting area (safety area) 500. It goes without saying that the preliminary meeting may take place within the designated safety zone.

[0030] Furthermore, as a specific example of the basic technical configuration of the method for preventing workers from falling in high-altitude work areas as a second embodiment of the present invention, for example, one or more (preferably two) lanyard body parts 1, each having a hook body part 3 including a curved hook part 11 that can be attached to a hook fastener (hereinafter simply referred to as a hook fastener) 10 consisting of an appropriate lifeline or handrail, are attached to a part of the body of the worker 300, along with an appropriate harness, chest belt, waist belt, or hip belt. A worker fall prevention system for use in high-altitude work areas, which is fixed and used via connecting members (not shown), wherein the hook body 3 is provided with an internal space area opening / closing means 13 for operating an opening / closing valve 15 to open or close the internal space area 12 in order to introduce the hook locking device 10 into the internal space area 12 or to discharge the hook locking device 10 from the internal space area 12 to the outside, and further, the internal space area opening / closing means 13 The device has an operating function that allows the worker 300 to control the internal space area opening / closing means 13, which is used to displace the opening / closing valve section 15, to either an open state or a closed state, and the internal space area opening / closing means 13 is controlled by a locking mechanism 16 connected to the internal space area opening / closing means 13, which restricts the opening and closing operation of the internal space area opening / closing means 13, regardless of the worker 300's will, in response to a command signal based on the judgment of the site manager 200. A method for preventing workers from falling in a work area at height, using one or more lanyards 1 configured to lock (disable the operating function), wherein after a worker wearing the lanyard 1 enters a safety area 500, and the hook portion 11 of the hook body 3 is secured to a locking device 10 in the safety area 500, the worker 300 completes a predetermined task from the safety area 500 through the work area 501 (or possibly one or more further work areas) and returns to the safety area,This is a method for preventing workers from falling from elevated work areas, configured such that the authority to operate the opening / closing mechanism 13 of the internal space area of ​​the hook body 3 is controlled by the supervisor 200 of the worker 300.

[0031] Here, we will explain in detail the more specific steps for implementing the method for preventing workers from falling in high-altitude work areas according to the present invention, with reference to a portion of the flowchart in Figure 3. Specifically, the process involves: first, a worker 300 wearing the lanyard 1 and the supervisor 200 holding a preliminary meeting (Step 1) regarding the work content or the condition of the work area before the required work begins; second, instructing the worker 300 to enter the safety area 500 (Step 2); third, after the supervisor 200 confirms that the worker 300 has entered the safety area 500, setting the locking mechanism 16 to a non-operational state (OFF) (Step 3); and fourth, the worker 300 attaching the hook portion 11 to the hook fastener 10 inside the safety area 500. Step 4 involves giving instructions to the worker; Step 5 involves the supervisor 200 confirming that the hook portion 11 is secured to the hook fastener 10 in the safety area 500, and then instructing the worker 300 to move to the designated work area 501; Step 6 involves the worker 300 removing the hook portion 11 from the hook fastener 10 in the safety area 500, moving to the work area 501, and securing the hook portion 11 to the hook fastener 10' in the work area 501 before, during, or after the move; and Step 3 Step 7: Notifying the supervisor 200 that the movement from 00 to the work area 501 has been completed and that the hook portion 11 has been locked to the hook locking device 10' in the work area 501; Step 8: Upon receiving the notification, the supervisor 200 confirms the completion of the movement and the locking state of the hook portion 11, sets the lock mechanism 16 to the operational state (ON), and instructs the worker to perform the predetermined work; Step 9: Notifying the supervisor 200 that the predetermined work has been completed within the predetermined work area 501; and Step 10 involves the following steps: the lock mechanism 16 is set to the inactive state (OFF), the hook portion 11 is removed from the hook locking device 10' in the work area 501 by following the reverse procedure of the above steps, and after it is locked to the hook locking device 10 in the safety area 500, the supervisor 400 is notified that the worker 300 has moved into the safety area 500; and the supervisor 200, after confirming that the worker 300 has returned to the safety area 500, keeps the lock mechanism 16 in the inactive state (OFF) and instructs the worker 300 to:This method for preventing workers from falling from elevated work areas consists of the following steps: a step (step 11) instructing the worker 300 to remove the hook portion 11 from the hook fastener 10 within the safety area 500; and a step (step 12) instructing the worker 300 to leave the safety area 500 after the supervisor 200 has confirmed that the worker 300 has removed the hook portion 11.

[0032] In the present invention described above, when a single lanyard is used, and the hook fasteners 10 and 10' of the safety area 500 and the work area 501 are in a continuous state, the basic configuration of the present invention described above is slightly modified, and as a specific example, although not shown in the figures, the operating procedure is as follows. Specifically, the process involves the worker 300 wearing the lanyard 1 and the supervisor 200 holding a preliminary meeting (Step 1) regarding the work content or the condition of the work area before the required work begins; the supervisor instructing the worker 300 to enter the safety area 500 (Step 2); the supervisor 200 confirming that the worker 300 has entered the safety area 500 and then setting the locking mechanism 16 to a non-operational state (Step 3); and the worker 300 attaching the hook portion 11 to the hook-locking device 10 in the safety area 500. Step 4 involves the locking process; Step 5' involves the supervisor 200 confirming that the hook portion is locked to the hook locking device 10 within the safety area 500, setting the lock mechanism 16 to an operational state, and then instructing the worker 300 to move to the designated work area 501; Step 6' involves the worker 300 moving to the work area 501 while shifting the hook portion 11 while keeping it locked to the hook locking device 10'; and the worker informing the supervisor 200 that the move into the work area is complete. Step 7' is to notify the supervisor that the worker has moved into the safety area 500, and Step 8' is to instruct the worker 300 to perform the prescribed work in the work area 501 after the supervisor 200 has confirmed the completion of the transition, and Step 9' is to have the worker 300 report to the supervisor 200 that the prescribed work has been completed, and then, after confirming the completion of the move, the worker 300 performs the prescribed work in the work area (Step 7'), and subsequently, Step 10 is to notify the supervisor 200 that the worker 300 has moved into the safety area 500, and the supervisor 200 This method for preventing workers from falling from a work area at height consists of the following steps: (Step 11) The supervisor 200 confirms that the worker 300 has returned to the safety area 500, sets the locking mechanism to a non-operating state, and instructs the worker 300 to remove the hook part 11 from the hook locking device 10 within the safety area 500; and (Step 12) The supervisor 200 confirms that the worker 300 has removed the hook part 11, and instructs the worker 300 to leave the safety area 500.

[0033] On the other hand, in the present invention, in a method for preventing workers from falling from a work area at height using a single lanyard, another specific example is when there are two or more work areas, and when a predetermined task is completed in one work area 501, the worker 300 does not return to the safety area 500 but moves directly to the second work area 502 to perform another predetermined task. A specific example in such a case is, for example, in the specific example described above, after the worker 300 notifies the supervisor 200 (step 9) that the prescribed work has been completed within the prescribed work area (first work area) 501, the supervisor 200 may, if necessary, determine whether there is another work area (step 13), and if it is determined that there is another work area, then, after step 14, instruct the worker 300 to move to another prescribed work area (second work area) 502 and perform the prescribed work (step 15). (In this case, if there is another work area, it is assumed that this has been confirmed in advance between the supervisor 200 and the worker 300) If the hook fasteners 10' and 10'' in the first work area 501 and the second work area 502 are continuous, the lock mechanism 16 is kept in the operating state (ON), or if the hook fasteners 10' and 10'' in the first work area 501 and the second work area 502 are not continuous, the lock mechanism 16 is kept in the deactivated state. (Step 16) is a step of resetting to (OFF), and the worker 300 moves the hook portion 11 by sliding it from the hook fastener 10' in the first work area 501 to the hook fastener 10'' in the second work area 502, or the worker 300 removes the hook portion 11 from the hook fastener 10' in the first work area 501 and fastens the hook portion 11 to the hook fastener 10'' in the second work area 502 before, during, or after moving to the second work area 502 (Step 1 7) The process (18) in which the worker 300 notifies the supervisor 200 that the transition to the second work area 502 is complete and the hook portion 11 is locked to the hook locking device 10" in the second work area 502, and the process (19) in which the supervisor 200, after confirming the completion of the transition and the locking status of the hook portion 11, maintains the lock mechanism 16 in the operational state (ON), or if it was in the inactive state (OFF), resets it to the operational state (ON), and instructs the worker to perform the predetermined work.It is desirable to adopt a procedure that includes the addition of steps 20 (step 20) in which the worker 300 notifies the supervisor 200 that the prescribed work within the area has been completed, and then, after step 21, returns to step 13, which will be described later.

[0034] Figure 3 shows a flowchart summarizing the specific examples of the methods described above for preventing workers from falling from the elevated work area using a single lanyard. In other words, basically, each step from step 1 to step 9 in the diagram is executed sequentially, and in step 9, when a notification is sent to the supervisor 200 that the worker 300 has completed the prescribed work in the first work area 501, a new decision step (step 13) is added, and it is determined whether the work area where the prescribed work has now been completed is the last work area. In other words, if there are multiple (N) work areas in step 13, first, the calculation N-1 is performed to determine whether N=0 or not. If N=0, it is determined that there are no other work areas, and the worker 300 returns to the safety area 500. On the other hand, if there are multiple work areas (N), for example three, then at the completion of the first work, N-1 will not be 0, and the existence of another work area 502 will be confirmed. Therefore, the value N will be changed to N-1, and the system will move to the new work area and repeat the operations as described above. Specifically, in step 13, it is determined whether N=0 or not. If it is YES, each of the steps from step 10 to step 12 described above is executed, and the process ends. On the other hand, if it is NO in step 13, in step 14, (N) is changed to (N-1), and each of the steps from step 15 to step 21 described above is executed, and the process returns to step 13, and each of the steps from step 13 onwards is repeated, and the process ends.

[0035] In the present invention, it is preferable to transmit information on the work status of individual workers 300 or the operation status of the hook body 3 to the external management and supervision center 400 wirelessly or via wired connection. It is also preferable to configure the system so that detection data detected by the various sensor units 17, 18, etc., is transmitted sequentially to the external management and supervision center 400. Furthermore, in order to collect related information, appropriate surveillance cameras and position sensors 20 may be placed near each of the areas 500 to 503... to detect the individual movements of each worker 300 and transmit the information as three-dimensional information. Alternatively, appropriate motion capture devices 20 may be placed in the safety area and each work area, and their three-dimensional position information may be collected at the external management and supervision center 400. Furthermore, one preferred example is to have some of the individual workers 300 wear personal identification tags containing appropriate information, and to collect location information of each worker using appropriately placed tag reading means and transmit it to the external management and supervision center 400.

[0036] Next, as another specific example of the first technical aspect of the present invention, the operating procedure of the system and method when using the double lanyard described above will be explained. In other words, while the above-mentioned specific example used a single lanyard 1 having the structure shown in Figure 5, this specific example uses a lanyard 1 having two hook body parts 3 and 3' as shown in Figure 6, or two or more lanyards 1 and 1' having the single shape described above, as shown in Figure 7. In the present invention, when the double lanyard is used, as described above, the configurations of the first hook body 3 and the second hook body 3' can be basically the same as those shown in Figure 1, and it is also desirable that the configuration of the management and supervision center 400, which is provided to communicate with each of the respective hook body 3 and 3', adopts the configuration shown in Figure 1.

[0037] The worker fall prevention system using a double lanyard in the first aspect of the present invention will be described in detail below with reference to Figure 4. In other words, to describe the basic configuration using the double lanyard in the present invention, the double lanyard is provided with a first hook body 3 and a second hook body 3', and each of the hook body 3, 3' is provided with an internal space area opening / closing means 13, 13' for opening or closing the internal space area 12, 12' in order to introduce the hook locking device 10 into the internal space area 12, 12' or to discharge the hook locking device 10 from the internal space area 12, 12' to the outside, and furthermore, the internal space area opening / closing means 13, 13' is operated based on the will of the worker 300. The internal space area opening means 13, 13' are configured to have an operation control function that allows them to be operated to either an open state or a closed state, and the internal space area opening / closing means 13, 13' in both or either the first hook body 3 and the second hook body 3' are configured to respond to a command signal based on the judgment of the site manager 200, regardless of the worker's will, to set the operation function of the internal space area opening / closing means 13, 13' to a safety management mode state, and at least a part of it is blocked and rendered inoperable (so that the worker cannot operate the internal space area opening / closing means 13, 13' of their own free will).

[0038] In this specific example, compared to the previously mentioned example, the first locking mechanism 16 and the second locking mechanism 16' provided on the first hook body 3 and the second hook body 3' have substantially the same basic circuit configuration. However, it is necessary to individually drive and control the internal space area opening / closing means 13 and 13' in the first and second hook body 3 and 3'. Accordingly, it is necessary to configure the internal circuit configuration and / or software settings, and to set identification symbols that can individually and independently identify each of the internal space area opening / closing means 13 and 13'. In other words, in the specific example of the present invention described above, when using a double lanyard, the main technical component is determining in what pattern to make the internal space area opening / closing means 13, 13' of the first hook body 3 and the second hook body 3' operable (unlocked) or inoperable (locked).

[0039] In this specific example of the present invention, as described above, for example, if the drive operation function of the internal space area opening / closing means 13 in the first hook body 3 is set to an operable state, it is possible to set the drive operation function of the internal space area opening / closing means 13' in the second hook body 3' to an operable state, and the opposite state may also be adopted. Furthermore, both the first hook body 3 and the second hook body 3' are set to an operable state by the worker, and the worker can operate either the hook body 3 or 3' at will, but it is important that they are set so that both cannot be operated simultaneously (corresponding to the first embodiment). In that case, if the worker operates either of the hook body parts 3 or 3', the hook body part 3 or 3' that was used will be immediately set to a non-operable state, and at the same time, the other hook body part 3' or 3 that was not selected will be set to be operable instead. The combination of the first hook body 3 and the second hook body 3' being operable or inoperable, as described above, is outlined in Figure 9(B).

[0040] In this specific example, if the worker 300 operates the internal space opening / closing means 13 or 13' of either of the hook body parts 3 or 3' that is set to be operable, the operation of the internal space opening / closing means 13 or 13' of the hook body part 3 or 3' is immediately disabled, and the operation of the internal space opening / closing means 13' or 13 of the other hook body part 3' or 3 is automatically enabled (corresponding to the second and third embodiments). Furthermore, in this specific example, both the internal space area opening / closing means 13 and 13' in the first hook body 3 and the second hook body 3' can be set to a non-operational state simultaneously. In this case, it is sufficient to resolve the safety management mode state. In other words, in this specific example, the following preferred configurations are basically considered for the safety management mode state. In other words, based on the judgment of the supervisor 200, control is made to appropriately activate or deactivate one or both of the first locking mechanism 16 and the second locking mechanism 16', thereby setting (1) the first hook body 3 and the second hook body 3' to a state in which the worker can operate either of them (this is referred to as the first mode), which is a mode that is mainly used in the initial stages when the safety management mode state is set, but on the other hand, in this mode, the first hook body 3 and the second hook body 3' are set so that they cannot be operated at the same time. In contrast to the above, a second embodiment is that, for example, the first hook body 3 can be set to be operated by the worker, while the second hook body 3' can be set to be inoperable by the worker. In a third embodiment, contrary to the above embodiment, for example, the second hook body 3' can be set to be operated by the worker, while the first hook body 3 can be set to be inoperable by the worker. In the present invention, when the above-described safety management mode state is set, the supervisor 200 can individually control and manage which mode to adopt and implement by creating an appropriate program in advance, taking into consideration the working environment and working conditions in the safety area and / or each work area.

[0041] In the present invention, as described above, it is necessary to prevent the worker 300 from arbitrarily operating the internal space area opening / closing means 13, 13' when there is a particular need to do so. Therefore, it is desirable to appropriately select the necessary embodiment from the three embodiments described above. Specifically, in the present invention, in order to realize the operating procedures of each of the above embodiments, it may be realized by a mechanical design based on a mechanical concept, or by creating appropriate software and a control method that enables the desired operation of each locking mechanism 16 in response to the electronic information provided by the software, and an electronic circuit configuration is required for this purpose. For example, in the present invention, the internal space area opening / closing means 13, 13' in the first hook body 3 and the second hook body 3' are further provided with locking mechanisms 16, 16' for receiving the external control signal and individually or simultaneously restricting the opening and closing operation of the internal space area opening / closing means 13, 13' based on the external control signal, and it is desirable that each of these components be configured to operate in response to the command of the external signal.

[0042] Furthermore, in the second and third embodiments described above, as already explained, it goes without saying that when the worker 300 operates the operable first hook body 3 to lock the hook portion 11 to the hook locking device 10'' in the designated work area, and this fact is confirmed, the first hook body 3 becomes inoperable, and in exchange, the second hook body 3' becomes operable. Furthermore, it is desirable to consider methods such as constructing a mechanical selection system or using software to generate appropriate control signals in order to enable the worker 300 to either set either hook body 3 or 3' in a state where it cannot be freely operated by the worker 300, or to set either hook body 3 or 3' in a state where it can be freely operated by the worker 300. Furthermore, it is desirable to execute such control processes using AI technology. Furthermore, although the above-mentioned specific example assumes that there is only one worker 300 entering the work site and only one supervisor 200 overseeing them, in reality, it is expected that multiple workers 300 will frequently enter the same work site simultaneously. Therefore, it is desirable to assign an individual identification number to each worker 300 so that at least one supervisor 200 can manage multiple such workers 300, and to ensure that the above-mentioned management methods are carried out individually for each identification number.

[0043] In the present invention, when a double lanyard is used, as described above, for example, a safety management mode state is adopted. To describe a specific example of the safety management mode state in the present invention, when the safety management mode state is set, in the initial setup stage, the internal space area opening / closing means of both the first hook body 3 and the second hook body 3' are set to be operable by the worker 300, but both the first hook body 3 and the second hook body 3' are set to be inoperable by the worker 300 at the same time (corresponding to the first embodiment). Subsequently, when the worker 300 operates either the first hook body 3 or the second hook body 3', the hook body 3 or 3' that was operated on is subsequently set to a deactivated state, and at the same time, the other hook body 3' or 3 is set to an activated state (corresponding to the second embodiment), and the reverse is also true (corresponding to the third embodiment).

[0044] In other words, in this specific example of the present invention, it is desirable that, at the initial setting stage, the internal space area opening / closing means 13, 13' of both the first hook body 3 and the second hook body 3' are set to be operable by the worker 300 (first mode), and when the worker 300 arbitrarily selects and operates either the first hook body 3 or the second hook body 3', the internal space area opening / closing means 13 or 13' of the operated hook body is subsequently set to a deactivated state, and at the same time, the internal space area opening / closing means 13' or 13 of the other hook body 3' or 3 is set to an operable state (second mode), and that the reverse mode (third mode) is also possible. By adopting this configuration, it becomes possible to reliably prevent the occurrence of a serious hazardous situation in which the worker 300 simultaneously detaches both hook portions 11 and 11' of the double lanyard from the hook fasteners 10 and 10'.

[0045] Furthermore, when performing software control by applying the safety management mode to the lock mechanism parts 16, 16' associated with the hook body part 3 or 3' in the present invention, specific examples of when the initial mode, the first mode, and the second mode are applied and set will be explained below. In other words, in the present invention, when the safety management mode is applied, the initial setting mode (the first mode) is basically set first. In other words, when a specific action or instruction occurs in a series of safety measures, for example, when an instruction is given for a worker to move from a safety area to a work area, or when an instruction is given to perform a specific task within a specific work area, it is preferable that the initial setting (the first mode) is adopted first, and then, in conjunction with the worker's actions in performing the designated task, the second mode and the third mode are applied and executed sequentially (it goes without saying that the order in which the second and third modes are applied will vary in response to the worker's actions). Subsequently, if another or further specific action or instruction occurs in the safety measures described above, the system will return from the second and / or third mode to the initial state, the first mode, and the same management and control will be executed. More specifically, to describe an example of the operating procedure in the safety management mode described above, the individual operating modes of the internal space area opening / closing means 13 or 13' in the hook body 3 or 3' under the operating state of the present invention are, for example, basically, when the worker uses the hook parts 11, 11', in the initial setting state, either of the internal space area opening / closing means 13 or 13' of the two hook body parts 3 or 3' is set to be usable (however, both are set to be unusable at the same time), and the worker selects one of the internal space area opening / closing means 13 or 13' in the hook body 3 or 3'. By operating the internal space area opening / closing means 13 or 13' (which temporarily changes another internal space area opening / closing means 13' or 13 to an inoperable state), the hook portion 11 or 11' is removed from the hook fastener 10 in a predetermined area and fastened to the hook fastener 10' in another area. At the same time, the internal space area opening / closing means 13 or 13' that the worker selected and used is subsequently set to an inoperable state, and the internal space area opening / closing means 13' or 13 of another hook body portion 3' or 3 that has not been used until now (which is in an inoperable state) is changed to a state that can be operated by the worker. Then, when the worker uses the internal space opening / closing means 13' or 13 of the other hook body 3' or 3' that has now become operable to detach the hook 11' or 11 from the hook locking device 10 in the predetermined area and lock it to the hook locking device 10' in a different area, the other hook body 3' or 3' is set to a state where it is no longer operable by the worker at this stage, and the internal space opening / closing means 13' or 13' of the other hook body 3 or 3' that was previously set to a state where it was no longer operable by the worker is set to a state where it is once again operable by the worker, and the same operation is repeated thereafter, returning to the initial setting state.

[0046] Such concrete examples can be implemented using mechanical methods or by setting up appropriate programs to implement them in software. By adopting such a configuration, it is desirable to leave room for the worker to arbitrarily select either of the hook body parts 3 or 3' when moving from a designated area (e.g., a safety zone) to another area (e.g., a work area), taking into consideration environmental conditions such as the environment within the area, the placement and arrangement of the hook fastener, or whether or not there are obstacles in the tensioning path of the hook fastener, in order to perform the movement operation in the simplest and easiest way possible. In that sense, there is no particular problem if the hook fasteners 10, 10', 10'', etc., stretched between the safety zone and the work zone, or between multiple work zones, are formed in a continuous manner. However, if the hook fasteners are discontinuous within or between each section, or if there is some kind of obstacle near the hook fasteners, it is desirable to actively use the double lanyard.

[0047] The basic technical configuration and operating procedure of the fall prevention method for preventing worker falls and accidents using the double lanyard in the present invention, which employs the aforementioned technical configuration, will be explained with reference to Figure 4. That is, a first lanyard-on-yard main body 1 is provided with a first hook body 3 including a first hook portion 11 having a curved shape that can be locked to the hook fastener 10 at one end 2 of the lanyard portion, and a second lanyard-on-yard main body 1' is provided with a second hook body 3' including a second hook portion 11' having a curved shape that can be locked to the hook fastener 10 at one end 2' of another lanyard portion, and these lanyard body parts 1, 1' are used simultaneously, and a harness, waist belt, etc. are attached to a part of the body of the worker 300. A method for preventing workers from falling in high-altitude work areas, which is used by securing the worker via an appropriate connecting member (not shown) such as a chest belt or waist belt, wherein both the first and second hook body parts 3, 3' are provided with first and second internal space area opening / closing means 13, 13' for introducing the hook locking device 10 into the internal space area 12, 12' of the hook part 11, 11' or for discharging it to the outside, and furthermore, each of the internal space area opening / closing means 13, 13' is used to secure the worker 300 Based on the worker's will, the internal space area opening means 13, 13' is configured to have an operating function that allows it to be controlled to either an open state or a closed state, and both of the internal space area opening / closing means 13, 13' are regardless of the worker's will, in response to a command signal based on the judgment of the site manager 200, and the operating function is controlled by a locking mechanism 16, 16' connected to the internal space area opening / closing means 13, 13' to restrict the opening and closing operation of the internal space area opening / closing means. A method for preventing workers from falling in a work area at height using a double lanyard configured to be controlled to a state (a safety management mode state, that is, a state in which the opening and closing operation of the locking mechanisms 16, 16' is controlled by the supervisor 200), comprising: a step (30) in which the worker 300 wearing the lanyards 1, 1' and the supervisor 200 hold a preliminary meeting regarding the work content or the conditions of the work area before the start of the required work; and a step (31) in which the supervisor instructs the worker 300 to enter the safety area 500.

[0048] Step 32: The supervisor 200 instructs the worker 300 to lock the first hook portion 11 and the second hook portion 11' of both the first hook body and the second hook body to the hook locking device 10 that is stretched within the safety area 500. Step 33: The supervisor 200 confirms that the worker 300 has locked both hook portions 11 and 11', and then sets the locking mechanism 16 and 16' to the safety management mode state (in particular, the initial setting state). Step 34: The worker 300 is instructed to move into the designated work area and to lock both hook parts 11, 11' to the hook locking device 10' within the work area. If the hook locking devices 10, 10' are in a continuous state before, during, or after the move, the worker 300 moves from the safety area 500 into the work area 501 while sliding both hook parts 11, 11' along the hook locking devices 10, 10', or if the hook locking devices 10, 10' are in a discontinuous state, the worker 300 first moves the two hook body parts 3,By operating the internal space opening / closing means 13 or 13' of one of the hook body parts (first hook body part) 3 or 3' which is in an operable state in 3', the first hook part 11 or 11' is removed from the hook locking device 10 in the safety area 500 and locked to the hook locking device 10' in the work area 501. At the same time, the first hook body part 3 or 3' is set to be inoperable, and as a result, the other hook body part (second hook body part) 3' or 3 is set to be operable by the worker 300, and thus it becomes newly operable. The worker 300 operates the internal space opening / closing means 13' or 13 in the second hook body 3' or 3 to remove the other hook body (second hook body) 3' or 3 from the hook locking device 10 in the safety area 500 and lock it to the hook locking device 10' in the work area 501 (at which point the second hook body 3' is set to be inoperable). After the worker 300 completes the predetermined hook locking operation in the work area 501, the worker notifies the supervisor 200 of the result (step 35),

[0049] Step 36: The supervisor 200, after confirming the completion of the locking, instructs the worker 300 to perform the prescribed work within the work area (when such instruction is given, the safety management mode returns to the initial setting state (first mode)); Step 37: The worker 300 performs the work and, after the completion of the work, notifies the supervisor 200 of the completion result of the work; After the completion of the work, the worker 300 slides both hook bodies 3, 3' through the respective hook locking devices 10, 10', or, if the respective hook locking devices 10, 10' are in a discontinuous state, performs the same operation as described above, to lock both hook bodies 3, 3' to the hook locking device 10 within the safety area 500, and then locks them within the safety area The method for preventing workers from falling from a work area at height consists of the following steps: returning to area 500 and reporting to the supervisor 200 that the worker has returned to the safety area 500 (step 38); confirming these facts and instructing the worker 300 to remove both hook parts from the hook fastener 10 within the safety area 500 (step 39) (at this stage, the safety management mode state has returned to its initial state, and both hook bodies 3 and 3' have returned to an operational state); and after the supervisor 200 confirms that both hook bodies 3 and 3' have been removed, deactivating the safety management mode state and instructing the worker 300 to leave the safety area 500 (step 40), after which the process ends.

[0050] On the other hand, in this specific example, another specific example of a method for preventing workers from falling from the elevated work area using the double lanyard is that when there are two or more work areas, if a predetermined task is completed in the first work area 501, the worker 300 does not return to the safety area 500 but moves directly to the second work area 502 to perform another predetermined task. As a specific example of the operating procedure in such a case, in step 41, it is determined whether the work area in which the predetermined work has now been completed is the last work area. If YES, that is, if work area 501 is the last work area, the process proceeds to step 38, and each subsequent step is executed, ending the process. On the other hand, if NO in step 41, it means that there is another work area, so in step 42, the number of work areas N is reduced by one and the calculation N-1 is performed (after changing N=N-1), in step 43, the worker 300 is moved and the hook fasteners 10" of each hook body 3,3' are switched to the new work area, and in step 44, the worker 300 is instructed to start the predetermined work in the new work area 502 (at this stage, the process proceeds to step 45 and returns to step 37).

[0051] In other words, if there are multiple (N) work areas, first, in step 41, the calculation N-1 is performed to determine whether N=0 or not. If N=0, it is determined that there are no other work areas, and the process proceeds to step 38, where the worker 300 returns to the safety area 500. On the other hand, if there are multiple work areas (N), for example three, then at the completion of the first work, N-1 will not be 0, and the existence of another work area 502 will be confirmed. Therefore, the value (N) is changed to (N-1) (N→N-1), and the system moves to the new work area and the same operations as described above are repeated. Specifically, in step 41, it is determined whether N=0 or not. If it is YES, each of the steps from step 38 to step 40 described above is executed, and the process ends. On the other hand, if it is NO in step 41, in step 42, (N) is changed to (N-1), and each of the steps from step 43 to step 45 described above is executed, and the process returns to step 37, and each of the steps from step 37 onward is repeated, and the process ends. Specifically, if a further work area (second work area) 502 exists, a step (step 43) is performed to instruct the first and second hook parts 3, 3', which are currently locked to the hook locking device 10' in the first work area 501, to be locked to the hook locking device 10'' in the second work area 502. (At this stage, the safety management mode state has returned to its initial setting state, and both hook body parts 3, 3' have returned to an operable state.) The general procedure for step 43 is as follows: That is, if the hook fasteners 10' and 10'' in the first work area 501 and the second work area 502 are in a continuous state, the worker 300 moves both hook portions 11 and 11' by sliding them from the hook fastener 10' in the first work area 501 to the hook fastener 10'' in the second work area 502, or the first work area If the hook fasteners 10' and 10'' in area 501 and the second work area 502 are in a discontinuous state, the worker 300 first operates the internal space area opening / closing means 13 or 13' of one of the two hook body parts 3, 3' that is in an operable state (first hook body part) 3 or 3' to fasten the hook fasteners in the first work area 501. By removing the first hook portion 11 or 11' from the tool 10' and engaging it with the hook locking device 10'' in the second work area 502, the first hook body portion 3 or 3' is disabled. As a result, the other hook body portion (second hook body portion) 3' or 3 is made operable by the worker 300. This allows the newly operable second hook body portion 3' or 3 to open and close its internal space. The worker 300 operates the chain mechanism 13' or 13 to detach the other hook body (second hook body) 3' or 3 from the hook locking device 10' in the first work area 501 and lock it to the hook locking device 10'' in the second work area 502. (At this point, the second hook body 3' is temporarily set to be inoperable, but afterwards, both hook bodies 3, 3' become operable by the worker 300.)

[0052] Subsequently, after the supervisor 200 confirms that the worker 300 has moved and that each hook portion 11, 11' is secured to the hook locking device 10" in the second work area, the supervisor instructs the worker to perform the prescribed work within the second work area 502 (step 44) (at this stage, the safety management mode state returns to its initial setting state, and both hook portions 11, 11' are back to an operable state). Step 45 adds a step of returning to step 37 and notifying the worker that they have completed the work, and the subsequent steps are repeated. Figure 4 shows a flowchart summarizing the specific examples of the methods described above for preventing workers from falling from the elevated work area using a double lanyard. In other words, basically, each step from step 30 to step 37 in the diagram is executed sequentially, and in step 37, when a notification is sent to the supervisor 200 that the worker 300 has completed the prescribed work in the first work area 501, it is determined whether the work area where the prescribed work has just been completed is the last work area. In other words, if there are multiple (N) work areas, first, the calculation N-1 is performed to determine whether N=0 or not. If N=0, it is determined that there are no other work areas, and the process proceeds to step 38, and the worker 300 returns to the safety area 500.

[0053] Next, as described above in the present invention, when the locking mechanisms 16 and 16' that control the opening and closing operations of the first internal space area opening / closing means 13 and the second internal space area opening / closing means 13' are set to the safety management mode state, a specific example of the state changes and operation procedures of the first hook body 3 and the second hook body 3' individually when the locking mechanisms 16 and 16' that control the opening and closing operations of the first internal space area opening / closing means 13' are set to the safety management mode state will be explained in detail below with reference to the flowchart in Figure 8 and the reference diagram in Figure 9. Specifically, as shown in Figure 8, first, after starting, in step 1 (ST1), the worker 300 is allowed to enter the safety area 500, then in step 2 (ST2), the first locking mechanism 16 and the second locking mechanism 16' are set to their initial state in the safety management mode state (that is, both the first locking mechanism 16 and the second locking mechanism 16' are set so that the worker 300 can operate them, but at the same time, they are set so that the hook bodies of both cannot be operated), and in step 3 (ST3), the first hook body An instruction is given to lock each of the hook body parts 3 and the second hook body part 3' to the hook locking device 10 in the safety area 500. In step 4 (ST4), it is determined whether the first hook body part 3 or the second hook body part 3', which was arbitrarily selected by the worker 300, was used. If YES, the process proceeds to step 5 (ST5), where the selected hook body part 3 or 3' is operated by the worker 300, and the hook part 11 or 11' of the hook body part 3 or 3' is locked to the hook locking device 10 in the safety area 500. (By this operation, the hook body part 3 or 3' is set to be inoperable, and the other hook body part 3' or 3 is set to be operable instead.)

[0054] Subsequently, the process proceeds to step 6 (ST6), where it is determined whether the hook body 3' or 3, which is set to be operable at this point, has been operated. If the answer is YES, the process proceeds to step 7 (ST7), where the hook portion 11' or 11 of the hook body 3' or 3 is locked to the hook locking device 10 within the safety area 500. (By performing this operation, the first hook body 3' is set to be inoperable, and at the same time, the hook body 3 is reset to be operable.) Subsequently, in step 8 (ST8), after confirming that both hook portions 3 and 3' are engaged with the hook locking device 10, the process proceeds to step 9 (ST9), in which the worker 300 is instructed to move from the safety area 500 to the work area 501 (the initial work area N). In step 10 (ST10), the safety management mode is reset to its initial state, and at the same time, the worker 300 begins to move to the work area 501. Subsequently, the process proceeds to step 11 (ST11), in which the re-attachment operation of each hook portion 11 and 11' is initiated. At this point, it is determined whether the hook body portion 3 or 3', which is set to be operable, has been operated. If the answer is YES, the process proceeds to step 12 (ST12), in which, while the worker 300 is moving, the hook portion 11 or 11' of the hook body portion 3 or 3' is removed from the hook fastener 10 in the safety area 500 and fastened to the hook fastener 10' in the work area 500. (As a result of this operation, the hook body 3 or 3' is set to be inoperable, as described above, and the other hook body 3' or 3 is set to be operable instead.) Next, the process proceeds to step 13 (ST13), where it is determined whether another hook body 3' or 3, which is set to be operable at this point, has been operated. If the answer is YES, the process proceeds to step 14 (ST14), where, while the worker 300 is moving, the hook portion 11' or 11 of the hook body 3' or 3 is detached from the hook locking device 10 in the safety area 500 and locked to the hook locking device 10' in the work area 501. (By performing this operation, the hook body portion 3' or 3 is set to be inoperable, and instead the other hook body portion 3 or 3' is set to be operable.) Furthermore, if the result of the judgment in each of the above steps 4 (ST4), 6 (ST6), 11 (ST11), and 13 (ST13) is NO, the respective judgment operation will be repeated in each case.

[0055] Subsequently, in step 15 (ST15), the worker 300 is instructed to perform a predetermined task within the work area 501, and in step 16 (ST16), an operation is performed to return the safety management mode to its initial state. Subsequently, in step 17 (ST17), the supervisor 200 is notified that the worker 300 has completed the prescribed work within the work area 501. Then, the process proceeds to step 18 (ST18), instructing the worker 300 to return to the safety area 500. (At this point, the safety management mode is maintained in its initial default state.) Subsequently, in step 19 (ST19), the supervisor 200 confirms that the worker 200 has returned to the safety area 500, then disables the safety management mode, and instructs the worker 300 to detach both hook bodies 3,3' from the hook fasteners 10 in the safety area 500 and leave the safety area, and the process ends.

[0056] Next, in a specific example using the double lanyard in the present invention, an example of the operation procedure for the safety management mode described above when there are multiple work areas (at least two of which are N) will be explained below. In other words, in step 20 (ST20) of Figure 8, it is determined whether the current work area 501 (N) is the last work area (N=0). If YES, the process proceeds directly to step 18 (ST18), then through step 19 (ST19), and finally to END. On the other hand, if the answer in step 20 (ST20) is NO, then in step 21 (ST21) (N) is changed to (N-1), and the process proceeds to step 22 (ST22), where the worker 300 is instructed to move to the new work area (N-1), and in step 23 (ST23) the safety management mode state is reset to the initial state.

[0057] Subsequently, the process proceeds to step 24 (ST24), where it is determined whether one of the hook body parts 3 or 3', which is set to be operable at this point, has been operated. If the answer is YES, the process proceeds to step 25 (ST25), where, during the worker 300's movement, the hook portion 11 or 11' of the hook body part 3 or 3' is removed from the hook fastener 10' in the current work area 501 and fastened to the hook fastener 10'' in the other (new) work area 502. (As a result of this operation, one of the hook body parts 3 or 3' is set to be inoperable, as described above, and the other hook body part 3' or 3 is set to be operable instead.) Next, the process proceeds to step 26 (ST26), where it is determined whether the other hook body 3' or 3 that is set to be operable at this point has been operated. If the answer is YES, the process proceeds to step 27 (ST27), where, while the worker 300 is moving, the hook portion 11' or 11 of the hook body 3' or 3 is detached from the hook locking device 10' in the current work area 501 and locked to the hook locking device 10'' in the other (new) work area 502. (By performing this operation, the hook body portion 3' or 3 is set to be inoperable, and instead the other hook body portion 3 or 3' is set to be operable.) Subsequently, in step 28 (ST28), the worker 300, after completing the move, is instructed to perform the prescribed work in the new work area (N) 502, and in step 29 (ST29), the safety management mode is reset to its initial default state. Subsequently, in step 30 (ST30), the worker 300 notifies the supervisor 200 that the predetermined work in the subsequent work area (N) 502 has been completed, and then the process returns to step 20 (ST20) and the subsequent steps are executed. Furthermore, in each of the steps described above, if the answer is NO in step 24 (ST24) and step 26 (ST26), the operation of that step is repeated. [Explanation of symbols]

[0058] 1... Lanyard main body 2…One end of the lanyard 3, 3'...Hook body 4,4'... One end of the lanyard body 5...Carabiner part 6,6'...Connecting ring section 7…Energy absorption section 8… Connecting ring section 9...Lanyard, central part of the main body 10, 10', 10"... Hook fasteners 11, 11'... Hook part 12, 12'... Inside the internal space region of the hook section 13, 13'...Inner space area opening / closing means 14…Pressure-sensitive keys 15...Opening / closing valve section 16, 16'... Locking mechanism 17...Engagement state sensing sensor unit 18…Material information acquisition sensor unit 19…Means of notification 20… Surveillance cameras, location sensors, motion capture, etc. 100... Worker fall prevention system 161... Drive stop device 162...Control Unit (CTR) 163...Battery section 200...Manager 300...workers 400…External Management and Supervision Center 401...Monitor Department 402...Storage means section 403…Calculation means (CPU) 404…Information sending / receiving means information 500... Starting area (safe zone) 501, 502, 503…Work Area

Claims

1. A fall prevention system for workers in high-altitude work areas, in which at least one lanyard body is provided, each having a hook body with a curved shape that can be attached to a hook fastener (hereinafter simply referred to as a hook fastener) made of an appropriate lifeline or handrail, is fixed to a part of the worker's body via an appropriate connecting member such as a harness, chest belt or waist belt, and in addition to the curved hook portion, the hook body either introduces the hook fastener into the internal space of the hook portion or brings the hook fastener out from the internal space. A fall prevention system for workers in high-altitude work areas, characterized in that, in order to discharge waste, an internal space area opening / closing means is provided for opening or closing the internal space area, and the internal space area opening / closing means is configured to have an operating function that allows the worker to control the operation of the internal space area opening / closing means to either an open state or a closed state based on the worker's will, and the internal space area opening / closing means is configured to block the operation of the internal space area opening / closing means regardless of the worker's will in response to a command signal based on the judgment of the site manager / supervisor.

2. The worker fall prevention system for high-altitude work areas according to claim 1, characterized in that the internal space area opening / closing means is further provided with a locking mechanism for receiving the control signal from the outside and restricting (blocking) the opening and closing operation of the internal space area opening / closing means based on the external control signal.

3. The worker fall prevention system in a high-altitude work area according to claim 2, characterized in that the external signal is transmitted to the outside from a designated supervisor located in a remote supervisory center separate from the designated work area where the worker is located, as needed.

4. The worker fall prevention system according to claim 1, characterized in that the lanyard body is a double lanyard.

5. The worker fall prevention system according to claim 4, characterized in that the double lanyard is provided with a first hook body and a second hook body, each of the hook body being provided with an internal space opening / closing means for opening or closing the internal space area in addition to the curved hook portion, and further, the internal space opening / closing means is configured to have an operating function that allows the worker to control the internal space opening means to either an open state or a closed state based on the worker's will, and the internal space opening / closing means in both or either of the first hook body and the second hook body is configured to block the operating function of the internal space opening / closing means regardless of the worker's will in response to a command signal based on the judgment of the site manager / supervisor.

6. A worker fall prevention system for work areas at height according to claim 5, characterized in that the internal space area opening / closing means in the first hook body and the second hook body are further provided with a locking mechanism for receiving the external control signal and restricting the opening and closing operation of the internal space area opening / closing means based on the external control signal.

7. The system for preventing worker falls in high-altitude work areas, according to claim 6, is configured such that when the locking mechanism is set to an operational state, in the initial setup stage, the internal space area opening / closing means of either the first hook body or the second hook body are set to an operational state, and when the worker operates either the first hook body or the second hook body, the internal space area opening / closing means of the operated hook body is subsequently set to a deactivated state, and at the same time, the internal space area opening / closing means of the other hook body is set to an operational state, but the internal space area opening / closing means of either the first hook body or the second hook body are set to a state in which the worker cannot operate them simultaneously.

8. A worker fall prevention system for working at heights according to claim 1, characterized in that a part of the curved hook portion, preferably near the portion that directly contacts the hook fastener, is provided with an engagement state sensing sensor portion that senses the engagement state between the hook portion and the hook fastener, and / or an appropriate material information acquisition sensor portion that can detect and acquire information such as the material or strength of the hook fastener that is engaged with the hook portion.

9. The worker fall prevention system in a high-altitude work area according to claim 18, characterized in that the engagement state sensing sensor unit and / or the material information acquisition sensor unit include a transmission function and / or a notification function for transmitting the detection result information to the outside.

10. A fall prevention system for workers in high-altitude work areas, in which one or more (preferably two) lanyard bodies, each having a hook body with a curved shape that can be attached to a hook fastener (hereinafter simply referred to as a hook fastener) consisting of an appropriate lifeline or handrail at at least one end of the lanyard body, are fixed to a part of the worker's body via appropriate connecting members such as a harness, chest belt, waist belt, or hip belt, wherein the hook body is provided with an internal space area opening / closing means for opening or closing the internal space area in order to introduce the hook fastener into the internal space area or to discharge the hook fastener from the internal space area to the outside, and furthermore, the internal space area opening / closing means can be opened based on the worker's will. A method for preventing workers from falling from a work area at height, using a lanyard that has an operating function that allows it to be controlled to either an open state or a closed state, and the means for opening and closing the internal space area is configured such that, in response to a command signal based on the judgment of the site manager, the operating function of the means for opening and closing the internal space area is blocked by a locking mechanism connected to the means for opening and closing the internal space area, regardless of the worker's will, and the method is characterized in that, after the worker wearing the lanyard enters the safety area and the hook portion of the hook body is secured to a locking device in the safety area, the operating authority for the means for opening and closing the internal space area of ​​the hook body is controlled by the worker's manager or supervisor during the period from when the worker leaves the safety area, through the work area, and returns to the safety area.

11. The process involves the worker wearing the lanyard and the supervisor conducting a preliminary meeting regarding the work content or the condition of the work area before commencing the required work; the supervisor instructing the worker to enter the safety area; the supervisor confirming that the worker has entered the safety area and setting the locking mechanism 16 to a non-operational state (OFF); the supervisor instructing the worker to attach the hook to the hook fastener in the safety area; the supervisor confirming that the hook is attached to the hook fastener in the safety area and instructing the worker to move to the designated work area; the worker removing the hook from the hook fastener in the safety area, moving to the work area, and attaching the hook to the hook fastener in the work area before, during, or after the move; and the worker completing the move to the work area and placing the hook in the work area. A method for preventing workers from falling from a high-altitude work area, as described in claim 10, characterized by comprising the steps of: notifying the supervisor that the hook has been secured to the hook fastener; the supervisor, upon receiving the notification, confirming the completion of the movement and the secured state of the hook, setting the lock mechanism to the operational state (ON) and instructing the worker to perform the predetermined work; the worker notifying the supervisor that the predetermined work has been completed within the predetermined work area, and subsequently notifying the supervisor that the worker has moved into the safety area; the supervisor, after confirming that the worker has returned to the safety area, setting the lock mechanism to the inactive state (OFF) and instructing the worker to remove the hook from the hook fastener within the safety area; and the supervisor, after confirming that the worker has removed the hook, instructing the worker to leave the safety area.

12. A double lanyard is used, which simultaneously uses a first lanyard-on-yard body, which has a first hook body, including a curved shape that can be attached to the hook fastener, at one end of the lanyard, and a second lanyard-on-yard body, which has a second hook body, including a curved shape that can be attached to the hook fastener, at one end of the other lanyard, and each lanyard body is fixed to a part of the worker's body via appropriate connecting members such as a harness, waist belt, chest belt, or hip belt. A method for preventing workers from falling in high-altitude work areas, wherein both the first and second hook body portions are provided with, in addition to the hook portion, first and second internal space area opening / closing means for introducing the hook locking device into the internal space area of ​​the hook portion or discharging it to the outside, and furthermore, each of the internal space area opening / closing means is configured to have an operating function that allows the worker to control the internal space area opening means to either an open state or a closed state, and the internal space area opening / closing means The method for preventing workers from falling in high-altitude work areas is a double lanyard configured such that, in response to a command signal based on the judgment of the on-site supervisor, the operation function of the internal space opening / closing mechanism is blocked (deactivated) by a locking mechanism connected to the internal space opening / closing mechanism, regardless of the worker's will, and the method involves the worker wearing the lanyard and the supervisor conducting a preliminary meeting before the start of the work to discuss the work content or the conditions of the work area, and the worker... The process involves instructing the worker to enter the safety area, the supervisor confirming that the worker has entered the safety area, setting the safety management mode to its initial state, the supervisor instructing the worker to attach the first hook portion and the second hook portion of both the first hook body and the second hook body to the hook fastener installed within the safety area, and the supervisor confirming that both hook portions have been attached to the hook fastener, and then instructing the worker:The process involves instructing the worker to move into the designated work area and perform the designated work; the worker moving from the safety area to the work area while sliding both hook portions along the hook locking device before, during, or after the move; or the worker first operating the internal space opening / closing mechanism of one of the two hook portions (the first hook portion) to detach the first hook portion from the hook locking device in the safety area, and simultaneously locking it to the hook locking device in the work area while setting the first hook portion to be inoperable; and as a result, the other hook portion (the second hook portion) is set to be operable by the worker, and the worker operates the internal space opening / closing mechanism of the newly operable second hook portion to open the two hooks A method for preventing workers from falling from a work area at height comprises the steps of: removing the other hook body (second hook body) from the hook locking device in the safety area and locking it to the hook locking device in the work area, while simultaneously setting the second hook body to be inoperable; the worker performing a predetermined task in the work area and reporting the completion of the task to the supervisor; the worker notifying the supervisor that they have returned to the safety area after completing the task; the supervisor confirming that the worker has returned to the safety area and instructing the worker to remove both hook parts from the hook locking device in the safety area; and, after confirmation by the supervisor, releasing the safety management mode, confirming that the worker has removed both hook parts from the hook locking device 10, and instructing the worker to leave the safety area.

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