CN204575436U - Rectangular pyramid shape Analysis of Concrete Tensile piece fixture - Google Patents
Rectangular pyramid shape Analysis of Concrete Tensile piece fixture Download PDFInfo
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- CN204575436U CN204575436U CN201520296108.XU CN201520296108U CN204575436U CN 204575436 U CN204575436 U CN 204575436U CN 201520296108 U CN201520296108 U CN 201520296108U CN 204575436 U CN204575436 U CN 204575436U
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Abstract
The utility model relates generally to a kind of rectangular pyramid shape Analysis of Concrete Tensile piece fixture, and comprise the end kelly that one end and tension tester are fixing, the end kelly other end is fixed by kelly hold-down nut and fixture end plate; Fixture end plate is provided with end plate stiffening rib; Fixture end plate is square, and every bar limit is all by can the hinge of free-open-close be flexibly connected with a loose-leaf buckle, and four measure-alike loose-leaf buckles are from two ends clamping fixing concrete test specimen on four sides; After blocking test specimen, fixed by buckle fixed jack and the reinforcing bar cutting of inserting in buckle fixed jack between adjacent loose-leaf buckle.The utility model structure is simple, easy to use, achieves the direct test to concrete sample axial tensile strength index, makes the test of this index directly and accurately.
Description
Technical field
The utility model belongs to the field tests of concrete axial tensile strength index, relates to a kind of Analysis of Concrete Tensile piece fixture, particularly relates to the fixture directly tested centering fastening and the enforcement test specimen tensile strength index of tensile test specimen end, concrete axle center.
Background technology
At present, the test of concrete axial tensile strength index mainly contains two kinds of methods, and one is the direct method of testing of test piece end embedded bar, and two is diametral compression test indirectly testing methods.Direct method of testing: the prism test specimen of building shaping 100mm × 100mm × 500mm with punching block, by being embedded in the reinforcing bar at test specimen axis two ends, applies pulling force to test specimen, and average tension when test specimen destroys is concrete axial tensile strength; Diametral compression test belongs to indirect test method, carry out with cube or right cylinder test specimen, test specimen adds between lower support surface and pressure plate of press machine a filler strip, make test specimen form corresponding bar shaped up and down to load, impel test specimen along the cleavage fracture of cube center or cylinder diameter tangent plane, payload values during splitting is carried out converting thus obtains concrete axial tensile strength.
The former, direct method of testing, at test specimen axis two ends embedded bar, end reinforcedly defines stress in test specimen inside and concentrates, and is easy to cause carrying out of crack, destroy the stress distribution of original concrete sample inside, impact records concrete tensile strength index accuracy.
The latter, adopts anti-diametral compression test indirect test method, first measures cleavage strength index, then carries out calculating according to the experience reduction formula of cleavage strength and tensile strength and obtains.The test figure that diametral compression test records has larger randomness, and reduction formula is also experimental formula, although diametral compression test is a kind of test method that acquisition concrete material tensile property generally adopts, its reliability and degree of accuracy need further improvement and improve.
Summary of the invention
Goal of the invention
The utility model is a kind of rectangular pyramid shape concrete sample fixture testing concrete sample tensile strength, by the rectangular pyramid shape end of fixture fastening Analysis of Concrete Tensile test specimen, drawn testing machine applies axial tension, its objective is the direct test realized concrete sample axial tensile strength index, make the test of this index directly and accurately.
Technical scheme
A kind of rectangular pyramid shape Analysis of Concrete Tensile piece fixture, can be stuck on the end dop of test specimen, it is characterized in that: comprise the end kelly that one end is fixed with tension tester, the end kelly other end is fixed by kelly hold-down nut and fixture end plate; Fixture end plate is provided with end plate stiffening rib; Fixture end plate is square, and every bar limit is all by can the hinge of free-open-close be flexibly connected with a loose-leaf buckle, and four measure-alike loose-leaf buckles are from two ends clamping fixing concrete test specimen on four sides; After blocking test specimen, fixed by buckle fixed jack and the reinforcing bar cutting of inserting in buckle fixed jack between adjacent loose-leaf buckle.
Fixture end plate is welded with a pair end plate stiffening rib.
Every bar limit of fixture end plate is all connected with a loose-leaf buckle by two hinges.
Loose-leaf buckle is isosceles trapezoid, its fixture end plate that is connected through the hinge of going to the bottom, and the length of going to the bottom is equal with the edge lengths of fixture end plate; The waist of each loose-leaf buckle both sides has two buckle fixed jacks respectively, is set down, upper end, loose-leaf buckle side is twin jack, lower end is single jack, opposite side upper end is single jack, and lower end is twin jack, and the jack of adjacent loose-leaf buckle near side is matched.
Fixture is steel article.
Hinge is steel hinge.
Advantage and effect
Advantage of the present utility model and good effect as follows:
The utility model directly can test out concrete tensile strength index, by jig and the accurate fastening mating test specimen, both ensure that in test specimen test process and kept axial tension, turn avoid the normal disadvantage occurred in current concrete tensile strength index test process---the directly problem of stress concentration of method of testing and the conversion problem of indirectly testing method, makes the test of concrete tensile strength index more convenient, accurate.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
Fig. 2 is that vertical view is launched in fixture one end.
Fig. 3 is tensile test specimen structural representation.
Description of reference numerals:
1. end kelly, 2. kelly hold-down nut, 3. fixture end plate, 4. end plate stiffening rib, 5. loose-leaf buckle, 6. hinge, 7. buckle fixed jack, 8. reinforcing bar cutting, 9. test specimen, 10. tension tester.
Embodiment:
Below in conjunction with the drawings and specific embodiments, the utility model is described further:
The utility model relates to a kind of rectangular pyramid shape Analysis of Concrete Tensile piece fixture, as shown in Figure 1-Figure 3, can be stuck on the end dop of test specimen 9, this fixture comprises one end and the fixing end kelly 1 of tension tester 10, and end kelly 1 other end is fixed by kelly hold-down nut 2 and fixture end plate 3; Fixture end plate 3 is provided with end plate stiffening rib 4, carries out to prevent affecting test because of end plate deformed in tension in tension test process; Fixture end plate 3 is square, every bar limit all by can the hinge 6 of free-open-close be flexibly connected with a loose-leaf buckle 5, four measure-alike loose-leaf buckles 5 in order to clamp two ends of fixing concrete test specimen from four sides, guarantee test specimen axial tension; Hinge 6 can free-open-close, test specimen for convenience detach; After blocking test specimen, fixed by buckle fixed jack 7 and the reinforcing bar cutting 8 of inserting in buckle fixed jack 7 between adjacent loose-leaf buckle 5, lock between two, form a firm cutting ferrule of positive rectangular pyramid shape, fixing test piece end rectangular pyramid.Jig uses in pairs, is completed the test of concrete tensile strength index together with the test specimen matched with it by cupping machine.Fixed jack 7 and reinforcing bar cutting 8 ensure test specimen axial tension in order to fixing loose-leaf buckle 5.
Fixture end plate 3 is welded with a pair end plate stiffening rib 4, gains in strength in case not-go-end plate deformed in tension.
Every bar limit of fixture end plate 3 is all connected with a loose-leaf buckle 5 (being namely connected with four measure-alike loose-leaf buckles 5 by eight hinges 6) by two hinges 6; When fixing test specimen 9, because the form loose-leaf binder board size of four sides is identical, and from four sides fixing concrete test piece end, ensure test specimen axial tension.
Before test specimen stretches, the buckle fixed jack 7 reinforcing bar cutting 8 being injected the loose-leaf buckle of each side forms a firm cutting ferrule of positive rectangular pyramid shape.Reinforcing bar cutting 8 can be extracted out after stretching by test specimen from the buckle fixed jack 7 of loose-leaf buckle, and hinge 6 can free-open-close, test specimen for convenience detach.
Loose-leaf buckle 5 is isosceles trapezoid, and it is gone to the bottom by hinge 6 jockey end plate 3, and the length of going to the bottom is equal with the edge lengths of fixture end plate 3; The waist of each loose-leaf buckle 5 both sides there are two buckle fixed jacks 7 respectively, be set down, upper end, loose-leaf buckle side is twin jack, lower end is single jack, opposite side upper end is single jack, lower end is twin jack, and the jack of adjacent loose-leaf buckle 5 near side is matched, and namely corresponding single jack inserts in the space between twin jack.
Above-mentioned fixture can adopt steel article, and hinge 6 can adopt steel hinge, to gain in strength.
Principle of work of the present utility model is as follows:
The size of rectangular pyramid shape Analysis of Concrete Tensile piece fixture and test specimen and tension tester adapts to.Testing machine is by the end kelly at the upper and lower two ends of bayonet coupling jig.End kelly is by being fixed on kelly hold-down nut on jig end plate and jig forms entirety.By jig end bar and nut screwing clamping during test, make upper and lower two jigs fix the two ends up and down of test specimen respectively by loose-leaf buckle, be placed into storing place of cupping machine test specimen.Testing machine can be started and carry out tension test, directly test out the tensile strength values of test specimen.Fixture and sample dimensions want consistent, and require more accurate.
Before and after rectangular pyramid shape concrete tension piece fixture described in the utility model work, operation steps is as follows:
(1) preliminary work before test will make Analysis of Concrete Tensile test specimen and carry out maintenance by relevant industries test specification.
(2) before the test each trapezoidal side of test specimen two ends dop part and end face are polished process.
(3) on-test, open tension tester starting switch, adjust testing machine bayonet socket position, make it to adapt with test specimen and jig size.
(4) open the loose-leaf buckle of jig four sides, put into by test specimen wherein, test specimen end face and fixture end plate are held out against, then closed loose-leaf buckle, is plugged reinforcing bar cutting.
(5) again the end kelly of jig and kelly hold-down nut are tightened, be placed into storing place of cupping machine test specimen, and by testing machine and jig end bar card jail.
(6) start testing machine and carry out tension test, directly test out the tensile strength numerical value of test specimen.
Embodiment 1:
Rectangular pyramid shape test specimen structure and size:
Rectangular pyramid shape Analysis of Concrete Tensile piece fixture and the custom-designed Analysis of Concrete Tensile test specimen of described structure match.Analysis of Concrete Tensile test specimen entirety is in dumb-bell shape (comprising the dop part at two ends and middle tension side), intermediate is the pure Tensile part that test specimen bears axial load like handle portion, this part is rectangular parallelepiped, the sectional dimension of rectangular parallelepiped is: 100mm × 100mm, length 100mm ~ 200mm; The two end portions that end dop is equivalent to " dumbbell " is square cone, and in the middle of square cone connects, tension section cross section (or being called bottom surface) is 100mm × 100mm, and end section is of a size of: 200mm × 200mm, and height is 100mm.Rectangular pyramid shape Analysis of Concrete Tensile piece fixture can along hinge position free-open-close.
Trapezoidal form loose-leaf binder board size:
Each fixture comprises four measure-alike loose-leaf buckles, is connected through the hinge between loose-leaf buckle and foursquare jig end face, and each loose-leaf buckle is locked in order to fixing test specimen by fixed jack and reinforcing bar cutting with adjacent loose-leaf buckle respectively.Loose-leaf buckle is trapezoidal upper bottom side length 200mm, and by hinge and jig end plate connection, go to the bottom length of side 100mm, and height is 112mm, and waist is about as 123mm, and thickness of slab is not less than 5mm.
Buckle fixed jack and reinforcing bar cutting:
Buckle fixed jack and reinforcing bar cutting are fixing and locking devices between two adjacent loose-leaf buckles, and both must match use.Each loose-leaf buckle both sides have two fixed jacks respectively, are set down.On the right side of buckle, upper end is twin jack, and lower end is single jack, and upper end, left side is single jack, and lower end is twin jack.The fixed jack of the side that adjacent loose-leaf buckle is close must match.There is fourth cap reinforcing bar cutting upper end, and fourth cap diameter is greater than cutting diameter, and cutting diameter is consistent with buckle fixed jack, guarantees to insert wherein.
Test specimen tensile strength value calculating method:
In process of the test, if when breaking test specimen, the load of cupping machine record is PkN, then the tensile strength values of test specimen can obtain with following formulae discovery:
σ＝1000P/10000(N/mm
2)＝0.1P(N/mm
2)＝100P(kPa) (1)。
With reference to the grading index that existing strength grade of concrete specification specifies, refer to table 1:
Table 1 concrete strength standard value (N/mm
2)
According to table 1, according to the concrete sample test for tensile strength value adopted measured by the utility model test fixture, and judge test specimen tensile strength standard value grade according to table 2.
Table 2 concrete tensile strength standard value grade criterion table
| Sequence number | The pulling force P value of experimental test | σ value (N/mm 2) | Concrete tensile strength grade | Remarks |
| 1 | P＜20.1kN | σ＜2.01 | Lower than C30 | Containing C15, C20, C25 |
| 2 | 20.1kN≤P＜22.0kN | 2.01≤σ＜2.20 | C30 | |
| 3 | 22.0kN≤P＜23.9kN | 2.20≤σ＜2.39 | C35 | |
| 4 | 23.9kN≤P＜25.1kN | 2.39≤σ＜2.51 | C40 | |
| 5 | 25.1kN≤P＜26.4kN | 2.51≤σ＜2.64 | C45 | |
| 6 | 26.4kN≤P＜27.4kN | 2.64≤σ＜2.74 | C50 |
| 7 | 27.4kN≤P＜28.5kN | 2.74≤σ＜2.85 | C55 | |
| 8 | 28.5kN≤P＜28.5kN | 2.85≤σ＜2.93 | C60 | |
| 9 | 29.3kN≤P＜29.9kN | 2.93≤σ＜2.99 | C65 | |
| 10 | 29.9kN≤P＜30.5kN | 2.99≤σ＜3.05 | C70 | |
| 11 | 30.5kN≤P＜31.1kN | 3.05≤σ＜3.11 | C75 | |
| 12 | 31.1kN≤P | 3.11≤σ | C80 | Specification highest ranking |
This rectangular pyramid of the utility model shape concrete tension piece fixture is that a kind of two ends are symmetrical, four sides is identical, end is positive rectangular pyramid shape, four sides buckle and between end face and adjacent side buckle by being hinged fixing test specimen, the axial tension of test specimen during warranty test, achieve the direct test to concrete sample axial tensile strength index, make the test of this index directly and accurately.Avoid and original adopt direct method of testing to concentrate the result caused inaccurate because of the inside concrete stress that embedded bar causes, also need not again through anti-diametral compression test carry out indirectly testing and rule of thumb reduction formula carry out conversion obtain, make the test of concrete tensile strength index more convenient, more direct.
Claims (6)
1. a rectangular pyramid shape Analysis of Concrete Tensile piece fixture, can be stuck on the end dop of test specimen, it is characterized in that: comprise the end kelly (1) that one end and tension tester (10) are fixing, end kelly (1) other end is fixed by kelly hold-down nut (2) and fixture end plate (3); Fixture end plate (3) is provided with end plate stiffening rib (4); Fixture end plate (3) is square, and every bar limit is all by can the hinge (6) of free-open-close be flexibly connected with a loose-leaf buckle (5), and four measure-alike loose-leaf buckles (5) are from two ends clamping fixing concrete test specimen on four sides; After blocking test specimen, fixed by buckle fixed jack (7) and the reinforcing bar cutting (8) of inserting in buckle fixed jack (7) between adjacent loose-leaf buckle (5).
2. rectangular pyramid shape Analysis of Concrete Tensile piece fixture according to claim 1, is characterized in that: on fixture end plate (3), be welded with a pair end plate stiffening rib (4).
3. rectangular pyramid shape Analysis of Concrete Tensile piece fixture according to claim 1, is characterized in that: every bar limit of fixture end plate (3) is all connected with a loose-leaf buckle (5) by two hinges (6).
4. the rectangular pyramid shape Analysis of Concrete Tensile piece fixture according to claim 1,2 or 3, it is characterized in that: loose-leaf buckle (5) is isosceles trapezoid, it is gone to the bottom by hinge (6) jockey end plate (3), and the length of going to the bottom is equal with the edge lengths of fixture end plate (3); The waist of each loose-leaf buckle (5) both sides has two buckle fixed jacks (7) respectively, and be set down, upper end, loose-leaf buckle side is twin jack, lower end is single jack, opposite side upper end is single jack, and lower end is twin jack, and the jack of adjacent loose-leaf buckle (5) near side is matched.
5. rectangular pyramid shape Analysis of Concrete Tensile piece fixture according to claim 1, is characterized in that: fixture is steel article.
6. rectangular pyramid shape Analysis of Concrete Tensile piece fixture according to claim 1, is characterized in that: hinge (6) is steel hinge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520296108.XU CN204575436U (en) | 2015-05-08 | 2015-05-08 | Rectangular pyramid shape Analysis of Concrete Tensile piece fixture |
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| CN201520296108.XU CN204575436U (en) | 2015-05-08 | 2015-05-08 | Rectangular pyramid shape Analysis of Concrete Tensile piece fixture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104792613A (en) * | 2015-05-08 | 2015-07-22 | 沈阳工业大学 | Rectangular pyramid concrete tensile specimen clamp |
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2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20150819 Termination date: 20180508 |