Static pressure penetration and horizontal loading integrated test device

Abstract

The invention discloses a static pressure penetration and horizontal loading integrated test device, and relates to the technical field of mechanical test equipment, the static pressure penetration and horizontal loading integrated test device comprises an experiment table, a transmission mechanism is arranged in the experiment table, the transmission mechanism comprises a first servo motor arranged in the experiment table, and the output end of the first servo motor is provided with a threaded rod; the side, away from the first servo motor, of the threaded rod is in threaded connection with a moving block, a model box is fixedly connected to the upper portion of the moving block, the transmission mechanism operates to enable the model box to be converted into a moving state from a static state, and a static pressure penetration mechanism is arranged above the experiment table and comprises a first frame arranged above the experiment table. The static pressure penetration mechanism and the horizontal loading mechanism are integrated on the same experiment table, and the transmission mechanism is arranged to realize automatic movement of the model box, so that the test efficiency is remarkably improved, and a worker does not need to manually move the model box, so that the waiting time is shortened, and the test process is smoother and more efficient.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical testing equipment, and in particular to a static pressure penetration and horizontal loading integrated testing device. Background Art

[0002] Pile foundation has become the most widely used foundation form in the field of offshore wind power engineering due to its advantages such as simple construction, good bearing capacity and strong applicability. However, the pile foundation of offshore wind turbines is often subjected to horizontal cyclic loads such as wind loads and wave loads during normal service. Therefore, great attention should be paid to the analysis of pile foundations under horizontal cyclic loads. Taking the offshore wind power pile foundation as the research object, a self-designed horizontal loading device was used to simulate the wave load, and a scaled model test was carried out in combination with particle image velocimetry (P IV) technology. The focus is on exploring the cyclic deformation characteristics of the soil around the pile during the loading process of wave loads of different amplitudes and the changes in the horizontal bearing capacity of the offshore wind turbine pile foundation before and after loading.

[0003] In the prior art, it is not possible to conduct a horizontal loading test immediately after a static pressure penetration test. Workers are required to manually move the model box to the horizontal loading test assembly, which results in a long waiting time. This makes the test process cumbersome and time-consuming, the degree of automatic integration is low, and the work efficiency is low. Therefore, an integrated test device for static pressure penetration and horizontal loading is proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that the horizontal loading test cannot be carried out immediately after the static pressure penetration test, and the staff needs to manually move the model box to the horizontal loading test component, which results in a long waiting time, resulting in a cumbersome and time-consuming test process, a low degree of automatic integration, and low work efficiency. A static pressure penetration and horizontal loading integrated test device is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The static pressure penetration and horizontal loading integrated test device comprises a test bench, a transmission mechanism is arranged inside the test bench, the transmission mechanism comprises a first servo motor arranged inside the test bench, a threaded rod is arranged at the output end of the first servo motor, a moving block is threadedly connected to a side of the threaded rod away from the first servo motor, a model box is fixedly connected to the top of the moving block, and the operation of the transmission mechanism causes the model box to change from a static state to a moving state;

[0007] A static pressure penetration mechanism is arranged above the experimental platform, and the static pressure penetration mechanism comprises a first frame arranged above the experimental platform, a loading beam is arranged inside the first frame, a force and displacement sensor is arranged below the loading beam, a connecting beam is fixedly connected to a side of the force and displacement sensor away from the loading beam, a first barrel base is arranged on a side of the connecting beam away from the force and displacement sensor, a horizontal loading mechanism is arranged above the experimental platform away from the first frame, and the horizontal loading mechanism comprises a second frame arranged above the experimental platform, the experimental platform and the second frame are fixedly connected, a second servo motor is fixedly installed above the second frame, a vertical lifter is arranged above the second frame, an electric push rod is arranged at the output end of the second servo motor, a connecting rod is arranged on a side of the electric push rod away from the second servo motor, and a second barrel base is arranged below the connecting rod;

[0008] The horizontal loading mechanism includes the DynamicTest dynamic measurement and control software, which mainly includes conventional loading (static load) and general fatigue loading (cyclic loading). The static load can be controlled by displacement and load. The general fatigue loading waveform contains dynamic fatigue test requirements of various waveforms such as sine wave, square wave, triangle wave, sawtooth wave (including combined waveform), etc. The loading frequency (0-100Hz), loading times, loading amplitude, etc. can be adjusted. The DynamicTest dynamic measurement and control platform software can support various test functions such as test project management, test data upload, online PID parameter setting, dynamic data display and storage, sensor calibration, etc.

[0009] The model box test model box is a rectangular parallelepiped with four closed sides and an open top. The model box is 80 cm long, 50 cm wide, 60 cm high, and 1.5 cm thick. The model pile is 20D away from the model box boundary (D is the model pile diameter 20 mm), and the influence of the boundary effect can be ignored. The model box material is organic glass, which has good light transmittance, can greatly improve the clarity of the photo, and reduce environmental errors.

[0010] The above technical solution further includes:

[0011] A square groove is provided inside the experimental table, the first servo motor is fixedly installed inside the square groove, the threaded rod is rotationally connected to the square groove, and the moving block is slidingly connected to the square groove.

[0012] The experimental table is fixedly connected to the first frame, a control panel for controlling the start of the machine is arranged on the outside of the first frame, the first barrel base is connected to the connecting beam by a pull rod, an exhaust hole is opened inside the first barrel base, and the exhaust hole is convenient for exhausting the air inside the first barrel base during the static pressure process.

[0013] A tension and compression sensor is disposed on one side of the second frame close to the connecting rod, and a displacement sensor is disposed on one side of the second frame close to the tension and compression sensor.

[0014] A tilt sensor is arranged on a side of the connecting rod away from the second frame.

[0015] A protection plate is fixedly connected to one side of the experimental table close to the second frame. Two groups of protection plates are symmetrically arranged and can ensure that the position of the model box does not shift when it moves. A model box position locator is arranged on the side of the protection plate close to the experimental table.

[0016] An LED lamp is arranged above the experimental table.

[0017] A support frame is fixedly connected to a side of the experimental table away from the LED lamp, and a CCD camera is arranged on a side of the support frame away from the experimental table;

[0018] Among them, the Charge Coup led Device (CCD) industrial camera is used to collect real-time images of the barrel foundation during static pressure penetration and horizontal loading in sand. According to the accuracy requirements, the maximum speed of continuous image recording of the camera is 870 images per minute.

[0019] A control system component is disposed above one side of the experimental table close to the first frame;

[0020] Among them, the control system component can control the image processing system, which is mainly implemented by PI Vview2C and post-processing software Tecp l ot 10. Its basic principle is to select two captured images before and after the displacement occurs at different times, based on the digital correlation algorithm and the analysis system of optical grayscale color scale, and adopt the most advanced digital image matching technology. It is based on high-quality imaging technology and integrates the scientific and technological achievements of brightness color scale. Through the correlation of two frames of images of the area to be measured, the analysis realizes the real-time observation of two-dimensional or three-dimensional deformation field.

[0021] The present invention has the following beneficial effects:

[0022] 1. In the present invention, by integrating the static pressure penetration mechanism and the horizontal loading mechanism on the same test bench and equipping a transmission mechanism to realize the automatic movement of the model box, the present invention significantly improves the test efficiency. The staff does not need to manually move the model box, thereby reducing the waiting time and making the test process smoother and more efficient, thereby realizing the test of the offshore wind turbine pile foundation under wave load.

[0023] 2. In the present invention, the two test functions of static pressure penetration and horizontal loading are integrated to form a complete test system. This integrated design not only simplifies the test process, but also improves the accuracy and reliability of the test. By equipping with a variety of sensors such as force and displacement sensors, tension and compression sensors, displacement sensors and inclination sensors, the present invention can collect and record various data during the test in real time. These data provide valuable information for subsequent test analysis and research. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the static pressure penetration and horizontal loading integrated test device proposed by the present invention;

[0025] Figure 2 It is a schematic diagram of the external structure of the present invention;

[0026] Figure 3 It is a schematic diagram of a partial three-dimensional structure of the present invention;

[0027] Figure 4 for Figure 2 A schematic diagram of the structure enlargement in the middle;

[0028] Figure 5 for Figure 2 A magnified schematic diagram of the structure at B in the middle;

[0029] Figure 6 for Figure 3 A magnified schematic diagram of the structure at C in the middle;

[0030] Figure 7 for Figure 3 Enlarged schematic diagram of the structure at point D in the middle.

[0031] In the figure: 1. experimental table; 2. square groove; 3. first servo motor; 4. threaded rod; 5. moving block; 6. model box; 7. first frame; 8. loading beam; 9. force and displacement sensor; 10. connecting beam; 11. first barrel base; 12. exhaust hole; 13. second frame; 14. electric push rod; 15. second servo motor; 16. vertical lifter; 17. tension and compression sensor; 18. displacement sensor; 19. connecting rod; 20. inclination sensor; 21. second barrel base; 22. protection plate; 23. LED light; 24. support frame; 25. CCD camera; 26. model box position locator; 27. control system components. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Embodiment 1

[0034] like Figure 1-Figure 7 As shown, the static pressure penetration and horizontal loading integrated test device proposed by the present invention comprises a test bench 1, a transmission mechanism is arranged inside the test bench 1, the transmission mechanism comprises a first servo motor 3 arranged inside the test bench 1, a threaded rod 4 is arranged at the output end of the first servo motor 3, a moving block 5 is threadedly connected to the side of the threaded rod 4 away from the first servo motor 3, a model box 6 is fixedly connected to the top of the moving block 5, and the operation of the transmission mechanism causes the model box 6 to change from a static state to a moving state;

[0035] A static pressure penetration mechanism is arranged above the test bench 1, and the static pressure penetration mechanism includes a first frame 7 arranged above the test bench 1, a loading beam 8 is arranged inside the first frame 7, a force and displacement sensor 9 is arranged below the loading beam 8, a connecting beam 10 is fixedly connected to the side of the force and displacement sensor 9 away from the loading beam 8, a first barrel base 11 is arranged on the side of the connecting beam 10 away from the force and displacement sensor 9, a horizontal loading mechanism is arranged above the test bench 1 away from the first frame 7, and the horizontal loading mechanism includes a second frame 13 arranged above the test bench 1, the test bench 1 and the second frame 13 are fixedly connected, a second servo motor 15 is fixedly installed above the second frame 13, a vertical lifter 16 is arranged above the second frame 13, an electric push rod 14 is arranged at the output end of the second servo motor 15, a connecting rod 19 is arranged on the side of the electric push rod 14 away from the second servo motor 15, and a second barrel base 21 is arranged below the connecting rod 19;

[0036] A square slot 2 is provided inside the experimental table 1, a first servo motor 3 is fixedly installed inside the square slot 2, a threaded rod 4 is rotatably connected to the square slot 2, and a moving block 5 is slidably connected to the square slot 2;

[0037] The test bench 1 is fixedly connected to the first frame 7. A control panel for controlling the start of the machine is arranged on the outside of the first frame 7. The first barrel base 11 is connected to the connecting crossbeam 10 via a tie rod. An exhaust hole 12 is provided inside the first barrel base 11. The exhaust hole 12 is convenient for exhausting the air inside the first barrel base 11 during the static pressure process.

[0038] A tension and compression sensor 17 is disposed on one side of the second frame 13 close to the connecting rod 19, and a displacement sensor 18 is disposed on one side of the second frame 13 close to the tension and compression sensor 17;

[0039] A tilt sensor 20 is provided on a side of the connecting rod 19 away from the second frame 13 .

[0040] In this embodiment, the transmission mechanism provided inside the experimental bench 1 is started, and the first servo motor 3 in the transmission mechanism starts to run. When the first servo motor 3 is running, control is started. A square groove 2 is opened inside the experimental bench 1, and the first servo motor 3 is fixedly installed on the inner wall of the square groove 2. When the first servo motor 3 is running, it starts to control the threaded rod 4 provided at its output end to rotate, and the other end of the threaded rod 4 rotates on the inner wall of the square groove 2. When the threaded rod 4 rotates, a spiral force is generated inside the moving block 5. Due to the sliding connection between the bottom of the moving block 5 and the inner wall of the square groove 2, the moving block 5 starts to slide on the inner wall of the square groove 2. When the moving block 5 moves, it drives the model box 6 fixedly connected to the top of it to start moving, and the model box 6 moves to the bottom of the static pressure sinking mechanism;

[0041] Start the static pressure penetration mechanism, a first frame 7 is fixedly connected above the test bench 1, a loading beam 8 arranged on the inner side of the first frame 7 starts to move downward, and a force and displacement sensor 9 arranged below the loading beam 8 also moves downward accordingly. The force and displacement sensor 9 can realize real-time control and collection of penetration resistance and depth during the static pressure process of the barrel base, and drives the connecting beam 10 to start moving downward during the movement. A first barrel base 11 is arranged on the other side of the connecting beam 10, and drives the first barrel base 11 to move downward when the connecting beam 10 moves. The first barrel base 11 moves to the inner wall of the model box 6 for penetration operation, and the loading mode can be controlled by displacement and load mode. The first barrel base 11 is connected to the pull rod and the loading beam 8 through the pull rod hole on the top cover plate, and the pull rod is pressed down with the loading beam 8 to realize static pressure penetration of the first barrel base 11;

[0042] After the static pressure penetration test is completed, the model box 6 is moved to the horizontal loading position by starting the transmission mechanism. After the static pressure penetration is completed, the horizontal load of the barrel foundation is mainly completed by the horizontal loading mechanism. The horizontal loading mechanism mainly includes a second frame 13, an electric push rod 14, a second servo motor 15, a vertical lifter 16, a tension and compression sensor 17, a displacement sensor 18, a connecting rod 19, an inclination sensor 20, and a second barrel base 21. The tension and compression sensor 17 uses a DYLF-102 weighing sensor, which is used to measure the horizontal bearing capacity of the loading point of the barrel foundation during the horizontal loading process. The maximum measured load is 100N. The displacement sensor LVDT is used to measure the real-time displacement during the horizontal loading process. The maximum measured displacement range is 132mm. The control software of the horizontal loading all-in-one machine is operated through the control system component 27 set on the top of the experimental bench 1. The control system component 27 adopts the dynamic servo measurement and control series products of Jiangsu Suzhou Tiema Automation: DynamicTest dynamic measurement and control software. The second servo motor 15 is started to control the electric push rod 14 to run. When the electric push rod 14 is running, it starts to control the connecting rod 19 set at its output end to move horizontally. When the connecting rod 19 moves horizontally, it will drive the second barrel base 21 set below it to move inside the simulated sand inside the model box 6, and transmit data through the tension and compression sensor 17 and the displacement sensor 18. The inclination sensor 20 set on the connecting rod 19 adopts the Ruifen HCA726 model. This product integrates a high-tech MEMS inclination unit with a measurement range of up to ±180° and a full-range measurement accuracy of up to 0.01°. It can realize the barrel base dual-axis and single-axis angle measurement and complete the horizontal loading operation test.

[0043] Embodiment 2

[0044] like Figure 1-Figure 7 As shown, based on the first embodiment, a protective plate 22 is fixedly connected to one side of the experimental table 1 close to the second frame 13, and two groups of protective plates 22 are symmetrically arranged to ensure that the position of the model box 6 does not shift when it moves. A model box position locator 26 is arranged on one side of the protective plate 22 close to the experimental table 1;

[0045] An LED light 23 is provided above the experimental table 1;

[0046] A support frame 24 is fixedly connected to a side of the experimental table 1 away from the LED lamp 23, and a CCD camera 25 is arranged on a side of the support frame 24 away from the experimental table 1;

[0047] A control system component 27 is disposed above one side of the test bench 1 close to the first frame 7 .

[0048] In this embodiment, two groups of protection plates 22 are symmetrically arranged above the experimental table 1, and the model box 6 slides between the two groups of protection plates 22 to ensure that the model box 6 will not be offset when moving. The model box 6 is positioned by cooperating with the model box position locator 26 set on the side of the protection plate 22. An LED lamp 23 is arranged above the experimental table 1, and multiple groups of LED lamps 23 are arranged to ensure sufficient light source when recording data during the test. A support frame 24 is fixedly connected above the experimental table 1, and multiple groups of CCD cameras 25 are installed on the side of the support frame 24 away from the experimental table 1. The multiple groups of CCD cameras 25 are used to record the changes of sand and soil during the test.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A static pressure penetration and horizontal loading integrated test device, comprising a test bench (1), characterized in that: The experimental table (1) is provided with a transmission mechanism inside, the transmission mechanism comprising a first servo motor (3) provided inside the experimental table (1), a threaded rod (4) being provided at the output end of the first servo motor (3), a moving block (5) being threadedly connected to a side of the threaded rod (4) away from the first servo motor (3), a model box (6) being fixedly connected to the top of the moving block (5), and the operation of the transmission mechanism causes the model box (6) to change from a static state to a moving state; A static pressure penetration mechanism is arranged above the test bench (1), and the static pressure penetration mechanism comprises a first frame (7) arranged above the test bench (1), a loading beam (8) is arranged inside the first frame (7), a force and displacement sensor (9) is arranged below the loading beam (8), a connecting beam (10) is fixedly connected to the side of the force and displacement sensor (9) away from the loading beam (8), a first barrel base (11) is arranged on the side of the connecting beam (10) away from the force and displacement sensor (9), and a horizontal loading beam (11) is arranged above the test bench (1) away from the first frame (7). The horizontal loading mechanism comprises a second frame (13) arranged above the experimental table (1), the experimental table (1) and the second frame (13) are fixedly connected, a second servo motor (15) is fixedly installed above the second frame (13), a vertical lifter (16) is arranged above the second frame (13), an electric push rod (14) is arranged at the output end of the second servo motor (15), a connecting rod (19) is arranged on the side of the electric push rod (14) away from the second servo motor (15), and a second barrel base (21) is arranged below the connecting rod (19).

2. The static pressure penetration and horizontal loading integrated test device according to claim 1 is characterized in that: A square groove (2) is provided inside the experimental table (1), the first servo motor (3) is fixedly installed inside the square groove (2), the threaded rod (4) is rotationally connected to the square groove (2), and the moving block (5) is slidingly connected to the square groove (2).

3. The static pressure penetration and horizontal loading integrated test device according to claim 1 is characterized in that: The experimental table (1) is fixedly connected to the first frame (7), a control panel for controlling the start of the machine is arranged on the outside of the first frame (7), the first barrel base (11) is connected to the connecting crossbeam (10) via a pull rod, and an exhaust hole (12) is provided inside the first barrel base (11), and the exhaust hole (12) facilitates the exhaust of the air inside the first barrel base (11) during the static pressure process.

4. The static pressure penetration and horizontal loading integrated test device according to claim 1 is characterized in that: A tension and compression sensor (17) is provided on one side of the second frame (13) close to the connecting rod (19), and a displacement sensor (18) is provided on one side of the second frame (13) close to the tension and compression sensor (17).

5. The static pressure penetration and horizontal loading integrated test device according to claim 1 is characterized in that: A tilt sensor (20) is provided on a side of the connecting rod (19) away from the second frame (13).

6. The static pressure penetration and horizontal loading integrated test device according to claim 1 is characterized in that: A protective plate (22) is fixedly connected to one side of the experimental table (1) above and close to the second frame (13); the protective plates (22) are symmetrically arranged in two groups and can ensure that the position of the model box (6) does not shift when it moves; and a model box position locator (26) is arranged on the side of the protective plate (22) close to the experimental table (1).

7. The static pressure penetration and horizontal loading integrated test device according to claim 1 is characterized in that: An LED lamp (23) is arranged above the experimental table (1).

8. The static pressure penetration and horizontal loading integrated test device according to claim 7 is characterized in that: A support frame (24) is fixedly connected to a side of the experimental table (1) away from the LED lamp (23), and a CCD camera (25) is arranged on a side of the support frame (24) away from the experimental table (1).

9. The static pressure penetration and horizontal loading integrated test device according to claim 1 is characterized in that: A control system component (27) is arranged above one side of the experimental platform (1) close to the first frame (7).

Images