A performance testing device for anti-cracking agent of side wall

Abstract

The utility model discloses a kind of anti-cracking agent performance detection devices for side wall, comprising: bottom plate, the bottom plate is to install crack inducer, narrow side plate and wide side plate;Crack inducer, the crack inducer is vertically arranged on the bottom plate, the crack inducer is regular polygonal prism, one edge of the crack inducer is aligned with wide side plate;Narrow side plate, the number of the narrow side plate is two, and symmetrically spaced detachably arranged on the bottom plate, the bottom side end of the narrow side plate is provided with narrow plate bottom folding edge;Wide side plate, the number of the wide side plate is two, and symmetrically spaced arranged on the bottom plate. Provide a kind of vertical side wall formula structure anti-cracking detection device different from traditional flat plate anti-cracking detection device, since crack inducer is vertically arranged in mould, therefore the test block made can be close to engineering practice, effectively simulate engineering site side wall into mould feature, demoulding time and curing condition, so that experimental data is more referential.

Description

Technical Field

[0001] This utility model belongs to the technical field of building material testing devices, and in particular relates to a device for testing the performance of crack-resistant agents for side walls. Background Technology

[0002] Concrete, as a typical brittle material, is resistant to compression but not to tension, making crack control a core issue for engineering durability. The current "Standard for Test Methods of Long-Term Performance and Durability of Concrete" (GB / T 50082) specifies a horizontal slab structure for crack resistance testing, using an internal crack inducer to assess the crack area on the slab surface. Slab structures, through secondary finishing, film covering for moisture retention, and geotextile insulation, can significantly reduce the risk of cracking. Furthermore, water spraying or water retention curing of slab structures is simple and easy, making crack control relatively straightforward. Conversely, sidewalls are the areas with the greatest risk and damage from cracking. Under the constraint of reinforcement and the matrix, sidewalls are prone to cracking when subjected to internal temperature stress, drying shrinkage, chemical shrinkage, and autogenous shrinkage stress. Moreover, underground concrete sidewalls directly bear the lateral water pressure from groundwater; once cracked, they will cause water leakage and harmful ion corrosion, severely impacting the structural suitability and durability. Therefore, crack-resistant agents are usually added to the concrete of the side wall to improve crack resistance and durability. However, the slab structure in the "Standard for Test Methods of Long-term Performance and Durability of Concrete" (GB / T 50082) is not comparable for evaluating the crack resistance of different crack-resistant agents in the side wall structure.

[0003] Therefore, there is an urgent need for a new type of crack detection device to solve the above problems. Summary of the Invention

[0004] The purpose of this utility model is to address the problems existing in the prior art by providing a device for testing the performance of crack-resistant agents for sidewalls, comprising:

[0005] A base plate for mounting a crack inducer, a narrow side plate, and a wide side plate;

[0006] A crack inducer is vertically mounted on the base plate. The crack inducer is a regular polygonal prism, and one of its edges is aligned with the wide side plate.

[0007] Narrow side panels, the number of which is two, are symmetrically spaced and detachably disposed on the base plate, and the bottom end of the narrow side panels is provided with a narrow plate bottom fold;

[0008] The wide side plate consists of two wide side plates, which are symmetrically spaced on the base plate. The bottom end of the wide side plate is provided with a wide plate bottom fold, and both sides of the wide side plate are provided with wide plate side folds. The two wide plate side folds of the wide side plate are detachably connected to the narrow side plate.

[0009] The above technical solution provides a vertical sidewall-type crack detection device that differs from traditional flat plate crack detection devices. Thanks to the vertical structure, the crack inducer can be rigidly connected to the base plate, allowing for concrete demolding without disassembling the crack inducer. This reduces experimental operations and improves testing efficiency. Furthermore, since the crack inducer is vertically arranged inside the mold, the produced test blocks closely resemble actual engineering conditions (vertical steel reinforcement frames installed inside the sidewall), effectively simulating the entry point of the sidewall into the mold, demolding time, and curing conditions on-site, thus making the experimental data more reliable.

[0010] Optionally, the crack inducer has an even number of sides, and the number of sides is not less than four and not more than eight. A concrete protective layer space is reserved between the edge of the wide side plate directly opposite the crack inducer and the two wide side plates, and the thickness is not less than 20mm. By designing the protective layer space, the concrete coverage thickness is ensured to meet the specification requirements, preventing the inducer from being directly exposed and reflecting the crack resistance performance of the protective layer in the actual structure.

[0011] Optionally, the number of crack inducers is multiple, and they are linearly and uniformly distributed on the base plate.

[0012] Optionally, the height of the crack inducer does not exceed the height of the narrow side plate or the wide side plate.

[0013] Optionally, both the narrow plate bottom fold and the wide plate bottom fold are connected to the base plate by bolts, and the two wide plate side folds of the wide side plate are respectively connected to the narrow side plate by bolts.

[0014] Optionally, the wide side of the base plate is provided with a first rotating frame that can be rotatably slid into the bottom fold of the narrow plate, and the long side of the base plate is provided with a second rotating frame that can be rotatably slid into the bottom fold of the wide plate.

[0015] Both the inner sides of the first rotating frame and the inner sides of the second rotating frame are provided with pressure plates. The pressure plate on the inner side of the first rotating frame abuts against the upper surface of the bottom folded edge of the narrow plate, and the pressure plate on the inner side of the second rotating frame abuts against the upper surface of the bottom folded edge of the wide plate. The rotation frames are used to enable tool-free installation of the side plates, allowing the pressure plates to directly press against the folded edge, which greatly shortens the assembly time.

[0016] Optionally, extrusion grooves are provided on the upper edges of the four sides of the base plate, the bottom of the narrow plate bottom fold, and the bottom of the wide plate bottom fold. An elastic block is placed in the extrusion groove. The initial thickness of the elastic block is greater than the depth of the extrusion groove. The elastic block is deformed by extrusion to fill the gap, adaptively compensating for manufacturing tolerances and deformations. The sealing effect is far superior to that of hard contact.

[0017] Optionally, two vertically extending limiting grooves are provided on one side of the narrow side plate, and a limiting strip adapted to the limiting grooves is provided on the side of the wide plate side fold facing the narrow side plate. The side plate can be quickly aligned by the limiting strip cooperating with the limiting groove, avoiding manual adjustment errors and preventing the wide side plate from tilting outward. The narrow side plate and the wide plate side fold are connected by fasteners. The fastener locking slot enhances the shear resistance of the connection point, which can prevent the narrow side plate from tilting outward and maintain the integrity of the mold.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This application provides a vertical sidewall-type structural crack detection device that differs from traditional flat plate crack detection devices. Thanks to the vertical structure, the crack inducer can be rigidly connected to the base plate, and concrete demolding can be completed without disassembling the crack inducer, thereby reducing experimental operations and improving testing efficiency. At the same time, since the crack inducer is vertically arranged inside the mold, the produced test blocks can closely resemble the actual engineering situation (vertical steel reinforcement frame set inside the sidewall), effectively simulating the sidewall entry point, demolding time and curing conditions on the engineering site, making the experimental data more reliable.

[0020] 2. This application utilizes a rotating frame to achieve tool-free installation of the side panels, allowing the pressure plate to directly press against the folded edge, significantly shortening the assembly time. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a performance testing device for a sidewall crack-resistant agent provided in Embodiment 1 of this utility model;

[0022] Figure 2 This is a cross-sectional schematic diagram of a sidewall crack-resistant agent performance testing device provided in Embodiment 1 of this utility model;

[0023] Figure 3 This is a schematic diagram of a performance testing device for a sidewall crack-resistant agent provided in Embodiment 2 of this utility model;

[0024] Figure 4 This utility model Figure 3 A magnified diagram is shown in section A.

[0025] Figure 5 This is a cross-sectional schematic diagram of the connection state between the bottom plate and the narrow side plate in Embodiment 2 of this utility model;

[0026] Figure 6 This is a schematic diagram of the base plate in Embodiment 2 of this utility model;

[0027] Figure 7 This utility model Figure 6 Enlarged view of point B in the middle;

[0028] Figure 8This is a schematic diagram of the narrow side plate in Embodiment 2 of this utility model;

[0029] Figure 9 This is a schematic diagram of the wide side plate in Embodiment 2 of this utility model.

[0030] In the diagram: 1. Base plate; 2. Crack inducer; 3. Narrow side plate; 31. Narrow plate bottom fold; 32. Limiting groove; 4. Wide side plate; 41. Wide plate bottom fold; 42. Wide plate side fold; 43. Limiting strip; 5. Bolt; 6. Movable groove; 71. First rotating frame; 72. Second rotating frame; 8. Pressure plate; 9. Crowbar; 10. Extrusion groove; 11. Elastic block; 12. Slot; 13. Fastener. Detailed Implementation

[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] In the description of this utility model, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example 1:

[0033] like Figure 1 As shown in Figure 2, the specific scheme of the embodiment is as follows:

[0034] A device for testing the performance of crack-resistant agents for sidewalls, comprising:

[0035] Base plate 1, which is used to install crack inducer 2, narrow side plate 3 and wide side plate 4;

[0036] Crack inducers 2, and there are multiple crack inducers. In this embodiment, seven crack inducers are used. The crack inducers 2 are vertically and rigidly set on the base plate 1. The crack inducers 2 are regular polyprisms. One edge of the crack inducer 2 is aligned with the wide side plate 4. In addition, there are multiple crack inducers 2, and they are linearly and evenly distributed on the base plate 1. Furthermore, the height of the crack inducers 2 does not exceed the height of the narrow side plate 3 or the wide side plate 4.

[0037] Narrow side panels 3, there are two narrow side panels 3, which are symmetrically spaced and detachably installed on the base plate 1. The bottom end of the narrow side panel 3 is provided with a narrow plate bottom fold 31.

[0038] There are two wide side plates 4, which are symmetrically spaced on the base plate 1. The bottom end of the wide side plate 4 is provided with a wide plate bottom fold 41, and both sides of the wide side plate 4 are provided with wide plate side folds 42. The wide plate bottom fold 41 and the wide plate side folds 42 are located on the same side of the wide side plate 4. The two wide plate side folds 42 of the wide side plate 4 are detachably connected to the narrow side plate 3.

[0039] In this embodiment, a vertical sidewall structure crack detection device, which is different from the traditional flat plate crack detection device, is provided. Thanks to the characteristics of the vertical structure, the crack inducer 2 can be rigidly connected to the base plate 1. The concrete can be demolded without disassembling the crack inducer 2, which can reduce experimental operations, improve testing efficiency, and effectively evaluate the crack resistance of different crack-resistant agents in the sidewall structure.

[0040] In addition, since the crack inducer 2 is vertically arranged inside the mold, it is close to the vertically arranged steel frame in the actual project. Therefore, the test block produced can closely resemble the actual project and effectively simulate the entry point of the side wall into the mold, the demolding time and the curing conditions on the project site, thus making the experimental data more reliable.

[0041] In this embodiment, both the narrow bottom fold 31 and the wide bottom fold 41 are connected to the base plate 1 by bolts 5, and the two wide side folds 42 of the wide side plate 4 are connected to the narrow side plate 3 by bolts 5 respectively. The connection by bolts 5 is stable and reliable.

[0042] like Figure 1 As shown, in this embodiment, the crack inducer 2 has an even number of sides, and the number of sides is not less than four and not more than eight. In this embodiment, a regular hexagonal prism is used, with its two edges facing the two wide side plates 4. A concrete protective layer space is reserved between the edge of the wide side plate 4 facing the crack inducer 2 and the two wide side plates 4, and the thickness is not less than 20mm.

[0043] In the above technical solution, multi-directional stress is generated by using polygonal prisms to more realistically simulate the complex stress state in actual engineering. At the same time, the design of the protective layer space ensures that the concrete cover thickness meets the specifications, prevents the induction device from being directly exposed, and reflects the crack resistance performance of the protective layer in the actual structure.

[0044] The working process of the above embodiments is as follows:

[0045] Step 1: Apply a thin layer of release agent to the inner surface of the narrow side plate 3, the wide side plate 4, and the bottom plate 1 with the attached crack inducer 2 to reduce the adhesion between the concrete and the narrow side plate 3, the wide side plate 4, and the attached crack inducer 2.

[0046] Step 2: After applying the release agent, assemble and fix the side plate and the base plate 1 together using bolts 5;

[0047] Step 3: Pour the mixed concrete into the formwork from the top. It should be poured into the formwork in two stages, with each pour being half the height of the side panel. After each pour, use a vibrator to compact the concrete.

[0048] Step 4: After the concrete has set, remove all side panels and test and record the number, width, and area of ​​cracks.

[0049] Step 5: Perform curing under the same conditions as the lighting conditions and curing measures at the project site for 7 days, and record the crack development once a day.

[0050] Step 6: After the test is completed, summarize the crack data and remove the concrete specimens. Example 2:

[0051] The difference between this embodiment and Embodiment 1 lies in the connection method of the narrow bottom fold 31, the wide bottom fold 41, and the base plate 1, as detailed below. Figure 3-9 As shown:

[0052] Two movable grooves 6 are symmetrically opened on the narrow plate bottom fold 31, the wide plate bottom fold 41 and the four sides of the base plate 1. The movable groove 6 on the narrow plate bottom fold 31 corresponds to the movable groove 6 on the wide side of the base plate 1, and the movable groove 6 on the wide plate bottom fold 41 corresponds to the movable groove 6 on the long side of the base plate 1.

[0053] The two movable slots 6 on the wide side of the base plate 1 are provided with a first rotating frame 71 that can be inserted into the movable slot 6 on the narrow plate bottom fold 31, and the two movable slots 6 on the long side of the base plate 1 are provided with a second rotating frame 72 that can be inserted into the movable slot 6 on the wide plate bottom fold 41.

[0054] Pressure plates 8 are provided on the inner side of the first rotating frame 71 and the inner side of the second rotating frame 72. The pressure plate 8 on the inner side of the first rotating frame 71 abuts against the upper surface of the narrow plate bottom fold 31, and the pressure plate 8 on the inner side of the second rotating frame 72 abuts against the upper surface of the wide plate bottom fold 41.

[0055] In this embodiment, the side plate is installed without tools by using the cooperation of the movable groove 6 and the rotating frame 7, allowing the pressure plate 8 to directly press against the folded edge, which greatly shortens the assembly time. At the same time, when the rotating frame 7 is inserted into the movable groove 6, a self-locking structure can be formed to offset the side pressure of the concrete and prevent the side plate from shifting or leaking grout during vibration.

[0056] In this embodiment, in order to make it easier to rotate the first rotating frame 71 and the second rotating frame 72, a sleeve is provided on the surface of both the first rotating frame 71 and the second rotating frame 72, and a pry bar 9 that can be inserted into the sleeve is provided for the sleeve. Using the sleeve as a lever fulcrum, the pry bar 9 provides torque amplification, easily unlocking the rotating frame 7, reducing the intensity of manual operation and protecting the components from damage caused by violent disassembly.

[0057] In this embodiment, the crowbar 9 is a commonly used product. When in use, the crowbar 9 is inserted into one of the sleeves to turn the rotating frame. After one rotating frame is locked, the crowbar 9 is pulled out and inserted into another sleeve to lock the other rotating frames in turn.

[0058] Preferred, such as Figure 3 As shown, since the second rotating frame 72 has a long span, three sleeves are set at intervals on the second rotating frame 72. When rotating the second rotating frame 72, multiple pry bars 9 or three-pronged pry bars can be inserted into these three sleeves to turn the second rotating frame 72.

[0059] In this embodiment, the upper edge of the narrow plate bottom fold 31 and the upper edge of the wide plate bottom fold 41 are both rounded, which makes it easier for the rotating frame 7 to rotate from the side to the top of the wide plate bottom fold 41 / narrow plate bottom fold 31, reducing stress concentration caused by the edges.

[0060] In this embodiment, extrusion grooves 10 are provided on the upper edges of the four sides of the base plate 1, the bottom of the narrow plate bottom fold 31, and the bottom of the wide plate bottom fold 41. An elastic block 11 is placed in the extrusion groove 10. The initial thickness of the elastic block 11 is greater than the depth of the extrusion groove 10. The elastic block 11 is deformed by extrusion to fill the gap, adaptively compensating for manufacturing tolerances and deformation. The sealing effect is far superior to hard contact.

[0061] In this embodiment, two vertically extending limiting grooves 32 are provided on one side of the narrow side plate 3. The side of the wide plate side folded edge 42 facing the narrow side plate 3 is provided with a limiting strip 43 that is adapted to the limiting groove 32. The side plate can be quickly aligned by the limiting strip 43 cooperating with the limiting groove 32, avoiding manual adjustment errors and preventing the wide side plate 4 from tilting outward. Alignment slots 12 are provided on the two edges of the other side of the narrow side plate 3 and the wide plate side folded edge 42. The narrow side plate 3 and the wide plate side folded edge 42 are connected by fasteners 13. The fasteners 13 are inserted into the slots 12 on the adjacent narrow side plate 3 and wide plate side folded edge 42. The fasteners 13 lock the slots 12 to enhance the shear resistance of the connection point, prevent the narrow side plate 3 from tilting outward, and maintain the integrity of the mold.

[0062] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the performance of crack-resistant agents for sidewalls, characterized in that, include: A base plate for mounting a crack inducer, a narrow side plate, and a wide side plate; A crack inducer is vertically mounted on the base plate. The crack inducer is a regular polygonal prism, and one of its edges is aligned with the wide side plate. Narrow side panels, the number of which is two, are symmetrically spaced and detachably disposed on the base plate, and the bottom end of the narrow side panels is provided with a narrow plate bottom fold; The wide side plate consists of two wide side plates, which are symmetrically spaced on the base plate. The bottom end of the wide side plate is provided with a wide plate bottom fold, and both sides of the wide side plate are provided with wide plate side folds. The two wide plate side folds of the wide side plate are detachably connected to the narrow side plate.

2. The device for testing the performance of crack-resistant agents for sidewalls according to claim 1, characterized in that: The crack inducer has an even number of sides, and the number of sides is not less than four and not more than eight. A concrete protective layer space is reserved between the edge of the wide side plate facing the crack inducer and the two wide side plates, and the thickness is not less than 20mm.

3. The device for testing the performance of crack-resistant agents for sidewalls according to claim 1, characterized in that: The number of crack inducers is multiple, and they are linearly and uniformly distributed on the base plate.

4. The device for testing the performance of crack-resistant agents for sidewalls according to claim 1, characterized in that: The height of the crack inducer does not exceed the height of the narrow side plate or the wide side plate.

5. The device for testing the performance of crack-resistant agents for sidewalls according to claim 1, characterized in that: Both the narrow plate bottom fold and the wide plate bottom fold are connected to the base plate by bolts, and the two wide plate side folds of the wide side plate are respectively connected to the narrow side plate by bolts.

6. The device for testing the performance of crack-resistant agents for sidewalls according to claim 1, characterized in that: The wide side of the base plate is provided with a first rotating frame that can be rotatably slid into the bottom fold of the narrow plate, and the long side of the base plate is provided with a second rotating frame that can be rotatably slid into the bottom fold of the wide plate. Both the inner side of the first rotating frame and the inner side of the second rotating frame are provided with pressure plates. The pressure plate on the inner side of the first rotating frame abuts against the upper surface of the bottom fold of the narrow plate, and the pressure plate on the inner side of the second rotating frame abuts against the upper surface of the bottom fold of the wide plate.

7. The device for testing the performance of crack-resistant agents for sidewalls according to claim 1, characterized in that: The bottom edge of the four sides of the base plate, the bottom edge of the narrow plate bottom fold, and the bottom edge of the wide plate bottom fold are all provided with extrusion grooves. An elastic block is placed in the extrusion groove. In the initial state, the thickness of the elastic block is greater than the depth of the extrusion groove.

8. The device for testing the performance of crack-resistant agents for sidewalls according to claim 1, characterized in that: Two vertically extending limiting grooves are provided on one side of the narrow side plate, and a limiting strip adapted to the limiting grooves is provided on the side of the wide plate side fold facing the narrow side plate; the narrow side plate and the wide plate side fold are connected by fasteners.

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