KR101546367B1 - Device for realtime measuring proceeding concrete crack - Google Patents

Device for realtime measuring proceeding concrete crack Download PDF

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Publication number
KR101546367B1
KR101546367B1 KR1020150062769A KR20150062769A KR101546367B1 KR 101546367 B1 KR101546367 B1 KR 101546367B1 KR 1020150062769 A KR1020150062769 A KR 1020150062769A KR 20150062769 A KR20150062769 A KR 20150062769A KR 101546367 B1 KR101546367 B1 KR 101546367B1
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South Korea
Prior art keywords
crack
concrete
sensor
cracks
width
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KR1020150062769A
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Korean (ko)
Inventor
김인석
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주식회사 삼림엔지니어링
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/14—Receivers specially adapted for specific applications
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

The present invention relates to a device for measuring the progress of concrete cracks for safety on a real time basis installed on the cracked portions of a concrete structure. The purpose of the present invention is to measure the progress of the cracks of the concrete structure on a real time basis and enable an administrator in a remote place to diagnose the cracks and reinforce the cracks rapidly by checking the measured values on a real time basis. The device for measuring the progress of the concrete cracks for safety on a real time basis according to the present invention includes a fixing stand (10) fixated to a first concrete part (1) on one side of the cracks (3); a crack movable piece (20) with one end fixated to the fixing stand and the other end supported by a second concrete unit (2) in the other side of the cracks after crossing the cracks to slide according to the movement of the concrete structure; a sensor rail (30) installed on the second concrete unit in the other side of the cracks in a direction perpendicular to the crack movable piece; width sensors installed on the sensor rail at a predetermined intervals; a sliding sensor plate (50) joined to the center of an inclined guide groove (51) to slide the crack movable piece and successively turning on the width sensors using a switch terminal (52) while sliding in the direction perpendicular to the crack movable piece in case of the movement of the first and second concrete units due to a change in the cracks; a controller sensing a change in a contact point of the width sensors and informing the administrator in the remote plate about the progress of the cracks of the concrete structure by transmitting the sensed value to a server and a portable terminal of the administrator through a communication module; a GPS module (80) installed in the fixing stand or sensor rail and informing a geological location through satellite communication; and a power source unit (61) applying power to the width sensors and controller.

Description

TECHNICAL FIELD [0001] The present invention relates to a device for measuring crack progress in a real-time concrete,

The present invention relates to a concrete crack measuring instrument, more particularly, to a concrete crack measuring instrument installed in a crack part of a concrete structure, real-time measurement of a crack progress of a concrete structure, real- To a measuring instrument for safety diagnosis of crack progression.

Concrete structures commonly used in buildings, tunnels, bridges, etc. are damaged and aged over time. In order to maintain the function of the damaged and deteriorated concrete structure and to prolong its life, continuous maintenance and inspection of the concrete structure are necessary.

The most basic investigation in the inspection of concrete structures is the appearance survey, and the investigation of the cracks on the surface of the concrete structure in the appearance survey is very important factor in judging whether the precise safety diagnosis of the concrete structure is carried out.

Concrete is a composite material using cement, coarse aggregate, fine aggregate, mineral admixtures for concrete, and chemical admixtures for concrete and has high compressive strength.

In addition, concrete has a relatively low tensile strength (generally 1/10 of the compressive strength).

Generally, considering the fact that the tensile stress acting on the concrete structure exceeds the tensile strength and the cracks occur, the concrete can be treated as a relatively weak tensile stressed material.

Also, since the shrinkage corresponding to about 1% of the absolute volume occurs during the curing process, which is the most important role in the curing of the concrete, the aggregate which does not cause shrinkage and the shrinkage cement paste interface A tensile force may be generated.

In addition, cracks are generated in the structure when deformation or variation occurs in the concrete after the concrete starts to solidify. These cracks sometimes occur inside the member and may not be seen as a surface test. They form blisters inside the concrete, which causes both winter damage in the winter and corrosion of the rebar.

When a crack occurs in relation to the load during deformation of the form, the time of occurrence of the initial crack, the load at the time of cracking, and the crack width should be measured.

Conventionally, a concrete load is applied to the concrete for inspection, and then it is visually inspected and inspected. Then, a load is applied again and the inspection is performed again. However, this method is disadvantageous in that it is dangerous and the measurement value is different according to the individual difference of the measurer, and it is difficult to measure the accurate and accurate crack width because the subject of the measurer intervenes.

Recently, a method for measuring the cracks on the surface of concrete structures has been carried out through an imaging technique using advanced imaging equipment.

However, the load and the crack width have to be measured separately, and a processing board has to be separately provided. Conventional equipments are not only expensive but also have disadvantages such as being mounted on a vehicle or accompanied by self-moving transportation means, There is a disadvantage that it is difficult for the user in the field to measure the cracks on the surface of the concrete structure in real time according to the situation of the site.

Patent Document 1 (Japanese Patent Laid-Open No. 10-2005-0048059) discloses a crack propagation measuring device for measuring the progress of cracks on a surface of a concrete, comprising: A body case integrally formed with a cantilevered fixing part across the crack; A slide member attached to the surface of the other concrete centering on the crack and installed to be slidable along a bottom surface of the fixing unit; A plurality of sensor terminals provided at a predetermined distance from the bottom end of the fixing portion and connected to light emitting elements of different colors and a plurality of sensor terminals provided on an upper surface of the slide member, A sensor unit including a sensor contact plate on which an inclined portion is formed; And a power connection terminal and a power supply connection conductor provided on a bottom surface of the fixing part and on the upper surface of the slide member so as to be able to apply power to the sensor contact plate and the sensor terminal. As the slide member moves to the right side, the inclined portion of the sensor contact plate is sequentially connected to the sensor terminals to sequentially emit light of different color, so that the measurer can perform cracking according to the number of light- However, it is impossible to measure the crack depth due to the contact between the sensor plate and the sensor. However, it is impossible to measure the crack depth due to structural malfunction.

Published Patent No. 10-2005-0048059

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a real-time concrete structure which is installed in a crack part of a concrete structure and measures the crack progress of the concrete structure in real time, And to provide a measuring instrument for safety diagnosis of crack propagation of the crack.

The measuring device for crack initiation safety diagnosis of a real-time concrete according to the present invention comprises: a fixture fixed to a first concrete part on one side with a crack as a center; A cracking motion piece which is fixed to one side of the fixing block and the other side of which is slidably supported by the second concrete portion of the other side after the cracks are traversed according to the behavior of the concrete; A sensor rail installed at a concrete portion of the other side in a direction orthogonal to the crack behavior piece; A sensor installed at the sensor rail at a predetermined distance from each other; The crack moving piece is slidably coupled to the center of the slant type guide groove and slides in a direction orthogonal to the cracking motion piece when the first and second concrete parts move in accordance with the change of the crack, A slide type sensor plate; A controller for detecting a change in the contact point of the sensor and transmitting the detected value to a server and a portable terminal of a manager via a communication module to remotely inform the progress of the crack of the concrete structure; A GPS module installed on the fixed bar or the sensor rail and informing the geographical location through satellite communication; And a power unit for applying power to the sensor and the controller.

According to the measuring instrument for the crack progress safety diagnosis of the real-time concrete according to the present invention, the structure of the measuring device is simple and simple to use by using the cracking motion piece and the slide-type sensor plate moving in mutually orthogonal directions, Thereby improving reliability as a crack progress measuring instrument.

Also, since the depth of the crack can be measured by measuring the width of the crack, it is possible to confirm the progress of the crack. Therefore, the safety of the concrete structure is secured through the repair according to the progress of the crack.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an installation state and operational state of a measuring instrument for crack progress safety diagnosis of real-time concrete according to the present invention. FIG.
2 is a view showing an example in which crack depth measuring means is applied to a measuring instrument for crack propagation safety diagnosis of real-time concrete according to the present invention.

As shown in FIG. 1, the measuring device for the crack progress safety diagnosis of the real-time concrete according to the present invention comprises: a fixing table 10 fixed to a first concrete part 1 on the side of a crack; A cracking motion piece 20 which is fixed to the fixing table 10 at one side and is slidably supported at the second concrete section 2 at the other side after the crack 3 is traversed according to the behavior of the concrete; A sensor rail 30 installed on the second concrete part 2 in a direction perpendicular to the cracking piece 20; A width sensor module 40 installed on the sensor rail 30 at a predetermined distance from each other; A slide type sensor plate 50 installed on the second concrete part 2 so as to slide in a direction orthogonal to the cracking piece 20 and for turning on the width sensors 41, 41n of the width sensor module 40, ; And a controller 60 for confirming a crack change through the width sensors 41, 41n which are brought into contact with the slide type sensor plate 50.

The fixing table 10 is fixed to the surface of the first concrete part 1 through an adhesive or an anchor.

The other end of the cracking piece 20 is formed in a guide groove 51 formed in an inclined shape of the slide type sensor plate 50 And the sliding type sensor plate 50 is slid when one or more of the first and second concrete units 1 and 2 is in motion. That is, when the first concrete part 1 is in motion, the cracking motion piece 20 slides on the slide-type sensor plate 50 while moving due to the behavior of the first concrete part 1, The slide type sensor plate 50 slides while using the cracking piece 20 as a guide, that is, the change of the crack width is measured in real time even if any one of the first and second concrete portions 1 and 2 behaves.

The sensor rail 30 is provided with a plurality of width sensors 41, 41 n of the width sensor module 40 and is disposed close to the slide-type sensor plate 50 and is connected to the second concrete portion 2 through an adhesive or the like Respectively.

The sensor rail 30 is installed in the second concrete part 2 through a base plate 30 to be described later.

The width sensor module 40 is arranged such that a plurality of width sensors 41, 41n are arranged in a direction perpendicular to the behavior of the first and second concrete sections 1, 2 do. The width sensors 41, 41 n of the width sensor module 40 are brought into on-contact by a switch end 52 mounted on the slide-type sensor plate 50.

The width sensors disposed at the center among the plurality of width sensors 41, 41n are provided to correspond to the switch ends 52 of the slide-type sensor plate 50, that is, the first and second concrete sections 1, (Behavior in the direction in which the width of the crack increases and behavior in the direction in which the width of the crack is narrowed).

A plurality of width sensors 41, 41n of the width sensor module 40 can be attached to the sensor rail 30 through one band and can be attached to the sensor rail 30 particularly in the field, So that it can be confirmed accurately.

The sensor of the width sensor module 40 and the switch end 53 of the slide type sensor plate 50 can be of any shape capable of changing the contact point. For example, when the switch end 53 mechanically presses the width sensor Contact type when the width sensor corresponds to the switch stage 53 as an optical sensor, and the like.

The slide type sensor plate 50 is a plate material provided with an inclined guide groove 51 and a switch end 52 and is installed on the surface of the second concrete portion 2 through a separate base plate 53.

A rail is formed on the base plate 53 in a direction orthogonal to the direction of movement of the cracking piece 20 so that the slide type sensor plate 50 slides in a direction orthogonal to the cracking piece 20, The plurality of width sensors 41, 41 n are sequentially brought into on-contact.

Since the base plate 53 is fixed to the second concrete part 2, a rail 54 for guiding the lateral behavior of the cracking piece 20 is provided.

That is, since all the components installed in the second concrete part 2 are installed through the base plate 53, the construction is very easy.

The cracking piece 20 detects the bi-directional behavior of the first and second concrete parts 1 and 2, as described above, with the initial value being set at the center of the guide groove 51.

The controller 60 confirms the change of the crack through the width sensor which is connected to the plurality of width sensors 41, 41n by wire or wireless connection and is turned on by the switch end 52 of the slide type sensor plate 50 The crack width corresponding to each width sensor is stored in the memory, and the crack width is checked by checking the width of the width sensor by the width sensor stored in the memory in real time. For example, when the first width sensor is set to an initial value and the second width sensor (stored in the memory as 2 cm in the memory) is turned on, the value of the crack width corresponding to the second width sensor stored in the memory is 2 cm .

The controller 60 may be installed on the fixed sensor rail 30 or the fixed table 10.

The controller 60 transmits the crack measurement value to the server 70 and the portable terminal 71 of the manager through wireless communication and the remote manager checks the value transmitted from the controller 60 to determine the concrete structure.

In the present invention, a GPS module 80 is installed to inform the manager of the geographical position information of the measuring instrument.

The GPS module 80 is installed in the fixed table 10 or the base plate 53 and operated.

In the drawing, reference numeral 61 denotes a power supply unit for supplying power to the width sensor module 40, the controller 60, and the like. The power supply unit 61 may be a battery, a rechargeable battery, a solar cell that converts solar energy into electrical energy, stores it, and supplies it.

The operation of the measuring instrument for the crack progress safety diagnosis of the real time concrete according to the present invention is as follows.

1 is an initial state in which the measuring instrument according to the present invention is installed, and the slide type sensor plate 50 corresponds to a sensor in which the switch end is disposed at the center among the width sensors of the width sensor module 40. At this time, the width of the crack 3 is measured and managed in advance.

For example, when the first concrete part 1 moves to the left side of the drawing as shown in the lower drawing of FIG. 1, the cracking piece 20 moves to the left with the fixing table 10, Shaped sensor plate 50 is connected to the inclined guide groove 51 of the slide-type sensor plate 50, the slide-type sensor plate 50 moves upward in reference to the drawing when the cracking piece 20 moves to the left.

When the slide-type sensor plate 50 rises and the switch stage 53 corresponds to the upper width sensor, the width sensor contacts and the controller 60 confirms the progress of the crack through the contact change of the width sensor And confirms crack progression based on previously stored information.

FIG. 2 shows an example in which the depth of cracks is also measured. A guide hole 21 is formed in the cracking piece 20 so as to pass through in the vertical direction. The cracking piece 20 is provided so that the guide hole 21 is disposed at the center of the crack 3. [

In the guide hole 21, a crack depth measurement bench 90 is provided. The guide hole 21 is formed to have the same width as the width of the crack depth measurement bench 90 to guide the lowering of the crack depth measurement bench 90 and to allow the short crack behavior 20 to linearly move left and right So that the crack depth measuring unit 90 does not move linearly to the left or right even if the cracking piece 20 moves linearly to the left or to the right.

The crack depth measurement bench 90 is installed to be supported at the bottom of the inner side of the crack 3 through the press table 91. For example, the press table 91 is provided with a shaft pin 92 And the end of the crack depth measurement bench 90 is elastically supported by the torsion coil spring so as to come into contact with the bottom of the crack 3.

The crack depth measuring table 90 is moved in the direction of the axis of the pin 91 connected to the pressing pad 91 or the pressing pin 91 connected to the pressing pad 91, A hole 94 larger than the hole 93 is formed.

Therefore, the crack depth measurement bench 90 is lowered in correspondence with the depth change of the crack 3, and the change of the depth of the crack 3 is detected based on the descent of the crack depth measurement bench 90, (22) and a depth-width sensor module (95).

The switch stage 22 is formed on the upper surface of the cracking piece 20 and the depth width sensor module 95 is a band having a multi-stage depth sensor, 22).

The depth sensor module 95 is attached to the crack depth measurement bench 90 in the field so that it is preferable to set the initial value so that the depth change can be easily confirmed even when the depth of the crack 3 is different. For example, the depth sensor of the lowest one of the multi-stage depth sensors corresponds to the switch stage 22.

The switch stage 22 and the depth sensor module 95 may be of the same type as the switch stage 52 and the width sensor module 40 described above and may include a change in contact due to mechanical contact, Various methods are possible.

The depth sensor module 95 is connected to the controller 60 through a wireless or wired system to transmit the depth variation of the crack 3 and the controller 60 can detect cracks (3), for example, the spacing between the multi-tiered depth sensors is a change in the depth of the crack (3).

10: fixed bed, 20: cracking behavior piece
30: sensor rail, 40: width sensor module
50: slide type sensor plate, 60: controller
61: power supply unit, 70: server
71: terminal, 80: GPS module
90: Crack depth measurement stand,

Claims (3)

A fixing table 10 fixed to one side of the first concrete part 1 centered on the crack 3;
A cracking motion piece 20 which is fixed to one side of the fixing block and the other side of which is slidably supported by the second concrete portion 2 on the other side in accordance with the behavior of the concrete after crossing the crack;
A sensor rail (30) installed on a concrete portion of the other side in a direction orthogonal to the cracking motion piece;
A width sensor disposed at a distance from the sensor rail;
The crack moving piece is slidably coupled to the center of the inclined guide groove 51 and is slid in a direction orthogonal to the cracking motion piece when the first and second concrete parts move according to the change of the crack, A slide type sensor plate (50) for sequentially activating the width sensors;
A controller (60) for detecting a change in the contact point of the width sensor and transmitting the sensed value to a server and a portable terminal of a manager through a communication module to remotely inform the progress of the crack of the concrete structure;
A GPS module 80 installed on the fixed or sensor rails and informing the geographical location through satellite communication;
And a power supply unit (61) for applying power to the width sensor and the controller. [2] The apparatus according to claim 1, further comprising: a crack depth measurement bench (90) installed vertically in a guide hole penetrating through the cracking piece in the vertical direction and having an end supported inside a crack between the first and second concrete parts; One side of which is rotatably fixed to the fixing table and the other side of which is rotatably connected to the crack depth measuring table and which supports the crack depth measuring table to be inserted into the crack through the elastic member, ; And a depth sensor installed at the cracking piece and the crack depth measuring table in a multi-stage manner to measure a change in crack depth. The measuring instrument according to claim 2, wherein the width sensor and the depth sensor are attached to the sensor rail and the crack depth measuring table, respectively, in the form of a strip.
KR1020150062769A 2015-05-04 2015-05-04 Device for realtime measuring proceeding concrete crack KR101546367B1 (en)

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101721821B1 (en) 2017-02-03 2017-03-30 신윤섭 Sensor device for detecting crack growth of concrete structure
KR101901838B1 (en) * 2018-02-22 2018-09-27 신윤섭 Concrete Crack Propagation Detector with 3D Measurement
CN109870101A (en) * 2019-01-23 2019-06-11 河北钢铁集团矿业有限公司 Slope of stope deformation real-time monitoring system based on satellite positioning
CN109883292A (en) * 2019-03-26 2019-06-14 上海同济检测技术有限公司 Coagulation great soil group structure member crevices width is qualitative and Quantitative Monitoring device and method
KR101957299B1 (en) * 2018-10-08 2019-07-04 서현이앤씨 주식회사 Safety inspection device for checking the crack length of structure and crack length checking device of structure using this
KR102230165B1 (en) * 2020-10-21 2021-03-18 김보현 Fine metric crack gauge
KR102253275B1 (en) 2020-12-28 2021-05-20 주식회사 가람기술안전이앤씨 Progressive Concrete Crack Measurement Device
KR102334003B1 (en) * 2021-04-30 2021-12-02 주식회사 한국시설물안전연구원 Crack measurement device for safety diagnosis of facilities with easy measurement of crack information
KR102339242B1 (en) 2021-07-01 2021-12-14 주식회사 피오에스이앤씨 Concrete swelling damage measuring device
KR20220045498A (en) 2020-10-05 2022-04-12 주식회사 한국건설방재연구원 Apparatus for Integrity Assessment of Concrete with Diagnostic Positioning System
CN114353713A (en) * 2021-12-29 2022-04-15 山东省交通科学研究院 Low-power-consumption bridge surface crack detection device and method with sundry cleaning function
KR102417776B1 (en) 2022-02-09 2022-07-06 (주)케이에스알큰사람 Triaxial concrete crack gauge
CN115752249A (en) * 2022-11-03 2023-03-07 东营市勘察测绘院 Bridge crack measuring device
KR102507167B1 (en) * 2022-04-15 2023-03-07 주식회사 모아이앤씨 Crack Measurement Device for Safety Inspection of Facilities
CN116812800A (en) * 2023-08-30 2023-09-29 中国水利水电第七工程局有限公司 Slip form anti-cracking test control device, system and method
KR102584279B1 (en) 2022-07-13 2023-10-05 주식회사 동진이앤씨 Crack Variation Measuring Jig for Structural Safety Check

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KR200342887Y1 (en) 2003-11-18 2004-02-19 에스큐엔지니어링(주) Device for measuring a proceeding concrete crack
KR200348071Y1 (en) 2004-01-09 2004-04-28 주식회사 삼림엔지니어링 Flow measure apparatus for safety check-up of construction

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Publication number Priority date Publication date Assignee Title
KR200342887Y1 (en) 2003-11-18 2004-02-19 에스큐엔지니어링(주) Device for measuring a proceeding concrete crack
KR200348071Y1 (en) 2004-01-09 2004-04-28 주식회사 삼림엔지니어링 Flow measure apparatus for safety check-up of construction

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101721821B1 (en) 2017-02-03 2017-03-30 신윤섭 Sensor device for detecting crack growth of concrete structure
KR101901838B1 (en) * 2018-02-22 2018-09-27 신윤섭 Concrete Crack Propagation Detector with 3D Measurement
KR101957299B1 (en) * 2018-10-08 2019-07-04 서현이앤씨 주식회사 Safety inspection device for checking the crack length of structure and crack length checking device of structure using this
CN109870101A (en) * 2019-01-23 2019-06-11 河北钢铁集团矿业有限公司 Slope of stope deformation real-time monitoring system based on satellite positioning
CN109883292A (en) * 2019-03-26 2019-06-14 上海同济检测技术有限公司 Coagulation great soil group structure member crevices width is qualitative and Quantitative Monitoring device and method
KR20220045498A (en) 2020-10-05 2022-04-12 주식회사 한국건설방재연구원 Apparatus for Integrity Assessment of Concrete with Diagnostic Positioning System
KR102230165B1 (en) * 2020-10-21 2021-03-18 김보현 Fine metric crack gauge
KR102253275B1 (en) 2020-12-28 2021-05-20 주식회사 가람기술안전이앤씨 Progressive Concrete Crack Measurement Device
KR102334003B1 (en) * 2021-04-30 2021-12-02 주식회사 한국시설물안전연구원 Crack measurement device for safety diagnosis of facilities with easy measurement of crack information
KR102339242B1 (en) 2021-07-01 2021-12-14 주식회사 피오에스이앤씨 Concrete swelling damage measuring device
CN114353713A (en) * 2021-12-29 2022-04-15 山东省交通科学研究院 Low-power-consumption bridge surface crack detection device and method with sundry cleaning function
CN114353713B (en) * 2021-12-29 2023-09-05 山东省交通科学研究院 Low-power consumption bridge surface crack detection device and method with sundry cleaning function
KR102417776B1 (en) 2022-02-09 2022-07-06 (주)케이에스알큰사람 Triaxial concrete crack gauge
KR102507167B1 (en) * 2022-04-15 2023-03-07 주식회사 모아이앤씨 Crack Measurement Device for Safety Inspection of Facilities
KR102584279B1 (en) 2022-07-13 2023-10-05 주식회사 동진이앤씨 Crack Variation Measuring Jig for Structural Safety Check
CN115752249A (en) * 2022-11-03 2023-03-07 东营市勘察测绘院 Bridge crack measuring device
CN115752249B (en) * 2022-11-03 2023-06-16 东营市勘察测绘院 Bridge crack measuring device
CN116812800A (en) * 2023-08-30 2023-09-29 中国水利水电第七工程局有限公司 Slip form anti-cracking test control device, system and method
CN116812800B (en) * 2023-08-30 2023-12-01 中国水利水电第七工程局有限公司 Slip form anti-cracking test control device, system and method

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