KR20100042179A

KR20100042179A - Manhole cover and manhole management system

Info

Publication number: KR20100042179A
Application number: KR1020080101348A
Authority: KR
Inventors: 김종삼
Original assignee: 김종삼
Priority date: 2008-10-15
Filing date: 2008-10-15
Publication date: 2010-04-23

Abstract

The present invention provides a manhole cover with a built-in electronic circuit that detects various conditions of the surrounding environment for the inside and outside of the manhole and generates and outputs a detection result thereof, the main body forming the outline of the manhole cover covering the entrance of the manhole, and An electronic circuit unit mounted to the main body to detect the internal and external environmental conditions of the manhole and wirelessly output the detection result, and a manhole cover comprising a power supply unit mounted to the main body for supplying operating power to the electronic circuit unit To provide.

Description

MANHOLE COVER AND MANHOLE MANAGEMENT SYSTEM

The present invention relates to a manhole cover and a manhole management system, and more particularly, a manhole cover having an electronic circuit capable of monitoring environmental conditions inside and outside the manhole and communicating with the manhole cover to manage the environmental state of each manhole. It relates to a manhole management system.

Recently, as high-speed information communication is widely applied, management of communication manholes has emerged as a very important matter. In telecommunications infrastructure, the failure of a telecommunications facility in a telecommunications manhole is directly related to the interruption of service, and the damage is massive socially and economically. The importance of such a manhole applies not only to communication facilities but also to power facilities, gas facilities, water and sewage facilities, etc., which are buried underground.

However, the current manholes installed in various places are managed by covering only the iron manhole cover, and the management of the occupants or the workers is not performed at all. In addition, since manholes are arbitrarily installed and managed by local governments or management businesses, integrated management and maintenance thereof is required.

In addition, since there is no appropriate monitoring system for various environmental conditions inside the manhole, it is difficult to respond early to various accidents that may occur inside the manhole.

In order to solve this problem, Korean Patent Laid-Open Publication No. 2003-54212 (name of the invention: a remote monitoring system of an underground cavity) (hereinafter, referred to as a conventional invention) is disclosed.

10 is a diagram illustrating a remote monitoring system for detecting a manhole environment according to the related art. This conventional invention, a plurality of sensors 51 for sensing an environmental condition, a remote terminal device 55 for aggregating a detection signal sensed by the sensor 51, and Bluetooth that can communicate with the remote terminal device 55 A remote monitoring system with a module 53 is shown. This system is further shown with the manhole cover 4 incorporating antennas 34 and 56.

However, in such a system, a separate remote terminal device 55 must be installed inside the manhole 2, and the wireless terminal device uses antennas 34 and 56 embedded in the manhole cover 4 for wireless communication. Separate coupling for communication with the 55 and the manhole cover 4 is required. In addition, there is a problem that such a system cannot be applied to a small underground space where an operator cannot directly enter and even a remote terminal device 55 has no space for installation.

On the other hand, it is also necessary to manage the economic loss caused by theft of the iron manhole cover that occurs recently and the safety accident caused by the open manhole.

The present invention is to solve the above-mentioned problems, to provide a manhole cover with a built-in electronic circuit for sensing the various conditions of the surrounding environment for the inside and outside of the manhole, and generates and outputs a detection result therefor.

In addition, by receiving and managing the information detected from the manhole cover in real time, to provide a manhole management system that can quickly detect and respond to various accidents occurring in the manhole early in the generation.

The present invention to solve the above problems, the main body forming the appearance of the manhole cover covering the entrance of the manhole, and an electronic circuit unit mounted to the main body to sense the internal and external environmental conditions of the manhole, and wirelessly output the detection result And a power supply unit mounted to the main body to supply operating power to the electronic circuit unit.

In addition, in order to block at least a part of the electronic circuit unit mounted on the main body from the internal and external environment of the manhole, characterized in that it further comprises a hermetic cover for sealing a part of the main body.

In addition, the electronic circuit unit has a plurality of sensors, a sensor unit for outputting a detection result of the sensor for various environmental conditions inside and outside the manhole, and a wireless communication unit and the power supply unit for wirelessly transmitting the detection result. A power input unit for receiving the operating power from the power input unit and a microcomputer for controlling the input of the operating power from the power input unit to each unit and outputting the sensing result from the sensor unit through the wireless communication unit. do.

The sensor unit may include at least one of a camera, a human body sensor, an open sensor, a fire sensor, a flood sensor, a gas sensor, and a temperature and humidity sensor.

The electronic circuit unit is further characterized by receiving wireless information transmitted from a wireless communication unit of another manhole cover.

In addition, the power supply unit outputs power from the solar cell as the operating power when the solar cell and the battery and the solar cell are capable of outputting predetermined power, and the solar cell does not output the predetermined power. If not, it characterized in that it comprises a power selection unit for outputting the power by the battery as the operating power.

In addition, the main body is characterized in that it further comprises a plurality of opening and closing unit for fixing the manhole cover so as not to open to the manhole.

The opening / closing unit may include a locking bolt that moves forward and backward toward a locking groove provided at the entrance of the manhole, and a locking bolt driving unit that moves the locking bolt forward or backward according to the opening / closing signal output from the micom. It is done.

In addition, the opening and closing unit, the locking bolt for moving forward and backward toward the locking groove provided in the entrance of the manhole, and the locking bolt drive unit for advancing or retracting the locking bolt by the action of the key box to which the manager key is applied. It is characterized by including.

In addition, the body is characterized in that made of reinforced plastics.

In addition, the main body is further provided with a dustproof material for alleviating the pressure and impact applied from the outside of the main body, in a portion in contact with the inlet of the manhole.

In addition, the present invention is the central server for receiving the manhole cover as described above, and the detection result output from the manhole cover and manages information on the environmental state inside and outside the manhole in which the manhole cover is disposed based on the detection result It provides a manhole management system comprising a.

Further, the first manhole cover wirelessly transmits the detection result to the adjacent second manhole cover, and the second manhole cover wirelessly transmits the received detection result back to another adjacent third manhole cover. By performing the manhole cover, the detection result by any one of the manhole cover is finally transmitted to the central server.

According to the present invention, the electronic circuit is embedded inside the manhole cover, so that various states of the surrounding environment with respect to the inside and outside of the manhole can be sensed, and a detection result thereof can be generated and output. In addition, by receiving and managing the information detected from the manhole cover in real time, it is possible to quickly detect and respond to various accidents occurring in the manhole at the early stage of occurrence.

Moreover, with this manhole cover and manhole management system, all the structure of a manhole management system is completed only by covering a manhole cover to the entrance of a manhole. That is, separate detection sensors and remote terminal devices do not need to be installed inside the manhole, and a separate connection for supplying power to electronic components is unnecessary, and real-time information is obtained by wireless communication even for a manhole cover disposed at a long distance. This becomes possible. In addition, the manhole management system can be controlled even for a manhole having insufficient space for installing a remote terminal device.

Hereinafter, the detailed configuration of the manhole cover and manhole management system according to the present invention will be described with reference to the drawings.

Manholes are holes and underground spaces provided for access from the ground to underground communication lines, electric power lines, gas pipelines, water and sewage lines, and the like.

The manhole cover covers the entrance of the manhole to prevent foreign matters from entering the manhole from inside and into the unauthorized man, and prevents accidents due to falls by blocking holes provided in the road for manhole entrance. do. Such a manhole cover is generally made of a heavy metal material. In addition, the manhole inlet and the manhole cover are generally circular, in order to prevent the manhole cover from falling into the inside of the manhole.

1 is a view showing a schematic configuration of a manhole cover according to an embodiment of the present invention. According to FIG. 1, the manhole cover 100 includes a main body 101, an electronic circuit unit 110, a power supply unit 120, and an airtight cover 102.

The main body 101 forms the external shape of the manhole cover 100. Manhole cover 100 is mainly in the form of a circular plate. Hereinafter, the ground side of the manhole cover 100 is referred to as the upper surface, and the basement side is referred to as the lower surface.

The electronic circuit unit 110 is provided on the lower surface of the main body 101 and includes a sensor (see FIG. 2) for sensing various environmental conditions on the inside and / or outside of the manhole, and the detection result by the sensor Is output via wired or wireless. The present invention uses wireless communication.

The power supply unit 120 supplies operating power to various components including the electronic circuit unit 110. The power supply unit 120 may be a general rechargeable or non-rechargeable battery 124 (see FIG. 3), may be DC or AC power input from the outside, or may be a solar cell 122 (see FIG. 3). . As will be described later, in the present invention, the rechargeable battery 124 and the solar cell 122 are shared.

The airtight cover 102 is integrally coupled with the main body 101 of the manhole cover 100 to block various units built in the main body 101 with respect to the environment inside and outside the manhole. That is, a part of the sensor or the solar cell 122 is exposed to the outside, and the remaining units and components are hermetically blocked against moisture, air, vibration, pressure, temperature, and the like. This hermetic cover can ensure a safe operation of the units mounted on the main body 101 of the manhole cover 100.

Next, an electronic circuit unit in a manhole cover according to an embodiment of the present invention will be described with reference to FIG. 2. Referring to FIG. 2, the electronic circuit unit 110 includes a sensor unit 112, a power input unit 116, a wireless communication unit 114, and a microcomputer 118.

The sensor unit 112 is disposed at each part of the manhole cover main body 101 to detect various environmental conditions on the upper surface or the lower surface of the manhole cover main body 101 (or inside or outside the manhole), thereby providing a predetermined signal. It includes a plurality of sensors for outputting. In addition, the sensing result is generated using the signals output from the plurality of sensors and output to the microcomputer 118 which will be described later.

Such a sensor includes a camera 112a or an acoustic microphone for capturing an image inside a manhole, a human body sensor 112b for detecting entry of a person or a beast into the manhole, or an opening or theft of a manhole cover. The opening detection sensor 112c for detecting the opening, the fire detection sensor 112d for detecting the occurrence of a fire, the flooding detection sensor 112e for detecting the inundation due to the inflow of water and sewage into the manhole, the leakage of gas and Gas detection sensor 112f for detecting the occurrence, temperature sensor 112g for detecting the temperature change inside the manhole, and the like.

These sensors are properly disposed on the upper or lower surface of the manhole cover body 101 to perform a sensing operation.

The power input unit 116 receives the operating power from the outside of the electronic circuit unit 110 and supplies the operating power to a microcomputer 118 described later to be output at an appropriate level of current or voltage used in each unit of the electronic circuit unit 110. To help.

The wireless communication unit 114 includes a communication module 114a and an antenna 114b for performing demodulation and demodulation for transmitting the detection result from the sensor unit 112 to the outside using wireless communication. The manhole cover 100 according to the present invention preferably uses a wireless communication method such as Bluetooth, Zigbee, CDMA.

The communication module 114a of the wireless communication unit 114 not only functions to wirelessly transmit the detection result by the sensor unit 112 but also information transmitted by an adjacent manhole cover or the central server 200 to be described later (for example, detection). As a result, a remote control command for controlling the electronic circuit unit of the manhole cover) may be received. In addition, the received information may be relayed and transmitted to the adjacent manhole cover or the central server 200. This function will be described later with reference to FIG. 8.

The microcomputer 118 receives operating power from the power supply unit 120 through the power input unit 116 and supplies appropriate power to each component of the electronic circuit unit 110. Then, control results of receiving the sensing results from various sensors constituting the sensor unit 112 and wirelessly transmitting the sensing results through the wireless communication unit 114 are performed. In addition, the microcomputer 118 may control the operation of each part of the electronic circuit unit 110 in accordance with a remote control command received through the wireless communication unit 114 as necessary.

Next, a power supply unit in a manhole cover according to an embodiment of the present invention will be described with reference to FIG. 3. Referring to FIG. 3, the power supply unit 120 includes a solar cell 122, a battery 124, and a power selector 126.

The solar cell 122 is disposed on one side of the upper surface of the manhole cover 100 to perform self-generation using solar light.

The battery 124 is disposed inside the manhole cover main body 101.

The power selector 126 outputs at least one of the power output from the solar cell 122 and the power output from the battery 124 to the outside. That is, when solar light is strongly incident and the desired power can be output from the solar cell 122, the power supply selector 126 uses the electric power generated by the solar cell 122 as the operating power, and the electronic circuit unit 110. ) To the power input unit 116 side. When the sunlight is not strong and the power output from the solar cell 122 is lower than the desired power, the power selector 126 uses the power stored in the battery 124 as the operating power, so that the power of the electronic circuit unit 110 is reduced. Output to the power input unit 116.

According to such a power selection operation, while supplying operating power using indefinite solar energy, power is supplied by the battery 124 only at night or in rainy weather, so that the overall system operation time can be extended. do.

On the other hand, the battery 124 is preferably a rechargeable battery, and interlocks with the solar cell 122 to perform self-charging using the power output from the solar cell 122. According to this configuration, the system operable time of the manhole cover 100 can be extended indefinitely.

Next, the opening and closing unit in the manhole cover according to an embodiment of the present invention will be described with reference to FIG. 4. Opening and closing unit 130 is installed on one side of the manhole cover 100 according to the present invention to prevent any movement of the manhole cover 100, thereby preventing theft. Referring to FIG. 4, the opening and closing unit 130 includes a locking bolt 134 and a locking bolt driving unit 132.

The locking bolt 134 is advanced from the opening and closing unit 130 to be caught by the locking groove 135 (see FIG. 7) provided on the inlet side wall of the manhole, thereby making the manhole cover 100 fixed to the manhole, and the locking bolt When the 134 retreats from the opening and closing unit 130 and is pulled out of the locking groove 135, the manhole cover 100 is movable.

The lock bolt drive unit 132 applies a driving force to move the lock bolt 134 forward or backward. The lock bolt drive unit 132 may be a mechanical key box that secures a user authentication operation and driving power by inserting and turning an authenticated key and the like, and outputs an opening / closing signal according to an electronic authentication result for the authenticated electronic identification means. It may be an electronic key box for driving the motor or solenoid to advance or retract the lock bolt 134.

In addition, the open / close signal to the electronic keybox may be provided from the microcomputer 118. The technique using the electronic key box as described above will be described with reference to FIG. 5. FIG. 5 is a view illustrating an example of a configuration of an electronic circuit unit in a manhole cover to which an opening and closing unit is applied, and it may be confirmed that an opening and closing control unit is further added as compared to the electronic circuit unit illustrated in FIG. 2. Here, the same components as those in FIG. 2 are assigned the same numbers, and redundant descriptions are omitted.

The opening and closing control unit 119 receives an electronic authentication result output from the microcomputer 118 and outputs an opening and closing signal for controlling the lock bolt driving unit 132 of the opening and closing unit 130. That is, when the manager of the manhole cover 100 inputs the correct electronic identification information through the wireless communication unit 114, the microcomputer 118 provides the electronic authentication result for the information to the opening and closing control unit, and the opening and closing control unit 119. ) Outputs an open / close signal for the lock bolt driver 132.

Using this configuration, since the central server 200 to be described later may provide electronic identification information through the wireless communication unit 114, the opening or locking of the manhole cover 100 may be controlled remotely.

Next, with reference to FIG. 6, the shape of the manhole cover and various techniques that can be applied will be described. FIG. 6 (a) is a diagram illustrating a form in which the solar cell 122 is applied to the manhole cover 100. According to this figure, the solar cell 122 is arrange | positioned along the outer periphery of the manhole cover main body 101. As shown in FIG. Meanwhile, a transparent cover 123 (see FIG. 7) for protecting the solar cell 122 may be disposed on the solar cell 122.

FIG. 6 (b) is a diagram illustrating a form in which the dustproof material 104 is applied to a portion of the manhole cover 100 that contacts the manhole inlet. According to this figure, the vibration and pressure acting on the manhole cover 100 from the outside (mainly from the upper side) by installing the dustproof material 104 on the circumferential side (and / or side) of the lower surface of the manhole cover 100. The manhole cover 100 can be prevented from flowing into the interior.

FIG. 6 (c) is a view showing a form in which a mechanical key box that is a locking bolt 134 and a locking bolt driving unit 132 is applied to the manhole cover 100. According to this figure, by arranging a plurality of locking bolts 134 on the side of the manhole cover 100 and by arranging one or a plurality of key boxes on one side of the upper surface accessible from the outside of the manhole cover 100, the manhole cover Theft and the like to 100 can be suppressed.

7 is a side view showing the entire configuration of a manhole cover having various functions as described above. Referring to the drawings, the manhole cover main body 101 has a cross-section in the form of a П, the concave portion is equipped with a power supply unit 120 and the electronic circuit unit 110, the opening of the lower surface in the main body 101 The closed part is sealed by the airtight lid 102. In addition, the solar cell 122 and the transparent cover 123 for protecting the solar cell 122 are disposed on one side of the upper surface of the manhole cover 100.

In addition, the lock bolt 134 protruding outward and the lock bolt driver 132 for driving the lock bolt 134 are disposed on both side surfaces of the main body 101. And it can be confirmed that the dustproof material 104 is provided in the part of the manhole cover 100 which contact | connects the mounting surface 105 on which the manhole cover 100 is seated in the wall surface of a manhole entrance.

In addition, in the manhole cover 100 illustrated in FIG. 7, a form in which separate housings are formed for the electronic circuit unit 110 and the power supply unit 120 is shown. The housing is provided with airtight covers 102a and 102b, which are separate from the airtight lid 102, respectively. This is an enhanced protection scheme for the electronic circuit unit 110 and the power supply unit 120 having electronic components vulnerable to moisture or the like.

Next, the disassembled structure of the manhole cover shown in FIG. 7 will be described with reference to FIG. 8. Referring to FIG. 8, FIG. 8A illustrates an overall perspective view of the manhole cover 100. In FIG. 8B, the main body 101 of the manhole cover, the solar cell 122, and the transparent cover 123 are shown, and the electronic circuit unit 110 mounted on the main body 101, and the electronic The shockproof dustproof material 110a for dustproofing the circuit unit 110 and the main body 101, and the airtight cover 102a for sealing the electronic circuit unit 110 by primary are shown. Also shown is a power supply unit 120 and an airtight lid 102b for sealing the power supply unit 120. The locking bolt 134 is disposed on the side of the main body 101, and the locking groove 135 is illustrated on the wall surface of the manhole corresponding to the locking bolt 134.

In addition, the airtight cover 102 is positioned below the main body 101, and the shockproof dustproof material 104 is disposed between the airtight cover 102 and the main body 101. Since the dustproof material 104 is mainly made of a rubber material, the waterproof effect between the airtight cover 102 and the main body 101 is improved. Meanwhile, in FIG. 7, the dustproof member 104 is in direct contact with the seating portion 105 on the outside of the airtight cover 102, but according to FIG. 8B, the dustproof material 104 is inside the airtight cover 102. It can also be seen that

Next, a manhole management system to which a manhole cover according to an embodiment of the present invention as described above will be described with reference to FIG. 9. Referring to FIG. 8, the manhole management system includes a plurality of manhole cover 100 and a central server 200.

The manhole cover 100 is capable of wireless communication such as Bluetooth, Zigbee, CDMA, and is installed in various parts of a road or residential area. The manhole cover 100 detects environmental conditions inside and outside the manhole by a built-in sensor, and wirelessly outputs a detection result.

The central server 200 has jurisdiction over a predetermined area and receives various types of information (for example, a detection result) transmitted from a plurality of manhole cover 100 installed in the area. And by storing the received detection result in a predetermined storage means enables the integrated management by the operator.

Meanwhile, the central server 200 analyzes the detection result received from the manhole cover 100 and outputs a remote control command for the manhole cover 100 if necessary. The remote control command may include a command for executing a test transmission / reception function for checking the transmission / reception status of the manhole cover 100, a function initialization command for the manhole cover 100, and changing or collecting individual identification information specified in the manhole cover 100. Command for control, a control command to operate the equipment in the manhole by the manhole cover 100 and the like.

On the other hand, since the area covered by the central server 200 is extensive and there are many obstacles for wireless communication, the central server 200 may not be able to perform wireless communication directly from all the manhole covers 100. Therefore, in the manhole management system according to the present invention, each manhole cover 100 uses a method of transmitting information to a central server by communicating with adjacent manhole cover. Such a communication method is as widely known as a mesh topology.

Referring to FIG. 9, the first manhole cover 100-1 communicates with the second manhole cover 100-2. The second manhole cover 100-2 communicates with the third manhole cover 100-3 and the central server 200 simultaneously. In addition, the third manhole cover 100-3 communicates with the second manhole cover 100-2 and the central server 200. In this structure, although the second manhole cover 100-2 and the third manhole cover 100-3 can directly transmit and receive information with the central server 200, the first manhole cover 100-1 ) Cannot directly reach the central server 200, and information can be communicated via the second manhole cover 100-2 or the third manhole cover 100-3.

According to this structure, not only the remote manhole cover 100 and the central server 200 can communicate with each other, but also the manhole cover 100 cannot communicate with the central server 200 directly or in a first communication path. In this case, since the second server can communicate with the central server 200, the communication path can be diversified.

On the other hand, it is preferable that the manhole cover main body 101 and / or the airtight cover 102 which concerns on this invention of the structure as mentioned above consist of reinforced plastics. According to this configuration, the manhole cover 100 can be manufactured at a light weight, and the manhole cover 100 can be produced in various colors. Therefore, environmental pollution due to corrosion of the manhole cover, loss of aesthetics due to the manhole cover, economic loss due to theft of the manhole cover, and the occurrence of safety accidents may occur. It can be minimized.

On the other hand, according to the manhole management system according to the present invention configured as described above, the configuration of all systems is completed just by covering the manhole cover 100 according to the present invention to the entrance of the manhole. That is, as in the prior art, it is not necessary to install the separate detection sensors 51 and the remote terminal device 55 inside the manhole, and a separate connection for supplying power to electronic components is unnecessary, and a manhole disposed at a long distance. The lid 100 may also obtain real-time information by wireless communication.

In addition, the manhole management system can also be controlled with respect to the manhole which lacks the space to install the remote terminal apparatus 55 like the conventional invention.

1 is a view showing a schematic configuration of a manhole cover according to an embodiment of the present invention.

2 is a view illustrating an electronic circuit unit in a manhole cover according to an embodiment of the present invention.

3 is a view showing a power supply unit in the manhole cover according to an embodiment of the present invention.

4 is a view showing the opening and closing unit in the manhole cover according to an embodiment of the present invention.

5 is a diagram showing another example of the configuration of the electronic circuit unit.

6 is a view showing various forms of the manhole cover.

Figure 7 is a side view showing the overall configuration of the manhole cover according to the present invention.

FIG. 8 is an exploded view of the manhole cover shown in FIG. 7.

9 is a view showing a manhole management system to which the manhole cover according to an embodiment of the present invention.

10 is a view showing a remote monitoring system according to the conventional invention.

Claims

A main body forming an appearance of the manhole cover covering the inlet of the manhole;

An electronic circuit unit mounted on the main body to sense an internal and external environmental state of the manhole and wirelessly output a detection result;

And a power supply unit mounted to the main body to supply operating power to the electronic circuit unit.

The method of claim 1,

And a hermetic cover for sealing a part of the main body so as to block at least a part of the electronic circuit unit mounted to the main body from the internal and external environment of the manhole.

The method of claim 1,

The electronic circuit unit,

A sensor unit having a plurality of sensors and outputting a detection result of the sensor for various environmental conditions inside and outside the manhole;

A wireless communication unit for wirelessly transmitting the detection result;

A power input unit for receiving operation power from the power supply unit;

And a micom configured to control the operation power from the power input unit to be supplied to each unit and to output the sensing result from the sensor unit through the wireless communication unit.

The method of claim 3,

The sensor unit includes:

A manhole cover comprising at least one of a camera, a human body sensor, an opening sensor, a fire sensor, a submersion sensor, a gas sensor, and a temperature and humidity sensor.

The method of claim 3,

The electronic circuit unit,

A manhole cover, characterized in that for receiving wireless information transmitted from a wireless communication unit of another manhole cover.

The method of claim 1,

The power supply unit,

With solar cells and batteries,

A power source that outputs power by the solar cell as the operating power when the solar cell is able to output predetermined power, and outputs power by the battery as the operating power when the solar cell fails to output a predetermined power A manhole cover comprising a selection part.

The method of claim 1,

The main body further comprises a plurality of opening and closing unit for fixing the manhole cover so as not to open with respect to the manhole.

The method of claim 7, wherein

The opening and closing unit,

A locking bolt for advancing and retracting toward a locking groove installed at an entrance of the manhole;

And a lock bolt driving unit configured to move the lock bolt forward or backward according to the open / close signal output from the micom.

The method of claim 7, wherein

The opening and closing unit,

And a lock bolt drive unit for moving the lock bolt forward or backward by an action of a key box to which a manager key is applied.

The method of claim 1,

The body is a manhole cover, characterized in that made of reinforced plastic.

The method of claim 1,

The main body is a manhole cover, characterized in that further installed in the portion in contact with the inlet of the manhole, a dustproof material for mitigating pressure and impact applied from the outside of the main body.

A manhole cover according to any one of claims 1 to 11;

And a central server configured to receive the detection result output from the manhole cover and to manage information on environmental conditions inside and outside the manhole in which the manhole cover is disposed, based on the detection result.

The method of claim 12,

The first manhole cover wirelessly transmits the detection result to an adjacent second manhole cover, and the second manhole cover wirelessly transmits the received detection result back to another adjacent third manhole cover. And finally transmitting the detection result by any one of the manhole cover to the central server.