CN104763001B - A kind of assay device suitable in anchorage cable anchoring section creep properties and test method - Google Patents
A kind of assay device suitable in anchorage cable anchoring section creep properties and test method Download PDFInfo
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- CN104763001B CN104763001B CN201510190770.1A CN201510190770A CN104763001B CN 104763001 B CN104763001 B CN 104763001B CN 201510190770 A CN201510190770 A CN 201510190770A CN 104763001 B CN104763001 B CN 104763001B
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
Abstract
The invention discloses a kind of assay device suitable in anchorage cable anchoring section creep properties and test method, for filling up the blank of prestressed cable anchorage section creep properties research, disclose the deformation time effect between anchor cable and injecting cement paste cross section, it is proposed to a kind of test method suitable in anchorage cable anchoring section creep properties and assay device.Propose each parameter similarity relation based on Space Axisymmetric balance differential equation, physical equation and geometric equation, and formulate the model test likelihood ratio.Assay device includes prestress anchorage cable (muscle) from top to bottom, loads jack, anchor, rope meter, reaction frame, injecting cement paste, model groove and anchor bolt composition.Monitoring device is by amesdial, and foil gauge forms.This device can not only simulate anchoring section creep test, additionally it is possible to carries out anchor cable (bar) pullout tests.
Description
Technical field
The invention belongs to Geotechnical Engineering field, be specifically related to indoor model test device and the test method thereof of anchor cable creep.
Background technology
Prestressed anchorage technology is because it is little to Rock And Soil disturbance, construction fast, economic dispatch advantage is increasingly becoming the prefered method in side slope consolidation projects, and achieves huge economic benefit and social benefit.This efficient, economic prestressed consolidation technology have also been obtained in other field of civil engineering at present and is widely applied, such as engineerings such as tunnel, ship lock, dam body, underground power house, deep basal pits, and many it are applied to some safe classes as permanent supporting measure and require in higher engineering.But by stress distribution, anchorage technology, the factor such as material mechanical performance and creep affects, prestressd anchor cable can occur loss even to lose efficacy, first three influence factor is unrelated with time effect, Chinese scholars have also been made substantial amounts of experimental study, but the research for creep properties is limited only to the deformation of creep rule under high pre-stress load action to anchoring section surrounding rock body, to the research of interface creep properties between anchoring section anchor cable and injecting cement paste but without carrying out, the present invention fills up the blank of prestressed cable anchorage section creep properties research, disclose the deformation time effect between anchor cable and injecting cement paste interface, a kind of test method suitable in anchorage cable anchoring section creep properties and assay device are proposed.
A kind of nonmetal anti-float anchor rod creep test charger disclosed in the patent that application number is [201310476174.0], although anchor pole can be implemented effective loading by this device, but this device jack after loading completes can not take out, and generally jack originally can produce oil return under long-time load action, namely jack offer counter-force can be more and more less, cause finder charge less than design load, impact test accuracy；Reaction beam adopts I-steel simultaneously, although I-steel bending rigidity is big, but still span centre can be occurred to bend under heavily stressed load action；Furthermore this assay device can only carry out the loading of an anchor cable, and anchor cable creep is a time effect process, and required time is long every time, thus this device to carry out creep test efficiency low.
Summary of the invention
The present invention is the deficiency overcoming prior art theory and experimental study, it is proposed to a kind of test method suitable in prestressed cable anchorage section creep properties and assay device.
The technical solution used in the present invention is as follows:
A kind of assay device suitable in prestressed cable anchorage section creep properties, including a model groove, described model groove include two parallel arrangement of and be vertically and fixedly provided with the device of anchor cable, the strain gauge testing its deformation it is respectively and fixedly provided with two anchor cable ends, one end of two anchor cables is fixed in model groove by injecting cement paste, the other end both passes through the reaction frame being fixed on above model groove, and one of them anchor cable, after reaction frame, it installs a rope meter and anchor bolt；Another anchor cable, after reaction frame, it installs rope meter, punching jack, pressure transducer and anchor bolt.
Described rope meter is fixed on the top of reaction frame by anchor bolt.
Described punching jack is fixed on a jack stand, and described jack stand is fixed on the top of reaction frame.
Described pressure transducer is fixed on the top of jack by anchor bolt.
Described model groove includes two cylindrical cylinders, by being welded to connect integral structure between two cylinders, is reserved with the hole for installing anchoring leading screw in the bottom of each cylinder.
Anchoring leading screw is fixed in the hole of cylinder by described bottom of cylinder bolt, then with epoxy resin, hole is done encapsulation process.
Be provided with two gripper shoes in the both sides of model groove, described gripper shoe is connected with the reaction frame being positioned above.
The top of described model groove is provided with amesdial.
Said apparatus test content includes anchor cable (bar) prestressing force and changes over rule, anchoring section anchor cable (bar) creep, injecting cement paste deformation and free section deformation；Described anchor rod prestress is measured by rope meter, and anchoring section and free segment deformation are by measuring in anchor cable (bar) surface mount strain gauge, and injecting cement paste deformation is by the fixing amesdial measurement of its surface configuration.
The method of testing of said apparatus is as follows:
The step 1 similarity relation according to assay device Yu realistic model, it is determined that each parts；
Model groove and reaction frame are connected into entirety by step 2, and anchoring leading screw is fixed on cylinder by the bottom of cylinder bolt of model groove, with epoxy resin, the hole of bottom of cylinder is done encapsulation process afterwards；
Step 2 heart within the barrel places the anchor cable posting strain gauge, and anchor cable top first passes through anchor bolt and is fixed on reaction frame；
Step 3 builds injecting cement paste in cylinder, and the time that maintenance at the standard conditions sets placed by the model after having built；
After step 4 test piece maintenance is complete, carry out prestressed stretch-draw, reaction frame is sequentially placed firm cushion block, rope meter, lower anchor bolt, jack stand, punching jack, pressure transducer and upper anchor bolt, and the amesdial being used for measuring injecting cement paste displacement is installed at model groove top；
Step 5: first tightened by upper anchor bolt, lower anchor bolt keeps certain distance with backing plate, carries out strain testing, carries out prestressed stretch-draw according to design stress distribution, after reaching design load, tightens lower anchor bolt, prestressing force on unloading punching jack；
Step 6: measure the load on rope meter, and compare with design load, if both differ by more than 100N, stretch-draw again, now increase load during stretch-draw, with offsets anchor time loss of prestress, this process should be repeatedly performed, until meeting design requirement；
Step 7: after completing prestressed stretch-draw, measures strain and the injecting cement paste top displacement of anchoring section anchor cable, then every other day measures a reinforcing bar strain.
Described method of testing is tested content include anchor cable (bar) prestressing force and change over rule, anchoring section anchor cable (bar) creep, injecting cement paste deformation and free section deformation.
Described anchor rod prestress is measured by rope meter, and anchoring section and free segment deformation are by measuring in anchor cable (bar) surface mount strain gauge, and injecting cement paste deformation is by the fixing amesdial measurement of its surface configuration.
In step 1, the defining method of similarity relation is as follows:
For the accuracy of guarantee test result, test model should determine physical dimension according to geometric similarity condition, and formulates corresponding test method according to content of the test, and condition of similarity of the present invention is as follows:
The physical quantity relevant to this test mainly has
In formula: L: physical dimension；ε: strain；δ: deformation；μ: Poisson's ratio；γ: material severe；C: cohesive strength；Angle of friction；E: elastic modelling quantity；σ: stress；T: time.
Subscript " p " represents prototype, and " m " represents model, then prototype and model performance parameter ratio are represented by: All the other basic mechanical performance parameter likelihoods ratio of (meaning of parameters has been given by) material are 1；
In formula:
CL: prototype and the model geometric size likelihood ratio；
CE: prototype and the model elastic modelling quantity likelihood ratio；
Cσ: prototype and model stress similitude ratio；
Ct: prototype and the model time likelihood ratio；
Cγ: prototype and the model severe likelihood ratio；
Lp, Lm: prototype and model geometric size；
EP, Em: prototype and model elastic modelling quantity；
σP, σm: prototype and model stress；
tP, tm: prototype and model time；
γP, γm: prototype and model severe.
Prestress anchorage cable creep test model belongs to Space Axisymmetric structure, prototype Space Axisymmetric balance differential equation:
Model space axial symmetry balance differential equation:
By the likelihood ratioBringing prototype Space Axisymmetric equation into, abbreviation obtains:
Contrast abbreviation equation and model space axial symmetry balance differential equation can draw:
CLCγ=Cσ,
Can draw with reason Three Dimensional Axisymmetric Elasticity geometric equation and physical equation:
CLCε=Cδ, CECε=Cσ
In formula:
Cε: prototype and the model strain likelihood ratio；
Cδ: prototype and the model deformation likelihood ratio；
In the present invention, the anchoring depth likelihood ratio of assay device and master mould takes 1:10；
The time effect likelihood ratio is
Anchor cable diameter, injecting cement paste diameter geometric similarity is than for 1:1；
Anchor cable stress similitude than for 1:10,
The interface deformation likelihood ratio of reinforcing bar and injecting cement paste is 1:10.
Beneficial effects of the present invention:
1. the present invention proposes test method and the test model of a kind of anchoring section creep properties, can be used for testing study on creep properties between prestress anchorage cable (bar) and injecting cement paste cross section, based on condition of similarity, formulates the rational test model basic parameter likelihood ratio.
2. formulate deformation time effect test method between anchoring section creep test injecting cement paste and prestress anchorage cable (bar) interface.
3. model groove of the present invention is splicing structure, except can carrying out the test of prestressed cable anchorage section creep properties, also can study loss of prestress and the failure mechanism experimental study of anchor structure under prestressing force and Bolted Rock Masses creep synergism.The limit resistance to plucking model investigation of prestress anchorage cable (bar) can be carried out simultaneously.
4. this device is the anchorage cable anchoring section creep test under operating mode of the same race, and the anchor cable on left side and right side contrasts parallel test each other, and left side is anchor schematic diagram after prestress application completes, and right side is loading procedure schematic diagram；During test, two anchor cables are implemented the same pretightning force, then test data is acquired, it is possible under equivalent assay conditions, loading result is contrasted, observational error value.
Accompanying drawing explanation
Fig. 1 is anchoring section creep test device front view；
Fig. 2 is anchoring section creep test device graphics；
Fig. 3 is anchor cable pullout tests schematic diagram；
In figure: 1. anchor bolt, 2. pressure transducer, 3. punching jack, 4. jack stand, 5. billet, 6. rope meter, 7. reaction frame, 8. anchor cable, 9. amesdial, 10. cylinder, 11. anchoring leading screws, 12.PVC manages.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical solution of the present invention is remarked additionally further:
A kind of test method suitable in prestressed cable anchorage section creep properties and assay device, assay device includes prestress anchorage cable from top to bottom, loads jack, anchor, rope meter, reaction frame, injecting cement paste, model groove and anchor bolt composition.Monitoring device is by amesdial, and foil gauge forms.
Model groove include two parallel arrangement of and be vertically and fixedly provided with the cylinder 10 of anchor cable, the strain gauge testing its deformation it is respectively and fixedly provided with two anchor cable ends, one end of two anchor cables is fixed in model groove by injection slurry, the other end both passes through the reaction frame 7 being fixed on above model groove, one of them anchor cable 8, after reaction frame 7, it installs a rope meter 6；Another anchor cable 8, after reaction frame 7, it is installing rope meter 6, punching jack 3 and pressure transducer 2；Rope meter 6 is fixed on the top of reaction frame 7 by anchor bolt 1.
Pressure transducer 2 is fixed on the top of jack by anchor bolt.
By being welded to connect integral structure between two cylinders 10, it is reserved with the hole for installing anchoring leading screw 11 in the bottom of each cylinder.
Anchoring leading screw is fixed in the hole of cylinder by bottom of cylinder bolt, then with epoxy resin, hole is done encapsulation process.
Be provided with two gripper shoes in the both sides of model groove, described gripper shoe is connected with the reaction frame being positioned above.
The top of described model groove is provided with amesdial 9.
Prestress anchorage cable (muscle) diameter is between 5～30mm, and prestress anchorage cable is 1～7 bundle, is fixed by anchor head；Prestressing force dowel is bolted, and bottom arranges punching cushion block；
Loading jack is horizontal punching jack 3, and its maximum load counter-force is not less than 300kN, and corresponding rope meter is not less than 300kN；Punching jack 3 is fixed on a jack stand 4, and described jack stand 4 is fixed on the top of reaction frame 7.
Reaction frame 7 material is carbon constructional quality steel, its length is 1m, it is highly 30cm～50cm, beam shape is " work " font, width is 20cm, punches in model groove center position, and aperture is 10～30mm, each reaction frame arranges 3 vertical supporting structures, is connected with bottom model groove by bolt.
Model groove is two cylindrical barrel structures, its material is Q235 common iron, wall thickness is 15～20mm, drum diameter is 30～50cm, it is highly 40～50cm, by being welded to connect integral structure between two cylinders, reserved 4 diameters in bottom are 10～20mm hole, arrange 4 diagonal braces between bottom and cylinder side wall.It is welded to outside cylinder on the steel plate of both sides, is connected with reaction frame by bolt.
Concrete test method is as follows:
1. utilize the device in Fig. 3 first prestress anchorage cable to be carried out pullout tests, specific as follows:
As shown in Figure 3, it is adaptable to the device of prestress anchorage cable pullout tests test, mainly include 10 cylinders and 7 reaction frames, be welded on the steel plate of both sides outside cylinder 10, be connected with reaction frame 7 by bolt.Bottom cylinder 10, reserved 4 diameters are 10～20mm hole, are used for disposing 11 anchoring leading screws；Experimental technique is as follows:
First step 1 should be passed through bolt and cylinder 9 and reaction frame 7 are connected into entirety, is fixed on cylinder 10 with bolt by anchoring leading screw 11, with epoxy resin, 4 holes bottom cylinder 10 is done encapsulation process afterwards bottom cylinder 10；
After step 2 anchors leading screw 11 installation, place pvc pipe 12, bottom epoxy sealing in center, and build and around simulate rock mass；
After step 3 treats that simulation rock mass reaches some strength, take out pvc pipe 12, place the anchor cable (bar) 8 posting strain gauge at cylinder 10 center, for ensureing that body not necessarily departs from center, anchor cable (bar) 8 top should first pass through anchor bolt 1 and be fixed on reaction frame 7；
Step 4 builds injecting cement paste in cylinder 10, and injecting cement paste height is 40cm, and the model after having built should be placed under standard conditions (constant temperature, constant humidity) maintenance 28 days.
Step 5 test piece maintenance to after 28, carrying out anchor cable (bar) 8 pullout tests, punching jack 3, pressure transducer 3 and upper anchor bolt 1, anchor bolt 1 should first be tightened, and installs thousand point 9 for measuring injecting cement paste displacement and anchor pole displacement.
Before step 5 stretch-draw, first carry out strain testing, and carry out pullout tests according to CYCLIC LOADING method.
2. utilize device described as shown in Figure 1, Figure 2 to carry out prestressed cable anchorage section creep model experimental study
As shown in Figure 1 and Figure 2, it is adaptable to the assay device of prestressed cable anchorage section creep properties, mainly include 10 cylinders and 7 reaction frames, be welded on the steel plate of both sides outside cylinder 10, be connected with reaction frame 7 by bolt.Bottom cylinder 10, reserved 4 diameters are 10～20mm hole, are used for disposing 11 anchoring leading screws, and concrete test procedure is as follows:
First step 1. should be passed through bolt and cylinder 9 and reaction frame 7 are connected into entirety, is fixed on cylinder 10 with bolt by anchoring leading screw 11, with epoxy resin, 4 holes bottom cylinder 10 is done encapsulation process afterwards bottom cylinder 10；
After step 2. anchors leading screw 11 installation, placing the anchor cable (bar) 8 posting strain gauge at cylinder 10 center, for ensureing that body not necessarily departs from center, anchor cable (bar) 8 top should first pass through anchor bolt 1 and be fixed on reaction frame 7；
Step 3. builds injecting cement paste in cylinder 10, and injecting cement paste height is 40cm, and the model after having built should be placed under standard conditions (constant temperature, constant humidity) maintenance 28 days.
Step 4. test piece maintenance, to after 28, carrying out prestressed stretch-draw, successively places firm cushion block 5 on reaction frame 7, rope meter 7, lower anchor bolt 1, jack stand 4, punching jack 3, pressure transducer 3 and upper anchor bolt 1 also install amesdial 9 for measuring injecting cement paste displacement.
Upper anchor bolt 1 is first tightened by step 5., and lower anchor bolt 1 keeps certain distance with backing plate 5, before stretch-draw, should first carry out strain testing, carry out prestressed stretch-draw according to design stress distribution, after reaching design load, tighten lower anchor bolt 1, prestressing force on unloading punching jack 3.
Step 6. measures the load on rope meter 5, and compares with design load, if both differ by more than 100N, stretch-draw again should be carried out, now should increase load during stretch-draw, with offset anchoring time loss of prestress, this process should be repeatedly performed, until meeting design requirement.
After step 7. completes prestressed stretch-draw, measure the strain of anchoring section reinforcing bar and injecting cement paste top displacement, every other day measure a reinforcing bar strain later.
In step 1, the defining method of similarity relation is as follows:
For the accuracy of guarantee test result, test model should determine physical dimension according to geometric similarity condition, and formulates corresponding test method according to content of the test, and condition of similarity of the present invention is as follows:
The physical quantity relevant to this test mainly has
In formula: L: physical dimension；ε: strain；δ: deformation；μ: Poisson's ratio；γ: material severe；C: cohesive strength；Angle of friction；E: elastic modelling quantity；σ: stress；T: time.
Subscript " p " represents prototype, and " m " represents model, then prototype and model performance parameter ratio are represented by: All the other basic mechanical performance parameter likelihoods ratio of (meaning of parameters has been given by) material are 1；
In formula:
CL: prototype and the model geometric size likelihood ratio；
CE: prototype and the model elastic modelling quantity likelihood ratio；
Cσ: prototype and model stress similitude ratio；
Ct: prototype and the model time likelihood ratio；
Cγ: prototype and the model severe likelihood ratio；
Lp, Lm: prototype and model geometric size；
EP, Em: prototype and model elastic modelling quantity；
σP, σm: prototype and model stress；
tP, tm: prototype and model time；
γP, γm: prototype and model severe.
Prestress anchorage cable creep test model belongs to Space Axisymmetric structure, prototype Space Axisymmetric balance differential equation:
Model space axial symmetry balance differential equation:
By the likelihood ratioBringing prototype Space Axisymmetric equation into, abbreviation obtains:
Contrast abbreviation equation and model space axial symmetry balance differential equation can draw:
CLCγ=Cσ,
Can draw with reason Three Dimensional Axisymmetric Elasticity geometric equation and physical equation:
CLCε=Cδ, CECε=Cσ
In formula:
Cε: prototype and the model strain likelihood ratio；
Cδ: prototype and the model deformation likelihood ratio.
The specific embodiment of the present invention is described in conjunction with accompanying drawing although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme, those skilled in the art need not pay various amendments or deformation that creative work can make still within protection scope of the present invention.
Claims (9)
1. the test method being applicable to anchorage cable anchoring section creep properties, the assay device that wherein this test method adopts, including a model groove, described model groove include two parallel arrangement of and be vertically and fixedly provided with the device of anchor cable, be respectively and fixedly provided with the strain gauge testing its deformation two anchor cable ends, one end of two anchor cables is fixed in model groove by injection slurry, and the other end both passes through the reaction frame being fixed on above model groove, one of them anchor cable, after reaction frame, it installs a rope meter；Another anchor cable, after reaction frame, it installs rope meter, punching jack and pressure transducer；It is characterized in that, test method is as follows:
The step 1 similarity relation according to experimental provision Yu realistic model, it is determined that each parts；
Model groove and reaction frame are connected into entirety by step 2, and anchoring leading screw is fixed on cylinder by the bottom of cylinder bolt of model groove, with epoxy resin, the hole of bottom of cylinder is done encapsulation process afterwards；
Step 2 heart within the barrel places the anchor cable posting strain gauge, and anchor cable top first passes through anchor bolt and is fixed on reaction frame；
Step 3 builds injecting cement paste in cylinder, and the time that maintenance at the standard conditions sets placed by the model after having built；
After step 4 test piece maintenance is complete, carry out prestressed stretch-draw, reaction frame is sequentially placed steel cushion block, rope meter, lower anchor bolt, jack stand, punching jack, pressure transducer and upper anchor bolt, and the amesdial being used for measuring injecting cement paste displacement is installed at model groove top；
Step 5: first tightened by upper anchor bolt, lower anchor bolt keeps certain distance with backing plate, carries out strain testing, carries out prestressed stretch-draw according to design stress distribution, after reaching design load, tightens lower anchor bolt, prestressing force on unloading punching jack；
Step 6: measure the load on rope meter, and compare with design load, if both differ by more than 100N, stretch-draw again, now increase load during stretch-draw, with offsets anchor time loss of prestress, this process should be repeatedly performed, until meeting design requirement；
Step 7: after completing prestressed stretch-draw, measures strain and the injecting cement paste top displacement of anchoring section anchor cable, then every other day measures a reinforcing bar strain.
2. test method as claimed in claim 1, it is characterised in that: described rope meter is fixed on the top of reaction frame by anchor bolt.
3. test method as claimed in claim 1, it is characterised in that: described punching jack is fixed on a jack stand, and described jack stand is fixed on the top of reaction frame.
4. test method as claimed in claim 1, it is characterised in that: described pressure transducer is fixed on the top of jack by anchor bolt.
5. test method as claimed in claim 1, it is characterised in that: described model groove includes two cylindrical cylinders, by being welded to connect integral structure between two cylinders, is reserved with the hole for installing anchoring leading screw in the bottom of each cylinder.
6. test method as claimed in claim 5, it is characterised in that: anchoring leading screw is fixed in the hole of cylinder by described bottom of cylinder bolt, then with epoxy resin, hole is done encapsulation process.
7. test method as claimed in claim 1, it is characterised in that: be provided with two gripper shoes in the both sides of model groove, described gripper shoe is connected with the reaction frame being positioned above.
8. test method as claimed in claim 1, it is characterised in that: the top of described model groove is provided with amesdial.
9. test method as claimed in claim 1, it is characterised in that: the similarity relation of described assay device and realistic model is: CLCγ=Cσ, CLCε=Cδ, CECε=Cσ；
Wherein: CL: prototype and the model geometric size likelihood ratio；CE: prototype and the model elastic modelling quantity likelihood ratio；Cσ: prototype and model stress similitude ratio；Ct: prototype and the model time likelihood ratio；Cγ: prototype and the model severe likelihood ratio, Cε: prototype and the model strain likelihood ratio；Cδ: prototype and the model deformation likelihood ratio.
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| CN107679318A (en) * | 2017-09-28 | 2018-02-09 | 中国航空工业集团公司西安飞机设计研究所 | A kind of aircraft thin-wall construction posting characteristic becomes material model test design method |
| CN110631909A (en) * | 2019-09-19 | 2019-12-31 | 河南理工大学 | Reverse anchor rock complex anchor rod working creep drawing characteristic test method |
| CN110747912B (en) * | 2019-10-29 | 2021-05-04 | 中国石油大学(华东) | Model test device for coupling effect of anchoring force loss of prestressed anchor rod and side slope aging deformation |
| CN110849688B (en) * | 2019-11-29 | 2023-05-16 | 中国石油大学(华东) | Model test device for coupling effect of prestress anchor rod (cable) anchoring force loss and tunnel aging deformation |
| CN113295527B (en) * | 2021-05-24 | 2022-12-09 | 燕山大学 | Device for measuring stress relaxation of fiber reinforced composite bar and measuring method thereof |
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| CN100582390C (en) * | 2008-08-18 | 2010-01-20 | 山东大学 | Miniature pre-stress anchor wire used for model experiment and its burying and loading method |
| EP2248951B1 (en) * | 2009-05-08 | 2014-01-15 | Lechner, Peter | Method and device for determining the axial force progression in a pressure-grouted anchor |
| CN202073125U (en) * | 2011-04-02 | 2011-12-14 | 河海大学 | Detecting device for upright resistance of anchorage body |
| CN103510552B (en) * | 2013-10-12 | 2015-12-02 | 青岛理工大学 | A kind of nonmetal anti-float anchor rod creep test charger |
| CN204530800U (en) * | 2015-04-21 | 2015-08-05 | 山东大学 | A kind of experimental rig being applicable to anchorage cable anchoring section creep properties |
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