CN217006923U

CN217006923U - Clamp for bonding strength test

Info

Publication number: CN217006923U
Application number: CN202220343385.1U
Authority: CN
Inventors: 孙丹; 王芊粤; 吴富民; 路兆峰; 梁明明; 张鹏; 王积运
Original assignee: Guangxin Testing And Certification Group Co ltd
Current assignee: Guangxin Testing And Certification Group Co ltd
Priority date: 2022-02-21
Filing date: 2022-02-21
Publication date: 2022-07-19
Anticipated expiration: 2032-02-21

Abstract

The utility model discloses a clamp for a bonding strength test, which comprises: the device comprises two clamping plates, a detection device and a control device, wherein the two clamping plates are used for clamping a sample to be detected from two ends; an avoidance hole is formed in the middle of the clamping plate and is used for being penetrated by the steel bar on the sample; the clamping plates are arranged on the two sides of the clamping plate, and the clamping plates are matched with the bolts; a plurality of the bolts are evenly distributed around the avoiding hole. The utility model can prevent the concrete block from being broken in the test process.

Description

Clamp for bonding strength test

Technical Field

The utility model relates to the technical field of engineering tests, in particular to a clamp for a bonding strength test.

Background

The relative adhesion strength test of epoxy resin coating reinforcing steel bars and concrete is one of common tests in engineering tests. In the prior art, when the bonding strength is tested, the drawing test is carried out on the steel bars partially inserted into the concrete columns or the wall surfaces. Because each test needs to be carried out on a construction site, the test is complicated, and in the prior art, a sample is firstly manufactured and tested.

The sample in the prior art is a cuboid concrete block through which the steel bars pass. During testing, the rebar was pulled out of the concrete block by a puller to measure the force required during the test.

When the concrete block is tested, the contact area between the concrete block and the drawing instrument is limited, so that the concrete block is easy to break due to overlarge local stress. If directly place the sample on the testing machine, carry out centre gripping, drawing, because the problem of concrete piece local atress also leads to the breakage of concrete piece easily, is unfavorable for experimental going on.

How to solve the above problems is one of the important problems to be solved urgently in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a clamp for an adhesion strength test, which solves the problems in the prior art and can prevent a concrete block from being broken in the test process.

The utility model provides a clamp for a bonding strength test, which comprises:

the device comprises two clamping plates, a first clamping plate and a second clamping plate, wherein the two clamping plates are used for clamping a sample to be detected from two ends; an avoidance hole is formed in the middle of the clamping plate and is used for being penetrated by the steel bar on the sample;

the clamping plates are arranged on the two sides of the clamping plate, and the clamping plates are matched with the bolts; a plurality of the bolts are evenly distributed around the avoiding hole.

The jig for testing adhesive strength as described above, wherein one side of the holding plate is optionally provided with a groove for receiving one end face of the test piece.

The jig for bonding strength test as described above, wherein optionally, the groove is a rectangular groove;

the lateral wall department of recess is equipped with the guide block, the guide block is followed the opening direction of recess extends, the guide block is kept away from the one end of recess is equipped with the guide part, the guide part is along keeping away from the direction of recess leans out.

The jig for testing adhesive strength as described above, wherein optionally, a connecting portion is provided on the clamping plate, the connecting portion extending toward the opening of the groove;

one end of the connecting part, which is far away from the clamping plate, is connected with a connecting plate; the connecting plate is provided with a connecting hole;

the bolts penetrate through the corresponding connecting holes in the two clamping plates.

The jig for adhesion strength test as described above, wherein the number of the bolts is optionally at least three.

The jig for testing adhesive strength as described above, wherein optionally, a metal gasket is further included;

the metal gasket is positioned between the bolt head of the bolt and the corresponding connecting plate.

The jig for bonding strength test as described above, wherein optionally, further comprising an elastic member;

the elastic elements are sleeved on the corresponding bolts and are positioned between the metal gaskets and the corresponding connecting plates;

and two ends of the elastic element are respectively abutted against the corresponding metal gasket and the corresponding connecting plate.

The clamp for the bonding strength test, as described above, optionally further comprises a limit nut;

the limiting nut is in threaded connection with the corresponding bolt, and the limiting nut is located between the two corresponding connecting plates on the bolt.

The jig for adhesion strength test as described above, wherein the holding plate is optionally a stainless steel plate.

The jig for testing adhesive strength as described above, wherein optionally, the diameter of the avoiding hole is larger than the inner diameter of the sleeve on the sample and smaller than the outer diameter of the sleeve.

The clamping plates are arranged at the two ends of the sample, and the two clamping plates are connected through the bolts, so that the clamping plates are directly contacted with a test instrument during testing. Due to the clamping plate, in the testing process, the contact surface between the sample and the clamping plate is the end surface of the sample, so that the stress area of the sample is increased, and the uneven stress of the concrete block can be prevented in the test.

Through setting up the guide block, can fix a position the sample fast and restrict in the recess of setting for, the convenient quick centre gripping to the sample.

Elastic elements are sleeved on the bolts, so that when the nuts are screwed down, the clamping plate deflection caused by different screwing degrees of different nuts can be avoided, and the clamping plate is fully attached to the end face of the sample.

Drawings

FIG. 1 is a perspective view of a prior art coupon disclosed herein;

FIG. 2 is a perspective view of embodiment 1 of the present invention;

FIG. 3 is an exploded view of embodiment 1 of the present invention;

FIG. 4 is a perspective view of embodiment 2 of the present invention;

FIG. 5 is an exploded view of embodiment 2 of the present invention;

FIG. 6 is a perspective view of embodiment 3 of the present invention;

FIG. 7 is an exploded view of embodiment 3 of the present invention;

fig. 8 is a perspective view of a chucking plate proposed in embodiment 3 of the present invention.

Description of reference numerals:

1-a clamping plate, 2-a sample, 3-a bolt, 4-a nut, 5-a metal gasket, 6-an elastic element and 7-a limiting nut;

11-avoidance holes, 12-grooves, 13-guide blocks, 14-guide parts, 15-connecting parts, 16-connecting plates and 17-connecting holes;

21-steel bar, 22-sleeve, 23-concrete block;

31-bolt head.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.

Referring to fig. 1, for the relative adhesion strength test between epoxy resin coated steel bars and concrete, in the prior art, a sample 2 is usually used, which includes a concrete block 23, steel bars 21 and a sleeve 22, wherein the sleeve 22 is usually made of plastic. Specifically, the reinforcing bars 21 penetrate the concrete block 23 along a center line of the concrete block 23. The sleeve 22 is embedded in the center line of one end face of the concrete block 23, and the reinforcing bar 21 passes through the sleeve 22.

Example 1

Referring to fig. 2 and fig. 3, the present embodiment provides a clamp for adhesion strength test, which is mainly used for clamping a sample in the relative adhesion strength test between an epoxy resin coated steel bar and concrete. Wherein, this anchor clamps include grip block 1, bolt 3 and with the nut 4 of bolt 3 adaptation. The grip block 1 is used for and centre gripping at the both ends of concrete piece 23, and the both ends of sample, the both ends of concrete piece 23 in this application all mean that concrete piece 23 is perpendicular to two terminal surfaces of reinforcing bar.

Specifically, the number of the clamping plates 1 is two, and the two clamping plates 1 are used for clamping the sample 2 to be detected from two ends; the middle part of grip block 1 is equipped with dodges hole 11, dodge hole 11 be used for by reinforcing bar 21 on the sample 2 passes. The number of the bolts 3 is multiple, and the bolts 3 penetrate through the two clamping plates 1 and are in threaded connection with the corresponding nuts 4; a plurality of the bolts 3 are evenly distributed around the avoidance hole 11.

In practice, the bolts 3 pass through the corresponding connecting holes 17 on the two clamping plates 1 and are connected with the corresponding nuts 4. After joining, the bolt 3 should be substantially parallel to the rebar. In practice, the number of bolts 3 should be at least 3, and preferably, the number of bolts 3 is 4.

In use, the two clamping plates 1 are placed at the two ends of the concrete block 23, and the clamping plates 1 are tightly attached to the two ends of the concrete block 23. And a plurality of bolts 3 respectively penetrate through the two clamping plates 1 and are connected with corresponding nuts 4. Until all the nuts 4 are screwed to the proper positions, the two clamping plates 1 are jointed with the two ends of the concrete block 23 and are pressed tightly. During the test, can be directly with drawing the appearance centre gripping reinforcing bar to support a holding plate 1 with drawing the supporting disk of appearance and tightly measure.

If the measurement is performed by a testing machine, the clamping plate 1 and the reinforcing steel bar 21 can be respectively clamped by the testing machine, and then the test is performed.

Because the contact surface is the terminal surface of concrete between grip block and the concrete piece 23, in the test process, can guarantee that the atress of concrete piece 23 is comparatively even, prevent because the cracked concrete that local atress leads to too big.

Example 2

This embodiment is an improvement on the basis of embodiment 1, and the same parts are not described again, and only the differences will be described below.

Referring to fig. 4 and 5, in practice, in order to limit the position of the concrete block 23, a groove 12 for accommodating one end face of the sample 2 is formed on one side of the clamping plate 1. In practice, the groove 12 may be adapted to the end of the concrete block 23, or the bottom surface area of the groove 12 may be larger than the area of the end of the concrete block 23, so that the end of the concrete block 23 can be accommodated in the groove 12. By providing the groove 12, it can be ensured that the concrete block 23 is located in the groove 12 and does not rotate when the bolt 3 is tightened.

In practical implementation, in order to facilitate the end of the concrete block 23 to be inserted into the groove 12, the embodiment is further modified as follows, specifically, the groove 12 is a rectangular groove; in practice, the groove 12 is preferably a square groove, i.e. the bottom of the groove 12 is square.

Furthermore, a guide block 13 is arranged at the side wall of the groove 12, the guide block 13 extends along the opening direction of the groove 12, a guide part 14 is arranged at one end of the guide block 13 far away from the groove 12, and the guide part 14 inclines outwards along the direction far away from the groove 12. In specific implementation, the inner side surface of the guide block 13 is used for limiting the side surface of the concrete block 23. In implementation, the number of the guide blocks 13 is four, and the four guide blocks 13 are respectively located on four side walls of the groove 12.

More specifically, in order to facilitate the guiding, a connecting part 15 is arranged on the clamping plate 1, and the connecting part 15 extends towards the opening direction of the groove 12; one end of the connecting part 15, which is far away from the clamping plate 1, is connected with a connecting plate 16; a connecting hole 17 is formed in the connecting plate 16; the bolt 3 passes through the corresponding connecting holes 17 on the two clamping plates 1. In practice, the guide block 13 may be a metal block. So set up, can also avoid the screw rod to stretch out grip block 1, produce the interference when avoiding experimental.

Example 3

This embodiment is a further improvement on the basis of

embodiment

1 or 2, and the same parts are not described again, and only the differences will be described below:

examples 1 and 2, while relatively sophisticated solutions have been proposed, in particular applications, multiple bolts need to be tightened. When the tightening degree of the bolts is different, the clamping plate 1 is prone to be deviated, and the end face of the concrete block 23 is prone to be stressed unevenly. Thus, the present embodiment is further improved: referring to fig. 6 to 8, the solution proposed in this embodiment further includes a metal gasket 5 and an elastic element 6. In particular, the metal gasket 5 is located between the bolt head 31 of the bolt 3 and the corresponding connecting plate 16. The elastic element 6 is sleeved on the corresponding bolt 3, and the elastic element 6 is positioned between the metal gasket 5 and the corresponding connecting plate 16; two ends of the elastic element 6 respectively abut against the corresponding metal gasket 5 and the corresponding connecting plate 16. In a specific implementation, the elastic element 6 is a coil spring.

Specifically, when the nut 4 is detached from the corresponding bolt 3 after the coil spring is provided, the bolt 3 and the coil spring are easily detached from the chucking plate 1, which complicates the operation. For this reason, the present embodiment is modified as follows:

the embodiment also comprises a limit nut 7; the limit nut 7 is in threaded connection with the corresponding bolt 3, and the limit nut is located between the two corresponding connecting plates 16 on the bolt 3. In practice, there should be a certain distance between two corresponding connecting plates 16. In the use process, after the nut 4 is adjusted in place, the limiting nut 7 is screwed to the position, close to the clamping plate 1, of the nut 4, so that the nut 4 and the limiting nut 7 are located on two sides of the clamping plate 1 respectively and abut against the clamping plate 1 tightly, and the nut 4 can be prevented from loosening in the test process. When the nut 4 is removed after the test is completed, the elastic element 6 and the bolt 3 do not fall off due to the presence of the limit nut 7.

More specifically, in practice, the clamping plate 1 is a stainless steel plate. Of course, other types of steel may be used.

In specific implementation, the diameter of the avoiding hole 11 is larger than the inner diameter of the sleeve 22 on the sample 2 and smaller than the outer diameter of the sleeve 22. So, can guarantee to exert a power to sleeve pipe 22 through grip block 1 when experimental, be favorable to reducing the effort transmission between sleeve pipe 22 and the concrete of week side to between reinforcing bar and the concrete, can improve the measuring accuracy.

The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.

Claims

1. The utility model provides a bonding strength is anchor clamps for experiment which characterized in that includes:

the device comprises two clamping plates (1), wherein the number of the clamping plates (1) is two, and the two clamping plates (1) are used for clamping a sample (2) to be detected from two ends; an avoidance hole (11) is formed in the middle of the clamping plate (1), and the avoidance hole (11) is used for being penetrated by a steel bar (21) on the sample (2);

the clamping device comprises a plurality of bolts (3) and nuts (4) matched with the bolts (3), wherein the bolts (3) penetrate through the two clamping plates (1) and are in threaded connection with the corresponding nuts (4); a plurality of the bolts (3) are uniformly distributed around the avoiding hole (11).

2. The adhesion strength test jig according to claim 1, wherein one side of the holding plate (1) is provided with a groove (12) for receiving one end face of the test piece (2).

3. The jig for bonding strength test according to claim 2, wherein the groove (12) is a rectangular groove;

lateral wall department of recess (12) is equipped with guide block (13), guide block (13) are followed the opening direction of recess (12) extends, guide block (13) are kept away from the one end of recess (12) is equipped with guide part (14), guide part (14) are along keeping away from the direction of recess (12) outwards inclines.

4. The jig for bonding strength test according to claim 3, wherein the holding plate (1) is provided with a connecting portion (15), and the connecting portion (15) extends toward a direction in which the groove (12) opens;

one end of the connecting part (15) far away from the clamping plate (1) is connected with a connecting plate (16); a connecting hole (17) is formed in the connecting plate (16);

the bolts (3) penetrate through the corresponding connecting holes (17) in the two clamping plates (1).

5. The jig for bonding strength test according to claim 4, characterized in that the number of the bolts (3) is at least three.

6. The clamp for bonding strength test according to claim 4, further comprising a metal gasket (5);

the metal gasket (5), the metal gasket (5) is located between the bolt head (31) of the bolt (3) and the corresponding connecting plate (16).

7. The jig for bonding strength test according to claim 6, further comprising an elastic member (6);

the elastic elements (6) are sleeved on the corresponding bolts (3), and the elastic elements (6) are positioned between the metal gaskets (5) and the corresponding connecting plates (16);

two ends of the elastic element (6) are respectively abutted against the corresponding metal gasket (5) and the corresponding connecting plate (16).

8. The clamp for bonding strength test according to claim 7, further comprising a limit nut (7);

the limiting nut (7) is in threaded connection with the corresponding bolt (3), and the limiting nut (7) is located between the two corresponding connecting plates (16) on the bolt (3).

9. The jig for bonding strength test according to any one of claims 1 to 8, wherein the holding plate (1) is a stainless steel plate.

10. The jig for bonding strength test according to any one of claims 1 to 8, wherein the diameter of the relief hole (11) is larger than the inner diameter of a sleeve (22) on the test piece (2) and smaller than the outer diameter of the sleeve (22).