Bionic root type variable cross-section drainage composite pile structure

Abstract

The application discloses a kind of bionic root type variable cross-section drainage composite pile structures, belong to drainage composite pile technical field.The application includes variable cross-section pile body, bionic composite drainage structure, reinforcing structure and connecting structure, variable cross-section pile body includes several groups of same diameter cylindrical segments, and cylindrical segment is connected another group of cylindrical segment or pile tip by connecting structure respectively;Bionic composite drainage structure includes pile core, and longitudinal drainage main pipe is provided along axis, and radial drainage branch pipe is penetrated through pile core, and pile core is movably connected in the inside of variable cross-section pile body;Reinforcing structure includes that prestressed steel tendon is arranged in the inside of variable cross-section pile body and the reinforcing rib that variable cross-section pile body outer wall is arranged is formed;Connecting structure includes transition sleeve, and the top and bottom of transition sleeve outer wall are respectively provided with several grooves.The application can be flexibly adapted to complex geological conditions, and also ensure construction convenience and structural overall stability.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of drainage composite piles, in particular to a bionic root system type variable cross-section drainage composite pile structure. BACKGROUND

[0002] In landslide treatment, foundation pit support and other projects, groundwater pressure is a key factor leading to instability, and drainage composite piles need to be used for drainage treatment to ensure soft soil consolidation and improve the bearing capacity.

[0003] The existing drainage composite piles have the following defects:

[0004] 1. Patent document CN207469232U discloses a prefabricated concrete drainage pile, which comprises a prefabricated reinforced concrete pipe in a stepped shape, a prefabricated water permeable concrete pipe is arranged in the prefabricated reinforced concrete pipe, and a drainage channel is arranged in the prefabricated water permeable concrete pipe; a plurality of water permeable units are arranged on the prefabricated reinforced concrete pipe in a circumferential direction, the water permeable unit comprises a vertical hole, a plurality of horizontal holes arranged on the prefabricated reinforced concrete pipe are communicated with the vertical hole, and the vertical hole is connected with the prefabricated water permeable concrete pipe; a stop rod is slidably connected in the vertical hole, a water absorption ball is slidably connected in the horizontal hole, the water absorption ball is connected with an elastic element, and one end of the elastic element away from the water absorption ball is connected to the stop rod. The scheme increases the contact area between the drainage pile and the soil layer to increase the side resistance of the drainage pile, improves the stability of the drainage pile, and enables pore water to be smoothly discharged through the cooperation of the horizontal hole, the vertical hole and the prefabricated water permeable concrete pipe, thereby improving the drainage effect of the drainage pile. However, the existing drainage pile has the technical problems of low drainage efficiency and inability to adapt to complex geology;

[0005] 2. Patent document CN214530623U discloses a prefabricated concrete drainage pile, which comprises an outer column body, a fixed drill rod and a reinforcing plate, the upper and lower sides of the outer column body are embedded and installed in a chuck, a middle shaft is rotatably connected in the inside of the chuck, the fixed drill rod is rotatably installed at the lower end of the outer column body, longitudinal sliding rods are symmetrically installed at the inside of the outer column body, drainage holes are formed in the side surfaces of the inner column body and the outer column body, a positioning plate is fixedly installed on the inside of the inner column body, the inside of the inner column body is connected with a hollow cylindrical ring through a transverse sliding rod, the reinforcing plate is installed outside the transverse sliding rod, and the lower end of the reinforcing plate is connected with the longitudinal sliding rod through a support rod. The scheme adopts a novel structure design, so that the device can pre-fix the installation position of the drainage pile, improve the stability of the drainage pile installation structure, and the device is provided with a reinforcing structure to improve the anti-extrusion performance of the drainage pile installation and use. However, the existing drainage pile has the technical problems of lack of barrier to prevent silt from invading and low drainage efficiency;

[0006] 3. Patent document CN1053479C discloses a rigid drainage pile, a cone is made at the lower end of the pile body, a main drainage pipe is made in the pile body, a water pumping pipe is connected to the upper end of the main drainage pipe, water permeable concrete is installed in the main drainage pipe near the tip of the cone, a groove is made in the middle and upper part of the vertical outer surface of the pile body, a water pipe is made between the groove and the main drainage pipe, and a drainage plate is installed in the groove. The scheme has simple structure, high pile body structural strength, saves pile material and construction investment, fast pile sinking, high bearing capacity and small settlement, but the existing drainage pile has technical problems of being unable to remotely synchronize data and remotely warn. SUMMARY

[0007] The present application aims to provide a bionic root system type variable cross-section drainage composite pile structure, which uses high permeability concrete material for the variable cross-section pile body, and the leakage coefficient is improved by three orders of magnitude compared with traditional piles, and the internal longitudinal drainage main pipe and the transverse drainage branch pipe are matched to realize efficient drainage and dynamic adjustment of groundwater pressure, quickly dredge pore water and inhibit foundation settlement, and the prestressed steel tendon in the reinforcement structure and the external reinforcing rib form a three-dimensional strengthening system to greatly improve the compression resistance, tensile resistance and shear resistance of the pile body. The modularly designed cylindrical segments are tightly spliced through the connecting structure with limiting components, which can flexibly adapt to complex geological conditions and ensure construction convenience and structural overall stability, so as to solve the problems in the above background art.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a bionic root system type variable cross-section drainage composite pile structure, comprising a variable cross-section pile body, a bionic composite drainage structure, a reinforcement structure and a connecting structure, the variable cross-section pile body comprises a plurality of groups of cylindrical segments with the same diameter, the cylindrical segments are connected to another group of cylindrical segments or a pile tip through the connecting structure respectively; the bionic composite drainage structure comprises a pile core, the pile core comprises a longitudinal drainage main pipe arranged along an axis and a transverse drainage branch pipe penetrating through the pile core radially, and the pile core is movably connected to the inside of the variable cross-section pile body; the reinforcement structure comprises a prestressed steel tendon arranged in the inside of the variable cross-section pile body and a reinforcing rib arranged on the outer wall of the variable cross-section pile body; the connecting structure comprises a transition sleeve, a plurality of grooves are formed in the top and bottom of the outer wall of the transition sleeve respectively, limiting components are formed in the inner walls of the grooves, and the limiting components are used for limiting the fixed cylindrical segments or the pile tip; the variable cross-section pile body is made of high permeability concrete material.

[0009] Preferably, the limiting component comprises a through groove, the through groove is formed in the inner wall of the groove, a sliding groove is formed in the inner wall of the through groove, a sliding block is movably connected to the inner wall of the sliding groove, a fixed rod is penetratingly installed on one side of the sliding block, both ends of the fixed rod are fixedly connected to both ends of the inner wall of the sliding groove, a pressure spring is movably connected to the outer wall of the fixed rod, and one end of the pressure spring is installed on one side of the sliding block.

[0010] Preferably, one end of the sliding block is provided with a limiting block, and the outer wall of the limiting block is movably connected to the inner wall of the through slot; one end of the limiting block is provided with a pull ring; the other end of the outer wall of the limiting block is movably connected to the inner wall of the limiting slot; and the limiting slot is arranged on the outer wall of the cylindrical segment or 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; the inner wall of each first through hole is provided with a first protective screen near one end of the outer side; the inner wall of the cylindrical segment is provided with a track; the inner wall of the track is arranged at the other end of the first through hole; the inner wall of the track is provided with a plurality of first rubber sealing rings; and the plurality of first rubber sealing rings are arranged on the outer side of the other end of the first through hole.

[0012] Preferably, the outer wall of the pile core is provided with a plurality of fixing strips; the outer wall of each fixing strip is movably connected to the inner wall of the track; one side of each fixing strip is provided with a plurality of water inlets; each water inlet is connected to one end of the horizontal drainage branch pipe; one side of each fixing strip is provided with a plurality of second rubber sealing rings; each second rubber sealing ring is arranged on the outer side of one end of the water inlet; and each second rubber sealing ring corresponds to one first rubber sealing ring.

[0013] Preferably, the bottom of the pile core is provided with a base; the outer wall of the base is provided with a rubber pad; and the outer wall of the rubber pad is movably connected to the inner wall of the cylindrical segment; and the top of the base is provided with a plurality of water storage cavities; one end of each water storage cavity is connected to the bottom of the vertical drainage main pipe.

[0014] Preferably, the outer wall of the cylindrical segment is fixedly connected to a plurality of semicircular blocks; the outer wall of the cylindrical segment is provided with a plurality of second through holes; each second through hole is arranged below one of the semicircular blocks; and one end of each second through hole is provided with a second protective screen.

[0015] Preferably, the first protective screen and the second protective screen are made of stainless steel and coated with a PTFE hydrophobic coating on the surface, which is used to reduce the adsorption probability of clay and avoid the situation of sand blocking the holes.

[0016] Preferably, the top of the variable cross-section pile body is provided with a pile cap; the top of the pile cap is embedded with a display screen; and a microprocessor is embedded and installed in the pile cap; the microprocessor is electrically connected to a flow sensor, a stress monitoring sensor, a BIM parameterized modeling module, and an Internet of Things communication module; the flow sensor is arranged in the vertical drainage main pipe and the horizontal drainage branch pipe; the stress monitoring sensor is embedded in the inner wall of the cylindrical segment; the BIM parameterized modeling module is used to construct a parameterized three-dimensional model of the pile body structure, to 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 the local control center.

[0017] Compared with the prior art, the beneficial effects of the present application are as follows:

[0018] 1. The present application uses high permeability concrete material for the variable cross-section pile body, the leakage coefficient is improved by three orders of magnitude compared with the traditional pile, and the internal longitudinal drainage main pipe and the transverse drainage branch pipe are matched to realize efficient drainage and dynamic regulation of groundwater pressure, can quickly dredge pore water and inhibit foundation settlement, the prestressed steel tendon in the reinforcement structure and the external reinforcing rib form a three-dimensional reinforcement system, which greatly improves the compression resistance, tensile resistance and shear resistance of the pile body, the modular design of the cylindrical segment is tightly spliced through the connecting structure with limiting components, which can flexibly adapt to complex geological conditions and ensure construction convenience and structural overall stability;

[0019] 2. The present application significantly optimizes the drainage performance and structural sealing performance through the cooperative design of the cylindrical segment and the pile core, the semicircular block of the outer wall of the cylindrical segment is combined with the second protective filter screen to realize multi-stage filtration drainage while enhancing the pile-soil friction, the sliding connection of the inner wall track and the fixed strip cooperates with the close fit of the first rubber sealing ring and the second rubber sealing ring to form a dynamic sealing interface, which not only ensures the flexible disassembly of the pile core, but also ensures the flowability of water flow into the transverse drainage branch pipe, the combination design of the base and the rubber pad further strengthens the bottom sealing to ensure the efficient connection of the water cavity and the longitudinal drainage main pipe, realizing the directional collection and rapid discharge of groundwater;

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

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

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

[0023] Figure 3 is a schematic diagram of the Figure 2 is an enlarged structure schematic diagram of position A in the present application;

[0024] Figure 4 is a schematic diagram of the overall top view structure of the present application;

[0025] Figure 5Amplification structure schematic diagram at B in the present application Figure 4 Amplification structure schematic diagram at B in the present application

[0026] Figure 6 Amplification structure schematic diagram at B in the present application

[0027] Figure 7 Amplification structure schematic diagram at B in the present application

[0028] Figure 8 Amplification structure schematic diagram at B in the present application

[0029] In the figure: 1, variable cross-section pile body; 4, connecting 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, sliding groove; 17, sliding block; 18, fixed rod; 19, pressure spring; 20, limiting block; 21, pull ring; 22, limiting groove; 24, first through hole; 25, first protective filter screen; 26, track; 27, first rubber sealing ring; 28, fixed strip; 29, water inlet; 30, second rubber sealing ring; 31, base; 32, rubber pad; 34, water storage cavity; 35, semicircular block; 36, second through hole; 37, second protective filter screen; 38, pile cap; 39, display screen; 40, microprocessor; 41, flow sensor; 42, stress monitoring sensor; 43, BIM parameterized modeling module; 44, Internet of Things communication module. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0031] Please refer to Figures 1-8The embodiment provides a technical scheme: a bionic root type variable cross-section drainage composite pile structure, which comprises a variable cross-section pile body 1, a bionic composite drainage structure, a reinforcing structure and a connecting structure 4, the variable cross-section pile body 1 comprises a plurality of groups of cylindrical segments 5 with the same diameter, the cylindrical segments 5 are connected to another group of cylindrical segments 5 or a pile tip 6 through the connecting structure 4 respectively, the bionic composite drainage structure comprises a pile core 7, the pile core 7 comprises a longitudinal drainage main pipe 8 arranged along an axis and a transverse drainage branch pipe 9 penetrating through the pile core 7 in a radial direction, and the pile core 7 is movably connected to the inside of the variable cross-section pile body 1, the reinforcing structure comprises prestressed steel bars 11 arranged in the inside of the variable cross-section pile body 1 and reinforcing ribs 12 arranged on the outer wall of the variable cross-section pile body 1, and the connecting structure 4 comprises a transition sleeve 13, a plurality of grooves 14 are formed in the top and bottom of the outer wall of the transition sleeve 13 respectively, a limiting component is arranged on the inner wall of the groove 14, and the limiting component is used for limiting the fixed cylindrical segment 5 or the pile tip 6; and the variable cross-section pile body 1 is made of high-permeability concrete material.

[0032] By using the high-permeability concrete material for the variable cross-section pile body 1, the leakage coefficient is improved by three orders of magnitude compared with that of a traditional pile, and in combination with the internal longitudinal drainage main pipe 8 and the transverse drainage branch pipe 9, efficient drainage and dynamic adjustment of underground water pressure are realized, pore water can be quickly dredged, and ground settlement can be inhibited, the prestressed steel bars 11 in the reinforcing structure and the external reinforcing ribs 12 form a three-dimensional reinforcing system, the compression resistance, tensile resistance and shear resistance of the pile body are greatly improved, the modularly designed cylindrical segments 5 are tightly spliced through the connecting structure 4 with the limiting component, the complex geological conditions can be flexibly adapted, and the construction convenience and the overall stability of the structure are ensured, in addition, the variable cross-section shape of the bionic root system enhances the pile-soil synergistic effect, so that the structure has efficient drainage, long-term bearing and environmental adaptability in the scenes of soft foundation treatment and slope reinforcement.

[0033] The limiting component comprises a through groove 15, the through groove 15 is arranged on the inner wall of the groove 14, a sliding groove 16 is arranged on the inner wall of the through groove 15, a sliding block 17 is movably connected to the inner wall of the sliding groove 16, a fixed rod 18 is arranged on one side of the sliding block 17 in a penetrating mode, two ends of the fixed rod 18 are fixedly connected to the two ends of the inner wall of the sliding groove 16, a pressure spring 19 is movably connected to the outer wall of the fixed rod 18, and one end of the pressure spring 19 is arranged on one side of the sliding block 17; one end of the sliding block 17 is provided with a limiting block 20, the outer wall of the limiting block 20 is movably connected to the inner wall of the through groove 15, a pull ring 21 is arranged on one end of the limiting block 20, the other end of the outer wall of the limiting block 20 is movably connected to the inner wall of a limiting groove 22, and the limiting groove 22 is arranged on the outer wall of the two ends of the cylindrical segment 5 or the outer wall of one end of the pile tip 6.

[0034] Through the linkage design of the through slot 15, the sliding groove 16, the sliding block 17, the fixed rod 18 and the pressure spring 19, the quick locking and self-adaptive adjustment function of the connecting structure 4 is 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 automatically embedded into the limiting groove 22 by the pressure of the pressure spring 19 to form a rigid locking, ensuring the stability of splicing. The limiting block 20 can be manually retracted by the pull ring 21 to release the constraint, simplifying the disassembly process. The design combines elastic pre-tightening and mechanical limiting mechanisms, which can adapt to small deformation deviations during pile splicing, effectively disperse load stress, avoid stress concentration at the connection, significantly improve the anti-pulling, anti-torsion performance and seismic toughness of the overall structure, and greatly reduce the construction complexity and shorten the construction period. The modular assembly method is suitable for efficient construction and post-maintenance of pile foundations under complex geological conditions.

[0035] The outer wall of the cylindrical segment 5 is provided with a plurality of first through holes 24, and the inner wall of the first through hole 24 is provided with a first protective filter screen 25 close to one end of the outer side. The inner wall of the track 26 is provided on 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 arranged on the outer side of the other end of the first through hole 24. A plurality of fixed strips 28 are installed on the outer wall of the pile core 7, and the outer wall of the fixed strip 28 is movably connected to the inner wall of the track 26. A plurality of water inlets 29 are arranged on one side of the fixed strip 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 arranged on one side of the fixed strip 28, and the plurality of second rubber sealing rings 30 are respectively arranged on the outer side of one end of the water inlet 29. The plurality of second rubber sealing rings 30 are respectively corresponding to the plurality of first rubber sealing rings 27.

[0036] Through the arrangement of the fixed strip 28 and the track 26, the water inlet 29 and the first through hole 24 can form dynamic sealing through the first rubber sealing ring 27 and the second rubber sealing ring 30, which is beneficial to avoid soil intrusion under normal conditions. According to the arrangement of the fixed strip 28 and the water inlet 29, a one-way valve can be added in the water inlet 29 according to the soil state during installation of the pile core 7 to further avoid soil intrusion. The detachable arrangement of the pile core 7 is beneficial to cleaning the position of hole blockage or soil intrusion.

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

[0038] The cylindrical segment 5 and the pile core 7 are cooperatively designed to significantly optimize the drainage performance and structural sealing performance, the semicircular blocks 35 on the outer wall of the cylindrical segment 5 in combination with the second through holes 36 and the second protective filter screen 37 enhance the pile-soil friction while realizing multi-stage filtering drainage and effectively blocking the intrusion of silt, the sliding connection of the inner wall track 26 and the fixed strip 28 in combination with the close 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 disassembly and assembly of the pile core 7, but also ensures the flowability of water flow into the horizontal drainage branch pipe 9, the combined design of the base 31 and the rubber pad 32 further strengthens the bottom sealing, ensures the efficient communication between the water storage cavity 34 and the longitudinal drainage main pipe 8, realizes the directional collection and rapid discharge of underground water, in addition, the modular semicircular blocks 35 and the through hole distribution enhance the lateral displacement resistance and drainage path redundancy of the pile body, so that it has efficient drainage, self-adaptive sealing and long-term stability in soft soil, high water level and complex geology, greatly improves the engineering safety and environmental adaptability.

[0039] The top of the variable cross-section pile body 1 is provided with a pile cap 38, the top of the pile cap 38 is embedded with a display screen 39, and the inside of the pile cap 38 is embedded with a microprocessor 40; the microprocessor 40 is electrically connected with a flow sensor 41, a stress monitoring sensor 42, a BIM parameterized modeling module 43 and an Internet of Things communication module 44, the flow sensor 41 is arranged in the longitudinal drainage main pipe 8 and the horizontal drainage branch pipe 9 respectively, and the stress monitoring sensor 42 is embedded in the inner wall of the cylindrical segment 5, the BIM parameterized modeling module 43 is used to construct a parameterized three-dimensional model of the pile body structure, to 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 the local control center.

[0040] Through the integration of the intelligent monitoring system by the pile cap 38, the real-time digital management and control of the drainage efficiency and the structural health are realized, the embedded display screen 39 directly presents the drainage data collected by the flow sensor 41 and the stress state of the pile body fed back by the stress monitoring sensor 42, the BIM parameterized modeling module 43 dynamically simulates the mechanical response and the drainage path of the pile foundation under different working conditions, provides visual decision basis for engineering optimization, the Internet of Things communication module 44 synchronizes the multi-dimensional monitoring data to the cloud platform, supports remote early warning and big data analysis, forms a closed-loop management of "monitoring-evaluation-regulation", through the flow anomaly identification, stress overrun early warning and geological adaptability simulation, the system can actively prevent the risk of clogging and structural damage, prolong the service life of the pile body, at the same time, improve the construction accuracy and operation and maintenance efficiency, and promote the development of the pile foundation engineering to the intelligent and self-adaptive direction.

[0041] The above description of the present application and its embodiments is illustrative, not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it, without departing from the purpose of the present application, similar structural modes and embodiments can be designed without creativity, which should belong to the protection scope of the present application.

Claims

1. A biomimetic root-type variable cross-section drainage composite pile structure, characterized in that: The system comprises a variable cross-section pile, a biomimetic composite drainage structure, a reinforcement structure, and a connecting structure. The variable cross-section pile includes several sets of cylindrical segments with the same diameter, each connected to another set of cylindrical segments or a pile tip via a connecting structure. The biomimetic composite drainage structure includes a pile core, which includes a longitudinal drainage main pipe arranged along the axis and a transverse drainage branch pipe that penetrates the pile core radially. The pile core is movably connected to the interior of the variable cross-section pile. The reinforcement structure includes prestressed steel reinforcement bundles disposed inside the variable cross-section pile and reinforcing ribs disposed on the outer wall of the variable cross-section pile. The connecting structure includes a transition sleeve, the top and bottom of which are respectively provided with several grooves. The inner wall of each groove is provided with a limiting component, which is used to limit and fix the cylindrical segments or pile tip. The variable cross-section pile is made of highly permeable concrete. The limiting component includes a through groove, which is formed on the inner wall of the groove. A sliding groove is formed on the inner wall of the through groove. A slider is movably connected to the inner wall of the sliding groove. A fixed rod is installed through one side of the slider. Both ends of the fixed rod are fixedly connected to the two ends of the inner wall of the sliding groove. A pressure spring is movably connected to the outer wall of the fixed rod. One end of the pressure spring is installed on one side of the slider. A limiting block is installed at one end of the slider. 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. 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 formed at both ends of the outer wall of the cylindrical segment or at one end of the outer wall of the pile tip. The outer wall of the cylindrical segment has several first through holes, and a first protective filter screen is provided at one end of the inner wall of the first through hole near the outer side. The inner wall of the cylindrical segment is provided with a track, and the inner wall of the track is located at the other end of the first through hole. Several first rubber sealing rings are installed on the inner wall of the track, and the several first rubber sealing rings are respectively located on the outer side of the other end of the first through hole. The outer wall of the pile core is provided with several fixing strips, and the outer wall of the fixing strips is movably connected to the inner wall of the track. Several water inlets are provided on one side of the fixing strips, and the water inlets are respectively connected to one end of the transverse drainage branch pipe. Several second rubber sealing rings are provided on one side of the fixing strips, and the several second rubber sealing rings are respectively located on the outer side of one end of the water inlet, and the several second rubber sealing rings correspond one-to-one with the several first rubber sealing rings. The bottom of the pile core is equipped with a base, and the outer wall of the base is equipped with a rubber pad, and the outer wall of the rubber pad is movably connected to the inner wall of the cylindrical segment; the top of the base is provided with several water storage chambers, and one end of the water storage chamber is connected to the bottom of the longitudinal drainage main pipe; several semi-circular blocks are fixedly connected to the outer wall of the cylindrical segment, and several second through holes are opened on the outer wall of the cylindrical segment, and several second through holes are respectively located below several of the semi-circular blocks, and a second protective filter screen is provided at the end of the second through hole near the outer side.

2. The biomimetic root-type variable cross-section drainage composite pile structure according to claim 1, characterized in that: The first and second protective filters are made of stainless steel and coated with a PTFE hydrophobic coating to reduce the probability of clay adsorption and prevent clogging of the pores by mud and sand.

3. The biomimetic root-type variable cross-section drainage composite pile structure according to claim 1, characterized in that: The top of the variable cross-section pile is equipped with a pile cap, and a display screen is embedded in the top of the pile cap. 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 IoT communication module. The flow sensor is respectively installed inside the longitudinal drainage main pipe and the transverse drainage branch pipe. 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 under different geological conditions and load states in real time. The IoT communication module is used to send the collected data to the cloud or the local control center.

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