Device for testing shear strength of prefabricated bridge member node

Abstract

The utility model relates to the technical field of shear test equipment, and discloses a prefabricated bridge member node shear strength test device, which comprises a test frame body, a middle fixed pressure plate is fixedly arranged between the middle parts of opposite side walls in the test frame body, and an upper movable pressure plate and a lower movable pressure plate are respectively arranged above and below the middle fixed pressure plate. The upper end of the test rack body is provided with a hydraulic telescopic device, and the telescopic end of the hydraulic telescopic device can drive the upper movable pressing plate and the lower movable pressing plate to move towards or away from each other when stretching out and drawing back. According to the utility model, two groups of rubber supports needing to be subjected to a shear test are respectively placed on the upper surface of the middle fixed pressure plate and the upper surface of the lower movable pressure plate, the hydraulic telescopic device is started, and the telescopic end of the hydraulic telescopic device moves to drive the lower movable pressure plate and the upper movable pressure plate to move oppositely; and the telescopic end of the hydraulic telescopic device works back and forth once to complete multiple shear tests, so that the efficiency of the shear tests is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of shear test equipment, in particular to a shear strength test device for prefabricated assembled bridge component nodes. Background Art

[0002] When assembling prefabricated and assembled bridges, rubber bearings need to be installed at their connection nodes. Rubber bearings are a commonly used type of bearing in bridge engineering. They are located between the bridge and the pad stone. As an important structural component connecting the superstructure and substructure of the bridge, in order to ensure the mechanical performance of the rubber bearings, the rubber bearings need to be subjected to shear tests, and thus a shear strength test device needs to be used.

[0003] To improve the efficiency of shear testing of rubber bearings, prior art has made numerous improvements to bridge component node shear strength testing equipment. For example, patent publication number CN220104665U discloses an auxiliary tool for testing the shear elastic modulus of rubber bearings. The tool comprises a support plate with positioning blocks disposed on the support plate. The positioning blocks span opposite sides of the support plate, and the sidewalls of the positioning blocks abut against the sidewalls of the rubber bearings. Once the rubber bearings on either side of the support plate abut against the positioning blocks, their relative positions can be determined with greater precision, eliminating the need for manual visual inspection or manipulation, thereby improving operational efficiency and accuracy.

[0004] The above patents have obvious beneficial effects, but still have the following deficiencies in actual operation:

[0005] In the above-mentioned comparative document, a load-bearing plate is placed between two rubber bearings, and the two rubber bearings are placed between a pressure block and a placement table, and the shear strength of the rubber bearings is tested by pressing down the pressure block. However, in actual operation, the rubber bearings need to be subjected to a shear test after production before leaving the factory. Since a large number of rubber bearings need to be tested, the pressure block in the above-mentioned comparative document can only test one rubber bearing at a time when it moves up and down, thereby reducing the efficiency of the shear strength test of the rubber bearings. Therefore, there is an urgent need in this field to improve the shear strength test device for prefabricated and assembled bridge component nodes to solve the defects of the existing technology. Utility Model Content

[0006] In response to the deficiencies in the prior art, the utility model provides a prefabricated and assembled bridge component node shear strength testing device. The telescopic end of the hydraulic telescopic device works back and forth to complete multiple shear tests in one go, thereby improving the efficiency of the shear test.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a prefabricated and assembled bridge component node shear strength test device, comprising a test frame, wherein an intermediate fixed pressure plate is fixedly installed between the middle parts of the opposite side walls of the test frame, an upper dynamic pressure plate and a lower dynamic pressure plate are respectively provided above and below the intermediate fixed pressure plate, and a hydraulic telescopic device is provided at the upper end of the test frame, and the telescopic end of the hydraulic telescopic device can drive the upper dynamic pressure plate and the lower dynamic pressure plate to move toward or away from each other when telescopic.

[0008] Preferably, a lower fixed pressure plate and an upper fixed pressure plate are fixedly installed on the bottom and top of the test frame body respectively.

[0009] Preferably, the opposite side walls of the test frame body are slidably connected with a symmetrical first movable rack plate and a second movable rack plate, and the first movable rack plate and the second movable rack plate are respectively fixedly installed on the side surfaces of the upper movable pressure plate and the lower movable pressure plate, and the opposite side walls of the test frame body are rotatably connected with a gear located between the first movable rack plate and the second movable rack plate, and the gear is meshed with the first movable rack plate and the second movable rack plate, and the upper ends of the two second movable rack plates are fixedly connected to the first connecting plate, and the second connecting plate is fixedly connected between the upper ends of the two first connecting plates, and the telescopic end of the hydraulic telescopic device is fixedly installed on the lower side surface of the second connecting plate.

[0010] Preferably, opposite side walls inside the test frame are provided with mounting grooves adapted to the first movable rack plate and the second movable rack plate, and the first movable rack plate and the second movable rack plate are both slidably connected in the mounting grooves.

[0011] Preferably, the lower dynamic pressure plate, the middle fixed pressure plate, the upper dynamic pressure plate and the lower surface of the upper fixed pressure plate are all provided with positioning rings, the cross-section of the positioning rings is wedge-shaped, and the upper surfaces of the lower fixed pressure plate, the lower dynamic pressure plate, the middle fixed pressure plate and the upper dynamic pressure plate are all provided with positioning grooves adapted to the positioning rings.

[0012] Preferably, the rear sides of the first movable rack plate and the second movable rack plate are fixedly connected to limit slide bars, and the opposite side walls in the installation groove are provided with limit slide grooves adapted to the limit slide bars.

[0013] Preferably, the side surfaces of the first movable rack plate and the second movable rack plate are both fixedly connected with mounting clamps.

[0014] In view of the shortcomings of the existing technology, the present invention provides a prefabricated bridge component node shear strength test device, which overcomes the shortcomings of the existing technology. The beneficial effects of the present invention are:

[0015] 1. In the present invention, two groups of rubber bearings that need to be subjected to shear tests are respectively placed on the upper surface of the middle fixed pressure plate and the upper surface of the lower dynamic pressure plate. Each group of tests consists of two rubber bearings and a horizontal shear plate located between the two rubber bearings. After the positions of the rubber bearings are aligned, the hydraulic telescopic device is started, and the telescopic end of the hydraulic telescopic device moves, driving the lower dynamic pressure plate and the upper dynamic pressure plate to move toward each other, thereby performing a shear test on the rubber bearings located on the lower dynamic pressure plate and the middle fixed pressure plate. The telescopic end of the hydraulic telescopic device works back and forth once to complete multiple shear tests, thereby improving the efficiency of the shear test.

[0016] 2. In the present invention, when the shear test is completed, do not reverse the hydraulic telescopic device at this time. Place the rubber support that still needs to be tested for shear resistance on the upper surface of the lower fixed pressure plate and the upper dynamic pressure plate, and then start the telescopic end of the hydraulic telescopic device to move in the opposite direction. At this time, the upper dynamic pressure plate and the lower dynamic pressure plate move away from each other, and cooperate with the lower fixed pressure plate and the upper fixed pressure plate to perform the shear test of the rubber support again, increasing the number of times the telescopic end of the hydraulic telescopic device works back and forth to complete the shear test, thereby improving the efficiency of the shear test.

[0017] 3. In the present invention, when there is a slight deviation between the two rubber supports located above and below the horizontal shear plate, the positioning ring can be squeezed by the inclined surface to align them with the rubber supports located in the positioning groove, thereby facilitating axial alignment of the two rubber supports.

[0018] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures indicated in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0020] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic structural diagram of the positioning ring in the present utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the positioning groove in the utility model;

[0023] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle.

[0024] In the figure: 1. Test frame; 2. Middle fixed pressure plate; 3. Lower dynamic pressure plate; 4. Upper dynamic pressure plate; 5. Hydraulic telescopic device; 6. Lower fixed pressure plate; 7. Upper fixed pressure plate; 8. First movable rack plate; 9. Second movable rack plate; 10. Gear; 11. First connecting plate; 12. Second connecting plate; 13. Mounting groove; 14. Positioning ring; 15. Positioning groove; 16. Limiting slide; 17. Limiting slide groove; 18. Mounting splint. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] Example 1

[0027] See also Figure 1-Figure 4 A prefabricated and assembled bridge component node shear strength test device includes a test frame 1, an intermediate fixed pressure plate 2 is fixedly installed between the middle parts of the opposite side walls in the test frame 1, an upper dynamic pressure plate 4 and a lower dynamic pressure plate 3 are respectively provided above and below the intermediate fixed pressure plate 2, a hydraulic telescopic device 5 is provided at the upper end of the test frame 1, and the telescopic end of the hydraulic telescopic device 5 can drive the upper dynamic pressure plate 4 and the lower dynamic pressure plate 3 to move toward or away from each other when telescoping, a lower fixed pressure plate 6 and an upper fixed pressure plate 7 are fixedly installed at the bottom and top of the test frame 1, and the opposite side walls in the test frame 1 are slidably connected with a symmetrical first movable rack plate 8 and a second movable rack plate 9. Two movable rack plates 9, the first movable rack plate 8 and the second movable rack plate 9 are respectively fixedly installed on the side surfaces of the upper dynamic pressure plate 4 and the lower dynamic pressure plate 3, and the opposite side walls in the test frame 1 are rotatably connected with a gear 10 located between the first movable rack plate 8 and the second movable rack plate 9. The gear 10 is engaged with the first movable rack plate 8 and the second movable rack plate 9. The upper ends of the two second movable rack plates 9 are fixedly connected with a first connecting plate 11, and a second connecting plate 12 is fixedly connected between the upper ends of the two first connecting plates 11. The telescopic end of the hydraulic telescopic device 5 is fixedly installed on the lower side of the second connecting plate 12.

[0028] The specific implementation method of this embodiment: When assembling a prefabricated assembled bridge, it is necessary to install rubber bearings at the connection node positions. Rubber bearings are a commonly used bearing form in bridge engineering. They are located between the bridge and the pad stone. As an important structural component connecting the upper structure and the lower structure of the bridge, in order to ensure the mechanical performance of the rubber bearings, it is necessary to conduct a shear test on the rubber bearings, and then a shear strength test device is needed. In this embodiment, when the rubber bearings need to be subjected to a shear test, the two groups of rubber bearings that need to be subjected to the shear test are respectively placed on the upper surface of the middle fixed pressure plate 2 and the upper surface of the lower dynamic pressure plate 3. Each group of tests consists of two rubber bearings and a horizontal shear plate located between the two rubber bearings. After the positions of the rubber bearings are aligned, the hydraulic telescopic device 5 is started, and the telescopic end of the hydraulic telescopic device 5 moves, thereby driving the second connecting plate 12 to move, and the first connecting plate 11 drives the second connecting plate 12 to move. When the gear 10 rotates, it drives the first movable rack plate 8 to move. The first movable rack plate 8 and the second movable rack plate 9 respectively drive the lower movable pressure plate 3 and the upper movable pressure plate 4 to move toward each other, thereby performing a shear test on the rubber bearings on the lower movable pressure plate 3 and the middle fixed pressure plate 2. When the shear test is completed, do not reverse the hydraulic telescopic device 5 at this time. Place the rubber bearings that still need to be tested for shear resistance on the upper surfaces of the lower fixed pressure plate 6 and the upper movable pressure plate 4, and then start the telescopic end of the hydraulic telescopic device 5 to move in the opposite direction. At this time, the upper movable pressure plate 4 and the lower movable pressure plate 3 move away from each other, and cooperate with the lower fixed pressure plate 6 and the upper fixed pressure plate 7 to perform the shear test of the rubber bearing again. The telescopic end of the hydraulic telescopic device 5 works back and forth once to complete multiple shear tests, thereby improving the efficiency of the shear test.

[0029] Among them, the hydraulic telescopic device 5 mentioned above can be purchased on the market. It is a mature technology and has been fully disclosed, so it is not repeated in the specification. The hydraulic telescopic device 5 is equipped with a hydraulic pipeline, and it is connected to the external hydraulic station through the hydraulic pipeline. The hydraulic station is electrically connected to the main controller, and the main controller can be a conventional known device such as a computer that plays a control role.

[0030] Example 2

[0031] See also Figure 1-Figure 4 This embodiment includes the above embodiment, which further includes: the opposite side walls in the test frame 1 are provided with mounting grooves 13 adapted to the first movable rack plate 8 and the second movable rack plate 9, the first movable rack plate 8 and the second movable rack plate 9 are both slidably connected in the mounting grooves 13, the back sides of the first movable rack plate 8 and the second movable rack plate 9 are fixedly connected to the limiting slide 16, and the opposite side walls in the mounting grooves 13 are provided with limiting slide grooves 17 adapted to the limiting slide 16.

[0032] The specific implementation method of this embodiment is as follows: the first movable rack plate 8 and the second movable rack plate 9 are located in the installation groove 13, and the limiting slide 16 slides in the limiting slide groove 17 to limit the first movable rack plate 8 and the second movable rack plate 9 when moving, thereby improving the stability of the first movable rack plate 8 and the second movable rack plate 9 when moving, and the installation groove 13 runs through the upper and lower parts of the test frame 1, so that the first movable rack plate 8 and the second movable rack plate 9 can be taken out and installed.

[0033] Implementation Three

[0034] See also Figure 2 、 Figure 3 and Figure 4 This embodiment includes all the above embodiments, which further includes: the lower surfaces of the lower dynamic pressure plate 3, the intermediate fixed pressure plate 2, the upper dynamic pressure plate 4 and the upper fixed pressure plate 7 are all provided with positioning rings 14, the cross-section of the positioning ring 14 is wedge-shaped, the upper surfaces of the lower fixed pressure plate 6, the lower dynamic pressure plate 3, the intermediate fixed pressure plate 2 and the upper dynamic pressure plate 4 are all provided with positioning grooves 15 adapted to the positioning rings 14, and the sides of the first movable rack plate 8 and the second movable rack plate 9 are fixedly connected with mounting clamps 18.

[0035] The specific implementation method in this embodiment is as follows: the cavity inside the positioning ring 14 is narrow at the top and wide at the bottom, and the cavity inside the positioning groove 15 is wide at the top and narrow at the bottom. When there is a slight deviation between the two rubber supports located above and below the horizontal shear plate, the positioning ring 14 is squeezed on the inclined surface to align it with the rubber support located in the positioning groove 15, which facilitates axial alignment of the two rubber supports. The lower dynamic pressure plate 3 and the upper dynamic pressure plate 4 are installed by fastening bolts and cooperating with the mounting clamp 18, which makes it easy to replace them later.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A prefabricated bridge component node shear strength test device, comprising a test frame (1), characterized in that: An intermediate fixed pressure plate (2) is fixedly installed between the middle parts of the opposite side walls in the test frame (1), and an upper dynamic pressure plate (4) and a lower dynamic pressure plate (3) are respectively provided above and below the intermediate fixed pressure plate (2). A hydraulic telescopic device (5) is provided at the upper end of the test frame (1), and the telescopic end of the hydraulic telescopic device (5) can drive the upper dynamic pressure plate (4) and the lower dynamic pressure plate (3) to move toward or away from each other when telescoping.

2. A prefabricated bridge component node shear strength test device according to claim 1, characterized in that: A lower fixed pressure plate (6) and an upper fixed pressure plate (7) are fixedly mounted on the bottom and top of the test frame (1), respectively.

3. A prefabricated bridge component node shear strength test device according to claim 1, characterized in that: The opposite side walls in the test frame (1) are slidably connected to a symmetrical first movable rack plate (8) and a second movable rack plate (9), and the first movable rack plate (8) and the second movable rack plate (9) are fixedly installed on the side surfaces of the upper dynamic pressure plate (4) and the lower dynamic pressure plate (3), respectively. The opposite side walls in the test frame (1) are rotatably connected to a gear (10) located between the first movable rack plate (8) and the second movable rack plate (9), and the gear (10) is meshed with the first movable rack plate (8) and the second movable rack plate (9). The upper ends of the two second movable rack plates (9) are fixedly connected to a first connecting plate (11), and a second connecting plate (12) is fixedly connected between the upper ends of the two first connecting plates (11). The telescopic end of the hydraulic telescopic device (5) is fixedly installed on the lower side surface of the second connecting plate (12).

4. A prefabricated bridge component node shear strength test device according to claim 2, characterized in that: The opposite side walls of the test frame (1) are provided with mounting grooves (13) adapted to the first movable rack plate (8) and the second movable rack plate (9), and the first movable rack plate (8) and the second movable rack plate (9) are both slidably connected in the mounting grooves (13).

5. The shear strength test device for prefabricated and assembled bridge component nodes according to claim 2, characterized in that: The lower surfaces of the lower dynamic pressure plate (3), the intermediate fixed pressure plate (2), the upper dynamic pressure plate (4) and the upper fixed pressure plate (7) are all provided with positioning rings (14), the cross section of the positioning rings (14) is wedge-shaped, and the upper surfaces of the lower fixed pressure plate (6), the lower dynamic pressure plate (3), the intermediate fixed pressure plate (2) and the upper dynamic pressure plate (4) are all provided with positioning grooves (15) adapted to the positioning rings (14).

6. A prefabricated bridge component node shear strength test device according to claim 4, characterized in that: The first movable rack plate (8) and the second movable rack plate (9) are fixedly connected to the limiting slide bar (16) on their opposite sides, and the opposite side walls in the installation groove (13) are provided with limiting slide grooves (17) adapted to the limiting slide bar (16).

7. A prefabricated bridge component node shear strength test device according to claim 3, characterized in that: The sides of the first movable rack plate (8) and the second movable rack plate (9) are both fixedly connected with mounting clamping plates (18).

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