JP3568471B2

JP3568471B2 - Vertical displacement difference measuring device between two points

Info

Publication number: JP3568471B2
Application number: JP2000309398A
Authority: JP
Inventors: 万寿男門; 知也山下
Original assignee: JGC Corp
Current assignee: JGC Corp
Priority date: 2000-10-10
Filing date: 2000-10-10
Publication date: 2004-09-22
Anticipated expiration: 2020-10-10
Also published as: JP2002116009A

Description

【０００１】
【発明の属する技術分野】
本発明は、水平方向に離間した２点の鉛直方向の変位の差を測定する装置に関する。
【０００２】
【従来の技術】
多くの部位が水平方向に大きく離間して配置されている巨大構造物の場合に、例えば、不均等な地盤沈下等によって、各部位が初期の据え付け高さ位置に対して異なる変位をすると、各部位間を連結する部材に過大な応力が作用して亀裂が入ったり、それが原因となって事故が発生したりすることがある。そこで、このような変位の差を経時的に監視することが必要である。それに対して従来は、例えば、水管式や差圧式の変位計が利用されてきた。
【０００３】
【発明が解決しようとする課題】
しかしながら、これらの変位計は基準点と測定点の間に水管を通して配置することが必要であり、両点の水位の差を計測することから自動計測は難しく、長期間連続的な監視を行うには適していない。
本発明は、上記問題に鑑み、水平方向に離間した２点間の鉛直方向の変位の差を連続的に監視できる監視装置を提供することを目的とする。
【０００４】
【課題を解決するための手段】
請求項１の発明によれば、水平方向に離間した２点の鉛直方向の変位の差を測定する２点間鉛直変位差測定装置であって、
互いにヒンジ結合され第１の点と第２の点の間に配設された複数の水平方向に延伸する水平梁と、
各ヒンジ部の両側の隣り合う水平梁の各端部に配設される一対の互いに略平行に略鉛直方向に延伸する一対の鉛直梁と、
該一対の鉛直梁に異なる２つの高さで略水平方向に架橋配置される一対の光ファイバーセンサーと、
該一対の光ファイバーセンサーの内の、一方の光ファイバーセンサーの初期据え付け状態からの伸縮偏差と、他方の光ファイバーセンサーの初期据え付け状態からの伸縮偏差と、該一対の光ファイバーセンサーの高さの差から傾斜を算出し、該傾斜と水平梁の長さから各水平梁の第１の点側の端部に対する第２の点側の端部の鉛直方向の変位を算出し、各水平梁の鉛直方向の変位を合算して、第１の点に対する第２の点の鉛直変位の差を算出する演算手段と、
を具備することを特徴とする２点間鉛直変位差測定装置が提供される。
【０００５】
このように構成された鉛直変位測定装置では、第１の点と第２の点が互いにヒンジ結合された複数の略水平方向に延伸する水平梁で連結され、各ヒンジ部の両側の隣り合う水平梁の各端部に互いに略平行に略鉛直方向に延伸する一対の鉛直梁が立設され、該一対の鉛直梁に異なる２つの高さに一対の光ファイバーセンサーが略水平方向に架橋配置され、演算手段が該一対の光ファイバーセンサーの内の、一方の光ファイバーセンサーの初期据え付け状態からの伸縮偏差と、他方の光ファイバーセンサーの初期据え付け状態からの伸縮偏差と、該一対の光ファイバーセンサーの高さの差から傾斜を算出し、該傾斜と水平梁の長さから各水平梁の第１の点側の端部に対する第２の点側の端部の鉛直方向の変位を算出し、各水平梁の鉛直方向の変位を合算して、第１の点に対する第２の点の鉛直変位の差を算出する。
【０００６】
請求項２の発明によれば、請求項１の発明において、
水平梁の個数をｎ、
各水平梁のヒンジ間の長さをＬ_ｎ、
各一対の光ファイバーセンサーの上側のものが検出した伸縮変位をｄ_ｎ、
各一対の光ファイバーセンサーの下側のものが検出した伸縮変位をｅ_ｎ、
各一対の光ファイバーセンサーの高さの差をｈ、としたときに、
鉛直変位Ｓ_ｎを以下の式でもとめるようにした２点間鉛直変位差測定装置が提供される、

【０００７】
請求項３の発明によれば、請求項１の発明において、演算手段の演算したデータを送信する送信手段と、
送信手段の送信したデータを遠隔地で受信して記録する監視装置を含む２点間鉛直変位差測定装置が提供される。
このように構成された装置によれば、２点間鉛直変位差を遠隔地で監視できる。
【０００８】
【発明の実施の形態】
以下、添付の図面を参照して本発明の実施の形態を説明する。
第１架台１０と第２架台２０が離間配置され、その間には中間架台３０が配設されている。第１架台１０の上には第１構造物１１が固定され、第２架台２０の上には第２構造物２１が固定されている。第１架台１０、第２架台２０には、それぞれ、ブラケット１２、２２を介して、第１蝶番部材４１、第２蝶番部材４２の図示しない２つの可動片の１つが取り付けられている。中間架台３０にはブラケット３２を介して第３蝶番部材４３の図示しない３つの可動片の１つが取り付けられている。
【０００９】
第１水平梁１１０の右端が補助部材１１１を介して第１蝶番部材４１の他方の可動片に取り付けられており、第１水平梁１１０の左端が補助部材１１２を介して第３蝶番部材４３の１つの可動片に取り付けられている。同様に、第２水平梁１２０の右端が補助部材１２１を介して第３蝶番部材４３の１つの可動片に取り付けられており、第２水平梁１２０の左端が補助部材１２２を介して第２蝶番部材４２の他方の可動片に取り付けられている。
また、第１鉛直梁２１０がブラケット１２の上面に、第２鉛直梁２２０が第１水平梁１１０の右端の上面に、第３鉛直梁２３０が第１水平梁１１０の左端の上面に、第４鉛直梁２４０が第２水平梁１２０の右端の上面に立設されている。
【００１０】
そして、第１鉛直梁２１０と第２鉛直梁２２０の上部の間に第１上側光ファイバーセンサー３１１が架橋配置され、ブラケット１２と第１水平梁１１０の右端の間に第１下側光ファイバーセンサー３１２が架橋配置されており、また、第３鉛直梁２３０と第４鉛直梁２４０の上部の間に第２上側光ファイバーセンサー３２１が架橋配置され、第１水平梁１１０の左端と第２水平梁１２０の右端の間に第２下側光ファイバーセンサー３２２が架橋配置されている。
【００１１】
各光ファイバーセンサーの入射端部には光入射ケーブルを介して測定ユニット４００の発光器（図示せず）の発光した光が入射され、出射者端部から再び測定ユニット４００の受光器（図示せず）に戻るようにされている。測定ユニット４００の演算器４１０は入射光強度に対する出射光強度の比、すなわち、減衰比から各光ファイバーセンサーは両端の取り付け点間の初期据え付け状態からの伸縮を演算する。演算結果は、測定ユニット内の送信器４２０から遠隔配置された監視センタ５００の受信器５１０へ、電話回線等の通信手段によって送られ、監視センタ５００内の記録器５２０に記録される。
なお、図１において光入射ケーブルと光出射ケーブルはまとめて参照符号３５０で示されている。
【００１２】
以下、図２を参照して第１構造物１１と第２構造物２１の、鉛直変位の測定の原理について説明する。
図２において、Ｐ_０は第１蝶番部材４１の回転軸中心であり、Ｐ_１は第３蝶番部材４３の回転軸中心であり、Ｐ_２は第２蝶番部材４２の回転軸中心である。
点Ｐ_１の点Ｐ_０に対する鉛直方向の変位Ｓ_１は据え付け時のＰ_０とＰ_１の距離をＬ_１、変位後のＰ_０とＰ_１を結ぶ直線の水平線に対する傾きをθ_１とすると近似的にはＳ_１＝Ｌ_１×ｔａｎθ_１である。
【００１３】
前記θ_１は第１鉛直梁２１０と第２鉛直梁２２０の挟む角度をθ_１’に等しい。ここで、第１上側光ファイバーセンサー３１１の伸びと第１下側光ファイバーセンサー３１２の伸びの差をΔ_１とし、第１上側光ファイバーセンサー３１１と第１下側光ファイバーセンサー３１２の高さ方向の差をｈとすると、近似的にはｔａｎθ_１’＝Δ_１／ｈである。そして、上側光ファイバーセンサー３１１の変位をｄ_１，第１下側光ファイバーセンサー３１２の変位をｅ_１とすると、Δ_１＝ｄ_１−ｅ_１である。
したがって、ｔａｎθ_１＝ｔａｎθ_１’＝（ｄ_１−ｅ_１）／ｈであり、
Ｓ_１＝Ｌ_１×｛（ｄ_１−ｅ_１）／ｈ｝である。
以上が、Ｐ０に対するＰ１の鉛直方向の変位差を求める方法である。
【００１４】
上記の方法にならい、以下、最終目的である、Ｐ_０に対するＰ_２の鉛直方向の変位差をもとめる。
点Ｐ_２の点Ｐ_０に対する鉛直方向の変位Ｓ_２は、Ｐ_２とＰ_１の距離をＬ_２とした時に、Ｌ_１＋Ｌ_２が水平に対してθ_１で傾いたことによる変位Ｓ_０２と、Ｌ_２がＬ_１＋Ｌ_２に対してθ_２で傾いたことによる変位Ｓ_１２の和である。
Ｓ_０２＝（Ｌ_１＋Ｌ_２）×｛（ｄ_１−ｅ_１）／ｈ｝である。
また、Ｓ_１２＝Ｌ_２×ｔａｎθ_２であって、θ_２はθ_１をもとめたのと同様にして、（ｄ_２−ｅ_２）／ｈとあらわすことができるので、
Ｓ_１２＝Ｌ_２×（ｄ_２−ｅ_２）／ｈである。
したがって、Ｓ_２＝Ｓ_０２＋Ｓ_１２＝（Ｌ_１＋Ｌ_２）×｛（ｄ_１−ｅ_１）／ｈ｝＋Ｌ_２×（ｄ_２−ｅ_２）／ｈ
である。
【００１５】
上記においてＬ_ｌとＬ_２は既知の値であり、ｈの値も既知である。また、Ｐ_１点の第１構造物１１の基準高さ位置、例えば、第１架台１０の上面の高さ位置に対する高さの差も既知であり、各光ファイバーセンサーの検出した変位から第１構造物１１に対する第２構造物２１の鉛直変位を求めることが可能である。
【００１６】
同様にして、水平梁がｎ個の場合の鉛直変位Ｓ_ｎは、以下のようにあらわすことができる。

【００１７】
【発明の効果】
各請求項に記載の発明は、水平方向に離間した２点の鉛直方向の変位の差を測定する２点間鉛直変位差測定装置であるが、互いにヒンジ結合され第１の点と第２の点の間に配設された複数の水平方向に延伸する水平梁と、各ヒンジ部の両側の隣り合う水平梁の各端部に配設される一対の互いに略平行に略鉛直方向に延伸する一対の鉛直梁と、該一対の鉛直梁に異なる２つの高さで略水平方向に架橋配置される一対の光ファイバーセンサーと、該一対の光ファイバーセンサーの内の、一方の光ファイバーセンサーの初期据え付け状態からの伸縮偏差と、他方の光ファイバーセンサーの初期据え付け状態からの伸縮偏差と、該一対の光ファイバーセンサーの高さの差から傾斜を算出し、該傾斜と水平梁の長さから各水平梁の第１の点側の端部に対する第２の点側の端部の鉛直方向の変位を算出し、各水平梁の鉛直方向の変位を合算して、第１の点に対する第２の点の鉛直変位の差を算出する演算手段と、を具備している。光ファイバーセンサーを使用しているので外部環境の影響を受けにくく長期にわたり安定して計測をおこなうことができる。また、中間のヒンジ結合点の変位をもとめることもできる。
特に、請求項３のように、演算手段の演算したデータを送信する送信手段と、送信手段の送信したデータを遠隔地で受信して記録する監視装置を備えれば、２点間鉛直変位差を遠隔地で監視できる。
【図面の簡単な説明】
【図１】本発明の実施の形態の構成を説明する図である。
【図２】本発明の鉛直変位差の演算方法を説明する図である。
【符号の説明】
１０…第１架台
１１…第１構造物
２０…第２架台
２１…第２構造物
３０…中間架台
４１、４２，４３…ヒンジ部材
１１０…第１水平梁
１２０…第２水平梁
２１０、２２０、２３０、２４０…第１、２、３、４鉛直梁
３１１…第１上側光ファイバーセンサー
３１２…第１下側光ファイバーセンサー
３２１…第２上側光ファイバーセンサー
３２２…第２下側光ファイバーセンサー
４００…測定ユニット[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus for measuring a difference between vertical displacements of two horizontally separated points.
[0002]
[Prior art]
In the case of a huge structure in which many parts are arranged largely apart in the horizontal direction, for example, if each part is displaced differently from the initial installation height position due to uneven land subsidence, etc. Excessive stress may act on the members connecting the parts, causing cracks, or accidents resulting from the cracks. Therefore, it is necessary to monitor such a difference in displacement over time. On the other hand, conventionally, for example, a displacement meter of a water tube type or a differential pressure type has been used.
[0003]
[Problems to be solved by the invention]
However, these displacement gauges need to be placed through a water pipe between the reference point and the measurement point, and measuring the difference in water level between the two points makes automatic measurement difficult. Is not suitable.
The present invention has been made in view of the above problems, and has as its object to provide a monitoring device that can continuously monitor a difference in vertical displacement between two horizontally separated points.
[0004]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a two-point vertical displacement difference measuring apparatus for measuring a difference in displacement in a vertical direction between two points separated in a horizontal direction,
A plurality of horizontally extending horizontal beams hinged to each other and disposed between the first point and the second point;
A pair of vertical beams extending in a substantially vertical direction substantially parallel to each other and disposed at each end of an adjacent horizontal beam on both sides of each hinge portion,
A pair of optical fiber sensors arranged in a substantially horizontal direction at two different heights on the pair of vertical beams,
Of the pair of optical fiber sensors, the inclination is calculated from the difference in expansion and contraction of one optical fiber sensor from the initial installation state, the expansion and contraction deviation of the other optical fiber sensor from the initial installation state, and the difference in height between the pair of optical fiber sensors. Calculating the vertical displacement of the second point end of the horizontal beam relative to the first point end of the horizontal beam from the inclination and the length of the horizontal beam, and calculating the vertical displacement of each horizontal beam. Computing means for calculating the difference between the first point and the vertical displacement of the second point with respect to the first point;
A vertical displacement difference measuring device between two points is provided.
[0005]
In the vertical displacement measuring device configured as described above, the first point and the second point are connected by a plurality of substantially horizontally extending horizontal beams hinged to each other, and the adjacent horizontal beams on both sides of each hinge portion are provided. At each end of the beam, a pair of vertical beams extending in a substantially vertical direction substantially in parallel to each other is erected, and a pair of optical fiber sensors are arranged in a substantially horizontal direction at two different heights on the pair of vertical beams, The calculating means calculates a difference between the expansion and contraction deviation of one of the pair of optical fiber sensors from the initial installation state, the expansion and contraction deviation of the other optical fiber sensor from the initial installation state, and the height of the pair of optical fiber sensors. Is calculated from the inclination and the length of the horizontal beam, and the vertical displacement of the second point side end of each horizontal beam with respect to the first point side end of each horizontal beam is calculated. Direction displacement Summed to, calculates the difference between the vertical displacement of the second point to the first point.
[0006]
According to the invention of claim 2, in the invention of claim 1,
The number of horizontal beams is n,
The length between the hinges of each horizontal beam is L _n ,
The telescopic displacement detected by the upper one of each pair of optical fiber sensors is d _n ,
The telescopic displacement ones underside of each pair of optical fiber sensor detects e _n,
When the height difference between each pair of optical fiber sensors is h,
Vertical displacement S _n or less between 2 and so finding an expression of point vertical displacement difference measuring device there is provided,

[0007]
According to a third aspect of the present invention, in the first aspect of the present invention, the transmitting means for transmitting the data calculated by the calculating means,
There is provided a two-point vertical displacement difference measuring device including a monitoring device for receiving and recording data transmitted by a transmitting means at a remote place.
According to the device configured as described above, the vertical displacement difference between two points can be monitored at a remote place.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
The first gantry 10 and the second gantry 20 are spaced apart, and an intermediate gantry 30 is arranged between them. A first structure 11 is fixed on the first gantry 10, and a second structure 21 is fixed on the second gantry 20. One of two movable pieces (not shown) of a first hinge member 41 and a second hinge member 42 is attached to the first frame 10 and the second frame 20 via

brackets

12 and 22, respectively. One of three movable pieces (not shown) of the third hinge member 43 is attached to the intermediate mount 30 via a bracket 32.
[0009]
The right end of the first horizontal beam 110 is attached to the other movable piece of the first hinge member 41 via the auxiliary member 111, and the left end of the first horizontal beam 110 is connected to the third hinge member 43 via the auxiliary member 112. It is attached to one movable piece. Similarly, the right end of the second horizontal beam 120 is attached to one movable piece of the third hinge member 43 via the auxiliary member 121, and the left end of the second horizontal beam 120 is connected to the second hinge via the auxiliary member 122. It is attached to the other movable piece of the member 42.
Further, the first vertical beam 210 is on the upper surface of the bracket 12, the second vertical beam 220 is on the upper surface of the right end of the first horizontal beam 110, the third vertical beam 230 is on the upper surface of the left end of the first horizontal beam 110, and the fourth A vertical beam 240 is erected on the upper surface of the right end of the second horizontal beam 120.
[0010]
A first upper optical fiber sensor 311 is bridged between the upper portions of the first vertical beam 210 and the second vertical beam 220, and a first lower optical fiber sensor 312 is provided between the bracket 12 and the right end of the first horizontal beam 110. A second upper optical fiber sensor 321 is bridged between the third vertical beam 230 and the fourth vertical beam 240, and the left end of the first horizontal beam 110 and the right end of the second horizontal beam 120. The second lower optical fiber sensor 322 is arranged in a bridge between them.
[0011]
The light emitted from the light emitting device (not shown) of the measuring unit 400 is incident on the incident end of each optical fiber sensor via a light incident cable, and the light receiving device (not shown) of the measuring unit 400 is again emitted from the end of the sender. ) Is to return to. The calculator 410 of the measuring unit 400 calculates the expansion and contraction from the initial installation state between the mounting points at both ends from the ratio of the output light intensity to the input light intensity, that is, the attenuation ratio. The calculation result is sent from the transmitter 420 in the measurement unit to the receiver 510 of the monitoring center 500 remotely located by a communication means such as a telephone line, and is recorded in the recorder 520 in the monitoring center 500.
In FIG. 1, the light input cable and the light output cable are collectively indicated by reference numeral 350.
[0012]
Hereinafter, the principle of measuring the vertical displacement of the first structure 11 and the second structure 21 will be described with reference to FIG.
In FIG. 2, P ₀ is the center of the rotation axis of the first hinge member 41, P ₁ is the center of the rotation axis of the third hinge member 43, and P ₂ is the center of the rotation axis of the second hinge member 42.
_{P 0} and _{L 1} the distance _{P 1} displacement _{S 1} in the vertical direction with respect to point _{P 0} of the time of installation points _{P 1,} approximated as the slope and theta ₁ with respect to the horizontal line of a straight line connecting _{P 0} and _{P 1} after displacement Specifically, S ₁ = L ₁ × tan θ ₁ .
[0013]
Θ ₁ is equal to θ ₁ ′, which is the angle between the first vertical beam 210 and the second vertical beam 220. Here, the difference between the elongation of the first upper optical fiber sensor 311 and elongation of the first lower optical fiber sensor 312 and delta _1, a first upper optical fiber sensor 311 the difference in height direction of the first lower optical fiber sensor 312 h Then, approximately, tan θ ₁ ′ = Δ ₁ / h. When the displacement of the upper optical fiber sensor 311 is d ₁ and the displacement of the first lower optical fiber sensor 312 is e ₁ , Δ ₁ = d ₁ −e ₁ .
Therefore, tan θ ₁ = tan θ ₁ ′ = (d ₁ −e ₁ ) / h, and
S ₁ = L ₁ × {(d ₁ −e ₁ ) / h}.
The above is the method of calculating the vertical displacement difference of P1 with respect to P0.
[0014]
Following the above method, the following is the final object, obtains the displacement difference in the vertical direction P ₂ relative to P _0.
Displacement _{S 2} in the vertical direction with respect to point _{P 0} of the point _{P 2} is the distance of _{P 2} and _{P 1} is taken as _{_{L _2,} L} 1 + _{L 2} is the displacement _{S 02} due to the inclined at theta ₁ with respect to the horizontal is the sum of the displacement _{S 12} due to _{the L 2} is inclined at theta ₂ with respect to _L 1 + _{L 2.}
S ₀₂ = (L ₁ + L ₂ ) × {(d ₁ −e ₁ ) / h}.
In addition, S ₁₂ = L ₂ × tan θ ₂ , and θ ₂ can be expressed as (d ₂ −e ₂ ) / h in the same manner as when θ ₁ is obtained.
S ₁₂ = L ₂ × (d ₂ −e ₂ ) / h.
Therefore, S ₂ = S ₀₂ + S ₁₂ = (L ₁ + L ₂ ) × {(d ₁ −e ₁ ) / h} + L ₂ × (d ₂ −e ₂ ) / h
It is.
[0015]
In the above, L ₁ and L ₂ are known values, and the value of h is also known. The reference height of the first structure 11 of the P ₁ point, for example, the difference in height to the height position of the upper surface of the first frame 10 is also known, the first structure from the detected displacement of each optical fiber sensor The vertical displacement of the second structure 21 with respect to the object 11 can be obtained.
[0016]
Similarly, the vertical displacements S _n where horizontal beams of n can be represented as follows.

[0017]
【The invention's effect】
The invention described in each claim is a two-point vertical displacement difference measuring device for measuring a difference in vertical displacement between two points horizontally separated from each other, wherein the first point and the second point are hinged to each other. A plurality of horizontally extending horizontal beams disposed between the points and a pair of substantially parallel mutually extending substantially vertical directions disposed at respective ends of adjacent horizontal beams on both sides of each hinge portion. A pair of vertical beams, a pair of optical fiber sensors arranged in a substantially horizontal direction at two different heights on the pair of vertical beams, and an initial installation state of one optical fiber sensor of the pair of optical fiber sensors. The inclination is calculated from the expansion / contraction deviation of the other optical fiber sensor from the initial installation state of the other optical fiber sensor and the height difference between the pair of optical fiber sensors, and the first inclination of each horizontal beam is calculated from the inclination and the length of the horizontal beam. To the end on the point side of Calculating means for calculating the vertical displacement of the end on the second point side, summing the vertical displacements of the horizontal beams, and calculating the difference between the vertical displacement of the second point and the first point. And Since the optical fiber sensor is used, it is hardly affected by the external environment and can perform stable measurement for a long time. Also, the displacement of the intermediate hinge connection point can be determined.
In particular, if a transmitting means for transmitting the data calculated by the calculating means and a monitoring device for receiving and recording the data transmitted by the transmitting means at a remote location are provided, the vertical displacement difference between the two points may be provided. Can be monitored remotely.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of an embodiment of the present invention.
FIG. 2 is a diagram illustrating a method for calculating a vertical displacement difference according to the present invention.
[Explanation of symbols]
10 First gantry 11 First structure 20 Second gantry 21 Second structure 30

Intermediate gantry

41, 42, 43 Hinge member 110 First horizontal beam 120 Second horizontal beam 210, 220 230, 240: first, second, third, fourth vertical beam 311: first upper optical fiber sensor 312: first lower optical fiber sensor 321: second upper optical fiber sensor 322: second lower optical fiber sensor 400: measuring unit

Claims

A two-point vertical displacement difference measuring device for measuring a difference in vertical displacement between two points horizontally separated from each other,
A plurality of horizontally extending horizontal beams hinged to each other and disposed between the first point and the second point;
A pair of vertical beams extending in a substantially vertical direction substantially parallel to each other and disposed at each end of an adjacent horizontal beam on both sides of each hinge portion,
A pair of optical fiber sensors arranged in a substantially horizontal direction at two different heights on the pair of vertical beams,
The pair of optical fiber sensors is adjacent to each other based on a difference in expansion and contraction of one optical fiber sensor from the initial installation state, a difference in expansion and contraction of the other optical fiber sensor from the initial installation state, and a difference in height of the pair of optical fiber sensors. Calculating the inclination between the horizontal beams, calculating the vertical displacement of the second point side end with respect to the first point side end of each horizontal beam from the inclination and the length of the horizontal beam, Calculating means for calculating the difference between the vertical displacement of the second point with respect to the first point by adding the vertical displacement of the horizontal beam;
A vertical displacement difference measurement device between two points, comprising:

The number of horizontal beams is n,
The length between the hinges of each horizontal beam is L _n ,
The telescopic displacement detected by the upper one of each pair of optical fiber sensors is d _n ,
The telescopic displacement ones underside of each pair of optical fiber sensor detects e _n,
When the height difference between each pair of optical fiber sensors is h,
Vertical displacement difference measuring device between two points according to claim 1, characterized in that obtaining the vertical displacement S _n by the following equation,

Transmitting means for transmitting data calculated by the calculating means,
The two-point vertical displacement difference measuring apparatus according to claim 1, further comprising a monitoring device that receives and records the data transmitted by the transmitting means at a remote place.