KR100868058B1 - Safety testing device of tunnel - Google Patents

Safety testing device of tunnel Download PDF

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Publication number
KR100868058B1
KR100868058B1 KR1020080002215A KR20080002215A KR100868058B1 KR 100868058 B1 KR100868058 B1 KR 100868058B1 KR 1020080002215 A KR1020080002215 A KR 1020080002215A KR 20080002215 A KR20080002215 A KR 20080002215A KR 100868058 B1 KR100868058 B1 KR 100868058B1
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South Korea
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tunnel
control unit
crack
cap
outer cap
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KR1020080002215A
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Korean (ko)
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김경진
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(재)한국건설안전기술원
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F11/00—Rescue devices or other safety devices, e.g. safety chambers or escape ways
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
    • E21F17/18—Special adaptations of signalling or alarm devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means

Abstract

A safety diagnosis apparatus is provided to let drivers know the crack state of tunnel and make drivers safe. A safety diagnosis apparatus comprises a cylindrical outer cap(210) of which an open storing groove(211) is formed at one end and a concavo-convex section(212) is formed at the other end, a cylindrical inner cap(220) which is inserted into the storing groove of the outer cap so that a concavo-convex section(222) is exposed to outside, a spring(230) supporting the outer cap and inner cap elastically, a crack detection tool(200) having input and output terminals(240,250) which are electrified, a control unit(300) sensing the separation of the output terminal and input terminal, an input unit controlling the operation of the control unit, a display device which is operation-controlled by the control unit and shows the crack state of tunnel, an output unit having the alarm sending the risk signal to a driver, which is operation-controlled with the control unit and is installed at the entrance of tunnel.

Description

터널 내벽의 균열위치 확인 감지용 안전진단장치{Safety testing device of tunnel}Safety testing device of tunnel for detecting the location of cracks inside tunnels

본 발명은 터널 내벽의 균열위치 확인 감지용 안전진단장치에 관한 것이다.The present invention relates to a safety diagnosis device for detecting the crack position of the tunnel inner wall.

일반적으로 터널은 산, 바다 밑, 강 밑을 뚫어서 만든다.In general, tunnels are made by drilling into the mountains, under the sea, and under the river.

이러한 터널은 장기간의 사용으로 인해 터널 내벽에 균열이 발생한다. 이런 균열은 초기에는 그 크기가 미세하지만, 이슬 등이 맺혀 점차 결로가 형성되면 그 크기가 점점 더 커져, 터널이 붕괴의 위험에 노출되게 된다.These tunnels have cracks in the tunnel walls due to prolonged use. These cracks are initially small in size, but if dew or condensation forms gradually, the size becomes larger and the tunnel is exposed to the risk of collapse.

하지만, 종래에는 터널 내벽의 균열을 관리자가 직접 육안으로 확인하여 그 위험 정도를 판단하였기 때문에 터널 내벽의 균열을 정확히 확인하기 어려웠으며, 지속적으로 터널 내벽의 균열을 확인할 수 없어, 균열이 발생한 터널에 대한 적절한 조치를 신속하게 할 수 없었다. 또한, 터널 통행 운전자가 터널의 안전상태를 확인할 수 없어, 돌발상황에 대처하여 안전운행을 할 수 없었다. However, in the related art, it was difficult to accurately identify the crack in the tunnel inner wall because the administrator directly visually checked the crack in the tunnel inner wall and judged the degree of danger. Could not promptly take appropriate action. In addition, the tunnel traffic driver could not confirm the safety state of the tunnel and could not drive safely in response to a sudden situation.

이에 본 발명은 상기와 같은 문제점을 해소하기 위해 발명된 것으로, 터널의 균열을 지속적으로 확인할 수 있어, 터널의 균열에 대한 적절한 조치를 신속하게 취할 수 있으며, 통행하는 운전자에게 터널의 균열 상태를 알려줘 운전자가 안전운행을 할 수 있도록 하는 터널 내벽의 균열위치 확인 감지용 안전진단장치를 제공함에 그 목적이 있다.Therefore, the present invention has been invented to solve the above problems, it is possible to continuously check the crack of the tunnel, can quickly take appropriate measures for the crack of the tunnel, and inform the driver of the tunnel crack state to pass through It is an object of the present invention to provide a safety diagnosis device for detecting a crack position on the inner wall of a tunnel that allows a driver to drive safely.

상기와 같은 과제를 해결하기 위한 본 발명은, 내면에 한쪽 선단으로 개구된 수납홈이 형성되고 다른 한쪽 선단의 외면에 요철부가 구비된 통형상의 외부캡과, 내면에 한쪽 선단으로 개구된 수납홈이 형성되고 다른 한쪽 선단의 외면에 요철부가 구비되어 요철부가 외부로 노출되도록 외부캡의 수납홈에 삽탈가능하게 삽입되는 통형상의 내부캡과, 외부캡 및 내부캡이 닫혀진 상태를 유지하도록 외부캡과 내부캡을 탄발적으로 지지하는 스프링과, 한 쌍을 이루며 외부캡 및 내부캡에 상호 착탈가능하게 설치되어 상호 통전되는 입·출력단자를 갖춘 균열감지기구와; 입력단자 및 출력단자와 연결되어, 입력단자와 출력단자의 이격을 감지하는 제어유닛과; 제어유닛의 작동을 제어하는 입력유닛과; 제어유닛에 의해 작동제어되어 터널의 균열 상태를 나타내는 디스플레이장치와, 제어유닛에 의해 작동제어되고 터널의 입구 쪽에 설치되어 터널에 심각한 균열이 발생하였을 경우 통행하는 차량의 운전자에게 위험신호를 보내는 경보장치를 갖춘 출력유닛으로 이루어진다.The present invention for solving the above problems is a cylindrical outer cap is formed in the inner surface is opened at one end and the outer surface of the other end is provided with a concave-convex portion, and the storage groove is opened at one end in the inner surface Is formed and the outer surface of the other end is provided with a concave-convex portion is inserted into the receiving groove of the outer cap so that the concave-convex portion is exposed to the outside, the outer cap and the inner cap to maintain the closed state A crack detecting mechanism having a spring supporting the inner cap elastically and an input / output terminal formed in a pair and detachably installed on the outer cap and the inner cap to be energized with each other; A control unit connected to the input terminal and the output terminal to sense a separation between the input terminal and the output terminal; An input unit for controlling the operation of the control unit; Display device which is operated and controlled by the control unit to show the crack condition of the tunnel, and an alarm device which is operated and controlled by the control unit and installed at the entrance of the tunnel to send a danger signal to the driver of the vehicle passing in case of severe crack in the tunnel. It consists of an output unit equipped with.

이에 상기와 같은 본 발명에 따르면, 터널의 콘크리트에 다수 개의 균열감지기구가 설치되어, 어느 위치에, 어느 정도의 균열이 발생했는지를 관리자가 즉각적으로 확인할 수 있어, 터널의 균열 상태에 따라 적절한 조치를 신속하게 취할 수 있으며, 터널을 통행하는 운전자에게 터널의 균열 상태를 알려 줄 수 있어, 운전자가 안전운행을 할 수 있도록 유도할 수 있는 효과가 있다. Accordingly, according to the present invention as described above, a plurality of crack detection mechanisms are installed in the concrete of the tunnel, and the manager can immediately check how much cracking occurred at which position, and appropriate measures according to the crack state of the tunnel. It can be taken quickly and the driver who passes through the tunnel can be notified of the crack condition of the tunnel, so that the driver can drive safely.

이하 첨부도면에 의거하여 상세히 설명한다.Hereinafter will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 터널 내벽의 균열위치 확인 감지용 안전진단장치의 균열감지기구를 나타낸 단면도이고, 도 2는 본 발명에 따른 터널에 균열감지기구가 설치된 것을 나타낸 단면도이고, 도 3은 본 발명에 따른 안전진단장치의 구성요소간의 연결관계를 나타낸 구성도, 도 1 내지 도 3을 참조하여 본 발명에 따른 안전진단장치를 설명하면 다음과 같다.1 is a cross-sectional view showing a crack detection mechanism of the safety diagnosis device for detecting the crack position of the inner wall of the tunnel according to the present invention, Figure 2 is a cross-sectional view showing a crack detection mechanism is installed in the tunnel according to the present invention, Figure 3 Referring to the configuration of the connection between the components of the safety diagnosis device according to the invention, the safety diagnosis device according to the present invention with reference to Figures 1 to 3 as follows.

상기 안전진단 장치는, 터널(100)에 설치되어 터널(100)의 균열을 감지하는 균열감지기구(200)와, 상기 균열감지기구(200)와 연결되는 제어유닛(300)과, 상기 제어유닛(300)의 작동을 제어하는 입력유닛(400)과, 상기 제어유닛(300)에 의해 작동제어되는 출력유닛(500)으로 이루어진다.The safety diagnosis device is installed in the tunnel 100, the crack detection mechanism 200 for detecting the crack of the tunnel 100, the control unit 300 is connected to the crack detection mechanism 200, and the control unit It consists of an input unit 400 for controlling the operation of the 300, and an output unit 500 operationally controlled by the control unit 300.

삭제delete

상기 균열감지기구(200)는 캡슐형상으로, 외부캡(210)과, 외부캡(210)에 삽입되는 내부캡(220)과, 외부캡(210)과 내부캡(220)이 결속되도록 탄발고정하는 스프링(230)과, 외부캡(210)과 내부캡(220)에 각각 설치되는 한 쌍의 입·출력단자(240,250)로 구성되어, 터널(100)의 콘크리트(120)와 일체가 되도록 콘크리트(120)에 설치된다.The crack detection mechanism 200 is in the shape of a capsule, the outer cap 210, the inner cap 220 is inserted into the outer cap 210, the outer cap 210 and the inner cap 220 is fixed so as to bind the bullet Consists of a spring 230 and a pair of input and output terminals 240 and 250 installed in the outer cap 210 and the inner cap 220, respectively, to be integrated with the concrete 120 of the tunnel 100. It is installed at 120.

상기 외부캡(210)은, 내면에 한쪽 선단으로 개구된 수납홈(211)이 형성되고, 다른 한쪽 선단의 외면에 요철부(212)가 구비된다. 이때 상기 요철부(212)는 외부캡(210)이 콘크리트(120)에 밀착고정되도록 한다. The outer cap 210 has an accommodating groove 211 formed at one end thereof on an inner surface thereof, and an uneven portion 212 is provided at an outer surface of the other end thereof. At this time, the concave-convex portion 212 allows the outer cap 210 to be fixed in close contact with the concrete 120.

상기 내부캡(220)은, 내면에 한쪽 선단으로 개구된 수납홈(221)이 형성되고, 다른 한쪽 선단의 외면에 요철부(222)가 구비되어, 요철부(222)가 외부로 노출되도록 외부캡(210)의 수납홈(211)에 삽탈가능하게 삽입된다. 이때 상기 요철부(222)는 내부캡(220)이 콘크리트(120)에 밀착고정되도록 한다.The inner cap 220 is provided with an accommodating groove 221 formed at one end on an inner surface thereof, and an uneven portion 222 is provided on an outer surface of the other end thereof, so that the uneven portion 222 is exposed to the outside. Removably inserted into the receiving groove 211 of the cap (210). At this time, the uneven portion 222 is to ensure that the inner cap 220 is in close contact with the concrete (120).

상기 스프링(230)은, 일단이 외부캡(210)의 수납홈(212)에 고정되고 타단이 내부캡(220)의 수납홈(222)에 고정되어, 외부캡(210)과 내부캡(220)이 닫혀진 상태를 유지하도록 외부캡(210)과 내부캡(220)을 탄발지지한다.The spring 230, one end is fixed to the receiving groove 212 of the outer cap 210 and the other end is fixed to the receiving groove 222 of the inner cap 220, the outer cap 210 and the inner cap 220 ) And support the outer cap 210 and the inner cap 220 to maintain the closed state.

상기 입력단자(240)는 외부캡(210)의 수납홈(212)에 설치되고, 상기 출력단자(250)는 입력단자(240)와 맞대어지도록 내부캡(220)의 수납홈(222)에 설치된다. 따라서, 외부캡(210)과 내부캡(220)이 콘크리트(120)의 균열로 벌어지면, 입력단자(240)와 출력단자(300)가 이격되어, 상기 제어유닛(300)이 이를 감지한다.The input terminal 240 is installed in the receiving groove 212 of the outer cap 210, the output terminal 250 is installed in the receiving groove 222 of the inner cap 220 to be opposed to the input terminal 240. do. Therefore, when the outer cap 210 and the inner cap 220 are opened by the crack of the concrete 120, the input terminal 240 and the output terminal 300 is spaced apart, the control unit 300 detects this.

상기 제어유닛(300)은, 별도의 라인을 통해 입력단자(240) 및 출력단자(250) 와 연결되어, 입력단자(240)와 출력단자(250)가 이격되면 이를 감지하여, 터널(100)의 콘크리트(120)에 균열이 발생한 것을 파악한다. The control unit 300 is connected to the input terminal 240 and the output terminal 250 through a separate line, and detects when the input terminal 240 and the output terminal 250 is spaced, the tunnel 100 Figure out that the crack occurred in the concrete (120).

상기 입력유닛(400)은 제어유닛(300)을 작동제어하며, 필요시만 제어유닛(300)을 온 시켜 전력 낭비를 방지하게 한다.The input unit 400 operates to control the control unit 300, and when necessary, to turn on the control unit 300 to prevent waste of power.

상기 출력유닛(500)은 중앙통제실에 설치되는 디스플레이장치(510)와, 터널(100)의 입구 쪽에 설치되는 경보장치(520)로 구성된다.The output unit 500 includes a display device 510 installed in the central control room and an alarm device 520 installed at the entrance of the tunnel 100.

상기 디스플레이장치(510)는, 제어유닛(300)에 의해 작동제어되어, 터널(100)의 균열 상태를 시각적으로 관리자에게 인식시켜준다. 따라서, 관리자는 디스플레이장치(510)에 나타난 화면을 보고, 어느 위치에 균열이 심하게 발생했는지, 그 진행상태는 어느 정도 인지를 확인하여 터널(100)의 균열에 대해 적절한 조치를 취할 수 있다..The display device 510 is operated and controlled by the control unit 300 to visually recognize the crack state of the tunnel 100 to the manager. Therefore, the administrator may take appropriate measures for the crack of the tunnel 100 by looking at the screen displayed on the display apparatus 510, and confirming where the crack is severely generated and the progress of the crack.

상기 경보장치(520)는, 터널(100) 입구쪽에 설치되며 제어유닛(300)과 전기적으로 연결되어, 터널(100)의 균열 상태를 통행하는 운전자에게 알려준다. 즉, 상기 경보장치(520)는 녹색불 시는 안전, 노란불 시는 미세균열 발생, 빨간불 시는 위험을 나타내어, 운전자가 조심운전을 할 수 있도록 유도한다. 특히, 경보장치(520)는 터널(100)이 붕괴의 위험에 노출될 정도로 균열이 발생하게 되면 이를 즉각적으로 운전자에게 알려, 운전자가 터널(100) 내로 진입하지 않도록 한다. The alarm device 520 is installed at the entrance of the tunnel 100 and is electrically connected to the control unit 300 to inform the driver of the crack state of the tunnel 100. That is, the alarm device 520 is green light safety, yellow light micro-cracks occur, red light indicates the danger, inducing the driver to be careful driving. In particular, the alarm device 520 immediately informs the driver when a crack occurs to the extent that the tunnel 100 is exposed to the risk of collapse, thereby preventing the driver from entering the tunnel 100.

도 4는 본 발명에 따른 균열감지기구의 작동상태를 나타낸 작동도로서, 도 4를 참조하여, 본 발명에 따른 안전진단장치의 작용을 설명하면 다음과 같다.4 is an operation diagram showing an operating state of the crack detection mechanism according to the present invention. Referring to FIG. 4, the operation of the safety diagnosis device according to the present invention will be described below.

터널(100)이 장기간 사용으로 노후화가 진행되어, 터널(100)에 균열이 발생하게 되면, 터널(100) 내부에 설치된 각각의 균열감지기구(200a~200n))의 외부캡(210)과 내부캡(220)은 각각의 균열 벽면을 따라 이동하여, 입력단자(240)와 출력단자(250)가 이격된다. 이때 상기 제어유닛(300)은 각각의 균열감지기구(200)의 입력단자(240)와 출력단자(250)의 이격 여부를 감지하여, 터널(100)의 어느 부분에서 균열이 발생하였는지를 디스플레이장치(510)에 나타낸다. When the tunnel 100 ages due to long-term use and cracks occur in the tunnel 100, the outer cap 210 and the inner portion of each crack detection mechanism 200a to 200n installed inside the tunnel 100 are internal. The cap 220 moves along each crack wall, so that the input terminal 240 and the output terminal 250 are spaced apart. At this time, the control unit 300 detects the separation between the input terminal 240 and the output terminal 250 of each of the crack detection mechanism 200, the display device (1) in which part of the tunnel (100) cracks occurred ( 510).

한편, 제어유닛(300)은 터널의 균열 상태를 경보장치(520)에 나타내어, 운전자가 터널(100) 진입시 유의하도록 한다.On the other hand, the control unit 300 indicates the crack state of the tunnel to the alarm device 520, so that the driver to be careful when entering the tunnel 100.

상술한 바와 같이, 본 발명에 따른 안전진단장치는, 다수 개의 균열감지기구(200)가 터널에 설치되어, 어느 위치에, 어느 정도의 균열이 발생했는지를 관리자가 즉각적으로 확인할 수 있어, 터널의 균열 상태에 따라 신속하게 적절한 조치를 취할 수 있다. 또한, 상기 안전진단장치는 터널(100) 입구 쪽에 경보장치가 설치되어, 터널을 통행하는 운전자에게 터널의 균열 상태를 알려 줄 수 있어, 운전자가 안전운행을 할 수 있도록 유도할 수 있다. As described above, in the safety diagnosis apparatus according to the present invention, a plurality of crack detection mechanisms 200 are installed in a tunnel, and the manager can immediately check how much cracks have occurred at which position, and thus, Proper action can be taken quickly depending on the crack condition. In addition, the safety diagnosis device is provided with an alarm device at the entrance side of the tunnel 100, it can inform the driver of the tunnel through the tunnel state, it can induce the driver to drive safely.

도 1은 본 발명에 따른터널 내벽의 균열위치 확인 감지용 안전진단장치의 균열감지기구를 나타낸 단면도이고, 1 is a cross-sectional view showing a crack detection mechanism of the safety diagnosis device for detecting the crack position of the inner wall of the tunnel according to the present invention,

도 2는 본 발명에 따른 터널에 균열감지기구가 설치된 것을 나타낸 단면도이고, 2 is a cross-sectional view showing that the crack detection mechanism is installed in the tunnel according to the present invention,

도 3은 본 발명에 따른 안전진단장치의 구성요소간의 연결관계를 나타낸 구성도이고,3 is a block diagram showing a connection relationship between the components of the safety diagnostic device according to the present invention,

도 4는 본 발명에 따른 균열감지기구의 작동상태를 나타낸 작동도이다.4 is an operation diagram showing an operating state of the crack detection mechanism according to the present invention.

-첨부도면의 주요부분에 대한 용어설명-Explanation of terms for main parts of attached drawings

100; 터널 200; 균열감지기구100; Tunnel 200; Crack Detection Mechanism

300; 제어유닛 400; 입력유닛300; Control unit 400; Input unit

500; 출력유닛500; Output unit

Claims (1)

내면에 한쪽 선단으로 개구된 수납홈(211)이 형성되고 다른 한쪽 선단의 외면에 요철부(212)가 구비된 통형상의 외부캡(210)과, 내면에 한쪽 선단으로 개구된 수납홈(221)이 형성되고 다른 한쪽 선단의 외면에 요철부(222)가 구비되어 요철부(222)가 외부로 노출되도록 외부캡(210)의 수납홈(211)에 삽탈가능하게 삽입되는 통형상의 내부캡(220)과, 외부캡(210) 및 내부캡(220)이 닫혀진 상태를 유지하도록 외부캡(210)과 내부캡(220)을 탄발적으로 지지하는 스프링(230)과, 한 쌍을 이루며 외부캡(210) 및 내부캡(220)에 상호 착탈가능하게 설치되어 상호 통전되는 입·출력단자(240,250)을 갖춘 균열감지기구(200)와;A receiving groove 211 formed at one end on the inner surface thereof is formed, and a cylindrical outer cap 210 having an uneven portion 212 on the outer surface of the other tip, and a receiving groove 221 opened at one end on the inner surface thereof. ) Is formed and is provided with a concave-convex portion 222 on the outer surface of the other end to be inserted into the receiving groove 211 of the outer cap 210 so that the concave-convex portion 222 is exposed to the outside. 220 and the outer cap 210 and the inner cap 220, the spring 230 for elastically supporting the outer cap 210 and the inner cap 220 to maintain the closed state, in pairs with the outside A crack detection mechanism (200) having input and output terminals (240, 250) which are detachably installed on the cap (210) and the inner cap (220) and are energized with each other; 입력단자(240) 및 출력단자(250)와 연결되어, 입력단자(240)와 출력단자(250)의 이격을 감지하는 제어유닛(300)과;A control unit 300 connected to the input terminal 240 and the output terminal 250 to sense a separation between the input terminal 240 and the output terminal 250; 제어유닛(300)의 작동을 제어하는 입력유닛(400)과;An input unit 400 for controlling the operation of the control unit 300; 제어유닛(400)에 의해 작동제어되어 터널(100)의 균열 상태를 나타내는 디스플레이장치(510)와, 제어유닛(400)에 의해 작동제어되고 터널(100)의 입구 쪽에 설치되어 터널(100)에 심각한 균열이 발생하였을 경우 통행하는 차량의 운전자에게 위험신호를 보내는 경보장치(520)를 갖춘 출력유닛(500)The display device 510 which is operated and controlled by the control unit 400 to indicate the crack state of the tunnel 100, and is operated and controlled by the control unit 400 and installed at the entrance of the tunnel 100 to the tunnel 100. Output unit 500 equipped with an alarm device 520 that sends a danger signal to the driver of the vehicle passing when a serious crack occurs 으로 이루어진 것을 특징으로 하는 터널 내벽의 균열위치 확인 감지용 안전진단장치. Safety diagnosis device for detecting the crack position check of the inner wall of the tunnel.
KR1020080002215A 2008-01-08 2008-01-08 Safety testing device of tunnel KR100868058B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108374686A (en) * 2018-01-31 2018-08-07 青岛理工大学 A kind of mining safety device

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JPH10197296A (en) 1997-01-07 1998-07-31 Hitachi Eng & Services Co Ltd Regional monitoring system for soil or baserock collapse and central monitoring system
KR100373861B1 (en) 1999-12-30 2003-02-26 김충환 Device for detecting an abnormal transformation of facilities
KR200386339Y1 (en) 2005-03-25 2005-06-10 김동희 A destruction collapse alarm system
KR100553221B1 (en) 2003-12-05 2006-02-22 주식회사 지티씨 엔지니어링 Vibration expression displacement measuring instrument
KR100634487B1 (en) 2006-05-08 2006-10-19 (주)테스콤엔지니어링 Examin system for searching the crack in the tunnel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10197296A (en) 1997-01-07 1998-07-31 Hitachi Eng & Services Co Ltd Regional monitoring system for soil or baserock collapse and central monitoring system
KR100373861B1 (en) 1999-12-30 2003-02-26 김충환 Device for detecting an abnormal transformation of facilities
KR100553221B1 (en) 2003-12-05 2006-02-22 주식회사 지티씨 엔지니어링 Vibration expression displacement measuring instrument
KR200386339Y1 (en) 2005-03-25 2005-06-10 김동희 A destruction collapse alarm system
KR100634487B1 (en) 2006-05-08 2006-10-19 (주)테스콤엔지니어링 Examin system for searching the crack in the tunnel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108374686A (en) * 2018-01-31 2018-08-07 青岛理工大学 A kind of mining safety device

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