Bionic root system type variable cross-section drainage composite pile structure

Abstract

The invention discloses a bionic root system type variable cross-section drainage composite pile structure, and belongs to the technical field of drainage composite piles. The bionic composite drainage pile comprises a variable cross-section pile body, a bionic composite drainage structure, a reinforcing structure and a connecting structure, the variable cross-section pile body comprises a plurality of sets of cylindrical sections with the same diameter, and the cylindrical sections are connected with the other set of cylindrical sections or pile tips through the connecting structure; the bionic composite drainage structure comprises a pile core, the pile core is provided with a longitudinal drainage main pipe and a transverse drainage branch pipe penetrating through the pile core in the radial direction along the axis, and the pile core is movably connected to the interior of the variable-section pile body. The reinforcing structure comprises a prestressed tendon arranged in the variable-section pile body and reinforcing ribs arranged on the outer wall of the variable-section pile body. The connecting structure comprises a transition sleeve, and a plurality of grooves are formed in the top and the bottom of the outer wall of the transition sleeve respectively. The method not only can flexibly adapt to complex geological conditions, but also ensures the construction convenience and the overall structural stability.

Description

Technical Field

[0001] The present invention relates to the technical field of drainage composite piles, in particular to a bionic root type variable-cross-section drainage composite pile structure. Background Art

[0002] In projects such as landslide control and foundation pit support, groundwater pressure is a key factor leading to instability. Drainage composite piles are needed for drainage treatment to ensure the consolidation of soft soil and improve its bearing capacity.

[0003] The defects of existing drainage composite piles are:

[0004] 1. Patent document CN207469232U discloses a precast concrete drainage pile, comprising a precast reinforced concrete pipe in a stepped shape, a precast permeable concrete pipe provided inside the precast reinforced concrete pipe, and a drainage channel provided inside the precast permeable concrete pipe; a plurality of permeable units are provided circumferentially on the precast reinforced concrete pipe, the permeable units comprising vertical holes, the vertical holes being connected to a plurality of transverse holes provided on the precast reinforced concrete pipe, and the vertical holes being connected to the precast permeable concrete pipe; abutments are slidably connected in the vertical holes, a water-absorbing ball is slidably connected in the transverse holes, the water-absorbing ball is connected to an elastic member, and the end of the elastic member away from the water-absorbing ball is connected to the abutment. This solution increases the lateral resistance of the drainage pile by increasing the contact area between the drainage pile and the soil layer, thereby improving the stability of the drainage pile, and the coordination of the transverse holes, vertical holes and precast permeable concrete pipes allows pore water to be discharged smoothly, thereby improving the drainage effect of the drainage pile. However, existing drainage piles have technical problems of low drainage efficiency and inability to adapt to complex geology.

[0005] 2. Patent document CN214530623U discloses a precast concrete drainage pile, which includes an outer cylinder, a fixed drill rod and a reinforcement plate. The upper and lower sides of the outer cylinder are both embedded in the chuck, and the internal rotation of the chuck is connected to an intermediate rotating shaft. The fixed drill rod is rotatably installed at the lower end of the outer cylinder, and longitudinal sliding rods are symmetrically installed on both sides of the inner cylinder. Drainage holes are provided on the sides of the inner cylinder and the outer cylinder, and a positioning plate is fixedly installed on the inner side of the inner cylinder, and the inner side of the inner cylinder is interconnected with a hollow cylindrical ring through a transverse sliding rod. The reinforcement plate is installed on the outside of the transverse sliding rod, and the lower end of the reinforcement plate is interconnected with the longitudinal sliding rod through a support rod. This solution adopts a new structural design, which allows the device to pre-fix the installation position of the drainage pile, improve the stability of the drainage pile installation structure, and a reinforcement structure is provided in the device to improve the anti-extrusion performance of the drainage pile during installation and use. However, the existing drainage piles have the technical problems of lack of barrier to sediment intrusion and low drainage efficiency.

[0006] 3. Patent document CN1053479C discloses a rigid drainage pile with a cone at the lower end, a main drainage pipe within the pile, and a pumping pipe connected to the upper end of the main drainage pipe. The main drainage pipe is filled with permeable concrete near the cone tip. A groove is formed in the upper middle portion of the vertical outer surface of the pile, a water pipe is connected to the groove and the main drainage pipe, and a drainage board is installed in the groove. This solution has a simple structure, high pile structural strength, saves pile materials and construction investment, and has fast pile sinking, high bearing capacity, and low settlement. However, existing drainage piles have the technical problem of not being able to synchronize data remotely and provide remote early warning. Summary of the Invention

[0007] The purpose of the present invention is to provide a bionic root-type variable-section drainage composite pile structure. By using highly permeable concrete materials for the variable-section pile body, the leakage coefficient is improved by three orders of magnitude compared with traditional piles. Combined with the internal longitudinal drainage main pipe and the transverse drainage branch pipe, efficient drainage and dynamic adjustment of groundwater pressure are achieved, which can quickly drain pore water and inhibit foundation settlement. The prestressed steel bundles and external reinforcement bars in the reinforced structure form a three-dimensional reinforcement system, which greatly improves the compressive, tensile and shear resistance of the pile body. The modularly designed cylindrical segments are tightly spliced through a connection structure with a limiting component, which can flexibly adapt to complex geological conditions and ensure construction convenience and overall structural stability, so as to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a bionic root-type variable-section drainage composite pile structure, comprising a variable-section pile body, a bionic composite drainage structure, a reinforcement structure and a connection structure, wherein the variable-section pile body comprises several groups of cylindrical segments with the same diameter, and the cylindrical segments are respectively connected to another group of cylindrical segments or pile tips through connection structures; the bionic composite drainage structure comprises a pile core, and the pile core is provided with a longitudinal drainage main pipe along the axis and a transverse drainage branch pipe radially penetrating the pile core, and the pile core is movably connected to the interior of the variable-section pile body; the reinforcement structure comprises a prestressed steel bar bundle arranged inside the variable-section pile body and a reinforcement rib arranged on the outer wall of the variable-section pile body; the connection structure comprises a transition sleeve, and the top and bottom of the outer wall of the transition sleeve are respectively provided with several grooves, and the inner wall of the groove is provided with a restriction component, and the restriction component is used to restrict and fix the cylindrical segments or pile tips; the variable-section pile body is made of high-permeability concrete material.

[0009] Preferably, the limiting component includes a through groove, and the through groove is opened on the inner wall of the groove, and a sliding groove is opened on the inner wall of the through groove. The inner wall of the sliding groove is movably connected with a slider, and a fixing rod is installed through one side of the slider, and the two ends of the fixing rod are fixedly connected to the two ends of the inner wall of the sliding groove, and the outer wall of the fixing rod is movably connected with a pressure spring, and one end of the pressure spring is installed on the other end of the slider.

[0010] Preferably, a limiting block is installed at one end of the slider, and the outer wall of the limiting block is movably connected to the inner wall of the through groove, a pull ring is installed at one end of the limiting block, and the other end of the outer wall of the limiting block is movably connected to the inner wall of the limiting groove, and the limiting grooves are respectively opened at both ends of the outer wall of the cylindrical segment, or one end of the outer wall of the pile tip.

[0011] Preferably, the outer wall of the cylindrical segment is provided with a plurality of first through holes, and a first protective filter is provided on one end of the inner wall of the first through hole close to the outer side, the inner wall of the cylindrical segment is provided with a track, and the inner wall of the track is provided at the other end of the first through hole, and the inner wall of the track is installed with a plurality of first rubber sealing rings, and the plurality of first rubber sealing rings are respectively provided on the outer side of the other end of the first through hole.

[0012] Preferably, a plurality of fixing bars are installed on the outer wall of the pile core, and the outer wall of the fixing bar is movably connected to the inner wall of the track, a plurality of water inlets are provided on one side of the fixing bar, and the water inlets are respectively connected to one end of the horizontal drainage branch pipe, a plurality of second rubber sealing rings are provided on one side of the fixing bar, and the plurality of second rubber sealing rings are respectively provided on the outside of one end of the water inlet, and the plurality of second rubber sealing rings correspond one-to-one to the plurality of first rubber sealing rings.

[0013] Preferably, a base is installed at the bottom of the pile core, a rubber pad is installed on the outer wall of the base, and the outer wall of the rubber pad is movably connected to the inner wall of the cylindrical segment; a plurality of water storage chambers are provided on the top of the base, and one end of the water storage chamber is connected to the bottom of the longitudinal drainage main pipe.

[0014] Preferably, the outer wall of the cylindrical segment is fixedly connected with several semicircular blocks, the outer wall of the cylindrical segment is provided with several second through holes, and the several second through holes are respectively arranged under the several semicircular blocks, and a second protective filter is provided at one end of the second through hole close to the outer side.

[0015] Preferably, the first protective filter screen and the second protective filter screen are made of stainless steel and coated with a PTFE hydrophobic coating on their surfaces to reduce the probability of clay adsorption and avoid clogging of the holes with sediment.

[0016] Preferably, a pile cap is provided on the top of the variable-section pile body, a display screen is embedded in the top of the pile cap, and a microprocessor is embedded inside the pile cap; the microprocessor is electrically connected to a flow sensor, a stress monitoring sensor, a BIM parametric modeling module and an Internet of Things communication module, and the flow sensor is respectively arranged inside the longitudinal drainage main pipe and the transverse drainage branch pipe, and the stress monitoring sensor is embedded in the inner wall of the cylindrical segment, the BIM parametric modeling module is used to construct a parametric three-dimensional model of the pile structure, and simulate the mechanical response and drainage efficiency of the pile body under different geological conditions and load states in real time, and the Internet of Things communication module is used to send the collected data to the cloud or local control center.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This invention utilizes highly permeable concrete materials for its variable-section piles, resulting in a three-order-of-magnitude improvement in the leakage coefficient compared to traditional piles. Combined with internal longitudinal drainage pipes and transverse drainage branches, this achieves efficient drainage and dynamic regulation of groundwater pressure, rapidly channeling pore water and suppressing foundation settlement. The prestressed steel tendons and external reinforcements in the reinforced structure form a three-dimensional reinforcement system, significantly enhancing the pile's compressive, tensile, and shear resistance. The modular cylindrical segments are tightly connected via a connection structure with restraining components, enabling flexible adaptation to complex geological conditions while ensuring ease of construction and overall structural stability.

[0019] 2. This invention significantly optimizes drainage performance and structural sealing through the coordinated design of the cylindrical segments and the pile core. The semicircular blocks on the outer wall of the cylindrical segments, combined with the second through-hole and the second protective filter, enhance pile-soil friction while achieving multi-stage filtration and drainage, effectively blocking sediment intrusion. The sliding connection between the inner wall track and the fixing bar, combined with the tight fit of the first and second rubber sealing rings, forms a dynamic sealing interface, ensuring flexible assembly and disassembly of the pile core while ensuring the fluidity of water entering the horizontal drainage branch pipe. The combined design of the base and rubber pad further strengthens the bottom seal, ensuring efficient communication between the water storage chamber and the longitudinal drainage main pipe, and achieving directional collection and rapid discharge of groundwater.

[0020] 3. The present invention realizes real-time digital control of drainage efficiency and structural health through the intelligent monitoring system integrated into the pile cap. The embedded display screen intuitively presents the drainage data collected by the flow sensor and the stress status of the pile body fed back by the stress monitoring sensor. Combined with the BIM parametric modeling module, it dynamically simulates the mechanical response and drainage path of the pile foundation under different working conditions, providing a visual decision-making basis for engineering optimization. The Internet of Things communication module synchronizes multi-dimensional monitoring data to the cloud platform, supports remote early warning and big data analysis, and forms a "monitoring-assessment-control" closed-loop management. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0023] Figure 3 For the present invention Figure 2 A in the middle is an enlarged structural diagram;

[0024] Figure 4 This is a schematic diagram of the overall top plan structure of the present invention;

[0025] Figure 5 For the present invention Figure 4 The enlarged structural diagram at B in the middle;

[0026] Figure 6 This is a schematic diagram of the three-dimensional structure of the pile core of the present invention;

[0027] Figure 7 This is a schematic diagram of the three-dimensional structure of the base of the present invention;

[0028] Figure 8 Schematic diagram of the microprocessor system architecture of the present invention.

[0029] Figure: 1, variable-section pile; 4, connection structure; 5, cylindrical segment; 6, pile tip; 7, pile core; 8, longitudinal drainage main pipe; 9, transverse drainage branch pipe; 11, prestressed steel tendon; 12, reinforcing rib; 13, transition sleeve; 14, groove; 15, through groove; 16, slide; 17, slider; 18, fixing rod; 19, pressure spring; 20, limiting block; 21, pull ring; 22, limiting groove; 24, first through hole; 25, first protective filter ; 26. Track; 27. First rubber sealing ring; 28. Fixing bar; 29. Water inlet; 30. Second rubber sealing ring; 31. Base; 32. Rubber pad; 34. Water storage chamber; 35. Semicircular block; 36. Second through hole; 37. Second protective filter; 38. Pile cap; 39. Display screen; 40. Microprocessor; 41. Flow sensor; 42. Stress monitoring sensor; 43. BIM parametric modeling module; 44. Internet of Things communication module. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] See also Figure 1-8, this embodiment provides a technical solution: a bionic root type variable cross-section drainage composite pile structure, including a variable cross-section pile body 1, a bionic composite drainage structure, a reinforcement structure and a connection structure 4, the variable cross-section pile body 1 includes several groups of cylindrical segments 5 with the same diameter, and the cylindrical segments 5 are respectively connected to another group of cylindrical segments 5 or pile tips 6 through the connection structure 4; the bionic composite drainage structure includes a pile core 7, the pile core 7 is provided with a longitudinal drainage main pipe 8 along the axis and a transverse drainage branch pipe 9 radially penetrating the pile core 7, and the pile core 7 is movably connected to the interior of the variable cross-section pile body 1; the reinforcement structure includes a prestressed steel bar bundle 11 arranged inside the variable cross-section pile body 1 and a reinforcement rib 12 arranged on the outer wall of the variable cross-section pile body 1; the connection structure 4 includes a transition sleeve 13, and a plurality of grooves 14 are respectively opened on the top and bottom of the outer wall of the transition sleeve 13, and a restriction component is opened on the inner wall of the groove 14, which is used to restrict and fix the cylindrical segments 5 or the pile tip 6; the variable cross-section pile body 1 is made of high-permeability concrete material.

[0032] By using highly permeable concrete material for the variable-section pile body 1, the leakage coefficient is improved by three orders of magnitude compared to traditional piles. Combined with the internal longitudinal drainage main pipe 8 and the transverse drainage branch pipe 9, efficient drainage and dynamic regulation of groundwater pressure are achieved, which can quickly drain pore water and inhibit foundation settlement. The prestressed steel bundles 11 and the external reinforcement bars 12 in the reinforced structure form a three-dimensional reinforcement system, which greatly improves the compressive, tensile and shear resistance of the pile body. The modularly designed cylindrical segments 5 are tightly spliced through a connection structure 4 with a restraining component, which can flexibly adapt to complex geological conditions while ensuring construction convenience and overall structural stability. In addition, the variable-section shape of the bionic root system enhances the pile-soil synergy, so that the structure has both efficient drainage, long-term load-bearing and environmental adaptability in soft foundation treatment and slope reinforcement scenarios.

[0033] The limiting assembly includes a through slot 15, and the through slot 15 is opened on the inner wall of the groove 14. A slide slot 16 is opened on the inner wall of the through slot 15. A slider 17 is movably connected to the inner wall of the slide slot 16, and a fixing rod 18 is installed through one side of the slider 17, and both ends of the fixing rod 18 are fixedly connected to the two ends of the inner wall of the slide slot 16. The outer wall of the fixing rod 18 is movably connected to a pressure spring 19, and one end of the pressure spring 19 is installed on the other end of the slider 17; a limiting block 20 is installed at one end of the slider 17, and the outer wall of the limiting block 20 is movably connected to the inner wall of the through slot 15, a pull ring 21 is installed at one end of the limiting block 20, and the other end of the outer wall of the limiting block 20 is movably connected to the inner wall of the limiting slot 22, and the limiting slots 22 are respectively opened at both ends of the outer wall of the cylindrical segment 5, or one end of the outer wall of the pile tip 6.

[0034] Through the linkage design of the through groove 15, the slide groove 16, the slider 17, the fixing rod 18 and the pressure spring 19, the rapid locking and adaptive adjustment functions of the connection structure 4 are realized. When the cylindrical segment 5 or the pile tip 6 is inserted into the groove 14 of the transition sleeve 13, the limiting block 20 is pushed by the pressure spring 19 to automatically embed into the limiting groove 22, forming a rigid lock to ensure the stability of the splicing. The limiting block 20 can be manually retracted through the pull ring 21 to release the constraint, simplifying the disassembly and assembly process. This design combines the dual mechanisms of elastic preload and mechanical limit, which can not only adapt to the slight deformation deviation during the splicing of the pile body, but also effectively disperse the load stress, avoid stress concentration at the connection, and significantly improve the pull-out resistance, torsional resistance and seismic toughness of the overall structure. In addition, the modular assembly method greatly reduces the construction complexity and shortens the construction period. It is suitable for the efficient construction and later maintenance of pile foundations under complex geological conditions.

[0035] A plurality of first through holes 24 are provided on the outer wall of the cylindrical segment 5, and a first protective filter screen 25 is provided on the inner wall of the first through hole 24 near the outer end. A track 26 is provided on the inner wall of the cylindrical segment 5, and the inner wall of the track 26 is provided at the other end of the first through hole 24. A plurality of first rubber sealing rings 27 are installed on the inner wall of the track 26, and the plurality of first rubber sealing rings 27 are respectively provided on the outer side of the other end of the first through hole 24; a plurality of fixing bars 28 are installed on the outer wall of the pile core 7, and the outer wall of the fixing bar 28 is movably connected to the inner wall of the track 26, a plurality of water inlets 29 are provided on one side of the fixing bar 28, and the water inlets 29 are respectively connected to one end of the horizontal drainage branch pipe 9, a plurality of second rubber sealing rings 30 are provided on one side of the fixing bar 28, and the plurality of second rubber sealing rings 30 are respectively provided on the outer side of one end of the water inlet 29, and the plurality of second rubber sealing rings 30 correspond one-to-one to the plurality of first rubber sealing rings 27.

[0036] By setting the fixing strip 28 and the track 26, the water inlet 29 and the first through hole 24 can form a dynamic seal through the first rubber sealing ring 27 and the second rubber sealing ring 30, which is beneficial to avoiding soil intrusion under normal conditions. According to the setting of the fixing strip 28 and the water inlet 29, when installing the pile core 7, a one-way valve can be added to the water inlet 29 according to the soil state to further avoid soil intrusion. The detachable setting of the pile core 7 is beneficial to cleaning the location where the hole is blocked or the soil is intruded.

[0037] A base 31 is installed at the bottom of the pile core 7, and a rubber pad 32 is installed on the outer wall of the base 31, and the outer wall of the rubber pad 32 is movably connected to the inner wall of the cylindrical segment 5; a plurality of water storage chambers 34 are provided on the top of the base 31, and one end of the water storage chamber 34 is connected to the bottom of the longitudinal drainage main pipe 8; a plurality of semicircular blocks 35 are fixedly connected to the outer wall of the cylindrical segment 5, and a plurality of second through holes 36 are opened on the outer wall of the cylindrical segment 5, and the plurality of second through holes 36 are respectively arranged below the plurality of semicircular blocks 35, and a second protective filter 37 is provided at one end of the second through hole 36 close to the outer side.

[0038] The coordinated design of the cylindrical segment 5 and the pile core 7 significantly optimizes drainage performance and structural sealing. The semicircular block 35 on the outer wall of the cylindrical segment 5 and the second through hole 36 are combined with the second protective filter 37 to enhance the pile-soil friction while achieving multi-stage filtration and drainage, effectively blocking the intrusion of sediment. The sliding connection between the inner wall track 26 and the fixing bar 28, combined with the tight fit of the first rubber sealing ring 27 and the second rubber sealing ring 30, forms a dynamic sealing interface, which not only ensures the flexible assembly and disassembly of the pile core 7, but also ensures the fluidity of water entering the horizontal drainage branch pipe 9. The combined design of the base 31 and the rubber pad 32 further strengthens the bottom seal, ensuring efficient communication between the water storage chamber 34 and the longitudinal drainage main pipe 8, and realizing the directional collection and rapid discharge of groundwater. In addition, the modular semicircular block 35 and the through hole distribution enhance the pile's anti-lateral displacement ability and drainage path redundancy, enabling it to combine efficient drainage, adaptive sealing and long-term stability in soft soil and high water level complex geology, significantly improving project safety and environmental adaptability.

[0039] A pile cap 38 is provided on the top of the variable-section pile body 1, and a display screen 39 is embedded in the top of the pile cap 38, and a microprocessor 40 is embedded inside the pile cap 38; the microprocessor 40 is electrically connected to a flow sensor 41, a stress monitoring sensor 42, a BIM parametric modeling module 43 and an Internet of Things communication module 44, and the flow sensor 41 is respectively arranged inside the longitudinal drainage main pipe 8 and the transverse drainage branch pipe 9, and the stress monitoring sensor 42 is embedded in the inner wall of the cylindrical segment 5, the BIM parametric modeling module 43 is used to construct a parametric three-dimensional model of the pile structure, and simulate the mechanical response and drainage efficiency of the pile body under different geological conditions and load states in real time, and the Internet of Things communication module 44 is used to send the collected data to the cloud or local control center.

[0040] Through the intelligent monitoring system integrated into the pile cap 38, real-time digital control of drainage efficiency and structural health is achieved. The embedded display screen 39 intuitively presents the drainage data collected by the flow sensor 41 and the stress status of the pile body fed back by the stress monitoring sensor 42. Combined with the BIM parametric modeling module 43, the mechanical response and drainage path of the pile foundation under different working conditions are dynamically simulated, providing a visual decision-making basis for engineering optimization. The Internet of Things communication module 44 synchronizes multi-dimensional monitoring data to the cloud platform, supports remote early warning and big data analysis, and forms a "monitoring-assessment-control" closed-loop management. Through flow anomaly identification, stress overlimit early warning and geological adaptability simulation, the system can actively prevent siltation and structural damage risks, extend the life of the pile body, and at the same time improve construction accuracy and operation and maintenance efficiency, and promote the development of pile foundation engineering towards intelligence and adaptability.

[0041] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A bionic root-type variable-section drainage composite pile structure, characterized by: It includes a variable-section pile body, a bionic composite drainage structure, a reinforcement structure and a connection structure. The variable-section pile body includes several groups of cylindrical segments with the same diameter, and the cylindrical segments are connected to another group of cylindrical segments or pile tips through connection structures; the bionic composite drainage structure includes a pile core, and the pile core is provided with a longitudinal drainage main pipe along the axis and a transverse drainage branch pipe radially penetrating the pile core, and the pile core is movably connected to the interior of the variable-section pile body; the reinforcement structure includes a prestressed steel bar bundle arranged inside the variable-section pile body and a reinforcement rib arranged on the outer wall of the variable-section pile body; the connection structure includes a transition sleeve, and the top and bottom of the outer wall of the transition sleeve are respectively provided with several grooves, and the inner wall of the groove is provided with a limiting component, and the limiting component is used to limit and fix the cylindrical segments or pile tips; the variable-section pile body is made of high-permeability concrete material.

2. The bionic root-type variable-section drainage composite pile structure according to claim 1, characterized in that: The limiting component includes a through slot, and the through slot is opened on the inner wall of the groove, a sliding slot is opened on the inner wall of the through slot, a slider is movably connected to the inner wall of the sliding slot, and a fixing rod is installed through one side of the slider, and the two ends of the fixing rod are fixedly connected to the two ends of the inner wall of the sliding slot, the outer wall of the fixing rod is movably connected to a pressure spring, and one end of the pressure spring is installed on the other end of the slider.

3. The bionic root-type variable-section drainage composite pile structure according to claim 1, characterized in that: A limiting block is installed at one end of the slider, and the outer wall of the limiting block is movably connected to the inner wall of the through groove. A pull ring is installed at one end of the limiting block, and the other end of the outer wall of the limiting block is movably connected to the inner wall of the limiting groove. The limiting grooves are respectively opened at both ends of the outer wall of the cylindrical segment or one end of the outer wall of the pile tip.

4. The bionic root-type variable-section drainage composite pile structure according to claim 1, characterized in that: The outer wall of the cylindrical segment is provided with a plurality of first through holes, and a first protective filter is provided on one end of the inner wall of the first through hole close to the outer side, the inner wall of the cylindrical segment is provided with a track, and the inner wall of the track is provided at the other end of the first through hole, and the inner wall of the track is installed with a plurality of first rubber sealing rings, and the plurality of first rubber sealing rings are respectively provided on the outer side of the other end of the first through hole.

5. The bionic root-type variable-section drainage composite pile structure according to claim 1, characterized in that: A plurality of fixing strips are installed on the outer wall of the pile core, and the outer wall of the fixing strip is movably connected to the inner wall of the track. A plurality of water inlets are provided on one side of the fixing strip, and the water inlets are respectively connected to one end of the horizontal drainage branch pipe. A plurality of second rubber sealing rings are provided on one side of the fixing strip, and the plurality of second rubber sealing rings are respectively provided on the outside of one end of the water inlet, and the plurality of second rubber sealing rings respectively correspond to the plurality of first rubber sealing rings one by one.

6. The bionic root-type variable-section drainage composite pile structure according to claim 1, characterized in that: A base is installed at the bottom of the pile core, a rubber pad is installed on the outer wall of the base, and the outer wall of the rubber pad is movably connected to the inner wall of the cylindrical segment; a plurality of water storage chambers are provided on the top of the base, and one end of the water storage chamber is connected to the bottom of the longitudinal drainage main pipe.

7. The bionic root-type variable-section drainage composite pile structure according to claim 1, characterized in that: The outer wall of the cylindrical segment is fixedly connected with several semicircular blocks, and the outer wall of the cylindrical segment is provided with several second through holes, and the several second through holes are respectively arranged under the several semicircular blocks, and a second protective filter is provided at one end of the second through hole close to the outer side.

8. The bionic root-type variable-section drainage composite pile structure according to claim 1, characterized in that: The first protective filter screen and the second protective filter screen are made of stainless steel and coated with a PTFE hydrophobic coating on their surface to reduce the probability of clay adsorption and avoid clogging of the holes by sediment.

9. The bionic root-type variable-section drainage composite pile structure according to claim 1, characterized in that: A pile cap is provided on the top of the variable-section pile body, a display screen is embedded on the top of the pile cap, and a microprocessor is embedded inside the pile cap; the microprocessor is electrically connected to a flow sensor, a stress monitoring sensor, a BIM parametric modeling module and an Internet of Things communication module, and the flow sensor is respectively arranged inside the longitudinal drainage main pipe and the transverse drainage branch pipe, and the stress monitoring sensor is embedded in the inner wall of the cylindrical segment, the BIM parametric modeling module is used to construct a parametric three-dimensional model of the pile structure, and simulate the mechanical response and drainage efficiency of the pile body under different geological conditions and load states in real time, and the Internet of Things communication module is used to send the collected data to the cloud or local control center.

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