A device for testing the crack resistance of basalt fiber modified concrete

Abstract

This invention discloses a device for testing the crack resistance of basalt fiber modified concrete, belonging to the field of concrete crack resistance testing technology. It includes a testing seat and an inner ring. The inner ring is disposed on the surface of the testing seat, and a plastic sleeve is disposed on the surface of the inner ring. A rotating handle is installed on the top of the inner ring, and an adjustment component is disposed at the bottom of the rotating handle. A second rotating disk is rotatably mounted inside the testing seat, and a clamping component is disposed on the side wall of the second rotating disk. This invention, through the designed testing seat, inner ring, plastic sleeve, rotating handle, and adjustment component, achieves adjustment of the inner ring diameter, flexibly adapting to the constraint stiffness requirements of different engineering scenarios and avoiding the limitations of fixed stiffness. The clamping component provides multi-directional synchronous all-round balanced clamping of the outer ring, avoiding eccentric deviations caused by manual installation, ensuring the coaxiality of the inner and outer rings, avoiding uneven ring width problems, and improving the accuracy and reliability of the test data.

Description

Technical Field

[0001] This invention relates to the field of concrete crack resistance testing technology, specifically to a device for testing the crack resistance of basalt fiber modified concrete. Background Technology

[0002] In modern rail transit, high-rise buildings, and other civil engineering fields, early cracking of concrete structures is one of the core issues restricting the service life of engineering projects. Ordinary concrete is prone to micro-cracks due to hydration heat shrinkage and drying shrinkage deformation, which gradually expand and significantly reduce the impermeability and durability of the structure. Basalt fiber modified concrete, through the bridging and crack-inhibiting effect of fibers, can significantly optimize the crack resistance of concrete, making it a preferred material for civil engineering projects. The crack resistance performance testing device for basalt fiber modified concrete uses a ring-type concrete crack resistance testing device as the core testing unit. The well-mixed basalt fiber modified concrete mixture is poured into the ring mold cavity, vibrated to compact, and then pre-cured to reach the initial hardening state, simulating the temperature and humidity service environment of the engineering site. The ring structure provides uniform circumferential constraints for the concrete specimen, restoring the actual constraint stress state of the structure, and capturing the cracking behavior when the tensile stress generated by shrinkage exceeds its early tensile strength. The early crack resistance performance of concrete is evaluated based on key indicators such as the first cracking time, the number of cracks, the maximum crack width, and the total crack length.

[0003] However, in practical applications, the inner ring of existing circular concrete crack resistance testing devices often adopts an integrated structure, providing a fixed value of constraint stiffness for the specimen. This makes it impossible to simulate diverse engineering constraint environments and accurately match the actual stress state. Furthermore, the installation of the inner and outer rings of existing devices relies on manual positioning, which can easily lead to misalignment between the inner and outer rings during installation. This results in uneven distribution of the ring width of the specimen in the circumferential direction, causing uneven circumferential constraint stress on the concrete specimen during curing and shrinkage. This interferes with the collection of core testing data such as crack initiation time and propagation rate, leading to distorted evaluation results of the crack resistance performance of basalt fiber modified concrete and failing to provide a reliable basis for engineering material selection.

[0004] To address the aforementioned issues, innovative design based on existing methods is urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a device for testing the crack resistance of basalt fiber modified concrete, in order to solve the problems mentioned in the background art regarding the fixed inner ring constraint stiffness and the tendency for the outer ring to become misaligned when manually installed. The technical solution of this invention addresses the problem that the existing technical solutions are too simplistic and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a testing device for the crack resistance performance of basalt fiber modified concrete, comprising a testing seat and an inner ring, wherein the inner ring is provided on the surface of the testing seat, a plastic sleeve is provided on the surface of the inner ring, a rotating handle is installed on the top of the inner ring, an adjusting component is provided at the bottom of the rotating handle, a second rotating disk is rotatably installed inside the testing seat, and a clamping component is provided on the side wall of the second rotating disk;

[0007] The clamping assembly includes four traction rods rotatably mounted on the side wall of the second rotating disk, with clamping blocks rotatably mounted at the ends of the traction rods. The surface of the detection seat has a first moving groove. The assembly also includes a drive rod slidably mounted on the side wall of the detection seat, with an unlocking rod slidably mounted inside the drive rod. The end of the unlocking rod is fixed with a moving seat, and a moving block is fixed inside the moving seat. The assembly also includes a locking seat slidably mounted inside the drive rod, with a locking block fixed to the side wall of the locking seat, and a second moving groove on the surface of the locking seat.

[0008] Preferably, the clamping block is slidably installed in the first moving groove, the driving rod is rotatably connected to the traction link, and the traction link has an arc design.

[0009] Preferably, the detection seat is provided with limiting teeth inside, and the sidewall shape of the locking block corresponds to the limiting teeth.

[0010] Preferably, the second moving groove is designed to be inclined, and the moving block is located inside the second moving groove.

[0011] Preferably, a return spring is provided at the end of the unlocking rod, and the unlocking rod is connected to the side wall of the locking seat through the return spring.

[0012] Preferably, the adjustment assembly includes a first rotating disk fixed to the bottom of the rotating handle, the surface of the first rotating disk having a guide groove, a limiting seat fixed inside the inner ring, the surface of the limiting seat having a limiting groove, and five movable rods slidably installed inside the inner ring, the ends of the movable rods being fixed with inner support plates, and the other ends of the movable rods being fixed with guide shafts.

[0013] Preferably, the guide groove is designed with an arc, and the end of the guide shaft is located inside the guide groove.

[0014] Preferably, the limiting groove is designed in a straight line, and the moving rod is slidably installed in the limiting groove.

[0015] Preferably, the inner support plate is tightly attached to the plastic sleeve.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] This invention, through the design of a testing seat, inner ring, plastic sleeve, rotating handle, and adjusting components, enables adjustment of the inner ring diameter, flexibly adapting to the constraint stiffness requirements of different engineering scenarios and avoiding the limitations of fixed stiffness. The rotating handle drives the adjusting components, causing the inner support plate to push the plastic sleeve outwards synchronously, resulting in controllable and uniform deformation of the plastic sleeve. The plastic sleeve possesses both excellent tensile properties and structural stability, ensuring a sealed internal environment for the inner ring, preventing grout leakage during concrete pouring, while providing stable hardness support. This ensures smooth and efficient subsequent concrete pouring operations, improves the compatibility of test data with actual working conditions, and guarantees the regularity of specimen formation.

[0018] This invention, through its specially designed clamping components, achieves multi-directional, synchronous, and balanced clamping of the outer ring, avoiding the eccentricity deviations inherent in manual installation, ensuring the coaxiality of the inner and outer rings, and preventing uneven ring width. Simultaneously, the locking block and limiting teeth work together to lock the position of the clamping components, ensuring stable fixation of the outer ring position, improving installation efficiency, providing a stable structural foundation for concrete pouring and subsequent crack resistance testing, and enhancing the accuracy and reliability of the test data. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the detection seat of the present invention;

[0021] Figure 3 This is a cross-sectional view of the inner ring of the present invention;

[0022] Figure 4 This is a schematic diagram of the disassembled structure of the adjustment component of the present invention;

[0023] Figure 5 This is a cross-sectional view of the detection seat of the present invention;

[0024] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle;

[0025] Figure 7 This is a cross-sectional view of the drive rod of the present invention;

[0026] Figure 8 This is a partial cross-sectional view of the drive rod of the present invention.

[0027] In the diagram: 1. Detection seat; 101. Limiting tooth; 2. Inner ring; 201. Plastic sleeve; 3. Rotating handle; 301. First rotating disk; 302. Guide groove; 4. Inner support plate; 401. Moving rod; 402. Guide shaft; 5. Limiting seat; 501. Limiting groove; 6. Second rotating disk; 601. Pulling link; 602. Clamping block; 603. First moving groove; 7. Drive rod; 701. Unlocking rod; 702. Moving seat; 703. Moving block; 8. Locking seat; 801. Locking block; 802. Second moving groove. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-8 The present invention provides a technical solution: a device for testing the crack resistance of basalt fiber modified concrete, including a testing seat 1 and an inner ring 2. The inner ring 2 is provided on the surface of the testing seat 1, and a plastic sleeve 201 is provided on the surface of the inner ring 2. A rotating handle 3 is installed on the top of the inner ring 2, and an adjustment component is provided at the bottom of the rotating handle 3. A second rotating disk 6 is rotatably installed inside the testing seat 1, and a clamping component is provided on the side wall of the second rotating disk 6.

[0030] The clamping assembly includes four traction rods 601 rotatably mounted on the side wall of the second rotating disk 6, with clamping blocks 602 rotatably mounted at the ends of the traction rods 601. A first moving groove 603 is provided on the surface of the detection seat 1. The assembly also includes a drive rod 7 slidably mounted on the side wall of the detection seat 1, with an unlocking rod 701 slidably mounted inside the drive rod 7. A moving seat 702 is fixed at the end of the unlocking rod 701, and a moving block 703 is fixed inside the moving seat 702. The assembly also includes a locking seat 8 slidably mounted inside the drive rod 7, with a locking block 801 fixed on the side wall of the locking seat 8. A second moving groove 802 is provided on the surface of the locking seat 8. Through the sliding linkage of the unlocking rod 701 and the guiding transmission of the tilting second moving groove 802, the locking seat 8 can be precisely extended and retracted. The locking block 801 and the limiting tooth 101 engage to achieve a stable lock, preventing the clamping assembly from loosening during the detection process, ensuring the stability of the outer ring fixation, and providing structural protection for the reliability of the detection data.

[0031] In one embodiment of the present invention, the clamping block 602 is slidably installed in the first moving groove 603. The clamping block 602 provides guidance and limit to ensure that the four clamping blocks 602 move synchronously, avoid deviation or jamming during clamping, ensure the balance of clamping the outer ring, and improve the coaxiality accuracy of the inner ring 2 and the outer ring. The drive rod 7 is rotatably connected to the traction connecting rod 601 to realize flexible transmission between the two. The traction connecting rod 601 has an arc design to adapt to the transmission trajectory between the drive rod 7 and the second rotating disk 6, and avoid motion interference.

[0032] In one embodiment of the present invention, the detection seat 1 is provided with a limiting tooth 101 inside. The side wall shape of the locking block 801 corresponds to the limiting tooth 101. The locking block 801 and the limiting tooth 101 form a stable toothed locking structure, ensuring that the locking block 801 can smoothly fit into the gap of the limiting tooth 101. At the same time, it can accurately disengage when unlocking, avoiding problems such as jamming and misalignment, improving the smoothness and reliability of the locking mechanism operation, ensuring that the outer ring is always in a stable and fixed state, and providing a guarantee for the smooth conduct of subsequent tests.

[0033] As one embodiment of the present invention, the second moving groove 802 is designed with an inclination, and the moving block 703 is located in the second moving groove 802. The inclination of the second moving groove 802 converts the linear axial movement of the moving block 703 with the unlocking rod 701 into the radial extension and retraction movement of the locking seat 8 along the driving rod 7, ensuring that the extension and retraction movement of the locking seat 8 is smooth and stable, and improving the smoothness of unlocking and locking operations.

[0034] In one embodiment of the present invention, a return spring is provided at the end of the unlocking rod 701. The unlocking rod 701 is connected to the side wall of the locking seat 8 through the return spring. After the unlocking rod 701 is released, the elastic restoring force of the return spring can drive the unlocking rod 701 to slide in the opposite direction along the axial direction, and simultaneously drive the moving seat 702, the moving block 703 and the locking seat 8 to reset, so that the locking block 801 automatically and precisely engages with the limiting tooth 101, ensuring the continuity and stability of the clamping and fixing of the outer ring.

[0035] In one embodiment of the present invention, the adjustment assembly includes a first rotating disk 301 fixed to the bottom of the rotating handle 3, the surface of the first rotating disk 301 having a guide groove 302, a limiting seat 5 fixed inside the inner ring 2, the surface of the limiting seat 5 having a limiting groove 501, and five movable rods 401 slidably installed inside the inner ring 2. An inner support plate 4 is fixed to one end of each movable rod 401, and a guide shaft 402 is fixed to the other end of each movable rod 401. Rotating the handle 3 drives the first rotating disk 301 to rotate, and the guide groove 302 drives the five sets of movable rods 401 to move synchronously in a straight line along the limiting groove 501 through meshing transmission with the guide shaft 402. This drives the inner support plate 4 to push the plastic sleeve 201 outward evenly, so that the sleeve produces controllable deformation to adjust the constraint stiffness of the inner ring 2.

[0036] As one embodiment of the present invention, the guide groove 302 is designed with an arc, and the end of the guide shaft 402 is located inside the guide groove 302. The arc-shaped guide groove 302 provides guidance for the movement of the moving rod 401, driving the inner support plate 4 to push the plastic sleeve 201 evenly, ensuring that the constraint stiffness of the inner ring 2 is adjusted evenly and controllably.

[0037] In one embodiment of the present invention, the limiting groove 501 is designed in a straight line, and the moving rod 401 is slidably installed in the limiting groove 501. The limiting groove 501 provides a straight guiding constraint for the moving rod 401, ensuring that the moving rod 401 can only move in a straight line in the radial direction, avoiding deviation in the pushing angle of the inner support plate 4, and ensuring consistent deformation of the plastic sleeve 201.

[0038] In one embodiment of the present invention, the inner support plate 4 is tightly attached to the plastic sleeve 201. The tight fit between the inner support plate 4 and the plastic sleeve 201 allows the pushing force of the moving rod 401 to be evenly transmitted to the inner wall of the plastic sleeve 201, avoiding uneven stretching and deformation of the plastic sleeve 201 caused by excessive local stress. This ensures that a regular circular constraint space is formed after the diameter of the inner ring 2 is adjusted, accurately matching the preset engineering constraint stiffness requirements and improving the fit between the testing environment and the actual working conditions.

[0039] Working principle: When using this basalt fiber modified concrete crack resistance testing device, first place the assembled outer ring on the surface of the testing seat 1, then press the unlocking rod 701 to slide it into the drive rod 7. During the movement of the unlocking rod 701, the movable seat 702 fixed at its end synchronously drives the movable block 703 to move. Since the movable block 703 is located in the second movable groove 802 and the second movable groove 802 is inclined, the movement of the unlocking rod 701 drives the locking seat 8 to slide into the drive rod 7, so that the locking block 801 moves away from the limiting tooth 101, releasing the constraint on the drive rod 7. At this time, the drive rod 7 can move freely.

[0040] The drive rod 7 is pushed to move into the detection seat 1. The drive rod 7 drives the pull rod 601 connected to its side wall to move synchronously. The pull rod 601 has an arc design to adapt to the transmission trajectory requirements. While the drive rod 7 moves linearly, it drives the second rotating disk 6 to rotate around the central axis through the pull rod 601. The second rotating disk 6 drives the four clamping blocks 602 to move radially synchronously through the four evenly distributed pull rods 601, so as to achieve all-round balanced clamping of the outer ring. After the outer ring is fixed in place, the unlocking rod 701 is released. The unlocking rod 701 moves in the opposite direction to reset under the elastic reset action of the reset spring. The locking block 801 moves closer to the limit tooth 101 to complete the engagement, and completes the position locking of the clamping component, ensuring the stability of the outer ring fixation, avoiding the eccentric deviation that is easy to be generated by manual installation, and ensuring the coaxiality accuracy of the inner ring 2 and the outer ring.

[0041] Then, the handle 3 is turned. As the handle 3 rotates, the first rotating disk 301, which is fixedly connected to its bottom end, rotates synchronously. The inner wall of the guide groove 302 with an arc design on the surface of the first rotating disk 301 presses against the guide shaft 402. At the same time, the moving rod 401 is slidably installed in the limiting groove 501 on the surface of the limiting seat 5, providing guidance and constraint for the moving rod 401. While the first rotating disk 301 rotates, the moving rod 401 pulls the inner support plate 4, which moves linearly along the limiting groove 501 and pushes the plastic sleeve 201 outward, causing the plastic sleeve 201 to produce controllable and uniform deformation, changing the diameter of the inner ring 2 to adapt to the constraint stiffness requirements of different engineering scenarios. The plastic sleeve 201 has both excellent tensile characteristics and structural stability, ensuring the integrity of the sealing environment inside the inner ring 2 and avoiding leakage problems during subsequent concrete pouring. At the same time, it provides stable hardness support to ensure smooth concrete pouring operations.

[0042] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting the crack resistance of basalt fiber modified concrete, comprising a detection seat (1) and an inner ring (2), characterized in that: The detection seat (1) is provided with an inner ring (2), the inner ring (2) is provided with a plastic sleeve (201), the top of the inner ring (2) is provided with a rotating handle (3), the bottom of the rotating handle (3) is provided with an adjustment component, the detection seat (1) is rotatably installed with a second rotating disk (6), and the side wall of the second rotating disk (6) is provided with a clamping component; The clamping assembly includes four traction rods (601) rotatably mounted on the side wall of the second rotating disk (6), with clamping blocks (602) rotatably mounted at the ends of the traction rods (601), and a first moving groove (603) opened on the surface of the detection seat (1). It also includes a drive rod (7) slidably mounted on the side wall of the detection seat (1), with an unlocking rod (701) slidably mounted inside the drive rod (7), a moving seat (702) fixed at the end of the unlocking rod (701), and a moving block (703) fixed inside the moving seat (702). It also includes a locking seat (8) slidably mounted inside the drive rod (7), with a locking block (801) fixed on the side wall of the locking seat (8), and a second moving groove (802) opened on the surface of the locking seat (8). The adjustment assembly includes a first rotating disk (301) fixed to the bottom of the rotating handle (3), the surface of the first rotating disk (301) being provided with a guide groove (302), a limiting seat (5) fixed inside the inner ring (2), the surface of the limiting seat (5) being provided with a limiting groove (501), and five moving rods (401) slidably installed inside the inner ring (2), the ends of the moving rods (401) being fixed with an inner support plate (4), and the other ends of the moving rods (401) being fixed with a guide shaft (402). The guide groove (302) is designed with an arc, the end of the guide shaft (402) is located in the guide groove (302), the limiting groove (501) is designed with a straight line, the moving rod (401) is slidably installed in the limiting groove (501), and the inner support plate (4) is tightly attached to the plastic sleeve (201).

2. The device for detecting the anti-cracking performance of basalt fiber modified concrete according to claim 1, characterized in that: The clamping block (602) is slidably installed in the first moving groove (603), and the driving rod (7) is rotatably connected to the pulling rod (601), which has an arc design.

3. The device for testing the crack resistance of basalt fiber modified concrete according to claim 1, characterized in that: The detection seat (1) is provided with a limiting tooth (101) inside, and the side wall shape of the locking block (801) corresponds to the limiting tooth (101).

4. The device for testing the crack resistance of basalt fiber modified concrete according to claim 1, characterized in that: The second moving slot (802) is designed to be inclined, and the moving block (703) is located inside the second moving slot (802).

5. The device for testing the crack resistance of basalt fiber modified concrete according to claim 1, characterized in that: The unlocking rod (701) is provided with a return spring at its end, and the unlocking rod (701) is connected to the side wall of the locking seat (8) through the return spring.

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