CN106441660A - Anchor bolt pad force measuring device - Google Patents
Anchor bolt pad force measuring device Download PDFInfo
- Publication number
- CN106441660A CN106441660A CN201611100632.0A CN201611100632A CN106441660A CN 106441660 A CN106441660 A CN 106441660A CN 201611100632 A CN201611100632 A CN 201611100632A CN 106441660 A CN106441660 A CN 106441660A
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- Prior art keywords
- backing plate
- measuring device
- roof bolt
- fiber
- groove
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Classifications
-
- 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
Abstract
The invention provides an anchor bolt pad force measuring device and relates to the technical field of anchorage. The anchor bolt pad force measuring device comprises a pad, a fiber grating sensor, an optical fiber and a test port, the pad is provided with a reserved hole and has a first side and a second side facing each other, the second side is provided with a groove that extends to one lateral edge of the pad, and the fiber grating sensor is mounted in the groove and is connected to the test port through the optical fiber. The anchor bolt pad force measuring device is simple in structure and easy to mount, is capable of measuring the magnitude of force upon the pad, can provide online monitoring for the force upon the anchor bolt pad, and can ensure supporting performance of an anchor bolt system.
Description
Technical field
The present invention relates to anchorage technology field, in particular to a kind of roof bolt plate stress measuring device.
Background technology
Anchorage technology as a kind of superior Rock And Soil reinforcement technique method, its be by the bearing capacity of deep wall rock and
The prestressing force of anchor pole applies compressive stress to country rock, some scattered sillars is linked together, is effectively improved Yan Gu area country rock power
Learn parameter, improve country rock tension and resistance to cut intensity.Anchorage technology is increasingly widely used in various engineering fields, and anchor pole is on ground
Lower engineering support field obtains a wide range of applications, and has played important function for reduction support cost and minimizing accident.
Inventor's research finds, as important ingredient in anchoring-bolt system, its stress can be directly perceived for roof bolt plate
How the axle power size of reflection anchor pole, be directly connected to the supporting performance of anchor pole, therefore, be accurate assurance anchor axial force feature
The stress of accurate measurement backing plate is just particularly important with elastic changing features situation.Anchor in underground engineering in prior art
The monitoring of structure stress is generally using anchor axial force as important evaluation index.In order to assess support action and the mechanics shape of anchor pole
State, generally adopts the measuring methods such as resistance-strain type, type vibration wire and fiber Bragg grating type, directly carries out axle power to the body of rod of anchor pole
Measurement.These measuring methods exist complex operation, measurement result inaccurate the shortcomings of.And because the stressing conditions of anchor structure are multiple
Miscellaneous, the method for above-mentioned forces testing can not quickly reflect anchor structure force-bearing situation.At present not by roof bolt plate
Monitor and to analyze the relevant report of the research of rockbolt stress.
Content of the invention
The invention provides a kind of roof bolt plate stress measuring device is asked it is intended to improve roof bolt plate stress measurement complexity
Topic, can measure the stressing conditions of roof bolt plate, easy and simple to handle, and certainty of measurement is high.
The present invention is realized in：
A kind of roof bolt plate stress measuring device, including backing plate, fiber-optic grating sensor, optical fiber and test interface.Backing plate
Offer the preformed hole for connecting anchor rod body, backing plate has the first relative face and the second face, the second face open up fluted,
Groove extends to lateral edges of backing plate.Fiber-optic grating sensor is installed in groove, fiber-optic grating sensor pass through optical fiber with
Test interface connects.
Further, in preferred embodiments of the present invention, groove at least two, two grooves are separately positioned on reserved
The opposite sides in hole.
Further, in preferred embodiments of the present invention, backing plate has bowl-type lobe.Bowl-type lobe is by backing plate
Second protrudes towards the direction in the first face of backing plate, and preformed hole is opened in bowl-type lobe.
Further, in preferred embodiments of the present invention, groove located at bowl-type lobe and extends to the side of backing plate
Edge, fiber-optic grating sensor is arranged on groove and is located at bowl-type lobe.
Further, in preferred embodiments of the present invention, backing plate projection on the second surface is generally rectangular, groove
Width along backing plate opens up, and extends to two edges of backing plate width.
Further, in preferred embodiments of the present invention, fiber-optic grating sensor is adhered in groove by bonding agent.
Further, in preferred embodiments of the present invention, bonding agent is resinae bonding agent.
Further, in preferred embodiments of the present invention, optical fiber is layed in groove.
Further, in preferred embodiments of the present invention, roof bolt plate stress measuring device also includes the body of rod and connection
Part, the fastening end of the body of rod passes through preformed hole, and is fixed by connector with backing plate.
Further, in preferred embodiments of the present invention, roof bolt plate stress measuring device also includes data acquisition system
System, test interface data acquisition system connects.
The invention has the beneficial effects as follows：The roof bolt plate stress measuring device that the present invention is obtained by above-mentioned design, in pad
The one side of plate opens up fluted, by fiber-optic grating sensor setting in a groove.By optical fiber by fiber-optic grating sensor and survey
Mouth of trying is connected.When roof bolt plate is stressed, according to the strain variation value of fiber-optic grating sensor therefore generation, measure
Stressing conditions to roof bolt plate.Fiber-optic grating sensor have low cost, certainty of measurement is high, reproducible, response time is short,
The features such as measurement range is big, structure is simple, be easily installed, it is possible to achieve the on-line monitoring of roof bolt plate stressing conditions.By light
Fiber grating sensor measures the STRESS VARIATION of backing plate, thus ensureing the supporting performance of anchoring-bolt system.
Brief description
In order to be illustrated more clearly that the technical scheme of embodiment of the present invention, below will be to use required in embodiment
Accompanying drawing be briefly described it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, be therefore not to be seen as
It is the restriction to scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also root
Obtain other related accompanying drawings according to these accompanying drawings.
Fig. 1 is the sectional view of roof bolt plate stress measuring device provided in an embodiment of the present invention；
Fig. 2 is the sectional view of the backing plate in Fig. 1；
Fig. 3 is the structural representation under roof bolt plate stress measuring device first visual angle in Fig. 1；
Fig. 4 is schematic diagram before undressed bowl-type lobe for the backing plate shown in Fig. 2.
Icon：100- roof bolt plate stress measuring device；The 110- body of rod；120- connector；121- nut；310- backing plate；
310a- substrate；311- first face；312- second face；313- groove；314- bowl-type lobe；320- fiber-optic grating sensor；
330- optical fiber；340- test interface；350- preformed hole；410- data collecting system.
Specific embodiment
Purpose, technical scheme and advantage for making embodiment of the present invention are clearer, implement below in conjunction with the present invention
Accompanying drawing in mode, is clearly and completely described the reality it is clear that described to the technical scheme in embodiment of the present invention
The mode of applying is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ability
The every other embodiment that domain those of ordinary skill is obtained under the premise of not making creative work, broadly falls into the present invention
The scope of protection.Therefore, below the detailed description of the embodiments of the present invention providing in the accompanying drawings being not intended to limit will
Seek the scope of the present invention of protection, but be merely representative of the selected embodiment of the present invention.Based on the embodiment in the present invention,
The every other embodiment that those of ordinary skill in the art are obtained under the premise of not making creative work, broadly falls into this
The scope of invention protection.
In describing the invention it is to be understood that term " orientation of instruction or the position such as " center ", " width ", " interior "
The relation of putting is based on orientation shown in the drawings or position relationship, is for only for ease of the description present invention and simplifies description, rather than
Indicate or the hint equipment of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not
It is interpreted as limitation of the present invention.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or hint relative importance
Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include one or more this feature.In describing the invention, " multiple " are meant that two or more,
Unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects
Connect or electrically connect；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements.For the ordinary skill in the art, can be according to concrete feelings
Condition understands above-mentioned term concrete meaning in the present invention.
Embodiment
Referring to figs. 1 to shown in Fig. 3, the present invention provides a kind of roof bolt plate stress measuring device 100, including the body of rod 110, even
Fitting 120, backing plate 310, fiber-optic grating sensor 320, optical fiber 330 and test interface 340.
With reference to shown in Fig. 2 and Fig. 3, backing plate 310 offers the preformed hole 350 for connecting-rod body 110, and preformed hole 350 is
Through hole.Backing plate 310 has the first relative face 311 and the second face 312, and the second face 312 opens up fluted 313, and groove 313 extends
Lateral edges to backing plate 310.Fiber-optic grating sensor 320 is installed in groove 313, and fiber-optic grating sensor 320 passes through light
Fine 330 are connected with test interface 340.
When strain around fiber-optic grating sensor 320, stress or other measured physical quantity change, fiber grating
Sensor 320 produces the wavelength shift of fiber-optic signal, by the situation of Detection wavelength displacement, you can obtain the change of measured physical quantity
Change situation.
Fiber-optic grating sensor 320 has compact, soft, strong antijamming capability, collection sensing and is transmitted in one, is easy to make
The advantages of make and imbed, also has that wavelength separated ability is strong, a, sensing accuracy insensitive to environmental disturbances and sensitivity is high, energy
Absolute number measurement, moistureproof, corrosion-resistant, the advantages such as multiplexing can be connect by ship between life-span length, multiple sensor, can meet supporting knot
The high accuracy of structure detection, the technical requirements of remote, distributed and chronicity, have the irreplaceable work of other types sensor
With.
Second face 312 of backing plate 310 is connected to anchoring surface, offers two grooves 313 in backing plate 310 second face 312,
Two grooves 313 are separately positioned on the opposite sides of preformed hole 350.It is further preferred that two grooves 313 are along preformed hole 350
Axisymmetrical distribution, be mounted on fiber-optic grating sensor 320 in two grooves 313.In the present embodiment, two grooves
313 is parallel to each other in the plane perpendicular to preformed hole 350 axis, installs two on the symmetrical position of two grooves 313
Fiber-optic grating sensor 320, conveniently carries out the measurement of data and calibration so that the stressing conditions of the backing plate 310 recording are more smart
Accurate.
It should be noted that in other embodiments of the invention, groove 313 can only open up one it is only necessary to meet
The requirement of fiber-optic grating sensor 320 can be installed.Can also be that multiple grooves 313 and multiple are arranged on backing plate 310
Fiber-optic grating sensor 320, such as 3,4,5 etc..Preferably, the quantity of groove 313 is even number, and even number groove
313 along preformed hole 350 axisymmetrical setting.Accordingly, it is equiped with the even number optical fiber light corresponding with groove 313 number
Gate sensor 320, and the installation site of even number fiber-optic grating sensor 320 is along the axisymmetrical of preformed hole 350.
Backing plate 310 has bowl-type lobe 314, bowl-type lobe 314 from backing plate 310 the second face 312 to backing plate 310
The direction in the first face 311 is protruded, and preformed hole 350 is opened in bowl-type lobe 314.Backing plate 310 is mainly used in improving anchoring-bolt system
Anchoring property, for changing the end stressing conditions of the body of rod 110, strengthen consolidation effect, convenient when using apply prestressing force.
The backing plate 310 of abnormity can reduce unbalance stress even stress concentration phenomenon it is ensured that the body of rod 110 center stressed.Bowl is set simultaneously
Shape lobe 314 can make backing plate 310 adapt to deformation, constantly discharges with peripheral rock stress, country rock deforms upon, the body of rod
Stress suffered by 110 is gradually increased so that backing plate 310 deforms upon, and realizes allowing pressure by way of backing plate 310 deformation.
The cross section of bowl-type lobe 314 is hemispherical, and bowl-type lobe 314 is located at the center of backing plate 310, reserves
Hole 350 be opened in bowl-type lobe 314 center position so that the body of rod 110 outer dynamic balance that puts on backing plate 310 it is ensured that
Optimal allow pressure effect, extend the service life of backing plate 310.It is understood that in other embodiments of the invention, bowl-type
Specific restriction is not done in the position of lobe 314 and preformed hole 350.
Groove 313 located at bowl-type lobe 314, and extend to lateral edges of backing plate 310.Fiber-optic grating sensor
320 are arranged in groove 313 and are located at bowl-type lobe 314.When backing plate 310 is connected to anchoring surface, bowl-type lobe 314
It is not directly contacted with anchoring surface, protect the fiber-optic grating sensor 320 being mounted thereon that surrouding rock stress will not be answered to be squeezed,
The service life of extended fiber grating sensor 320.Ensure the shadow that bowl-type lobe 314 is not expanded with heat and contract with cold by anchoring surface simultaneously
Ring, enable the data recording truly to reflect the pressure that backing plate 310 is subject to.
Optical fiber 330 be used for realizing the connection of fiber-optic grating sensor 320 and test interface 340 it is ensured that test data defeated
Go out.In the present embodiment, optical fiber 330 is layed in groove 313, stretches out from lateral edges of backing plate 310.Optical fiber 330 is from groove 313
Middle extraction, convenient installation, be conducive to protecting optical fiber 330, extend the service life of product.
It is further preferred that projection on the second face 312 for the backing plate 310 is generally rectangular, groove 313 is along backing plate 310
Width open up, and extend to two edges of backing plate 310 width.Groove 313 extends to two sides of backing plate 310
Edge, convenient processing.In actual use, after having installed fiber-optic grating sensor 320, light can be selected according to the actual requirements
Fine 330 stretch out from which lateral edges of backing plate 310, meet use demand, convenient and efficient.It is understood that art technology
Personnel can design, according to practical situation, position and the track extending that groove 313 opens up.
Fiber-optic grating sensor 320 is adhered in groove 313 by bonding agent, and bonding agent is used for fixing and protect optical fiber light
Gate sensor 320, makes fiber-optic grating sensor 320 firmly be installed in backing plate 310, improves its stability and service life.
It is understood that in other embodiments of the invention, fixed form in groove 313 for the fiber-optic grating sensor 320
Can be the other forms beyond bonding, such as installation pedestal is set on fiber-optic grating sensor 320, install substrate clamping or
It is installed in groove 313 by securing member.
Preferably, bonding agent selects resinae bonding agent, such as epoxy glue resin adhesive, but is not limited to this.Epoxy
The corrosion resistance of gum resin and dielectric properties are good, energy acid and alkali resistance, salt, and its adhesive property and sealing property are excellent, insulating properties
Good, adverse circumstances, extended fiber grating sensor 320 and the backing plate of roof bolt plate stress measuring device 100 work can be suitable for
310 service life.
Projection on the first face 311 of backing plate 310 for the groove 313 is substantially rectangular, and groove depth is 1-3mm, preferably
2mm, is easy to processing and the making of groove 313, and is easy to install fiber-optic grating sensor 320 and optical fiber 330, but is not limited to
This.Those skilled in the art can be processed to the shape and depth of groove 313 according to the actual requirements.
Refering to shown in Fig. 1, the fastening end of the body of rod 110 of roof bolt plate stress measuring device 100 passes through preformed hole 350, and
Pass through connector 120 with backing plate 310 to fix.Connector 120 is preferably nut 121, the fastening end phase of nut 121 and the body of rod 110
Coupling and nut 121 is fixed on the first face 311 of backing plate 310.The inwall of nut 121 is provided with female thread, fastens with the body of rod 110
The external screw thread of end setting matches, and realizes the body of rod 110 and the connection of backing plate 310, makes simple, conveniently operates.For subtracting further
Few stress concentration phenomenon, can add packing ring (not shown) between nut 121 and backing plate 310, extend, and roof bolt plate stress measures
The service life of device 100.It should be noted that connector 120 can also be that other have the device of fastening effect.
Refer to Fig. 3, the roof bolt plate stress measuring device 100 that the present embodiment provides also includes data collecting system 410,
Test interface 340 data acquisition system 410 connects.
The present embodiment also provides a kind of processing method of roof bolt plate stress measuring device 100, and it comprises the following steps：
Refering to shown in Fig. 4, taking a substrate 310a, substrate 310a is substantially plate, opens up on plate substrate 310a
Go out preformed hole 350, open up out groove 313 in plate substrate 310a, groove 313 is located at the second face 312, and groove 313 extends
Lateral edges to substrate 310a；Along plate substrate 310a the second face 312 to the direction in the first face 311 in plate substrate
Bowl-type lobe 314 is gone out on 310a it is ensured that groove 313 part is located at bowl-type lobe 314；By fiber-optic grating sensor 320
It is attached in groove 313 with optical fiber 330, one end of optical fiber 330 connects fiber-optic grating sensor 320 and other end connecting test connects
Mouth 340, that is, obtain the backing plate 310 of the present embodiment offer.First on substrate 310a, open up out groove 313, then it is raised to go out bowl-type
Portion 314, fiber-optic grating sensor 320 is installed in the position that groove 313 is located at bowl-type lobe 314, and processing method is simple, raw
Product condition is easy to control it is adaptable to produce manufacture in enormous quantities.
It should be noted that in other embodiments of the invention, it is convenient to omit go out bowl-type lobe in substrate 310a
314 the step for.
During use, backing plate 310 and the body of rod 110, connector 120 are assembled and can be obtained by the measurement of roof bolt plate stress
Device 100.
The operation principle of roof bolt plate stress measuring device 100 is：The body of rod 110 is inserted the preformed hole 350 of backing plate 310
In, nut 121 is sheathed on the body of rod 110 and is connected to the first face 311 of backing plate 310, groove 313 is opened in the of backing plate 310
Two faces 312.Second face 312 of backing plate 310 is protruded to the direction in the first face 311 and is formed bowl-type lobe 314, optical fiber grating sensing
Device 320 is installed in the part that groove 313 is located at bowl-type lobe 314.One end of optical fiber 330 connects fiber-optic grating sensor 320,
The other end extends along groove 313 and is connected with test interface 340.Test interface 340 data acquisition system 410 connects.Pad
In plate 310 loading process, backing plate 310 strains and acts on fiber-optic grating sensor 320, and fiber-optic grating sensor 320 is subject to
Its reflecting light length is made to change to effects of strain, wavelength change is sent to data collecting system by test interface 340
410, carry out signal-data processing and storage.Read the change of the wavelength of fiber-optic grating sensor 320 by data collecting system 410
Change, be converted into the deformation of backing plate 310, and then measure the size of 310 stress of backing plate.According to practical situation carry out disaster alarm or
In time the external force acting on backing plate 310 is done and adjust to provide drag accordingly, change the force-bearing situation of rock mass, example in time
As increased confined pressure, improve the mechanics parameter of rock, improve the mechanical property of rock mass, effectively improve the body of rod 110 and backing plate 310
Shield performance.
To sum up, the roof bolt plate stress measuring device 100 of the offer of the present invention, opens up recessed in the second face 312 of backing plate 310
Groove 313, installs fiber-optic grating sensor 320, accurately measures the stressing conditions of backing plate 310.This roof bolt plate stress measurement dress
Put 100 structures simple, easy for installation.Backing plate 310 stressing conditions monitoring impact interfered by outside is little, according to backing plate 310 stress
Situation can reflect the supporting performance of state of surrounding rock and anchoring system, can be obtained by precisely may be used by simple data analysiss
The result leaned on.
The foregoing is only the preferred embodiment of the present invention, be not limited to the present invention, for this area
For technical staff, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made any
Modification, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of roof bolt plate stress measuring device is it is characterised in that include backing plate, fiber-optic grating sensor, optical fiber and test
Interface, described backing plate offers the preformed hole of the body of rod for connecting anchor pole, and described backing plate has relative the first face and second
Face, described second face opens up fluted, and described groove extends to lateral edges of described backing plate, described fiber-optic grating sensor peace
It is loaded in described groove, described fiber-optic grating sensor is connected with described test interface by described optical fiber.
2. roof bolt plate stress measuring device according to claim 1 is it is characterised in that described groove at least two,
Two described grooves are separately positioned on the opposite sides of described preformed hole.
3. roof bolt plate stress measuring device according to claim 1 is it is characterised in that described backing plate has bowl-type projection
Portion, described bowl-type lobe is protruded towards the direction in described first face by described second, and described preformed hole is opened in described bowl-type
Lobe.
4. roof bolt plate stress measuring device according to claim 3 is it is characterised in that described groove is located at described bowl-type
Lobe and extend to lateral edges of described backing plate, described fiber-optic grating sensor is arranged on described groove and is located at described bowl
Shape lobe.
5. roof bolt plate stress measuring device according to claim 1 is it is characterised in that described backing plate is in described second face
On projection be generally rectangular, described groove opens up along the width of described backing plate, and extends to described backing plate width side
To two edges.
6. roof bolt plate stress measuring device according to claim 1 is it is characterised in that described fiber-optic grating sensor leads to
Cross bonding agent to be adhered in described groove.
7. roof bolt plate stress measuring device according to claim 6 is it is characterised in that described bonding agent glues for resinae
Connect agent.
8. roof bolt plate stress measuring device according to claim 1 it is characterised in that described optical fiber be layed in described recessed
In groove.
9. roof bolt plate stress measuring device according to claim 1 is it is characterised in that described roof bolt plate stress measures
Device also includes the body of rod and connector, and the fastening end of the described body of rod passes through described preformed hole, and passes through described company with described backing plate
Fitting is fixed.
10. roof bolt plate stress measuring device according to claim 1 is it is characterised in that described roof bolt plate stress is surveyed
Amount device also includes data collecting system, and described test interface and described data collecting system connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611100632.0A CN106441660A (en) | 2016-12-02 | 2016-12-02 | Anchor bolt pad force measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611100632.0A CN106441660A (en) | 2016-12-02 | 2016-12-02 | Anchor bolt pad force measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106441660A true CN106441660A (en) | 2017-02-22 |
Family
ID=58223726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611100632.0A Pending CN106441660A (en) | 2016-12-02 | 2016-12-02 | Anchor bolt pad force measuring device |
Country Status (1)
| Country | Link |
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| CN (1) | CN106441660A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108918012A (en) * | 2018-07-16 | 2018-11-30 | 中铁十四局集团有限公司 | One kind being used for Shield-bored tunnels country rock Disturbance stress monitoring method |
| CN108955965A (en) * | 2018-07-27 | 2018-12-07 | 西南交通大学 | It is a kind of for detecting the detection device and method of suspension roof support stress spread range |
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Application publication date: 20170222 |