Clamping device for bonding pull-out test of fiber concrete

Abstract

The utility model discloses a clamping device for a fiber concrete bonding pull-out test, which relates to the technical field of experimental equipment and comprises a first fixing seat, a second fixing seat, a third fixing seat and a fourth fixing seat. The concrete test block clamp is used for clamping and fixedly assembling a fixed mold with a concrete test block, and the concrete test block clamp is rotatably arranged on the first fixed seat along a first axis; the fiber clamp is fixedly connected with a testing machine and is used for clamping and fixing a fiber part of the concrete test block. The concrete test block clamp is rotatably arranged on the first fixing seat along the first axis, and the angle of the fiber part of the concrete test block can be adjusted, so that the fiber parts with different embedding angles can be adjusted to the direction perpendicular to the fiber clamp, and the fiber clamp can clamp the fiber parts conveniently; therefore, the concrete test block can be fixed with the concrete test block clamp and the fiber clamp, the bonding pull-out test can be carried out on the concrete test blocks with different embedding angles, the test efficiency is high, and the result is accurate.

Description

Technical Field

[0001] This utility model relates to the field of experimental equipment technology, and in particular to a clamping device for fiber-reinforced concrete bond pull-out test. Background Technology

[0002] In related technologies, the interfacial bonding performance between fibers and the concrete matrix has a significant impact on the effectiveness of fiber reinforcement and directly relates to the overall macroscopic mechanical properties and failure mode of fiber-reinforced concrete. However, current testing machines can only perform pull-out tests on vertically embedded fibers, making it difficult to fix fiber-reinforced concrete at different embedding angles. Therefore, there is an urgent need for a comprehensive device that can stably clamp fiber-reinforced concrete for multi-angle fiber-reinforced concrete bond-pull-out tests, based on a testing machine. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a clamping device for fiber-reinforced concrete bond-pull-out tests, enabling high testing efficiency and accurate results for concrete specimens at different embedment angles.

[0004] The fiber-reinforced concrete bond pull-out test clamping device according to an embodiment of the present invention includes: a first fixed base for fixed connection with a testing machine; a concrete block clamp for clamping and fixing a fixed mold on which a concrete block is mounted, the concrete block clamp being rotatably disposed on the first fixed base along a first axis, and the first fixed base for driving the concrete block clamp to rotate to adjust the position of the concrete block clamp relative to the first fixed base, the first axis extending along a first direction; and a fiber clamp for fixed connection with the testing machine, the fiber clamp and the concrete block clamp being disposed opposite to and spaced apart along a second direction, the fiber clamp being used to clamp and fix the fiber portion of the concrete block, the first direction and the second direction being perpendicular.

[0005] According to the fiber-reinforced concrete bond-pull-out test clamping device of this utility model embodiment, by setting the concrete specimen clamp rotatably mounted on the first fixed seat along the first axis, the angle of the fiber part of the concrete specimen can be adjusted so that the fiber parts with different embedment angles can be adjusted to the direction perpendicular to the fiber clamp, which facilitates the fiber clamp to hold the fiber part, thereby fixing the concrete specimen to both the concrete specimen clamp and the fiber clamp. It can perform bond-pull-out tests on concrete specimens with different embedment angles, with high test efficiency and accurate results.

[0006] In some embodiments of this utility model, the concrete test block clamp includes: a sleeve and a first clamping structure. The sleeve is rotatably disposed on a first fixed seat along a first axis. The sleeve forms an installation groove that opens toward the fiber clamp. The installation groove is used to embed and fix the mold. The first clamping structure is disposed on the sleeve and is used to clamp and fix the mold.

[0007] In some embodiments of this utility model, the sleeve includes an inner sleeve and an outer sleeve. The outer sleeve is rotatably disposed on a first fixed seat along a first axis. The outer sleeve is open toward the fiber clamp. The outer sleeve is sleeved on the inner sleeve. The inner sleeve has an installation groove. The inner sleeve is rotatable relative to the outer sleeve around the central axis of the inner sleeve to drive the fixed mold to rotate synchronously. A first clamping structure is disposed on the outer sleeve.

[0008] In some embodiments of this utility model, the sleeve further includes: a sleeve retaining ring, the inner sleeve having a protrusion extending out of the open end of the outer sleeve, the outer peripheral wall of the protrusion having an external thread structure, the sleeve retaining ring having an assembly hole, the inner side wall of the assembly hole having an internal thread structure, the protrusion passing through the assembly hole, and the external thread structure and the internal thread structure being connected in a mating manner, the sleeve retaining ring being used to lock or unlock the inner sleeve and the outer sleeve.

[0009] In some embodiments of this utility model, the first clamping structure includes: a plurality of sub-clamping parts, which are arranged sequentially along the circumference of the sleeve, and are used to clamp and fix the mold.

[0010] In some embodiments of this utility model, the sub-clamping part includes: an elastic element, a first fixing rod, and a clamping arm. The first fixing rod is fixed to the outer sleeve and extends radially along the sleeve. The middle part of the clamping arm is connected to the end of the first fixing rod away from the sleeve. The clamping arm is rotatably disposed on the first fixing rod along a second axis. The second axis is perpendicular to the second direction. Along the second direction, the elastic element is compressed and connected between the end of the clamping arm away from the fiber clamp and the outer sleeve. The end of the clamping arm facing the fiber clamp has a clamping section for clamping and fixing the mold.

[0011] In some embodiments of this utility model, the first fixed seat has an angle adjusting arm and an angle adjusting rod. The angle adjusting arm is arc-shaped and extends toward the fiber clamp in a second direction. The angle adjusting arm is located outside the sleeve and protrudes in a direction away from the sleeve. The angle adjusting arm has an angle adjusting hole that extends along the extension direction of the angle adjusting arm. The angle adjusting rod passes through the angle adjusting hole and can slide along the angle adjusting hole. The angle adjusting rod is fixedly connected to the sleeve. The position of the concrete test block clamp relative to the first fixed seat is adjusted by sliding the angle adjusting rod.

[0012] In some embodiments of this utility model, the first fixed base also has a first locking part, which is used to lock or unlock the angle adjustment rod and the angle adjustment arm.

[0013] In some embodiments of this utility model, the fiber clamp includes: a second fixed seat and a clamping mechanism. The second fixed seat is used to be fixedly connected to the testing machine, and the clamping mechanism is used to clamp and fix the fiber part. The clamping mechanism is slidably disposed on the second fixed seat along a first direction and can be fixed on the second fixed seat. The clamping mechanism is located on the side of the second fixed seat facing the concrete test block clamp.

[0014] In some embodiments of this utility model, the clamping mechanism includes: a support base and a second clamping structure. The support base is slidably disposed on and fixed to the second fixed base along a first direction, and the second clamping structure is slidably disposed on and fixed to the support base along a third direction. The first direction, the second direction and the third direction are perpendicular to each other.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a schematic diagram of the structure of the fiber-reinforced concrete bond pull-out test clamping device according to an embodiment of the present invention;

[0018] Figure 2 These are structural schematic diagrams of fixed molds of different specifications according to embodiments of this utility model;

[0019] Figure 3 This is a cross-sectional view of the sleeve according to an embodiment of the present utility model.

[0020] Figure label:

[0021] 100 clamping device for fiber-reinforced concrete bond pull-out test;

[0022] First fixed seat 1; angle adjusting arm 11; angle adjusting hole 111; angle adjusting rod 12; first locking part 13; first clamping column 14; displacement limiting steel frame 15;

[0023] Concrete test block clamp 2; sleeve 21; inner sleeve 211; mounting groove 212; outer sleeve 213; sleeve retaining ring 214; protrusion 215; external thread structure 216; assembly hole 217; boss 218; groove 219; first clamping structure 22; sub-clamping part 221; elastic element 222; first fixing rod 223; clamping arm 224; clamping section 225;

[0024] Fiber clamp 3; second fixing seat 31; clamping mechanism 32; support seat 321; second clamping structure 322; second clamping column 33;

[0025] Fixed mold 200; Assembly slot 201;

[0026] Fiber section 301. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0028] The following is for reference. Figures 1-3 The present invention describes a fiber-reinforced concrete bond-pull-out test clamping device 100 according to an embodiment of the present invention. The fiber-reinforced concrete bond-pull-out test clamping device 100 is used to clamp a concrete specimen. The testing machine cooperates with the fiber-reinforced concrete bond-pull-out test clamping device 100 to perform a bond-pull-out test on the concrete specimen.

[0029] like Figures 1-3 As shown, the fiber-reinforced concrete bond pull-out test clamping device 100 according to an embodiment of the present invention includes: a first fixed base 1, which is fixedly connected to a testing machine; a concrete block clamp 2, which is used to clamp and fix a fixed mold 200 on which a concrete block is mounted, the concrete block clamp 2 is rotatably disposed on the first fixed base 1 along a first axis, and the first fixed base 1 is used to drive the concrete block clamp 2 to rotate so as to adjust the position of the concrete block clamp 2 relative to the first fixed base 1, the first axis extending along a first direction; and a fiber clamp 3, which is fixedly connected to the testing machine, the fiber clamp 3 and the concrete block clamp 2 are disposed opposite to each other and spaced apart along a second direction, the fiber clamp 3 is used to clamp and fix the fiber part 301 of the concrete block, the first direction and the second direction are perpendicular.

[0030] The first fixing seat 1 may have a first clamping column 14, and the testing machine may clamp the first clamping column 14 so that the first fixing seat 1 is fixedly connected to the testing machine through the first clamping column 14. There may be multiple fixing molds 200, for example, there may be two, three, six or more fixing molds 200. All fixing molds 200 have assembly slots 201, and the assembly slots 201 of different fixing molds 200 have different sizes. This arrangement allows the fixing molds 200 to be adapted to concrete test blocks of different specifications, which is beneficial to improving the versatility of the fixing molds 200, and thus facilitates the assembly of concrete test blocks of different specifications into the appropriate fixing molds 200.

[0031] The concrete test block clamp 2 can clamp and fix the fixed mold 200 on which the concrete test block is assembled. The concrete test block clamp 2 can clamp the fixed mold 200 through, but is not limited to, spring clamps, bolt clamps, etc., so that the concrete test block can be assembled into the concrete test block clamp 2 through the fixed mold 200. The concrete test block clamp 2 is rotatably mounted on the first fixed base 1 along the first axis, the first axis extending along the first direction, the first direction being... Figure 1 In the X direction, the first fixed seat 1 is used to drive the concrete block clamp 2 to rotate. As some embodiments of this application, the first fixed seat 1 may have a motor for driving the concrete block clamp 2 to rotate. As some embodiments of this application, the first fixed seat 1 may have a driving part for driving the concrete block clamp 2 to rotate, so as to adjust the position of the concrete block clamp 2 relative to the first fixed seat 1, thereby adjusting the fixed mold 200 held by the concrete block clamp 2 and the concrete block within the fixed mold 200.

[0032] The fiber clamp 3 may have a second clamping post 33, allowing the fiber clamp 3 to be fixedly connected to the testing machine via the second clamping post 33. The fiber clamp 3 and the concrete specimen clamp 2 are arranged opposite each other along a second direction, i.e. Figure 1 In the Y direction, the first direction and the second direction are perpendicular, that is, the X direction is perpendicular to the Y direction. The fiber clamp 3 and the concrete specimen clamp 2 are set apart, and the concrete specimen block is pre-embedded with fiber part 301. The spacing between the fiber clamp 3 and the concrete specimen clamp 2 can make the position of the fiber clamp 3 and the concrete specimen clamp 2 reasonable, which is conducive to forming a space between the fiber clamp 3 and the concrete specimen clamp 2 to accommodate the fiber part 301 of the concrete specimen block, and reducing the risk of interference between the fiber part 301 and the fiber clamp 3.

[0033] Adjusting the position of the concrete block clamp 2 relative to the first fixed seat 1 can adjust the pre-embedded steel bars in the concrete block to be perpendicular to the fiber clamp 3, so that the fiber clamp 3 can clamp and fix the fiber part 301 of the concrete block. This allows the concrete block to be fixed with both the concrete block clamp 2 and the fiber clamp 3. At this time, the testing machine pulls on both the first clamping column 14 and the second clamping column 33, so that the concrete block clamp 2 and the fiber clamp 3 can jointly apply force to the concrete block to achieve the effect of bonding pull-out test on the concrete block.

[0034] By setting up the fiber-reinforced concrete bond-pull test clamping device 100, the angle of the fiber part 301 of the concrete specimen can be adjusted and the concrete specimen can be stably clamped. This is beneficial for the testing machine to successfully carry out bond-pull tests on concrete specimens with different embedment angles. The test results are highly accurate. Furthermore, the fiber-reinforced concrete bond-pull test clamping device 100 has a simple structure and a convenient experimental method, which helps to improve test efficiency and save test time.

[0035] Specifically, when conducting bond pull-out tests on concrete specimens at different angles, the fiber portion 301 can be pre-embedded in the concrete specimen at a certain experimental angle. This application takes the 60° bond pull-out test on the concrete specimen as an example. The concrete specimen with the 60° fiber portion 301 pre-embedded is assembled into the assembly groove 201 of the fixed mold 200 with a suitable size. The assembly groove 201 has an open end. It can be understood that the fiber portion 301 of the concrete specimen is designed to face the outside of the fixed mold 200 through the open end.

[0036] The fixed mold 200 and the concrete specimen are assembled together in the concrete specimen clamp 2. The first fixed seat 1 is adjusted to drive the concrete specimen clamp 2 to rotate 60° along the first axis, so that the fiber part 301 of the concrete specimen rotates to a vertical position (i.e., a position perpendicular to the fiber clamp 3), so that the fiber clamp 3 can smoothly clamp and fix the fiber part 301 of the concrete specimen. The first clamping column 14 and the second clamping column 33 are fixedly connected to the testing machine, so that the testing machine can apply a force opposite to each other to the concrete specimen clamp 2 and the fiber clamp 3, thereby performing a 60° bond-pull test on the concrete specimen.

[0037] Therefore, by setting the concrete specimen clamp 2 rotatably on the first fixed seat 1 along the first axis, the angle of the fiber part 301 of the concrete specimen can be adjusted so that the fiber part 301 with different embedment angles can be adjusted to the direction perpendicular to the fiber clamp 3, so that the fiber clamp 3 can hold the fiber part 301. In this way, the concrete specimen can be fixed with both the concrete specimen clamp 2 and the fiber clamp 3, and the bonding pull-out test can be carried out on concrete specimens with different embedment angles. The test efficiency is high and the results are accurate.

[0038] In some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, the concrete test block clamp 2 may include: a sleeve 21 and a first clamping structure 22. The sleeve 21 is rotatably disposed on the first fixed seat 1 along the first axis. The sleeve 21 forms an installation groove 212 that opens toward the fiber clamp 3. The installation groove 212 is used to embed and fix the mold 200. The first clamping structure 22 is disposed on the sleeve 21 and is used to clamp and fix the mold 200.

[0039] The sleeve 21 has an installation groove 212 that opens towards the fiber clamp 3. The fixing mold 200 can be assembled into the installation groove 212 through the open end of the installation groove 212. The sleeve 21 is rotatably mounted on the first fixing seat 1 along the first axis. By adjusting the position of the sleeve 21 and the first fixing seat 1, the angle of the fixing mold 200 in the installation groove 212 can be adjusted so that the fiber part 301 is perpendicular to the fiber clamp 3. A first clamping structure 22 is provided on the sleeve 21. For example, the first clamping structure 22 can be provided on the sleeve 21 by means of screwing, snap-fitting, etc. The first clamping structure 22 is used to clamp and fix the fixing mold 200 so that the fixing mold 200 and the sleeve 21 can rotate synchronously along the first axis, thereby smoothly adjusting the angle of the fiber part 301. It can also reduce the risk of the concrete specimen falling off the open end of the installation groove 212 during the rotation of the sleeve 21 along the first axis, which is beneficial to improving the stability and safety of the experiment.

[0040] In some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, the sleeve 21 may include an inner sleeve 211 and an outer sleeve 213. The outer sleeve 213 is rotatably disposed on the first fixed base 1 along the first axis. The outer sleeve 213 is open toward the fiber clamp 3. The outer sleeve 213 is sleeved on the inner sleeve 211. The inner sleeve 211 has an installation groove 212. The inner sleeve 211 is rotatable relative to the outer sleeve 213 around the central axis of the inner sleeve 211 to drive the fixed mold 200 to rotate synchronously. The first clamping structure 22 is disposed on the outer sleeve 213.

[0041] The outer sleeve 213 is open towards the fiber clamp 3 and is fitted onto the inner sleeve 211. The outer sleeve 213 is rotatably mounted on the first fixed base 1 along the first axis. By adjusting the position of the outer sleeve 213 and the first fixed base 1, the angle of the fixed mold 200 in the mounting groove 212 of the inner sleeve 211 can be adjusted, so that the fiber portion 301 of the concrete test block in the fixed mold 200 is perpendicular to the fiber clamp 3. The inner sleeve 211 has a mounting groove 212 that is open towards the fiber clamp 3, and the fixed mold 200 can be assembled into the mounting groove 212 through the open end of the mounting groove 212.

[0042] In some embodiments of this application, the inner sleeve 211 has a boss 218 extending along the outer peripheral wall of the inner sleeve 211. The boss 218 is formed at the end of the inner sleeve 211 opposite to the open end of the mounting groove 212. The outer sleeve 213 has a groove 219 extending along the inner peripheral wall of the outer sleeve 213. The groove 219 is sized to match the boss 218. Fitting the boss 218 into the groove 219 can limit the inner sleeve 211 in the second direction, reducing the risk of the inner sleeve 211 falling out of the open end of the outer sleeve 213. Furthermore, the inner sleeve 211 is rotatable relative to the outer sleeve 213 about its central axis. In some embodiments of this application, the inner sleeve 211 and the outer sleeve 213 can also be connected by a pivot. The first clamping structure 22 is located on the outer sleeve 213. This arrangement allows the position of the first clamping structure 22 to be set reasonably, reducing the space occupied by the first clamping structure 22 in the mounting groove 212.

[0043] The first fixed base 1 has an angle adjustment arm 11 and an angle adjustment rod 12. The angle adjustment rod 12 passes through the angle adjustment hole 111 and can slide along the angle adjustment hole 111. The angle adjustment rod 12 is fixedly connected to the sleeve 21. The position of the concrete specimen clamp 2 relative to the first fixed base 1 can be adjusted by sliding the angle adjustment rod 12. By making the inner sleeve 211 rotatable relative to the outer sleeve 213 around the central axis of the inner sleeve 211, the fixed mold 200 can be driven to rotate synchronously, thereby driving the concrete specimen to rotate synchronously. This causes the fiber part 301 to turn to the same plane or parallel plane as the angle adjustment arm 11, and to point to the side away from the angle adjustment arm 11. This reduces the risk of interference between the fiber part 301 and the angle adjustment arm 11 during subsequent angle adjustments, which is beneficial to the smooth progress of the experiment.

[0044] In some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, the sleeve 21 may further include: a sleeve retaining ring 214, the inner sleeve 211 having a protrusion 215 extending out of the open end of the outer sleeve 213, the outer peripheral wall of the protrusion 215 having an external thread structure 216, the sleeve retaining ring 214 having an assembly hole 217, the inner sidewall of the assembly hole 217 having an internal thread structure, the protrusion 215 passing through the assembly hole 217, and the external thread structure 216 and the internal thread structure engaging and connecting, the sleeve retaining ring 214 being used to lock or unlock the inner sleeve 211 and the outer sleeve 213.

[0045] The inner sleeve 211 has a protruding portion 215 that extends beyond the open end of the outer sleeve 213 and has an external thread structure 216 formed on its outer peripheral wall. A sleeve retaining ring 214 has a mounting hole 217 that matches the shape and size of the protruding portion 215. The inner wall of the mounting hole 217 has an internal thread structure. The protruding portion 215 is inserted into the mounting hole 217, and the external thread structure 216 and the internal thread structure are threadedly connected. This locks the inner sleeve 211 and the outer sleeve 213, ensuring that the fiber portion 301 is always in the same plane as the angle adjustment arm 11 or in a plane parallel to the angle adjustment arm 11. This allows the fiber portion 301 to move synchronously with the outer sleeve 213, facilitating the adjustment of the fiber portion 301 to a position perpendicular to the fiber clamp 3 by adjusting the position of the outer sleeve 213 relative to the first fixed seat 1. Understandably, by disengaging the external thread structure 216 and the internal thread structure, the inner sleeve 211 and the outer sleeve 213 can be unlocked, so that the corresponding fiber section 301 can be smoothly adjusted in the next experiment, so that the corresponding fiber section 301 is turned to the same plane or parallel plane as the angle adjustment arm 11.

[0046] In some embodiments of this utility model, such as Figure 1 As shown, the first clamping structure 22 includes a plurality of sub-clamping parts 221, which are arranged sequentially along the circumference of the sleeve 21, and are used to clamp and fix the fixing mold 200.

[0047] The sub-clamping part 221 can be configured in multiple ways, such as two, three, four or more. This application uses four sub-clamping parts 221 as an example for illustration. All four sub-clamping parts 221 are used to clamp and fix the fixed mold 200. Furthermore, the four sub-clamping parts 221 are arranged sequentially along the circumference of the sleeve 21. This arrangement can improve the stability of the fixed mold 200 and make the fixed mold 200 uniformly stressed along the circumference, reducing the risk of the fixed mold 200 falling off or even being damaged due to uneven stress on the fixed mold 200, which is beneficial to improving the stability of the experiment.

[0048] In some embodiments of this utility model, such as Figure 1As shown, the sub-clamping part 221 may include: an elastic element 222, a first fixing rod 223 and a clamping arm 224. The first fixing rod 223 is fixed to the outer sleeve 213 and extends radially along the sleeve 21. The middle part of the clamping arm 224 is connected to the end of the first fixing rod 223 away from the sleeve 21. The clamping arm 224 is rotatably disposed on the first fixing rod 223 along a second axis. The second axis is perpendicular to the second direction. Along the second direction, the elastic element 222 is compressed and connected between the end of the clamping arm 224 away from the fiber clamp 3 and the outer sleeve 213. The end of the clamping arm 224 facing the fiber clamp 3 has a clamping section 225 for clamping and fixing the fixing mold 200.

[0049] The first fixing rod 223 is fixed to the outer sleeve 213. For example, the first fixing rod 223 can be fixed to the outer sleeve 213 by means of integral molding, snap-fit, etc., and the first fixing rod 223 extends radially along the sleeve 21. The middle part of the clamping arm 224 is connected to the end of the first fixing rod 223 away from the sleeve 21. The clamping arm 224 is rotatably disposed on the first fixing rod 223 along the second axis. The second axis is perpendicular to the second direction, so that the clamping arm 224 can selectively lock or unlock the mold 200. Along the second direction, the elastic element 222 is compressed and connected between the end of the clamping arm 224 facing away from the fiber clamp 3 and the outer sleeve 213. The end of the clamping arm 224 facing the fiber clamp 3 has a clamping section 225 for clamping and fixing the mold 200. When it is necessary to assemble the mold 200, the clamping section 225 is manually moved so that the clamping arm 224 rotates along the second axis against the elastic force of the elastic element 222, thereby fully opening the mounting groove 212, and the mold 200 is smoothly assembled into the mounting groove 212 from the open end. At this time, the experimenter no longer moves the clamping section 225. Under the elastic force of the elastic element 222, the clamping arm 224 and the clamping section 225 return to their original positions to smoothly clamp and fix the mold 200.

[0050] In some embodiments of this utility model, such as Figure 1 As shown, the first fixed base 1 has an angle adjustment arm 11 and an angle adjustment rod 12. The angle adjustment arm 11 is arc-shaped and extends toward the fiber clamp 3 in the second direction. The angle adjustment arm 11 is located outside the sleeve 21 and protrudes in the direction away from the sleeve 21. The angle adjustment arm 11 forms an angle adjustment hole 111, which extends along the extension direction of the angle adjustment arm 11. The angle adjustment rod 12 passes through the angle adjustment hole 111 and can slide along the angle adjustment hole 111. The angle adjustment rod 12 is fixedly connected to the sleeve 21. The position of the concrete test block clamp 2 relative to the first fixed base 1 can be adjusted by sliding the angle adjustment rod 12.

[0051] The first fixed base 1 may also have a displacement limiting steel frame 15 to reduce the risk of displacement of the sleeve 21 along the first direction. The angle adjusting arm 11 is arc-shaped and extends towards the fiber clamp 3 along the second direction. The angle adjusting arm 11 is located outside the sleeve 21 and protrudes away from the sleeve 21. This arrangement makes the structural design of the angle adjusting arm 11 reasonable and reduces the risk of interference between the sleeve 21 and the angle adjusting arm 11 during the rotation of the sleeve 21. The angle adjusting arm 11 has an angle adjusting hole 111, which extends along the extension direction of the angle adjusting arm 11. The angle adjusting rod 12 passes through the angle adjusting hole 111 and is slidable along the angle adjusting hole 111. The angle adjustment rod 12 is fixedly connected to the sleeve 21. For example, the angle adjustment rod 12 and the sleeve 21 can be fixedly connected by bolts, snap-fit, etc. The angle adjustment rod 12 can slide along the angle adjustment hole 111 to drive the sleeve 21 to rotate in the first direction, thereby adjusting the position of the concrete specimen clamp 2 relative to the first fixed seat 1, and then rotating the fiber part 301 to a vertical position (i.e., a position perpendicular to the fiber clamp 3), so that the fiber clamp 3 can smoothly clamp and fix the fiber part 301 of the concrete specimen.

[0052] In some embodiments of this utility model, such as Figure 1 As shown, the first fixed base 1 also has a first locking part 13, which is used to lock or unlock the angle adjustment rod 12 and the angle adjustment arm 11.

[0053] The first fixed base 1 also has a first locking part 13. For example, the first locking part 13 can be constructed as two opposing knobs or as a locking buckle. The first locking part 13 is used to lock or unlock the angle adjustment rod 12 and the angle adjustment arm 11. After the fiber part 301 is adjusted, the opposing knobs can be moved toward each other so that the angle adjustment rod 12 is fixedly clamped between the two opposing knobs. The first locking part 13 locks the angle adjustment rod 12 and the angle adjustment arm 11 to facilitate subsequent experimental operations. After the experiment is completed, the first locking part 13 can be unlocked to unlock the angle adjustment rod 12 and the angle adjustment arm 11. At this time, under the action of gravity, the sleeve 21 returns to its original position, which is conducive to the open end of the sleeve 21 facing the vertical downward direction, thereby facilitating the removal of the fixed mold 200 so that the fiber-reinforced concrete bond pull-out test clamping device 100 can be used for subsequent experiments, improving the repeatability of the fiber-reinforced concrete bond pull-out test clamping device 100.

[0054] In some embodiments of this utility model, such as Figure 1As shown, the fiber clamp 3 may include: a second fixed base 31 and a clamping mechanism 32. The second fixed base 31 is used to be fixedly connected to the testing machine, and the clamping mechanism 32 is used to clamp and fix the fiber part 301. The clamping mechanism 32 is slidably disposed on the second fixed base 31 along the first direction and can be fixed to the second fixed base 31. The clamping mechanism 32 is located on the side of the second fixed base 31 facing the concrete test block clamp 2.

[0055] The second fixed base 31 may have a second clamping post 33, which is fixedly connected to the testing machine, thus allowing the fiber clamp 3 to be fixedly connected to the testing machine. The clamping mechanism 32 is used to clamp and fix the fiber part 301. The clamping mechanism 32 is slidably disposed on the second fixed base 31 along the first direction and can be fixed to the second fixed base 31. For example, the clamping mechanism 32 can be fixed to the second fixed base 31 by means of fixing knobs, fixing hooks, etc. By making the clamping mechanism 32 slidably disposed on the second fixed base 31 along the first direction, the clamping mechanism 32 can be moved to a position corresponding to the fiber part 301 in the first direction. The clamping mechanism 32 is located on the side of the second fixed base 31 facing the concrete specimen clamp 2. This arrangement allows the clamping mechanism 32 to be positioned reasonably, which is conducive to the clamping mechanism 32 facing the concrete specimen, thereby successfully clamping the fiber part 301, and thus allowing the testing machine to successfully perform the bond pull-out test on the concrete specimen through the fiber concrete bond pull-out test clamping device 100.

[0056] In some embodiments of this utility model, such as Figure 1 As shown, the clamping mechanism 32 may include: a support base 321 and a second clamping structure 322. The support base 321 is slidably disposed on the second fixed base 31 along the first direction and can be fixed to the second fixed base 31. The second clamping structure 322 is slidably disposed on the support base 321 along the third direction and can be fixed to the support base 321. The first direction, the second direction and the third direction are perpendicular to each other.

[0057] The support base 321 is slidably disposed on the second fixed base 31 along the first direction, and the support base 321 can be fixed to the second fixed base 31 by means of, but not limited to, a fixed knob, a fixed hook, etc. The second clamping structure 322 is slidably disposed on the support base 321 along the third direction, i.e. Figure 1The second clamping structure 322 is fixed to the support base 321 by means of, but not limited to, a fixing knob or a fixing hook. By making the second clamping structure 322 slidably disposed on the support base 321 along the third direction, the second clamping structure 322 can be moved to a position corresponding to the fiber part 301 in the third direction, so that the second clamping structure 322 can smoothly clamp the fiber part 301, thereby enabling the testing machine to smoothly perform a bond pull-out test on the concrete specimen through the fiber concrete bond pull-out test clamping device 100. The first direction, the second direction, and the third direction are perpendicular to each other, that is, the X direction, the Y direction, and the Z direction are perpendicular to each other.

[0058] As some embodiments of this application, for concrete specimens with multiple pre-embedded limiting parts, multiple clamping mechanisms 32 and a second clamping structure 322 can be added to the second fixed seat 31 to conduct bond pull-out tests at any position and in any number of quantities, thereby further improving the versatility of the fiber-reinforced concrete bond pull-out test clamping device 100.

[0059] As some embodiments of this application, such as Figure 1 As shown, a study requires a bond-pull-out test of fiber-reinforced 301 concrete, with the following parameters: the concrete specimen type is a cylindrical concrete block from which a single fiber-reinforced 301 is pulled out. The dimensions of the cylindrical concrete block are 50mm × 100mm; the total length of the fiber-reinforced 301 is 35mm, the embedment depth is 10mm, and the embedment angle is 60°. The fiber-reinforced 301 concrete bond-pull-out test clamping device disclosed in this utility model is proposed to be used. The specific steps are as follows:

[0060] The first step is to use the upper clamp of the general testing machine to clamp the first clamping column 14, and similarly use the lower clamp to clamp the second clamping column 33, fix the concrete block clamp 2 and the fiber part 301 clamp, and loosen all the fastening knobs in advance, i.e., the first locking part 13 in the above embodiment.

[0061] The second step is to select a fixed mold 200 of the corresponding size according to the concrete test block size of 50mm×100mm and insert it. Open the first clamping structure 22 set in the outer sleeve 213 and insert the fixed mold 200 of the size of 50mm×100mm into the inner sleeve 211. Then, fix the fixed mold 200 into the first clamping structure 22.

[0062] The third step is to rotate the inner sleeve 211 to turn the embedded fiber part 301 to the same plane or parallel plane as the angle adjustment arm 11, and make sure that the fiber part 301 points to the side where the angle adjustment arm 11 is not set during rotation. After the rotation is completed, tighten the sleeve retaining ring 214 to fix the inner sleeve 211 to the outer sleeve 213.

[0063] Fourth step: Taking the fiber section 301 embedding angle of 60° as a reference, rotate the angle adjustment rod 12 so that the outer sleeve 213 rotates until the embedded fiber section 301 is vertically downward. At the same time, adjust according to whether the angle on the angle adjustment arm 11 corresponds to the fiber section 301 embedding angle of 60°. After it is completely vertical, tighten the first locking part 13 to fix the angle adjustment rod 12 on the angle adjustment arm 11.

[0064] Fifth step: Adjust the vertical position of the fiber section 301 so that it is just above the second clamping structure 322 to adjust the preparatory position of the second clamping structure 322; adjust the longitudinal position of the support base 321 so that the support base 321 and the fiber section 301 are on the same plane; tighten the fixing knob to fix the support base 321 to the second fixing base 31; slide the second clamping structure 322 that is clipped on the support base 321 and align the clamp with the fiber section 301 to be pulled; tighten the fixing knob to fix the second clamping structure 322 on the support base 321 and turn the clamp knob to open the clamp for use.

[0065] Step 6: Adjust the vertical position of the fiber section 301 and the second clamping structure 322 until the fiber section 301 clamp can stably clamp the fiber section 301, and then tighten the chuck knob to clamp the fiber section 301.

[0066] Step 7: Start the testing machine control panel to complete the pull-out test.

[0067] As one embodiment of this application, this example involves embedding three fiber sections 301 with the same embedding angle on the same specimen. To save time, the pull-out test is required to be performed simultaneously, as follows:

[0068] First, use the upper clamp of the general testing machine to clamp the first clamping column 14, and similarly use the lower clamp to clamp the second clamping column 33; fix the concrete block clamp 2 and the fiber part 301 clamp, and loosen all the fastening knobs in advance.

[0069] The second step is to select a 50mm×100mm fixed mold 200 according to the size of the concrete test block, insert it, open the first clamping structure 22 set in the outer sleeve 213 and embed the 50mm×100mm fixed mold 200 into the inner sleeve 211, and fix the fixed mold 200 into the first clamping structure 22.

[0070] The third step is to rotate the inner sleeve 211 to turn the embedded fiber part 301 to the same plane or parallel plane as the angle adjustment arm 11, and make sure that the fiber part 301 points to the side where the angle adjustment arm 11 is not set during rotation. After the rotation is completed, tighten the sleeve retaining ring 214 to fix the inner sleeve 211 to the outer sleeve 213.

[0071] Fourth step: Taking the fiber section 301 embedding angle of 60° as a reference, rotate the angle adjustment rod 12 so that the outer sleeve 213 rotates until the embedded fiber section 301 is vertically downward. At the same time, adjust according to whether the angle on the angle adjustment arm 11 corresponds to the fiber section 301 embedding angle of 60°. After it is completely vertical, tighten the first locking part 13 to fix the angle adjustment rod 12 on the angle adjustment arm 11.

[0072] Fifth step: Based on the number of 3 fiber sections 301 embedded in the test block, select 3 sets of support seats 321 and install them on the second fixed seat 31, ensuring that the 3 sets of support seats 321 have second clamping structures 322 corresponding to the fiber sections 301; adjust the vertical position of the fiber sections 301 so that they are just above the second clamping structures 322, thereby adjusting the preparatory position of the second clamping structures 322; adjust the longitudinal position of the 3 sets of support seats 321 so that the 3 fiber sections 301 have corresponding support seats 321 on the same plane, tighten the fixing knob to secure the 3 sets of support seats 321 to the second fixed seat 31; slide the second clamping structure 322 that is clipped on the support seat 321 and align the clamp with the 3 fiber sections 301 to be pulled, tighten the fixing knob to fix the second clamping structure 322 on the support seat 321 and rotate the clamp knob to open the clamp for use.

[0073] Step 6: Adjust the vertical position of the fiber section 301 and the second clamping structure 322 until the fiber section 301 clamp can stably clamp the fiber section 301, and then tighten the chuck knob to clamp the fiber section 301.

[0074] Step 7: Start the testing machine control panel to complete the pull-out test.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0076] Although embodiments of the present invention have been shown and described, those skilled in the art will understand 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 claims and their equivalents.

Claims

1. A fiber reinforced concrete bond pull test fixture, comprising: The utility model relates to a concrete test block fixing device for a testing machine, comprising: a first fixing base for fixed connection with the testing machine; a concrete test block clamp for clamping a fixed mold provided with a concrete test block, the concrete test block clamp being rotatably arranged on the first fixing base along a first axis, and the first fixing base being used to drive the concrete test block clamp to rotate so as to adjust the position of the concrete test block clamp relative to the first fixing base, the first axis extending along a first direction; a fiber clamp for fixed connection with the testing machine, the fiber clamp and the concrete test block clamp being arranged opposite and spaced apart along a second direction, the fiber clamp being used to clamp a fiber part of the concrete test block, the first direction and the second direction being perpendicular.

2. The fiber reinforced concrete bond pull test fixture of claim 1, wherein, The concrete test block clamp comprises a sleeve and a first clamping structure, the sleeve being rotatably arranged on the first fixing base along the first axis, the sleeve being formed with a mounting groove open towards the fiber clamp, the mounting groove being used to embed the fixed mold, and the first clamping structure being arranged on the sleeve and used to clamp the fixed mold.

3. The fiber reinforced concrete bond pull test fixture of claim 2, wherein, The sleeve comprises an inner sleeve and an outer sleeve, the outer sleeve being rotatably arranged on the first fixing base along the first axis, the outer sleeve being open towards the fiber clamp, the outer sleeve being sleeved on the inner sleeve, the inner sleeve being formed with the mounting groove, and the inner sleeve being rotatable about a central axis of the inner sleeve relative to the outer sleeve so as to drive the fixed mold to rotate synchronously, and the first clamping structure being arranged on the outer sleeve.

4. The fiber reinforced concrete bond pull test fixture of claim 3, wherein, The sleeve further comprises a sleeve clamping ring, the inner sleeve has a protruding portion protruding out of the open end of the outer sleeve, an outer thread structure is formed on the outer peripheral wall of the protruding portion, the sleeve clamping ring is formed with an assembly hole, an inner thread structure is formed on the inner side wall of the assembly hole, the protruding portion is arranged in the assembly hole, and the outer thread structure and the inner thread structure are connected in cooperation, and the sleeve clamping ring is used to lock or unlock the inner sleeve and the outer sleeve.

5. The fiber reinforced concrete bond pull test fixture of claim 3, wherein, The first clamping structure comprises a plurality of sub-clamping portions arranged in sequence along the circumference of the sleeve, and the plurality of sub-clamping portions are used to clamp the fixed mold.

6. The fiber reinforced concrete bond pull test fixture of claim 5, wherein, The sub-clamping portion comprises an elastic member, a first fixing rod and a clamping arm, the first fixing rod is fixedly arranged on the outer sleeve and extends along the radial direction of the sleeve, the middle part of the clamping arm is connected to one end of the first fixing rod away from the sleeve, the clamping arm is rotatably arranged on the first fixing rod along a second axis, the second axis is perpendicular to the second direction, along the second direction, the elastic member is connected in compression between the end of the clamping arm away from the fiber clamp and the outer sleeve, and the end of the clamping arm facing the fiber clamp has a clamping segment used to clamp the fixed mold.

7. The fiber reinforced concrete bond pull test fixture of claim 2, wherein, The first fixing base has an angle adjusting arm and an angle adjusting rod. The angle adjusting arm is configured in a circular arc shape and extends towards the fiber clamp along the second direction. The angle adjusting arm is located outside the sleeve and protrudes away from the sleeve. The angle adjusting arm is formed with an angle adjusting hole extending along the extending direction of the angle adjusting arm. The angle adjusting rod is arranged in the angle adjusting hole and is slidable along the angle adjusting hole. The angle adjusting rod is fixedly connected with the sleeve. The position of the concrete block clamp relative to the first fixing base is adjusted by sliding the angle adjusting rod.

8. The fiber reinforced concrete bond pull test fixture of claim 7, wherein, The first fixing base further has a first locking part for locking or unlocking the angle adjusting rod and the angle adjusting arm.

9. The fiber reinforced concrete bond pull test fixture of any one of claims 1-8, wherein, The fiber clamp includes a second fixing base and a clamping mechanism. The second fixing base is used for fixedly connecting with the testing machine. The clamping mechanism is used for clamping and fixing the fiber part. The clamping mechanism is slidably arranged in the second fixing base along the first direction and is fixable to the second fixing base. The clamping mechanism is located on the side of the second fixing base facing the concrete block clamp.

10. The fiber reinforced concrete bond pull test fixture of claim 9, wherein, The clamping mechanism includes a support base and a second clamping structure. The support base is slidably arranged in the second fixing base along the first direction and is fixable to the second fixing base. The second clamping structure is slidably arranged in the support base along a third direction and is fixable to the support base. The first direction, the second direction and the third direction are perpendicular to each other.

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