CN102680334A - Magnetic switch control drop hammer type bending impact resistance test table - Google Patents
Magnetic switch control drop hammer type bending impact resistance test table Download PDFInfo
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- CN102680334A CN102680334A CN2012101385712A CN201210138571A CN102680334A CN 102680334 A CN102680334 A CN 102680334A CN 2012101385712 A CN2012101385712 A CN 2012101385712A CN 201210138571 A CN201210138571 A CN 201210138571A CN 102680334 A CN102680334 A CN 102680334A
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Abstract
The invention relates to a magnetic switch control drop hammer type bending impact resistance test table and belongs to the technical field of concrete material test. The test table is characterized in that an impact frame is vertically welded with a base, a cantilever is connected with the impact frame through a movable screw bolt, the height is freely regulated, a magnetic switch is connected with the cantilever through a movable screw bolt, the position is freely regulated, the gap between two support seats can be freely regulated, a support seat screw rod and a fine steel plate form the fixation on a test piece, a force transfer device is placed in the middle position of the upper surface of the test piece, and a protecting device is fixedly arranged on the base through a base screw rod. The test table has the effects and benefits that the positioning of the impact hammer is realized through the magnetic switch, and the test precision is good; the fixing mode of the test piece at the support seat part perfectly adapts to the repeated impact test method; and the expanding performance and the adaptability of the test device are good, the manufacture and the installation are convenient, meanwhile, the operation is easy, and the test table can be used for test research in a laboratory and can also be used for the test evaluation of the bending impact resistance in engineering sites.
Description
Technical field
The invention belongs to technical field of civil engineering, relate to a kind of fiber concrete anti-bend impact test unit, belong to the concrete material technical field of measurement and test.
Background technology
Fiber concrete and compared with normal concrete, tensile strength, flexural tensile strength (claiming bending strength, rupture strength again), shearing strength all have raising, and toughness also has clear improvement.In recent years, the research to fiber concrete both at home and abroad deepens continuously, and the application of fiber concrete also more and more widely.The works effects of withstanding shocks such as bridge floor, road surface, prefabricated pile end more, and have considerable part to belong to bend crash, therefore, the anti-bend impact performance of research fiber concrete has crucial practical significance.
Mostly the test unit that Chinese scholars adopts to fiber concrete shock resistance research experiment is drop-weight test device or the device that drops hammer after improving on its basis that the ACI544 council is recommended, and being primarily aimed at compressive property is main impulse test.And in building and bridge structure, many beam type members must bear the impact load that causes bending stress, and the anti-bend impact performance is to estimate the important indicator of concrete material performance.But owing to still lack the resistance standard test device of test anti-bend impact performance at present, the designer still can't be with the anti-bend impact performance as a design parameter.The anti-bend impact test unit that relates in the domestic and foreign literature (Li Jianhui, Zhang Keqiang, Deng Zongcai. the regularity of distribution [J] of thick synthetic fiber concrete anti-bend impact intensity. architecture science and engineering journal, 2007,24 (4): 54-59; Y. Mohammadi; R. Carkon-Azad; S.P. Singh; S.K. Kaushik. Impact resistance of steel fibrous concrete containing fibres of mixed aspect ratio [J]. Construction and Building Materials, 2009, (23): 183-189; S. Mindess; A. Bentur.A preliminary study of the fracture of concrete beams under impact loading; Using high speed photography [J] .Cement and Concrete Research, 1985, (15): 474-484.); Not enough below existing: the hammer that liquidates is taked manual positioning, and shock height and ram hammer drop point are prone to produce error; Do not adopt suitable load transfer device, be prone to cause stress to concentrate, can't guarantee accuracy of experimental results; Device volume is huge, and complex structure can't be in the building site or on-the-spot the installation.
Summary of the invention
The technical matters that the present invention will solve provides a kind ofly can make that the anti-bend impact test findings is accurate, the scope of application extensively, be easy to carry; Can protect operator safety; Easy and simple to handle; The anti-bend impact testing table that is particularly useful for domestic different building ground; Be prone to produce error and lack the problem that factors such as suitable load transfer device is prone to cause that stress is concentrated exert an influence to the bending resistance Impulse Test Result thereby solved the ram hammer manual positioning, this device has been realized good expansion simultaneously, has wide range of applications.
Technical scheme of the present invention is:
Before carrying out impulse test, at first cantilever 2 is adjusted to desired height and is fixed on and impact on the frame 1 through movable bolt 14 according to testing requirements.According to testing requirements, the position of two bearings 11 makes the span requirement of its spacing Pass Test about adjustment, through bolt 12 bearing 11 is fixed on the base 13.Test specimen 10 is placed on the bearing 11, and erection support screw rod 7 and thin steel plate 9 be test specimen 10 fixedly.The center and the test specimen 10 upper surface centre of form centerings of magnetic switch 3 are confirmed with plumbing in the adjustment position of magnetic switch 3 on cantilever 2, and are fixed on the cantilever 2 through movable bolt 15." fiber concrete test method standard " CECS13:2009 that recommends according to Chinese engineering construction standard association, the ASTM C1018 of American Society for testing and materials standard etc. both at home and abroad relevant criterion for the test determination of the crooked performance of concrete; Can select the bending test of 3 loadings or the bending test of 4 loadings for use to different test objectives; Therefore in said anti-bend impact test unit; Load transfer device 6 has two kinds of forms: single roller bearing load transfer device and two roller bearing load transfer devices; Be respectively applied for the anti-bend impact test of 3 loadings and 4 loadings, can select for use a kind of during test according to testing requirements.Place load transfer device 6 in test specimen 10 upper surface centre positions, make the load transfer device 6 upper surface centres of form overlap with the whereabouts trace of ram hammer 4 with the line of the test specimen 10 upper surface centres of form.Protective device 5 is fixed on the base 13 through base screw rod 8, and the bolt on the adjustment base screw rod 8 can make protective device 5 move up and down, and up to contacting with load transfer device 6, uses the levelling pole measurement to guarantee that load transfer device 6 is horizontal positioned simultaneously.
When carrying out impulse test; Open magnetic switch 3 ram hammer 4 is adsorbed on the magnetic switch 3, close magnetic switch 3 then, ram hammer 4 free-falling under the effect of self gravitation; Impact is positioned at the load transfer device 6 of test specimen 10 upper surfaces; Drop on afterwards in the protective device 5, testing crew is observed test specimen and is destroyed situation, is regarded as the one-shot circulation.
Effect of the present invention and benefit are:
The location that the present invention realizes ram hammer through magnetic switch can guarantee that each shock height is consistent, guarantees that the each drop point of ram hammer is identical, guarantees that simultaneously ram hammer is that the initial velocity perseverance is zero freely falling body; The load transfer device that the present invention adopts meets the loading requirement of domestic and international standard for the test of concrete material bending property; Test specimen is fixed on the bearing through bearing screw rod and thin steel plate, prevents the changing of the relative positions takes place in impact process, has improved test accuracy and efficient, and this fixed form can well adapt to the test method of repeated stock; Protective device has effectively strengthened the security of impulse test, the protection test personal security; The adjustable height of cantilever, the spacing of two bearings is adjustable, can satisfy the impulse test requirement of different shock heights, different spans test specimen, and the expansion and the adaptability of device are good; The present invention is simple in structure, and fabrication and installation are convenient, are easy to carry, and need not any energy that orders about, environmental protection, and the experimental study that both can be used in the testing laboratory also can be used for the test evaluation that engineering site carries out the anti-bend impact performance.
Description of drawings
Accompanying drawing 1 is a magnetic switch control drop hammer type anti-bend impact test platform structure synoptic diagram.
Accompanying drawing 2 is magnetic switch control drop hammer type anti-bend impact testing table left side side views.
Accompanying drawing 3 is magnetic switch control drop hammer type anti-bend impact testing table base plane synoptic diagram.
Among the figure: 1 impacts frame; 2 cantilevers; 3 magnetic switchs; 4 ram hammers; 5 protective devices; 6 load transfer devices; 7 bearing screw rods; 8 base screw rods; 9 thin steel plates; 10 test specimens; 11 bearings; 12 bolts; 13 bases; 14 movable bolts; 15 movable bolts.
Embodiment
Be described in detail practical implementation step of the present invention below in conjunction with technical scheme and accompanying drawing.
Step 1. base 13 is placed on the rigid ground, through being fixed on the smooth rigid ground with expansion bolt after the levelling pole leveling;
Step 2. is adjusted to desired height with cantilever 2 and is fixed on the impact frame 1 through movable bolt 14;
The position of two bearings 11 made its spacing satisfy the requirement of test specimen span about step 3. was adjusted in the dovetail groove of base 13, and is fixing through bolt 12;
Step 4. is placed on test specimen 10 on the bearing 11, and erection support screw rod 7 and thin steel plate 9 be test specimen 10 fixedly;
Its center and test specimen 10 upper surface centre of form centerings are confirmed through plummet in the position of step 5. adjustment magnetic switch 3, and the whereabouts trace that guarantees ram hammer 4 is fixed on magnetic switch 3 on the cantilever 2 through movable bolt 15 through the test specimen 10 upper surface centres of form then;
Step 8. is opened magnetic switch 3 with ram hammer 4 absorption;
Step 9. is closed magnetic switch 3, and the load transfer device 6 that is positioned at test specimen 10 upper surfaces is impacted in ram hammer 4 free-fallings;
The every completion one-shot of step 10., testing crew should be observed the surface of test specimen 10, and the impact number of times when the visual crack of article one appears in record is that incipient crack is impacted number of times, continues to impact, and the impact number of times during record crack propagation to loading surface impacts number of times for destroying.
Claims (1)
1. a magnetic switch is controlled drop hammer type anti-bend impact testing table; Comprise: base (13), bearing (11), impact frame (1), cantilever (2), magnetic switch (3), ram hammer (4), load transfer device (6), protective device (5) is characterized in that:
A) base (13) is fixed on the rigid ground through expansion bolt, impacts frame (1) and the vertical welding of base (13);
B) cantilever (2) is connected with impact frame (1) through movable bolt (14), freely adjusts height along impacting frame (1), and magnetic switch (3) is connected with cantilever (2) through movable bolt (15), along cantilever (2) free adjustment position;
C) two bearings (11) are connected with base (13) through bolt (12) about, and the spacing of two bearings (11) is freely adjusted;
D) test specimen (10) is placed on the bearing (11), and is fixing through bearing screw rod (7) and thin steel plate (9);
E) load transfer device (6) is placed on test specimen (10) upper surface centre position; The surperficial centre of form of load transfer device (6) overlaps with the whereabouts trace of ram hammer (4) with test specimen (10) upper surface centre of form line, and load transfer device (6) passes to test specimen (10) with the percussive action of ram hammer (4);
F) protective device (5) is fixed on the base (13) through base screw rod (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012101385712A CN102680334A (en) | 2012-05-04 | 2012-05-04 | Magnetic switch control drop hammer type bending impact resistance test table |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101385712A CN102680334A (en) | 2012-05-04 | 2012-05-04 | Magnetic switch control drop hammer type bending impact resistance test table |
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| CN102680334A true CN102680334A (en) | 2012-09-19 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280300A (en) * | 2013-07-08 | 2015-01-14 | 波音公司 | Modal Impact Testing Assembly, System and Method |
| CN108507888A (en) * | 2018-04-25 | 2018-09-07 | 中国矿业大学(北京) | A kind of non-contact self-priming dynamic impact device |
| CN113324856A (en) * | 2021-07-13 | 2021-08-31 | 中南大学 | Device and method for testing impact toughness of concrete material |
| CN113804384A (en) * | 2021-08-10 | 2021-12-17 | 中国核电工程有限公司 | Rigid platform for heavy impact load test |
Citations (4)
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| CN2413279Y (en) * | 2000-03-23 | 2001-01-03 | 铁道部科学研究院铁道建筑研究所 | Drop hammer type roadbed stiffness tester |
| CN201034892Y (en) * | 2007-04-28 | 2008-03-12 | 武汉钢铁(集团)公司 | NDT falling weight impact test machine |
| CN101738348A (en) * | 2009-12-31 | 2010-06-16 | 大连理工大学 | Drop hammer type shock test bench controlled by magnetic switch |
| CN202522489U (en) * | 2012-05-04 | 2012-11-07 | 大连理工大学 | Falling weight type anti-bending impact test bed controlled by magnetic switch |
-
2012
- 2012-05-04 CN CN2012101385712A patent/CN102680334A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2413279Y (en) * | 2000-03-23 | 2001-01-03 | 铁道部科学研究院铁道建筑研究所 | Drop hammer type roadbed stiffness tester |
| CN201034892Y (en) * | 2007-04-28 | 2008-03-12 | 武汉钢铁(集团)公司 | NDT falling weight impact test machine |
| CN101738348A (en) * | 2009-12-31 | 2010-06-16 | 大连理工大学 | Drop hammer type shock test bench controlled by magnetic switch |
| CN202522489U (en) * | 2012-05-04 | 2012-11-07 | 大连理工大学 | Falling weight type anti-bending impact test bed controlled by magnetic switch |
Non-Patent Citations (3)
| Title |
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| ABDUL QADIR BHATTI，等: "An applicability of dynamic response analysis of shear-failure type RC beams with lightweight aggregate concrete under falling-weight impact loading", 《MATERIALS AND STRUCTURES》, 31 December 2011 (2011-12-31) * |
| 李建辉: "粗合成纤维混凝土力学特性及其细观增强机理", 《中国优秀硕士学位论文全文数据库（电子期刊）》, 16 December 2006 (2006-12-16), pages 28 - 30 * |
| 杨瑞姗: "玻璃纤维增强水泥性能试验方法 抗弯性能", 《中华人民共和国国家标准GB/T15231.3-94》, 1 June 1995 (1995-06-01) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280300A (en) * | 2013-07-08 | 2015-01-14 | 波音公司 | Modal Impact Testing Assembly, System and Method |
| CN104280300B (en) * | 2013-07-08 | 2018-10-30 | 波音公司 | Mode shock-testing components, systems and methods |
| CN108507888A (en) * | 2018-04-25 | 2018-09-07 | 中国矿业大学(北京) | A kind of non-contact self-priming dynamic impact device |
| CN113324856A (en) * | 2021-07-13 | 2021-08-31 | 中南大学 | Device and method for testing impact toughness of concrete material |
| CN113804384A (en) * | 2021-08-10 | 2021-12-17 | 中国核电工程有限公司 | Rigid platform for heavy impact load test |
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Application publication date: 20120919 |