Mechanical property testing device for hybrid directional fiber reinforced ultra-high performance concrete

Abstract

The application discloses a kind of mixed directional fiber super high performance concrete mechanical property testing device, including base, power mechanism is arranged on base, and the left and right sides of power mechanism are movably provided with fixed rotating assembly, and power mechanism drives the synchronous reverse movement of both sides fixed rotating assembly;The middle of base top is provided with support assembly, and loading assembly is provided above support assembly;Test piece is loaded between both sides fixed rotating assembly, this support assembly is used to support test piece, and can change support surface form according to test demand, and loading assembly is located upside of test piece, to apply vertical pressure to test piece;The device can collect various test data such as compression resistance, tensile resistance, torsion resistance and wear resistance in real time, can comprehensively reflect the mechanical property of mixed directional fiber super high performance concrete, provide accurate and reliable test basis for engineering application and performance optimization of the material, solve the problem that existing device test data is single and cannot meet engineering practice demand.

Description

Technical Field

[0001] This invention relates to the field of mechanical performance testing technology, specifically a testing device for the mechanical properties of ultra-high performance concrete with oriented fibers. Background Technology

[0002] Ultra-high performance concrete with oriented fiber reinforced polymer (OFRP) is widely used in bridges, high-rise buildings, and special engineering projects due to its high strength, high toughness, high durability, and excellent crack resistance. Its mechanical properties directly determine the safety and service life of the engineering structure, so it is of great significance to conduct accurate and comprehensive mechanical property testing on it.

[0003] Currently, existing testing devices have many shortcomings and are unable to meet diverse and high-precision testing needs: First, most testing devices have limited functions and can only perform single mechanical property tests. If multiple tests such as compressive strength, tensile strength, torsion strength, and wear resistance are required, multiple sets of testing equipment need to be replaced, which is cumbersome, inefficient, and costly. Second, the specimen clamping structure is poorly designed. Conventional clamping devices can only perform simple clamping and lack flexibility in adjusting the specimen's posture, thus only enabling single-posture testing of the specimen. Summary of the Invention

[0004] The purpose of this invention is to provide a testing device for the mechanical properties of ultra-high performance concrete with oriented fibers, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a mechanical performance testing device for ultra-high performance concrete with oriented fiber admixture, comprising a base, a power mechanism on the base, fixed rotating components movably disposed on both sides of the power mechanism, the power mechanism driving the fixed rotating components on both sides to move synchronously in opposite directions; a support component is disposed at the center of the top of the base, and a loading component is disposed above the support component; a specimen is loaded between the fixed rotating components on both sides, the support component is used to support the specimen and the form of the support surface can be changed according to the testing requirements, and the loading component is located on the upper side of the specimen to apply vertical pressure to the specimen;

[0006] The fixed rotation assembly includes a base, an annular frame, and a fixed frame. The base is slidably mounted on a power mechanism. An arc-shaped groove is provided at the top of the base, and the annular frame is slidably mounted in the arc-shaped groove. A first motor is provided on the base to drive the annular frame to rotate along its own axis, so that the annular frames on both sides can rotate in any posture according to the test requirements. The fixed frame is fixed to the middle of the annular frame by several lateral support rods. Several clamping plates are provided on the end face of the fixed frame near the support assembly. The clamping plates form a clamping groove for clamping the specimen.

[0007] Furthermore, the support assembly includes a fixed base and a plurality of first telescopic cylinders disposed within the fixed base. The plurality of first telescopic cylinders are arranged along the length direction of the fixed base. A support plate is provided at the end of the piston rod of the first telescopic cylinder. Limiting blocks are respectively provided on the front and rear sides of the top of the support plate, so that the corresponding first telescopic cylinder can be selectively driven to act according to the test conditions to form a suitable support surface.

[0008] Furthermore, the support plate has a stress transmission cavity inside, which is filled with a flexible force transmission medium. The upper surface of the support plate has a force transmission hole that communicates with the stress transmission cavity. During operation, the first telescopic cylinder pushes the support plate to support the specimen, and the flexible force transmission medium evenly distributes the pressure to the entire support plate, so that the support surface is subjected to uniform force.

[0009] Furthermore, the fixed base is provided with multi-segment independent drive guide rails, each segment of the guide rail corresponds to a set of first telescopic cylinders, and each segment of the guide rail can move independently along the length direction of the fixed base.

[0010] Furthermore, the clamping plate is made of metal; the end face of the clamping plate away from the fixing frame is provided with an inclined plate, and the inclined plates enclose each other to form a guide structure that gradually decreases in size from the outside to the inside; the inner surface of the inclined plate is provided with teeth.

[0011] Furthermore, the clamping plates are connected as a whole near the end of the fixing frame. The fixing frame has a fixing port in the middle that communicates with the clamping groove. Each side wall of the fixing port is hinged with a stabilizing plate. The stabilizing plate is inclined outward and connected to the fixing port with a torsion spring.

[0012] Furthermore, the power mechanism includes supports disposed on the left and right sides of the base, with a guide rod and a bidirectional lead screw connected between the two supports. The bidirectional lead screw is driven to rotate by a second motor. One side of the base is slidably connected to the guide rod, and the other side is threadedly connected to the bidirectional lead screw.

[0013] Furthermore, several guide wheels are provided at both ends of the arc-shaped slide, and the guide wheels abut against the arc-shaped frame; a gear ring is sleeved on the outer end of the ring frame, and a gear meshing with it is provided on the output shaft of the first motor.

[0014] Furthermore, the loading assembly includes a frame, a second telescopic cylinder, and a pressure plate. The frame is mounted on the upper side of the base, the second telescopic cylinder is fixedly connected to the frame, and the piston rod of the second telescopic cylinder extends through the frame to its lower part. The pressure plate is disposed on the first telescopic cylinder, and the two are connected by a universal ball joint. The pressure plate is detachably mounted with a pressure block. The bottom surface of the pressure plate has several slots, the top surface of the pressure block has corresponding locking strips, and the front end of the locking strips has a handle.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This device integrates multiple mechanical property testing functions, including compressive strength, bending strength, horizontal tensile strength, torsional strength, and surface wear resistance. It can complete multi-dimensional mechanical property testing of ultra-high performance concrete with oriented fiber reinforced plastics (OFRP) without requiring the replacement of multiple sets of equipment. Specifically, the guide structure of the inclined plate, during specimen clamping and pushing, simultaneously performs preliminary surface wear resistance testing through the relative wear between the specimen's sidewall and the anti-slip texture. The synchronous counter-rotating components on both sides enable torsional force testing, while synchronous unidirectional rotation allows for changing the test surface to achieve multi-faceted compression testing. The stabilizing plate is specifically designed for horizontal tensile strength testing, and works with the clamping plate to achieve tensile clamping. This integrated design significantly reduces equipment investment costs, simplifies the testing process, and improves testing efficiency.

[0017] The inclined plates at the ends of the clamping plate form a guide structure, which facilitates the rapid and accurate insertion of the specimen into the clamping slot, improving clamping efficiency. With the fixed rotating components on both sides, it can realize two rotation modes: same direction and opposite direction. Synchronous same direction rotation can change the test surface of the specimen to realize multi-face compression test; synchronous opposite rotation can apply torsional force to the specimen to realize torsional force test, which can simulate the complex stress posture of ultra-high performance concrete mixed with directional fiber in actual service. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the mechanical property testing device for ultra-high performance concrete with oriented fibers according to the present invention.

[0019] Figure 2 This is a partial structural diagram of the present invention;

[0020] Figure 3 This is a front cross-sectional view of the present invention;

[0021] Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle;

[0022] Figure 5 This is a schematic diagram of the pressure plate structure.

[0023] In the diagram, the components are: base-1, base plate-2, ring frame-3, fixed frame-4, first motor-5, clamping plate-6, fixed seat-7, first telescopic cylinder-8, support plate-9, limit block-10, inclined plate-11, fixed opening-12, stabilizing plate-13, support-14, guide rod-15, double-acting screw-16, guide wheel-17, gear ring-18, frame-19, second telescopic cylinder-20, pressure plate-21, pressure block-22, slot-23, clip-24, handle-25, and support assembly-26. Detailed Implementation

[0024] 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.

[0025] like Figures 1 to 5 As shown, a mechanical property testing device for ultra-high performance concrete with oriented fiber admixture includes a base 1, on which a power mechanism is mounted. Fixed rotating components are movably mounted on both sides of the power mechanism, and the power mechanism drives the fixed rotating components on both sides to move synchronously in opposite directions. A support component 26 is mounted at the top center of the base 1, and a loading component is mounted above the support component 26. The specimen is loaded between the fixed rotating components on both sides. The support component 26 is used to support the specimen and can change the form of the support surface according to the testing requirements. The loading component is located on the upper side of the specimen to apply vertical pressure to the specimen.

[0026] The fixed rotating assembly includes a base 2, an annular frame 3, and a fixed frame 4. The base 2 is slidably mounted on the power mechanism. An arc-shaped groove is provided at the top of the base 2. The annular frame 3 is slidably mounted in the arc-shaped groove. A first motor 5 is provided on the base 2 to drive the annular frame 3 to rotate along its own axis, so that the annular frames 3 on both sides can rotate in any posture according to the test requirements. The fixed frame 4 is fixedly connected to the middle of the annular frame 3 by several lateral support rods. Several clamping plates 6 are provided on the end face of the fixed frame 4 near the support assembly 26. Each clamping plate 6 surrounds to form a clamping groove for clamping the specimen.

[0027] In this embodiment, the support assembly 26 includes a fixed base 7 and a plurality of first telescopic cylinders 8 disposed in the fixed base 7. The plurality of first telescopic cylinders 8 are arranged along the length direction of the fixed base 7. A support plate 9 is provided at the end of the piston rod of the first telescopic cylinder 8. Limiting blocks 10 are respectively provided on the front and rear sides of the top of the support plate 9, so that the corresponding first telescopic cylinder 8 can be selectively driven to act according to the test conditions to form a suitable support surface.

[0028] When the piston rod of the first telescopic cylinder 8 extends, it drives the support plate 9 to rise. Multiple support plates 9 work together to form a support surface that adapts to the test requirements of the specimen (such as three-point support or four-point support). When support at a certain position is not needed, the piston rod of the corresponding first telescopic cylinder 8 retracts, driving the support plate 9 to descend and detach from the bottom of the specimen. This allows for flexible adjustment of the number, position, and span of the support surface to adapt to specimens of different sizes and test types.

[0029] The limiting blocks 10 on the front and rear sides of the top of the support plate 9 are used to limit the front and rear displacement of the specimen during the test, so as to prevent the specimen from shifting back and forth due to the loading force or its own weight, and ensure that the specimen is always in the correct test position.

[0030] The support plate 9 has a stress transmission cavity inside, which is filled with a flexible force transmission medium. The upper end face of the support plate 9 has a force transmission hole that communicates with the stress transmission cavity. The stress transmission cavity inside the support plate 9 is filled with a flexible force transmission medium (such as flexible silicone, elastic resin, etc.). When the first telescopic cylinder 8 pushes the support plate 9 to support the specimen, the reaction force exerted by the specimen on the support plate 9 will be transmitted to the flexible force transmission medium. The flexible force transmission medium has good force transmission and fluidity, which can evenly distribute the locally concentrated pressure to the entire upper end face of the support plate 9, and then transmit the uniform support force to the bottom of the specimen through the force transmission hole on the upper end face of the support plate 9.

[0031] This design can prevent stress concentration in the local area where the support plate 9 contacts the specimen, which could lead to damage such as crushing and cracking at the bottom of the specimen. At the same time, it ensures that the bottom of the specimen is subjected to uniform force, which is essential for bending, compressive strength and other tests.

[0032] The fixed base 7 is equipped with multi-segment independently driven guide rails, each segment of which corresponds to a set of first telescopic cylinders 8. Each segment of the guide rail can move independently along the length of the fixed base 7. Similarly, the support 14 also features multi-segment independently driven guide rails, each segment corresponding to a set of first telescopic cylinders 8. These guide rails can move independently along the length of the support 14, further enhancing the flexibility and accuracy of the support surface adjustment. During operation, based on the specimen size and test span requirements, the corresponding guide rails can be driven to move, causing the first telescopic cylinders 8 on them to move synchronously, thereby adjusting the spacing between adjacent support plates 9. This allows for adjustment of the support surface for different spans without disassembling or replacing the first telescopic cylinders 8.

[0033] For example, when performing a four-point bending test, two sets of guide rails can be moved to make the corresponding two support plates 9 symmetrically distributed to form four-point support; when performing a three-point bending test, the guide rails can be moved to adjust the position of the support plates 9 to form three-point support, which greatly improves the versatility of the device, reduces the time for tooling change, and improves testing efficiency.

[0034] In this embodiment, the clamping plate 6 is made of metal; the end face of the clamping plate 6 away from the fixing frame 4 is provided with an inclined plate 11, and the inclined plates 11 enclose a guide structure that gradually decreases from the outside to the inside; the inner surface of the inclined plate 11 is provided with teeth.

[0035] Multiple inclined plates 11 enclose a guide structure that gradually decreases in size from the outside to the inside. This guide structure plays a guiding role when the specimen is clamped, making it easier to quickly and accurately send both ends of the specimen into the clamping groove, avoiding deviation or jamming during specimen clamping, and improving clamping efficiency.

[0036] The serrations on the inner surface of the inclined plate 11 increase the friction between the inclined plate 11 and the specimen. This friction has a dual function: first, when the clamping groove clamps the specimen, the anti-slip texture can effectively prevent the specimen from sliding axially or circumferentially during the test (especially during loading and rotation), ensuring that the specimen is always in the correct clamping position and avoiding test errors caused by slippage, while reducing relative frictional damage between the specimen end and the clamping plate 6; second, during the process of clamping the specimen and guiding it into the clamping groove through the inclined plate 11, the side wall of the specimen rubs against the serrations on the inner surface of the inclined plate 11, which can simultaneously conduct preliminary testing on the surface wear resistance of the ultra-high performance concrete specimen mixed with oriented fibers, without the need for additional wear resistance testing fixtures.

[0037] The fixing frame 4 has a fixing port 12 in the middle that communicates with the clamping groove. Each side wall of the fixing port 12 is hinged with a stabilizing plate 13. The stabilizing plate 13 is inclined outward and connected to the fixing port 12 by a torsion spring. The clamping plates 6 are connected as a whole near the end of the fixing frame 4, which can enhance the overall structural strength of the clamping plates 6, prevent individual clamping plates 6 from deforming due to excessive force, and ensure the shape stability of the clamping groove. The fixing port 12 in the middle of the fixing frame 4 is connected to the clamping groove. The stabilizing plate 13 is only used for the horizontal tensile test of the specimen. During routine tests (such as compression and bending), the specimen is only clamped in the clamping groove and does not enter the fixing port 12 or contact the stabilizing plate 13. When the horizontal tensile test is performed, the two bases 2 continue to move inward, pushing the side end of the specimen further into the fixing port 12. The specimen squeezes the stabilizing plate 13 hinged to the side wall of the fixing port 12, causing the stabilizing plate 13 to rotate inward around the hinge point. At the same time, the torsion spring is compressed, generating a reverse elastic force, which pushes the stabilizing plate 13 to tightly clamp the side wall of the specimen, realizing the tensile clamping and positioning of the specimen.

[0038] This structure is specifically designed for horizontal tensile testing. When the specimen is held in place by the stabilizing plate 13, the two bases 2 move outward synchronously, applying a horizontal tensile force to the specimen, thereby completing the horizontal tensile test. This structure, together with the clamping force of the clamping plate 6, ensures that the specimen is firmly clamped during the tensile test, without slippage or loosening. It is especially suitable for tensile clamping of slender specimens or specimens with irregular cross-sections. At the same time, the elastic effect of the torsion spring can prevent the stabilizing plate 13 from causing rigid compression damage to the side wall of the specimen, thus balancing clamping stability and specimen protection. It does not affect the normal clamping and testing of the specimen during routine testing.

[0039] In this embodiment, the power mechanism includes supports 14 disposed on the left and right sides of the base 1. A guide rod 15 and a bidirectional lead screw 16 are connected between the two supports 14. The bidirectional lead screw 16 is driven to rotate by a second motor. One side of the base 2 is slidably connected to the guide rod 15, and the other side is threadedly connected to the bidirectional lead screw 16. The bidirectional lead screw 16 adopts a bidirectional thread design, which can realize the synchronous reverse movement of the two bases 2: when the bidirectional lead screw 16 rotates in the forward direction, the two bases 2 move closer to each other, driving the fixed rotating assembly to move closer to the specimen, realizing specimen clamping; when the bidirectional lead screw 16 rotates in the reverse direction, the two bases 2 move away from each other, driving the fixed rotating assembly to disengage from the specimen, realizing specimen unloading.

[0040] In this embodiment, several guide wheels 17 are provided at both ends of the arc-shaped slide, and the guide wheels 17 abut against the arc-shaped frame; a gear ring 18 is sleeved on the outer end of the ring frame 3, and a gear meshing with it is provided on the output shaft of the first motor 5; this can limit the ring frame 3 and prevent the ring frame 3 from tilting or shifting during rotation; when the first motor 5 is working, the output shaft drives the gear to rotate, and the gear drives the gear ring 18 to rotate synchronously, thereby driving the ring frame 3 to rotate around its own axis along the arc-shaped slide.

[0041] The loading assembly includes a frame 19, a second telescopic cylinder 20, and a pressure plate 21. The frame 19 is mounted on the upper side of the base 1. The second telescopic cylinder 20 is fixed to the frame 19, and the piston rod of the second telescopic cylinder 20 extends through the frame 19 to its lower side. The pressure plate 21 is disposed on the first telescopic cylinder 8, and the two are connected by a universal ball joint. The universal ball joint can realize multi-directional micro-deflection of the pressure plate 21. When the surface of the specimen is uneven or there is a slight tilt in the clamping, the pressure plate 21 can adaptively adjust its posture through the universal ball joint to ensure that the pressure block 22 makes full and uniform contact with the upper surface of the specimen, avoiding the concentration of loading force in a local area of ​​the specimen, which may lead to local crushing of the specimen or deviation of test data.

[0042] The pressure plate 21 is detachably mounted with a pressure block 22. Several slots 23 are formed on the bottom surface of the pressure plate 21, and a corresponding retaining strip 24 is provided on the top surface of the pressure block 22. A handle 25 is provided at the front end of the retaining strip 24. The pressure plate 21 and the pressure block 22 are detachably connected. The slots 23 on the bottom surface of the pressure plate 21 cooperate with the retaining strip 24 on the top surface of the pressure block 22, enabling quick installation and removal of the pressure block 22. The handle 25 at the front end of the retaining strip 24 facilitates the operator's gripping of the pressure block 22, allowing for easy replacement of pressure blocks 22 of different shapes and sizes according to different testing requirements (such as compression and splitting tests) without disassembling the entire pressure plate 21, thus improving testing efficiency and device versatility.

[0043] The working principle of this embodiment is as follows:

[0044] Start the second motor to drive the bidirectional lead screw 16 to rotate. The bidirectional lead screw 16 drives the bases 2 on both sides to move synchronously in opposite directions along the guide rod 15, so that the distance between the fixed rotating components on both sides is slightly larger than the length of the specimen, making it easier to put the specimen in.

[0045] All the support plates 9 of the support assembly 26 rise to form a large support surface, and the specimen is placed horizontally on it. The two ends of the specimen are aligned with the guide structure of the clamping groove. At the same time, the pressure block 22 descends to apply a slight downward pressure to the specimen to fix it.

[0046] During routine testing, the second motor is started again to drive the bidirectional lead screw 16 to rotate in the forward direction, so that the two bases 2 on both sides move closer to each other, causing the clamping plate 6 to gradually clamp the specimen until the clamping plate 6 is tightly attached to the end face of the specimen; then the second motor is stopped to complete the specimen clamping and positioning.

[0047] According to the test conditions (such as single-point support, three-point bending, and planar compression), the first telescopic cylinder 8 at the corresponding position is activated, causing the piston rod of the first telescopic cylinder 8 to descend, which in turn drives the support plate 9 to descend and reset until the flexible support surface on the upper end of the support plate 9 is in contact with the bottom of the specimen. The limiting block 10 is aligned with the front and rear sides of the specimen to limit the front and rear displacement of the specimen.

[0048] During the test, the second telescopic cylinder 20 is activated, and the piston rod of the second telescopic cylinder 20 slowly extends downward, pushing the pressure plate 21 and the pressure block 22 to move downward, applying vertical pressure to the specimen;

[0049] In addition, the rotation mode can be adjusted according to the test requirements. If it is necessary to change the test surface of the specimen to carry out multi-face pressure test, start the first motor 5 on the two bases 2 to control the two ring frames 3 to rotate synchronously in the same direction. The ring frame 3 drives the fixed frame 4 and the specimen to rotate synchronously in the same direction.

[0050] If the torsional resistance of the specimen needs to be tested, the first telescopic cylinder 8 and the second telescopic cylinder 20 are both reset, and then the two ring frames 3 on both sides are controlled to rotate synchronously in opposite directions, driving the two ends of the specimen to rotate synchronously in opposite directions, and applying torsional force to the specimen.

[0051] During this process, the rotational posture of the specimen is observed. By controlling the start, stop and speed of the first motor 5, the rotation angle of the two annular frames 3 is adjusted (synchronous rotation in the same direction is adjusted to the preset test surface, and synchronous rotation in the opposite direction is adjusted to the preset torsion angle), so that the specimen is in the preset test posture.

[0052] During the testing process, test data is collected in real time (conventional tests collect loading pressure, specimen deformation, etc.; tensile tests collect horizontal tension, specimen elongation, etc.; wear resistance tests collect wear loss and wear coefficient during the guiding process; torsion tests collect torsional torque and torsion angle, etc.), which can be achieved through external acquisition equipment; observe the stress state of the specimen. Conventional tests focus on monitoring whether the specimen has cracks, slippage, loosening, etc.; tensile tests focus on monitoring the clamping state of the stabilizing plate 13 and whether the specimen has tensile fracture, slippage, etc.; wear resistance tests focus on observing the surface wear degree of the specimen and the wear of the anti-slip texture during the guiding wear process; torsion tests focus on monitoring the torsion state of the specimen and whether torsional fracture, slippage, etc.

[0053] 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 testing device for the mechanical properties of ultra-high performance concrete mixed with directional fibers, characterized in that: The device includes a base on which a power mechanism is mounted. Fixed rotating components are movably mounted on both sides of the power mechanism, and the power mechanism drives the fixed rotating components on both sides to move synchronously in opposite directions. A support component is mounted at the top center of the base, and a loading component is mounted above the support component. The specimen is loaded between the two fixed rotating components. The support component is used to support the specimen and can change the form of the support surface according to the test requirements. The loading component is located on the upper side of the specimen to apply vertical pressure to the specimen. The fixed rotation assembly includes a base, an annular frame, and a fixed frame. The base is slidably mounted on a power mechanism. An arc-shaped groove is provided at the top of the base. The annular frame is slidably mounted in the arc-shaped groove. A first motor is provided on the base to drive the annular frame to rotate along its own axis, so that the annular frames on both sides can rotate in any posture according to the test requirements. The fixed frame is fixed to the middle of the annular frame by several lateral support rods. Several clamping plates are provided on the end face of the fixed frame near the support assembly. The clamping plates form a clamping groove for clamping the specimen. The support assembly includes a fixed base and a plurality of first telescopic cylinders disposed within the fixed base. The plurality of first telescopic cylinders are arranged along the length direction of the fixed base. A support plate is provided at the end of the piston rod of each first telescopic cylinder. Limit blocks are respectively provided on the front and rear sides of the top of the support plate, thereby selectively driving the corresponding first telescopic cylinder to act according to the test conditions to form a suitable support surface. A stress transmission cavity is provided inside the support plate, and the stress transmission cavity is filled with a flexible force transmission medium. A force transmission hole communicating with the stress transmission cavity is opened on the upper surface of the support plate. During operation, the first telescopic cylinders push... The support plate supports the specimen, and the flexible force transmission medium evenly distributes the pressure to the entire support plate, making the support surface uniformly stressed. The clamping plate is made of metal. The end face of the clamping plate away from the fixed frame is provided with an inclined plate, and the inclined plates form a guide structure that gradually decreases in size from the outside to the inside. The inner surface of the inclined plate is provided with teeth. The ends of the clamping plates near the fixed frame are connected as one unit. The middle of the fixed frame is provided with a fixing port that communicates with the clamping groove. Each side wall of the fixing port is hinged with a stabilizing plate. The stabilizing plate is inclined outward and connected to the fixing port with a torsion spring.

2. The mechanical property testing device for ultra-high performance concrete with oriented fiber admixture according to claim 1, characterized in that: The fixed base is equipped with multi-segment independent drive guide rails, each segment of the guide rail corresponds to a set of first telescopic cylinders, and each segment of the guide rail moves independently along the length direction of the fixed base.

3. The mechanical property testing device for ultra-high performance concrete with oriented fiber admixture according to claim 1, characterized in that: The power mechanism includes supports on the left and right sides of the base, with a guide rod and a bidirectional lead screw connected between the two supports. The bidirectional lead screw is driven to rotate by a second motor. One side of the base is slidably connected to the guide rod, and the other side is threadedly connected to the bidirectional lead screw.

4. The mechanical property testing device for ultra-high performance concrete with oriented fiber admixture according to claim 1, characterized in that: Several guide wheels are provided at both ends of the arc-shaped slide, and the guide wheels abut against the arc-shaped frame; a gear ring is sleeved on the outer end of the ring frame, and a gear meshing with it is provided on the output shaft of the first motor.

5. The mechanical property testing device for ultra-high performance concrete with oriented fiber admixture according to claim 1, characterized in that: The loading assembly includes a frame, a second telescopic cylinder, and a pressure plate. The frame is mounted on the upper side of the base. The second telescopic cylinder is fixed to the frame, and its piston rod extends through the frame to its lower side. The pressure plate is mounted on the first telescopic cylinder, and the two are connected by a universal ball joint. The pressure plate is detachably mounted with a pressure block. The bottom surface of the pressure plate has several slots, and the top surface of the pressure block has corresponding locking strips, with a handle at the front end of each locking strip.

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