CN113607631A - Bonding slippage testing device and method - Google Patents
Bonding slippage testing device and method Download PDFInfo
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- CN113607631A CN113607631A CN202110712614.2A CN202110712614A CN113607631A CN 113607631 A CN113607631 A CN 113607631A CN 202110712614 A CN202110712614 A CN 202110712614A CN 113607631 A CN113607631 A CN 113607631A
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Abstract
The invention relates to a bonding slippage testing device and a bonding slippage testing method, which belong to the technical field of concrete bridge design. The device can directly test the bonding and sliding characteristics between the main beam and the pavement layer, and further evaluate the stress performance of the main beam under the action of external load.
Description
Technical Field
The invention belongs to the technical field of concrete bridge design, and particularly relates to a bonding slippage testing device and method for a bridge pavement layer and a main beam concrete layer.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Distributed concrete bridges often have concrete pavements on the upper portions of the main beams to enhance the integrity of the transverse multi-piece beams. And a waterproof layer is additionally arranged between the pavement layer and the main beam in the early stage so as to prevent accumulated water from corroding the reinforcing steel bars of the main beam. Along with the increase of the operation time of the bridge and the prevalence of vehicle overload, the bonding performance of the pavement layer and the main beam is degraded, peeling easily occurs under the action of external load, and the stress cannot be coordinated. If design checking calculation is still carried out according to the beam height of the pavement layer, the calculated bearing capacity is overhigh, and the safety coefficient is reduced.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a bonding slippage testing device and a bonding slippage testing method.
The embodiment of the invention provides a bonding slippage testing device, which is characterized in that: the test device comprises a base, wherein a groove for fixing the bottom of a test sample is formed in the base, a horizontal sliding groove is fixed at the top of the base, a roller capable of being in contact with the top surface of the test sample is arranged in the horizontal sliding groove, a displacement sensor capable of being in contact with the outer wall surface of the test sample is arranged on the base, a force application rod horizontally arranged is arranged on one side of the base, the axis of the force application rod is parallel to the axis of the horizontal sliding groove, the end part of the force application rod is provided with a fixing ring capable of being sleeved on the test sample, and a force sensor is arranged on the force application rod.
Furthermore, the base is provided with a support capable of ascending and descending up and down, and the horizontal sliding groove is arranged on the support.
Further, the end of the force application rod is hinged with the fixing ring.
Furthermore, a reaction frame is arranged on one side of the base and is fixed, and the force application rod is arranged on the reaction frame and can move up and down on the reaction frame.
Furthermore, a baffle plate for adjusting the movement of the force application rod is arranged on the reaction frame.
Furthermore, a servo jack connected with the end part of the force application rod is arranged on the reaction frame.
Furthermore, a fixing rod is obliquely arranged on the base, and the displacement sensor is arranged at the end part of the fixing rod.
Furthermore, the opening of the U-shaped ring is connected through a fastening bolt, and a soft protective sleeve is arranged on the inner wall surface of the U-shaped ring.
Further, the base is provided with a three-jaw chuck for clamping the test specimen.
The embodiment of the invention also provides a test method of the bonding slippage test device based on any one of the above, which comprises the following steps:
vertically fixing a sample with two layers of materials on a base, and enabling a horizontal chute at the top of the base to be in contact with the top of the sample;
sleeving a fixing ring on the outer wall surface of the upper layer material of the sample, and adjusting the levelness of the force application rod;
installing a displacement sensor and debugging a test system, and pre-loading through a force application rod to eliminate a gap between a test sample and a connecting part in the device; then, horizontal stretching is realized through a force application rod, and the stretching force and the relation between the displacement of the upper layer material and the lower layer material of the sample in the stretching process are recorded; and stopping loading until the upper layer material and the lower layer material of the sample are separated.
The invention has the following beneficial effects:
the bonding slippage testing device provided by the invention is simple and convenient, the lower layer material of the test sample is fixed by the base, the horizontal force is applied to the upper layer material of the test sample by the fixing ring, the magnitude of the applied force of the upper layer material is detected by the force sensor, and meanwhile, the displacement of the upper layer material can be detected by the displacement sensor on the base, so that the bonding slippage relation between the pavement layer and the main beam layer in the existing distributed concrete bridge can be directly tested, and the bonding characteristic of the interface is truly reflected. Meanwhile, the horizontal sliding groove at the top of the base and the roller in the horizontal sliding groove realize that the sample is only acted by horizontal shearing force, and the accuracy of the test is ensured.
Drawings
FIG. 1 is a schematic structural diagram of a slippage testing device provided by an embodiment of the invention;
FIG. 2 is a schematic view of a clamping device provided in an embodiment of the present invention;
fig. 3 is a schematic view of the fastening device of the present invention.
In the figure: 1. servo jack, 2, vertical displacement adjusting device, 3, reaction support, 4, force sensor, 5, connecting hinge, 6, force rod, 7, solid fixed ring, 8, snap ring fixing bolt, 9, clamping slide block, 10, clamping groove, 11, displacement sensor, 12, roller, 13, vertical stop device, 14, cylinder sample.
Detailed Description
As shown in fig. 1, the embodiment of the invention provides a device for testing bonding slippage between a bridge pavement layer and a main beam concrete, which mainly comprises a base 10 fixed on the ground, wherein the base 10 is used for fixing a cylindrical sample 14 with the bridge pavement layer and the main beam concrete layer, the base 10 is mainly used for fixing the main beam concrete layer in a test product layer, one side of the base 10 is provided with a force rod 4, the force rod 4 can apply force in the horizontal direction, the end part of the force rod 4 is sleeved on the bridge pavement layer in the cylindrical sample 14 through a fixing ring 7, and thus, the force rod 4 applies horizontal force to perform the bonding slippage testing on the main concrete layer in the cylindrical sample 14 and the bridge pavement layer.
It is assumed that the upper layer of the cylindrical sample 14 in this embodiment is a bridge pavement layer, and the lower layer is a main beam concrete layer, or the upper layer may be a main beam concrete layer, and the upper layer is a bridge pavement layer.
Specifically, in the embodiment of the present invention, a groove for fixing the test sample is provided on the upper surface of the base 10, the diameter of the groove is generally equal to the diameter of the test sample, and the main beam concrete layer on the lower layer of the test sample can be directly vertically inserted into the groove of the base 10, so as to ensure the vertical fixing of the main beam concrete layer.
The top of base 10 is vertical stop device 13 of fixedly connected with still, and this vertical stop device 13 includes the roof that a level was placed, is equipped with the spout on the lower surface of this roof, and the top on test sample's bridge pavement layer is installed in the spout, is equipped with one row of roller bearing 12 on the bottom surface of this spout simultaneously, and this roller bearing 12 contacts with test sample's top surface, the roller bearing can realize the horizontal frictionless displacement of sample. When applying horizontal force for the test sample upper strata through solid fixed ring 7 like this, the top through roller bearing 12 in the roof contacts and the vertical limiting displacement of spout with test sample, can guarantee that test sample only receives the effect of horizontal shear force, and the top no longer receives the influence of frictional force, has guaranteed the accuracy of test, has avoided the influence of external factor to the test result, can be used to the adhesion evaluation between layer of mating formation and the girder.
In the embodiment of the invention, the sliding groove can be a rectangular groove, considering that the test sample is generally cylindrical or rectangular, the width of the rectangular groove is generally equal to or greater than the diameter or width of the test sample, but the length of the rectangular groove is greater than the diameter or length of the test sample, so that the top of the pavement layer can still slide in the sliding groove when the pavement layer and the main beam layer in the test sample are slightly displaced.
In this implementation roof length direction's both ends are through installing at base 10 through a guide bar respectively be equipped with the guiding hole that can hold the guide bar on the base 10, the guide bar can be in the guiding hole up-and-down motion and fix on a certain position, and the roof can be according to the height of different test sample like this, along with the height of adjustment self for the device can adapt to the test sample of co-altitude not.
Of course, in other embodiments, the top plate may not be fixed on the base, and a fixing frame may be provided on the upper portion of the base 10, and the top plate is disposed on the fixing frame and can move up and down.
Further, in this embodiment, a counter-force bracket 3 is further arranged on one side of the base 10, a horizontally placed force rod 3 is arranged on the counter-force bracket 3, the end of the force rod 3 is connected with a fixing ring 7, the fixing ring 7 can be sleeved on the outer surface of a test sample, the other end of the fixing ring is connected with a servo jack 1 on the counter-force bracket 3, the servo jack 1 can realize micro displacement loading, when the test sample is fixed on the base 10, the fixing ring on the force rod can be sleeved above the junction of the bridge pavement layer and the main beam concrete of the test sample, and a certain horizontal force is gradually applied to the fixing ring 7 through the servo jack 1, so that the sliding test between the bridge pavement layer and the main beam concrete is realized.
As shown in fig. 2, the fixing ring 7 in this embodiment is a U-shaped ring, the opening of which forms a closed space by a snap ring fixing bolt 8, and the force application is mainly realized by the contact of the U-shaped ring with the outer wall surface of the test sample.
The inner side of the fixing ring is provided with a soft protective sleeve, so that the damage to the sample 14 caused by the overlarge clamping force is prevented when a force is applied through the U-shaped ring.
In the embodiment of the invention, the force sensor 4 is arranged on the force rod 6, so that the force can be observed at any time when the servo jack 1 applies force, and meanwhile, the base 10 is provided with a fixing rod which is obliquely arranged, wherein the end part of the fixing rod is connected with a displacement sensor 11 which is horizontally arranged, and the displacement sensor 11 can be in direct contact with the outer wall of a test sample after being installed.
Therefore, when the bonding slippage testing device provided by the implementation of the invention is used for testing the bonding slippage characteristic between the main beam layer and the pavement layer in the sample, the stress condition and the displacement condition of the main beam layer under the action of an external load can be judged through the force sensor 4 and the displacement sensor 11.
Further, in this embodiment, the end of the force rod 6 is hinged to the fixing ring 7 through the connecting hinge 5, and the force rod 6 and the fixing ring can rotate relatively, and meanwhile, the force rod 6 directly penetrates through the reaction frame 3, and the force rod is fixed on the reaction frame 3 through the vertical displacement adjusting device 2, so that the height of the force rod is adjusted through the vertical displacement adjusting device 2, and therefore before the test sample is subjected to bonding slippage test, the vertical displacement adjusting device 2 can be adjusted in advance, and the centers of the servo jack 1, the force sensor 4, the connecting hinge 5 and the stretching connecting rod 6 are aligned with the center of the pavement layer on the upper portion of the test sample 14.
It will be appreciated that the vertical displacement adjustment means 2 in this embodiment may be a support plate that moves up and down, by means of which the level of the force bar 6 is adjusted.
Referring to fig. 3, the fixing base 10 in this embodiment may be a three-jaw chuck, three clamping sliders 9 are arranged in the circumferential direction of the three-jaw chuck, and the bottom of the three-jaw chuck is directly fixed on the bottom 10 through bolts, so that the lower layer of the test sample is directly clamped by the three-jaw chuck, and the stability in the process is ensured.
It should be noted that if a three-jaw chuck is provided, the groove on the base 10 can be omitted, and the three-jaw chuck can adapt to test samples with different diameters by matching with the top sliding groove.
The following describes in detail a testing method based on the above testing device for testing the concrete adhesion slip of the bridge pavement layer and the main beam, and the method includes the following steps:
the device corresponds to the following specific operation method:
step (1):
and vertically taking out the protective layer and the main beam cylinder sample. Vertically fixing a sample in a base 10 in the device, moving a clamping slide block 9 in an annular manner to clamp the sample 14, and installing rollers 12 and a vertical limiting device 13 at the top of the sample 14 to limit the rotation and vertical displacement of the sample;
step (2):
the centers of the servo jack 1, the force sensor 4, the connecting hinge 5 and the force rod 6 are aligned with the center of the pavement layer on the upper part of the sample by adjusting the vertical displacement adjusting device 2;
and (3):
the upper part of the sample is fastened by using a clamping device, the inside of the fixing ring 7 is in full contact with the side surface of the sample, and the clamping ring fixing bolt 8 is screwed tightly. A fixed ring 7 in the clamping device and a force rod 6 in the stretching device are fixed through a connecting hinge 4;
and (4):
and (3) installing a displacement sensor 4, debugging a test system, and starting the preloading of the servo jack 1 to eliminate the gap of the connecting part. And starting the servo jack 1 to realize formal horizontal low-speed displacement stretching, and recording the relationship between the stretching force and the displacement of the upper part of the sample in the stretching process. And stopping loading until the upper part and the lower part of the sample are separated.
The testing method of the embodiment realizes that the sample is only acted by the horizontal shearing force, ensures the accuracy of the test, avoids the influence of external factors on the test result, and can be used for evaluating the adhesion between the pavement layer and the main beam.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. The utility model provides a bonding testing arrangement that slides which characterized in that: the test device comprises a base, wherein a groove for fixing the bottom of a test sample is formed in the base, a horizontal sliding groove is fixed at the top of the base, a roller capable of being in contact with the top surface of the test sample is arranged in the horizontal sliding groove, a displacement sensor capable of being in contact with the outer wall surface of the test sample is arranged on the base, a force application rod horizontally arranged is arranged on one side of the base, the axis of the force application rod is parallel to the axis of the horizontal sliding groove, the end part of the force application rod is provided with a fixing ring capable of being sleeved on the test sample, and a force sensor is arranged on the force application rod.
2. The adhesion slippage testing device of claim 1, wherein the base is provided with a support capable of moving up and down, and the horizontal sliding groove is arranged on the support.
3. A stick slip test apparatus as claimed in claim 1 wherein the end of the force application lever is hinged to the retaining ring.
4. A test device for adhesion slip as claimed in claim 3, wherein a reaction frame is provided at one side of the base, the reaction frame is fixed, and the force application rod is provided on the reaction frame and can move up and down on the reaction frame.
5. A test device for adhesion slip as in claim 4 wherein a stop is provided on the reaction frame to adjust the movement of the force application bar.
6. A bond slip testing device as claimed in claim 4 wherein the reaction frame is provided with a servo jack attached to the end of the force application rod.
7. The adhesion slip test device of claim 1, wherein a fixing bar is provided on the base to be placed obliquely, and the displacement sensor is provided at an end of the fixing bar.
8. The adhesion slippage testing device of claim 1, wherein the fixing ring is a U-shaped ring, an opening of the U-shaped ring is connected by a fastening bolt, and a soft protective sleeve is provided on an inner wall surface of the U-shaped ring.
9. A stick slip test device according to claim 1 wherein the base is provided with a three jaw chuck for gripping the test specimen.
10. The method for testing a bonding slip test apparatus according to any one of claims 1 to 9,
vertically fixing a sample with two layers of materials on a base, and enabling a horizontal chute at the top of the base to be in contact with the top of the sample;
sleeving a fixing ring on the outer wall surface of the upper layer material of the sample, and adjusting the levelness of the force application rod;
installing a displacement sensor and debugging a test system, and pre-loading through a force application rod to eliminate a gap between a test sample and a connecting part in the device; then, horizontal stretching is realized through a force application rod, and the stretching force and the relation between the displacement of the upper layer material and the lower layer material of the sample in the stretching process are recorded; and stopping loading until the upper layer material and the lower layer material of the sample are separated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110712614.2A CN113607631A (en) | 2021-06-25 | 2021-06-25 | Bonding slippage testing device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110712614.2A CN113607631A (en) | 2021-06-25 | 2021-06-25 | Bonding slippage testing device and method |
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| CN113607631A true CN113607631A (en) | 2021-11-05 |
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| CN202110712614.2A Pending CN113607631A (en) | 2021-06-25 | 2021-06-25 | Bonding slippage testing device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114295968A (en) * | 2021-11-19 | 2022-04-08 | 国网浙江省电力有限公司金华供电公司 | SF6 density relay calibration equipment based on temperature compensation |
| CN114325364A (en) * | 2021-11-19 | 2022-04-12 | 国网浙江省电力有限公司金华供电公司 | SF6 density relay online verification method |
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| CN110702516A (en) * | 2019-10-18 | 2020-01-17 | 东莞理工学院 | Direct tensile test device for FRP (fiber reinforced Plastic) reinforcement concrete member and use method |
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2021
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| CN203011765U (en) * | 2012-10-24 | 2013-06-19 | 中华人民共和国上海出入境检验检疫局 | Special clamping device matched with pipe ring stretching test |
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| CN207336254U (en) * | 2017-09-21 | 2018-05-08 | 广东金东建设工程公司 | Potable weak and soft layer band in-situ direct shear test instrument |
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| CN114295968A (en) * | 2021-11-19 | 2022-04-08 | 国网浙江省电力有限公司金华供电公司 | SF6 density relay calibration equipment based on temperature compensation |
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Effective date of registration: 20220422 Address after: 250061, No. ten, No. 17923, Lixia District, Ji'nan City, Shandong Province Applicant after: SHANDONG University Applicant after: Shandong high speed Construction Management Group Co.,Ltd. Applicant after: Shandong University (Qihe) Institute of new materials and intelligent equipment Address before: 250061, No. ten, No. 17923, Lixia District, Ji'nan City, Shandong Province Applicant before: SHANDONG University Applicant before: Shandong high speed Construction Management Group Co., Ltd |
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