Drainage pile structure

Abstract

The utility model discloses a drainage pile structure which comprises a shell pipe system and a core pipe system, the shell pipe system comprises a hollow columnar shell wall and a permeable pipe obliquely arranged on the shell wall in a penetrating mode, the core pipe system comprises a plurality of layers of water conveying structures, a drainage stand pipe and a pile core, the pile core is arranged in an inner cavity of the shell wall, and the vertical drainage stand pipe is arranged in the center of the pile core. A plurality of layers of water conveying structures are arranged in the pile core at intervals, each layer of water conveying structure comprises an arc-shaped sheet-shaped water collecting contact and a water conveying transverse pipe, the water collecting contacts are attached to the inner wall of the shell wall and arranged in a circular ring shape in a surrounding mode, the end face, close to the shell wall, of each water collecting contact correspondingly covers and is communicated with a through water pipe, and the bottom of the end face, away from the shell wall, of each water collecting contact is communicated with a drainage vertical pipe through the corresponding water conveying transverse pipe. Through one-to-many arrangement of the water conveying transverse pipes and the water collecting contact and the permeable pipes in the shell pipe system, the influence of water in the water conveying transverse pipes on the external environment is reduced, the water overflow path is restrained, the influence range of water in the permeable pipes on the core pipe system is limited, and the phenomenon that an inner core is damaged due to frost heaving is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of drainage piles and discloses a drainage pile structure. Background Art

[0002] In the northwest region of China, the seasonal difference in precipitation is obvious, and channels usually supply water seasonally from spring to autumn. During the period when the channels are in water, there is generally a phenomenon of canal water infiltration. After the water supply stops, the canal water seeps back, and the channels change from wet to dry and are in an unsaturated state. During this period, the channels often show extremely serious damage. The reason is that the anti-slide piles on both sides of the channels block the drainage path of the water in the slope, resulting in the enrichment of the water in the slope soil and causing slope failures such as landslides.

[0003] Drainage piles have excellent water collection and drainage capabilities, can effectively reduce the soil saturation and the water level infiltration line, and are helpful for improving the slope stability when arranged on both sides of the channels. The existing permeable piles are strengthened with permeable geotextiles and a two-way geogrid is added to form a geotextile cylinder to improve the drainage piles and avoid the occurrence of sand blocking the permeable holes. There are also methods to suppress the liquefaction of sandy soil under seismic loads by using drainage piles, and the internal structure of the drainage piles is modified by methods such as modifying the inner core structure and filling permeable materials to balance the water permeability and shear resistance of the piles.

[0004] However, in actual applications, the drainage piles beside the channels are mostly in freeze-thaw environments, and the above methods do not consider the long-term use of drainage piles under freeze-thaw cycles. In particular, freeze-thaw cycles will affect the structural strength, water permeability, and slope retaining capacity of drainage piles, that is, they will affect the normal use of the drainage piles arranged on both sides of the channels.

[0005] Therefore, there is an urgent need for a drainage pile structure to solve the problem that the structure of the existing drainage piles is easily affected by freeze-thaw cycles when in a freeze-thaw environment. Summary of the Utility Model

[0006] Aiming at the deficiencies in the prior art, the utility model provides a drainage pile structure to solve the problem that the structure of the existing drainage piles is easily affected by freeze-thaw cycles when in a freeze-thaw environment.

[0007] To achieve the above object, the utility model adopts the following technical solutions:

[0008] A drainage pile structure, characterized in that: it includes a shell tube system and a core tube system. The shell tube system includes a hollow columnar shell wall and several water permeable pipes obliquely penetrating through the shell wall. The core tube system includes several layers of water conveyance structures, a drainage riser, and a pile core. A pile core is arranged in the inner cavity of the shell wall, a vertical drainage riser is arranged at the center of the pile core, and several layers of water conveyance structures are also arranged at intervals from bottom to top in the pile core. Each layer of water conveyance structure includes several arc-shaped sheet-like water collection contacts and several water conveyance cross pipes. The several water collection contacts are attached to the inner wall of the shell wall and arranged in a ring shape. The end face of each water collection contact close to the shell wall respectively covers and communicates with several water permeable pipes, and the bottom of the end face far from the shell wall is communicated with the drainage riser through the water conveyance cross pipe.

[0009] To optimize the above technical solution, the specific measures taken also include:

[0010] Further, the water conveyance cross pipe is arranged in an inclined posture with the outer side higher than the inner side.

[0011] Further, the water conveyance cross pipe has an arc-edge fan-shaped structure. The end of the water conveyance cross pipe close to the water collection contact is a wide fan surface that fits the bottom side wall of the water collection contact, and the end close to the drainage riser is a narrow fan surface that fits the outer side wall of the drainage riser. The side wall of the water conveyance cross pipe is an inwardly concave arc-shaped side surface.

[0012] Further, the core tube system also includes an expansion sealing belt. The expansion sealing belt is arranged at the joint of the water collection contact and the inner wall of the shell wall, and the expansion sealing belt is arranged around the peripheral side of the port of the water collection contact and is in direct contact with the inner wall of the shell wall.

[0013] Further, the interval distance between adjacent water permeable pipes is the same, several water permeable pipes are arranged in a matrix, and the water permeable pipes are all arranged in an inclined posture with the outer side higher than the inner side.

[0014] Further, a layer of geotextile layer is connected to the outside of the shell wall through a water-soluble adhesive layer.

[0015] Further, it also includes an organic water filtration system. The organic water filtration system includes several layers of steel bar structures and water permeable filter materials. Several layers of steel bar structures are stacked from bottom to top outside the shell tube system. Each layer of steel bar structure includes several steel cages arranged around the shell tube system, and the steel cages are filled with water permeable filter materials.

[0016] Further, the steel cage includes steel bars, steel bar meshes, and backing plates. The steel bars form an arc-shaped columnar framework. Steel bar meshes are arranged around the four sides and the bottom of the arc-shaped columnar framework. A backing plate is laid on the upper end of the steel bar mesh at the bottom. Several steel cages can be spliced around to form a circular ring.

[0017] Further, the bottom of the steel cage is arranged in an inclined posture with the outer side higher than the inner side.

[0018] Further, it further includes a longitudinal water collecting and draining pipe and a transverse water conveying pipe. The shell pipe system and the core pipe system are jointly arranged on both sides of the channel. The longitudinal water collecting and draining pipe is laid at the bottom of the channel. The longitudinal water collecting and draining pipe is respectively connected to the corresponding drainage vertical pipes through the transverse water conveying pipes, and the height of the transverse water conveying pipes is gradually decreased from the longitudinal water collecting and draining pipe to the drainage vertical pipes.

[0019] The beneficial effects of the present utility model are as follows:

[0020] Through the cooperative arrangement of the shell pipe system and the core pipe system, the present utility model utilizes the shell pipe system to play the roles of slope retaining and water body transmission, and utilizes the core pipe system located at the very center of the overall structure to play the roles of slope retaining and water body enrichment. Through the structural arrangement of the water conveying horizontal pipes, while ensuring water collection, the hydrophobic and water collection efficiency is accelerated, the layout space is effectively saved, the influence of the water in the water conveying horizontal pipes on the external environment is reduced, the water overflow path is blocked by means of the restraint effect of the water conveying horizontal pipes, and the occurrence of the phenomenon of frost heaving damage to the inner core is avoided. Through the setting of the one-to-many corresponding covering relationship between the water collection contacts and the permeable pipes in the shell pipe system, the effective collection of water bodies is ensured, and the influence range of the water bodies in the permeable pipes on the core pipe system is restricted. In this way, the influence of the freeze-thaw cycle on the structural strength, water permeability and slope retaining ability of the drainage pile is reduced, so that it still has good structural strength and retaining ability under the long-term freeze-thaw environment.

[0021] The present utility model organically combines the traditional drainage pile and the stiff core composite pile, enhances the lateral friction resistance between structures, solves the problem of the low pile body strength of the traditional drainage pile while ensuring the drainage characteristics of the pile body. The modular structural design of each system effectively reduces the complexity of the construction process, and the integral setting of the structures within the system reduces the problem of the reduction of the structural quality caused by the narrow working environment and the inconvenience of modular assembly. The design of the geotextile layer on the outer side of the shell wall effectively weakens the frost heaving effect on the pile body caused by the frost heaving of the soil, and realizes the long-term play of the retaining effect of the pile on the slope soil under the long-term freeze-thaw cycle.

[0022] The present utility model uses silicone solution to treat construction waste aggregates to form a permeable filter material, gives full play to the hydrophobicity of the silicone material, accelerates the hydrophobic rate in the structure while ensuring the sand blocking and hydrophobic performance of the structure body, avoids the long-term retention of water bodies in the permeable filter material, and reduces the occurrence of cracking damage caused by the freezing of water bodies. The widely distributed voids in the permeable filter material provide a deformation buffer area for the freeze-thaw cycle of the drainage pile. The self-inclined layout forms of the cushion plate, the permeable pipe and the water conveying horizontal pipe effectively improve the water permeability of the structure, accelerate the drainage rate, reduce the phenomenon of water body retention, avoid the occurrence of frost heaving damage under the freeze-thaw cycle, and ensure the long-term effectiveness of the retaining effect of the pile on the slope soil. Description of the Drawings

[0023] Figure 1 Schematic diagram of the use of a drainage pile structure proposed by the present utility model;

[0024] Figure 2 Schematic cross-sectional structure diagram of a drainage pile structure proposed by the present utility model;

[0025] Figure 3 Schematic cross-sectional structure diagram of the organic water filtration system and the shell tube system of a drainage pile structure proposed by the present utility model;

[0026] Figure 4 Partial structure diagram of the steel reinforcement cage of a drainage pile structure proposed by the present utility model;

[0027] Figure 5 Top view schematic diagram of the distribution of the steel reinforcement cage of a drainage pile structure proposed by the present utility model;

[0028] Figure 6 Structure diagram of the shell tube system of a drainage pile structure proposed by the present utility model;

[0029] Figure 7 Schematic cross-sectional structure diagram of the shell tube system and the core tube system of a drainage pile structure proposed by the present utility model;

[0030] Figure 8 Schematic cross-sectional diagram of the setting of the expansion sealing belt of a drainage pile structure proposed by the present utility model;

[0031] Figure 9 Top view schematic diagram of the structure of the shell tube system and the core tube system of a drainage pile structure proposed by the present utility model.

[0032] Reference numerals: 1 - organic water filtration system, 11 - steel reinforcement cage, 111 - steel bars, 112 - steel bar mesh, 12 - backing plate, 13 - permeable filter material; 2 - shell tube system, 21 - geotextile layer, 22 - shell wall, 23 - permeable pipe; 3 - core tube system, 31 - expansion sealing belt, 32 - water collection contact, 33 - water delivery cross pipe, 34 - drainage riser, 35 - pile core; 4 - channel; 5 - slope soil mass; 6 - longitudinal water collection and drainage pipe; 7 - transverse water delivery pipe. Detailed implementation manners

[0033] The present utility model will be described in detail below with reference to the accompanying drawings.

[0034] As shown in the attached Figure 2 、 attached Figure 6 、 attached Figure 7 and attached Figure 9As shown in the figure, a drainage pile structure according to an embodiment of the present utility model includes a shell tube system 2 and a core tube system 3. The shell tube system 2 includes a hollow columnar shell wall 22 and several water permeable pipes 23 obliquely penetrating through the shell wall 22. The core tube system 3 includes several layers of water conveyance structures, a drainage riser 34, and a pile core 35. A pile core 35 is provided in the inner cavity of the shell wall 22. A vertical drainage riser 34 is provided at the center of the pile core 35. Several layers of water conveyance structures are also provided at intervals from bottom to top in the pile core 35. Each layer of water conveyance structure includes several arc-shaped sheet-like water collection contacts 32 and several water conveyance horizontal pipes 33. Several water collection contacts 32 are attached to the inner wall of the shell wall 22 and arranged in a circular ring. The end face of each water collection contact 32 close to the shell wall 22 respectively covers and communicates with several water permeable pipes 23. The bottom of the end face far from the shell wall 22 is connected to the drainage riser 34 through a water conveyance horizontal pipe 33. The water conveyance horizontal pipes 33 of each water collection contact 32 are arranged at intervals from each other, and adjacent water conveyance horizontal pipes 33 are not directly connected. The interval is the pile core 35.

[0035] Through the cooperative setting of the shell tube system 2 and the core tube system 3, the present utility model utilizes the shell tube system 2 to play the roles of slope support and water body transfer, and utilizes the core tube system 3 located at the very center of the overall structure to play the roles of slope support and water body enrichment. Through the structural setting of the water conveyance horizontal pipes 33, while ensuring water collection, the hydrophobic water collection efficiency is accelerated, the layout space is effectively saved, the influence of the water in the water conveyance horizontal pipes 33 on the external environment is reduced, the overflow path of water is blocked by the restraint effect of the water conveyance horizontal pipes 33, and the occurrence of the phenomenon of frost heaving damage to the inner core is avoided. Through the one-to-many corresponding covering relationship setting between the water collection contacts 32 and the water permeable pipes 23 in the shell tube system 2, the effective collection of water bodies is ensured, and the influence range of the water bodies in the water permeable pipes 22 on the core tube system 3 is limited. In this way, the influence of freeze-thaw cycles on the strength, water permeability, and slope support capacity of the drainage pile structure is reduced, so that it still has good structural strength and support capacity in a long-term freeze-thaw environment.

[0036] In this embodiment, the pile core 35 adopts the manufacturing process of cast-in-place concrete to pour the intermediate space among the shell wall 22, the water collection contacts 32, the water conveyance horizontal pipes 33, and the drainage riser 34, and jointly forms a stiff core structure with the water collection contacts 32, the water conveyance horizontal pipes 33, and the drainage riser 34, enhancing the lateral friction resistance between the core tube system 3 and the shell tube system 2, solving the problem of the structural strength of the hollow interior of the traditional drainage pile, and being able to achieve the dual improvement of the pile body strength and the long-term support capacity of the drainage pile.

[0037] Among them, the pile core 35 is a concrete structure formed by integral pouring, which is consistent with the height of the pile body. The shell wall 22 is a tubular structure and can be integrally prefabricated with the water permeable pipe 23 in a factory. The water collection contact 32 is made of high-strength plastic structure. The water delivery horizontal pipe 33 and the water collection contact 32 are made of the same material and are integrally manufactured. The drainage vertical pipe 34 is a PVC pipe, and is connected to the lower end of the water delivery horizontal pipe 33 through adhesive bonding with sealant. A water permeable filter material is provided at the lowermost part of the drainage vertical pipe. The drainage vertical pipe 34 is located at the center of the core pipe system 3 and is as high as the pile body. An untreated water permeable filter material is provided at the lower part of the drainage vertical pipe 34 or the overall structure to ensure that the inside of the drainage vertical pipe 34 is not blocked, effectively extending the service life of the drainage vertical pipe 34 or the overall structure.

[0038] In another specific embodiment, the water delivery horizontal pipe 33 is arranged in an inclined posture with the outer side higher and the inner side lower. In this way, to a certain extent, the inclined water delivery horizontal pipe 33 restricts the path of water overflow, avoiding the occurrence of frost heaving damage to the inner core.

[0039] In another specific embodiment, the water delivery horizontal pipe 33 has an arc-edge fan-shaped structure. One end of the water delivery horizontal pipe 33 close to the water collection contact 32 is a wide fan surface that fits the bottom side wall of the water collection contact 32, and the end close to the drainage vertical pipe 34 is a narrow fan surface that fits the outer side wall of the drainage vertical pipe 34. The side wall of the water delivery horizontal pipe 33 is an inwardly concave arc-shaped side surface. In this way, through the structural setting of the water delivery horizontal pipe 33, while ensuring water collection, the hydrophobic and water collection efficiency is accelerated, the layout space is effectively saved, the influence of the water in the water delivery horizontal pipe 33 on the external environment is reduced, and the path of water overflow is blocked by the restraint of the water delivery horizontal pipe 33, avoiding the occurrence of frost heaving damage to the inner core. In this embodiment, the water delivery horizontal pipe 33 can be synchronously arranged in an inclined posture with the outer side higher and the inner side lower to further ensure the use effect.

[0040] As shown in the Figure 7 accompanying drawings, in another specific embodiment, the core pipe system 3 further includes an expansion seal strip 31. The expansion seal strip 31 is arranged at the joint of the water collection contact 32 and the inner wall of the shell wall 22, and the expansion seal strip 31 is arranged around the circumferential side of the port of the water collection contact 32 and is in direct contact with the inner wall of the shell wall 22. Among them, the expansion seal strip 31 is a water-absorbing and expanding material. After absorbing water, the expansion seal strip 31 expands, improving the tightness between the water collection contact 32 and the shell pipe 22, ensuring that water is effectively transported from the water permeable pipe 23 to the water collection contact 32, and avoiding the occurrence of frost heaving caused by water overflow.

[0041] In another specific embodiment, the adjacent water-permeable pipes 23 have the same interval distance, and several water-permeable pipes 23 are arranged in a matrix pattern, and the water-permeable pipes 23 are all arranged in an inclined posture with the outer side higher and the inner side lower. Among them, the obliquely penetrating water-permeable pipes 23 arranged on the shell wall 22 ensure the effective migration of water while accelerating the hydrophobic rate and avoiding the phenomenon that water stays in the organic water filtration system 1 for a long time. Among them, the water-permeable pipe can be made of Pvc pipe material.

[0042] In another specific embodiment, a layer of geotextile layer 21 is also connected to the outer side of the shell wall 22 through a water-soluble glue layer. The geotextile layer 21 is a multi-layer geotextile with good water permeability. In this embodiment, the geotextile layer 21 is located at the outermost part of the shell pipe system 2 and is adhered to the shell wall 22 through the water-soluble glue layer. The shell wall 22 is a precast concrete member; the geotextile layer 21 is adhered to the shell wall 22 through the water-soluble glue layer, which ensures that the geotextile layer 21 and the shell wall 22 can enter the soil together. At the same time, the property that the water-soluble glue layer separates when encountering water ensures that after the geotextile layer 21 freezes and swells, the frost heaving force does not directly act on the shell wall 22, suppressing the occurrence of frost heaving phenomenon.

[0043] As shown in the attached Figure 3 and attached Figure 5 figure, in another specific embodiment, an organic water filtration system 1 is further included. The organic water filtration system 1 includes several layers of steel bar structures and permeable filter materials 13. Several layers of steel bar structures are stacked on the outside of the shell pipe system 2 from bottom to top. Each layer of steel bar structure includes several steel bar cages 11 arranged around the shell pipe system 2, and the steel bar cages 11 are filled with permeable filter materials 13. In this way, the monomer compartments are separated through the steel bar mesh 112, and the permeable filter materials 13 are restricted by the monomer compartments to ensure the structural stability.

[0044] In this embodiment, the permeable filter material 13 is construction waste aggregate treated with silicone solution, with good particle size distribution. The treated construction waste aggregate has good water-repellent performance, preventing water from staying in the construction waste aggregate for a long time. While ensuring water permeability, it effectively intercepts and filters the soil. The voids between the construction waste aggregates reserve space for frost heave deformation, reducing the impact of freeze-thaw cycles on the pile structure strength and slope retaining capacity. The permeable filter material 13 can maintain the blocking and filtering effect on the soil while having good water-repellent properties.

[0045] In this embodiment, the organic water filtration system 1 is located at the outermost part of the overall structure, mainly playing the roles of permeable water and filtering soil and avoiding pore blockage. Among them, the steel bar cage 11 is the framework structure of the organic water filtration system 1. The backing plate 12 is located above the bottom surface of the steel bar cage 11, and the permeable filter material 13 is located in the space formed between the steel bar cage 11 and the backing plate 12.

[0046] As shown in the attached Figure 4As shown, in a further embodiment, the steel reinforcement cage 11 includes steel bars 111, steel bar meshes 112 and backing plates 12. The steel bars 111 form an arc-shaped columnar framework. Steel bar meshes 112 are arranged around the perimeter and at the bottom of the arc-shaped columnar framework. A backing plate 12 is laid on the upper end of the steel bar mesh 112 at the bottom. Several steel reinforcement cages 11 can be spliced around to form a circular ring. In this embodiment, the backing plate 12 is arranged on top of the bottom steel bar mesh 112, and its thickness at the far-core end is greater than that at the near-core end. The steel reinforcement cage 11 and the backing plate 12 can be constrained by nuts or ties. The steel bar mesh 112 and the backing plate 12 in the steel reinforcement cage 11 cooperate to constrain the position of the permeable filter material 13. Among them, the steel reinforcement cage 11 can be a double-ring tubular structure, that is, an inner and outer double ring. The steel bars 111 form the main support structure of the steel reinforcement cage 11. A steel bar mesh 112 is arranged in the grid area formed between the steel bars 111. The steel bar mesh 112 and the steel bars 111 are fixed by wire bundling. The cross-section of a single steel bar constraint grid formed by the steel bars 111 and the steel bar mesh 112 is quadrilateral. The backing plate 12 is located on the lower surface of a single steel bar 111 constraint grid. The backing plate 12 is laid on the steel bar mesh 112. Constraint holes are provided in the upper part of the backing plate 12, and the position between the steel bar mesh 112 and the backing plate 12 is fixed by wire.

[0047] Among them, in a further embodiment, the bottom of the steel reinforcement cage 11 is arranged in an inclined posture with the outer side higher and the inner side lower. In this embodiment, except for the single structures at the upper and lower ends of the organic water filtration system 1, the side cross-sections of the middle single structures are all quadrilateral. The above-mentioned backing plate 12 is arranged in the same way as the steel reinforcement cage 11, with the outer side higher and the inner side lower. Among them, the structural arrangement of the steel reinforcement cage 11 and the backing plate 12 with the outer side higher and the inner side lower realizes the self-flow collection of water, improves the water enrichment efficiency, and combines with the good water repellency of the permeable filter material 13 to realize the improvement of the drainage efficiency and the reduction of the probability of frost heave failure.

[0048] As shown in the attached Figure 1 figure, in another specific embodiment, it further includes a longitudinal collector drain pipe 6 and a transverse water delivery pipe 7. The shell pipe system 2 and the core pipe system 3 are jointly arranged on both sides of the channel 4. A longitudinal collector drain pipe 6 arranged along the direction of the channel 4 is laid at the bottom of the channel 4. The longitudinal collector drain pipe 6 is respectively connected to the corresponding drainage riser pipes 34 through the transverse water delivery pipe 7, and the height of the transverse water delivery pipe 7 gradually decreases from the longitudinal collector drain pipe 6 to the drainage riser pipes 34. In this embodiment, combined with the above-mentioned organic water filtration system 1, the periphery of the organic water filtration system 1 is connected to the slope soil body 5 and the channel 4. Among them, the shell pipe system 2 is located between the organic water filtration system 1 and the core pipe system 3, mainly playing the role of slope retaining and water body transfer.

[0049] In this solution, the structures of all parts are closely fitted to achieve mutual connection. The organic water filtration system 1 is located at the outermost part of the overall structure, which is a transparent structure allowing water to pass through freely. The shell tube system 2 is located inside the organic water filtration system 1 and is closely attached to it. Water can flow freely through the water permeable pipe 23 preset inside the shell tube system 2. The core tube system 3 is located inside the shell tube system 2 and is tightly attached to the shell tube system 2 through the water collection contact 32 and the expansion sealing band 31. Water converges into the drainage riser 34 through the water collection contact 32 and the water delivery horizontal pipe 33, facilitating the subsequent unified pumping and drainage work.

[0050] In this solution, the organic water filtration system 1, the shell tube system 2, and the core tube system 3 are designed in a form of detachable structure, reducing the complexity of the construction process and the on-site workload. At the same time, the internal structures of each system are designed in an integrated form, avoiding problems such as reduced structural quality caused by on-site factors such as narrow construction environments and structural assembly.

[0051] It should be noted that terms such as "upper", "lower", "left", "right", "front", and "rear" cited in the utility model are only for the convenience of clear description and do not limit the scope of implementation of the utility model. Changes or adjustments in their relative relationships shall be regarded as within the scope of implementation of the utility model without substantial changes in the technical content.

[0052] The above is only the preferred implementation mode of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions falling within the idea of the utility model belong to the protection scope of the utility model. It should be pointed out that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the utility model should be regarded as within the protection scope of the utility model.

Claims

1. A drainage pile structure, characterized in that: It includes a shell tube system (2) and a core tube system (3). The shell tube system (2) includes a hollow columnar shell wall (22) and several water permeable pipes (23) obliquely penetrating through the shell wall (22). The core tube system (3) includes several layers of water conveyance structures, a drain riser (34), and a pile core (35). A pile core (35) is arranged in the inner cavity of the shell wall (22). A vertical drain riser (34) is arranged at the center of the pile core (35). Several layers of water conveyance structures are also arranged in the pile core (35) at intervals from bottom to top. Each layer of water conveyance structure includes several arc-shaped sheet-like water collection contacts (32) and several water conveyance cross pipes (33). The several water collection contacts (32) are attached to the inner wall of the shell wall (22) and arranged in a ring shape. The end face of each water collection contact (32) close to the shell wall (22) respectively covers and communicates with several water permeable pipes (23). The bottom of the end face far from the shell wall (22) is connected to the drain riser (34) through the water conveyance cross pipe (33).

2. The drainage pile structure according to claim 1, characterized in that: The water conveyance cross pipe (33) is arranged in an inclined posture with the outer side higher and the inner side lower.

3. A drainage pile structure according to claim 1 or 2, characterized in that: The water conveyance cross pipe (33) has an arc-edge fan-shaped structure. The end of the water conveyance cross pipe (33) close to the water collection contact (32) is a wide fan surface that fits the bottom side wall of the water collection contact (32). The end close to the drain riser (34) is a narrow fan surface that fits the outer side wall of the drain riser (34). The side wall of the water conveyance cross pipe (33) is an inwardly concave arc-shaped side surface.

4. A drainage pile structure according to claim 1, characterized in that: The core tube system (3) further includes an expansion sealing belt (31). The expansion sealing belt (31) is arranged at the joint of the water collection contact (32) and the inner wall of the shell wall (22). The expansion sealing belt (31) is arranged around the peripheral side of the port of the water collection contact (32) and is in direct contact with the inner wall of the shell wall (22).

5. A drainage pile structure according to claim 1, characterized in that: The interval distances between adjacent water permeable pipes (23) are the same. The several water permeable pipes (23) are arranged in a matrix pattern, and the water permeable pipes (23) are all arranged in an inclined posture with the outer side higher and the inner side lower.

6. A drainage pile structure according to claim 1, characterized in that: A layer of geotextile layer (21) is also connected to the outside of the shell wall (22) through a water-soluble adhesive layer.

7. A drainage pile structure according to claim 1, characterized in that: It further includes an organic water filtration system (1). The organic water filtration system (1) includes several layers of steel bar structures and water permeable filter materials (13). Several layers of steel bar structures are stacked on the outside of the shell tube system (2) from bottom to top. Each layer of steel bar structure includes several steel bar cages (11) arranged around the shell tube system (2). The steel bar cages (11) are filled with water permeable filter materials (13).

8. A drainage pile structure according to claim 7, characterized in that: The steel bar cage (11) includes steel bars (111), steel bar meshes (112), and cushion plates (12). The steel bars (111) form an arc-shaped columnar frame. Steel bar meshes (112) are arranged around the perimeter and at the bottom of the arc-shaped columnar frame. A cushion plate (12) is laid on the upper end of the steel bar mesh (112) at the bottom. The several steel bar cages (11) can be spliced around to form a circular ring.

9. A drainage pile structure according to claim 7, characterized in that: The bottom of the steel bar cage (11) is arranged in an inclined posture with the outer side higher and the inner side lower.

10. A drainage pile structure according to claim 1, characterized in that: It further includes a longitudinal collecting drain pipe (6) and a transverse water delivery pipe (7). The shell pipe system (2) and the core pipe system (3) are jointly arranged on both sides of the channel (4). The longitudinal collecting drain pipe (6) is laid at the bottom of the channel (4). The longitudinal collecting drain pipe (6) is respectively connected to the corresponding drainage riser pipe (34) through the transverse water delivery pipe (7), and the height of the transverse water delivery pipe (7) is gradually decreased from the longitudinal collecting drain pipe (6) to the drainage riser pipe (34).

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