CN118190794A - Test device for bonding performance of concrete and steel structure - Google Patents

Abstract

The invention provides a test device for bonding performance of concrete and a steel structure, which belongs to the technical field of material testing, and comprises the following components: the testing machine body is provided with a clamping platform, and the outer edge of the clamping platform forms a gear ring turntable; a drawing assembly for drawing the steel structure; the clamping assemblies comprise a sliding cylinder, clamping jaws are connected in the sliding cylinder in a sliding manner through elastic assemblies, and racks are arranged on the side surfaces of the clamping jaws; the transmission assemblies comprise transmission shafts and transmission gears which are matched with each other, and the transmission gears are matched with the racks; the driving assembly comprises a gear ring, a rotating assembly for driving the gear ring to rotate and a lifting assembly for driving the gear ring to lift, wherein the gear ring is sleeved on the gear ring turntable. The invention can synchronously clamp the test pieces with different sizes in different directions, so that the stress of the test pieces in all directions is uniform, and the test accuracy is improved.

Description

A test device for bonding performance of concrete and steel structure

Technical Field

The invention belongs to the technical field of material testing, and in particular relates to a testing device for bonding performance of concrete and steel structure.

Background technique

Steel structure concrete is formed by the combination of concrete and steel structure. As we all know, concrete has high compressive strength but weak bending resistance, while steel structure has strong bending resistance and good elastic plasticity, but it is easy to become unstable and lose axial compressive resistance when under pressure; steel structure concrete can combine the advantages of both in structure. The restraint effect of steel structure on the concrete inside it improves the compressive strength of concrete. At the same time, due to the presence of concrete, it effectively prevents local buckling of steel structure and improves the rigidity of steel structure. The two work together to greatly improve the bearing capacity. As an emerging composite structure, steel structure concrete is mainly composed of axially compressed and compressive members with small eccentric force, and is widely used in frame structures. The main reason why they can work together is that there is an effective bonding effect between the two. This bonding effect enables stress transfer between steel structure and concrete at the interface, thereby establishing the working stress necessary for structural bearing.

When testing the bonding stress between concrete and steel structure, the test piece needs to be clamped and fixed. However, in the existing technical solutions, such as the reinforced concrete interface bonding stress testing device disclosed in the patent with patent number CN 115629040A, its specification states: When the device is used, the existing tensile tester is provided with a housing, a control unit, an assembly table, a storage bin device, a clamping device, a tensile tester, and a converter mechanism, which avoids the problems of limited fixing methods for the test piece, inability to effectively clamp test pieces of different widths, and low flexibility. The device can adapt to clamping the side of the test piece through the provided clamping sleeve device, which is suitable for test pieces of different widths and has higher flexibility. At the same time, the top plate is provided to penetrate the opening groove, and then form a locking fit with the side slide rail, which can form a fit with the test piece in multiple directions.

The above solution, when actually used, cannot clamp the test piece synchronously in all directions, which will cause inconsistent force on the test piece, and in severe cases, the test piece will be displaced, affecting the centering clamping of the top clamping head and the pulling column inside the test piece, resulting in test errors.

Summary of the invention

In order to solve one of the problems existing in the above-mentioned prior art, the present invention proposes a test device for the bonding performance of concrete and steel structure. The present invention can synchronously clamp test pieces of different sizes in different directions, so that the test pieces are subjected to uniform force in all directions, thereby improving the test accuracy.

The technical solution adopted by the present invention to solve the technical problem is:

The technical scheme proposes a test device for the bonding performance of concrete and steel structure, comprising: a test machine body, the test machine body having a clamping platform, the outer edge of the clamping platform forming a gear ring turntable; a pulling component for pulling the steel structure; a plurality of groups of clamping components, the clamping component comprising a sliding cylinder, a clamping claw slidably connected to the sliding cylinder through an elastic component, and a rack is arranged on the side of the clamping claw; a plurality of groups of transmission components, the transmission components comprising matching transmission shafts and transmission gears, and the transmission gears are matched with the racks; a driving component, the driving component comprising a gear ring, the gear ring is sleeved on the gear ring turntable, and also comprises a rotating component for driving the gear ring to rotate and a lifting component for driving the gear ring to rise and fall; when the lifting component drives the gear ring to rise, the gear ring is meshed with the transmission gear of each group of the transmission components, and the gear ring is disengaged from the transmission gear after descending.

Preferably, the transmission gear includes a first gear and a second gear, the first gear is sleeved on the upper end of the transmission shaft and meshes with the rack, the second gear is sleeved on the lower end of the transmission shaft and matches with the ring gear.

Preferably, the rotating assembly includes a long gear meshing with the ring gear, and the long gear is connected to a driving motor.

Preferably, the lifting assembly includes a turntable groove opened below the gear ring turntable, a gear ring protrusion is provided below the gear ring, the gear ring protrusion cooperates with the turntable groove, and the turntable groove has an inclined surface, when the gear ring rotates, the gear ring protrusion slides along the inclined surface of the turntable groove, thereby driving the gear ring to rise and fall.

Preferably, it also includes a limit assembly, which includes a protrusion fixedly set on the clamping jaw, and also includes a limit plate, the middle part of the limit plate is also rotatably connected to a rotating shaft, and the rotating shaft is fixedly connected to the sliding cylinder; the upper end of the limit plate corresponds to the protrusion, and the lower part of the limit plate corresponds to the gear ring; in normal state, the upper end of the limit plate contacts the protrusion, so that the clamping jaw is in a retracted state, and when the gear ring rises the first stroke, the gear ring drives the limit plate to rotate around the rotating shaft, the upper end of the limit plate is separated from the protrusion, and the clamping jaw extends outward under the action of the elastic assembly.

Preferably, the elastic component is a compression spring.

Preferably, the pulling assembly includes a plurality of guide columns and a plurality of hydraulic cylinders fixed on the clamping platform, the top of the hydraulic cylinder is fixedly connected with a lifting platform, the lifting platform is slidably connected with the guide columns, and a clamping head is arranged at the bottom of the lifting platform.

Compared with the prior art, the present invention has the following beneficial effects:

1. By setting an elastic component at the tail of the clamp, the clamps in multiple directions can be extended separately, and then reach the surface of the test piece for pre-clamping. Then the driving component drives the transmission component, so that the transmission component drives the clamps in all directions to apply clamping force evenly at the same time, avoiding deflection caused by unbalanced force during the clamping process of the workpiece.

2. In order to cooperate with the pre-clamping function, the gear ring can be raised and lowered. During the first stroke of the gear ring rising, the limit assembly will release the clamping jaws for pre-clamping. Then, after the gear ring continues to rise, it will engage with the transmission assembly, thereby driving the clamping jaws to clamp, thus avoiding the situation where the gear ring starts to drive the transmission assembly to clamp before the clamping jaws are in place.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 is a perspective view of the overall structure of the present invention;

Fig. 2 is a front schematic diagram of the overall structure of the present invention;

Fig. 3 is a cross-sectional view of the A-A section in Fig. 2;

FIG4 is a schematic diagram of a partial structure of the clamping assembly in FIG1 ;

FIG5 is a schematic diagram of a partial structure of the clamping assembly in FIG1 (working state 1);

FIG6 is a schematic diagram of the structure of the clamping assembly in FIG1 (working state 2);

FIG. 7 is a schematic structural diagram of the test piece in FIG. 1 .

Description of reference numerals:

1. Guide column; 2. Lifting platform; 3. Clamping head; 4. Hydraulic cylinder; 5. Pulling column; 6. Test piece; 7. Clamping assembly; 8. Transmission assembly; 9. Operating table; 10. Test machine body; 11. Clamping platform; 12. Gear ring; 13. Long gear; 14. Motor;

61, concrete; 71, clamping claw; 72, rack; 73, sliding cylinder; 74, protrusion; 75, limit plate; 76, rotating shaft; 77, lifting shaft; 78, elastic component;

81. first gear; 82. transmission shaft; 83. second gear; 84. first chamfer;

111, turntable groove; 121, gear ring protrusion; 122, second chamfer.

Detailed ways

In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In the description of the present invention, it is to be understood that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally disposed component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally disposed component.

In addition, terms such as "long", "short", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device or component referred to must have this specific direction or operate with a specific direction structure, and should not be understood as a limitation of the present invention.

As shown in Figures 1 to 6, this embodiment proposes a test device for the bonding performance of concrete and steel structure, including a test machine body 10, on which a measuring instrument for testing is mounted; an operating table 9 is provided on one side of the test machine body 10; the test machine body 10 has a hydraulic power device for driving a hydraulic cylinder 4 to drive a lifting platform 2 to lift; in order to test a test piece 6, the inside of the test piece 6 is filled with concrete 61, and a pulling column 5 is provided in the concrete 61 for facilitating testing.

A plurality of clamping assemblies 7 are provided on the testing machine body 10, and the clamping assemblies 7 include a sliding cylinder 73, and an elastic assembly 78 is provided between the sliding cylinder 73 and the clamping jaws 71. For example, the elastic assembly 78 can adopt a compression spring, and the elastic assembly 78 can push the clamping jaws 71 to extend, thereby realizing the independent extension of each group of clamping jaws 71, so that the clamping jaws 71 in all directions can contact the surface of the test piece 6 to realize pre-clamping.

The limiting assembly includes a protrusion 74 arranged on the clamping jaw 71, and also includes a "V"-shaped limiting plate 75, a rotating shaft 76 is arranged in the middle of the limiting plate 75, and the rotating shaft 76 is arranged on the sliding cylinder 73; the upper end of the limiting plate 75 corresponds to the protrusion 74, and the lower part of the limiting plate 75 is provided with a lifting shaft 77 and corresponds to the gear ring 12; in normal state, the upper end of the limiting plate 75 contacts the protrusion 74, so that the clamping jaw 71 is in a retracted state. In addition, a rack 72 is fixed to the side of the clamping jaw 71, and the rack 72 is meshed with a transmission assembly 8, and the transmission assembly 8 includes a first gear 81, a second gear 83 and a transmission shaft 82, and the transmission shaft 82 is rotatably connected to the clamping platform 11, the first gear 81 is sleeved on the upper end of the transmission shaft 82, and the first gear 81 is meshed with the rack 72, and the second gear 83 is sleeved on the lower part of the transmission shaft 82 and matches with the gear ring 12.

The rotating assembly includes a long gear 13 meshing with the ring gear 12 . The long gear 13 is connected to a motor 14 for driving. The motor 14 drives the long gear 13 to rotate, thereby driving the ring gear 12 to rotate.

The lifting assembly includes a turntable groove 111 arranged below the gear ring turntable, and a gear ring protrusion 121 is arranged below the gear ring 12. The gear ring protrusion 121 cooperates with the turntable groove 111, and the turntable groove 111 has an inclined surface. When the gear ring 12 rotates, the gear ring protrusion 121 slides along the inclined surface of the turntable groove 111, thereby driving the gear ring 12 to rise and fall. When the gear ring 12 rises in the first stroke, the gear ring 12 drives the limit plate 75 to rotate around the rotating shaft 76 through the lifting shaft 77. Of course, the lifting shaft 77 can also be manually driven to separate the upper end of the limit plate 75 from the protrusion 74, and the clamping claw 71 extends outward under the action of the elastic component 78; the gear ring 12 continues to rise and begins to mesh with the second gear 83, so it will drive the transmission shaft 82 and the first gear 81 to rotate through the second gear 83, and then drive the clamping claw 71 to clamp the test piece 6. The time taken by the gear ring 12 to rise in the first stroke is longer than the time taken by the clamping jaws 71 to extend. Therefore, after the gear ring 12 has risen in the first stroke, it can be ensured that the clamping jaws 71 have completed pre-clamping.

The second gear 83 has a first chamfer 84 at its lower end, and the gear ring 12 has a second chamfer 122 at its upper end. The first chamfer 84 and the second chamfer 122 cooperate to avoid tooth play when the gear ring 12 rises and meshes with the second gear 83 .

The clamping platform 11 is fixed with a plurality of guide columns 1, and a lifting platform 2 is slidably connected to the guide columns 1. The clamping platform 11 is also fixed with a plurality of hydraulic cylinders 4, and the top of the hydraulic cylinder 4 is fixedly connected to the lifting platform 2, which can drive the lifting platform 2 to slide up and down along the guide columns 1.

After the hydraulic cylinder 4 drives the lifting platform 2 to descend to a certain position, it first controls the clamping head 3 to clamp the pulling column 5. Then, after the clamping assembly 7 clamps the test piece 6, the hydraulic cylinder 4 lifts the lifting platform 2 upward to perform the pulling test.

working principle:

S1: When in use, place the test piece 6 provided with the drawing column 5 on the upper part of the clamping platform 11, then align the axis of the drawing column 5 with the center of the clamping head 3, operate on the operating table 9, start the hydraulic cylinder 4, so that the hydraulic cylinder 4 drives the lifting platform 2 to descend, and after the clamping head 3 contacts the drawing column 5, control the clamping head 3 to clamp the drawing column 5;

S2: After the clamping head 3 clamps the drawing column 5, the motor 14 is started on the operating table 9, so that the motor 14 drives the long gear 13 to rotate, and the long gear 13 drives the ring gear 12 to rotate. As the ring gear 12 rotates, the ring gear protrusion 121 gradually slides out of the turntable groove 111, and the ring gear 12 rises while rotating;

S3: The gear ring 12 rises to the first stroke, and lifts the lifting shaft 77 upward, and the lifting shaft 77 drives the limit plate 75 to rotate around the rotation shaft 76. After the limit plate 75 rotates, the protrusion 74 is no longer blocked by the limit plate 75, and the elastic component 78 pushes the clamping claw 71 to extend from the sliding cylinder 73, and the clamping claw 71 contacts the surface of the test piece 6, completing the pre-clamping;

S4: The gear ring 12 continues to rise, and the gear ring 12 meshes with the second gear 83. The gear ring 12 drives the second gear 83 to rotate, and the second gear 83 drives the first gear 81 to rotate. The first gear 81 meshes and drives the rack 72, so that the clamp 71 begins to apply clamping force to the test piece 6. After the pressure sensor built into the clamp 71 reaches the set value, the motor 14 is locked; the hydraulic cylinder 4 starts to drive the lifting platform 2 to rise and perform a pulling test.

In S1, the outer ring of the test piece 6 is a steel structure, and the interior is filled with concrete 61. A pulling column 5 is pre-embedded in the concrete 61. The bottom of the pulling column 5 is a flat plate structure, which can increase the bonding degree between the pulling column 5 and the concrete 61 and avoid the pulling column 5 and the concrete 61 from separating during the pulling test.

In S2, a turntable groove 111 is provided under the gear ring turntable, and the turntable groove 111 has an inclined surface, and a gear ring protrusion 121 is provided under the gear ring 12, and the gear ring protrusion 121 cooperates with the turntable groove 111. When the gear ring 12 is driven to rotate by the long gear 13, the gear ring protrusion 121 slides along the inclined surface of the turntable groove 111, thereby driving the gear ring 12 to rise and fall.

In S3 , the first stroke is from the start of the rise of the ring gear 12 to the contact with the second gear 83 .

In S3-S4, the time required for the jaws 71 in different directions to be released and contact with the sides of the test piece 6 varies according to the size of the test piece 6, and the longest time is 2 seconds. The first stroke time is fixed at 3 seconds, so that the gear ring 12 can start to mesh with the second gear 83 only after the jaws 71 are in place for test pieces 6 of different sizes.

According to the above use process, the test piece is first placed on the clamping platform 11, and the pulling column 5 is aligned with the clamping head 3. During the clamping process, the clamping jaws 71 in each direction are first released to make them contact with the side of the test piece 6, and then the gear ring 12 is meshed with the second gear 83. That is to say, at the beginning of clamping, the clamping jaws 71 are in contact with the corresponding plane of the test piece 6, and during the clamping process, each clamping jaw 71 simultaneously applies a clamping force to the test piece 6. Therefore, the clamping process of each clamping jaw 71 does not cause the test piece 6 to be displaced, thereby ensuring that the pulling column 5 of the test piece 6 is always aligned with the clamping head 3.

The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly/indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims (7)

1. A testing device for bonding performance of concrete and steel structure, characterized in that it comprises: a testing machine body (10), the testing machine body (10) having a clamping platform (11), the outer edge of the clamping platform (11) forming a gear ring turntable; a pulling assembly for pulling the steel structure; a plurality of groups of clamping assemblies (7), the clamping assemblies (7) comprising a sliding cylinder (73), a clamping claw (71) slidably connected to the sliding cylinder (73) via an elastic assembly (78), and a rack (72) is arranged on the side of the clamping claw (71); a plurality of groups of transmission assemblies (8) The transmission assembly (8) includes a matching transmission shaft (82) and a transmission gear, and the transmission gear cooperates with the rack (72); a driving assembly, the driving assembly includes a ring gear (12), the ring gear (12) is sleeved on the ring gear turntable, and also includes a rotating assembly for driving the ring gear (12) to rotate and a lifting assembly for driving the ring gear (12) to rise; when the lifting assembly drives the ring gear (12) to rise, the ring gear (12) meshes with the transmission gear of each group of the transmission assemblies (8), and the ring gear (12) is disengaged from the transmission gear after it descends. 2. The test device for bonding performance between concrete and steel structure according to claim 1, characterized in that: the transmission gear comprises a first gear (81) and a second gear (83), the first gear (81) is sleeved on the upper end of the transmission shaft (82), and the first gear (81) is meshed with the rack (72), the second gear (83) is sleeved on the lower end of the transmission shaft (82), and the second gear (83) is matched with the ring gear (12). 3. The test device for bonding performance between concrete and steel structure according to claim 1, characterized in that: the rotating assembly comprises a long gear (13) meshing with the ring gear (12), and the long gear (13) is connected to a driving motor. 4. The test device for bonding performance of concrete and steel structure according to claim 1 is characterized in that: the lifting assembly includes a turntable groove (111) opened below the gear ring turntable, a gear ring protrusion (121) is provided below the gear ring (12), the gear ring protrusion (121) cooperates with the turntable groove (111), and the turntable groove (111) has an inclined surface, when the gear ring (12) rotates, the gear ring protrusion (121) slides along the inclined surface of the turntable groove (111), thereby driving the gear ring (12) to rise and fall. 5. The test device for bonding performance of concrete and steel structure according to claim 1, characterized in that: it also includes a limit assembly, the limit assembly includes a protrusion (74) fixedly arranged on the clamping jaw (71), and also includes a limit plate (75), the middle part of the limit plate (75) is also rotatably connected with a rotating shaft (76), and the rotating shaft (76) is fixedly connected to the sliding cylinder (73); the upper end of the limit plate (75) corresponds to the protrusion (74), and the lower part of the limit plate (75) corresponds to the gear ring (12); in normal state, the upper end of the limit plate (75) contacts the protrusion (74), so that the clamping jaw (71) is in a retracted state, when the gear ring (12) rises to a first stroke, the gear ring (12) drives the limit plate (75) to rotate around the rotating shaft (76), the upper end of the limit plate (75) is separated from the protrusion (74), and the clamping jaw (71) extends outward under the action of the elastic component (78). 6. The testing device for bonding performance between concrete and steel structure according to claim 1, characterized in that the elastic component (78) is a compression spring. 7. The test device for the bonding performance of concrete and steel structure according to claim 1 is characterized in that: the pulling assembly comprises a plurality of guide columns (1) and a plurality of hydraulic cylinders (4) fixed on the clamping platform (11), the top of the hydraulic cylinder (4) is fixedly connected to a lifting platform (2), the lifting platform (2) is slidably connected to the guide columns (1), and a clamping head (3) is arranged at the bottom of the lifting platform (2).