CN202502014U - Fixture for concrete ultimate tensile test - Google Patents

Fixture for concrete ultimate tensile test Download PDF

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Publication number
CN202502014U
CN202502014U CN2012200182472U CN201220018247U CN202502014U CN 202502014 U CN202502014 U CN 202502014U CN 2012200182472 U CN2012200182472 U CN 2012200182472U CN 201220018247 U CN201220018247 U CN 201220018247U CN 202502014 U CN202502014 U CN 202502014U
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CN
China
Prior art keywords
test
concrete
clamping wheel
fixture
tensile
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Active
Application number
CN2012200182472U
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Chinese (zh)
Inventor
王宁
吴勇
阳运霞
陈东
李柯
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Jia Hua special cement incorporated company
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SICHUAN JIAHUA ENTERPRISE (GROUP) CO Ltd
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Priority to CN2012200182472U priority Critical patent/CN202502014U/en
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Abstract

The utility model discloses a fixture for concrete ultimate tensile test. The fixture mainly comprises box-shaped frame, a tensile clamping bolt and a pair of clamping wheel plates. A top plate and side plates are connected to form the box-shaped frame, the tensile clamping bolt is assembled on the top plate, and the clamping wheel plates are assembled on the side plates in a hinged manner. The clamping wheel plates in hinged connection can keep contacting and fitting with a stressed contact inclined plane of a test piece closely, so that the test piece is in a stressed state that a tensile bearing direction of the test piece during the ultimate tensile test is completely coincided with a geometrical axis. The fixture can be assembled on an existing tensile tester for performing the ultimate tensile test of concrete test pieces and measure test data accurately, has the remarkable advantages of simple structure, production easiness, low manufacturing cost, convenience in installation, use and operation, measurement data accuracy and low test expenses, and has excellent popularization and application prospects for detection operation in concrete test.

Description

Concrete ultimate elongation test fixture
Technical field:
The utility model relates to a kind of special auxiliary device that detects mechanical performance of concrete, specifically a kind of concrete ultimate elongation test fixture, and it is specially adapted on tension testing machine, concrete sample to be carried out the utmost point and draws test.
Background technology:
We know; " concrete for hydraulic structure testing regulations " (DL T5150-2001) is the standard method of existing concrete material check; It comprises performance test and on-site concrete quality testing and prompting appendix etc. such as concrete mix, concrete, full grating concrete, mortar, and 74 test methods are arranged altogether.Adopt this standard when the enterprising limit by row tension test of tension testing machine; Can be by the requirement production standard test specimen of (c) test specimen of Fig. 4 .4.2-1 in " concrete for hydraulic structure testing regulations " (DL T5150-2001) standard; Its basic structure shape is: two ends are symmetrical trapezoidal shape, the middle part is the elongated cylinder in the positive square of 100 * 100mm cross section; When making test specimen, also need be at two ends the pre-buried draw ring in end face center or bonding arm-tie just can be installed on as the stressed location point that stretches and carry out the operation that the utmost point draws test on the tension testing machine.We find in experiment work for many years: when making test specimen in a manner described, in the actual mechanical process of moulding and installation, have many drawbacks, it mainly shows as: make the time-consuming troublesome poeration of test specimen 1.; 2. bonding arm-tie and pre-buried draw ring are difficult to reclaim to be reused, and the waste of material loss is big; 3. test fitting operation holding time is long, test efficiency is low, expense is high; 4. measured result receives the influence of extraneous many factors bigger, causes the accuracy of test figure to reduce.For example: when adopting bonding arm-tie mode; The bonding location of arm-tie and bonding tight ness rating just draw the measured result of test that considerable influence is arranged to the utmost point; When particularly adopting pre-buried draw ring mode; The pre-buried position of two ends draw ring, the pre-buried degree of depth and firmness more can directly influence the experimental data accuracy that the utmost point draws test; Its main cause is: in the links such as moulding, installation and test practical operation of bonding arm-tie or pre-buried draw ring, just be difficult to make the actual direction of bearing stretching action power of test specimen to overlap fully with how much axial lines of test specimen.This existing just concrete utmost point draws in the experiment work to be needed further to improve and perfect technical matters, and this also is that the utility model is wanted the problem that solves.
The utility model content:
The purpose of the utility model is intended to overcome the above-mentioned weak point of prior art existence and proposes a kind of concrete ultimate elongation test fixture.It can greatly be simplified the preparation process of test specimen and then farthest reduce to influence the extraneous factor of experimental measurements, and this is to improving test efficiency, reducing testing expenses and guarantee that measuring accuracy all has positive effect.
The purpose of the utility model realizes through following technical scheme:
A kind of concrete ultimate elongation test fixture that the utility model proposes; It comprises box frame, folder bolt and clamping wheel plate stretch; Box frame is made up of side plate and top board; It is characterized in that: said clamping wheel plate is fitted to the side plate of box frame by hinge axis, and the folder bolt that stretches is fitted to the top board middle position of box frame.Its design feature is: the clamping wheel plate that is fitted to side plate can rotate around hinge axis freely.It is to carry out work as follows: take above-mentioned a pair of anchor clamps and will stretch and press from both sides two stretching axle heads that bolt is fixedly connected on tension testing machine respectively; Make test specimen by (c) pattern of Fig. 4 .4.2-1 in " concrete for hydraulic structure testing regulations " (DL T5150-2001) standard again; Only need two ends with test specimen be fitted in the above-mentioned anchor clamps the stressed contact inclined-plane that stably grasps the trapezoidal position of symmetry, test specimen two ends by the clamping wheel plate, can start tension testing machine and carry out the utmost point and draw test.When two stretching axle heads of tension testing machine through being fitted to box frame stretching folder bolt and when test specimen being applied stretching action power gradually by a pair of clamping wheel plate; The clamping wheel plate can be regulated adaptively around the hinge axis fine rotation automatically, can make the clamping surface of contact of clamping wheel plate form the fully closely binding face of contact with the stressed inclined-plane that contacts of test piece end.At this moment, two clamping wheel plates will be decomposed into vertical outside pulling force and the horizontal component of cancelling out each other through stressed contact inclined-plane to the acting force of test specimen.That is to say that test specimen in fact only receives a vertical outside stretching action power.Particularly the clamping wheel plate can rotate around hinge axis on structural design slightly; Make it to keep the tight contact condition of binding face and then regulate adaptively automatically receiving force direction with the stressed inclined-plane that contacts of test specimen; Therefore, it can to draw direction that guarantee test specimen in the process of the test actual bear stretching action power at the whole utmost point be to be in the stress that overlaps fully all the time with how much axial lines of test specimen.This is to improving measuring accuracy and guaranteeing that the true and accurate effective performance of test figure has positive effect.
The utility model also has following technical characterictic:
Clamping surface of contact subsides at the clamping wheel plate are lined with elastic sheet.This structural design is concentrated, is improved stressed even performance certain effect is arranged preventing stress.
Said elastic sheet is a leather substance, and the thickness of control elastic sheet is 1mm ~ 3mm, when real work, has easy to operate, the stressed uniform and stable advantage of surface of contact of the lining of subsides.
The spherical form that the spherical recess with the top board bottom surface adapts is arranged in the stretch bottom of folder bolt, and this structural design has good automatic aligning effect, and further raising measuring accuracy is also had certain effect.
The utility model is compared with prior art has following substantive distinguishing features and progress:
The utility model has been initiated on the box frame side plate test specimen clamp structure by the equipped clamping wheel plate of hinge axis; The method for making and test mounting means of at the test specimen two ends pre-buried draw ring or bonding arm-tie have thoroughly been abandoned; It can draw to regulate automatically in the test and receive force direction and make it to keep coincidence status with the test specimen axial line at the utmost point, can improve the measuring accuracy that the utmost point draws strength test effectively.The utlity model has simple and direct, easy to manufacture, the easy to install and test figure advantage of high accuracy of structure.
Description of drawings:
Fig. 1 is the structural representation (semisectional view) of the utility model, and accompanying drawing also makes an abstract.
Fig. 2 is A-A view of Fig. 1, shows that the clamping wheel plate is fitted to the structural representation of side plate by hinge axis.
Description of symbols in the accompanying drawing:
1 is the folder bolt that stretches, and 2 is top board, and 3 is hinge axis, and 4 is elastic sheet, and 5 are the clamping wheel plate, and 6 is stressed contact inclined-plane, and 7 is test specimen, and 8 is side plate.
Embodiment:
Further describe the embodiment of the utility model below in conjunction with accompanying drawing:
The concrete ultimate elongation test fixture that the utility model proposed; It mainly by a top board 2, two box frames that side plate 8 connects into, be fitted to the stretching folder bolt 1 of top board 2 middle positions and constitute by a pair of clamping wheel plate 5 that hinge axis 3 symmetries are fitted to biside plate 8 bottoms; On the clamping surface of contact of clamping wheel plate 5, paste lining one deck elastic sheet 4; The thickness of control elastic sheet 4 is 2 mm; The leather-like materials that said elastic sheet 4 optional usefulness have certain flexility is processed, and this is to the stressed uniform and stable performance of improving surface of contact and prevent that stress from concentrating good result of use is arranged.Middle position is provided with a spherical recess in the bottom surface of top board 2, and the spherical form that the spherical recess with top board 2 bottom surfaces adapts is made in the bottom of the folder bolt 1 that stretches, and can make the folder bolt 1 that stretches when tension test, have good automatic aligning effect.It carries out the ultimate tensile strength testing according to following mode clamping concrete sample on tension testing machine: the concrete ultimate elongation test fixture that the utility model proposes is two a pair of complete uses; Stretching folder bolt with a pair of anchor clamps is fixedly connected on respectively on two tensile axis axle heads of tension testing machine earlier; Make concrete sample by (c) pattern of Fig. 4 .4.2-1 in " concrete for hydraulic structure testing regulations " (DL T5150-2001) standard again; Need carry out the utmost point draws when testing; The two ends of test specimen 7 are fitted in the above-mentioned anchor clamps, can grasp the stressed contact inclined-plane 6 at the trapezoidal position of symmetry, test specimen 7 two ends by a pair of clamping wheel plate 5.Start tension testing machine then; Two tensile axis of tension testing machine will press from both sides bolt 1 and apply stretching action power gradually by 5 pairs of test specimens 7 of a pair of clamping wheel plate through the stretching that is fitted to box frame; At this moment clamping wheel plate 5 can be regulated automatically and do slight rotation around hinge axis 3 adaptively, can make the clamping surface of contact of clamping wheel plate 5 form the fully closely binding face of contact with the stressed inclined-plane 6 that contacts of test specimen 7 ends.Can know through force analysis: two clamping wheel plates 5 will be decomposed into the pulling force of vertical direction and the horizontal component of cancelling out each other through the acting force of the 6 pairs of test specimens 7 in stressed contact inclined-plane.On the whole: draw in the test overall process at the utmost point; Clamping wheel plate 5 can both contact inclined-plane 6 with test specimen 7 stressed and keep the fit-state of closely contact and regulate automatically and receive force direction; Make 7 of test specimens receive the stretching action power of a vertical direction, and can guarantee that the direction of stretching action power is in the stress that overlaps fully with how much axial lines of test specimen 7.So far, can realize goal of the invention that the ultimate tensile strength of test specimen 7 is accurately tested, accurately measured, and can greatly improve experiment work efficient, reduce and detect cost.
Obviously; The foregoing description only is one of the embodiment that can realize the utility model technical scheme; The utility model scope required for protection does not receive the restriction of present embodiment, also comprises other embodiment that can be made a variation according to the present technique scheme by those of ordinary skill in the art.

Claims (4)

1. concrete ultimate elongation test fixture; It comprises box frame, folder bolt (1) and clamping wheel plate (5) stretch; Box frame is made up of side plate (8) and top board (2); It is characterized in that: said clamping wheel plate (5) is fitted to the side plate (8) of box frame by hinge axis (3), and the folder bolt (1) that stretches is fitted to top board (2) middle position of box frame.
2. concrete ultimate elongation test fixture according to claim 1 is characterized in that: the clamping surface of contact subsides at clamping wheel plate (5) are lined with elastic sheet (4).
3. concrete ultimate elongation test fixture according to claim 1 and 2 is characterized in that: said elastic sheet (4) is a leather substance, and the thickness of control elastic sheet (4) is 1mm ~ 3mm.
4. concrete ultimate elongation test fixture according to claim 1 and 2 is characterized in that: the spherical form that the spherical recess with top board (2) bottom surface adapts is arranged in the bottom of the folder bolt (1) that stretches.
CN2012200182472U 2012-01-16 2012-01-16 Fixture for concrete ultimate tensile test Active CN202502014U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012200182472U CN202502014U (en) 2012-01-16 2012-01-16 Fixture for concrete ultimate tensile test

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Application Number Priority Date Filing Date Title
CN2012200182472U CN202502014U (en) 2012-01-16 2012-01-16 Fixture for concrete ultimate tensile test

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CN202502014U true CN202502014U (en) 2012-10-24

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103512799A (en) * 2013-10-22 2014-01-15 葛洲坝集团试验检测有限公司 Flexible holding device for concrete tensile test
CN104792613A (en) * 2015-05-08 2015-07-22 沈阳工业大学 Rectangular pyramid concrete tensile specimen clamp
CN107063840A (en) * 2016-11-30 2017-08-18 内蒙动力机械研究所 A kind of device for solid rocket motor case list skirt axis pulling experiment
CN107817154A (en) * 2017-10-26 2018-03-20 哈尔滨工业大学 Multifunctional concrete list draws specimen molding and experimental provision

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103512799A (en) * 2013-10-22 2014-01-15 葛洲坝集团试验检测有限公司 Flexible holding device for concrete tensile test
CN103512799B (en) * 2013-10-22 2016-04-06 葛洲坝集团试验检测有限公司 A kind of Analysis of Concrete Tensile test flexible holding device
CN104792613A (en) * 2015-05-08 2015-07-22 沈阳工业大学 Rectangular pyramid concrete tensile specimen clamp
CN104792613B (en) * 2015-05-08 2017-07-14 沈阳工业大学 Pyramid shape Analysis of Concrete Tensile piece fixture
CN107063840A (en) * 2016-11-30 2017-08-18 内蒙动力机械研究所 A kind of device for solid rocket motor case list skirt axis pulling experiment
CN107817154A (en) * 2017-10-26 2018-03-20 哈尔滨工业大学 Multifunctional concrete list draws specimen molding and experimental provision

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
C56 Change in the name or address of the patentee

Owner name: JIAHUA SPECIAL CEMENT CO., LTD.

Free format text: FORMER NAME: SICHUAN JIAHUA ENTERPRISE (GROUP) CORP., LTD.

CP03 Change of name, title or address

Address after: 614003 Ma'anshan City, Sichuan Province, No. nine Feng Road, No. 2,

Patentee after: Jia Hua special cement incorporated company

Address before: 614003, No. nine, Feng Feng Road, Shizhong District, Sichuan, Ma'anshan, Leshan, 2

Patentee before: Sichuan Jiahua Enterprise (Group) Co., Ltd.