A method and apparatus for adapting a variety of cross-sectioned key top-in devices

Abstract

The present application relates to the technical field of foundation and foundation engineering construction equipment, and discloses a device and method for adapting to various cross-section root keys jacking devices, which comprises a clamping box and a jacking leg; a clamping assembly is arranged inside the clamping box, and the clamping assembly is used for clamping and supporting different cross-section specifications of profile steel or non-profile steel root keys; a plurality of jacking legs are arranged circumferentially on the clamping box, one end of the jacking leg is movably connected with a supporting seat, the jacking legs can all stretch and contract along the jacking direction, and a guide anti-twist mechanism is arranged between the jacking legs, and the guide anti-twist mechanism is used for constraining the stretching and contraction of the jacking legs along the jacking direction. The clamping box type structure is used for clamping, supporting and guiding the root keys, so that the same set of jacking devices can adapt to different cross-section specifications of profile steel and non-profile steel root keys, and the jacking direction can be kept stable during the multi-point hydraulic jacking process, and the root keys are prevented from being horizontally, vertically and horizontally twisted during the jacking process.

Description

Technical Field

[0001] This invention relates to the field of foundation and foundation engineering construction equipment technology, specifically to a root key jacking device and method adapted to various cross-sections. Background Technology

[0002] In keyed foundation construction, steel keyed piles often utilize I-beams and other cross-sectional specifications (such as I28b and I40c) to enhance pile bearing capacity. However, existing keyed pile jacking devices are mostly single-section designs, and their clamping structures cannot quickly adapt to different web heights, flange widths, or non-steel cross-sections. This necessitates replacing the entire device or modifying it on-site when changing keyed pile specifications, resulting in poor versatility and high construction costs. Furthermore, the clamping force adjustment of traditional devices is cumbersome and difficult to adjust flexibly, impacting operational efficiency and reliability.

[0003] In addition, the construction space for small-diameter pile foundations is extremely limited. The jacking device needs to enter the narrow pile hole to work. However, the existing device lacks an effective guiding and anti-torsion mechanism. When the multiple jacking legs are hydraulically jacked, the force on each jacking leg is uneven, which can easily cause deflection or lateral displacement in or out of the plane. This can cause the root key to be unable to be jacked into the predetermined position perpendicular to the hole wall, or even jam or damage the reserved hole of the steel cage, which seriously affects the bearing capacity of the pile foundation and construction safety. Summary of the Invention

[0004] To address existing problems, this invention provides a jacking device and method for adapting to root keys with various cross-sections. The device uses a clamping box structure to clamp, support, and guide the root key, enabling the same jacking device to adapt to root keys of different cross-sections, including both shaped and non-shaped steel. It also maintains a stable jacking direction during multi-point hydraulic jacking, preventing lateral and vertical movement and horizontal torsion of the shaped steel root key during the jacking process.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] This invention provides a root key jacking device adaptable to various cross-sections, including a clamping box and jacking legs; the clamping box is equipped with a clamping assembly for clamping and supporting root keys of different cross-sections, whether shaped or non-shaped; the clamping box is circumferentially provided with several jacking legs, one end of which is movably connected to a support seat; all jacking legs can extend and retract along the jacking direction, and a guide anti-torsion mechanism is provided between the jacking legs to constrain the extension and retraction of the jacking legs along the jacking direction.

[0007] As a further improvement of the present invention, the clamping assembly includes at least two opposing clamping blocks, the two clamping blocks being arranged opposite each other to clamping surfaces suitable for steel profiles or non-steel root keys of different cross-sectional specifications, and the distance between the two blocks being adjustable.

[0008] As a further improvement of the present invention, each of the two opposing clamping blocks is provided with a wedge-shaped slider on its outer side, the wedge-shaped slider being threadedly connected to a lead screw passing through it, and both lead screws being gear-driven connected to a transmission rod; a locking structure is provided on the lead screw or the transmission rod.

[0009] As a further improvement of the present invention, the clamping surface is planar, semi-cylindrical, hemispherical, or semi-conical.

[0010] As a further improvement of the present invention, the clamping assembly includes a support assembly disposed on the bottom side of the clamping assembly, the support assembly being adjustable in vertical position.

[0011] As a further improvement of the present invention, the jacking outrigger is a multi-stage telescopic hydraulic mechanism.

[0012] As a further improvement of the present invention, each of the jacking legs is connected to the clamping box via a hinged structure.

[0013] As a further improvement of the present invention, the hinge structure includes a fork lug, a pin, and an ear ring. The fork lug is disposed on the clamping box, and the end of the push-in leg is provided with an ear ring that cooperates with the fork lug. The pin passes through the fork lug and the ear ring.

[0014] As a further improvement of the present invention, the guide anti-torsion mechanism is an elastic damping element, and the two ends of the elastic damping element are respectively connected to the clamping box and the jacking leg.

[0015] The present invention also provides a jacking method for adapting to various cross-sections, based on the aforementioned jacking device for adapting to root keys of various cross-sections, comprising the following steps: S1: Select the clamping surface according to the cross-sectional shape and size of the root key to be jacked in, place the root key in the clamping assembly, adjust the distance between the two relative clamping blocks so that the clamping surface fits the root key surface, and lock it through the locking structure. S2: Adjust the vertical position of the support component to support the bottom of the root key; S3: Move the jacking device to the set position so that the ends of each jacking leg abut against the pile hole wall and adapt to the unevenness of the hole wall through the hinge structure; S4: Drives a multi-stage telescopic hydraulic mechanism to extend each jacking leg synchronously along the jacking direction. At the same time, the guide anti-torsion mechanism constrains each jacking leg to move only along the jacking direction to prevent deflection and misalignment. The reaction force of the jacking legs is used to push the clamping box and root key into the soil until the set lateral depth is reached.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This device uses clamping components to stably clamp and support root keys of steel sections or non-steel sections of different specifications. Combined with telescopic jacking legs and a guiding anti-torsion mechanism, it enables a single device to adapt to multiple root key sections while ensuring accurate jacking direction. This solves the problems of poor versatility and easy deflection of traditional devices, significantly improving construction efficiency and jacking accuracy. The movable connection allows the support base to automatically adapt to uneven support surfaces (such as the pile hole wall or ground), thereby preventing the jacking legs from slipping due to local suspension or tilting during jacking.

[0017] Preferably, by utilizing clamping surfaces with adjustable spacing and adaptability to different cross-sections, the device can quickly adapt to various root key shapes such as square, circular, and conical, without the need to change clamps, thus improving the flexibility of the construction site and the utilization rate of the equipment.

[0018] Preferably, a dual lead screw synchronous mechanism with gear transmission is used, which can quickly and accurately adjust and lock the clamping distance, ensuring that the root key does not slip under large jacking force, and is simple and reliable to operate, adapting to the needs of batch operation.

[0019] Preferably, different clamping surface options can directly match different root key profiles, increase the contact area, reduce local stress, prevent root key surface damage, and improve jacking stability.

[0020] Preferably, by adjusting the support height to make the center of gravity of the root key coincide with the jacking axis, the eccentric bending moment that causes skewing is avoided. At the same time, it can accommodate root keys of different lengths, thus enhancing the load-bearing adaptability of the device to root keys of different specifications.

[0021] Preferably, the multi-stage hydraulic cylinder structure provides a larger jacking stroke and thrust, while allowing for graded control of jacking speed and force to meet jacking requirements under different geological conditions, thereby improving the working capacity and controllability of the device.

[0022] Preferably, the hinged connection allows the jacking legs to swing slightly in the plane perpendicular to the jacking direction, so that each jacking leg can automatically adapt to the uneven pile hole wall, ensuring that all jacking legs push synchronously and avoiding uneven load due to local suspension.

[0023] Preferably, this hinged connection has a simple structure, strong load-bearing capacity, and is easy to disassemble and maintain. While ensuring that the jacking outriggers can swing flexibly, it can reliably transmit the jacking reaction force and adapt to harsh construction environments.

[0024] Preferably, the elastic damping element not only constrains the rotation of the jacking outriggers around their own axis, but also allows for slight elastic deformation to absorb impact, effectively preventing the jacking outriggers from twisting and misaligning during the jacking process, and ensuring the linearity of the synchronous jacking of multiple jacking outriggers.

[0025] This jacking method, through the steps of clamping surface selection, spacing adjustment, support positioning, hinge self-adaptation, and synchronous jacking, realizes the entire process of accurately jacking root keys of different cross sections from small pile holes, greatly expanding the application range of the device in narrow spaces and improving the reliability and efficiency of small pile diameter foundation construction. Attached Figure Description

[0026] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and are not intended to specifically limit the shapes and proportions of the components. In the drawings: Figure 1 This is a schematic diagram of a structure for adapting to root key jacking devices with various cross-sections, as shown in Example 1. Figure 2 This is a schematic diagram of the extended state of a root key jacking device adapted to various cross-sections in Example 1; Figure 3 This is a schematic diagram of a structure for adapting to root key jacking devices with various cross-sections, as shown in Example 1. Figure 4 This is a schematic diagram of the clamping assembly with a planar clamping surface in Example 1; Figure 5 This is a schematic diagram of the clamping assembly with a semi-cylindrical clamping surface in Example 1; Figure 6 This is a schematic diagram of the clamping assembly with a semi-conical clamping surface in Example 1; Figure 7 This is a schematic diagram of the supporting component in Example 1.

[0027] The components include: 1. Clamping box; 11. Top plate; 12. Left side plate; 13. Right side plate; 14. Bottom plate; 15. Back plate; 2. Clamping assembly; 21. Clamping block; 22. Wedge slider; 23. Transmission rod; 24. Lead screw; 3. Support assembly; 31. Support block; 32. Supporting wedge slider; 33. Supporting lead screw; 4. Push-in support leg; 41. Multi-stage telescopic hydraulic mechanism; 42. Support seat; 43. Guide anti-torsion mechanism. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0029] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Example 1 like Figure 1 As shown, this embodiment provides a jacking device for adapting to root keys with various cross-sections, including a clamping box 1 and jacking legs 4; the clamping box 1 is formed by a top plate 11, a left side plate 12, a right side plate 13, a bottom plate 14 and a back plate 15, and a clamping assembly 2 is provided inside it. The clamping assembly 2 is used to clamp and support root keys of different cross-section specifications of steel or non-steel; a number of jacking legs 4 are arranged circumferentially on the clamping box 1, and a support seat 42 is movably connected to one end of the jacking leg 4. The jacking legs 4 can all extend and retract along the jacking direction, and a guide anti-torsion mechanism 43 is provided between the jacking legs 4. The guide anti-torsion mechanism 43 is used to constrain the extension and retraction of the jacking legs 4 along the jacking direction.

[0032] like Figure 2-3 As shown, the jacking outrigger 4 is a multi-stage telescopic hydraulic mechanism 41. The multi-stage telescopic hydraulic mechanism 41 acts on the clamping box 1 along the jacking direction to drive the clamping box 1 and the structural steel or non-structural steel roots inside to jack forward. The effective jacking stroke of the multi-stage telescopic hydraulic mechanism 41 is not less than 500mm.

[0033] Each jacking outrigger 4 is connected to the clamping housing 1 via a hinged structure. The fixed end of the multi-stage telescopic hydraulic mechanism 41 is connected to the clamping housing 1 via a hinged structure. The hinged structure is used to allow the multi-stage telescopic hydraulic mechanism 41 to generate a swing angle compensation relative to the clamping housing 1 during the jacking process, thereby reducing the off-center load on the piston rod of the multi-stage telescopic hydraulic mechanism 41 caused by installation errors or attitude changes during the jacking process.

[0034] The hinge structure includes a fork-shaped lug seat, a pin, and a clevis. The fork-shaped lug seat is mounted on the clamping housing 1, and the end of the jacking leg 4 is provided with a clevis that mates with the fork-shaped lug seat. The pin passes through the fork-shaped lug seat and the clevis. Specifically, the fork-shaped lug seat includes two parallel lug plates. This fork-shaped hinge structure allows the multi-stage telescopic hydraulic mechanism 41 to swing relative to the clamping housing 1 within a certain angle range during the jacking process. This compensates for the angular deviation between the multi-stage telescopic hydraulic mechanism 41 and the clamping housing 1 caused by installation errors or attitude changes during the jacking process, prevents the piston rod from bending, improves the stability of the jacking process, and extends the service life of the multi-stage telescopic hydraulic mechanism 41.

[0035] The guide anti-torsion mechanism 43 is an elastic damping element, with its two ends connected to the clamping housing 1 and the jacking leg 4, respectively. The guide anti-torsion mechanism 43 is positioned between the jacking leg 4 and the clamping housing 1 to limit the movement of the clamping housing 1 only along the jacking direction and restrict its rotation around the vertical axis in the horizontal plane. During the jacking process, due to changes in the relative positional relationship between the clamping housing 1 and the jacking leg 4, a certain angle is allowed between them. By providing a hinge structure between the jacking leg 4 and the clamping housing 1, the jacking leg 4 can adaptively change the angle, providing only the jacking thrust to the clamping housing 1 without adversely affecting its posture.

[0036] like Figure 4 As shown, the clamping assembly 2 includes at least two opposing clamping blocks 21. The two clamping blocks 21 are arranged opposite each other to clamping surfaces suitable for steel sections or non-steel root keys of different cross-sectional specifications, and the distance between them is adjustable.

[0037] Two opposing clamping blocks 21 each have a wedge-shaped slider 22 on their outer side. The wedge-shaped slider 22 is threadedly connected to a lead screw 24 passing through it. Both lead screws 24 are gear-driven connected to a transmission rod 23. Specifically, the connection end between the lead screw 24 and the transmission rod 23 is a bevel gear pair, preferably a spur bevel gear pair. The wedge-shaped slider 22 is arranged horizontally, and there is a wedge-shaped surface between the wedge-shaped slider 22 and the clamping block 21 that cooperates with each other. The horizontal displacement of the wedge-shaped slider 22 is converted into the clamping displacement of the clamping block 21 through the action of the wedge-shaped surface. The lead screws 24 on the left and right sides are synchronously adjusted through the transmission rod 23, which is connected to the lead screws 24 on the left and right sides respectively through bevel gear pairs. In one embodiment, by rotating the transmission rod 23, the lead screws 24 on the left and right sides are simultaneously driven to rotate, so that the wedge-shaped sliders 22 on the left and right sides move synchronously in the horizontal direction, thereby realizing the synchronous clamping or synchronous release of the root key web of the steel or non-steel. In this embodiment, the transmission rod 23 is mainly used for adjusting the clamping position. Its clamping force is transmitted through the clamping block 21 and the clamping box 1. The lead screw 24 does not bear the main load during the jacking process, thereby improving the reliability and durability of the adjustment mechanism.

[0038] A locking structure is provided on the lead screw 24 or the transmission rod 23. The locking structure on the lead screw 24 or the transmission rod 23 can be a pin type, in which a pin hole is opened on the rod body and a positioning pin is inserted to prevent rotation; or it can be an electromagnetic brake type, in which friction plates grip the rod body when power is off.

[0039] The clamping surface is planar or semi-cylindrical (e.g.) Figure 5 As shown), hemispherical or semi-conical (such as) Figure 6 As shown, the clamping surface can also be designed according to the cross-section of the non-shaped steel root key to fit the shape of the non-shaped steel root key cross-section. Figure 1 The clamping surfaces shown are suitable for I-beam profiles.

[0040] like Figure 1 and Figure 7 As shown, the clamping assembly 2 includes a support assembly 3 disposed on the bottom side of the clamping assembly 2, and the support assembly 3 is vertically adjustable. In a preferred embodiment, the support assembly 3 includes a support block 31, a support wedge slider 32, and a support screw 33. The support wedge slider 32 is disposed below the support block 31 and can move horizontally. The support screw 33 is horizontally disposed on the side of the clamping housing 1 and is used to drive the support wedge slider 32 to move horizontally, thereby driving the support block 31 to adjust its position vertically through the action of the wedge surface. In use, the support block 31 is disposed below the lower flange of the root key of the structural steel or non-structural steel, the support wedge slider 32 is disposed below the support block 31 and is installed at the bottom of the clamping housing 1 through the support screw 33, and the support wedge slider 32 and the support block 31 are provided with mutually cooperating wedge surfaces. By rotating the support screw 33 located at the bottom of the clamping housing 1, the support wedge-shaped slider 32 is driven to move horizontally. Then, through the action of the wedge-shaped surface, the support block 31 is adjusted vertically, causing it to fit against the lower flange of the steel or non-steel root key to form a stable support. After adjustment, the support wedge-shaped slider 32 is fixed by a locking structure. Its load-bearing capacity is transmitted to the clamping housing 1 structure through the support block 31. The support screw 33 is only used for position adjustment and does not bear the main load during the jacking process.

[0041] With the above structural setup, stable jacking construction of steel or non-steel root keys with different cross-sections can be completed simply by adjusting the clamping assembly 2 without changing the main structure of the jacking device. The clamping box 1 structure provides overall constraint for the steel or non-steel root keys, decoupling the positioning and guidance of the steel or non-steel root keys from the jacking action during the jacking process. Before jacking, the steel or non-steel root keys are placed inside the clamping box 1, and their web and lower flange are clamped and supported by the clamping assembly 2, keeping the steel or non-steel root keys relatively fixed within the clamping box 1, thereby preventing lateral or vertical displacement of the steel or non-steel root keys relative to the clamping box 1 during the jacking process.

[0042] The present invention also provides a method for adapting to various cross-section jacking methods, comprising the following steps: S1: Select the clamping surface according to the cross-sectional shape and size of the root key to be jacked in, place the root key in the clamping assembly 2, adjust the distance between the two relative clamping blocks 21 so that the clamping surface fits with the root key surface, and lock it through the locking structure. S2: Adjust the vertical position of the support component 3 to support the bottom of the root key; S3: Move the jacking device to the set position so that the ends of each jacking leg 4 abut against the pile hole wall and adapt to the unevenness of the hole wall through the hinge structure; S4: Drive the multi-stage telescopic hydraulic mechanism 41 to make each jacking leg 4 extend synchronously along the jacking direction. At the same time, the guide anti-torsion mechanism 43 constrains each jacking leg 4 to move only along the jacking direction to prevent deflection and misalignment. Use the reaction force of the jacking leg 4 to push the clamping box 1 and the root key into the soil until the set lateral depth is reached.

[0043] After completing the jacking method, release the clamping assembly 2, retract the jacking support legs 4 in sequence, and remove the device from the jacking station.

[0044] Example 2 The difference between this embodiment and Embodiment 1 is that: 1) The pin can be equipped with a bushing structure. The bushing is preferably a wear-resistant metal bushing or a self-lubricating bushing to reduce wear between the pin and the ear plate and facilitate later replacement.

[0045] 2) A stiffening rib is provided between the fork lug seat and the clamping box to reliably transmit the jacking reaction force generated by the multi-stage telescopic hydraulic mechanism to the main body of the clamping box.

[0046] The workflow in this embodiment includes the following steps: S1. Adjust the clamping components inside the clamping box according to the cross-sectional specifications of the steel or non-steel root key to be constructed, so that they match the position of the outer side plate or edge and the height of the lower flange of the steel or non-steel root key. S2. Place the steel or non-steel root key inside the clamping box, and clamp and support the steel or non-steel root key through the clamping assembly, so that the steel or non-steel root key is relatively fixed inside the clamping box. S3. Connect the clamping box to the upper fixed platform. The platform can be a drilling machine, etc. After connection, position the clamping box and move it vertically to the horizontal plane of the root key jacking position. S4. Open the horizontal guide anti-torsion mechanism and spread the jacking legs to both sides until the jacking legs move to the predetermined position in the jacking direction to prevent steel cages or other objects from being present in the extension direction of the jacking mechanism. S5. Start the jacking outriggers, so that the multi-stage telescopic hydraulic mechanism set in the circumference of the fixed installation frame can synchronously or differentially apply the jacking thrust to the clamping box, driving the clamping box and the steel or non-steel root key as a whole to move along the jacking direction. S6. During the jacking process, the movement direction and posture of the clamping box are constrained by the guide anti-torsion mechanism to prevent the clamping box from shifting laterally or twisting horizontally. S7. Once the steel or non-steel root key has been pushed to the designed position, stop the pushing outriggers, release the clamping components, and complete the root key construction.

[0047] In other embodiments, the control method of the jacking outriggers, the jacking rhythm, and the adjustment method of the clamping components can be adjusted according to construction needs.

[0048] Compared with the prior art, the present invention has at least the following effects: The clamping box structure is used to clamp and support the root keys of the steel or non-steel as a whole, so that the posture of the root keys of the steel or non-steel is stable during the jacking process. The adjustable clamping components enable the same device to be adapted to various structural steel or non-structural steel root keys with different cross-sectional specifications, thus improving the device's versatility. By combining multi-point hydraulic jacking with a guide anti-torsion mechanism, lateral deviation and horizontal torsion during the jacking process are suppressed; The device has a compact structure and is suitable for construction spaces with small pile diameters. The articulated connection allows the multi-stage telescopic hydraulic mechanism to adapt to changes in rotation angle during jacking, reducing additional load.

[0049] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A jacking device for adapting to root keys with various cross-sections, characterized in that, It includes a clamping box (1) and jacking legs (4); the clamping box (1) is equipped with a clamping assembly (2) inside, which is used to clamp and support steel or non-steel root keys of different cross-sectional specifications; the clamping box (1) is circumferentially provided with a number of jacking legs (4), one end of the jacking leg (4) is movably connected to a support seat (42), the jacking legs (4) can all extend and retract along the jacking direction, and a guide anti-torsion mechanism (43) is provided between the jacking legs (4), the guide anti-torsion mechanism (43) is used to constrain the extension and retraction of the jacking legs (4) along the jacking direction.

2. The jacking device for adapting to root keys with various cross-sections according to claim 1, characterized in that, The clamping assembly (2) includes at least two opposing clamping blocks (21), which are arranged opposite each other to clamping surfaces suitable for steel sections or non-steel root keys of different cross-sectional specifications, and the distance between them is adjustable.

3. A root key jacking device for adapting to various cross-sections according to claim 2, characterized in that, Both of the two opposing clamping blocks (21) are provided with wedge-shaped sliders (22) on their outer sides. The wedge-shaped sliders (22) are threadedly connected to a lead screw (24) passing through them. Both lead screws (24) are gear-driven connected to a transmission rod (23). The lead screws (24) or the transmission rod (23) are provided with locking structures.

4. A root key jacking device for adapting to various cross-sections according to claim 2, characterized in that, The clamping surface can be planar, semi-cylindrical, hemispherical, or semi-conical.

5. A root key jacking device for adapting to various cross-sections according to claim 1, characterized in that, The clamping assembly (2) includes a support assembly (3) disposed on the bottom side of the clamping assembly (2), and the support assembly (3) is adjustable in vertical position.

6. A root key jacking device for adapting to various cross-sections according to claim 1, characterized in that, The jacking outrigger (4) is a multi-stage telescopic hydraulic mechanism (41).

7. A root key jacking device for adapting to various cross-sections according to claim 1, characterized in that, Each of the jacking legs (4) is connected to the clamping box (1) via a hinge structure.

8. A root key jacking device for adapting to various cross-sections according to claim 7, characterized in that, The hinge structure includes a fork lug, a pin, and an ear ring. The fork lug is disposed on the clamping box (1). The end of the push-in leg (4) is provided with an ear ring that cooperates with the fork lug. The pin passes through the fork lug and the ear ring.

9. A root key jacking device for adapting to various cross-sections according to claim 1, characterized in that, The guide anti-torsion mechanism (43) is an elastic damping component, and the two ends of the elastic damping component are respectively connected to the clamping box (1) and the jacking leg (4).

10. A jacking device for adapting to multiple cross-section jacking methods, based on any one of claims 1 to 9, characterized in that, Includes the following steps: S1: Select the clamping surface according to the cross-sectional shape and size of the root key to be jacked in, place the root key in the clamping assembly (2), adjust the distance between the two relative clamping blocks (21) so that the clamping surface fits against the root key surface and is locked by the locking structure. S2: Adjust the vertical position of the support component (3) to support the bottom of the root key; S3: Move the jacking device to the set position so that the ends of each jacking leg (4) abut against the pile hole wall and adapt to the unevenness of the hole wall through the hinge structure; S4: Drive the multi-stage telescopic hydraulic mechanism (41) to make each jacking leg (4) extend synchronously along the jacking direction. At the same time, the guide anti-torsion mechanism (43) constrains each jacking leg (4) to move only along the jacking direction to prevent deflection and misalignment. Use the reaction force of the jacking leg (4) to push the clamping box (1) and root key into the soil until the set lateral depth is reached.

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