CN208060071U - A kind of civil engineering fiber grating pore water pressure sensor - Google Patents
A kind of civil engineering fiber grating pore water pressure sensor Download PDFInfo
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- CN208060071U CN208060071U CN201820202008.XU CN201820202008U CN208060071U CN 208060071 U CN208060071 U CN 208060071U CN 201820202008 U CN201820202008 U CN 201820202008U CN 208060071 U CN208060071 U CN 208060071U
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- water pressure
- fiber grating
- pore water
- flexible sheet
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Abstract
The utility model discloses a kind of civil engineering fiber grating pore water pressure sensors, including stack shell, and upper top cover and base cover at stack shell both ends is arranged；Base cover is the filtering cover made by permeable stone, it is internally provided with metallic membrane in base cover, the one end for the flexible sheet that the metallic membrane other side is arranged by pedestal and column sleeve connected symmetrical dendrimer, one pin is installed between flexible sheet, and several grating fibers are laid on pin, grating fibers pass through sleeve and plug along flexible sheet；The sleeve other end is bolted on upper top cover；The sensor is mainly used in rich water environment, and carrying out reorganization to all fiber gratings in plug forms optical cable, by optical cable by being directly connected with external detection instrument after protecting sealing in plug；Optic fiber grating wavelength can be driven to generate variation by elastic material in inner barrel, will can reach the range ability, measurement accuracy and resolution ratio of pore water pressure.
Description
Technical field
The utility model is related to the test of fiber grating pore water pressure, specially a kind of civil engineering fiber grating pore water
Pressure sensor belongs to fiber-optic grating sensor comprehensive application technology and pore water pressure fields of measurement.
Background technology
Pore water pressure is an important physical quantity in geotechnical engineering, and people are born the intrapore water of the soil body,
The stress caused by the gravity of the soil body, hydrostatic pressure and external load, referred to as pore water pressure.Pore water pressure observational data,
On the one hand the discharging consolidation state for reflecting ground, on the other hand reflects the deformation stage residing for ground.Pore water pressure pair
Pile foundation has larger harm, if pore water pressure is larger, need to be depressurized to the geology residing for pile foundation before pile foundation construction.Hole
Water pressure gauge (osmometer) is a kind of for the long-term sensor for measuring ground or the water pressure in concrete inner pore.Applied to survey
Measure Fluid pressure, such as level of ground water, dam body, the soil body pore water pressure, can also be used in the hole, monitoring well and survey
The pressure of pressure pipe or hole (or infiltration) water pressure in water level concrete or ground.
Currently, the more mature technical principle applied to pore water pressure sensor is mainly type vibration wire and resistance-strain
The electric measuring type ventage piezometer of formula；And electric measuring type ventage piezometer is due to circuit, the cavity residing for sensing element, with
And the joint area seal request of conducting wire is very high, and pore water pressure sensor is mainly used in rich water environment, and it is current
And fiber Bragg grating type sensor in this respect just without so harsh；Therefore it researches and develops a kind of applied to detecting in rich water environment
Fiber grating pore water pressure sensor.
Utility model content
The technical problems to be solved in the utility model is to overcome the deficiencies of existing technologies, and provides a kind of civil engineering optical fiber
Grating pore water pressure sensor, be applied to measure Fluid pressure, such as level of ground water, dam body, the soil body pore water pressure,
It can be used in hole, the pressure or hole (or infiltration) hydraulic pressure in water level concrete or ground of monitoring well and pressure-measuring pipe
Power.
In order to solve the above-mentioned technical problem, the utility model provides the following technical solution：
The utility model provides a kind of civil engineering fiber grating pore water pressure sensor, including including stack shell, and
Upper top cover and base cover at stack shell both ends is set；Base cover is the filtering cover made by permeable stone, inside base cover
It is provided with metallic membrane, the one end for the flexible sheet that the metallic membrane other side is arranged by pedestal and column sleeve connected symmetrical dendrimer, elasticity
One pin is installed between diaphragm, and is laid with several grating fibers on pin, grating fibers pass through set along flexible sheet
Cylinder and plug；The sleeve other end is bolted on upper top cover.
As a kind of optimal technical scheme of the utility model, tube chamber welds with base on metallic membrane, with pedestal fix by column sleeve
Connection.
As a kind of optimal technical scheme of the utility model, fiber grating is fixedly connected on the inside of plug by pressing plate
String.
The advantageous effect that the utility model is reached is：The fiber grating pore water pressure sensor is mainly used for rich water environment
In, in plug to all fiber gratings carry out reorganization form optical cable, by optical cable pass through in plug protection sealing after directly
It is connected with external detection instrument；Optic fiber grating wavelength can be driven to generate variation by elastic material in inner barrel, it can be with
Reach the range ability, measurement accuracy and resolution ratio of pore water pressure.
Description of the drawings
Attached drawing is used to provide a further understanding of the present invention, and a part for constitution instruction, with this practicality
Novel embodiment for explaining the utility model, does not constitute limitations of the present invention together.
In the accompanying drawings：
Fig. 1 is the utility model fiber grating pore water pressure sensor internal structure schematic diagram；
Figure label：1, metallic membrane；2, pedestal；3, column sleeve；4, flexible sheet；5, pin；6, sleeve；7, pressing plate；8,
Upper top cover；9, plug；10, bolt；11, stack shell；12, base cover.
Specific implementation mode
The preferred embodiment of the utility model is illustrated below in conjunction with attached drawing, it should be understood that described herein excellent
It selects embodiment to be only used for describing and explaining the present invention, is not used to limit the utility model.
Embodiment：As shown in Figure 1, the utility model provides a kind of civil engineering fiber grating pore water pressure sensor,
Including including stack shell 11, and upper top cover 8 and base cover 12 at 11 both ends of stack shell are set；Base cover 12 is made by permeable stone
A filtering cover, be internally provided with metallic membrane 1 in base cover 12,1 other side of metallic membrane passes through pedestal 2 and column sleeve 3 connects
One end of symmetrically arranged flexible sheet 4 is connect, pedestal 2 is welded on metallic membrane 1, and column sleeve 3 is fixedly connected with pedestal 2；Elasticity
One pin 5 is installed between diaphragm 4, and is laid with several grating fibers on pin 5, grating fibers are worn along flexible sheet 4
Cross sleeve 6 and plug 9；Fiber grating is fixedly connected with bunchiness in 9 inside of plug by pressing plate 7；6 other end of sleeve passes through bolt 10
It is fixed on upper top cover 8.
Operation principle：The utility model is mainly used under rich water environment, and the characteristics of due to fiber grating itself, water is not present
The problem of influencing circuit and corrosion, therefore more preferably more can accurately measure interstitial water using fiber grating pore water pressure sensor
Pressure, when external water pressure passes through base cover 12, by booty filtering in 12 outside of base cover, flow acts directly on metallic membrane 1,
It is directly fixedly connected, is done so on metallic membrane 1 with column sleeve 3 by pedestal 2 between metallic membrane 1 and flexible sheet 4
Hydraulic pressure acts directly on grating fibers, and the fiber grating deformation of non-adhesive portion restores, and center reflection wavelength is constant；And it glues
The deformation being attached on pin 5 cannot restore in time, change so as to cause the center reflection wavelength of this part fiber grating, therefore
It will appear two obstructed reflection peaks in this fiber grating to appear in instrument, by the wave length shift for measuring this 2 reflection peaks
It can be with pressure-strain value.
Fibre diameter size is very small, and pore water pressure is directly delivered to by axial on fiber grating, it is impossible to make optical fiber
Grating changes, so if it is desired to by axial compression or fiber grating is made to change, therefore fiber grating is buried
It is implanted in certain elastic material, the variation of grating can be also obtained by the bending of fiber grating.Furthermore, it is contemplated that environment temperature
To the sensibility of fiber grating, it is necessary to be compensated to the temperature sensitivity of fiber grating, can connect one in ventage piezometer
A fiber grating is compensated outside pore pressure cell using individual temperature sensor.
Flexible sheet 4 uses non-metal elastic diaphragm, the existing nonmetallic highly elastic material in market very more.Generally have
Following advantages：Solidfied material is in high resiliency state, flexibility is fabulous, elasticity modulus is low, elongation percentage is big；Internal stress is minimum, cementability
Can it is good, be applicable to electronics, electric elements, printed wiring board, stress sensitive device, the electrician's component for having complicated metal insert and
The embedding and encapsulation of various kinds of sensors, mutual inductor, small and special electric machine etc..Using such as such material as implant material, it will make
The internal structure for obtaining pore pressure gauge is simplified.Select suitable elastic material, elastic material that can drive fiber grating wave
The long variation for generating 3nm, our wavelength discriminations minimum at present are 1pm, if the range of corresponding 0.1Mpa, senses resolution
Rate can reach 1/30000Mpa, will can reach the range ability, measurement accuracy and resolution ratio of pore water pressure.
Finally it should be noted that：The preferred embodiment that these are only the utility model, is not limited to this practicality
It is novel, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art,
It still can be with technical scheme described in the above embodiments is modified, or is carried out to which part technical characteristic etc.
With replacement.Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should all include
It is within the protection scope of the utility model.
Claims (3)
1. a kind of civil engineering fiber grating pore water pressure sensor, which is characterized in that including including stack shell (11), Yi Jishe
Set the upper top cover (8) and base cover (12) at stack shell (11) both ends；Base cover (12) is the filtering cover made by permeable stone,
It is internally provided with metallic membrane (1) in base cover (12), metallic membrane (1) other side passes through pedestal (2) and column sleeve (3) connection pair
Claim one end of the flexible sheet (4) of setting, a pin (5) to be installed between flexible sheet (4), and be laid on pin (5)
Several grating fibers, grating fibers pass through sleeve (6) and plug (9) along flexible sheet (4)；Sleeve (6) other end passes through spiral shell
Bolt (10) is fixed on upper top cover (8).
2. a kind of civil engineering fiber grating pore water pressure sensor according to claim 1, which is characterized in that pedestal
(2) it is welded on metallic membrane (1), column sleeve (3) is fixedly connected with pedestal (2).
3. a kind of civil engineering fiber grating pore water pressure sensor according to claim 1, which is characterized in that optical fiber
Grating is fixedly connected with bunchiness on the inside of plug (9) by pressing plate (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820202008.XU CN208060071U (en) | 2018-02-06 | 2018-02-06 | A kind of civil engineering fiber grating pore water pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820202008.XU CN208060071U (en) | 2018-02-06 | 2018-02-06 | A kind of civil engineering fiber grating pore water pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208060071U true CN208060071U (en) | 2018-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820202008.XU Active CN208060071U (en) | 2018-02-06 | 2018-02-06 | A kind of civil engineering fiber grating pore water pressure sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542510A (en) * | 2019-10-10 | 2019-12-06 | 深圳市基础工程有限公司 | Fiber grating pore water pressure sensor |
| CN111664986A (en) * | 2020-06-24 | 2020-09-15 | 中铁四局集团第一工程有限公司 | Novel pore pressure meter |
| CN113720374A (en) * | 2020-05-26 | 2021-11-30 | 奇博科技股份有限公司 | Sensing device, system and method applied to civil engineering |
-
2018
- 2018-02-06 CN CN201820202008.XU patent/CN208060071U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542510A (en) * | 2019-10-10 | 2019-12-06 | 深圳市基础工程有限公司 | Fiber grating pore water pressure sensor |
| CN113720374A (en) * | 2020-05-26 | 2021-11-30 | 奇博科技股份有限公司 | Sensing device, system and method applied to civil engineering |
| CN111664986A (en) * | 2020-06-24 | 2020-09-15 | 中铁四局集团第一工程有限公司 | Novel pore pressure meter |
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