A flexural test device for prestressed hollow piles in soft soil layer geology

Abstract

The present invention provides a prestressed hollow pile bending test device for soft soil geological soil, comprising a test base, a first support assembly, a pressure assembly, two second support assemblies and two displacement assemblies, wherein the first support assembly is used to support the hollow pile body. The present invention uses the displacement assembly to move the second support assembly to an open space outside the test base in a first direction, and then uses an external lifting device to set up the hollow pile body on the second support assembly, and then uses the displacement assembly to synchronously move the second support assembly and the hollow pile body to the top of the test base, and supports the moved hollow pile body by the first support assembly, so that the hollow pile body is first received in an open position beside the test base, and then the received hollow pile body is smoothly moved between the pressure assembly and the test base, avoiding collision between the hollow pile body and the pressure assembly and the test base.

Description

Technical Field

[0001] The present invention belongs to the field of flexural strength testing of hollow piles, and particularly relates to a flexural strength testing device for prestressed hollow piles in soft soil layers of geological soil. Background Art

[0002] The function of prestressed concrete piles in soft soil layers of geological soil is mainly reflected in improving the bearing capacity of the foundation and reducing settlement. The prestressed concrete pipe piles can provide effective support in soft soil foundations through their high strength and rigidity, significantly improving the bearing capacity of the foundation and reducing settlement.

[0003] In order to ensure the quality of prestressed concrete piles, the flexural strength testing of prestressed concrete piles is carried out to evaluate the performance of the piles under bending loads, ensuring their structural safety and durability. Through the flexural strength testing, the bearing capacity, deformation characteristics and crack development of the piles can be evaluated, so as to judge their structural safety, timely discover potential safety hazards and take corresponding reinforcement measures.

[0004] For the flexural strength testing technology of prestressed concrete piles, the prestressed hollow piles are erected on the testing base, and then a pressure is applied to the top of the prestressed hollow piles through a pressing mechanism. Specifically, during the process of erecting the prestressed concrete piles on the testing base, the prestressed concrete piles are lifted and then horizontally moved between the pressing mechanism and the testing base, and manual observation and command are carried out. However, during the process of lifting and horizontally moving the prestressed concrete piles onto the testing base, the space between the pressing mechanism and the testing base is limited, and the horizontal movement of the prestressed concrete piles will be restricted by the space and is prone to collision. Summary of the Invention

[0005] In view of this, the present invention aims to provide a flexural strength testing device for prestressed hollow piles in soft soil layers of geological soil to solve the problem that during the process of lifting and horizontally moving the prestressed concrete piles onto the testing base, the space between the pressing mechanism and the testing base is limited, and the horizontal movement of the prestressed concrete piles will be restricted by the space and is prone to collision.

[0006] To achieve the above object, the technical solution of the present invention is realized as follows:

[0007] A bending resistance testing device for prestressed hollow piles in soft soil geological soil is provided, including a testing base, and further including a first support assembly, a pressing assembly, two second support assemblies and two displacement assemblies. The first support assembly is arranged on the top of the testing base and is used to support the hollow pile body. The pressing assembly is located above the first support assembly and is used to press the hollow pile body supported by the first support assembly on the testing base. The two second support assemblies are arranged on both sides of the first support assembly and are symmetrically arranged. The two displacement assemblies are located at the side walls of the testing base and are used to adjust the positions of the two second support assemblies respectively. When receiving the hollow pile body, the displacement assembly moves the second support assembly outside the testing base. During the feeding process, the displacement assembly moves the second support assembly supporting the hollow pile body to the top of the testing base.

[0008] Further, the pressing assembly includes a support frame which is fixedly connected to the side wall of the testing base and has a hydraulic cylinder at the top. The bottom end of the hydraulic rod of the hydraulic cylinder is fixedly connected with a pressure sensor, and the bottom end of the pressure sensor is fixedly connected with a pressing head.

[0009] Further, the pressing assembly further includes a lapping cavity and a support rod. The lapping cavity is opened at the end of the support frame, and a lapping edge is fixedly connected inside the lapping cavity. The support rod is rotatably connected to the top edge of the testing base. The support rod passes through the lapping cavity. The top end of the support rod has a threaded surface, and two fastening nuts are threadedly connected to the threaded surface. The two fastening nuts are respectively in contact with the top and bottom of the lapping edge.

[0010] Further, the first support assembly includes two first support platforms which are fixedly connected to the top of the testing base and are on both sides of the support frame.

[0011] Further, the second support assembly includes a moving platform. An insertion cavity is opened at the top of the moving platform, and a second support platform is slidably inserted into the insertion cavity. A height adjustment assembly is arranged at the bottom of the second support platform.

[0012] Further, the height adjustment assembly includes two linkage plates and a traction plate. The two linkage plates are fixedly connected to the bottom of the second support platform. Traction grooves are opened on both of the two linkage plates. The traction groove includes a first horizontal groove, a first inclined groove and a second horizontal groove. The first end of the traction plate passes through the end of the moving platform and extends into the insertion cavity. A traction pin is fixedly connected to the first end of the traction plate, and the traction pin is slidably inserted into the second horizontal groove. A threaded driving assembly is arranged on the side of the second end of the traction plate and is used to threadedly drive the traction plate to retract into the insertion cavity.

[0013] Further, the screw drive assembly includes a first motor fixedly connected to the end of the moving table. A first screw rod is fixedly connected to the output end of the first motor. A moving screw sleeve is threadedly connected to the surface of the first screw rod. The moving screw sleeve is fixedly connected to the side wall of the traction plate.

[0014] Further, a connecting frame is provided at the top of the second end of the traction plate. A limit pin is fixedly connected to the top end of the connecting frame. Plugging plates are fixedly connected to both sides of the connecting frame. Two positioning rods are plugged on each of the two plugging plates. First support springs are sleeved on the surfaces of the four positioning rods. Two ends of each first support spring are respectively fixedly connected to the plugging plate and the top end of the positioning rod.

[0015] Further, the displacement assembly includes two slide rails and a second motor. The two slide rails are fixed to the top of the test base. Limit plates are fixedly connected to the bottoms of the two slide rails. The two limit plates are located on both sides of the test base. Two positioning bolts are plugged on the side walls of the limit plates. The four positioning bolts are all threadedly connected to the side wall of the test base. The bottom of the moving table is slidably connected to the surfaces of the two slide rails;

[0016] The second motor is fixedly connected to the surface of one of the limit plates. A second screw rod is fixedly connected to the output end of the second motor. A driving screw sleeve is threadedly connected to the surface of the second screw rod. The driving screw sleeve is fixedly connected to the surface of the moving table. The end of the second screw rod is rotatably connected to a fixed frame. The fixed frame is fixedly connected to the ends of the two slide rails.

[0017] Further, both sides of the second support table have slope surfaces. Support shafts are rotatably connected to the two slope surfaces. Protective baffles are fixedly connected to the surfaces of the two support shafts. The two protective baffles are symmetrically arranged. Limit blocks are fixedly connected to the two slope surfaces. The ends of the two limit blocks respectively contact and support the surfaces of the protective baffles;

[0018] Gears are fixedly connected to the ends of the two support shafts. Linkage racks are engaged with the bottoms of the two gears. The two linkage racks are symmetrically arranged. A moving plate is fixedly connected to the bottom of the linkage rack. The moving plate is slidably arranged on the top of the moving table. Air springs are fixedly connected between the two moving plates and the moving table. Guide slopes are provided at the positions of the two pairs of the moving plates;

[0019] Two connecting rods are slidably plugged on the surface of the connecting frame. A pushing block is fixedly connected to the ends of the two connecting rods. Second support springs are sleeved on the surfaces of the two connecting rods. Two ends of each second support spring are respectively fixedly connected to the connecting frame and the pushing block.

[0020] Compared with the prior art, the prestressed hollow pile bending resistance testing device for soft soil layer geological soil of the present invention has the following advantages:

[0021] During the installation of the hollow pile body before testing with the prestressed hollow pile bending resistance testing device for soft soil layer geological soil of the present invention, first, the second support assembly is moved to the open space outside the test base in the first direction through the displacement assembly, and then the hollow pile body is erected on the second support assembly through an external hoisting device. Then, the second support assembly and the hollow pile body are synchronously moved to the top of the test base through the displacement assembly, and the moved hollow pile body is supported by the first support assembly, realizing the reception of the hollow pile body at an empty position beside the test base first, and then the received hollow pile body is smoothly moved between the pressure application assembly and the test base, avoiding the collision of the hollow pile body with the pressure application assembly and the test base.

[0022] The prestressed hollow pile bending resistance testing device for soft soil layer geological soil of the present invention

[0023] The threaded drive assembly drives the traction plate to move outward from the insertion cavity through threading. The traction plate will synchronously drive the traction pin to move. The traction pin will first move from the first horizontal groove to the first inclined groove. During the movement of the traction pin in the first inclined groove, the traction plate will move into the insertion cavity, synchronously driving the second support platform to lower its height. The hollow pile body will seat on the top of the first support platform as the second support platform descends, realizing that during the process of canceling the support of the second support assembly for the hollow pile body, the hollow pile body is automatically placed on the first support platform, completing the installation of the hollow pile body on the test base.

[0024] After the hollow pile body is hoisted onto the lap groove at the top of the second support platform, the threaded drive assembly drives the traction plate to retract into the insertion cavity through threading. The traction pin will first move in the second horizontal groove. During the movement of the traction pin in the second horizontal groove, the connecting frame will drive the limit pin to insert into the opening at the end of the hollow pile body. When the traction pin passes through the first inclined groove, it will push the traction plate to rise. During the process of the traction plate driving the second support platform to rise, the connecting frame continues to drive the limit pin to extend into the interior of the hollow pile body. Finally, after the traction pin moves into the first horizontal groove, the positioning is completed, so that the hollow pile body is clamped and positioned by the limit pin and the second support platform, which is beneficial to ensuring the stability of the hollow pile body during the subsequent lateral translation of the hollow pile body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0026] Figure 1 Schematic diagram of the first overall structure of a flexural test device for prestressed hollow piles in soft soil layer geological soil according to an embodiment of the present invention;

[0027] Figure 2 For Figure 1 Enlarged view of part A in;

[0028] Figure 3 Schematic diagram of the displacement component of a flexural test device for prestressed hollow piles in soft soil layer geological soil according to an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the traction plate, connecting frame and limit pin of a flexural test device for prestressed hollow piles in soft soil layer geological soil according to an embodiment of the present invention;

[0030] Figure 5 Schematic diagram of the moving platform of a flexural test device for prestressed hollow piles in soft soil layer geological soil according to an embodiment of the present invention;

[0031] Figure 6 Structural sectional view of the moving platform of a flexural test device for prestressed hollow piles in soft soil layer geological soil according to an embodiment of the present invention;

[0032] Figure 7 For Figure 6 Enlarged view of part B in;

[0033] Figure 8 Schematic diagram of the second support platform and linkage plate of a flexural test device for prestressed hollow piles in soft soil layer geological soil according to an embodiment of the present invention;

[0034] Figure 9 Schematic diagram of the second overall structure of a flexural test device for prestressed hollow piles in soft soil layer geological soil according to an embodiment of the present invention;

[0035] Figure 10 Schematic diagram of the support frame, hydraulic cylinder and pressing head of a flexural test device for prestressed hollow piles in soft soil layer geological soil according to an embodiment of the present invention;

[0036] Figure 11 Schematic diagram of the support rod of a flexural test device for prestressed hollow piles in soft soil layer geological soil according to an embodiment of the present invention.

[0037] Explanation of reference numerals:

[0038] 1 - Test base; 2 - Support frame; 3 - Hydraulic cylinder; 4 - Pressure sensor; 5 - Pressing head; 6 - Lapping cavity; 7 - Support rod; 8 - Tightening nut; 9 - Lapping edge; 10 - First support platform; 11 - Second support platform; 12 - Moving platform; 120 - Insertion cavity; 13 - Linkage plate; 14 - Traction plate; 15 - Traction groove; 1501 - First horizontal groove; 1502 - First inclined groove; 1503 - Second horizontal groove; 16 - Traction pin; 17 - First motor; 18 - First screw rod; 19 - Moving screw sleeve; 20 - Connecting frame; 21 - Limit pin; 22 - Insertion plate; 23 - Positioning rod; First 24 - Support spring; 25 - Slide rail; 26 - Second motor; 27 - Limit plate; 28 - Positioning bolt; 29 - Second screw rod; 2901 - Fixed frame; 30 - Driving screw sleeve; 31 - Support shaft; 32 - Protective baffle; 33 - Limit stop block; 34 - Gear; 35 - Linkage rack; 36 - Moving plate; 3601 - Guiding inclined plane; 37 - Gas spring; 38 - Connecting rod; 39 - Pushing block; 40 - Second support spring; 41 - Hollow pile body; a - First direction. Detailed implementation manner

[0039] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0040] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0042] For a better understanding of the following embodiments, the following explanations are made: The hollow pile body 41 mentioned in the embodiments is a prestressed concrete pile in actual application.

[0043] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0044] As Figures 1 to 11 shown, in one embodiment, a flexural test device for prestressed hollow piles in soft soil layer geology includes a test base 1, and further includes a first support assembly, a pressing assembly, two second support assemblies, and two displacement assemblies. The first support assembly is arranged on the top of the test base 1, and the first support assembly is used to support the hollow pile body 41. The pressing assembly is located above the first support assembly, and the pressing assembly is used to apply pressure to the hollow pile body 41 supported by the first support assembly on the test base 1. The two second support assemblies are arranged on both sides of the first support assembly and are symmetrically arranged. The two displacement assemblies are located at the side walls of the test base 1, and the two displacement assemblies are used to adjust the positions of the two second support assemblies respectively. When receiving the hollow pile body 41, the displacement assembly moves the second support assembly outside the test base 1. During the feeding process, the displacement assembly moves the second support assembly supporting the hollow pile body 41 to the top of the test base 1.

[0045] It should be understood that during the installation of the hollow pile body 41 before the test, first, the second support assembly is moved to the open space outside the test base 1 in the first direction a through the displacement assembly, and then the hollow pile body 41 is erected on the second support assembly through an external hoisting device. Then, the second support assembly and the hollow pile body 41 are synchronously moved to the top of the test base 1 through the displacement assembly, and the moved hollow pile body 41 is supported by the first support assembly, realizing the reception of the hollow pile body 41 at an empty position beside the test base 1 first, and then smoothly moving the received hollow pile body 41 between the pressing assembly and the test base 1 to avoid the collision of the hollow pile body 41 with the pressing assembly and the test base 1.

[0046] As Figure 1 、 Figure 9 、 Figure 10 and Figure 11 shown, in one embodiment, the pressing assembly includes a support frame 2, the support frame 2 is fixedly connected to the side wall of the test base 1, and there is a hydraulic cylinder 3 at the top. The bottom end of the hydraulic rod of the hydraulic cylinder 3 is fixedly connected with a pressure sensor 4, and the bottom end of the pressure sensor 4 is fixedly connected with a pressing head 5.

[0047] The pressure application assembly further includes a lapping cavity 6 and a support rod 7. The lapping cavity 6 is opened at the end of the support frame 2. A lapping edge 9 is fixedly connected inside the lapping cavity 6. The support rod 7 is rotatably connected to the top edge of the test base 1. The support rod 7 passes through the lapping cavity 6. The top end of the support rod 7 has a threaded surface, and two fastening nuts 8 are threadedly connected to the threaded surface. The two fastening nuts 8 are respectively in contact with the top and bottom of the lapping edge 9.

[0048] Specifically, support legs are also fixedly connected to both sides of the side wall of the moving table 12. The bottom ends of the support legs are rotatably connected to support wheels 42.

[0049] It should be understood that after the hollow pile body 41 is supported on the first support assembly, the hollow pile body 41 is installed on the test base 1. The hydraulic cylinder 3 is started. The hydraulic cylinder 3 pushes the pressure sensor 4, and the pressure sensor 4 drives the pressure application head 5 to press on the surface of the hollow pile body 41. Then, the hydraulic cylinder 3 gradually applies pressure until the pressure value detected by the pressure sensor 4 meets the requirement, and the pressure application is stopped.

[0050] After the hollow pile body 41 is installed on the first support assembly, the support rod 7 is flipped so that the support rod 7 is inserted into the lapping cavity 6. Then, the two fastening nuts 8 are tightened so that the two fastening nuts 8 are in close contact with the top and bottom of the lapping edge 9 to achieve fixation, and further support of the support frame 2 by the support rod 7 is realized.

[0051] As Figures 1 to 9 shown, in one embodiment, the first support assembly includes two first support platforms 10. The two first support platforms 10 are fixedly connected to the top of the test base 1 and are on both sides of the support frame 2.

[0052] The second support assembly includes a moving table 12. An insertion cavity 1201 is opened at the top of the moving table 12. A second support platform 11 is slidably inserted into the insertion cavity 1201. A height adjustment assembly is arranged at the bottom of the second support platform 11.

[0053] The height adjustment assembly includes two linkage plates 13 and a traction plate 14. The two linkage plates 13 are fixedly connected to the bottom of the second support platform 11. Traction grooves 15 are opened on both of the two linkage plates 13. The traction groove 15 includes a first horizontal groove 1501, a first inclined groove 1502 and a second horizontal groove 1503. The first end of the traction plate 14 passes through the end of the moving table 12 and extends into the insertion cavity 1201. A traction pin 16 is fixedly connected to the first end of the traction plate 14. The traction pin 16 is slidably inserted into the second horizontal groove 1503. A threaded driving assembly is arranged on the side of the second end of the traction plate 14. The threaded driving assembly is used to threadedly drive the traction plate 14 to retract into the insertion cavity 1201.

[0054] The screw drive assembly includes a first motor 17 fixedly connected to the end of the moving platform 12. A first screw rod 18 is fixedly connected to the output end of the first motor 17. A moving screw sleeve 19 is threadedly connected to the surface of the first screw rod 18. The moving screw sleeve 19 is fixedly connected to the side wall of the traction plate 14.

[0055] Specifically, the tops of the second support platform 11 and the first support platform 10 both have lapping grooves.

[0056] It should be understood that after the second support assembly carrying the hollow pile body 41 is moved to the top of the test base 1 by the displacement assembly, the hollow pile body 41 is moved directly above the first support platform 10. Then, the support for the hollow pile body 41 is cancelled by the second support assembly, causing the hollow pile body 41 to seat on the tops of the two first support platforms 10, completing the installation of the hollow pile body 41 and preparing for the pressing operation. The specific method for the first support assembly to support the hollow pile body 41 whose support is cancelled by the second support assembly is as follows:

[0057] First, the displacement assembly moves the moving platform 12 from outside the test base 1 to the top of the test base 1, causing the hollow pile body 41 to be horizontally moved above the two first support platforms 10.

[0058] Then, the screw drive assembly drives the traction plate 14 to move outward from the insertion cavity 1201 by screw drive. The traction plate 14 will synchronously drive the traction pin 16 to move. The traction pin 16 will first move from the first horizontal groove 1501 into the first inclined groove 1502. During the movement of the traction pin 16 in the first inclined groove 1502, the linkage plate 13 will move into the insertion cavity 1201. The linkage plate 13 will synchronously drive the second support platform 11 to lower its height. The hollow pile body 41 will seat on the top of the first support platform 10 as the second support platform 11 descends, realizing that during the process of cancelling the support of the hollow pile body 41 by the second support assembly, the hollow pile body 41 is automatically placed on the first support platform 10, completing the installation of the hollow pile body 41 on the test base 1.

[0059] The specific process of the screw drive assembly driving the traction plate 14 is as follows: Start the first motor 17. The first motor 17 will drive the first screw rod 18 to rotate. The first screw rod 18 will drive the moving screw sleeve 19 to move by screw drive. The moving screw sleeve 19 will drive the traction plate 14 to move.

[0060] As Figure 4 shown, in one embodiment, a connecting frame 20 is provided at the top of the second end of the traction plate 14. A limit pin 21 is fixedly connected to the top end of the connecting frame 20. Plugging plates 22 are fixedly connected to both sides of the connecting frame 20. Two positioning rods 23 are plugged on each of the two plugging plates 22. First support springs 24 are sleeved on the surfaces of the four positioning rods 23. The two ends of the first support springs 24 are respectively fixedly connected to the plugging plates 22 and the top ends of the positioning rods 23.

[0061] It should be understood that after the hollow pile body 41 is hoisted into the lap joint groove at the top of the second support platform 11, the threaded driving assembly is used to drive the traction plate 14 to retract into the insertion cavity 1201 by threading. The traction pin 16 will first move in the second transverse groove 1503. During the movement of the traction pin 16 in the second transverse groove 1503, the connecting frame 20 will drive the limit pin 21 to insert into the opening at the end of the hollow pile body 41. During the process of the traction pin 16 passing through the first inclined groove 1502, it will push the traction plate 14 to rise. During the process of the traction plate 14 driving the second support platform 11 to rise, the connecting frame 20 continues to drive the limit pin 21 to extend into the interior of the hollow pile body 41. Finally, after the traction pin 16 moves into the first transverse groove 1501, the positioning is completed, so that the hollow pile body 41 is clamped and positioned by the limit pin 21 and the second support platform 11, which is beneficial to ensuring the stability of the hollow pile body 41 during the subsequent lateral translation of the hollow pile body 41.

[0062] As Figures 1 to 3 shown, in one embodiment, the displacement assembly includes two slide rails 25 and a second motor 26. The two slide rails 25 are fixed on the top of the test base 1. The bottoms of the two slide rails 25 are fixedly connected with limit plates 27. The two limit plates 27 are located on both sides of the test base 1. Two positioning bolts 28 are inserted into the side walls of the limit plates 27. All four positioning bolts 28 are threadedly connected with the side wall of the test base 1. The bottom of the moving platform 12 is slidably connected to the surfaces of the two slide rails 25;

[0063] The second motor 26 is fixedly connected to the surface of one of the limit plates 27. The output end of the second motor 26 is fixedly connected with a second screw rod 29. A driving nut 30 is threadedly connected to the surface of the second screw rod 29. The driving nut 30 is fixedly connected to the surface of the moving platform 12. The end of the second screw rod 29 is rotatably connected with a fixing frame 2901, and the fixing frame 2901 is fixedly connected to the ends of the two slide rails 25.

[0064] It should be understood that the specific method of moving the moving platform 12 through the displacement assembly is as follows:

[0065] First, the second motor 26 drives the second screw rod 29 to rotate. The second screw rod 29 threadedly drives the driving nut 30 to move in the first direction a. The driving nut 30 synchronously drives the moving platform 12 to move. The moving platform 12 drives the second support platform 11 to move outside the test base 1, away from between the test base 1 and the pressing assembly, so that the second support platform 11 is in an open space, which is convenient for placing the hollow pile body 41 on the second support platform 11;

[0066] Then, the traction plate 14 is driven by the threaded drive assembly to retract into the interior of the moving platform 12, and the connecting frame 20 is synchronously driven to move. The connecting frame 20 drives the limit pin 21 to insert into the opening at the end of the hollow pile body 41, and the hollow pile body 41 is clamped and limited by the limit pin 21 and the second support platform 11;

[0067] Finally, the second motor 26 drives the second screw rod 29 to change the rotation direction, and the threaded drive drives the drive sleeve 30 to reset. The drive sleeve 30 synchronously drives the moving platform 12 to move, and the moving platform 12 drives the second support platform 11 to move above the test base 1, so that the hollow pile body 41 is smoothly translated between the test base 1 and the pressing assembly.

[0068] As Figure 4 、 Figure 6 and Figure 7 shown, in one embodiment, both sides of the second support platform 11 have ramp surfaces. Support shafts 31 are rotatably connected to both ramp surfaces. Protective baffles 32 are fixedly connected to the surfaces of the two support shafts 31. The two protective baffles 32 are symmetrically arranged. Limit blocks 33 are fixedly connected to both ramp surfaces. The ends of the two limit blocks 33 contact and support the surfaces of the protective baffles 32;

[0069] Gears 34 are fixedly connected to the ends of the two support shafts 31. Linkage racks 35 are engaged with the bottoms of the two gears 34. The two linkage racks 35 are symmetrically arranged. A moving plate 36 is fixedly connected to the bottom of the linkage rack 35. The moving plate 36 is slidably arranged on the top of the moving platform 12. Air springs 37 are fixedly connected between the two moving plates 36 and the moving platform 12. Guide inclined surfaces 3601 are provided at the positions of the two pairs of the two moving plates 36;

[0070] Two connecting rods 38 are slidably inserted into the surface of the connecting frame 20. A pushing block 39 is fixedly connected to the ends of the two connecting rods 38. Second support springs 40 are sleeved on the surfaces of the two connecting rods 38. The two ends of the two second support springs 40 are fixedly connected to the connecting frame 20 and the pushing block 39 respectively.

[0071] It should be understood that during the process of hoisting and seating the hollow pile body 41 on the overlapping groove at the top of the second support platform 11, the two protective baffles 32 can play a protective role, can partition and support the hollow pile body 41 slipping from the second support platform 11, and prevent the hollow pile body 41 from directly slipping to the ground;

[0072] During the process that the connecting frame 20 drives the limit pin 21 to move and insert into the end opening of the hollow pile body 41, the connecting frame 20 synchronously drives the pushing block 39 to move. When the pushing block 39 pushes the guiding inclined surfaces 3601 at the ends of the two moving plates 36, the moving plates 36 will drive the linkage rack 35 to move under the push. The linkage rack 35 will drive the gear 34, the gear 34 will drive the support shaft 31 to rotate, and the support shaft 31 will drive the protective baffle 32 to flip until the two protective baffles 32 are clamped on both sides of the surface of the hollow pile body 41 to achieve further positioning;

[0073] After the moving platform 12 drives the hollow pile body 41 to horizontally move above the first support platform 10, the threaded driving assembly drives the traction plate 14 to move and gradually extend out of the insertion cavity 1201. During the process that the traction plate 14 drives the limit pin 21 to gradually pull out of the hollow pile body 41 through the connecting frame 20, the pushing block 39 will be driven away from the moving plate 36. During the process that the pushing block 39 moves away from the moving plate 36, the gas spring 37 will push the linkage rack 35 to reset. The linkage rack 35 will drive the gear 34 to rotate, and the gear 34 will drive the protective baffle 32 to stick to the limit stop block 33 through the support shaft 31 to restore the protective state, which is beneficial to prevent the hollow pile body 41 sliding off the first support platform 10 from being blocked and protected.

[0074] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A bending resistance test device for prestressed hollow piles in soft soil layer geology, comprising a test base, characterized in that: It further includes a first support component, a pressing component, two second support components and two displacement components. The first support component is arranged on the top of the test base, and the first support component is used to support the hollow pile body. The pressing component is located above the first support component, and the pressing component is used to press the hollow pile body supported by the first support component on the test base. The two second support components are arranged on both sides of the first support component and are symmetrically arranged. The two displacement components are located at the side wall of the test base, and the two displacement components are used to adjust the positions of the two second support components respectively. When receiving the hollow pile body, the displacement component moves the second support component out of the test base. During the feeding process, the displacement component moves the second support component supporting the hollow pile body to the top of the test base; The second support component includes a moving table, and a plugging cavity is formed on the top of the moving table. A second support table is slidably plugged inside the plugging cavity, and a height adjustment component is arranged at the bottom of the second support table; The height adjustment component includes two linkage plates and a traction plate. The two linkage plates are fixedly connected to the bottom of the second support table. Traction grooves are formed on both of the two linkage plates. The traction groove includes a first horizontal groove, a first inclined groove and a second horizontal groove. The first end of the traction plate penetrates through the end of the moving table and then extends into the plugging cavity. A traction pin is fixedly connected to the first end of the traction plate, and the traction pin is slidably plugged inside the second horizontal groove. A threaded driving component is arranged on the side of the second end of the traction plate, and the threaded driving component is used to drive the traction plate to retract into the plugging cavity by threading; A connecting frame is arranged at the top of the second end of the traction plate. A limiting pin is fixedly connected to the top end of the connecting frame. Plugging plates are fixedly connected to both sides of the connecting frame. Two positioning rods are plugged on each of the two plugging plates. First support springs are sleeved on the surfaces of the four positioning rods, and the two ends of the first support spring are respectively fixedly connected to the plugging plate and the top end of the positioning rod.

2. The prestressed hollow pile bending resistance testing device for soft soil layer geology soil according to claim 1, characterized in that: The pressing component includes a support frame, the support frame is fixedly connected to the side wall of the test base, and there is a hydraulic cylinder at the top. The bottom end of the hydraulic rod of the hydraulic cylinder is fixedly connected with a pressure sensor, and the bottom end of the pressure sensor is fixedly connected with a pressing head.

3. A bending resistance testing device for prestressed hollow piles in soft soil layer geological soil according to claim 2, characterized in that: The pressing component further includes a lapping cavity and a support rod. The lapping cavity is formed at the end of the support frame. A lapping edge is fixedly connected inside the lapping cavity. The support rod is rotatably connected to the top edge of the test base. The support rod passes through the lapping cavity. The top end of the support rod has a threaded surface, and two fastening nuts are threadedly connected to the threaded surface. The two fastening nuts are respectively in contact with the top and bottom of the lapping edge.

4. A flexural test device for prestressed hollow piles in soft soil layer geological soil according to any one of claims 1 to 3, characterized in that: The first support component includes two first support tables, and the two first support tables are fixedly connected to the top of the test base and are located on both sides of the support frame.

5. A flexural test device for prestressed hollow piles in soft soil layer geology, characterized in that: The screw drive assembly includes a first motor fixedly connected to the end of the moving table. A first screw is fixedly connected to the output end of the first motor. A moving nut is threadedly connected to the surface of the first screw, and the moving nut is fixedly connected to the side wall of the traction plate.

6. The prestressed hollow pile flexural test device for soft soil layer geology according to claim 5, characterized in that: The displacement assembly includes two slide rails and a second motor. The two slide rails are fixed to the top of the test base. The bottoms of the two slide rails are fixedly connected with limit plates. The two limit plates are located on both sides of the test base. Two positioning bolts are inserted into the side walls of the limit plates, and all four positioning bolts are threadedly connected to the side wall of the test base. The bottom of the moving table is slidably connected to the surfaces of the two slide rails; The second motor is fixedly connected to the surface of one of the limit plates. A second screw is fixedly connected to the output end of the second motor. A driving nut is threadedly connected to the surface of the second screw, and the driving nut is fixedly connected to the surface of the moving table. The end of the second screw is rotatably connected to a fixing bracket, and the fixing bracket is fixedly connected to the ends of the two slide rails.

7. A bending resistance testing device for prestressed hollow piles in soft soil layer geological soil according to claim 6, characterized in that: Both sides of the second support table have slope surfaces. Support shafts are rotatably connected to the two slope surfaces. Protective baffles are fixedly connected to the surfaces of the two support shafts. The two protective baffles are symmetrically arranged. Limit blocks are fixedly connected to the two slope surfaces. The ends of the two limit blocks contact and support the surfaces of the protective baffles; Gears are fixedly connected to the ends of the two support shafts. Linkage racks are engaged with the bottoms of the two gears. The two linkage racks are symmetrically arranged. A moving plate is fixedly connected to the bottom of the linkage rack. The moving plate is slidably arranged on the top of the moving table. Gas springs are fixedly connected between the two moving plates and the moving table. Guide slopes are provided at the positions of the two pairs of the two moving plates; Two connecting rods are slidably inserted into the surface of the connecting frame. Push blocks are fixedly connected to the ends of the two connecting rods. Second support springs are sleeved on the surfaces of the two connecting rods. The two ends of the two second support springs are fixedly connected to the connecting frame and the push blocks respectively.

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