Device for testing bearing capacity of prestressed pipe pile

Abstract

The invention relates to the technical field of pipe pile testing, in particular to a prestressed pipe pile bearing capacity testing device which comprises a lower panel, a jack is arranged at the upper end of the lower panel, an upper panel is arranged at the upper end of the jack, two sets of displacement rods are fixedly installed at the upper end of each of the lower panel and the upper panel, and displacement sensors are arranged at the upper ends of the displacement rods. The displacement sensor is fixedly installed at the bottom end of the datum line 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 stress plate can be stably installed at the bottom end of the baffle from the position above the baffle, the stress plate can be integrally installed, the stress strength is higher, and the testing efficiency is improved. The device has a better stress effect, improves the stability of a bearing capacity test, can be quickly disassembled and taken out, is convenient to recycle, and reduces the test cost.

Description

Technical Field

[0001] The invention relates to the technical field of pipe pile testing, and in particular to a prestressed pipe pile bearing capacity testing device. Background Art

[0002] Prestressed pipe piles can withstand large loads, are strong and durable, and have a fast pile forming speed, so they have become one of the widely used pile types. After the prestressed pipe piles are driven, it is often necessary to test the pile end bearing capacity. The static load test refers to the test method of applying axial pressure, axial upward pull force or horizontal force at the same elevation of the bottom surface of the pile foundation pedestal according to the use function of the pile, observing the settlement, upward pull displacement or horizontal displacement of the corresponding detection point of the pile over time, and determining the corresponding single pile vertical compressive bearing capacity, single pile vertical pull bearing capacity or single pile horizontal bearing capacity according to the relationship between load and displacement. There are three commonly used pile foundation static load test methods: stacking method, anchor pile method and self-balancing method. The self-balancing method divides the test pile into upper and lower ends. It is a pile testing method that uses the self-balance of the upper pile side resistance and the lower pile side resistance and end resistance. It avoids the huge reaction force device and the device is relatively simple.

[0003] Most of the existing pipe pile bearing capacity testing devices are disposable equipment, which cannot be taken out after use and are relatively expensive. Most of the ones that can be collected are fixed by means of hinges and clamps, with a small force range, easy to be damaged, and poor test results. In addition, during the installation and testing process, it is easy to collide with the inner wall of the pipe pile, causing sand, gravel and dust to fall and accumulate on the load-bearing plate, which can easily affect the stability of the installation.

[0004] In response to the above technical problems, Chinese patent application number: CN201110008232.8, a load box for testing the bearing capacity of steel pipe piles, through the clamping claws and the upper ring plate against each other, after the jack on the load box body applies oil pressure, the upper ring plate and the lower ring plate are relatively displaced, thereby causing the upper section of the steel pipe and the lower section of the steel pipe to produce relative displacement. The displacement of the pile body along the depth direction can be measured by the displacement measuring device set in the load box body and the inner layer pipe. According to the readings, the corresponding curve is drawn to judge the pile bearing capacity, pile foundation settlement, pile elastic compression and rock and soil plastic deformation. After the test is completed, the rope is retracted, the clamping claws leave the upper ring plate, and the entire load box body is driven to leave the connection base. After the load box body is lifted out of the steel pipe, it can be reused.

[0005] This load box used to test the bearing capacity of steel pipe piles can be collected after use, but the force is completely dependent on the hinged clamping claws, the force-bearing area is small, the structure is unstable, and the hinge point is easily deformed by excessive force, resulting in poor use effect.

[0006] Therefore, a prestressed pipe pile bearing capacity testing device is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a prestressed pipe pile bearing capacity testing device to solve the problems of unstable installation and accumulation of dust affecting the force proposed in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a prestressed pipe pile bearing capacity testing device, comprising a lower panel, a jack is arranged at the upper end of the lower panel, an upper panel is arranged at the upper end of the jack, two groups of displacement rods are fixedly installed at the upper ends of the lower panel and the upper panel, a displacement sensor is arranged at the upper end of the displacement rod, and the displacement sensor is fixedly installed at the bottom end of the 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 first moving module can control the lifting and lowering of the force plate at the upper end of the first prestressed pipe pile, the second moving module can control the horizontal movement of the force plate at the upper end of the first prestressed pipe pile, and the second moving module cooperates with the first moving module to stably install the force plate with a length greater than the inner diameter of the baffle from above the upper seat plate to the bottom of the baffle, so that the bearing capacity test can be more stably stressed through the force plate; The cleaning mechanism includes a first jet module and a second jet module. The second jet module cooperates with the first jet module so that the operation of the first movable module and the second movable module can provide blowing gas for the nozzle, which can fully clean the dust falling on the force-bearing plate and enable the force-bearing plate to fit tightly with the bottom of the baffle.

[0009] Preferably, the first movable module includes a base fixedly mounted on the upper end of the upper panel, the base is slidably connected to the slide through a slide groove, the slide is slidably connected to the limiting plate through a second chamber opened inside, the upper end of the limiting plate is fixedly connected to a top block, and the other end of the top block passes through the slide and is hinged to a force plate.

[0010] Preferably, a second return spring is arranged between the second chamber and the limit plate, one end of the second steel wire rope is fixedly connected to the bottom end of the limit plate, the other end of the second steel wire rope passes through the limit plate and the top block and extends to the upper end of the first prestressed pipe pile, and a double guide pulley and a second pulley are attached to the outer side of the second steel wire rope.

[0011] Preferably, the length of the force-bearing plate is a, the width of the force-bearing plate is b, the inner diameter of the baffle is d, 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.

[0012] Preferably, the second movable module includes a first return spring arranged between the slide groove and the slide seat, one end of the first steel wire rope is fixedly connected to the inner wall of the slide groove, the other end of the first steel wire rope passes through the first chamber, the second chamber, the limit plate and the top block and extends to the upper end of the first prestressed pipe pile, and the first pulley and the double guide pulley are attached to the outer side of the first steel wire rope.

[0013] Preferably, a shielding plate is fixedly mounted on one side of the slide seat, and the shielding plate is clamped above the slide groove.

[0014] Preferably, the first jet module includes a first telescopic airbag arranged between the second chamber and the limiting plate, the upper end of the first telescopic airbag is fixedly connected to one end of the first air pipe, and the other end of the first air pipe passes through the limiting plate and the top block and is connected to the nozzle.

[0015] Preferably, the nozzle is fixedly mounted on the upper end of the top block, and the two side ends of the nozzle can rotate 360 ​​degrees to spray air, so as to blow different positions on the upper end of the inclined force-bearing plate.

[0016] Preferably, the second jet module includes a second telescopic airbag arranged between the slide groove and the slide seat, the second telescopic airbag is fixedly connected to one end of the second air pipe, and the other end of the second air pipe passes through the limiting plate and is connected to the first air pipe.

[0017] Preferably, both the first air supply pipe and the second air supply pipe are provided with a one-way valve, and both the outer sides of the first telescopic airbag and the second telescopic airbag are provided with an air inlet valve.

[0018] Beneficial effects of the present invention: 1. The present invention is advantageous for stably installing the force-bearing plate from the top of the baffle to the bottom of the baffle by designing the second movable module to cooperate with the first movable module, so that the force-bearing plate can be installed as a whole, with higher force strength and better force effect, thus improving the stability of the bearing capacity test, and can be quickly disassembled and taken out for easy recycling, thereby reducing the testing cost.

[0019] 2. The present invention is designed to cooperate with the first jet module and the second jet module, which is beneficial to utilizing the working process of the first movable module and the second movable module to provide the nozzle with gas for cleaning the dust on the force-bearing plate, so that the force-bearing plate can fit tightly with the bottom of the baffle to avoid dust affecting the stability of the force, and the first movable module and the second movable module can both provide gas for the nozzle, which is convenient for increasing the air supply source of the nozzle, improving the stability of the air supply, and further improving the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 The overall cross-sectional view of a prestressed pipe pile bearing capacity testing device according to an embodiment of the present invention is shown in FIG. Figure 1 ; Figure 2 A prestressed pipe pile bearing capacity testing device according to an embodiment of the present invention Figure 1 The enlarged schematic diagram at A in the middle; Figure 3 The overall cross-sectional view of a prestressed pipe pile bearing capacity testing device according to an embodiment of the present invention is shown in FIG. Figure 1 ; Figure 4 A prestressed pipe pile bearing capacity testing device according to an embodiment of the present invention Figure 3 The enlarged schematic diagram of point B in the middle; Figure 5 It is a partial three-dimensional schematic diagram of a prestressed pipe pile bearing capacity testing device according to an embodiment of the present invention; Figure 6 A schematic diagram of a partial explosion of a prestressed pipe pile bearing capacity testing device according to an embodiment of the present invention Figure 1 ; Figure 7 A schematic diagram of a partial explosion of a prestressed pipe pile bearing capacity testing device according to an embodiment of the present invention Figure 2 ; Figure 8 A prestressed pipe pile bearing capacity testing device according to an embodiment of the present invention Figure 7 Enlarged schematic diagram at point C in the middle.

[0022] The markings in the figure are: 1. lower panel; 2. jack; 3. upper panel; 4. displacement rod; 5. displacement sensor; 6. reference beam; 7. lower panel groove; 8. lower seat plate; 9. upper seat plate; 10. baffle; 11. first prestressed pipe pile; 12. second prestressed pipe pile; 13. base; 14. slide groove; 15. slide seat; 16. shielding plate; 17. first chamber; 18. second chamber; 19. limit plate; 20. top block; 21. force plate; 22. first return spring; 23. first steel wire rope; 24. first pulley; 25. double guide pulley; 26. second return spring; 27. second steel wire rope; 28. second pulley; 29. ​​first telescopic airbag; 30. first air pipe; 31. nozzle; 32. second telescopic airbag; 33. second air pipe; 34. one-way valve; 35. intake valve. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0024] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] See also Figures 1 to 8 The present invention provides a technical solution: a prestressed pipe pile bearing capacity testing device, comprising a lower panel 1, a jack 2 is arranged at the upper end of the lower panel 1, an upper panel 3 is arranged at the upper end of the jack 2, the lower panel 1 is clamped in a lower panel groove 7 opened at the upper end of a lower seat plate 8, an upper seat plate 9 is arranged at the upper end of the lower seat plate 8, a baffle 10 is arranged inside the upper seat plate 9, the lower seat plate 8 and the upper seat plate 9 are arranged between a first prestressed pipe pile 11 and a second prestressed pipe pile 12, two groups of displacement rods 4 are fixedly installed at the upper ends of the lower panel 1 and the upper panel 3, a displacement sensor 5 is arranged at the upper end of the displacement rod 4, and the displacement sensor The test device 5 is fixedly installed at the bottom end of the reference beam 6. The test 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 be lifted and lowered at the upper end of the first prestressed pipe pile 11. The second moving module can control the force plate 21 to be horizontally moved at the upper end of the first prestressed pipe pile 11. Through the cooperation of the second moving module with the first moving module, the 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 bearing capacity test can be more stably stressed through the force plate 21. The cleaning mechanism includes a first jet module and a second jet module. The second jet module cooperates with the first jet module so that the operation of the first movable module and the second movable module can provide blowing gas to the nozzle 31, so as to fully clean the dust falling on the force-bearing plate 21, so that the force-bearing plate 21 can fit tightly with the bottom of the baffle 10.

[0026] As an embodiment of the present invention, Figure 3 and Figure 4 as well as Figure 5As shown, the first moving module includes a base 13 fixedly mounted on the upper end of the upper panel 3, a slide groove 14 is provided on the upper end of the base 13, the slide groove 14 is slidably connected to the slide seat 15, a first chamber 17 and a second chamber 18 are provided inside the slide seat 15, the second chamber 18 is slidably connected to a limiting plate 19, the upper end of the limiting plate 19 is fixedly connected to a top block 20, the other end of the top block 20 passes through the slide seat 15 and is hinged to a force plate 21, a second return spring 26 is arranged between the inner 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, and 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, the second pulley 28 is fixed to the top of the first chamber 17, 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, the relationship between a, d and b satisfies: a>d>b, the diameter of the lower panel 1 and the upper panel 3 is f, the relationship between d and f satisfies: d≥f, the second moving module includes a first return spring 22 arranged between the inner wall of the slide groove 14 and the slide seat 15, the inner wall of the slide groove 14 is fixedly connected to one end of the first steel wire rope 23, the other end of the first steel wire rope 23 passes through the first chamber 17, the second chamber 18, the limit plate 19 and the top block 20 and extends to the first prestressed pipe pile 1 1, the outer side of the first steel wire rope 23 is provided with a first pulley 24 and a double guide pulley 25, the first pulley 24 is fixed to the top of the first chamber 17, and a baffle plate 16 is fixedly installed on one side of the slide seat 15, and the baffle plate 16 is clamped above the slide slot 14 to prevent dust from falling into the slide slot 14 and affecting the contraction effect. When the pile bearing capacity test needs to be installed, the lower panel 1, the jack 2 and the 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 clamped in the upper and lower panel grooves 7 of the lower seat plate 8, and then the first steel wire rope 23 is pulled, and the first steel wire rope 23 drives the load-bearing plate 21 at the upper end of the slide seat 15 to be inserted into the baffle 1 through the first pulley 24 and the double guide pulleys 25. 0, and it is necessary to make the force-bearing plate 21 hinged on the upper end of the top block 20 tilt in the direction in which the slide 15 can move, that is, tilt backward, and then pull the second steel wire rope 27, the second steel wire rope 27 drives the limit plate 19 to descend through the double guide pulleys 25 and the second pulley 28, and the limit plate 19 drives the force-bearing plate 21 hinged on the upper end of the top block 20 to descend through the top block 20, and as the force-bearing plate 21 descends, the inclined force-bearing plate 21 gradually balances horizontally under the obstruction of the slide 15, and finally release the first steel wire rope 23 to keep the second steel wire rope 27 taut, and the restoring force of the first return spring 22 drives the force-bearing plate 21 at the upper end of the slide 15 to return to the central position, so that the two ends of the force-bearing plate 21 can be evenly stressed, and then release the second steel wire rope 27,The restoring force of the second return spring 26 drives the force plate 21 to be closely attached to the bottom end of the baffle 10 on the inner side of the upper seat plate 9 through the limit plate 19 and the top block 20. Similarly, the first steel wire rope 23 is pulled and then released without keeping the second steel wire rope 27 taut, so that the force plate 21 can be restored to an inclined state, which is convenient for removal and is conducive to stably installing the force plate 21 from the top of the baffle 10 to the bottom end of the baffle 10. The overall force plate 21 has a higher strength and better force effect, which improves the stability of the bearing capacity test, and can be quickly disassembled and removed, which is convenient for recycling and reduces the test cost.

[0027] As an embodiment of the present invention, Figure 4 and Figure 7 as well as Figure 8As shown, the first jet module includes a first telescopic airbag 29 arranged between the inner bottom end of the second chamber 18 and the limit plate 19, the upper end of the first telescopic airbag 29 is fixedly connected to one end of a first air delivery pipe 30, the other end of the first air delivery pipe 30 passes through the limit 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, and the two side ends of the nozzle 31 rotate 360 ​​degrees to spray, so as to blow different positions on the upper end of the inclined force plate 21, and the second jet module includes a first telescopic airbag 29 arranged on the inner wall of the slide groove 14 and the slide seat 15, the second telescopic airbag 32 is fixedly connected to one end of the second air pipe 33, the other end of the second air pipe 33 passes through the limit plate 19 and is connected to the first air pipe 30, the first air pipe 30 and the second air pipe 33 are both provided with a one-way valve 34, the outer sides of the first telescopic airbag 29 and the second telescopic airbag 32 are both provided with an air inlet valve 35, when the second steel wire rope 27 drives the limit plate 19 to descend, the first telescopic airbag 29 is contracted by the pressure of the limit plate 19, and the first telescopic airbag 29 is contracted through the first air pipe 3 0 sends gas into the nozzle 31, and the nozzle 31 sprays and cleans the surface of the force-bearing plate 21. When the first steel wire rope 23 drives the slide 15 to move, the second telescopic airbag 32 is squeezed and contracted by the slide 15, and the gas in the second telescopic airbag 32 is sent to the nozzle 31 through the first gas delivery pipe 30 and the second gas delivery pipe 33. The nozzle 31 sprays and cleans the surface of the force-bearing plate 21, and the one-way valve 34 can prevent the gas from flowing back. Finally, the restoring forces 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 32 to move. The inflatable airbag 29 is extended so that the first and second inflatable airbags 29 and 32 can inhale gas for replenishment through the air inlet valve 35, which is beneficial to utilizing the working process of the first movable module and the second movable module to provide the nozzle 31 with gas for cleaning the dust on the force-bearing plate 21, so that the force-bearing plate 21 can fit tightly with the bottom of the baffle 10 to prevent dust from affecting the stability of the force, and the first movable module and the second movable module can both provide gas for the nozzle 31, which is convenient for increasing the gas supply source of the nozzle 31, improving the stability of the gas supply, and further improving the cleaning effect.

[0028] Working principle: When the pile bearing capacity test needs to be installed, first, the lower panel 1, the jack 2 and the upper panel 3 are hoisted as a whole into the first prestressed pile 11 and the second prestressed pile 12, so that the lower panel 1 is clamped in the upper and lower panel grooves 7 of the lower seat plate 8, and then the first steel wire rope 23 is pulled. The first steel wire rope 23 drives the load-bearing plate 21 at the upper end of the slide 15 to be inserted into the bottom end of the baffle 10 through the first pulley 24 and the double guide pulleys 25, and the load-bearing plate 21 hinged at the upper end of the top block 20 needs to be tilted in the direction in which the slide 15 can move, that is, tilted backward, and then the second steel wire rope 27 is pulled. The second steel wire rope 27 drives the limit plate 19 to descend through the double guide pulleys 25 and the second pulley 28, and the limit plate 19 passes through the top block 20 drives the force-bearing plate 21 hinged on the upper end of the top block 20 to descend, and as the force-bearing plate 21 descends, the inclined force-bearing plate 21 gradually balances horizontally under the obstruction of the slide 15, and finally the first steel wire rope 23 is successively loosened to keep the second steel wire rope 27 taut, and the restoring force of the first return spring 22 drives the force-bearing plate 21 at the upper end of the slide 15 to return to the central position, so that the two ends of the force-bearing plate 21 can be evenly stressed, and then the second steel wire rope 27 is loosened, and the restoring force of the second return spring 26 drives the force-bearing plate 21 to be closely attached to the bottom end of the baffle 10 on the inner side of the upper seat plate 9 through the limit plate 19 and the top block 20. Similarly, after pulling the first steel wire rope 23, loosening it without keeping the second steel wire rope 27 taut can restore the inclined state of the force-bearing plate 21, which is convenient for removal; When the second steel wire 27 drives the limit plate 19 to descend, the first telescopic airbag 29 contracts due to the pressure of the limit plate 19, and the first telescopic airbag 29 delivers gas into the nozzle 31 through the first air pipe 30, and the nozzle 31 sprays and cleans the surface of the force-bearing plate 21. When the first steel wire 23 drives the slide 15 to move, the second telescopic airbag 32 is squeezed and contracted by the slide 15, and the gas in the second telescopic airbag 32 is delivered to the nozzle 31 through the first air pipe 30 and the second air pipe 33, and the nozzle 31 sprays and cleans the surface of the force-bearing plate 21, and 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 respectively 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 inhale gas through the intake valve 35 for replenishment.

[0029] It should be understood by those skilled in the art that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0030] The present invention is intended to cover all such substitutions, modifications and changes that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A prestressed pipe pile bearing capacity testing device, comprising a lower panel (1), a jack (2) being arranged at the upper end of the lower panel (1), an upper panel (3) being arranged at the upper end of the jack (2), two groups of displacement rods (4) being fixedly mounted at the upper ends of the lower panel (1) and the upper panel (3), a displacement sensor (5) being arranged at the upper end of the displacement rod (4), and the displacement sensor (5) being fixedly mounted at the bottom end of a reference beam (6), characterized in that: The testing device comprises a positioning mechanism and a cleaning mechanism, wherein the positioning mechanism further comprises a first moving module and a second moving module, wherein the first moving module can control the force plate (21) to be raised and lowered at the upper end of the first prestressed pipe pile (11), and the second moving module can control the force plate (21) to be horizontally moved at the upper end of the first prestressed pipe pile (11), and the second moving module cooperates with the first moving module to stably install the force plate (21) having a length greater than the inner diameter of the baffle (10) from above the upper seat plate (9) to the bottom of the baffle (10), so that the bearing capacity test can be performed with more stable force through the force plate (21); The cleaning mechanism comprises a first jet module and a second jet module, the second jet module cooperates with the first jet module so that the operation of the first movable module and the second movable module can provide blowing gas for the nozzle (31), thereby fully cleaning the dust that has fallen onto the force-bearing plate (21), so that the force-bearing plate (21) can fit tightly with the bottom of the baffle (10).

2. A prestressed pipe pile bearing capacity testing device according to claim 1, characterized in that: The first movable module comprises a base (13) fixedly mounted on the upper end of the upper panel (3); the base (13) is slidably connected to a slide seat (15) via a slide groove (14); the slide seat (15) is slidably connected to a limit plate (19) via a second chamber (18) provided inside; the upper end of the limit plate (19) is fixedly connected to a top block (20); the other end of the top block (20) passes through the slide seat (15) and is hinged to a force-bearing plate (21).

3. A prestressed pipe pile bearing capacity testing device according to claim 2, characterized in that: A second return spring (26) is provided between the second chamber (18) and the limit plate (19); one end of a second steel wire rope (27) is fixedly connected to the bottom end of the limit plate (19); the other end of the second steel wire rope (27) passes through the limit 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 second steel wire rope (27).

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

5. A prestressed pipe pile bearing capacity testing device according to claim 2, characterized in that: The second movable module comprises a first return spring (22) arranged between the slide groove (14) and the slide seat (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) passes through the first chamber (17), the second chamber (18), the limit plate (19) and the top block (20) and extends to the upper end of the first prestressed pipe pile (11); and a first pulley (24) and a double guide pulley (25) are attached to the outer side of the first steel wire rope (23).

6. A prestressed pipe pile bearing capacity testing device according to claim 5, characterized in that: A shielding plate (16) is fixedly mounted on one side of the slide seat (15), and the shielding plate (16) is clamped above the slide groove (14).

7. A prestressed pipe pile bearing capacity testing device according to claim 3, characterized in that: The first jet module comprises a first telescopic airbag (29) arranged 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 a first air supply pipe (30); 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).

8. A prestressed pipe pile bearing capacity testing device according to claim 7, characterized in that: The nozzle (31) is fixedly mounted on the upper end of the top block (20), and the two side ends of the nozzle (31) rotate 360 ​​degrees to spray air, thereby being able to blow air at different positions on the upper end of the tilted force-bearing plate (21).

9. A prestressed pipe pile bearing capacity testing device according to claim 7, characterized in that: The second jet module comprises a second telescopic airbag (32) arranged between the inner wall of the slide groove (14) and the slide seat (15), the second telescopic airbag (32) being fixedly connected to one end of a second air supply pipe (33), the other end of the second air supply pipe (33) passing through the limit plate (19) and being connected to the first air supply pipe (30).

10. A prestressed pipe pile bearing capacity testing device according to claim 9, characterized in that: Both the first air delivery pipe (30) and the second air delivery pipe (33) are provided with a one-way valve (34), and both the outer sides of the second telescopic airbag (32) and the first telescopic airbag (29) are provided with an air intake valve (35).

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