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CN-121992764-A - Bamboo geocell and manufacturing method thereof

CN121992764ACN 121992764 ACN121992764 ACN 121992764ACN-121992764-A

Abstract

The application relates to the technical field of engineering reinforcement materials, in particular to a bamboo geotechnical cell and a manufacturing method thereof, wherein the bamboo geotechnical cell comprises a three-dimensional net structure formed by connecting a plurality of cell walls at nodes, the three-dimensional net structure forms a plurality of deformable cell spaces for containing filler, the cell walls are flexible composite strips formed by weaving bamboo strips, and the composite strips are arranged to have lattice distributed pores so as to form a hollow grid structure. Compared with the traditional high-molecular cell wall, the hollow grid-type cell wall formed by stitch-knitting and compounding of the thin bamboo strips has the advantages that the structure is light and high in strength, a three-dimensional occlusion interface and a horizontal drainage channel are created for the cell wall, the problems of weak friction and poor drainage function of the high-molecular cell interface are solved, a renewable biomass material is adopted, bamboo is used for replacing plastic, carbon emission can be reduced, natural degradation can be realized, no environmental load is caused after scrapping, and meanwhile, the economic development of a region with abundant bamboo resources and economic lag is pulled.

Inventors

  • YIN CHANGJUN
  • XIE SIYU
  • ZHANG SIQI
  • ZHANG YUXIAO
  • LI ZHUO

Assignees

  • 湘潭大学

Dates

Publication Date
20260508
Application Date
20251124

Claims (10)

  1. 1. A bamboo geocell characterized by comprising a three-dimensional network of cell walls (10) interconnected at nodes (20), the three-dimensional network forming a plurality of deformable cell spaces (100) for receiving a filler (200); Wherein the cell walls (10) are flexible composite strips woven by bamboo strips and are provided with lattice distributed pores (101) to form a hollow grid structure, the cell walls (10) form a network-shaped plane which is not airtight in a macroscopic sense and allows the filler (200) to be embedded into the deformable cell space (100) and water flow in the deformable cell space (100) can pass through, and the deformable cell space (100) is provided with a structure which allows the cell walls (10) to be compressed to be attached or spread to be capable of containing the filler (200); The flexible composite strip comprises at least three layers of bamboo strip layers, a first bamboo strip layer positioned on the middle layer, a second bamboo strip layer positioned on two sides of the middle layer and a third bamboo strip layer positioned on the two sides of the middle layer, wherein the adjacent bamboo strip layers are mutually fixed through adhesive layers (12), each layer of bamboo strip layer is formed by stitch knitting of a plurality of bamboo strips in the direction perpendicular to the texture of each layer of bamboo strip layer through stitching, so that a gap delta is formed between the adjacent bamboo strips, and the bamboo strips of the first bamboo strip layer, the second bamboo strip layer and the bamboo strip of the third bamboo strip layer form a preset included angle in the direction perpendicular to the bamboo strip layer; Under geotechnical grid room expansion state, the bamboo strips in second bamboo strip layer and the third bamboo strip layer follow the hoop extension in flexible grid room space (100) to provide hoop tensile resistance, the bamboo strips in first bamboo strip layer follow the vertical extension in flexible grid room space (100), in order to for second bamboo strip layer and third bamboo strip layer provide vertical support.
  2. 2. The bamboo geocell of claim 1, wherein predetermined gaps δ are formed between the bamboo strips in the bamboo strip layer by the stitching, the bamboo strip layer being formed into a grid structure, the size of the gaps δ being dependent on the characteristic particle size of the filler (200) Designing and satisfying the relation that delta is less than or equal to (1/2-1/3) x Wherein Is the particle size corresponding to 85% by weight of the filler (200) particle distribution curve.
  3. 3. The bamboo geocell of claim 1, wherein the gap δ = 1-5 mm; In the first bamboo strip layer, the average gap delta 1 between the bamboo strips is larger than the average gap delta 2 between the bamboo strips in the second and third bamboo strip layers, so that the arrangement of the bamboo strips in the second and third bamboo strip layers is tighter than that of the first bamboo strip layer, and the hoop tensile resistance is improved.
  4. 4. A bamboo geocell according to any one of claims 1-3, wherein the first thin bamboo strip layer has first strip-shaped gaps distributed along a first direction, the second thin bamboo strip layer and the third thin bamboo strip layer have second strip-shaped gaps distributed along a second direction, and the flexible composite strip formed by compositing the first thin bamboo strip layer, the second thin bamboo strip layer and the third thin bamboo strip layer has lattice-distributed pores (101) formed by overlapping areas of the first strip-shaped gaps and the second strip-shaped gaps, wherein the pores (101) are used for water or vegetation roots in the deformable cell space (100) to pass through and are used for increasing binding force with the filler (200).
  5. 5. The bamboo geocell of any one of claims 1-3, wherein the bamboo strips are green parts outside the bamboo wall, and/or the bamboo strips have a thickness of 1.2+ -0.3 mm, a width of 15+ -3 mm, a length of 2-5 m, a tensile strength of not less than 180MPa, an elastic modulus of not less than 15GPa, and an elongation at break of 1.5-3.0%.
  6. 6. The bamboo geocell of claim 1, wherein the bamboo strips in the first bamboo strip layer are orthogonal to the grain direction of the bamboo strips in the second and third bamboo strip layers.
  7. 7. The bamboo geocell of claim 1, wherein the stitch pitch of the stitch is 30-80 mm, the stitch is 10-20 common twine or nylon fiber with a linear density between 200-500 denier.
  8. 8. The bamboo geocell of claim 1, wherein the adhesive layer (12) comprises an amino resin adhesive layer, the amino resin adhesive layer having an adhesive strength greater than the tensile strength of the bamboo strips and a flexural modulus of 8-12 gpa, matching the mechanical properties of the bamboo strips such that the flexible composite strip formed by adhering multiple bamboo strip layers remains overall flexible; The adhesive layer (12) is arranged as an amino resin thin layer formed between two adjacent bamboo strip layers under the preset pressure of 0.4-0.6 MPa, so that the two adjacent bamboo strip layers form mechanical interlocking and chemical bonding.
  9. 9. The bamboo geocell of claim 1, wherein a plurality of parallel arranged cell walls (10) are connected by nodes (20) along a predetermined direction to form a geocell of a predetermined size, wherein adjacent cell walls (10) are separated by a plurality of nodes (20) to form a plurality of deformable cell spaces (100) to form a three-dimensional mesh structure; Wherein the plurality of nodes (20) are divided into odd rows and even rows, and the plurality of first nodes (21) in the odd rows are staggered with the plurality of second nodes (22) in the even rows, so that the deformable cell space (100) can be compressed to the position where the cell walls (10) are attached or unfolded to the space which can be filled with the filler (200); the node (20) is configured to allow the two connected cell walls (10) to bend upon deformation of the deformable cell space (100) and to provide the two cell walls (10) with a tensile capability of a target strength at the node (20).
  10. 10. The method of manufacturing a bamboo geocell according to any one of claims 1-9, comprising the steps of: S1, cutting Phyllostachys Pubescens into single radial thin bamboo strips with preset sizes, and performing anti-corrosion, insect-proof and drying treatment for later use; S2, arranging the bamboo strips prepared in the step S1 in parallel and weaving the bamboo strips through stitching lines to form bamboo strips for standby, wherein the gap between the adjacent bamboo strips is controlled to be 1-5 mm, and the spacing between the woven stitching lines is controlled to be 30-80 mm; S3, cutting the radial bamboo strips prepared in the step S2 into bamboo strips with the width equal to the height of the cell wall (10) along the direction parallel to the knitting lines to form middle bamboo strips (11), and cutting the bamboo strips prepared in the step S2 into bamboo strips with the width equal to the height of the cell wall (10) along the direction parallel to the bamboo strips to form outer-layer bamboo strips (13); S4, coating amino resin adhesive on the joint surfaces of the middle bamboo strip (11) and the two outer bamboo strips (13), enabling the two outer bamboo strips (13) to clamp the middle bamboo strip (11), and pressurizing and solidifying under the pressure of 0.4-0.6 MPa to form a flexible composite strip with the same height as the cell wall (10); S5, forming a three-dimensional net structure by using HDPE connecting buckles between two adjacent cell walls (10) through ultrasonic welding, and forming a deformable cell space (100) among the cell walls (10); in step S5, the HDPE connectors are divided into odd rows and even rows, and the first HDPE connectors in the odd rows are staggered with the second HDPE connectors in the even rows.

Description

Bamboo geocell and manufacturing method thereof Technical Field The invention relates to the technical field of engineering reinforcement materials, in particular to a bamboo geocell and a manufacturing method thereof. Background The geocell is used as a three-dimensional reticular honeycomb structure, and can obviously improve the bearing capacity of soil, disperse load and restrict lateral deformation by expanding and filling dispersion materials, thereby being widely applied to the foundation reinforcement and protection of projects such as highways, railways, dykes, slopes and the like. To date, this area has been almost dominated by cells made of polymeric materials such as High Density Polyethylene (HDPE). The polymer cell has the advantages of light material, good toughness, chemical corrosion resistance and the like, but the cell wall is a sheet with smooth surface, only a small amount of holes are formed, so that the interface performance is insufficient, the drainage capacity is limited, plant root penetration is also hindered, the organic combination of engineering protection and ecological restoration is difficult to realize, meanwhile, the raw materials are derived from nonrenewable petroleum resources, the carbon footprint of the whole life cycle is higher, the aging risk exists under the long-term irradiation of ultraviolet rays, the degradation is difficult after the waste, the white pollution is possibly caused, and the contradiction exists between the current environment-friendly and sustainable infrastructure construction concept. Although there are attempts to use natural materials such as bamboo and wood on the market, the problems of heavy product, incapability of curling and transportation, and easy damage of nodes exist, and the contradiction between interface engagement and horizontal drainage cannot be solved, so no non-polymer product can form a substantial challenge for the mainstream position of the HDPE cell. Disclosure of Invention Aiming at the technical problems existing in the geocell in the prior art, the first aspect of the invention provides a technical scheme, namely a bamboo geocell, wherein a three-dimensional net structure is formed by connecting a plurality of cell walls at nodes, and the three-dimensional net structure forms a plurality of deformable cell spaces for accommodating filler; Wherein the cell walls are flexible composite strips woven by bamboo strips and are provided with lattice distributed pores to form a hollow grid structure, so that the cell walls form a network-shaped plane which is not airtight in a macroscopic sense and allows filler to be embedded and water flow in the deformable cell space to pass through, and the deformable cell space is provided to allow the cell walls to be compressed to be attached or spread to be capable of containing the filler; The flexible composite strip comprises at least three layers of bamboo strip layers, a first bamboo strip layer positioned on the middle layer, a second bamboo strip layer positioned on two sides of the middle layer and a third bamboo strip layer positioned on two sides of the middle layer, wherein the adjacent bamboo strip layers are mutually fixed through adhesive layers, each layer of bamboo strip layer is formed by stitch knitting of a plurality of bamboo strips in the direction perpendicular to the texture of each layer of bamboo strip layer through a stitch, so that a gap delta is formed between the adjacent bamboo strips, and the bamboo strips of the first bamboo strip layer, the second bamboo strip layer and the bamboo strips of the third bamboo strip layer form a preset included angle in the direction perpendicular to the bamboo strip layers; Under the geotechnical grid room expansion state, the bamboo strips in the second bamboo strip layer and the third bamboo strip layer extend along the annular direction of the deformable grid room space so as to provide annular tensile resistance, and the bamboo strips in the first bamboo strip layer extend along the vertical direction of the deformable grid room space so as to provide vertical support for the second bamboo strip layer and the third bamboo strip layer. Preferably, in the bamboo strip layer, a predetermined gap delta is formed between the bamboo strips through the stitching, so that the bamboo strip layer forms a grid structure, and the size of the gap delta is based on the characteristic particle size of the fillerDesigning and satisfying the relation that delta is less than or equal to (1/2-1/3) xWhereinThe filler particles have a particle size corresponding to 85% by weight of the filler particle distribution curve. Preferably, the gap δ=1 to 5mm; In the first bamboo strip layer, the average gap delta 1 between the bamboo strips is larger than the average gap delta 2 between the bamboo strips in the second and third bamboo strip layers, so that the arrangement of the bamboo strips in the second and third bamboo strip layers is tig