KR102320599B1 - an apparatus for measuring reflection of a structure - Google Patents

Abstract

Provided is an apparatus for measuring reflection of a structure, comprising: a wire connecting barriers on both sides to each other in a box-shaped girder put on an upper side of a first point and a second point; a first clamp fixed on a first barrier of the two barriers on both sides and connected to one end unit of the wire; a second clamp fixed on a second barrier, which is the other of the two barriers on both sides, and fixed on the other end unit of the wire; a displacement measuring unit installed on the center between the barriers on both sides on a bottom surface in the box-shaped girder and measuring the reflection of the box-shaped girder from the wire; and a tension control unit placed between a third barrier, which is placed between the first barrier and the second barrier, and the first clamp, and engaged with one end unit of the wire, and applying tension to the wire within a preset range. The present invention aims to provide an apparatus for measuring the reflection of a structure, which is capable of remarkably reducing measurement errors.

Description

Structure deflection measuring device {an apparatus for measuring reflection of a structure}

The present invention relates to an apparatus for measuring the amount of deflection of a structure, and to an apparatus for measuring the amount of deflection of a structure capable of measuring the degree of deflection of a structure by a load.

The construction of infrastructure has increased along with the industrial development, but in recent years, as the facilities built in the early stages enter the aging stage, their safety is emerging as a social problem.

The collapse of infrastructure is not only an economic problem, but also has a huge social impact and loss of human life. For this reason, interest in the field of safety evaluation of structures has recently been very high. In particular, bridges in public use are designed and constructed according to various structural design standards, so they have wide variability in live load capacity, and structural conditions of the bridge change depending on various factors such as the condition of the structure and the variability of passing vehicles. In addition, the decrease in durability due to environmental or physical influences continuously reduces the load-bearing capacity of the bridge. In order to analyze these causes and rationally perform more efficient bridge operation and maintenance through the evaluation of the usability and safety of the bridge, the need to evaluate the live load capacity of the bridge in use, that is, the load carrying capacity, is increasing day by day.

That is, by considering factors that directly/indirectly affect the load-bearing capacity of the bridge structure, such as continuous repetitive load, change in traffic volume, change in vehicle shape (axial load), and deterioration of structure, the common load-bearing capacity of the target bridge The evaluation method is the ultimate goal of the bridge load-bearing capacity evaluation. On the other hand, there are two methods for calculating the load-bearing capacity of a bridge: the method of adopting the basic load-bearing capacity as the common load-bearing capacity, and the method of adopting the corrected load-bearing capacity corrected using the bridge condition, traffic volume, and load test results as the common load-bearing capacity. In the case of the United States and Europe, the former is adopted, while Korea and Japan are using the latter. The load carrying capacity evaluation method generally applied in Korea can be divided into the load carrying capacity evaluation method by the allowable stress design method and the load carrying capacity evaluation method by the strength design method according to the applied design method. Currently, when applied to road bridges and railroad bridges, the load-bearing capacity evaluation method according to the allowable stress design method is applied in the case of steel bridges, and the load-bearing capacity evaluation method according to the strength design method is generally applied in the case of concrete bridges.

The load test is an experimental method to analyze the behavior of a bridge. According to the prescribed regulations, a load determined in a size that does not affect the elastic behavior of the bridge is directly applied to a specific part of the bridge, and the actual performance of the main members of the bridge is applied. It is a test to observe and measure the behavior. The purpose of the load test is to quantify the actual load-bearing capacity of the bridge, and the results of the load test are applied to supplement the load-bearing capacity of the bridge evaluated by a theoretical method.

When measuring the deflection of a bridge during the load test, it is difficult to install a floating point on the upper part of the scaffold in a place with a high bridge height such as a valley. There is a problem that there is a problem that a large error occurs, and when the shape space is a river or the sea, it is impossible to install a floating point, or even if a similar floating point is installed, the measurement error occurs very large due to the influence of the flow velocity of the river, the influence of sea currents, and the buoyancy. The reliability of the data can be a big problem. In addition, in the case of an elevated bridge that crosses a road or railroad at the bottom, a load test is conducted at night when lower traffic control is required to measure deflection or when traffic control is not possible, economical and time loss occur.

Korean Patent Publication No. 10-1941076 (registered on January 16, 2019)

The present invention is to solve such a problem, and more specifically, a wire that can maintain a constant height is connected to the bulkhead of the inner abutment and pier position of the box-type girder, and the amount of deflection of the structure capable of measuring the displacement of the girder for this The purpose is to provide a measuring device.

The present invention for performing the above object is a wire connecting the bulkhead between the two points inside the steel box-type girder; a first clamp to which one end of the wire is connected while being fixed to the first bulkhead, which is one of the partitions on both sides; a second clamp to which the other end of the wire is fixed while being fixed to the second bulkhead, which is the other one of the two partitions; a displacement measuring unit installed in the space between the bulkheads on both sides of the inner bottom of the box-shaped girder to measure the amount of relative sagging of the box-shaped girder from the wire; and a tension adjusting part provided between the third partition wall and the first clamp disposed between the first partition wall and the second partition wall, and having one end of the wire coupled thereto to apply the tension of the wire within a set range. It provides a structure deflection measuring device comprising a.

The tension adjusting unit includes a first fastening part to which one end of the wire is coupled, a second fastening part connected to the third partition wall and elastically spaced apart from the first fastening part, and elastic restoring force within a set range. The branch may include a housing for connecting the first fastening part and the second fastening part through the elastic body.

The displacement measuring unit includes a plate connected to the wire, a displacement measuring part having one end coupled to a rear surface of the plate, fixed to the inner bottom surface of the girder and extending in the wire direction, and the other end of the displacement measuring part is coupled It may include a fixing part.

The displacement measuring unit may include a first magnetic body for attaching one end of the displacement measuring part to the rear surface of the plate, and a second magnetic body for attaching the fixing part to the inner bottom surface of the girder.

The displacement measuring unit may detect a displacement according to a distance that the other end of the displacement measuring unit moves from the plate and transmit it to the outside.

The first clamp and the second clamp may be fixed adjacently to the inner bottom surface of the box-shaped girder on the first and second bulkheads.

The second clamp may include a wire thimble provided to surround an inner circumferential surface of a portion to which the other end of the wire is fixed.

In addition, the present invention is a wire connecting the inner walls of both sides inside the PSC box-type girder; a first anchor to which one end of the wire is connected while being fixed to a first inner wall that is one of the inner walls of the both sides; a second anchor to which the other end of the wire is fixed while being fixed to a second inner wall that is the other one of the inner walls of both sides; a displacement measuring unit installed through a third anchor in the space between the inner walls of the both sides at the inner bottom of the box-shaped girder to measure the amount of relative sagging of the box-shaped girder from the wire; and a third anchor fixed to the bottom surface of the box-shaped girder adjacent to the first inner wall and the first anchor, and one end of the wire is coupled to adjust the tension that can apply the tension of the wire to a set range wealth; It provides a structure deflection measuring device comprising a.

According to the structure deflection measuring apparatus according to the present invention,

First, since the displacement measuring unit is installed inside the girder, it can be applied to bridges with high heights where it is difficult to install a floating point, and bridges that pass through rivers and seas.

Second, since the displacement measuring unit is connected to the bulkheads at both ends of the inside of the girder supported by point parts such as abutments and piers, there is no influence of wind, etc. Measurement error due to deflection can be significantly reduced,

Third, compared to the structure in which the piano strings are installed long to the ground, it is possible to overcome the environmental limitations of the space under the bridge (streams, vehicle traffic),

Fourth, in a situation where the girder sags, the tension control unit can apply the tension of one end of the wire to the set range, so it can be installed within the range of the wire used, so wire breakage can be prevented,

Fifth, by providing the wire thimble, it is possible to prevent the wire connection part from being damaged by friction in the process of adjusting the tension of the wire,

Sixth, by connecting the plate and the wire of the displacement measuring unit through a magnetic material, there is an effect that can be integrated by eliminating the separation of the connection part.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

The summary set forth above as well as the detailed description of the preferred embodiments of the present application set forth below may be better understood when read in conjunction with the accompanying drawings. For the purpose of illustrating the invention, there are shown in the drawings preferred embodiments. It should be understood, however, that the present application is not limited to the precise arrangements and instrumentalities shown.
1 is a reference view showing from the front that the structure deflection measuring device according to an embodiment of the present invention is installed on the bridge.
Figure 2 is a perspective view showing that the structure deflection measuring device is installed inside the steel box-type girder according to the first embodiment of the present invention.
FIG. 3 is a perspective view illustrating a state in which the first clamp is coupled in the region A shown in FIG. 2 .
4 is a perspective view showing a state in which the second clamp is installed in the area B shown in FIG. 2 .
FIG. 5A is a perspective view illustrating a state in which a displacement measuring unit is installed in area C shown in FIG. 2 .
Fig. 5B is a partially enlarged front view of the displacement measuring unit shown in Fig. 5A;
6 is a perspective view illustrating a state in which the tension adjusting unit is installed in the region D shown in FIG. 2 .
7 is a perspective view showing that the structure deflection measuring device is installed inside the PSC box-type girder according to the second embodiment of the present invention.
8 is a perspective view illustrating a state in which the first clamp is coupled in the area A shown in FIG. 7 .
9 is a perspective view illustrating a state in which the second clamp is installed in the region B shown in FIG. 7 .
10 is a perspective view showing a state in which the displacement measuring unit is installed in the region C shown in FIG.
11 is a perspective view illustrating a state in which a tension adjusting unit is installed in a region D shown in FIG. 7 .
12 is a graph comparing and measuring the amount of deflection of the girder using the apparatus for measuring the amount of structure deflection according to an embodiment of the present invention and the conventional measurement apparatus (piano string, scaffolding).

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated and described in the drawings.

However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Terms including an ordinal number such as first, second, etc. may be used to describe various elements, but the elements are not limited by the terms.

The above terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component.

and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be

On the other hand, when it is mentioned that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, the embodiment will be described in detail with reference to the accompanying drawings, but regardless of the reference numerals, the same or corresponding components are given the same reference numerals, and the overlapping description thereof will be omitted.

The structure deflection measuring apparatus according to an embodiment of the present invention is installed inside the box-type girder mounted on the top of the first column and the second column. A structure using such a column and a girder is commonly applied to a typical building structure. Hereinafter, it will be described as an example applied to a bridge.

1 is a reference view showing from the front that the structure deflection measuring device according to an embodiment of the present invention is installed on the bridge.

Referring to FIG. 1 , a first point and a second point may correspond to an abutment or a pier.

The first point (C1) and the second point (C2) are installed at a set interval, and a box-type girder (1) (hereinafter referred to as a girder) at each upper end of the first point (C1) and the second point (C2) is installed

Deflection occurs in the girder 1 depending on the load state, and at this time, the amount of deflection of the girder can be measured through the structure deflection measurement apparatus 100 .

Figure 2 is a perspective view showing that the structure deflection measuring device 100 is installed inside the steel box-type girder 10 according to the first embodiment of the present invention.

Referring to Figure 2, it can be seen that the structure deflection measuring apparatus 100 according to the first embodiment of the present invention is installed inside the steel box girder (Steel Box Girder, 10). The steel box-type girder 10 is provided with a plurality of partition walls 11, 12, 13 (or inner walls) therein, and at least some of the partition walls provide a hollow structure in which an inner part is opened. Of course, these bulkheads may be disposed in the horizontal and vertical directions with respect to the longitudinal direction of the girder 10, and may be accompanied by a reinforcing function.

The girder 10 is provided with a first bulkhead 11 at one end, a second bulkhead 12 at the other end, and a third bulkhead between the first bulkhead 11 and the second bulkhead 12 ( 13) will be described as an example of the provided structure. Of course, in addition to the first partition wall 11 to the third partition wall 13, more partition walls may be provided. In this case, the first partition wall 11 may be disposed on or adjacent to the first point C1 , and the second partition wall 12 may be disposed on or adjacent to the second point C2 .

The first partition walls 11 to 13 are arranged in a horizontal direction with respect to the longitudinal direction of the girder 10, and openings are formed therein, respectively. The third partition wall 13 may be disposed closer to the first partition wall 11 than the second partition wall 12 .

The structure deflection measuring apparatus 100 according to the first embodiment of the present invention includes a wire 110, a first clamp 120, a second clamp 130, a displacement measuring unit 140, and a tension adjusting unit ( 150).

FIG. 3 is a perspective view illustrating a state in which the first clamp is coupled in the region A shown in FIG. 2 .

Referring to FIG. 3 , the first clamp 120 is fixed on the first partition wall 11 . In addition, the first clamp 120 may be fixed to the flange region of the first partition wall 11 . In addition, the first clamp 120 is preferably fixed adjacent to the bottom surface of the girder 10 in the first bulkhead 11 or the flange region of the first bulkhead 11 .

The first clamp 120 includes a body 121 with both ends facing each other, and a pressing shaft 122 that reciprocates by rotation from one of both ends of the body 121 to the other. A screw clamp may be applied.

Accordingly, when the pressure shaft 122 is rotated on the body around the first partition wall 11 , the end of the pressure shaft 122 presses the first partition wall 11 and the first clamp 120 is fixed. At this time, a binner 123 to which one side of the wire 110 is connected is coupled to the pressing shaft 122 .

One side of the wire 110 coupled to the biner 123 may slip on the biner 123 by the operation of the tension adjusting unit 150 , which will be described later. Alternatively, it may include a structure for reducing friction between the wire 110 and the binner 123 by further providing a roller or a fixed pulley (not shown) on the binner 123 .

4 is a perspective view showing a state in which the second clamp is installed in the area B shown in FIG. 2 .

Referring to FIG. 4 , the second clamp 130 is fixed on the second partition wall 12 . In addition, the second clamp 130 may be fixed to the flange region of the second partition wall 12 . In addition, the second clamp 130 is preferably fixed adjacent to the bottom surface of the girder (see FIG. 2, 10) in the flange region of the second bulkhead 12 or the second bulkhead 12.

The second clamp 130 includes a body 131 with both ends facing each other, and a pressing shaft 132 that reciprocates by rotation from one of both ends of the body 131 to the other direction. A screw clamp may be applied. This may be applied in the same structure as the first clamp 120 described above.

Accordingly, when the pressure shaft 132 is rotated on the body 131 around the second partition wall 12, the end of the pressure shaft 132 presses the second partition wall 12 while fixing the second clamp 130. is done At this time, the other end of the wire 110 is fixed on the pressing shaft 132 . A wire thimble 133 may be provided at a portion in contact with the pressing shaft 132 of the second clamp 130 at the other end of the wire 110 . Of course, like the structure in which the wire 110 is coupled to the first clamp 120, it may be fixed by a binner. The wire thimble 133 may be formed to surround the pressing shaft 132 and may have a curved surface to partially surround the outer peripheral surface of the other end of the wire 110 . When the other end of the wire 110 is coupled by the wire thimble 133 on the pressing shaft 132 in this way, while the other end of the wire 110 comes into contact with the pressing shaft 132, at least one of the two is damaged. In addition, it is possible to prevent deformation while bending the wire 110 to a minimum radius of curvature corresponding to the diameter of the pressing shaft 132 .

While the other end of the wire 110 is connected to the wire thimble 133 , an area OA partially overlapping each other is formed. is done A plurality of wire clips may be coupled to the overlapping area OA.

5A is a perspective view illustrating a state in which the displacement measuring unit is installed in the region C shown in FIG. 2 , and FIG. 5B is a partially enlarged front view of the displacement measuring unit shown in FIG. 5A .

5A and 5B , the displacement measuring unit 140 includes a plate 141 , a displacement measuring unit 142 , and a fixing unit 143 .

The plate 141 is coupled on the wire 110 , and the plate 141 is fixed by a clip 145 from the wire 110 . In other words, the plate 141 maintains a fixed position on the wire 110 .

In addition, the plate 141 may be made of a metal material that responds to magnetism.

The displacement measuring unit 142 may be formed of a Linear Variable Differential Transformer (LVDT). One end of the displacement measuring unit 142 is coupled to the rear surface of the plate 141 , and the other end is positioned on the bottom surface 10a of the inside of the girder through the fixing unit 143 . For example, one end of the displacement measuring unit 142 may be attached through the first magnetic body 144 provided on the rear surface of the plate 141 .

The displacement measuring unit 142 is disposed on one side and has a magnetic core 142b on a rod 142a disposed on the back surface of the plate 141 through the first magnetic body 144 and is disposed on the other side. It is installed on the fixing part 143 and disposed to surround the core 142b and includes a measurement part 142c provided with a primary coil (coil1) and a secondary coil (coil2).

The measurement unit 142c generates a magnetic field while the primary coil coil1 is located in the center thereof and AC power is applied therein. At this time, the core 142b is disposed inside the measurement unit 142c to correspond to the position (or height) of the primary coil coil1 . In addition, the secondary coil coil2-1 is disposed in the vertical direction of the primary coil coil1 in the measurement unit 142c. Here, when the core 142b moves from the position of the primary coil (coil1) to the secondary coil (coil2-1) in the upper direction, the current generated in the secondary coil (coil2-1) in the upper direction is 2 in the lower direction. It flows in the direction of the secondary coil (coil2-2). Accordingly, the magnetic field generated in the primary coil coil1 changes according to the movement of the core 142b, which can be measured from the secondary coil.

Therefore, the rod 142a or the core 142b can maintain a fixed position from the wire 110 connected through the magnetic body 144 and the plate 141, and the girder (refer to FIG. 2, 10) is relatively It is possible to precisely measure the displacement (height difference) generated by the falling of the fixing part 143 and the measuring part 142c while sagging. Since there is no direct contact between the core 142b and the measurement portion 142c, and thus there is no friction, the displacement between the core 142b and the measurement portion 142c alone can be recognized as the amount of deflection of the girder.

The fixing part 143 includes a metal mounting plate 143a installed on the inner bottom surface 10a of the girder, and a mount frame 143b extending on the mounting plate 143a to support the measurement unit 142c. For example, the position of the measurement unit 142c may be set by aligning the position of the first coil coil1 on the mount frame 143b to correspond to the position of the rod 142a and the core 142b fixed to the plate 141 .

And between the mounting plate (143a) and the inner bottom surface (10a) of the girder can be attached and fixed through the second magnetic body (143c).

The displacement measuring unit 140 may detect a displacement according to the distance that the measuring unit 142c moves around the core 142b and transmit it to the outside (eg, an administrator's portable terminal or a PC or server capable of data storage).

6 is a perspective view illustrating a state in which the tension adjusting unit is installed in the region D shown in FIG. 2 .

Referring to FIG. 6 , the tension control unit 150 is disposed between the first clamp (see FIG. 2 , 120 ) and the third partition wall 13 to apply tension to one end of the wire 110 within a set range. provides

The tension adjusting unit 150 includes a first fastening part 151 , a second fastening part 152 , and a housing 153 .

One end of the wire 110 is connected to a biner (see FIG. 3 , 123 ) and then bent and coupled to the first fastening part 151 . A coupling may be made between one end of the wire 110 and the first fastening part 151 by a biner 154 . One end of the wire 110 coupled to the binner 154 may form an overlapping area OA with each other, and one end of the overlapping wire 110 may be fixed by a wire clip 134 .

The second fastening part 152 is connected to the third partition wall 13 through a connection wire 111 . The second fastening part 152 is fastened to the third partition wall 13 with a connecting wire 111 , and is disposed to allow adjustment of a distance from the third partition wall 13 to the second fastening part 152 . In this case, a hand power puller 155 or a hand winch may be provided between the third bulkhead 13 and the second fastening part 152 .

The housing 153 partially surrounds the first fastening part 151 and the second fastening part 152 and includes the first fastening part 151 and the second fastening part 152 through an elastic body (not shown) provided therein. ) is elastically connected. That is, the first fastening part 151 and the second fastening part 152 are connected so that elastic restoring force is continuously provided with respect to each other. Accordingly, the tension control unit 150 may apply the overall tension of the wire 110 to a set range.

In addition, the hand power puller 155 or the hand winch may provide various distance adjustment functions according to the distance between the second fastening part 152 and the third bulkhead 13 . That is, the distance between the tension control unit 150 and the third bulkhead 13 may vary depending on the size or type of the girder. This distance difference can be adjusted.

7 to 11 show that the structure deflection measuring device is installed inside the PSC box-type girder according to the second embodiment of the present invention. Hereinafter, the same reference numerals as the aforementioned reference numerals denote the same components.

In the second embodiment of the present invention, there is a difference in the coupling structure in which the structure deflection measuring device is installed in the aforementioned steel box-type girder 10 and the PSC box-type girder 20, and the functions and effective aspects of other major components are Since they are the same, duplicate descriptions will be omitted.

7 to 11 , the structure deflection measuring apparatus 200 according to the second embodiment of the present invention is installed inside a PSC box-type girder (Pre-stressed Concrete Box Girder, 20). Therefore, in the first embodiment described above, since the structure deflection measuring device is installed on the steel box-type girder, if the installation or attachment structure was possible using a clamp or a magnetic material, in this second embodiment, the structure is placed on the concrete girder 20 Since the deflection measuring device 200 is installed, an anchor bolt is mainly installed on the concrete surface, and the structure deflecting measuring device 200 is connected, installed, and fixed here.

In the region A of FIG. 7 , one end of the wire 110 is connected to a first anchor (see FIG. 8 , AB1 ) provided on the inner wall 21 of one end of the girder. In addition, the other end of the wire 110 in the region B is fixed to the second anchor (see FIG. 9, AB2) provided on the inner wall 22 of the other end of the girder. The first anchor (AB1) and the second anchor (AB2) are preferably installed at a height adjacent to the inner bottom surface (20a) of the girder on the inner wall, respectively.

The displacement measuring unit 140 is fixed to the third anchor (see FIG. 10, AB3) installed on the bottom surface 20a inside the girder in the region C of FIG. 7 . Since the functional parts of the displacement measuring unit 140 are the same as those of the first embodiment, redundant description is omitted.

And, in the region D of FIG. 7, the connection wire 111 or the hand power puller 155 or the hand winch of the tension control unit 150 is the bottom surface 20a inside the girder by the fourth anchor (see FIG. 11, AB4). is fixed on The tension control unit 150 and the connection structure between the tension control unit 150 and the fourth anchor AB4 provide the same structure as the first embodiment described above.

12 is a graph comparing and measuring the amount of deflection of the girder using the apparatus for measuring the amount of deflection of a structure according to an embodiment of the present invention and a conventional measurement apparatus (eg, piano string, scaffolding).

Figure 12a shows graphs (DT1, DT2) measured using a conventional measuring device in a static state (or under static conditions) and a graph (inside a box) measured using a structure deflection measuring device according to an embodiment of the present invention.

In the case of the conventional DT1, the structural stability is excellent and relatively precise measurement is possible, and the conventional DT2 has a larger error range compared to the DT1, but it is possible to measure a bridge with a high bridge or a bridge area such as the sea or a river.

In FIG. 12 , in the graphs of the present invention and the related art, the opposite directions are shown as opposite waveforms due to the difference according to the measurement directions, and the maximum deflection (mm) also appears oppositely as a (-) value and a (+) value. Therefore, it is preferable to determine the maximum amount of deflection as an absolute value rather than a comparison of a negative number and a positive number.

The maximum amount of deflection of the conventional measuring device DT1 represents 2.59mm and DT2 represents 3.17mm, whereas the amount of deflection of the structure deflection measuring device of the present invention is 2.32mm.

It is determined that the maximum amount of deflection close to the measurement value of DT1 is measured because the measurement error can be reduced because the structure deflection measurement apparatus of the present invention can measure it by minimizing the influence of external force compared to the conventional measurement apparatus. Here, an error that may be caused by an external force may be generated, for example, by wind in an area with a high bridge height, or may be generated by vibration due to a flow of water when the bridge area is a river or the sea.

Figure 12b shows graphs (DT1, DT2) measured using a conventional measuring device in a dynamic state (or under the same conditions) and a graph (inside the box) measured using a structure deflection measuring device according to an embodiment of the present invention.

Similarly in FIG. 12B , the direction and maximum deflection of the graph are determined as absolute values.

In Figure 12b, the maximum amount of deflection of the conventional measuring device DT1 represents 2.61mm, DT2 represents 3.30mm, while the amount of deflection of the structure deflection measuring device of the present invention is 2.39mm is recorded.

Therefore, the amount of deflection in the dynamic state is also determined to be able to be derived more closely to the measured value of DT1 by the result measured using the apparatus for measuring the amount of structure deflection of the present invention.

Therefore, according to the structure deflection measuring device according to the present invention, since the displacement measuring unit is installed inside the girder, the installation is simple compared to the structure in which the conventional piano string is installed long to the ground, and the displacement measuring unit is supported by the girder Because it is connected to the bulkheads at both ends, the measurement error due to the sag of the girder can be significantly reduced, and the tension control unit can keep the tension of one end of the wire constant in a situation where the girder is sagging, so precise measurement of the displacement measuring unit is possible. And, by providing the wire thimble, it is possible to prevent the wire connection part from being damaged by friction in the process of adjusting the tension of the wire, and the plate of the displacement measurement unit can fix the absolute position on the wire, so the installation structure of the displacement measurement unit It has the effect of overcoming the error caused by

In the above, specific embodiments have been shown and described to illustrate the technical idea of the present invention, but the present invention is not limited to the same configuration and operation as the specific embodiments as described above, and various modifications do not depart from the scope of the present invention. can be carried out within Accordingly, such modifications should be regarded as falling within the scope of the present invention, and the scope of the present invention should be determined by the following claims.

100: structure deflection measuring device
110: wire
120: first clamp
130: second clamp
140: displacement measuring unit
150: tension control unit

Claims (8)

a wire connecting the bulkheads on both sides inside the box-type girder;
a first clamp to which one end of the wire is connected while being fixed to the first bulkhead, which is one of the partitions on both sides;
a second clamp to which the other end of the wire is fixed while being fixed to the second bulkhead, which is the other one of the two partitions;
a displacement measuring unit installed in the space between the two bulkheads in the inner bottom surface of the box-shaped girder to measure the amount of relative sagging of the box-shaped girder from the wire; and
a tension adjusting part provided between the third partition wall and the first clamp disposed between the first partition wall and the second partition wall, and having one end of the wire coupled thereto to apply the tension of the wire within a set range; including,
The displacement measuring unit includes a plate connected to the wire, a displacement measuring part having one end coupled to a rear surface of the plate, fixed to the inner bottom surface of the girder and extending in the wire direction, and the other end of the displacement measuring part is coupled includes a fixing part;
The displacement measuring unit includes a rod fixed to the back surface of the plate through a first magnetic material attached to the back surface of the plate and provided with a core at one end, and a measurement unit provided with a plurality of coils disposed to surround the core do,
The structure deflection measuring device, characterized in that the core and the measuring unit is disposed so as not to contact each other. The method according to claim 1,
The tension control unit,
a first fastening part to which one end of the wire is coupled;
a second fastening part spaced apart from the first fastening part and resiliently arranged and connected to the third partition wall;
and a housing for connecting the first fastening part and the second fastening part through an elastic body having an elastic restoring force within a set range. delete The method according to claim 1,
The displacement measuring unit,
Structure deflection measuring device, characterized in that it comprises a second magnetic material for attaching the fixing portion to the inner bottom surface of the girder. The method according to claim 1,
The displacement measuring unit,
A structure deflection measuring device, characterized in that the other end of the displacement measuring unit senses a displacement according to the distance moved from the plate and transmits it to the outside. The method according to claim 1,
The first clamp and the second clamp,
Structure deflection measuring apparatus, characterized in that fixed adjacent to the inner bottom surface of the box-shaped girder on the first bulkhead and the second bulkhead. The method according to claim 1,
The second clamp is
and a wire thimble provided to surround a partial inner circumferential surface to which the other end of the wire is fixed. a wire connecting the inner walls of both sides inside the box girder;
a first anchor to which one end of the wire is connected while being fixed to a first inner wall that is one of the inner walls of the both sides;
a second anchor to which the other end of the wire is fixed while being fixed to a second inner wall that is the other one of the inner walls of both sides;
a displacement measuring unit installed through a third anchor in the center between the inner walls of both sides at the inner bottom of the box-shaped girder to measure the amount of drooping of the box-shaped girder from the wire; and
A tension adjusting unit that is provided between the first anchor and a fourth anchor fixed to the bottom surface of the box-shaped girder adjacent to the first inner wall, and one end of the wire is coupled to apply the tension of the wire to a set range ; including,
The displacement measuring unit includes a plate connected to the wire, a displacement measuring part having one end coupled to a rear surface of the plate, fixed to the inner bottom surface of the girder and extending in the wire direction, and the other end of the displacement measuring part is coupled includes a fixing part;
The displacement measuring unit includes a rod fixed to the rear surface of the plate through a first magnetic material attached to the rear surface of the plate and provided with a core at one end, and a measurement unit provided with a plurality of coils arranged to surround the core do,
The structure deflection measuring device, characterized in that the core and the measuring unit is disposed so as not to contact each other.

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