CN110984109B - Fiber bragg grating settlement sensor - Google Patents

Fiber bragg grating settlement sensor Download PDF

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Publication number
CN110984109B
CN110984109B CN201911242101.9A CN201911242101A CN110984109B CN 110984109 B CN110984109 B CN 110984109B CN 201911242101 A CN201911242101 A CN 201911242101A CN 110984109 B CN110984109 B CN 110984109B
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China
Prior art keywords
pipe body
settlement sensor
elastic
fiber grating
pipe
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CN201911242101.9A
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Chinese (zh)
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CN110984109A (en
Inventor
段君淼
张�浩
钟志鑫
翟步升
郭志利
张雷
张兴豪
程梓轩
郑志超
李晓瑾
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Shijiazhuang Tiedao University
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Shijiazhuang Tiedao University
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Priority to CN201911242101.9A priority Critical patent/CN110984109B/en
Publication of CN110984109A publication Critical patent/CN110984109A/en
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00—Investigation of foundation soil in situ
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00—Investigation of foundation soil in situ
    • E02D1/08—Investigation of foundation soil in situ after finishing the foundation structure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • 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
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/268—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light using optical fibres
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2600/00—Miscellaneous
    • E02D2600/10—Miscellaneous comprising sensor means

Abstract

The invention provides a fiber bragg grating settlement sensor, which belongs to the technical field of soil monitoring and sensing and comprises a first pipe body, a second pipe body sleeved outside the first pipe body, an elastic part arranged in the first pipe body and a rigid element erected at the top of the first pipe body; the bottom of the first pipe body is closed; the second pipe body is in clearance fit with the first pipe body; the outer wall of the second pipe body is provided with a stress part which is used for contacting with the tested soil layer and bearing the pressure under the tested soil layer; the bottom of the elastic piece is connected with the bottom of the first pipe body, and the top of the elastic piece extends out of the first pipe body or is flush with the top end of the first pipe body; the elastic piece is attached with a fiber grating for monitoring the elongation of the elastic piece; one end of the rigid element is connected with the top end of the elastic element, and the other end of the rigid element is connected with the top end of the second tube body. The fiber bragg grating settlement sensor provided by the invention has the advantages of accurate measurement result, simple structure, convenience in installation and maintenance, and convenience in carrying and moving.

Description

Fiber bragg grating settlement sensor
Technical Field
The invention belongs to the technical field of soil monitoring and sensing, and particularly relates to a fiber bragg grating settlement sensor.
Background
In recent years, foundation settlement is caused by factors such as high-rise building construction, underground mining of minerals, underground water, soft soil foundation settlement and the like, so that settlement monitoring has very important significance on the aspects of safety of high-rise buildings, safety of high-speed rail driving and the like. In many engineering practices, the more or less harm ratio caused by soil body settlement is all the same, so in the era of rapid technological progress, people need to monitor the settlement of the soil body in real time, and people need to develop tools with higher practicability by utilizing the science and technology.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: the existing soil monitoring technology is basically complex in structure, large in measurement error and inconvenient to install.
Disclosure of Invention
The embodiment of the invention aims to provide a fiber bragg grating settlement sensor, and aims to solve the technical problems of complex structure, large measurement error and inconvenient installation of the existing soil monitoring technology.
In order to achieve the purpose, the invention adopts the technical scheme that: there is provided a fibre grating settlement sensor comprising: a first tube with a closed bottom;
the second pipe body is sleeved outside the first pipe body, and the second pipe body and the first pipe body are in clearance fit; the outer wall of the second pipe body is provided with a stress part which is used for contacting with a tested soil layer and bearing the pressure under the tested soil layer; when the tested soil layer is settled, the second pipe body can move downwards along with the soil layer under the driving of the stress part;
the elastic piece is arranged in the first pipe body, the bottom of the elastic piece is connected with the bottom of the first pipe body, and the top of the elastic piece extends out of the first pipe body; the elastic piece is attached with a fiber grating for monitoring the elongation of the elastic piece; and
the rigid element is erected on the top of the first pipe body, one end of the rigid element is connected with the top of the elastic piece, and the other end of the rigid element is connected with the top of the second pipe body; when the tested soil layer is settled, one end of the rigid element connected with the second pipe body moves downwards along with the second pipe body, and the other end of the rigid element tilts upwards and drives the elastic element to extend upwards.
As another embodiment of the present application, the force-receiving portion is a helical blade surrounding the outer wall of the second tube.
As another embodiment of the present application, a helical blade is disposed on an outer wall of the first pipe.
As another embodiment of the present application, in an initial state, a top end of the second tube is flush with a top end of the first tube.
As another embodiment of the present application, the method further includes:
the anchoring head is arranged at the bottom of the first pipe body, the top of the anchoring head is used for sealing the bottom opening of the first pipe body, and the bottom of the anchoring head is used for anchoring a stable rock stratum or a soil layer; the bottom of the elastic piece is connected with the upper part of the anchoring head.
As another embodiment of this application, anchor head includes the cone, sets up the first connecting portion at cone top, and set up second connecting portion on the first connecting portion, first connecting portion be used for with the connection can be dismantled to first body, the second connecting portion be used for with the connection can be dismantled to the bottom of elastic component.
As another embodiment of the present application, the first connection portion is threadedly connected to the first pipe body.
As another embodiment of the application, the bottom of the elastic piece is provided with a jack, and the second connecting part is provided with an inserting rod for inserting into the jack.
As another embodiment of the present application, the method further includes:
and the temperature compensation grating is arranged in the first tube body.
As another embodiment of the present application, the second tube is provided in plurality and is coaxially disposed with the first tube, respectively; the heights of the second pipe bodies are sequentially shortened from inside to outside; the top end of each second pipe body is flush with the top end of the first pipe body; the elastic part, the rigid element and the fiber bragg grating are respectively provided with a plurality of elastic parts, a plurality of rigid elements and a plurality of fiber bragg gratings which are respectively in one-to-one correspondence with the plurality of second tube bodies; when one of the soil layers is settled, the corresponding second pipe body for monitoring the soil layers moves downwards along with the soil layers, and the corresponding elastic element stretches under the pulling of the corresponding rigid element.
One of the above technical solutions has the following beneficial effects: compared with the prior art, the atress mode of elastic component when having changed the surveyed soil horizon and subsiding, can make the top of subsiding the sensor during the test be located the ground top, rigid element also can be located the ground top like this, when the second body moves down, rigid element's perk is not influenced by the pressure of soil, and the elastic component is located first body, first body only is equipped with the opening at the top again, it is internal to have avoided in the test process soil to get into first body, cause harmful effects to the measuring result, and then guaranteed measuring result's accuracy nature.
In addition, the fiber bragg grating settlement sensor provided by the embodiment of the invention has the advantages of simple structure, convenience in installation and maintenance, and convenience in carrying and moving.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic front view of a fiber grating settlement sensor according to an embodiment of the present invention;
fig. 2 is a schematic top view of a fiber grating settlement sensor according to an embodiment of the present invention;
FIG. 3 is a sectional view taken along line A-A of FIG. 2;
fig. 4 is a schematic top view of a fiber grating settlement sensor according to another embodiment of the present invention;
fig. 5 is a sectional view of the structure taken along line B-B in fig. 4.
In the figure: 100. a first pipe body; 200. a second tube body; 300. a force receiving portion; 400. an elastic member; 600. a rigid element; 700. an anchoring head; 710. a conical head; 720. a first connection portion; 730. a second connecting portion.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 5, a fiber grating settlement sensor according to an embodiment of the present invention will be described. The fiber bragg grating settlement sensor comprises a first pipe body 100, a second pipe body 200 sleeved outside the first pipe body 100, an elastic part 400 arranged in the first pipe body 100, and a rigid element 600 arranged at the top of the first pipe body 100 in an overlapping mode.
The bottom of the first tube 100 is closed. The second tube 200 is in clearance fit with the first tube 100. The outer wall of the second pipe 200 is provided with a stress part 300 for contacting the soil layer to be tested and bearing the pressure under the soil layer to be tested. When the soil layer to be detected is settled, the second pipe 200 can move downwards along with the soil layer under the driving of the stress part 300.
The bottom of the elastic member 400 is connected to the bottom of the first tube 100, and the top of the elastic member extends out of the first tube 100. The elastic member 400 is attached with a fiber grating for monitoring the elongation of the elastic member 400.
The rigid member 600 has one end connected to the top of the elastic member 400 and the other end connected to the top of the second tube 200. When the soil layer to be detected is settled, one end of the rigid element 600 connected with the second pipe body 200 moves downwards along with the second pipe body 200, and the other end tilts upwards and drives the elastic element 400 to extend upwards.
For convenience of description, the following section will simply refer to the "fiber grating settlement sensor" as the "settlement sensor".
During the use, beat at the monitoring point and establish thin thick shaft from top to bottom, insert the settlement sensor in the shaft for atress portion 300 on the second body 200 is located the surveyed soil horizon. And then the fiber grating attached to the elastic member 400 is connected to a fiber grating demodulator through an optical fiber.
When the soil layer to be detected is settled, the force-receiving portion 300 receives the downward pressure of the soil layer to drive the second pipe 200 to move downward, so that the rigid element 600 uses the top of the first pipe 100 as a pivot, one end connected with the second pipe 200 moves downward along with the second pipe 200, and the other end tilts upward, thereby driving the top end of the elastic element 400 to move upward, and the elastic element 400 is wholly elongated. At this time, the fiber bragg grating attached to the elastic member 400 transmits the detected signal to the fiber bragg grating demodulator through the optical fiber, and then the detector analyzes the data received by the fiber bragg grating demodulator to obtain the settlement amount of the soil layer to be detected.
In the prior art, the elastic member 400 is generally disposed in the first pipe 100, the force-receiving portion 300 is disposed at the middle lower portion of the first pipe 100, the top of the elastic member 400 is connected to the first pipe 100, and the bottom of the elastic member 400 is fixedly connected to the force-receiving portion 300, so that when a soil layer to be tested is settled, the force-receiving portion 300 is forced by the soil layer to move downward, and the elastic member 400 is further extended downward. The middle lower part of the first pipe body 100 is provided with a slide way for the force-bearing part 300 to slide up and down, after the first pipe body is placed in a soil body, soil easily enters the inner cavity of the first pipe body 100 through the slide way and contacts the elastic part 400 and the fiber bragg grating thereon, so that the normal stretching of the elastic part 400 is influenced, or the service life of the fiber bragg grating and the stability of a transmission signal are influenced, and the accuracy of a measuring result is influenced.
Compared with the prior art, the fiber bragg grating settlement sensor provided by the embodiment of the invention changes the stress mode of the elastic element 400 when the tested soil layer is settled, the top end of the settlement sensor can be positioned above the ground during testing, so that the rigid element 600 can also be positioned above the ground, when the second pipe body 200 moves downwards, the tilting of the rigid element 600 is not influenced by the pressure of soil, the elastic element 400 is positioned in the first pipe body 100, the first pipe body 100 is only provided with an opening at the top, the adverse influence on the measurement result caused by the fact that the soil enters the first pipe body 100 during the testing process is avoided, and the accuracy of the measurement result is further ensured.
In addition, the fiber bragg grating settlement sensor provided by the embodiment of the invention has the advantages of simple structure, convenience in installation and maintenance, and convenience in carrying and moving.
The elastic member 400 in this embodiment may be a metal elastic membrane, a rubber strip, a metal strip, or the like, as long as the above functions are achieved. The stress-bearing portion 300 may be a stress ring, a stress block or other structures fixedly disposed on the outer wall of the second tube 200, as long as the above-mentioned functions are achieved. The rigid member 600 may be a rigid rod, a rigid plate, or the like, as long as the above-described functions are achieved. The top of the first pipe 100 is open or provided with a baffle plate, and when the baffle plate is provided, the elastic member 400 extends to the outside of the first pipe 100 through the baffle plate.
As a specific embodiment of the fiber grating settlement sensor provided by the present invention, a baffle plate for plugging a top opening of the first tube 100 is disposed on a top of the first tube 100, and a through hole for the elastic member 400 to penetrate through an inner cavity of the first tube 100 is disposed in a middle of the baffle plate. The relative setting of elastic component 400 top and first body 100 apical foramen can be injectd in the setting of baffle, can not take place the slope when helping guaranteeing elastic component 400 upwards to extend, and then has guaranteed the accuracy of test result.
Referring to fig. 1, as an embodiment of the fiber grating settlement sensor of the present invention, the force-receiving portion 300 is a helical blade surrounding the outer wall of the second tube 200.
When the pipe is used, the first pipe 100 can be inserted into a vertical shaft, and then the second pipe 200 can be screwed into a soil body. The stress part 300 adopts helical blades, so that the second pipe body 200 can be conveniently inserted into soil, the stable fixed connection of the stress part 300 and a tested soil layer is realized, and the accuracy of a measuring result is further ensured. The whole settlement sensor is simple in structure and low in cost, the problems that the measuring part cannot be fully solidified with the soil body and the thickness of the soil body is variable are solved, and the settlement amount of the foundation can be accurately measured.
Referring to fig. 1, as an embodiment of the fiber grating settlement sensor provided in the present invention, a helical blade is disposed on an outer wall of a first pipe 100.
Set up helical blade on first body 100 outer wall, be convenient for first body 100 revolve the income soil, cooperate with last embodiment, further improved the convenience of the pre-buried operation of settlement sensor, improved work efficiency.
Specifically, the general settlement amount of the soil layer that awaits measuring is not big, can set up helical blade in the lower part of first body 100 during the setting, and the well upper portion of first body 100 is located to second body 200 cover, makes helical blade be less than second body 200, and then guarantees that second body 200 can not receive helical blade's on the first body 100 when moving down along with the soil layer that is surveyed blockking to measuring result's stability has been guaranteed. The inner diameter of the second pipe body 200 can be larger than the outer diameter of the helical blade on the first pipe body 100, namely, the second pipe body 200 is sleeved outside the helical blade on the first pipe body 100, so that the second pipe body 200 cannot be blocked by the helical blade on the first pipe body 100 when moving downwards along with the soil layer to be measured, and the stability of the measuring result is ensured.
Referring to fig. 1, fig. 3 and fig. 5 together, as an embodiment of the fiber grating settlement sensor according to the present invention, in an initial state, a top end of the second tube 200 is flush with a top end of the first tube 100.
Thus, the rigid member 600 can be a straight rod or a straight plate, and the connection operation with the elastic member 400 and the second tube 200 is more convenient.
Referring to fig. 1, fig. 3 and fig. 5, as an embodiment of the fiber grating settlement sensor provided by the present invention, the fiber grating settlement sensor further includes an anchoring head 700 disposed at the bottom of the first pipe 100, wherein the top of the anchoring head 700 is used for closing the bottom opening of the first pipe 100, and the bottom is used for anchoring into a stable rock stratum or a soil layer. The bottom of the elastic member 400 is connected to the upper portion of the anchoring head 700.
The stable rock stratum or soil layer is a rock stratum or soil layer which does not or hardly settle.
In use, the settlement sensor is inserted into a shaft so that the anchoring head 700 is inserted into a stabilising rock or soil layer at the bottom of the shaft. The first pipe body 100 is stably connected with a stable rock stratum or a stable soil layer, and the first pipe body 100 is prevented from settling or inclining in the monitoring process to influence the movement of the second pipe body 200, so that the accuracy of the detection result of the settlement sensor is ensured.
Referring to fig. 3 and 5, as an embodiment of the fiber grating sedimentation sensor according to the present invention, the anchoring head 700 includes a conical head 710, a first connection portion 720 disposed at a top of the conical head 710, and a second connection portion 730 disposed on the first connection portion 720, wherein the first connection portion 720 is detachably connected to the first tube 100, and the second connection portion 730 is detachably connected to a bottom of the elastic member 400.
The first connecting portion 720 is detachably connected to the first tube 100, so that the anchor head 700 or the first tube 100 can be replaced independently after being damaged, and the carrying is facilitated.
The second connecting portion 730 is detachably connected to the elastic member 400, so that the anchor head 700 or the elastic member 400 can be replaced independently after being damaged.
Referring to fig. 3 and 5, as an embodiment of the fiber grating sedimentation sensor according to the present invention, the first connection portion 720 is screwed to the first pipe 100.
When the settlement sensor is placed in a vertical shaft, the anchoring head 700 is inserted into the bottom of the vertical shaft to be anchored into a stable rock stratum or a soil layer, then the bottom of the elastic piece 400 is connected with the upper part of the anchoring head 700, then the first pipe body 100 is screwed into the vertical shaft until the first pipe body 100 is in threaded connection with the first connecting part 720 on the anchoring head 700, then the second pipe body 200 is screwed into the vertical shaft until the top end of the second pipe body 200 is flush with the top end of the first pipe body 100 or lower than the top end of the first pipe body 100, and then the top of the second pipe body 200 and the top of the elastic piece 400 are connected through the rigid element 600.
First connecting portion 720 and first body 100 threaded connection have realized both stable and zonulae occludens, have avoided both to connect the back, and the phenomenon that soil got into first body 100 inner chamber through seam crossing between the two takes place, and then has guaranteed the flexible normal clear of elastic component 400, and subsides sensor measuring result's accuracy.
As a specific embodiment of the fiber bragg grating settlement sensor provided by the present invention, the bottom of the elastic member 400 is provided with an insertion hole, and the second connection portion 730 is provided with an insertion rod for inserting into the insertion hole.
The arrangement of the insertion hole and the insertion rod enables the elastic member 400 to be quickly connected to and separated from the second connection portion 730.
As a specific embodiment of the fiber grating settlement sensor provided by the present invention, the fiber grating settlement sensor further includes a temperature compensation grating disposed in the first pipe 100.
The arrangement of the temperature compensation grating reduces the adverse effect of temperature on the measurement result, and further improves the accuracy of the measurement result of the settlement sensor.
Referring to fig. 1, 3 and 5, as an embodiment of the fiber grating settlement sensor according to the present invention, a plurality of second tubes 200 are disposed coaxially with the first tubes 100. The heights of the plurality of second pipe bodies 200 are sequentially shortened from inside to outside. The top end of each second tube 200 is flush with the top end of the first tube 100. The elastic member 400, the rigid member 600 and the fiber bragg grating are respectively provided in plural numbers, and correspond to the plural second tubes 200 one to one. When one of the soil layers is settled, the corresponding second pipe 200 for monitoring the soil layer moves down with the soil layer, and the corresponding elastic member 400 is extended by the pulling of the corresponding rigid member 600.
The second body 200 is set to monitor the settlement depth of different soil layers, and the measuring range of the settlement sensor is widened.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. Fiber grating settlement sensor, its characterized in that includes:
a first tube with a closed bottom;
the second pipe body is sleeved outside the first pipe body, and the second pipe body and the first pipe body are in clearance fit; the outer wall of the second pipe body is provided with a stress part which is used for contacting with a tested soil layer and bearing the pressure under the tested soil layer; when the tested soil layer is settled, the second pipe body can move downwards along with the soil layer under the driving of the stress part;
the elastic piece is arranged in the first pipe body, the bottom of the elastic piece is connected with the bottom of the first pipe body, and the top of the elastic piece extends out of the first pipe body; the elastic piece is attached with a fiber grating for monitoring the elongation of the elastic piece; and
the rigid element is erected on the top of the first pipe body, one end of the rigid element is connected with the top of the elastic piece, and the other end of the rigid element is connected with the top of the second pipe body; when the tested soil layer is settled, one end of the rigid element connected with the second pipe body moves downwards along with the second pipe body, and the other end tilts upwards and drives the elastic element to extend upwards;
during testing, the rigid element is positioned above the ground; when the second body moves down, the tilting of the rigid element is not influenced by the pressure of soil, the elastic piece is located in the first body, the first body is only provided with an opening at the top, the soil is prevented from entering the first body in the test process, the adverse effect on the measurement result is avoided, and the accuracy of the measurement result is further ensured.
2. The fiber grating settlement sensor of claim 1, wherein: the stress part is a helical blade which surrounds the outer wall of the second pipe body.
3. The fiber grating settlement sensor of claim 1, wherein: and the outer wall of the first pipe body is provided with a helical blade.
4. The fiber grating settlement sensor of claim 1, wherein: under the initial state, the top of second body with the top of first body is flush.
5. The fiber grating settlement sensor of claim 1, further comprising:
the anchoring head is arranged at the bottom of the first pipe body, the top of the anchoring head is used for sealing the bottom opening of the first pipe body, and the bottom of the anchoring head is used for anchoring a stable rock stratum or a soil layer; the bottom of the elastic piece is connected with the upper part of the anchoring head.
6. The fiber grating settlement sensor of claim 5, wherein: the anchor head includes the cone, sets up the first connecting portion at cone top, and set up second connecting portion on the first connecting portion, first connecting portion be used for with the connection can be dismantled to first body, the second connecting portion be used for with the connection can be dismantled to the bottom of elastic component.
7. The fiber grating settlement sensor of claim 6, wherein: the first connecting portion is in threaded connection with the first pipe body.
8. The fiber grating settlement sensor of claim 6, wherein: the bottom of elastic component is provided with the jack, be provided with on the second connecting portion and be used for inserting the inserted bar of jack.
9. The fiber grating settlement sensor of claim 1, further comprising:
and the temperature compensation grating is arranged in the first tube body.
10. The fiber grating settlement sensor of any one of claims 1 to 9, wherein: the second pipe bodies are arranged in a plurality and are respectively coaxial with the first pipe bodies; the heights of the second pipe bodies are sequentially shortened from inside to outside; the top end of each second pipe body is flush with the top end of the first pipe body; the elastic part, the rigid element and the fiber bragg grating are respectively provided with a plurality of elastic parts, a plurality of rigid elements and a plurality of fiber bragg gratings which are respectively in one-to-one correspondence with the plurality of second tube bodies; when one of the soil layers is settled, the corresponding second pipe body for monitoring the soil layers moves downwards along with the soil layers, and the corresponding elastic element stretches under the pulling of the corresponding rigid element.
CN201911242101.9A 2019-12-06 2019-12-06 Fiber bragg grating settlement sensor Active CN110984109B (en)

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Publication number Priority date Publication date Assignee Title
CN102822649B (en) * 2010-02-17 2016-02-03 桩基动力测试公司 Stake sensing equipment and using method thereof
CN203440806U (en) * 2013-08-27 2014-02-19 合肥工业大学 Photoelectric high filled earthwork settlement testing device
KR101688045B1 (en) * 2014-11-04 2016-12-20 인덕대학교 산학협력단 Complex measuring apparatus for internal displacement and pore water pressure
JP6547317B2 (en) * 2015-02-04 2019-07-24 越智　俊之 Underground displacement remote notification method
CN106092043B (en) * 2016-07-26 2018-10-30 上海电力学院 A kind of fiber-optic grating sensor based on substation's settlement measurement
CN208328885U (en) * 2018-06-08 2019-01-04 成都零一通途科技有限公司 A kind of efficient slope monitoring apparatus
CN209310685U (en) * 2019-01-25 2019-08-27 国网安徽省电力有限公司建设分公司 A kind of high roadbed soil body deep soil settlement survey device

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