Testing device for high-performance anti-crack sealing layer of infrastructure

Abstract

The utility model discloses a testing device for an infrastructure high-performance anti-crack sealing layer, which comprises a testing beam, a reinforcing mesh is arranged in the testing beam, a testing groove is arranged in the middle of the upper end of the testing beam, an anti-crack sealing layer is arranged at the top end of the testing beam, and part of the anti-crack sealing layer covers the testing groove. A test groove is formed in the test beam, detection liquid is arranged in the test groove, a pressure applying device is arranged above the test beam, the test groove is positioned between two pressure points of the pressure applying device, and a support frame is arranged below the test beam. Compared with the prior art, the device has the advantages that downward pressure is applied to the test beam through the pressure applying device, when the test beam at the test groove is cracked, whether water seepage occurs or not is observed, if not, the performance of the anti-crack sealing layer reaches the standard, and otherwise, the anti-crack sealing layer fails. The whole structure is simple, and the real stress of cracking of the anti-crack sealing layer of the bridge floor can be simulated. Secondly, whether the crack-resistant seal coat is damaged or not is judged by observing whether the test beam has a water seepage phenomenon or not, the operation is simple, and the judgment is clear.

Description

Technical Field

[0001] The utility model relates to the technical field of detection of anti-cracking seal coats for bridge decks, and particularly relates to a testing device for high-performance anti-cracking seal coats of infrastructure. Background Art

[0002] The anti-cracking seal coat for the bridge deck plays an important role in preventing rainwater from entering the bridge deck, protecting the bridge structure, extending the service life, improving safety and promoting environmental protection, and is an indispensable part of bridge protection and maintenance. The existing test for the performance of the anti-cracking seal coat is to perform axial repeated tension on a preset crack, and judge the performance of the waterproof coating by measuring the sizes of defects such as cracks and holes in the waterproof coating. The existing technology has the following problems: ① Because it is a preset crack, this test method cannot reflect the influence of the energy release at the moment of concrete structure cracking on the waterproof coating (the strain of the waterproof coating at the crack suddenly increases at the moment of concrete structure cracking, which may cause the waterproof coating to be instantly torn); ② The existing test scheme is to axially stretch the waterproof coating, which is different from the situation where the main structure of the bridge is bent and cracks cause reflection cracks on the driving surface. The existing test scheme cannot fully simulate the real cracking performance of the anti-cracking seal coat for the bridge deck. ③ The color of the waterproof coating is relatively deep, and it is invisible to the naked eye in the initial stage of cracking, making it difficult to judge the performance of the waterproof coating. Summary of the Utility Model

[0003] (1) Technical Problems to be Solved

[0004] Based on this, the utility model provides a testing device for high-performance anti-cracking seal coats of infrastructure to solve the problems that the existing anti-cracking seal coat performance test cannot truly reflect the influence of concrete structure cracking on the anti-cracking seal coat and it is difficult to judge the performance of the anti-cracking seal coat.

[0005] (2) Technical Solutions

[0006] The utility model provides a testing device for high-performance anti-cracking seal coats of infrastructure to overcome the above problems or at least partially solve the above problems. The testing device includes a test beam, a steel bar mesh is arranged in the test beam, a test groove is arranged at the middle position of the upper end of the test beam, an anti-cracking seal coat is arranged at the top end of the test beam, and part of the anti-cracking seal coat covers the test groove. A detection liquid is arranged in the test groove, a pressure applicator is arranged above the test beam, the test groove is located between two pressure points of the pressure applicator, and a support frame is arranged below the test beam.

[0007] Preferably, a displacement gauge is arranged at the bottom of the test beam.

[0008] Preferably, the steel bar mesh includes a plurality of connecting bars horizontally arranged in the test beam, and a plurality of connecting frames are fixed on the connecting bars.

[0009] Preferably, no connecting frame is distributed below the test groove.

[0010] Preferably, the groove wall of the test groove is inclined, and the aperture of the groove opening of the test groove is larger than the caliber of the groove bottom.

[0011] Preferably, the support frame includes a first support seat and a second support seat, and both the first support seat and the second support seat are located between two pressure points.

[0012] Preferably, the displacement gauges are distributed at both ends and the middle position of the test beam.

[0013] Preferably, the pressure applicator includes a cross beam, the pressure points are fixed at the bottom of the cross beam, a driving member is provided at the upper end of the cross beam, and the driving member is located between two pressure points.

[0014] Preferably, one of the pressure points is a fixed support, and the other pressure point is a sliding support.

[0015] Preferably, the sliding support includes a first base, rollers are provided on the first base, the rotating shafts on the rollers slide along the strip holes on the base, a top plate is provided above the rollers, fixing rods are provided at both ends of the top plate, and connecting members are sleeved between the fixing rods and the rotating shafts.

[0016] (III) Beneficial effects

[0017] In the present utility model, a downward pressure is applied to the test beam through a pressure applicator. When the test beam at the test groove cracks, it is observed whether there is water seepage. If not, it indicates that the performance of the crack-resistant seal layer meets the standard; otherwise, it indicates that the crack-resistant seal layer fails. The overall structure is simple, and it can simulate the real stress (bending crack) of the crack-resistant seal layer on the bridge deck and fully consider the influence of the crack-resistant seal layer before and after the crack occurs. Secondly, the cooperation of the test groove and the detection liquid facilitates determining whether the crack-resistant seal layer is damaged by observing whether there is water seepage in the test beam, and the operation is simple and the judgment is clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The features and advantages of the present utility model will be more clearly understood by referring to the accompanying drawings. The drawings are schematic and should not be construed as imposing any limitation on the present utility model. In the drawings:

[0019] Figure 1 is a schematic structural diagram of the present utility model;

[0020] Figure 2 is a schematic structural diagram of the test beam of the present utility model;

[0021] Figure 3 is a top view of the test beam of the present utility model;

[0022] Figure 4 is a schematic cross-sectional view of the test beam of the present utility model;

[0023] Figure 5 Internal structural schematic diagram of the test beam of the present utility model;

[0024] Figure 6 is Figure 5 Cross-sectional schematic diagram of;

[0025] Figure 7 Structural schematic diagram of the sliding support of the present utility model;

[0026] Figure 8 Structural schematic diagram of the fixed support of the present utility model;

[0027] Figure 9 Structural schematic diagram of the cracked test beam of the present utility model (water seepage occurs);

[0028] Figure 10 Structural schematic diagram of the cracked test beam of the present utility model (no water seepage).

[0029] Explanation of reference numerals:

[0030] 1. Test beam, 11. Test groove, 2. Steel mesh, 21. Connecting bar, 22. Connecting frame, 3. Crack-resistant sealant, 4. Presser, 41. Fixed support, 42. Sliding support, 43. Cross beam, 44. Driving member, 421. First base, 422. Roller, 423. Rotating shaft, 100. Strip hole, 424. Top plate, 425. Fixed rod, 426. Connecting member, 5. Support frame, 51. First support seat, 52. Second support seat, 6. Displacement gauge. Detailed implementation manners

[0031] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the following detailed description of the specific implementation manners of the present utility model will be given with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific implementations disclosed below.

[0032] Refer to the attached Figure 1-2, this embodiment provides a test device for a high-performance crack-resistant seal layer of infrastructure, including a test beam 1. A steel mesh 2 is arranged inside the test beam 1. The test beam 1 is formed by pouring concrete. A test groove 11 is arranged at the middle position of the upper end of the test beam 1. By setting the test groove 11 here, when pressure is applied to the test beam 1, the test beam 1 at the test groove 11 is prone to cracking. An anti-crack seal layer 3 is arranged at the top of the test beam 1, and a part of the anti-crack seal layer 3 covers the test groove 11. A detection liquid is arranged inside the test groove 11. A pressure applicator 4 is arranged above the test beam 1. The test groove 11 is located between two pressure points of the pressure applicator 4, and the two pressure points respectively press on one end of the test beam 1. A support frame 5 is arranged below the test beam 1. Specifically, the detection liquid can be water or other easily identifiable liquids. Since the anti-crack seal layer 3 is an organic material with good toughness, no through cracks that are convenient to observe will be generated after the anti-crack seal layer 3 is damaged. Coupled with the fact that the color of the anti-crack seal layer 3 is black, this further increases the difficulty of observing cracks. The utility model adopts the method of adding water to the test groove 11, and during the test process, it is determined whether the anti-crack seal layer 3 is damaged by observing whether there is water seepage in the test beam 1. The operation is simple and the judgment is clear.

[0033] During the test process, the pressure applicator 4 applies pressure to the test beam 1 through the pressure points. As the load continuously increases, the test beam 1 at the test groove 11 cracks. When the crack of the test beam 1 cracks to the allowable crack of the bridge design, reciprocating fatigue loading is carried out at this crack width, referring to the appendix Figure 9 , when it is observed that there is water seepage at the crack position of the test beam 1, it indicates that the anti-crack seal layer 3 fails.

[0034] As another embodiment of the utility model: A displacement gauge 6 is arranged at the bottom of the test beam 1, and the deformation of the test beam 1 is detected through the displacement gauge 6.

[0035] One embodiment of the steel mesh 2: Refer to the appendix Figure 5 and the appendix Figure 6 , the steel mesh 2 includes a plurality of connecting bars 21 horizontally arranged inside the test beam 1, and a plurality of connecting frames 12 are fixed on the connecting bars 21.

[0036] As another embodiment of the utility model: No connecting frames 12 are distributed below the test groove 11. This structural design can reduce the structural strength of the test beam 1 at the test groove 11 to ensure that the test beam 1 at this place cracks first when pressure is applied.

[0037] As another embodiment of the utility model: Refer to the appendix Figure 3 and the appendix Figure 4 , the groove wall of the test groove 11 is inclined to facilitate the application of the anti-crack seal layer 3, and the aperture of the groove opening of the test groove 11 is larger than the diameter of the groove bottom.

[0038] An implementation of the support frame 5: The support frame 5 includes a first support base 51 and a second support base 52, and both the first support base 51 and the second support base 52 are located between two pressure points. The test groove 11 is located in the pure bending section. Due to the existence of the groove opening, the moment of inertia of the cross-section at this position is smaller than that at other positions, which can ensure that the crack generation position is at the test groove 11.

[0039] As another implementation of the present utility model: The displacement gauges 6 are distributed at both ends and the middle position of the test beam 1. Specifically, the displacement gauges 6 are thimble displacement gauges.

[0040] An implementation of the pressure applicator 4: The pressure applicator 4 includes a cross beam 43, the pressure points are fixed at the bottom of the cross beam 43, a driving member 44 is provided at the upper end of the cross beam 43, and the driving member 44 is located between two pressure points. The driving member 44 presses the cross beam 43 downward, and the cross beam 43 applies pressure to both ends of the test beam 1 through the pressure points respectively.

[0041] As another implementation of the present utility model: One pressure point is a fixed support 41, and the other pressure point is a sliding support 42.

[0042] An implementation of the sliding support 42: Refer to the appendix Figure 7 , the sliding support 42 includes a first base 421, a roller 422 is provided on the first base 421, the roller 422 can roll on the first base 421, the rotating shaft 423 on the roller 422 slides along the strip hole 100 on the base, the roller 422 is rotatably connected to the rotating shaft 423, a top plate 424 is provided above the roller 422, there is a certain distance between the first base 421 and the top plate 424, fixing rods 425 are provided at both ends of the top plate 424, and a connecting member 426 is sleeved between the fixing rod 425 and the rotating shaft 423. The fixing rod 425 and the rotating shaft 423 can move within the connecting member 426. The top plate 424 is fixed to the cross beam 43 by bolts, and the first base 421 is fixed to the test beam 1 by bolts. The top plate 424 realizes horizontal movement by rolling the roller 422 on the first base 421, and the top plate 424 can also realize up and down flipping by rotating the fixing rod 425 within the connecting member 426.

[0043] An implementation of the fixed support 41: Refer to the appendix Figure 8 , the fixed support 41 includes a second base, a support block with a triangular cross-section is fixed on the second base, a top plate 424 is provided above the support block, connecting plates are fixed at both ends of the top plate 424, arc-shaped holes are provided on the connecting plates, and a sliding rod on the support block slides along the arc-shaped holes.

[0044] Specifically, the structure of the first support base 51 is the same as that of the fixed support 41, and the structure of the second support base 52 is the same as that of the sliding support 42.

[0045] The utility model simulates the cracking test of the bridge deck anti-cracking seal layer by pressing down the test beam to test the performance of various anti-cracking seal layers, so as to obtain a better anti-cracking seal layer. Refer to the attached Figure 10 , when the load of the test beam reaches the ultimate bearing capacity, the high-performance fiber seal layer does not crack and has good waterproof effect. Refer to the attached Figure 9 , in the traditional waterproof coating scheme, when the load of the test beam does not reach the ultimate bearing capacity, the anti-cracking seal layer cracks and leaks. The high-performance fiber seal layer obtained through testing can greatly improve the anti-cracking performance and waterproofness of the bridge asphalt pavement layer, improve the durability of the asphalt pavement layer and the main structure of the bridge, and extend the service life of the bridge deck and the main structure. Specifically, the high-performance fiber seal layer is composed of two thin layers of asphalt wrapping fibers. It is simple to construct and can effectively prevent the cracks of the bridge deck from reflecting upward and causing asphalt cracking. It can replace the traditional bridge deck anti-cracking seal layer, and its waterproof performance and toughness are greatly improved compared with the traditional anti-cracking seal layer. On the other hand, the application of the traditional simply supported to continuous beam bridge with a bridge deck is limited due to problems such as cracking of the bridge deck at the negative moment and resulting in asphalt pavement cracking and water seepage. The high-performance fiber seal layer obtained through testing breaks through the bottleneck of the existing technology and can greatly increase the application range of simply supported to continuous beam bridges on expressways and municipal bridges.

[0046] Finally, the method of this application is only a preferred implementation scheme and is not used to limit the protection scope of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0047] Although the embodiments of the utility model are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A test device for a high-performance crack-resistant seal layer of infrastructure, characterized in that, It includes a test beam, in which a steel mesh is provided. At the middle position of the upper end of the test beam, a test groove is provided. At the top of the test beam, a crack-resistant sealing layer is provided, and part of the crack-resistant sealing layer covers the test groove. A detection liquid is provided in the test groove. Above the test beam, a pressure applicator is provided. The test groove is located between two pressure points of the pressure applicator. Below the test beam, a support frame is provided.

2. The test device for the high-performance crack-resistant seal layer of the infrastructure according to claim 1, characterized in that, A displacement meter is provided at the bottom of the test beam.

3. The test device for the high-performance crack-resistant seal layer of the infrastructure according to claim 1, characterized in that, The steel mesh includes a plurality of connecting bars horizontally arranged in the test beam, and a plurality of connecting frames are fixed on the connecting bars.

4. The test device for the high-performance crack-resistant seal layer of the infrastructure according to claim 2, wherein, No connecting frames are distributed below the test groove.

5. The test device for the high-performance crack-resistant seal layer of the infrastructure according to claim 1, characterized in that, The groove wall of the test groove is inclined, and the aperture of the groove opening of the test groove is larger than the aperture of the groove bottom.

6. The test device for the high-performance crack-resistant seal layer of the infrastructure according to claim 2, characterized in that, The support frame includes a first support seat and a second support seat, and both the first support seat and the second support seat are located between the two pressure points.

7. The test device for the high-performance crack-resistant seal layer of the infrastructure according to claim 6, characterized in that, The displacement meters are distributed at both ends and the middle position of the test beam.

8. The test device for the high-performance crack-resistant seal layer of the infrastructure according to claim 7, characterized in that, The pressure applicator includes a cross beam, the pressure points are fixed at the bottom of the cross beam, and a driving member is provided at the upper end of the cross beam, and the driving member is located between the two pressure points.

9. The test device for the high-performance crack-resistant seal coat of the infrastructure according to claim 8, characterized in that, One of the pressure points is a fixed support, and the other pressure point is a sliding support.

10. The test device for the high-performance crack-resistant seal coat of infrastructure according to claim 9, characterized in that, The sliding support includes a first base, a roller is provided on the first base, the rotating shaft on the roller slides along the strip hole on the base, a top plate is provided above the roller, fixed rods are provided at both ends of the top plate, and a connecting member is sleeved between the fixed rod and the rotating shaft.

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