A prestressed pipe pile bearing capacity testing device

Abstract

The present application relates to the technical field of pipe pile testing, and specifically relates to a pre-stressed pipe pile bearing capacity testing device, which comprises a lower panel, the upper end of the lower panel is provided with a jack, the upper end of the jack is provided with an upper panel, the upper ends of the lower panel and the upper panel are both fixedly installed with two groups of displacement rods, the upper ends of the displacement rods are provided with displacement sensors, the displacement sensors are fixedly installed at the bottom end of a reference beam, the testing device comprises a positioning mechanism and a cleaning mechanism, the positioning mechanism further comprises a first moving module and a second moving module, the force plate can be stably installed at the bottom end of the baffle from above the baffle, the force plate can be integrally installed, the stress intensity is higher, the force effect is better, the stability of the bearing capacity testing is improved, the testing device can be quickly disassembled and taken out, recycling is facilitated, and the testing cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of pipe pile testing technology, and in particular to a prestressed pipe pile bearing capacity testing device. Background Technology

[0002] Prestressed concrete pipe piles can withstand large loads, are robust and durable, and have a fast pile-forming speed, making them one of the most widely used pile types. After the prestressed concrete pipe piles are driven, it is often necessary to test the end bearing capacity of the pile. Static load testing involves applying axial pressure, axial uplift force at the top of the pile, or horizontal force at a consistent elevation on the bottom of the pile cap, according to the pile's intended use. The settlement, uplift displacement, or horizontal displacement of the corresponding test points over time is observed, and the corresponding vertical compressive bearing capacity, vertical uplift bearing capacity, or horizontal bearing capacity of a single pile is determined based on the relationship between load and displacement. There are three commonly used static load testing methods for pile foundations: surcharge method, anchor pile method, and self-balancing method. The self-balancing method divides the test pile into upper and lower ends. It utilizes the self-balancing of the side resistance of the upper pile and the side resistance and end resistance of the lower pile to achieve a simpler test setup, avoiding the need for a large reaction device.

[0003] Most existing pipe pile bearing capacity testing devices are disposable equipment that cannot be removed after use, resulting in high costs. Most of the removable ones are fixed by hinges and snap-fits, which have a small stress range, are prone to damage, and have poor testing results. Furthermore, the installation and testing process is prone to collisions with the inner wall of the pipe pile, causing sand and dust to fall and accumulate on the stress plate, which can easily affect the stability of the installation.

[0004] To address the aforementioned technical problems, Chinese Patent Application No. CN201110008232.8 discloses a load cell for testing the bearing capacity of steel pipe piles. By using a clamping claw to abut against the upper ring plate, and applying hydraulic pressure with jacks on the load cell body, the upper and lower ring plates undergo relative displacement, which in turn causes relative displacement between the upper and lower steel pipe sections. Displacement measuring devices installed in the load cell body and inner pipe can measure the displacement of the pile along its depth. Based on the readings, corresponding curves are plotted to determine the pile bearing capacity, pile settlement, pile elastic compression, and soil plastic deformation. After the test is completed, the rope is retracted, the clamping claw leaves the upper ring plate, and the entire load cell body is lifted off the connecting base. The load cell body can be reused after being lifted out of the steel pipe.

[0005] This type of load cell used for testing the bearing capacity of steel pipe piles can be retrieved after use, but the force is entirely dependent on the hinged clamping claws, resulting in a small force-bearing area, unstable structure, and the hinge points are prone to excessive stress and deformation, leading to poor performance.

[0006] To address this, a prestressed pipe pile bearing capacity testing device is proposed. Summary of the Invention

[0007] The purpose of this invention is to provide a prestressed pipe pile bearing capacity testing device to solve the problems of unstable installation and dust accumulation affecting the stress mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a prestressed pipe pile bearing capacity testing device, comprising a lower panel, a jack at the upper end of the lower panel, an upper panel at the upper end of the jack, two sets of displacement rods fixedly installed at the upper ends of both the lower and upper panels, displacement sensors at the upper ends of the displacement rods, and displacement sensors fixedly installed at the bottom end of a reference beam. The testing device includes a positioning mechanism and a cleaning mechanism. The positioning mechanism further includes a first moving module and a second moving module. The first moving module can control the lifting and lowering of the force plate at the upper end of the first prestressed pipe pile, and the second moving module can control the horizontal movement of the force plate at the upper end of the first prestressed pipe pile. By cooperating with the first moving module, the force plate with a length greater than the inner diameter of the baffle can be stably installed from above the upper seat plate to the bottom of the baffle, so that the bearing capacity test is conducted through the force plate with more stable force.

[0009] The cleaning mechanism includes a first jet module and a second jet module. The second jet module works in conjunction with the first jet module so that the operation of both the first and second moving modules can provide blowing gas to the nozzle, which can thoroughly clean the dust that falls onto the stress plate, allowing the stress plate to fit tightly against the bottom of the baffle.

[0010] Preferably, the first moving module includes a base fixedly mounted on the upper end of the upper plate. The base is slidably connected to a slide block via a slide groove. The slide block is slidably connected to a limit plate via a second cavity opened inside. A top block is fixedly connected to the upper end of the limit plate. The other end of the top block passes through the slide block and is hinged to a force-bearing plate.

[0011] Preferably, a second reset spring is provided between the second chamber and the limiting plate, and one end of a second steel wire rope is fixedly connected to the bottom end of the limiting plate. The other end of the second steel wire rope passes through the limiting plate and the top block and extends to the upper end of the first prestressed pipe pile. Double guide pulleys and a second pulley are attached to the outside of the second steel wire rope.

[0012] Preferably, the length of the load-bearing plate is a, the width of the load-bearing plate is b, the inner diameter of the baffle is d, and the relationship between a, d and b satisfies: a > d > b. The diameters of the lower panel and the upper panel are f, and the relationship between d and f satisfies: d ≥ f.

[0013] Preferably, the second moving module includes a first return spring disposed between the slide groove and the slide block, one end of a first steel wire rope is fixedly connected to the inner wall of the slide groove, the other end of the first steel wire rope extends through the first chamber, the second chamber, the limiting plate and the top block to the upper end of the first prestressed pipe pile, and a first pulley and a double guide pulley are attached to the outer side of the first steel wire rope.

[0014] Preferably, a baffle plate is fixedly installed on one side of the slide block, and the baffle plate is snapped above the slide groove.

[0015] Preferably, the first jet module includes a first telescopic airbag disposed between the second chamber and the limiting plate. The upper end of the first telescopic airbag is fixedly connected to one end of a first air supply pipe, and the other end of the first air supply pipe passes through the limiting plate and the top block and is connected to a nozzle.

[0016] Preferably, the nozzle is fixedly installed on the upper end of the top block, and the two ends of the nozzle rotate 360 ​​degrees to spray air, which can blow air to different positions on the upper part of the inclined load-bearing plate.

[0017] Preferably, the second jet module includes a second telescopic airbag disposed between the slide groove and the slide block. One end of the second telescopic airbag is fixedly connected to the second air supply pipe, and the other end of the second air supply pipe passes through the limiting plate and is connected to the first air supply pipe.

[0018] Preferably, a one-way valve is provided on both the first and second air supply pipes, and an air inlet valve is provided on the outer side of both the first and second telescopic airbags.

[0019] The beneficial effects of this invention are:

[0020] 1. By designing a second moving module to work in conjunction with the first moving module, this invention facilitates the stable installation of the load-bearing plate from above the baffle to the bottom of the baffle, allowing the load-bearing plate to be installed as a whole, resulting in higher load strength, better load-bearing effect, improved stability of load-bearing capacity testing, and quick disassembly and removal for easy recycling and reduced testing costs.

[0021] 2. By designing a first jet module and a second jet module to work together, this invention facilitates the use of the working process of the first and second moving modules to provide gas to the nozzle for cleaning dust on the force plate. This allows the force plate to fit tightly against the bottom of the baffle, preventing dust from affecting the stability of the force. Furthermore, both the first and second moving modules can provide gas to the nozzle, which increases the gas supply source for the nozzle, improves the stability of the gas supply, and further enhances the cleaning effect. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this invention or the prior art, 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 for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1This is a schematic cross-sectional view of a prestressed pipe pile bearing capacity testing device according to an embodiment of the present invention. Figure 1 ;

[0024] Figure 2 This invention provides an embodiment of a prestressed pipe pile bearing capacity testing device. Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3 This is a schematic cross-sectional view of a prestressed pipe pile bearing capacity testing device according to an embodiment of the present invention. Figure 1 ;

[0026] Figure 4 This invention provides an embodiment of a prestressed pipe pile bearing capacity testing device. Figure 3 Enlarged view of point B in the middle;

[0027] Figure 5 This is a partial three-dimensional schematic diagram of a prestressed pipe pile bearing capacity testing device according to an embodiment of the present invention;

[0028] Figure 6 This is a partial explosion diagram of a prestressed pipe pile bearing capacity testing device according to an embodiment of the present invention. Figure 1 ;

[0029] Figure 7 This is a partial explosion diagram of a prestressed pipe pile bearing capacity testing device according to an embodiment of the present invention. Figure 2 ;

[0030] Figure 8 This invention provides an embodiment of a prestressed pipe pile bearing capacity testing device. Figure 7 Enlarged diagram of point C in the middle.

[0031] The following are labeled in the diagram: 1. Lower panel; 2. Jack; 3. Upper panel; 4. Displacement rod; 5. Displacement sensor; 6. Reference beam; 7. Lower panel groove; 8. Lower base plate; 9. Upper base plate; 10. Baffle; 11. First prestressed pipe pile; 12. Second prestressed pipe pile; 13. Base; 14. Slide groove; 15. Slide seat; 16. Baffle plate; 17. First chamber; 18. Second chamber; 19. Limiting plate; 20. Top block; 21. Force plate; 22. First return spring; 23. First wire rope; 24. First pulley; 25. Double guide pulley; 26. Second return spring; 27. Second wire rope; 28. Second pulley; 29. ​​First telescopic airbag; 30. First air supply pipe; 31. Nozzle; 32. Second telescopic airbag; 33. Second air supply pipe; 34. One-way valve; 35. Inlet valve. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0033] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] Please see Figures 1 to 8 This invention provides a technical solution: a prestressed pipe pile bearing capacity testing device, comprising a lower panel 1, a jack 2 at the upper end of the lower panel 1, an upper panel 3 at the upper end of the jack 2, the lower panel 1 being fitted into a lower panel groove 7 at the upper end of a lower base plate 8, an upper base plate 9 at the upper end of the lower base plate 8, and a baffle 10 inside the upper base plate 9, the lower base plate 8 and the upper base plate 9 being positioned between a first prestressed pipe pile 11 and a second prestressed pipe pile 12, two sets of displacement rods 4 being fixedly installed at the upper ends of both the lower panel 1 and the upper panel 3, and displacement sensors 5 being installed at the upper ends of the displacement rods 4. The device 5 is fixedly installed at the bottom end of the reference beam 6. The testing device includes a positioning mechanism and a cleaning mechanism. The positioning mechanism also includes a first moving module and a second moving module. The first moving module can control the force plate 21 to rise and fall at the upper end of the first prestressed pipe pile 11. The second moving module can control the force plate 21 to move horizontally at the upper end of the first prestressed pipe pile 11. With the cooperation of the second moving module and the first moving module, the force plate 21, which is longer than the inner diameter of the baffle 10, can be stably installed at the bottom of the baffle 10 from above the upper seat plate 9, so that the bearing capacity test can be performed more stably through the force plate 21.

[0035] The cleaning mechanism includes a first jet module and a second jet module. The second jet module works in conjunction with the first jet module so that the operation of both the first and second moving modules can provide blowing gas to the nozzle 31, which can thoroughly clean the dust that falls onto the force plate 21, so that the force plate 21 can fit tightly against the bottom of the baffle 10.

[0036] As one embodiment of the present invention, such as Figure 3 and Figure 4 as well as Figure 5As shown, the first moving module includes a base 13 fixedly installed on the upper end of the upper panel 3. A groove 14 is formed at the upper end of the base 13, and a slide block 15 is slidably connected to the groove 14. A first chamber 17 and a second chamber 18 are formed inside the slide block 15. A limiting plate 19 is slidably connected inside the second chamber 18. A top block 20 is fixedly connected to the upper end of the limiting plate 19. The other end of the top block 20 passes through the slide block 15 and is hinged to a force-bearing plate 21. A second return spring 26 is provided between the bottom end of the second chamber 18 and the bottom end of the limiting plate 19. One end of a second steel wire rope 27 is fixedly connected to the bottom end of the limiting plate 19. The other end of the second steel wire rope 27 passes through the limiting plate 19 and the top block 20 and extends to the upper end of the first prestressed pipe pile 11. A double guide pulley 25 and a second pulley 28 are attached to the outer side of the rope 27. The double guide pulley 25 is fixed to the bottom end of the reference beam 6, and the second pulley 28 is fixed to the top end of the first chamber 17. The length of the force plate 21 is a, the width of the force plate 21 is b, and the inner diameter of the baffle 10 is d. The relationship between a, d, and b is: a > d > b. The diameters of the lower panel 1 and the upper panel 3 are f, and the relationship between d and f is: d ≥ f. The second moving module includes a first return spring 22 disposed between the inner wall of the slide groove 14 and the slide seat 15. One end of the first steel wire rope 23 is fixedly connected to the inner wall of the slide groove 14. The other end of the first steel wire rope 23 passes through the first chamber 17, the second chamber 18, the limiting plate 19, and the top block 20, extending to the first prestressed pipe pile 1. At the upper end of 1, a first pulley 24 and a double guide pulley 25 are attached to the outer side of the first wire rope 23. The first pulley 24 is fixed to the top of the first chamber 17. A baffle plate 16 is fixedly installed on one side of the slide seat 15. The baffle plate 16 is locked above the slide groove 14 to prevent dust from falling into the slide groove 14 and affecting the shrinkage effect. When installation is required for the bearing capacity test of the pipe pile, the lower panel 1, jack 2 and upper panel 3 are first hoisted as a whole into the first prestressed pipe pile 11 and the second prestressed pipe pile 12, so that the lower panel 1 is locked in the upper and lower panel grooves 7 of the lower seat plate 8. Then, the first wire rope 23 is pulled. The first wire rope 23 drives the force plate 21 at the upper end of the slide seat 15 to be inserted into the baffle plate 1 through the first pulley 24 and the double guide pulley 25. At the bottom of the slide block 15, the force plate 21 hinged to the top of the top block 20 needs to be tilted in the direction in which the slide block 15 can move, that is, tilted backward. Then, the second steel wire rope 27 is pulled. The second steel wire rope 27 drives the limiting plate 19 to descend through the double guide pulley 25 and the second pulley 28. The limiting plate 19 drives the force plate 21 hinged to the top of the top block 20 to descend through the top block 20. As the force plate 21 descends, the tilted force plate 21 gradually becomes horizontally balanced under the resistance of the slide block 15. Finally, the first steel wire rope 23 is released to keep the second steel wire rope 27 taut. The restoring force of the first return spring 22 drives the force plate 21 at the top of the slide block 15 to return to the central position, so that the two ends of the force plate 21 can be evenly stressed. Then, the second steel wire rope 27 is released.The restoring force of the second return spring 26, through the limiting plate 19 and the top block 20, causes the force plate 21 to be tightly pressed against the bottom end of the baffle 10 inside the upper seat plate 9. Similarly, pulling the first steel wire rope 23 and then releasing it without keeping the second steel wire rope 27 taut allows the force plate 21 to return to its tilted state, facilitating removal. This also allows the force plate 21 to be stably installed from above the baffle 10 to its bottom end. The overall strength of the force plate 21 is higher, resulting in better force-bearing performance, improved stability of the load-bearing capacity test, and quick disassembly and removal for easy recycling and reduced testing costs.

[0037] As one embodiment of the present invention, such as Figure 4 and Figure 7 as well as Figure 8As shown, the first jet module includes a first telescopic airbag 29 disposed between the bottom of the second chamber 18 and the limiting plate 19. One end of a first air supply pipe 30 is fixedly connected to the upper end of the first telescopic airbag 29. The other end of the first air supply pipe 30 passes through the limiting plate 19 and the top block 20 and is connected to a nozzle 31. The nozzle 31 is fixedly installed on the upper end of the top block 20. The two ends of the nozzle 31 rotate 360 ​​degrees to spray air, enabling it to blow air onto different positions on the upper end of the inclined force plate 21. The second jet module includes a sliding base disposed on the inner wall of the slide groove 14. The second telescopic airbag 32 between 15 is fixedly connected to one end of the second air supply pipe 33. The other end of the second air supply pipe 33 passes through the limiting plate 19 and is connected to the first air supply pipe 30. Both the first air supply pipe 30 and the second air supply pipe 33 are equipped with one-way valves 34. The outer sides of the first telescopic airbag 29 and the second telescopic airbag 32 are equipped with air inlet valves 35. When the second steel wire rope 27 drives the limiting plate 19 to descend, the first telescopic airbag 29 is compressed by the pressure of the limiting plate 19. The first telescopic airbag 29 is released through the first air supply pipe 34. Gas is introduced into nozzle 31, which sprays air onto the surface of the force plate 21 for cleaning. When the first steel wire rope 23 moves the slide 15, the second telescopic airbag 32 is compressed and contracted by the slide 15. The gas inside the second telescopic airbag 32 is sent into nozzle 31 through the first air supply pipe 30 and the second air supply pipe 33. Nozzle 31 sprays air onto the surface of the force plate 21 for cleaning. One-way valve 34 prevents gas backflow. Finally, the restoring force of the first return spring 22 and the second return spring 26 can respectively drive the second telescopic airbag 32 and the first telescopic airbag 21. The extension of the air bladder 29 allows the first telescopic air bladder 29 and the second telescopic air bladder 32 to draw in gas through the air intake valve 35 for supplementation. This facilitates the use of the first and second moving modules to provide gas to the nozzle 31 for cleaning dust from the force plate 21, ensuring that the force plate 21 fits tightly against the bottom of the baffle 10 and preventing dust from affecting the stability of the force. Furthermore, both the first and second moving modules can provide gas to the nozzle 31, increasing the air supply source for the nozzle 31, improving the stability of the air supply, and further enhancing the cleaning effect.

[0038] Working principle: When installation is required for the bearing capacity test of the pipe pile, the lower panel 1, jack 2, and upper panel 3 are first hoisted as a whole into the first prestressed pipe pile 11 and the second prestressed pipe pile 12, so that the lower panel 1 is locked in the upper and lower panel grooves 7 of the lower seat plate 8. Then, the first wire rope 23 is pulled. The first wire rope 23 drives the force plate 21 at the upper end of the slide block 15 to be inserted into the bottom end of the baffle 10 through the first pulley 24 and the double guide pulley 25. It is necessary to tilt the force plate 21 hinged at the upper end of the top block 20 in the direction that the slide block 15 can move, that is, tilt it backward. Then, the second wire rope 27 is pulled. The second wire rope 27 drives the limiting plate 19 to descend through the double guide pulley 25 and the second pulley 28. The limiting plate 19 is lowered through the top block. 20 drives the force plate 21 hinged to the upper end of the top block 20 to descend. As the force plate 21 descends, the tilted force plate 21 gradually becomes horizontally balanced under the obstruction of the slide block 15. Finally, the first wire rope 23 is released to keep the second wire rope 27 taut. The restoring force of the first return spring 22 drives the force plate 21 at the upper end of the slide block 15 to return to the central position, so that the two ends of the force plate 21 can be evenly stressed. Then the second wire rope 27 is released. The restoring force of the second return spring 26 drives the force plate 21 to be tightly attached to the bottom end of the baffle 10 inside the upper seat plate 9 through the limit plate 19 and the top block 20. Similarly, pulling the first wire rope 23 and then releasing it without keeping the second wire rope 27 taut can restore the force plate 21 to the tilted state, making it easy to remove.

[0039] When the second wire rope 27 drives the limiting plate 19 to descend, the first telescopic airbag 29 contracts under the pressure of the limiting plate 19. The first telescopic airbag 29 sends gas into the nozzle 31 through the first air supply pipe 30. The nozzle 31 sprays air to clean the surface of the force plate 21. When the first wire rope 23 drives the slide 15 to move, the second telescopic airbag 32 contracts under the pressure of the slide 15. The gas in the second telescopic airbag 32 is sent into the nozzle 31 through the first air supply pipe 30 and the second air supply pipe 33. The nozzle 31 sprays air to clean the surface of the force plate 21. The one-way valve 34 can prevent gas backflow. Finally, the restoring force of the first return spring 22 and the second return spring 26 can drive the second telescopic airbag 32 and the first telescopic airbag 29 to extend, so that the first telescopic airbag 29 and the second telescopic airbag 32 can draw in gas through the air inlet valve 35 for replenishment.

[0040] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0041] This invention is intended to cover all such substitutions, modifications, and alterations falling within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A prestressed pipe pile bearing capacity testing device, comprising a lower panel (1), a jack (2) being provided at the upper end of the lower panel (1), an upper panel (3) being provided at the upper end of the jack (2), two sets of displacement rods (4) being fixedly installed at the upper ends of both the lower panel (1) and the upper panel (3), a displacement sensor (5) being provided at the upper end of the displacement rod (4), and the displacement sensor (5) being fixedly installed at the bottom end of a reference beam (6), characterized in that: The testing device includes a positioning mechanism and a cleaning mechanism. The positioning mechanism also includes a first moving module and a second moving module. The first moving module can control the force plate (21) to move up and down at the upper end of the first prestressed pipe pile (11), and the second moving module can control the force plate (21) to move horizontally at the upper end of the first prestressed pipe pile (11). The lower plate (1) is fitted into the lower plate groove (7) opened at the upper end of the lower base plate (8). The upper end of the lower base plate (8) is provided with an upper base plate (9). The upper base plate (9) is provided with a baffle (10). The lower base plate (8) and the upper base plate (9) are located between the first prestressed pipe pile (11) and the second prestressed pipe pile (12). By using the second moving module in conjunction with the first moving module, a force plate (21) with a length greater than the inner diameter of the baffle (10) can be stably installed from above the upper seat plate (9) to the bottom of the baffle (10), so that the load-bearing capacity test can be performed more stably through the force plate (21). The cleaning mechanism includes a first jet module and a second jet module. The second jet module works in conjunction with the first jet module so that the operation of both the first and second moving modules can provide blowing gas to the nozzle (31), which can fully clean the dust that falls onto the force plate (21) and make the force plate (21) fit tightly against the bottom of the baffle (10).

2. The prestressed pipe pile bearing capacity testing device according to claim 1, characterized in that, The first moving module includes a base (13) fixedly installed on the upper end of the upper panel (3). The base (13) is slidably connected to a slide block (15) through a slide groove (14). The slide block (15) has a first chamber (17) and a second chamber (18) inside. The slide block (15) is slidably connected to a limiting plate (19) through the second chamber (18) inside. A top block (20) is fixedly connected to the upper end of the limiting plate (19). The other end of the top block (20) passes through the slide block (15) and is hinged to a force plate (21).

3. The prestressed pipe pile bearing capacity testing device according to claim 2, characterized in that, A second reset spring (26) is provided between the second chamber (18) and the limiting plate (19). One end of the second steel wire rope (27) is fixedly connected to the bottom end of the limiting plate (19). The other end of the second steel wire rope (27) extends through the limiting plate (19) and the top block (20) to the upper end of the first prestressed pipe pile (11). Double guide pulleys (25) and a second pulley (28) are attached to the outside of the second steel wire rope (27).

4. The prestressed pipe pile bearing capacity testing device according to claim 1, characterized in that, The length of the force plate (21) is a, the width of the force plate (21) is b, the inner diameter of the baffle (10) is d, and the relationship between a, d and b is: a > d > b. The diameter of the lower panel (1) and the upper panel (3) is f, and the relationship between d and f is: d ≥ f.

5. The prestressed pipe pile bearing capacity testing device according to claim 2, characterized in that, The second moving module includes a first return spring (22) disposed between the slide groove (14) and the slide block (15). One end of a first steel wire rope (23) is fixedly connected to the inner wall of the slide groove (14). The other end of the first steel wire rope (23) extends through the first chamber (17), the second chamber (18), the limiting plate (19) and the top block (20) to the upper end of the first prestressed pipe pile (11). A first pulley (24) and a double guide pulley (25) are attached to the outer side of the first steel wire rope (23).

6. The prestressed pipe pile bearing capacity testing device according to claim 5, characterized in that, A baffle plate (16) is fixedly installed on one side of the slide (15), and the baffle plate (16) is locked above the slide groove (14).

7. The prestressed pipe pile bearing capacity testing device according to claim 3, characterized in that, The first jet module includes a first telescopic airbag (29) disposed between the second chamber (18) and the limiting plate (19). The upper end of the first telescopic airbag (29) is fixedly connected to one end of the first air supply pipe (30), and the other end of the first air supply pipe (30) passes through the limiting plate (19) and the top block (20) and is connected to the nozzle (31).

8. The prestressed pipe pile bearing capacity testing device according to claim 7, characterized in that, The nozzle (31) is fixedly installed on the upper end of the top block (20). The two ends of the nozzle (31) rotate 360 ​​degrees to spray air, which can blow air to different positions on the upper end of the inclined force plate (21).

9. The prestressed pipe pile bearing capacity testing device according to claim 7, characterized in that, The second jet module includes a second telescopic airbag (32) disposed between the inner wall of the slide (14) and the slide (15). The second telescopic airbag (32) is fixedly connected to one end of the second air supply pipe (33), and the other end of the second air supply pipe (33) passes through the limiting plate (19) and is connected to the first air supply pipe (30).

10. A prestressed pipe pile bearing capacity testing device according to claim 9, characterized in that, One-way valves (34) are provided on the first gas supply pipe (30) and the second gas supply pipe (33), and air inlet valves (35) are provided on the outside of the second telescopic airbag (32) and the first telescopic airbag (29).

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