Safety belt use situation management system

Abstract

To provide a safety belt use situation management system capable of managing whether or not procedures in which a hook of a safety belt is replaced is appropriate.SOLUTION: A safety belt use situation management system 100 comprises: a third monitoring part 350 for monitoring whether or not an operator A moves to a travel direction side by a predetermined distance equal to or longer than the length of a rope 12 from a support 22 beyond the support 22; a third confirmation part 460 for confirming whether or not both two hooks 13A, 13B of a safety belt 10 attached to the operator A whose movement is detected, are hooked to a main rope 30B on the travel direction side; and a warning part 500 for giving a warning, when it is confirmed by the third confirmation part 460 that at least one of the two hooks 13A, 13B is not hooked to the main rope 30B on the travel direction side.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a safety belt use status management system. [Background technology]

[0002] Workers who work at heights wear a safety belt, which is a fall prevention device, and attach the hook of the safety belt to a lifeline while working to prevent falls. Workers move around the work site while working, and when they do so, they change the hook of the safety belt. This kind of hook change needs to be done properly, but it is a task that is performed frequently, and it is difficult for managers to constantly manage it.

[0003] In order to reduce the management burden on managers, technology has been proposed to check the use status of safety belts by incorporating switches and cameras into the hooks of the safety belts (see, for example, Patent Documents 1 and 2).

[0004] Also, a technology has been proposed to monitor the use of safety belt hooks from on-site images taken at a work site. For example, Patent Document 3 describes a technology in which the safety belt hook and the life rope or handrail are each colored differently over their entirety, and when the color image of the hook intersects with the color image of the life rope or handrail, it is determined that the hook is in use. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6409748 [Patent Document 2] Patent No. 6505555 [Patent Document 3] Patent Publication No. 2021-129953 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the above Patent Documents 1 to 3 do not mention managing whether the procedure for changing the hook of the safety belt is appropriate when, for example, a worker moves along a life rope, reaches the position of a support that supports the life rope, and then moves beyond this support. Specifically, there is no mention of managing whether the procedure is followed, in which the safety belt is equipped with two hooks, one hook is left on the life rope on the rear side in the traveling direction, the other hook is removed and replaced with the life rope on the front side in the traveling direction, and then the hook on the rear life rope is removed and replaced with the life rope on the front side in the traveling direction.

[0007] In view of the above, an object of the present invention is to provide a safety belt use status management system and method capable of managing whether the procedure for changing the hook of a safety belt is appropriate. [Means for solving the problem]

[0008] The safety belt usage status management system of the present invention includes an image acquisition unit that acquires a site image of a site where a worker is working, a worker position identification unit that identifies the position of the worker from the site image, a hook position identification unit that identifies the positions of two hooks attached via ropes to the belt of a safety belt worn by the worker from the site image, a support position identification unit that identifies the positions of a plurality of supports from the site image, a lifeline path identification unit that identifies the path of a lifeline stretched between the supports based on the identified positions of the supports from the site image, and a link between the positions of the hooks and the path of the lifeline. the hook-up determination unit determining whether the hook is caught on the main rope based on the positional relationship between the hook and the support; a first monitoring unit monitoring whether the worker has moved beyond the support body a predetermined distance in the direction of travel that is greater than or equal to the length of the rope; a first confirmation unit confirming whether the two hooks on the safety belt worn by the worker who has detected the movement are both caught on the main rope on the direction of travel; and a warning unit issuing a warning when the first confirmation unit confirms that at least one of the two hooks is not caught on the main rope on the direction of travel.

[0009] The method for managing the use of a safety belt according to the present invention includes the steps of: acquiring a site image of a site where a worker is working; identifying the position of the worker from the site image; identifying the positions of two hooks attached to the belt of a safety belt worn by the worker via a rope from the site image; identifying the positions of a plurality of supports from the site image; identifying a path of a life rope stretched between the supports based on the identified positions of the supports from the site image; determining whether the hook is caught on the life rope from the positional relationship between the position of the hook and the path of the life rope; monitoring whether the worker has moved beyond the support and a predetermined distance from the support to the traveling direction side that is equal to or greater than the length of the rope; confirming whether the two hooks attached to the safety belt worn by the worker who has detected the movement are both caught on the life rope on the traveling direction side; and issuing a warning when it is confirmed that at least one of the two hooks is not caught on the life rope on the traveling direction side.

[0010] According to the safety belt usage status management system and method of the present invention, if a worker performs inappropriate behavior such as moving a predetermined distance in the direction of travel from the support body in a state where at least one of the two hooks is not caught on the main rope in the direction of travel, a warning can be issued to alert the worker.

[0011] In the safety belt usage status management system of the present invention, it is preferable that a second monitoring unit is provided which monitors whether or not the worker is present within a first specified range that is equal to or greater than the specified distance from the support body, and the first monitoring unit monitors the worker being monitored by the second monitoring unit.

[0012] In this case, since the workers monitored by the first monitoring unit can be limited to the workers monitored by the second monitoring unit, it is possible to limit the workers monitored by the first monitoring unit.

[0013] Furthermore, in the safety belt usage status management system of the present invention, it is preferable to have a third monitoring unit that monitors whether the worker is present within a second predetermined range less than the predetermined distance from the support for more than a predetermined time, and the warning unit issues a warning when the first hooking confirmation unit confirms that both of the two hooks are hooked on the main rope on the traveling direction side within the second predetermined range within a time less than the predetermined time.

[0014] In this case, if something happens that would not happen as long as the operator acts normally, such as the first hooking confirmation unit confirming that both hooks are hooked onto the main rope in the direction of travel within a time that is less than a specified time within a second specified range, an alarm can be issued to draw attention to the fact that a false detection has occurred. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic diagram of a construction site managed by a safety belt use status management system according to an embodiment of the present invention. [Diagram 2] Block diagram of a safety belt usage status management system. [Diagram 3] 4 is a flowchart showing a safety belt use status management method processed by a specifying unit according to an embodiment of the present invention. [Figure 4] 4 is a flowchart showing a safety belt use status management method processed by a change monitoring unit according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] A safety belt usage status management system 100 according to an embodiment of the present invention will be described. The safety belt usage status management system 100 is a system for managing the usage status of a safety belt, which is a fall prevention device worn by a worker performing work at height.

[0017] First, a construction site managed by the safety belt use status management system 100 will be described with reference to Fig. 1. This construction site is a site where workers A work at height, and each worker A wears a safety belt 10.

[0018] The safety belt 10 includes a belt 11 for wearing on the human body, two ropes 12A, 12B connected to one end of the belt 11 on the back as a lifeline, and hooks 13A, 13B connected to the other end of each of the ropes 12A, 12B. In this way, the safety belt 10 has two sets of ropes 12A, 12B and hooks 13A, 13B, and by always hanging at least one of the hooks 13 on a lifeline 30 hung between posts 20 or the like, the worker A is prevented from falling or falling. In the following, the ropes 12A, 12B are collectively referred to as the rope 12, and the hooks 13A, 13B are collectively referred to as the hooks 13. The post 20 is fixed to the building frame or a temporary scaffolding, and is configured to be able to support the load on the lifeline 30 when the worker A falls.

[0019] The safety belt 10 preferably includes a full harness type belt 11 that holds the entire body by passing the belt around the thighs, shoulders, etc., in addition to the waist belt. In the case of a full harness type, it is recommended that the hook 13 be hooked onto the shoulder belt and positioned around the chest when not working at height.

[0020] The life rope 30 is usually stretched between the two posts 20 so that it is positioned at a predetermined height, about the waist of the worker A. The life rope 30 is made of a rope 32 with hooks 31 attached to both ends. It is preferable to use a tensioner (not shown) to reduce the slack in the life rope 30 stretched across the posts 20.

[0021] The pillar 20 comprises a pillar body 21 extending in the vertical direction, and a ring-shaped retaining metal fitting 22 provided at the upper end of the pillar body 21 for hanging the hook portion of the life rope 20. Although not shown, the lower end of the pillar body 21 is attached to a flange portion of a steel frame constituting the framework of a building or temporary scaffolding, using a vice-like fixing jig or the like.

[0022] Although not shown, the main rope 30 may be configured so that the hook portion 31 can be hooked onto a retaining bracket provided on the steel frame of a building or temporary scaffolding, for example, by using an H-shaped steel steel clamp or a single-tube pipe clamp having a ring-shaped retaining bracket.

[0023] In this way, the hook portions 31 on both ends of the life rope 30 are supported by the retaining fittings 22 of the support pole 20 and by retaining fittings (not shown) provided on the clamps of the temporary scaffolding. These retaining fittings 22 correspond to the support body and supporting part of the present invention. Below, we will explain the case where the hook portion 31 of the life rope 30 is supported by the retaining fittings 22 provided on the top of the support pole 20, and the retaining fittings 22 will also be called the support body 22.

[0024] Here, the identification part 40 is provided on the upper part of the support 22. The identification part 40 is a part that allows the identification part 40 to be easily recognized from other parts in an image captured at the site. The identification part 40 is, for example, a colored part of the support 22, or a part having a color different from the support 22 and installed on the upper part of the support 22. It is preferable that the identification part 40 is colored in a color such as a fluorescent color that is not often used for materials used at the site, or is made of a magnet, sticker, ribbon, etc. of a fluorescent color that is easy to attach and detach. The identification part 40 may be provided on other parts of the support 20, such as the lower part or end part of the support 22, and further the identification part 40 may be provided on a part of the upper part of the support body 21.

[0025] Furthermore, the identification section 40 may be provided at a portion located at a position a predetermined distance away from the support 22 in a predetermined direction. In this case, the portion in question is preferably located at a position that allows identification of the path of the life rope 30 when the life rope 30 is hung between the posts 20. For example, the identification section 40 may be provided by providing a rod-shaped member or the like on the upper part of the support 22 and arranging a flag or the like at a position on this member a predetermined distance away from the support 22, or the identification section 40 may be provided by coloring a predetermined portion. The identification section 40 may also be provided on a steel frame a predetermined distance away from the clamp.

[0026] Furthermore, the identification portion 40 may be provided on the hook portion 31 of the life rope 30 supported by the support body 22. Also, the identification portion 40 may be provided on a portion of the rope 32 that is a predetermined distance away from the hook portion 31 of the life rope 30.

[0027] It is preferable that the positional relationship of the identification unit 40 with respect to the support 22 is the same at sites where the same imaging device 50 is used to capture images. When the positional relationship in which the identification unit 40 is provided is different, it is preferable that the color or shape of the identification unit 40 is different depending on the positional relationship in which the identification unit 40 is provided. For example, it is preferable that the identification unit 40 provided on the support 22 and the identification unit 40 provided on the clamp are different in color, such as yellow fluorescent color and orange fluorescent color, or rectangular shape and triangular shape. It is to be noted that in this specification, the positional relationship and position may also include the meaning of direction.

[0028] At the work site, an imaging device 50 is installed to capture images of the work site where work at height is performed. It is preferable to provide multiple imaging devices 50 such as cameras or video cameras and capture images of the work site from multiple directions, thereby making it possible to obtain the three-dimensional position of the imaging target. Also, a three-dimensional camera or three-dimensional video camera capable of obtaining the three-dimensional position of the imaging target may be used.

[0029] 2, the safety belt use status management system 100 manages the use status of the safety belt 10 by using a site image captured by an imaging device 50 and transmitted via a network N. The network N may be either wired or wireless, and may be any type of communication network such as the Internet, a LAN (Local Area Network), or a VPN (Virtual Private Network).

[0030] The safety belt usage status management system 100 is composed of a computer such as a PC computer, which is realized by a CPU (Central Processing Unit) or MPU (Micro Processing Unit) executing a program stored in an internal storage device using RAM as a working area.

[0031] The safety belt use status management system 100 includes an image acquisition unit 200, an identification unit 300, a replacement monitoring unit 400, and a warning unit 500. The processing in these units may be performed using AI.

[0032] The image acquisition unit 200 acquires, via the network N, site images captured by the imaging device 50 of the site where a worker A wearing a safety belt 10 is working.

[0033] The identification unit 300 identifies or estimates the positions of the worker A, hook 13, support body 22, main rope 30, etc., based on the on-site images acquired by the image acquisition unit 200. The identification unit 300 includes a worker position identification unit 310, a hook position identification unit 320, a support body position identification unit 330, a main rope range setting unit 340, a main rope path identification unit 350, a virtual main rope estimation unit 360, and a hooking determination unit 370.

[0034] The worker position identification unit 310 identifies the worker A from the site image acquired by the image acquisition unit 200, and identifies the position of the worker A. The image of the worker A can be identified using existing image identification technology, but the worker A can be easily identified by focusing on the helmet and safety belt 10 worn by the worker A. When there are multiple workers A, each worker A is identified separately.

[0035] Note that worker A may be identified within the entire range shown in the site image captured of the work range at or above a predetermined height in the target work site, or worker A may be identified only within a predetermined range. When identifying the range in this way, the range for identifying worker A may be set based on the position of supports 22 identified by support position identifying unit 330. This is because, since the main rope 30 is stretched between supports 22, the work range where no supports 22 exist may, for example, already have a floor installed, and therefore it is considered that ensuring safety by the main rope 30 is not necessary.

[0036] However, in order to install the life rope 30 in a work area where there is a risk of falling or tripping, the support 22 is installed, and the identification part 40 is installed to easily and reliably identify the position of the support 22. Therefore, in a work area where the risk of the worker falling or tripping has disappeared as the work progresses and the life rope 30 is no longer necessary, it is preferable to remove the identification part 40 and then detach the life rope. However, in some cases, the identification part 40 and the life rope 30 may remain in an area where the life rope 30 is no longer necessary. Therefore, it is preferable for the administrator to check the setting of the range for identifying worker A.

[0037] Furthermore, even when working at a predetermined height or higher, there may be a work range where safety assurance using the safety belt 10 is not required depending on the installation conditions of the deck slab, formwork, etc. In such a case, the manager or the like may set the work range, and the worker A present within this work range may not be specified.

[0038] The hook position identifying unit 320 identifies the hook 13 provided on the safety belt 10 worn by the worker A identified by the worker position identifying unit 310 from the site image acquired by the image acquiring unit 200, and identifies the position of the hook 13. Existing image identification technology may be used for image identification of the hook 13, and since the hook 13 is large, identification is relatively easy. If the hook 13 is colored with a fluorescent color or the like, identification becomes even easier. Since the safety belt 10 worn by the worker A is equipped with two hooks 13, the positions of the two hooks 13A, 13B are identified for each identified worker A.

[0039] The support position identifying section 330 identifies the identification section 40 from the site image acquired by the image acquiring section 200, and identifies the position of the support 22 based on the identified position of the identification section 40. The support position identifying section 330 first identifies the image of the identification section 40 from the site image, and identifies the position of the identification section 40. The identification section 40 is colored or the like so that it can be easily identified by the image compared to other parts of the construction site. Therefore, it is possible to easily identify the image of the identification section 40 from the site image using existing image identification technology. Note that, when the hook 13 is colored, it is preferable to color the identification section 40 with a different color.

[0040] As described above, since the positional relationship between the identification portion 40 and the support 22 is known, the position of the support 22 can be identified from the identified position of the identification portion 40.

[0041] The lifeline range setting section 340 determines the range in which the lifeline 30 may exist based on the position of the support 22 identified by the support position identifying section 330 from the on-site image acquired by the image acquiring section 200.

[0042] The life rope 30 is stretched between adjacent supports 22. Based on the identified positions of the supports 22, the range in which the life rope 30 is estimated to be present so that it is stretched between the supports 22 is identified. By limiting it to this range, it is possible to simplify and speed up the work required for identification, compared to identifying an image of the life rope 30 from the entire site image. The life rope 30 is thin, and depending on weather conditions such as backlighting and the background image, it can be difficult to identify, but if it is within a specified range, it can be identified with high accuracy.

[0043] Here, the range in which the image of the master rope 30 can be identified is between the supports 22, but since the master rope 30 sags under its own weight, it is never located above the supports 22, but is located at the lowest point near the center of the adjacent supports 22, and is located slightly below the supports 22 in the parts close to the supports 22. Also, since the master rope 30 is stretched while being taut using a tensioner or the like, it does not bend significantly downward, and furthermore, it is straight when viewed from above. Therefore, the range in which the master rope 30 can exist can be estimated to be a predetermined narrow range.

[0044] The master rope path identifying section 350 determines the path of the master rope 30 within the range set by the master rope range setting section 340 from the site images acquired by the image acquiring section 200. Note that if the master rope range setting section 340 is not present, the master rope path identifying section 350 may directly identify the master rope 30 from the site images acquired by the image acquiring section 200 and determine the path of the master rope 30.

[0045] In addition, the rope 32 of the life rope 30 may be colored or otherwise provided with an identification section in a predetermined area, such as at both ends or in the center, and the route of the life rope 30 may be specified by identifying this identification section from an on-site image. However, when coloring the rope 32, it is preferable to color it a color different from that of the hook 13 and the support 22.

[0046] If the master rope path identification unit 350 is unable to identify the path of the master rope 30 within the range set by the master rope range setting unit 340, the virtual master rope position estimation unit 360 estimates the range of the path of the virtual master rope, assuming that the master rope 30 exists within the range.

[0047] As mentioned above, since the life rope 30 is difficult to distinguish from an on-site image, there are cases where the life rope 30 cannot be identified from an on-site image within the range set by the life rope range setting unit 340. However, the identification unit 40 is provided to indicate that the hook portion 31 of the life rope 30 is hooked on the support body 22 identified by this identification unit 40. Therefore, even if the life rope 30 cannot be identified from an on-site image, it is possible to presume that the hook portion 31 of the life rope 30 is hooked on the support body 22 identified by the identified identification unit 40.

[0048] Therefore, if the master rope 30 cannot be recognized within the range set by the master rope range setting unit 340, the master rope 30 is assumed to be stretched between adjacent supports 22, and the path of the virtual master rope is estimated. At this time, the master rope 30 is assumed to be stretched between adjacent supports 22 with a predetermined range of bending, and is estimated to exist within a predetermined range. Note that the range of bending may be changed depending on the spacing between the supports 22. The range set by the master rope range setting unit 340 may also be estimated as the range in which the path of the virtual master rope may exist.

[0049] In addition, the virtual main rope may be used not only when the main rope 30 stretched between the two supports 22 cannot be identified at all, but also when the main rope 30 cannot be partially identified, and a partial path of the virtual main rope may be estimated by assuming that the main rope 30 exists within a specified range connecting the identified main ropes 30.

[0050] The hooking determination unit 370 determines whether the hook 13 is hooked on the main rope 30 or virtual main rope from the positional relationship between the position of the main rope 30 or virtual main rope and the position of the hook 13. It may be determined that the hook 13 is hooked not only when it is definitely hooked, but also when there is some error in these positional relationships based on these positional relationships. This is because, for worker A wearing the safety belt 10, there is a large difference in height between the hook 13 and the main rope 30, except when the hook 13 of the safety belt 10 is hooked on the main rope 30 or is in the middle of being changed so as to be hooked.

[0051] Furthermore, even if the path of the main rope 30 cannot be identified from the on-site images, it is possible to determine whether the hook 13 is caught on the main rope 30 or not from the range of the virtual main rope path estimated by the virtual main rope estimation unit 360 and the positional relationship between the hook 13. This makes it possible to easily and reliably determine the usage status of the hook 13 even if the image of the main rope 30 cannot be identified from the on-site images due to weather conditions such as backlighting or background images.

[0052] The replacement monitoring unit 400 also refers to the results identified by the identification unit 300 and monitors whether the replacement of two hooks 13A, 13B between two main ropes 30 (main rope 30A on the approach direction side and main rope 30B on the travel direction side (opposite the approach direction)) one end of which is supported on the support 22 is appropriate when worker A proceeds beyond the support 22. The replacement monitoring unit 400 includes a first monitoring unit 410, a first confirmation unit 420, a second monitoring unit 430, a second confirmation unit 440, a third monitoring unit 450, and a third confirmation unit 460.

[0053] In addition, the master rope 30A on the approach direction side and the master rope 30B on the travel direction side are not limited to being positioned in a straight line when viewed from above, but may be positioned so as to be bent at a right angle or the like at the support body 22.

[0054] The first monitoring unit 410 monitors whether or not the worker A is present within a predetermined first monitoring range R1 in the direction in which the two master ropes 30A, 30B extend from each support 22. The first monitoring range R1 is wider than the second monitoring range R2 and the third monitoring range R3 described below, and is a predetermined distance, for example, within 3 m, from the support 22 along the master rope 30A on the approach direction side and the master rope 30B on the travel direction side. In this specification, all distances indicating ranges are distances in the horizontal direction. The first monitoring unit 410 corresponds to the second monitoring unit of the present invention, and the first monitoring range R1 corresponds to the first predetermined range of the present invention.

[0055] When the first monitoring unit 410 detects that a worker A has entered the first monitoring range R1, the replacement monitoring unit 400 monitors the replacement of the hooks 13A and 13B until the worker A leaves the first monitoring range R1. Note that a plurality of workers A may be simultaneously monitored within one first monitoring range R1.

[0056] When the first monitoring unit 410 detects that a new worker A has entered the first monitoring range R1, the first confirmation unit 420 checks whether or not both of the hooks 13A, 13B on the safety belt 10 worn by the worker A are caught on the main rope 30A on the side of the intrusion direction.

[0057] For safety reasons, both of the two hooks 13A, 13B on the safety belt 10 must be caught on the main rope 30. Therefore, the first confirmation unit 420 may determine that both of the hooks 13A, 13B are not caught on the main rope 30A by, for example, detecting that one of the hooks 13A is outside the possible range of the main rope 30A.

[0058] The second monitoring unit 430 checks whether or not the worker A stays within a predetermined second monitoring range R2 for a predetermined period of time or more in the direction in which the two master ropes 30A, 30B extend from the support body 22. The second monitoring unit 430 corresponds to the third monitoring unit of the present invention, and the second monitoring range R2 corresponds to the second predetermined range of the present invention.

[0059] The second monitoring range R2 is the range in which worker A can be present and can sequentially transfer the two hooks 13A, 13B that were hooked onto the main rope 30A on the approach direction side to the main rope 30B on the travel direction side, for example, a range of within 1 m on both the approach direction side and the travel direction side of the support body 22.

[0060] The predetermined time is at least the time required to switch the two hooks 13A and 13B, for example, one second. Note that worker A staying in the second monitoring range R2 for the predetermined time or more means that worker A continues to be within the second monitoring range R2 for the predetermined time or more without going outside the second monitoring range R2, and during that time, the position of worker A may be stationary or moving.

[0061] When worker A is within the second monitoring range R2, the second confirmation unit 440 confirms whether or not both of the hooks 13A, 13B on the safety belt 10 worn by worker A are caught on the main rope 30B on the traveling direction side.

[0062] In addition, the second confirmation unit 440 may determine that both hooks 13A, 13B are not caught on the main rope 30B, for example, by detecting that one of the hooks 13A is located outside the possible range of the main rope 30B.

[0063] The third monitoring unit 450 checks whether or not worker A is located beyond a predetermined third monitoring range R3 in the direction in which the main rope 30A on the traveling direction side extends from the support 22. The third monitoring range R3 is the limit range in which worker A can move away from the support 22 on the traveling direction side while at least one hook 13 is still hooked on the main rope 30A on the entering direction side, based on the length of the rope 12 with the hook 13 attached to the end, and is, for example, 2 m. The third monitoring unit 450 corresponds to the first monitoring unit of the present invention.

[0064] When the third confirmation unit 450 detects that the worker A is positioned in the traveling direction beyond the third monitoring range R3, the third confirmation unit 460 confirms whether or not the two hooks 13A, 13B of the safety belt 10 worn by the worker A are both caught on the main rope 30B in the traveling direction. The third confirmation unit 460 corresponds to the first confirmation unit of the present invention.

[0065] The warning unit 500 issues a warning to the worker A or the manager when the replacement monitoring unit 400 confirms that the worker A has performed an inappropriate replacement work, or when the hook 13 of the worker A is inappropriate based on the result of identification by the identification unit 300, etc. The warning is given by issuing a warning sound, instruction, warning light, etc. from a speaker or warning light, not shown, attached to the work site, the worker, the management building, etc. The warning unit 500 may also display warning information, etc. on a display unit such as a liquid crystal display.

[0066] In addition, the third confirmation unit 460 may determine that both hooks 13A, 13B are not caught on the main rope 30B, for example, by detecting that one of the hooks 13A is located outside the possible range of the main rope 30B.

[0067] Hereinafter, the process performed by the identifying unit 300 of the safety belt use status management system 100 will be described with reference to FIG.

[0068] First, an image acquiring step (S1) is performed in which the image acquiring unit 200 acquires an on-site image captured by the imaging device 50.

[0069] Next, the worker position identifying unit 310 identifies the worker A from the site image acquired by the image acquiring unit 200, and performs a worker position identifying step (S2) of identifying the position of the worker A.

[0070] Next, the hook position identification unit 320 performs a hook position identification process (S3) in which the hook 13 attached to the safety belt 10 worn by the worker A identified by the worker position identification unit 310 is identified from the site image acquired by the image acquisition unit 200, and the position of the hook 13 is identified.

[0071] Then, the support position identification unit 330 performs a support position identification step (S4) in which it identifies the identification unit 40 from the on-site image acquired by the image acquisition unit 200 and identifies the position of the support 22 based on the position of the identified identification unit 40.

[0072] Furthermore, the main rope range setting unit 340 performs a main rope range setting process (S5) to determine the range in which the main rope 30 may exist, based on the position of the support 22 identified by the support position identification unit 330 from the on-site image acquired by the image acquisition unit 200.

[0073] Next, the master rope path identifying unit 350 performs a master rope path identifying step (S6) for determining the path of the master rope 30 within the range set by the master rope range setting unit 340 from the on-site images acquired by the image acquiring unit 200. Then, if the master rope path identifying unit 350 cannot identify the path of the master rope 30 within the range set by the master rope range setting unit 340 (S6: NO), the virtual master rope estimation unit 360 performs a virtual master rope position estimation step (S7) for estimating the range of the path of the virtual master rope assuming that the master rope 30 exists within the range.

[0074] Next, the hooking determination unit 370 performs a hooking determination process (S8) to determine whether the two hooks 13A, 13B of the safety belt 10 worn by each worker A are hooked on the main rope 30 or the virtual main rope, respectively, based on the positional relationship between the position of the main rope 30 or the virtual main rope and the position of the hook 13.

[0075] If it is determined that both or at least one of the hooks 13 of the safety belts 10 worn by each worker A are caught on the life rope 30 or the virtual life rope (S8: YES), it is determined that all safety belts 10 are being used properly, and the image acquisition process (S1) and subsequent steps are repeated.

[0076] If it is determined that both hooks 13 of any of the safety belts 10 worn by the worker A are not caught on the life rope 30 or the virtual life rope (S8: NO), the warning unit 500 performs a warning step (S9) to issue a warning.

[0077] Even if the main rope 30 cannot be identified from the site image within a specified work area, the main rope will remain in that work area until safety is ensured. In other words, the main rope 30 will continue to exist on the same path until the manager issues an instruction to remove the main rope 30. Therefore, until the main rope 30 is removed, the position of the support 22 identified by the support position identifying unit 330, the range in which the main rope 30 may exist set by the main rope range setting unit 340, and the path of the main rope 30 identified by the main rope path identifying unit 350 will not change. Therefore, the support position identifying process (S4) to the virtual main rope position estimating process (S7) may be omitted until the main rope 30 is removed.

[0078] In addition, even if the master rope path identification unit 350 cannot identify the path of the master rope 30 within the range set by the master rope range setting unit 340 (S6: NO), as long as the master rope 30 does not change, the path of the master rope 30 previously identified may be used as the path of the virtual master rope.

[0079] In this way, the positions of the supports 22 are identified from the site images based on the positions of the identification parts that are easily identifiable from the site images. Therefore, the supports 22 between which the life rope 30 is stretched can be identified based on the presence or absence of the identification parts 40. This makes it possible to identify the supports 22 that actually support the life rope 30, excluding the supports 22 that do not support the life rope 30 depending on the progress of the work, etc., and therefore makes it possible to easily and reliably identify the path of the life rope 30.

[0080] Next, the process performed by the replacement monitoring unit 400 of the safety belt use status management system 100 will be described with reference to FIG.

[0081] First, the first monitoring unit 410 performs a first monitoring step (S11) of monitoring whether or not a worker A is present within a first monitoring range R1 from each support 22. When it is confirmed that a worker A has entered the first monitoring range R1, the first monitoring unit 410 continues monitoring until the worker A leaves the first monitoring range R1.

[0082] When worker A newly enters the first monitoring range R1 (S11: YES), the first hooking confirmation unit 420 performs a first hooking confirmation process to confirm whether or not both hooks 13A, 13B on the safety belt 10 worn by the worker A are hooked onto the main rope 30A on the intrusion direction side (S12).

[0083] At this time, if at least one of the hooks 13A, 13B is not caught on the main rope 30A (STEP 12: NO), the warning unit 500 executes a warning step of issuing a warning (S13). This is because it is inappropriate for the worker A to move along the main rope 30A with at least one of the hooks 13A, 13B remaining disengaged.

[0084] The second monitoring unit 430 performs a second monitoring step of monitoring whether or not the worker A stays within the second monitoring range R2 from the support 22 for a predetermined period of time or longer (S14).

[0085] If worker A remains within the second monitoring range R2 for a predetermined time or longer (S14: YES), the second hooking confirmation unit 440 performs a second hooking confirmation process to confirm whether or not both hooks 13A, 13B on the safety belt 10 worn by worker A are hooked onto the main rope 30B on the traveling direction side (S15).

[0086] Furthermore, if worker A is not present within the second monitoring range R2 or worker A stays within the second monitoring range R2 for less than a predetermined time (S14: NO) and the second hooking confirmation unit 440 confirms that both hooks 13A, 13B are hooked onto the main rope 30B on the traveling direction side (S15: YES), it is assumed that worker A has not performed the proper re-hooking operation in this state and has falsely detected an entrapment, and the warning unit 500 performs a warning process to issue a warning (S13).

[0087] If it is confirmed that worker A remains within the second monitoring range R2 for a predetermined period of time or longer (S14: YES) and that both hooks 13A, 13B are hooked onto the main rope 30B on the traveling direction side (S15: YES), the third monitoring unit 450 performs a third monitoring process to monitor whether worker A is located beyond the third monitoring range R3 on the traveling direction side (S16).

[0088] Although not shown in Figure 4, if worker A leaves the second monitoring range R2 and returns to the intrusion direction while the first hooking confirmation unit 420 has confirmed that both hooks 13A, 13B are hooked onto the main rope 30A on the intrusion direction side (S15: NO), the second monitoring unit 430 again monitors whether worker A enters the second monitoring range R2.

[0089] If worker A is located beyond the third monitoring range R3 in the direction of travel (S16: YES), the third hooking confirmation unit 460 performs a third hooking confirmation process to confirm whether or not both hooks 13A, 13B are hooked onto the main rope 30B on the direction of travel (S17).

[0090] At this time, if at least one of the hooks 13A, 13B is not caught on the main rope 30B on the traveling direction side (S17: NO), the warning unit 500 executes a warning step of issuing a warning (S13). This is because it is inappropriate for the worker A to move along the main rope 30B with at least one of the hooks 13A, 13B remaining disengaged.

[0091] Regardless of whether or not worker A is within the first monitoring range R1, if both of worker A's hooks 13 are detached from the main rope 30, the warning unit 500 issues a warning. This is because it is inappropriate to perform work with both hooks 13 detached.

[0092] The present invention is not limited to the above-mentioned embodiment, and can be modified as appropriate. For example, the virtual master rope position estimating unit 170 and the virtual master rope position estimating step (S7) may not be provided, and the virtual master rope may not be estimated. Furthermore, the position identification of the hook 13, the support body 22, the master rope 30, etc. is not limited to the above-mentioned, and may be based on known techniques including those described in Patent Documents 1 to 3 above. [Explanation of symbols]

[0093] 10...safety belt, 11...belt, 12...rope, 13...hook, 20...post, 21...post body, 22...retaining fitting, support (support section), 30...main rope, 31...hook section, 32...rope, 40...identification section, 50...imaging device, 100...safety belt usage status management system, 200...image acquisition section, 300...identification section, 310...worker position identification section, 320...hook position identification section, 330...support position identification section, 340...main rope range setting section, 350...main rope path identification section, 360...virtual main rope estimation section, 370...hooking determination section, 400...replacement monitoring section 400, 410...first monitoring section (second monitoring section), 420...first confirmation section, 430...second monitoring section (third monitoring section), 440...second confirmation unit, 450...third monitoring unit (first monitoring unit), 460...third confirmation unit (first confirmation unit), 500...warning unit, A...worker, N...network, R1...first monitoring range (first specified range), R2...second monitoring range (second specified range), R3...third monitoring range.

Claims

1. an image acquisition unit that acquires site images of a site where a worker is working; a worker position identifying unit that identifies a position of the worker from the site image; a hook position identifying unit that identifies the positions of two hooks attached via ropes to a belt of a safety belt worn by the worker from the site image; a support position identifying unit that identifies the positions of a plurality of supports from the on-site image; a lifeline path identifying unit that identifies a path of a lifeline stretched between the supports based on the identified positions of the supports from the site image; a hooking determination unit that determines whether or not the hook is hooked on the life rope based on a positional relationship between the position of the hook and the path of the life rope; a first monitoring unit that monitors whether the worker has moved beyond the support and in the traveling direction from the support a predetermined distance that is equal to or greater than the length of the rope; a first confirmation unit that confirms whether or not the two hooks provided on the safety belt worn by the worker who has detected the movement are both hooked onto the life rope on the traveling direction side; and a warning unit that issues a warning when the first confirmation unit confirms that at least one of the two hooks is not caught on the life rope on the traveling direction side.

2. a second monitoring unit that monitors whether or not the worker is present within a first predetermined range that is equal to or greater than the predetermined distance from the support; The safety belt use status management system according to claim 1 , wherein the first monitoring unit monitors the worker monitored by the second monitoring unit.

3. a third monitoring unit that monitors whether the worker is present within a second predetermined range that is less than the predetermined distance from the support for a predetermined period of time or more; The safety belt usage status management system according to claim 1, characterized in that the warning unit issues a warning when the first hook confirmation unit confirms that both of the hooks are hooked on the life rope on the traveling direction side within the second predetermined range within a time period less than the predetermined time.

4. acquiring site images of a site where a worker is working; Identifying a position of the worker from the site image; Identifying the positions of two hooks attached via ropes to a belt of a safety belt worn by the worker from the site image; identifying positions of a plurality of supports from the in-situ images; Identifying a path of a lifeline stretched between the supports from the on-site image based on the identified positions of the supports; determining whether or not the hook is caught on the life rope based on a positional relationship between the position of the hook and the path of the life rope; monitoring whether the worker has passed over the support and moved from the support toward the traveling direction by a predetermined distance equal to or greater than the length of the rope; a step of confirming whether or not the two hooks provided on the safety belt worn by the worker who has detected the movement are both caught on the life rope on the traveling direction side; and a step of issuing a warning when it is confirmed that at least one of the two hooks is not caught on the life rope on the traveling direction side.

Images