KR100734004B1 - Jig for gripping a measuring instrument of displacement - Google Patents

Jig for gripping a measuring instrument of displacement Download PDF

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Publication number
KR100734004B1
KR100734004B1 KR1020050129148A KR20050129148A KR100734004B1 KR 100734004 B1 KR100734004 B1 KR 100734004B1 KR 1020050129148 A KR1020050129148 A KR 1020050129148A KR 20050129148 A KR20050129148 A KR 20050129148A KR 100734004 B1 KR100734004 B1 KR 100734004B1
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KR
South Korea
Prior art keywords
displacement
support shaft
jig
support rod
measuring
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KR1020050129148A
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Korean (ko)
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KR20070067569A (en
Inventor
나성훈
권성태
서정원
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한국철도기술연구원
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Priority to KR1020050129148A priority Critical patent/KR100734004B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/30—Supports specially adapted for an instrument; Supports specially adapted for a set of instruments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61K—AUXILIARY EQUIPMENT SPECIALLY ADAPTED FOR RAILWAYS, NOT OTHERWISE PROVIDED FOR
    • B61K9/00—Railway vehicle profile gauges; Detecting or indicating overheating of components; Apparatus on locomotives or cars to indicate bad track sections; General design of track recording vehicles
    • B61K9/08—Measuring installations for surveying permanent way
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/0002—Arrangements for supporting, fixing or guiding the measuring instrument or the object to be measured
    • G01B5/0004—Supports
    • 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

Abstract

본 발명은 철도차량의 하중에 큰 영향을 받지 않는 지반에 매설할 수 있는 지지축에 침목이나 레일의 변위를 계측하는 변위계를 안정적으로 고정 결합시킬 수 있도록 하는 변위계 고정 지그에 관한 것으로서, 침목 또는 레일의 변위를 측정하는 변위계를 고정하기 위한 지그에 있어서, 지반에 매설되는 지지축; 및 상기 지지축의 상부에 고정 지지되는 지그 몸체;로 구성되어, 철도차량의 하중에 큰 영향을 받지 않는 지반에 매설할 수 있는 지지축에 침목이나 레일의 변위를 계측하는 변위측정장치를 안정적으로 고정 결합시킬 수 있도록 하는 효과가 있다. The present invention relates to a displacement gauge fixing jig for stably fixing a displacement gauge for measuring the displacement of a sleeper or a rail to a support shaft that can be buried in a ground that is not significantly affected by the load of a railway vehicle. A jig for fixing a displacement meter for measuring the displacement of the support shaft, buried in the ground; And a jig body fixedly supported at an upper portion of the support shaft, and stably fixing a displacement measuring device for measuring a displacement of a sleeper or a rail on a support shaft that can be embedded in the ground that is not significantly affected by the load of the railway vehicle. It has the effect of being able to combine.

변위, 침목변위, 레일변위, 변위계 Displacement, sleeper displacement, rail displacement, displacement meter

Description

변위계 고정 지그 {Jig for gripping a measuring instrument of displacement}Jig for gripping a measuring instrument of displacement}

도 1은 본 발명에 따른 변위계 고정 지그를 사용하여 변위측정장치를 선로에 설치한 상태도.1 is a state in which the displacement measuring device is installed on the track using a displacement gauge fixing jig according to the present invention.

도 2는 도 1에 도시한 변위계 고정 지그를 사용하는 변위측정장치의 구성도.2 is a configuration diagram of a displacement measuring device using the displacement gauge fixing jig shown in FIG.

도 3a 내지 도 3c는 도 1에 도시한 변위계 고정 지그의 평면도, 정면도, 저면도.3A to 3C are a plan view, a front view, and a bottom view of the displacement gauge fixing jig shown in FIG. 1.

도 4는 본 발명에 따른 변위계 고정 지그를 선로에 설치한 사진.Figure 4 is a photograph of the displacement meter fixing jig according to the present invention installed on the track.

* 도면의 주요 부분에 대한 간단한 설명* Brief description of the main parts of the drawing

1.. 레일 2.. 침목1 .. Rail 2 .. Sleepers

10.. 지그 몸체 11a, 11b.. 지지봉 고정구10 .. Jig body 11a, 11b .. Support rod fixture

12a, 12b, 12c.. 지지봉 삽입공 13.. 변위계 고정 지그12a, 12b, 12c .. Supporting rod insertion hole 13. Displacement fixing jig

14.. 제 1지지봉 15.. 제 2지지봉14 .. First support rod 15 .. Second support rod

16.. 제 1개폐 나사부 17.. 제 1결합구16 .. First opening and closing thread 17 .. First coupling hole

18.. 제 2개폐 나사부 19.. 제 3결합구18 .. 2nd opening and closing thread 19 .. 3rd coupling

20.. 변위계 21.. 변위 계측핀20. Displacement meter 21. Displacement measuring pin

22.. 제 2결합구 23.. 지지축22 .. Second Combination 23 .. Support Shaft

24.. 지지축 삽입공24 .. Support shaft insertion hole

30.. 변위측정장치30. Displacement measuring device

본 발명은 변위계 고정 지그에 관한 것으로서, 보다 상세하게는 선로에 설치되어 레일이나 침목의 변위를 측정하는 변위계를 고정시키기 위한 변위계 고정 지그에 관한 것이다.The present invention relates to a displacement gauge fixing jig, and more particularly, to a displacement gauge fixing jig for fixing a displacement gauge installed on a track to measure the displacement of a rail or a sleeper.

철도차량은 매우 무거운 자중을 가지고 있고, 고속으로 주행하기 때문에 철도차량을 지탱하게 되는 선로는 매우 안정적인 지반위에 침목과 레일이 부설되어 이루어진다. Railroad cars have a very heavy weight, and because they run at high speed, the tracks supporting railroad cars are made of sleepers and rails on a very stable ground.

이러한 침목이나 레일은 철도차량이 선로위를 주행할 때 철도차량으로부터 가해지는 하중에 의하여 외부 변형을 일으키게 되는데, 이는 궤도틀림의 원인이 되어 안전운행에 막대한 지장을 줄 수 있으므로 침목이나 레일의 변위를 정확하게 계측하는 것이 매우 중요하다. These sleepers or rails cause an external deformation due to the load applied by the railway vehicle when the railway vehicle travels on the track, which may cause distortion of the track and cause significant obstacles to safe operation. Accurate measurement is very important.

그런데, 종래의 변위계는 변위를 계측하고자 하는 대상물, 즉 침목이나 레일 위에 직접 설치하여 사용하도록 되어 있기 때문에 철도차량으로부터 가해지는 하중에 의하여 변위계까지 영향을 받게 되므로 정확하게 침목이나 레일의 변위를 계측 하는 것이 어렵다는 문제점이 있었다. However, the conventional displacement meter is directly installed on the object to be measured, that is, on the sleeper or rail, so that the displacement meter is affected by the load from the railroad car. There was a difficult problem.

본 발명은 전술한 문제점을 해결하기 위하여 안출된 것으로서, 철도차량의 하중에 큰 영향을 받지 않는 지반에 매설할 수 있는 지지축에 침목이나 레일의 변위를 계측하는 변위계를 안정적으로 고정 결합시킬 수 있도록 하는 변위계 고정 지그를 제공함에 그 목적이 있다. The present invention has been made to solve the above-described problems, so that the displacement gauge for measuring the displacement of the sleepers or rails can be stably fixed to the support shaft that can be embedded in the ground is not significantly affected by the load of the railway vehicle The object is to provide a displacement gauge fixing jig.

전술한 목적을 달성하기 위한 본 발명에 따른 변위계 고정 지그는, 침목 또는 레일의 변위를 측정하는 변위계를 고정하기 위한 지그에 있어서, 지반에 매설되는 지지축; 및 상기 지지축의 상부에 고정 지지되는 지그 몸체;로 구성된 것을 특징으로 한다.Displacement meter fixing jig according to the present invention for achieving the above object, the jig for fixing the displacement meter for measuring the displacement of the sleepers or rails, the support shaft embedded in the ground; And a jig body fixedly supported on an upper portion of the support shaft.

상기 몸체는, 상기 지지축에 삽입되는 지지축 삽입공과 변위계를 지지하기 위한 제 1지지봉이 삽입 체결되는 지지봉 체결공이 형성된 것을 특징으로 한다.The body is characterized in that the support rod fastening hole is inserted into the support shaft insertion hole is inserted into the support shaft and the first support rod for supporting the displacement gauge is formed.

상기 지지봉 체결공은 상하, 좌우, 전후로 관통 형성된 것을 특징으로 한다.The support rod fastening hole is characterized in that the penetrating is formed up and down, left and right, front and rear.

상기 지지축 삽입공에 결합된 지지축은 지지축 고정구에 의해 고정되는 것을 특징으로 한다.The support shaft coupled to the support shaft insertion hole is fixed by a support shaft fixture.

상기 지지축은 환봉인 것을 특징으로 한다.The support shaft is characterized in that the round bar.

이하에서는 첨부된 도면을 참조하여 본 발명에 따른 변위계 고정 지그에 대해서 상세하게 설명한다.Hereinafter, a displacement gauge fixing jig according to the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 변위계 고정 지그를 사용하여 종래에 일반적으로 사용되던 변위측정장치를 실제로 선로에 설치한 상태도이고, 도 2는 도 1에 도시한 변위계 고정 지그를 사용하는 변위측정장치의 상세 구성도이며, 도 3a 내지 도 3c는 도 1에 도시한 변위계 고정 지그의 평면도와 정면도 및 저면도이고, 도 4는 본 발명에 따른 변위계 고정 지그를 선로에 설치한 사진이다.FIG. 1 is a state diagram in which a displacement measuring device, which is generally used in the related art, is actually installed on a line using a displacement gauge fixing jig according to the present invention, and FIG. 2 is a detail of a displacement measuring device using the displacement gauge fixing jig shown in FIG. 3A to 3C are a plan view, a front view and a bottom view of the displacement gauge fixing jig shown in FIG. 1, and FIG. 4 is a photograph in which the displacement gauge fixing jig according to the present invention is installed on a line.

먼저, 침목 또는 레일의 변위를 측정하는 변위측정장치(30)에 대해서 간략하게 설명한다.First, the displacement measuring device 30 for measuring the displacement of the sleepers or rails will be briefly described.

상기한 변위측정장치(30)는 침목 또는 레일의 목적점에 설치되는 변위계(20)를 구비하는데, 이 변위계(20)는 일측에 침목 또는 레일의 변위량에 따라 왕복 이동하는 변위 계측핀(23)이 돌출 형성되고, 타측에 상기 변위 계측핀(23)에 의하여 계측된 변위량을 신호처리장치(미도시)로 전송하기 위한 전송 케이블이 설치되게 된다. 상기 신호처리장치는 변위계(20)로부터 입력되는 변위량을 연산한 후 소정의 포맷으로 변환하여 저장하거나 표시하여 주게 된다. The displacement measuring device 30 is provided with a displacement gauge 20 is installed on the target point of the sleeper or rail, the displacement meter 20 is a displacement measuring pin 23 reciprocating in accordance with the displacement amount of the sleeper or rail on one side The protrusion is formed, and on the other side, a transmission cable for transmitting the displacement measured by the displacement measuring pin 23 to a signal processing device (not shown) is installed. The signal processing apparatus calculates the amount of displacement input from the displacement meter 20, converts it into a predetermined format, and stores or displays it.

그리고, 상기 변위계(20)는 제 3결합구(19)를 통해 제 2지지봉(15)에 결합되게 되고, 상기 제 2지지봉(15)은 제 2결합구(22)와 제 1결합구(17)를 통해 제 1지지봉(14)에 결합되게 되며, 상기 제 1지지봉(14)은 변위계 고정 지그(13)에 나사 체결되어 고정되게 된다.In addition, the displacement meter 20 is coupled to the second support rod 15 through the third coupler 19, the second support rod 15 is the second coupler 22 and the first coupler 17 It is coupled to the first support rod 14 through), the first support rod 14 is screwed to the displacement gauge fixing jig 13 to be fixed.

상기한 제 3결합구(19)는 제 2개폐 나사부(18)에 의해 상기 제 2지지봉(15)에 대한 파지력이 가변되는 것으로서, 상기 제 2개폐 나사부(18)를 일측으로 돌리 면 제 2지지봉(15)에 대한 파지력이 약화되어 제 2지지봉(15)이 제 3결합구(19)의 내측에 형성된 통과공(미도시)를 따라 자유롭게 이동가능하게 되고, 제 2개폐 나사부(18)를 타측으로 돌리면 제 2지지봉(15)에 대한 파지력이 강화되어 제 2지지봉(15)에 고정되게 된다.The third coupler 19 has a holding force with respect to the second supporting rod 15 by the second opening / closing screw portion 18, and the second supporting rod is turned when the second opening / closing screw portion 18 is turned to one side. The holding force with respect to (15) is weakened so that the second support rod 15 can move freely along a through hole (not shown) formed inside the third coupling hole 19, and the second opening and closing screw portion 18 When turned to the side, the holding force for the second support rod 15 is strengthened to be fixed to the second support rod 15.

상기 제 2결합구(22)와 제 1결합구(17)는 제 1개폐 나사부(16)에 의해 상기 제 2지지봉(15)과 제 1지지봉(14)에 대한 파지력이 가변되는 것으로서, 상기 제 1개폐 나사부(16)를 일측으로 돌리면 제 2결합구(22)는 제 2지지봉(15)에 대한 파지력이 약화되게 되고, 제 1결합구(17)는 제 1지지봉(14)에 대한 파지력이 약화되게 되며, 상기 제 1개폐 나사부(16)를 타측으로 돌리게 되면 제 2결합구(22)는 제 2지지봉(15)에 대한 파지력이 강화되게 되고, 제 1결합구(17)는 제 1지지봉(14)에 대한 파지력이 강화되게 된다.The second coupler 22 and the first coupler 17 have a gripping force with respect to the second support rod 15 and the first support rod 14 by the first opening / closing screw portion 16. When the first opening and closing screw portion 16 is turned to one side, the second coupling hole 22 weakens the holding force with respect to the second supporting rod 15, and the first coupling hole 17 has a holding force with respect to the first supporting rod 14. When the first opening and closing screw portion 16 is turned to the other side, the second coupling hole 22 is weakened to hold the second supporting rod 15, and the first coupling hole 17 is the first supporting rod. The holding power for (14) is strengthened.

전술한 바와 같이 구성되는 변위측정장치(30)는 제 1결합구 내지 제 3결합구(17, 22, 19)에 대한 파지력을 조절하는 제 1개폐 나사부(16)와 제 2개폐 나사부(18)에 조절하여 제 1지지봉(14)과 제 2지지봉(15)을 자유롭게 이동시킬 수 있도록 되어 있어 원하는 지점의 변위를 측정할 수 있게 된다.Displacement measuring device 30 configured as described above is the first opening and closing screw portion 16 and the second opening and closing screw portion 18 to adjust the holding force for the first to third coupling spheres (17, 22, 19) The first support rod 14 and the second support rod 15 can be freely moved by adjusting to so that the displacement of the desired point can be measured.

전술한 바와 같은 변위측정장치(30)를 고정 지지하는 본 발명에 따른 변위계 고정 지그(13)는, 침목 또는 레일의 변위를 측정하기 위한 변위측정장치(30)를 견고하게 고정하기 위하여 사용되게 되는 것으로서, 도 4에 나타낸 사진과 같이 선로에 설치되게 된다.The displacement meter fixing jig 13 according to the present invention for holding and supporting the displacement measuring device 30 as described above is to be used to firmly fix the displacement measuring device 30 for measuring the displacement of the sleeper or the rail. As a result, it is installed on the track as shown in the photograph shown in FIG.

상기 변위계 고정 지그(13)는, 지지축(23)과 지그 몸체(10) 그리고 지지축 고정구(11a, 11b)를 구비하여 이루어진다. The displacement gauge fixing jig 13 includes a supporting shaft 23, a jig body 10, and supporting shaft fixing tools 11a and 11b.

상기한 지지축(23)은 하부가 지반에 매설되고 상부가 지그 몸체(10)에 형성된 지지축 삽입공(24)에 삽입 고정되게 된다.The support shaft 23 is embedded in the support shaft insertion hole 24 formed in the jig body 10 and the lower portion is embedded in the ground.

상기한 지그 몸체(10)는 사각체 형상으로서, 상기 지지축(23)이 관통 삽입되는 지지축 삽입공(24)이 형성되고, 변위측정장치(30)를 지지하기 위한 제 1지지봉(14)이 삽입 체결되는 지지봉 체결공(12a, 12b, 12c)이 형성되며, 상기 지지축 고정구(11a, 11b)가 삽입되어 각각 나사 체결되기 위한 고정구 체결홀(11c, 11d)이 형성되게 된다.The jig body 10 has a quadrangular shape, and a support shaft insertion hole 24 through which the support shaft 23 is inserted is formed, and the first support rod 14 for supporting the displacement measuring device 30. Support rod fastening holes (12a, 12b, 12c) to be inserted is formed, and the support shaft fasteners (11a, 11b) are inserted to form fastener fastening holes (11c, 11d) for screwing, respectively.

여기서 상기한 지지봉 체결공(12a, 12b, 12c)은 상하, 좌우, 전후로 관통 형성되게 되는데, 시험자는 측정하고자 하는 침목 또는 레일 위의 목적지점에 따라 제 1지지봉(14)을 지그 몸체(10)의 지지봉 체결공(12a, 12b, 12c) 중에서 선택하여 체결 위치를 변경하면서 계측을 수행할 수 있게 된다.Wherein the support rod fastening holes (12a, 12b, 12c) is formed to penetrate up, down, left and right, back and forth, the tester according to the target point on the sleeper or rail to measure the jig body (10) By selecting from the support rod fastening holes (12a, 12b, 12c) it is possible to perform the measurement while changing the fastening position.

상기한 지지봉 체결공(12a, 12b, 12c)은 암나사를 형성하고, 상기 제 1지지봉(14)은 수나사를 형성하여 상호 나사 체결됨으로써 고정 결합되게 된다.The support rod fastening holes 12a, 12b, and 12c form female threads, and the first support rods 14 are fixed by being screwed together to form male threads.

상기한 지지축 고정구(11a, 11b)는 한 쌍으로 이루어져, 지그 몸체(10)에 삽입되는 지지축(23)을 고정시키게 된다. 상기 지그 몸체(10)에 형성된 고정구 체결홀(11c, 11d)은 암나사가 형성되어 있고, 상기 지지축 고정구(11a, 11b)는 수나사가 형성되어 상호 나사 체결됨으로써 지지축 고정구(11a, 11b)가 지그 몸체(10)에 고정 결합되게 된다. The support shaft fixtures 11a and 11b are formed in pairs to fix the support shaft 23 inserted into the jig body 10. The fastener fastening holes 11c and 11d formed in the jig body 10 are formed with female threads, and the support shaft fasteners 11a and 11b have male threads formed therein so that the support shaft fasteners 11a and 11b are screwed together. The jig body 10 is to be fixedly coupled.

전술한 바와 같은 본 발명에 따른 변위계 고정 지그는 지반에 견고하게 매몰 되어 고정되는 지지축(23)에 고정됨으로써 침목 또는 레일의 변위를 정확하게 측정할 수 있게 된다.The displacement meter fixing jig according to the present invention as described above is fixed to the support shaft 23 is firmly embedded and fixed to the ground, it is possible to accurately measure the displacement of the sleepers or rails.

전술한 실시예는 본 발명의 가장 바람직한 예에 관한 것으로서, 본 발명은 상기 실시예에 한정되지 않고, 그 기술적 사상을 벗어나지 않는 범위 내에서 다양한 변형이 가능하다.The above embodiment relates to the most preferred embodiment of the present invention, the present invention is not limited to the above embodiment, various modifications are possible within the scope without departing from the spirit.

본 발명에 따른 변위계 고정 지그는, 철도차량의 하중에 큰 영향을 받지 않는 지반에 매설할 수 있는 지지축에 침목이나 레일의 변위를 계측하는 변위측정장치를 안정적으로 고정 결합시킬 수 있도록 하는 효과가 있다. The displacement gauge fixing jig according to the present invention has an effect of stably coupling a displacement measuring device for measuring displacement of sleepers or rails to a support shaft that can be buried in the ground that is not significantly affected by the load of a railway vehicle. have.

또한, 본 발명은 침목이나 레일의 변위를 정확히 계측함으로써 선로의 변위를 안정적으로 관리할 수 있게 되어 열차의 안정운행을 도모할 수 있도록 하는 효과가 있다.In addition, the present invention is able to stably manage the displacement of the track by accurately measuring the displacement of the sleepers or rails, it is effective to enable the stable operation of the train.

Claims (5)

침목 또는 레일의 변위를 측정하는 변위계를 고정하기 위한 지그에 있어서,In the jig for fixing the displacement meter for measuring the displacement of the sleepers or rails, 지반에 매설되는 지지축; 및Support shaft embedded in the ground; And 상기 지지축에 삽입되는 지지축 삽입공과 변위계를 지지하기 위한 제 1지지봉이 삽입 체결되는 상하, 좌우, 전후로 관통 형성된 지지봉 체결공이 형성되어 상기 지지축의 상부에 고정 지지되는 지그 몸체;로 구성된 것을 특징으로 하는 변위계 고정 지그.A jig body having a support rod fastening hole formed through the top, bottom, left, and right sides to which the support shaft insertion hole inserted into the support shaft and the first support rod for supporting the displacement gauge are inserted and fastened is formed and fixedly supported on the upper portion of the support shaft; Displacement gauge fixed jig. 삭제delete 삭제delete 제 1항에 있어서,The method of claim 1, 상기 지지축 삽입공에 결합된 지지축은 지지축 고정구에 의해 고정되는 것을 특징으로 하는 변위계 고정 지그.And a support shaft coupled to the support shaft insertion hole is fixed by a support shaft fixture. 제 4항에 있어서,The method of claim 4, wherein 상기 지지축은 환봉인 것을 특징으로 하는 변위계 고정 지그.The support shaft is a displacement gauge fixing jig, characterized in that the round bar.
KR1020050129148A 2005-12-24 2005-12-24 Jig for gripping a measuring instrument of displacement KR100734004B1 (en)

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KR100950324B1 (en) 2009-07-29 2010-03-31 서울메트로 New construction joint dvice displacement detection system of railway rail
KR101376745B1 (en) * 2012-09-04 2014-03-21 한국철도기술연구원 Apparatus for measuring ground settlement of ballastless track, and constructing method for the same

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KR100899539B1 (en) * 2007-12-14 2009-05-27 한국철도기술연구원 Frame for setting measurement unit of high speed railway system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100950324B1 (en) 2009-07-29 2010-03-31 서울메트로 New construction joint dvice displacement detection system of railway rail
KR101376745B1 (en) * 2012-09-04 2014-03-21 한국철도기술연구원 Apparatus for measuring ground settlement of ballastless track, and constructing method for the same

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