CN105973286A - Manufacturing method of single-point temperature compensation multifunctional intelligent anchor rod - Google Patents
Manufacturing method of single-point temperature compensation multifunctional intelligent anchor rod Download PDFInfo
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- CN105973286A CN105973286A CN201610561190.3A CN201610561190A CN105973286A CN 105973286 A CN105973286 A CN 105973286A CN 201610561190 A CN201610561190 A CN 201610561190A CN 105973286 A CN105973286 A CN 105973286A
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- temperature compensation
- gauge length
- grating
- optical fiber
- sleeve pipe
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Classifications
-
- 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
- G01D5/32—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 with attenuation or whole or partial obturation of beams of light
- G01D5/34—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 with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—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 with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
-
- 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
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
-
- 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
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
- G01D3/036—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves
-
- 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
- G01L1/246—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 using integrated gratings, e.g. Bragg gratings
Abstract
The invention discloses a manufacturing method of a single-point temperature compensation multifunctional intelligent anchor rod. The strain values of the intelligent anchor rod at different depths are measured by utilizing fiber grating sensors installed on the intelligent anchor rod so as to reckon the axial force of the anchor rod at different depths, the bearing capacity of the anchor rod and anchoring force thereof are judged and evaluated, and internal deformation and displacement change of the surrounding rock under the effect of load and the like can also be judged to some extent. The long-scale-range fiber grating sensors with temperature compensation are simple in manufacturing technology and relatively low in construction price. The single-point temperature compensation multifunctional intelligent anchor rod is mainly composed of a commonly used solid anchor rod and an integrated fusion-free long-scale-range multi-grating sensor formed by multiple long-scale-range fiber grating sensing units and temperature compensation sensing units so that the single-point temperature compensation multifunctional intelligent anchor rod is easy to manufacture and convenient to lay and has wide application prospect and great economic benefit.
Description
Technical field
The present invention relates to the anchor axial force monitoring system of a kind of tunnel, ground and slope project, be specifically related to a kind of based on length
The manufacture method of the single-point temperature compensation intelligent anchor rod of gauge length optical fibre grating.
Background technology
Suspension roof support uses in the earth's surface engineerings such as side slope, ground deep basal pit and the underground chamber such as tunnel, mining are constructed
A kind of its support reinforcement mode.Suspension roof support is the mechanical state being changed country rock itself by the anchor pole within country rock, at excavation
Form an entirety and stable rock band around face, utilize anchor pole jointly to act on country rock, reach to safeguard country rock or lane
The purpose that road etc. are stable.It is the method for protecting support of a kind of active defense, is the major transformation of the supporting such as country rock, mine.Anchor
Bar not only supporting effect is good, and materials save, construction is simple, be conducive to mechanized operation, speed of application fast.Therefore anchor pole
By substantial amounts of use in the engineerings such as a lot of buildings, ground, tunnel, mining, such as tunnel excavation based on New Austrian Tunneling Method,
Anchor pole usage amount several ten thousand easily, additionally such as Three Gorges Dam Project, has also used tens0000 various anchor poles.
Along with being widely used of suspension roof support, for anchor pole stress, bearing capacity and possible damage in country rock
Carry out in real time or periodic monitoring etc. situation, judge hence for the support conditions of country rock, stable case etc. and seem particularly
Important, and have become as the important topic of association area.At present both at home and abroad for anchor pole stress in surrounding rock supporting, hold
Carrying and the method for testing of degree of impairment can be summarized as two big classes substantially, one type is to use force-measuring anchor stock, anchor rod drawing
Meter, strain gauge and foil gauge test anchor pole stressing conditions under drawing effect and damage by anchor pole " pull-out test "
Situation；Another kind of, use and compare indirectly mode, utilize electromagnetic wave, sound wave etc. to come in the reflection differences of different medium layer
The degree of saturation of detection mortar anchoring body, the stress of Indirect evaluation anchoring and degree of impairment.But these methods are in general,
Also exist affected by environment greatly, poor durability, the shortcomings such as long-time stability are poor, and test error is big, for as ground, tunnel
The environment such as road, mining is relatively more severe, form of construction work is extensive, but measuring accuracy requires high practical engineering application, and it is suitable for
Property shows thin especially.
The optical fiber sensing technology that development in recent years is got up has a good endurance, stable performance, electromagnetism interference, is easy to distribution
The advantages such as formula measurement, also propose new thinking to anchor axial force detection, non-destructive tests etc..Current scholar's base of being correlated with
Suspension roof support detected in technology such as BOTDR, BOTDA and has been monitored, but due to the bottleneck of current demodulation techniques
Limit, its measuring accuracy wretched insufficiency；And FBG grating is high due to precision, strain measurement can reach 1 μ ε, and encapsulates
After can waterproof, corrosion-resistant, long-term behaviour is relatively good, can not only sense, and can be used for transmit data, beneficially networking
With monitoring in real time, it is widely used in the health monitoring of structure.Dalian University of Technology etc. are also by grating test
Technology has made a lot of useful work in terms of anchor pole monitoring, but is all based on point type strain testing, can only obtain very
The strained situation of local, but it is difficult to describe exactly stress and the deformation condition of the bigger anchor pole total length of scale ratio, it is impossible to right
The damage of anchor pole provides effective judgement.Generally speaking, there is following problem in current method of testing, the most simple
And simple optical fiber and the grating technology must applied, often due to not only its transducing part, and its lead-in wire is all easily damaged, no
Adapt to the construction environment of these Practical Project extensive style；2. anchor structure yardstick is big, and damage profile scope is wide, tradition
Point type sensing be difficult to accurate to capture damage；The ess-strain of anchor pole different depth is the most all ignored in the most traditional monitoring
Change, and actual country rock produces deformation due to country rock under load action, or mechanical equivalent of light excavation and the reason of explosion,
Often there will be some fragmentations in the rock stratum near excavation face, under force-bearing of surrounding rock mass effect, will appear from internal force inside it and heavily divide
Cloth, therefore on the position of anchor pole different depth, its ess-strain is likely to different；The most current optical fiber distributed type
Measuring technology is due to technical bottleneck problem, and precision is the lowest, and practicality is little；The most traditional grating test, is all base
In between grating with grating, the welding of lead-in wire connect and is realized, but the welding of optical fiber more easily causes damage and ruptures, and significantly
Ground increases its light loss, thus affects its test performance；The most traditional based on point type test mode, this point can only be obtained
Strain, it is impossible to obtain the displacement of anchor pole.7., when testing based on intelligent anchor rod, its temperature-compensating is of crucial importance,
Although point-to-point multiple spot temperature compensation is accurate, but realizes more complicated, needs the sensor simultaneously having two placements arranged side by side, lead
Cause anchor structure and extremely make the most numerous and diverse；And for the monitoring of a lot of engineering structures operation phase, its temperature field is more equal
Under conditions of one, using single-point temperature compensation that intelligent anchor rod structure can be made to simplify, operation ease is greatly increased.
In order to improve the verity of strain testing, reliability and noise robustness, Southeast China University have developed length
Gauge length optical fibre grating strain transducer, and Successful utilization is in the health monitoring of structure.All kinds of sensing based on fiber grating
The exploitation of device is carried forward vigorously, but the most little at present for the research of anchor pole and wall rock's level based on fiber grating.Mesh
Front anchor pole based on fiber grating tests the method being all based on point type strain testing, for utilizing band single-point temperature compensation to grow mark
At home and abroad retrieve away from fiber optical grating intelligent anchor pole and there is no Patents and document.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that one has pinpoint accuracy, high-durability, structure letter
Single, cheap manufacture method based on long gauge length optical fibre grating intelligent anchor rod.
The technical solution used in the present invention is: a kind of single-point temperature compensation multifunctional intellectual anchor pole, the weldless including band temperature compensation is long
The many grating sensors of gauge length, epoxy resin or anchoring adhesive, armored optical cable and flexible plastic sleeve；
The weldless many grating sensors of long gauge length of described band temperature compensation are arranged on along the sulculus that anchor pole edge is longitudinally opened, and pass through
Epoxy resin or anchoring adhesive encapsulation；
The weldless many grating sensors of long gauge length of described band temperature compensation include multiple long gauge length optical fibres that the most non-welding is connected
Grating sensing unit and a temperature-compensating sensing unit；One end of multiple long gauge length optical fibre grating sensing unit is that optical fiber draws
Going out end, the other end connects temperature-compensating sensing unit；Multiple long gauge length optical fibre grating sensing unit and a temperature-compensating pass
Sense unit includes sleeve pipe, the optical fiber being encapsulated in sleeve pipe and the grating being scribed on optical fiber, long gauge length optical fibre grating sensing list
The optical fiber two ends of unit are separately fixed at the anchor point of sleeve pipe, and temperature compensation compensates optical fiber then one end of sensing unit and long gauge length light
Fine grating sensing unit self is connected, and at anchor point and sleeve pipe concrete mutually, and the other end is freely；
The weldless many grating sensors of long gauge length of described band temperature compensation are connected with armored optical cable, and draw in anchor pole, described
Armored optical cable is through among flexible plastic sleeve.
The manufacture method of above-mentioned a kind of multifunctional intellectual anchor pole, including following step:
(1) the weldless many grating sensors of long gauge length of band temperature compensation are made
(a1) according to Practical Project Demand Design and inscribe a multiple determining deviation and different ripple on a single-mode fiber
Long grating；
(a2) selecting a thin high temperature resistant smooth sleeve pipe, interior relative aperture optical fiber is slightly thick, according to engineering test requirement
Design the anchor points of each grating, and cut out multiple breach according to anchorage point on sleeve pipe；
(a3) sleeve pipe is closed in the termination of temperature compensation end, simultaneously by the optical fiber containing multiple gratings carved in temperature
Mend unit one end to cut short, be inserted in sleeve pipe, adjust the position of grating and sleeve pipe breach so that it is
In the position of grating be near certain position designed, and the optical fiber contracting cutting short optical fiber side exists
The closed end of inside pipe casing and distance sleeve has certain distance；
(a4) first a breach nearest from sleeve closure termination is injected consolidation glue and form anchoring, so make
Contract in sleeve pipe in vacant state in the optical fiber one end obtaining temperature compensation section, and the other end and sleeve pipe anchor, this
Fiber slack in Duan and can free dilatation；
(a5) when optical fiber the most fully consolidated anchoring at temperature compensation unit, opened at optical fiber pigtail by traction apparatus
Draw, optical fiber is applied certain prestressing force, inject consolidation glue shape in remaining sleeve pipe indentation, there simultaneously
Become anchoring, after consolidation, traction apparatus is decontroled, thus produce containing multiple continuous print long gauge length optical fibres
Grating sensing unit, for each long gauge length optical fibre grating sensing unit, the optical fiber in sleeve pipe
Two ends respectively by consolidation glue fix with sleeve pipe, the optical fiber of remainder and internal surface of sleeve pipe are without connecing
Touch, though or the later stage with bolt deformation after have a little contact but frictional force is minimum negligible.
(a6) outside the weldless many grating sensors of long gauge length of band temperature compensation (including the tail optical fiber of certain length)
One layer of fibrous composite plying layer of parcel, and saturated ring epoxy resins further, it is achieved core senses
The encapsulation of device；
(2) being made into one multifunctional intellectual anchor pole
(b1) entity anchor pole is selected, and along longitudinally opening a sulculus；Prepare an armored optical cable, and be through at one
Among flexible plastic sleeve, armored optical cable is longer than flexible plastic sleeve, and two is exposed；
(b2) the band temperature compensation weldless many grating sensors of long gauge length made are fixed on the sulculus that anchor pole is opened
In, and connect with armored optical cable, draw in anchor pole；The many grating sensors of the long gauge length of weldless with
Armored optical cable carries out the joint made by flame welding of melting welding and is positioned at anchor pole sulculus, and armored optical cable is protected in sulculus
Stay and there is the length that can play anchorage effect；
(b3) in anchor pole sulculus, injection ring epoxy resins or anchoring adhesive are to filling and leading up, by the long gauge length of weldless of band temperature compensation
Many grating sensors are packaged as a whole with anchor pole, form final integrated multi-functional intelligent anchor rod.
Beneficial effects of the present invention:
(1) the intelligent anchor rod principle of the present invention is simple and reliable, and manufacture method novelty is ingenious.The present invention is mainly by peace
The fiber-optic grating sensor being contained on intelligent anchor rod measures the intelligent anchor rod strain value at different depth, thus calculates that anchor pole exists
The axle power of different depth, thus the bearing capacity and its anchor force to anchor pole judges and evaluates, simultaneously also can be to enclosing
Rock is internal under the effect of load etc. to be deformed making certain judgement with change in displacement；
(2) the long gauge length optical fibre grating sensor processing technology of the present invention is simple, and cost is compared the cheapest.The present invention
Mainly by the solid anchor pole commonly used and the nothing being made up of multiple long gauge length optical fibre grating sensing unit and a temperature unit
The many grating sensors of the long gauge length of welding form, and make simple, and it is convenient to lay, and has broad application prospects and good economy
Benefit；
(3) the many grating sensors of the long gauge length of the weldless of the present invention contain the long gauge length optical fibre grating sensing list of multiple series connection
Unit, therefore can not only measure strain and the axle power situation of the anchor pole of different depth, moreover it is possible to measure the deflection that anchor pole is axial,
Obtain sedimentation or the displacement of sliding of country rock etc.
(4) the many grating sensors of the long gauge length of the weldless of the present invention, by the multiple naked grating envelope being scribed on an optical fiber
Dress forms, therefore each sensing unit Nature Link each other, it is not necessary to welding, it is to avoid at fused fiber splice, light loss is big,
The most disconnected shortcoming；
(5) itself have employed composite and epoxy resin envelope due to the weldless of the present invention many grating sensors of long gauge length
Dress, the superior performances such as it is antirust, corrosion-resistant that it is water-fast, and it is not afraid of electromagnetic shielding and interference, after anchor pole integrative packaging
The most sturdy and durable, can be suitably used for environmental attack, there is good durability and wide applicability；
Accompanying drawing explanation
Fig. 1 is the multifunctional intellectual anchor pole organigram of the present invention；
Fig. 2 is the longitudinal sectional view of Fig. 1；
Fig. 3 is the transverse sectional view of Fig. 1；
Fig. 4 is weldless long gauge length many grating sensors organigram of the band temperature compensation of the present invention；
Fig. 5 is that the multifunctional intellectual bolt deformation amount of the present invention calculates schematic diagram.
Detailed description of the invention
The present invention will be further described with detailed description of the invention below in conjunction with the accompanying drawings.
As Figure 1-4, a kind of single-point temperature compensation multifunctional intellectual anchor pole, including the weldless many gratings of long gauge length of band temperature compensation
Sensor 7, epoxy resin or anchoring adhesive 3, armored optical cable 4 and flexible plastic sleeve 5；
The weldless many grating sensors of long gauge length 7 of described band temperature compensation are arranged on anchor pole 6 along the sulculus longitudinally opened, and
Encapsulated by epoxy resin or anchoring adhesive 3；
The weldless many grating sensors of long gauge length 7 of described band temperature compensation include multiple long gauge length optical fibres that the most non-welding is connected
Grating sensing unit 1 and a temperature-compensating sensing unit 2；One end of multiple long gauge length optical fibre grating sensing unit 1 is
Fiber pigtail, the other end connects temperature-compensating sensing unit 2；Multiple long gauge length optical fibre grating sensing unit 1 and one
Temperature-compensating sensing unit 2 includes sleeve pipe, the optical fiber being encapsulated in sleeve pipe and the grating being scribed on optical fiber, long gauge length light
The optical fiber two ends of fine grating sensing unit 1 are separately fixed at the anchor point of sleeve pipe, and temperature compensation compensates the optical fiber of sensing unit 2
Then one end self is connected with long gauge length optical fibre grating sensing unit, and at anchor point and sleeve pipe concrete mutually, and the other end is freely；
The weldless many grating sensors of long gauge length 7 of described band temperature compensation are connected with armored optical cable 4, and draw in anchor pole 6,
Described armored optical cable 4 is through among flexible plastic sleeve 5.
The manufacture method of above-mentioned a kind of multifunctional intellectual anchor pole, including following step:
(1) the weldless many grating sensors of long gauge length of band temperature compensation are made
(a1) according to Practical Project Demand Design and inscribe a multiple determining deviation and different ripple on a single-mode fiber
Long grating；
(a2) selecting a thin high temperature resistant smooth sleeve pipe, interior relative aperture optical fiber is slightly thick, according to engineering test requirement
Design the anchor points of each grating, and cut out multiple breach according to anchorage point on sleeve pipe；
(a3) sleeve pipe is closed in the termination of temperature compensation end, simultaneously by the optical fiber containing multiple gratings carved in temperature
Mend unit one end to cut short, be inserted in sleeve pipe, adjust the position of grating and sleeve pipe breach so that it is
In the position of grating be near certain position designed, and the optical fiber contracting cutting short optical fiber side exists
The closed end of inside pipe casing and distance sleeve has certain distance；
(a4) first a breach nearest from sleeve closure termination is injected consolidation glue and form anchoring, so make
Contract in sleeve pipe in vacant state in the optical fiber one end obtaining temperature compensation section, and the other end and sleeve pipe anchor, this
Fiber slack in Duan and can be with Free Transform；
(a5) when optical fiber the most fully consolidated anchoring at temperature compensation unit, opened at optical fiber pigtail by traction apparatus
Draw, optical fiber is applied certain prestressing force, inject consolidation glue shape in remaining sleeve pipe indentation, there simultaneously
Become anchoring, after consolidation, traction apparatus is decontroled, thus produce containing multiple continuous print long gauge length optical fibres
Grating sensing unit, for each long gauge length optical fibre grating sensing unit, the optical fiber in sleeve pipe
Two ends respectively by consolidation glue fix with sleeve pipe, the optical fiber of remainder and internal surface of sleeve pipe are without connecing
Touch, though or the later stage with bolt deformation after have a little contact but frictional force is minimum negligible.
(a6) outside the weldless many grating sensors of long gauge length of band temperature compensation (including the tail optical fiber of certain length)
One layer of fibrous composite plying layer of parcel, and saturated ring epoxy resins further, it is achieved core senses
The encapsulation of device；
(2) being made into one multifunctional intellectual anchor pole
(b1) entity anchor pole is selected, and along longitudinally opening a sulculus；Prepare an armored optical cable, and be through at one
Among flexible plastic sleeve, armored optical cable is longer than flexible plastic sleeve, and two is exposed；
(b2) the band temperature compensation weldless many grating sensors of long gauge length made are fixed on the sulculus that anchor pole is opened
In, and connect with armored optical cable, draw in anchor pole；The many grating sensors of the long gauge length of weldless with
Armored optical cable carries out the joint made by flame welding of melting welding and is positioned at anchor pole sulculus, and armored optical cable is protected in sulculus
Stay and there is the length that can play anchorage effect；
(b3) in anchor pole sulculus, injection ring epoxy resins or anchoring adhesive are to filling and leading up, by many for the band long gauge length of temperature compensation weldless
Grating sensor is packaged as a whole with anchor pole, forms final integrated multi-functional intelligent anchor rod.
The operation principle of the single-point temperature compensation multifunctional intellectual anchor pole based on long gauge length optical fibre grating of the present invention is as follows: be to contain
Within the long gauge length optical fibre grating sensor having multiple sensing unit is installed and is packaged in anchor pole, therefore anchor pole draws because of stress
The strain risen will be caught by all sensing units of long gauge length optical fibre grating sensor, owing to having multiple sensing unit, therefore
The strain of anchor pole diverse location can be captured, then extrapolate anchor pole in the stress of diverse location and carrying situation.Meanwhile,
Can be according to the long gauge length stress distribution in rock-bolt length direction, when its Bending Influence can be disregarded, it is possible to obtain it is square vertically
To displacement.The calculating of deflection can be carried out as follows: first obtains each long gauge length sensing unit mark after temperature-compensating
Away from interior strain value, then it is multiplied by its gauge length and obtains the deflection of this long gauge length sensing unit, then add up whole anchor
Deflection on bar.As it is shown in figure 5, by measuring mean strain ε 1, the ε 2 and ε 3 between gauge length L1, L2 and L3,
The total displacement amount Δ at anchor pole two ends then can be obtained according to formula Δ=ε 1 L1+ ε 2 L2+ ε 3 L3.From the point of view of country rock, special
The when of not being to excavate by means such as explosions for New Austrian Tunneling Method tunnel excavation etc., rock stratum can be made to occur a certain degree of broken
Broken, therefore add after anchor pole carries out supporting, at the ess-strain of different depth also by difference, the therefore intelligent anchor of the present invention
Bar more accurate can must reflect the unbalanced stress situation caused due to the internal Internal Force Redistribution in rock stratum, it is thus possible to accurate
The reflection real stress of anchor pole and carrying support conditions.Multiple intelligent anchor rods are arranged in the diverse location of country rock, can be used to
Monitoring the anchor pole carrying situation in this region, and surrounding rock supporting and stable case, this is extremely important to wall rock's level.
It should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention,
Can also make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.In the present embodiment
The clearest and the most definite each ingredient all can use prior art to be realized.
Claims (1)
1. the manufacture method of a single-point temperature compensation multifunctional intellectual anchor pole, it is characterised in that: this multifunctional intellectual anchor pole bag
Include the weldless many grating sensors of long gauge length, epoxy resin or anchoring adhesive, armored optical cable and the flexible plastic sleeve of band temperature compensation；
The weldless many grating sensors of long gauge length of described band temperature compensation are arranged on along the sulculus that anchor pole edge is longitudinally opened, and pass through
Epoxy resin or anchoring adhesive encapsulation；
The weldless many grating sensors of long gauge length of described band temperature compensation include multiple long gauge length optical fibres that the most non-welding is connected
Grating sensing unit and a temperature-compensating sensing unit；One end of multiple long gauge length optical fibre grating sensing unit is that optical fiber draws
Going out end, the other end connects temperature-compensating sensing unit；Multiple long gauge length optical fibre grating sensing unit and a temperature-compensating pass
Sense unit includes sleeve pipe, the optical fiber being encapsulated in sleeve pipe and the grating being scribed on optical fiber, long gauge length optical fibre grating sensing list
The optical fiber two ends of unit are separately fixed at the anchor point of sleeve pipe, and temperature compensation compensates optical fiber then one end of sensing unit and long gauge length light
Fine grating sensing unit self is connected, and at anchor point and sleeve pipe concrete mutually, and the other end is freely；
The weldless many grating sensors of long gauge length of described band temperature compensation are connected with armored optical cable, and draw in anchor pole, described
Armored optical cable is through among flexible plastic sleeve；
The manufacture method of above-mentioned a kind of multifunctional intellectual anchor pole, including following step:
(1) the weldless many grating sensors of long gauge length of band temperature compensation are made
(a1) according to Practical Project Demand Design and inscribe a multiple determining deviation and different ripple on a single-mode fiber
Long grating；
(a2) selecting a thin high temperature resistant smooth sleeve pipe, interior relative aperture optical fiber is slightly thick, according to engineering test requirement
Design the anchor points of each grating, and cut out multiple breach according to anchorage point on sleeve pipe；
(a3) sleeve pipe is closed in the termination of temperature compensation end, simultaneously by the optical fiber containing multiple gratings carved in temperature
Mend unit one end to cut short, be inserted in sleeve pipe, adjust the position of grating and sleeve pipe breach so that it is
In the position of grating be near certain position designed, and the optical fiber contracting cutting short optical fiber side exists
The closed end of inside pipe casing and distance sleeve has certain distance；
(a4) first a breach nearest from sleeve closure termination is injected consolidation glue and form anchoring, so make
Contract in sleeve pipe in vacant state in the optical fiber one end obtaining temperature compensation section, and the other end and sleeve pipe anchor, this
Fiber slack in Duan and can be with Free Transform；
(a5) when optical fiber the most fully consolidated anchoring at temperature compensation unit, opened at optical fiber pigtail by traction apparatus
Draw, optical fiber is applied certain prestressing force, inject consolidation glue shape in remaining sleeve pipe indentation, there simultaneously
Become anchoring, after consolidation, traction apparatus is decontroled, thus produce containing multiple continuous print long gauge length optical fibres
Grating sensing unit, for each long gauge length optical fibre grating sensing unit, the optical fiber in sleeve pipe
Two ends respectively by consolidation glue fix with sleeve pipe, the optical fiber of remainder and internal surface of sleeve pipe are without connecing
Touch, though or the later stage with bolt deformation after have a little contact but frictional force is minimum negligible；
(a6) outside the weldless many grating sensors of long gauge length of band temperature compensation, one layer of fiber composite is wrapped up further
Material plying layer, and saturated ring epoxy resins, it is achieved the encapsulation of core sensor；
(2) being made into one multifunctional intellectual anchor pole
(b1) entity anchor pole is selected, and along longitudinally opening a sulculus；Prepare an armored optical cable, and be through at one
Among flexible plastic sleeve, armored optical cable is longer than flexible plastic sleeve, and two is exposed；
(b2) the band temperature compensation weldless many grating sensors of long gauge length made are fixed on the sulculus that anchor pole is opened
In, and connect with armored optical cable, draw in anchor pole；The many grating sensors of the long gauge length of weldless with
Armored optical cable carries out the joint made by flame welding of melting welding and is positioned at anchor pole sulculus, and armored optical cable is protected in sulculus
Stay and there is the length that can play anchorage effect；
(b3) in anchor pole sulculus, injection ring epoxy resins or anchoring adhesive are to filling and leading up, by many for the band long gauge length of temperature compensation weldless
Grating sensor is packaged as a whole with anchor pole, forms final integrated multi-functional intelligent anchor rod.
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| CN201610561190.3A CN105973286A (en) | 2016-07-15 | 2016-07-15 | Manufacturing method of single-point temperature compensation multifunctional intelligent anchor rod |
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| CN201610561190.3A CN105973286A (en) | 2016-07-15 | 2016-07-15 | Manufacturing method of single-point temperature compensation multifunctional intelligent anchor rod |
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| CN107860824A (en) * | 2017-10-23 | 2018-03-30 | 北京航空航天大学 | Visit anti-integral slope anchorage structure and detection method |
| CN109579725A (en) * | 2018-12-24 | 2019-04-05 | 南京东智安全科技有限公司 | A kind of long gauge length strain transducer of high-temperature flexible, manufacturing method and application |
| CN111174827A (en) * | 2019-12-10 | 2020-05-19 | 中国科学院合肥物质科学研究院 | Intelligent screw based on optical fiber sensing and application thereof |
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