KR20160092606A - System for securing closed space safety - Google Patents

Abstract

Embodiments of the present invention provide a smart wristwatch that senses biometric information of a manhole worker working in a manhole and wirelessly transmits the information at preset transmission periods; A manhole operator information, a manhole identification code, and a biometric information received from the smartwatch, to a central management server; And manhole operator information, manhole identification code, and biometric information received from the relay, and when the biometric information is not received until a predetermined time limit, And a central management server transmitting the request message.
According to the embodiment of the present invention, the biometric information of the worker working in the closed space can be monitored in real time, and the operator at risk can be quickly rescued. In addition, according to the embodiment of the present invention, it is possible to efficiently inform the outside of the work in the closed space by using the personal wearable terminal such as the smart watch.

Description

[0002] System for securing closed space safety [

The present invention relates to a system for ensuring the safety of a closed space, and a system for securing a closed space for preventing an accident by ensuring the safety of an operator working in the closed space.

Because of the insufficient ventilation in the natural state, there is always a risk of suffocation due to oxygen deficiency and suffocating harmful gas due to decay of organic matter.

Choking disasters occur during summer (June to August). Because the temperature is high and the humidity is high, microbes can easily reproduce in a short time, and the oxygen concentration is rapidly lowered or a lot of noxious gas is emitted. In particular, suffocation accidents caused by harmful gases such as wastewater treatment facilities, food collection facilities, and cable manholes are increasing every year.

If the oxygen concentration drops below 18% at 21% in the atmospheric state, abnormal symptoms such as dyspnea and headache will begin to appear. If the oxygen concentration falls below 10%, the risk of death will follow. In particular, oxidizing, storing, or oxidizing the carrier material, such as storage tanks, and rancidity of dry oil quickly reduce the oxygen in the air, so workers who perform cleaning work inside of them cause oxygen deficiency. Poisoning by toxic gases such as carbon monoxide is also very lethal. In the case of combustible gas, when methane (CH4) reaches 5%, it exceeds the minimum explosion limit, which causes a large-scale explosion. In addition, 1 kg of living organisms (excluding water) consumes oxygen in an hour at a temperature of 30 degrees Celsius from several times to a maximum of 6,000 times. At this time, harmful gases such as carbon dioxide, methane, and hydrogen sulfide are also generated. In a workplace where these microorganisms exist, workers are likely to suffer oxygen deficiency or toxic gas poisoning. In addition, when dissolved oxygen is low in various tanks, enclosed rooms (inside refrigerators, freezers, etc.), and groundwater, oxygen is dissolved in the air to cause oxygen deficiency. In addition, suffocation by disposal of replacement gas occurs. There is a risk of suffocation by nitrogen substitution and nitrogen ingestion in order to prevent fire explosion in reaction tower and piping of chemical process. In addition, there is a danger in various storage tanks, arc welding using inert gas in a place with bad ventilation, cutting work, freezer using liquid or dry ice.

Therefore, in order to prevent disasters caused by various gases, the allowable concentration for each type of gas is stipulated in the Industrial Safety and Health Law and strictly controlled.

However, in the field, the lack of oxygen or the exposure of harmful gas is an invisible risk, so managers and workers are often alerted. In addition, safety and health education before work is not provided without safety equipments required for confined space work, and it is urgent to prepare for a serious summer.

When work is performed in a closed space such as a hopper, a manhole, a duct, or a tank of a harmful gas generated in a steelworks and various industrial sites, particularly in an underground passage, the degree of oxygen deficiency, the generation of harmful gas and explosive gas is detected in advance, Safety devices that protect life and property are essential.

However, it is difficult for a worker working in the workplace to recognize gas leakage in the workplace without a separate equipment. When the operator perceives a gas leak, the worker must evacuate from the workplace or take a follow- It may become too late.

Moreover, it is also very important to quickly inform the outside of the risk situation when the worker is trapped in the workplace and need external help. Conventionally, various types of gas leakage detection systems have been disclosed as solutions to such problems, but they are required to be installed only in a workplace, so that they are low in portability and expensive.

Furthermore, there is a need for a separate safety device capable of preventing the occurrence of safety accidents caused by problems such as suffocation of toxic gas or poisoning due to difficulty in inhaling oxygen during worker escape from the work space.

Korean Patent Publication No. 10-2011-0070312

The technical problem of the present invention is to secure the safety of an operator working in a confined space to prevent accidents. The technical problem of the present invention is to quickly rescue workers at risk in work in an enclosed space.

Embodiments of the present invention provide a smart wristwatch that senses biometric information of a manhole worker working in a manhole and wirelessly transmits the information at preset transmission periods; A manhole operator information, a manhole identification code, and a biometric information received from the smartwatch, to a central management server; And manhole operator information, manhole identification code, and biometric information received from the relay, and when the biometric information is not received until a predetermined time limit, And a central management server transmitting the request message.

Wherein the central management server comprises: a manhole location database storing manhole location information allocated to the manhole identification code; A contact database storing contacts of the manager and contacts of workers; A display unit for displaying manhole position information allocated to a manhole identification code received from the relay apparatus and biometric information received from the relay apparatus; A server control unit for transmitting a structure request message including manhole operator information and manhole location information to the manager's terminal, when the biometric information is not received until a predetermined time limit, to the contact of the manager; And a worker position database for receiving and storing in real time the positional information of each worker through the worker terminal and storing the updated information in real time and the server control unit transmits biometric information when the biometric information is not received until a preset time limit A rescue request message including manhole worker information and manhole location information can be transmitted to an employee closest to the manhole where the repeater is located.

The smartwatch may include a current sensing sensor for sensing a current, and may transmit an electric shock occurrence occurrence message to the central management server when the sensed current is greater than a predetermined threshold current value.

The closed space safety securing system includes a smart glass that is worn by the manhole operator and wirelessly transmits a manhole inner image to the relay in real time, and the relay transmits the received manhole inner image to the central management server And the central management server can display the received manhole internal image.

The closed space safety securing system may include a transponder stand installed on an inner wall of an upper end of the manhole, the transponder may be mounted thereon, and a mounting sensor for sensing the mounting of the transponder may be installed. A warning light which is positioned on the bottom surface of the manhole and is flickered when the attachment of the relay is detected; A speaker disposed on a bottom surface of the manhole and outputting a safety cooperative voice when the receiver of the repeater is detected; And a display panel located on a bottom surface of the perimeter of the manhole and displaying a safety cooperation phrase when an attachment of the relay device is sensed.

The repeater may include an environmental measurement sensor for measuring environmental information including manhole temperature, manhole humidity, and manhole oxygen concentration, and may transmit the measured environment information to the central management server.

The manhole includes an oxygen supply pipe provided on the inner wall of the manhole bottom; And a gas discharge pipe provided at an upper end outer wall of the manhole and connected to an external discharge pump, wherein when the living body information is not received until a predetermined time limit and the environment information is out of a preset reference range, It is possible to supply oxygen through the supply pipe and discharge the gas inside the manhole through the gas discharge pipe.

According to the embodiment of the present invention, the biometric information of the worker working in the closed space can be monitored in real time, and the operator at risk can be quickly rescued. In addition, according to the embodiment of the present invention, it is possible to efficiently inform the outside of the work in the closed space by using the personal wearable terminal such as the smart watch.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a system for securing a closed space according to an embodiment of the present invention; FIG.
2 is a block diagram of a configuration of a central management server according to an embodiment of the present invention;
3 is a block diagram of a system for securing a closed space having a smart glass according to an embodiment of the present invention.
4 is a cross-sectional view schematically illustrating a cross section of a manhole according to an embodiment of the present invention.
5 is a view showing a warning lamp, a speaker, and a display panel provided around a manhole cover according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating a state in which a safety cooperation statement is displayed on a smartphone according to an embodiment of the present invention; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order to explain the present invention in detail so that those skilled in the art can easily carry out the present invention. . Other objects, features, and operational advantages of the present invention, including its effects and advantages, will become more apparent from the description of the preferred embodiments. It should be noted that the same reference numerals are used to denote the same or similar components in the drawings.

FIG. 1 is a configuration diagram of a closed space security securing system according to an embodiment of the present invention, and FIG. 2 is a block diagram of a configuration of a central management server according to an embodiment of the present invention.

It is also very important to inform the outside of the danger situation promptly when the operator is in an enclosed work area such as a manhole 10 and need external help. Furthermore, there is a need for a safety device that can prevent the occurrence of safety accidents due to problems such as suffocating or poisoning of noxious gas due to difficulty in inhaling oxygen during worker escape from the work space.

The present invention may include a smart watch 300, a repeater 200, and a central management server 100 to safely rescue a worker trapped in a closed space (hereinafter referred to as a 'manhole operator'). In addition, it may include a relay holder 12, a warning light B, a speaker A, and a display panel (not shown).

The smart watch 300 is a wearable device, and can be connected to a smart phone 200, which is a relay device, through a Bluetooth, so that characters or incoming calls can be checked on a clock screen. In addition, an application (hereinafter referred to as "health care application") is installed in the smart watch 300 so that it can check the contents of a karaoke phone, make phone calls, and take a picture. In particular, the smart wristwatch 300 of the present invention can measure health information such as body temperature, heart rate (heart rate), pulse rate, number of breaths, blood pressure, and oxygen saturation by installing a health care application. Therefore, the biometric information such as body temperature, heart rate (heart rate), pulse rate, number of breaths, blood pressure, and oxygen saturation measured in the smart wrist 300 worn on the wrist of a manhole worker is periodically transmitted to the repeater 200, Lt; / RTI >

The smartwatch 300 transmits the measured biometric information to the repeater 200 via Bluetooth, which is a short distance wireless communication method. Bluetooth (bluetooth) refers to short-range wireless communication technology that transmits information such as pictures and voice between portable devices such as smartphones, earphones, and notebooks.

The smartwatch 300 also includes a current sensing sensor (not shown) that senses a current. When the sensed current is greater than a predetermined threshold current value, the smartwatch 300 may transmit an electric shock incident occurrence message to the central management server 100 have. A manhole worker trapped in a confined space may lose consciousness due to an electric shock. A large electric shock current flows to a manhole operator in the event of an electric shock, so that the smart wrist 300 on the wrist of a manhole operator senses an electric shock current greater than a preset threshold current value and an electric shock accident message indicating an electric shock accident And transmits it to the central management server 100. Therefore, the manager of the central management server 100 knows that an electric shock accident has occurred at the work site of the manhole operator, and by blocking the current flowing through the manhole, the rescuer enters the manhole and prevents the second electric shock accident .

Also, when the electric shock accident occurrence message is not received, it is judged that the electric current causing the electric shock does not flow in the manhole, and the rescuer can safely enter the manhole and rescue the manhole operator quickly.

The relay 200 transmits manhole operator information, manhole identification code, and biometric information received from the smartwatch 300 to the central management server 100.

The repeater 200 is a terminal capable of wireless communication with the central management server 100 like a smart phone. The repeater 200 may be implemented as a smart phone or the like. A smartphone can be a personal smartphone owned by a manhole operator. Here, a smart phone is an intelligent terminal that adds a computer support function such as internet communication and information search to a mobile phone, so that a desired application can be installed. The smart phone combines the advantages of a mobile phone and a personal digital assistant (PDA), integrating data communication functions such as schedule management, fax transmission and reception, and Internet access to mobile phone functions. In addition to being able to connect directly to the Internet using wireless Internet, it can be accessed in various ways using various browsing programs. In addition, unlike existing mobile phones, you can install, add or delete hundreds of various applications (applications) as you want, and you can create your own applications, Can be implemented. Such a relay 200 is in short-range wireless communication with the smartwatch 300, and there is no limitation on the type of the relay server 200 when performing 3G / 4G mobile communication or wired LAN communication with the central management server 100. [ Accordingly, various relay terminals may be used as the relay device 200 in addition to the smart phone.

For example, when the repeater 200 is implemented as a smart phone, the repeater 200 performs data communication using a wireless mobile communication network including a base transceiver station (BTS) and a mobile switching center (MSC) can do. For reference, a mobile radio communication network includes a base station (BS), a mobile telephone switching office (MTSO), a home location register (HLR) (Access Gateway), a Packet Data Serving Node (PDSN), and the like, which enable the mobile terminal to access the mobile terminal.

Also, when the repeater 200 is implemented as a wired LAN terminal rather than a smart phone, a wired LAN terminal that has been supplied in a situation room when the manhole worker participates in a manhole work may be considered. The wired terminal can perform data communication using a network communication network. That is, data communication can be performed according to an Internet protocol such as TCP / IP (Transmission Control Protocol / Internet Protocol). The wired LAN port provided on the sidewall of the manhole 10 and the wired LAN terminal can be connected to perform data communication with the relay server 200, which is a wired LAN terminal, and the central management server 100.

In the following description, it is assumed that the repeater 200 is implemented as a smart phone. In the description of the embodiment of the present invention, the manhole 10 will be described as an example of the closed space. However, the manhole 10 as well as the manhole cover 11 may cover both the outside and the closed space when the cover is closed .

The repeater 200 stores manhole operator information. The relay device 200, which is a smartphone, can be equipped with a safety helper application. An application installed in a smart phone (hereinafter referred to as a 'safety helper application') inputs information of a manhole operator in advance and stores the information in a memory. The manhole operator information may include the number, name, contact, and photograph of a worker (hereinafter referred to as a 'manhole operator') working inside a confined space such as the manhole 10. The manhole worker information includes manhole work content, for example, "welding, painting, gas, cutting work near the underground 10 m".

Also, the repeater 200 transmits the manhole identification code, which the manhole operator is working on, to the relay 200. The manhole identification code is a unique identification code that allows the central management server 100 to identify the position of the manhole 10. The manhole identification code is managed by the central management server 100 and corresponding manhole location information is assigned to the central management server 100 for each manhole identification code and stored.

The manhole identification code is numerically displayed on the surface of the manhole cover 11 so that the operator can read the manhole identification code and input directly to the relay 200. [ Or the manhole identification code may be displayed on the surface of the manhole cover 11 in the form of a bar code or a QR code so that the manhole identification code can be automatically input by reading the camera on the relay 200 of the smartphone.

The central management server 100 displays the manhole identification code and biometric information received from the relay 200. By displaying the manhole identification code and the biometric information received from the repeater 200, the manager can monitor the position of the manhole operator located in each manhole 10 in real time. In addition, biometric information of the manhole worker can be monitored in real time and the danger can be immediately detected.

In addition, when the biometric information is not received until the predetermined time limit, the central management server 100 transmits a structure request message including manhole operator information and manhole location information to the terminal of the administrator. For example, if biometric information is not received even after 6 minutes, which is the set time limit, biometric information is set to be received every five minutes. In this case, And transmits the message to the manager's terminal. The manager terminal may correspond to various wireless terminals such as a manager's smartphone, a TRS terminal, and the like.

The central management server 100 may include a manhole location database 120, a contact database 130, a display unit 150, and a server control unit 110 as shown in FIG. In addition, it may include a worker location database 140.

The manhole location database 120 is a database (DB) storing manhole location information for each manhole identification code. (E.g., GPS location information, location information based on a building reference in a factory, location information based on a road name reference, etc.) are stored for each manhole identification code.

The contact database 130 is a database in which manager's contacts and employee's contacts are allocated and stored. The contact information of the manager who manages the central management server 100 is stored, and the contacts of the workers are stored. The contact may be a telephone number of a mobile communication terminal such as a smart phone.

The worker location database 140 receives the location information of each worker through the worker terminal and updates it in real time. Each worker has his own smartphone. When the safety helper application is installed on the smartphone of the worker, the safety helper application periodically detects the position of the smartphone of the worker and transmits it to the central management server 100. The central management server 100 updates and stores the position of the worker received in real time in the worker location database 140. [

For reference, the manhole location database 120, the contact database 130, and the worker location database 140 may include a hard disk drive, an SSD drive, a flash memory, a CF card Which can input and output information such as a Compact Flash Card, an SD card (Secure Digital Card), an SM card (Smart Media Card), an MMC card (Multi-Media Card), or a Memory Stick Or may be provided in a separate apparatus.

The display unit 150 displays the manhole location information allocated to the manhole identification code received from the relay 200 and the biometric information received from the relay 200. Therefore, the manager of the central management server 100 can monitor the position and biometric information of the manhole operator through the display unit 150 in real time. The manager who monitors the location information in real time first approaches / accesses the location information with the goods (oxygen respirator / firecracker / rope strap / flashlight) necessary / necessary for the structure. If the biometric information such as a pulse is getting worse, the manhole operator can be checked for safety by calling the operator. If the safety is not confirmed by telephone, the user can go to the manhole (10) for rescue.

When the biometric information is not received until a predetermined time limit, the server control unit 110 transmits a structure request message including manhole operator information and manhole location information to the manager's terminal to the manager's contact. For example, if biometric information is not received even after 6 minutes, which is the set time limit, biometric information is set to be received every five minutes. In this case, The message can be transmitted to the administrator's smartphone in the form of SNS or MMS character. Therefore, even if the manager leaves the display unit 150 and leaves the seat, the user can receive an emergency in real time.

When the biometric information is not received up to the predetermined time limit, the server control unit 110 transmits the manhole worker information and the manhole position information to the workers closest to the position of the manhole 10 where the relay 200 transmitting the biometric information is located A rescue request message may be transmitted. For example, when the repeater 200 for transmitting biometric information is the repeater 200 installed in the manhole 10 of the 1-2 block 3, A structure request message including manhole worker information and manhole location information can be transmitted as a contact. Therefore, when the status room operating the central management server 100 is located far away from the location where the repeater 200 for transmitting biometric information is located, the other workers closest to the repeater 200 are allowed to perform rescue activities, .

On the other hand, in the case of a high-risk worker who wears a mask to a manhole 10 having a very high carbon dioxide concentration, the work situation is monitored in real-time in a situation room, and immediate measures are required in case of an operator's risk. Therefore, it is necessary to understand in real time whether a high-risk worker is falling down without consciousness while he is working or moving.

To this end, as shown in FIG. 3, the closed space safety securing system of the present invention includes a smart glass 400 that is worn by a manhole operator and wirelessly transmits a manhole inner image to the relay 200 in real time . The repeater 200 transmits the received manhole internal image to the central management server 100 and displays the received manhole internal image of the central management server 100 through the display unit 150.

On the other hand, when working inside a closed space such as the manhole 10, since the outside situation does not know the operation situation, an external third party can close the manhole cover 11, which may result in isolation of the manhole operator. Therefore, in order to prevent such an unexpected situation, the present invention has warning means around the manhole 10. 3 and 4 in detail.

FIG. 4 is a cross-sectional view schematically illustrating a sectional view of a manhole according to an embodiment of the present invention, FIG. 5 is a view illustrating a warning lamp, a speaker, and a display panel provided around a manhole cover according to an embodiment of the present invention, FIG. 6 is a diagram illustrating a state where a safety cooperation statement is displayed on a smartphone according to an embodiment of the present invention.

The closed space safety securing system of the present invention may include a relay holder 12, a warning light B, a speaker A, and a display panel (not shown).

The transponder table 12 is provided on an inner wall of an upper end of the manhole 10 and is provided with a stationary sensor (not shown) for detecting the stationary station 200 as a stationary station.

The repeater base 12 may be embodied in a form of a stationary frame with an open top, so that the repeater 200 can be mounted and detached from the upper side. The relay holder 12 is located on the inner wall of the manhole 10, and is located on the inner wall of the uppermost end of the manhole 10.

The relay 200 can be mounted on the relay holder 12 before the manhole operator descends down the ladder. If the repeater 200 is a smartphone, the manhole operator can mount the smartphone on the repeater holder 12 before descending down the ladder.

In the case where the repeater 200 is a terminal connected by a wired LAN rather than a smart phone, the repeater 200 is connected to the wired LAN connection port around the repeater holder 12, And can mount the repeater base 12.

A stationary sensor (not shown) can be directly sensed by the sensor, so that if the sensor bar is depressed by the sensor bar, the sensor can detect the stationary station 200. In addition, it is realized as an optical sensor including a light emitting sensor and a light receiving sensor which are opposed to each other, and when the light emitting diode is not received by the relay 200 between the light emitting sensor and the light receiving sensor, it is detected that the relay 200 is mounted can do. The mounting detection sensor (not shown) can be implemented by various mounting detection means.

The warning light B is located on the bottom surface of the manhole 10 and blinks when the mounting of the relay 200 is detected. When the station 200 is detected, the manhole cover 11 is opened because the manhole operator is inside the manhole. Therefore, the warning lamp B is blinked to inform the surrounding people.

And outputs a safety cooperative voice when the relay 200 is placed on the bottom surface of the manhole 10. When the station 200 is detected to be stationary, it means that the manhole worker is inside the manhole, so that the manhole cover 11 is opened. For example, 'Ventilation is being carried out and I am working, absolutely !! Do not close the manhole cover 11 '.

Since the display panel (not shown) is located on the bottom surface of the manhole 10 and the attachment of the relay 200 is detected, the ventilation is being performed to perform the operation. Do not close the manhole cover 11 '. Although the display panel (not shown) may be implemented as a separate screen panel located on the bottom surface of the manhole 10, if the repeater 200 is implemented as a smartphone, Safety cooperation text may be displayed as shown.

On the other hand, the lack of oxygen in a closed space like the manhole 10 can have a fatal impact on the manhole operator. Therefore, it is possible to measure the environmental information inside the manhole and to control the exhaust pipe installed in the manhole 10 according to the measured value of the environment information.

To this end, the repeater 200 includes an environment measurement sensor for measuring environmental information including manhole temperature, manhole humidity, and manhole oxygen concentration, and transmits the measured environment information to the central management server 100. When the repeater 200 is implemented as a smart phone, a smartphone may be provided with a temperature measurement sensor, a humidity measurement sensor, and an oxygen measurement sensor to measure manhole temperature, manhole humidity, and manhole oxygen concentration. When the repeater 200 is implemented as a separate wired terminal other than a smart phone, a temperature measurement sensor, a humidity measurement sensor, and an oxygen measurement sensor are provided in the wired terminal.

The manhole 10 is provided with an oxygen supply pipe 14 provided on the inner wall of the manhole lower end and a gas discharge pipe 13 provided on the outer wall of the manhole upper end and connected to an external discharge pump. The oxygen supply pipe 14 and the gas discharge pipe 13 are provided at opposite diagonal positions facing each other.

 The server control unit 110 supplies oxygen through the oxygen supply pipe 14 to the gas discharge pipe (not shown) when the biometric information is not received until the preset time limit and the environment information, i.e., the oxygen concentration, 13) to discharge the gas inside the manhole. Therefore, the oxygen supplied from the oxygen supply pipe 14 pushes the gases inside the manhole into the gas discharge pipe 13 to fill the inside of the manhole with oxygen so that the inside of the manhole is filled with oxygen even before the rescue person reaches the manhole 10 It is possible to prevent the condition of the manhole operator from being further deteriorated.

The embodiments of the present invention described above are selected and presented in order to assist those of ordinary skill in the art from among various possible examples. The technical idea of the present invention is not necessarily limited to or limited to these embodiments And various changes, modifications, and equivalents may be made without departing from the spirit and scope of the present invention.

10: Manhole 11: Manhole cover
100: central management server 200: repeater
300: Smart Watch 400: Smart Glass
110: server control unit 120: manhole location database
130: Contact database 140: Worker location database
150:

Claims (7)

A smartwatch for sensing biometric information of a manhole worker working in a manhole and wirelessly transmitting the information on a preset transmission cycle;
A manhole operator information, a manhole identification code, and a biometric information received from the smartwatch, to a central management server; And
Manhole worker information, manhole identification code, and biometric information received from the repeater, and when biometric information is not received until a preset time limit, A central management server transmitting the message;
The system comprising:
The system according to claim 1,
A manhole location database in which manhole location information is allocated and stored for each manhole identification code;
A contact database storing contacts of the manager and contacts of workers;
A display unit for displaying manhole position information allocated to a manhole identification code received from the relay apparatus and biometric information received from the relay apparatus;
A server control unit for transmitting a structure request message including manhole operator information and manhole location information to the manager's terminal, when the biometric information is not received until a predetermined time limit, to the contact of the manager; And
And a worker location database for receiving, via a worker terminal, location information of each worker and updating the worker information in real time,
When the biometric information is not received up to the predetermined time limit, the server control unit transmits a structure request message including manhole worker information and manhole location information to a worker closest to the manhole where the repeater for transmitting biometric information is located Confined Space Safety System.
The smartwatch according to claim 2,
And an electric shock incident occurrence message is transmitted to the central management server when the sensed electric current is greater than a preset threshold current value.
The system of claim 1,
And a smart glass which is worn by the manhole operator and wirelessly transmits a manhole inner image to the relay in real time,
Wherein the repeater transmits the received manhole internal image to the central management server,
Wherein the central management server displays a received manhole internal image.
The system of claim 1,
A relay holder installed on an upper inner side wall of the manhole, the relay holder being mountable and provided with a mounting sensor for sensing the mounting of the relay;
A warning light which is positioned on the bottom surface of the manhole and is flickered when the attachment of the relay is detected;
A speaker disposed on a bottom surface of the manhole and outputting a safety cooperative voice when the receiver of the repeater is detected; And
A display panel located on a bottom surface of the perimeter of the manhole and displaying a safety cooperation phrase when the installation of the repeater is detected;
A closed space safety system.
3. The repeater according to claim 2,
A system for securing a closed space, comprising an environmental measurement sensor for measuring environmental information including a manhole temperature, a manhole humidity, and a manhole oxygen concentration, and transmitting the measured environment information to the central management server.
The method of claim 6,
The manhole includes an oxygen supply pipe provided on the inner wall of the manhole bottom; And a gas discharge pipe provided on the upper end wall of the manhole and connected to an external discharge pump,
Wherein the server control unit supplies oxygen through the oxygen supply pipe and discharges the gas inside the manhole through the gas discharge pipe when the biometric information is not received until a preset time limit and the environment information is out of a preset reference range A system for securing a closed space.

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