Expansion type pile foundation structure for geological defect stratum

Abstract

The invention relates to the technical field of piling equipment, in particular to an expansion type pile foundation structure for a geological defect stratum, which comprises a first pile body and a second pile body which correspond to each other up and down, and an expansion mechanism is arranged between the first pile body and the second pile body; the expansion mechanism comprises a connecting assembly connected between the first pile body and the second pile body, the connecting assembly is provided with a supporting assembly and an unfolding assembly which are correspondingly arranged, and after piling is in place, the unfolding assembly pushes the supporting assembly to be unfolded, so that the supporting assembly extends out of the connecting assembly, and the bearing capacity is increased; the supporting assembly comprises a plurality of unfolding claws which are hinged to the connecting assembly at equal intervals in the circumferential direction, and the unfolding claws are adjustable in angle and arranged in a limiting mode with a limiting assembly arranged on the connecting assembly. The device is simple in structure and convenient to use, the pile foundation bearing capacity in the geological defect stratum is remarkably improved, meanwhile, the device has the comprehensive advantages of being convenient and fast to construct, high in adaptability, high in reliability and the like, and high technical innovation and engineering practical value are achieved.

Description

Technical Field

[0001] This invention relates to the field of piling equipment technology, and in particular to an extended pile foundation structure for geologically defective strata. Background Technology

[0002] Piling is a key process in building foundation engineering. Its core purpose is to drive piles into the ground so that the weight of the building can be transferred to the deeper soil with stronger bearing capacity below the ground, thereby ensuring the structural stability of the building. The essence of this technology is to solve the problem of insufficient strength of the ground soil when it directly bears the pressure of the building, and to achieve foundation reinforcement by optimizing the load transfer path.

[0003] However, traditional pile foundation technology has significant limitations. Its bearing capacity is highly dependent on two core factors: the frictional resistance between the pile surface and the surrounding soil, and the end bearing capacity between the pile tip and the bearing stratum. Both of these factors are limited by the strength of the pile material, the properties of the surrounding soil, and the geological conditions at the pile tip. In actual engineering projects, complex geological environments often lead to the failure of traditional pile foundations. On the one hand, in areas such as soft soil strata and water-bearing sand layers, the low shear strength of the soil and the high pore water pressure significantly reduce the frictional resistance between the pile and the soil, greatly weakening the lateral bearing capacity of the pile foundation. On the other hand, when there are geological defects such as sediment and karst caves in the strata, the pile tip cannot effectively contact the intact bearing stratum, resulting in insufficient end bearing capacity. This can easily lead to safety hazards such as pile foundation settlement and instability, making it difficult to meet the requirements of pile foundation bearing capacity for construction projects in geologically defective strata.

[0004] Therefore, this invention designs an extended pile foundation structure for geologically defective strata to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide an extended pile foundation structure for geologically defective strata to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides an extended pile foundation structure for geologically defective strata, wherein the pile foundation structure is driven into the ground by a pile driving device, and the pile foundation structure includes a first pile body and a second pile body that are corresponding to each other, and an extendable extension mechanism is provided between the first pile body and the second pile body.

[0007] The extension mechanism includes a connecting component connecting the first pile body and the second pile body. The connecting component is provided with a corresponding support component and a unfolding component. After the pile is driven into place, the unfolding component pushes the support component to unfold, so that the support component extends out of the connecting component, thereby increasing the bearing capacity.

[0008] The support component includes several circumferentially equidistantly hinged claws to the connecting component. The angle of the claws is adjustable and they are positioned relative to a limiting component disposed on the connecting component.

[0009] Preferably, the connecting assembly includes a connecting pipe and a guide rod arranged coaxially. The top ends of the connecting pipe and the guide rod are fixedly connected to the bottom end of the first pile body, and the bottom ends of the connecting pipe and the guide rod are fixedly connected to the top end of the second pile body. The connecting pipe has a plurality of circumferentially spaced through slots, which are correspondingly arranged with the unfolding claw. The top end of the unfolding claw is rotatably connected in the through slot.

[0010] Preferably, the support assembly includes a ring slidably connected to the guide rod, and a plurality of rotating plates corresponding to the unfolding claw are hinged to the outer wall of the ring. The side of the rotating plate away from the ring is rotatably connected to the inner wall of the unfolding claw. When the unfolding claw rotates and unfolds, the rotating plate drives the ring to move downward, and after moving into place, it is limited by the limiting assembly.

[0011] Preferably, the unfolding assembly includes a first circular plate and a second circular plate sleeved on the guide rod, the first circular plate and the second circular plate being rotatably connected; a groove corresponding to the unfolding claw is provided on the first circular plate, a top rod that is slidably connected to the second circular plate and is drivenly connected to the groove, the top end of the top rod extending out of the groove and abutting against the unfolding claw.

[0012] Preferably, the second circular plate is provided with a plurality of arc-shaped grooves corresponding to the top rod, and a sliding rod is slidably connected in the arc-shaped groove. The sliding rod extends out of the arc-shaped groove and is fixedly connected to the bottom end of the top rod. When the second circular plate rotates under the drive of the axial magnetic field motor, the sliding rod slides in the arc-shaped groove, pushing the top rod to slide out in the groove, and pushing the unfolding claw to unfold outward.

[0013] Preferably, the limiting component includes a first column disposed on the guide rod, the first column having a plurality of storage slots, a limiting plate rotatably connected to the top of the inner cavity of the storage slot, and a reset module disposed between the bottom of the storage slot and the limiting plate; when the ring moves downward, the ring squeezes the limiting plate and retracts into the storage slot; when the ring passes the limiting plate, the reset module pushes the limiting plate to reset, locking the ring and preventing it from moving upward.

[0014] Preferably, the reset module includes a first main body disposed in the storage slot, the end of the first main body away from the storage slot being slidably connected to the limiting plate, and a first spring being sleeved on the first main body, the two ends of the first spring being fixedly connected to the storage slot and the limiting plate respectively.

[0015] Preferably, the top end of the second pile body is provided with a plurality of sealing components corresponding to the unfolding claw. The sealing components extend out of the top end of the second pile body and slide in a sealed manner with the unfolding claw. When the unfolding claw unfolds, it extends and blocks the through groove.

[0016] Preferably, the sealing component includes a second main body embedded in the second pile body, the top of the second main body having a longitudinally arranged groove, a sealing plate elastically sliding in the groove, the sealing plate extending out of the groove and having an inclined side, the inclined side sealingly sliding with the unfolding claw.

[0017] Preferably, the piling equipment includes a base plate, which is sleeved on the first pile body and slidably connected to the first pile body through an auxiliary component; a support frame is provided at the top of the base plate, and a striking block corresponding to the first pile body is provided on the support frame, and the striking block hammers the first pile body to perform the piling operation.

[0018] Compared with the prior art, the present invention has the following advantages and technical effects: The present invention relates to an extended pile foundation structure for geologically defective strata, which is mainly used to solve the problem that traditional pile foundations mainly rely on the frictional resistance between the pile surface and the soil and the end bearing capacity between the pile end and the bearing layer to transfer the upper load. The bearing capacity is limited by the strength of the pile material, the properties of the surrounding soil and the geological conditions at the pile end. Moreover, under complex geological conditions, the pile-soil frictional resistance is significantly reduced due to the low shear strength of the soil and the high pore water pressure. At the same time, the pile end is prone to insufficient end bearing capacity due to geological defects such as sediment and karst caves. This invention incorporates a support component, a limiting component, and a deploying component. When the pile reaches the appropriate position, the deploying component pushes the deploying claws in the support component to unfold. Once the deploying claws reach their limit position, the limiting component further restricts the support component, improving the stability of the deploying claws at their limit position. The radial expansion of the deploying claws forms a mechanical lock with the soil, significantly increasing the pile foundation's side friction and end bearing area. This is particularly beneficial in soft soil layers or projects with high bearing capacity requirements, significantly improving the overall bearing capacity of the pile foundation. The circumferentially evenly distributed deploying claws, after expansion, ensure a "ring-shaped uniform distribution" of stress on the surrounding soil, preventing pile sidewall cracking or localized soil compaction damage caused by localized stress concentration, and extending the structural durability of the pile foundation. Durability is enhanced, while reducing the risk of pile tilting caused by uneven stress. The deploying claw can flexibly adjust its deployment angle according to the looseness of the stratum and the size of the cracks. Its number can be flexibly set according to the pile diameter and bearing requirements. It can meet the lightweight expansion needs of small-diameter piles and adapt to the high bearing capacity requirements of large-diameter piles. It has good adaptability to different types of geological defects. The expansion mechanism is equipped with a sealing component. The sealing component works in conjunction with the deploying claw to ensure that the deploying claw can still be reliably deployed in complex geological conditions such as water-bearing sand layers and karst development areas. This avoids the bearing capacity failure problem caused by soil collapse and grout leakage in karst caves of traditional piles. At the same time, the sealing component automatically seals the through groove during the pile insertion stage to prevent mud intrusion from affecting the deployment function.

[0019] This invention has a simple structure and is easy to use. It significantly improves the bearing capacity of pile foundations in geologically defective strata. It also has comprehensive advantages such as convenient construction, strong adaptability, and high reliability. It has strong technical innovation and engineering practical value. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0021] Figure 1This is a three-dimensional schematic diagram of the extended pile foundation structure of the present invention for use in geologically defective strata;

[0022] Figure 2 This is a schematic diagram of the internal structure of the first pile body, the connecting pipe, and the second pile body of the present invention.

[0023] Figure 3 For the present invention Figure 2 A magnified view of part A in the image;

[0024] Figure 4 This is a three-dimensional structural diagram of the support component of the present invention;

[0025] Figure 5 This is the explosive intent of the limiting component of the present invention;

[0026] Figure 6 This is the explosive intent of the unfolding components of the present invention;

[0027] Figure 7 This is a schematic diagram of the internal structure of the enclosed component of the present invention;

[0028] Figure 8 This is a schematic diagram of the extended pile foundation structure of the present invention for use in geologically defective strata;

[0029] Figure 9 For the present invention Figure 8 A magnified view of part B in the image;

[0030] Figure 10 This is a schematic diagram of the internal structure of the auxiliary component of the present invention;

[0031] In the diagram: 1. First pile body; 2. Connecting pipe; 3. Through groove; 4. Guide rod; 5. Support assembly; 6. Limiting assembly; 7. Deployment assembly; 8. Second pile body; 9. Closing assembly; 10. Base plate; 11. Positioning groove; 12. Auxiliary assembly; 13. Support plate; 14. Fixing plate; 15. Impact block; 16. Steel cable; 17. Battery; 501. Ring; 502. Deployment claw; 503. Rotation groove; 504. Side plate; 505. Rotation plate; 601. First main body; 602. Storage groove; 603. Limiting plate ; 604, baffle; 605, first guide rod; 606, first spring; 701, first circular plate; 702, second circular plate; 703, groove; 704, top rod; 705, slide rod; 706, arc groove; 707, axial magnetic field motor; 901, second main body; 902, slide groove; 903, closing plate; 904, second guide rod; 905, second spring; 1201, third main body; 1202, moving groove; 1203, round rod; 1204, connecting plate; 1205, third spring; 1206, roller. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Reference Figures 1 to 10 As shown, this embodiment provides an extended pile foundation structure for geologically defective strata. The pile foundation structure is driven into the ground by a pile driving device. The pile foundation structure includes a first pile body 1 and a second pile body 8 that are corresponding to each other. An extendable extension mechanism is provided between the first pile body 1 and the second pile body 8.

[0035] The extension mechanism includes a connecting component connecting the first pile body 1 and the second pile body 8. The connecting component is provided with a corresponding support component 5 and a unfolding component 7. After the pile is driven into place, the unfolding component 7 pushes the support component 5 to unfold, so that the support component 5 extends out of the connecting component and increases the bearing capacity.

[0036] The support component 5 includes several circumferentially equidistantly hinged claws 502 on the connecting component. The claws 502 are adjustable in angle and are positioned relative to the limiting component 6 provided on the connecting component.

[0037] This invention relates to an extended pile foundation structure for geologically defective strata. By incorporating a support component 5, a limiting component 6, and a deploying component 7, when the pile reaches a suitable position, the deploying component 7 pushes the deploying claw 502 in the support component 5 to unfold. After the deploying claw 502 reaches its limit position, the limiting component 6 further limits the support component 5, improving the stability of the deploying claw 502 at its limit position. The radial expansion of the deploying claw 502 forms a mechanical lock with the soil, significantly increasing the side friction resistance and end bearing area of ​​the pile foundation. This is particularly beneficial in soft soil strata or projects with high bearing capacity requirements, significantly improving the overall bearing capacity of the pile foundation. The circumferentially uniformly distributed deploying claw 502, after expansion, ensures a "ring-shaped uniform distribution" of stress on the surrounding strata, avoiding localized stress concentration that could lead to pile sidewall cracking or localized strata damage. The compaction failure mechanism extends the structural durability of the pile foundation and reduces the risk of pile tilting caused by uneven stress. The unfolding claw 502 can flexibly adjust its unfolding angle according to the looseness and crack size of the stratum, and its number can be flexibly set according to the pile diameter and bearing requirements. It can meet the lightweight expansion needs of small-diameter pile foundations and adapt to the high bearing capacity requirements of large-diameter pile foundations, and has good adaptability to different types of geological defect strata. The expansion mechanism is equipped with a sealing component 9, which works in conjunction with the unfolding claw 502 to ensure that the unfolding claw 502 can still reliably unfold in complex geological conditions such as water-bearing sand layers and karst development areas, avoiding the bearing capacity failure problems caused by soil collapse and grout leakage in traditional pile foundations. At the same time, the sealing component 9 automatically seals the through groove 3 during the pile insertion stage to prevent mud intrusion from affecting the unfolding function. This invention has a simple structure, is easy to use, and achieves a significant improvement in the bearing capacity of pile foundations in geological defect strata. It also has comprehensive advantages such as convenient construction, strong adaptability, and high reliability, and has strong technical innovation and engineering practical value.

[0038] The scheme is further optimized. The connecting component includes a coaxially arranged connecting pipe 2 and guide rod 4. The top ends of the connecting pipe 2 and guide rod 4 are fixedly connected to the bottom end of the first pile body 1, and the bottom ends of the connecting pipe 2 and guide rod 4 are fixedly connected to the top end of the second pile body 8. Several circumferentially spaced through grooves 3 are opened on the connecting pipe 2. The through grooves 3 are correspondingly arranged with the unfolding claw 502, and the top end of the unfolding claw 502 is rotatably connected in the through groove 3. The guide rod 4 and connecting pipe 2 of the connecting component connect the first pile body 1 and the second pile body 8, combining the first pile body 1 and the second pile body 8 into a whole, which facilitates pile driving. At the same time, the connecting pipe 2 and guide rod 4 can also provide an installation foundation for the support component 5, the limiting component 6, and the unfolding component 7. During pile driving, the first pile body 1, connecting pipe 2, and second pile body 8 are placed at the bottom. An ultrasonic sensor is installed at the lower end of the second pile body 8. When the ultrasonic sensor detects that the second pile body 8 has reached the appropriate position, the sensor controls the unfolding component 7 to push the unfolding claw 502 inside the support component 5 to rotate, so that the unfolding claw 502 and the outer surface of the second pile body 8 form a certain angle. As the second pile body 8 moves, the length of the unfolding claw 502 entering the soil increases. At the same time, the support component 5 slides downward along the axial direction of the guide rod 4. When the unfolding claw 502 is at a certain angle, the support component 5 passes through the limiting component 6 and limits the unfolding claw 502. At the same time, the limiting component 6 further limits the support component 5, thereby improving the overall bearing capacity. As the unfolding claw 502 goes deeper, the sealing component 9 keeps close to the unfolding claw 502 in real time to prevent soil from entering the connecting pipe 2.

[0039] A further optimized design includes a support component 5 comprising a ring 501 slidably connected to a guide rod 4. The outer wall of the ring 501 is hinged with several rotating plates 505 corresponding to the unfolding claws 502. The side of each rotating plate 505 away from the ring 501 is rotatably connected to the inner wall of the unfolding claws 502. When the unfolding claws 502 rotate and unfold, the rotating plates 505 drive the ring 501 to move downwards, and after reaching its designated position, it is stopped by a limiting component 6. (See appendix) Figure 4 As shown, the outer surface of the ring 501 of the support assembly 5 has several rotating grooves 503 corresponding to the unfolding claws 502. Each unfolding claw 502 has two symmetrically distributed side plates 504 fixed on one side near the ring 501. A rotating plate 505 is disposed between the two side plates 504 and forms a rotatable connection with the side plates 504 and the inner wall of the rotating grooves 503. During the rotation of the unfolding claw 502, the rotating plate 505 pulls the ring 501 to slide downward along the guide rod 4 axis. At the same time, the ring 501 and the rotating plate 505 together limit the rotation angle of the unfolding claw 502 to prevent it from rotating too much, thereby ensuring the stability of the load-bearing capacity.

[0040] Further optimizing the design, the unfolding assembly 7 includes a first circular plate 701 and a second circular plate 702 sleeved on the guide rod 4, with the first circular plate 701 and the second circular plate 702 rotatably connected. The first circular plate 701 has a groove 703 corresponding to the unfolding claw 502, and a push rod 704, which is slidably connected to the second circular plate 702, is slidably connected within the groove 703. The top end of the push rod 704 extends out of the groove 703 and abuts against the unfolding claw 502. The second circular plate 702 has several arc-shaped grooves 706 corresponding to the push rods 704, and sliding rods 705 are slidably connected within the arc-shaped grooves 706. The sliding rods 705 extend out of the arc-shaped grooves 706 and are fixedly connected to the bottom end of the push rods 704. When the second circular plate 702 rotates under the drive of the axial magnetic field motor 707, the sliding rods 705 slide within the arc-shaped grooves 706, pushing the push rods 704 to slide out of the grooves 703, thus pushing the unfolding claw 502 to unfold outwards. (See appendix) Figure 6 As shown, the main body of the unfolding assembly 7 includes a first circular plate 701 and a second circular plate 702 that rotate relative to each other. The first circular plate 701 has several grooves 703 corresponding to the unfolding claw 502 on the side near the second circular plate 702. A push rod 704 is installed inside each groove 703. A sliding rod 705 is fixedly installed on the side of the push rod 704 near the second circular plate 702. Several arc-shaped grooves 706 are formed through the bottom surface of the second circular plate 702 corresponding to the sliding rod 705. The arc-shaped grooves 706 correspond to the grooves 703. An axial magnetic field motor 707 is fixedly installed on the bottom surface of the second circular plate 702, and the axial magnetic field motor 707 is fixedly connected to the guide rod 4. When the unfolding assembly 7 needs to push the unfolding claw 502, the axial magnetic field motor 707 drives the second circular plate 702 to rotate. The second circular plate 702 pushes the sliding rod 705 through the arc-shaped grooves 706, thereby enabling the second circular plate 702 to push the push rod 704 to move, and thus enabling the push rod 704 to push the unfolding claw 502 to rotate.

[0041] In a further optimized design, the limiting component 6 includes a first column 601 mounted on the guide rod 4. The first column 601 has several storage slots 602. A limiting plate 603 is rotatably connected to the top of the inner cavity of each storage slot 602. A reset module is located between the bottom of the storage slot 602 and the limiting plate 603. When the ring 501 moves downwards, it presses against the limiting plate 603 and retracts into the storage slot 602. When the ring 501 passes the limiting plate 603, the reset module pushes the limiting plate 603 to reset, preventing the ring 501 from moving upwards. In a further optimized design, the reset module includes a first body 4 mounted in the storage slot 602. The end of the first body 4 furthest from the storage slot 602 is slidably connected to the limiting plate 603. A first spring 606 is sleeved on the first body 4, and both ends of the first spring 606 are fixedly connected to the storage slot 602 and the limiting plate 603, respectively. (See appendix) Figure 5As shown, the first main body 601 of the limiting component 6 is embedded in the guide rod 4, and its outer surface has several circumferentially distributed storage slots 602. Each storage slot 602 has a limiting plate 603 rotatably installed inside it, and a baffle 604 is provided in the slot. At the same time, a first guide rod 605 with a first spring 606 is fixedly installed, and the two ends of the spring are connected to the slot wall and the limiting plate 603 respectively. When the ring 501 of the support component 5 passes through, it will be squeezed along the edge of the limiting plate 603 to make it rotate, causing the first spring 606 to deform and store force. After the ring 501 has completely passed through, the first spring 606 pushes the limiting plate 603 to quickly reset. At this time, the baffle 604 limits its reset range, ensuring that the limiting plate 603 is accurately positioned and realizing the limiting function of the support component 5.

[0042] A further optimized design includes several closing components 9 at the top of the second pile body 8, corresponding to the unfolding claws 502. These closing components 9 extend from the top of the second pile body 8 and slide in a sealed manner with the unfolding claws 502. When the unfolding claws 502 unfold, they extend and block the through groove 3. In a further optimized design, the closing component 9 includes a second main body 901 embedded within the second pile body 8. The top of the second main body 901 has a longitudinally arranged sliding groove 902. A closing plate 903 slides elastically within the sliding groove 902. The closing plate 903 extends out of the sliding groove 902 and has a beveled edge, which slides in a sealed manner with the unfolding claws 502. (See appendix.) Figure 7 As shown, several second bodies 901 of the sealing component 9 are embedded at the top of the second column 8, and a sliding groove 902 is opened inside the groove, with a sealing plate 903 installed inside the groove. Two symmetrically distributed second guide rods 904 are fixed at the bottom of the sliding groove 902 corresponding to the sealing plate 903. A second spring 905 is sleeved on the outside of each guide rod, and the two ends of the spring are connected to the groove wall and the sealing plate 903 respectively. During the rotation of the unfolding claw 502, the second spring 905 always pushes the sealing plate 903 to keep it in contact with the unfolding claw 502, thereby preventing soil from entering the connecting pipe 2 through the through groove 3, ensuring smooth operation of the entire device.

[0043] A further optimized scheme includes a pile driving device comprising a base plate 10, which is fitted over the first pile body 1 and slidably connected to the first pile body 1 via an auxiliary component 12. A support frame is mounted on the top of the base plate 10, and a striking block 15, corresponding to the first pile body 1, is mounted on the support frame. The striking block 15 hammers the first pile body 1 to perform the pile driving operation. (See appendix) Figure 8-9As shown, a base plate 10 is provided on the outer side of the first pile body 1. A positioning groove 11 corresponding to the first pile body 1 is opened at the center of the base plate 10. Several auxiliary components 12 corresponding to the positioning groove 11 are fixedly installed inside the base plate 10. The auxiliary components 12 are circumferentially distributed about the center line of the positioning groove 11. Several support plates 13 are fixedly installed on the upper surface of the base plate 10. The support plates 13 are symmetrically distributed about the center line of the base plate 10. A fixing plate 14 is provided between two corresponding support plates 13 on the left and right sides of the base plate 10. A striking block 15 is provided above the first pile body 1. Several steel cables 1 are fixedly installed on the upper surface of the striking block 15. 6. Several steel cables 16 are symmetrically distributed about the center line of the impact block 15. The steel cables 16 are slidably connected to the fixing plate 14. The first pile body 1, the connecting pipe 2 and the second pile body 8 all pass through the positioning groove 11, and the axis of the first pile body 1 is collinear with the axis of the positioning groove 11. By pulling the steel cables 16, the impact block 15 rises along the axis of the positioning groove 11. Then, the steel cables 16 are released and the impact block 15 impacts the upper end of the first pile body 1 under the action of gravity, so that the first pile body 1, the connecting pipe 2 and the second pile body 8 enter the soil. During the impact, several auxiliary components 12 push the corresponding position of the pile body in real time to prevent the pile body from deviating during the impact.

[0044] In one embodiment of the present invention, see Appendix Figure 10 As shown, the auxiliary component 12 includes a third body 1201. The third body 1201 has a moving groove 1202 inside. A round rod 1203 is provided inside the moving groove 1202. A connecting plate 1204 corresponding to the moving groove 1202 is sleeved on the outer surface of the round rod 1203. A third spring 1205 is sleeved on the outer surface of the round rod 1203. The two ends of the third spring 1205 are fixedly connected to the connecting plate 1204 and the inner wall of the moving groove 1202, respectively. A roller 1206 is rotatably installed at the end of the round rod 1203 away from the third spring 1205. The third spring 1205 pushes the connecting plate 1204 in real time. The connecting plate 1204 pushes the roller 1206 to abut against the pile body in real time through the round rod 1203.

[0045] In one embodiment of the present invention, see Appendix Figure 3 As shown, the unfolding claw 502 and the through groove 3 adopt an interference fit with a tolerance of 1mm-2mm. During the pile penetration process, the unfolding claw 502 needs to retract into the through groove 3 of the connecting pipe 2. The interference fit makes the unfolding claw 502 and the wall of the through groove 3 fit tightly through mechanical extrusion, which ensures the overall friction of the pile body and prevents the unfolding claw 502 from rotating before reaching the corresponding position.

[0046] In one embodiment of the present invention, a battery 17 is provided inside the connecting pipe 2 corresponding to the second pile body 8, and the battery 17 is electrically connected to the axial magnetic field motor 707. The battery 17 provides an independent power supply for the axial magnetic field motor 707. When the battery 17 receives a signal from the ultrasonic sensor, the battery 17 transmits power to the axial magnetic field motor 707, so that the opening and retraction action of the unfolding claw 502 does not need to rely on the external power grid or cable, which significantly improves the applicability and flexibility of the device.

[0047] In one embodiment of the present invention, the battery 17 is preferably a CATL LFP-3.2V-280Ah.

[0048] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0049] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An extended pile foundation structure for geologically defective strata, wherein the pile foundation structure is driven into the ground by a pile driving device, characterized in that: The pile foundation structure includes a first pile body (1) and a second pile body (8) that are corresponding to each other, and an expandable extension mechanism is provided between the first pile body (1) and the second pile body (8). The extension mechanism includes a connecting component connecting the first pile body (1) and the second pile body (8). The connecting component is provided with a corresponding support component (5) and a unfolding component (7). After the pile is driven into place, the unfolding component (7) pushes the support component (5) to unfold, so that the support component (5) extends out of the connecting component, thereby increasing the bearing capacity. The support component (5) includes several circumferentially equidistantly hinged claws (502) on the connecting component. The claws (502) are adjustable in angle and are limited by a limiting component (6) provided on the connecting component.

2. The extended pile foundation structure for geologically defective strata according to claim 1, characterized in that: The connecting assembly includes a connecting pipe (2) and a guide rod (4) arranged coaxially. The top ends of the connecting pipe (2) and the guide rod (4) are fixedly connected to the bottom end of the first pile body (1), and the bottom ends of the connecting pipe (2) and the guide rod (4) are fixedly connected to the top end of the second pile body (8). The connecting pipe (2) is provided with a plurality of through slots (11) arranged circumferentially at equal intervals. The through slots (11) are correspondingly arranged with the unfolding claw (502), and the top end of the unfolding claw (502) is rotatably connected in the through slot (11).

3. The extended pile foundation structure for geologically defective strata according to claim 2, characterized in that: The support assembly (5) includes a ring (501) slidably connected to the guide rod (4). The outer wall of the ring (501) is hinged with a plurality of rotating plates (505) corresponding to the unfolding claw (502). The side of the rotating plate (505) away from the ring (501) is rotatably connected to the inner wall of the unfolding claw (502). When the unfolding claw (502) rotates and unfolds, the rotating plate (505) drives the ring (501) to move downward. After moving into place, it is limited by the limiting assembly (6).

4. The extended pile foundation structure for geologically defective strata according to claim 2, characterized in that: The unfolding assembly (7) includes a first circular plate (701) and a second circular plate (702) sleeved on the guide rod (4), and the first circular plate (701) and the second circular plate (702) are rotatably connected; The first circular plate (701) has a groove (703) corresponding to the unfolding claw (502). A push rod (704) that is slidably connected to the second circular plate (702) is slidably connected in the groove (703). The top end of the push rod (704) extends out of the groove (703) and abuts against the unfolding claw (502).

5. The extended pile foundation structure for geologically defective strata according to claim 4, characterized in that: The second circular plate (702) is provided with a plurality of arc-shaped grooves (706) corresponding to the top rod (704). A sliding rod (705) is slidably connected in the arc-shaped groove (706). The sliding rod (705) extends out of the arc-shaped groove (706) and is fixedly connected to the bottom end of the top rod (704). When the second circular plate (702) rotates under the drive of the axial magnetic field motor (707), the sliding rod (705) slides in the arc-shaped groove (706), pushing the top rod (704) to slide out in the groove (703), pushing the unfolding claw (502) to unfold outward.

6. The extended pile foundation structure for geologically defective strata according to claim 3, characterized in that: The limiting component (6) includes a first column disposed on the guide rod (4), the first column having a plurality of storage slots (602) thereon, the top of the inner cavity of the storage slot (602) being rotatably connected to a limiting plate (603), and a reset module being disposed between the bottom of the storage slot (602) and the limiting plate (603); when the ring (501) moves down, the ring (501) squeezes the limiting plate (603) and retracts into the storage slot (602); when the ring (501) passes the limiting plate (603), the reset module pushes the limiting plate (603) to reset, locking the ring (501) so that it cannot move up.

7. The extended pile foundation structure for geologically defective strata according to claim 6, characterized in that: The reset module includes a first body (601) disposed in the storage slot (602). The end of the first body (601) away from the storage slot (602) is slidably connected to the limiting plate (603). The first body (4) is covered with a first spring (606). The two ends of the first spring (606) are fixedly connected to the storage slot (602) and the limiting plate (603) respectively.

8. The extended pile foundation structure for geologically defective strata according to claim 2, characterized in that: The top of the second pile body (8) is provided with a plurality of closing components (9) corresponding to the unfolding claw (502). The closing components (9) extend out of the top of the second pile body (8) and slide in a sealed manner with the unfolding claw (502). When the unfolding claw (502) unfolds, it extends and blocks the through groove (11).

9. The extended pile foundation structure for geologically defective strata according to claim 8, characterized in that: The closing component (9) includes a second main body (901) embedded in the second pile body (8). The top of the second main body (901) is provided with a longitudinally arranged groove (902). A closing plate (903) is elastically slidable in the groove (902). The closing plate (903) extends out of the groove (902) and is provided with a bevel. The bevel slides in a sealed manner with the unfolding claw (502).

10. The extended pile foundation structure for geologically defective strata according to claim 1, characterized in that: The piling equipment includes a base plate (10), which is sleeved on the first pile body (1) and slidably connected to the first pile body (1) through an auxiliary component (12); a support frame is provided at the top of the base plate (10), and a striking block (15) corresponding to the first pile body (1) is provided on the support frame, and the striking block (15) hammers the first pile body (1) to perform piling operation.

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