CN102507317A - Embedded concrete limit tension test device and concrete sample reinforcing method - Google Patents
Embedded concrete limit tension test device and concrete sample reinforcing method Download PDFInfo
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- CN102507317A CN102507317A CN201110321649XA CN201110321649A CN102507317A CN 102507317 A CN102507317 A CN 102507317A CN 201110321649X A CN201110321649X A CN 201110321649XA CN 201110321649 A CN201110321649 A CN 201110321649A CN 102507317 A CN102507317 A CN 102507317A
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Abstract
The invention relates to an embedded concrete limit tension test device and a concrete sample reinforcing method. The device comprises a universal joint (1) and an embedded threaded rod (2), wherein the universal joint (1) comprises a clamping shaft (4) and a sleeve (5); the bottom of the clamping shaft (4) stretches into the sleeve (5) and is in an inverse bowl shape; the shape of the top of the inner cavity of the sleeve (5) is matched with that of the bottom of the clamping shaft (4); the top of the embedded threaded rod (2) detachably stretches into the sleeve (5); and the lower part of the embedded threaded rod (2) is pre-embedded in concrete. The tension test device provided by the invention can ensure that a sample is subjected to axial tension; and by virtue of a reinforcing member, the end part of the concrete sample is effectively prevented from a breakage phenomenon. The tension test device provided by the invention has the advantages that the operation is simple and rapid, and the test precision is improved.
Description
Technical field
The present invention relates to be the test of a kind of concrete ultimate elongation the time test specimen carried out the flush type concrete ultimate elongation test unit of clamping and stretching and the reinforcement means of concrete reagent.
Background technology
In the last few years; Appearance along with shell structure buildingss such as high arch dams; Concrete stretch behavior is more and more paid attention to by people, at present can through such as the three-point bending beam method, split indirect methods such as daraf(reciprocal of farad), compact tension specimen method and obtain concrete stretching and fracture property, but undoubtedly; Concrete axle center tensile test is that the method with direct stretching concrete sample records ultimate tensile strength (UTS) and stretcher strain ability; Therefore also be measure concrete stretching overall process curve the most directly, the most objective, most complete method, measured stress, strain value corresponding relation are clear and definite, can accurately measure concrete structure behavior.Facts have proved, have the off-centre of load in the tensile test of concrete axle center inevitably, eccentricity issues is bigger to the direct tensile test influence; In addition; The influence of device, measuring technology, sample type etc. owing to be put to the test, test findings often has limitation, and discreteness is very big.
As design objective, the axle center tensile test requires the accurate centering of load to China's reinforced concrete structural design specification axial tensile-strength, and concrete stretching test specimen evenly distributes at the test lead upper stress, and test specimen fracture in the zone of appointment.Concrete sample is installed on the testing machine in the lower chuck; The main at present test specimen mode of transfer force that adopts mainly contains: external clamping, adhesive type and three kinds of fundamental types of flush type; Research shows, though the external clamping test specimen can access axle center tensile load preferably, concentrates owing to be easy to generate stress in clamping place; Fracture is prone to occur in the retaining part of test specimen, and is difficult to guarantee that the stress distribution of breaks is even; Adhesive type is respectively to paste a certain thickness steel plate in the end of concrete sample; Then along the central axis load application; This mode is easy to guarantee axial tension with respect to clipping, and the phenomenon of stress distribution inequality is much better, but this mode is had relatively high expectations to cementing agent; Especially for the super high strength concrete that has than the high tensile ultimate load, be prone in concrete and the fracture of steel plate junction; For the flush type test specimen; Use between testing machine and the test specimen and be partially embedded in the inner threaded rod of test specimen as Force transmission parts; Along the central axis load application, this mode also can guarantee axial tension then, and stress distribution is also comparatively even; But also there are some problems; Need guarantee the sliding phenomenon that bonds can not occur between embedded part and concrete sample like this flush type method, in concrete sample, certain length of embedment need be arranged based on this embedded part, concrete sample ruptures or the like at concrete end position at embedded part easily.
Based on above research; The direct tensile test device that different researchers adopts is not quite similar; Each have relative merits, therefore develop complete tensile test apparatus and method, solve the problem that there is big discrete type in present concrete stretching; Obtain complete drawing stress-strain full curve, have very important significance based on the axle center.
Summary of the invention
To the deficiency of above technical existence, the purpose of this invention is to provide a kind of flush type concrete ultimate elongation test unit and reinforcing member, utilize this device to transmit stress to test specimen, implement stable concrete stretching test operation.This device can overcome the defective that existing mode of transfer force exists, and reaches the test specimen axial tension, and test specimen is comparatively even in the stress distribution of test lead, improves measuring accuracy, easy and simple to handle, purpose efficiently.
The present invention is that said flush type concrete ultimate elongation test unit comprises universal joint and flush type threaded rod; Universal joint comprises clamp axis and sleeve; The bottom of clamp axis stretches in the sleeve, be the bowl-shape of back-off; The top shape of barrel bore matches with the bottom shape of clamp axis, and the top of flush type threaded rod is removably stretched in the sleeve, and its underpart is used for being embedded in concrete.
For the ease of being connected of universal joint and flush type threaded rod, above-mentioned universal joint also comprises coupling shaft, and in the top of this coupling shaft was removably stretched in the sleeve, the top of flush type threaded rod was removably stretched in the inner chamber of coupling shaft.
In order to strengthen the grasping force of flush type threaded rod to concrete sample; Make between flush type threaded rod and the concrete sample and do not have sliding phenomenon; The bottom of flush type threaded rod is provided with at least one deck along shaft radially equally distributed " L " type reinforcement, and the integral width that the flush type threaded rod behind " L " type reinforcement (8) is set is not more than 2/3 of concrete sample sectional dimension usually.
It is lubricated to fill butter between the clamp axis bottom of above-mentioned universal joint and the sleeve, and clamp axis can be turned to arbitrarily in allowed band.
Flush type concrete ultimate elongation test unit of the present invention can be measured the axle center tensile test of the concrete sample that is embedded with the flush type threaded rod; Through the loading of testing machine, power transmission is to the universal joint place, and universal joint is through freely changing direction; Guarantee that test specimen is in the axle center draw direction; Avoid eccentric force, arrive concrete sample through the direct power transmission of flush type threaded rod then, rupture at flush type threaded rod and concrete junction in order to prevent concrete sample; And then adopt reinforcing member that concrete easy fracture position is reinforced; Guarantee concrete regional fracture a little less than reinforcing place intermediate thin, can effectively avoid the phenomenon of concrete sample broken end, thereby obtain concrete stretching stress-strain curve.The present invention is simple to operate, quick, and has improved the precision of test.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structural representation of clamp axis in the universal joint.
Fig. 3 is the synoptic diagram of tubular sleeve and coupling shaft in the universal joint.
Fig. 4 is the structural representation of flush type threaded rod.
Fig. 5 is to use the drawing stress-strain full curve of the concrete left surface that test unit of the present invention tests out.
Fig. 6 is to use the drawing stress-strain full curve of the concrete right flank that test unit of the present invention tests out.
Embodiment
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
Extremely shown in Figure 4 like Fig. 1; The present invention includes universal joint 1 and flush type threaded rod 2, universal joint 1 comprises clamp axis 4, coupling shaft 6 and tubular sleeve 5, and clamp axis 4 is Φ 20mm * 160mm steel material; Its bottom stretches in the sleeve 5, be the bowl-shape of back-off; The top shape of sleeve 5 inner chambers matches with the bottom shape of clamp axis 4, fills butter between clamp axis 4 bottoms and the tubular sleeve 5 and lubricates, and clamp axis can be turned to arbitrarily in allowed band.
Coupling shaft is Φ 50mm * 50mm screw-thread steel, in the screw thread that runs through of Φ 20mm is arranged, with tubular sleeve 5 other ends through being threaded.
Flush type threaded rod 2 is the screw-thread steel material of Φ 25mm * 150mm; Its top is removably stretched in the inner chamber of coupling shaft 6 through the mode that is threaded; Flush type threaded rod 2 bottoms are welded with two-layer along the radially equally distributed Φ 5mm * 80mm of shaft " L " shaped steel matter reinforcement 8;, the other end is the screw thread of Φ 20mm * 35mm.The quantity of " L " type reinforcement 8 of every layer is identical, and the integral width that is provided with the flush type threaded rod 2 of " L " type reinforcement 8 is not more than 2/3 of concrete sample sectional dimension.
The employed reinforcing member of reinforcing mode according to the invention is made up of carbon cloth 10 and steel gusset plate 11, and carbon cloth 10 is wide to be 100mm, is about 800mm ~ 1000mm, and gusset plate 11 is 100mm * 100mm * 5mm
At first the moulding concrete sample is of a size of 100mm * 100mm * 515mm, and flush type threaded rod 2 is embedded in the concrete end when 9 moulding of concrete reagent; The pre-buried degree of depth is about 115mm, and 30 ~ 35mm screw thread is stayed in the outside, maintenance to regulation before the length of time 1d take out and to dry; Distinguish brushwork epoxy resin at concrete sample near about 60 ~ 70mm position, two ends; Twine two circles to two circles half with carbon cloth then, brushwork epoxy resin on the carbon cloth of concrete two sides carries out the stickup of steel plate then; So concrete steel plate position intermediate is about 150mm, this is the easy fracture of concrete zone.
To stipulating the length of time, at first on the threaded rod of concrete end, connect universal joint 2 behind the placement 1d; Concrete and universal joint 2 are positioned over grip of testing machine, universal joint are grasped through anchor clamps; Respectively place extensometer in two sides of concrete,
Range finding is carried out the axle center tension test at last for 150mm.
Fig. 5 is drawing stress-strain full curve of utilizing the concrete left surface of this test unit survey, and Fig. 6 is drawing stress-strain full curve of utilizing the concrete right flank of this test unit survey.As can be seen from the figure, the rule of test specimen both sides extensometer is identical, does not almost have eccentric phenomena, can guarantee that concrete is in the axial tension state.
Claims (7)
1. flush type concrete ultimate elongation test unit; It is characterized in that comprising universal joint (1) and flush type threaded rod (2); Universal joint (1) comprises clamp axis (3) and sleeve (4), and the bottom of clamp axis (3) is stretched in the sleeve (5), is the bowl-shape of back-off, and the top shape of sleeve (4) inner chamber matches with the bottom shape of clamp axis (3); The top of flush type threaded rod (2) is removably stretched in the sleeve (4), and its underpart is used for being embedded in concrete (7).
2. flush type concrete ultimate elongation test unit as claimed in claim 1; It is characterized in that universal joint (1) also comprises coupling shaft (5); The top of this coupling shaft (5) is removably stretched in the sleeve interior (4), and the top of flush type threaded rod (2) is removably stretched in the inner chamber of coupling shaft (5).
3. according to claim 1 or claim 2 flush type concrete ultimate elongation test unit is characterized in that flush type threaded rod (2) bottom is provided with at least one deck along shaft radially equally distributed " L " type reinforcement (6).
4. flush type concrete ultimate elongation test unit as claimed in claim 3, it is two-layer to it is characterized in that flush type threaded rod (2) bottom setting " L " type reinforcement (6) has, and the quantity of " L " type reinforcement (6) of every layer is identical.
5. like the said flush type concrete of claim 3 ultimate elongation test unit, the integral width of the flush type threaded rod (2) that is provided with " L " type reinforcement (6) that it is characterized in that is not more than 2/3 of concrete sample sectional dimension.
6. flush type concrete ultimate elongation test unit as claimed in claim 1, it is lubricated to it is characterized in that filling between clamp axis bottom and the tubular sleeve butter, and clamp axis can be turned to arbitrarily in allowed band.
7. the reinforcement means when adopting the said flush type concrete of claim 1 to 6 ultimate elongation test unit to carry out the test of concrete ultimate elongation; It is characterized in that first carbon cloth (8) is wrapped on the concrete sample; Winding position is positioned at the join domain of flush type threaded rod bottom and concrete sample, more at least two gusset plates (9) is bonded at the outside of carbon cloth on the concrete sample through epoxy resin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110321649XA CN102507317A (en) | 2011-10-21 | 2011-10-21 | Embedded concrete limit tension test device and concrete sample reinforcing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110321649XA CN102507317A (en) | 2011-10-21 | 2011-10-21 | Embedded concrete limit tension test device and concrete sample reinforcing method |
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| CN102507317A true CN102507317A (en) | 2012-06-20 |
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| CN201110321649XA Pending CN102507317A (en) | 2011-10-21 | 2011-10-21 | Embedded concrete limit tension test device and concrete sample reinforcing method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424480A (en) * | 2015-12-16 | 2016-03-23 | 北京建筑材料检验研究院有限公司 | Dovetail-shaped anchoring connecting part testing device and method |
| CN106289977A (en) * | 2016-08-15 | 2017-01-04 | 南宁学院 | A kind of peg Analysis of Concrete Tensile assay device and test method |
| 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 |
| CN107449661A (en) * | 2017-09-21 | 2017-12-08 | 北京工业大学 | A kind of rectangular slat sheet-type test specimen tensile test fixture |
| CN109520823A (en) * | 2019-01-04 | 2019-03-26 | 山东科技大学 | Embedded anchoring device and test method for rock tension test |
| CN107063997B (en) * | 2017-04-13 | 2023-09-05 | 辽宁工业大学 | A draw test device for muscle material |
| WO2024020663A1 (en) * | 2022-07-29 | 2024-02-01 | Ribeiro Luiz Claudio Elece | Test specimen, test piston, test base, test assembly and test specimen manufacturing method |
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| CN2066136U (en) * | 1989-08-01 | 1990-11-21 | 大连理工大学 | Rigidity supplementary device for fragile material direct tensile test |
| CN101650283A (en) * | 2009-09-11 | 2010-02-17 | 北京工业大学 | Mould for forming axial tensile-strength test piece of cement-based material and test method |
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2011
- 2011-10-21 CN CN201110321649XA patent/CN102507317A/en active Pending
Patent Citations (2)
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| CN2066136U (en) * | 1989-08-01 | 1990-11-21 | 大连理工大学 | Rigidity supplementary device for fragile material direct tensile test |
| CN101650283A (en) * | 2009-09-11 | 2010-02-17 | 北京工业大学 | Mould for forming axial tensile-strength test piece of cement-based material and test method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424480A (en) * | 2015-12-16 | 2016-03-23 | 北京建筑材料检验研究院有限公司 | Dovetail-shaped anchoring connecting part testing device and method |
| CN105424480B (en) * | 2015-12-16 | 2018-07-10 | 北京建筑材料检验研究院有限公司 | A kind of swallow-tail form anchor connector test device and test method |
| CN106289977A (en) * | 2016-08-15 | 2017-01-04 | 南宁学院 | A kind of peg Analysis of Concrete Tensile assay device and test method |
| CN106289977B (en) * | 2016-08-15 | 2023-02-28 | 南宁学院 | Bolt concrete tensile test device and test method |
| 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 |
| CN107063997B (en) * | 2017-04-13 | 2023-09-05 | 辽宁工业大学 | A draw test device for muscle material |
| CN107449661A (en) * | 2017-09-21 | 2017-12-08 | 北京工业大学 | A kind of rectangular slat sheet-type test specimen tensile test fixture |
| CN107449661B (en) * | 2017-09-21 | 2023-08-11 | 北京工业大学 | Rectangular strip thin plate type test piece tensile test clamp |
| CN109520823A (en) * | 2019-01-04 | 2019-03-26 | 山东科技大学 | Embedded anchoring device and test method for rock tension test |
| WO2019206071A1 (en) * | 2019-01-04 | 2019-10-31 | 山东科技大学 | Embedded-type anchor device for tensile testing of rock, and testing method |
| WO2024020663A1 (en) * | 2022-07-29 | 2024-02-01 | Ribeiro Luiz Claudio Elece | Test specimen, test piston, test base, test assembly and test specimen manufacturing method |
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Application publication date: 20120620 |