Safety management system and safety management method

Abstract

To perform accurate and efficient safety management at a construction site.SOLUTION: A safety management system 1 comprises: a position detection unit 11 that detects the position of a movable body arranged in a construction site; an imaging unit 12 that can change an imaging range; and a control unit 10 that acquires information on the position of the movable body from the position detection unit 11 and controls the imaging unit 12. When the situation of operations around the position detection unit 11 does not satisfy a predetermined reference, the control unit 10 controls the imaging unit 12 to pick up an image of the situation of operations around the position detection unit 11 on the basis of the position information.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a safety management system and a safety management method for managing safety at a construction site. [Background technology]

[0002] At construction sites, there are tasks where objects and people, such as electric lines and construction machinery, or construction machinery and workers, come close to each other. Data captured by cameras has been recorded with the aim of feeding back the status of such tasks to the construction site. For example, Patent Document 1 proposes a system that includes a position detection terminal attached to a moving object, a camera capable of changing the position of the object to be photographed, and a camera control device that controls the position of the object to be photographed. The camera moves along rails that surround the photographing area, and photographs the moving object as it moves. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-130230 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, providing a large number of rails at a construction site so that each of the numerous construction machines can be tracked and photographed is time-consuming and impractical. [Means for solving the problem]

[0005] A safety management system that solves the above problems comprises a position detection unit that is placed within a construction site and detects the position of a moving body, an imaging unit that can change the imaging range, and a control unit that acquires position information of the moving body from the position detection unit and controls the imaging range of the imaging unit, and when the work situation around the position detection unit does not satisfy a predetermined standard, the control unit controls the imaging unit to capture an image of the work situation around the position detection unit based on the position information.

[0006] A safety management method that solves the above problems is a method of managing safety at a construction site using a position detection unit that is placed within the construction site and detects the position of a moving body, an imaging unit that is capable of changing the imaging range, and a control unit that controls the imaging range, in which the control unit acquires position information of the moving body from the position detection unit, and if the work situation around the position detection unit does not meet a predetermined standard, controls the imaging unit to capture an image of the work situation around the position detection unit based on the position information. Effect of the Invention

[0007] According to the present invention, safety management at a construction site can be carried out accurately and efficiently. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram showing an outline of a safety management system according to a first embodiment. [Diagram 2] FIG. 2 is a block diagram showing functions of a control unit in the embodiment. [Diagram 3] FIG. 2 is a diagram illustrating an application example of the safety management system according to the embodiment. [Figure 4] 10 is a flowchart showing a processing procedure of a safety management method according to the embodiment. [Diagram 5] FIG. 11 is a diagram showing another application example of the safety management system of the embodiment. [Figure 6] FIG. 11 is a diagram illustrating an application example of a safety management system according to a second embodiment. [Figure 7] FIG. 13 is a diagram illustrating an application example of a safety management system according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (First embodiment) A first embodiment of a safety management system and a safety management method will be described below with reference to Figures 1 to 5. The safety management system of the first embodiment determines whether or not an appropriate distance is maintained between a stationary body and a moving body that are targets of determination, as a predetermined criterion.

[0010] 1, the safety management system 1 includes a control unit 10, a position detection unit 11, and an imaging unit 12. These are connected via a communication network such as the Internet, a LAN (Local Area Network), or a mobile communication network.

[0011] The position detection unit 11 is placed within a construction site and detects its position. The position detection unit 11 is a sensor that identifies absolute coordinates based on a positioning signal received from a Global Navigation Satellite System (GNSS). Here, the absolute coordinates are latitude, longitude, and altitude. The position detection unit 11 is attached to a moving body. The moving body may be a construction machine or the like, but may be anything that should avoid contact with a stationary object that is the target.

[0012] The imaging unit 12 is a camera whose imaging range can be changed by remote control. The imaging unit 12 is a so-called PTZ camera that can perform pan, tilt, and zoom operations based on commands received from the control unit 10. In other words, the imaging unit 12 can change the horizontal angle, elevation / depression angle, and magnification ratio (reduction ratio).

[0013] The control unit 10 controls the imaging unit 12 based on the position information acquired from the position detection unit 11. When the work situation at the construction site does not satisfy the criteria, the control unit 10 controls the imaging unit 12 to capture an image of the work situation.

[0014] The control unit 10 is a microcontroller (MCU, Micro Controller Unit) or the like. The control unit 10 includes a processor H10, a storage device H11, and a communication device H12. These are connected via a system bus H13 or the like. Note that this hardware configuration is an example, and it is also possible to realize the control unit 10 using other hardware.

[0015] The processor H10 controls each process using programs and data stored in the storage device H11. Examples of the processor H10 include a CPU, an MPU, and the like. The processor H10 is not limited to a processor that performs software processing for all the processes it executes. For example, the processor H10 may include a dedicated hardware circuit (e.g., an application specific integrated circuit: ASIC) that performs hardware processing for at least a part of the processes it executes. That is, the processor H10 may be configured as any of the following:

[0016] [1] One or more processors that operate according to a computer program (software). [2] One or more dedicated hardware circuits that perform at least some of the various processes [3] Circuits that include combinations of these The storage device H11 (computer-readable medium) stores data and various programs for executing various functions of the control unit 10. The storage device H11 is composed of, for example, a main storage device and an auxiliary storage device. Examples of the storage device H11 include a ROM, a RAM, and a hard disk. The storage device H11 includes any available recording medium that can be accessed by a general-purpose or dedicated computer.

[0017] The communication device H12 is an interface that establishes a communication path between the position detection unit 11 and the imaging unit 12 via a communication network and transmits and receives data. For example, the communication device H12 may include a module (e.g., a Subscriber Identity Module) that records a subscriber identification number for using a mobile communication network.

[0018] As shown in FIG. 2, the control unit 10 functions as a position acquisition unit 20, a determination unit 21, and a control amount calculation unit 22 by the processor H10 executing a program stored in the storage device H11. The position acquisition unit 20 identifies the position of the position detection unit 11 based on the position information received from the position detection unit 11 attached to the moving object. The position acquisition unit 20 also acquires the position information of the stationary object stored in the storage device H11. The stationary object may be a stationary object in or around the construction site, such as an electric line such as an electric wire, a building, a road, or a railway, with which the moving object in the construction site should avoid contact. The position information of the stationary object is acquired in advance through surveying or the like, and is recorded in the storage device H11.

[0019] The determination unit 21 determines whether or not the work situation around the position detection unit 11 at the construction site satisfies a predetermined standard. Here, the determination unit 21 determines whether or not an appropriate distance is maintained between the moving body equipped with the position detection unit 11 and the stationary body. The appropriate distance is a distance at which the stationary body and the moving body are considered unlikely to come into contact (the risk of contact is low), and is a distance equal to or greater than a threshold. The threshold is set in advance according to the size of the stationary body and the moving body, and is stored in the storage device H11. When the determination unit 21 determines that an appropriate distance is not maintained between the moving body and the stationary body, it outputs a command to the control amount calculation unit 22 to follow and capture the moving body.

[0020] The control amount calculation unit 22 calculates the control amount of the imaging unit 12 for capturing an image of the moving object based on the position of the moving object. The control amount calculation unit 22 calculates the control amount of the imaging unit 12 so that the moving object can be captured based on the latitude, longitude, and height, which are the position information of the moving object, and the position of the imaging unit 12. The control amount is, for example, the amount of pan, tilt, and zoom operations of the imaging unit 12. For example, the control amount calculation unit 22 calculates the control amount so as to capture a notable part of the moving object. Alternatively, the control amount calculation unit 22 may calculate the control amount so as to capture at least a part of the moving object and at least a part of the stationary object based on the position of the moving object as well as the position of the stationary object. The control amount calculation unit 22 controls the imaging unit 12 by transmitting a command including the control amount to the imaging unit 12.

[0021] The imaging unit 12 operates according to a control amount included in a command received from the control unit 10. Then, the imaging unit 12 transmits captured data to the imaging data storage unit 13 (see FIG. 1) via a network. For example, the imaging data storage unit 13 is a storage included in an information processing device such as an external server. Alternatively, the imaging data storage unit 13 may be a storage that is integrated with the imaging unit 12.

[0022] A user such as a safety manager at a construction site uses a user device 15 (see FIG. 1) to acquire imaging data from the imaging data storage unit 13. Then, the user device 15 outputs the imaging data to a display. The user checks the work status at the construction site by visually checking the video (or still images) displayed on the display.

[0023] An example of the safety management system 1 and safety management method will be described with reference to Figs. 3 to 5. In this example, the position detection unit 11 is provided in a construction machine 30, which is a mobile object. The control unit 10 judges whether or not an appropriate distance is maintained between the construction machine 30 and a stationary object. The stationary object is a stationary object located within or around a construction site. Position information of the stationary object is recorded in advance in a storage device H11.

[0024] In the example of Fig. 3, the construction machine 30 is a crane truck 31. The crane truck 31 performs operations such as extending and retracting the boom 32 and swinging. The position detection unit 11 is provided at the tip of the boom 32. The position detection unit 11 detects the position of the tip of the moving boom 32 and transmits it to the control unit 10. In the example of Fig. 3, the stationary object is an electric wire 33. Position information of the electric wire 33 is stored in the memory device H11.

[0025] With reference to Fig. 4, the processing procedure executed by the control unit 10 in the example of Fig. 3 will be described. As a premise, when the working conditions at the construction site meet an appropriate standard, the control unit 10 drives the imaging unit 12 to capture an image of a wide range of the construction site. The imaging state of the imaging unit 12 at this time is called a standard state. For example, in the standard state, the horizontal angle, elevation / depression angle, and magnification rate of the imaging unit 12 may be set to predetermined values. The imaging range in the standard state may include multiple construction machines 30.

[0026] The position acquisition unit 20 acquires position information of a moving object (step S1). The position acquisition unit 20 identifies the latitude, longitude, and height of the tip of the boom 32 based on the position information. Furthermore, position acquisition unit 20 acquires position information of electric wire 33 from storage device H11. Then, determination unit 21 determines whether or not the work status of crane vehicle 31 meets a criterion based on the position information of the tip of boom 32 and the position information of electric wire 33 (step S2). Specifically, determination unit 21 determines whether or not the relative distance between the position of the tip of boom 32 and the position of electric wire 33 is equal to or greater than a threshold. If the relative distance is equal to or greater than the threshold, it is determined that the work status of crane vehicle 31 meets the criterion.

[0027] If the determination unit 21 determines that the relative distance is equal to or greater than the threshold (step S2: YES), the image capture unit 12 is set to the standard state (step S3). On the other hand, if the determination unit 21 determines that the relative distance is less than the threshold (step S2: NO), the control amount calculation unit 22 determines that the risk of contact has increased and calculates the control amount of the image capture unit 12 (step S4).

[0028] The control amount calculation unit 22 calculates a control amount so that at least the tip of the boom 32 is included in the imaging range. The method of calculating the control amount is not particularly limited, but for example, the control amount calculation unit 22 determines the magnification ratio of the imaging unit 12 so that the tip of the boom 32 and the electric wires 33 are included. This magnification ratio is larger than the magnification ratio in the standard state. Furthermore, the control amount calculation unit 22 calculates a control amount for performing at least one of panning and tilting operations at the determined magnification ratio so that the tip of the boom 32 is included.

[0029] The control amount calculation unit 22 transmits a command including the calculated control amount to the imaging unit 12 (step S5). As a result, the imaging unit 12 captures an image focusing on the crane vehicle 31 approaching the electric wire 33. The imaging state of the imaging unit 12 at this time is called a following state in comparison with the standard state.

[0030] That is, the control unit 10 repeatedly executes steps S1 to S5, and therefore maintains the imaging unit 12 in a following state while it continues to determine that the relative distance between the tip of the boom 32 and the electric wire 33 is less than the threshold value. As a result, the imaging unit 12 follows the operation of the crane vehicle 31 and captures images.

[0031] If the control unit 10 determines that the relative distance between the position of the tip of the boom 32 and the position of the electric wire 33 is less than a threshold value and then determines that the relative distance is equal to or greater than the threshold value, it determines that the work situation meets the criteria (step S2: YES) and returns the imaging unit 12 from the following state to the standard state.

[0032] According to this, even if there are many construction machines 30 at a construction site and it is not possible to grasp all the work conditions by visual inspection or wide-area imaging, the safety manager can check the work conditions that do not meet the predetermined standards through the imaging data. In addition, since the safety management system 1 automatically records the imaging data, it is possible to reduce omissions in recording compared to manual work by the safety manager. In addition, since the position acquisition unit 20 acquires the position information from the position detection unit 11, preparation such as machine learning for recognizing a moving object is not required compared to the case where a moving object is recognized by image processing.

[0033] FIG. 5 is another example of the safety management system 1. In the example of FIG. 5, the construction machine 30 is a backhoe 35, but may be another construction machine. The backhoe 35 is provided with a position detection unit 11. For example, the position detection unit 11 is provided on the boom of the backhoe 35. In addition, a laser barrier 36 generated by an approach monitoring system (not shown) is provided at the construction site. The laser barrier 36 is output (scanned) in a planar manner from a laser emission device to the boundary of the area to prevent at least a part of the construction machine 30 from going beyond the area of ​​the construction site. The position information of the laser barrier 36 is stored in the storage device H11 of the control unit 10. In addition, the imaging unit 12 captures images of not only the specific backhoe 35 but also other objects and people in the standard state.

[0034] The processing procedure of the control unit 10 in this embodiment is almost the same as the above procedure, except that the stationary object is different. That is, the position acquisition unit 20 uses the position detection unit 11 to identify the position of the boom of the backhoe 35 (step S1), and acquires the position information of the laser barrier 36. Then, the determination unit 21 determines whether or not an appropriate distance is maintained between the construction machine 30 and the laser barrier 36, based on the positions of the backhoe 35 and the laser barrier 36. Specifically, the determination unit 21 determines whether or not the relative distance between the positions of the backhoe 35 and the laser barrier 36 is equal to or greater than a threshold value.

[0035] When the determination unit 21 determines that the relative distance is equal to or greater than the threshold (step S2: YES), the imaging unit 12 is set to the standard state. When the determination unit 21 determines that the relative distance is less than the threshold (step S2: NO), the control amount calculation unit 22 calculates a control amount so that the boom of the backhoe 35 is included in the imaging range (step S4). The control amount calculation unit 22 transmits a command including the control amount to the imaging unit 12 (step S5). The imaging unit 12 drives the imaging unit 12 according to the received command.

[0036] As described above, according to the first embodiment, the following effects can be obtained. (1-1) When the control unit 10 determines that the work situation does not satisfy a predetermined standard based on the position information detected by the position detection unit 11, it controls the imaging unit 12 to capture the work situation. Therefore, scenes that require attention in terms of safety management can be automatically recorded as imaging data. This prevents omissions in recording and eliminates the need for safety managers and the like to manually operate the imaging unit 12, thereby enabling accurate and efficient safety management at the construction site.

[0037] (1-2) When the criterion that an appropriate distance is maintained between a moving object and a stationary object that should be avoided from contact is not met, the control unit 10 controls the imaging unit 12 to capture images of the moving object and the stationary object based on their position information. This makes it possible to automatically record scenes where the risk of contact is high.

[0038] Second embodiment A second embodiment of the safety management system and safety management method will be described. The safety management system of the second embodiment judges whether an appropriate distance is maintained between a moving object and a moving body as a standard that the work situation should satisfy at a construction site. Descriptions of the same configuration and processing as the first embodiment will be omitted.

[0039] As shown in Fig. 6, a construction machine 30, which is a moving body, is provided with a monitoring system 40 and a position detection unit 11. The position detection unit 11 is similar to that in the first embodiment. In the example of Fig. 6, the construction machine 30 is a backhoe 35, but may be another type of construction machine 30. The position of the position detection unit 11 is not particularly limited.

[0040] The monitoring system 40 detects the approach of a person 45 to the construction machine 30. The monitoring system 40 includes a monitoring control unit 42 and an imaging device 41. The person 45 is a moving object that may come into contact with the construction machine 30. The monitoring system 40 also includes an alarm device and an emergency stop device, not shown. The alarm device outputs an alarm when the person 45 approaches. The emergency stop device stops the operation of the construction machine 30 when the person 45 approaches even closer.

[0041] The imaging device 41 includes a stereo camera and calculates the relative distance to the moving object based on the parallax between the stereo cameras. For example, the imaging device 41 includes two pairs of stereo cameras. The stereo cameras capture images of the rear range (for example, 180 degrees) of the construction machine 30.

[0042] The monitoring control unit 42 acquires a captured image from the imaging device 41. The monitoring control unit 42 also recognizes a person 45 by detecting the features of a subject using a learning result (image recognition model) stored in a storage device of the monitoring control unit 42. When the monitoring control unit 42 recognizes a person, it also calculates a relative distance to the person 45 based on the parallax of the stereo camera.

[0043] The monitoring control unit 42 determines whether the relative distance between the person 45 and the construction machine 30 is equal to or greater than a threshold based on the result of image recognition. When the monitoring control unit 42 determines that the relative distance between the person 45 and the construction machine 30 is less than the threshold, it activates an alarm device to alert the person 45 and the operator of the construction machine 30. In addition, the emergency stop device stops the construction machine 30 when the relative distance falls below a threshold that is even smaller than the threshold for outputting an alarm.

[0044] Furthermore, when the monitoring control unit 42 determines that the relative distance between the person 45 and the construction machine 30 is less than the threshold, it determines that the person 45 is within the warning area 46 and transmits approach information to the control unit 10 of the safety management system 1. For example, the warning area 46 is an area that spreads in a fan shape from the rear end of the construction machine 30. The control unit 10 may acquire the position information of the construction machine 30 from the position detection unit 11 separately from the approach information. Specifically, the control unit 10 may acquire the position information of the construction machine 30 from the position detection unit 11 at a predetermined time interval. Alternatively, the control unit 10 may acquire the position information of the construction machine 30 from the position detection unit 11 when the control unit 10 receives the approach information. Alternatively, the monitoring control unit 42 may acquire the position information of the construction machine 30 detected by the position detection unit 11 and include the position information in the approach information. Furthermore, the approach information may include the relative distance between the person 45 and the construction machine 30.

[0045] The processing procedure of the second embodiment will be described with reference to FIG. The control unit 10 acquires the position information of the construction machine 30 detected by the position detection unit 11 (step S1). The determination unit 21 determines whether the work situation satisfies the criteria based on whether approach information has been received from the monitoring control unit 42 (step S2). Note that the order of steps S1 and S2 does not matter. If approach information has not been received, the determination unit 21 determines that the work situation satisfies the criteria (step S2: YES) and sets the imaging unit 12 to the standard state (step S3).

[0046] On the other hand, when the control unit 10 receives approach information, the determination unit 21 determines that the work situation does not satisfy the criteria (step S2: NO), and the control amount calculation unit 22 calculates a control amount for the imaging unit 12 to capture an image of the backhoe 35 and part of the warning area 46 (step S4). At this time, the control amount calculation unit 22 may calculate a control amount for the imaging unit 12 so that the construction machine 30 and the warning area 46 behind it are included in the imaging range, using a threshold (distance) for the monitoring system 40 to determine that the person 45 is within the warning area 46. The control amount calculation unit 22 transmits the calculated control amount to the imaging unit 12 (step S5).

[0047] The control unit 10 controls the imaging unit 12 to follow and capture images of the construction machine 30 while receiving approach information from the monitoring control unit 42. This makes it possible to automatically record image data of a situation in which a person 45 approaches the construction machine 30.

[0048] In the second embodiment, in addition to the effect described in (1-1) of the first embodiment, the following effect can be obtained. (2-1) In the above embodiment, when two moving objects, that is, the construction machine 30 and the person 45, approach each other, the working situation can be captured. In addition, since the control unit 10 receives approach information from the monitoring system 40, the load on the control unit 10 can be reduced.

[0049] Third embodiment A third embodiment of the safety management system and safety management method will be described. The safety management system of the third embodiment determines whether the noise level of work sounds generated at a construction site is kept below a threshold as a standard that the work situation at the construction site must meet. Descriptions of configurations and processes similar to those of the first embodiment will be omitted.

[0050] As shown in Fig. 7, the construction machine 30 is provided with a position detection unit 11. The position detection unit 11 is similar to that in the first embodiment. The construction machine 30 is also provided with an environmental measurement device 50 (environment measurement system). In this embodiment, the environmental measurement device 50 measures work sounds at a construction site.

[0051] The environmental measuring device 50 measures the noise level (for example, in units of "dB") indicating the loudness of the sound generated at the construction site, and transmits a detection signal to the control unit 10 when the noise level exceeds a threshold. The control unit 10 receives a detection signal from the environmental measuring device 50 indicating that the work sound has exceeded the threshold. Note that, although the environmental measuring device 50 is provided on the construction machine 30 in the example of FIG. 7, it may also be fixed to a specific position on the construction site. In this case, the position detection unit 11 is provided alongside the environmental measuring device 50 or in the vicinity thereof.

[0052] The processing procedure of the third embodiment will be described with reference to FIG. The position acquisition unit 20 acquires position information from the position detection unit 11 (step S1). The determination unit 21 determines whether the work situation satisfies the criteria based on whether a detection signal has been received from the environment measurement device 50 (step S2). Note that the order of steps S1 and S2 does not matter. If the determination unit 21 has not received a detection signal, it determines that the work situation satisfies the criteria (step S2: YES) and sets the imaging unit 12 to the standard state (step S3).

[0053] On the other hand, when the control unit 10 receives a detection signal, the determination unit 21 determines that the working situation does not satisfy the criteria (step S2: NO), and the control amount calculation unit 22 calculates a control amount for the imaging unit 12 to capture an image of the periphery of the position detection unit 11 (step S4). That is, the control amount calculation unit 22 calculates a control amount for capturing an image of an area where noise exceeding the threshold level is occurring. The control amount calculation unit 22 transmits the calculated control amount to the imaging unit 12 (step S5).

[0054] The control unit 10 repeats steps S1 to S5. While the control unit 10 continues to receive the detection signal, it tracks and captures the image of the construction machine 30. When the position detection unit 11 is fixed to a specific position, it is sufficient to obtain the position of the position detection unit 11 only once, and step S1 does not need to be repeated.

[0055] In addition to the effect (1-1) of the first embodiment, the third embodiment has the following effect. (3-1) When a work sound generated in a construction site exceeds a threshold level, the control unit 10 controls the imaging unit 12 based on the position information of the position detection unit 11 located in the area where the work sound is generated. This makes it possible to automatically record the work situation where the work sound becomes loud.

[0056] The above-described embodiment can be modified as follows: Each embodiment and the following modified examples can be combined with each other to the extent that there is no technical contradiction. In each of the above embodiments, the image capture unit 12 is capable of controlling the pan, tilt and zoom operations by remote control, but one or two of these operations may be changeable.

[0057] The position detection unit 11 is a sensor that receives a positioning signal from a GNSS including a GPS (Global Positioning System) to detect a position. Alternatively or in addition to this, the position detection unit 11 may use a stereo camera, LiDAR (Light Detection and Ranging, or Laser Imaging Detection and Ranging), or the like. Furthermore, the position detection unit 11 is configured to detect absolute coordinates such as latitude, longitude, and height, but may also detect relative coordinates with a preset reference position. For example, the position of the imaging unit 12 may be set as the reference position, and the position detection unit 11 may detect relative coordinates from the imaging unit 12.

[0058] In the safety management system 1 of the first embodiment that monitors the relative distance between the laser barrier 36 and the construction machine 30, the control unit 10 calculates the relative distance using the position of the construction machine 30 based on the position detection unit 11 and the position of the laser barrier 36. Alternatively or in addition to this, the control unit 10 may determine that the work situation does not meet the criteria when it receives a signal indicating that the relative distance between the laser barrier 36 and the construction machine 30 is less than a threshold value from a monitoring device (not shown) included in the laser barrier system.

[0059] In the second embodiment, whether or not an appropriate distance is maintained between the construction machine 30 and the person 45 is determined by providing the monitoring system 40 in the construction machine 30, but the relative distance between the construction machine 30 and the person 45 may be determined without using the monitoring system 40. For example, the person 45 may be provided with a position detection unit 11. When the control unit 10 determines that the relative distance between the person 45 and the construction machine 30 is less than a threshold based on position information based on the position detection unit 11 provided in the person 45 and position information based on the position detection unit 11 provided in the construction machine 30, the control unit 10 may calculate a control amount for the imaging unit 12 so as to capture an image of the person 45 and the construction machine 30, and control the imaging unit 12.

[0060] In the second embodiment, the monitoring system 40 is configured to transmit approach information when a person 45 enters an alarm area in which the relative distance from the construction machine 30 is less than a threshold. Alternatively, the monitoring system 40 may set an alarm area 46 in which the relative distance from the construction machine 30 is less than a first threshold, and a stop area in which the relative distance is less than a second threshold that is smaller than the first threshold. The alarm area 46 is an area in which an alarm is output when a person 45 enters. The stop area is an area in which the operation of the construction machine 30 is forcibly stopped when a person 45 enters. In this case, the monitoring system 40 may transmit approach information to the safety management system 1 when a person enters the stop area.

[0061] In the third embodiment, the environmental measuring device 50 measures the noise level. Instead of or in addition to this, the environmental measuring device 50 may measure environmental information such as temperature, humidity, wind speed, weather, etc. at the construction site. Then, the environmental measuring device 50 may transmit detection information to the control unit 10 when the environmental information does not satisfy a standard that is considered appropriate at the construction site.

[0062] In each of the above embodiments, the control unit 10 sets the imaging unit 12 to either the standard state or the following state. Alternatively or in addition to this, the imaging unit 12 may be set to either of three or more stages of states, such as the standard state, the first following state, and the second following state. For example, when the safety management system 1 monitors the relative distance between a stationary body and a moving body, or the relative distance between moving bodies, the safety management system 1 may set the imaging unit 12 to the first following state when the relative distance is less than a first threshold, and set the imaging unit 12 to the second following state when the relative distance is less than a second threshold that is smaller than the first threshold. For example, in the second following state, the magnification ratio may be larger than the magnification ratio set in the first following state. Alternatively, the control unit 10 may not change the state of the imaging unit 12 in a stepwise manner, but may continuously increase the magnification ratio as the moving body approaches the stationary body or another moving body.

[0063] In each of the above embodiments, the determination unit 21 determines whether the relative distance between a stationary object and a moving object, and between moving objects, is less than a threshold value, using the position detection unit 11. Alternatively or in addition to this, the determination unit 21 may recognize a moving object or a stationary object by image processing.

[0064] Next, the technical ideas that can be understood from the above embodiment and other examples will be described below. [A] The safety management system described in claim 1, wherein the control unit controls the imaging unit to follow and image the construction machine based on the position information when approach information is received from a monitoring system that detects the approach of a person between the construction machine and the person. [Explanation of symbols]

[0065] 1... safety management system, 10... control unit, 11... position detection unit, 12... imaging unit.

Claims

1. A position detection unit that is disposed within a construction site and detects the position of a moving object; An imaging unit capable of changing an imaging range; a control unit that acquires position information of the moving object from the position detection unit and controls an imaging range of the imaging unit, A safety management system in which the control unit controls the imaging unit to capture an image of the work situation around the position detection unit based on the position information when the work situation around the position detection unit does not satisfy a predetermined standard.

2. The position detection unit is attached to a construction machine, 2. The safety management system according to claim 1, wherein the control unit controls the imaging unit to follow and image the construction machine based on the position information when the criterion that an appropriate distance is maintained between the construction machine and an object that may come into contact with the construction machine is not met.

3. 2. The safety management system according to claim 1, wherein when the control unit detects that the criterion that work noise generated around the position detection unit is kept at an appropriate level is not met, the control unit controls the imaging unit to capture an image of the periphery of the position detection unit based on the position information.

4. A method for managing safety at a construction site using a position detection unit that is arranged in the construction site and detects the position of a moving object, an imaging unit that can change an imaging range, and a control unit that controls the imaging range, The control unit: acquiring position information of the moving object from the position detection unit; A safety management method comprising: when a work situation around the position detection unit does not satisfy a predetermined standard, controlling the imaging unit to capture an image of the work situation around the position detection unit based on the position information.

Images