JP2005061985A - System for measuring underground displacement - Google Patents

System for measuring underground displacement Download PDF

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JP2005061985A
JP2005061985A JP2003292171A JP2003292171A JP2005061985A JP 2005061985 A JP2005061985 A JP 2005061985A JP 2003292171 A JP2003292171 A JP 2003292171A JP 2003292171 A JP2003292171 A JP 2003292171A JP 2005061985 A JP2005061985 A JP 2005061985A
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Prior art keywords
underground
buried pipe
underground buried
pipe
inclinometer
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JP2003292171A
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Japanese (ja)
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Mineo Ishizuka
峰夫 石塚
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Shimizu Construction Co Ltd
Shimizu Corp
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Shimizu Construction Co Ltd
Shimizu Corp
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Priority to JP2003292171A priority Critical patent/JP2005061985A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground displacement measuring system capable of continuously measuring underground displacement or at optional points with high accuracy and at low cost. <P>SOLUTION: A cylindrical underground buried pipe 4 having a diameter of 75 mm is buried in a hole, having a diameter of about 100 mm bored in the ground G. Plate-shaped projection parts are provided at each 90 degrees about the center axis of the underground buried pipe 4 on the circumferential surface of the underground buried pipe 4. Optical fiber sensors 3 are disposed respectively along the axial direction of the underground buried pipe 4, on the plurality of projection parts provided on the circumferential surface of the underground buried pipe 4. A clinometer 2 equipped with wheels 2a is suspended by a wire 2b in the underground buried pipe 4, and by having the wheels 2a run on grooves provided in the underground buried pipe 4 along the axial direction of the underground buried pipe 4, the clinometer 2 can move inside the underground buried pipe 4. A filling material 5 is filled between the underground buried pipe 4 and the ground G. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、地中変位計測システムに関する。   The present invention relates to an underground displacement measurement system.

従来、地中変位の計測は傾斜計によって行われているが、傾斜計による計測は地中における一定間隔ごとの計測であり、連続あるいは任意点における計測には対応できない。そのため、傾斜計に代えて光ファイバセンサを用いて任意点の計測が行える装置が提案されている(例えば、特許文献1参照。)。しかし、光ファイバセンサは、傾斜計に比べて測定誤差が大きいという問題がある。これに対し、特許文献2では、地中に埋設されるパイプに沿って複数本の光ファイバセンサを設けるとともに、パイプ内の一箇所または複数箇所に傾斜計を設置し、前記光ファイバセンサから得られる計測値を前記傾斜計から得られる計測値に基づいて補正する方法が提案されている。
特開2003−14451号公報 (第2−3頁、第1図) 特開2002−340522号公報 (第2−3頁、第1図)
Conventionally, the measurement of underground displacement has been performed by an inclinometer, but the measurement by an inclinometer is a measurement at regular intervals in the ground, and cannot cope with measurement at continuous or arbitrary points. Therefore, an apparatus capable of measuring an arbitrary point using an optical fiber sensor instead of an inclinometer has been proposed (see, for example, Patent Document 1). However, the optical fiber sensor has a problem that the measurement error is larger than that of the inclinometer. On the other hand, in Patent Document 2, a plurality of optical fiber sensors are provided along a pipe buried in the ground, and an inclinometer is installed at one or a plurality of locations in the pipe, and obtained from the optical fiber sensor. There has been proposed a method for correcting a measured value based on a measured value obtained from the inclinometer.
JP 2003-14451 (page 2-3, FIG. 1) JP 2002-340522 A (page 2-3, FIG. 1)

しかしながら、特許文献2に開示された発明は、パイプ内の特定箇所に傾斜計を固定するため、傾斜計を設置した箇所の地中変位は精確に得られるが、他の箇所の地中変位は推定値にならざるを得ない。そのため、精度を上げようとすると、傾斜計の設置箇所数を増加する必要があり、コスト増となる。
本発明は、上述する問題点に鑑みてなされたもので、連続あるいは任意点における地中変位の計測を高い精度、且つ、低コストで行うことができる地中変位計測システムを提供することを目的とする。
However, since the invention disclosed in Patent Document 2 fixes the inclinometer at a specific location in the pipe, the underground displacement at the location where the inclinometer is installed can be obtained accurately, but the underground displacement at other locations is It must be an estimated value. Therefore, to increase the accuracy, it is necessary to increase the number of inclinometers installed, which increases costs.
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an underground displacement measuring system capable of measuring underground displacement at continuous or arbitrary points with high accuracy and low cost. And

上記目的を達成するため、本発明に係る地中変位計測システムでは、地中埋設管の外周面に当該地中埋設管の軸方向に沿って複数の突設部を設け、当該複数の突設部に前記地中埋設管の軸方向に沿って光ファイバセンサをそれぞれ配設するとともに、前記地中埋設管内に前記地中埋設管の軸方向に走行自在な傾斜計が備えられていることを特徴とする。
本発明では、地中埋設管内の傾斜計を地中埋設管の軸方向に沿って移動させることにより、地中埋設管の軸方向に沿って配設された光ファイバセンサから得られる任意点の計測値を1台の傾斜計で検証することができる。
なお、光ファイバセンサによる地中変位は、地中埋設管の中心軸に関して軸対象の位置にある光ファイバセンサについて、同じ深さにおける歪量の差から曲率を求め、当該曲率を2回積分することにより算出する。そのため、本発明では、地中埋設管の外周面に当該地中埋設管の軸方向に沿って突設部を設け、当該突設部に光ファイバセンサを配設することにより、同じ深さにおける歪量の差を大きくすることで、地中変位の算出精度の向上を図っている。
また、本発明に係る地中変位計測システムでは、前記光ファイバセンサと前記傾斜計の出力を伝送するための伝送手段を備えていてもよい。
本発明では、光ファイバセンサと傾斜計の出力を無線LAN等を介して伝送することにより、遠隔地から地中変位を監視することができる。
In order to achieve the above object, in the underground displacement measuring system according to the present invention, a plurality of protruding portions are provided on the outer peripheral surface of the underground underground pipe along the axial direction of the underground underground pipe, and the plurality of protrusions are provided. Optical fiber sensors are respectively disposed along the axial direction of the underground pipe, and an inclinometer capable of traveling in the axial direction of the underground pipe is provided in the underground pipe. Features.
In the present invention, by moving the inclinometer in the underground pipe along the axial direction of the underground pipe, an arbitrary point obtained from the optical fiber sensor disposed along the axial direction of the underground pipe is obtained. The measured value can be verified with one inclinometer.
The underground displacement by the optical fiber sensor is obtained by calculating the curvature from the difference in strain at the same depth with respect to the optical fiber sensor at the axial target position with respect to the central axis of the underground buried pipe, and integrating the curvature twice. To calculate. Therefore, in the present invention, by providing a projecting portion along the axial direction of the underground tube on the outer peripheral surface of the underground tube, and disposing an optical fiber sensor on the projecting portion, the same depth is obtained. By increasing the difference in strain, the calculation accuracy of underground displacement is improved.
The underground displacement measurement system according to the present invention may further include a transmission means for transmitting the outputs of the optical fiber sensor and the inclinometer.
In the present invention, the displacement of the ground can be monitored from a remote location by transmitting the outputs of the optical fiber sensor and the inclinometer via a wireless LAN or the like.

本発明によれば、連続あるいは任意点における地中変位の計測を高い精度、且つ、低コストで行うことができる地中変位計測システムを実現することができる。   ADVANTAGE OF THE INVENTION According to this invention, the underground displacement measuring system which can perform the measurement of the underground displacement in a continuous or arbitrary point at high precision and low cost is realizable.

以下、本発明に係る地中変位計測システムの実施形態について、図面に基いて説明する。
図1は、本発明に係る地中変位計測システムの実施形態の一例を示す立断面図である。また、図2は、図1におけるA−A矢視断面図である。なお、以降の図において、図1と同一の構成要素には同一の符号を用いて説明を省略する。
図1および図2に示すように、本実施形態による地中変位計測システム1では、地盤G内に穿孔された直径100mm程の孔に直径75mm程の円筒状の地中埋設管4が埋設されている。地中埋設管4の外周面には、地中埋設管4の軸方向に沿って地中埋設管4の中心軸回り90度ごとに、板状の突設部8が設けられている。そして、地中埋設管4の外周面に設けられた複数の突設部8上には、それぞれ光ファイバセンサ3が地中埋設管4の軸方向に沿って配設されている。一方、地中埋設管4内には、車輪2aを備えた傾斜計2がワイヤ2bで懸吊されており、地中埋設管4の軸方向に沿って地中埋設管4内に設けられた溝を車輪2aが走行することで、地中埋設管4内を傾斜計2が移動できるようになっている。また、地中埋設管4と地盤Gとの間には充填材5が充填されており、充填材5は、空気抜きパイプ7から空気を抜きつつ、注入パイプ6から充填される。
Hereinafter, an embodiment of an underground displacement measurement system according to the present invention will be described with reference to the drawings.
FIG. 1 is an elevational sectional view showing an example of an embodiment of an underground displacement measuring system according to the present invention. 2 is a cross-sectional view taken along arrow AA in FIG. In the following drawings, the same components as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
As shown in FIGS. 1 and 2, in the underground displacement measuring system 1 according to the present embodiment, a cylindrical underground pipe 4 having a diameter of about 75 mm is embedded in a hole having a diameter of about 100 mm drilled in the ground G. ing. On the outer peripheral surface of the underground tube 4, a plate-like projecting portion 8 is provided every 90 degrees around the central axis of the underground tube 4 along the axial direction of the underground tube 4. And the optical fiber sensor 3 is each arrange | positioned along the axial direction of the underground pipe | tube 4 on the some protrusion part 8 provided in the outer peripheral surface of the underground pipe | tube 4. On the other hand, in the underground pipe 4, an inclinometer 2 having a wheel 2 a is suspended by a wire 2 b and is provided in the underground pipe 4 along the axial direction of the underground pipe 4. The inclinometer 2 can move in the underground pipe 4 by the wheel 2a traveling in the groove. In addition, a filling material 5 is filled between the underground pipe 4 and the ground G, and the filling material 5 is filled from the injection pipe 6 while air is extracted from the air bleeding pipe 7.

本実施形態による地中変位計測システム1が地盤G内の異なる位置に複数設置されている場合は、1台の傾斜計2を各地中埋設管4に順次挿入して計測することにより、全光ファイバセンサ3の精度の検証を行うことができる。
また、遠隔地から地中変位を監視する場合は、図示していない傾斜計自動挿入装置によってワイヤ2bの巻取りと繰出しを自動制御し、傾斜計2による走行計測を行う。その際、光ファイバセンサ3と傾斜計2の出力は、図示していない無線LAN等を介して遠隔地に伝送される。
When a plurality of underground displacement measuring systems 1 according to the present embodiment are installed at different positions in the ground G, one light inclinometer 2 is sequentially inserted into the underground pipes 4 in the various locations to measure all light. The accuracy of the fiber sensor 3 can be verified.
When the underground displacement is monitored from a remote location, the winding and feeding of the wire 2b are automatically controlled by an inclinometer automatic insertion device (not shown), and travel measurement by the inclinometer 2 is performed. At that time, the outputs of the optical fiber sensor 3 and the inclinometer 2 are transmitted to a remote place via a wireless LAN (not shown) or the like.

図3は、図2と異なる断面形状を有する地中埋設管4に関するA−A矢視断面図である。なお、地中埋設管4の断面形状は、図1および図2に示したものに限られず、適宜の形状、寸法のものが採用可能であることはいうまでもない。   FIG. 3 is a cross-sectional view taken along the line AA with respect to the underground pipe 4 having a cross-sectional shape different from that in FIG. 2. Needless to say, the cross-sectional shape of the underground pipe 4 is not limited to that shown in FIGS.

図4は、光ファイバセンサ3の構造を示す模式図である。
図4に示すように、本実施形態における光ファイバセンサ3は、外径200μm程度の光ファイバ3aを、外径2mm程度のFRP(繊維強化プラスチック)3bによって被覆し、さらにその外面を樹脂3c被覆したものである。樹脂3cの外面には、充填材5との付着を良くするため、凹凸加工(エンボス加工)が施されている。
FIG. 4 is a schematic diagram showing the structure of the optical fiber sensor 3.
As shown in FIG. 4, the optical fiber sensor 3 according to the present embodiment covers an optical fiber 3a having an outer diameter of about 200 μm with an FRP (fiber reinforced plastic) 3b having an outer diameter of about 2 mm, and further covers the outer surface thereof with a resin 3c. It is a thing. The outer surface of the resin 3c is subjected to uneven processing (embossing) in order to improve adhesion to the filler 5.

本実施形態による地中変位計測システム1では、光ファイバセンサ3から得られる任意点の計測値を1台の傾斜計2で検証することができる。
また、本実施形態による地中変位計測システム1では、傾斜計2が地中埋設管4内を走行自在であるため、傾斜計2が故障しても容易に交換することができる。
さらに、本実施形態による地中変位計測システム1では、光ファイバセンサ3と傾斜計2の出力を無線LAN等を介して伝送することにより、遠隔地から地中変位を監視することができる。
In the underground displacement measurement system 1 according to the present embodiment, a measured value at an arbitrary point obtained from the optical fiber sensor 3 can be verified by a single inclinometer 2.
Moreover, in the underground displacement measuring system 1 according to the present embodiment, since the inclinometer 2 can travel in the underground pipe 4, it can be easily replaced even if the inclinometer 2 breaks down.
Furthermore, in the underground displacement measurement system 1 according to the present embodiment, the underground displacement can be monitored from a remote place by transmitting the outputs of the optical fiber sensor 3 and the inclinometer 2 via a wireless LAN or the like.

本発明の実施形態の一例を示す立断面図である。It is an elevation sectional view showing an example of an embodiment of the present invention. 図1におけるA−A矢視断面図である。It is AA arrow sectional drawing in FIG. 図2と異なる断面形状を有する地中埋設管に関するA−A矢視断面図である。It is AA arrow sectional drawing regarding the underground pipe | tube which has a different cross-sectional shape from FIG. 光ファイバセンサの構造を示す模式図である。It is a schematic diagram which shows the structure of an optical fiber sensor.

符号の説明Explanation of symbols

1 地中変位計測システム
2 傾斜計
2a 車輪
2b ワイヤ
3 光ファイバセンサ
3a 光ファイバ
3b FRP
3c 樹脂
4 地中埋設管
5 充填材
6 注入パイプ
7 空気抜きパイプ
8 突設部
G 地盤
DESCRIPTION OF SYMBOLS 1 Ground displacement measuring system 2 Inclinometer 2a Wheel 2b Wire 3 Optical fiber sensor 3a Optical fiber 3b FRP
3c Resin 4 Underground pipe 5 Filling material 6 Injection pipe 7 Air vent pipe 8 Projection part G Ground

Claims (2)

地中埋設管の外周面に当該地中埋設管の軸方向に沿って複数の突設部を設け、当該複数の突設部に前記地中埋設管の軸方向に沿って光ファイバセンサをそれぞれ配設するとともに、前記地中埋設管内に前記地中埋設管の軸方向に走行自在な傾斜計が備えられていることを特徴とする地中変位計測システム。   A plurality of projecting portions are provided on the outer peripheral surface of the underground tube along the axial direction of the underground tube, and optical fiber sensors are provided on the plurality of projecting portions along the axial direction of the underground tube, respectively. An underground displacement measuring system comprising an inclinometer that is disposed and is capable of traveling in the axial direction of the underground pipe in the underground pipe. 前記光ファイバセンサと前記傾斜計の出力を伝送するための伝送手段を備えることを特徴とする請求項1に記載の地中変位計測システム。   The underground displacement measurement system according to claim 1, further comprising transmission means for transmitting the outputs of the optical fiber sensor and the inclinometer.
JP2003292171A 2003-08-12 2003-08-12 System for measuring underground displacement Pending JP2005061985A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008014893A (en) * 2006-07-10 2008-01-24 Chem Grouting Co Ltd Clinometer and measurement method using the same
KR100908417B1 (en) 2008-04-30 2009-07-21 최종철 Apparatus for measuring position change of underground
JP2010150810A (en) * 2008-12-25 2010-07-08 Nishimatsu Constr Co Ltd Implement and method for measuring inclination
KR101147213B1 (en) 2009-12-04 2012-05-25 권영억 a measuring device for displacement volume in underground
KR101162918B1 (en) 2009-04-16 2012-07-05 김경남 Method of measuring underground displacement using inclinometer
CN103090851A (en) * 2013-02-26 2013-05-08 宁波建工股份有限公司 Tubular pile inclination measuring device and using method thereof
CN107366313A (en) * 2017-07-19 2017-11-21 中铁隧道集团有限公司 A kind of method for embedding of inclinometer pipe
CN108917719A (en) * 2018-09-27 2018-11-30 吕梅莲 A kind of sliding inclinometer measurement and positioning structure
CN109540085A (en) * 2018-11-13 2019-03-29 国电南瑞科技股份有限公司 A kind of integrated full-automatic inclinometer

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008014893A (en) * 2006-07-10 2008-01-24 Chem Grouting Co Ltd Clinometer and measurement method using the same
KR100908417B1 (en) 2008-04-30 2009-07-21 최종철 Apparatus for measuring position change of underground
JP2010150810A (en) * 2008-12-25 2010-07-08 Nishimatsu Constr Co Ltd Implement and method for measuring inclination
KR101162918B1 (en) 2009-04-16 2012-07-05 김경남 Method of measuring underground displacement using inclinometer
KR101147213B1 (en) 2009-12-04 2012-05-25 권영억 a measuring device for displacement volume in underground
CN103090851A (en) * 2013-02-26 2013-05-08 宁波建工股份有限公司 Tubular pile inclination measuring device and using method thereof
CN107366313A (en) * 2017-07-19 2017-11-21 中铁隧道集团有限公司 A kind of method for embedding of inclinometer pipe
CN107366313B (en) * 2017-07-19 2020-08-28 中铁隧道集团有限公司 Burying method of inclinometer pipe
CN108917719A (en) * 2018-09-27 2018-11-30 吕梅莲 A kind of sliding inclinometer measurement and positioning structure
CN109540085A (en) * 2018-11-13 2019-03-29 国电南瑞科技股份有限公司 A kind of integrated full-automatic inclinometer
CN109540085B (en) * 2018-11-13 2021-02-05 国电南瑞科技股份有限公司 Integrated full-automatic inclinometer

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