CN203037516U - Concrete uniaxial tension creep test auxiliary device - Google Patents

Concrete uniaxial tension creep test auxiliary device Download PDF

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Publication number
CN203037516U
CN203037516U CN 201220725544 CN201220725544U CN203037516U CN 203037516 U CN203037516 U CN 203037516U CN 201220725544 CN201220725544 CN 201220725544 CN 201220725544 U CN201220725544 U CN 201220725544U CN 203037516 U CN203037516 U CN 203037516U
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CN
China
Prior art keywords
concrete
test specimen
creeping
uniaxial
stretches
Prior art date
Application number
CN 201220725544
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Chinese (zh)
Inventor
魏亚
姚湘杰
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清华大学
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Priority to CN 201220725544 priority Critical patent/CN203037516U/en
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Publication of CN203037516U publication Critical patent/CN203037516U/en

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Abstract

The utility model discloses a concrete uniaxial tension creep test auxiliary device which comprises a cylindrical die, an anchor and a dial indicator or a linear variable differential transformer (LVDT) displacement sensor. The cylindrical die is used for pouring a concrete sample, the anchor respectively penetrates through the top and the bottom of the die, and the dial indicator or the LVDT displacement sensor is hung at the side portion of a sample to be tested. The device can be used repeatedly and can be freely matched with auxiliary accessories.

Description

The concrete in uniaxial testing auxiliary device of creeping that stretches
Technical field
The utility model belongs to technical field of measurement and test, is specifically related to a kind of concrete in uniaxial testing auxiliary device of creeping that stretches.
Background technology
Along with servo, mobility aid, load control mainboard development of technology, the servo Material Testing Machine of the gate-type cement-based material that is used for is more and more widely tested.When using the gate-type servo that concrete is carried out the tension load test, being connected and how guaranteeing that it is the key issue that is related to the test findings accuracy that test specimen is subjected to coaxial pulling force (namely as far as possible reducing eccentric tension) between test specimen and the folder, particularly for single shaft tension creep test, its cycle is long, and is high to the measuring accuracy requirement of displacement and load.Therefore, weighing the key that the single shaft tension whether tests successfully is: mechanical externally applied forces is distributed to uniformly on the cross section in the tested zone of test specimen.For reaching this purpose, use the test specimen of the bigger elongated shape of length-diameter ratio usually, many test specimens imitate especially the metal stretching test specimen cross-sectional area of measured zone is done little, as Fig. 1, shown in 2.The stretch test specimen of creeping of traditional concrete need be imbedded special grappling at two ends, or is stained with metal decking at the test specimen two ends.When loading to test specimen, mechanically be applied to load in the grappling or on the panel.Grappling and panel be criteria of right and wrong part all, needs specially, and installs loaded down with trivial detailsly, can not reuse.In addition, concrete belongs to hard brittle material, and its stretcher strain and strain are all very small, usually plug-in displacement transducer or stickup foil gauge on test specimen.The concrete in tension test specimen is with prismatic and cylindrical the most common.The mould of prismatic test specimen is simple relatively, just can produce distortion prismatic (as Fig. 1, shown in 2) by simple adjustment, concentrates but edges and corners form stress easily.Though cylinder specimen does not have corner angle, can not produce stress and concentrate, no matter all more difficult to suspension member is installed from the cast test specimen, also there is the problem of eccentric force.Therefore, necessary to develop a kind of cost of manufacture low, easy to assemble, and can give full play to mould and the coupling of right cylinder test specimen length.
The utility model content
The purpose of this utility model is to provide a kind of simple, economic proving installation, creeps for uniaxial tension and tests the concrete sample of building, and can guarantee test specimen centering preferably, at utmost reduces eccentric force and stress and concentrates.Simultaneously, the mould of described device can reuse, can be firm with the sensor carry on test specimen.
For achieving the above object, the utility model takes following technical scheme to be achieved.A kind of concrete in uniaxial testing auxiliary device of creeping that stretches, this device comprises: cylindrical mold, grappling, clock gauge or LVDT displacement transducer; Described cylindrical mold is used for the casting concrete test specimen, and described grappling connects described mould top and bottom, and described clock gauge or LVDT displacement transducer hang over the sidepiece of test specimen to be measured.Described cylindrical mold comprises cylindrical shell and disc top cover and the circular base plate of two splitting formula half barrel structures, and described top cover and chassis have perforate to be used to install grappling.Described cylindrical mold is by the ferrous materials manufacturing.Reserve circular hole on the sidewall of described cylindrical mold, be used for carrying additionally annex to building test specimen.Described grappling is bolt, screw rod or harness cord, and is coaxial with the central axis of described cylindrical mold.Described cylindrical mold is tandem stack up and down.The inwall of described cylindrical mold is installed organic glass-lined.Described clock gauge is fixed on the test specimen to be tested by fixing wooden handcuff.
Specifically, the mould after the closure provides a cylindrical space; There is perforate at the positive center on the top cover of cylinder and chassis.Two perforates are centering accurately, and grappling is implanted from perforate.Reserving diameter on the sidewall of tube is 3 millimeters circular holes, is used for carrying additionally annex to building test specimen.Can for example, build out the test specimen that interlude is slightly thin, two ends are slightly thick and be used for direct stretching experiment according to test needs loading and unloading annex with suitable adjustment test specimen shape, or seal up hole on the sidewall with the cylinder specimen of the standard of building out.Standard component (screw rod, harness cord all can) is adopted in grappling.Sealing is better after the mould closure.In the specimen molding process, mould is in and stands up, and the central axis of grappling and the central axis of described cylindrical mold are in coaxial, not influenced by deadweight off-centre takes place, and can guarantee the grappling centering of test specimen preferably.
Description of drawings
Fig. 1 is traditional prismatic test specimen figure.
Fig. 2 is the frame figure that creeps of the prior art.
Fig. 3 a is the mould synoptic diagram of the utility model device.
Fig. 3 b is the mould schematic perspective view, i.e. the stereographic map of Fig. 3 a.
Fig. 4 is the positive synoptic diagram of the combination of mould.
Fig. 5 is the three-dimensional combination figure of mould, i.e. the stereographic map of Fig. 4.
Fig. 6 is the organic glass liner.
Fig. 7 is the design sketch of test specimen.
Fig. 8 a is the combination installation diagram of test specimen section and LVDT sensor.
The synoptic diagram of Fig. 8 b sensor fixture block, real is the stereographic map of Fig. 8 a label 11.
Fig. 9 a is the combination installation diagram of test specimen section and clock gauge.
Fig. 9 b is the combined effect figure of test specimen and clock gauge.
Figure 10 is test specimen series connection synoptic diagram.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.For testing crew is adjusted the sample dimensions details according to actual conditions, be descriptive language so embodiment uses, but not restricted language.
Fig. 3 a is the mould synoptic diagram.Number in the figure is: 1, steel splitting formula mould open top; 2, main mould; 3, the small perforate on the mold wall (diameter is 3 millimeters circular hole); 4, chassis; 4-1, chassis screw; The screw on 4-2, main mould locking chassis; 5, main Die lock catch.
Fig. 3 b is the mould schematic perspective view, i.e. the stereographic map of Fig. 3 a.
Fig. 4 is the positive synoptic diagram of the combination of mould.
Fig. 5 is the three-dimensional combination figure of mould.Number in the figure is: 2, main mould; 4, chassis; 5, snap close; 6, organic glass liner; 7, screw grappling.
Fig. 6 is the organic glass liner.Number in the figure is: 61, the small perforate of glass-lined.
Fig. 7 is the design sketch of test specimen.
Fig. 8 a is the combination installation diagram of test specimen section and LVDT sensor, and number in the figure is: 9, screw; 10, steel joint angle-connection LVDT displacement transducer fixture block and test specimen; 11, sensor fixture block; 12, be positioned at the free-ended steel of test specimen angle; 8, LVDT displacement transducer.LVDT(Linear Variable Differential Transformer) is the abbreviation of linear variable difference transformer, belongs to linear displacement transducer.Principle of work briefly is the movable transformer of iron core.It is by a primary coil, two secondary coils, and iron core, coil rack, parts such as shell are formed.In the LVDT course of work, motion unshakable in one's determination can not exceed the range of linearity of coil, otherwise will produce non-linear value, so all LVDT all have a range of linearity.
Fig. 8 b is the stereographic map of the fixture block of Fig. 8 a label 11 indications.
Fig. 9 a is the combination installation diagram of test specimen section and clock gauge, and number in the figure is; 9, screw; 13, clock gauge fixture block; 14, be clock gauge; 12, the steel angle-, the steel angle is positioned at the free end of clock gauge probe.
Fig. 9 b is the combined effect figure of test specimen and clock gauge, and number in the figure is: 13, clock gauge fixture block; 14, be clock gauge; 15, metal wooden handcuff; 12, steel angle, the steel angle---be positioned at the free end of clock gauge probe.
Figure 10 is test specimen series connection synoptic diagram.Number in the figure is: 16, metal contiguous block.
Splitting formula mould is divided into two and half, and inwall can be loaded onto organic glass liner annex.Mould is vertically placed, put into grappling on the chassis among Fig. 4.Grappling screws on nut to prevent that it from sliding at long axis direction, sedimentation.Toward the interior casting concrete of mould, cover top cover then.With bolt with splitting formula mold-locked.The DRIVE SCREWS that punches from the mould side wall, screw gos deep into mould inside, except playing the effect that connects organic glass-lined, has also reserved perforate for carry sensor on the test specimen after the shaping.LVDT sensor folder; (Fig. 9 a 9b) just can be anchored in these perforates the fixture block of clock gauge.The LVDT fixture block shown in Fig. 8 b, is the bigger light material of rigidity (as organic glass) square, have one run through whole punch greatly and an expansion joint.The expansion joint can be by the stove bolt locking of one piece of diameter 3mm.Punching greatly on the fixture block is to insert the LVDT sensor; Its size should be consistent with the xsect of LVDT sensor stiff end, clamps sensor by the elastic properties of materials of fixture block itself and the effect of tightening up of bolt.Fixture block links to each other with steel angle (Fig. 8 a label 10) with test specimen, and the steel angle then is anchored on the test specimen by screw.The same with fixture block, also have the hole on the steel angle.The sound end of LVDT heads on the steel angle (Fig. 8 a label 12) that another bottom surface does not punch.The Validity Test scope of test specimen is the distance between the holdfast of steel angle.Fig. 8 a shows that test specimen is connected details with sensor.It is big that the volume of clock gauge, big from anharmonic ratio LVDT sensor, the rigidity that its anchor clamps need are also wanted.The main body of clock gauge anchor clamps (Fig. 9 a label 13) is thick about one a centimetre square organic glass (Fig. 8 label b); Be attached with the semicircle small pieces of a pair of organic glass on the main body, and leave opening for the probe of clock gauge.The clock gauge anchor clamps nip circular dial plate and the top of clock gauge.Also have a metal wooden handcuff (Fig. 9 a label 15) to be used for that a pair of semicircle small pieces locking on the main body of anchor clamps in addition.The width of metal wooden handcuff needs fully the diameter greater than the probe of clock gauge, because the metal wooden handcuff need stay opening for probe.Fig. 9 a, 9b show the section combination synoptic diagram of clock gauge and folder and test specimen respectively and face design sketch that this cover system also is to anchor on the sidewall of test specimen by screw.The probe of clock gauge also is to head on a steel angle, and is the same with the LVDT sensor.
In addition, test specimen can show as Figure 10 with the big metal dish series connection of rigidity, thereby once be that a plurality of test specimens load.

Claims (8)

1. the concrete in uniaxial testing auxiliary device of creeping that stretches is characterized in that this device comprises: cylindrical mold, grappling, clock gauge or LVDT displacement transducer; Described cylindrical mold is used for the casting concrete test specimen, and described grappling connects described mould top and bottom respectively, and described clock gauge or LVDT displacement transducer hang over the sidepiece of test specimen to be measured.
2. according to the described concrete in uniaxial of claim 1 testing auxiliary device of creeping that stretches, it is characterized in that, described cylindrical mold comprises cylindrical shell and disc top cover and the circular base plate of two splitting formula half barrel structures, and described top cover and chassis have perforate to be used to install grappling.
3. according to the described concrete in uniaxial of claim 1 testing auxiliary device of creeping that stretches, it is characterized in that described cylindrical mold is used the ferrous materials manufacturing.
4. according to the described concrete in uniaxial of claim 1 testing auxiliary device of creeping that stretches, it is characterized in that, reserve circular hole on the sidewall of described cylindrical mold, be used for carrying additionally annex to building test specimen.
5. according to the described concrete in uniaxial of claim 1 testing auxiliary device of creeping that stretches, it is characterized in that described grappling is bolt, screw rod or harness cord, and is coaxial with the central axis of described cylindrical mold.
6. according to the described concrete in uniaxial of claim 1 testing auxiliary device of creeping that stretches, it is characterized in that described cylindrical mold is tandem stack up and down.
7. according to the described concrete in uniaxial of claim 1 testing auxiliary device of creeping that stretches, it is characterized in that the inwall of described cylindrical mold is installed organic glass-lined.
8. according to the described concrete in uniaxial of claim 1 testing auxiliary device of creeping that stretches, it is characterized in that described clock gauge is fixed on the test specimen to be tested by fixing wooden handcuff.
CN 201220725544 2012-12-25 2012-12-25 Concrete uniaxial tension creep test auxiliary device CN203037516U (en)

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Application Number Priority Date Filing Date Title
CN 201220725544 CN203037516U (en) 2012-12-25 2012-12-25 Concrete uniaxial tension creep test auxiliary device

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Application Number Priority Date Filing Date Title
CN 201220725544 CN203037516U (en) 2012-12-25 2012-12-25 Concrete uniaxial tension creep test auxiliary device

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CN203037516U true CN203037516U (en) 2013-07-03

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103837413A (en) * 2014-03-07 2014-06-04 中南大学 Concrete tensile creep testing device and concrete shrinkage stress creep testing method
CN105784491A (en) * 2016-03-10 2016-07-20 清华大学 Cement-based material compression creep testing device
CN106680077A (en) * 2016-11-29 2017-05-17 湖北三江航天红阳机电有限公司 Hanging point testing device and method
CN111721627A (en) * 2020-06-11 2020-09-29 燕山大学 Device and testing method for ultra-early tensile creep of cement-based material
CN111982673A (en) * 2020-07-23 2020-11-24 河海大学 Height-adjustable soil body uniaxial tensile test method with sliding rod

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103837413A (en) * 2014-03-07 2014-06-04 中南大学 Concrete tensile creep testing device and concrete shrinkage stress creep testing method
CN105784491A (en) * 2016-03-10 2016-07-20 清华大学 Cement-based material compression creep testing device
CN106680077A (en) * 2016-11-29 2017-05-17 湖北三江航天红阳机电有限公司 Hanging point testing device and method
CN106680077B (en) * 2016-11-29 2020-04-21 湖北三江航天红阳机电有限公司 Hoisting point test device and method
CN111721627A (en) * 2020-06-11 2020-09-29 燕山大学 Device and testing method for ultra-early tensile creep of cement-based material
CN111721627B (en) * 2020-06-11 2021-04-02 燕山大学 Device and testing method for ultra-early tensile creep of cement-based material
CN111982673A (en) * 2020-07-23 2020-11-24 河海大学 Height-adjustable soil body uniaxial tensile test method with sliding rod

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