Measurement unit for measuring displacement of bridge bearing

Abstract

The present invention relates to a measurement unit for measuring the displacement of a bridge bearing positioned between a pier and an upper plate. More specifically, a pair of elevation measurement bodies that slide in the transverse direction along the lengthwise-direction of a base member are attached thereon, each elevation measurement body comprising a lower marker rod located on the base member and an upper movable rod that moves up and down from the top of the lower marker rod. As such, with the base member placed on the lower plate of a bridge bearing and a pair of elevation measurement bodies suitably slide-adjusted at both width-direction ends of the bridge bearing, the vertical distance between the upper and lower plates is measured at both sides using the elevation measurement bodies to rapidly measure the displacement of the bridge bearing.

Description

Measuring unit for measuring displacement of bridge bearing devices

[0001] The present invention relates to a measuring unit for measuring the displacement of a bridge pier located between a bridge pier and a top plate, and more specifically, to a displacement measuring unit for a bridge pier, which comprises a pair of lifting measuring bodies that slide along the longitudinal direction of a base member, and wherein the lifting measuring bodies are configured to measure the horizontal height difference between the lower plate and the upper plate of the bridge pier by lifting and lowering, thereby enabling the displacement state of the bridge pier to be measured quickly and accurately, and further improving the usability of the measuring unit and the convenience of carrying and storing it.

[0002] Typically, a bearing device is installed between the bridge pier and deck to transfer the load acting on the bridge deck to the pier and to safely adapt to changes in the bridge deck caused by internal factors of the bridge, such as deflection due to the deck's own weight, creep, drying, and shrinkage of concrete, and external factors, such as earthquakes, wind, or temperature changes.

[0003] That is, the bridge deck repeatedly experiences dynamic loads from vehicle traffic and thermal expansion due to changes in ambient temperature, causing deformation in the direction of the bridge axis and in the direction perpendicular to the direction of the bridge axis. This deformation of the bridge deck normally occurs due to changes in vehicle traffic and the surrounding environment, but if the deformation exceeds the allowable limit, it will cause cracks in the bridge. Therefore, the deformation of the bridge deck is regularly measured and compared with the allowable limit, and repairs and reinforcements are carried out before cracks occur in the bridge.

[0004] At this time, the method for measuring the deformation of the bridge deck as described above is not a direct measurement of the bridge deck, but a displacement measurement method for the bridge bearing supporting the bridge from the pier is mainly used. The bridge bearing is composed of a lower plate fixed to the upper part of the pier, an upper plate fixed to the bottom surface of the steel plate, and a buffer means located between the lower plate and the upper plate. When deformation occurs in the bridge deck due to internal and external factors, displacement will inevitably occur in the bridge bearing due to compression or pushing of the buffer, and this displacement amount is measured by a parallelism measurement or a horizontality or verticality measurement method between the lower plate and the upper plate using a separately provided measuring device, etc., to determine repair and reinforcement, etc.

[0005] However, the precision safety diagnosis of a bridge through the measurement of such a bridge seat device requires continuous and repeated operation of a separate measuring device, so not only is it difficult to install the measuring device, but there is also a problem that it is not easy to correct the measurement error. Recently, as in Utility Model Registration No. 0368373, in a measuring device installed for the precision safety diagnosis of a bridge seat device installed between a bridge pier structure and a bridge deck, the measuring device for the precision safety diagnosis of the bridge seat device is configured to measure the vibration of the elastic bearing between the upper and lower sole plates of the bridge seat device by fixing the measuring device for precision safety diagnosis to the side of the upper and lower sole plates so as to measure the displacement of the elastic bearing due to the load of the bridge deck, and the measuring device for precision safety diagnosis is configured to form a ㄷ-shaped fastening frame at the upper and lower ends and form a fastening hole at the side, and use a fastening bolt in the fastening hole to fix the ㄷ-shaped fastening frame to the side of the upper and lower sole plates of the bridge seat device, and the ㄷ-shaped A measuring device for precise safety diagnosis of a bridge bearing device has been proposed, in which a semicircular ring is welded to opposite sides of the upper and lower parts of the fastening frame, and a dial gauge having a circular scale plate and a measuring fastening stand attached to both sides is vertically or obliquely fastened to the semicircular ring attached to the U-shaped fastening frame using a deformation-sensing spring with fastening rings attached to both sides, so that the displacement of the bearing device due to the load of the bridge deck can be precisely measured.

[0006] However, the above background technology had problems in that it was difficult to install, precise measurement was impossible, and errors during installation were difficult to correct. Accordingly, as in the case of Patent No. 10-1695323, a displacement measuring device for measuring displacement of a bridge seat, which is composed of a lower plate connected to the lower structure of a bridge, an upper plate connected to the upper structure of the bridge, and an elastic member formed between the lower plate and the upper plate, has been registered, including: a pair of lower fixing members each having a fixing part fixed to each side of the lower plate and a coupling part formed vertically above the fixing parts; a lower fixing member each having a measuring instrument whose both ends are fixed to the lower fixing members so as to be positioned between the pair of lower fixing members; an upper fixing member each having a fixing part fixed to one side of the upper plate and a coupling part formed vertically below the fixing part; and a graduation indicating member whose upper end is fixed to the coupling part and formed vertically below the upper fixing member to indicate a graduation of the measuring instrument.

[0007] However, since the displacement measuring means of the bridge seat of the preceding example is directly installed and fixed to the bridge seat, the productivity of the bridge seat itself is extremely poor, and the individual unit price of the bridge seat increases excessively, making it very uneconomical. In addition, if a rapid displacement occurs due to internal or external factors, the displacement measuring means may be damaged or cause measurement errors. In addition, if the bridge is installed on the sea level or in a location adjacent to the sea, the displacement measuring means may corrode and lose its function, so it has the disadvantage of having an extremely short service life.

[0008] The present invention is an improvement over the aforementioned problem, and comprises a pair of lifting measuring bodies that are formed by joining together on the upper portion of a base member and sliding laterally along the longitudinal direction of the base member, and the lifting measuring bodies are composed of a lower indicator bar positioned on the base member and an upper lifting port that is raised and lowered from the upper portion of the lower indicator bar, thereby:

[0009] The purpose of the present invention is to provide a displacement measuring unit for a bridge bridge seat, which can quickly and rapidly measure the displacement of the bridge seat by measuring the upper and lower gaps on both sides of the lower plate and upper plate using each of the elevation measuring bodies while placing a base member on the lower plate of the bridge seat and slidingly adjusting a pair of elevation measuring bodies to fit the widthwise ends of the bridge seat.

[0010] In order to achieve the above-mentioned object, the present invention is to provide a bridge seat comprising a lower plate fixed to the upper part of a bridge pier, an upper plate fixed to the lower part of a bridge deck, and a buffer member between the lower plate and the upper plate, wherein a pair of elevation measuring bodies that slide laterally along the longitudinal direction of the base member are formed on the upper part of a rectangular base member positioned on the lower plate of the bridge seat, thereby configuring the mutual distance between the pair of elevation measuring bodies from the base member and the height measurement between the lower plate and the upper plate using the pair of elevation measuring bodies, wherein the elevation measuring body comprises a lower indicator rod positioned on the base member and an upper elevator port coupled to the upper part of the lower indicator rod, and a vertical graduation portion is formed on the outer surface of the lower indicator rod.

[0011] The present invention can quickly and accurately measure the displacement of an existing bridge bearing installed on a bridge, and thus can be utilized as effective data for safety inspection, maintenance, and reinforcement of the bridge. It is very convenient to use, so that anyone, even a non-expert or unskilled person, can accurately measure the displacement of the bridge bearing. It is very effective because it can be used interchangeably with various sizes of bridge bearings having different widths or heights depending on the size, shape, and structure of the bridge. When not in use, it can be reduced to a minimum size and disassembled, so that it is very convenient for portability, transportation, and storage. It also has the effect of being able to be simply assembled and used when reused.

[0012] Figure 1 is an example of application of the measuring unit of the present invention.

[0013] Figure 2 is a perspective view of the entire seat device measuring unit of the present invention.

[0014] Figure 3 is a complete exploded perspective view of the seat device measuring unit of the present invention.

[0015] Figure 4 is an enlarged perspective view of the main part of the seat device measuring unit of the present invention.

[0016] Figure 5 is an overall plan view of the seat device measuring unit of the present invention.

[0017] Figure 6 is a side cross-sectional view of the seat device measuring unit of the present invention.

[0018] Figure 7 is a diagram illustrating the width-direction length variation of the seat device measuring unit of the present invention.

[0019] Figure 8 is a diagram illustrating a separation example of the seat device measuring unit of the present invention.

[0020] Figure 9 is another embodiment of a lifting measuring body in a seat device measuring unit of the present invention.

[0021] Additional objects, features and advantages of the present invention can be more clearly understood from the following detailed description and accompanying drawings.

[0022] Before going into a detailed description of the present invention, it should be understood that the present invention can be modified in various ways and can have various embodiments, and that the examples described below and illustrated in the drawings are not intended to limit the present invention to specific embodiments, but include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

[0023] Additionally, when a component is referred to as being "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may be other components present in between. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components present in between.

[0024] Hereinafter, the terminology used in this specification is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, it should be understood that the terms "comprise" or "have" are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0025] Additionally, terms such as “... part,” “... unit,” and “... module” described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware, software, or a combination of hardware and software.

[0026] In addition, when describing with reference to the attached drawings, identical components will be assigned the same reference numerals regardless of the drawing numbers, and redundant descriptions thereof will be omitted. When describing the present invention, if a detailed description of a related known technology is judged to unnecessarily obscure the gist of the present invention, such detailed description will be omitted.

[0027] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0028] FIG. 1 is an application example diagram for the measuring unit of the present invention, FIG. 2 is an overall perspective view of the seat device measuring unit of the present invention, FIG. 3 is an overall separated perspective view of the seat device measuring unit of the present invention, FIG. 4 is an enlarged separated perspective view of a main part of the seat device measuring unit of the present invention, FIG. 5 is an overall plan view of the seat device measuring unit of the present invention, and FIG. 6 is a side cross-sectional view of the seat device measuring unit of the present invention.

[0029] The measuring unit for a bridge pier according to the present invention, such as a city, is for measuring the displacement of a bridge pier (30) composed of a lower plate (31) fixed to the upper part of a bridge pier (10), an upper plate (32) fixed to the lower part of a bridge deck (20), and a buffer member (33) between the lower plate (31) and the upper plate (32). As the weight of the bridge deck (20) and the load of a vehicle moving on the deck (20), or the load caused by wind, impact, or vibration, etc., are repeatedly applied to the deck (20), the bridge pier (30) buffers such load and transmits it to the pier, thereby maintaining and managing the safety status of the bridge through periodic inspection and measurement.

[0030] Accordingly, the measuring unit of the present invention as a displacement measuring means of the above-mentioned seat device (30) is configured to form a pair of elevation measuring bodies (200)(200') that slide laterally along the longitudinal direction of the base member (100) on the upper part of a rectangular base member (100) located on the lower plate (31) of the seat device (30), thereby adjusting the mutual separation distance between the pair of elevation measuring bodies (200)(200') from the base member (100) and measuring the height between the lower plate (31) and the upper plate (32) using the pair of elevation measuring bodies (200)(200').

[0031] In addition, the above-described elevation measuring body (200)(200') is composed of a lower indicator bar (210) positioned on a base member (100) and an upper elevation port (220) coupled to the upper portion of the lower indicator bar (210), and is configured such that a vertical graduation portion (211) is formed on the outer surface of the lower indicator bar (210).

[0032] In this way, the base member (100) of the measuring unit of the present invention is placed on the lower plate (31) of the seat device (30) to be inspected, and a pair of lifting measuring bodies (200)(200') are slidably moved from the base member (100) so that each lifting measuring body (200)(200') is positioned at the ends of both sides of the lower plate (31) and the upper plate (32), and when the upper lifting port (220) of the lifting measuring body (200)(200') is raised from the lower indicator bar (210) so that the tip of the upper lifting port (220) is brought into contact with the bottom surface of the upper plate (32), the lower end of the upper lifting port (220) is positioned at the graduation portion (211) formed on the lower indicator bar (210) of the lifting measuring bodies (200)(200') on both sides, so that the graduation portion (211) of the corresponding position is measured. The height between the lower plate (31) and the upper plate (32) can be visually confirmed.

[0033] Accordingly, the height difference for each of the elevation measuring bodies (200)(200') can be visually confirmed according to the indicated positions of the scales (211) of the lower indicator bars (210) provided on a pair of elevation measuring bodies (200)(200'). If the indicated scales of the elevation measuring bodies (200)(200') on both sides are the same, it means that no displacement of the bridge seat (30) has occurred, and if one of the numbers is larger or smaller, it means that it has tilted in the corresponding direction. Therefore, through the displacement amount or the change in the displacement amount that can be quantified, the displacement status of the bridge seat (30) or the displacement amount and safety level of the bridge can be quickly and simply confirmed and inspected.

[0034] Here, the lifting measuring body (200)(200') as described above is configured to move laterally from the base member (100) by a separately provided slider (300)(300') coupled to the lower end of the lower indicator bar (210), and a pair of 'ㅗ'-shaped sliding grooves (101)(101') facing from both ends toward the center are formed on the upper surface of the base member (100), and a 'ㅗ'-shaped fitting hole (300a) is formed protrudingly on the lower surface of the slider (300)(300') to be inserted into the sliding grooves (101)(101'), so that the lifting measuring body (200)(200') coupled to the slider (300)(300') can freely move laterally from the base member (100) by way of the slider (300)(300'), depending on the size of the seat device (30). It will be possible to measure displacement for a seat device (30) of almost any size without any restrictions.

[0035] In particular, the base member (100) as described above is configured by repeatedly forming a hooking groove (102)(102') formed along the longitudinal direction on one side thereof, and a hooking pin (310) that is elastically coupled to the hooking groove (102)(102') is formed on the slider (300)(300'). The hooking pin (310) is configured to be horizontally coupled to a vertical portion (301) that protrudes downward on one side of the slider (300)(300'), and a grip portion (311) having an expanded outer diameter is formed on the end of the hooking pin (310) located on the outer side of the vertical portion (301), and a separately provided elastic spring (320) that is restrained by a stop ring (321) may be formed on the hooking pin (310) located on the inner side of the vertical portion (301).

[0036] Accordingly, in the case where the above slider (300)(300') or the lifting measuring body (200)(200') is to be moved laterally, the grip part (311) of the electric catch pin (310) is pulled so that the catch pin (310) compresses the elastic spring (320) and is detached from the catch groove (102)(102') of the base member (100), thereby releasing the fixation state of the slider (300)(300') to the base member (100), so that the slider (300)(300') can be easily moved, and after the slider (300)(300') is moved to the desired position from the base member (100), the grip part (311) that was being pulled is naturally released so that the catch pin (310) is moved to the corresponding position by the elastic restoring force of the elastic spring (320). The slider (300)(300') that has been moved by being inserted into the locking groove (102)(102') will be able to remain fixed to the base member (100).

[0037] At this time, the above-mentioned catch groove (102)(102') is configured as a composite with one side of an inclined surface and the other side of a straight surface, so that movement in one direction of the inclined surface can be easily moved by artificial force without forcibly pulling the catch pin (310) using the grip part (311), while movement in the other direction of the straight surface can be possible only when the catch pin (310) is forcibly pulled, thereby enabling the one-side position movement of the lift measuring body (200)(200') during high-altitude work to be performed more easily, and at the same time, the lift measuring body (200)(200') that has been moved is prevented from automatically returning to its original position, so that the position adjustment of the lift measuring body (200)(200') can be performed more safely and conveniently.

[0038] In particular, as described above, a vertical screw projection (302) is formed on the upper surface of the slider (300)(300'), and a female screw groove (212) is formed on the lower end of the lower indicator rod (210) of the elevation measuring body (200)(200'), so that the lower indicator rod (210) is screw-connected to the slider (300)(300'), so that when the measuring unit of the present invention is not used, the elevation measuring body (200)(200') can be separated from the slider (300)(300') and transported and stored in a minimum size. In addition, a vertical rib (304) having a horizontal screw projection (303) is further protruded on one side of the upper portion of the slider (300)(300'), so that the lower indicator rod (210) separated from the vertical screw projection (302) is screw-connected to the horizontal screw projection (303). It is possible to configure the lifting measuring body (200)(200') separated from the slider (300)(300') so that it can be stored and transported in a horizontal state more easily and safely.

[0039] Next, in the case of the base member (100) described above, the middle part thereof may be divided and formed, an expansion guide groove (103) may be formed on one upper surface of the divided one-sided base member (100), and an expansion guide member (105) may be formed protrudingly on one end of the divided other-sided base member (100) to be inserted into the expansion guide groove (103), and a fixing screw hole (104)(104') repeatedly formed along the longitudinal direction may be formed in the expansion guide groove (103), and a bolt knob (106) may be formed to be screw-connected to the fixing screw hole (104)(104') in the expansion guide member (105).

[0040] Accordingly, in the case where the width of the seat device (30) is very large, as shown in FIG. 7, the bolt knob (106) is loosened to laterally expand the divided base member (100), and then the bolt knob (106) is screwed into the fixing screw hole (104)(104') at the corresponding position in the expansion guide groove (103) so that the expanded state can be maintained. Since the fixing screw hole (104)(104') is repeatedly formed in the expansion direction of the base member (100), the base member (100) can be freely expanded to a desired width, and the mutual separation width of the lifting and lowering measuring bodies (200)(200') as described above can be arbitrarily adjusted. Therefore, measurement and gauging for a seat device (30) of almost any size can be performed simply and smoothly, regardless of the size of the seat device (30).

[0041] After measuring the displacement of the bridge seat in the bridge using the measuring unit for the bridge seat of the present invention, the measuring unit is disassembled and transported and stored in a minimum size, and the base member (100) in the expanded state is tightly coupled so that the split ends are in contact with each other and are mutually coupled and fixed by screwing the bolt knob (106) and the fixing screw hole (104)(104'), and a pair of elevation measuring bodies (200)(200') is assembled by separating the lower indicator rod (210) from the vertical screw projection (302) of each slider (300)(300') and screwing the female screw groove (212) of the lower indicator rod (210) to the horizontal screw projection (303) formed in the vertical rib (304) of the slider (300)(300'), as shown in FIG. 8, thereby a pair of elevation measuring bodies (200)(200') Since it will be maintained in a horizontal state in close contact with the base member (100), it will be possible to carry and store the measuring unit of the present invention with a minimum size.

[0042] At this time, the above base member (100) may be transported and stored as a single assembled form as described above, or, if necessary, may be transported and stored separately in a divided form, that is, in a form corresponding to half the length of the entire base member (100). This can be varied according to the situation at each site or the convenience of the operator, so that the convenience of use can be further improved.

[0043] Next, in the case of the electric elevation measuring body (200)(200'), it is composed of a lower indicator rod (210) and an upper elevation port (220). As an example, a male screw portion (213) is formed on the outer surface of the lower indicator rod (210), and a downward penetrating female screw groove (221) is formed on the upper elevation port (220), so that the upper elevation port (220) can be configured to be raised and lowered up and down from the lower indicator rod (210) by rotating the upper elevation port (220) as the upper elevation port (220) is screw-connected to the lower indicator rod (210).

[0044] Accordingly, when the base member (100) is placed on the lower plate (31) of the seat device (30) and the gap between a pair of elevation measuring bodies (200)(200') is slidably adjusted according to the size of the seat device (30), and the upper elevation opening (220) of the elevation measuring body (200)(200') is rotated so that the tip of the upper elevation opening (220) reaches the bottom surface of the upper plate (32), the gap or height between the lower plate (31) and the upper plate (32) can be accurately measured through the scale portion (211) of the lower indicator bar (210) indicated by the lower end of the upper elevation opening (220).

[0045] In the case of the lifting measuring body (200)(200') like this, since the lower indicator bar (210) and the upper lifting port (220) are screw-connected to each other, there is a disadvantage that the upper lifting port (220) must be continuously rotated to rise or lower, so as another embodiment, as shown in FIG. 9, a vertical guide groove (214) is formed on the outer surface of the lower indicator bar (210), and a lifting groove (222) having an inwardly protruding retaining protrusion (223) at the bottom is formed in the upper lifting port (220), so that the upper lifting port (220) is raised and lowered with the lower indicator bar (210) while the retaining protrusion (223) is inserted into the guide groove (214), but a separately provided elastic spring (230) is inserted and formed between the tip of the lower indicator bar (210) and the inner tip of the lifting groove (222). It may also be configured so that the upper lift port (220) can be flexibly raised and lowered from the lower indicator bar (210) by means of a spring (230).

[0046] Accordingly, in the process of placing the base member (100) on the lower plate (31) of the seat device (30), the upper lift port (220) of the lift measuring body (200) (200') is lowered so that the built-in elastic spring (230) is compressed, and when the base member (100) is settled on the lower plate (31) and the lift measuring body (200) (200') is positioned at the lower part of the upper plate (32), the force of the upper lift port (220) that was lowering it is removed, so that the tip of the upper lift port (220) automatically comes into contact with the lower surface of the upper plate (32) by the reaction force of the elastic spring (230), and at the same time, the lower end of the upper lift port (220) will refer to the graduation portion (211) indicated on the lower indicator bar (210), so that the seat device (30) can be more easily and quickly It will be possible to measure the gap or height between the lower plate (31) and the upper plate (32).

[0047] Accordingly, the measuring unit for a seat device of the present invention can measure displacement of a seat device of various sizes, positions or shapes more quickly, accurately and safely, and has a very simple structure, allowing for very fast and effective operation and measurement. In addition, when not in use, it can be reduced to a minimum size or disassembled for transport, portability and storage, making it very efficient.

[0048] The embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them.

Claims

1. For a bridge seat (30) comprising a lower plate (31) fixed to the upper part of a bridge pier (10), an upper plate (32) fixed to the lower part of a bridge deck (20), and a buffer member (33) between the lower plate (31) and the upper plate (32), a pair of elevation measuring bodies (200) (200') that slide laterally along the longitudinal direction of the base member (100) are combined and formed on the upper part of a rectangular base member (100) positioned on the lower plate (31) of the aforementioned bridge seat (30), so that the mutual separation distance between the pair of elevation measuring bodies (200) (200') from the base member (100) and the height measurement between the lower plate (31) and the upper plate (32) using the pair of elevation measuring bodies (200) (200') are respectively performed. The above-mentioned lifting measuring body (200)(200') is composed of a lower indicator bar (210) positioned on a base member (100) and an upper lifting port (220) coupled to the upper portion of the lower indicator bar (210), and a measuring unit for measuring displacement of a bridge bearing device characterized in that a vertical scale (211) is formed on the outer surface of the lower indicator bar (210).

2. In paragraph 1, The lifting measuring body (200)(200') is configured to move laterally from the base member (100) by a separately equipped slider (300)(300') coupled to the lower end of the lower indicator bar (210). A measuring unit for measuring displacement of a bridge bearing device, characterized in that a pair of 'ㅗ'-shaped sliding grooves (101)(101') are formed on the upper surface of the base member (100) from both ends toward the center, and a 'ㅗ'-shaped fitting (300a) is formed protrudingly on the lower surface of the slider (300)(300') to be inserted into the sliding grooves (101)(101').

3. In paragraph 2, On one side of the base member (100), a catch groove (102) (102') formed along the longitudinal direction is repeatedly formed, and a catch pin (310) that is elastically connected to the catch groove (102) (102') is formed on the slider (300) (300'). A measuring unit for measuring displacement of a bridge bearing device, characterized in that the above-mentioned catch pin (310) is horizontally coupled to a vertical portion (301) protruding downward on one side of a slider (300) (300'), a grip portion (311) having an expanded outer diameter is formed at the end of the catch pin (310) located on the outside of the vertical portion (301), and a separately provided elastic spring (320) is coupled and formed to be restrained by a stop ring (321) at the catch pin (310) located on the inside of the vertical portion (301).

4. In paragraph 2, A vertical screw projection (302) is formed on the upper surface of the slider (300)(300'), and a female screw groove (212) is formed on the lower end of the lower indicator bar (210) of the lifting measuring body (200)(200'), so that the lower indicator bar (210) is screw-connected to the slider (300)(300'). A measuring unit for measuring displacement of a bridge bearing device, characterized in that a vertical rib (304) having a horizontal screw projection (303) is formed protrudingly on one side of the upper portion of the slider (300)(300'), so that a lower indicator bar (210) separated from the vertical screw projection (302) can be stored and transported in a horizontal state by being screwed to the horizontal screw projection (303).

5. In paragraph 1, The base member (100) is formed by dividing the middle portion, and an expansion guide groove (103) is formed on one upper surface of the divided one-sided base member (100), and an expansion guide member (105) is formed protrudingly on one end of the divided other-sided base member (100) to be inserted into the expansion guide groove (103). A measuring unit for measuring displacement of a bridge bearing device, characterized in that the expansion guide groove (103) is formed with a fixed screw hole (104) (104') repeatedly formed along the longitudinal direction, and the expansion guide member (105) is formed with a bolt knob (106) screw-connected to the fixed screw hole (104) (104').

6. In paragraph 1, A measuring unit for measuring displacement of a bridge bearing device, characterized in that a male screw portion (213) is formed on the outer surface of a lower indicator bar (210), and a female screw groove (221) is formed in a downward penetrating upper lift port (220), so that the upper lift port (220) is raised and lowered from the lower indicator bar (210) by rotation of the upper lift port (220) as the upper lift port (220) is screw-connected to the lower indicator bar (210).

7. In paragraph 1, A vertical guide groove (214) is formed on the outer surface of the lower indicator bar (210), and a lifting groove (222) having an inwardly protruding guide projection (223) is formed on the upper lift port (220) so that the upper lift port (220) is raised and lowered with the lower indicator bar (210) while the guide projection (223) is inserted into the guide groove (214). A measuring unit for measuring displacement of a bridge seat device, characterized in that a separate elastic spring (230) is inserted and formed between the tip of the lower indicator bar (210) and the inner tip of the lifting groove (222), so that the upper lifting hole (220) is elastically raised and lowered from the lower indicator bar (210) by the elastic spring (230).

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