CN203479622U - Drawing test displacement measurement mechanism - Google Patents
Drawing test displacement measurement mechanism Download PDFInfo
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- CN203479622U CN203479622U CN201320597726.9U CN201320597726U CN203479622U CN 203479622 U CN203479622 U CN 203479622U CN 201320597726 U CN201320597726 U CN 201320597726U CN 203479622 U CN203479622 U CN 203479622U
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- reinforcing bar
- steel bar
- displacement
- drawing test
- measurement mechanism
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Abstract
The utility model relates to a drawing test displacement measurement mechanism which is used for performing a drawing test on a reinforced concrete member, belonging to the field of structure engineering. The drawing test displacement measurement mechanism comprises steel bars, wherein the steel bars comprise an upper section steel bar and a lower section steel bar; the upper section steel bar is connected with the lower section steel bar to form a whole through a threaded bushing; a connection sheet is arranged on the threaded bushing; a displacement meter is arranged on the connection sheet; the threaded bushing is sleeved with a second bushing. The drawing test displacement measurement mechanism can accurately measure the displacement of a loading end, so that the error of the displacement, which is caused by deformation of the steel bar without a bonded area during center drawing, is alleviated; the steel bar linear cutting length and the internal notching length are reduced.
Description
Technical field:
The utility model relates to a kind of pull-out test determining displacement mechanism, for reinforced concrete member pull-out test, belongs to Structural Engineering field.
Background technology:
At present, in reinforced concrete adhesive property, the application of measuring the bond-slip between reinforced concrete is very extensive, due to design, installation, construction, also has the effect of long load, can accurately not measure loading end reinforcing bar and concrete displacement.Its principal mode is to utilize free end to settle displacement meter and loading end to settle the relative displacement of displacement meter measuring point.It directly has influence on the accuracy of slippage between concrete and rebar, also has influence on the development in reinforcing bar and this direction research of concrete binding slippage.Its slippage main cause is that reinforcing bar self has surrender to extend in pull-out test, when the pull-out test of the center of employing, the displacement of loading end has comprised that in loading procedure, load is excessive, and between without bond regions reinforcement yielding constriction make reinforcing bar elongation and distant DATA REASONING inaccurate.Reinforced concrete center pull-out test is measured displacement at present following scheme:
[1] cross Zhenghai: < < reinforced concrete principle and analyze > >, publishing house of Tsing-Hua University in January, 2003.
[2] GB50152-92, Standard for test methods of concrete structures [s].
[3] Yang Haifeng: < < regeneration concrete pressurized constitutive relation and and reinforcing bar between bond-slip properties research > >, Guangxi University in May, 2012.
[4] Zheng Xiaoyan: the experimental study > > of < < bond-slip behavior of corroded steel bars in concrete under dynamic loads, civil engineering work journal, in June, 2006.
[5] Su little Cui: < < concrete structure basic principle > >, China Construction Industry Press, in May, 2012.
Summary of the invention
The purpose of this utility model is to provide a kind of pull-out test determining displacement simple in structure, accurate mechanism.
Technical solution:
The utility model comprises: reinforcing bar, and reinforcing bar is divided into epimere reinforcing bar and hypomere reinforcing bar, and epimere reinforcing bar and hypomere reinforcing bar are integrally connected by threaded sleeve, and threaded sleeve outer wall is provided with brace, and brace is provided with displacement meter, is set with the second sleeve pipe on threaded sleeve.
Between described threaded sleeve and the second cover outer tube layer, be provided with spatial joint clearance.
Beneficial effect
A, the utility model arrange sleeve pipe, have reduced the elongation of reinforcing bar, have measured accurately loading end displacement.
B, reduce in the drawing of Liao center the error of the displacement when without bond regions reinforcing bar deformation.
C, minimizing reinforcing bar line Cutting Length, internal recessing length.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation;
Embodiment
Reinforcing bar is divided into epimere reinforcing bar 6 and hypomere reinforcing bar 5, and two terminations of epimere reinforcing bar 6 and hypomere reinforcing bar 5 are machined into screw-like, and two ends are connected to form an integral body with screw shell 2.And at the close thin irony brace 3 of screw shell 2 welding from place, bond regions, irony brace 3 extends concrete test block, on irony brace 3, settles displacement meter.After installing, then at outer surface cover the second sleeve pipe 4 of screw shell 2, form without bonding pad.
Main working process is: two parts steel bar end is processed into screw-like, then with line cutting to anchored end reinforcing bar to cuing open, and with milling machine two halves reinforcing bar internal recessing, after interior subsides the first foil gauge 7, the second foil gauge 8, bonding two halves reinforcing bar.With screw shell 2, connect epimere reinforcing bar 6 and hypomere reinforcing bar 5, make fixedly to become integral body.Choose width moderate, length, compared with the irony brace 3 of thread bush pipe range 50mm, is folded into " L " shape, and long limit and threaded sleeve are weldingly connected, and minor face stretches out sleeve pipe, as displacement meter, measures base.The second sleeve pipe 4 internal diameters are greater than threaded sleeve and mutually do not contact, and it is fixed.Be fixed in template, casting concrete, vibrates, standing, standardized test sample of maintenance.Displacement meter is fixed on test specimen to displacement meter pointer contact iron sheet.Through pull-out test machine, load, reinforcing bar tension, concrete compression, produce relative slippage, screw shell 2 is close to loading ends and deformation does not occur, and measures the purpose of this utility model of loading end displacement accurately and is to provide the drawing of a kind of reinforced concrete simple in structure, accurate, effective center to measure loading end gearshift.
The utility model is used and is adopted 500 newton's universal hydraulic testing machines to carry out pull-out test to two groups of test specimens, and result is as follows:
Every group adopt 3 reinforcing bar length be identical, starting material are identical, with batch making, maintenance two groups of test specimens that equal each factor all equates mutually.First group adopts common displacement mode to load; Second group adopts the utility model to load.
The capable observation of contraposition shift-in after test, first group of test specimen measured data, and generally than second group of test specimen, to measure data large.Analyze its reason, break each test specimen and take out reinforcing bar, with cutting machine, cutting off without bond regions and bond regions, with ruler, measure loading end reinforcing bar length, test shows: reinforcement ratio the utility model that commonsense method is measured is long.And elongation equals common survey and has more part.
Experiment results proved this programme adopts center pull-out test can effectively measure loading end displacement in the test of concrete and rebar bond-slip.
Claims (2)
1. pull-out test determining displacement mechanism, comprise: reinforcing bar, it is characterized in that, reinforcing bar is divided into epimere reinforcing bar (6) and hypomere reinforcing bar (5), epimere reinforcing bar (6) and hypomere reinforcing bar (5) are integrally connected by threaded sleeve (2), threaded sleeve (2) outer wall is provided with brace (3), and brace (3) is provided with displacement meter, is set with the second sleeve pipe (4) on threaded sleeve (2).
2. pull-out test determining displacement mechanism according to claim 1, is characterized in that, between threaded sleeve (2) and the second sleeve pipe (4) skin, is provided with spatial joint clearance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597726.9U CN203479622U (en) | 2013-09-26 | 2013-09-26 | Drawing test displacement measurement mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597726.9U CN203479622U (en) | 2013-09-26 | 2013-09-26 | Drawing test displacement measurement mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203479622U true CN203479622U (en) | 2014-03-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320597726.9U Expired - Fee Related CN203479622U (en) | 2013-09-26 | 2013-09-26 | Drawing test displacement measurement mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203479622U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215214A (en) * | 2014-09-29 | 2014-12-17 | 东南大学 | Coal mine tunnel strain collecting device with adjustable length |
| CN105043881A (en) * | 2015-06-29 | 2015-11-11 | 内蒙古科技大学 | Measuring system for stress-strain relation of steel bar concrete center drawing test piece |
| CN107121278A (en) * | 2017-07-10 | 2017-09-01 | 内蒙金属材料研究所 | A kind of test device and method of testing for ensureing load test for fastener |
| CN107843554A (en) * | 2017-12-08 | 2018-03-27 | 信阳师范学院 | A kind of reinforced concrete interface bond stress test device and preparation method |
-
2013
- 2013-09-26 CN CN201320597726.9U patent/CN203479622U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215214A (en) * | 2014-09-29 | 2014-12-17 | 东南大学 | Coal mine tunnel strain collecting device with adjustable length |
| CN105043881A (en) * | 2015-06-29 | 2015-11-11 | 内蒙古科技大学 | Measuring system for stress-strain relation of steel bar concrete center drawing test piece |
| CN107121278A (en) * | 2017-07-10 | 2017-09-01 | 内蒙金属材料研究所 | A kind of test device and method of testing for ensureing load test for fastener |
| CN107843554A (en) * | 2017-12-08 | 2018-03-27 | 信阳师范学院 | A kind of reinforced concrete interface bond stress test device and preparation method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20160926 |