CN214066726U - A jig for concrete tensile test - Google Patents
A jig for concrete tensile test Download PDFInfo
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- CN214066726U CN214066726U CN202023136190.XU CN202023136190U CN214066726U CN 214066726 U CN214066726 U CN 214066726U CN 202023136190 U CN202023136190 U CN 202023136190U CN 214066726 U CN214066726 U CN 214066726U
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- 239000004567 concrete Substances 0.000 title claims abstract description 60
- 238000009864 tensile test Methods 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 47
- 239000010959 steel Substances 0.000 claims abstract description 47
- 238000012360 testing method Methods 0.000 claims abstract description 29
- 239000000725 suspension Substances 0.000 claims description 14
- 238000005034 decoration Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
本实用新型公开了一种混凝土抗拉测试用夹具，包括第一夹具和第二夹具，所述第一夹具包括吊拉杆、第一活动夹板、第二活动夹板、钢轴、螺栓和螺母，第一活动夹板和第二活动夹板的上端均开设有供钢轴端部穿过的通孔，钢轴的两端设置于所述通孔内，钢轴上套设有球铰链，吊拉杆的下端与球铰链连接；螺栓设置若干个，螺栓贯穿第一活动夹板和第二活动夹板，螺栓的自由端螺纹连接有螺母；第一活动夹板的第二活动夹板上用于夹持混凝土试件的表面上开设有若干横向的凹槽。通过在活动夹板内侧设置槽口及螺丝，很大程度上解决了试件与夹具的滑移问题；可以移动、转动的吊拉杆可以调节荷载作用线与试件轴线尽可能对中，从而减少试验误差。
The utility model discloses a concrete tensile test fixture, which comprises a first fixture and a second fixture. The first fixture comprises a tie rod, a first movable clamping plate, a second movable clamping plate, a steel shaft, a bolt and a nut. The upper ends of the first movable splint and the second movable splint are provided with through holes for the ends of the steel shaft to pass through, the two ends of the steel shaft are arranged in the through holes, the steel shaft is sleeved with a ball hinge, and the lower end of the hanging rod It is connected with the ball hinge; several bolts are arranged, the bolts penetrate the first movable splint and the second movable splint, and the free end of the bolt is threadedly connected with a nut; the second movable splint of the first movable splint is used to clamp the surface of the concrete specimen A number of transverse grooves are opened on it. By arranging notches and screws on the inner side of the movable splint, the problem of slippage between the specimen and the fixture is largely solved; the movable and rotating tie rod can adjust the load action line and the axis of the specimen to be as centered as possible, thereby reducing the number of tests error.
Description
Technical Field
The utility model relates to an engineering detection technology field, concretely relates to anchor clamps are used in concrete tensile test.
Background
The tensile property of the concrete is one of the basic mechanical properties, which is an important component for researching the concrete strength theory and failure mechanism and directly influences the anti-cracking performance of the reinforced concrete structure. The usual test method is to first prepare a concrete sample in strip form and then test it by clamping the ends of the concrete sample using a clamp and applying force using a tensile machine or a quantitative weight. However, when this method is used for measurement, there are two difficulties: firstly, the sliding between the test piece and the clamp is reduced as much as possible; secondly, the load action line and the axis of the tensile test piece are coincident as much as possible.
The existing test fixture for the tensile property of concrete, such as the high-performance test fixture disclosed in the Chinese patent with the application number of 201620695581.X, comprises a connecting arm, a clamping block for clamping a concrete sample, a fixed clamping plate with an L-shaped cross section, a movable clamping plate and a top column, wherein the connecting arm is connected with the outer side wall of the short edge of the fixed clamping plate, the free end of the short edge of the fixed clamping plate is connected with one side of the movable clamping plate through a bolt b, and the movable clamping plate and the fixed clamping plate form a C-shaped opening.
According to the test fixture, the contact surface between the fixture and the test piece is smooth, and the sliding is easy to generate; meanwhile, the load action line is not easy to adjust, and the deviation exists between the load action line and the axis of the tensile test piece easily, so that the eccentric tension of the test piece is caused. Therefore, the defects of the existing clamp cause low efficiency and high implementation difficulty in the concrete tensile property test, and the test value fluctuation is large.
Disclosure of Invention
The utility model aims to solve the technical problem that to the problem that above-mentioned prior art exists, a concrete tensile test is with anchor clamps is provided, the utility model discloses can carry out stable centre gripping to the concrete sample to can prevent that the eccentricity of concrete sample from being drawn.
The utility model aims at realizing through the following technical scheme:
a clamp for a concrete tensile test comprises a first clamp and a second clamp, wherein the first clamp comprises a suspension pull rod, a first movable clamp plate, a second movable clamp plate, a steel shaft, a bolt and a nut, through holes for the end parts of the steel shaft to pass through are formed in the upper ends of the first movable clamp plate and the second movable clamp plate, two ends of the steel shaft are arranged in the through holes, a ball hinge is sleeved on the steel shaft, and the lower end of the suspension pull rod is connected with the ball hinge; the bolts penetrate through the first movable clamping plate and the second movable clamping plate, and nuts are connected to free ends of the bolts in a threaded mode; a plurality of transverse grooves are formed in the surface, used for clamping the concrete sample, of the second movable clamping plate of the first movable clamping plate.
Preferably, a plurality of screws are in threaded connection with the second movable clamp plate of the first movable clamp plate on the first clamp at the position for clamping the concrete test piece.
Preferably, the lower end of the suspension rod on the first clamp is provided with an external thread section, the ball hinge is provided with a threaded hole matched with the threaded section, and the suspension rod is in threaded connection with the ball hinge through the threaded section and the threaded hole.
Preferably, clearance fit is formed between the first movable clamping plate and the steel shaft on the first clamp and between the second movable clamping plate and the steel shaft.
Preferably, holes for the bolts to pass through on the first movable clamping plate and the second movable clamping plate on the first clamp are unthreaded holes, and the aperture of each unthreaded hole is larger than the outer diameter of each bolt.
Preferably, the number of the bolts on the first clamp is four, and the four bolts are distributed on the peripheries of the first movable clamping plate and the second movable clamping plate and used for clamping the area of the concrete test piece.
Preferably, the second clamp comprises a connecting steel plate, a first movable clamping plate, a second movable clamping plate, a bolt and a nut, the lower ends of the first movable clamping plate and the second movable clamping plate are both provided with through holes for the end parts of the connecting steel plate to pass through, the two ends of the connecting steel plate are arranged in the through holes, and the middle part of the connecting steel plate is provided with a through hole for the screw rod of the universal testing machine to pass through; the bolts penetrate through the first movable clamping plate and the second movable clamping plate, and nuts are connected to free ends of the bolts in a threaded mode; a plurality of transverse grooves are formed in the surface, used for clamping the concrete sample, of the second movable clamping plate of the first movable clamping plate.
Preferably, a plurality of screws are in threaded connection with the second movable clamp plate of the first movable clamp plate on the second clamp plate at the position for clamping the concrete test piece.
Preferably, clearance fit is formed between the first movable clamping plate and the connecting steel plate and between the second movable clamping plate and the connecting steel plate.
Preferably, the hole that supplies the bolt to pass on the first movable clamp plate on the second anchor clamps and the second movable clamp plate is the unthreaded hole, the aperture of unthreaded hole is greater than the external diameter of bolt, and the bolt sets up four, and four bolts distribute and be used for the regional periphery of centre gripping concrete test piece on first movable clamp plate and the second movable clamp plate.
The utility model discloses following beneficial effect has:
in the utility model, the second movable clamping plate of the first movable clamping plate is provided with a plurality of transverse grooves on the surface for clamping the concrete sample, and through the grooves, the friction force between the second movable clamping plate of the first movable clamping plate and the concrete sample can be improved, thereby ensuring the stable clamping of the concrete sample; the two ends of the steel shaft are arranged in through holes which are formed in the upper ends of the first movable clamping plate and the second movable clamping plate and are used for the end parts of the steel shaft to pass through, so that the first movable clamping plate and the second movable clamping plate can move relative to the steel shaft, the position of a concrete test piece can be adjusted when the concrete test piece is clamped, and a load action line is coincided with the axis of the tensile test piece; the steel shaft is sleeved with a ball hinge, the lower end of the suspension pull rod is connected with the ball hinge, the coincidence degree of a load action line and the axis of a tensile test piece can be further adjusted through the ball hinge, the concrete test piece is prevented from being eccentrically pulled, and the accuracy of a detection result is improved.
Furthermore, there are a plurality of screws at the position threaded connection of centre gripping concrete sample on the second movable clamp plate of first movable clamp plate, can be further tightly push up the concrete sample through the screw, prevent that the concrete sample from pulling the in-process slippage.
Drawings
Fig. 1 is a front view of a first clamp of the present invention;
figure 2 is a side view of a first clamp of the present invention;
fig. 3 is a top view of the first clamp of the present invention;
fig. 4 is a schematic structural view of the clamping surfaces of the first movable clamping plate and the second movable clamping plate of the present invention;
fig. 5 is a front view of a second clamp of the present invention;
fig. 6 is a top view of a second clamp of the present invention;
figure 7 is a side view of a second clamp of the present invention;
figure 8 is the utility model discloses the schematic diagram when anchor clamps centre gripping concrete sample.
In the figure, 1-suspension rod; 2-a first movable splint; 3-a nut; 4-a gasket; 5-bolt; 6-a second movable splint; 7-a steel shaft; 8-screw nails; 9-a groove; 10-a screw; 11-connecting steel plates; 12-a nut; 13-concrete test piece, 14-ball hinge.
Detailed Description
The invention is further described below with reference to the figures and examples.
Referring to fig. 1-4, the utility model discloses clamp for concrete tensile test, including first clamp and second clamp, first clamp includes drop link 1, first movable clamp plate 2, second movable clamp plate 6, steel axle 7, bolt 5 and nut 3, and the upper end of first movable clamp plate 2 and second movable clamp plate 6 all sets up the through-hole that supplies steel axle 7 tip to pass, and the both ends of steel axle 7 set up in the through-hole, and the cover is equipped with the ball hinge on the steel axle 7, and the lower extreme and the ball hinge of drop link 1 are connected; a plurality of bolts 5 are arranged, the bolts 5 penetrate through the first movable clamping plate 2 and the second movable clamping plate 6, and the free ends of the bolts 5 are in threaded connection with nuts 3; a plurality of transverse grooves 9 are arranged on the surface of the second movable clamping plate 6 of the first movable clamping plate 2, which is used for clamping the concrete sample.
As a preferred embodiment of the present invention, referring to fig. 1 to 4, a plurality of screws 8 are screwed on the second movable clamp 6 of the first movable clamp 2 on the first clamp at the position of the concrete sample to be clamped, and the screws 8 are tightened during the test to clamp the concrete sample.
As the preferred embodiment of the present invention, the lower end of the suspension rod 1 on the first clamp with reference to fig. 1 and 2 is provided with an external thread section, the ball hinge is provided with a threaded hole adapted to the threaded section, and the suspension rod 1 and the ball hinge are connected by the threaded section and the threaded hole.
As the utility model discloses preferred embodiment, be clearance fit between first movable clamp plate 2 on the first anchor clamps and steel axle 7 and between second movable clamp plate 6 and the steel axle 7.
As the preferred embodiment of the present invention, the hole for the bolt 5 to pass through on the first movable clamp plate 2 and the second movable clamp plate 6 on the first clamp is a unthreaded hole, and the aperture of the unthreaded hole is greater than the outer diameter of the bolt 5.
As a preferred embodiment of the present invention, referring to fig. 2 and 4, four bolts 5 are provided on the first clamp, and four bolts 5 are distributed on the first movable clamp 2 and the second movable clamp 6 to be used for clamping the periphery of the concrete sample area.
As a preferred embodiment of the present invention, referring to fig. 5-8, the second clamp includes a connection steel plate 11, a first movable clamp plate 2, a second movable clamp plate 6, a bolt 5 and a nut 3, the lower ends of the first movable clamp plate 2 and the second movable clamp plate 6 are both provided with a through hole for the end of the connection steel plate 11 to pass through, both ends of the connection steel plate 11 are disposed in the through hole, and the middle of the connection steel plate 11 is provided with a through hole for the screw 10 of the universal testing machine to pass through; a plurality of bolts 5 are arranged, the bolts 5 penetrate through the first movable clamping plate 2 and the second movable clamping plate 6, and the free ends of the bolts 5 are in threaded connection with nuts 3; a plurality of transverse grooves 9 are arranged on the surface of the second movable clamping plate 6 of the first movable clamping plate 2, which is used for clamping the concrete sample.
As a preferred embodiment of the present invention, referring to fig. 5 to 7, a plurality of screws 8 are screwed to the second movable clamp 6 of the first movable clamp 2 of the second clamp at the position for clamping the concrete sample.
As the preferred embodiment of the present invention, the first movable clamping plate 2 and the connecting steel plate 11 and the second movable clamping plate 6 and the connecting steel plate 11 are in clearance fit.
As a preferred embodiment of the present invention, referring to fig. 5 to 7, the holes for the bolts 5 to pass through on the first movable clamp plate 2 and the second movable clamp plate 6 on the second clamp are unthreaded holes, the aperture of the unthreaded hole is greater than the outer diameter of the bolt 5, the bolt 5 is set to four, and four bolts 5 are distributed on the first movable clamp plate 2 and the second movable clamp plate 6 and are used for clamping the periphery of the concrete sample area.
Nine screws are uniformly distributed on the first movable clamping plate 2 and the second movable clamping plate 6.
In the utility model, the two movable clamping plates (namely the first movable clamping plate 2 and the second movable clamping plate 6) are connected by the bolt, so that the distance between the first movable clamping plate 2 and the second movable clamping plate 6 is adjustable, the clamp can adapt to the concrete test piece with irregular size, and the adaptation degree of the clamp to the test piece is improved; in addition, the inboard fluting of activity splint, and every splint trompil has set up 9 screw holes, and the juxtaposition has the screw, when testing, turns round tight screw, and the effectual slippage that has avoided influencing the test result.
Further, the suspension pull rod can move on the steel shaft and can rotate.
The clamp for the concrete tensile test of the utility model is operated by inserting the end part of a concrete sample between the clamps at the two ends (namely the first clamp and the second clamp), then adjusting the distance between the first movable clamp plate and the second movable clamp plate according to the size of the concrete sample, screwing the nuts corresponding to the four bolts, tightening the sample,
see figure 8 for details.
Compared with the prior art, the utility model has the advantages of: the operation is simple, and the sliding problem of the test piece and the clamp is solved to a great extent by arranging the notch and the screw at the inner side of the movable clamping plate; the movable and rotatable suspension pull rod can adjust the load action line to be aligned with the axis of the test piece as much as possible, so that the test error is reduced.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The clamp for the concrete tensile test is characterized by comprising a first clamp and a second clamp, wherein the first clamp comprises a suspension pull rod (1), a first movable clamp plate (2), a second movable clamp plate (6), a steel shaft (7), a bolt (5) and a nut (3), through holes for the end parts of the steel shaft (7) to pass through are formed in the upper ends of the first movable clamp plate (2) and the second movable clamp plate (6), two ends of the steel shaft (7) are arranged in the through holes, a ball hinge is sleeved on the steel shaft (7), and the lower end of the suspension pull rod (1) is connected with the ball hinge; a plurality of bolts (5) are arranged, the bolts (5) penetrate through the first movable clamping plate (2) and the second movable clamping plate (6), and the free ends of the bolts (5) are in threaded connection with nuts (3); a plurality of transverse grooves (9) are arranged on the surface of the second movable clamping plate (6) of the first movable clamping plate (2) for clamping the concrete sample.
2. The clamp for the concrete tensile test according to claim 1, wherein a plurality of screws (8) are threadedly connected to the second movable clamping plate (6) of the first movable clamping plate (2) at the position for clamping the concrete specimen.
3. The clamp for the concrete tensile test according to claim 1, wherein an external thread section is arranged at the lower end of the suspension rod (1), a threaded hole matched with the thread section is formed in the ball hinge, and the suspension rod (1) is in threaded connection with the ball hinge through the thread section and the threaded hole.
4. The clamp for the concrete tensile test according to claim 1, wherein the first movable clamp plate (2) and the steel shaft (7) and the second movable clamp plate (6) and the steel shaft (7) are in clearance fit.
5. The clamp for the concrete tensile test according to claim 1, wherein holes for the bolts (5) to pass through on the first movable clamping plate (2) and the second movable clamping plate (6) are unthreaded holes, and the diameter of each unthreaded hole is larger than the outer diameter of each bolt (5).
6. The clamp for the concrete tensile test according to claim 1, wherein four bolts (5) are arranged, and the four bolts (5) are distributed on the first movable clamping plate (2) and the second movable clamping plate (6) and used for clamping the periphery of the concrete sample area.
7. The clamp for the concrete tensile test according to claim 1, wherein the second clamp comprises a connecting steel plate (11), a first movable clamping plate (2), a second movable clamping plate (6), a bolt (5) and a nut (3), through holes for the end portions of the connecting steel plate (11) to pass through are formed in the lower ends of the first movable clamping plate (2) and the second movable clamping plate (6), two ends of the connecting steel plate (11) are arranged in the through holes, and a through hole for the screw rod (10) of the universal testing machine to pass through is formed in the middle of the connecting steel plate (11).
8. The clamp for the concrete tensile test according to claim 7, wherein a plurality of screws (8) are threadedly connected to the second movable clamping plate (6) of the first movable clamping plate (2) at the position for clamping the concrete specimen.
9. The clamp for the concrete tensile test according to claim 7, wherein the first movable clamping plate (2) and the connecting steel plate (11) are in clearance fit, and the second movable clamping plate (6) and the connecting steel plate (11) are in clearance fit.
10. The clamp for the concrete tensile test according to claim 7, wherein holes for the bolts (5) to pass through on the first movable clamping plate (2) and the second movable clamping plate (6) are unthreaded holes, the diameter of each unthreaded hole is larger than the outer diameter of each bolt (5), the number of the bolts (5) is four, and the four bolts (5) are distributed on the first movable clamping plate (2) and the second movable clamping plate (6) and used for clamping the periphery of a concrete test piece area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023136190.XU CN214066726U (en) | 2020-12-23 | 2020-12-23 | A jig for concrete tensile test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023136190.XU CN214066726U (en) | 2020-12-23 | 2020-12-23 | A jig for concrete tensile test |
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| Publication Number | Publication Date |
|---|---|
| CN214066726U true CN214066726U (en) | 2021-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023136190.XU Active CN214066726U (en) | 2020-12-23 | 2020-12-23 | A jig for concrete tensile test |
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| CN (1) | CN214066726U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118032484A (en) * | 2024-02-23 | 2024-05-14 | 重庆交通大学 | Anchoring device and method suitable for axial tension performance testing of ultra-high performance concrete |
-
2020
- 2020-12-23 CN CN202023136190.XU patent/CN214066726U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118032484A (en) * | 2024-02-23 | 2024-05-14 | 重庆交通大学 | Anchoring device and method suitable for axial tension performance testing of ultra-high performance concrete |
| CN118032484B (en) * | 2024-02-23 | 2024-09-13 | 重庆交通大学 | Anchoring device and method suitable for ultra-high performance concrete axial-pull performance test |
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