CN102213660B - Concrete constant-tension holding and composite corrosion test device - Google Patents
Concrete constant-tension holding and composite corrosion test device Download PDFInfo
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- CN102213660B CN102213660B CN 201010161085 CN201010161085A CN102213660B CN 102213660 B CN102213660 B CN 102213660B CN 201010161085 CN201010161085 CN 201010161085 CN 201010161085 A CN201010161085 A CN 201010161085A CN 102213660 B CN102213660 B CN 102213660B
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- 239000002131 composite material Substances 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
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- 229910000926 A-3 tool steel Inorganic materials 0.000 description 1
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- 229910000831 Steel Inorganic materials 0.000 description 1
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- 238000009864 tensile test Methods 0.000 description 1
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Abstract
The invention relates to a long-term tensile load and composite corrosion test device. The invention relates to a concrete constant-tension load-bearing and composite corrosion test device which comprises a base, wherein stand columns are arranged on the base at intervals, the stand columns sequentially penetrate through a bearing plate and a limiting plate, and the bearing plate and the limiting plate are fixed on the stand columns through nuts; a spring is arranged between the bearing plate and the limiting plate and sleeved on the upright post; a test piece is arranged between the base and the bearing plate, a connecting rod is embedded in the test piece, and the connecting rod is respectively fixed on the upper spherical hinge connecting plate and the lower spherical hinge connecting plate; the upper spherical hinge pull rod sequentially penetrates through the upper spherical hinge connecting plate, the supporting plate and the limiting plate, and is fixed on the limiting plate through a nut; the lower spherical hinge pull rod sequentially penetrates through the lower spherical hinge connecting plate and the base, and is fixed on the base through a nut. The constant-tension carrying device has the advantages of simple and portable structure, convenient operation and easy load application and control; the test piece can be kept at a stable load level for a long time.
Description
Technical field
The present invention relates to a kind of clamping device, relate in particular to a kind of long-term stretching and hold and carry and the composite corrosion test device.
Background technology
For a long time, people lay particular emphasis on its compressive property to the research of mechanical performance of concrete more, and pay close attention to relatively less to the research of its tensile property.In fact, concrete tensile property plays conclusive effect to the security of xoncrete structure, and the destruction of xoncrete structure is that the deficiency owing to concrete tensile strength causes after all.Especially, such as works such as cylindrical shape reinforced concrete storage bin, water towers, bearing for a long time the effect of hoop tension, its design is often directly controlled by the hoop resistance to tension.Therefore, the research tool of the long-term tensile property of concrete is of great significance.
Simultaneously, xoncrete structure in the process, except bearing certain load, also faces the impact of corrosive medium under arms inevitably.Thereby its truth must be load action and corrosive medium is dual or the multiple factors coupling under the damage failure procedure.Domestic and international existing studies show that, the existence of load can have influence on the deteriorated process of permanance of xoncrete structure to a great extent.
Traditional Analysis of Concrete Tensile test method has three kinds: split and draw test, axis pulling experiment and bending test.Wherein, axis pulling experiment is the most basic test method, and measured stress, strain value corresponding relation are clear and definite, therefore can measure directly, exactly the constitutive behavior of material.On the other hand, because the test specimen failure mode is simple, failure criteria is easy to grasp, and is convenient to carry out the analysis of concrete damage mechanism.But the shortcoming of axis pulling experiment be to test specimen make and testing equipment have relatively high expectations the test operation complexity.In long-term corrosion test, how concrete is applied axle and draw load, and the overall process of grasp concrete deterioration damage is the difficult point of Study on Problems.Because testing equipment lacks and technical requirement is higher, current similar test result is also rare, and particularly the concrete stress investigation corrosion adopts bending test to replace axis pulling experiment more.
Such as disclosed Chinese patent application on March 18th, 2009, publication number is CN101387634A, and it discloses uniaxial drawing loading and the method for testing of concrete carbonizing performance under a kind of tension.There is following defective in this device: (1) load applies and controls difficulty; (2) sample dimensions, form are single, and a sleeve spring can only adapt to the test specimen of respective length; (3) pre embedded bolt is directly fixed between the lower steel plate, is difficult to realize that axle draws; (4) be difficult in the situation that do not corrode the axle that charger is used for the liquid corrosion medium and draw-corrosion test.
Such as disclosed Chinese patent application on September 24th, 2008, publication number is CN101271103A, it discloses concrete multi-factors durability experimental device under a kind of tension and the environment acting in conjunction, the bottom of its pull bar is connected with lower pulling plate, arm-tie and limiting plate are passed in the top of pull bar, upper arm-tie is through on the pull bar to be fixed by set nut, nut is pressed in strain gauge on the limiting plate by cone worm, spring housing is being provided with tensioning chuck, lower tensioning chuck on the cone worm and between limiting plate and arm-tie between upper arm-tie and the lower pulling plate.Distance is fixing between this device, can not adapt to the requirement of different test specimen length, and its shape, size are fixed, can not adapt to the variation of different Specimen Shapes, in the corrosion test, instrument directly immerses corrosive medium, the instrument life-span is on the hazard, even if employing stainless steel material, corrosion are still unavoidable, also can affect and hold the effect of carrying.
Summary of the invention
Technique effect of the present invention can overcome defects, providing a kind of concrete constant stretch to hold carries and the composite corrosion test device, it is simple in structure, can keep for a long time constant axial tension, draw concrete mechanics damage and evolutionary process under the load action for studying long-term axle, and long-term axle draws load and the cooperation of corrosion environment lotus root to provide reliable test unit with lower concrete endurance issues.
For achieving the above object, the present invention adopts following technical scheme: it comprises base, and the interval arranges column on the base, and column runs through support plate and limiting plate successively, and support plate and limiting plate are fixed on the column by nut; Be provided with spring between support plate and the limiting plate, spring housing is on column; Be provided with test specimen between base and the support plate, pre-buried connecting link on the test specimen, connecting link are separately fixed on the upper and lower ball pivot web joint; Upper ball pivot pull bar runs through ball pivot web joint, support plate, limiting plate successively, and upper ball pivot pull bar is fixed on the limiting plate by nut; Lower ball pivot pull bar runs through lower ball pivot web joint, base successively, and lower ball pivot pull bar is fixed on the base by nut.
By pressing machine or lifting jack and the reaction frame application of force, the application of force is easy.Be out of shape by fixing spacing, the Compress Spring of nut test specimen is applied long duration load, by the stabilizing distance between support plate and the limiting plate, guarantee the pulling force of test specimen laxly, make stress value stable, thereby improve the reliability of test findings.
It is the key that guarantees the axis pulling experiment effect that axle draws safeguard measure, this device mainly arranges respectively by the upper/lower terminal at test specimen and connects ball pivot (being comprised of ball pivot pull bar and ball pivot web joint), the ball pivot pull bar is provided with the ball-shaped end of expansion, the ball pivot web joint is provided with corresponding spherical female slotted eye, the ball pivot pull bar passes the ball pivot web joint and transmits axial tension during test, and guarantees that by the ball pivot effect reliable axle draws effect.For the test specimen of different size, can adjust by the size of adjusting the ball pivot web joint and the hole location that links to each other with the pre-buried connecting link of test specimen.Pre-buried connecting link makes power transmission more even.
In addition, also should be by pasting foil gauge in three sides of test specimen except the face of building during test, the axial property effect that applies in order to further check load by the load that adds in advance 10%-20%.
Carry a test unit as holding for a long time, the problem of most critical is how load to be remained on suitable level and in time passing is lax not excessive.So through relatively proving, spiral compression spring has been selected in design.The internal diameter of four selected identical springs is enclosed within respectively on four root posts than the slightly larger in diameter of column.Adopt four springs, make load-bearing capacity higher.The design parameter of spring is determined according to needs, can according to the requirement of test to load, carry out suitable adjustment.
Support plate can move up and down along column, its role is to according to the height control of test specimen and the position of fixing spring.
Establish the hole on base and the limiting plate, its slightly larger in diameter is in the diameter of upper ball pivot pull bar, keeps supplying that the ball pivot pull bar passes and fixing.
Test specimen is arranged in the rubber sleeve, and rubber sleeve upper/lower terminal face connects, and the upper/lower terminal of rubber sleeve is tightly connected with test specimen respectively; Rubber sleeve is provided with water inlet and water delivering orifice.
Because whole device is more convenient, can finish in conjunction with existing testing equipment for the simulation of corrosion environment under the general atmosphere condition, puts into carbonization case or environmental simulation test case etc. such as the Whole Equipment that test specimen will be housed.For the stress corrosion (cracking) test under the liquid corrosion media environment, this device can be equipped with special attachment device rubber sleeve, be convenient to and test specimen between sealing.The upper and lower parts of rubber sleeve are respectively equipped with water inlet and water delivering orifice, are convenient to filling and the replacing of etchant solution in the test of long duration process.Test specimen cooperates with rubber sleeve, is adopted as dumb-bell shape.
Column and ball pivot pull bar all adopt finish rolling deformed bar, and other adopt the A3 steel of processing through tone pitch, can reduce cost, effectively reduce stress relaxation.
Constant stretch of the present invention holds that to carry device construction simple, light, easy to operate, and load applies and controls easily; Can make the load level of test specimen stable for extended periods of time; Can be reduced to minimum degree to the impact of installing itself in the corrosion test, for studying concrete mechanical characteristic under the long-term constant uniaxial tension load action (to consider the time factor impact of concrete damage process), and long-term constant uniaxial tension load damages deterioration process with the cooperation of corrosion environment lotus root with lower concrete permanance reliable experimental provision and test method is provided.
Description of drawings
Below in conjunction with the drawings and specific embodiments this device is described in detail:
Fig. 1 is contour structures front schematic view of the present invention;
Fig. 2 is contour structures side schematic view of the present invention;
Fig. 3 is rubber sleeve structural representation of the present invention.
Embodiment
This device comprises base 1, and the interval arranges four root posts 2 on the base 1, and column 2 runs through support plate 3 and limiting plate 4, and support plate 3 is fixed on the column 2 by nut 5 with limiting plate 4; Be provided with spring 6 between support plate 3 and the limiting plate 4, spring 6 is enclosed within on the column 2; Be provided with test specimen 7 between base 1 and the support plate 3, pre-buried connecting link 8 on the test specimen 7, connecting link 8 are separately fixed on ball pivot web joint 9, the lower ball pivot web joint 10; Upper ball pivot pull bar 11 runs through ball pivot web joint 9, support plate 3, limiting plate 4 successively, and upper ball pivot pull bar 11 is fixed on the limiting plate 4 by nut 5; Lower ball pivot pull bar 12 runs through lower ball pivot web joint 10, base 1 successively, and lower ball pivot pull bar 12 is fixed on the base 1 by nut 5.
This device can be according to testing requirements, satisfies mechanical property research and load and the environmental factor lotus root of concrete sample under long-term uniaxial tension effect and closes endurancing needs under the factor effect.
Load application: loading procedure can be by means of existing pressure testing machine or lifting jack and reaction frame.At first, bring pressure to bear on evenly, evenly limiting plate by pressing machine or lifting jack, until pressure reaches the numerical value of testing requirements.Tighten rapidly the nut 5 of ball pivot pull bar 11 tops and limiting plate 4, so that the pressure reading on pressing machine or the lifting jack reverts to 0.So, just be transformed into upper ball pivot pull bar 11 with the pulling force of the identical value of pressure, and further put on test specimen 7.At this moment, should in time record corresponding strain value.Loaded should be placed 24 hours at least, changed greatly such as reading strain, should in time be adjusted, and the stabilizing distance between Accurate Measurement support plate 3 and the limiting plate 4.In the test of long duration process, the distance between periodic measurement limiting plate 4 and the support plate 3 by adjusting the size of the nut pulling force on the upper ball pivot pull bar 11, makes its maintenance constant in real time.
Test method:
Loaded, can carry out the test of following several respects:
(1) uniaxial tension long-term performance test
Originally hold a year device and cooperate existing distortion or strain detection testing device, can carry out the research of the aspects such as CONCRETE CONSTITUTIVE RELATIONSHIP of long-term strength, Creep Characteristics and consideration time factor under the effect of the long-term constant single shaft pulling force of concrete.
(2) axle draws load-carbonization coupling test
Originally hold year device volume little, lightweight.Whole test unit can be placed the carbonization case, carry out long-term axle and draw experimental Study on Carbonization of Concrete under the load action, namely axle draw-cooperation of carbonization lotus root studies with lower concrete durability.
(3) axle draws load-corrosive liquids coupling test
Special coupling test attachment device rubber sleeve 13 is enclosed within bears dumbbell shape test specimen 7 outsides that one-way shaft is drawn load, suitably adopt sealant sealing at two ends up and down, and adopt supporting hoop banding.Guaranteeing under the prerequisite of good seal, inject corrosive liquids (such as chloride solution, sulfate liquor etc.) from water inlet 14, utilize the cavity between dumbbell shape test specimen 7 and the rubber sleeve 13 that test specimen is fully immersed in the etchant solution, realize that long-term axle draws the lotus root cooperation of load and etchant solution to use.Avoid simultaneously etchant solution and held contacting of year instrument.
Claims (3)
1. a concrete constant stretch is held and is carried and the composite corrosion test device, it is characterized in that, comprise base, the interval arranges column on the base, and column runs through support plate and limiting plate successively, and support plate and limiting plate are fixed on the column by nut; Be provided with spring between support plate and the limiting plate, spring housing is on column; Be provided with test specimen between base and the support plate, pre-buried connecting link on the test specimen, connecting link are separately fixed on the upper and lower ball pivot web joint; Upper ball pivot pull bar runs through ball pivot web joint, support plate, limiting plate successively, and upper ball pivot pull bar is fixed on the limiting plate by nut; Lower ball pivot pull bar runs through lower ball pivot web joint, base successively, and lower ball pivot pull bar is fixed on the base by nut.
2. concrete constant stretch according to claim 1 is held and is carried and the composite corrosion test device, it is characterized in that, test specimen is arranged in the rubber sleeve, and rubber sleeve upper/lower terminal face connects, and the upper/lower terminal of rubber sleeve is tightly connected with test specimen respectively; Rubber sleeve is provided with water inlet and water delivering orifice.
3. concrete constant stretch according to claim 2 is held and is carried and the composite corrosion test device, it is characterized in that, test specimen is dumb-bell shape.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010161085 CN102213660B (en) | 2010-04-12 | 2010-04-12 | Concrete constant-tension holding and composite corrosion test device |
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| CN 201010161085 CN102213660B (en) | 2010-04-12 | 2010-04-12 | Concrete constant-tension holding and composite corrosion test device |
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| CN102213660A CN102213660A (en) | 2011-10-12 |
| CN102213660B true CN102213660B (en) | 2013-05-01 |
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