Pipeline protection structure of prestressed double-layer anchoring geocell and construction method

Abstract

The invention provides a pipeline protection structure of a prestressed double-layer anchoring earthwork standard room and a construction method. The pipeline protection structure of the prestressed double-layer anchoring earthwork standard room comprises a foundation treatment layer, a graded broken stone layer, a pipeline layer, a lower-layer earthwork standard room, a bagged soil layer and an upper-layer earthwork standard room which are sequentially arranged from bottom to top. Compacted original soil is arranged between the pipeline layer and the lower-layer earthwork standard room, and compacted original soil is arranged between the upper-layer earthwork standard room and the ground surface. The pipeline layer is provided with a plurality of soil engineering bags which are arranged in a stacked mode, the multiple soil engineering bags are located on the left side face and the right side face of the buried pipeline correspondingly, and rubber mixed soil is arranged in the soil engineering bags. According to the pipeline protection structure of the prestress double-layer anchoring earthwork standard room, step-by-step buffering and dispersing of loads are achieved through the layered design, the continuous influence caused by traffic circulation loads is relieved, and the risks of stress concentration, differential settlement and pipeline stress deformation of soil around the pipeline are remarkably reduced.

Description

Technical Field

[0001] This application belongs to the field of geosynthetic reinforced pipeline protection technology, specifically relating to a pipeline protection structure and construction method of a prestressed double-layer anchored geocell. Background Technology

[0002] As a core component of urban infrastructure, the safe operation of water supply and drainage pipelines is directly related to the stability of public facilities and residents' lives. However, pipelines buried under roads are subjected to the cyclical effects of ground traffic loads for a long time, which can easily lead to stress concentration in the surrounding soil, uneven settlement, and pipeline deformation, thereby causing structural damage or functional failure of the pipeline.

[0003] Currently, the main pipeline protection methods in the industry are increasing the burial depth of pipelines or reinforcing them with concrete. While increasing the burial depth can reduce the transmission of surface loads to some extent, it requires deeper excavation, resulting in long construction periods, large project volumes, and the risk of damaging surrounding underground pipelines and structures. It also has poor adaptability to construction in urban core areas. Concrete reinforcement uses a rigid structure to resist load impacts, but it suffers from high costs and significant self-weight, which increases the bearing capacity of the foundation. Furthermore, rigid materials are difficult to adapt to minor soil deformations, making them prone to secondary cracking, and maintenance and dismantling are difficult and costly. Neither of these solutions can fundamentally solve the continuous impact of traffic circulation loads, and their protective effectiveness needs improvement. Summary of the Invention

[0004] This application provides a pipeline protection structure and construction method for a prestressed double-layer anchored geocell, aiming to solve the problems in the prior art where pipelines need protection, but traditional pipeline protection methods are costly, labor-intensive, and have poor protection effects.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: In one aspect, a pipe protection structure for a prestressed double-layer anchored geocell is provided, comprising a foundation treatment layer, a graded crushed stone layer, a pipe layer, a lower geocell, a bagged soil layer, and an upper geocell arranged sequentially from bottom to top. Among them, there is compacted original soil between the pipeline layer and the lower geocell, and between the upper geocell and the ground surface; The lower geocell and the upper geocell are connected; The pipeline layer has multiple stacked geotextile bags, which are located on the left and right sides of the buried pipeline, respectively, and each geotextile bag contains rubber-mixed soil.

[0006] In conjunction with the first aspect, in one possible implementation, the rubber-mixed soil fills the geotextile bag, the rubber-mixed soil being a mixture of sand, gravel and rubber particles, wherein the mass fraction of the rubber particles is 10% to 20%.

[0007] In conjunction with the first aspect, in one possible implementation, the upper geocell is provided with a first buckle at each of its four apex corners, and the lower geocell is provided with a second buckle at each of its four apex corners corresponding to the first buckle. An anchor rod is provided between the upper geocell and the lower geocell, and the upper and lower ends of the anchor rod are respectively engaged with the first buckle and the corresponding second buckle.

[0008] In conjunction with the first aspect, in one possible implementation, nuts are screwed onto both ends of the anchor bolt; The first buckle includes: A fixing plate is installed at the top corner of the upper geocell; and The docking plate is connected to the fixed plate and forms a ring structure. The inner ring of the fixed plate and the inner ring of the docking plate abut against the anchor rod, and the top of the fixed plate and the docking plate abut against the corresponding nut. The two nuts on the same anchor rod are fitted together to clamp the upper geocell and the lower geocell.

[0009] In conjunction with the first aspect, in one possible implementation, the strip material of both the lower geocell and the upper geocell is high-density polyethylene.

[0010] In conjunction with the first aspect, in one possible implementation, the outer periphery of the upper geocell is provided with a plurality of first anchor cables, which are used to apply prestress to the upper geocell in the direction of the soil on both sides; on the four sides of the upper geocell, the plurality of first anchor cables on one pair of sides are perpendicular to the axial direction of the buried pipeline and gradually tilt outward from top to bottom, and the plurality of first anchor cables on the other two sides are perpendicular to the radial direction of the buried pipeline. The lower geocell is provided with a plurality of second anchor cables on its outer periphery. The plurality of second anchor cables are used to apply prestress to the lower geocell in the direction of the soil on both sides. On one pair of the four sides of the lower geocell, the plurality of second anchor cables are perpendicular to the axial direction of the buried pipeline and gradually tilt outward from top to bottom. The plurality of second anchor cables on the other two sides of the lower geocell are perpendicular to the radial direction of the buried pipeline.

[0011] In conjunction with the first aspect, in one possible implementation, the bagged soil layer includes: Multiple stacked soil bags, each filled with on-site soil.

[0012] The prestressed double-layer anchored geocell pipeline protection structure provided in this application, compared with existing technologies, balances elasticity and stiffness. The rubber-mixed soil in the geocells can adapt to minor soil deformations. The synergistic effect of the upper and lower geocells and the compacted original soil can delay the development of shear failure surfaces, improve the overall stiffness of the pipe-soil system, and reduce cumulative settlement caused by repeated vehicle compaction. The integrated layered design achieves progressive load buffering and dispersion, mitigating the continuous impact of traffic cyclic loads and significantly reducing the risks of stress concentration, uneven settlement, and pipeline deformation in the surrounding soil. This structure eliminates the need for increased excavation depth, shortening the construction period.

[0013] Secondly, a construction method is provided for manufacturing a pipe protection structure of a prestressed double-layer anchored geocell as described in any of the possible implementations above, comprising the following steps: S1: Processing foundation treatment layer; S2: A graded crushed stone layer is laid on the foundation treatment layer to form a drainage layer; S3: Lay a buried pipeline on the graded crushed stone layer and stack geotextile bags on both sides of the buried pipeline; S4: Lay compacted original soil on top of the geotextile bag and the buried pipeline, and install the lower geocell on top of the compacted original soil; S5: Lay a layer of bagged soil on top of the lower geocell, and install the upper geocell on top of the bagged soil layer; S6: Lay and compact the original soil on top of the upper geocell, and construct the road surface after the paving is completed.

[0014] In conjunction with the second aspect, in one possible implementation, step S5 further includes: The lower geocell is connected to the upper geocell.

[0015] In conjunction with the second aspect, in one possible implementation, the height of the upper geocell is 100mm~150mm; The height of the lower geocell is 100mm~150mm; The height of the bagged soil layer is 500mm~1000mm.

[0016] The construction method provided in this application has the following advantages compared with the prior art: (1) This structure balances elasticity and stiffness. The rubber-mixed soil in the geocells can adapt to minor soil deformations. The synergistic effect of the upper and lower geocells and the compacted original soil can delay the development of shear failure surfaces, improve the overall stiffness of the pipe-soil system, and reduce cumulative settlement caused by repeated vehicle compaction. The integrated layered design achieves gradual buffering and dispersion of loads, alleviates the continuous impact of traffic cycle loads, and significantly reduces the risk of stress concentration, uneven settlement, and pipe deformation in the surrounding soil. This structure does not require deepening the excavation depth, which can shorten the construction period.

[0017] (2) Steps S1-S2 first complete the foundation and drainage system construction to provide a stable foundation for subsequent structures and avoid later settlement caused by uneven foundation or poor drainage; Step S3 sets up geotextile bags to achieve precise construction of lateral protection for pipelines; Steps S4-S5 level the original soil by compacting it and laying geocells and bagged soil layers in layers to ensure that each structural layer is fully bonded and improve the continuity of stress; Step S6 completes the top protection and road construction to form a complete load transfer path. This process does not require complex equipment or special processes, is convenient and efficient to construct, does not require deepening the excavation depth, and causes minimal damage to surrounding underground pipelines and structures, greatly improving the adaptability of construction in urban core areas. Layered construction facilitates process quality control and allows for timely adjustment of the laying thickness and compaction degree of each structural layer to ensure compliance with design requirements; it not only reduces construction difficulty and engineering costs, but also ensures the construction quality of the protective structure and ensures its long-term stable protective function, making it suitable for large-scale municipal pipeline renovation, pipeline laying in traffic load areas and other engineering scenarios. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 Schematic diagram of the pipe protection structure of the prestressed double-layer anchored geocell provided in the embodiments of this application. Figure 1 ; Figure 2 This is a schematic diagram of the pipe protection structure of the prestressed double-layer anchored geocell used in the embodiments of this application. Figure 2 ; Figure 3 This is a schematic diagram of the structure of the first buckle used in the embodiments of this application; Figure 4 This is a top view of the assembly of the first buckle and anchor rod used in the embodiments of this application.

[0020] Explanation of reference numerals in the attached figures: 1. Graded crushed stone layer; 2. Pipeline layer; 21. Buried pipeline; 22. Geotextile bag; 3. Lower geocell; 31. Second clip; 32. Second anchor cable; 4. Bagged soil layer; 5. Upper geocell; 51. First clip; 511. Fixing plate; 512. Connecting plate; 52. First anchor cable; 6. Compact the original soil; 7. Anchor bolt; 71. Nut. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is actually illustrative only and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0024] It should be noted that the terms "length," "width," "height," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0025] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Additionally, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0027] Please refer to the following: Figures 1 to 4 The pipeline protection structure and construction method of the prestressed double-layer anchored geocell provided in this application are described below. The pipeline protection structure of the prestressed double-layer anchored geocell includes, from bottom to top, a foundation treatment layer, a graded crushed stone layer 1, a pipeline layer 2, a lower geocell 3, a bagged soil layer 4, and an upper geocell 5; wherein, there is compacted original soil 6 between the pipeline layer 2 and the lower geocell 3, and between the upper geocell 5 and the ground surface; the lower geocell 3 and the upper geocell 5 are connected; the pipeline layer 2 has multiple stacked geocells 22, which are located on the left and right sides of the buried pipeline 21, and the geocells 22 contain rubber-mixed soil.

[0028] It should be noted that the ground surface bears the traffic load. The traffic load is diffused onto the upper geocell 5 through the compacted original soil 6 below the ground surface. The prestress of the upper geocell 5 effectively reduces the effect of the traffic load. When the traffic load is transferred to the bagged soil layer 4, the soil further diffuses the stress to the surrounding area, reducing the concentrated effect of the traffic load, thereby further reducing the overall load transferred to the lower geocell 3. The prestress of the lower geocell 3 reduces the transmitted traffic load, thereby reducing the load above the buried pipeline 21 and achieving the effect of protecting the buried pipeline 21.

[0029] In practical implementation, this protective structure constructs an integrated protection system for drainage, buffering, and stress dispersion through layered collaborative design. The foundation treatment layer provides a stable bearing base for the overall structure. The graded crushed stone layer 1 achieves efficient drainage by leveraging the advantages of particle gradation, avoiding stress concentration caused by water softening of the soil around the buried pipeline 21. The geotextile bags 22 on both sides of the pipeline utilize the elastic deformation characteristics of rubber-mixed soil to absorb the impact energy brought by traffic loads, reducing the impact force of traffic loads directly acting on the sidewalls of the pipeline. The upper geocell 5 and the lower geocell 3 restrict the lateral displacement of the soil through lateral constraint effects, transforming concentrated loads into uniformly distributed surface loads. Combined with the secondary stress diffusion of the grid layer 6 and the geotextile composite layer, the vertical pressure transmitted to the top of the buried pipeline 21 is significantly reduced. The compacted original soil 6 fills the gaps between each structural layer, ensuring the integrity of the structure and the continuity of stress. The bagged soil layer 4 serves as an intermediate buffer layer, further weakening the load transmission intensity.

[0030] The prestressed double-layer anchored geocell pipeline protection structure provided in this embodiment, compared with existing technologies, balances elasticity and stiffness. The rubber-mixed soil in the geocells 22 can adapt to minor soil deformations. The synergistic effect of the upper geocell 5, the lower geocell 3, and the compacted original soil 6 can delay the development of shear failure surfaces, improve the overall stiffness of the pipe-soil system, and reduce cumulative settlement caused by repeated vehicle compaction. The integrated layered design achieves step-by-step buffering and dispersion of loads, mitigating the continuous impact of traffic cyclic loads and significantly reducing the risks of stress concentration, uneven settlement, and pipeline deformation in the surrounding soil. This structure does not require increased excavation depth, thus shortening the construction period.

[0031] In some embodiments, the geotextile bag 22 is filled with rubber-mixed soil, which is composed of sand, gravel and rubber particles, wherein the mass fraction of rubber particles is 10% to 20%.

[0032] In this embodiment, the rubber-mixed soil is designed with a combination of sand, gravel, and rubber particles. The sand and gravel provide sufficient rigid support for the geotextile bag 22, ensuring that the geotextile bag 22 does not deform excessively under load and effectively resisting the compressive stress of the soil on the side of the pipeline. The 10%~20% mass fraction of rubber particles gives the mixed soil excellent elastic deformation capacity, which can efficiently absorb the impact energy brought by traffic cycle loads, converting concentrated impact force into elastic deformation energy, and significantly reducing the load intensity transmitted to the pipeline sidewall.

[0033] In practical implementation, rubber granules can be made from recycled waste rubber, which not only realizes the resource utilization of waste and reduces material costs, but also improves the wear resistance and aging resistance of the mixed soil, extending the service life of the geotextile bags. The compounded rubber-soil mixture balances rigidity and elasticity, which can adapt to minor soil deformations, avoid pipeline damage caused by rigid collisions, and maintain structural stability over a long period of time. It is suitable for different traffic load intensities and soil conditions, and its practicality and economy are significantly better than traditional protective materials.

[0034] In some embodiments, see Figure 1 and Figure 2 The upper geocell 5 has a first buckle 51 at each of its four top corners, and the lower geocell 3 has a second buckle 31 at each of its four top corners corresponding to the first buckle 51. An anchor rod 7 is provided between the upper geocell 5 and the lower geocell 3, and the upper and lower ends of the anchor rod 7 are respectively engaged with the first buckle 51 and the corresponding second buckle 31.

[0035] In practice, the inner ring size of the buckle is larger than the mesh size of the upper geocell 5.

[0036] This embodiment constructs a stable three-dimensional anchoring structure by setting first buckles 51 and second buckles 31 at the four corners of the upper geocell 5 and the lower geocell 3, respectively, and using anchor rods 7 for interlocking. This transforms the originally independent two-layer geocells into a unified force-bearing structure, ensuring that the two layers work together under load and that stress is evenly transferred, avoiding protection failure caused by overload of a single-layer geocell. The precise correspondence between the buckles and the anchor rods 7 ensures the vertical alignment of the upper geocell 5 and the lower geocell 3, allowing the bagged soil layer 4 to be evenly compressed, further improving the load dispersion effect. The interlocking method is convenient to install, requiring no complex welding or pouring processes, shortening the construction cycle, and facilitating later maintenance and adjustment. When slight soil settlement occurs, the position of the geocell can be finely adjusted through the interlocking relationship between the buckles and the anchor rods 7, ensuring that the protective structure continuously adapts to the surrounding environment of the pipeline.

[0037] In some embodiments, see Figure 3 and Figure 4Nuts 71 are screwed to both ends of the anchor rod 7. The first buckle 51 includes a fixing plate 511 and a connecting plate 512. The fixing plate 511 is installed at the top corner of the upper geocell 5. The connecting plate 512 is connected to the fixing plate 511 and forms a ring structure. The inner ring of the fixing plate 511 and the inner ring of the connecting plate 512 abut against the anchor rod 7, and the top of the fixing plate 511 and the connecting plate 512 abut against the corresponding nuts 71. The two nuts 71 on the same anchor rod 7 are fitted together to clamp the upper geocell 5 and the lower geocell 3.

[0038] In this embodiment, the anchor rod 7 is screwed with nuts 71 at both ends, which, together with the snap-fit ​​structure composed of the fixing plate 511 and the connecting plate 512, realize the adjustable function of the spacing between the upper geocell 5 and the lower geocell 3. During construction, the spacing between the geocells can be precisely adjusted by tightening or loosening the nuts 71 according to the compaction degree of the bagged soil layer 4, the burial depth of the pipeline, and the load intensity, ensuring that the geocells are fully fitted with the bagged soil layer 4 and avoiding stress concentration caused by gaps. The ring structure formed by the fixing plate 511 and the connecting plate 512 increases the contact area with the upper geocell 5 and the lower geocell 3, so that the clamping force is evenly distributed and avoids material damage caused by excessive local stress in the geocells. The abutment fit between the nuts 71 and the snap-fit ​​achieves double fixation, which not only ensures the firmness of the structural connection, but also effectively resists the vibration and impact of traffic loads and prevents loosening and failure during long-term use.

[0039] In practice, both the anchor bolt 7 and the nut 71 are made of stainless steel. The stainless steel anchor bolt 7 and nut 71 have excellent corrosion resistance, which extends the service life of the structure and ensures long-term stable operation in complex soil environments such as humid and acidic / alkaline conditions, further improving the reliability and applicability of the protective structure.

[0040] In some embodiments, the strip materials of both the lower geocell 3 and the upper geocell 5 are high-density polyethylene (HDPE). Leveraging its core advantages of being lightweight, wear-resistant, corrosion-resistant, and highly resistant to acids and alkalis, HDPE's light weight significantly reduces the overall self-weight of the protective structure, effectively alleviating the bearing burden on the foundation, making it particularly suitable for conditions with weak bearing capacity, such as soft soil foundations. HDPE's wear and corrosion resistance can resist the erosion of acidic and alkaline substances in the soil, groundwater, and microorganisms, preventing material aging and damage during long-term use and ensuring the continued effectiveness of the lateral restraint function of the geocells. HDPE's good flexibility allows it to adapt to minor soil deformations, preventing protective failure caused by the fracture of rigid materials. Combined with its high strength, it can effectively disperse traffic loads and reduce the pressure transmitted to the pipeline.

[0041] In some embodiments, see Figure 1 and Figure 2Multiple first anchor cables 52 are provided on the outer periphery of the upper geocell 5. The multiple first anchor cables 52 are used to apply prestress to the upper geocell 5 pointing towards the soil on both sides. On the four sides of the upper geocell 5, multiple first anchor cables 52 on one pair of sides are perpendicular to the axial direction of the buried pipeline 21 and gradually tilt outward from top to bottom. Multiple first anchor cables 52 on the other two sides are perpendicular to the radial direction of the buried pipeline 21. Multiple second anchor cables 32 are provided on the outer periphery of the lower geocell 3. The multiple second anchor cables 32 are used to apply prestress to the lower geocell 3 pointing towards the soil on both sides. On the four sides of the lower geocell 3, multiple second anchor cables 32 on one pair of sides are perpendicular to the axial direction of the buried pipeline 21 and gradually tilt outward from top to bottom. Multiple second anchor cables 32 on the other two sides of the lower geocell 3 are perpendicular to the radial direction of the buried pipeline 21.

[0042] This embodiment constructs a bidirectional lateral reinforcement system by setting inclined first anchor cables 52 and second anchor cables 32 on the outer periphery of the upper geocell 5 and the lower geocell 3, respectively, and applying prestress pointing towards the soil on both sides. This effectively resists lateral displacement and uneven settlement of the soil. The design of the first anchor cable 52 and the second anchor cable 32, which are perpendicular to the axial direction of the buried pipeline 21 and inclined outward from top to bottom, allows the prestress to be evenly transferred to the geocell and the surrounding soil, forming a reverse constraint force. This suppresses the squeezing deformation of the soil towards the buried pipeline 21 under traffic loads and further disperses the stress concentration around the buried pipeline 21. The first anchor cable 52 mainly suppresses the lateral impact caused by traffic dynamic loads, while the second anchor cable 32 focuses on resisting the lateral displacement caused by foundation settlement. The upper and lower cables work together to form all-round lateral protection, significantly improving the overall stability of the pipe-soil system. The prestress applied by the first anchor cable 52 and the second anchor cable 32 can be adjusted by tensioning to adapt to different traffic load intensities and soil conditions, providing high construction flexibility.

[0043] In some embodiments, the bagged soil layer 4 comprises multiple stacked soil bags, each filled with on-site soil. The use of on-site soil bags in the bagged soil layer 4 fully utilizes the soil resources available at the construction site, eliminating the need for long-distance transportation of backfill soil and significantly reducing material transportation costs and construction energy consumption. The soil bags possess good tensile strength and permeability, effectively constraining the internal fill and preventing soil collapse and loss, ensuring the structural integrity of the bagged soil layer 4. Simultaneously, it allows for moisture exchange between the soil and the external environment, preventing soil softening due to water accumulation and improving interlayer stability. The buffer layer formed by the stacked arrangement of multiple soil bags further disperses the loads transmitted from the upper geocell 5 and the lower geocell 3, transforming concentrated stress into uniformly distributed surface loads and reducing the pressure transmitted to the lower structure and pipelines. The soil bags are convenient to install, can be filled and stacked on-site, shortening the construction cycle, and can be recycled during later dismantling, minimizing environmental impact.

[0044] Based on the same inventive concept, this application also provides a construction method for manufacturing a pipe protection structure of a prestressed double-layer anchored geocell as described in any of the above embodiments, comprising the following steps: S1: processing a foundation treatment layer; S2: laying crushed stone on the foundation treatment layer to form a graded crushed stone layer 1 for drainage; S3: laying a buried pipe 21 on the graded crushed stone layer 1, and stacking geotextile bags 22 on both sides of the buried pipe 21; S4: laying compacted soil 6 on top of the geotextile bags 22 and the buried pipe 21, and installing a lower geocell 3 on top of the compacted soil 6; S5: laying a bagged soil layer 4 on top of the lower geocell 3, and installing an upper geocell 5 on top of the bagged soil layer 4; S6: laying compacted soil 6 on top of the upper geocell 5, and constructing a road surface after the laying is completed.

[0045] The construction method provided in this embodiment has the following advantages compared with the prior art: (1) This structure balances elasticity and stiffness. The rubber-mixed soil in the geocell 22 can adapt to minor soil deformation. The synergistic effect of the upper geocell 5, the lower geocell 3, and the compacted original soil 6 can delay the development of the shear failure surface, improve the overall stiffness of the pipe-soil system, and reduce the cumulative settlement caused by repeated vehicle compaction. The integrated layered design realizes the gradual buffering and dispersion of loads, alleviates the continuous impact of traffic cycle loads, and significantly reduces the risk of stress concentration, uneven settlement, and pipe deformation in the surrounding soil. This structure does not require deepening the excavation depth, which can shorten the construction period.

[0046] (2) Steps S1-S2 first complete the foundation and drainage system construction to provide a stable foundation for subsequent structures and avoid later settlement caused by uneven foundation or poor drainage; Step S3 sets up geotextile bags 22 to achieve precise construction of lateral protection for pipelines; Steps S4-S5 level the original soil 6 by compacting it and laying geocells and bagged soil layers 4 in layers to ensure that each structural layer is fully bonded and improve the continuity of stress; Step S6 completes the top protection and road construction to form a complete load transfer path. This process does not require complex equipment or special processes, is convenient and efficient to construct, does not require deepening the excavation depth, and causes minimal damage to surrounding underground pipelines and structures, greatly improving the adaptability of construction in urban core areas. Layered construction facilitates process quality control and allows for timely adjustment of the laying thickness and compaction degree of each structural layer to ensure compliance with design requirements; it not only reduces construction difficulty and engineering costs, but also ensures the construction quality of the protective structure and ensures its long-term stable protective function, making it suitable for large-scale municipal pipeline renovation, pipeline laying in traffic load areas and other engineering scenarios.

[0047] In some embodiments, step S5 further includes connecting the lower geocell 3 to the upper geocell 5. The two geocell layers transform from independent load-bearing to collaborative load-bearing. The connection is achieved through the cooperation of anchor rods 7 and clips. During construction, the cell spacing can be precisely adjusted according to the compaction of the bagged soil layer 4 to ensure that the geocells and the bagged soil layer 4 are fully fitted, avoiding stress concentration caused by gaps and improving load dispersion. The connected double-layer geocells form a stable three-dimensional frame that can effectively resist the vibration impact and lateral displacement of the soil caused by traffic loads, enhancing the structure's resistance to overturning and sliding. The connected structure can better utilize the prestressed anchor cables, allowing the prestress to be evenly transferred to the entire protection system, further improving the resistance to traffic cyclic loads, ensuring the safe and stable operation of the pipeline during long-term use, and adapting to complex working conditions such as soft soil foundations and high-intensity traffic loads.

[0048] In some embodiments, the height of the upper geocell 5 is 100mm~150mm; the height of the lower geocell 3 is 100mm~150mm; and the height of the bagged soil layer 4 is 500mm~1000mm. Clearly defining the height ranges of the upper geocell 5, lower geocell 3, and bagged soil layer 4 makes the construction design more targeted and operable, solving the defects of vague dimensional design and poor adaptability in traditional protective structures. A geocell height of 100mm~150mm ensures the lateral restraint capacity of the cells, effectively distributing the load, without causing material waste or increased self-weight due to excessive height, adapting to the protection needs of pipelines with different pipe diameters and load intensities. A bagged soil layer 4 height of 500mm~1000mm fully utilizes buffering and stress dispersion effects, providing a good stress transition between the upper geocell 5 and lower geocell 3, and preventing the load from being directly transferred to the lower structure.

[0049] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pipe protection structure for prestressed double-layer anchored geocells, characterized in that, It includes a foundation treatment layer, a graded crushed stone layer (1), a pipe layer (2), a lower geocell (3), a bagged soil layer (4), and an upper geocell (5) arranged sequentially from bottom to top. Among them, there is compacted original soil (6) between the pipeline layer (2) and the lower geocell (3), and between the upper geocell (5) and the ground surface; The lower geocell (3) and the upper geocell (5) are connected; The pipeline layer (2) has multiple stacked geotextile bags (22), which are located on the left and right sides of the buried pipeline (21), and each geotextile bag (22) contains rubber-mixed soil.

2. The pipeline protection structure of the prestressed double-layer anchored geocell as described in claim 1, characterized in that, The rubber-mixed soil fills the geotextile bag (22). The rubber-mixed soil is composed of sand, gravel and rubber particles, wherein the mass fraction of the rubber particles is 10% to 20%.

3. The pipeline protection structure of the prestressed double-layer anchored geocell as described in claim 1, characterized in that, The upper geocell (5) is provided with a first buckle (51) at each of its four apex corners, and the lower geocell (3) is provided with a second buckle (31) at each of its four apex corners corresponding to the first buckle (51). An anchor rod (7) is provided between the upper geocell (5) and the lower geocell (3), and the upper and lower ends of the anchor rod (7) are respectively engaged with the first buckle (51) and the corresponding second buckle (31).

4. The pipeline protection structure of the prestressed double-layer anchored geocell as described in claim 3, characterized in that, Nuts (71) are screwed to both ends of the anchor rod (7); The first latch (51) includes: A fixing plate (511) is installed at the top corner of the upper geocell (5); and The docking plate (512) docks with the fixed plate (511) and forms a ring structure. The inner ring of the fixed plate (511) and the inner ring of the docking plate (512) abut against the anchor rod (7) respectively. The tops of the fixed plate (511) and the docking plate (512) abut against the corresponding nuts (71) respectively. The two nuts (71) on the same anchor rod (7) are fitted together to clamp the upper geocell (5) and the lower geocell (3).

5. The pipeline protection structure of the prestressed double-layer anchored geocell as described in claim 1, characterized in that, The strip material of both the lower geocell (3) and the upper geocell (5) is high-density polyethylene.

6. The pipeline protection structure of the prestressed double-layer anchored geocell as described in claim 1, characterized in that, The outer periphery of the upper geocell (5) is provided with a plurality of first anchor cables (52), which are used to apply prestress to the upper geocell (5) in the direction of the soil on both sides; on the four sides of the upper geocell (5), the plurality of first anchor cables (52) on one pair of sides are perpendicular to the axial direction of the buried pipeline (21) and gradually tilt outward from top to bottom, while the plurality of first anchor cables (52) on the other two sides are perpendicular to the radial direction of the buried pipeline (21); The lower geocell (3) is provided with a plurality of second anchor cables (32) on its outer periphery. The plurality of second anchor cables (32) are used to apply prestress to the lower geocell (3) pointing to the soil on both sides. On the four sides of the lower geocell (3), the plurality of second anchor cables (32) on one pair of sides are perpendicular to the axial direction of the buried pipeline (21) and gradually tilt outward from top to bottom. The plurality of second anchor cables (32) on the other two sides of the lower geocell (3) are perpendicular to the radial direction of the buried pipeline (21).

7. The pipeline protection structure of the prestressed double-layer anchored geocell as described in claim 1, characterized in that, The bagged soil layer (4) includes: Multiple stacked soil bags, each filled with on-site soil.

8. A construction method for manufacturing a pipe protection structure of a prestressed double-layer anchored geocell as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1: Processing foundation treatment layer; S2: A graded crushed stone layer (1) is laid on the foundation treatment layer for drainage; S3: Lay a buried pipe (21) on the graded crushed stone layer (1) and stack geotextile bags (22) on both sides of the buried pipe (21); S4: Lay compacted original soil (6) on top of the geotextile bag (22) and the buried pipeline (21), and install the lower geocell (3) on top of the compacted original soil (6); S5: Lay a bagged soil layer (4) on top of the lower geocell (3) and install an upper geocell (5) on top of the bagged soil layer (4); S6: Lay and compact the original soil (6) on top of the upper geocell (5), and construct the road surface after the paving is completed.

9. The construction method as described in claim 8, characterized in that, Step S5 is followed by: Connect the lower geocell (3) to the upper geocell (5).

10. The construction method as described in claim 8, characterized in that, The height of the upper geocell (5) is 100mm~150mm; The height of the lower geocell (3) is 100mm~150mm; The height of the bagged soil layer (4) is 500mm~1000mm.

Images