Secondary-expansion variable-diameter rooting pile connector and pipe pile thereof

Abstract

The invention relates to the technical field of tubular piles, and discloses a secondary expansion variable-diameter rooting pile connector which comprises a pile connector body and a shearing force tongue root plate, a moving hole for the shearing force tongue root plate to pass through is formed in the pile connector body, and the shearing force tongue root plate is slidably connected into the moving hole. The pile connector body is provided with an operation hole for an operation hammer to penetrate through, the shearing force tongue root plate is connected with a tongue root extension plate in a sliding mode, and the shearing force tongue root plate is provided with a linkage assembly used for pushing the tongue root extension plate. The extension tongue root plate is driven by the shearing force tongue root plate through the linkage assembly to move, so that the extension tongue root plate can increase the protruding distance of the shearing force tongue root plate without increasing the length of the shearing force tongue root plate, and then the contact area between the extension tongue root plate and the shearing force tongue root plate and soil can be increased when the extension tongue root plate and the shearing force tongue root plate protrude; and the soil area sheared by the extension tongue root plate is larger, so that the pipe pile can be fixed in soil more firmly.

Description

Technical Field

[0001] The present application relates to the technical field of pipe piles, and in particular to a pile joint capable of secondary expansion and variable diameter rooting and a pipe pile thereof. Background Art

[0002] Pipe piles refer to piles whose bottom is located in a softer soil layer. Their axial load is supported by the friction resistance on the pile side and the reaction force of the soil at the pile bottom, and the friction resistance on the pile side plays the main supporting role. Pipe piles are mainly used in foundations buried very deep in rock strata.

[0003] In the related art, the pipe pile includes a pipe pile and a pile joint. The pile joint includes a pile joint body and a plurality of shear force tongue root plates. The pile joint body is arranged on the pipe pile. A movable hole for the shear force tongue root plate to pass through is opened on the pile joint body. An operating hole is opened on the pipe pile. The operating hole penetrates through the pile joint body. An operating hammer is slidably connected in the operating hole.

[0004] When the operating hammer is inserted into the operating hole, the operating hammer pushes the shear force tongue root plate to protrude from the moving hole, so that the shear force tongue root plate is inserted into the soil.

[0005] Due to the limited diameter and length of the pipe pile, the overall length of the shear tongue root plate in the pipe pile is limited, resulting in a limited protruding path of the shear tongue root plate when the operating hammer is inserted into the operating hole, which in turn limits the distance the shear tongue root plate can be inserted into the soil. This limits the force between the shear tongue root plate and the soil layer, which may cause the pipe pile to loosen in the soil layer. Summary of the invention

[0006] In order to improve the shear force, the distance that the tongue root plate is inserted into the soil is limited. The present application provides a pile joint with a secondary expansion and variable diameter rooting and a pipe pile thereof.

[0007] The present application provides a secondary expansion variable diameter rooting pile joint and a pipe pile thereof, which adopts the following technical solution: A pile joint with secondary expansion and variable diameter rooting, the pile joint comprising a pile joint body and a shear force tongue root plate, the pile joint body is provided with a movable hole for the shear force tongue root plate to pass through, the shear force tongue root plate is slidably connected in the movable hole, the pile joint body is provided with an operating hole for an operating hammer to pass through, the shear force tongue root plate is slidably connected with an extended tongue root plate, the shear force tongue root plate is provided with a linkage component for pushing the extended tongue root plate; when the shear force tongue root plate protrudes from the movable hole, the linkage component can push the extended tongue root plate to protrude from the shear force tongue root plate.

[0008] By adopting the above technical solution, the shear force tongue root plate protrudes through the moving hole, and the shear force tongue root plate drives the extension tongue root plate to move through the linkage component, so that the extension tongue root plate can protrude the shear force tongue root plate, thereby extending the tongue root plate and inserting it into the soil, so that the extension tongue root plate can increase the protruding distance of the shear force tongue root plate without increasing the length of the shear force tongue root plate, thereby allowing the extension tongue root plate and the shear force tongue root plate to increase the contact area with the soil when protruding, so that the soil area sheared by the extension tongue root plate is larger, and the pipe pile can be more firmly fixed in the soil.

[0009] Optionally, the linkage assembly includes a first linkage bar, a second linkage bar and a third linkage bar, the first linkage bar and the third linkage bar are respectively rotatably connected to different ends of the second linkage bar, the third linkage bar is rotatably connected to the pile joint body, and the first linkage bar is rotatably connected to the extended tongue root plate; when the shear force tongue root plate protrudes from the moving hole, the extended tongue root plate protrudes from the shear force tongue root plate.

[0010] By adopting the above technical solution, when the shear force tongue root plate protrudes from the moving hole, since the third linkage bar is rotatably connected to the pile joint body, the third linkage bar can drive the second linkage bar to move, and the first linkage bar and the third linkage bar are respectively rotatably connected to different ends of the second linkage bar, so that the second linkage bar drives the first linkage bar to rotate, and since the first linkage bar is rotatably connected to the extended tongue root plate, the first linkage bar can drive the extended tongue root plate to move, so that the extended tongue root plate can protrude from the shear force tongue root plate, so that the shear force tongue root plate drives the extended tongue root plate to move through the linkage assembly, so that the extended tongue root plate can protrude from the shear force tongue root plate.

[0011] Optionally, an extended inclined surface is provided on the surface of the extended tongue root plate away from the operating hole, and the distance between the extended inclined surface and the operating hole gradually increases along the insertion direction of the operating hammer.

[0012] By adopting the above technical solution, the distance between the extended inclined surface and the operating hole is gradually increased along the insertion direction of the operating hammer, so that the extended inclined surface can push the soil block to one side, allowing the extended tongue root plate to push the soil block more easily, so that the extended tongue root plate can move on the shear force tongue root plate.

[0013] Optionally, a sliding groove is provided on the surface of the shear force tongue root plate, and the extended tongue root plate is slidably connected in the sliding groove.

[0014] By adopting the above technical solution, the extended tongue root plate is slidably connected in the sliding groove, so that the extended tongue root plate can be supported by the sliding groove wall, so that the shear force tongue root plate can support the extended tongue root plate, so that the extended tongue root plate can be more stably inserted into the soil block, reducing the damage to the extended tongue root plate.

[0015] Optionally, a fixing component is provided between the shear force tongue root plate and the extended tongue root plate, and the fixing component is used to increase the supporting force of the shear force tongue root plate on the extended tongue root plate.

[0016] By adopting the above technical solution, the supporting force of the shear root plate on the extended tongue root plate can be increased through the fixing assembly, so that the extended tongue root plate is not easily bent when protruding, so that the extended tongue root plate can be better inserted into the soil.

[0017] Optionally, the fixing assembly includes a fixing block and a fixing groove, the fixing block is arranged on the shear force tongue root plate, the fixing groove is opened on the extended tongue root plate, and the fixing block is located in the fixing groove.

[0018] By adopting the above technical solution, the fixing block is placed in the fixing groove, and the groove wall of the fixing groove supports the fixing block, so that the contact area between the extended tongue root plate and the shear force tongue root plate is increased, so that the extended tongue root plate can withstand a greater force and reduce the possibility of breakage of the extended tongue root plate.

[0019] Optionally, a pop-up spring is provided on the movable hole, a pop-up block is provided on the pop-up spring, a pop-up groove for inserting the pop-up block is provided on the shear force tongue root plate, and the pop-up spring drives the pop-up block to be inserted into the pop-up groove; when the pop-up block is inserted into the pop-up groove, the shear force tongue root plate protrudes from the movable hole.

[0020] By adopting the above technical solution, the pop-up block is driven to move by the pop-up spring, and the pop-up block is inserted into the pop-up groove, so that the pop-up block can limit the shear force tongue root plate, thereby allowing the pop-up block to restrict the movement of the shear force tongue root plate in the moving hole, so that the shear force tongue root plate can be more stably inserted into the soil.

[0021] Optionally, an annular groove is provided on the pile joint body, a support plate is provided in the annular groove, the movable hole is provided on the support plate, and a filler is provided in the annular groove.

[0022] By adopting the above technical solution, the filler is arranged in the annular groove, so that the filler can increase the structural strength of the pile joint body. At the same time, the support plate is arranged in the annular groove, so that the support plate further increases the structural strength of the pile joint body, making the pile joint body less susceptible to damage, thereby reducing the damage to the pile joint body caused by external soil blocks.

[0023] Optionally, a plurality of frames are provided in the annular groove, and the frames are located between the fillers.

[0024] By adopting the above technical solution, the skeleton is located between the fillers, so that the skeleton can support the fillers, making it difficult for external objects to cause damage to the pile joint body, and further increasing the overall structural strength of the pile joint body.

[0025] A pile joint for secondary expansion and variable diameter rooting and its pipe pile, also include a pipe pile and a pile joint, the pile joint body is arranged on the pipe pile, an operating hammer is provided on the pipe pile, an external thread is provided on the surface of the operating hammer, an operating hole for the operating hammer to pass through is opened on the pipe pile, and a groove for the external thread to be inserted is opened on the shear force tongue root plate; when the operating hammer rotates and falls, the shear force tongue root plate protrudes from the pile joint body.

[0026] By adopting the above technical solution, an operating hammer is inserted into the groove, and as the operating hammer is rotated and squeezed, the external thread can drive the shear force tongue root plate to move, so that the shear force tongue root plate can protrude from the pile joint body. By rotating the operating hammer, the shear force tongue root plate can gradually protrude along the thread direction of the external thread, so that the shear force tongue root plate will not be suddenly inserted into the soil, reducing the instantaneous force on the shear force tongue root plate, so that the shear force tongue root plate can be more securely inserted into the soil.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. The shear force tongue root plate protrudes through the moving hole, and the shear force tongue root plate drives the extension tongue root plate to move through the linkage component, so that the extension tongue root plate can protrude from the shear force tongue root plate, thereby extending the tongue root plate and inserting it into the soil, so that the extension tongue root plate can increase the protruding distance of the shear force tongue root plate without increasing the length of the shear force tongue root plate, thereby allowing the extension tongue root plate and the shear force tongue root plate to increase the contact area with the soil when protruding, so that the pipe pile can be more securely fixed in the soil.

[0028] 2. By placing the fixing block in the fixing groove, the groove wall of the fixing groove supports the fixing block, so that the contact area between the extended tongue root plate and the shear force tongue root plate is increased, so that the extended tongue root plate can withstand a greater force and reduce the possibility of fracture of the extended tongue root plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of Example 1; Figure 2 is a schematic structural diagram highlighting the pile joint in Example 1; Figure 3 is a schematic diagram of the structure of the shear force tongue root plate in the initial state in Example 1; Figure 4 is a schematic structural diagram of the operating hammer in Example 1; Figure 5 is a cross-sectional view of the operating hammer in Example 1; Figure 6 is an exploded schematic diagram highlighting the extended tongue root plate in Example 1; Figure 7is an exploded schematic diagram highlighting the ring plate in Example 1; Figure 8 is a schematic diagram of the structure highlighting the skeleton in Example 1; Fig. 9 yes Figure 8 A magnified schematic diagram of part A; Fig.10 is a partial cross-sectional view highlighting the accommodation groove in Embodiment 1; Fig.11 is a schematic diagram of the structure of the highlighted placement block in Example 1; Fig.12 is a schematic diagram of the structure of the highlighted placement block in Example 2; Fig.13 is a structural schematic diagram highlighting the accommodation bar in Example 3; Fig.14 It is a schematic diagram of the structure of the highlighting accommodation bar in Example 4.

[0030] Reference numerals: 1, pipe pile; 11, operating hole; 2, pile joint; 21, pile joint body; 211, moving hole; 22, shear force tongue root plate; 221, groove; 222, pop-up groove; 223, sliding groove; 224, moving inclined plane; 23, extended tongue root plate; 231, extended inclined plane; 24, annular groove; 241, annular plate; 25, accommodating groove; 251, pop-up spring; 252, pop-up block; 3, pile head; 31, placement block; 311, Movable groove; 312, fixed bar; 32, accommodating bar; 321, accommodating inclined plane; 4, fixed component; 41, fixed block; 42, fixed groove; 43, clamping block; 44, clamping groove; 5, linkage component; 51, first linkage bar; 52, second linkage bar; 53, third linkage bar; 6, support plate; 61, skeleton; 611, reinforcement plate; 612, perforation; 7, operating hammer; 71, round groove; 72, round ball; 73, operating bar; 74, perforation;. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-14 This application is described in further detail.

[0032] Example 1 This embodiment discloses a pile joint with variable diameter rooting for secondary expansion and a pile pipe thereof. Figure 1 and Figure 2 A pile joint for secondary expansion and variable diameter rooting and its pipe pile, comprising a plurality of pipe piles 1, a plurality of pile joints 2 and a pile head 3, wherein the pipe pile 1 can be integrally formed in the pile joint 2, and the plurality of pile joints 2 can be arranged adjacent to each other. In this embodiment, the plurality of pile joints 2 are respectively welded to the pipe pile 1. The pile head 3 can be welded to the pile joint 2 or the pipe pile 1. The pipe pile 1 has a plurality of steel bars in it to increase the structural strength of the pipe pile 1. The pipe pile 1 is provided with an operating hammer 7, which can be called a rotary spiral cone hammer.

[0033] Reference Figure 1 and Figure 2 , the pile joint 2 includes a pile joint body 21 and a plurality of shear force tongue root plates 22. In this embodiment, the pipe pile 1 and the pile joint body 21 are both cylindrical. In other embodiments, the pipe pile 1 and the pile joint body 21 may be in the shape of a polygonal column or the like; or, the outer surfaces of the pipe pile 1 and the pile joint body 21 may be in a folded shape. A high-strength rib skeleton may be provided inside the shear force tongue root plate 22, and cement, resin or other materials may be cast on the outside; in other embodiments, the shear force tongue root plate 22 may be made of materials such as steel. The pipe pile 1 may be welded to the pile joint body 21, and two adjacent pile joint bodies 21 may be fixed by welding, and the gap between the pipe pile 1 and the pile joint body 21 may be filled with cement or other high-strength liquid solidifiable materials.

[0034] Reference Figure 1 and Figure 2 , a movable hole 211 is provided on the pile joint body 21 for the shear force tongue root plate 22 to pass through. In this embodiment, the movable hole 211 is horizontally arranged. In other embodiments, the movable hole 211 can be inclined between a direction away from the axis of the pile joint body 21 and a direction toward the ground. An operating hole 11 is provided on the surface of the pipe pile 1 for the operating hammer 7 to be inserted, and the operating hole 11 penetrates the surface of the pile joint body 21. The shear force tongue root plate 22 extending out of the movable hole 211 can increase the cross-sectional area of ​​the pile joint body 21, and the number of the shear force tongue root plate 22 can be set according to different needs.

[0035] Reference Figure 1 , Figure 2 and Figure 3 , a groove 221 is provided on the surface of the shear force tongue root plate 22, and the groove 221 is for the operating hammer 7 to pass through. When the shear force tongue root plate 22 is located in the operating hole 11, multiple grooves 221 form a circle for the operating hammer 7 to pass through, and the operating hammer 7 can be inserted into the groove 221 to drive the shear force tongue root plate 22 to move. In this embodiment, the shear force tongue root plate 22 is fan-shaped, and in other embodiments, the shear force tongue root plate 22 can be other shapes, or the shear force tongue root plate 22 can be provided with multiple through holes, and the through holes are for the soil block to pass through.

[0036] Reference Figure 4 An external thread is provided on the outer surface of the operating hammer 7, and a plurality of circular grooves 71 are provided on the operating hammer 7. The plurality of circular grooves 71 are distributed in an array along the thread direction of the external thread.

[0037] Reference Figure 3 , Figure 4 and Figure 5A ball 72 is rotatably connected to the circular groove 71, and an operating bar 73 is fixedly connected to the operating hammer 7. The operating bar 73 can be fixed to the operating hammer 7 along the external thread. A through hole 74 is provided on the surface of the operating bar 73. The through hole 74 allows the ball 72 to pass through, and the diameter of the through hole 74 is smaller than the diameter of the ball 72. The ball 72 can rotate in the circular groove 71, and the ball 72 can abut against the groove 221 of the shear force tongue root plate 22. The operating hammer 7 can rotate and fall, and the operating hammer 7 is inserted into the groove 221, so that the shear force tongue root plate 22 gradually protrudes from the pile joint body 21 along the external thread, and the shear force tongue root plate 22 moves from the contracted state to the extended state.

[0038] Reference Figure 6 , a sliding groove 223 is provided on the surface of the shear force tongue root plate 22, and the extended tongue root plate 23 is slidably connected in the sliding groove 223. A fixing component 4 is provided between the extended tongue root plate 23 and the sliding groove 223, and the fixing component 4 is used to support the extended tongue root plate 23. The fixing component 4 includes a fixing block 41 and a fixing groove 42, and the fixing block 41 can slide in the fixing groove 42. In this embodiment, the fixing block 41 is arranged on the shear force tongue root plate 22, and the fixing groove 42 is provided on the extended tongue root plate 23. In other embodiments, the fixing block 41 may be arranged on the extended tongue root plate 23, and the fixing groove 42 may be provided on the shear force tongue root plate 22.

[0039] Reference Figure 6 Two clamping blocks 43 are integrally formed on the surface of the fixing block 41, and two clamping grooves 44 are provided on the groove wall of the fixing groove 42, and the clamping grooves 44 are for the clamping blocks 43 to slide. When the fixing block 41 is located in the fixing groove 42, the clamping block 43 is located in the clamping groove 44.

[0040] Reference Figure 2 and Figure 6 The shear force tongue root plate 22 is provided with two linkage components 5, and the linkage components 5 are used to push the extended tongue root plate 23. The linkage component 5 includes a first linkage bar 51, a second linkage bar 52 and a third linkage bar 53, one end of the second linkage bar 52 is rotatably connected to the first linkage bar 51, and the other end of the second linkage bar 52 is rotatably connected to the third linkage bar 53. The third linkage bar 53 is rotatably connected to the pile joint body 21, and the first linkage bar 51 is rotatably connected to the extended tongue root plate 23.

[0041] Reference Figure 2 and Figure 6 When the shear force tongue root plate 22 protrudes from the moving hole 211, the shear force tongue root plate 22 drives the third linkage bar 53 to rotate. At this time, the third linkage bar 53 drives the second linkage bar 52 to move, allowing the second linkage bar 52 to rotate, and the second linkage bar 52 drives the first linkage bar 51 to rotate, so that the extended tongue root plate 23 is limited by the fixing component 4, so that the extended tongue root plate 23 can stably protrude from the shear force tongue root plate 22.

[0042] Reference Figure 2 , Figure 4 and Figure 6 An extended inclined surface 231 is provided on the surface of the extended tongue root plate 23 away from the operating hole 11, and the distance between the extended inclined surface 231 and the operating hole 11 gradually increases along the insertion direction of the operating hammer 7. A moving inclined surface 224 is provided on the surface of the shear force tongue root plate 22 away from the operating hole 11, and the distance between the moving inclined surface 224 and the operating hole 11 gradually decreases along the insertion direction of the operating hammer 7.

[0043] Reference Figure 7 An annular groove 24 is provided on the end surface of the pile joint body 21, and a plurality of support plates 6 are provided in the annular groove 24. The moving hole 211 is provided on the support plate 6. An annular plate 241 is welded on the pile joint body 21, and the annular plate 241 is used to block the opening of the annular groove 24. A lifting ring is threadedly connected to the annular plate 241, and the lifting ring facilitates the transportation of the pile joint body 21.

[0044] Reference Figure 8 A plurality of skeletons 61 are fixedly connected to the surface of the support plate 6, and the skeletons 61 are distributed in a circumferential array along the annular groove 24. A filler is provided in the annular groove 24, and the filler is located between two adjacent support plates 6, and the filler is located between adjacent skeletons 61. The filler is a high-strength object such as cement and resin, and the filler can solidify from liquid to solid to increase the structural strength of the pile joint body 21.

[0045] Reference Fig. 9 The skeleton 61 includes a reinforcing plate 611, which is folded and has a plurality of through holes 612 on its surface. The through holes 612 allow the filler to pass through, so that the connection between the filler and the reinforcing plate 611 can be more secure. In other embodiments, the reinforcing plate 611 does not have the through holes 612; or, the skeleton 61 can be a threaded rod, and the plurality of threaded rods are distributed in an array along the circumference of the support plate 6.

[0046] Reference Fig.10 The wall of the moving hole 211 is provided with a receiving groove 25, a pop-up spring 251 is fixedly connected to the bottom wall of the receiving groove 25, a pop-up block 252 is fixedly connected to the surface of the pop-up spring 251 away from the bottom wall of the receiving groove 25, and the pop-up spring 251 drives the pop-up block 252 to protrude from the receiving groove 25. When the pop-up block 252 is located in the receiving groove 25, the pop-up spring 251 is in a compressed state; when the pop-up block 252 protrudes from the receiving groove 25, the pop-up spring 251 is in a non-stressed state.

[0047] Reference Fig.10The surface of the shear force tongue root plate 22 is provided with an ejection groove 222 for the ejection block 252 to be inserted into. When the ejection block 252 is inserted into the ejection groove 222, the shear force tongue root plate 22 protrudes from the moving hole 211, and the ejection spring 251 is in a non-stressed state.

[0048] Reference Figure 4 and Figure 7 When the moving hole 211 is formed in the pipe pile 1, the outer surface of the pipe pile 1 is not penetrated. At this time, a baffle is formed at the moving hole 211, and the thickness of the baffle is relatively thin. When the operating hammer 7 abuts against the shear force tongue root plate 22, the shear force tongue root plate 22 can destroy the baffle, so that the shear force tongue root plate 22 can protrude from the moving hole 211.

[0049] Reference Fig.11 The pile head 3 includes a placement block 31, which is cylindrical and has a moving groove 311 on the surface of the placement block 31 away from the pile joint body 21. A plurality of fixing bars 312 are fixedly connected to the outer surface of the placement block 31, and the plurality of fixing bars 312 are distributed in a circumferential array along the placement block 31.

[0050] The implementation principle of Example 1 is: when the operating hammer 7 is inserted into the operating hole 11, the operating hammer 7 pushes the shear force tongue root plate 22 to protrude from the moving hole 211, and the shear force tongue root plate 22 cooperates with the first linkage bar 51, the second linkage bar 52 and the third linkage bar 53 to allow the extended tongue root plate 23 to protrude from the shear force tongue root plate 22.

[0051] Example 2 Reference Fig.12 The difference between this embodiment and the first embodiment is that the placement block 31 is conical, and the surface of the placement block 31 away from the pile joint body 21 is flat, so as to facilitate the placement of the pile head 3.

[0052] Example 3 Reference Fig.13 The difference between this embodiment and the first embodiment is that the pile head 3 includes two receiving bars 32, which are arranged in a cross shape and have a triangular longitudinal section. The surface of the receiving bar 32 away from the pile joint body 21 is a plane, so that the pile head 3 can be placed on the ground.

[0053] Example 4 Reference Fig.14 The difference between this embodiment and the first embodiment is that the pile head 3 includes two receiving bars 32, the receiving bars 32 are arranged in a cross shape, and the longitudinal section of the receiving bar 32 is a rectangle. Two receiving inclined surfaces 321 are provided on the side of the receiving bar 32.

[0054] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0055] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present application should be included in the protection scope of the present application.

Claims

1. A pile joint for secondary expansion and variable diameter rooting, the pile joint (2) comprising a pile joint body (21) and a shear force tongue root plate (22), the pile joint body (21) being provided with a moving hole (211) for the shear force tongue root plate (22) to pass through, the shear force tongue root plate (22) being slidably connected in the moving hole (211), the pile joint body (21) being provided with an operating hole (11) for an operating hammer to pass through, characterized in that: The shear force tongue root plate (22) is slidably connected to an extended tongue root plate (23), and the shear force tongue root plate (22) is provided with a linkage component (5) for pushing the extended tongue root plate (23); when the shear force tongue root plate (22) protrudes from the moving hole (211), the linkage component (5) can push the extended tongue root plate (23) to protrude from the shear force tongue root plate (22).

2. A secondary expansion variable diameter rooting pile joint according to claim 1, characterized in that: The linkage assembly (5) comprises a first linkage bar (51), a second linkage bar (52) and a third linkage bar (53); the first linkage bar (51) and the third linkage bar (53) are respectively rotatably connected to different ends of the second linkage bar (52); the third linkage bar (53) is rotatably connected to the pile joint body (21); and the first linkage bar (51) is rotatably connected to the extended tongue root plate (23); when the shear force tongue root plate (22) protrudes from the moving hole (211), the extended tongue root plate (23) protrudes from the shear force tongue root plate (22).

3. A pile joint with secondary expansion and variable diameter rooting according to claim 1, characterized in that: An extended inclined surface (231) is provided on the surface of the extended tongue root plate (23) away from the operating hole (11), and the distance between the extended inclined surface (231) and the operating hole (11) gradually increases along the insertion direction of the operating hammer (7).

4. A pile joint with secondary expansion and variable diameter rooting according to claim 1, characterized in that: A sliding groove (223) is provided on the surface of the shear force tongue root plate (22), and the extended tongue root plate (23) is slidably connected in the sliding groove (223).

5. The pile joint with secondary expansion and variable diameter rooting according to claim 1, characterized in that: A fixing component (4) is provided between the shear force tongue root plate (22) and the extended tongue root plate (23), and the fixing component (4) is used to increase the supporting force of the shear force tongue root plate (22) on the extended tongue root plate (23).

6. A secondary expansion variable diameter rooting pile joint according to claim 5, characterized in that: The fixing assembly (4) comprises a fixing block (41) and a fixing groove (42); the fixing block (41) is arranged on the shear force tongue root plate (22); the fixing groove (42) is opened on the extended tongue root plate (23); and the fixing block (41) is located in the fixing groove (42).

7. A pile joint with secondary expansion and variable diameter rooting according to claim 1, characterized in that: The movable hole (211) is provided with a pop-up spring (251), the pop-up spring (251) is provided with a pop-up block (252), the shear force tongue root plate (22) is provided with a pop-up slot (222) for the pop-up block (252) to be inserted, the pop-up spring (251) drives the pop-up block (252) to be inserted into the pop-up slot (222); when the pop-up block (252) is inserted into the pop-up slot (222), the shear force tongue root plate (22) protrudes from the movable hole (211).

8. The pile joint with secondary expansion and variable diameter rooting according to claim 1, characterized in that: The pile joint body (21) is provided with an annular groove (24), a support plate (6) is provided in the annular groove (24), the movable hole (211) is provided on the support plate (6), and a filler is provided in the annular groove (24).

9. A pile joint with secondary expansion and variable diameter rooting according to claim 8, characterized in that: A plurality of frames (61) are arranged in the annular groove (24), and the frames (61) are located between the fillers.

10. A secondary expansion variable diameter rooting pile joint and a pipe pile thereof, comprising the pile joint according to any one of claims 1 to 9, characterized in that: The invention also comprises a pipe pile (1) and a pile joint (2), wherein the pile joint body (21) is arranged on the pipe pile (1), an operating hammer (7) is arranged on the pipe pile (1), an external thread is arranged on the surface of the operating hammer (7), an operating hole (11) is provided on the pipe pile (1) for the operating hammer (7) to pass through, and a groove (221) is provided on the shear force tongue root plate (22) for the external thread to be inserted; when the operating hammer (7) rotates and falls, the shear force tongue root plate (22) protrudes from the pile joint (2) body.

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