Prestressed hollow pile bending resistance testing device for soft soil layer geological soil

Abstract

The invention provides a bending resistance testing device for a prestressed hollow pile for soft soil layer geological soil, which comprises a testing base, and further comprises a first supporting assembly, a pressure applying assembly, two second supporting assemblies and two displacement assemblies, and the first supporting assembly is used for supporting a hollow pile body. The second supporting assembly is moved to an open space outside the test base according to the first direction through the displacement assembly, then the hollow pile body is erected on the second supporting assembly through the external hoisting equipment, and then the second supporting assembly and the hollow pile body are synchronously moved to the top of the test base through the displacement assembly. The first supporting assembly is used for supporting the moved hollow pile body, the hollow pile body is supported at an open position beside the testing base, then the supported hollow pile body is stably moved to the position between the pressure applying assembly and the testing base, and collision between the hollow pile body and the pressure applying assembly and between the hollow pile body and the testing base is avoided.

Description

Technical Field

[0001] The invention belongs to the field of hollow pile bending resistance testing, and in particular relates to a prestressed hollow pile bending resistance testing device for soft soil geological soil. Background Art

[0002] The role of prestressed concrete piles in soft soil geology is mainly reflected in improving the bearing capacity of the foundation and reducing settlement. 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 prestressed concrete pile bending test is used to evaluate the performance of the piles under bending loads to ensure their structural safety and durability. The bending test can evaluate the bearing capacity, deformation characteristics and crack development of the piles, thereby judging their structural safety, discovering potential safety hazards in a timely manner, and taking corresponding reinforcement measures.

[0004] The prestressed concrete pile bending test technology is to set up the prestressed hollow pile on the test base, and then apply pressure to the top of the prestressed hollow pile through a pressure mechanism. Specifically, in the process of setting up the prestressed concrete pile on the test base, the prestressed concrete pile is lifted and then moved horizontally between the pressure mechanism and the test base for manual observation and command. However, in the process of the prestressed concrete pile being lifted and moved horizontally to the test base, the space between the pressure mechanism and the test base is limited, and the lateral movement of the prestressed concrete pile will be restricted by the space, which is prone to collision. Summary of the invention

[0005] In view of this, the present invention aims to propose a prestressed hollow pile bending test device for soft soil geological soil, so as to solve the problem that when the prestressed concrete pile is lifted and moved horizontally to the test base, the space between the pressure mechanism and the test base is limited, and the lateral movement of the prestressed concrete pile is restricted by the space and prone to collision.

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

[0007] Provided is 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 arranged on the top of the test base, the first support assembly is used to support the hollow pile body, the pressure assembly is located above the first support assembly, the pressure assembly is used to apply pressure to the hollow pile body supported by the first support assembly on the test 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 test base, the two displacement assemblies 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 to the outside of the test base, and during the loading process, the displacement assembly moves the second support assembly supporting the hollow pile body to the top of the test base.

[0008] Furthermore, the pressure-applying assembly includes a support frame, which is fixedly connected to the side wall of the test base and has a hydraulic cylinder on the top. The bottom end of the hydraulic rod of the hydraulic cylinder is fixedly connected to a pressure sensor, and the bottom end of the pressure sensor is fixedly connected to a pressure head.

[0009] Furthermore, the pressure-applying assembly also includes a lap joint cavity and a support rod, the lap joint cavity is opened at the end of the support frame, a lap joint edge is fixedly connected to the inside of the lap joint cavity, the support rod is rotatably connected to the top edge of the test base, the support rod passes through the lap joint cavity, the top end of the support rod has a threaded surface, two fastening nuts are threadedly connected to the threaded surface, and the two fastening nuts are respectively in contact with the top and bottom of the lap joint edge.

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

[0011] Furthermore, the second supporting assembly includes a moving platform, a plug-in cavity is provided on the top of the moving platform, a second supporting platform is slidably plugged into the interior of the plug-in cavity, and a height adjustment assembly is provided at the bottom of the second supporting platform.

[0012] Furthermore, 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 platform, and the two linkage plates are provided with traction grooves, and the traction grooves include a first transverse groove, a first oblique groove and a second transverse groove. The first end of the traction plate passes through the end of the movable platform and extends into the plug-in cavity. The first end of the traction plate is fixedly connected with a traction pin, and the traction pin is slidably plugged into the second transverse groove. A threaded drive assembly is provided on the side of the second end of the traction plate, and the threaded drive assembly is used to threadably drive the traction plate to retract into the plug-in cavity.

[0013] Furthermore, the threaded drive assembly includes a first motor, which is fixedly connected to the end of the movable platform, and a first screw is fixedly connected to the output end of the first motor, a movable screw sleeve is threadedly connected to the surface of the first screw, and the movable screw sleeve is fixedly connected to the side wall of the traction plate.

[0014] Furthermore, a connecting frame is provided on the top of the second end of the traction plate, and the top of the connecting frame is fixedly connected to a limiting pin. Plug-in plates are fixedly connected on both sides of the connecting frame, and two positioning rods are plugged into the two plug-in 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 plug-in plates and the top of the positioning rods.

[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, the bottoms of the two slide rails are fixedly connected to limit plates, the two limit plates are located on both sides of the test base, two positioning bolts are inserted on the side walls of the limit plates, the four positioning bolts are all threadedly connected to the side walls of the test base, and the bottom of the mobile platform 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, the output end of the second motor is fixedly connected to the second screw, the surface of the second screw is threadedly connected to a driving screw sleeve, the driving screw sleeve is fixedly connected to the surface of the movable platform, the end of the second screw is rotatably connected to a fixed frame, and the fixed frame is fixedly connected to the ends of the two slide rails.

[0017] Further, both sides of the second support platform have inclined surfaces, and the two inclined surfaces are rotatably connected to support shafts, and the surfaces of the two support shafts are fixedly connected to protective baffles, and the two protective baffles are symmetrically arranged, and the two inclined surfaces are fixedly connected to limit stops, and the ends of the two limit stops contact and support the surfaces of the protective baffles;

[0018] The ends of the two support shafts are fixedly connected with gears, the bottoms of the two gears are meshed with linkage racks, the two linkage racks are symmetrically arranged, the bottoms of the linkage racks are fixedly connected with a moving plate, the moving plate is slidably arranged on the top of the moving platform, the two moving plates are fixedly connected with gas springs between the moving platforms, and the two pairs of positions of the two moving plates are provided with guiding inclined surfaces;

[0019] Two connecting rods are slidably inserted on the surface of the connecting frame, and the ends of the two connecting rods are fixedly connected with pushing blocks. Second supporting springs are sleeved on the surfaces of the two connecting rods, and the two ends of the two second supporting springs are respectively fixedly connected to the connecting frame and the pushing block.

[0020] Compared with the prior art, the prestressed hollow pile bending test device for soft soil geological soil described in the present invention has the following advantages:

[0021] The present invention discloses a prestressed hollow pile bending resistance testing device for soft soil geological soil. During the installation of the hollow pile body before the test, the second support assembly is first moved in a first direction to an open space outside the test base by a displacement assembly. The hollow pile body is then erected on the second support assembly by an external lifting device. The second support assembly and the hollow pile body are then synchronously moved to the top of the test base by the displacement assembly. The moved hollow pile body is supported 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, thereby avoiding collision between the hollow pile body, the pressure assembly and the test base.

[0022] The present invention provides a prestressed hollow pile bending resistance testing device for soft soil geological soil.

[0023] The threaded drive assembly threadedly drives the traction plate to move toward the outside of the plug-in cavity, and the traction plate will synchronously drive the traction pin to move. The traction pin will first move from the first transverse groove to the first inclined groove. In the process of the traction pin moving in the first inclined groove, the traction plate will move toward the plug-in cavity, and synchronously drive the second support platform to descend in height. The hollow pile body will sit on the top of the first support platform as the second support platform descends, thereby automatically placing the hollow pile body on the first support platform in the process of canceling the support of the hollow pile body by the second support assembly, thereby completing the installation of the hollow pile body on the test base.

[0024] After the hollow pile body is hoisted into the lap groove at the top of the second supporting platform, the traction plate is driven by the threaded driving assembly to retract into the plug-in cavity, and the traction pin will move first in the second transverse groove. During the movement of the traction pin in the second transverse groove, the connecting frame will drive the limit pin to insert into the opening at the end of the hollow pile body. During the process of the traction pin passing through the first inclined groove, the traction plate will be pushed up. During the process of the traction plate driving the second supporting 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 transverse groove, the positioning is completed, so that the hollow pile body is clamped and positioned by the limit pin and the second supporting platform, which is beneficial to ensure the stability of the hollow pile body during the subsequent lateral translation of the hollow pile body. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 1 It is a first overall structural schematic diagram of a prestressed hollow pile bending resistance testing device for soft soil geological soil according to an embodiment of the present invention;

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

[0028] Figure 3 It is a structural schematic diagram of a displacement assembly of a prestressed hollow pile bending resistance testing device for soft soil geological soil according to an embodiment of the present invention;

[0029] Figure 4 It is a structural schematic diagram of a traction plate, a connecting frame and a limit pin of a prestressed hollow pile bending resistance testing device for soft soil geological soil according to an embodiment of the present invention;

[0030] Figure 5 A schematic structural diagram of a mobile platform of a prestressed hollow pile bending resistance testing device for soft soil geological soil according to an embodiment of the present invention;

[0031] Figure 6 A structural cross-sectional view of a mobile platform of a prestressed hollow pile bending resistance testing device for soft soil geological soil according to an embodiment of the present invention;

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

[0033] Figure 8 A schematic structural diagram of a second support platform and a linkage plate of a prestressed hollow pile bending resistance testing device for soft soil geological soil according to an embodiment of the present invention;

[0034] Fig. 9 A second overall structural schematic diagram of a prestressed hollow pile bending resistance testing device for soft soil geological soil according to an embodiment of the present invention;

[0035] Fig.10 This is a schematic structural diagram of a support frame, a hydraulic cylinder and a pressure head of a prestressed hollow pile bending resistance testing device for soft soil geological soil according to an embodiment of the present invention;

[0036] Fig.11 It is a schematic structural diagram of support rods of a prestressed hollow pile bending resistance testing device for soft soil geological soil according to an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 1-test base; 2-support frame; 3-hydraulic cylinder; 4-pressure sensor; 5-pressure head; 6-lap cavity; 7-support rod; 8-fastening nut; 9-lap 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 transverse groove; 1502-first inclined groove; 1503-second transverse groove; 16-traction pin; 17-first motor; 18-first screw rod; 19-moving screw sleeve; 20-connecting frame; 21 -limit pin; 22-plug-in plate; 23-positioning rod; first 24-support spring; 25-slide rail; 26-second motor; 27-limiting plate; 28-positioning bolt; 29-second screw; 2901-fixed frame; 30-driving screw sleeve; 31-support shaft; 32-protective baffle; 33-limiting block; 34-gear; 35-linked rack; 36-movable plate; 3601-guide ramp; 37-gas spring; 38-connecting rod; 39-pushing block; 40-second support spring; 41-hollow pile body; a-first direction. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0042] In order to better understand the following embodiments, the following explanation is given: 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 conjunction with embodiments.

[0044] like Figures 1 to 11 As shown, in one embodiment, a prestressed hollow pile bending test device for soft soil geological soil includes a test base 1, and also includes a first support assembly, a pressure 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 pressure assembly is located above the first support assembly. The pressure 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. 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 to the outside of the test base 1. During the loading 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, the second support assembly is first 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 the external lifting equipment, and 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, so that the hollow pile body 41 is first received in an open position beside the test base 1, and then the received hollow pile body 41 is smoothly moved between the pressure assembly and the test base 1, so as to avoid collision between the hollow pile body 41 and the pressure assembly and the test base 1.

[0046] like Figure 1 , Fig. 9 , Fig.10 and Fig.11 As shown, in one embodiment, the pressure-applying assembly includes a support frame 2, which is fixedly connected to the side wall of the test base 1 and has a hydraulic cylinder 3 on the top. The bottom end of the hydraulic rod of the hydraulic cylinder 3 is fixedly connected to a pressure sensor 4, and the bottom end of the pressure sensor 4 is fixedly connected to a pressure head 5.

[0047] The pressure-applying assembly also includes a lap joint cavity 6 and a support rod 7. The lap joint cavity 6 is opened at the end of the support frame 2. A lap joint edge 9 is fixedly connected inside the lap joint 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 lap joint 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 in contact with the top and bottom of the lap joint edge 9 respectively.

[0048] Specifically, the two sides of the side wall of the mobile platform 12 are also fixedly connected with support legs, and the bottom ends of the support legs are rotatably connected with 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 head 5 to press on the surface of the hollow pile body 41, and then, the hydraulic cylinder 3 gradually applies pressure until the pressure value detected by the pressure sensor 4 meets the requirement, and the pressure is stopped;

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

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

[0052] The second support assembly includes a moving platform 12, a plug-in cavity 1201 is provided on the top of the moving platform 12, a second support platform 11 is slidably plugged into the plug-in cavity 1201, and a height adjustment assembly is provided 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. The two linkage plates 13 are both provided with traction grooves 15. The traction grooves 15 include a first transverse groove 1501, a first oblique groove 1502, and a second transverse groove 1503. The first end of the traction plate 14 passes through the end of the moving platform 12 and then extends into the plug-in cavity 1201. The first end of the traction plate 14 is fixedly connected with a traction pin 16, which is slidably plugged into the second transverse groove 1503. The second end side of the traction plate 14 is provided with a threaded driving assembly, which is used to threadably drive the traction plate 14 to retract into the plug-in cavity 1201.

[0054] The screw drive assembly includes a first motor 17, the first motor 17 is fixedly connected to the end of the moving platform 12, the output end of the first motor 17 is fixedly connected to a first screw 18, the surface of the first screw 18 is threadedly connected to a moving screw sleeve 19, and 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 are provided with overlapping grooves;

[0056] It should be understood that after the second support assembly receiving 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 to the top of the first support platform 10, and then the support for the hollow pile body 41 is cancelled by the second support assembly, so that the hollow pile body 41 is seated on the top of the two first support platforms 10, and the installation of the hollow pile body 41 is completed, and preparations are made for the pressure application work. Specifically, the method of the first support assembly supporting the hollow pile body 41 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, so that the hollow pile body 41 moves horizontally to above the two first support platforms 10;

[0058] Then, the threaded driving assembly threadably drives the traction plate 14 to move toward the outside of the plug-in cavity 1201, and the traction plate 14 will synchronously drive the traction pin 16 to move. The traction pin 16 will first move from the first transverse groove 1501 to the first inclined groove 1502. In the process of the traction pin 16 moving in the first inclined groove 1502, the linkage plate 13 will move toward the plug-in cavity 1201, and the linkage plate 13 will synchronously drive the second support platform 11 to descend in height. The hollow pile body 41 will sit on the top of the first support platform 10 as the second support platform 11 descends, thereby automatically placing the hollow pile body 41 on the first support platform 10 in the process of canceling the support of the second support assembly for the hollow pile body 41, thereby completing the installation of the hollow pile body 41 on the test base 1.

[0059] The specific process of the threaded drive assembly driving the traction plate 14 is: start the first motor 17, the first motor 17 will drive the first screw 18 to rotate, the first screw 18 will threadably drive the moving screw sleeve 19 to move, and the moving screw sleeve 19 will drive the traction plate 14 to move.

[0060] like Figure 4 As shown, in one embodiment, a connecting frame 20 is provided on the top of the second end of the traction plate 14, and a limiting pin 21 is fixedly connected to the top of the connecting frame 20. Plug-in plates 22 are fixedly connected on both sides of the connecting frame 20. Two positioning rods 23 are plugged on the two plug-in plates 22. First support springs 24 are sleeved on the surfaces of the four positioning rods 23, and the two ends of the first support spring 24 are fixedly connected to the plug-in plates 22 and the tops of the positioning rods 23, respectively.

[0061] It should be understood that after the hollow pile body 41 is hoisted into the lap groove at the top of the second support platform 11, the traction plate 14 is threadedly driven by the threaded drive assembly to retract into the plug-in cavity 1201, and 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, the traction plate 14 will be pushed to be lifted. 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 ensure the stability of the hollow pile body 41 during the subsequent lateral translation of the hollow pile body 41.

[0062] like Figures 1 to 3 As 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 on the side walls of the limit plates 27, the four positioning bolts 28 are all threadedly connected to the side walls of the test base 1, and 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, and the output end of the second motor 26 is fixedly connected to the second screw 29, and the surface of the second screw 29 is threadedly connected to a driving screw sleeve 30, and the driving screw sleeve 30 is fixedly connected to the surface of the movable platform 12, and the end of the second screw 29 is rotatably connected to a fixed frame 2901, and the fixed 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 by the displacement assembly is as follows:

[0065] First, the second motor 26 drives the second screw 29 to rotate, and the second screw 29 drives the screw sleeve 30 to move in the first direction a, and the screw sleeve 30 drives the moving platform 12 to move synchronously, and 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 pressure assembly, so that the second support platform 11 is in an open space, which is convenient for the hollow pile body 41 to be seated on the second support platform 11;

[0066] Then, the traction plate 14 is driven to retract into the inside of the moving platform 12 by the threaded driving assembly, and the connecting frame 20 is driven to move synchronously, and the connecting frame 20 drives the limiting pin 21 to be inserted into the opening at the end of the hollow pile body 41, and the hollow pile body 41 is clamped and limited by the limiting pin 21 and the second supporting platform 11;

[0067] Finally, the second motor 26 drives the second screw 29 to change the rotation direction, the thread drive drives the screw sleeve 30 to reset, and the driving screw sleeve 30 drives the moving platform 12 to move synchronously. 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 moved horizontally between the test base 1 and the pressure assembly.

[0068] like Figure 4 , Figure 6 and Figure 7 As shown, in one embodiment, both sides of the second support platform 11 have sloped surfaces, and the two sloped surfaces are rotatably connected to the support shafts 31, and the surfaces of the two support shafts 31 are fixedly connected to the protection baffles 32, and the two protection baffles 32 are symmetrically arranged, and the two sloped surfaces are fixedly connected to the limited stoppers 33, and the ends of the two limited stoppers 33 contact and support the surfaces of the protection baffles 32;

[0069] The ends of the two support shafts 31 are fixedly connected with gears 34, the bottoms of the two gears 34 are meshed with linkage racks 35, the two linkage racks 35 are symmetrically arranged, the bottoms of the linkage racks 35 are fixedly connected with a moving plate 36, the moving plate 36 is slidably arranged on the top of the moving platform 12, the two moving plates 36 are fixedly connected with gas springs 37 between the moving platform 12, and the two pairs of the two moving plates 36 are provided with guiding inclined surfaces 3601;

[0070] Two connecting rods 38 are slidably inserted on the surface of the connecting frame 20, and the ends of the two connecting rods 38 are fixedly connected to push blocks 39. Second support springs 40 are sleeved on the surfaces of the two connecting rods 38, and the two ends of the two second support springs 40 are fixedly connected to the connecting frame 20 and the push blocks 39 respectively.

[0071] It should be understood that in the process of the hollow pile body 41 being hoisted and seated in the lap groove on the top of the second support platform 11, the two protective baffles 32 can play a protective role, and can block and support the hollow pile body 41 sliding off the second support platform 11, preventing the hollow pile body 41 from sliding directly to the ground;

[0072] In the process that the connection frame 20 drives the limit pin 21 to move and insert into the opening at the end of the hollow pile body 41, the connection frame 20 synchronously drives the push block 39 to move, and when the push block 39 pushes the guiding inclined surfaces 3601 at the ends of the two movable plates 36, the movable plate 36 drives the linkage rack 35 to move under the push, and the linkage rack 35 drives the gear 34, the gear 34 drives the support shaft 31 to rotate, and the support shaft 31 drives 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, so as to achieve further positioning;

[0073] After the moving platform 12 drives the hollow pile body 41 to move horizontally to above the first supporting platform 10, the threaded driving assembly drives the traction plate 14 to move and gradually extend out of the plug-in cavity 1201. During the process of the traction plate 14 driving the limit pin 21 to gradually pull out 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 of the pushing block 39 moving 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 block 33 through the supporting shaft 31, thereby restoring the protective state, which is conducive to preventing the hollow pile body 41 from sliding off the first supporting platform 10 for isolation and protection.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A prestressed hollow pile bending test device for soft soil geological soil, comprising a test base (1), characterized in that: The test base (1) further comprises a first support assembly, a pressure assembly, two second support assemblies and two displacement assemblies, wherein the first support assembly is arranged on the top of the test base (1), the first support assembly is used to support the hollow pile body (41), the pressure assembly is located above the first support assembly, the pressure 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), 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 to the outside of the test base (1), and during the loading process, the displacement assembly moves the second support assembly supporting the hollow pile body (41) to the top of the test base (1).

2. The prestressed hollow pile bending test device for soft soil geological soil according to claim 1 is characterized by: The pressure-applying assembly comprises a support frame (2), the support frame (2) being fixedly connected to the side wall of the test base (1), and having a hydraulic cylinder (3) on the top, the bottom end of the hydraulic rod of the hydraulic cylinder (3) being fixedly connected to a pressure sensor (4), and the bottom end of the pressure sensor (4) being fixedly connected to a pressure-applying head (5).

3. The prestressed hollow pile bending test device for soft soil geological soil according to claim 2 is characterized by: The pressure-applying assembly further comprises a lap joint cavity (6) and a support rod (7), wherein the lap joint cavity (6) is provided at the end of the support frame (2), a lap joint edge (9) is fixedly connected inside the lap joint 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 lap joint cavity (6), the top end of the support rod (7) has a threaded surface, two fastening nuts (8) are threadedly connected to the threaded surface, and the two fastening nuts (8) are in contact with the top and bottom of the lap joint edge (9) respectively.

4. A prestressed hollow pile bending test device for soft soil geological soil according to any one of claims 1 to 3, characterized in that: The first support assembly comprises two first support platforms (10), wherein the two first support platforms (10) are fixedly connected to the top of the test base (1) and are located on both sides of the support frame (2).

5. The prestressed hollow pile bending test device for soft soil geological soil according to claim 4 is characterized by: The second support assembly comprises a moving platform (12), a plug-in cavity (1201) is provided at the top of the moving platform (12), a second support platform (11) is slidably plugged into the interior of the plug-in cavity (1201), and a height adjustment assembly is provided at the bottom of the second support platform (11).

6. The prestressed hollow pile bending test device for soft soil geological soil according to claim 5 is characterized by: The height adjustment assembly comprises 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). The two linkage plates (13) are each provided with a traction groove (15). The traction groove (15) comprises a first transverse groove (1501), a first inclined groove (1502) and a second transverse groove (1503). The first end of the traction plate (14) passes through the end of the movable platform (12) and then extends into the insertion cavity (1201). The first end of the traction plate (14) is fixedly connected with a traction pin (16), and the traction pin (16) is slidably inserted into the second transverse groove (1503). A threaded drive assembly is provided on the side of the second end of the traction plate (14), and the threaded drive assembly is used to threadably drive the traction plate (14) to retract into the insertion cavity (1201).

7. The prestressed hollow pile bending test device for soft soil geological soil according to claim 6 is characterized by: The thread drive assembly comprises a first motor (17), the first motor (17) being fixedly connected to the end of the moving platform (12), the output end of the first motor (17) being fixedly connected to a first screw rod (18), a surface of the first screw rod (18) being threadedly connected to a moving screw sleeve (19), and the moving screw sleeve (19) being fixedly connected to the side wall of the traction plate (14).

8. The prestressed hollow pile bending test device for soft soil layer geological soil according to claim 7 is characterized in that: A connecting frame (20) is provided at the top of the second end of the traction plate (14), the top of the connecting frame (20) is fixedly connected to a limit pin (21), both sides of the connecting frame (20) are fixedly connected to plug-in boards (22), two positioning rods (23) are plugged into the two plug-in boards (22), the surfaces of the four positioning rods (23) are sleeved with first support springs (24), and the two ends of the first support springs (24) are respectively fixedly connected to the plug-in boards (22) and the tops of the positioning rods (23).

9. The prestressed hollow pile bending test device for soft soil geological soil according to claim 8, characterized in that: The displacement assembly comprises two slide rails (25) and a second motor (26), the two slide rails (25) being fixed to the top of the test base (1), the bottoms of the two slide rails (25) being fixedly connected to limit plates (27), the two limit plates (27) being located on both sides of the test base (1), two positioning bolts (28) being inserted into the side walls of the limit plates (27), the four positioning bolts (28) being all threadedly connected to the side walls of the test base (1), and the bottom of the moving platform (12) being slidably connected to the surfaces of the two slide rails (25); 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 to a second screw rod (29); a driving screw sleeve (30) is threadedly connected to the surface of the second screw rod (29); the driving screw sleeve (30) is fixedly connected to the surface of the moving platform (12); the end of the second screw rod (29) is rotatably connected to a fixing frame (2901); and the fixing frame (2901) is fixedly connected to the ends of the two slide rails (25).

10. The prestressed hollow pile bending test device for soft soil layer geological soil according to claim 9, characterized in that: Both sides of the second support platform (11) have inclined surfaces, the two inclined surfaces are rotatably connected to support shafts (31), the surfaces of the two support shafts (31) are fixedly connected to protective baffles (32), the two protective baffles (32) are symmetrically arranged, the two inclined surfaces are fixedly connected to limit stops (33), and the ends of the two limit stops (33) contact and support the surfaces of the protective baffles (32); The ends of the two support shafts (31) are fixedly connected to gears (34), the bottoms of the two gears (34) are meshed with linkage racks (35), the two linkage racks (35) are symmetrically arranged, the bottoms of the linkage racks (35) are fixedly connected to a moving plate (36), the moving plate (36) is slidably arranged on the top of the moving platform (12), the two moving plates (36) are fixedly connected to the moving platform (12) with gas springs (37), and the two pairs of the two moving plates (36) are provided with guiding inclined surfaces (3601); Two connecting rods (38) are slidably inserted on the surface of the connecting frame (20), and the ends of the two connecting rods (38) are fixedly connected to a pushing block (39). Second supporting springs (40) are sleeved on the surfaces of the two connecting rods (38), and the two ends of the two second supporting springs (40) are respectively fixedly connected to the connecting frame (20) and the pushing block (39).

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