CN107991189A - A kind of prestressed cable anchorage performance testing device and test method - Google Patents
A kind of prestressed cable anchorage performance testing device and test method Download PDFInfo
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- CN107991189A CN107991189A CN201711278666.3A CN201711278666A CN107991189A CN 107991189 A CN107991189 A CN 107991189A CN 201711278666 A CN201711278666 A CN 201711278666A CN 107991189 A CN107991189 A CN 107991189A
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- steel strand
- strand wires
- foil gauge
- anchor cable
- strain
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
Abstract
The present invention relates to a kind of prestressed cable anchorage performance testing device and its test method.Test device includes stretching measurement equipment and anchor cable, the anchor cable includes multiple strain brick, multiple miniature soil pressure cells, multiple foil gauges, more steel strand wires and casings, wherein, orthogonal foil gauge and joint gasket are equipped with the upper surface of the strain brick, vertical on one side to be equipped with foil gauge and joint gasket, corresponding another side is equipped with miniature soil pressure cell；Multiple foil gauges are connected with as steel strand wires foil gauge on wherein one of the more steel strand wires, the steel strand wires are as detection steel strand wires, multiple strain bricks need to be fixed on the detection steel strand wires according to measure, all foil gauges and the miniature soil pressure cell are respectively connected with conducting wire, and the conducting wire is used to connect stretching measurement equipment.The present invention studies the stress of injecting cement paste using the cooperative transformation of brick and injecting cement paste is strained, can Validity Test prestress anchorage cable anchoring property, provide foundation for analysis steel strand wires and injecting cement paste stress distribution and mechanism of Evolution.
Description
Technical field
The present invention relates to prestress anchorage cable technical field of measurement and test, and in particular to a kind of prestressed cable anchorage performance test dress
Put and test method.
Background technology
Prestress anchorage cable can give full play to and improve the intensity of Rock And Soil, effectively control the deformation of Rock And Soil, and have anchor
The features such as Gu radius is big, anchor force is strong, reinforcing scope is wide, so it is extensive in the engineerings such as foundation pit, side slope, tunnel, mine
Using, and play an important role.With the extensive application of Anchorage Technology, since anchorage cable anchoring power relaxes, dowel destroys, pole
The accident that the various reasons such as limit anchor force deficiency trigger also emerges in an endless stream, and great damage is caused to social economy and personal safety
Lose.But at present, the correlation theory such as the anchoring mechanical characteristic of Anchorage Technology and failure evolvement mechanism seriously lags behind anchoring skill
The engineer application of art, this is mainly due to anchorage cable anchoring performance test methods Shortcomings.Prestress anchorage cable is thin for flush type length
Rod structure, since own structural characteristics cause anchorage cable anchoring performance test methods to be limited to.The larger sensor embedment of volume
The mechanical property of former anchor structure will certainly be influenced, and can not then be taken out after the embedment of sensor, therefore expensive sensor buries
Membership increases testing cost, influences to anchor the popularization of measuring technology.
The test method for prestress anchorage cable general at present is added between anchor end of anchorage cable anchorage and purlin
If anchor cable axle power meter.The real-time change of prestressd anchor cable can be obtained by anchor cable axle power meter, meanwhile, coordinate peripheral hardware displacement meter,
The drawing property experiment of anchor cable can be carried out, obtains the correspondence of anchor cable elongation and anchor cable axle power.But the method only can be with pin
Anchor cable integrated prestress is measured, but the stress distribution and steel strand wires-slip casting body interface of anchor cable steel strand wires can not be directed to
Bond stress distribution measure.
For the anchoring property of preferably research anchor cable, the engineering value of anchor cable is preferably played, while grasp anchor cable dowel
With the stress distribution in injecting cement paste, the present invention uses the methods of being embedded to prefabricated strain brick, foil gauge to anchorage cable anchoring mechanical property
Tested with limit anchoring force etc..
The content of the invention
(1) technical problems to be solved
In order to solve the above problem of the prior art, the present invention provide a kind of prestressed cable anchorage performance testing device and
Method, can Validity Test prestress anchorage cable anchoring property.Solution can not effectively measure the whole axis side of anchor cable in the prior art
To stress distribution technical problem.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include：
A kind of prestressed cable anchorage performance testing device, it includes stretching measurement equipment and anchor cable, and the anchor cable includes
Multiple strain brick, multiple miniature soil pressure cells, multiple foil gauges, more steel strand wires and casings, wherein, in the upper of the strain brick
Surface is equipped with orthogonal foil gauge and joint gasket, and foil gauge and joint gasket are vertically equipped with one side, and correspondence is another
Side is equipped with miniature soil pressure cell, and the foil gauge connects the joint gasket, and the front of the strain brick is equipped with three
Aperture；Multiple foil gauges are connected with wherein one of the more steel strand wires as steel strand wires foil gauge, the steel strand wires conduct
Steel strand wires are detected, multiple strain bricks need to be fixed on the detection steel strand wires, all foil gauges and institute according to measure
State miniature soil pressure cell and be respectively connected with conducting wire, the conducting wire is used to connect stretching measurement equipment, and described sleeve pipe is placed on described more
The outside of steel strand wires, and arranged on the free segment of the anchor cable, the more steel strand wires are placed in anchor hole the injecting paste material system that pours
Into anchor pole, the material of the strain brick is identical with the injecting paste material of anchor pole.
Test device as described above, it is preferable that the stretching measurement equipment includes wedge, force snesor, jack, position
Meter and strain acquirement instrument are moved, the wedge is set close to building enclosure, and the force snesor connects the wedge, the jack
The force snesor is connected, billet is additionally provided between the jack and the force snesor, the anchor cable connects jack
Set, the displacement meter is used for the displacement for measuring anchor cable anchor head and building enclosure, the foil gauge, miniature soil pressure cell, displacement
Meter connects the strain acquirement instrument with the force snesor.
Test device as described above, it is preferable that the size of the strain brick is 40mm × 35mm × 20mm, described 3
A diameter of 3mm of aperture.
A kind of prestressed cable anchorage performance test methods, it includes the following steps：
The making and installation of S1, sensor
S101, strain brick make：Strain brick is poured using slip casting raw material, the strain brick is cuboid, and cuboid is just
Foil gauge is pasted respectively mutual vertically along three X-axis, Z axis, Y-axis directions in face equipped with three apertures, its upper surface and one side
And joint gasket, foil gauge jointing gasket, the another side of corresponding one side are equipped with miniature soil pressure cell, the pad connector
Piece is welded with conducting wire；
S102, the installation of steel strand wires foil gauge：Polish in corresponding point position a wherein steel strand wires, for connecting
Foil gauge and connector backing plate, the foil gauge are connected by connector backing plate with conducting wire, and conducting wire is along one lateral free section of anchor cable of steel strand wires
Side combs；
S103, on the steel strand wires of foil gauge are connected with, fixed strain brick is needed according to measurement, the strain brick band should
The conducting wire for becoming piece and miniature soil pressure cell is combed to free section of anchor cable side；
S2, the installation for testing anchor cable
S201, install the strain brick and steel strand wires foil gauge that the S1 is obtained according to test request on a steel strand wires,
The conducting wire of the strain brick and steel strand wires foil gauge is combed to anchor head, the casing on the free segment set of anchor cable；
The above-mentioned S201 steel strand wires obtained, be put into and need in the anchor hole tested by S202, using the water needed for test request
Cement mortar carries out slip casting, and when anchor hole mouth overflows cement mortar, slip casting terminates, and installation is complete for test anchor cable；
S3, test loading
After the test anchor cable reaches design requirement, stretching measurement equipment is installed, by strain brick and steel strand wires foil gauge
Conducting wire be connected with strain acquirement instrument, and using displacement meter measurement anchor cable anchor head and building enclosure displacement, carry out load test,
Loading procedure is changed using foil gauge, steel strand wires foil gauge and the displacement meter of the strain brick in strain acquirement instrument record anchor cable
Data.
Test method as described above, it is preferable that in step s 102, the foil gauge is pasted along steel strand wires direction, institute
State foil gauge and carry out water-proofing treatment with epoxy resin with connector backing plate, and be wound with gauze.
Test method as described above, it is preferable that in step s 102, the both ends marine glue and adhesive tape of described sleeve pipe are close
Envelope.
Test method as described above, it is preferable that in step s 102, the termination of the conducting wire is carried out with cloth bag or waterproof cloth
Parcel.
Test method as described above, it is preferable that in step s3, the load test loads to be dull, and the dullness adds
Jack at the uniform velocity loads in load, loading speed 100kN/min.
Test method as described above, it is preferable that in step s3, the load test is cyclic load, for surveying
To the stressing influence on neighbouring anchor cable stratum after amount anchor cable stress.
Test method as described above, it is preferable that in step s3, further include and detect internal note using anchor pole detection without damage instrument
The bonding situation of slurry and steel strand wires, wherein on the receiving terminal connection test steel strand wires of the anchor pole detection without damage instrument, profit
Guided wave transmitting is carried out with transmitting terminal, the strain collects instrument and collects the signal that guided wave is propagated in anchor cable.
(3) beneficial effect
The beneficial effects of the invention are as follows：The present invention devises the test that strain brick carries out stress, using straining brick and slip casting
The cooperative transformation of body, studies the stress of injecting cement paste, can the anchoring property of Validity Test prestress anchorage cable, anchor cable steel strand wires
The bond stress distribution of stress distribution and steel strand wires-slip casting body interface, for analysis steel strand wires and injecting cement paste stress distribution and is drilled
Change mechanism provides foundation.
Compared with prior art, the present invention overcomes current conventional measuring methods can only measure anchorage cable anchoring termination, only
Measurement to prestressd anchor cable, the present invention can measure the stress distribution situation of whole anchor cable axis direction, including anchor cable axle power,
Anchor force axial stress and anchorage cable anchoring body interface cohesive force.The steel strand wires used in the present invention have height for common steel strand wires
The characteristics of intensity, underrelaxation, can largely save steel compared with reinforcing bar, and be readily transported and site operation, in addition, body of rod tensioning
When elastic displacement it is big, the loss of prestress and tension variations produced with anchor structure deformation of being crept by stratum is small, is preferably pre-
Stress anchor rod body muscle material, not using expensive intellectual rib, and used sensor, such as strain brick, foil gauge etc., phase
Cheap more for fiber grating, therefore, cost substantially reduces, and can widely use.
Brief description of the drawings
Fig. 1 is strain brick structure schematic diagram；
Fig. 2 is the structure diagram of stretching measurement equipment；
Fig. 3 is strain brick template understructure schematic diagram；
Fig. 4 is strain brick template diaphragm structure schematic diagram；
Fig. 5 is the structure diagram of anchor cable.
【Description of reference numerals】
1：Strain brick；
2：Foil gauge；
3：Joint gasket；
4：Micro pressure box；
5：Conducting wire；
6：Aperture；
7：Wedge；
8：Billet；
9：Force snesor；
10：Jack；
11：Anchorage；
12：Building enclosure；
13：Intermediate plate；
14：Free segment；
15：Anchoring section；
16：Steel strand wires foil gauge；
17：Slurries；
18：Casing.
Embodiment
In order to preferably explain the present invention, in order to understand, below in conjunction with the accompanying drawings, by embodiment, to this hair
It is bright to be described in detail.
Embodiment 1
A kind of prestressed cable anchorage performance testing device, including stretching measurement equipment and anchor cable, anchor cable include strain brick,
Miniature soil pressure cell, foil gauge, more steel strand wires and casing, wherein, the structure of brick is strained as shown in Figure 1, strain brick 1 can be set to
Cuboid, pastes strain respectively in the upper surface of strain brick and one side along three rectangular coordinate system directions of X-axis, Y-axis, Z axis
Piece 2 and joint gasket 3, another side corresponding with one side are equipped with miniature soil pressure cell 4, and miniature soil pressure cell 4, which is connected with, leads
Line 5,2 jointing gasket 3 of foil gauge；Welding lead on joint gasket；That is it is mutually perpendicular to be equipped with two on an upper
A foil gauge 2, is equipped with the 3rd foil gauge perpendicular to the foil gauge of upper surface two, joint gasket is in the side of strain brick 1
For being connected with conducting wire, easy to transmit the data of foil gauge measurement, three apertures 6 are additionally provided with the front of strain brick, aperture is
Used for fixed strain brick.One is taken in more steel strand wires as detection steel strand wires, detection steel strand wires and is connected with foil gauge.
Plane specifically is ground with angle grinder on detection steel strand wires, steel strand wires foil gauge and joint gasket, which are then attached to detection steel, twists
Untill the plane of line, the effect of joint gasket is easy for the welding of two conducting wires of steel strand wires foil gauge.Steel strand wires foil gauge is being examined
The position for surveying steel strand wires is specifically set according to different measurement schemes, can be in the neighbouring cloth of free section of anchor cable and anchoring section boundary
Put it is closeer, to the gradual sparse arrangement in both ends.Needed strain brick using fixation with steel wire on detection steel strand wires according to detection, by steel
Silk can be fixed through 3 holes on strain brick.The setting quantity for straining brick is configured with position according to detection needs.
The conducting wire of all connection foil gauges is combed to steel strand wires termination, casing is sleeved on steel strand wires, and is arranged on the free segment of anchor cable,
Steel strand wires are positioned in the anchor hole of test position, slip casting is carried out using the cement mortar needed for test request, is overflow with anchor hole mouth
Go out the standard that cement mortar terminates as slip casting, be prepared forming anchor pole, at this time, test anchor cable installs, normal maintenance
After can be tested.
Stretching measurement equipment includes wedge, force snesor, jack, displacement meter and strain acquirement instrument, during test, according to such as
Order of connection installation wedge 7, billet 8, force snesor 9, jack 10, anchorage 11, displacement meter, strain acquirement shown in Fig. 2
The tensioning test equipment such as instrument.Specifically, wedge 7 is set close to building enclosure 12, and force snesor 9 connects wedge by billet 8
7, jack 10 connects force snesor 9 by billet 8, and the anchorage 11 of anchor cable connects jack 10 and sets, and the top of anchorage 11 is set
There is intermediate plate 13.Jack 10 is hydraulic jack.
Displacement meter is the displacement for measuring anchor cable anchor head and building enclosure, and displacement meter should be arranged at and stent is firmly fixed
On, foil gauge, miniature soil pressure cell, displacement meter and force snesor connect strain acquirement instrument by conducting wire, and strain acquirement instrument is to use
In the parameter that foil gauge, miniature soil pressure cell, steel strand wires foil gauge, displacement meter and the force snesor of collecting strain brick are surveyed.
Using strain brick in the present invention, cooperative transformation with injecting cement paste, and measuring strain brick three are realized using brick is strained
The parameter of the stress in a direction, the bonding of stress distribution and steel strand wires-slip casting body interface that can be effectively to anchor cable steel strand wires should
Power distribution measures, and can effectively measure the stress distribution of the whole axis direction of anchor cable.
Embodiment 2
When the device of Application Example 1 carries out prestressed cable anchorage performance test, the method used in it includes following step
Suddenly：
The making and installation of S1, sensor
(1) strain brick is prepared：It is that strain bricks die box makes first, for ease of form removal, which is divided into die plate base
As shown in Figure 3 and template partition plate is as shown in Figure 4.Strain brick is for the ease of installing miniature soil pressure cell, to the stress of injecting cement paste
The medium measured, since anchor cable aperture is limited, strain brick size should not be too large, so can be divided whole mold box with side form
It is divided into 9 block sizes and is the region of 40mm × 35mm × 20mm, and is preset with the circular hole of a diameter of 3mm in the direction of the width, and
Before strain brick pours, the steel wire of 3mm is installed with mould.It need to be three-dimensional real by AutoCAD Software on Drawing to strain bricks die box
Body Model, then formed by 3D printer printing and making.
Specific crustal strain brick makes：Die plate base and the template partition plate of straining bricks die box is assembled complete, it is assembled before
Base smears vaseline with partition plate junction, to block slurries and the demoulding.It is closely knit with adhesive waterproof tape winding after assembly, prevent
Only slurries spill and leakage.Strain brick grinding tool box the uniform brushing releasing agent in inner side, by the steel wire (its a diameter of 3mm) of oiling from should
Become in the reserved circular hole of bricks die box and pass through.Pour making strain brick using slip casting raw material, be used for realization and injecting cement paste
Cooperative transformation, form removal after maintenance 3 days, while steel wire is extracted out from strain brick so that each strain brick leaves 3 apertures.
Again in strain brick top surface, that is, upper surface and the direction for pressing three X-axis, Y-axis, Z axis rectangular coordinate systems of side, mutually perpendicular side
To foil gauge and joint gasket is pasted, miniature soil pressure cell is pasted in side, as shown in Figure 1.Upper face paste is X-axis, Y-axis horizontal plane
Both direction, side patch is Z axis vertical direction.It is equipped with 3 aperture effects：Thin wire is penetrated in hole, makes strain
Brick and steel strand wires can securely fix.
(2) steel strand wires foil gauge is installed：, can not be in steel strand wires since steel strand wires are formed by the steel wire winding of 7 strands of 5mm diameters
Surface mount foil gauge, therefore need to polish to steel strand wires with angle grinder in corresponding point position, until grinding and can expire
Untill the plane that sufficient foil gauge (2mm × 3mm) is pasted, to reduce influence of the polishing steel strand wires to Steel Bar Tensile Strength, polishing is wide
Degree is strict controlled in be only capable of putting up foil gauge in the range of.Foil gauge is pasted along steel strand wires direction and connect with 502 viscose glues
Hook plate, and ensure that foil gauge can be completely attached to steel strand wires, improve the accuracy of test result.It will be strained using soldering
Piece and conducting wire are welded to connect on connector backing plate, and the foil gauge for having welded conducting wire is detected with universal meter.Confirm
After conducting wire connection is errorless, water-proofing treatment is carried out to foil gauge and connector backing plate with epoxy resin, is then wound guarantor with gauze
Shield.The strain brick made is fastened in steel strand wires side with wiring, by soldered all conducting wires along steel strand wires one
Lateral free section of anchor cable side combs, and all conducting wires are bound into stock reduces the influence that conducting wire bonds steel strand wires and injecting cement paste.
Since live steel strand wires are exposed steel strand wires, need to free section of anchor cable casing by steel strand wires and injecting cement paste every
From, make between steel strand wires and injecting cement paste can be achieved without frictional slip.Casing is intercepted by design length and penetrates steel strand wires, casing
Both ends marine glue and rubber belt sealing, prevent slurries freedom of entry section.
S2, the installation for testing anchor cable
Test anchor cable and the foil gauge strained on brick and steel strand wires, anchor are installed on a steel strand wires wherein according to test request
Rope point layout schematic diagram can be as shown in figure 5, cloth can be encrypted near 15 intersection of free segment 14 and anchoring section of anchor cable
To put, be gradually thinned out to both ends, steel strand wires foil gauge 16 and strain brick 1 should be arranged in same place location point, wherein, shown in Fig. 4
The middle body of rod is steel strand wires, and in place in each sensor, that is, foil gauge and the installation of miniature soil pressure cell, conducting wire is combed to termination
Afterwards, by test steel strand wires together with common steel strand wires, bandage is wound in anchorage cable anchoring section leading portion, so as to smoothly that steel strand wires are smooth
Penetrate in anchor cable drilling.Conducting wire end application cloth bag etc. is wrapped up, and prevents slurries 17 from causing to damage to conducting wire, and casing 18 is in anchor
The free segment 14 of rope is set.
Test steel strand wires it is ready after, in test position, eye position is calibrated according to predetermined design, according to engineering it is actual and
Test purpose, the soil layer section for selecting to require are carried out drilling and are drilled using jumbolter in eye position, then manually will gently surveyed
Examination steel strand wires are put into hole, and slip casting is carried out using the cement mortar needed for test request, overflow cement mortar as note using aperture
The standard terminated is starched, test anchor cable is installed, conserved.
For grasp field test injecting paste material mechanical property, by live injection slurry make 2 groups of 6 compression strength test blocks into
The performance detection of row compression strength；Test block uses the mortar standard cube test block of length of side 70.7mm, and scene carries out pouring for test block
Build, and according to《Building mortar basic performance tests method standard》(JGJ/T70-2009) test block makes, and form removal and maintenance are marked
Standard is conserved, and test block pressure resistance intensity experiment is carried out according to the time interval of cast in situs to anchorage cable stretching.This compression strength
A part for measuring method as a whole is tested, corresponding mechanical property parameters can be provided for follow-up study, for follow-up
Analysis.
S3, test loading：
After anchor cable conserves 7 days and reaches design requirement, test tensioning can be carried out.Before loading, according to the order of connection of Fig. 2
The tensioning test equipments such as wedge, billet, force snesor, hydraulic jack, anchorage, displacement meter, strain acquirement instrument, tensioning are installed
Hydraulic jack needs to configure hydraulic oil pump, and oil pump is connected by two oil pipes with jack, and one is flowline, one be into
Oil pipe.
Loading procedure can be divided into dull loading and cyclic load.The sensor and steel that will should be strained before loading on brick
The conducting wire of the foil gauge of twisted wire is connected with strain acquirement instrument.Displacement meter should measure the displacement of anchor cable anchor head and building enclosure, displacement
Meter, which should be positioned over, to be firmly fixed on stent.
1. CYCLIC LOADING.The loading characteristic of anchor cable under CYCLIC LOADING is probed into, is grasped under CYCLIC LOADING pattern to neighbouring anchor cable
The stressing influence on stratum.The loading grade and observation time of CYCLIC LOADING such as table 1 carry out, wherein it is desired to it is to be noted that：1st, the 5th
Rate of loading is 100kN/min before circulation, and the rate of loading of the 6th circulation is 50kN/min；2nd, when every grade of loading grade is observed
In, survey read bit and move and should not be less than 3 times；3rd, in every grade of loading grade observation time, when anchor head displacement increment is less than 0.1mm,
Next stage load can be applied, otherwise should extend observation time, until when anchor head displacement increment is less than 2.0mm in 2h, Fang Keshi
Add next stage load.
The loading grade and observation time of 1 CYCLIC LOADING of table
The strain acquirement instrument record loading foil gauge of anchor cable, steel strand wires foil gauge, displacement meter and micro- are utilized in loading procedure
The reading of type soil pressure cell.At displacement meter measurement two, anchor cable position and pile body shifting, are placed on the backing plate after jack,
Pile body shifting is placed on pile body.
2. dullness loading, is mainly used for measuring the stress distribution law in steel strand wires and injecting cement paste, obtain at the uniform velocity adding
The p-s curves of anchor cable during load, and observe the influence that adjacent anchor cable is subject in dull loading procedure.Specifically, jack is at the uniform velocity
Loading, loading speed 100kN/min.Loading procedure utilizes foil gauge, force snesor and the displacement in Acquisition Instrument record anchor cable
Count delta data.At the uniform velocity unload after tensioning, when stretching force is down to 60kN, sense power after voltage stabilizing 2min, completely unloading
Device is removed.
3. in loading procedure, the bonding situation of internal injecting cement paste and steel strand wires is detected using anchor pole detection without damage instrument.Anchor
When bar nondestructive testing instrument measures, receiving terminal need to be put on test steel strand wires, carry out guided wave transmitting using transmitting terminal, utilize strain
Collect instrument and collect the signal that guided wave is propagated in anchor cable.An anchor pole detection without damage data are recorded per 100KN, and after unloading again
Record is once.
4. if test purpose includes probing into anchor cable limit anchoring property, can be loaded according to above-mentioned steps until anchor cable occurs to break
It is bad, the stretching force that abnormal sound occurs for anchor cable is recorded in loading procedure.If without destructive testing, can be completed in stretching measurement
Afterwards, equipment is removed, the tensioning fixation of progress design load after type vibration wire anchor cable axle power meter is changed, so as to measure prestressd anchor cable
Loss.
The locking of anchor cable pulling force refers to stretching force as defined in the top power arrival of jack, and jack carries out off-load, realizes anchor cable
Pulling force locks.The time of anchor cable pulling force locking and locking prestressing force answer accurate recording, the time locked according to anchor cable pulling force, Ying Yu
In one hour of anchor cable locking, every observation in 10 minutes once；2-3 after locking is interior when small, every half an hour observation once；
3-10 after locking is interior when small, is observed once when 1 is small.It is observed in 3 days after anchorage cable stretching locking, after 3 days
It can survey for 1 day 1, until data tend towards stability.
The above described is only a preferred embodiment of the present invention, being not the limitation that other forms are done to the present invention, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Imitate embodiment.But it is every without departing from technical solution of the present invention content, the technical spirit according to the present invention is to above example institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection domain of technical solution of the present invention.
Claims (10)
1. a kind of prestressed cable anchorage performance testing device, it is characterised in that it includes stretching measurement equipment and anchor cable, described
Anchor cable includes multiple strain brick, multiple miniature soil pressure cells, multiple foil gauges, more steel strand wires and casings, wherein, answered described
The upper surface for becoming brick is equipped with orthogonal foil gauge and joint gasket, and vertically foil gauge and joint gasket are equipped with one side,
Corresponding another side is equipped with miniature soil pressure cell, and the foil gauge connects the joint gasket, and the front of the strain brick is
Equipped with three apertures；Multiple foil gauges are connected with wherein one of the more steel strand wires as steel strand wires foil gauge, the steel
For twisted wire as detection steel strand wires, multiple strain bricks need to be fixed on the detection steel strand wires according to measure, it is all it is described should
Become piece and the miniature soil pressure cell is respectively connected with conducting wire, the conducting wire is used to connect stretching measurement equipment, and described sleeve pipe is placed on
The outside of the more steel strand wires, and arranged on the free segment of the anchor cable, the more steel strand wires are placed in anchor hole and pour note
Anchor pole is made in pulp material, and the material of the strain brick is identical with the injecting paste material of anchor pole.
2. test device as claimed in claim 1, it is characterised in that the stretching measurement equipment include wedge, force snesor,
Jack, displacement meter and strain acquirement instrument, the wedge are set close to building enclosure, and the force snesor connects the wedge,
The jack connects the force snesor, and billet, the anchor cable are additionally provided between the jack and the force snesor
Connect jack to set, the displacement meter is used for the displacement for measuring anchor cable anchor head and building enclosure, the foil gauge, miniature soil pressure
Power box, displacement meter and the force snesor connect the strain acquirement instrument.
3. test device as claimed in claim 1 or 2, it is characterised in that it is described strain brick size for 40mm × 35mm ×
20mm, a diameter of 3mm of 3 apertures.
4. a kind of prestressed cable anchorage performance test methods, it is characterised in that it includes the following steps：
The making and installation of S1, sensor
S101, strain brick make：Strain brick is poured using slip casting raw material, the strain brick is cuboid, and the front of cuboid is set
There are three apertures, its upper surface and one side to paste foil gauge respectively mutual vertically along three X-axis, Z axis, Y-axis directions and connect
Head gasket, foil gauge jointing gasket, the another side of corresponding one side are equipped with miniature soil pressure cell, the joint gasket weldering
It is connected to conducting wire；
S102, the installation of steel strand wires foil gauge：Polish a wherein steel strand wires in corresponding point position, strained for connecting
Piece and connector backing plate, the foil gauge are connected by connector backing plate with conducting wire, and conducting wire is along the lateral free section of anchor cable side of steel strand wires one
Comb；
S103, on the steel strand wires of foil gauge are connected with, fixed strain brick, the foil gauge of the strain brick band are needed according to measurement
And the conducting wire of miniature soil pressure cell is combed to free section of anchor cable side；
S2, the installation for testing anchor cable
S201, install the strain brick and steel strand wires foil gauge that the S1 is obtained according to test request on a steel strand wires, by institute
State strain brick and the conducting wire of steel strand wires foil gauge is combed to anchor head, the casing on the free segment set of anchor cable；
The above-mentioned S201 steel strand wires obtained, be put into and need in the anchor hole tested by S202, using the cement bonded sand needed for test request
Slurry carries out slip casting, and when anchor hole mouth overflows cement mortar, slip casting terminates, and installation is complete for test anchor cable；
S3, test loading
After the test anchor cable reaches design requirement, stretching measurement equipment is installed, leading for brick and steel strand wires foil gauge will be strained
Line is connected with strain acquirement instrument, and using the displacement of displacement meter measurement anchor cable anchor head and building enclosure, carries out load test, loading
Process utilizes the foil gauge of the strain brick in strain acquirement instrument record anchor cable, steel strand wires foil gauge and displacement meter change number
According to.
5. test method as claimed in claim 4, it is characterised in that in step s 102, the foil gauge is along steel strand wires side
To stickup, the foil gauge carries out water-proofing treatment with connector backing plate with epoxy resin, and is wound with gauze.
6. test method as claimed in claim 4, it is characterised in that in step s 102, the both ends marine glue of described sleeve pipe
And rubber belt sealing.
7. test method as claimed in claim 4, it is characterised in that in step s 102, the termination cloth bag of the conducting wire or
Waterproof cloth is wrapped up.
8. test method as claimed in claim 4, it is characterised in that in step s3, the load test loads to be dull, institute
State jack in dull loading at the uniform velocity to load, loading speed 100kN/min.
9. test method as claimed in claim 4, it is characterised in that in step s3, the load test adds to move in circles
Carry, for measuring after anchor cable stress to the stressing influence on neighbouring anchor cable stratum.
10. test method as claimed in claim 4, it is characterised in that in step s3, further include and utilize anchor pole detection without damage instrument
The bonding situation of the internal injecting cement paste of detection and steel strand wires, wherein the receiving terminal of the anchor pole detection without damage instrument connects the tested steel
On twisted wire, guided wave transmitting is carried out using transmitting terminal, the strain collects instrument and collects the signal that guided wave is propagated in anchor cable.
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| CN201711278666.3A CN107991189A (en) | 2017-12-06 | 2017-12-06 | A kind of prestressed cable anchorage performance testing device and test method |
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| CN201711278666.3A CN107991189A (en) | 2017-12-06 | 2017-12-06 | A kind of prestressed cable anchorage performance testing device and test method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109898566A (en) * | 2019-01-25 | 2019-06-18 | 中国水利水电科学研究院 | Monitor the New Anchor Cable centering rack of prestress anchorage cable operating status |
| CN111780805A (en) * | 2020-06-05 | 2020-10-16 | 中国葛洲坝集团第一工程有限公司 | Anchor cable type rock mass stress-strain detection system and method |
| CN112989510A (en) * | 2021-02-06 | 2021-06-18 | 浙江大学 | Method for predicting ultimate bonding strength of prestressed anchor cable with anchoring section penetrating through double stratums |
| CN113624123A (en) * | 2021-08-13 | 2021-11-09 | 中国科学院武汉岩土力学研究所 | Three-dimensional strain measurement system based on three-dimensional printing technology and test method thereof |
| CN114812907A (en) * | 2022-06-30 | 2022-07-29 | 四川交达预应力工程检测科技有限公司 | Whole hole detection system and detection method of porous anchor |
| CN115752829A (en) * | 2022-11-24 | 2023-03-07 | 青岛理工大学 | Anchor cable stress monitoring device and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002099390A1 (en) * | 2001-06-06 | 2002-12-12 | Roch Ag | Method for testing the flexural strength of an elongate vertically anchored object |
| CN101672746A (en) * | 2009-10-10 | 2010-03-17 | 河海大学 | System and method for detecting withdrawal resistance of anchoring body |
-
2017
- 2017-12-06 CN CN201711278666.3A patent/CN107991189A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002099390A1 (en) * | 2001-06-06 | 2002-12-12 | Roch Ag | Method for testing the flexural strength of an elongate vertically anchored object |
| CN101672746A (en) * | 2009-10-10 | 2010-03-17 | 河海大学 | System and method for detecting withdrawal resistance of anchoring body |
Non-Patent Citations (3)
| Title |
|---|
| 俞介刚: "《严寒地区混凝土大坝设计、施工与运行》", 31 October 2005 * |
| 刘永权等: "不同类型预应力锚索锚固性能现场试验对比研究", 《岩石力学与工程学报》 * |
| 张四平等: "压力分散型锚杆剪应力分布与现场试验研究", 《重庆建筑大学学报》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109898566A (en) * | 2019-01-25 | 2019-06-18 | 中国水利水电科学研究院 | Monitor the New Anchor Cable centering rack of prestress anchorage cable operating status |
| CN109898566B (en) * | 2019-01-25 | 2020-06-16 | 中国水利水电科学研究院 | Anchor cable centering frame for monitoring running state of prestressed anchor cable |
| CN111780805A (en) * | 2020-06-05 | 2020-10-16 | 中国葛洲坝集团第一工程有限公司 | Anchor cable type rock mass stress-strain detection system and method |
| CN111780805B (en) * | 2020-06-05 | 2022-04-05 | 中国葛洲坝集团第一工程有限公司 | Anchor cable type rock mass stress-strain detection system and method |
| CN112989510A (en) * | 2021-02-06 | 2021-06-18 | 浙江大学 | Method for predicting ultimate bonding strength of prestressed anchor cable with anchoring section penetrating through double stratums |
| CN112989510B (en) * | 2021-02-06 | 2022-04-22 | 浙江大学 | Method for predicting ultimate bonding strength of prestressed anchor cable with anchoring section penetrating through double stratums |
| CN113624123A (en) * | 2021-08-13 | 2021-11-09 | 中国科学院武汉岩土力学研究所 | Three-dimensional strain measurement system based on three-dimensional printing technology and test method thereof |
| CN113624123B (en) * | 2021-08-13 | 2022-08-23 | 中国科学院武汉岩土力学研究所 | Three-dimensional strain measurement system based on three-dimensional printing technology and test method thereof |
| CN114812907A (en) * | 2022-06-30 | 2022-07-29 | 四川交达预应力工程检测科技有限公司 | Whole hole detection system and detection method of porous anchor |
| CN115752829A (en) * | 2022-11-24 | 2023-03-07 | 青岛理工大学 | Anchor cable stress monitoring device and method |
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