CN211013861U - Simple bending creep test device - Google Patents
Simple bending creep test device Download PDFInfo
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- CN211013861U CN211013861U CN201921955942.XU CN201921955942U CN211013861U CN 211013861 U CN211013861 U CN 211013861U CN 201921955942 U CN201921955942 U CN 201921955942U CN 211013861 U CN211013861 U CN 211013861U
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Abstract
The utility model relates to a simple and easy crooked creep test device, including base, clamp plate, connecting rod, link plate, lever, support and fixed pulley, the clamp plate be the clamp plate that has the boss, base, support and fixed pulley set up subaerially through the bolt respectively, the connecting rod both ends are connected with link plate respectively, during the experiment, from supreme down place clamp plate and test piece on the base in proper order, placed link plate I on the clamp plate of top, this link plate I both ends are connected with the connecting rod respectively, the connecting rod other end is connected with link plate II respectively, link plate II is located the clamp plate of bottom, the lever sets up on the support, the lever is connected with the connecting rod through cable wire and fixed pulley from the one end that the support is close to, the cable wire passes the fixed pulley, cable wire one end is connected with lever one end, the cable wire other end is connected with link plate II; a load is applied to the other end of the lever. The loading direction is changed through the fixed pulley, the loading force is amplified through the lever, and the use is simple and convenient.
Description
Technical Field
The utility model relates to a test device, especially a simple and easy crooked creep test device.
Background
Creep, which is a time-varying property inherent to concrete itself, has a significant effect on the stress and deformation of the concrete structure. Creep of the concrete is always present as long as concrete is present in the structure. As long as the structure is sensitive to the deformation of the concrete, the creep effect analysis of the concrete is an indispensable part in the structural analysis.
The experimental devices currently used to measure concrete creep mainly include measurements of compressive creep, tensile creep and flexural creep. The concrete has higher compressive strength, is mainly used for load-bearing members, has relatively more research on compression creep, and has the main concrete compression creep test methods of American ASTMC512-02, British BSISO1920-9:2009, Chinese GB/T50082-2009 and the like in standard environments at home and abroad. The concrete material has low tensile strength, the tensile deformation of the concrete material is usually not negligible, but the tensile creep has large discreteness due to small measured strain value, and the test method mainly comprises two types of direct tensile test and constrained shrinkage test. Unlike the direct tensile test, the constrained shrinkage test is closer to the real process.
Compared with the complexity of a tensile creep test device, the bending creep test device is a compromise scheme, the device is easy to realize in design, and meanwhile, the long-term tensile deformation performance of a test piece can be measured. The loading modes include lever type, spring type, jack and the like. The main problems of the existing test device are mainly focused on the aspects of voltage stabilization measures, deformation measurement, higher cost and the like.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the lever pulley type bending creep test device changes the loading direction through the fixed pulley, realizes the amplification of loading force through the lever, and is simple and convenient to use. The problem of small test piece bending creep test device load complicacy is solved.
The technical scheme for solving the technical problems is as follows: a simple bending creep test device comprises a base, a pressing plate, a connecting rod, a connecting plate, a lever, a support and a fixed pulley, wherein the pressing plate is a pressing plate with bosses, the base, the support and the fixed pulley are arranged on the ground through studs and nuts respectively, the pressing plate is provided with a plurality of blocks, the pressing plate comprises a pressing plate with 2 bosses on one end surface and pressing plates with 2 bosses on two end surfaces respectively, the two surfaces of the pressing plate are provided with 2 bosses respectively, the surface A of the pressing plate is provided with 2 bosses A, the surface B of the pressing plate is provided with 2 bosses B, the distance between the 2 bosses A is larger than the distance between the 2 bosses B, the two ends of the connecting rod are connected with the connecting plate respectively, during test, the pressing plate and test pieces are placed on the base from bottom to top in sequence, the surface A of all the pressing plates faces up or the surfaces B of all the pressing plates face up, the pressing plate is placed above and below each test, the device comprises a base, a pressure plate, a lever, a fixed pulley, a connecting plate I, a connecting rod, a connecting plate II, a steel cable, a fixed pulley, a steel cable and a connecting plate II, wherein 2 bosses B on one pressure plate are positioned in the middle of one end surface of a test piece, 2 bosses A on the other pressure plate are positioned at two end positions of the other end surface of the test piece; a load is applied to the other end of the lever.
The utility model discloses a further technical scheme is: still include load sensor, this load sensor is located on the clamp plate of topmost department, and is located even board I under.
The device also comprises a strain gauge, wherein the strain gauge is attached to the test piece.
The other end of the lever applies a load through a weight or a weight.
The connecting plates are respectively arranged at two ends of the connecting rod through nuts, threads are arranged at two ends of the connecting rod, connecting rod holes are arranged at two ends of the connecting plates, the connecting rod penetrates through the connecting rod holes, and the connecting plates are arranged on the connecting rod through the nuts corresponding to the connecting rod threads.
During the test, the test piece is cast and molded by a concrete test mold and then placed for 28 days under the conditions of constant temperature and constant humidity.
The load applied was 70% of the specimen failure load (or other stress level) and the load was held constant for 90 days (or desired loading age).
During the experiment, from supreme clamp plate and the test piece of placing in proper order down, the clamp plate has been placed respectively to every test piece below, and the A face of clamp plate all faces up, and the B face of clamp plate all faces down, and 2 boss B of the clamp plate lower surface of test piece top are located the middle part position of test piece up end, and 2 boss A of the clamp plate upper surface of test piece below are located the both ends position of terminal surface under the test piece, and then make every test piece all carry out 4 point bending test.
The pressing plate also comprises a pressing plate with one surface only provided with 2 bosses A and a pressing plate with one surface only provided with 2 bosses B.
Since the technical scheme is used, the utility model relates to a simple and easy crooked creep test device has following beneficial effect:
1. the utility model discloses a lever loading, not only the loading is convenient, still can be laborsaving, designs different power arm and resistance arm, can reach different amplification factors. The fixed pulley is adopted for loading, the loading direction can be changed, lever type loading is realized, the loading direction is from bottom to top, and the loading direction is from top to bottom after the fixed pulley passes through, so that the daily loading habit is better met. The steel cable is fixed on the connecting plate (steel plate), so that the loading direction is more reliable, and the deflection of the loading direction is avoided. Meanwhile, the creep test of the three test pieces can be completed simultaneously by matching the device with a pressure plate, a pull rod, a sensor and the like. The utility model discloses simple structure, convenient operation conveniently applies the load to little test piece very much, can extensively use widely, the utility model discloses practical wide range not only can be used to the concrete sample 4 points crooked creep test, also can accomplish other combined material's bending deformation simultaneously experimental.
2. The utility model discloses a key is creep test device's simplification, the specially adapted small test piece, because joint lever and fixed pulley carry out the loading, therefore the test method is simple relatively. Adopt the utility model discloses the device is experimental, and is not big with conventional creep test device gained data difference in numerical value, but the device has adopted lever pulley gear, therefore is simple relatively, convenient on loading and experimentation. The loading direction is changed through the fixed pulley, the loading force is amplified through the lever, and the use is simple and convenient.
The technical features of a simple creep bending test apparatus according to the present invention will be further described with reference to the drawings and specific examples.
Drawings
FIG. 1: the present embodiment is a schematic structural view of a simple creep bending test apparatus.
FIG. 2: the present embodiment is a schematic structural view of a simple creep bending test apparatus.
FIG. 3: the structure of the lever in this embodiment is schematically illustrated.
In the above drawings, the respective reference numerals are explained as follows:
1-base, 2-pressing plate, 3-connecting rod, 4-connecting plate, 5-lever, 6-support, 7-fixed pulley, 8-steel cable, 9-test piece and 10-load sensor.
Detailed Description
The simple bending creep test device comprises a base, a pressing plate, a connecting rod, a connecting plate, a lever, a support, a fixed pulley, a load sensor and a strain gauge, wherein the pressing plate is a pressing plate with bosses, the base, the support and the fixed pulley are arranged on the ground through studs and nuts respectively, the pressing plate is provided with a plurality of blocks, the pressing plate comprises a pressing plate with one end face provided with 2 bosses and pressing plates with two end faces provided with 2 bosses respectively, the two faces of the pressing plate are provided with 2 bosses respectively, for convenience of description, the upper surface of the pressing plate is defined as an A face, the lower surface of the pressing plate is a B face, the A face of the pressing plate is provided with 2 bosses A, the B face of the pressing plate is provided with 2 bosses B, and the distance between the 2 bosses A is greater than the distance between the 2 bosses B. The clamp plate still includes that the one side only is equipped with the clamp plate of 2 boss A and the one side only is equipped with the clamp plate of 2 boss B, and the clamp plate that only one side was equipped with the boss conveniently is used for bottom and top. The clamp plate can be the clamp plate of polylith variation in size, and then can carry out the test piece experiment of equidimension not, and the connecting rod can be many different connecting rods of length, can choose for use the connecting rod of same length during the use. Two ends of the connecting rod are respectively connected with the connecting plate. During testing, a pressing plate and a test piece are sequentially placed on a base from bottom to top, when the pressing plate is placed, the A surfaces of all the pressing plates face upwards (or the B surfaces of all the pressing plates face upwards), the pressing plate is respectively placed on the upper part and the lower part of each test piece, 2 bosses B on one pressing plate are positioned in the middle of one end surface of each test piece, 2 bosses A on the other pressing plate are positioned at the two ends of the other end surface of each test piece, in the embodiment, the A surfaces of the pressing plates face upwards, the B surfaces of the pressing plates face downwards, the pressing plates are respectively placed on the upper part and the lower part of each test piece, 2 bosses B on the lower surface of the pressing plate above each test piece are positioned in the middle of the upper end surface of each test piece, 2 bosses A on the upper surface of the pressing plate below each test piece are positioned at the two ends of the lower end surface of each test piece, the other end of the connecting rod is respectively connected with a connecting plate II, the connecting plate II is positioned below the pressure plate at the bottommost end, the lever is arranged on the support, one end, close to the support, of the lever is connected with the connecting rod through a steel cable and a fixed pulley, the steel cable penetrates through the fixed pulley, one end of the steel cable is connected with one end of the lever, and the other end of the steel cable is connected with the connecting plate II; during the experiment, the load is applyed to the lever other end, makes the lever other end push down through applying the load, and the one end pull-up cable wire one end that the lever is connected with the cable wire is drawn down even board II under the cable wire other end, and even board II is drawn down even board I through the connecting rod, and even board I is exerted pressure to the clamp plate of topmost department for from last clamp plate under to all exert pressure to the test piece of its below down, and then can test. Load sensor is located on the clamp plate of topmost department and is located even board I down, can obtain even the pressure that board I pushed down through load sensor. And the strain gauge is attached to the test piece, and the deformation value of the middle part of the test piece is measured through the strain gauge. The other end of the lever applies a load through a weight or a weight. The connecting plates are connected with the connecting rods through nuts respectively, threads are arranged at two ends of each connecting rod, connecting rod holes are arranged at two ends of each connecting plate respectively, the connecting rods penetrate through the connecting rod holes, and the connecting plates are arranged on the connecting rods through the nuts corresponding to the connecting rod threads. During the test, the test piece is cast and molded by a concrete test mold, placed for 28 days under the conditions of constant temperature and constant humidity, and then used for the test. The applied load is 70% of the specimen failure load (or other stress level) and the specimen middle deformation can be achieved for 90 days (or other loading age) by keeping the load constant for 90 days (or other loading age).
The placing method of the pressing plate and the test piece comprises the following steps: the pressing plate and the test piece are placed in sequence from bottom to top, the pressing plate is placed on the upper side and the lower side of each test piece respectively, 2 bosses B on the lower surface of the pressing plate above the test piece are located in the middle of the upper end surface of the test piece, 2 bosses A on the upper surface of the pressing plate below the test piece are located at two ends of the lower end surface of the test piece, and therefore each test piece is subjected to a 4-point bending test, for example, a first pressing plate is placed on a base, a first test piece is placed on 2 bosses A of the first pressing plate, at the moment, 2 bosses A on the first pressing plate are located at two ends of the first test piece respectively, a second pressing plate is placed on the first test piece, at the moment, 2 bosses B on the second pressing plate are located at a position close to the middle of the first test piece respectively, similarly, a second test piece is placed on 2 bosses A of the second pressing plate, a third pressing plate is placed on, a fourth platen is placed on the third specimen, and the platen and specimen are placed in this manner until the appropriate height is reached, for example 3-5 specimens can be placed for a single use. The connecting rod quantity is 2, and even board quantity is 2, and these 2 even boards set up respectively in the both ends of 2 connecting rods, and 2 even boards set up respectively in the both ends of 2 connecting rods through the nut, and the connecting rod both ends are equipped with the screw thread, and even board both ends are equipped with 2 connecting rod holes, and the connecting rod passes the connecting rod hole to will link the board and set up on the connecting rod through the nut corresponding with the connecting rod screw thread. The connecting rod with the proper length can be selected according to the test requirement, and a plurality of test pieces to be tested and the corresponding pressing plates can be selected. The connecting plate I positioned at one end of the connecting rod is placed on the pressure plate at the topmost position, and the connecting plate II positioned at the other end of the connecting rod is positioned below the first pressure plate. The lever is arranged on the support, one end, close to the support, of the lever is connected with the connecting rod through a steel cable and a fixed pulley, the steel cable penetrates through the fixed pulley, one end of the steel cable is connected with one end of the lever, and the other end of the steel cable is connected with the connecting plate II; during the experiment, the load is applyed to the lever other end, makes the lever other end push down through applying the load, and the one end pull-up cable wire one end that the lever is connected with the cable wire is drawn down even board II under the cable wire other end, and even board II is drawn down even board I through the connecting rod, and even board I is exerted pressure to the clamp plate of topmost department for from last clamp plate under to all exert pressure to the test piece of its below, and then can test.
The specific embodiment is as follows: a simple bending creep test device (lever pulley type creep test device) comprises a lever, a support, a steel cable, a fixed pulley, a connecting plate (steel plate), a connecting rod, a load sensor, a pressing plate with a boss, a stud, a nut, a displacement meter, a dial indicator, a steel frame, a strain gauge and the like. The support, the fixed pulley and the steel plate are arranged on the ground through a stud and a nut respectively. The lever is arranged on the support, one end of the lever is connected with the connecting rod through the steel cable and the fixed pulley, the connecting rod is connected with the connecting plate, and the connecting plate and the pressing plate are sequentially placed. The lever-type pulley loading device can be directly loaded, the pressing plate and the test piece with the boss in the loading direction can be changed through the fixed pulley, the pressing plate is placed on the upper portion and the lower portion of each test piece respectively, the pulling plate is connected with one end of the lever, the load is applied to the other end of the lever, and then the pressing plate with the boss applies pressure to apply pressure to the test piece so as to perform tests, and the lever-type pulley loading device can achieve the labor-saving effect. The lever can realize laborsaving loading, and the fixed pulley realizes changing the loading direction, and the clamp plate that has the boss can accomplish the four-point bending test of test piece to can accomplish three test pieces (or 1, 2, 4, 5, or many) simultaneously, double-screw bolt and nut are used for fixed steelframe (base), fixed pulley and lever etc.. The steel cable is used for transmitting loading force, and the load sensor and the displacement meter are used for measuring load applied to the test piece and deflection generated in the middle of the test piece. The steel frame plays a role in supporting and fixing. After a concrete test piece is cast and molded, the concrete test piece is maintained for 28 days under the conditions of constant temperature and constant humidity and then used for testing, three test pieces are placed on a creep testing device at one time, a load is applied to one end of a lever, a weight can be directly used for loading, meanwhile, a strain gauge is attached to a pure bending section of the test piece, the extension and compression deformation of a tensile section and a compression section of the test piece are measured, and a displacement meter is arranged on the lower portion of the middle point of the test piece and used for measuring the deflection of the middle point. Applying 70% of the specimen's failure load (or other stress level) and holding the load constant for 90 days (or desired loading age) will result in 90 day (or other loading age) specimen center deformation and further creep.
According to the embodiment, the loading direction is changed through the fixed pulley, the loading force is amplified through the lever, and the use is simple and convenient. The lever pulley type creep test device can increase the loading force according to the length ratio of the power arm and the resistance arm, and the acting direction is changed through the fixed pulley to act the force on the concrete test piece. During the loading process, the direction of the loading force is kept downward, and the direction of the loading force cannot be changed due to the forward and backward rotation of the lever. A plurality of (3 in the attached drawing) concrete bending test pieces can be loaded at the same time, each test piece is bent at 4 points, when the loading force is large, the weight of the test piece can be ignored, but when the load is small, the weight of the concrete test piece must be considered. The load sensor is arranged on the uppermost test piece, the actual loading force of each layer of test piece can be measured by using the load sensor, and the load is loaded through two bosses (bosses with small cylindrical structures) below the pressing plate. The lever is connected with the pulley through a steel wire rope (steel cable), when load is transmitted to the steel wire rope through the lever, the acting direction is changed through the fixed pulley, and the load is distributed to the concrete test piece through the connecting rod and the lug bosses on the pressing plate. The concrete bending test device is characterized in that the side faces of three concrete bending test pieces with the same size are ground flat and placed in a steel frame of the bending test device, so that the side faces are positioned on a compression surface. The load sensor is placed on the uppermost test block, and the load is transmitted to the test piece through the sensor. The external load is added to one end of the lever, the other end of the lever is transmitted to a connecting plate at the lower part of the loading steel frame through a steel cable tied on the lever through a fixed pulley, the lower connecting plate further transmits the load to a connecting plate on the steel frame through a pull rod, and finally the load is transmitted to the test piece through a sensor. The entire loading unit must be firmly fixed to the ground. The four-point bending test piece generates pure bending deformation in the middle, the axial strain and the Poisson ratio can be measured by attaching a strain gauge, and the deflection of the test piece can be measured by a displacement meter.
Claims (9)
1. A simple bending creep test device is characterized in that: the test device comprises a base, a pressing plate, a connecting rod, a connecting plate, a lever, a support and a fixed pulley, wherein the pressing plate is a pressing plate with bosses, the base, the support and the fixed pulley are arranged on the ground through studs and nuts respectively, the pressing plate is provided with a plurality of blocks, the pressing plate comprises a pressing plate with 2 bosses on one end surface and pressing plates with 2 bosses on two end surfaces respectively, wherein the two surfaces of the pressing plate are provided with 2 bosses respectively, the A surface of the pressing plate is provided with 2 bosses A, the B surface of the pressing plate is provided with 2 bosses B, the distance between the 2 bosses A is larger than that of the 2 bosses B, the two ends of the connecting rod are connected with the connecting plate respectively, during test, the pressing plate and a test piece are placed on the base from bottom to top in sequence, the A surfaces of all the pressing plates face up or the B surfaces of all the pressing plates face up, the pressing plate is placed on the upper side and the lower side of each, the other press plate is provided with 2 bosses A which are positioned at two ends of the other end surface of the test piece, the press plate at the topmost end is provided with a connecting plate I, two ends of the connecting plate I are respectively connected with a connecting rod, the other end of the connecting rod is respectively connected with a connecting plate II, the connecting plate II is positioned below the press plate at the bottommost end, the lever is arranged on the support, one end of the lever close to the support is connected with the connecting rod through a steel cable and a fixed pulley, the steel cable penetrates through the fixed pulley, one end of the steel cable is connected with one end of the lever, and the other end; a load is applied to the other end of the lever.
2. The simple creep bend test apparatus according to claim 1, wherein: still include load sensor, this load sensor is located on the clamp plate of topmost department, and is located even board I under.
3. The simple creep bend test apparatus according to claim 1, wherein: the device also comprises a strain gauge, wherein the strain gauge is attached to the test piece.
4. The simple creep bend test apparatus according to claim 1, wherein: the other end of the lever applies a load through a weight or a weight.
5. The simple creep bend test apparatus according to claim 1, wherein: the connecting plates are respectively arranged at two ends of the connecting rod through nuts, threads are arranged at two ends of the connecting rod, connecting rod holes are arranged at two ends of the connecting plates, the connecting rod penetrates through the connecting rod holes, and the connecting plates are arranged on the connecting rod through the nuts corresponding to the connecting rod threads.
6. The simple creep bend test apparatus according to claim 1, wherein: during the test, the test piece is cast and molded by a concrete test mold and then placed for 28 days under the conditions of constant temperature and constant humidity.
7. The simple creep bend test apparatus according to claim 1, wherein: the applied load was 70% of the test piece failure load and the load was held constant for 90 days.
8. The simple creep bend test apparatus according to claim 1, wherein: during the experiment, from supreme clamp plate and the test piece of placing in proper order down, the clamp plate has been placed respectively to every test piece below, and the A face of clamp plate all faces up, and the B face of clamp plate all faces down, and 2 boss B of the clamp plate lower surface of test piece top are located the middle part position of test piece up end, and 2 boss A of the clamp plate upper surface of test piece below are located the both ends position of terminal surface under the test piece, and then make every test piece all carry out 4 point bending test.
9. The simple creep bend test apparatus according to claim 1, wherein: the pressing plate also comprises a pressing plate with one surface only provided with 2 bosses A and a pressing plate with one surface only provided with 2 bosses B.
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|---|---|---|---|
| CN201921955942.XU CN211013861U (en) | 2019-11-13 | 2019-11-13 | Simple bending creep test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921955942.XU CN211013861U (en) | 2019-11-13 | 2019-11-13 | Simple bending creep test device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112504587A (en) * | 2020-12-02 | 2021-03-16 | 西安建筑科技大学 | Device and method for testing bending creep strain of concrete continuous beam bridge under lever holding load |
| CN112858040A (en) * | 2021-02-25 | 2021-05-28 | 西南交通大学 | Concrete beam multipoint bending test device |
-
2019
- 2019-11-13 CN CN201921955942.XU patent/CN211013861U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112504587A (en) * | 2020-12-02 | 2021-03-16 | 西安建筑科技大学 | Device and method for testing bending creep strain of concrete continuous beam bridge under lever holding load |
| CN112504587B (en) * | 2020-12-02 | 2022-09-16 | 西安建筑科技大学 | Device and method for testing bending creep strain of concrete continuous beam bridge under lever holding load |
| CN112858040A (en) * | 2021-02-25 | 2021-05-28 | 西南交通大学 | Concrete beam multipoint bending test device |
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