CN110470418A - A kind of fiber-optic grating sensor and method measuring shield duct piece pressure - Google Patents
A kind of fiber-optic grating sensor and method measuring shield duct piece pressure Download PDFInfo
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- CN110470418A CN110470418A CN201910765159.5A CN201910765159A CN110470418A CN 110470418 A CN110470418 A CN 110470418A CN 201910765159 A CN201910765159 A CN 201910765159A CN 110470418 A CN110470418 A CN 110470418A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000835 fiber Substances 0.000 claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 230000001681 protective effect Effects 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 claims description 14
- 239000013307 optical fiber Substances 0.000 claims description 14
- 238000007569 slipcasting Methods 0.000 claims description 9
- 239000002689 soil Substances 0.000 claims description 8
- 230000006378 damage Effects 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000002776 aggregation Effects 0.000 claims description 2
- 238000004220 aggregation Methods 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011799 hole material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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- Geochemistry & Mineralogy (AREA)
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- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a kind of fiber-optic grating sensors for measuring shield duct piece pressure, including injected hole axle tube device, inner ring protective device and outer ring measuring device, injected hole axle tube device includes injected hole central siphon (5), injected hole central siphon (5) includes injected hole central siphon section of jurisdiction section (6) and injected hole central siphon end section (7), a plurality of reserving hole (9) are equipped in injected hole central siphon (5), the inner ring protective device includes steel protection cap (2), steel protection cap (2) center is equipped with threaded hole (4), the outer ring measuring device includes fiber grating (12).The invention also discloses the methods of measurement section of jurisdiction pressure.Fiber-optic grating sensor of the invention, it more can accurately measure the Water And Earth Pressures outside section of jurisdiction, can between all the period of time, the whole district, whole process carries out the outer Water And Earth Pressures in section of jurisdiction and monitors, more comprehensive hole external information is provided for constructing tunnel and operation phase, once sensor is destroyed, the maintenance replacement of sensor can be carried out in time.
Description
Technical field
The invention belongs to tunneling shield construction time and operation phase monitoring technical fields, more particularly, to a kind of measurement shield
The fiber-optic grating sensor and method of structure section of jurisdiction pressure.
Background technique
With the fast development of China's underground engineering, especially Urban Rail Transit Project, shield machine plays its effect
Rate is high, disturbs the features such as small and safety economy, has obtained universal application.And with major diameter, super-large diameter tunnel it is continuous
Occur, influence of the stress condition after shield prefabricated pipe section is assembled to Tunnel Stability receives more and more attention, because of stress
The safety that uneven and generation section of jurisdiction is destroyed, the accidents such as water burst threaten engineering construction between tunnel upward floating and section of jurisdiction.
After the completion of prefabricated pipe section assembly, because of the leakproofness in tunnel and the complexity of shield-tunneling construction, pipe can not be directly monitored
Water And Earth Pressures situation outside piece, at present for Water And Earth Pressures outside section of jurisdiction mainly by between progress near from surface drilling to section of jurisdiction
It connects test or pre-buried strain gauge is monitored outside section of jurisdiction, but two methods have drawback in actual application,
Indirect test method causes disturbance to the soil body, so that test result accuracy, and the pre-buried strain gauge outside section of jurisdiction
The method of monitoring, often because construction damages sensor and loses monitoring function, and the pre-buried sensor outside section of jurisdiction
Once destruction cannot repair replacement.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of optical fiber for measuring shield duct piece pressure
Grating sensor more can accurately measure the Water And Earth Pressures outside section of jurisdiction；Sensor small volume itself dismounts more square
Just, and it is not take up additional working space；Can between all the period of time, the whole district, whole process carry out the outer Water And Earth Pressures monitoring in section of jurisdiction, for tunnel
Construction and operation phase provide more comprehensive hole external information；Once wall outer sensor is destroyed, can in time, easily into
The maintenance of line sensor is replaced, it is ensured that the continuity of monitoring.
To achieve the goals above, according to one aspect of the present invention, a kind of optical fiber measuring shield duct piece pressure is provided
Grating sensor wherein the inner ring protective device of side and is set including injected hole axle tube device, set on the injected hole axle tube device
Outer ring measuring device in the injected hole axle tube device other side；Wherein,
The injected hole axle tube device includes injected hole central siphon, is provided with screw thread on the external cylindrical surface of the injected hole central siphon,
The screw thread and on shield duct piece reserve injected hole screw thread match, the injected hole central siphon include injected hole central siphon section of jurisdiction section and
Injected hole central siphon end section, injected hole central siphon section of jurisdiction section are set in the injected hole of section of jurisdiction, injected hole central siphon end section
It docks, and is extended in section of jurisdiction with injected hole central siphon section of jurisdiction section；
A plurality of reserving hole is equipped in the injected hole central siphon, each reserving hole is distributed in the injected hole central siphon pipe
On the excircle of segment, and to the injected hole central siphon end section aggregation and can in one, from the injected hole central siphon end section
Inside it is pierced by；
The inner ring protective device includes steel protection cap, which is equipped with threaded hole, and passes through the spiral shell
Pit is sheathed in the section of injected hole central siphon end, to protect the injected hole central siphon；
The outer ring measuring device includes fiber grating, which passes through the reserving hole, in the injected hole
Central siphon section of jurisdiction section is laid out close to soil body side forming array, realizes the monitoring to soil pressure outside section of jurisdiction.
Further, the injected hole axle tube device includes handle, which is set to the slip casting by welding
On the end face of hole axle pipe end head section.
Further, the injected hole central siphon generally cylindrical structure is arranged inside shield duct piece, on external cylindrical surface
Equipped with screw thread, which matches with the threaded hole reserved on shield duct piece.
Further, the outer ring measuring device includes Rubber end, which is set to injected hole central siphon section of jurisdiction section
Right side on, generally round-like structure, the outer diameter phase of the outer diameter of the round-like structure and injected hole central siphon section of jurisdiction section
Together.
Further, the outer ring measuring device includes optical fiber grating protecting set, which is sheathed on described
On the right side of Rubber end, with the right end of the fiber grating towards being bonded.
Further, the inner ring protective device includes rubber protecting jacket, which protects set on the steel
Lid is external.
Further, the inner ring protective device includes palm grip knob, the square of the palm grip knob generally crossing distribution
Shape plate, on the end face of the steel protection cap.
Other side according to the invention provides a kind of method for measuring shield duct piece pressure, using the measurement
The fiber-optic grating sensor of shield duct piece pressure is realized, is included the following steps:
S1: fiber grating is set to inside reserving hole, and leaves reserved the end of a thread in the end face of injected hole central siphon end section,
Injected hole central siphon section of jurisdiction section is screwed in injected hole later, until Rubber end integrally exceeds section of jurisdiction outer surface, guarantees fiber grating energy
Enough it is normally carried out measurement；
S2: after injected hole central siphon section of jurisdiction section screws in, using the palm grip knob having in steel protection cap, steel is protected
Lid spiral is tightened against on the section of injected hole central siphon section of jurisdiction, until surface both is bonded, by four fiber grating connections to light
Fine Grating Modulation (FBG) demodulator starts the monitoring for carrying out Water And Earth Pressures outside section of jurisdiction；
S3: after being completed, fiber grating and fiber grating modulation /demodulation instrument are disconnected, and rubber protecting jacket is placed in
Outside steel protection cap, to prevent fiber-optic grating sensor by artificial destruction, repeat the above steps when using next time.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
1. fiber-optic grating sensor of the invention more can accurately measure the Water And Earth Pressures outside section of jurisdiction；Sensor sheet
Body small volume, dismounting is more convenient, and is not take up additional working space；Can between all the period of time, the whole district, whole process carry out section of jurisdiction
Outer Water And Earth Pressures monitoring, provides more comprehensive hole external information for constructing tunnel and operation phase；Once wall outer sensor by
It destroys, can in time, easily carry out the maintenance replacement of sensor, it is ensured that the continuity of monitoring.
2. fiber-optic grating sensor of the invention devises a kind of depending on injected hole, water and soil outside removable section of jurisdiction
Pressure monitoring device, carries out sensory feedback using fiber grating pair Water And Earth Pressures, and the stress condition outside real-time monitoring section of jurisdiction is taken
Corresponding counter-measure, to guarantee the safety of constructing tunnel.
3. fiber-optic grating sensor of the invention, the inside of reserving hole is arranged in cylinder optical fiber structure, from reserving hole
Left side be pierced by, connect the fiber grating modulation /demodulation instrument in outside, right end is for measuring stress feelings suffered by shield duct piece
Condition improves the safety of entire shield tunnel in order to the timely control of the stress condition to shield duct piece, guarantee personnel and sets
Standby safety.
4. fiber-optic grating sensor of the invention, thread rotary orientation can guarantee installing and removing inner ring protective device on the contrary
When not will lead to the loosening of injected hole axle tube device, improve the safety and reliability of the fiber-optic grating sensor.
5. fiber-optic grating sensor of the invention, equipment is simple, cost is relatively low, is not necessarily on section of jurisdiction separately prefabricated hole etc.
Advantage has energetically application value in shield tunnel project.
Detailed description of the invention
Fig. 1 is a kind of fiber-optic grating sensor structural schematic diagram for measuring shield duct piece pressure of the embodiment of the present invention；
Fig. 2 is that a kind of fiber-optic grating sensor corollary apparatus cross section for measuring shield duct piece pressure of the embodiment of the present invention shows
It is intended to.
In all the appended drawings, same appended drawing reference indicates identical technical characteristic, specifically: 1- rubber protecting jacket, 2-
Steel protection cap, 3- palm grip knob, 4- threaded hole, 5- injected hole central siphon, 6- injected hole central siphon section of jurisdiction section, 7- injected hole central siphon end
Head section, 8- handle, 9- reserving hole, 10- Rubber end, 11- optical fiber grating protecting set, 12- fiber grating.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below that
Not constituting conflict between this can be combined with each other.
To ensure that tunnel surrounding soil is stablized during shield tunnel construction, it can generally pass through slip casting reserved on section of jurisdiction
Hole carries out first slip casting, secondary grouting, and after slip casting, injected hole will be got up by closure, and therefore, shield tunnel is once built
It completes, then injected hole becomes the unique passage in connection hole and outside hole.As depicted in figs. 1 and 2, the present invention provides measurement shield pipe
The fiber-optic grating sensor of piece pressure, including injected hole axle tube device, inner ring protective device and outer ring measuring device.Slip casting hole axle
Pipe device is arranged inside shield duct piece, and inner ring protective device and outer ring measuring device are separately positioned on injected hole axle tube device
Inner end and outboard end.Inner ring protective device provides the protection in inner ring direction, outer ring measuring device for the fiber-optic grating sensor
It is transmitted to fiber grating modulation /demodulation instrument for measuring shield duct piece pressure, and by measurement result, is completed to shield duct piece pressure
Measurement.The fiber-optic grating sensor more can accurately measure the Water And Earth Pressures outside section of jurisdiction；And itself small volume, it tears open
Fill working space that is more convenient, and being not take up additional；Meanwhile can between all the period of time, the whole district, whole process carry out section of jurisdiction outside water and soil pressure
Power monitoring, provides more comprehensive hole external information for constructing tunnel and operation phase.
As depicted in figs. 1 and 2, which includes injected hole central siphon 5, injected hole central siphon section of jurisdiction section 6, slip casting
Hole axle pipe end head section 7, handle 8 and reserving hole 9.Wherein, the generally cylindrical structure of injected hole central siphon 5 is arranged in shield duct piece
Inside, length are slightly larger than shield duct piece thickness, screw thread, and and shield are provided on the external cylindrical surface of the injected hole central siphon 5
The screw thread for the injected hole reserved on section of jurisdiction matches, and injected hole central siphon section of jurisdiction section 6 is fixed on by the mode being connected through a screw thread
On shield duct piece, meanwhile, guarantee that left side and the inner-diameter end of shield duct piece of injected hole central siphon section of jurisdiction section 6 to concordant, avoid infusing
Slurry hole central siphon section of jurisdiction 6 front ends of section are stretched out to increase the risk of damage, guarantee the accurate installation of the fiber-optic grating sensor, improve
The safety and reliability of the fiber-optic grating sensor.Injected hole central siphon 5 includes injected hole central siphon section of jurisdiction section 6 and injected hole central siphon
End section 7, injected hole central siphon end section 7 are arranged on the left side of injected hole central siphon section of jurisdiction section 6.The diameter of the cylindrical structure is small
In the diameter of injected hole central siphon section of jurisdiction section 6, and it is provided on the outer end face of the cylindrical structure and injected hole central siphon section of jurisdiction 6 screw threads of section
Oppositely oriented screw thread, injected hole central siphon end section 7 are used to be connected with inner ring protective device, meanwhile, thread rotary orientation is opposite
It can guarantee the loosening that not will lead to injected hole axle tube device when installing and removing inner ring protective device, improve the optical fiber
The safety and reliability of grating sensor.The generally semicircle ring structure of handle 8, the handle 8 are arranged in by welding
On the end face of injected hole central siphon end section 7, the end face perpendicular to injected hole central siphon end section 7 of the handle 8, and rectangular section side
Connect with the left side of injected hole central siphon end section 7, meanwhile, the outer diameter of the handle 8 and the diameter of injected hole central siphon end section 7 are big
It is small identical.The handle 8 is used for when carrying out the dismounting of injected hole central siphon section of jurisdiction section 6, by clamping the handle 8 for the slip casting hole axle
Section 6 rotation in pipe section of jurisdiction is drawn or rotation is injected inside shield duct piece, in order to the installation of fiber-optic grating sensor, improves fiber grating biography
The feasibility of sensor.Reserving hole 9 is cylindrical bore, and setting is in injected hole central siphon section of jurisdiction section 6 and injected hole central siphon end section 7
Inside, the duct injected hole central siphon end section 7 be one or so perforative cylindrical bore.In injected hole central siphon section of jurisdiction section
Overall structure inside 6 is the truncated rectangular pyramids frame being made of eight ducts, and the top of the truncated rectangular pyramids frame is arranged in injected hole central siphon pipe
The left side of segment 6 is connected with the duct in injected hole central siphon end section 7, and the bottom surface of truncated rectangular pyramids frame is arranged in Rubber end 10
Right side, for installing fiber grating 12.
As depicted in figs. 1 and 2, inner ring protective device includes rubber protecting jacket 1, steel protection cap 2, palm grip knob 3 and spiral shell
Pit 4.Wherein, the generally cylindrical structure of steel protection cap 2 is arranged for the main structure of the inner ring protective device in injected hole
The left side of axle tube device.Cylindrical hole, the through-hole diameter and injected hole central siphon end section 7 is arranged in intermediate in the cylindrical structure
Diameter it is identical, convenient for the steel protection cap 2 to be mounted in injected hole central siphon end section 7,7 mentioned for injected hole central siphon end section
For protection, the safety and reliability of the fiber-optic grating sensor is improved.Threaded hole 4 be arranged in steel protection cap 2 reserve
Inside through-hole, and the screw thread in the rotation direction of the threaded hole 4 and injected hole central siphon end section 7 matches, in order to interior ring protection dress
The installation set.The left end of steel protection cap 2 is arranged in the rectangular slab of the generally crossing distribution of palm grip knob 3, the palm grip knob 3
On face, without the rectangular slab plate at the left side of threaded hole 4, which is used to facilitate the installation of inner ring protective device, leads to
Cross clamp the palm grip knob 3 by the mode that steel protection cap 2 is connected through a screw thread be fixed on injected hole central siphon end section 7 on, be
Injected hole axle tube device provides protection, and guaranteeing will not be since external factor makes it after fiber-optic grating sensor completes installation
At damage, the practicability and reliability of the fiber-optic grating sensor are improved.The generally cylindrical groove structure of rubber protecting jacket 1, should
Rubber protecting jacket 1 is arranged in the left side of steel protection cap 2, and the internal slot diameter of the rubber protecting jacket 1 and steel protection cap 2 is outer
Diameter is identical, and the depth of slot is slightly larger than handle 8 to the distance of injected hole central siphon section of jurisdiction 6 left sides of section.It is installed in steel protection cap 2
At later, which is arranged in the outside of steel protection cap 2, provides dust-proof and protection for steel protection cap 2, into
The reliability of the raising of the one step fiber-optic grating sensor.
As depicted in figs. 1 and 2, outer ring measuring device includes Rubber end 10, optical fiber grating protecting set 11 and fiber grating 12.
Wherein, the generally round-like structure of Rubber end 10, the Rubber end 10 are arranged on the right side of injected hole central siphon section of jurisdiction section 6, should
The outer diameter of round-like structure is identical as the outer diameter of injected hole central siphon section of jurisdiction section 6, while being provided with reserving hole 9 inside it most
Right section, mounting platform is provided for optical fiber grating protecting set 11 and fiber grating 12, and select rubber material that can be convenient for optical fiber light
The measurement of grid 12.The inside of reserving hole 9 is arranged in the generally cylinder optical fiber structure of fiber grating 12, the cylinder optical fiber structure,
It is pierced by from the left side of reserving hole 9, connects the fiber grating modulation /demodulation instrument in outside, right end is for measuring shield duct piece institute
The stress situation received improves the safety of entire shield tunnel in order to the timely control of the stress condition to shield duct piece, protects
The safety of witness person and equipment improve the feasibility and reliability of the fiber-optic grating sensor.Optical fiber grating protecting set 11 is whole
It is square mount structure, optical fiber grating protecting set 11 is arranged on the right side of Rubber end 10, with 12 right side of fiber grating
To fitting, fiber grating 12 is avoided directly directly to contact with the structure outside shield duct piece, avoids fiber grating 12 from being damaged, mention
The reliability of the high fiber-optic grating sensor.
A kind of fiber-optic grating sensor for measuring shield duct piece pressure of the embodiment of the present invention, working principle and its specific implementation
Steps are as follows:
Step 1:, first will be in the setting to reserving hole 9 of fiber grating 12 when carrying out fiber-optic grating sensor installation
Portion, and reserved the end of a thread is left in the left side of injected hole central siphon end section 7.Injected hole central siphon section of jurisdiction section 6 is screwed in into slip casting later
Kong Zhong guarantees that fiber grating 12 can be measured normally until Rubber end 10 is whole to exceed section of jurisdiction outer surface.
Step 2:, will using the palm grip knob 3 having in steel protection cap 2 after injected hole central siphon section of jurisdiction section 6 screws in
2 spiral of steel protection cap is tightened against on injected hole central siphon section of jurisdiction section 6, until surface both is bonded.By four fiber gratings 12
Connection starts the monitoring for carrying out Water And Earth Pressures outside section of jurisdiction to fiber grating modulation /demodulation instrument.
Step 3: after being completed, fiber grating 12 and fiber grating modulation /demodulation instrument being disconnected, and rubber is protected
Set 9 is placed in outside steel protection cap 2, to prevent fiber-optic grating sensor by artificial destruction, repeats above-mentioned step when using next time
It is rapid.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (8)
1. a kind of fiber-optic grating sensor for measuring shield duct piece pressure, which is characterized in that including injected hole axle tube device, be set to
Wherein the inner ring protective device of side and the outer ring set on the injected hole axle tube device other side measure the injected hole axle tube device
Device；Wherein,
The injected hole axle tube device includes injected hole central siphon (5), is provided with spiral shell on the external cylindrical surface of the injected hole central siphon (5)
Line, the screw thread match with the screw thread for reserving injected hole on shield duct piece, and the injected hole central siphon (5) includes injected hole central siphon pipe
Segment (6) and injected hole central siphon end section (7), injected hole central siphon section of jurisdiction section (6) are set in the injected hole of section of jurisdiction, the note
Slurry hole axle pipe end head section (7) is docked with injected hole central siphon section of jurisdiction section (6), and is extended in section of jurisdiction；
A plurality of reserving hole (9) are equipped in the injected hole central siphon (5), each reserving hole (9) is distributed in the injected hole
Central siphon section of jurisdiction section (6) excircle on, and to the injected hole central siphon end section (7) aggregation and can be in one, from the slip casting
It is pierced by hole axle pipe end head section (7)；
The inner ring protective device includes steel protection cap (2), which is equipped with threaded hole (4), and passes through
The threaded hole (4) is sheathed in injected hole central siphon end section (7), to protect the injected hole central siphon (5)；
The outer ring measuring device includes fiber grating (12), which passes through the reserving hole (9), described
Injected hole central siphon section of jurisdiction section (6) is laid out close to soil body side forming array, realizes the monitoring to soil pressure outside section of jurisdiction.
2. a kind of fiber-optic grating sensor for measuring shield duct piece pressure according to claim 1, which is characterized in that described
Injected hole axle tube device includes handle (8), which is set to injected hole central siphon end section (7) by welding
End face on.
3. a kind of fiber-optic grating sensor for measuring shield duct piece pressure according to claim 1 or 2, which is characterized in that
The injected hole central siphon (5) generally cylindrical structure is arranged inside shield duct piece, and external cylindrical surface is equipped with screw thread, the spiral shell
Line matches with the threaded hole reserved on shield duct piece.
4. a kind of fiber-optic grating sensor for measuring shield duct piece pressure according to claim 1, which is characterized in that described
Outer ring measuring device includes Rubber end (10), which is set on the right side of injected hole central siphon section of jurisdiction section (6),
Generally round-like structure, the outer diameter of the round-like structure are identical as the injected hole central siphon section of jurisdiction section outer diameter of (6).
5. a kind of fiber-optic grating sensor for measuring shield duct piece pressure according to claim 1 or 4, which is characterized in that
The outer ring measuring device includes optical fiber grating protecting set (11), which is set to the Rubber end (10)
Right side on, with the right end of the fiber grating (12) towards being bonded.
6. a kind of fiber-optic grating sensor for measuring shield duct piece pressure according to claim 1, which is characterized in that described
Inner ring protective device includes rubber protecting jacket (1), and it is external which is set to the steel protection cap (2).
7. a kind of fiber-optic grating sensor of measurement shield duct piece pressure according to claim 1 or 6, which is characterized in that
The inner ring protective device includes palm grip knob (3), the rectangular slab of palm grip knob (3) the generally crossing distribution, is set to institute
On the end face for stating steel protection cap (2).
8. a kind of method for measuring shield duct piece pressure, which is characterized in that application such as survey of any of claims 1-7
The fiber-optic grating sensor for measuring shield duct piece pressure is realized, is included the following steps:
Fiber grating (12): being set to that reserving hole (9) are internal by S1, and is left in the end face of injected hole central siphon end section (7) pre-
The end of a thread is stayed, later screws in injected hole central siphon section of jurisdiction section (6) in injected hole, until Rubber end (10) integrally exceeds section of jurisdiction outer surface,
Guarantee that fiber grating (12) can normally measure；
S2: after injected hole central siphon section of jurisdiction section (6) screws in, using the palm grip knob (3) having on steel protection cap (2), by steel
Protection cap (2) spiral processed is tightened against on injected hole central siphon section of jurisdiction section (6), until surface both is bonded, by four fiber gratings
(12) connection starts the monitoring for carrying out Water And Earth Pressures outside section of jurisdiction to fiber grating modulation /demodulation instrument；
S3: after being completed, fiber grating (12) and fiber grating modulation /demodulation instrument being disconnected, and by rubber protecting jacket (9)
It is placed in steel protection cap (2) outside, to prevent fiber-optic grating sensor by artificial destruction, repeats the above steps when using next time
.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910765159.5A CN110470418B (en) | 2019-08-19 | 2019-08-19 | Fiber bragg grating sensor and method for measuring shield segment pressure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910765159.5A CN110470418B (en) | 2019-08-19 | 2019-08-19 | Fiber bragg grating sensor and method for measuring shield segment pressure |
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| CN110470418A true CN110470418A (en) | 2019-11-19 |
| CN110470418B CN110470418B (en) | 2024-05-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115824471A (en) * | 2022-11-15 | 2023-03-21 | 中铁三局集团第四工程有限公司 | Bidirectional stress monitoring device and monitoring method for shield segment |
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| KR200374752Y1 (en) * | 2004-11-18 | 2005-02-04 | 도남시스템주식회사 | Fiber bragg grating sensor for measuring strain |
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