JP7393192B2 - safety control system - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act (1) Publication location https://www. ttl. fi/visionzero19/wp-content/uploads/sites/9/2019/11/VZ2019_Proceedings-vr2. pdf Publication date: November 11, 2020 (2) Publication location: Vision Zero Summit 2019, Helsinki, Finland Publication date: November 14, 2021

The present invention relates to technology for ensuring the safety of workers at construction sites.

At construction sites such as tunnels, bridges, and buildings, various heavy machinery (construction machinery) such as wheel loaders, dump trucks, and crane trucks are used. In areas where heavy machinery is used within construction sites, if a worker gets off the heavy machinery in that area or enters the area without getting on the heavy machinery, It is dangerous for workers as there is a risk of contact (hereinafter, this area will be referred to as the "dangerous area").

Therefore, in order to ensure the safety of workers at construction sites, for example, Patent Document 1 proposes that heavy machinery outputs ultrasonic waves and warns the worker when the worker approaches the distance where the ultrasonic waves can reach. A technique to do this has been proposed.

Japanese Unexamined Patent Publication No. 1-12285

However, heavy machinery working in the dangerous area is often in the middle of forward, backward, turning, or other operations. Therefore, if a warning is issued when the worker approaches the heavy equipment, there is a risk that the warning will not be delivered in time. In addition, if a worker hides behind stopped heavy machinery or materials (i.e., if the ultrasonic waves are blocked by materials or other heavy machinery), the worker will be detected. I won't be able to do that. In such a situation, if a worker suddenly jumps out from behind stopped heavy machinery or materials, there is a risk that the warning will not be received in time and the worker and the heavy machinery will come into contact.

Therefore, an object of the present invention is to provide a safety control system that can achieve high safety at construction sites.

The safety control system according to the present invention is a system applicable to construction sites where a safe area and a dangerous area exist, and includes a worker detection section, a judgment processing section, and a warning processing section. The worker detection unit detects the position of each worker working at the construction site. The determination processing unit determines, for each worker working at the construction site, whether the worker is in a safe area or in a safe place in a dangerous area, based on the detection result of the worker detection unit. to judge. Then, if the judgment processing unit determines that at least one of the workers is "not in a safe area" or "not in a safe place," the danger processing department issues a warning to the danger area. conduct.

According to the above-mentioned safety control system, workers who are working on heavy equipment in a dangerous area can be alerted if a danger has occurred on the construction site (such as if the worker is not in the safe area or if the worker is in danger). This makes it possible to alert the user to things such as not being in a safe place in the area. If a worker working on a heavy machine in a dangerous area is alerted by the above warning, the worker in the dangerous area should, for example, stop the heavy machine and interrupt the work. contact can be avoided.

Specifically, the determination processing unit determines for each worker working at a construction site whether the worker has entered a dangerous area from a safe area based on the detection results of the worker detection unit, and determines whether the worker has entered a dangerous area from a safe area. When it is determined that the person has entered the safe area, it can be determined that the person is not within the safe area. The determination processing unit also determines, for each worker working at the construction site, whether or not the worker is riding on heavy machinery used at the construction site, based on the detection result of the worker detection unit. , if the worker is determined to be "not on board" when the worker is in a dangerous area, it can be determined that the worker is "not in a safe location".

In the above safety control system, the warning processing unit issues a warning to enter the dangerous area when the judgment processing unit determines that at least one of the workers has entered the dangerous area without riding the heavy equipment. Good too. According to such a warning inside a dangerous area, a worker who is working on a heavy machine in the dangerous area is notified that a danger has occurred on the construction site (a worker is riding on a heavy machine in a dangerous area). It is possible to warn people by informing them that they have entered the vehicle without entering the vehicle. If a worker working on a heavy machine in a dangerous area is alerted by the above warning, the worker who has entered the dangerous area should, for example, stop the heavy machine and interrupt the work. contact can be avoided.

In the above safety control system, if the judgment processing unit determines that at least one of the workers has entered a dangerous area by riding on a heavy machine, the warning processing unit does not issue a warning to enter the dangerous area. Thereafter, if the determination processing unit determines that the worker is not riding on a heavy machine even though the worker is inside the danger area, a warning may be issued to the operator inside the danger area. According to such a warning inside a dangerous area, a worker who is working on a heavy machine in the dangerous area is notified that a danger has occurred on the construction site (a worker is not allowed to get off the heavy machine in the dangerous area). It is possible to warn people by informing them of what they have done). If a worker working on a heavy machine in a dangerous area is alerted by the above warning, the worker should stop the heavy machine and interrupt the work, for example, and get off the machine in the dangerous area. Contact with workers can be avoided.

The safety control system may further include a heavy equipment detection unit that detects the position of each heavy equipment used at a construction site. In this configuration, the determination processing unit may further determine for each heavy machine whether or not the heavy machine exists in the dangerous area based on the detection result of the heavy machine detection unit. When the judgment processing section determines that at least one of the heavy machinery is "in a dangerous area" and that at least one of the workers is "in a safe area", If the determination processing unit further determines that the person is not in a dangerous area or is not in a safe area, a warning may be given to the person in a dangerous area. According to this configuration, it is possible to issue a warning to the dangerous area only when heavy machinery is present in the dangerous area and there is a risk of a worker coming into contact with the heavy machinery within the dangerous area.

According to the present invention, it is possible to achieve high safety at construction sites.

It is a conceptual diagram showing a tunnel construction site viewed from the side. It is a conceptual diagram showing a tunnel construction site viewed from above. FIG. 1 is a block diagram conceptually showing the configuration of a safety control system applied to a tunnel construction site. It is a flowchart showing a part of control processing (first safety control processing) executed by the management server. It is a flowchart showing the remaining part of the control process (first safety control process) executed by the management server. It is a flow chart showing control processing (second safety control processing) executed by a control device mounted on each heavy machine.

[1] Embodiment An embodiment in which a safety control system is applied to a tunnel construction site will be specifically described.

[1-1] Overview FIG. 1 is a conceptual diagram showing a tunnel construction site viewed from the side, and FIG. 2 is a conceptual diagram showing the construction site viewed from above. At a tunnel construction site, tunnel excavation progresses by repeatedly crushing rocks by blasting and discharging (shedding) rocks and earth after blasting. In addition, in order to protect workers from the rocks and blast waves that are scattered during blasting, inside tunnels under construction, designated areas are placed from the excavation site (face 100A) where blasting explosives are installed to the tunnel entrance (gate 100B). A protective wall 101 is provided at a position set back by a distance (for example, 40 to 50 m). In the tunnel under construction, a protective wall is installed so that as the tunnel is dug, the protective wall 101 can be moved toward the back of the tunnel while maintaining a constant distance from the face 100A. 101 is movably supported by rails (not shown) laid in the tunnel.

In this embodiment, the protective wall 101 is a travel clean curtain formed by inflating a balloon. Note that in FIGS. 1 and 2, illustration of the balloon is omitted, and only the holding frame 101A that holds the balloon is shown. Note that the protective wall 101 is not limited to a travel clean curtain, and may be changed to various types of walls that can protect workers from rocks and blast waves scattered during blasting, such as an openable door.

At the construction site of such a tunnel, the area from the face 100A to the protective wall 101 is dangerous because it is an area where the impact of rock scattering and blast waves is large during blasting. This area is dangerous because it is an area where heavy machinery such as excavators, wheel loaders, and dump trucks are used to scrape up and transport rocks and dirt (hereinafter, this area will be referred to as "dangerous area Rd"). In addition, the heavy machinery working in the dangerous area Rd is not limited to vehicle-type heavy machinery such as excavators, wheel loaders, and dump trucks, but also stationary heavy machinery such as belt conveyors installed at construction sites, and heavy machinery such as workers and others at construction sites. This also includes work vehicles that transport materials.

On the other hand, the area from the protective wall 101 to the mine entrance 100B is safe because it is protected from scattering rocks and blast waves by the protective wall 101 during blasting. This area is relatively safe for workers because it is an area where almost no work is done with heavy machinery other than through traffic (hereinafter, this area will be referred to as the "safety area Rs").

The above-mentioned dangerous area Rd is such that during blasting, it is dangerous for workers to be in that area, and when a worker dismounts from the heavy equipment within that area, If a worker enters without riding the heavy equipment, there is a risk of contact with the heavy equipment being worked on, which is dangerous for the worker.

Therefore, in this embodiment, a safety control system is applied to a construction site where such a dangerous area Rd exists, thereby achieving high safety at the construction site. The details of the safety control system will be specifically explained below.

[1-2] Configuration of safety control system FIG. 3 is a block diagram conceptually showing the configuration of the safety control system applied to the tunnel construction site described above. The safety control system is composed of a position detection system 1 that detects the respective positions of workers and heavy equipment, a lighting control system 2, a heavy equipment control system 3, and a management server 4, which are connected via a network. are connected for communication.

<Position detection system>
The position detection system 1 is a system used to detect the positions of workers and heavy machinery, and is composed of a transmitter 11 that transmits a beacon signal and a receiver 12 that receives the beacon signal (see FIG. 3). .

The transmitters 11 include a transmitter 11A that is attached to a worker (for example, wearing a helmet or work clothes) working at a construction site, and a transmitter 11B that is attached to heavy machinery that works at the construction site. The beacon signal transmitted by each transmitter 11 includes first identification information Ip1 for identifying the transmitter 11. Here, the first identification information Ip1 is associated with each worker and heavy machine in a one-to-one relationship, and is used to identify which worker or heavy machine the beacon signal is transmitted from. used. Note that the worker may carry the transmitter 11 in his pocket or the like.

The receiver 12 includes a receiver 12A (see FIGS. 1 and 2) installed on the inner wall of the tunnel in the safety area Rs, and a receiver 12B (see FIG. 3) installed on heavy equipment working at a construction site. include. Each receiver 12 has second identification information Ip2 for identifying the receiver 12, and the second identification information Ip2 includes the position of the receiver 12 and the area corresponding to the position (in this embodiment). In the form, it is used when specifying a detection area Q), which will be described later.

In this embodiment, one or more detection areas Q are set in the safety area Rs by dividing the safety area Rs at predetermined intervals from the mine entrance 100B (see FIGS. 1 and 2). In FIG. 2, the detection areas Q are numbered in order, with the one closest to the wellhead 100B being the first (n=1). The receiver 12A determines, for each detection area Q, that the reception intensity of the beacon signal transmitted by a worker or heavy machinery (the transmitter 11 attached to them) that has entered the detection area Q is different from that of other detection areas Q. It is installed on the inner wall of the tunnel so as to be higher than the installed receiver 12A. That is, the receiver 12A is installed for each detection area Q in a one-to-one correspondence with that detection area Q. In the example of FIG. 2, the receiver 12A is installed at or near the center of each detection area Q on one side of the inner wall of the tunnel (in FIG. 2, the right side when looking inside the tunnel from the tunnel entrance 100B). has been done.

Therefore, when a beacon signal transmitted from any one of the sources (workers and heavy equipment) within the safety area Rs is received by one or more receivers 12A, the beacon signal is received. By extracting the receiver 12A with the highest reception strength and specifying the detection area Q corresponding to the receiver 12 based on the second identification information Ip2 for identifying the extracted receiver 12. , it becomes possible to detect in which detection region Q the position of the source of the beacon signal is located (source position detection). Furthermore, it becomes possible to specify which worker or heavy equipment is the source of the transmission based on the first identification information Ip1 included in the beacon signal (identification of the source).

Note that the receiver 12A may be installed on the left side surface or may be installed on the ceiling. Moreover, the receiver 12A may be installed on both the right side and the left side in each of the detection areas Q. When the receivers 12A are installed on both sides in this manner, the reception accuracy of the beacon signal in each receiver 12A is improved. Further, according to the second identification information Ip2 obtained from each receiver 12A, it is not only possible to specify which detection region Q the receiver 12A corresponds to, but also to identify which detection area Q the receiver 12A corresponds to. It becomes possible to specify whether the area corresponds to the area on the right side or the area on the left side of the center line of the detection area Q, and the accuracy of position detection is improved.

The receiver 12B is installed at a predetermined position in each of the heavy machines (see FIG. 3). Here, the predetermined position is a position where a beacon signal transmitted by the worker can be received when the worker is riding on the heavy equipment, and where the reception strength at that time is relatively high.

Therefore, when the receiver 12B receives a beacon signal, it is possible to specify which heavy equipment received the beacon signal based on the second identification information Ip2 for identifying the receiver 12B. (Identification of heavy machinery). Furthermore, based on the reception strength at that time, it becomes possible to determine whether or not the worker who is the source of the beacon signal is riding on the heavy machine (detection of the worker riding on the heavy machine). Furthermore, by determining whether the worker is on the machine or not after determining that the worker is on the machine, it is possible to determine whether the worker is still on the machine or whether the worker has disembarked from the machine. (detection of worker disembarking from heavy machinery).

In this way, in the safety control system of this embodiment, the receiver 12 (receivers 12A and 12B) receives the beacon signal transmitted by the worker, and the position of the worker is detected based on the beacon signal. It can be said that the receiver 12 functions as a worker detection unit that detects the position of each worker working at the construction site. In addition, the receiver 12A receives a beacon signal transmitted by heavy machinery, and the position of the heavy machinery is detected based on the beacon signal. It can be said that it also functions as a heavy equipment detection unit that detects.

Furthermore, in this embodiment, a communication relay 102A (gateway, etc.) that relays communication between the receiver 12A and the network is installed on the inner wall of the tunnel in the safety area Rs so that the receiver 12A can be connected to the network. is set up. Specifically, one communication repeater 102A is arranged for every two receivers 12A so that all the receivers 12A can be connected to the network. Note that one communication repeater 102A may be arranged for three or more receivers 12A. In addition, each heavy machine is further equipped with a communication repeater 102B (such as a gateway) that relays communication between the receiver 12B and the network so that the receiver 12B installed in the heavy machine can connect to the network. is set up. Thereby, the receivers 12A and 12B are capable of network communication with the management server 4.

When the receiver 12 (receivers 12A and 12B) receives a beacon signal, the receiver 12 (receivers 12A and 12B) uses the reception strength at that time, the first identification information Ip1 included in the beacon signal, and the information for identifying itself. The second identification information Ip2 is transmitted to the management server 4. Based on the information transmitted from the receiver 12 (reception strength, first identification information Ip1, second identification information Ip2), the management server 4 identifies the above-mentioned source, detects the location of the source, and identifies the location of the heavy equipment. identification, detection of a worker getting on the heavy machinery, detection of a worker getting off the heavy machinery, etc. Note that details of the management server 4 will be described later.

<Lighting control system>
The lighting control system 2 is a system used for illuminating the dangerous area Rd, and includes a work lighting device 21 that illuminates the dangerous area Rd with light in a color suitable for the work (e.g., white) and a warning color (e.g., white). The warning lighting device 22 is configured to illuminate the dangerous area Rd with light (red, etc.), and a control device 23 is to control these lighting devices (see FIGS. 1 to 3). Further, a communication relay 102C (gateway, etc.) that relays communication between the control device 23 and the network is connected to the control device 23 (see FIG. 3). This allows the control device 23 to communicate with the management server 4 over the network.

The work lighting device 21 and the warning lighting device 22 are fixed to the holding frame 101A of the protective wall 101. In this embodiment, the protective wall 101 is a travel clean curtain formed by inflating a balloon, and the work lighting device 21 and the warning lighting device 22 are equipped with explosives for blasting when the balloon is inflated. The balloon is located at a position shifted toward the safety area Rs from the place where the balloon is inflated and deflated so as to be hidden by the balloon from the excavation site (face 100A) where the balloon is inflated and deflated. Note that even when the protective wall 101 is a wall other than a travel clean curtain, the work lighting device 21 and the warning lighting device 22 are hidden from the excavation site (face 100A) by the door when the protective wall 101 is closed. It may be attached to the protective wall 101 as shown in FIG.

The control device 23 is a control panel including, for example, a PLC (Programmable Logic Controller), and controls the lighting operations of the work lighting device 21 and the warning lighting device 22 in accordance with commands from the management server 4.

Specifically, the control device 23 brightly illuminates the dangerous area Rd by lighting the work lighting device 21 according to a command from the management server 4. This improves visibility in the dangerous area Rd and facilitates work in the dangerous area Rd. Note that the work lighting device 21 may be a lighting device that can be forcibly turned on by a switch operation or the like by the worker.

Further, the control device 23 issues a warning into the dangerous area Rd by causing the warning lighting device 22 to start lighting or blinking in accordance with a command from the management server 4 (warning start command). As a result, workers who are working on heavy machinery in dangerous area Rd are notified that danger has occurred within the construction site (such as workers entering dangerous area Rd without riding heavy machinery, This makes it possible to notify people that a worker has disembarked from a heavy machine while on the road, and to call for attention.

Note that a warning speaker (not shown) or the like may be further attached to the protective wall 101 to emit a warning sound toward the dangerous area Rd. In this case, the control device 23 can issue a warning into the dangerous area Rd by emitting a warning sound from the warning speaker in accordance with a command from the management server 4. Note that the warning sound may be emitted instead of lighting or flashing the warning lighting device 22, or may be emitted together with the lighting or flashing of the warning lighting device 22.

<Heavy equipment control system>
The heavy machinery control system 3 is a system provided in each heavy machinery and used to control the heavy machinery (see FIG. 3). In this embodiment, the heavy machinery control system 3 mainly provides a warning to workers working on other heavy machinery in the dangerous area Rd when a worker gets off the heavy machinery in the dangerous area Rd. This control is used to issue warnings to users. The heavy equipment control system 3 includes a warning device 31 that issues a warning to the surroundings, and a control device 32 that controls the warning device 31.

The warning device 31 is a device (for example, a red light, etc.) that warns the surroundings with light of a warning color (for example, red, etc.), and is placed in a position that is conspicuous when the heavy machine is viewed from the outside. (for example, installed on the ceiling of heavy equipment). Note that the warning device 31 is not limited to a device that issues a warning using warning-colored light, but may be a device that emits a warning sound (for example, a speaker).

The control device 32 is, for example, a control panel including a PLC. Further, the control device 32 is mounted on each heavy machine and is connected to a communication repeater 102B installed in the heavy machine. This allows the control device 32 to communicate with the management server 4 over the network. In addition, regarding the relationship between the control device 32 and the management server 4, the control device 32 is understood to be the first control section installed in each of the heavy equipment, and the management server 4 is capable of network communication with the first control section. It can be understood as a second control section.

In each heavy machine, the control device 32 causes the warning device 31 to start a warning operation according to a command from the management server 4 (warning start command), thereby issuing a warning to the surrounding area of the heavy machine in the dangerous area Rd. . This notifies workers who are working on other heavy equipment within the danger area Rd that a danger has occurred within the construction site (such as a worker disembarking from the heavy equipment within the danger area Rd). It becomes possible to call for attention.

Here, it is difficult to install a communication repeater (for example, a gateway) for network communication in the dangerous area Rd at the tunnel construction site. This is because Danger Area Rd is an area where the impact of rock scattering and blast waves is large during blasting, so if a communication repeater is installed, there is a possibility that the communication repeater will malfunction due to rock scattering and blast waves. This is because it is expensive. In such a situation where it is difficult to install a communication repeater in the dangerous area Rd, the radio wave condition in the dangerous area Rd becomes poor and the control device 32 of each heavy machine working in the dangerous area Rd is managed. It becomes difficult to remotely control the server 4. For this reason, even if a worker dismounts from a heavy machine within the dangerous area Rd, it is not necessarily possible to detect this on the management server 4 and warn other heavy machines, making it difficult to ensure the safety of workers at the construction site. becomes difficult.

Therefore, in this embodiment, the control device 32 not only performs heteronomous control that controls the warning device 31 according to commands from the management server 4 (that is, heteronomous control based on commands from the management server 4), but also performs management It is possible to perform autonomous control to control the warning device 31 independently (autonomously) from the server 4. The control device 32 is capable of switching between heteronomous control and autonomous control, and controls the warning device 31 according to the position of the heavy equipment on which the control device 32 is mounted or the radio wave condition of network communication. is switched between heteronomous control and autonomous control (switching process).

Here, when heteronomous control is selected, information from the receiver 12B (reception strength, first identification information Ip1, second identification information Ip2) is transmitted to the management server 4 via the communication relay 102B. . The management server 4 determines whether the worker has disembarked from the heavy equipment based on the information received from the receiver 12B (received information). When the management server 4 determines that the heavy machine has "disembarked," it transmits a command (warning start command) to the control device 32 mounted on the heavy machine to control the warning device 31. The control device 32 issues a warning to the surroundings of the heavy machine in the dangerous area Rd by causing the warning device 31 to start a warning operation in accordance with a command (warning start command) from the management server 4.

On the other hand, when autonomous control is selected, the information from the receiver 12B (reception strength, first identification information Ip1, second identification information Ip2) is transmitted to the control device 32, and the control device 32 receives the information from the receiver 12B. Based on the received information (received information), it is determined whether the worker has disembarked from the heavy equipment. When the control device 32 determines that the vehicle has been disembarked, the control device 32 causes the warning device 31 to start a warning operation, thereby issuing a warning to those around the heavy machine in the dangerous area Rd.

In this way, switching between heteronomous control and autonomous control is performed according to the location of the heavy equipment or the radio wave status of network communication, so that when a worker gets off the heavy equipment in the dangerous area Rd, the work This makes it possible to reliably detect when a worker gets off the vehicle and to issue a warning to workers riding on other heavy machinery.

The above-mentioned autonomous control and heteronomous control, as well as their switching processing, may be executed by a processing unit configured by hardware by constructing a circuit within the control device 32, or by a PLC or a processing unit included in the control device 32. The program may be executed by a processing unit configured with software by causing a processing device such as a CPU to execute the program. The program may be stored in a readable state in a portable storage device (for example, a flash memory, etc.), or may be stored in a downloadable manner in another server, and the downloaded program is transferred to the control device 32. may be stored in a storage unit (not shown).

<Management server>
The management server 4 (see Figure 3) remotely monitors the positions of workers and heavy equipment at a construction site using network communication, and detects the risk of contact between workers and heavy equipment within the dangerous area Rd of the construction site. If this occurs, a warning will be given to those in the dangerous area Rd.

Specifically, the management server 4 includes first correspondence data D1 and second correspondence data D2 in order to remotely monitor the positions of workers and heavy machinery at a construction site. Here, in the first correspondence data D1, for each transmitter 11, first identification information Ip1 for identifying the transmitter 11 and information (such as name and numbers, etc.) and are associated with each other. In addition, the second correspondence data D2 includes, for each receiver 12, second identification information Ip2 for identifying the receiver 12, and the installation position of the receiver 12 (detection area Q corresponding to the receiver 12A, The receiver 12B is associated with location information (such as a number) that can identify the heavy equipment (heavy equipment) where the receiver 12B is installed.

Then, when the management server 4 receives the information (reception strength, first identification information Ip1, second identification information Ip2) from the receiver 12, the management server 4 uses the received information (reception information) and the first identification information based on the information. Using the correspondence data D1 and various information appropriately read from the second correspondence data D2, it is possible to identify the source, detect the position of the source, identify the heavy machinery, detect that a worker is riding on the heavy machinery, and detect the location of the heavy machinery. Detects when a worker gets off the vehicle (detection process).

Further, the management server 4 executes the above-mentioned detection process for each worker and determines whether the worker is within the safe area Rs or whether the worker is safe within the dangerous area Rd based on the detection result obtained by the detection process. (judgment process). When the management server 4 determines that at least one of the workers is "not in the safe area Rs" or "not in a safe place in the dangerous area Rd," the management server 4 By issuing a warning, workers working on heavy machinery in the dangerous area Rd are notified of the occurrence of danger within the construction site and are urged to be careful (warning process).

Furthermore, the management server 4 executes the above-described detection process for each heavy machine and determines whether the heavy machine has entered the dangerous area Rd based on the detection result obtained in the detection process (judgment process). When the management server 4 determines that at least one of the heavy machines has "entered the dangerous area Rd," the management server 4 sends the determination result (in this embodiment, a switching start signal as the determination result). , and is transmitted to the control device 32 mounted on the heavy equipment. When the control device 32 receives the switching start signal (judgment result) from the management server 4, the control device 32 switches the heavy equipment on which the control device 32 is installed at least until the network communication with the management server 4 is disconnected. control (control for the warning device 31) is switched from heteronomous control to autonomous control.

The detection processing, judgment processing, and warning processing described above are respectively executed by the detection processing section 41, the judgment processing section 42, and the warning processing section 43 in the management server 4 (see FIG. 3). These processing units may be configured with hardware by constructing a circuit within the management server 4, or may be configured with software by causing a processing device such as a CPU included in the management server 4 to execute a program. good. The program may be stored in a readable state in a portable storage device (for example, a flash memory, etc.), or may be stored in a downloadable manner on another server, and the downloaded program may be stored on the management server 4. may be stored in a storage unit (not shown).

[1-3] Control processing executed by the safety control system The control processing executed by the above-mentioned safety control system will be explained using a flowchart. 4A and 4B are flowcharts showing a control process (hereinafter referred to as "first safety control process") executed by the management server 4. FIG. 5 is a flowchart showing a control process (hereinafter referred to as "second safety control process") executed by the control device 32 mounted on each heavy machine.

<First safety control process>
The first safety control process (see FIGS. 4A and 4B) is started by the management server 4 when a worker enters the construction site (for example, when the entry to the construction site is recorded by a reading device, etc.) . When the first safety control process is started, the management server 4 determines the source of the beacon signal (work While the detection processing unit 41 identifies the source (persons and heavy machinery) and detects the location of the source, the following process shown in FIGS. 4A and 4B is executed for each worker, thereby identifying workers at the construction site. Monitor.

Here, the first safety control process is for ensuring the safety of the worker when there is a risk of the worker coming into contact with heavy machinery within the dangerous area Rd. As a premise for such a danger to occur, it is necessary that heavy machinery exists within the danger area Rd. Therefore, first, the determination processing section 42 determines whether or not the heavy machinery exists within the dangerous area Rd, based on the detection result obtained from the detection processing section 41 for each heavy machinery in the construction site (step S101). If the determination processing unit 42 determines in step S101 that it does not exist (No), it is determined that there is no risk of the worker coming into contact with heavy machinery within the dangerous area Rd at this time. I can judge.

On the other hand, if the determination processing unit 42 determines in step S101 that "exists (Yes)", it means that there is a risk that the worker will come into contact with heavy equipment in the dangerous area Rd. It can be determined that there is. Therefore, in order to determine whether or not such a danger has occurred, the determination processing unit 42 further determines whether or not the worker is the worker being monitored based on the detection results obtained from the detection processing unit 41 regarding the worker who is being monitored at that time. It is determined whether the vehicle enters the dangerous area Rd from the safe area Rs (step S102). Note that in step S102, the determination processing unit 42 may determine whether the worker is within the safe area Rs instead of determining whether the worker has entered the dangerous area Rd.

If the determination processing unit 42 determines in step S102 that the person is not inside (No) (or that the person is within the safe area Rs (Yes)), Based on the judgment, it can be determined that there is currently no danger of workers coming into contact with heavy machinery within the danger area Rd.

On the other hand, if the determination processing unit 42 determines in step S102 that the vehicle has entered (Yes) (or that it is not within the safe area Rs (No)), Based on this determination, if the worker is not riding on the heavy machine, it can be determined that there is a risk of the worker coming into contact with the heavy machine within the danger area Rd.

Therefore, when the determination processing unit 42 determines that the worker has entered (Yes) in step S102, the determination processing unit 42 further detects the detection information obtained from the detection processing unit 41 regarding the worker who is the monitoring target at that time. Based on the result, it is determined whether the worker is riding on heavy machinery (step S103).

If the determination processing unit 42 determines in step S103 that the worker is not on board (No), it can be determined that the worker has entered the dangerous area Rd without riding on the heavy equipment. Therefore, it can be determined that there is a risk of the worker coming into contact with heavy machinery within the dangerous area Rd.

Therefore, if the determination processing unit 42 determines in step S103 that the vehicle is not in the vehicle (No), the warning processing unit 43 issues a warning to the lighting control system 2 to warn the user within the dangerous area Rd. A command signal (warning start signal) for causing the illumination control system 2 is transmitted to the control device 23 of the lighting control system 2 (step S104). When the control device 23 receives the warning start signal from the management server 4, it issues a warning into the dangerous area Rd by lighting or blinking the warning lighting device 22.

According to such a warning within the dangerous area Rd, a worker working on a heavy machine in the dangerous area Rd is notified that a danger has occurred at the construction site (a worker is working on a heavy machine in the dangerous area Rd). It is possible to warn the driver by informing the driver that the driver entered the vehicle without boarding the vehicle. If a worker working on a heavy machine inside the danger area Rd is alerted by the above warning, the worker stops the heavy machine and interrupts the work, for example, and enters the danger area Rd. Contact with workers can be avoided. Therefore, high safety at construction sites is achieved.

Thereafter, the determination processing unit 42 determines whether or not the worker has returned to the safety area Rs, based on the detection result obtained from the detection processing unit 41 regarding the worker who is the monitoring target at that time (step S105). . If the determination processing unit 42 determines in step S105 that the operator has returned (Yes), it can be determined that there is no longer any danger of the worker coming into contact with heavy machinery within the dangerous area Rd. .

Therefore, if the determination processing unit 42 determines in step S105 that it has returned (Yes), the warning processing unit 43 instructs the control device 23 of the lighting control system 2 to stop issuing a warning to the inside of the dangerous area Rd. A command signal (warning stop signal) to cause the alarm to stop is transmitted (step S106). When the control device 23 receives the warning stop signal from the management server 4, the control device 23 stops issuing a warning to the dangerous area Rd by stopping the lighting or blinking of the warning lighting device 22.

On the other hand, if the determination processing unit 42 determines in step S105 that the operator has not returned (No), the operator remains in the dangerous area Rd, and It can be determined that the risk of the worker coming into contact with heavy machinery continues. In that case, since it is preferable to continue the warning within the dangerous area Rd, the determination processing unit 42 does not send the warning until step S106 (transmission of the warning stop signal) can be executed (that is, in step S105 (Yes)), step S105 is repeatedly executed.

In this process flow, a determination is made that "does not exist (No)" in step S101, "does not exist (No)" in step S102, and "returns (Yes)" in step S105. In this case, based on these judgments, it can be determined that there is no risk of the worker coming into contact with the heavy machinery within the dangerous area Rd at this time.

In this case, the determination processing unit 42 determines whether or not the worker who is currently being monitored has left the construction site in order to determine whether or not to continue monitoring the worker who is the monitoring target at that time (step S115). . If the determination processing unit 42 determines in step S115 that the worker has not left (No), the management server 4 continues to monitor the worker by executing the process from step S101 again. do. On the other hand, if the determination processing unit 42 determines in step S115 that the worker has left (Yes), the management server 4 ends the monitoring of the worker who has left (end of the first safety control process).

If the determination processing unit 42 determines in step S103 that the worker is riding (No), it can be determined that the worker has entered the dangerous area Rd on a heavy machine, and therefore, It can be determined that the worker is in a safe place within the dangerous area Rd. Therefore, in that case, there is no need to issue a warning into the dangerous area Rd. On the other hand, even if a worker enters the dangerous area Rd on a heavy machine, there is a possibility that the worker will get off the heavy machine if the heavy machine breaks down within the dangerous area Rd. When a worker gets off the heavy machine in the dangerous area Rd, there is a risk that the worker will come into contact with other heavy machines in the dangerous area Rd. In that case, a warning within the dangerous area Rd is required.

However, if the heavy machinery enters the dangerous area Rd, the radio wave condition of network communication deteriorates, so the management server 4 detects the disembarkation of the worker even if the worker dismounts from the heavy machinery within the dangerous area Rd. Therefore, a situation may arise in which the management server 4 cannot issue a command to start issuing a warning to the dangerous area Rd.

Therefore, when a heavy machine enters the dangerous area Rd, the management server 4 allows the operator to enter the dangerous area Rd so that the control device 32 mounted on the heavy machine can perform autonomous control. When it is detected that someone has entered the machine, a command signal (switching start signal) to enable switching from heteronomous control to autonomous control is transmitted to the control device 32 mounted on the heavy equipment (step S107). Then, by receiving the switching start signal, the control device 32 performs heterogeneous control of the heavy machinery (in this embodiment, control of the warning device 31) at least until the network communication with the management server 4 is disconnected. It becomes possible to switch from controlled to autonomous control. Note that details of the control process (second safety control process) executed by the control device 32 will be described later.

After step S107, the management server 4 determines whether information (reception strength, first identification information Ip1, second identification information Ip2) can be received from the receiver 12B installed on the heavy equipment that has entered the dangerous area Rd. A judgment is made (step S108). Here, when the radio wave condition of network communication deteriorates and the control device 32 switches the control of the heavy equipment from heteronomous control to autonomous control (when autonomous control is selected), the information from the receiver 12B is Since the information is transmitted to the control device 32, the management server 4 can no longer receive information from the receiver 12B. Therefore, when the management server 4 determines in step S108 that it cannot receive (No), it can be determined that the control device 32 has switched from heteronomous control to autonomous control.

Therefore, if the management server 4 determines that "reception is not possible (No)" in step S108, the management server 4 issues a warning to the dangerous area Rd when the worker gets off the heavy equipment within the dangerous area Rd. The processing (judgment processing and warning processing) is entrusted to the autonomous control performed by the control device 32, and step S108 is repeatedly executed until the information from the receiver 12B can be received again. On the other hand, if the management server 4 determines in step S108 that it "can receive" (Yes), it performs the above process itself. Specifically, it is as follows.

If the management server 4 determines in step S108 that it is “receivable (Yes),” the determination processing unit 42 further performs a process based on the detection result obtained from the detection processing unit 41 regarding the worker who is the monitoring target at that time. Then, it is determined whether the worker has gotten off the heavy machine (step S109). Note that in step S109, the determination processing unit 42 may determine whether the worker is on the heavy machine instead of determining whether the worker has gotten off the heavy machine.

Then, in step S109, when the determination processing unit 42 determines that the driver has gotten off the vehicle (Yes) (or has determined that the vehicle has not gotten on the vehicle (No)), the determination processing unit 42 Accordingly, it can be determined that the worker is not in a safe place within the dangerous area Rd, and therefore, it can be determined that there is a risk of the worker coming into contact with heavy machinery within the dangerous area Rd.

Therefore, if the determination processing unit 42 determines in step S109 that the worker has disembarked (Yes), the warning processing unit 43 determines whether the worker to be monitored at that time is mounted on the heavy equipment. A command signal (warning start signal) for issuing a warning into the dangerous area Rd is transmitted to the control device 32 located in the dangerous area Rd (step S110). When the control device 32 receives the warning start signal from the management server 4, the control device 32 causes the warning device 31 to start a warning operation, thereby issuing a warning to the surroundings of the heavy machine in the dangerous area Rd.

According to such a warning within the dangerous area Rd, a worker working on a heavy machine in the dangerous area Rd is informed that a danger has occurred within the construction site (a worker is working inside the dangerous area Rd). It is possible to warn the driver by informing the operator that the operator has disembarked from heavy equipment. If a worker working on a heavy machine in the danger area Rd is alerted by the above-mentioned warning, he or she should, for example, stop the heavy machine and interrupt the work, thereby removing the heavy machine from the danger area Rd. Contact with workers who have disembarked can be avoided. Therefore, high safety at construction sites is achieved.

Note that in step S110, the warning processing unit 43 may also transmit a warning start signal to the control device 23 of the lighting control system 2. When the control device 23 receives the warning start signal from the management server 4, the control device 23 may issue a warning into the dangerous area Rd by lighting or blinking the warning lighting device 22. This makes it possible to reliably notify workers who are working on heavy machinery in the dangerous area Rd that a danger has occurred within the construction site.

After step S110, the determination processing unit 42 determines whether or not the worker has boarded the heavy machinery again, based on the detection result obtained from the detection processing unit 41 regarding the worker who is the monitoring target at that time ( Step S111). If the determination processing unit 42 determines in step S111 that the worker has boarded the vehicle again (Yes), it is determined that there is no longer any danger of the worker coming into contact with heavy machinery within the dangerous area Rd. can.

Therefore, if the determination processing unit 42 determines in step S111 that the person has boarded the vehicle again (Yes), the warning processing unit 43 causes the control device 32 mounted on the heavy equipment to issue a warning to the danger area Rd. A command signal (warning stop signal) for stopping is transmitted (step S112). When the control device 32 receives the warning stop signal from the management server 4, the control device 32 causes the warning device 31 to stop the warning operation, thereby stopping the warning within the dangerous area Rd. After that, the management server 4 executes the process from step S108 again in order to continue monitoring the worker.

Note that in step S112, the warning processing unit 43 may also send a warning stop signal to the control device 23 of the lighting control system 2. When the control device 23 receives the warning stop signal from the management server 4, the control device 23 may stop issuing a warning to the dangerous area Rd by stopping the lighting or blinking of the warning lighting device 22.

On the other hand, if the determination processing unit 42 determines in step S111 that the operator is not getting on the machine again (No), it means that the operator remains in the state of dismounting from the heavy equipment and is in a dangerous area. It can be determined that there is a continuing risk of the worker coming into contact with heavy machinery within the Rd. In that case, since it is preferable to continue the warning within the dangerous area Rd, the determination processing unit 42 does not proceed until step S112 (transmission of a warning stop signal) can be executed (i.e., in step S111, "re-board the vehicle again"). Step S111 is repeatedly executed until it is determined that the process has been completed (Yes).

If the determination processing unit 42 determines in step S109 that the driver has not alighted the vehicle (No) (or has determined that the vehicle has boarded the vehicle (Yes)), the determination Therefore, it can be determined that there is currently no danger of workers coming into contact with heavy machinery within the danger area Rd. In this case, the determination processing unit 42 determines whether the heavy machinery on which the worker who is currently being monitored is riding has returned to the safety area Rs (step S113).

Here, when the heavy equipment returns to the safety area Rs, the radio wave condition of network communication improves. Therefore, when the determination processing unit 42 determines in step S113 that it has returned (Yes), the management server 4 sends the control device 32 mounted on the heavy equipment that has returned to the safety area Rs to A command signal (switching stop signal) for suppressing switching from heteronomous control to autonomous control is transmitted (step S114). When the control device 32 receives the switching stop signal, the control device 32 returns to the state in which it controls the heavy machinery (in this embodiment, controls the warning device 31) only by heteronomous control. On the other hand, if the determination processing unit 42 determines in step S113 that the worker has not returned (No), the management server 4 re-executes the process from step S108 in order to continue monitoring the worker. do.

<Second safety control process>
The second safety control process (see FIG. 5) is started by the control device 32 mounted on the heavy machine when the engine of the heavy machine starts at the construction site (including when the heavy machine enters the construction site). When the second safety control process is started, the control device 32 first determines whether a switching start signal (see step S107 in FIG. 4B) has been received from the management server 4 (step S201).

If the control device 32 determines in step S201 that it has been received (Yes), the control device 32 switches the control of the heavy machinery (in this embodiment, the control of the warning device 31) from heteronomous control to autonomous control. becomes possible. On the other hand, if the control device 32 determines in step S201 that the signal has not been received (No), the control device 32 performs heteronomous control over the heavy machinery. In FIG. 5, the autonomous control consists of the processes of steps S203 to S208, and the heteronomous control consists of the processes of steps S209 to S212. Specifically, it is as follows.

If the control device 32 determines in step S201 that it has been received (Yes), it further determines whether the radio wave condition for network communication has deteriorated (step S202). Here, if the radio wave condition for network communication deteriorates, it becomes difficult to communicate with the management server 4, and there is a high possibility that it becomes difficult to control the heavy machinery by heteronomous control.

Therefore, when the control device 32 determines in step S202 that the condition has deteriorated (Yes), the control device 32 switches the control of the heavy machinery from heteronomous control to autonomous control (steps S203 to S208). On the other hand, if the control device 32 determines in step S202 that there is no deterioration (No), the control device 32 performs heteronomous control on the heavy machinery.

In the autonomous control, the control device 32 determines whether the worker has gotten off the heavy equipment based on the information from the receiver 12B (reception strength, first identification information Ip1, second identification information Ip2) (step S203). Note that in step S203, the control device 32 may determine whether the worker is on the heavy machine instead of determining whether the worker has gotten off the heavy machine.

Then, if the control device 32 determines in step S203 that the driver has gotten off the vehicle (Yes) (or has determined that the vehicle has not gotten on the vehicle (No)), based on that determination, , it can be determined that the worker is not in a safe place within the dangerous area Rd, and therefore, it can be determined that there is a risk of the worker coming into contact with heavy machinery within the dangerous area Rd.

Therefore, when the control device 32 determines in step S203 that the driver has gotten off the vehicle (Yes) (or that the vehicle has not gotten on the vehicle (No)), the controller 32 causes the warning device 31 to start a warning operation. By doing so, a warning is given to those around the heavy machinery in the dangerous area Rd (step S204).

According to such a warning within the dangerous area Rd, a worker working on a heavy machine in the dangerous area Rd is informed that a danger has occurred within the construction site (a worker is working inside the dangerous area Rd). It is possible to warn the driver by informing the operator that the operator has disembarked from heavy equipment. If a worker working on a heavy machine in the danger area Rd is alerted by the above-mentioned warning, he or she should, for example, stop the heavy machine and interrupt the work, thereby removing the heavy machine from the danger area Rd. Contact with workers who have disembarked can be avoided. Therefore, high safety at construction sites is achieved.

Thereafter, the control device 32 determines whether the worker has boarded the heavy equipment again based on the information from the receiver 12B (reception strength, first identification information Ip1, second identification information Ip2) (step S205 ). If the control device 32 determines in step S205 that the worker has boarded the vehicle again (Yes), it can be determined that there is no longer any risk of the worker coming into contact with heavy machinery within the dangerous area Rd. .

Therefore, if it is determined in step S205 that the user has boarded the vehicle again (Yes), the control device 32 causes the warning device 31 to stop the warning operation, thereby stopping warning to the inside of the danger area Rd (step S205). S206). After that, the control device 32 moves to step S207.

On the other hand, if the control device 32 determines in step S205 that the operator is not getting on the machine again (No), then based on that determination, the worker remains in the state of dismounting from the heavy equipment, and the dangerous area Rd. It can be determined that there is a continuing risk of the worker coming into contact with heavy machinery within the area. In that case, since it is preferable to continue the warning to the inside of the dangerous area Rd, the control device 32 does not control the warning until step S206 (stopping the warning operation) can be executed (that is, in step S205, the controller 32 does not allow the user to board the vehicle again). Step S205 is repeatedly executed until it is determined that the result is "Yes)".

If the control device 32 determines in step S203 that the driver has not gotten off the vehicle (No) (or has determined that the vehicle has boarded the vehicle (Yes)), then At present, it can be determined that there is no risk of workers coming into contact with heavy machinery within the danger area Rd. In this case, since the control device 32 does not need to issue a warning (steps S204 to S206) into the dangerous area Rd, the process proceeds to step S207.

In step S207, the control device 32 determines whether a switching stop signal (see step S114 in FIG. 4B) has been received from the management server 4. If the control device 32 determines in step S207 that the message has been received (Yes), the control device 32 returns to the state in which the heavy machinery is controlled only by heteronomous control, and proceeds to step S213.

In step S213, the control device 32 determines whether the engine of the heavy machinery has stopped at the construction site (including when the heavy machinery has left the construction site). If the control device 32 determines in step S213 that the engine is not stopped (No), it executes the process from step S201 again. On the other hand, if the control device 32 determines in step S213 that "the engine has stopped (Yes)", it ends the control process (second safety control process).

If the control device 32 determines in step S207 that it has not received the signal (No), the control device 32 continues to be able to switch between autonomous control and heteronomous control. Become. Therefore, the control device 32 determines whether or not the radio wave condition of network communication has recovered in order to perform switching according to the radio wave condition of network communication (step S208).

If the control device 32 determines in step S208 that the machine has recovered (Yes), it switches the control of the heavy machinery from autonomous control to heteronomous control. On the other hand, if the control device 32 determines in step S208 that it has not recovered (No), the control device 32 maintains the control of the heavy equipment as autonomous control, and re-executes the processing from step S203.

In heteronomous control, the control device 32 determines whether a warning start signal has been received from the management server 4 (step S209). Then, when the control device 32 determines in step S209 that the message has not been received (No), the process returns to step S201. On the other hand, if the control device 32 determines that it has been received (Yes) in step S209, it causes the warning device 31 to start a warning operation to warn the surroundings of the heavy equipment in the dangerous area Rd. (Step S210). According to such a warning within the dangerous area Rd, a worker working on a heavy machine in the dangerous area Rd is informed that a danger has occurred within the construction site (a worker is working inside the dangerous area Rd). It is possible to warn the driver by informing the operator that the operator has disembarked from heavy equipment.

After that, the control device 32 determines whether a warning stop signal has been received from the management server 4 (step S211). If the control device 32 determines in step S211 that the message has been received (Yes), it can be determined that there is no longer any risk of the worker coming into contact with the heavy machinery within the dangerous area Rd.

Therefore, when the control device 32 determines in step S211 that it has been received (Yes), the control device 32 causes the warning device 31 to stop the warning operation, thereby stopping the warning within the dangerous area Rd. (Step S212). After that, the control device 32 moves to step S213.

On the other hand, if the control device 32 determines in step S211 that the signal has not been received (No), the operator remains in the state of dismounting the heavy equipment and is within the dangerous area Rd. It can be determined that there is a continuing risk of the worker coming into contact with heavy machinery. In that case, since it is preferable to continue the warning within the dangerous area Rd, the control device 32 does not receive the message "Received (Yes )"), step S211 is repeatedly executed.

According to such second safety control processing, even if the radio wave condition of network communication deteriorates due to heavy equipment entering the dangerous area Rd, autonomous control is changed from heteronomous control according to the position of the heavy equipment or the radio wave condition of network communication. Therefore, the disembarkation of the worker from the heavy machinery within the dangerous area Rd is reliably detected, and a warning to the inside of the dangerous area Rd is issued. Therefore, high safety at construction sites is achieved.

[2] Modified Examples [2-1] First Modified Example In the safety control system described above, of the receivers 12A installed in the safe area Rs, the receiver 12A installed near the boundary with the dangerous area Rd is A directional receiver 12C having directivity in the receiving direction of the beacon signal may be installed at the position (see FIGS. 1 and 2).

As an example, the directional receiver 12C is installed so that it can receive only beacon signals transmitted from the direction toward the face 100A or the mine entrance 100B from its installation position. According to such a directional receiver 12C, the reception strength when the directional receiver 12C receives a beacon signal is proportional to the distance from the installation position of the directional receiver 12C in the above direction. . Therefore, the detection processing unit 41 of the management server 4 uses the information (reception strength, first identification information Ip1, second identification information Ip2) transmitted from the directional receiver 12C to identify the dangerous area Rd and the safe area. It becomes possible to detect the distance from the border with Rs to the source of the beacon signal (workers and heavy machinery).

Therefore, by using the detection result of the detection processing section 41, the judgment processing section 42 of the management server 4 can determine whether the worker in the safety area Rs approaches the boundary without riding the heavy machinery, It is possible to determine how far away the object is from the boundary. Furthermore, when the worker crosses the boundary and enters the dangerous area Rd, the determination processing unit 42 can determine how far the worker has invaded from the boundary (intrusion distance). .

Then, the warning processing unit 43 of the management server 4 can change the warning method for entering the dangerous area Rd in stages according to the degree of the distance determined by the determination processing unit 42. For example, the warning processing unit 43 may increase the illuminance of the warning lighting device 22 in stages as the distance from the boundary to the worker decreases, or may increase the blinking speed of the warning lighting device 22. You can go faster. Then, the warning processing unit 43 may maximize the illuminance and blinking speed of the warning lighting device 22 when the worker enters the dangerous area Rd. Further, the warning processing unit 43 increases the volume of the warning sound emitted from the warning speaker as the distance from the boundary to the worker decreases, and when the worker enters the dangerous area Rd, the warning processing unit 43 increases the volume of the warning sound emitted from the warning speaker. You can turn the volume up to maximum.

In addition, before and immediately after the worker enters the dangerous area Rd, only the worker is warned, and after the worker enters the dangerous area Rd, if the distance of the worker's entry increases, By issuing a warning within the danger area Rd, a worker working on a heavy machine within the danger area Rd may be notified of the occurrence of danger.

As a result, workers who are working on heavy machinery in dangerous area Rd are notified that there are workers who are trying to approach dangerous area Rd or heavy machinery in the dangerous area Rd without riding on heavy machinery. This makes it possible to alert the operator and alert them, as well as to inform them of how close the worker is. Therefore, a worker working on a heavy machine in the dangerous area Rd should be aware of the location of the worker who is attempting to enter the dangerous area Rd without permission, or who has entered the dangerous area Rd without permission. It becomes possible to change behavior in stages to avoid contact with workers (wait-and-see → slow down → suspend, etc.).

[2-2] Second modification In the above-mentioned safety control system, the positions of the respective sources (workers and heavy machinery) are not limited to being specified by which detection area Q they are located within; If valid information can be obtained from three or more receivers 12A regarding the same beacon signal transmitted by the receiver, the receiver 12A may be accurately identified from that information.

In addition, various short-range wireless communication technologies such as RFID (Radio Frequency Identifier) technology can be used in order to detect the location of the transmission source, in addition to beacon technology.

[2-3] Third modified example In the above-mentioned safety control system, a warning to the dangerous area Rd is issued when the worker is not within the safe area Rs (specifically, if the worker is not in the dangerous area Rd on a heavy machine). A judgment was made that the worker was not in a safe place (specifically, that the worker disembarked from the heavy equipment within the danger area Rd). However, the warning to the dangerous area Rd may be executed only when either one of the judgments is made.

[2-4] Fourth modification In the safety control system described above, switching between autonomous control and heteronomous control in the control device 32 mounted on heavy machinery is not limited to control over the warning device 31; The present invention can also be applied to various types of control for heavy machinery that can be performed by the device 32.

In addition, the timing of the above switching is not limited to the timing when the radio wave condition of network communication deteriorates, but can be changed at various timings depending on the location of the heavy equipment or the radio wave condition of network communication, as long as it is before network communication is completely cut off. Applicable. As an example, the above switching may be performed at the timing when the heavy equipment has advanced a predetermined distance from the boundary between the dangerous area Rd and the safe area Rs toward the face 100A.

[2-5] Other variations The above-mentioned safety control system is applicable not only to tunnel excavation sites but also to dangerous areas (i.e., areas where there is a risk of contact with heavy equipment if a worker enters without permission). It can be applied to various construction sites where

In the above-mentioned safety control system, even if the transmitter 11A attached to a worker fails and cannot transmit a beacon signal, it is determined that the worker is not within the safe area Rs, and the worker is sent to the dangerous area. A warning may be given to those within Rd.

In the above-mentioned safety control system, warnings within the danger area Rd are not limited to those directed to workers riding on heavy machinery within the danger area Rd, but also to those who enter the danger area Rd without riding on the heavy machinery. It may also be aimed at workers. For example, the warning lighting device 22 includes one that emits a warning color light toward the face 100A for the former worker, and one that emits warning color light toward the face 100A for the latter worker near the boundary between the dangerous area Rd and the safe area Rs. The device may also include a device that emits a warning color light toward the device. Furthermore, the warning may be issued not only within the dangerous area Rd but also within the safe area Rs.

The above description of the embodiments should be considered to be illustrative in all respects and not restrictive. The scope of the invention is indicated by the claims rather than the embodiments described above. Furthermore, the scope of the present invention is intended to include all changes within the meaning and range of equivalence of the claims.

For example, the present invention is not limited to a system that includes all of the position detection system 1, lighting control system 2, heavy equipment control system 3, and management server 4 as components like the safety control system described above. It also includes a portion of the various devices and processing units included in these devices extracted as the minimum components of a safety control system necessary to solve various problems. Furthermore, the present invention is not limited to safety control systems, but includes inventions in which each component of the safety system is considered as an invention individually, and various devices and processing units included in those components are individually considered as inventions. It also includes things that are considered inventions.

1 Position detection system 2 Lighting control system 3 Heavy equipment control system 4 Management server Q Detection areas 11, 11A, 11B Transmitter 12, 12A, 12B Receiver 12C Directional receiver 21 Work lighting device 22 Warning lighting device 23 Control device 31 Warning device 32 Control device 41 Detection processing unit 42 Judgment processing unit 43 Warning processing unit D1 First response data D2 Second response data Rd Danger area Rs Safe area 100A Face 100B Mine mouth 101 Protective wall 101A Holding frame 102A, 102B, 102C Communication Repeater Ip1, Ip2 identification information

Claims (7)

There are two areas with a predetermined location as the boundary, one area where multiple heavy machinery works is a dangerous area, and the other area is a safe area, and the predetermined location changes as the work progresses. A safety control system applied to construction sites,
a worker detection unit that detects the position of each worker working at the construction site;
a determination processing unit that determines, for each worker, whether the worker is within the safe area or in a safe place within the dangerous area, based on the detection result of the worker detection unit; and,
a warning processing unit that issues a warning to the dangerous area when the judgment processing unit determines that at least one of the workers is not in the safe area or in the safe place;
Safety control system. This is a safety control system that is applied to construction sites where excavation is carried out in tunnels , and the area from the cutting edge to the position retreating a predetermined distance from the tunnel entrance is defined as a dangerous area, and the area from the retreated position to the tunnel entrance side is defined as a safe area. There it is,
a worker detection unit that detects the position of each worker working at the construction site;
a determination processing unit that determines, for each worker, whether the worker is within the safe area or in a safe place within the dangerous area, based on the detection result of the worker detection unit; and,
a warning processing unit that issues a warning to the dangerous area when the judgment processing unit determines that at least one of the workers is not in the safe area or in the safe place;
Safety control system. The determination processing unit determines, for each worker working at the construction site, whether the worker has entered the dangerous area from the safe area based on the detection result of the worker detection unit, and determines whether or not the worker has entered the dangerous area from the safe area. 3. The safety control system according to claim 1 , wherein when it is determined that the person is not within the safe area, it is determined based on that determination that the person is not within the safety area. The determination processing unit determines, for each worker working at the construction site, whether or not the worker is riding on heavy machinery used at the construction site, based on the detection result of the worker detection unit. further judge,
The warning processing unit issues the warning to enter the dangerous area when the judgment processing unit determines that at least one of the workers has entered the dangerous area without riding the heavy equipment. , the safety control system according to claim 3 . The determination processing unit determines, for each worker working at the construction site, whether or not the worker is riding on heavy machinery used at the construction site, based on the detection result of the worker detection unit. According to claim 1 or 2, when the worker is determined to be not in the vehicle when the worker is in the dangerous area, it is determined that the worker is not in the safe place. safety control system. The determination processing unit further determines, for each worker working at the construction site, whether the worker has entered the dangerous area from the safe area, based on the detection result of the worker detection unit;
The warning processing unit issues the warning to the dangerous area when the judgment processing unit determines that at least one of the workers has entered the dangerous area by riding on the heavy equipment. 5. After that, when the determination processing unit determines that the worker is not riding on the heavy equipment even though the worker is inside the dangerous area, the warning to enter the dangerous area is issued . Safety control system as described in . A safety control system applicable to construction sites where safe areas and dangerous areas exist,
a worker detection unit that detects the position of each worker working at the construction site;
a heavy equipment detection unit that detects the position of each heavy equipment used at the construction site;
A judgment processing unit;
a warning processing section;
Equipped with
The determination processing unit determines , for each of the heavy machinery, whether or not the heavy machinery exists in the dangerous area based on the detection result of the heavy machinery detection unit, and also determines, for each of the workers, whether or not the heavy machinery exists in the dangerous area. Based on the detection result of the detection unit, determining whether the worker is in the safe area or in a safe place in the dangerous area,
The warning processing section determines that at least one of the heavy machinery is present in the dangerous area, and the warning processing section determines that at least one of the heavy machinery is present in the safe area. A safety control system that issues a warning to the danger area when the judgment processing unit further determines that the person is not inside the dangerous area or is not in the safe place.

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