Prestressed pipe pile automatic tensioning equipment

Abstract

The present invention belongs to the technical field of construction equipment, and relates to an automatic tensioning device for prestressed pipe piles. The automatic tensioning device for prestressed pipe piles of the present invention comprises a base, on which are installed a hydraulic station, a control machine, a mobile lifting platform, a tensioning machine floating device, a tensioning docking locking device, an automatic tightening device for oil cylinder nuts, and an automatic tightening device for pipe pile nuts; the mobile lifting platform can move forward and backward on the light rail of the base; the tensioning machine floating device is fixedly installed on the mobile lifting platform and can move up and down or hover; the automatic tightening device for oil cylinder nuts, the tensioning docking locking device, and the automatic tightening device for pipe pile nuts are all installed on the tensioning machine floating device, and can move forward and backward along the same center line. The present invention can automatically realize the prestressing of pipe piles, has a high degree of automation integration, and high docking accuracy, and can effectively reduce the probability of safety accidents and improve work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of construction equipment, in particular to a multi-model prestressed pipe pile automatic tensioning device. Background Art

[0002] Currently, concrete pipe piles, as a cement product, are widely used in various infrastructure projects. Prestressing is a key production step for concrete pipe piles. Its function is to apply prestress to the internal reinforcement cage before the concrete pipe pile is subjected to external loads. This improves the bending resistance and rigidity of the pile, delays the appearance of cracks, and increases the durability of the concrete pipe pile.

[0003] Currently, in the production of pipe piles, tensioning is primarily performed manually using a tensioning machine. The detailed steps are as follows: 1. Equipment transports the pipe pile mold to the tensioning position, and the nut auxiliary gear and tensioning head nut are manually inserted into the pile head plate. 2. The tensioning machine's through-cylinder is manually operated to raise and lower, move forward and backward, and left and right, aligning the tensioning screw of the pipe pile mold so that the tensioning screw and the tensioning cylinder's centerline are aligned, and the end face of the reaction frame contacts and is flush with the end face of the pipe mold head plate. 3. The through-cylinder nut at the front of the through-cylinder is manually aligned with the nut on the tensioning screw. 4. The through-cylinder on the tensioning machine is manually rotated and the tensioning nut's nut is locked. 5. The cylinder behind the through-cylinder is manually tightened, and the nut is tightened to transmit the tensioning force generated by the tensioning cylinder to the through-cylinder. 6. The AC motor above the end of the reaction frame is manually pressed downward, causing the gear at its front to engage with the auxiliary gear of the pipe mold nut. 7. Manually activate the tensioning machine, and the hydraulic cylinder enters the tensioning state, driving the tensioning screw and the steel cage inside the mold to stretch horizontally, creating prestress in the cage. The motor, through the transmission gear, engages the tightening nut auxiliary gear, driving the mold nut to tighten, simultaneously tightening the tensioning nut. 8. When the oil pressure reaches the set value, pressure is maintained and tensioning is performed in stages until the pre-set prestressing value is reached. The motor, through the transmission gear, engages the tightening nut auxiliary gear, tightening the nut in place and preventing the tensioning screw and the steel cage inside the mold from retracting. 9. Manually confirm the status and activate the release button, causing the oil pressure to drop rapidly. The hydraulic cylinder retracts. Manually disengage the AC motor driving the meshing gear, unlocking the tensioning nut. 10. Manually return the equipment to its initial position, remove the nut and nut auxiliary gear from the mold, and record the tensioning parameters for the corresponding mold number.

[0004] During the entire tensioning process, most of the auxiliary work of the existing tensioning equipment needs to be completed manually, with a low degree of automation, low equipment working accuracy, high risk, and a large and tedious workload. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides an automatic tensioning device for prestressed pipe piles, which has a high degree of automation integration and high docking accuracy when prestressing the pipe piles, can effectively reduce the probability of safety accidents and improve work efficiency.

[0006] The present invention provides an automatic prestressed pipe pile tensioning device, comprising a base, on which are mounted a hydraulic station, a control machine, a mobile lifting platform, a tensioning machine floating device, a tensioning docking locking device, an automatic cylinder nut tightening device, and an automatic pipe pile nut tightening device. The mobile lifting platform is mounted via a light rail on the base and can move forward and backward on the light rail; the tensioning machine floating device is fixedly mounted on the mobile lifting platform; the automatic cylinder nut tightening device, the tensioning docking locking device, and the automatic pipe pile nut tightening device are all mounted on the tensioning machine floating device and on the same center line, and can move forward and backward along the same center line. The hydraulic station and control machine control the mobile lifting platform to move forward and backward, and up and down, thereby moving the tensioning machine floating device to a predetermined position, eliminating manual operation and improving the automation level of the equipment.

[0007] Preferably, the automatic prestressed pipe pile tensioning equipment is equipped with a lifting height detection device installed on one side of the mobile lifting platform to transmit the height of the tensioning machine floating device on the mobile lifting platform in real time. The control platform can automatically control the docking height with the pipe pile, thereby improving the degree of automation of the equipment.

[0008] The mobile lifting platform includes a scissor-type support, a lift control cylinder, a drive wheel, and a tensioning drive motor. A drive shaft is mounted on one end of the mobile lifting platform. The tensioning drive motor is mounted on this drive shaft and drives the drive wheel to rotate via the drive shaft, controlling the mobile lifting platform along the track. The rear end of the lift control cylinder is hingedly mounted to the mobile lifting platform's baseplate. The scissor-type support is hingedly mounted to the baseplate and hingedly mounted to the head of the lift control cylinder. The lift control cylinder drives the scissor-type support to raise and lower the upper portion of the mobile lifting platform, causing it to hover. By controlling the lifting and hovering of the mobile lifting platform, the tensioning machine's floating device can be effectively controlled to automatically adjust its front and rear positions to achieve automatic alignment with the pipe pile mold.

[0009] The tensioning docking locking device includes a docking drive motor, a through-core screw, a tie rod cylinder, a through-core tensioning oil cylinder, a reaction frame, an end docking joint and an in-position detection switch. The through-core tensioning oil cylinder is fixed on the reaction frame; the through-core screw is installed concentrically with the through-core tensioning oil cylinder and is threadedly connected and fixed to one end of the end docking joint through the through-core tensioning oil cylinder; the internal thread of the other end of the end docking joint matches the external thread of the pipe pile tensioning screw, and the end docking joint is screwed into the pipe mold tensioning screw for docking; the in-position detection switch is fixed to the end docking joint to detect the depth of the pipe mold tensioning screw screwed into the end docking joint; the docking drive motor is connected to the end of the through-core screw and can drive the through-core screw to transmit; the tail of the tie rod cylinder is hinged to the reaction frame, and the head of the tie rod cylinder is hinged to the driving motor fixing frame. The tie rod cylinder drives the driving motor to move, thereby driving the through-core screw to move along the centerline direction in the through-core tensioning oil cylinder. Through the in-position detection switch and the through-screw transmission, the automatic docking of the end butt joint and the tensioning screw of the pipe pile mold is realized; through the action of the tensioning cylinder, a certain pressing force can be applied to the end butt joint to act on the tensioning screw of the pipe mold.

[0010] The automatic cylinder nut tightening device includes a drive motor, a coupling, a vertical fixed plate, a transmission gear, and a slewing bearing. The inner ring of the slewing bearing is fixedly connected to the vertical fixed plate, and the outer ring of the slewing bearing meshes with the transmission gear. The drive motor is fixedly connected to the vertical fixed plate, the drive motor output shaft is connected to the coupling, and the coupling is connected to the transmission gear. Through the concentric axial holes of the drive motor output shaft and the coupling, and the shaft and transmission gear, and key transmission, it drives a through-screw connected to the internal thread of the slewing bearing, thereby automatically tightening the piston end face of the through-screw tensioning cylinder and transmitting the tensioning force generated by the through-screw to the through-screw.

[0011] Preferably, the oil cylinder nut automatic tightening device includes an anti-deflection shaft. The anti-deflection shaft slides in the guide groove of the reaction frame to eliminate radial rotation of the oil cylinder nut automatic tightening device when it moves forward and backward.

[0012] The automatic tightening device for pipe pile nuts includes a second drive motor, a movable base plate, a guide rail, a stretching cylinder, a second vertical fixed plate, a limit block, a second slewing bearing, a second transmission gear, a second coupling, and a horizontal base plate; the second drive motor and the second vertical fixed plate are fixedly installed through a frame, a second coupling is installed in the frame, the output shaft of the drive motor is connected to the coupling, the coupling is connected to the second transmission gear, and the transmission gear is meshed with the outer ring of the second slewing bearing; the inner ring of the second slewing bearing is fixedly connected to the second vertical fixed plate, and the second vertical fixed plate is fixedly connected to the movable base plate; preferably, the inner ring of the second slewing bearing is a tensioning nut sleeve; one end of the stretching cylinder is connected to the horizontal base plate, and the other end is connected to the movable base plate, which drives the movable base plate to slide longitudinally along the guide rail. By engaging the tensioning nut sleeve with the pipe pile nut, the automatic tightening device for pipe pile nuts can automatically tighten the pipe pile nuts on the pipe pile mold during tensioning, so that the tensioning prestress is maintained by the pipe pile nut, thereby realizing the automatic tensioning process of the prestressed pipe pile.

[0013] The automatic prestressed pipe pile tensioning equipment described in the present invention automatically controls the lifting and forward and backward movement systems through the control of the machine and the mobile lifting platform, achieving precise alignment. The equipment's operating accuracy is enhanced by the functions of the tensioning machine's floating device, the tensioning docking and locking device, the automatic cylinder nut tightening device, and the automatic pile nut tightening device. The automatic prestressed pipe pile tensioning equipment described in the present invention can fully automatically align, dock, and tension pipe piles of various diameters, enabling automated production of prestressed pipe pile tensioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of an automatic tensioning machine for prestressed pipe piles;

[0015] Figure 2 is a schematic diagram of a mobile lifting platform;

[0016] Figure 3 This is a schematic diagram of the floating device of the tensioning machine;

[0017] Figure 4 A schematic diagram of a tensioning butt-jointing locking device;

[0018] Figure 5 This is a schematic diagram of the automatic tightening device for the oil cylinder nut;

[0019] Figure 6 This is a schematic diagram of the automatic tightening device for pile nuts;

[0020] Figure 7 Schematic diagram of the pipe pile mold;

[0021] The above drawings include the following reference numerals:

[0022] 1: Mobile lifting platform; 2: Tensioning machine floating device; 3: Tensioning docking locking device; 4: Cylinder nut automatic tightening device; 5: Pipe pile nut automatic tightening device; 6: Base; 7: Hydraulic station; 8: Control machine; 9: Lifting height detection device; 10: Docking detection device;

[0023] 1-1: Height sensor; 1-2: Scissor support; 1-3: Lifting control cylinder; 1-4: Driving wheel; 1-5: Tensioning drive motor; 1-6: Support surface;

[0024] 2-1: Floating guide rod; 2-2: Floating base plate; 2-3: Universal joint; 2-4: Tensioning mechanism; 2-5: Floating limiter; 2-6: Front end face;

[0025] 3-1: Docking drive motor; 3-2: Through-core screw; 3-3: Tie rod cylinder; 3-4: Through-core tensioning cylinder; 3-5: Reaction frame; 3-6: End butt joint; 3-7: In-position detection switch; 3-8: Reaction frame fixing plate;

[0026] 4-1: driving motor; 4-2: coupling; 4-3: vertical fixing plate; 4-4: transmission gear; 4-5: slewing bearing; 4-6: anti-deflection shaft;

[0027] 5-1: Second drive motor; 5-2: Moving base plate; 5-3: Second guide rail; 5-4: Stretching cylinder; 5-5: Second vertical fixed plate; 5-6: Limit block; 5-7: Second slewing bearing; 5-8: Tension nut sleeve; 5-9: Second transmission gear; 5-10: Second coupling; 5-11: Horizontal base plate;

[0028] 6-1: Pipe pile mold end panel; 6-2: Pipe pile nut; 6-3: Pipe mold tensioning screw. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0030] like Figure 1-7As shown, the present invention provides an automatic prestressed pipe pile tensioning device, comprising a hydraulic station 7, a control machine 8, a mobile lifting platform 1, a tensioning machine floating device 2, a tensioning joint locking device 3, an automatic cylinder nut tightening device 4, an automatic pipe pile nut tightening device 5, a lifting height detection device 9, and a joint detection device 10. The mobile lifting platform 1 is mounted on a light rail of the base 6 and can move back and forth on the rail; the tensioning machine floating device 2 is fixedly mounted on the mobile lifting platform 1, providing a joint floating function for the device; the automatic cylinder nut tightening device 4, the tensioning joint locking device 3, and the automatic pipe pile nut tightening device 5 are all mounted on the tensioning machine floating device 2 and installed on the same centerline. They can move back and forth along the same centerline and provide a joint locking function for the device during tensioning. A docking detection device 10 is fixedly mounted on one side of the reaction frame 3-5 of the tensioning docking locking device 3 to monitor the successful docking of the tensioning mechanism 2-4 with the pile mold. The lift height detection device 9 is fixedly mounted on one side of the mobile lifting platform 1 to monitor its height in real time and provide feedback to the control unit 8. The hydraulic station 7 provides the power source and hydraulic control for lifting and pulling. The control unit 8 is equipped with a human-machine interface and electrical control components to control all operations of the automatic prestressed pile tensioning equipment described herein.

[0031] like Figure 2 As shown, the mobile lifting platform 1 includes a height sensor 1-1, a scissor-type support 1-2, a lift control cylinder 1-3, a drive wheel 1-4, and a tension drive motor 1-5. The tension drive motor 1-5 is mounted on a drive shaft at the rear end of the base plate of the mobile lifting platform 1. The drive shaft drives the drive wheel 1-4 to rotate, controlling the mobile lifting platform 1 to move forward and backward along the track on the base 6. The rear end of the lift control cylinder 1-3 is hingedly mounted to the base plate of the mobile lifting platform 1 and is hingedly mounted to the scissor-type support 1-2. The lower right end of the scissor-type support 1-2 is hingedly mounted to the base plate of the mobile lifting platform 1, and the upper right end is hingedly mounted to the support surface 1-6. The lower left end of the scissor-type support 1-2 slides on the mobile lifting platform 1, and the upper left end slides on the support surface 1-6. The lifting control cylinder 1-3 drives the scissor-type support member 1-2 to rotate about the hinge, thereby causing the mobile lifting platform support surface 1-6 to perform lifting and hovering movements. The scissor-type support member 1-2 provides support and guidance during the lifting process. The height sensor 1-1 detects the height in real time during the lifting process and transmits the information to the control unit 8. The control unit 8 controls the operation of the tensioning drive motor 1-5 and the lifting control cylinder 1-3. The hydraulic station 7 provides the power source for the lifting control cylinder 1-3. The mobile lifting platform support surface 1-6 automatically adjusts its height based on the control of the control unit 8 and the height signal fed back by the lifting height detection device 9, thereby enabling the mobile lifting platform 1 to achieve controllable lifting, hovering, and forward and backward movement, achieving accurate docking between the device described in the present invention and the pipe pile mold.

[0032] like Figure 3 As shown, the tensioning machine floating device 2 is fixedly mounted on the support surface 1-6 of the mobile lifting platform and moves up and down, hovers, and moves forward and backward with the mobile lifting platform 1. The tensioning machine floating device 2 includes a floating guide rod 2-1, a floating base plate 2-2, a universal joint 2-3, a tensioning mechanism 2-4, and a floating limiter 2-5. The floating guide rod 2-1 is mounted in the guide limiter groove of the floating base plate 2-2 and slides along the guide limiter groove; the tensioning mechanism 2-4 is hinged to the floating guide rod 2-1 and to the floating base plate 2-2 via the universal joint 2-3, allowing the tensioning mechanism 2-4 to float relative to the floating base plate 2-2; the floating limiter 2-5 is fixedly mounted at both ends of the floating base plate 2-2, thereby limiting the movement distance of the tensioning mechanism 2-4 on the floating base plate 2-2. As the mobile lifting platform 1 rises and falls, hovers, and moves forward and backward, the tensioning machine floating device 2 moves to a suitable position, so that the tensioning mechanism 2-4 docks with the pipe mold tensioning screw 6-3 of the pipe pile mold. At this time, the mobile lifting platform 1 automatically adjusts its front and rear positions according to the control of the control machine 8 and the docking detection device 10 to complete automatic alignment with the pipe pile mold; at the same time, the tensioning machine floating device 2 floats at a certain angle, thereby eliminating the docking gap with the pipe pile mold end panel 6-1.

[0033] like Figure 4 As shown, the tensioning docking locking device 3 includes a docking drive motor 3-1, a through-core screw 3-2, a pull rod cylinder 3-3, a through-core tensioning oil cylinder 3-4, a reaction frame 3-5, an end docking joint 3-6 and an in-position detection switch 3-7. The through-core screw 3-2 and the through-core tensioning oil cylinder 3-4 are installed on the reaction frame 3-5. The through-core screw 3-2 passes through the through-core tensioning oil cylinder 3-4 and is fixed to one end of the end docking joint 3-6 by a threaded connection. The internal thread of the other end of the end docking joint 3-6 matches the external thread of the pipe pile mold tensioning screw 6-3 and is spirally docked; the in-position detection switch 3-7 is screwed to the end docking joint 3-6 to detect whether the depth of the pipe pile mold tensioning screw 6-3 after being screwed into the end docking joint 3-6 reaches the set value. The through-screw 3-2 is installed concentrically with the through-type tensioning oil cylinder 3-4 and can move along the centerline direction; the docking drive motor 3-1 is connected to the end shaft hole of the through-screw 3-2 and key-driven, driving the through-screw 3-2 to rotate clockwise and counterclockwise, thereby acting on the pipe pile mold tensioning screw 6-3 through the through-type tensioning oil cylinder 3-4 and the end docking joint 3-6, thereby loosening and locking the pipe pile mold tensioning screw 6-3. The tail of the cylinder body of the pull rod cylinder 3-3 is hinged to the reaction frame 3-5, and the head is hinged to the fixed frame of the drive motor 3-1. The through-screw 3-2 is fixedly installed on the fixed frame of the drive motor 3-1. When the pull rod cylinder 3-3 drives the fixed frame of the drive motor 3-1 to move, the through-screw 3-2 moves along the centerline direction in the through-type tensioning oil cylinder 3-4, and the tensioning screw 6-3 connected to the end docking joint 3-6 is subjected to a compressive force.

[0034] The tensioning docking locking device 3 is installed on the tensioning machine floating device 2, and one end of the reaction frame 3-5 is inserted into the middle of the tensioning mechanism 2-4 and fixedly connected. At this time, the reaction frame fixing plate 3-8 is in contact with the front end surface 2-6 of the tensioning mechanism.

[0035] like Figure 5 As shown, the automatic cylinder nut tightening device 4 is mounted on the through-screw 3-2 of the tensioning and docking locking device 3. The automatic cylinder nut tightening device 4 includes a drive motor 4-1, a coupling 4-2, a vertical fixed plate 4-3, a transmission gear 4-4, a slewing bearing 4-5, and an anti-deflection shaft 4-6. The drive motor 4-1 is fixedly connected to the vertical fixed plate 4-3, with the coupling 4-2 installed between them. The output shaft of the drive motor 4-1 is concentric with the coupling 4-2, connected by a shaft hole, and keyed. The coupling 4-2 is concentric with the transmission gear 4-4, connected by a shaft hole, and keyed. The inner ring of the slewing bearing 4-5 is fixedly connected to the vertical fixed plate 4-3, and the outer ring of the slewing bearing 4-5 meshes with the transmission gear 4-4. When the drive motor 4-1 rotates, it drives the transmission gear 4-4, which in turn drives the slewing bearing 4-5 through meshing transmission.

[0036] The through-screw 3-2 passes through the slewing support 4-5 and the vertical fixed plate 4-3. The drive motor 3-1 is mounted at the end of the through-screw 3-2 and positioned below the drive motor. The internal thread of the slewing support 4-5 drives the external thread of the through-screw 3-2 and is mounted concentrically. As the slewing support 4-5 rotates, the automatic cylinder nut tightening device 4 moves back and forth along the centerline of the through-screw 3-2, tightening the cylinder nut. At this time, the tensioning force generated by the through-screw tensioning cylinder 3-4 is transmitted to the through-screw 3-2. The anti-deflection shaft 4-6 is fixedly connected to the vertical fixed plate 4-3 and slides in the guide groove of the reaction frame 3-5, thereby eliminating radial rotation caused by the automatic cylinder nut tightening device 4 as it moves back and forth.

[0037] like Figure 6As shown, the automatic pipe pile nut tightening device 5 is fixed to the upper end of the reaction frame 3-5 of the tensioning and docking locking device 3 via a horizontal base plate 5-11. The automatic pipe pile nut tightening device 5 includes a second drive motor 5-1, a movable base plate 5-2, a guide rail 5-3, a tensioning cylinder 5-4, a second vertical fixed plate 5-5, a limit block 5-6, a second slewing bearing 5-7, a tensioning nut sleeve 5-8, a second transmission gear 5-9, a second coupling 5-10, and a horizontal base plate 5-11. The inner ring of the second slewing bearing 5-7 is fixedly connected to the second vertical fixed plate 5-5, and the outer ring of the second slewing bearing 5-7 meshes with the second transmission gear 5-9. The second drive motor 5-1 is fixedly mounted to the second vertical fixed plate 5-5 via a frame, in which a second coupling 5-10 is installed. The output shaft of the drive motor 5-1 is concentric with the second coupling 5-10, connected via a shaft hole, and keyed. The second coupling 5-10 is concentric with the second transmission gear 5-9, connected via a shaft hole, and keyed. The second vertical fixed plate 5-5 is fixedly connected to the movable base plate 5-2. Simultaneously, the movable base plate 5-2 slides longitudinally along the guide rail 5-3. The guide rail 5-3 is fixedly connected to the horizontal base plate 5-11. One end of the stretching cylinder 5-4 is connected to the movable base plate 5-2, and the other end is connected to the horizontal base plate 5-11. A limit block 5-6 is fixedly connected to the horizontal base plate 5-11, limiting the range of motion of the movable base plate 5-2. The inner ring of the second slewing bearing 5-7 is a tensioning nut sleeve (5-8). When the second drive motor 5-1 rotates, it drives the second transmission gear 5-9 to rotate. The second transmission gear 5-9 drives the tensioning nut sleeve 5-8 of the second slewing bearing 5-7 to rotate through meshing transmission.

[0038] When not tensioning, the second drive motor 5-1, the second coupling 5-10, the second vertical fixed plate 5-5, the second transmission gear 5-9, the slewing support 5-7 and the movable base plate 5-2 are placed as a whole at the front end of the horizontal base plate 5-11. At this time, the tensioning nut sleeve 5-8 protrudes from the surface of the horizontal base plate 5-11; when preparing for tensioning, the stretching cylinder 5-4 starts to stretch, and the tensioning nut sleeve 5-8 first contacts the end panel 6-1 of the pipe pile mold, and then the movable base plate 5-2 moves backward relative to the guide rail 5-3, driving the second vertical fixed plate 5-5 and the second slewing support 5-7 to move backward. At this time, the tensioning nut sleeve 5-8 has a certain pressure on the end panel 6-1 of the pipe pile mold to ensure that when the tensioning nut sleeve 5-8 rotates the pipe pile nut 6-2, the tensioning nut sleeve 5-8 can achieve synchronous forward displacement with the pipe pile mold 6.

[0039] The specific working process of the automatic prestressed pipe pile tensioning device of the present invention is as follows:

[0040] First, the control machine 8 controls the tensioning drive motor 1-5 to drive the drive wheel 1-4, so that the mobile lifting platform 1 moves to the desired position on the track of the base 6; the control machine 8 controls the lifting control cylinder 1-3 and the hydraulic station 7 to provide a power source for the lifting control cylinder 1-3, so that the scissor support 1-2 rotates at the hinge with the bottom plate of the mobile lifting platform 1, thereby making the mobile lifting platform support surface 1-6 perform lifting and hovering actions, and the lifting height detection device 9 installed on the mobile lifting platform 1 sends a height signal feedback to the control machine 8 in real time until the tensioning machine floating device 2 fixed on the mobile lifting platform 1 is accurately docked with the pipe pile mold.

[0041] When the floating device 2 of the tensioning machine is docked with the pipe pile mold, the control machine 8 controls the floating guide rod 2-1 to move to a suitable position in the guide limit groove of the floating base bottom plate 2-2 according to the position of the tensioning mechanism 2-4 and the pipe pile mold, so that the tensioning mechanism 2-4 is docked with the pipe mold tensioning screw 6-3 of the pipe pile mold; and the tensioning mechanism 2-4 is hinged and rotated with the floating guide rod 2-1 and rotated at the hinge of the universal joint 2-3, and the tensioning mechanism 2-4 floats at a certain angle, thereby eliminating the docking gap caused by a small deviation with the end panel 6-1 of the pipe pile mold.

[0042] When the tensioning machine floating device 2 is docked with the pipe pile mold, the stretching cylinder 5-4 of the pipe pile nut automatic tightening device 5 is controlled by the control machine 8 to drive the movable base plate 5-2 to move on the horizontal base plate 5-11, so that the second vertical fixed plate 5-5 and the second slewing support 5-7 move and drive the tensioning nut sleeve 5-8 to protrude from the outside of the horizontal base plate 5-11, so that the tensioning nut sleeve 5-8 contacts the pipe pile mold end panel 6-1, and the pipe pile nut 6-2 is locked with the tensioning nut sleeve 5-8; after that, the stretching cylinder 5-4 starts to stretch, and the movable base plate 5-2 moves backward relative to the guide rail 5-3, while driving the second vertical fixed plate 5-5 and the second slewing support 5-7 to move backward, and the tensioning nut sleeve 5-8 drives the pipe pile mold 6 to retract and move to the predetermined position. The automatic tightening device 5 for the pipe pile nut automatically tightens the pipe pile nut 6-2 on the pipe pile mold during tensioning, so that the tensioning prestress is maintained through the pipe pile nut 6-2, thereby realizing the automatic tensioning process of the prestressed pipe pile.

[0043] At this point, the external thread of the pile mold tensioning screw 6-3 matches and screws with the internal thread of the end butt joint 3-6. The in-position detection switch 3-7 detects whether the depth of the pile mold tensioning screw 6-3 after being screwed into the end butt joint 3-6 has reached the set value. The control machine 8 controls the driving motor 4-1 to rotate, which drives the transmission gear 4-4 to rotate. The transmission gear 4-4 drives the slewing bearing 4-5 to rotate through meshing transmission, so that the internal thread of the slewing bearing 4-5 matches and is concentrically installed with the external thread of the through screw (3-2). The docking drive motor 3-1 drives the through-core screw (3-2) to rotate clockwise and counterclockwise, thereby acting on the pipe pile mold tensioning screw 6-3 through the through-core tensioning cylinder 3-4 and the end docking joint 3-6, thereby loosening and locking the pipe pile mold tensioning screw 6-3; when the stretching cylinder 3-3 drives the driving motor 3-1 fixed frame to move, the through-core screw 3-2 moves along the center line direction in the through-core tensioning cylinder 3-4, and the pipe pile mold tensioning screw 6-3 connected to the end docking joint 3-6 is subjected to a clamping force, and the pipe pile mold tensioning screw 6-3 performs prestressing tensioning on the cage reinforcement in the pipe pile mold.

Claims

1. An automatic tensioning device for prestressed pipe piles, comprising a base, on which a hydraulic station and a control machine are mounted, characterized in that: The base is also equipped with a mobile lifting platform, a tensioning machine floating device, a tensioning docking locking device, an automatic tightening device for oil cylinder nuts, and an automatic tightening device for pipe pile nuts; the mobile lifting platform is installed through the light rail of the base and can move forward and backward on the light rail of the base; the tensioning machine floating device is fixedly installed on the mobile lifting platform; the automatic tightening device for oil cylinder nuts, the tensioning docking locking device, and the automatic tightening device for pipe pile nuts are all installed on the tensioning machine floating device and installed on the same center line, and can move forward and backward along the same center line; A lifting height detection device is installed on one side of the mobile lifting platform; The mobile lifting platform includes a scissor-type support, a lifting control oil cylinder, a driving wheel and a tensioning drive motor; one end of the mobile lifting platform is a driving shaft, and the tensioning drive motor is installed on the driving shaft and drives the driving wheel to rotate through the driving shaft to control the mobile lifting platform to move forward and backward along the track; the tail of the lifting control oil cylinder is hingedly installed with the bottom plate of the mobile lifting platform; the scissor-type support is hingedly installed with the bottom plate of the mobile lifting platform and is hingedly installed with the head of the lifting control oil cylinder, and the lifting control oil cylinder drives the scissor-type support to make the upper part of the mobile lifting platform perform lifting and hovering actions; The tensioning machine floating device includes a floating guide rod, a floating base bottom plate, a universal joint, a tensioning mechanism and a floating limit piece; the floating guide rod is installed in the guide limit groove of the floating base bottom plate and slides along the guide limit groove; the tensioning mechanism is hinged to the floating guide rod and hinged to the floating base bottom plate through a universal joint; the floating limit piece is fixedly installed at both ends of the floating base bottom plate; The automatic tightening device for the oil cylinder nut includes a drive motor, a coupling, a vertical fixed plate, a transmission gear, and a slewing bearing; the inner ring of the slewing bearing is fixedly connected to the vertical fixed plate, and the outer ring of the slewing bearing is engaged with the transmission gear; the drive motor is fixedly connected to the vertical fixed plate, and the output shaft of the drive motor is connected to the coupling; the coupling is connected to the transmission gear.

2. The automatic prestressed pipe pile tensioning device according to claim 1, characterized in that: A height sensor is installed on the upper part of the mobile lifting platform.

3. The automatic prestressed pipe pile tensioning device according to claim 2, characterized in that: The tensioning docking locking device includes a docking drive motor, a through-core screw, a pull rod cylinder, a through-type tensioning oil cylinder, a reaction frame, an end docking joint and an in-position detection switch; the through-type tensioning oil cylinder is fixed on the reaction frame; the through-core screw is installed concentrically with the through-core tensioning oil cylinder, and passes through the through-core tensioning oil cylinder and is threadedly connected and fixed to one end of the end docking joint; the internal thread of the other end of the end docking joint matches the external thread of the pipe pile tensioning screw, and the end docking joint is screwed into the pipe mold tensioning screw for docking; the in-position detection switch is fixed on the end docking head to detect the depth of the pipe mold tensioning screw screwed into the end docking joint; the docking drive motor is connected to the end of the through-core screw; the tail of the pull rod cylinder is hinged to the reaction frame, and the head of the pull rod cylinder is hinged to the driving motor fixing frame, and the pull rod cylinder drives the driving motor to move, thereby driving the through-core screw to move along the center line direction in the through-type tensioning oil cylinder.

4. The automatic prestressed pipe pile tensioning device according to claim 1, characterized in that: The oil cylinder nut automatic tightening device includes an anti-deflection shaft.

5. The automatic prestressed pipe pile tensioning device according to claim 4, characterized in that: The automatic tightening device for pipe pile nuts includes a second drive motor, a movable base plate, a guide rail, a stretching cylinder, a second vertical fixed plate, a limit block, a second slewing bearing, a second transmission gear, a second coupling, and a horizontal base plate; the second drive motor and the second vertical fixed plate are fixedly installed through a frame, a second coupling is installed in the frame, the output shaft of the second drive motor is connected to the second coupling, the second coupling is connected to the second transmission gear, and the second transmission gear is meshed with the outer ring of the second slewing bearing; the inner ring of the second slewing bearing is fixedly connected to the second vertical fixed plate, and the second vertical fixed plate is fixedly connected to the movable base plate; the inner ring of the second slewing bearing is a tensioning nut sleeve; one end of the stretching cylinder is connected to the horizontal base plate, and the other end is connected to the movable base plate, which drives the movable base plate to slide longitudinally along the guide rail.

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