KR101421272B1 - Structure safety diagnosis equipment is bridge top board - Google Patents
Structure safety diagnosis equipment is bridge top board Download PDFInfo
- Publication number
- KR101421272B1 KR101421272B1 KR1020140027969A KR20140027969A KR101421272B1 KR 101421272 B1 KR101421272 B1 KR 101421272B1 KR 1020140027969 A KR1020140027969 A KR 1020140027969A KR 20140027969 A KR20140027969 A KR 20140027969A KR 101421272 B1 KR101421272 B1 KR 101421272B1
- Authority
- KR
- South Korea
- Prior art keywords
- vertical support
- adhesive
- bridge
- top plate
- potentiometer
- Prior art date
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/06—Arrangement, construction or bridging of expansion joints
- E01D19/065—Joints having sliding plates
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
-
- 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
- G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
- H01C17/22—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming
- H01C17/235—Initial adjustment of potentiometer parts for calibration
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
Description
The present invention can output accurate measured values because the load of the potentiometer maintains the current state without changing the length regardless of whether the bridge top plate moves downward or moves in the direction perpendicular to the throttling axis or moves simultaneously in the direction perpendicular to the throttling direction It is possible to greatly reduce the measurement error and predict the durability life and safety degree of the bridge through the result, so that the maintenance point can be determined easily, so that the bridge such as the collapse of the bridge can be prevented in advance. ≪ / RTI >
In the case of bridges commonly used for road structures, a number of bridging roofs are arranged in the longitudinal direction of the front and rear, and the connecting portions of the bridges are compressed and expanded due to the atmospheric temperature difference due to seasonal changes Or the left and right widths are irregularly moved by an external force.
Therefore, this change greatly affects the life or strength of the bridge. Therefore, it is necessary to check and check the facility manager from time to time to check whether there is an abnormality in the bridge. It is necessary to check the facility manager from time to time, It has been pointed out that ancillary problems due to accident risk and vehicle control have been pointed out.
In order to solve such a problem, the registered utility model No. 265797 entitled " Measurement system for safety diagnosis of road structures and bridges " is well known.
The above-mentioned " measurement system for safety diagnosis of road structures and bridges " is briefly described as follows. A scale plate, which is installed in a space between upper plates and has a graduation on its surface, is fixed in the longitudinal direction of the bridge, The measuring pin having the indicator needle is fixed in the longitudinal direction of the bridge with the fixture on the end side surface of the other upper plate while the scale plate and the indicator plate are positioned in the upward and downward directions to check the scale of the indicator indicated by the indicator needle The amount of displacement of the bridge, that is, the amount of expansion and contraction can be measured.
Korean Patent No. 10-0942060 discloses a bridge having a bridge for preventing departure of a bridge top plate. In brief, a first axis and a second axis provided with an angle sensor are fixed to an upper plate, respectively, , An air spring is fixed to both ends of the shaft, a pressure sensor is provided inside the air spring, and the control unit receives the measured values from the angle sensor and the pressure sensor and transmits the measured values to the output unit.
The above-mentioned prior art has a very advantageous advantage because it can easily measure the separation of the bridge top plate and confirm the safety of the bridge on the basis of the measured data.
However, in the case of the conventional art, when the bridge top plate is moved or moved in the direction perpendicular to the throttling axis, the distance between the bridge top plates does not actually change, but the length of the air spring changes correspondingly, Which can lead to misleading confusion of the bridge manager, and there is a fundamental serious problem in that the error is also considerably large and the measurement reliability is significantly lowered.
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and it is an object of the present invention to provide a potentiometer in which the load of the potentiometer can be changed without changing the length regardless of whether the bridge top plate is moved downward or in a direction perpendicular to the throttling axis, Since it maintains the current state, accurate measurement value can be outputted, and the measurement error can be greatly reduced. By estimating the durability and safety level of the bridge through the result, it is possible to easily determine the maintenance point, And to provide a safety diagnostic device for detecting a new joint of a bridge top plate which can be prevented.
According to an aspect of the present invention,
A first vertical support provided at one end of a bridge top plate or a fixing means installed at an alternate or pier;
A horizontal support table movably installed along the longitudinal direction of the first vertical support and orthogonal to each other;
A transport block movably installed along the longitudinal direction of the horizontal support;
A second vertical support disposed at one end of the bridge top plate or alternating or piercing means and spaced apart from and opposite to the first vertical support;
A potentiometer having one end fixed to the transport block and the other end fixed to the second vertical support to measure a linear displacement;
A temperature sensor for measuring an external temperature;
A controller for periodically and repeatedly outputting a linear displacement measurement value input through the potentiometer and a temperature measurement value inputted through a temperature sensor together with a measurement time; and an output unit for transmitting an output value from the control unit to an external recording medium; And a control unit.
Further, in the present invention,
A printer, or a portable memory.
Further, in the present invention, the transport block and the potentiometer are interconnected via a pivot.
Further, in the present invention,
A mounting base body;
A receiving part formed on one side of the mounting base body and receiving an adhesive;
An injection port communicating with the accommodating portion and capable of injecting an adhesive;
A discharge port communicating with the accommodating portion and discharging internal air when the adhesive is injected;
And a striking portion formed on a side surface of the mounting base body, the mounting base being installed by an adhesive.
Here, the adhesive type mounting base is provided with a fastening portion;
The first vertical support and the second vertical support are respectively provided with fastening bolts and are detachably fixed to the fastening portions.
The first vertical support and the second vertical support are detachably fixed to the adhesive mount via a bracket inserted and fixed at an end thereof via a fastening bolt.
Here, the adhesive type mounting base is provided with a coupling portion;
And the ends of the first vertical support and the second vertical support are inserted into the coupling part and fixed to each other via fastening bolts.
Here, the adhesive is characterized in that the adhesive is any one of silicone for quick-setting or epoxy for stone or ultra-fast-speed mortar.
Here, at least one of the fixing means,
And is a magnetic base having an operation lever for ON / OFF control of magnetic force generation.
According to this embodiment, the load of the potentiometer maintains the current state without changing the length regardless of whether the bridge top plate moves downward or moves in the direction perpendicular to the throttling axis, or when the downward movement and the movement in the direction perpendicular to the throttling axis occur simultaneously. It is possible to greatly reduce the measurement error, to prevent the damage (bending) of the rod, to output the accurate measurement value, and to expect the side effect that the maintenance is not necessary and the maintenance cost can be reduced accordingly can see.
In addition, according to the present embodiment, the bridge manager can store the measured result by month or year through the configuration of the potentiometer, the temperature sensor, the control unit, the storage unit, and the printer. When the result is different from the normal It is very useful to prevent the accident such as bridge collapse because it is easy to determine the maintenance point by predicting the durability life and safety degree of the bridge.
According to this embodiment, by connecting the rod of the transport block and the potentiometer to each other via the pivot, even when the bridge top plate is opened at an arbitrary angle, the receiving hole and the sphere of the pivot are correspondingly rotated, The bridge block or the potentiometer can be prevented from being damaged, thereby extending the service life of the product. Further, since the bridge manager does not have to check this from time to time, the waste of unnecessary labor It is advantageous in that the management is considerably facilitated.
In addition, according to the present embodiment, since the first and second vertical supports and the adhesive-type installation stand can be configured to be detachable from each other, it is possible to shorten the installation time and the disassembly time in the bridge top plate, And there is no need to forcibly separate the adhesive mount from the bridge top plate or the bridge or the shift, and there is an advantage that damage (breakage) to the bridge can be prevented.
Further, according to the present embodiment, when at least one magnetic base is applied to the first and second vertical supports instead of the adhesive mount, it is convenient that the bridge manager does not need to separately prepare or carry the adhesive, and when the adhesive is hardened The installation time can be shortened and the release time can be drastically shortened. Accordingly, it is possible to install and unlock even more the same operation time because the operation is very convenient. In particular, ) Is left, so there is an advantage that it can be maintained as the bridge itself.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front view showing a first construction example of a safety diagnosis apparatus for a bridge top plate expansion joint according to the present invention. Fig.
FIG. 2 is a perspective view showing a combined safety diagnosis apparatus for a joint of a bridge and a bridge according to the present invention. FIG.
3 is an exploded perspective view of Fig.
FIG. 4 is a bottom perspective view of a fixing unit of a safety diagnostic apparatus for detecting an expansion joint of a bridge top plate according to the present invention. FIG.
FIG. 5 and FIG. 6 are a front view and a bottom view showing an operation process of the safety diagnostic apparatus for detecting a joint of a bridge top plate according to the present invention.
7 is a view for explaining the operation relationship of the safety diagnosis apparatus according to a change between bridge top plates;
FIG. 8 is a block diagram showing the interrelationship between respective components in a safety diagnostic apparatus for detecting a joint of a bridge top plate expansion joint according to the present invention. FIG.
9 is a front view showing a second construction example of a safety diagnosis apparatus for a bridge top plate elastic expansion joint according to the present invention.
10 is a perspective view showing a third construction example of a safety diagnostic device for detecting a joint of a bridge top plate expansion joint according to the present invention.
11 is a view showing the first embodiment showing the coupling relationship between the vertical support and the adhesive-type installation in the safety diagnosis apparatus for detecting the expansion joint of a bridge top plate according to the present invention.
FIG. 12 is a second embodiment showing a coupling relationship between a vertical support and a adhesive-type installation in a safety diagnosis apparatus for a bridge top plate expansion joint detection according to the present invention. FIG.
FIG. 13 is a third embodiment showing a coupling relation between a vertical support and a adhesive-type installation in a safety diagnosis apparatus for a bridge top plate expansion joint detection according to the present invention. FIG.
FIG. 14 is a perspective view showing a magnetic base according to a second embodiment of the present invention in a fixing device of a safety diagnosis device for a bridge top plate expansion joint detection. FIG.
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
1 is a view showing a first construction example of a safety diagnosis apparatus for a bridge top plate expansion joint according to the present invention, FIG. 2 is an assembled perspective view of a safety diagnosis apparatus for a bridge top plate expansion joint detection according to the present invention, 4 is an exploded bottom perspective view of a fixing unit of a safety diagnostic apparatus for detecting a joint of a bridge top plate according to an embodiment of the present invention.
Referring to FIG. 1, a safety diagnostic apparatus according to an embodiment of the present invention includes first and second
In this case, the fixing means may be a sticking
2 and 3, the first
As an example, the first
2 and 3, the second vertical support 10 'is a member having a fixing part 11' on one side thereof and is provided perpendicular to the upper surface of the
In this embodiment, the engaging
As shown in FIG. 1, the second vertical support 10 'is fixed to an opposite bridge top plate on which the first
Referring to FIGS. 2 to 4, the fixing means, that is, the adhesive
For example, the
The mounting
A
According to the present embodiment, the adhesive FX injected through the
Meanwhile, the
Therefore, the convenience of the operation is greatly improved by the structure of the
Referring to FIGS. 1, 5 and 9, the adhesive FX may be any one of silicone for quick-setting or epoxy for a stone or a quick-setting mortar. In the case of the present embodiment, the adhesive FX may be an entirety of curing time, ease of handling, Considering the situation, a stone epoxy (a mixture of base and hardener in a ratio of 1: 1) was applied.
In the case of this embodiment, only the ultra fast silicone, the epoxy for the stone, and the ultra low speed mortar are described as the adhesive FX, but this is only one embodiment, and if it is possible to perform the same function, Any of which is applicable.
2 and 3, the
A
2 and 3, the
Here, it should be noted that the functions of the first
5, when the bridge upper plate provided with the first
6, when the bridge upper plate provided with the first
That is, the
2, 3 and 8, the
Since the
In this embodiment, the
2, 3 and 8, the
For reference, the
2 and 8, the
2, the
2 and 8, the
For example, the portable memory may be a portable memory such as a USB memory, an SD memory, an SDHC memory, a CF memory, a portable hard disk, and the like which can be easily and conveniently connected to the
In addition, the printer is a device that can record measurement time, linear displacement measurement value, and temperature value, which are received through the
The relationship between the
The length of the
The
FIGS. 5 to 7 are views showing the operation relationship of the safety diagnosis apparatus for detecting an expansion joint of a bridge top plate according to the present invention, and FIGS. 5 and 6 are views showing an operation relationship of a safety diagnosis apparatus for a bridge top plate expansion joint detection according to the present invention FIG. 7 is a view for explaining an action between the bridge top plate and the safety diagnosis apparatus. FIG.
FIG. 8 is a block diagram showing the interrelationship between respective components in the safety diagnostic apparatus for detecting an expansion joint of a bridge top plate according to the present invention, and FIG. 9 is a block diagram of a safety diagnosis apparatus for a bridge top plate expansion joint detection according to the present invention. FIG. 10 is a view showing a third construction example of the safety diagnosis apparatus for detecting the expansion joint of a bridge top plate according to the present invention. FIG.
The operation of the safety diagnosis apparatus according to the present invention will now be described with reference to the drawings.
First, as shown in FIG. 1, a safety diagnostic apparatus according to the present invention may be installed on a bridge top plate. More specifically, the
When the second vertical support 10 'is fixed to the opposite bridge top plate in the same manner as the first
The
If necessary, it is desirable to provide a bellows-type tarpaulin or a waterproof means capable of performing the same function as shown in Fig. 10 to protect the components from external pollution sources.
5, when the bridge top plate provided with the first
6, when the bridge upper plate provided with the first
That is, the
7 (a), when the temperature of the bridge top plate rises due to the solar heat as in the summer, the bridge top plate is elongated with the elongation due to the thermal expansion. As a result, the interval between the bridge top plates becomes narrow, The
In addition, the
The
On the other hand, referring to FIG. 7 (b), when the temperature of the bridge top plate is lowered as in winter, the elongation of the bridge top plate is changed and contracted. As a result, the interval between the bridge top plates becomes wider, The
In addition, the
The
9, the first
10, the first
Therefore, according to the present embodiment, the bridge manager can store the output value by month or year, and when the result is different from the normal year in the month of the specific year, the bridge manager predicts the durability life and safety degree of the bridge, It is very useful because an accident such as a bridge collapse can be prevented in advance.
Although not shown in detail, when the wired / wireless transmitter is connected to the
2 and 3, a
The pivot (100) includes a receiving hole (101) having a spherical groove therein and detachably coupled to the conveying block (40); And a
In one example, the
According to the present embodiment, even if the bridge top plate is opened at an arbitrary angle as described above, the receiving
11 to 13 are views showing different combinations between the vertical support and the adhesive-type installation stand, and Fig. 11 is a view showing a combination of the vertical support and the adhesive installation stand in the safety diagnosis device for the bridge top plate expansion joint detection according to the present invention. 12 is a view showing a second embodiment showing a coupling relationship between the vertical support and the adhesive-type installation in the safety diagnosis apparatus for a bridge top plate expansion joint detection according to the present invention, and Fig. 13 is a view FIG. 3 is a third embodiment showing a coupling relationship between a vertical support and a adhesive installation in a safety diagnostic apparatus for detecting joint expansion joints in a bridge top plate according to the present invention.
Note that in the present embodiment, the first and second
The first and second
11, the overall structure of the adhesive mounting table 20 is the same as that described above, except that the adhesive mounting table 20 is provided with a
According to the present embodiment, since the first and second
12, the first and second
According to the present embodiment, since the first and second
13, the
The shape of the engaging
According to the present embodiment, since the ends of the first and second
FIG. 14 is a perspective view of a magnetic base according to a second embodiment of the present invention. FIG.
Note that in the present embodiment, a magnetic base 20 'is applied to the first and second
The magnetic base 20 'is a mechanism having a strong magnetic force device at the bottom, and is also referred to as a magnet type bottom portion.
As shown in FIG. 14, the magnetic base 20 'is formed in a rectangular box shape as a whole, and an operation lever 21' for ON / OFF control of magnetic force generation is provided on the outer surface, And a fastening portion 22 'to which a fastening bolt B formed at one end of the
According to the present embodiment, when at least one of the magnetic bases 20 'is applied to the first and second
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. .
10: first vertical support 10 ': second vertical support 11: first guide groove
20: Adhesive mount 21: Mounting base body 22:
23: Inlet port 24: Discharge port 25:
26: fastening part 27: engaging part BK: bracket
20 ': Magnetic base 21': Operation lever 22 ': Fastening part
30: horizontal support 31: guide block 32: second guide groove
40: transfer block 50: potentiometer 51:
52: load 60: temperature sensor 70: indicator
71: control section 72: output section 90: recording medium
100: Pivot 101: Receiver 102: Sphere
FX: adhesive B: fastening bolt
Claims (9)
A horizontal support table movably installed along the longitudinal direction of the first vertical support and orthogonal to each other;
A transport block movably installed along the longitudinal direction of the horizontal support;
A second vertical support disposed at one end of the bridge top plate or alternating or piercing means and spaced apart from and opposite to the first vertical support;
A potentiometer having one end fixed to the transport block and the other end fixed to the second vertical support to measure a linear displacement;
A temperature sensor for measuring an external temperature;
A controller for periodically and repeatedly outputting a linear displacement measurement value input through the potentiometer and a temperature measurement value inputted through a temperature sensor together with a measurement time; and an output unit for transmitting an output value from the control unit to an external recording medium; And a safety diagnosis device for detecting the expansion joint of the bridge top plate.
The recording medium includes:
Wherein the apparatus is a printer or a portable memory.
Wherein the transport block and the potentiometer are interconnected via a pivot. ≪ Desc / Clms Page number 13 >
Wherein at least one of the fixing means comprises:
A mounting base body;
A receiving part formed on one side of the mounting base body and receiving an adhesive;
An injection port communicating with the accommodating portion and capable of injecting an adhesive;
A discharge port communicating with the accommodating portion and discharging internal air when the adhesive is injected;
And a striking portion formed on a side surface of the mounting base body, wherein the mounting base is an adhesive-type mounting base provided with an adhesive.
The adhesive type mounting base is provided with a fastening portion;
Wherein the first vertical support and the second vertical support are respectively provided with fastening bolts and are detachably fixed to the fastening portions.
Wherein the first vertical support and the second vertical support are detachably fixed through a fastening bolt by being brought into contact with the adhesive mount via a bracket inserted and fixed at an end thereof.
Wherein the adhesive mount is provided with an engaging portion;
Wherein the first vertical support and the second vertical support are inserted into the coupling part and fixed to each other via fastening bolts.
Wherein the adhesive is one of silicone for ultra fast-speed or epoxy for stone or ultra-quick-speed mortar.
Wherein at least one of the fixing means comprises:
Wherein the magnetic base is a magnetic base having an operation lever for ON / OFF control of magnetic force generation.
Priority Applications (1)
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KR1020140027969A KR101421272B1 (en) | 2014-03-10 | 2014-03-10 | Structure safety diagnosis equipment is bridge top board |
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KR1020140027969A KR101421272B1 (en) | 2014-03-10 | 2014-03-10 | Structure safety diagnosis equipment is bridge top board |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101562517B1 (en) | 2015-07-28 | 2015-10-26 | 주식회사 혜성안전기술원 | Concrete structure of crack safety measurement system |
KR101658480B1 (en) * | 2015-06-12 | 2016-09-22 | (주)성진지오텍 | Anchor for fixing railroad tie sensor |
KR101886309B1 (en) * | 2018-01-12 | 2018-08-09 | (주)양지 | Bridge displacement measurement system |
CN109610310A (en) * | 2018-12-12 | 2019-04-12 | 湖南大学 | Fashioned iron-UHPC combined bridge deck structure and its construction method suitable for cantilever position |
KR20210089471A (en) * | 2020-01-08 | 2021-07-16 | 재단법인 한국전자기계융합기술원 | Resistive Displacement Sensor for Monitoring Suspended Furnace Scaffolding Loads |
KR20220104963A (en) * | 2021-01-19 | 2022-07-26 | 서울시설공단 | Displacement trajectory measuring device of bridge behavior |
CN118640851A (en) * | 2024-08-14 | 2024-09-13 | 中裕铁信交通科技股份有限公司 | Bridge expansion joint real-time monitoring device and monitoring method |
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KR20090130555A (en) * | 2008-06-16 | 2009-12-24 | 김경운 | Device for lifting upper structure of bridge |
KR100942060B1 (en) | 2008-11-05 | 2010-02-11 | 주식회사 한일엔지니어링 | A bridge device abutment for bridge expansion and contraction abnormal noise department |
JP2013147834A (en) | 2012-01-18 | 2013-08-01 | Hanshin Expressway Engineering Co Ltd | Crack monitoring method and system for bridge |
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KR20030058816A (en) * | 2002-01-02 | 2003-07-07 | 주식회사 광국실업 | Measuring device for a bridge constuction |
KR20090130555A (en) * | 2008-06-16 | 2009-12-24 | 김경운 | Device for lifting upper structure of bridge |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101658480B1 (en) * | 2015-06-12 | 2016-09-22 | (주)성진지오텍 | Anchor for fixing railroad tie sensor |
KR101562517B1 (en) | 2015-07-28 | 2015-10-26 | 주식회사 혜성안전기술원 | Concrete structure of crack safety measurement system |
KR101886309B1 (en) * | 2018-01-12 | 2018-08-09 | (주)양지 | Bridge displacement measurement system |
CN109610310A (en) * | 2018-12-12 | 2019-04-12 | 湖南大学 | Fashioned iron-UHPC combined bridge deck structure and its construction method suitable for cantilever position |
KR20210089471A (en) * | 2020-01-08 | 2021-07-16 | 재단법인 한국전자기계융합기술원 | Resistive Displacement Sensor for Monitoring Suspended Furnace Scaffolding Loads |
KR102304686B1 (en) * | 2020-01-08 | 2021-09-23 | 재단법인 한국전자기계융합기술원 | Resistive Displacement Sensor for Monitoring Suspended Furnace Scaffolding Loads |
KR20220104963A (en) * | 2021-01-19 | 2022-07-26 | 서울시설공단 | Displacement trajectory measuring device of bridge behavior |
KR102512815B1 (en) | 2021-01-19 | 2023-03-22 | 서울시설공단 | Displacement trajectory measuring device of bridge behavior |
CN118640851A (en) * | 2024-08-14 | 2024-09-13 | 中裕铁信交通科技股份有限公司 | Bridge expansion joint real-time monitoring device and monitoring method |
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