KR102406455B1 - Longitudinal Displacement Measurement Device for Bridge Upper Structure - Google Patents

Abstract

Disclosed is an apparatus for measuring displacement in the axial direction of a bridge superstructure. The device for measuring the displacement in the axial direction of the bridge superstructure according to the present invention is a device for monitoring and measuring whether or not displacement of the girder in the throttle direction (length direction of the bridge) with respect to the abutment occurs. It is installed on the lower surface of the girder and installed on the front A measurement scale is formed in a first direction parallel to the throttle axis direction and a plurality of mounting spaces divided in the first direction are formed therein; It is installed on the upper surface of the abutment so as to be opposite to, and a magnet mount having a magnetic mounting surface is provided at a height separated by a certain distance from the upper surface of the abutment, and it is mounted on the magnet mounting surface of the fixed measuring instrument and the magnet mount having a measuring needle formed therein, and with the displacement identification magnet It includes a stationary magnet for levitating the displacement identification magnet in a second direction perpendicular to the first direction by interaction, the displacement identification magnet and the stationary magnet are arranged so that the magnetic poles of the opposite surfaces are the same so that a mutual repulsive force acts, the girder When the movable measuring instrument is moved in the first direction according to the displacement in the throttle direction, at least one of the plurality of displacement identification magnets is levitated in the second direction in the mounting space by a repulsive force with the stationary magnet.

Description

Longitudinal Displacement Measurement Device for Bridge Upper Structure

The present invention relates to an apparatus for measuring displacement in the axial direction of a bridge superstructure, and in particular, an abutment It relates to a bridge superstructure displacement measuring device that measures and measures whether or not displacement occurs in the axial direction (the axial direction of the bridge) of the girder (bridge superstructure) with respect to the pier.

Bridges are structurally composed of bridge superstructures (slabs and girders) that are moved by vehicles or people, and abutments or piers supporting the bridge girders. In addition, a bearing is provided between the abutment or the pier and the bridge girder to support the fixed and moving loads of the bridge superstructure (slab and girder), It accommodates displacement in the throttle direction.

As mentioned above, the bridge undergoes expansion and contraction displacement according to the temperature change. In addition, many bridge structures undergo external deformation according to their durability and aging conditions, and earthquakes and typhoons aggravate the deformation of old facilities. Irregular and minute gradual deformation of the outer shape of the bridge impairs the performance of the bridge and the safety of the bridge structure, so continuous management and inspection is required.

One of the bridge management inspection elements is the measurement of the expansion and contraction displacement according to the temperature change of the girder, which is the upper structure of the bridge. For this measurement of the expansion and contraction displacement of the girder, conventionally, the manager directly approaches the top of the abutment and measures it with a tape measure. This method has the advantage of low cost, but has the disadvantage that the measurement value may vary depending on the measurement direction or the skill level of the operator, and there may be restrictions on the operation depending on the location of the bridge or surrounding conditions.

Accordingly, a technology for safely and accurately measuring the displacement in the axial direction of the girder has been proposed through Korean Patent Registration No. 10-1522193 under the name of 'a device for measuring the displacement of the superstructure of a bridge'. It is installed across the girder and the abutment and pier supporting it, and is composed of two or more displacement measuring units having a measuring scale, a frame for adjusting the width, a frame for installing a displacement meter, and a hanger.

The conventional bridge superstructure displacement measuring device of this configuration is a method of measuring by installing a displacement measurer at each measuring point along the vertical frame for installing the displacement meter, so it is possible to simultaneously measure the displacement of the elastic bearing and the girder as well as the displacement of the slab. However, it has the disadvantage that it requires a lot of time and manpower to apply it to the field as much as the configuration is complicated and complicated.

Korean Patent No. 10-1522193 (registration date: May 15, 2015)_ Displacement measuring device for the upper structure of a bridge

The technical problem to be solved by the present invention is that it is possible to check whether or not displacement of the girder in the axial direction (axial or longitudinal direction of the bridge) with respect to the abutment occurs from a relatively long distance without an on-site approach, thus providing convenience of bridge displacement measurement work and An object of the present invention is to provide an apparatus for measuring displacement in the axial direction of the bridge superstructure that can promote the safety of workers.

Another technical problem to be solved by the present invention is to measure displacement in the axial direction of the bridge superstructure that can be easily applied to existing bridge structures without special structural changes as a simple configuration, and is advantageous in terms of cost as well as economic feasibility as it is a simple configuration It is intended to provide a device.

According to an embodiment of the present invention as a means of solving the problem,

As a device for monitoring and measuring whether displacement occurs in the direction of the bridge axis (length direction of the bridge) of the girder with respect to the abutment,

a movable measuring instrument installed on the lower surface of the girder, having a measurement scale formed on the front surface in a first direction parallel to the throttle direction, and having a plurality of mounting spaces divided in the first direction;

a plurality of displacement identification magnets mounted one by one in the mounting space of the movable measuring instrument;

a fixed measuring instrument installed on the upper surface of the abutment to face the movable measuring instrument and having a magnet mount having a magnetic mounting surface at a height separated by a predetermined distance from the upper surface of the alternator; and

A stationary magnet mounted on the magnet mounting surface of the magnet mount and levitating the displacement identification magnet in a second direction perpendicular to the first direction; includes,

The displacement identification magnet and the stationary magnet have the same magnetic poles on opposite surfaces so that mutual repulsive force acts, and at least one of a plurality of displacement identification magnets when the movable measuring instrument is moved in the first direction according to the displacement in the throttle direction of the girder. Displacement measuring device in the axial direction of the bridge superstructure, characterized in that the floating in the second direction in the mounting space by the repulsive force with the stationary magnet.

The displacement identification magnet and the fixed magnet have the same magnetic poles on the opposite sides so that mutual repulsive force acts,

In accordance with the displacement of the girder in the throttle direction, at least one of the plurality of displacement identification magnets is levitated in the second direction in the corresponding mounting space by a repulsive force with the stationary magnet. to provide.

Here, in the plurality of displacement identification magnets, the strength of the displacement identification magnet mounted in the central mounting space of the movable measuring instrument among the plurality of mounting spaces is the weakest, and the displacement identification magnet mounted in the outermost mounting space located farthest from the central mounting space. may be the strongest.

In addition, the color of the displacement identification magnet mounted in the left and right mounting spaces based on the central mounting space of the movable measuring instrument among the plurality of mounting spaces may be different from each other. For example, the displacement identification magnet mounted in each of the mounting spaces located on the left with respect to the central mounting space may be colored in blue, and the displacement identification magnet mounted in each of the mounting spaces located in the right may be colored in red.

In this case, the operator can easily identify whether the displacement in the throttle direction generated in the girder is the extension displacement or the contraction displacement, only by the color of the magnets levitated without close proximity.

The apparatus for measuring displacement in the axial direction of the bridge superstructure according to an embodiment of the present invention is also

When the outermost displacement identification magnet mounted in the outermost mounting space among the plurality of mounting spaces is levitated in the second direction by the repulsive force with the stationary magnet, the switch is turned on by the levitated outermost displacement identification magnet (Turn on) ) and a warning means for informing the outside that the displacement state of the throttle direction of the girder is in a dangerous state; may further include.

Here, the warning means is a light source module including a light source that is turned on when the switch is turned on by the displacement identification magnet, or when the switch is turned on by the displacement identification magnet, the internal control circuit generates a danger signal, and the generated danger signal It may be a communication module mounted with a communication antenna that is converted into a wirelessly transmittable form and then transmitted wirelessly to an external bridge monitoring system.

According to the apparatus for measuring the displacement in the throttle direction of the bridge superstructure according to the embodiment of the present invention, the administrator can visually determine whether or not the displacement in the throttle direction of the girder with respect to the abutment according to the temperature change and the direction in which the displacement occurred, from a relatively long distance without approaching the site (if In some cases, it can be checked with a telescope), and the exact amount of displacement can be grasped by checking the measurement scale.

Moreover, since it is possible to check whether the displacement of the girder in the direction of the axis of the girder for the abutment due to temperature changes and the degree of displacement can be checked from a relatively long distance without approaching the site, the bridge is not affected by environmental factors such as the location of the bridge, surrounding conditions, and weather. It is possible to carry out a safety diagnosis operation, thus providing the convenience of bridge displacement measurement operation and promoting the safety of the operator.

In addition, because of its simple configuration, it can be easily applied to an existing bridge structure without special installation know-how or any structural or design changes to the existing bridge structure.

1 is an exploded perspective view of an apparatus for measuring displacement in the axial direction of a bridge superstructure according to an embodiment of the present invention;
Figure 2 is a combined perspective view of the bridge superstructure bridge axis direction displacement measuring device shown in Figure 1;
3 is a view of the bridge superstructure bridge axis displacement measuring device shown in FIG. 2 as viewed from the front;
4 is a view illustrating a state in which the present invention is installed on a bridge.
5 is an enlarged perspective view of the main part of the present invention for showing the arrangement relationship between the magnetic mount of the fixed measuring instrument and the movable measuring instrument.
FIG. 6 is a view of FIG. 5 as viewed from the front;
7 is a plan view configuration diagram for showing the arrangement state of the displacement identification magnet in the mounting space of the movable measuring instrument in FIG. 5 .
8 is an operation state diagram of an apparatus for measuring displacement in the axial direction of a bridge upper structure according to an embodiment of the present invention.
9 is an enlarged front view of the main part showing another preferred embodiment of the apparatus for measuring displacement in the axial direction of the bridge superstructure according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the present invention, the terms used in the following specification 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 addition, in this specification, terms such as "comprise" or "have" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, and one or more other It should be understood that this does not preclude the possibility of addition or presence of features or numbers, steps, operations, components, parts, or combinations thereof.

Also, terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

In addition, terms such as “…unit”, “…unit”, “…module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. can

In the description with reference to the accompanying drawings, the same reference numerals will be assigned to the same components for the same components, and overlapping descriptions thereof will be omitted. And, in the description of the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a perspective view of an apparatus for measuring displacement in the axial direction of a bridge superstructure according to an embodiment of the present invention, and FIG. 2 is a view of the apparatus for measuring displacement in the axial direction of a bridge superstructure shown in FIG. 1 as viewed from the front. And Figure 3 is a view illustrating a state that the present invention is installed on a bridge.

1 to 3, the bridge superstructure displacement measuring apparatus 1 according to an embodiment of the present invention generates displacement in the bridge axis direction (length direction of the bridge) of the girder 3 with respect to the abutment 2 As a device for monitoring and measuring whether or not, the movable measuring instrument 10 installed on the lower surface of the girder 3 and the fixed measuring instrument 14 installed on the upper surface of the abutment 2 to face the movable measuring instrument 10 can be configured.

The movable measuring instrument 10 may be configured in a rectangular parallelepiped shape with a transverse length long compared to the height, and the measuring scales 102 formed at equal intervals along the first direction parallel to the throttle axis direction are provided at the lower front end thereof. And the inside is disposed on the inner partition wall 104 at regular intervals along the first direction, and a plurality of mounting spaces 106 are partitioned in the first direction by the inner partition wall 104 .

The front part of the movable measuring instrument 10 is opened so that the mounting space 106 divided into a plurality of the inside is exposed to the outside, and the mounting space 106 of the movable measuring instrument 10 divided in a plurality in the first direction. Each displacement identification magnet 11 is mounted one by one. In this case, the displacement identification magnet 11 may be a permanent magnet having a rectangular shape in plan view, and may be placed on the bottom of the movable measuring instrument 10 of each mounting space 106 .

As mentioned above, the fixed measuring instrument 14 may be installed on the upper surface of the abutment 2 to face the movable measuring instrument 10 . The fixed measuring instrument 14 is a magnet mount 141 attached to the top of the rod 140 so as to be located at a height separated by a predetermined distance from the upper surface of the rod 140 having a circular or polygonal cross section and the abutment 2, And it may include a measuring needle 142 attached to the magnet mount (141).

When viewed from the front (in the direction of FIG. 3), the fixed measuring instrument 14 is positioned such that the measuring needle 142 overlaps at least partially with the measuring scale 102 of the movable measuring instrument 10 installed on the lower surface of the girder 3 It may be installed on the upper surface of the abutment (2). The fixed measurer 14 may be fixed on the abutment 2 by, for example, connecting one end of the rod 140 (the lower end in the drawing) to the abutment using an anchor bolt or an interference fit method, but is not limited thereto.

A magnet mounting surface 141a is formed on the upper surface of the magnet mount 141 , and the stationary magnet 15 may be mounted on the magnet mounting surface 141a. The stationary magnet 15 mounted on the magnet mounting surface 141a is a position corresponding to when displacement occurs in the girder 3 in the throttle direction (the axial direction of the bridge) through interaction with the displacement identification magnet 11. The displacement identification magnet 11 is levitated in a second direction perpendicular to the first direction.

To this end, the displacement identification magnet 11 mounted one by one in the mounting space 106 of the movable measuring instrument 10 and one stationary magnet 15 mounted on the magnet mount 141 of the fixed measuring instrument 14 are mutually The moving poles may be disposed to face each other with the bottom panel of the movable measuring instrument 10 interposed therebetween so as to act as a repulsive force. That is, they may be mounted on each of the mounting space 106 and the magnet mounting surface 141a so that the same polarities face each other.

Here, the stationary magnet 15 may be a permanent magnet having the same or slightly smaller flat shape as one of the displacement identification magnets 11, and the magnet mounting surface 141a in various ways, including the attachment method using an adhesive. ) can be firmly attached and fixed.

As the movable measurer 10 is attached to the girder 3 where displacement occurs and the fixed measurer 14 is attached to the abutment 2, which is a relatively fixed body, when displacement in the throttle direction occurs in the girder 3, the movable measurer 10 ) makes a relative motion in the first direction by the amount of displacement generated in the girder 3 with respect to the fixed measuring instrument 14, and in this process, the displacement identification magnet 11 close to the fixed magnet 15 is repulsive in the second direction is supported by

According to this configuration, when displacement occurs in the girder 3 in the throttle direction due to temperature change, etc., before checking whether displacement occurs and the exact amount of displacement through the measurement scale 102 at a close distance, the displacement identification magnet 11 ), it is possible to quickly and easily identify with the naked eye whether a displacement has occurred in the girder 3 and whether the generated displacement is an extension displacement or a contraction displacement from a distance.

4 is an enlarged perspective view of the main part of the present invention for showing the arrangement relationship between the magnet mount of the fixed measuring instrument and the movable measuring instrument, and Fig. 5 is a view seen from the front of Fig. 4 . And FIG. 6 is a plan view configuration diagram for showing the arrangement state of the displacement identification magnet in the mounting space of the movable measuring instrument in FIG. 4 .

4 and 6 , the movable measuring instrument 10 may be disposed at a predetermined distance upward in the second direction from the stationary magnet 15 mounted on the upper surface of the magnet mount 141 . Preferably, the fixed measurer 14 is arranged so that the bottom panel (symbol omitted) of the movable measurer 10 faces the upper surface of the magnet mount 141 on which the fixed magnet 15 is mounted at a predetermined distance (D). ), the movable measuring instrument 10 may be disposed on the upper part.

Here, the displacement identification magnet 11 mounted one by one in the mounting space 106 of the movable measurer 10 and one fixed magnet 15 mounted on the magnet mount 141 of the fixed measuring instrument 14 are mutually As mentioned above, the same poles (same poles) may be aligned or arranged to face each other with the bottom panel of the movable measuring instrument 10 interposed therebetween so as to act as a repulsive force.

For example, if the surface (upper surface in the drawing) of the stationary magnet 15 facing the movable measuring instrument 10 is an N pole, as in the example of the drawing, the surface of the displacement identification magnet 11 facing the stationary magnet 15 (drawing) top and bottom) may also be formed as an N pole. Conversely, if the surface (upper surface in the drawing) of the stationary magnet 15 facing the movable measurement field is an S pole, the surface (lower surface in the drawing) of the displacement identification magnet 11 facing the stationary magnet 15 (lower surface in the drawing) will also be arranged so that the S pole is located. can

As the stationary magnet 15 and the displacement identification magnet 11 are arranged to face the same magnetic poles, a repulsive force acts between these magnets. Therefore, at least one of the displacement identification magnets 11 of each of the mounting space 106 of the movable measuring instrument 10 is levitated in the second direction in the corresponding mounting space 106 .

When the displacement identification magnets 11 are mounted one by one in each of the mounting spaces 106 partitioned into a plurality, the magnets are placed in the central mounting space 106a of the center of the movable measuring instrument 10 among the mounting spaces 106 partitioned into the plurality. The displacement identification magnet 11 with the weakest strength (magnetic force) is mounted, and the displacement identification magnet 11 with the strongest magnet strength is mounted in the outermost mounting space 106f located farthest from the central mounting space 106a. can be

Preferably, the displacement identification magnet 11 having a stronger strength as it goes from the central mounting space 106a to the outermost mounting space 106f may be mounted. That is, as the distance from the central mounting space 106a increases, the corresponding mounting space 106 has a stronger displacement identification magnet than the displacement identification magnet 11 of the mounting space 106 located relatively close to the central mounting space 106a ( 11) can be mounted.

According to this configuration, the throttle axis displacement occurs in the girder 3 at the initial setting position where the measuring needle 142 points to '0' of the measuring scale 102, and the movable measuring instrument 10 is moved together with the girder 3 When moving in the second direction, the greater the displacement of the girder 3, the stronger the displacement identification magnet 11 faces the stationary magnet 15, so when the displacement is relatively small, the displacement that the stationary magnet 15 faces It can be lifted higher than the identifier seat 11 .

According to this, before checking whether displacement occurred in the throttle axis in the girder 3 due to temperature change, etc., and when the displacement occurs, check the measurement scale 102 at a close distance to check the exact displacement amount of the displacement identification magnet 11 Just by looking at the buoyancy state, the current level of displacement, for example, displacement within an allowable range or displacement at a dangerous level, can be easily identified with the naked eye from a relatively distant distance.

In some cases, the mounting space 106 is divided into a left mounting space group and a right mounting space group based on the central mounting space 106a of the movable measuring instrument 10 among the plurality of mounting spaces 106, and the left mounting space By making the color of the displacement identification magnet 11 mounted in the group and the right mounting space group different from each other, it is possible to quickly identify whether the displacement occurring in the girder is a stretching displacement or a contraction displacement only by identifying the color of the levitated displacement identification magnet 11 .

For example, the displacement identification magnet 11 mounted in the mounting spaces 106 located on the left with respect to the central mounting space 106a is designated as blue, and the displacement mounted in the mounting spaces 106 located on the right side of the central mounting space 106a. The identifier seat 11 can be designated in red.

In this case, when displacement occurs in the girder 3 and the movable measuring instrument 10 is moved together with the girder 3, the color of the displacement identification magnet 11 levitated by the repulsive force with the stationary magnet 15 is blue. In this case, the operator can know that the current elongational displacement has occurred in the girder. That is, it is possible to quickly and easily determine whether the displacement in the throttle direction generated in the girder is an extension displacement or a contraction displacement simply by looking at the color of the currently levitated displacement identification magnet.

The installation of the displacement measuring device for the bridge superstructure according to the embodiment of the present invention configured as described above and measuring the displacement of the bridge superstructure, that is, the girder using the installed measuring device, will be briefly described.

Referring back to FIG. 3 , a movable measuring instrument 10 is installed on the lower surface of the girder 3 , and a fixed measuring instrument 14 is installed on the upper surface of the abutment 2 at a position corresponding to the movable measuring instrument 10 . At this time, by setting the position on the shift (2) where the measuring needle 142 of the fixed measuring instrument 14 can point to the measuring scale 102 indicated by the number '0' among the measuring scales 102 displayed on the movable measuring instrument 10, Installation is simply completed by installing the fixed measuring instrument 14 at the position.

In the embodiment of the present invention installed in this way, the movable measuring instrument 10 is installed in the girder 3 that contracts or expands in a predetermined range according to the temperature change, so that when the axial displacement occurs in the girder 3, the fixed measuring instrument ( 14) By reading the measurement scale 102 of the movable measuring instrument 10 pointed to by the measuring needle 142 of 14), the type of displacement (extension/contraction displacement) generated in the girder 3 and how much displacement occurred .

In particular, in the present invention, a plurality of displacement identification magnets 11 are mounted to be buoyant in the second direction on the movable measuring device 10, and the displacement identification magnet 11 and the same pole are fixed to the fixed measuring device 14 in a structure facing each other. Since the magnet 15 is mounted, it is possible to determine whether or not displacement occurs and the type of displacement by looking at only the displacement identification magnet 11 that can be confirmed from a distance before the accurate displacement amount of the girder 3 is identified through the measurement scale.

Moreover, when the displacement identification magnet 11, which has a stronger magnet strength, is mounted, the greater the displacement width of the girder 3, the stronger the displacement identification magnet 11. By facing the stationary magnet 15 and buoyed to a higher height compared to the case where the displacement width is relatively small, it is also possible to know approximately how much displacement occurred before checking the exact displacement amount through checking the measurement scale.

For example, as shown in FIG. 7 , if the shrinkage displacement generated in the girder 3 is small, the displacement identification magnet 11 facing the stationary magnet 15 in the corresponding displacement state is a relatively weak magnet, so it is levitated relatively low. and (refer to (a) of FIG. 7), if the shrinkage displacement generated in the girder 3 is large, the displacement identification magnet 11 facing the fixed magnet 15 by that much is a relatively strong magnet, so it is relatively high levitated. (refer to FIG. 7(b)).

Therefore, before checking the exact scale (measurement scale indicated by the measuring needle) to determine the type of displacement and the exact amount of displacement, whether or not displacement has occurred in the girder from the floating state of the displacement identification magnet 11 and the current displacement is a safety problem. It is possible to first determine whether the displacement occurred within the allowable range, or whether the displacement is outside the allowable range and at a level that can cause a hazard with the naked eye even from a relatively distant distance.

The conventional conventional measurement method, in which an administrator directly approaches the top of the shift and measures it with a tape measure, has the advantage of being able to measure quickly and at a low cost. However, there is a disadvantage in that the bridge displacement management cannot be systematically and efficiently due to the lack of measurement precision, and in addition, it is dangerous and convenient because the manager has to directly access the top of the abutment.

On the other hand, according to the apparatus for measuring the displacement in the throttle direction of the bridge superstructure according to the embodiment of the present invention, the administrator visually ( In some cases, it can be checked with a telescope), and the exact amount of displacement can be grasped by checking the measurement scale.

In addition, since it is possible to check whether or not the displacement of the girder in the direction of the axis of the girder for the abutment due to temperature changes and the degree of displacement occur from a relatively long distance without approaching the site, it is not affected by environmental factors such as the location of the bridge, surrounding conditions, and weather. Bridge safety diagnosis work can be carried out, so it is possible to provide convenience of bridge displacement measurement work and promote worker safety.

In addition, because of its simple configuration, it can be easily applied to existing bridge structures without special installation know-how or any structural or design changes to the existing bridge structures.

Meanwhile, FIG. 8 is an enlarged front view of the main part showing another preferred embodiment of the apparatus for measuring displacement in the direction of the bridge superstructure according to the present invention.

As shown in Figure 8, another preferred embodiment of the present invention, the outermost displacement identification magnet (11f) mounted in the outermost mounting space (106f) of the movable measuring instrument in the second direction by the repulsive force with the stationary magnet (15) When it is lifted, the switch is turned on by the outermost displacement identification magnet 11f to be lifted, and a warning means 19 to inform the outside that the displacement state of the throttle direction of the girder 3 is a dangerous state may be further included. have.

Here, the warning means 19 is, for example, a light source module 19a having a light source 192 that is turned on when the switch 190 is turned on by the outermost displacement identification magnet 11f, or an outermost displacement identification magnet When the switch 190 is turned on by (11f), the internal control circuit generates a danger signal, converts the danger signal into a form that can be transmitted wirelessly, and wirelessly transmits the danger signal to an external bridge monitoring system. It may be a module 19b.

In this other embodiment, when a large displacement of a dangerous level occurs in the girder 3 to such a degree that the outermost displacement identification magnet 11 is lifted, the warning means 19 by the outermost displacement identification magnet 11 to be lifted ) of the switch 190 is turned on and the warning means 19 is immediately operated accordingly, so that the manager can quickly recognize that a displacement of more than the allowable safe range has occurred in the girder 3 and take a quick response.

In the above detailed description of the present invention, only specific embodiments thereof have been described. However, it is to be understood that the present invention is not limited to the particular form recited in the detailed description, but rather, it is to be understood to cover all modifications and equivalents and substitutions falling within the spirit and scope of the present invention as defined by the appended claims. should be

1: Displacement measuring device 2: Alternating
3: girder 10: movable measuring instrument
11: displacement identification magnet 14: fixed measuring instrument
15: fixed magnet 19: warning means
19a: light source module 19b: communication module
102: measurement scale 104: bulkhead
106: mounting space 140: rod part
141: magnet mount 141a: magnet mounting surface
142: measuring needle 190: switch
192: light source

Claims (6)

As a device for monitoring and measuring whether displacement occurs in the direction of the bridge axis (length direction of the bridge) of the girder with respect to the abutment,
a movable measuring instrument installed on the lower surface of the girder, having a measurement scale formed on the front surface in a first direction parallel to the throttle direction, and having a plurality of mounting spaces partitioned therein;
a plurality of displacement identification magnets mounted one by one in the mounting space of the movable measuring instrument;
a fixed measurer installed on the upper surface of the abutment to face the movable meter, provided with a magnet mount having a magnetic mounting surface at a height separated from the upper surface of the abutment by a certain distance, and having a measuring needle; and
A stationary magnet mounted on the magnet mounting surface of the magnet mount and levitating the displacement identification magnet in a second direction perpendicular to the first direction; includes,
The displacement identification magnet and the stationary magnet have the same magnetic poles on opposite surfaces so that a mutual repulsive force acts, and at least one of the plurality of displacement identification magnets when the movable measuring instrument is moved in the first direction according to the displacement in the throttle direction of the girder. Displacement measuring device in the axial direction of the bridge superstructure, characterized in that it is lifted in the second direction in the mounting space by the repulsive force with the stationary magnet.
The method of claim 1,
In the plurality of displacement identification magnets, the strength of the displacement identification magnet mounted in the central mounting space of the movable measuring instrument among the plurality of mounting spaces is the weakest,
Displacement measuring device in the throttle direction of the bridge superstructure, characterized in that the strength of the displacement identification magnet mounted in the outermost mounting space located farthest from the central mounting space is the strongest.
3. The method of claim 1 or 2,
Displacement measuring device in the axial direction of the bridge superstructure, characterized in that the color of the displacement identification magnet mounted in the mounting spaces located on the left and the mounting spaces located on the right side of the central mounting space of the movable measuring instrument among the multiple mounting spaces is different from each other .
The method of claim 1,
When the outermost displacement identification magnet mounted in the outermost mounting space among a plurality of mounting spaces is levitated in the second direction by the repulsive force with the stationary magnet, the switch is turned on by the levitated outermost displacement identification magnet (Turn on) ) to warn the outside that the displacement of the girder in the throttle direction is in a dangerous state;
5. The method of claim 4,
The warning means is
Displacement measuring device for bridge superstructure, characterized in that it is a light source module including a light source that is turned on when the switch is turned on by a displacement identification magnet.
5. The method of claim 4,
The warning means is
When the switch is turned on by the displacement identification magnet, the internal control circuit generates a dangerous signal, converts the generated dangerous signal into a form that can be transmitted wirelessly, and is a communication module equipped with a communication antenna that transmits wirelessly to an external bridge monitoring system. Displacement measuring device in the axial direction of the bridge superstructure, characterized in that.

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