Pre-fabricated pipe pile head buffering and reinforcing device

Abstract

This invention discloses a precast pipe pile head buffering and reinforcement device, comprising: a base, installed on the end face of the precast pipe pile head via a locking structure, the base shielding the end face, and coaxially arranged with the precast pipe pile; a bearing plate, coaxially arranged on the side of the base away from the precast pipe pile head; a support structure, including an elastic sleeve and multiple elastic columns, the two ends of the elastic sleeve being connected to the bearing plate and the base respectively, the elastic sleeve being coaxially arranged with the bearing plate, and the elastic columns being disposed within the elastic sleeve and connected to the bearing plate and the base; and a damping mechanism, including a hydraulic cylinder, one end of which is connected to the bearing plate, a piston slidingly disposed within the hydraulic cylinder to form a rod chamber and a rodless chamber, the side of the piston away from the bearing plate being connected to the base via a piston rod, the rod chamber being connected to the rodless chamber via a pipeline, and multiple throttling valves being connected in parallel on the pipeline. This invention solves the problem that traditional pile head protection devices are difficult to implement multi-stage variable speed buffering and have low buffering efficiency.

Description

Technical Field

[0001] This invention relates to the field of precast pipe pile technology, and specifically to a precast pipe pile head buffer reinforcement device. Background Technology

[0002] As a commonly used foundation type in foundation engineering, precast pipe piles are highly susceptible to impact loads at their pile heads during construction, such as hammer driving, static pressure pile construction, or horizontal load transfer at the pile top.

[0003] In the existing field of precast pipe pile head buffering and reinforcement technology, traditional pile head protection devices mainly include the following types: pure mechanical buffer pad devices, single spring shock absorption mechanisms, simple hydraulic buffer devices, and combined rigid sheaths.

[0004] Among them, pure mechanical buffer pads are usually made of rubber pads, wooden pads or polymer elastic layers. They are simple in structure and low in cost, but their buffering capacity is limited. Under large impact energy, the pads are prone to crushing, permanent deformation or aging failure. Moreover, they cannot adaptively adjust the buffer stiffness according to the impact intensity, resulting in unstable protection effect under varying working conditions.

[0005] While a single spring damping mechanism provides a certain degree of elastic support, it is prone to resonance when subjected to high-frequency repeated impacts. Furthermore, the spring has a limited fatigue life and lacks a damping energy dissipation mechanism, which means that the impact energy cannot be effectively dissipated. Instead, it may amplify the vibration displacement of the pile head and affect the integrity of the pile body.

[0006] Simple hydraulic buffer devices generally use a single-stage throttle valve or a damping structure with a fixed orifice. Their buffering curve is relatively linear. When faced with impact loads of different amplitudes and frequencies, it is difficult to achieve multi-stage variable speed buffering. Excessive initial impact force can easily cause instantaneous overload, and insufficient buffering in the later stage may cause secondary impacts, resulting in low buffering efficiency.

[0007] In addition, existing pile head fixing mechanisms mostly use rigid clamps or bolt plates, which require repeated manual adjustments, have a low degree of automation, and cannot maintain stable contact during the buffering process. They are prone to loosening or local stress concentration when the pile head shakes, which can lead to quality defects such as cracking of the pile head concrete and exposure of reinforcing bars. Summary of the Invention

[0008] To overcome the shortcomings of existing technologies, a precast pipe pile head buffer reinforcement device is provided to solve the problem that traditional pile head protection devices are difficult to achieve multi-stage variable speed buffering and have low buffering efficiency.

[0009] To achieve the above objectives, a precast pipe pile head buffer reinforcement device is provided, comprising: The base is installed on the end face of the precast pipe pile head through a locking structure. The base covers the end face and is coaxially arranged with the precast pipe pile. The bearing plate is coaxially mounted on the side of the base away from the head of the precast pipe pile; The supporting structure includes an elastic sleeve and multiple elastic columns. The two ends of the elastic sleeve are connected to the pressure plate and the base, respectively. The elastic sleeve is coaxial with the pressure plate. The elastic columns are installed inside the elastic sleeve and connected to the pressure plate and the base. The damping mechanism includes a hydraulic cylinder for containing hydraulic oil. One end of the hydraulic cylinder is connected to a pressure plate. A piston slides inside the hydraulic cylinder to form a rod chamber and a rodless chamber. The side of the piston away from the pressure plate is connected to a base through a piston rod. The rod chamber is connected to the rodless chamber through a pipeline. Multiple throttle valves are connected in parallel on the pipeline. The flow areas of the multiple throttle valves decrease sequentially. After the pressure plate is compressed, the multiple throttle valves open sequentially in order of decreasing flow area.

[0010] Furthermore, the locking structure includes: Multiple arms, one end of which is connected to the base, and multiple arms are spaced apart along the circumferential direction of the bearing plate. The other end of the arms extends to the side of the precast pipe pile. The support rod is installed in an adjustable position at the other end of the arm and presses against the side of the precast pipe pile.

[0011] Furthermore, a threaded hole is provided at the other end of the limb, and the support rod has an external thread, which is screwed into the threaded hole of the limb.

[0012] Furthermore, the threaded holes of the limbs are set along the radial direction of the precast pipe pile.

[0013] Furthermore, the elastic column includes: The sleeve has one end connected to the pressure plate; A guide rod, one end of which is connected to the base, and the other end of which is movably inserted into the other end of the sleeve; A spring is connected to one end of the sleeve and one end of the guide rod.

[0014] Furthermore, multiple elastic columns are spaced apart along the circumference of the bearing plate.

[0015] Furthermore, the damping structure is coaxially arranged with the pressure plate.

[0016] Furthermore, an accumulator is connected to the rod cavity.

[0017] Furthermore, it also includes a centering device for centering the precast pipe piles, which is installed on the base.

[0018] Furthermore, the centering device includes: Multiple control rods are provided. An assembly cavity is formed inside the base. Multiple first strip-shaped through holes are provided on the side of the base away from the pressure plate. The first strip-shaped through holes are arranged along the radial direction of the pressure plate and are connected to the assembly cavity. A control rod is slidably provided at one end of the first strip-shaped through hole near the center of the plane of the base. The drive mechanism installed in the assembly cavity includes a turntable and a motor. The turntable is rotatably installed in the assembly cavity and is coaxially arranged with the pressure plate. The turntable has a second strip-shaped through hole, which is angled to the first strip-shaped through hole. One end of the control rod slides in the second strip-shaped through hole, and the other end of the control rod is inserted into the port of the precast pipe pile. The motor drive is connected to the turntable. After the turntable rotates, multiple control rods slide from one end of the first strip-shaped through hole to the other end of the first strip-shaped through hole. The other ends of the multiple control rods simultaneously press against the inner wall of the precast pipe pile, so that the precast pipe pile and the base are coaxially arranged.

[0019] The beneficial effects of this invention are as follows: the precast pipe pile head buffer reinforcement device of this invention sets up multiple throttle valves with progressively smaller flow areas in parallel on the pipeline between the rod chamber and the rodless chamber of the hydraulic cylinder, and opens them sequentially in order of decreasing flow area after the pressure plate is pressurized, so that the buffering process is divided into multiple stages: in the initial stage, the large flow area rapidly releases pressure to avoid instantaneous pressure peaks; in the later stage, the small flow area gradually slows down the buffering speed, realizing the smooth attenuation of impact force, effectively preventing secondary impacts, and greatly improving buffering efficiency and adaptability to different impact loads.

[0020] The precast pipe pile head buffer reinforcement device of this invention achieves superior buffering performance through the synergistic effect of dual elastic support and hydraulic damping. The support structure adopts a combination of elastic sleeves and multiple elastic columns. The elastic sleeves provide initial elastic support during large deformations, while the elastic columns provide stable axial restoring force. Together, they absorb the initial impact energy, reducing the risk of instantaneous overload of the hydraulic system. Simultaneously, in conjunction with the hydraulic throttling effect of the damping mechanism, a composite buffering system of "elastic energy absorption + hydraulic energy dissipation" is formed, ensuring stable and reliable buffering. Attached Figure Description

[0021] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the precast pipe pile head buffer reinforcement device according to an embodiment of the present invention.

[0022] Figure 2 This is a sectional view of the precast pipe pile head buffer reinforcement device according to an embodiment of the present invention.

[0023] Figure 3 This is a cross-sectional view of the base according to an embodiment of the present invention.

[0024] Figure 4 This is a bottom view of the base according to an embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the turntable structure according to an embodiment of the present invention.

[0026] Figure label: Base 1, assembly cavity a, first strip-shaped through hole b; Pressure plate 2; Support structure 3, elastic sleeve 31, elastic column 32, spring 323; Damping mechanism 4, hydraulic cylinder 41, piston rod 42, throttle valve 43, accumulator 44; Locking structure 5, limb 51, support rod 52; Centering device 6, control rod 61, turntable 62, motor 63, second strip-shaped through hole c. Detailed Implementation

[0027] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] Reference Figures 1 to 5 As shown, the present invention provides a precast pipe pile head buffer reinforcement device, comprising: a base 1, a pressure plate 2, a support structure 3, a damping mechanism 4, a locking structure 5, and a centering device 6.

[0030] In this embodiment, the base is a rectangular steel block. The dimensions of the base's bottom surface are slightly larger than the cross-section of the precast pipe pile. The precast pipe pile is positioned at the center of the plane of the base's bottom surface.

[0031] The base 1 is installed on the end face of the precast pipe pile head via the locking structure 5. The base 1 covers the end face of the precast pipe pile. The base 1 and the precast pipe pile are coaxially arranged.

[0032] The bearing plate is circular. The bearing plate is a circular steel plate. The bearing plate 2 is coaxially arranged on the side of the base 1 away from the head of the precast pipe pile.

[0033] The support structure 3 includes an elastic sleeve 31 and multiple elastic columns 32. The two ends of the elastic sleeve 31 are connected to the pressure plate 2 and the base 1, respectively. The elastic sleeve 31 is coaxially arranged with the pressure plate 2. The elastic columns 32 are disposed within the elastic sleeve 31. The elastic columns 32 are connected to the pressure plate 2 and the base 1. The elastic columns are arranged along the axial direction of the pressure plate.

[0034] The damping mechanism 4 includes a hydraulic cylinder 41, a piston, a piston rod 42, and a throttle valve 43. The hydraulic cylinder 41 is used to contain hydraulic oil. The hydraulic cylinder is arranged along the axial direction of the pressure plate.

[0035] One end of the hydraulic cylinder 41 is connected to the pressure plate 2. A piston slides inside the hydraulic cylinder 41 to form a rod chamber and a rodless chamber. The piston can slide along the axial direction of the hydraulic cylinder. The piston divides the inner cavity of the hydraulic cylinder into a rod chamber and a rodless chamber. The piston rod is located in the rod chamber. The hydraulic cylinder has two opposing ends. A through hole is opened on the end face of one end of the hydraulic cylinder. The piston rod moves through the through hole. The side of the piston away from the pressure plate 2 is connected to the base 1 via the piston rod 42. The rod chamber is connected to the rodless chamber through a pipeline. Multiple throttle valves 43 are connected in parallel on the pipeline. The flow area of ​​the multiple throttle valves 43 decreases sequentially.

[0036] After the pressure plate 2 is compressed, multiple throttle valves 43 open sequentially in order of decreasing flow area.

[0037] The locking structure 5 includes a limb 51 and a support rod 52.

[0038] There are multiple limbs 51. One end of each limb 51 is connected to the base 1. Multiple limbs 51 are spaced apart along the circumferential direction of the bearing plate 2, and the other end of each limb 51 extends to the side of the precast pipe pile.

[0039] The support rod 52 is adjustablely installed at the other end of the arm 51. The support rod 52 presses against the side of the precast pipe pile.

[0040] In this embodiment, there are four limbs. The four limbs are evenly spaced along the circumferential direction of the base. The limbs are inverted L-shaped.

[0041] The other end of the arm 51 has a threaded hole. The threaded hole is provided along the radial direction of the precast pipe pile. The support rod 52 has external threads. The support rod 52 is screwed into the threaded hole of the arm 51.

[0042] In this embodiment, the threaded hole of the arm 51 is provided along the radial direction of the precast pipe pile.

[0043] The elastic column 32 includes: a sleeve, a guide rod, and a spring 323.

[0044] One end of the sleeve is connected to the pressure plate 2. One end of the guide rod is connected to the base 1. The other end of the guide rod is movably inserted into the other end of the sleeve. The other end of the guide rod can slide along the axial direction of the sleeve. A spring 323 is connected to one end of the sleeve and one end of the guide rod.

[0045] In this embodiment, the spring is a helical spring. The helical spring is sleeved on the outside of the sleeve and the guide rod.

[0046] In a preferred embodiment, multiple elastic columns 32 are spaced apart along the circumferential direction of the pressure plate 2.

[0047] See Figure 2 As shown, the damping structure is coaxially arranged with the pressure plate 2. An accumulator 44 is connected to the rod cavity. In this embodiment, the accumulator is a pneumatic accumulator.

[0048] Combination Figure 2 and Figure 3 As shown, the precast pipe pile head buffer reinforcement device of the present invention also includes a centering device 6. The centering device 6 is installed on the base 1. The centering device 6 is used to center the precast pipe pile.

[0049] Specifically, in combination Figure 4 and Figure 5 As shown, the centering device 6 includes a control lever 61 and a drive mechanism.

[0050] There are multiple control levers 61. In this embodiment, there are four control levers. Correspondingly, an assembly cavity a is formed inside the base 1. See reference. Figure 4 As shown, a plurality of first strip-shaped through holes b are provided on the side of the base 1 away from the pressure plate 2. The first strip-shaped through holes b are arranged along the radial direction of the pressure plate 2. The first strip-shaped through holes b are connected to the assembly cavity a. A control rod 61 is slidably provided at one end of the first strip-shaped through hole b near the center of the plane of the base 1.

[0051] The drive mechanism is installed within the assembly cavity a. The drive mechanism includes a turntable 62 and a motor 63. The turntable 62 is rotatably installed within the assembly cavity a. The turntable 62 is coaxially arranged with the pressure plate 2. (See reference...) Figure 5 As shown, the turntable 62 has a second strip-shaped through hole c. The second strip-shaped through hole c is set at an angle to the first strip-shaped through hole b. One end of the control rod 61 slides into the second strip-shaped through hole c. The other end of the control rod 61 is inserted into the port of the precast pipe pile. The motor 63 is connected to the turntable 62 for driving.

[0052] After the turntable 62 rotates, multiple control rods 61 slide from one end of the first strip-shaped through hole b to the other end of the first strip-shaped through hole b. At the same time, the other ends of the multiple control rods 61 press against the inner wall of the precast pipe pile, so that the precast pipe pile and the base 1 are coaxially set.

[0053] In this embodiment, the bearing plate and the top surface of the base are arranged parallel to each other and elastically connected by a supporting structure to form a compressible axial buffer space. The bottom surface of the base is in contact with the end face of the precast pipe pile head. The bottom surface of the base directly presses against the end face of the upper end of the precast pipe pile head.

[0054] The support structure includes an elastic sleeve and multiple elastic columns. The elastic sleeve is a ring-shaped compressible elastomer made of highly elastic rubber material. The multiple elastic columns are arranged concentrically with the elastic sleeve, that is, the central axis of the elastic sleeve coincides with the central axis of the distribution circle of the elastic columns.

[0055] The number of elastic columns is preferably 4 to 8, evenly distributed in a ring array along the circumference between the pressure plate and the base. One end flange of the sleeve of each elastic column is bolted to the lower surface of the pressure plate. One end of the guide rod is welded to the upper surface of the base. A helical spring is fitted between the sleeve and the guide rod. The top end of the helical spring abuts against one end of the sleeve, and the bottom end of the helical spring abuts against one end of the guide rod.

[0056] When the pressure plate is subjected to downward pressure, the elastic column compresses and deforms, and the helical spring generates an elastic restoring force, providing axial elastic support. The elastic sleeve and the elastic column form a dual elastic buffer system, jointly bearing the axial impact load.

[0057] The damping mechanism is fixedly installed at the center of the pressure plate.

[0058] The hydraulic cylinder is a single-acting hydraulic cylinder. Its cylinder body is vertically fixed to the center of the bottom plane of the pressure plate by bolts. The piston rod extends downward from the bottom of the hydraulic cylinder, and the end of the piston rod is fixedly connected to the center of the top surface of the base by a flange.

[0059] When the pressure plate and the base are relatively displaced, the piston rod reciprocates relative to the hydraulic cylinder body, driving the hydraulic oil to flow in the hydraulic system.

[0060] The multi-stage throttle valve includes a first throttle valve, a second throttle valve, and a third throttle valve, with the flow area decreasing sequentially among them. The flow area ratio of the first throttle valve, the second throttle valve, and the third throttle valve is 10:4:1.

[0061] The first, second, and third throttle valves are connected in parallel in the pipeline. This pipeline connects the rodless and rod-side chambers of the hydraulic cylinder.

[0062] The multi-stage throttle valve is a pressure-adaptive throttle valve that automatically selects different flow areas to operate during the buffering process based on changes in hydraulic oil pressure.

[0063] When the pile head is subjected to a large impact load, the pressure inside the hydraulic cylinder rises rapidly. The first throttle valve opens first. Due to its largest flow area, the hydraulic oil passes through quickly, achieving a rapid initial pressure reduction and avoiding excessively high instantaneous pressure peaks. As the impact energy is gradually released, the pressure inside the hydraulic cylinder gradually decreases. The second and third throttle valves then engage in operation in sequence, gradually reducing the flow area and slowing down the buffering speed. This achieves smooth attenuation of the impact force and avoids secondary impacts.

[0064] The accumulator is a pneumatic accumulator, connected to the rodless chamber of the hydraulic cylinder via piping. The accumulator absorbs excess hydraulic oil during impact, stores energy, and releases it after impact to assist in system reset. The accumulator effectively shortens reset time and improves the device's efficiency. Furthermore, a safety valve is installed between the rodless chamber of the hydraulic cylinder and the oil tank. The safety valve's opening pressure is set to a factor of [number missing] times the rated pressure to prevent overpressure and ensure safe operation of the equipment.

[0065] The locking structure is located at the bottom of the base. The arm is an L-shaped bent rod, with its top end welded to the support base and its bottom end extending vertically downwards and connected to a threaded seat. The support rod is a trapezoidal threaded rod that passes through the threaded seat and is threadedly engaged with it. The inner end of the support rod is equipped with a contact head for contacting the pile head. The contact head is a hemispherical rubber pad, which increases the friction with the pile head surface and avoids damage to the pile head surface.

[0066] By rotating the support rod, the radial clamping force of the contact head on the outer wall of the pile head can be precisely adjusted, thereby achieving radial fixation of the pile head. When the outer diameter of the pile head is different, the screw-in length of the support rod can be adjusted to accommodate precast pipe piles of different specifications, improving the versatility of the device. The centering device is located at the center of the bottom surface of the base and is used to automatically center and clamp the upper end of the pile head.

[0067] The base has a first strip-shaped through hole on its bottom surface. The four first strip-shaped through holes are distributed in a cross shape, that is, the four first strip-shaped through holes are evenly distributed along the circumference, and the extension direction of each first strip-shaped through hole is the radial direction of the base.

[0068] The turntable is a circular disc. It is mounted rotatably in the center of the base's inner cavity. Four second-shaped through holes are formed on the surface of the turntable. These second-shaped through holes are arc-shaped grooves. The four arc-shaped grooves are evenly distributed along the circumference, and each groove's direction is offset from the outside towards the center; that is, one end of the arc-shaped groove is close to the outer edge of the turntable, and the other end is close to the center of the turntable.

[0069] Four control rods are provided, each slidingly engaged within a corresponding guide groove. The control rods can slide radially along the guide grooves. The top of each control rod penetrates the base plate and extends into the base's inner cavity, where a protruding pin is located. This protruding pin engages within a corresponding arc-shaped groove on the turntable. When the turntable rotates, the groove wall pushes the protruding pin, thereby causing the control rod to move radially along the guide groove. A proximity sensor is installed on the outer surface of each control rod. This sensor detects the distance between the control rod and the inner wall of the pile head in real time, ensuring precise control of the clamping process.

[0070] The motor is mounted in the mounting cavity of the base via a vibration damping bracket. The vibration damping bracket absorbs the vibrations generated during motor operation, preventing interference with the buffering process. The motor is a servo motor. The output shaft of the servo motor is connected to the center of the turntable via a coupling, driving the turntable to rotate.

[0071] Specifically, the working process of the precast pipe pile head buffer reinforcement device of the present invention is as follows: Place the base on top of the precast pipe pile head, aligning the center of the base with the center of the pile head. Then, insert four control rods into the inner hole of the pile head. Start the servo motor, which drives the turntable to rotate. As the turntable rotates, the walls of the arc-shaped groove push the control rods. Due to the characteristic of the arc-shaped groove shifting from the outside towards the center, the control rods move radially away from the center of the base under the guidance of the guide groove; that is, all four control rods expand outwards simultaneously. When the proximity sensor on the outside of the control rod detects that the control rod is in contact with the inner wall of the upper end of the pile head, the servo motor stops rotating. At this point, the four control rods are evenly pressed against the inner wall of the pile head, achieving automatic centering and clamping of the pile head.

[0072] Manually rotate the four sets of support rods, screwing them inward until the hemispherical rubber pads of the contact heads are firmly pressed against the outer wall of the pile head. By observing the screw-in markings on the support rods or using a torque wrench to control the tightening torque, ensure that the four sets of radial support components exert uniform pressure on the pile head, preventing eccentric stress on the pile head. At this point, the pile head is firmly fixed by the bidirectional clamping of the centering device and the radial support components.

[0073] When the pile head is subjected to a downward impact load (such as during hammer driving or static pressure pile construction), the impact force is transmitted upward through the base to the support structure and damping mechanism.

[0074] First, the elastic sleeve is compressed. Because it is made of highly elastic rubber, it can quickly absorb the initial impact energy, preventing rigid impacts from causing instantaneous overload on the hydraulic system. At the same time, the elastic column is compressed synchronously, and the helical spring generates elastic restoring force, which, together with the elastic sleeve, provides initial elastic support and reduces the peak impact value.

[0075] As the impact load continues to act, the relative displacement between the pressure plate and the base increases, the piston rod moves downward relative to the hydraulic cylinder body, the volume of the rodless chamber of the hydraulic cylinder decreases, and the hydraulic oil pressure rises rapidly.

[0076] At this point, the multi-stage throttle valves automatically operate according to pressure changes: when the pressure is high, the first throttle valve opens first. Due to its largest flow area, hydraulic oil quickly flows through the throttle valve to the rod chamber, achieving rapid initial pressure relief and preventing the system pressure from exceeding the safety threshold. As the pressure gradually decreases, the second and third throttle valves engage sequentially, with the flow area decreasing step by step, gradually slowing down the buffering speed and resulting in an ideal attenuation characteristic in the impact force curve. Throughout the buffering process, the accumulator simultaneously absorbs some hydraulic oil, storing energy to provide auxiliary power for system reset.

[0077] Once the impact load disappears, the pressure inside the hydraulic cylinder decreases, the accumulator releases its stored energy, and the hydraulic oil flows back, allowing the auxiliary system to quickly reset. Simultaneously, the elastic restoring force of the support structure pushes the bearing plate upwards, restoring it to its initial equilibrium position. Throughout the entire buffering and reset process, the locking structure maintains a stable clamping hold on the pile head, preventing it from swaying or being subjected to eccentric forces, thus ensuring the integrity of the pile head remains undamaged.

[0078] The precast pipe pile head buffer reinforcement device of the present invention uses multiple throttle valves with progressively smaller flow areas connected in parallel on the pipeline between the rod chamber and the rodless chamber of the hydraulic cylinder. After the pressure plate is pressurized, these valves open sequentially in order of decreasing flow area, making the buffering process divided into multiple stages: initially, the large flow area rapidly releases pressure to avoid instantaneous pressure peaks; later, the small flow area gradually slows down the buffering speed, achieving smooth attenuation of impact force, effectively preventing secondary impacts, and significantly improving buffering efficiency and adaptability to different impact loads.

[0079] The precast pipe pile head buffer reinforcement device of this invention achieves superior buffering performance through the synergistic effect of dual elastic support and hydraulic damping. The support structure adopts a combination of elastic sleeves and multiple elastic columns. The elastic sleeves provide initial elastic support during large deformations, while the elastic columns provide stable axial restoring force. Together, they absorb the initial impact energy, reducing the risk of instantaneous overload of the hydraulic system. Simultaneously, in conjunction with the hydraulic throttling effect of the damping mechanism, a composite buffering system of "elastic energy absorption + hydraulic energy dissipation" is formed, ensuring stable and reliable buffering.

[0080] The accumulator-assisted rapid reset of the precast pipe pile head buffer reinforcement device of the present invention improves the efficiency of the working cycle. The accumulator is connected to a rod chamber, which absorbs excess hydraulic oil and stores energy during the impact. After the impact, the energy is released to assist the piston reset. Combined with the elastic restoring force of the support structure, the device can quickly return to the initial equilibrium position, shorten the reset time, and adapt to high-frequency impact conditions.

[0081] The locking structure of the precast pipe pile head buffer reinforcement device of the present invention is adjustable, highly versatile, and provides stable clamping. Multiple arms are spaced circumferentially, and the support rod is installed at the end of the arm through an adjustable thread position. This allows for flexible adjustment of the radial clamping force according to the different outer diameters of the precast pipe pile, adapting to various specifications of pipe piles. The end of the support rod is equipped with a hemispherical rubber contact head, which increases friction and avoids damage to the pile head surface, ensuring that the pile head is always stably clamped during the buffering process, preventing shaking and eccentric force.

[0082] The centering device of the precast pipe pile head buffer reinforcement device of the present invention achieves automatic centering, ensuring that the device and the pile head are installed coaxially. The base is equipped with a turntable and a motor-driven centering mechanism. When the turntable rotates, it pushes multiple control rods to slide synchronously radially along the first strip-shaped through hole through the second strip-shaped through hole, so that each control rod presses against the inner wall of the pile head at the same time, realizing automatic centering and clamping of the pile head, ensuring that the base and the precast pipe pile are strictly coaxial, avoiding local stress concentration and pile head damage caused by installation eccentricity, and improving the pile head reinforcement effect and construction quality.

[0083] The precast pipe pile head buffer reinforcement device of this invention has a compact overall structure, is easy to install, and is suitable for various construction conditions. The base, bearing plate, support structure, and damping mechanism are arranged coaxially, with high integration and small space occupation. The locking structure and centering device work together to quickly complete the fixing and centering of the device on the pile head. It is suitable for impact construction scenarios such as hammer driving and static pressure driving, as well as for conditions such as horizontal load transfer at the pile top, and has good engineering practical value.

[0084] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A precast pipe pile head buffer reinforcement device, characterized in that, include: The base is installed on the end face of the precast pipe pile head through a locking structure. The base covers the end face and is coaxially arranged with the precast pipe pile. The bearing plate is coaxially mounted on the side of the base away from the head of the precast pipe pile; The supporting structure includes an elastic sleeve and multiple elastic columns. The two ends of the elastic sleeve are connected to the pressure plate and the base, respectively. The elastic sleeve is coaxial with the pressure plate. The elastic columns are installed inside the elastic sleeve and connected to the pressure plate and the base. The damping mechanism includes a hydraulic cylinder for containing hydraulic oil. One end of the hydraulic cylinder is connected to a pressure plate. A piston slides inside the hydraulic cylinder to form a rod chamber and a rodless chamber. The side of the piston away from the pressure plate is connected to a base through a piston rod. The rod chamber is connected to the rodless chamber through a pipeline. Multiple throttle valves are connected in parallel on the pipeline. The flow areas of the multiple throttle valves decrease sequentially. After the pressure plate is compressed, the multiple throttle valves open sequentially in order of decreasing flow area.

2. The precast pipe pile head buffer reinforcement device according to claim 1, characterized in that, The locking structure includes: Multiple arms, one end of which is connected to the base, and multiple arms are spaced apart along the circumferential direction of the bearing plate. The other end of the arms extends to the side of the precast pipe pile. The support rod is installed in an adjustable position at the other end of the arm and presses against the side of the precast pipe pile.

3. The precast pipe pile head buffer reinforcement device according to claim 2, characterized in that, The other end of the limb has a threaded hole, and the support rod has an external thread. The support rod is screwed into the threaded hole of the limb.

4. The precast pipe pile head buffer reinforcement device according to claim 3, characterized in that, The threaded holes of the limbs are set along the radial direction of the precast pipe pile.

5. The precast pipe pile head buffer reinforcement device according to claim 1, characterized in that the elastic column include: The sleeve has one end connected to the pressure plate; A guide rod, one end of which is connected to the base, and the other end of which is movably inserted into the other end of the sleeve; A spring is connected to one end of the sleeve and one end of the guide rod.

6. The precast pipe pile head buffer reinforcement device according to claim 5, characterized in that, Multiple elastic columns are spaced apart along the circumference of the bearing plate.

7. The precast pipe pile head buffer reinforcement device according to claim 1, characterized in that, The damping structure is coaxially arranged with the pressure plate.

8. The precast pipe pile head buffer reinforcement device according to claim 1, characterized in that, The rod cavity is connected to an accumulator.

9. The precast pipe pile head buffer reinforcement device according to claim 1, characterized in that, It also includes a centering device for centering the precast pipe piles, which is installed on the base.

10. The precast pipe pile head buffer reinforcement device according to claim 9, characterized in that, The centering device includes: Multiple control rods are provided. An assembly cavity is formed inside the base. Multiple first strip-shaped through holes are provided on the side of the base away from the pressure plate. The first strip-shaped through holes are arranged along the radial direction of the pressure plate and are connected to the assembly cavity. A control rod is slidably provided at one end of the first strip-shaped through hole near the center of the plane of the base. The drive mechanism installed in the assembly cavity includes a turntable and a motor. The turntable is rotatably installed in the assembly cavity and is coaxially arranged with the pressure plate. The turntable has a second strip-shaped through hole, which is angled to the first strip-shaped through hole. One end of the control rod slides in the second strip-shaped through hole, and the other end of the control rod is inserted into the port of the precast pipe pile. The motor drive is connected to the turntable. After the turntable rotates, multiple control rods slide from one end of the first strip-shaped through hole to the other end of the first strip-shaped through hole. The other ends of the multiple control rods simultaneously press against the inner wall of the precast pipe pile, so that the precast pipe pile and the base are coaxially arranged.

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