Biomimetic steel bracing system based on fractal characteristics of tetramerous wood-like root system and method of use

Abstract

The present application relates to geotechnical engineering supporting technical field, especially to a kind of bionic steel support group based on four number wood board-like root system fractal characteristics and use method.The bionic steel support group includes several bionic steel pipe supports, several bionic steel pipe support structures are same and sequentially connected along axial direction, and active end is connected on two end portions of several bionic steel pipe supports sequentially connected along axial direction;In deep foundation pit supporting engineering under complex geological conditions and high stress environment, through the engineering transplantation of four number wood root system fractal characteristics, bionic rib plate is introduced on the basis of traditional steel support, and then through bionic steel support group, not only the diameter of main body steel pipe can be reduced, but also the longitudinal compression performance and bending shear resistance of bionic steel support group can be improved;Bionic steel support group is especially suitable for high eccentric load and uneven stratum area, large-span foundation pit and dynamic construction environment, micro-deformation control area.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering support technology, and in particular to a biomimetic steel support assembly based on the fractal characteristics of a four-dimensional plank-shaped root system and its application method. Background Technology

[0002] Deep foundation pit support is a key technical challenge in geotechnical engineering. Especially in complex geological conditions, such as soft soil, high water pressure, soil layer eccentric loading, and adjacent existing buildings and underground pipelines in densely populated urban areas, traditional support structures often face bottleneck problems such as insufficient bending stiffness, stress concentration at nodes, and poor dynamic adaptability. In particular, they are weak in resisting eccentric loading and have difficulty resisting complex strata such as alternating soft and hard layers. Frequent monitoring and adjustment of the stress posture of common steel supports are required. As a representative of buttress root plants in tropical rainforests, the unique fractal characteristics of its trunk posture and buttress root system enable it to withstand huge positive loads and lateral bending shear forces; the buttress root system forms a stress gradient transmission path through fractal gradient structure, which greatly improves shear resistance efficiency.

[0003] To address the aforementioned issues, it is urgent to develop a biomimetic steel support assembly that integrates fractal biomimetic design, based on existing steel supports and combined with biomimetic technology, in order to break through the current technological bottlenecks. Summary of the Invention

[0004] The present invention aims to solve the above problems, thereby providing a biomimetic steel support group based on the fractal characteristics of a four-dimensional wooden root system and its usage method. The biomimetic steel support group can not only reduce the diameter of the main steel pipe, but also improve the longitudinal compressive performance, bending and shear resistance of the biomimetic steel support group. The biomimetic steel support group is suitable for areas with high eccentric load and uneven strata, large-span foundation pits and dynamic construction environments, and micro-deformation control zones.

[0005] The technical solution adopted by the present invention to solve the aforementioned problem is as follows: A biomimetic steel support assembly based on the fractal characteristics of a four-segment wooden root system is disclosed. The assembly comprises several biomimetic steel pipe supports, all structurally identical and sequentially connected axially. Each support has a flexible end attached to both ends. Each support includes a cylindrical main steel pipe with circular flanges at both ends, the diameter of which is larger than that of the main pipe. Several biomimetic ribs are evenly distributed around the outer wall of the main pipe, each rib including a primary main rib, which is vertically fixed. On the outer wall of the main steel pipe, the two ends of the primary main rib are fixed to the opposite sides of two circular flange plates. Several secondary main ribs are spaced apart between the two ends of adjacent primary main ribs. The secondary main ribs are vertically fixed on the outer wall of the main steel pipe, and the two ends of the secondary main ribs are fixed to the opposite sides of two adjacent primary main ribs. Several limiting plates are arranged around the middle of the main steel pipe. The limiting plates are arranged in a wave-like continuous pattern around the outer wall of the main steel pipe. The limiting plates are all inclined, and one end of the limiting plate is fixed to the primary main rib, and the other end is fixed to the center line of two adjacent primary main ribs.

[0006] Furthermore, the circular flanges on the adjacent bionic steel pipe supports are joined together and fastened with bolts, and the movable end is fixed to the circular flange of the bionic steel pipe support with bolts.

[0007] Furthermore, the flexible end includes a cylindrical outer sleeve, with a circular flange plate fixedly connected to one end of the outer sleeve. The circular flange plate of the outer sleeve is mated with a circular flange plate supported by a biomimetic steel pipe and fastened by a bolt group. An installation hole is provided at the other end of the outer sleeve, and an inner sleeve is slidably installed in the installation hole. An annular support plate fixed to the end face of the outer sleeve is slidably fitted on the inner sleeve. The diameters of the circular flange plate and the annular support plate are both larger than the diameter of the outer sleeve. Several biomimetic plates are provided on the outer wall of the outer sleeve, and the several biomimetic plates are evenly arranged around the outer wall of the outer sleeve. The inner sleeve is shaped like a frustum cylinder, narrow at the top and wide at the bottom. An end support plate is fixedly connected to the bottom of the inner sleeve. Several trapezoidal ribs are provided on the outer wall of the inner sleeve, and the several trapezoidal ribs are evenly arranged around the outer wall of the inner sleeve. Several limiting wedges are provided between the outer sleeve and the inner sleeve, abutting against the trapezoidal ribs.

[0008] Furthermore, the biomimetic plate includes a first rib, which is vertically fixed to the outer wall of the outer sleeve. The two ends of the first rib are fixed to the opposite sides of the circular flange and the annular support plate. Several second ribs are spaced apart between adjacent first ribs. The second ribs are vertically fixed to the outer wall of the outer sleeve, and the two ends of the second ribs are fixed to the opposite sides of two adjacent first ribs.

[0009] Furthermore, a rectangular opening is provided at the upper end of each trapezoidal rib, and the rectangular opening is located on the side close to the inner sleeve. The limiting wedge is located at the rectangular opening and inserted between the outer sleeve and the inner sleeve.

[0010] Furthermore, the axes of the main steel pipe, outer sleeve, and inner sleeve are all on the same axis, and the centers of the circular flange plate, annular support plate, and end support plate are all on the same axis of the main steel pipe, outer sleeve, and inner sleeve.

[0011] Furthermore, both the primary main rib and the first rib plate are in the shape of long strips, and arc-shaped segments are provided at both ends of the upper side of the primary main rib and at the end of the upper side of the first rib plate near the circular flange plate. The height of the arc-shaped segments gradually increases from the side near the center of the primary main rib and the first main rib to the other side.

[0012] Furthermore, the secondary main rib and the second rib plate have the same structure and are both triangular in shape, and the lower bottom edge and the upper long edge of the secondary main rib and the second rib plate are both arc-shaped.

[0013] Furthermore, the angles between the intersection lines of the secondary main rib, the primary main rib, the second rib plate, and the first rib plate and the cross section are all acute angles, and the size of the angles increases with the increase of the distance between the main steel pipe and the two ends of the outer sleeve; the angles between the intersection lines of the secondary main rib and the outer wall of the main steel pipe, and the intersection lines of the second rib plate and the outer wall of the outer sleeve and the axis are all acute angles, and the size of the angles decreases with the increase of the distance between the main steel pipe and the two ends of the outer sleeve.

[0014] A method for using a biomimetic steel support assembly based on the fractal characteristics of a four-dimensional plank-like root system includes the following steps: S1. Based on the current status of the construction pit, analyze the geological conditions of the pit to determine the axial force and eccentric load angle of the support; S2. Based on the parameters of construction design, support axial force, and eccentric load angle, adjust the quantity and specifications of each component on the biomimetic steel support assembly to meet actual construction needs. S3. Connect several biomimetic steel pipe supports in sequence along the axial direction in the foundation pit, and then install two movable ends, and ensure that the axes of several biomimetic steel pipe supports and two movable ends are on the same axis, thereby completing the initial installation of the biomimetic steel support group. S4. Then, prestress is applied to the biomimetic steel support group to complete the construction of the biomimetic steel support group. S5. Continuously monitor and adjust the bionic steel support group in the foundation pit until the foundation pit construction is completed. The bionic steel support group can be removed after the foundation pit construction is completed.

[0015] The present invention, which adopts the above technical solution, has the following prominent features compared with the prior art: This invention relates to deep foundation pit support engineering under complex geological conditions and high stress environments. By transplanting the fractal characteristics of the root system of a four-tree species, it introduces biomimetic ribs into traditional steel supports. This biomimetic steel support assembly not only reduces the diameter of the main steel pipe but also improves its longitudinal compressive strength, bending and shear resistance. The biomimetic steel support assembly is particularly suitable for areas with high eccentric loading and uneven geological formations, large-span foundation pits and dynamic construction environments, and micro-deformation control zones, such as urban core areas or areas subjected to excavator vibration and blasting impact. The dynamic load of temporary surcharges improves the stability of deep foundation pit support and enhances the safety of deep foundation pit construction. At the same time, the biomimetic steel support group can replace the traditional steel support and be applied to deep foundation pit support projects under complex geological conditions and high stress environments. It has extremely high bending and shear resistance to cope with eccentric pressure. In addition, the biomimetic ribs on the biomimetic steel pipe support and the biomimetic plates on the movable ends can significantly improve the bending and shear resistance and longitudinal bearing efficiency of the biomimetic steel pipe support and the movable ends by forming a multi-level force transmission path through auxiliary compression resistance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the biomimetic steel pipe support and flexible end connection structure of the present invention; Figure 2 This is a schematic diagram of the biomimetic rib structure of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the biomimetic rib structure of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the structure of the limiting plate of the present invention; Figure 5 This is a schematic diagram of the structure of the flexible end of the present invention; In the diagram: 1. Bionic steel pipe support; 2. Flexible end; 3. Main steel pipe; 4. Circular flange plate; 5. Bionic rib plate; 6. Primary main rib; 7. Secondary main rib; 8. Limiting plate; 9. Outer sleeve; 10. Inner sleeve; 11. Annular support plate; 12. Bionic plate body; 13. End support plate; 14. Trapezoidal rib plate; 15. First rib plate; 16. Second rib plate; 17. Rectangular opening; 18. Arc segment; 19. Bolt hole. Detailed Implementation

[0017] The following description of the embodiments will help the public better understand the present invention. However, the specific embodiments provided by the applicant should not and should not be regarded as a limitation on the technical solution of the present invention. Any changes to the definition of components or technical features and / or formal but not substantive changes to the overall structure should be regarded as the scope of protection defined by the technical solution of the present invention.

[0018] See Figures 1 to 5As shown, the technical solution of the present invention is as follows: A biomimetic steel support group based on the fractal characteristics of a four-segment wooden root system, the biomimetic steel support group includes several biomimetic steel pipe supports 1, the several biomimetic steel pipe supports 1 have the same structure and are connected sequentially along the axial direction, and each of the several biomimetic steel pipe supports 1 connected sequentially along the axial direction has a flexible end 2 connected to both ends, wherein the number of biomimetic steel pipe supports 1 is determined according to the construction requirements of the foundation pit. The biomimetic steel pipe support 1 includes a cylindrical main steel pipe 3, which is the core longitudinal load-bearing component and is closed at both ends. Circular flange plates 4 are connected to both ends of the main steel pipe 3. A number of bolt holes 19 are continuously and evenly opened on the circular flange plates 4 along the circumference. The number and diameter of the bolt holes 19 are determined according to the design requirements. The diameter of the circular flange plate 4 is larger than the diameter of the main steel pipe 3. A number of biomimetic ribs 5 are fixed on the outer wall of the main steel pipe 3. The number of biomimetic ribs 5 are distributed in a fractal gradient along the axial direction of the main steel pipe 3. The number and specifications of the biomimetic ribs 5 are adjusted at any time according to the construction requirements and design requirements of the foundation pit. The number of biomimetic ribs 5 are evenly arranged around the outer wall of the main steel pipe 3. The biomimetic rib plate 5 includes a primary main rib 6, which is vertically fixed to the outer wall of the main steel pipe 3. The primary main rib 6 is set along the entire length of the main steel pipe 3, and its two ends are fixed to the opposite sides of two circular flange plates 4. The primary main rib 6 is long and narrow, and arc-shaped segments 18 are provided at both ends of the upper side of the primary main rib 6 near the circular flange plates 4. The height of the arc-shaped segments 18 gradually increases from the side closest to the center of the primary main rib 6 to the other side. The arc-shaped segments 18 enhance the shear resistance of the ends of the primary main rib 6 and improve the overall stability of the biomimetic steel pipe support 1. The primary main rib 6 serves as an auxiliary longitudinal load-bearing structure and a core bending and shear resistance structure. The thickness of the primary main rib 6 can be dynamically adjusted, that is, the thickness of the portion of the primary main rib 6 closest to the circular flange plates 4 is greater as it is closer to the circular flange plates 4. Several secondary main ribs 7 are spaced apart between the two ends of adjacent primary main ribs 6. The secondary main ribs 7 serve as... The load-bearing path component transfers the longitudinal load to the main steel pipe 3. The thickness of the secondary main rib 7 can be dynamically adjusted, meaning that the thickness of the secondary main rib 7 increases as it gets closer to the primary main rib 6. The number and specifications of the secondary main rib 7 can be adjusted at any time according to the construction and design requirements of the foundation pit. The secondary main rib 7 is vertically fixed to the outer wall of the main steel pipe 3. The two ends of the secondary main rib 7 are fixed to the opposite sides of two adjacent primary main ribs 6. The secondary main rib 7 is triangular in shape, with its lower base and upper long side both being arc-shaped. In addition, the angle between the intersection line of the secondary main rib 7 and the primary main rib 6 and the cross section is acute, ranging from 35° to 70°, and the angle increases with the distance between the secondary main rib 7 and the two ends of the main steel pipe 3. The angle between the intersection line of the secondary main rib 7 and the outer wall of the main steel pipe 3 and the axis is acute, ranging from 25° to 50°, and the angle decreases with the distance between the secondary main rib 7 and the two ends of the main steel pipe 3. Several limiting plates 8 are enclosed in the middle of the main steel pipe 3. The limiting plates 8 serve as energy-absorbing structures to improve the bending and shear resistance of the bionic steel pipe support 1. The limiting plates 8 are arranged in a wave-like continuous manner around the outer wall of the main steel pipe 3. The limiting plates 8 are all inclined, and one end of the limiting plate 8 is fixed on the primary main rib 6, and the other end is fixed on the center line of two adjacent primary main ribs 6. The number of limiting plates 8 is dynamically adjusted according to the number of primary main ribs 6.

[0019] The circular flange plates 4 on the adjacent bionic steel pipe support 1 are connected and fastened by bolts. The movable end 2 is fixed to the circular flange plate 4 of the bionic steel pipe support 1 by bolts, thus assembling a complete bionic steel support assembly.

[0020] The movable end 2 includes a cylindrical outer sleeve 9. A circular flange 4 is fixedly connected to one end of the outer sleeve 9. The circular flange 4 on the outer sleeve 9 has the same structure as the circular flange 4 on the bionic steel pipe support 1. The circular flange 4 of the outer sleeve 9 and the circular flange 4 of the bionic steel pipe support 1 are mated and fastened by bolts. An installation hole is opened at the other end of the outer sleeve 9, and an inner sleeve 10 is slidably installed in the installation hole. An annular support plate 11 is slidably fitted on the inner sleeve 10. The annular support plate 11 is fixed to the end face of the outer sleeve 9. The diameters of the circular flange 4 and the annular support plate 11 are both larger than the diameter of the outer sleeve 9. Several bionic plates 12 are fixed on the outer wall of the outer sleeve 9. The number and specifications of the bionic plates 12 are determined according to the construction requirements and design requirements of the foundation pit. The inner sleeve 10 is shaped like a frustum cylinder, narrow at the top and wide at the bottom. An end support plate 13 is fixedly connected to the bottom of the inner sleeve 10. The end support plate 13 is rectangular. Several trapezoidal ribs 14 are fixedly connected to the outer wall of the inner sleeve 10. The number and specifications of the trapezoidal ribs 14 are adjusted at any time according to the construction requirements and design requirements of the foundation pit. Several trapezoidal ribs 14 are evenly arranged around the outer wall of the inner sleeve 10. Several limiting wedges are inserted between the outer sleeve 9 and the inner sleeve 10. The number of limiting wedges is consistent with the number of trapezoidal ribs 14. A rectangular opening 17 is opened at the upper end of each trapezoidal rib 14. The rectangular opening 17 is located on the side close to the inner sleeve 10. The limiting wedges abut against the rectangular opening 17.

[0021] The biomimetic plate 12 includes a first rib 15, which is vertically fixed to the outer wall of the outer sleeve 9. The two ends of the first rib 15 are fixed to the opposing sides of the circular flange plate 4 and the annular support plate 11. The first rib 15 is elongated, with an arc-shaped segment 18 at one end of its upper side near the circular flange plate 4. The height of the arc-shaped segment 18 gradually increases from the side closest to the center of the first main rib to the other side. The thickness of the first rib 15 can be dynamically adjusted; that is, the closer the two ends of the first rib 15 are to the circular flange plate 4 and the annular support plate 11, the thicker it is. Several second ribs 16 are fixed at intervals between adjacent first ribs 15. The number and specifications of the second ribs 16 are adjusted according to the construction and design requirements of the foundation pit. The thickness of 16 can be dynamically adjusted. That is, the closer the two ends of the second rib 16 are to the first rib 15, the thicker the thickness. The second rib 16 is vertically fixed to the outer wall of the outer sleeve 9. The two ends of the second rib 16 are fixed to the opposite sides of two adjacent first ribs 15. The second rib 16 is triangular in shape, and the lower base and upper long side of the second rib 16 are both arc-shaped. In addition, the angle between the intersection line of the second rib 16 and the first rib 15 and the cross section is an acute angle, with an angle of 35°-70°. The size of the angle increases with the increase of the distance between the second rib 16 and the two ends of the outer sleeve 9. The angle between the intersection line of the second rib 16 and the outer wall of the outer sleeve 9 and the axis is an acute angle, with an angle of 25°-50°. The size of the angle decreases with the increase of the distance between the second rib 16 and the two ends of the outer sleeve 9.

[0022] The axes of the main steel pipe 3, the outer sleeve 9, and the inner sleeve 10 are all on the same axis, and the centers of the circular flange plate 4, the annular support plate 11, and the end support plate 13 are all on the same axis of the main steel pipe 3, the outer sleeve 9, and the inner sleeve 10.

[0023] A method for using a biomimetic steel support assembly based on the fractal characteristics of a four-dimensional plank-like root system includes the following steps: S1. Based on the current status of the construction pit, analyze the geological conditions of the pit to determine the axial force and eccentric load angle of the support; S2. Based on the parameters of construction design, support axial force, and eccentric load angle, adjust the quantity and specifications of each component on the biomimetic steel support assembly to meet actual construction needs. S3. Connect several biomimetic steel pipe supports 1 in sequence along the axial direction in the foundation pit, and then install two movable ends 2, and ensure that the axes of several biomimetic steel pipe supports 1 and two movable ends 2 are on the same axis, thereby completing the initial installation of the biomimetic steel support group. S4. Then, prestress is applied to the biomimetic steel support group to complete the construction of the biomimetic steel support group. S5. Continuously monitor and adjust the bionic steel support group in the foundation pit until the foundation pit construction is completed. The bionic steel support group can be removed after the foundation pit construction is completed.

[0024] This invention relates to deep foundation pit support engineering under complex geological conditions and high stress environments. By transplanting the fractal characteristics of the root system of a four-tree species, it introduces biomimetic ribs 5 onto the traditional steel support. This biomimetic steel support assembly not only reduces the diameter of the main steel pipe 3 but also improves the longitudinal compressive strength, bending and shear resistance of the assembly. The biomimetic steel support assembly is particularly suitable for areas with high eccentric loading and uneven strata, large-span foundation pits and dynamic construction environments, and micro-deformation control zones, such as urban core areas or areas subjected to excavator vibration, blasting impact, and temporary... The dynamic load of the surcharge improves the stability of deep foundation pit support and enhances the safety of deep foundation pit construction. At the same time, the biomimetic steel support group can replace the traditional steel support and be applied to deep foundation pit support projects under complex geological conditions and high stress environments. It has extremely high bending and shear resistance to cope with eccentric pressure. In addition, the biomimetic ribs 5 on the biomimetic steel pipe support 1 and the biomimetic plate 12 on the movable end 2 can significantly improve the bending and shear resistance and longitudinal bearing efficiency of the biomimetic steel pipe support 1 and the movable end 2 by forming a multi-level force transmission path through auxiliary compression resistance.

[0025] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A biomimetic steel support assembly based on the fractal characteristics of a four-dimensional plank-like root system, characterized in that: The biomimetic steel support assembly comprises several biomimetic steel pipe supports, which are structurally identical and connected sequentially along the axial direction. Each of the sequentially connected biomimetic steel pipe supports has a movable end attached to both ends. Each biomimetic steel pipe support includes a cylindrical main steel pipe with circular flanges at both ends. The diameter of the circular flanges is larger than the diameter of the main steel pipe. Several biomimetic ribs are evenly distributed around the outer wall of the main steel pipe, and each biomimetic rib includes a primary main rib, which is vertically fixed to the outer wall of the main steel pipe. The two ends of the primary main rib are fixed to the opposite sides of two circular flange plates. Several secondary main ribs are spaced apart between the two ends of adjacent primary main ribs. The secondary main ribs are vertically fixed to the outer wall of the main steel pipe. The two ends of the secondary main ribs are fixed to the opposite sides of two adjacent primary main ribs. Several limiting plates are arranged around the middle of the main steel pipe. The limiting plates are arranged in a wave-like continuous pattern around the outer wall of the main steel pipe. The limiting plates are all inclined. One end of the limiting plate is fixed to the primary main rib, and the other end is fixed to the center line of two adjacent primary main ribs. The flexible end includes a cylindrical outer tube, with a circular flange plate fixedly connected to one end of the outer tube, and several biomimetic plates are provided on the outer wall surface of the outer tube; the biomimetic plate includes a first rib plate, which is vertically fixed on the outer wall surface of the outer tube, and several second rib plates are provided at intervals between adjacent first rib plates, which are vertically fixed on the outer wall surface of the outer tube. Both the primary main rib and the first rib plate are long strips. Arc-shaped segments are provided at both ends of the upper side of the primary main rib and at the end of the upper side of the first rib plate near the circular flange plate. The height of the arc-shaped segments gradually increases from the side near the center of the primary main rib and the first main rib to the other side. The secondary main rib and the second rib plate have the same structure and are both triangular in shape. The bottom edge and the upper long edge of the secondary main rib and the second rib plate are both arc-shaped. The angles between the intersection lines of the secondary main rib, the primary main rib, the second rib plate, and the first rib plate and the cross section are all acute angles, and the size of the angles increases with the increase of the distance between the main steel pipe and the two ends of the outer sleeve; the angles between the intersection lines of the secondary main rib and the outer wall of the main steel pipe, and the intersection lines of the second rib plate and the outer wall of the outer sleeve and the axis are all acute angles, and the size of the angles decreases with the increase of the distance between the main steel pipe and the two ends of the outer sleeve.

2. The biomimetic steel support assembly based on the fractal characteristics of a four-dimensional plank-like root system according to claim 1, characterized in that: The circular flanges on adjacent bionic steel pipe supports are joined together and fastened with bolts, and the movable end is fixed to the circular flange of the bionic steel pipe support with bolts.

3. The biomimetic steel support assembly based on the fractal characteristics of a four-dimensional plank-like root system according to claim 2, characterized in that: The circular flange of the outer sleeve is connected to the circular flange of the bionic steel pipe support and fastened by bolts. An installation hole is provided at the other end of the outer sleeve, and the inner sleeve is slidably installed in the installation hole. An annular support plate fixed to the end face of the outer sleeve is slidably fitted on the inner sleeve. The diameters of the circular flange and the annular support plate are both larger than the diameter of the outer sleeve. Several bionic plates are evenly arranged around the outer wall of the outer sleeve. The inner sleeve is shaped like a frustum cylinder, narrow at the top and wide at the bottom. An end support plate is fixedly connected to the bottom of the inner sleeve. Several trapezoidal ribs are provided on the outer wall of the inner sleeve. Several limiting wedges are provided between the outer sleeve and the inner sleeve, abutting against the trapezoidal ribs.

4. The biomimetic steel support assembly based on the fractal characteristics of a four-dimensional plank-like root system according to claim 3, characterized in that: The two ends of the first rib are fixed to the opposite sides of the circular flange and the annular support plate, and the two ends of the second rib are fixed to the opposite sides of two adjacent first ribs.

5. The biomimetic steel support assembly based on the fractal characteristics of a four-dimensional plank-like root system according to claim 3, characterized in that: A rectangular opening is provided at the upper end of each trapezoidal rib, and the rectangular opening is located on the side closer to the inner sleeve. The limiting wedge is located at the rectangular opening and inserted between the outer sleeve and the inner sleeve.

6. The biomimetic steel support assembly based on the fractal characteristics of a four-dimensional plank-like root system according to claim 3, characterized in that: The axes of the main steel pipe, outer sleeve, and inner sleeve are all on the same axis, and the centers of the circular flange plate, annular support plate, and end support plate are all on the same axis of the main steel pipe, outer sleeve, and inner sleeve.

7. A method of using a biomimetic steel support assembly based on the fractal characteristics of a four-dimensional plank-like root system according to any one of claims 1-6, characterized in that: Includes the following steps: S1. Based on the current status of the construction pit, analyze the geological conditions of the pit to determine the axial force and eccentric load angle of the support; S2. Based on the parameters of construction design, support axial force, and eccentric load angle, adjust the quantity and specifications of each component on the biomimetic steel support assembly to meet actual construction needs. S3. Connect several biomimetic steel pipe supports in sequence along the axial direction in the foundation pit, and then install two movable ends, and ensure that the axes of several biomimetic steel pipe supports and two movable ends are on the same axis, thereby completing the initial installation of the biomimetic steel support group. S4. Then, prestress is applied to the biomimetic steel support group to complete the construction of the biomimetic steel support group. S5. Continuously monitor and adjust the bionic steel support group in the foundation pit until the foundation pit construction is completed. The bionic steel support group can be removed after the foundation pit construction is completed.

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