Anchorage cable steel strand relaxation experimental device capable of offsetting bench micro-deformation

Abstract

This invention provides an anchor cable strand relaxation test device that can counteract micro-deformation of the test bench, belonging to the technical field of building material testing equipment. It includes a test bench, a tensile testing machine, an end plate, a limiting component, a deformation transmission frame, and a drive mechanism. The test bench is installed on the ground, and the tensile testing machine is slidably connected to it, having a first through hole. The end plate is slidably connected to the test bench, having a second through hole. The limiting component is installed at the other end of the steel strand. The deformation transmission frame is installed on the test bench, with pressure sensors at both ends. The two pressure sensors respectively abut against the tensile testing machine and the end plate. The drive mechanism drives the tensile testing machine and the end plate to move. This invention provides a test device that uses pressure sensors to detect the pressure applied by the tensile testing machine and the end plate, thereby using the drive mechanism to control the movement of the tensile testing machine and the end plate, thus counteracting micro-deformation of the test device and ensuring the accuracy of the experimental results.

Description

Technical Field

[0001] This invention belongs to the technical field of building material testing equipment, specifically relating to an anchor cable strand relaxation test device that can compensate for micro-deformation of the test bench. Background Technology

[0002] Steel strand is a crucial material in prestressed concrete engineering construction, and its quality must be inspected before construction. The steel strand stress relaxation testing apparatus is an instrument for testing the stress in steel strands. Many factors influence the experiment, but the impact of minute deformations of the testing equipment frame on the stress relaxation test results is often overlooked. The steel strand stress relaxation test requires 1000 hours of testing time. Under prolonged stress, the steel strand undergoes stress relaxation, inevitably leading to minute deformations between the tensile testing machine and the fixing frame holding the steel strand, thus affecting the accuracy of the test results. Summary of the Invention

[0003] This invention provides an anchor cable strand relaxation test device that can offset the micro-deformation of the test bench, thereby solving the technical problem in the prior art where the frame undergoes micro-deformation under long-term stress, affecting the accuracy of the test results.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: to provide an anchor cable strand relaxation test device that can compensate for micro-deformation of the test bench, comprising:

[0005] The experimental platform is installed on the ground.

[0006] A tensile testing machine is mounted on the test bench and slidably connected to the test bench; the tensile testing machine has a first through hole for one end of a steel strand to pass through;

[0007] An end plate is installed on the test bench and is arranged parallel to and spaced apart from the tensile testing machine. The end plate is slidably connected to the test bench, and the end plate has a second through hole for the other end of the steel strand to pass through.

[0008] A limiting member is installed at the other end of the steel strand to limit the steel strand to be located on the end plate;

[0009] A deformation transfer frame is installed on the experimental platform and located between the tensile testing machine and the end plate; pressure sensors are provided at both ends of the deformation transfer frame, and the two pressure sensors respectively abut against the tensile testing machine and the end plate;

[0010] A drive mechanism, connected to the tensile testing machine and the end plate, is used to drive the tensile testing machine and the end plate to move.

[0011] In one possible implementation, the deformation transmission frame includes a vertical rod mounted on the test bench and a horizontal rod mounted on the upper end of the vertical rod, with both ends of the horizontal rod extending toward the tensile testing machine and the end plate, respectively; two pressure sensors are respectively fixedly mounted on both ends of the horizontal rod.

[0012] In one possible implementation, the pressure sensor is a ring structure, with the two ends of the tensioned steel strand passing through the two pressure sensors respectively.

[0013] In one possible implementation, the drive mechanism consists of two sets, which are respectively connected to the tensile testing machine and the end plate; the drive mechanism includes a drive motor and a first gear mounted on the upper part of the test bench, and the lower ends of the tensile testing machine and the end plate are each provided with a first rack that meshes with the corresponding first gear.

[0014] In one possible implementation, the test bench is further provided with an inverted U-shaped frame, and the tensile testing machine and the end plate are installed inside the U-shaped frame; the top of the U-shaped frame is also provided with two sets of second gears, and the upper ends of the tensile testing machine and the end plate are each provided with a second rack that meshes with the corresponding second gear; the side of the U-shaped frame is also provided with mounting holes for installing steel strands.

[0015] In one possible implementation, there are multiple first gears in the same group of drive mechanisms, and adjacent first gears are arranged alternately.

[0016] In one possible implementation, both the experimental platform and the U-shaped frame are equipped with slide rails, and both the tensile testing machine and the end plate are equipped with sliding components that are slidably fitted to the corresponding slide rails.

[0017] In one possible implementation, the sliding member includes a connecting plate and two sliding plates respectively mounted on both sides of the connecting plate. The connecting plate is fixedly connected to the tensile testing machine and the end plate, and the sliding plates are slidably connected to the slide rail. The first rack and the second rack are respectively disposed on the corresponding connecting plates and located between the two sliding plates.

[0018] In one possible implementation, the anchor cable strand relaxation test device that can offset the micro-deformation of the test bench further includes a pressure value sensor and a controller. The pressure value sensor is used to detect the tensile force on the steel strand. The pressure value sensor is installed at the end of the end plate away from the tensile testing machine, and the pressure value sensor is located between the end plate and the limiting member. The pressure value sensor is electrically connected to the controller.

[0019] In one possible implementation, the tensile testing machine further includes a control button and a display screen. The control button is connected to the drive mechanism and is used to control the movement of the tensile testing machine and the end plate. The display screen and the pressure sensor are electrically connected to the controller. The display screen is used to display the force data of the pressure sensor and the pressure value sensor.

[0020] The beneficial effects of the anchor cable strand relaxation test device provided by this invention, which can compensate for the micro-deformation of the test bench, are as follows: Compared with the prior art, in use, one end of the steel strand passes through the second through hole of the end plate and then sequentially through two pressure sensors at both ends of the deformation transmission frame, so that one end of the steel strand passes through the first through hole and connects to the tensile testing machine. After the connection is completed, the other end of the steel strand is fixed to the end plate by a limiting component. The tensile testing machine is started, and it is checked and ensured that the two pressure testers only contact the side of the tensile testing machine and the side of the end plate without being subjected to pressure. The experiment begins, and the tensile testing machine applies tension to the steel strand. At this time, the tensile testing machine itself is stationary. When the steel strand is subjected to tension, the test device will deform as the experiment progresses, that is, due to the steel strand... When a line is subjected to tension for an extended period, stress relaxation occurs, causing the straight-line distance between the tensile testing machine and the end plate to shorten. This puts pressure on the pressure sensor on the deformation transfer frame. At this point, the drive mechanism is activated, controlling the tensile testing machine and the end plate to move away from the deformation transfer frame, restoring the straight-line distance between them to its pre-experimental state. Once the pressure sensor is in contact with the tensile testing machine and the end plate but is no longer under pressure, the drive mechanism is deactivated to ensure the experiment can proceed normally. Adjustments are made again once the experimental setup deforms again. In this way, by using pressure sensors to detect the pressure applied by the tensile testing machine and the end plate, and then using the drive mechanism to control the movement of the tensile testing machine and the end plate, the micro-deformation of the experimental setup can be counteracted, ensuring the accuracy of the experimental results. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the anchor cable strand relaxation test device that can compensate for the micro-deformation of the test bench provided in an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram showing the connection between the experimental platform and the drive mechanism provided in an embodiment of the present invention;

[0024] Figure 3This is a schematic diagram showing the connection between the tensile testing machine and the sliding component provided in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection between the end plate and the sliding member provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the connection between the drive motor and the drive gear provided in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the deformation transmission frame provided in an embodiment of the present invention.

[0028] The following are the labeling elements in the figure:

[0029] 1. Experimental platform; 11. Pressure numerical sensor; 2. Tensile testing machine; 21. First through hole; 22. U-shaped frame; 23. Second gear; 24. Second rack; 25. Mounting hole; 26. Control button; 27. Display screen; 3. End plate; 4. Limiting component; 5. Deformation transmission frame; 51. Pressure sensor; 52. Vertical rod; 53. Horizontal rod; 6. Drive mechanism; 61. First gear; 62. First rack; 63. Drive motor; 7. Slide rail; 8. Sliding component; 81. Connecting plate; 82. Slide plate; 9. Steel strand. Detailed Implementation

[0030] To make the technical problems, solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0032] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] Please see Figures 1 to 6 The present invention will now describe the anchor cable strand relaxation test device that can offset the micro-deformation of the test bench. An anchor cable strand relaxation test device that can offset the micro-deformation of the test bench includes a test bench 1, a tensile testing machine 2, an end plate 3, a limiting member 4, a deformation transmission frame 5, and a driving mechanism 6. The test bench 1 is installed on the ground, and the tensile testing machine 2 is installed on the test bench 1 and slidably connected to it. The tensile testing machine 2 has a first through hole 21 for one end of the steel strand 9 to pass through. The end plate 3 is installed on the test bench 1 and is parallel and spaced apart from the tensile testing machine 2. The end plate 3 is slidably connected to the test bench 1. The end plate 3 has a second through hole for the other end of the steel strand 9 to pass through. The limiting member 4 is installed at the other end of the steel strand 9 to limit the steel strand 9 to be located on the end plate 3. The deformation transmission frame 5 is installed on the test bench 1 and is located between the tensile testing machine 2 and the end plate 3. Both ends of the deformation transmission frame 5 are equipped with pressure sensors 51. The two pressure sensors 51 are respectively abutted against the tensile testing machine 2 and the end plate 3. The driving mechanism 6 is connected to the tensile testing machine 2 and the end plate 3 to drive the tensile testing machine 2 and the end plate 3 to move.

[0035] The anchor cable strand relaxation test device provided in this embodiment, which can compensate for the micro-deformation of the test bench, compared with the prior art, involves passing one end of the steel strand 9 through the second through hole of the end plate 3 and sequentially through the two pressure sensors 51 at both ends of the deformation transmission frame 5, so that one end of the steel strand 9 is inserted into the first through hole 21 and connected to the tensile testing machine 2. After the connection is completed, the other end of the steel strand 9 is fixed on the end plate 3 by the limiting member 4. The tensile testing machine 2 is started, and it is checked and ensured that the two pressure sensors 51 only contact the side of the tensile testing machine 2 and the side of the end plate 3 without being subjected to pressure. The experiment begins, and the tensile testing machine 2 applies tension to the steel strand 9. At this time, the tensile testing machine 2 itself does not move. When the steel strand 9 is subjected to tension, the test device will deform as the experiment progresses, that is, due to the steel strand 9 being subjected to tension for a long time, deformation occurs. Stress relaxation causes the straight-line distance between the tensile testing machine 2 and the end plate 3 to shorten, thus putting pressure on the pressure sensor 51 on the deformation transmission frame 5. At this time, the drive mechanism 6 is activated, which controls the tensile testing machine 2 and the end plate 3 to move away from the deformation transmission frame 5, restoring the straight-line distance between the tensile testing machine 2 and the end plate 3 to the distance before the experiment. When the pressure sensor 51 is in contact with the tensile testing machine 2 and the end plate 3 and is no longer under pressure, the drive mechanism 6 is turned off to ensure the normal progress of the experiment. Adjustments are made again after the experimental device deforms again. In this way, the pressure sensor 51 detects the pressure applied by the tensile testing machine 2 and the end plate 3, and the drive mechanism 6 controls the movement of the tensile testing machine 2 and the end plate 3, thereby counteracting the micro-deformation of the experimental device and ensuring the accuracy of the experimental results.

[0036] Please see Figure 1 and Figure 6As a specific embodiment of the anchor cable strand relaxation test device that can compensate for the micro-deformation of the test bench provided by the present invention, the deformation transmission frame 5 includes a vertical rod 52 installed on the test bench 1 and a horizontal rod 53 installed on the upper end of the vertical rod 52. The two ends of the horizontal rod 53 extend toward the tensile testing machine 2 and the end plate 3, respectively. Two pressure sensors 51 are fixedly installed at both ends of the horizontal rod 53. The lower end of the vertical rod 52 is fixedly connected to the upper surface of the test bench 1, and the horizontal rod 53 is fixedly connected to the vertical rod 52, so that the vertical rod 52 supports the horizontal rod 53, thereby aligning the pressure sensors 51 with the centers of the tensile testing machine 2 and the end plate 3, respectively, to ensure the accuracy of the experimental results. The two pressure sensors 51 are fixedly installed on the horizontal rod 53. The two ends are positioned so that the two pressure sensors 51 are in contact with the sides of the tensile testing machine 2 and the end plate 3 respectively, and the pressure sensors 51 are kept free from pressure. During the experiment, due to the long-term experiment, the steel strand 9 will experience stress relaxation. When the tensile testing machine 2 tightens the steel strand 9 through the first through hole 21, the straight distance between the tensile testing machine 2 and the end plate 3 will become shorter, thus putting pressure on the pressure sensors 51. At this time, the drive mechanism 6 is activated, and the tensile testing machine 2 and the end plate 3 are moved away from the deformation transmission frame 5. The positions of the two are finely adjusted until the pressure sensors 51 are in contact with the tensile testing machine 2 and the end plate 3 and are no longer under pressure, so as to ensure the accuracy of the experimental results.

[0037] Please see Figures 1 to 5 As a specific embodiment of the anchor cable strand relaxation test device that can offset the micro deformation of the test bench provided by the present invention, the pressure sensor 51 is a ring structure, and the two ends of the tensioned steel strand 9 pass through the two pressure sensors 51 respectively; the pressure sensor 51 is set as a ring structure, which makes it easy for the steel strand 9 to pass through it and does not affect the test results; at the same time, when the ring structure pressure sensor 51 is subjected to pressure, it can uniformly sense the small deformations generated by the tensile testing machine 2 and the end plate 3 from various places.

[0038] Please see Figures 1 to 5As a specific embodiment of the anchor cable strand relaxation test device that can offset the micro-deformation of the test bench provided by the present invention, the drive mechanism 6 consists of two sets, which are respectively connected to the tensile testing machine 2 and the end plate 3. The drive mechanism 6 includes a drive motor 63 and a first gear 61 installed on the upper end of the test bench 1. The lower ends of the tensile testing machine 2 and the end plate 3 are provided with a first rack 62 that meshes with the corresponding first gear 61. The upper surface of the test bench 1 is provided with multiple receiving slots for accommodating the drive mechanism 6. The drive motor 63 and the first gear 61 are both installed in the receiving slots. When it is necessary to make fine adjustments to the deformed test device, the drive mechanism 6 is started, and the drive motor 63 located in the receiving slot starts to rotate, driving the first gear 61 to rotate. Since the first gear 61 meshes with the first rack 62, and the first rack 62 is fixedly connected to the lower end surface of the tensile testing machine 2 and the lower end surface of the end plate 3, the drive mechanism 6 can be used to control the tensile testing machine 2 and the end plate 3 to move away from the deformation transmission frame 5, ensuring that the pressure sensor 51 is not subjected to pressure.

[0039] Please see Figure 1 and Figure 2 As a specific embodiment of the anchor cable strand relaxation test device that can offset the micro-deformation of the test bench provided by the present invention, the test bench 1 is also provided with an inverted U-shaped frame 22, and the tensile testing machine 2 and the end plate 3 are installed in the U-shaped frame 22; the top of the U-shaped frame 22 is also provided with two sets of second gears 23, and the upper ends of the tensile testing machine 2 and the end plate 3 are both provided with second racks 24 that mesh with the corresponding second gears 23; the side of the U-shaped frame 22 is also provided with mounting holes 25 for installing steel strands 9; the inverted U-shaped frame 22 is fixed on the test bench 1, and the tensile testing machine 2 and the end plate 3 are placed between the test bench 1 and the U-shaped frame 22. By means of the upper and lower ends of the tensile testing machine 2 and the end plate 3 being slidably connected to the test bench 1 and the U-shaped frame 22 respectively, the movement of the tensile testing machine 2 and the end plate 3 is more... Stability; mounting holes 25 are opened on the side of the U-shaped frame 22 near the end plate 3 to ensure that the steel strand 9 can pass through the U-shaped frame 22 and connect to the tensile testing machine 2, ensuring the normal operation of the experiment; multiple receiving holes are opened on the side of the U-shaped frame 22 opposite to the test table 1, and the second gear 23 is set in the receiving holes, so that the second gear 23 is rotatably connected to the receiving holes, and the second rack 24 is fixedly connected to the upper end face of the tensile testing machine 2 and the end plate 3, making the movement of the tensile testing machine 2 and the end plate 3 more stable; a motor can also be installed in the receiving holes to drive the second rack 24 to rotate. The motor rotates synchronously with the drive motor 63, so that the tensile testing machine 2 and the end plate 3 are driven by forces in both the upper and lower directions during the movement, ensuring that the movement of the tensile testing machine 2 and the end plate 3 is more stable and reliable.

[0040] Please see Figure 1As a specific embodiment of the anchor cable strand relaxation test device that can offset the micro-deformation of the test bench provided by the present invention, there are multiple first gears 61 in the same group of drive mechanism 6, and adjacent first gears 61 are arranged alternately. There are multiple second gears 23 in the same group, and adjacent second gears 23 are arranged alternately. The first gears 61 and second gears 23 are respectively arranged alternately to apply driving force to the first rack 62 and second rack 24 from opposite directions. At the same time, the connection relationship between the first gear 61 and second rack 24 and the first gear 61 and second rack 24 is enhanced in a disguised way, thereby improving the motion stability of the first rack 62 and second rack 24, so as to ensure the motion stability of the tensile testing machine 2 and the end plate 3.

[0041] Please see Figures 2 to 4 As a specific embodiment of the anchor cable strand relaxation test device that can offset the micro-deformation of the test bench provided by the present invention, both the test bench 1 and the U-shaped frame 22 are equipped with slide rails 7, and both the tensile testing machine 2 and the end plate 3 are equipped with sliding members 8 that are slidably installed with the corresponding slide rails 7. Sliding members 8 are respectively set at the upper and lower ends of the tensile testing machine 2 and the end plate 3, and the first rack 62 and the second rack 24 are installed on the corresponding sliding members 8, so that the drive mechanism 6 can control the movement of the tensile testing machine 2 and the end plate 3 through the sliding members 8. The sliding members 8 are set so that the tensile testing machine 2 and the end plate 3 are slidably connected with the slide rails 7 of the test bench 1 and the U-shaped frame 22 respectively, ensuring that the tensile testing machine 2 and the end plate 3 only move along the direction of the slide rails 7, preventing the movement direction of the two from deviating, and ensuring the accuracy of the test results.

[0042] Please see Figure 3 and Figure 4 As a specific embodiment of the anchor cable strand relaxation test device that can offset the micro-deformation of the test bench provided by the present invention, the sliding member 8 includes a connecting plate 81 and two sliding plates 82 respectively installed on both sides of the connecting plate 81. The connecting plate 81 is fixedly connected to the tensile testing machine 2 and the end plate 3. The sliding plates 82 are slidably connected to the slide rail 7. The first rack 62 and the second rack 24 are respectively disposed on the corresponding connecting plates 81 and located between the two sliding plates 82. The sliding plate 82 is L-shaped. With the help of the connecting plate 81, the first rack 62 and the second rack 24 are connected to the tensile testing machine 2 and the end plate 3 respectively. At the same time, with the help of the L-shaped sliding plate 82, one end of it is fixed to the connecting plate 81, and the other end is engaged with the slide rail 7 and slidably connected to the slide rail 7. This allows the tensile testing machine 2 and the end plate 3 to move only along the direction of the slide rail 7, that is, only towards or away from the deformation transmission frame 5. This ensures that when the straight distance between the tensile testing machine 2 and the end plate 3 becomes shorter, the movement of the tensile testing machine 2 and the end plate 3 is controlled, thereby ensuring the accuracy of the experimental results.

[0043] Please see Figure 1 and Figure 4As a specific embodiment of the anchor cable strand relaxation test device that can offset the micro-deformation of the test bench provided by the present invention, the anchor cable strand relaxation test device further includes a pressure value sensor 11 and a controller. The pressure value sensor 11 is used to detect the tension on the steel strand 9. The pressure value sensor 11 is installed at the end of the end plate 3 away from the tensile testing machine 2, and the pressure value sensor 11 is located between the end plate 3 and the limiting member 4. The pressure value sensor 11 is electrically connected to the controller. When making small displacement adjustments to the tensile testing machine 2 and the end plate 3, if the tension of the tensile testing machine 2 on the steel strand 9 remains unchanged, it will cause the tension on the steel strand 9 to become unstable and undergo sudden changes, which will seriously affect the test. To ensure the accuracy of the test, a pressure sensor 11 and a controller are installed between the limiting component 4 and the end plate 3 to monitor the tension value on the steel strand 9 in real time. When the tensile testing machine 2 and the end plate 3 are displaced, the force on the steel strand 9 will increase instantaneously. To ensure that the tension on the steel strand 9 remains constant when the experimental instrument is adjusted for displacement, it is necessary to reduce the tension of the tensile testing machine 2 on the steel strand 9. Therefore, the pressure sensor 11 and the controller transmit the tension of the steel strand 9 in real time to ensure that the reduction of the tension of the tensile testing machine 2 on the steel strand 9 is neither too much nor too little. At the same time, the limiting component 4 is a single-hole anchor. The limiting component 4 is set on the side of the end plate 3 away from the tensile testing machine 2, which more securely fixes the steel strand 9 to the end plate 3.

[0044] Please see Figure 1 and Figure 3As a specific embodiment of the anchor cable strand relaxation test device that can offset the micro-deformation of the test bench provided by the present invention, the tensile testing machine 2 also includes a control button 26 and a display screen 27. The control button 26 is connected to the drive mechanism 6 and is used to control the movement of the tensile testing machine 2 and the end plate 3. The display screen 27 and the pressure sensor 51 are electrically connected to the controller. The display screen 27 is used to display the force data of the pressure sensor 51 and the pressure value sensor 11. Before the experiment starts, one end of the steel strand 9 is passed through the mounting hole 25 and then through the pressure value sensor 11, the second through hole, and the two pressure sensors 51 in sequence, so that one end of the steel strand 9 is connected to the tensile testing machine 2 through the first through hole 21. After the connection is completed, the limiting member 4 is installed to fix the other end of the steel strand 9 on the end plate 3. The tensile testing machine 2 is started, and the display screen 27 is used to observe whether the two pressure sensors 51 are in contact with the sides of the tensile testing machine 2 and the end plate 3 respectively and are not under pressure, to ensure pressure After the sensor 51 is no longer under pressure, the experiment begins. The tensile testing machine 2 applies tension to the steel strand 9 without moving itself. As the experiment progresses, the experimental device undergoes slight deformation, i.e., the steel strand 9 experiences stress relaxation. Under the action of the tensile testing machine 2, the straight-line distance between the tensile testing machine 2 and the end plate 3 shortens. When the experimental device undergoes slight deformation, the pressure sensor 51 is subjected to pressure and transmits the information to the tensile testing machine 2 through the controller, which is then displayed on the display screen 27. At this time, the drive mechanism 6 is operated by the control button 26. Through the meshing connection of the gear and rack, the tensile testing machine 2 and the end plate 3 are slightly displaced. The information transmitted by the pressure sensor 11 is observed through the display screen 27, and the moving speed of the tensile testing machine 2 and the end plate 3 is adjusted at any time to keep the tension on the steel strand 9 constant until the pressure sensor 51 is no longer under pressure from the tensile testing machine 2 and the end plate 3, thereby ensuring the accuracy of the experimental results.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A test apparatus for relaxing anchor cable strands to compensate for micro-deformation of a test bench, characterized in that, include: The experimental platform is installed on the ground. A tensile testing machine is mounted on the test bench and slidably connected to the test bench; the tensile testing machine has a first through hole for one end of a steel strand to pass through; An end plate is installed on the test bench and is arranged parallel to and spaced apart from the tensile testing machine. The end plate is slidably connected to the test bench, and the end plate has a second through hole for the other end of the steel strand to pass through. A limiting member is installed at the other end of the steel strand to limit the steel strand to be located on the end plate; A deformation transfer frame is installed on the experimental platform and located between the tensile testing machine and the end plate. Pressure sensors are provided at both ends of the deformation transfer frame, with the two pressure sensors respectively abutting against the tensile testing machine and the end plate. The deformation transfer frame includes a vertical rod installed on the experimental platform and a horizontal rod installed at the upper end of the vertical rod, with both ends of the horizontal rod extending towards the tensile testing machine and the end plate, respectively. The two pressure sensors are fixedly installed at both ends of the horizontal rod. A drive mechanism, connected to the tensile testing machine and the end plate, is used to drive the tensile testing machine and the end plate to move.

2. The anchor cable strand relaxation test device for compensating for micro-deformation of the test bench as described in claim 1, characterized in that, The pressure sensor has a ring structure, and the two ends of the taut steel strand pass through the two pressure sensors respectively.

3. The anchor cable strand relaxation test device for compensating for micro-deformation of the test bench as described in claim 1, characterized in that, The driving mechanism consists of two sets, which are respectively connected to the tensile testing machine and the end plate. The driving mechanism includes a drive motor and a first gear mounted on the upper part of the test bench. The lower ends of the tensile testing machine and the end plate are each provided with a first rack that meshes with the corresponding first gear.

4. The anchor cable strand relaxation test device for compensating for micro-deformation of the test bench as described in claim 3, characterized in that, The experimental platform is also equipped with an inverted U-shaped frame, in which the tensile testing machine and the end plate are installed; the top of the U-shaped frame is also equipped with two sets of second gears, and the upper ends of the tensile testing machine and the end plate are both equipped with second racks that mesh with the corresponding second gears; the side of the U-shaped frame is also equipped with mounting holes for installing steel strands.

5. The anchor cable strand relaxation test device for compensating for micro-deformation of the test bench as described in claim 3, characterized in that, The drive mechanism in the same group has multiple first gears, and adjacent first gears are arranged alternately.

6. The anchor cable strand relaxation test device for compensating for micro-deformation of the test bench as described in claim 4, characterized in that, Both the experimental platform and the U-shaped frame are equipped with slide rails, and both the tensile testing machine and the end plate are equipped with sliding components that are slidably installed with the corresponding slide rails.

7. The anchor cable strand relaxation test device for compensating for micro-deformation of the test bench as described in claim 6, characterized in that, The sliding component includes a connecting plate and two sliding plates respectively mounted on both sides of the connecting plate. The connecting plate is fixedly connected to the tensile testing machine and the end plate. The sliding plates are slidably connected to the slide rail. The first rack and the second rack are respectively disposed on the corresponding connecting plates and located between the two sliding plates.

8. The anchor cable strand relaxation test device for compensating for micro-deformation of the test bench as described in claim 1, characterized in that, The anchor cable strand relaxation test device that can offset the micro-deformation of the test bench further includes a pressure value sensor and a controller. The pressure value sensor is used to detect the tensile force on the steel strand. The pressure value sensor is installed at the end of the end plate away from the tensile testing machine and is located between the end plate and the limiting member. The pressure value sensor is electrically connected to the controller.

9. The anchor cable strand relaxation test device for compensating for micro-deformation of the test bench as described in claim 8, characterized in that, The tensile testing machine also includes control buttons and a display screen. The control buttons are connected to the drive mechanism and are used to control the movement of the tensile testing machine and the end plate. The display screen and the pressure sensor are electrically connected to the controller. The display screen is used to display the force data of the pressure sensor and the pressure value sensor.

Images