KR101615097B1 - Displacement measuring apparatus using ring type elastic plate - Google Patents

Displacement measuring apparatus using ring type elastic plate Download PDF

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Publication number
KR101615097B1
KR101615097B1 KR1020160019410A KR20160019410A KR101615097B1 KR 101615097 B1 KR101615097 B1 KR 101615097B1 KR 1020160019410 A KR1020160019410 A KR 1020160019410A KR 20160019410 A KR20160019410 A KR 20160019410A KR 101615097 B1 KR101615097 B1 KR 101615097B1
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South Korea
Prior art keywords
displacement
elastic plate
annular elastic
plate
detection
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Application number
KR1020160019410A
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Korean (ko)
Inventor
김일곤
이길호
Original Assignee
케이에스엠기술 주식회사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M1/00—Testing static or dynamic balance of machines or structures
    • G01M1/02—Details of balancing machines or devices
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
    • G01M5/0008—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of bridges

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)

Abstract

The present invention relates to a device to measure displacement of a structure such as a bridge by having a displacement gauge (10) inside. The displacement gauge (10) is installed in a ring-shaped elastic plate (20) wherein both sides are curved as an arc shape, and a lower end fixated to the ground, as a regular tension state is applied in a connection line (19) with a structure using contraction elasticity of the ring-shaped elastic plate (20). According to the present invention, a sufficient contraction elasticity is able to be applied between a main body (11) of the displacement gauge (10) and a detection stick (12) of the displacement gauge (10) connected to a structure (99) to be tested by the connection line (19). Moreover, a stable tension state is able to be applied in the connection line (19) connecting the detection stick (12) and the structure (99) to be tested; thus accurate displacement measurement is able to be performed without a large facility such as a temporary pillar (98) and the like.

Description

Technical Field [0001] The present invention relates to an apparatus for measuring a displacement of a structure using an annular elastic plate,

The present invention relates to an apparatus for measuring the displacement of a bridge structure including a displacement gauge (10), comprising an annular elastic plate (20) whose both sides are curved in an arcuate shape and whose lower ends are fixed on the ground, It is possible to measure the displacement of the structure without the provision of the stiff strut 98 by providing the displacement gauge 10 on the connecting line 19 with the structure by means of the shrinking elastic force of the annular elastic plate 20. [ .

The displacement of a structure spaced upward from the ground such as a girder of a bridge or a slab of a large building is obtained by fixing the main body 11 of the displacement meter 10 to the lower ground surface of the detection structure 99, By connecting the detection rod 12 of the displacement meter 10 to the detection structure 99 so that the detection rod 12 of the displacement meter 10 is moved up and down with the detection structure 99 as the elevation displacement is generated in the detection structure 99 Such a conventional various structure displacement measurement method is illustrated in FIG.

The structure displacement measurement using the displacement meter 10 that detects the distance that the detection rod 12 is inserted or withdrawn to the main body 11 such as the LVDT (Linear Variable Differential Transformer) The main body 11 is directly connected to the structure 99 and the main body 11 is fixed on a stationary support point independent of the test structure 99. The measurement of the girder of the bridge spaced at a considerable distance from the ground In the structure 99, various means for fixing the main body 11 of the displacement gauge 10 are required.

First, as a conventional method, as in the left extract of FIG. 1, a standing post 98 is erected on the lower ground of the test structure 99 and the main body 11 of the displacement meter 10 is placed on the upper surface of the post 101 There is a problem in that it takes a lot of cost and time to install and dismantle the temporary support column 98 and it is impossible to apply it to an ultra-large bridge having a very high girder height.

The main body 11 of the displacement meter 10 is fixed to the ground with a heavy object 18 or the like and the tip of the detection rod 12 of the displacement gauge 10 is connected to the test structure 12 via a connection line 19, A technique has been developed in which a coil spring 15 for applying a constant tensile force is provided between the tip end of the detection rod 12 and the main body 11 to provide a constant tension state in the connecting line 19 after the connection As prior arts, Patent No. 865875 and Patent No. 1202190 can be mentioned.

First of all, as in the central excerpt of FIG. 1, the patent document No. 865875 discloses a body fixture 13 for fixing the lower end of the main body 11 to the ground with the heavy object 18 being bound, the detection rod 12 and the connecting line 19, A plurality of coil springs 15 are provided between the fixed detection bobbin jigs 14 so that the shrinking elastic force of the coil springs 15 always tension between the main fixture 13 and the detection bong jigs 14 So that the connecting line 19 is kept in a state of being tense at all times and therefore when the downward displacement occurs in the test structure 99, the detection bag tongue 14 moves downward and the detection structure 99 Down displacement measurement becomes possible.

However, in Patent No. 865875, a plurality of independent small coil springs 15 are arranged radially with respect to the planar displacement meter 10, and the possibility that a deviation occurs in the behavior of each coil spring 15 There is a problem that it is directly connected to a measurement error.

1, a large single coil spring 15 is applied between the main body fastener 13 and the detection bong hole jig 14, and the coil spring 15 It is possible to solve the problem of the patent No. 865875. However, due to the inconsistency of the point of the coil spring 15 which is unavoidable in the structure, it is necessary to dispose the connecting rod 19 and the entire measuring device 12 And the measurement error is amplified.

1, the center point of the spring and the fixed point of the object to be mounted are inevitably mismatched due to the characteristic of the coil spring 15 formed by the spiral of the metal wire rod, It is forced to concentrate on the outer periphery of the spring which is not the center.

Therefore, when the single coil spring 15 is applied, the point of action of the shrinking elastic force is not a center point of the detection bong hole fixture 14 and the main fixture 13 but a point spaced apart from the center point by a distance corresponding to the radius of the coil spring 15 So that the horizontal partial force acts on the overall measuring apparatus including the connecting line 19 due to the biasing of the shrinking elastic force in a plane, and serious vibration is caused.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a structure displacement measuring apparatus in which a displacement gauge 10 constituting a main body 11 and a detection rod 12 is incorporated, A displacement gauge 10 is installed inside the annular elastic plate 20 in which the arc curved portion 21 of the plate chain is formed and the upper plate portion 22 and the lower plate portion 23 are respectively formed at the upper and lower ends, The lower portion of the upper portion 11 of the annular elastic plate 20 is fixed to the upper surface of the lower plate portion 23 of the annular elastic plate 20 and the upper portion of the detection rod 12 of the displacement gauge 10 is fixed to the bottom surface of the upper plate portion 22 of the annular elastic plate 20, The lower surface of the lower plate 23 is fixed to the lower surface of the test structure 99 and the upper surface of the upper plate 22 is bound to the test structure 99 and the connecting line 19. The upper plate 22 of the annular elastic plate 20 And the lower plate portion 23 are in close proximity to each other acts between the main body 11 of the displacement gauge 10 and the detection rods 12, Is a structure displacement measuring device.

The cut-out portion 26 is formed in the arc-shaped curved portion 21 in a direction parallel to the detection rod 12 of the displacement meter 10. The cut-out portion 26 is formed with a curved portion 21 in a direction opposite to the arc- And an inverted curved portion (27) is formed on the inner surface of the annular elastic plate.

It is possible to detect the position of the detection rods 12 of the displacement gauge 10 connected to the detection structure 99 via the connection line 19 and the main body 11 of the displacement gauge 10 fixed to the ground even when the coil spring 15 is excluded, A sufficient tension can be exerted between the detection rods 12 and the detection structure 99 and the connection line 19 connecting the detection rods 12 and the detection structure 99 can be stably tensioned, Accurate and sensitive displacement measurement is possible without the need.

Particularly, by resolving the unevenness of the shrinking elastic force caused by the application of the coil spring 15 and the vibration problem, it is possible to drastically improve the displacement measurement accuracy.

FIG. 1 is a diagram illustrating a conventional method of using a structure displacement measuring apparatus
2 is a perspective view of the present invention
FIG. 3 is a diagram illustrating a method of using the present invention
Fig. 4 is an illustration of a deformed state of the annular elastic plate according to the present invention
5 is an exploded perspective view of a preferred embodiment of the present invention,
Figure 6 is a representative cross-sectional view of the embodiment of Figure 5

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A detailed configuration of the present invention will be described with reference to the accompanying drawings.

2 and 3 illustrate an appearance and a use state of the present invention. As shown in the figure, the present invention includes a displacement meter 10 including a main body 11 and a detection rod 12, An apparatus for measuring the displacement of a structure 99 is provided with an arcuate curved portion 21 which is curved in an arcuate shape on both sides and an annular portion 21 having an upper plate portion 22 and a lower plate portion 23, The lower portion of the main body 11 of the displacement gauge 10 is fixed to the upper surface of the lower plate portion 23 of the annular elastic plate 20 and the detection of the displacement gauge 10 The upper portion of the rod 12 is fixed to the bottom surface of the upper plate portion 22 of the annular elastic plate 20. The bottom surface of the lower plate portion 23 is fixed to the bottom surface of the lower surface of the detection structure 99, (99) and a connecting line (19).

4, the annular resilient plate 20 of the present invention is a closed type curved plate having a displacement gauge 10 built in its central portion. The resilient arcuate curved portion 21 curved in an arcuate shape on both sides is connected to a displacement gauge 10, And upper and lower end portions of the arcuate curved portions 21 are connected to the upper plate portion 22 and the lower plate portion 23, respectively.

The lower plate portion 23 connecting the lower end portions of the arcuate curved portions 21 of the annular elastic plate 20 is a plate member which is horizontal when the displacement measurement device of the present invention is installed. As shown in Figs. 2 to 4, The lower end of the main body 11 of the displacement gauge 10 is firmly fixed to the center of the upper surface and the bottom surface of the lower plate 23 is fixed to the ground as shown in Fig.

As shown in FIG. 1, in the conventional displacement measuring apparatus, the displacement meter 10 is fixed to the ground by the heavy object 18, but when the heavy object 18 is applied or when the tension on the connecting line 19 is increased, In the present invention, as shown in FIG. 2, the annular elastic plate 20 is fixed through the fastening plate 30 firmly adhered to the ground by the type pin 31.

That is, as shown in FIG. 2, a tightening plate 30 which is in close contact with the bottom surface of the test structure 99 is formed, a type pin 31 penetrating the tightening plate 30 and penetrating the ground, The annular elastic plate 20 can be fixed firmly to the ground by bonding the plate 30 and the bottom surface of the lower plate portion 23 of the annular elastic plate 20 to each other. A stretching device 32 such as a turnbuckle may be provided between the lower plate portion 23 and the lower plate portion 23 to adjust the distance between the contact plate 30 and the annular elastic plate 20, It is.

The annular elastic plate 20 of the present invention may be a metal plate or a high strength synthetic resin plate or the like. In the illustrated embodiment, the arc-shaped curved portion 21, the upper plate portion 22 and the lower plate portion 23 are integrally formed But it is also possible that the arc portion 21 that gives the annular elastic plate 20 elastic force to shrink, the lower plate portion 23 to which the main body 11 is fixed, the connection line 19 and the detection rod 12 The upper plate portions 22 to be joined may be made of different materials and then joined and assembled.

2, when the displacement gauge 10 is installed in the annular elastic plate 20, a fixing pipe 24 protruding upward is provided on the upper surface of the lower plate 23 of the annular elastic plate 20, The main body 11 of the displacement gauge 10 and the annular elastic plate 20 are fixed in such a manner that a plurality of fixing screws passing through the fixing pipe 24 are fastened with the lower portion of the main body 11 of the displacement gauge 10 inserted The lower plate portion 23 can be mutually fixed.

When the external force is exerted on the annular elastic plate 20, the arc-shaped portions 21 on both sides of the annular elastic plate 20 are deformed And the curvature of the arcuate curved portion 21 is changed. As shown in Fig. 4, the shrinking elastic force in the direction in which the upper plate portion 22 and the lower plate portion 23 are close to each other acts.

That is, the displacement gauge 10 and the connecting line 19 are provided after the upper plate portion 22 and the lower plate portion 23 of the annular elastic plate 20 are forcibly separated from each other when the displacement gauge 10 is built in and the connection line 19 is connected The shrinking elastic force is always applied between the upper plate portion 22 and the lower plate portion 23 by the restoring force of the arc-shaped curved portion 21 of the annular elastic plate 20, whereby the main body 11 of the displacement gauge 10, And the detection rod 12 is always contracted.

3, when the displacement measuring device of the present invention is installed between the detection structure 99 and the ground, when the connection line 19 in the normally tense state is lowered due to the occurrence of the downward displacement of the detection structure 99, The downward displacement of the test structure 99 can be measured as the detection rod 12 is inserted into the main body 11 while the upper plate portion 22 and the lower plate portion 23 of the plate 20 are close to each other.

The detection line 12 of the displacement gauge 10 is pulled out from the main body 11 so that the detection line 12 is pulled out from the main body 11, The upward displacement of the structure 99 can be measured.

An elastic body which imparts a tensile force to the connection line 19 and gives a shrinking elastic force between the detection rod 12 and the main body 11 of the displacement gauge 10 through the annular elastic plate 20 of the present invention is integrated with a single material Therefore, due to the application of the coil spring 15, it is possible to solve the problem of frequent occurrence of vibration and measurement error in the prior art.

5 and 6 illustrate an embodiment in which the cut-out portion 26 and the inverted curved portion 27 are applied so that the deformation and the shrinking elasticity of the annular elastic plate 20 can be performed more agile and precisely, As shown in the figure, the arc-shaped portion 21 of the annular elastic plate 20 is provided with a cut-out portion 26 cut in a direction parallel to the detection rod 12 of the displacement gauge 10, And a reverse curved portion 27 curved in a direction opposite to the arcuate curved portion 21 is formed so that a plurality of elastic curved plates divided on both sides of the annular elastic plate 20 are formed.

That is, a plurality of cut-out portions 26 are formed in a direction parallel to the detection rods 12 of the displacement gauge 10, which is perpendicular to both arc-shaped curved portions 21 of the annular elastic plate 20, The arcuate curved portion 21 cut by the formation of the incised portion 26 is bent in the reverse direction so that the vertical line connecting the upper end and the lower end of the incised portion 26 is symmetric with the arcuate curved portion 21 Thereby forming the inverted curved portion 27.

5 and 6, the arcuate arcuate curved portion 21 and the inverted curved portion 27 are symmetrical about the vertical line connecting the upper end and the lower end of the cutout portion 26, as described above, It is possible to effectively prevent the interference between the arcuate curved portion 21 and the reverse curved portion 27 that can be caused in the restoration by the curvature deformation or the elastic force due to the external force within the limited width and space of the annular elastic plate 29.

As described above, by forming a plurality of arcuate curved portions 21 and reverse curved portions 27, which are in a state of reduced width on both sides of the annular resilient plate 20, the annular resilient plate 20 composed of a single plate can be applied, It is possible to perform a one-step astute behavior even in the case of restoration by shrinkage elasticity as well as the strain caused by the shrinkage elasticity, thereby enabling highly sensitive strain measurement with improved precision and responsiveness.

10: Displacement meter
11: Body
12: Detection rod
13: Body fixture
14: Detecting Bongo junggu
15: coil spring
18: Weight
19: Connecting cable
20: annular elastic plate
21:
22:
23:
24: Fixing tube
26: incision
27:
30:
31: Type pin
32: Retractable device
98: hypothetical holding
99: Measuring structure

Claims (2)

1. A structure displacement measuring apparatus incorporating a displacement gauge (10) constituted by a main body (11) and a detection rod (12)
A displacement gauge 10 is provided inside the annular elastic plate 20 in which arc-shaped curved portions 21 bent in an arc shape are formed on both sides and upper and lower plates 22 and 23 are formed on the upper and lower ends, Is installed;
The lower portion of the main body 11 of the displacement meter 10 is fixed to the upper surface of the lower plate portion 23 of the annular elastic plate 20;
The upper portion of the detection rod 12 of the displacement meter 10 is fixed to the bottom surface of the upper plate portion 22 of the annular elastic plate 20;
The bottom surface of the lower plate portion 23 is fixed to the bottom surface of the detection structure 99;
The upper surface of the upper plate portion 22 is bound to the detection structure 99 and the connecting line 19 so that the shrinking elastic force in the direction in which the upper plate portion 22 and the lower plate portion 23 of the annular elastic plate 20 are close to each other, (10) and the detection rod (12). The apparatus for measuring a structure displacement using an annular elastic plate according to claim 1,
The cutting tool according to claim 1, wherein a cut-out portion (26) cut in a direction parallel to the detection rod (12) of the displacement gauge (10)
Wherein the incision part (26) is formed with an inverted curved part (27) curved in a direction opposite to the arcuate curved part (21).
KR1020160019410A 2016-02-18 2016-02-18 Displacement measuring apparatus using ring type elastic plate KR101615097B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101848714B1 (en) 2016-04-08 2018-04-13 백양엔지니어링 주식회사 Displacement measuring apparatus using curved elastic plate
KR101947031B1 (en) * 2018-05-16 2019-05-02 주식회사 대성건설이엔지 Apparatus for measuring deflection of bridge using ring type displacement transducer
KR101947022B1 (en) * 2018-05-16 2019-05-02 주식회사 대경유지 Apparatus for measuring deflection of bridge using string tension control means

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100857162B1 (en) 2008-05-23 2008-09-05 주식회사 신영이엔씨 Measure apparatus for safety check-up of bridge

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100857162B1 (en) 2008-05-23 2008-09-05 주식회사 신영이엔씨 Measure apparatus for safety check-up of bridge

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101848714B1 (en) 2016-04-08 2018-04-13 백양엔지니어링 주식회사 Displacement measuring apparatus using curved elastic plate
KR101947031B1 (en) * 2018-05-16 2019-05-02 주식회사 대성건설이엔지 Apparatus for measuring deflection of bridge using ring type displacement transducer
KR101947022B1 (en) * 2018-05-16 2019-05-02 주식회사 대경유지 Apparatus for measuring deflection of bridge using string tension control means

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