CN102213660A - Concrete constant stretch holding and composite corrosion testing device - Google Patents

Concrete constant stretch holding and composite corrosion testing device Download PDF

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Publication number
CN102213660A
CN102213660A CN 201010161085 CN201010161085A CN102213660A CN 102213660 A CN102213660 A CN 102213660A CN 201010161085 CN201010161085 CN 201010161085 CN 201010161085 A CN201010161085 A CN 201010161085A CN 102213660 A CN102213660 A CN 102213660A
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China
Prior art keywords
ball pivot
base
test
test specimen
fixed
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CN 201010161085
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Chinese (zh)
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CN102213660B (en
Inventor
赵铁军
姜福香
王玉田
F·H·维特曼
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青岛理工大学
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Abstract

The invention relates to a long-term stretch holding and composite corrosion testing device, in particular to a concrete constant stretch holding and composite corrosion testing device, which comprises a base, wherein stand columns are arranged on the base at intervals; the stand columns pass through a bearing plate and a limit plate sequentially; the bearing plate and the limit plate are fixed on the stand columns by nuts; springs are arranged between the bearing plate and the limit plate and are sleeved on the stand columns; a test piece is arranged between the base and the bearing plate; a connecting rod is pre-buried on the test piece and is fixed on upper and lower spherical hinge connecting plates respectively; an upper spherical hinge pull rod passes through the upper spherical hinge connecting plate, the bearing plate and the limit plate sequentially and is fixed on the limit plate by nuts; and a lower spherical hinge pull rod passes through the lower spherical hinge connecting plate and the base sequentially and is fixed on the base by the nuts. The constant stretch holding device is simple and portable in a structure and convenient to operate, and loads are easy to apply and control; and the test piece can be in the stable load level for a long time.

Description

The concrete constant stretch is held and is carried and the composite corrosion test device
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 less relatively to the research of its tensile property.In fact, concrete tensile property is to the security decisive role of xoncrete structure, and the destruction of xoncrete structure is that the deficiency owing to concrete tensile strength causes after all.Especially, as works such as cylindrical shape reinforced concrete storage bin, water towers, bearing the effect of hoop tension for a long time, its design is often directly controlled by the hoop resistance to tension.Therefore, the research of the long-term tensile property of concrete has crucial meaning.
Simultaneously, xoncrete structure in the process, except bearing certain load, also faces the influence of corrosive medium under arms inevitably.Thereby its truth must be the Damage and Failure process under load action and the dual or multiple factor coupling of corrosive medium.Domestic and international existing studies show that, the existence of load can have influence on the permanance deterioration process of xoncrete structure to a great extent.
Traditional concrete stretching 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, so can measure this structure behavior of material directly, exactly.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 concrete damage Mechanism analysis.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.
As disclosed Chinese patent application on March 18th, 2009, publication number is CN101387634A, and it discloses the uniaxial tension charger 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) axle that is difficult to be used for the liquid corrosion medium under the situation of not corroding charger draws-corrosion test.
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, last 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 the chuck that stretches, following stretching chuck on the cone worm and between limiting plate and arm-tie between last arm-tie and the lower pulling plate.Fixed distance between this device, can not adapt to the requirement of different test specimen length, and its shape, fixed size, can not adapt to the variation of different test 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 influence and hold the effect of carrying.
Summary of the invention
Technique effect of the present invention can overcome above-mentioned defective, providing a kind of concrete constant stretch to hold carries and the composite corrosion test device, it is simple in structure, can keep constant axial tension for a long time, draw concrete mechanics damage and evolutionary process under the load action for studying long-term axle, and long-term axle draw load and the cooperation of corrosion environment lotus root with under concrete endurance issues reliable test unit is provided.
For achieving the above object, the present invention adopts following technical scheme: it comprises base, at interval column is set 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; Last ball pivot pull bar runs through ball pivot web joint, support plate, limiting plate successively, and last ball pivot pull bar is fixed on the limiting plate by nut; Following ball pivot pull bar runs through ball pivot web joint, base down successively, and following ball pivot pull bar is fixed on the base by nut.
By pressing machine or the lifting jack and the reaction frame application of force, the application of force is easy.Be out of shape by fixing spacing, the compression spring of nut test specimen is applied long duration load,, guarantee the pulling force of test specimen laxly, make stress value stable, thereby improve the reliability of test findings by the stabilizing distance between support plate and the limiting plate.
It is the key that guarantees the axis pulling experiment effect that axle draws safeguard measure, this device mainly is provided with respectively by the upper/lower terminal at test specimen and connects ball pivot (being made up 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 axle draws effect reliably.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 on three sides except that the face of building on the test specimen during test, the axial property effect that applies in order to further check load by the load that adds 10%-20% in advance.
Carry a test unit as holding for a long time, the problem of most critical is how load to be remained on proper level and in time passing is lax not excessive.So through relatively proving, spiral compression spring has been selected in design for use.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 concrete parameter of spring is determined according to needs, can carry out suitable adjustment according to the requirement of test to the load size.
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 last 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. as the equipment integral 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 position of rubber sleeve is respectively equipped with water inlet and water delivering orifice, is convenient to the 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 handling 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 influence 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 influence of concrete damage process), and long-term constant uniaxial tension load provides reliable experimental provision and test method with the cooperation of corrosion environment lotus root with descending concrete permanance to damage deterioration process.
Description of drawings
Below in conjunction with the drawings and specific embodiments this device is done detailed description:
Fig. 1 is a contour structures front schematic view of the present invention;
Fig. 2 is a contour structures side schematic view of the present invention;
Fig. 3 is a rubber sleeve structural representation of the present invention.
Embodiment
This device comprises base 1, and four root posts 2 are set on the base 1 at interval, 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 following ball pivot web joint 10; Last ball pivot pull bar 11 runs through ball pivot web joint 9, support plate 3, limiting plate 4 successively, and last ball pivot pull bar 11 is fixed on the limiting plate 4 by nut 5; Following ball pivot pull bar 12 runs through ball pivot web joint 10, base 1 down successively, and following ball pivot pull bar 12 is fixed on the base 1 by nut 5.
Test specimen 7 is arranged in the rubber sleeve 13, and rubber sleeve 13 upper/lower terminal faces connect, and the upper/lower terminal of rubber sleeve 13 is tightly connected with test specimen 7 respectively; Rubber sleeve 13 is provided with water inlet 14 and water delivering orifice 15.Test specimen 7 is a dumb-bell shape.
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.
Test specimen 7 is installed: ball pivot web joint and test specimen 7 are connected firmly by pre-buried connecting link 8 and ball pivot pull bar, and following ball pivot pull bar 12 passes down the recess hole of ball pivot web joint 10.To descend ball pivot pull bar 12 secure fixation in base 1 with bolt, adjust support plate 3, and will go up ball pivot pull bar 11 with bolt and be fixed in limiting plate 4 to correct position.Foil gauge with being pasted on three sides except that the face of building on the test specimen 7 links to each other with strainmeter, adds the load of 10%-20% in advance, by reading strain value, whether reach the effect of axially loaded in order to further check, otherwise, further adjust and go up ball pivot pull bar 11 until realizing that axle draws.
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 limiting plate evenly, evenly, reach the numerical value of testing requirements until pressure by pressing machine or lifting jack.Tighten the nut 5 of ball pivot pull bar 11 tops and limiting plate 4 rapidly, make that the pressure reading on pressing machine or the lifting jack reverts to 0.So, just be transformed into last 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 write down corresponding strain value.Loaded should be placed 24 hours at least, changed greatly as reading strain, should in time be adjusted, and accurately measure stabilizing distance between 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 that goes up the nut pulling force on the 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 the long-term strength under the effect of the long-term constant single shaft pulling force of concrete, the performance of creeping and consideration time factor.
(2) axle draws load-carbonization coupling test
Originally it is little, in light weight to hold year device volume.The whole test device can be placed the carbonization case, carry out long-term experimental Study on Carbonization of Concrete of drawing under the load action, promptly axle draws-carbonization lotus root cooperation concrete durability research down.
(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 the fluid sealant sealing at two ends up and down, and adopt supporting hoop banding.Guaranteeing under the prerequisite of good seal, inject corrosive liquids (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 etchant solution simultaneously 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, comprises base, at interval column is set 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; Last ball pivot pull bar runs through ball pivot web joint, support plate, limiting plate successively, and last ball pivot pull bar is fixed on the limiting plate by nut; Following ball pivot pull bar runs through ball pivot web joint, base down successively, and following 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 composite corrosion test, 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 composite corrosion test, it is characterized in that test specimen is a dumb-bell shape.
CN 201010161085 2010-04-12 2010-04-12 Concrete constant stretch holding and composite corrosion testing device CN102213660B (en)

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102636394A (en) * 2012-05-08 2012-08-15 中国建筑材料科学研究总院 Compressive stress loading and deformation measurement device and measurement method for deformation of test piece under compressive stress
CN103018158A (en) * 2012-11-27 2013-04-03 贵州航天精工制造有限公司 Pressure control method and pressure control device for testing adhesion resistance and corrosivity of rubber test piece
CN103149100A (en) * 2013-02-18 2013-06-12 东南大学 Concrete axis stretching creep tester and test method thereof
CN103674708A (en) * 2013-12-27 2014-03-26 大连大学 Multi-factor coupling concrete durability study experiment loading device
CN103940735A (en) * 2014-04-29 2014-07-23 湖南大学 System for testing interface friction performance of anchor or pile and soil and test method
CN103940652A (en) * 2014-04-29 2014-07-23 湖南大学 Sample blank manufacturing device and method for anchor or pile and soil interface friction performance test
CN104155198A (en) * 2014-08-05 2014-11-19 河海大学 Device for detecting solution erosion resistance condition of concrete when tensioned
CN104155185A (en) * 2014-08-29 2014-11-19 中国建筑材料科学研究总院 Concrete performance testing device under combined action of constant tensile load and erosion medium
CN104181034A (en) * 2014-08-29 2014-12-03 中国建筑材料科学研究总院 Device for testing performance of concrete under axial tensile stress
CN104236964A (en) * 2013-06-08 2014-12-24 青岛理工大学 Mold for concrete axial tension test piece and rod piece pre-embedding method by using the mold
CN104330319A (en) * 2014-11-04 2015-02-04 水利部交通运输部国家能源局南京水利科学研究院 Testing device capable of coupling stress field and chemical field
CN104792626A (en) * 2015-04-21 2015-07-22 东南大学 Experimental device of FRP rib durability under stretching stress and environment coupling effect
CN105092365A (en) * 2015-08-24 2015-11-25 三峡大学 Concrete component tensioned loading frame
CN105890969A (en) * 2016-04-08 2016-08-24 湖南城市学院 Testing mechanism for concrete creep under corrosion action, application and creep testing method
CN105928788A (en) * 2016-04-25 2016-09-07 重庆大学 Spherical hinge constraining method capable of realizing hinge joint compression on 1000-t testing machine
CN105954105A (en) * 2016-06-29 2016-09-21 福建工程学院 Test unit used for simultaneously applying lasting axial compressive load on multiple concrete samples
CN106248566A (en) * 2016-08-31 2016-12-21 西安摩尔石油工程实验室股份有限公司 Frame-type constant load stress corrosion testing device
CN107101876A (en) * 2017-06-21 2017-08-29 河海大学 Concrete slab corrosion deterioration test devices and methods therefor under complexing action
CN107132127A (en) * 2017-06-27 2017-09-05 河海大学 A kind of New Rock conventional triaxial compression test device and test method
CN108333044A (en) * 2017-12-28 2018-07-27 河海大学 A kind of power suitable for CT scan, which is split, draws load test equipment
CN108896404A (en) * 2018-06-19 2018-11-27 中国铁路总公司 A kind of prefabricated components are glued the experimental rig and its test method of seam tensile strength

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CN101387634A (en) * 2008-10-17 2009-03-18 东南大学 Uniaxial tension loading unit for testing concrete carbonizing performance under tensile stress and testing method
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CN2593182Y (en) * 2002-12-27 2003-12-17 北京航空材料研究院 Portable tensile stress corrosion test apparatus
CN101271102A (en) * 2008-05-06 2008-09-24 青岛理工大学 Cement base material direct pulling stress corrosion instrument
CN101271103A (en) * 2008-05-16 2008-09-24 东南大学 Experimental device for concrete multifactor permanent stability under co-action of pulling stress and surroundings
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Publication number Priority date Publication date Assignee Title
CN102636394B (en) * 2012-05-08 2013-12-18 中国建筑材料科学研究总院 Compressive stress loading and deformation measurement device and measurement method for deformation of test piece under compressive stress
CN102636394A (en) * 2012-05-08 2012-08-15 中国建筑材料科学研究总院 Compressive stress loading and deformation measurement device and measurement method for deformation of test piece under compressive stress
CN103018158A (en) * 2012-11-27 2013-04-03 贵州航天精工制造有限公司 Pressure control method and pressure control device for testing adhesion resistance and corrosivity of rubber test piece
CN103018158B (en) * 2012-11-27 2015-05-20 贵州航天精工制造有限公司 Pressure control method and pressure control device for testing adhesion resistance and corrosivity of rubber test piece
CN103149100A (en) * 2013-02-18 2013-06-12 东南大学 Concrete axis stretching creep tester and test method thereof
CN104236964A (en) * 2013-06-08 2014-12-24 青岛理工大学 Mold for concrete axial tension test piece and rod piece pre-embedding method by using the mold
CN104236964B (en) * 2013-06-08 2016-08-17 青岛理工大学 Concrete axial is to tensile test specimen mould and the rod member built-in process that uses this mould
CN103674708A (en) * 2013-12-27 2014-03-26 大连大学 Multi-factor coupling concrete durability study experiment loading device
CN103940735B (en) * 2014-04-29 2016-03-30 湖南大学 The interface friction performance pilot system of a kind of anchor or oil and pile and test method
CN103940735A (en) * 2014-04-29 2014-07-23 湖南大学 System for testing interface friction performance of anchor or pile and soil and test method
CN103940652A (en) * 2014-04-29 2014-07-23 湖南大学 Sample blank manufacturing device and method for anchor or pile and soil interface friction performance test
CN104155198A (en) * 2014-08-05 2014-11-19 河海大学 Device for detecting solution erosion resistance condition of concrete when tensioned
CN104155185A (en) * 2014-08-29 2014-11-19 中国建筑材料科学研究总院 Concrete performance testing device under combined action of constant tensile load and erosion medium
CN104181034B (en) * 2014-08-29 2017-07-28 中国建筑材料科学研究总院 Testing concrete performance device under a kind of axial tension stress
CN104181034A (en) * 2014-08-29 2014-12-03 中国建筑材料科学研究总院 Device for testing performance of concrete under axial tensile stress
CN104330319A (en) * 2014-11-04 2015-02-04 水利部交通运输部国家能源局南京水利科学研究院 Testing device capable of coupling stress field and chemical field
CN104792626A (en) * 2015-04-21 2015-07-22 东南大学 Experimental device of FRP rib durability under stretching stress and environment coupling effect
CN104792626B (en) * 2015-04-21 2018-07-20 东南大学 Tensile stress and FRP tendons endurance quality experimental provision under environment coupled action
CN105092365A (en) * 2015-08-24 2015-11-25 三峡大学 Concrete component tensioned loading frame
CN105890969A (en) * 2016-04-08 2016-08-24 湖南城市学院 Testing mechanism for concrete creep under corrosion action, application and creep testing method
CN105890969B (en) * 2016-04-08 2018-07-17 湖南城市学院 Concrete creep mechanism for testing and application and test method of creeping under corrosiveness
CN105928788A (en) * 2016-04-25 2016-09-07 重庆大学 Spherical hinge constraining method capable of realizing hinge joint compression on 1000-t testing machine
CN105954105B (en) * 2016-06-29 2018-12-07 福建工程学院 Multiple concrete samples are applied with the experimental rig of lasting shaft pressuring load simultaneously
CN105954105A (en) * 2016-06-29 2016-09-21 福建工程学院 Test unit used for simultaneously applying lasting axial compressive load on multiple concrete samples
CN106248566A (en) * 2016-08-31 2016-12-21 西安摩尔石油工程实验室股份有限公司 Frame-type constant load stress corrosion testing device
CN107101876B (en) * 2017-06-21 2019-09-24 河海大学 Concrete slab corrosion deterioration test devices and methods therefor under complexing action
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CN107132127A (en) * 2017-06-27 2017-09-05 河海大学 A kind of New Rock conventional triaxial compression test device and test method
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CN108333044B (en) * 2017-12-28 2020-06-05 河海大学 Power split-pull loading test equipment suitable for CT scanning
CN108896404A (en) * 2018-06-19 2018-11-27 中国铁路总公司 A kind of prefabricated components are glued the experimental rig and its test method of seam tensile strength

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