Highway modular reinforcing structure suitable for soft soil subgrade and construction method thereof

Abstract

The application discloses a highway modular reinforcing structure suitable for soft soil subgrade and a construction method thereof, and belongs to the technical field of highway construction. The highway modular reinforcing structure comprises a subgrade anchoring layer, a drainage buffer layer, a reinforcing layer and a pavement connecting layer, the subgrade anchoring layer is connected with the soft soil subgrade, the drainage buffer layer is arranged above the subgrade anchoring layer and comprises a buffer cushion layer, a drainage filter screen and a drainage blind ditch which are sequentially arranged in the up-down direction, the buffer cushion layer is prepared by using graded sand and gravel mixture, and a plurality of drainage holes are formed in the side wall of the drainage blind ditch; the reinforcing layer comprises a plurality of reinforcing modules which are detachably connected, each reinforcing module comprises a reinforcing main body and a steel reinforcement framework, the reinforcing main body is prepared by using fiber concrete, the steel reinforcement framework is arranged in the reinforcing main body, the reinforcing main body is provided with a plurality of water permeable holes and is detachably connected with the subgrade anchoring layer; and the pavement connecting layer is arranged above the reinforcing layer and is provided with anti-skid textures on the top surface. The application realizes efficient reinforcement and long-term stability of the soft soil subgrade, reduces the water content of the soft soil, improves the anti-skid property, improves the construction efficiency, has small maintenance difficulty and low cost, and does not need to excavate a large amount of soft soil.

Description

Technical Field

[0001] This invention relates to the field of highway subgrade technology, specifically to a modular reinforcement structure for highways suitable for soft soil subgrades and its construction method. Background Technology

[0002] Soft soil subgrades are characterized by high water content, large void ratio, high compressibility, low bearing capacity, and long settlement stabilization time. In highway construction, improper treatment of soft soil subgrade areas can easily lead to uneven settlement, cracking, and slippage, affecting not only the safety and comfort of highway traffic but also secondary disasters such as pavement damage and bridge misalignment, increasing maintenance costs and shortening the highway's service life. Currently, existing soft soil subgrade reinforcement technologies mainly include replacement methods, drainage consolidation methods, compaction pile methods, and reinforced soil pile methods. Replacement methods require the excavation of large amounts of soft soil and backfilling with high-quality filler, resulting in large-scale construction, long construction periods, high resource consumption, and significant damage to the surrounding ecological environment. They are not suitable for reinforcing deep soft soil subgrades. Drainage consolidation methods (such as surcharge preloading and vacuum preloading) have long construction cycles, are significantly affected by weather, and their reinforcement effect is limited by the permeability of soft soil, making it difficult to meet the needs of rapid highway construction. Although compaction piles and reinforced soil piles can improve the bearing capacity of the subgrade, the piles and subgrade soil have poor synergy, which can easily lead to pile-soil separation. After long-term use, they are prone to secondary settlement, and the construction process is complex, making it difficult to accurately control the construction quality.

[0003] In addition, existing soft soil subgrade reinforcement structures are mostly monolithic designs, requiring on-site pouring or splicing during construction, resulting in poor construction flexibility. If local reinforcement fails, the entire structure needs to be excavated and repaired, which is difficult, costly, and will affect the normal traffic flow of the highway. At the same time, existing reinforcement structures lack effective drainage and anti-skid coordination design, making it difficult for water in the soft soil subgrade to drain quickly, which can easily lead to a decrease in soil strength and thus affect the stability of the reinforcement structure. Summary of the Invention

[0004] The main objective of this invention is to propose a modular reinforcement structure for highways with soft soil subgrade and its construction method, aiming to solve the above-mentioned problems.

[0005] To achieve the above objectives, this invention proposes a modular reinforcement structure for highways suitable for soft soil subgrades, comprising:

[0006] The subgrade anchoring layer is used for anchoring connection with the soft soil subgrade; A drainage buffer layer, laid above the subgrade anchoring layer, is used to drain water from the soft soil subgrade. It includes a buffer pad layer, a drainage filter, and a drainage ditch arranged sequentially in the vertical direction. The buffer pad layer is made of graded sand and gravel mixture with a porosity of 30%-40%. The drainage ditch is located between the drainage filter and the subgrade anchoring layer. The sidewall of the drainage ditch has multiple drainage holes, and both ends of the drainage ditch are used to connect with the drainage ditch on the outside of the highway subgrade slope. The reinforcement layer includes multiple detachably connected reinforcement modules. Each reinforcement module includes a reinforcement body and a steel reinforcement skeleton. The reinforcement body is prefabricated from fiber-reinforced concrete and contains the steel reinforcement skeleton. It also has multiple permeable holes, each of which penetrates the reinforcement body vertically and communicates with the drainage ditch. The reinforcement body is detachably connected to the roadbed anchoring layer. A road surface connection layer is laid on top of the reinforcement layer to connect the reinforcement layer and the road surface of the highway. The road surface connection layer is made of modified asphalt and polyester fiber, and the top surface of the road surface connection layer is provided with anti-slip texture.

[0007] Optionally, the subgrade anchoring layer includes multiple anchor piles and an anchoring mesh. The multiple anchor piles are spaced apart in the horizontal plane, and the bottom end of the anchor pile is used to be inserted into the soft soil bearing layer of the soft soil subgrade. The anchoring mesh is placed on the top of the anchor pile and is used to be in contact with the top surface of the soft soil subgrade. The horizontal plane is perpendicular to the vertical direction.

[0008] Optionally, the anchor pile includes a connecting section and an anchoring section distributed sequentially in the vertical direction. The connecting section is connected to the anchoring mesh and the reinforcement layer. The anchoring section is inserted into the soft soil bearing layer, and the length of the anchoring section is greater than or equal to 1.5m.

[0009] Optionally, the anchor pile is fitted with a plurality of anti-slip protrusions, which are spaced apart in the vertical direction and embedded within the soft soil bearing layer; and / or, The anchoring mesh is galvanized steel wire mesh.

[0010] Optionally, the bottom side of the reinforcing body is provided with an anchoring connection seat, which is connected to the top flange of the anchor pile.

[0011] Optionally, a corrugated pipe is provided between the drainage filter and the roadbed anchoring layer, and the drainage blind ditch is formed in the corrugated pipe, the diameter of the corrugated pipe being 150-200mm; The diameter of the drainage hole is 10-15mm, and the distance between any two adjacent drainage holes is 100-150mm.

[0012] Optionally, the reinforcing body is arranged in the form of a cuboid, and the four peripheral sidewalls of the reinforcing body connected in sequence on the horizontal plane are respectively provided with splicing grooves or splicing protrusions. One of the two symmetrical peripheral sidewalls is provided with the splicing groove and the other is provided with the splicing protrusion. The splicing groove and the splicing protrusion are adapted to each other so that any two adjacent reinforcing bodies can be spliced ​​together through the splicing groove and the splicing protrusion.

[0013] Optionally, the top side of the reinforcing body is provided with a connecting groove, and a portion of the road surface connection layer is placed in the connecting groove.

[0014] Optionally, a water-permeable gap is provided between any two adjacent reinforced bodies, and the water-permeable gap is connected to the water-permeable hole.

[0015] This invention also provides a construction method for a modular reinforcement structure for highways with soft soil subgrade, applicable to the aforementioned modular reinforcement structure for highways with soft soil subgrade. The construction method for the modular reinforcement structure for highways with soft soil subgrade includes the following steps: The soft soil subgrade was investigated, and the top surface of the soft soil subgrade was cleared and leveled. The soft soil subgrade is anchored to the subgrade anchoring layer. A buffer layer, a drainage filter, and a drainage ditch are laid on top of the roadbed anchoring layer, and both ends of the drainage ditch are extended to the drainage ditch on the outside of the highway roadbed slope. Multiple reinforcement modules are hoisted onto the buffer pad layer and spliced ​​together in a preset order to form a reinforcement layer, which is detachably connected to the roadbed anchoring layer. A mixture of modified asphalt and polyester fiber is laid on the reinforced layer and compacted to form a road surface bonding layer; The quality of the subgrade anchoring layer, the drainage buffer layer, the reinforcement layer, and the pavement connection layer is tested.

[0016] In the technical solution of this invention, the upper load is evenly transferred to the soft soil bearing layer through the coordinated operation of the subgrade anchoring layer, the drainage buffer layer, and the reinforcement layer, effectively improving the bearing capacity of the soft soil subgrade and reducing subgrade settlement (settlement can be controlled within 5mm), thus achieving efficient reinforcement and long-term stability of the soft soil subgrade. Simultaneously, a drainage network is formed by the buffer layer, the drainage filter, the drainage blind ditch, and the permeable holes of the reinforcement body, which can quickly drain moisture from the soft soil subgrade, reduce the water content of the soft soil, and improve soil strength. Furthermore, the pavement connection layer is provided with anti-skid texture, which can improve the synergy and anti-skid performance between the pavement and the reinforcement structure, extending the service life of the reinforcement structure and the highway. Furthermore, the reinforcement modules are detachably connected, requiring only direct splicing and installation on-site without the need for on-site pouring, significantly reducing on-site construction work, improving construction efficiency, and being unaffected by weather, enabling rapid construction, shortening the construction period, and meeting the needs of rapid highway construction. In the event of local reinforcement failure, there is no need for overall excavation and repair; only the damaged reinforcement module needs to be disassembled and replaced, making repairs less difficult and less costly, and not affecting normal highway traffic during the repair process, thus reducing traffic disruption. In addition, when reinforcing soft soil subgrades, there is no need for extensive excavation of soft soil, reducing resource consumption and ecological damage. Moreover, the main reinforcement body is made of precast fiber concrete, which is recyclable and reusable, in line with the concept of environmental protection and energy conservation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A cross-sectional view of an embodiment of the modular reinforcement structure for highways with soft soil subgrade provided by the present invention; Figure 2 for Figure 1 Partial structural diagram; Figure 3 for Figure 2 Top view; Figure 4 for Figure 1 Partial structural diagram; Figure 5 for Figure 4 Top view; Figure 6 for Figure 1 Partial structural diagram; Figure 7 for Figure 6 Top view; Figure 8 for Figure 7 A structural schematic diagram at one angle; Figure 9 for Figure 7 Another structural diagram; Figure 10 for Figure 1 Top view; Figure 11 A flowchart illustrating the construction method of a modular reinforcement structure for highways with soft soil subgrade, provided by the present invention.

[0019] Explanation of icon numbers: 100. Modular reinforcement structure for highways with soft soil subgrade; 1. Subgrade anchoring layer; 11. Anchor pile; 111. Connecting section; 112. Anchoring section; 12. Anchoring mesh; 13. Anti-slip protrusion. 2. Drainage buffer layer; 21. Buffer pad layer; 22. Drainage filter screen; 23. Drainage blind ditch; 231. Drainage hole; 3. Reinforcing layer; 31. Reinforcing module; 311. Reinforcing body; 3111. Splicing groove; 3112. Splicing protrusion; 312. Water-permeable hole; 32. Water-permeable gap. 4. Road surface bonding layer; 41. Anti-slip texture; 200. Soft soil subgrade; 210. Soft soil bearing layer.

[0020] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention 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 the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0024] Soft soil subgrades are characterized by high water content, large void ratio, high compressibility, low bearing capacity, and long settlement stabilization time. In highway construction, improper treatment of soft soil subgrade areas can easily lead to uneven settlement, cracking, and slippage, affecting not only the safety and comfort of highway traffic but also secondary disasters such as pavement damage and bridge misalignment, increasing maintenance costs and shortening the highway's service life. Currently, existing soft soil subgrade reinforcement technologies mainly include replacement methods, drainage consolidation methods, compaction pile methods, and reinforced soil pile methods. Replacement methods require the excavation of large amounts of soft soil and backfilling with high-quality filler, resulting in large-scale construction, long construction periods, high resource consumption, and significant damage to the surrounding ecological environment. They are not suitable for reinforcing deep soft soil subgrades. Drainage consolidation methods (such as surcharge preloading and vacuum preloading) have long construction cycles, are significantly affected by weather, and their reinforcement effect is limited by the permeability of soft soil, making it difficult to meet the needs of rapid highway construction. Although compaction piles and reinforced soil piles can improve the bearing capacity of the subgrade, the piles and subgrade soil have poor synergy, which can easily lead to pile-soil separation. After long-term use, they are prone to secondary settlement, and the construction process is complex, making it difficult to accurately control the construction quality.

[0025] In addition, existing soft soil subgrade reinforcement structures are mostly monolithic designs, requiring on-site pouring or splicing during construction, resulting in poor construction flexibility. If local reinforcement fails, the entire structure needs to be excavated and repaired, which is difficult, costly, and will affect the normal traffic flow of the highway. At the same time, existing reinforcement structures lack effective drainage and anti-skid coordination design, making it difficult for water in the soft soil subgrade to drain quickly, which can easily lead to a decrease in soil strength and thus affect the stability of the reinforcement structure.

[0026] In view of this, the present invention provides a modular reinforcement structure 100 for highways suitable for soft soil subgrades. Figures 1 to 10 This invention provides an embodiment of a modular reinforcement structure 100 for highways with soft soil subgrade.

[0027] Please see Figures 1 to 10 The modular reinforcement structure 100 for highways with soft soil subgrade includes a subgrade anchoring layer 1, a drainage buffer layer 2, a reinforcement layer 3, and a pavement connection layer 4. The subgrade anchoring layer 1 is used for anchoring and connecting with the soft soil subgrade 200. The drainage buffer layer 2 is laid on top of the subgrade anchoring layer 1 to drain water from the soft soil subgrade 200. It includes a buffer pad layer 21, a drainage filter 22, and a drainage blind ditch 23 arranged sequentially in the vertical direction. The buffer pad layer 21 is made of graded sand and gravel mixture with a porosity of 30%-40%. The drainage blind ditch 23 is located between the drainage filter 22 and the subgrade anchoring layer 1. The sidewall of the drainage blind ditch 23 has multiple drainage holes 231, and both ends of the drainage blind ditch 23 are used to connect with the highway. The drainage ditch on the outside of the roadbed slope is connected; the reinforcement layer 3 includes multiple detachably connected reinforcement modules, each reinforcement module including a reinforcement body 311 and a steel reinforcement skeleton. The reinforcement body 311 is made of precast fiber concrete. The reinforcement body 311 contains the steel reinforcement skeleton and has multiple water-permeable holes 312. Each water-permeable hole 312 is arranged to penetrate the reinforcement body 311 in the vertical direction and is connected to the drainage blind ditch 23. The reinforcement body 311 is detachably connected to the roadbed anchoring layer 1; the pavement connection layer 4 is laid on top of the reinforcement layer 3 to connect the reinforcement layer 3 and the road surface of the highway. The pavement connection layer 4 is made of modified asphalt and polyester fiber, and the top surface of the pavement connection layer 4 is provided with anti-slip texture 41.

[0028] In the technical solution of this invention, through the coordinated operation of the subgrade anchoring layer 1, the drainage buffer layer 2, and the reinforcement layer 3, the upper load is evenly transferred to the soft soil bearing layer 210, effectively improving the bearing capacity of the soft soil subgrade 200 and reducing the subgrade settlement (the settlement can be controlled within 5mm), thus achieving efficient reinforcement and long-term stability of the soft soil subgrade 200. Simultaneously, a drainage network is formed by the buffer pad layer 21, the drainage filter 22, the drainage blind ditch 23, and the permeable holes 312 of the reinforcement body 311, which can quickly drain water from the soft soil subgrade 200, reducing the water content of the soft soil and improving soil strength. Furthermore, the pavement connection layer 4 is provided with anti-skid texture 41, which can improve the synergy and anti-skid performance between the pavement and the reinforcement structure, extending the reinforcement period. The structure and highway service life are improved; furthermore, the reinforcement modules are detachably connected, requiring only direct splicing and installation on site without on-site pouring, significantly reducing on-site construction work, improving construction efficiency, and being unaffected by weather, enabling rapid construction, shortening the construction period, and meeting the needs of rapid highway construction. In case of local reinforcement failure, there is no need for overall excavation and repair; only the damaged reinforcement module needs to be disassembled and replaced, making repairs less difficult and less costly, and not affecting normal highway traffic during the repair process, reducing traffic disruption. In addition, when reinforcing soft soil subgrade 200, there is no need to excavate a large amount of soft soil, reducing resource consumption and ecological damage. Moreover, the reinforcement body 311 is made of precast fiber concrete, which is recyclable and reusable, in line with the concept of environmental protection and energy conservation.

[0029] It should be noted that, in this invention, the subgrade anchoring layer 1 is used to firmly connect the entire reinforced structure with the soft soil bearing layer 210, thereby improving the overall anti-slip capability of the structure; the drainage buffer layer 2 is used to drain the water in the soft soil subgrade 200, reduce the water content of the soft soil, and buffer the upper load, reducing the impact of the modular reinforced body 311 on the soft soil subgrade 200; the reinforced layer 3 is used to bear the upper pavement load and evenly transfer the load to the subgrade anchoring layer 1 and the soft soil bearing layer 210, thereby improving the bearing capacity of the soft soil subgrade 200; the pavement connection layer 4 is used to connect the reinforced layer 3 with the highway pavement, improving the synergy between the pavement and the reinforced structure, and preventing the pavement from separating from the reinforced body 311, which could lead to pavement cracking.

[0030] It should also be noted that by limiting the porosity of the buffer pad 21 to 30%-40%, the buffer pad 21 possesses good buffering performance and water permeability. More specifically, the particle size of the sand and gravel in the buffer pad 21 is 5-20 mm.

[0031] Specifically, in one embodiment of the present invention, the thickness of the drainage buffer layer 2 is 200-300mm, and the thickness of the road surface connection layer 4 is 100-150mm.

[0032] For details, please refer to Figures 1 to 3The roadbed anchoring layer 1 includes a plurality of anchor piles 11 and an anchoring mesh 12. The plurality of anchor piles 11 are spaced apart in the horizontal plane, and the bottom end of the anchor pile 11 is used to be inserted into the soft soil bearing layer 210 of the soft soil roadbed 200. The anchoring mesh 12 is located on the top of the anchor piles 11 and is used to be in contact with the top surface of the soft soil roadbed 200. The horizontal plane is perpendicular to the vertical direction.

[0033] Thus, the anchor piles 11 can firmly connect the entire reinforced structure to the soft soil bearing layer 210, improving the overall anti-sliding capacity of the structure; the anchor net 12 can be attached to the top surface of the soft soil subgrade 200 to disperse the upper load and avoid local stress concentration that could lead to damage to the soft soil subgrade 200.

[0034] For further details, please refer to Figure 1 and Figure 2 The anchor pile 11 includes a connecting section 111 and an anchoring section 112 distributed sequentially in the vertical direction. The connecting section 111 is connected to the anchoring net 12 and the reinforcement layer 3. The anchoring section 112 is inserted into the soft soil bearing layer 210, and the length of the anchoring section 112 is greater than or equal to 1.5m.

[0035] More specifically, the anchor pile 11 is prefabricated from high-strength reinforced concrete with a diameter of 300-500mm and a length adjusted according to the thickness of the soft soil. When the soft soil thickness is 5-10m, the length of the anchor pile 11 is 8-12m, and when the soft soil thickness is 10-20m, the length of the anchor pile 11 is 15-25m.

[0036] It should be noted that in this invention, both the reinforcement module and the anchor pile 11 are prefabricated in the factory, requiring only splicing and installation on site, without the need for on-site pouring, which greatly reduces the amount of on-site construction work and can improve construction efficiency by more than 30%.

[0037] For details, please refer to Figure 1 and Figure 2 The anchor pile 11 is fitted with a plurality of anti-slip protrusions 13, which are spaced apart in the vertical direction and embedded in the soft soil bearing layer 210. This increases the friction between the anchor pile 11 and the soft soil, preventing vertical slippage of the anchor pile 11, further enhancing the structure's anti-slip capability, avoiding roadbed slippage, cracking, and other defects, and ensuring the long-term stability of the highway roadbed.

[0038] Specifically, the anchoring mesh 12 is a galvanized steel wire mesh.

[0039] It should be noted that, in this invention, the above two technical features can be set selectively or simultaneously. Specifically, in one embodiment of this invention, the anchor pile 11 is provided with a plurality of anti-slip protrusions 13, the plurality of anti-slip protrusions 13 are distributed at intervals in the vertical direction and are buried in the soft soil bearing layer 210, and the anchor mesh 12 is a galvanized steel wire mesh.

[0040] More specifically, the height of the anti-slip protrusion 13 is 50-80mm, the distance between two adjacent anti-slip protrusions 13 is 300-500mm, and the anchoring mesh 12 is a high-strength galvanized steel wire mesh with a mesh size of 100mm×100mm.

[0041] For details, please refer to Figures 1 to 4 The bottom side of the reinforcement body 311 is provided with an anchoring connection seat, which is connected to the top flange of the anchor pile 11 for easy installation and replacement.

[0042] For details, please refer to Figures 1 to 4 A corrugated pipe is provided between the drainage filter 22 and the roadbed anchoring layer 1. The drainage blind ditch 23 is formed in the corrugated pipe. The diameter of the corrugated pipe is 150-200mm. The diameter of the drainage hole 231 is 10-15mm, and the distance between any two adjacent drainage holes 231 is 100-150mm.

[0043] More specifically, in one embodiment of the present invention, the corrugated pipe is an HDPE corrugated pipe with a diameter of 150-200mm.

[0044] Specifically, in one embodiment of the present invention, the drainage filter 22 is made of geotextile to prevent soft soil particles from entering the buffer layer 21 and the drainage blind ditch 23, thereby avoiding blockage of the drainage channel.

[0045] For details, please refer to Figures 7 to 9 The reinforcing body 311 is rectangular in shape. The four peripheral sidewalls of the reinforcing body 311 connected sequentially on the horizontal plane are respectively provided with splicing grooves 3111 or splicing protrusions 3112. One of the two symmetrical peripheral sidewalls is provided with the splicing groove 3111 and the other is provided with the splicing protrusion 3112. The splicing groove 3111 and the splicing protrusion 3112 are adapted to each other so that any two adjacent reinforcing bodies 311 can be spliced ​​together by the splicing groove 3111 and the splicing protrusion 3112, which facilitates construction, transportation and maintenance.

[0046] More specifically, in one embodiment of the present invention, the dimensions of the reinforcing body 311 are 2000mm×1500mm×300mm (length×width×height), and the steel reinforcement skeleton is welded from HRB400 grade steel bars to improve the compressive strength and crack resistance of the module.

[0047] Specifically, a sealing strip is provided in the splicing groove 3111. The sealing strip extends circumferentially along the splicing groove 3111 to enhance the sealing and connection firmness between the reinforcing bodies 311 and prevent rainwater from seeping in.

[0048] Specifically, the top side of the reinforcing body 311 is provided with a connecting groove, and a portion of the road surface connecting layer is placed in the connecting groove. That is to say, when the road surface connecting layer 4 is prepared, i.e., when laying the mixture of modified asphalt and polyester fiber, part of the mixture will fill the connecting groove, so that the reinforcing layer 3 and the road surface connecting layer 4 are adapted to be connected in a concave-convex manner, thereby improving the adhesion between the road surface connecting layer 4 and the reinforcing layer 3.

[0049] Specifically, the permeable hole 312 has a diameter of 50-80mm and is used to allow water seepage from the road surface and water from the drainage buffer layer 2 to pass through from top to bottom, ensuring smooth drainage.

[0050] For details, please refer to Figure 6 A water-permeable gap 32 is provided between any two adjacent reinforced bodies 311. The water-permeable gap 32 is connected to the water-permeable hole 312 to form a complete drainage network, further improving drainage efficiency. More specifically, the width of the water-permeable gap 32 is 10-15mm.

[0051] Specifically, the polyester fiber content in the road surface bonding layer 4 is 0.3%-0.5% of the mixture mass, which improves the tensile strength and crack resistance of the road surface bonding layer 4.

[0052] Specifically, in one embodiment of the present invention, the anti-slip texture 41 has a depth of 3-5mm, which increases the friction with the highway surface and improves the smoothness of the road surface and traffic safety.

[0053] The present invention also provides a construction method for a modular reinforcement structure 100 for highways with soft soil subgrade, applicable to the modular reinforcement structure 100 for highways with soft soil subgrade described above.

[0054] Please see Figure 11 The construction method of the modular reinforcement structure 100 for highways suitable for soft soil subgrade includes the following steps: Step S100: Investigate the soft soil subgrade 200 and clean and level the top surface of the soft soil subgrade 200.

[0055] In this step, a detailed survey of the soft soil subgrade 200 construction area is first conducted. A combination of ground-penetrating radar and borehole sampling is used to determine parameters such as the thickness, distribution range, water content, and void ratio of the soft soil. Based on the survey results, construction parameters such as the length of anchor piles 11, the laying density of reinforcement modules, and the spacing of drainage blind ditches 23 are designed. Subsequently, weeds, debris, silt, etc. in the construction area are cleared, the top surface of the subgrade is leveled, and a road roller is used to initially compact the top surface of the subgrade, with a compaction degree of not less than 85%, to ensure that the top surface of the subgrade is flat and solid, laying the foundation for subsequent construction.

[0056] Step S200: Anchor the subgrade anchoring layer 1 (e.g., on the soft soil subgrade 200) to the soft soil subgrade 200. Figure 2 and Figure 3 (As shown).

[0057] In this step, according to the design parameters, the locations of the anchor piles 11 are marked on the top surface of the cleared and leveled soft soil subgrade 200. A drilling machine is used to drill holes with a diameter 50-100mm larger than the diameter of the anchor piles 11, and the drilling depth meets the design requirements (embedding at least 1.5m into the soft soil bearing layer 210). The prefabricated anchor piles 11 are then hoisted into the drilled holes, and the verticality of the anchor piles 11 is adjusted (verticality deviation not exceeding 1%). Then, the anchor piles are inserted into the gap between the drilled hole and the anchor piles 11. Cement mortar with a strength grade of not less than M10 is poured in. During the pouring process, a vibrator is used to compact the mortar to ensure that the anchor piles 11 are firmly connected to the soft soil bearing layer 210. After the cement mortar has been cured for 72 hours and has reached 70% of its design strength, the anchor mesh 12 is laid on top of all the anchor piles 11 and fixedly connected to the connecting flanges of the anchor piles 11 with bolts. During the laying process, the anchor mesh 12 is ensured to be in close contact with the top surface of the soft soil subgrade 200 without loosening or arching.

[0058] Step S300: Lay a buffer layer 21, a drainage filter 22, and a drainage blind ditch 23 (such as...) on top of the roadbed anchoring layer 1. Figure 4 and Figure 5 As shown in the figure, the two ends of the drainage blind ditch 23 are extended to the drainage ditch on the outside of the highway subgrade slope.

[0059] In this step, firstly, a drainage filter 22 is laid on top of the anchoring mesh 12 of the roadbed anchoring layer 1. The drainage filter 22 is laid flat, and the overlap width between adjacent drainage filters 22 is not less than 200mm. The overlap is fixed by stitching to prevent the drainage filter 22 from shifting. Then, a buffer pad layer 21 is laid on top of the drainage filter 22. The buffer pad layer 21 is laid in layers of graded sand and gravel mixture, with each layer being 100mm thick. It is compacted in layers using a road roller, with a compaction degree of not less than 90%, to ensure that the buffer pad layer 21 is flat and dense. Then, drainage blind ditches 23 are laid according to the design spacing. HDPE corrugated pipes are laid below the buffer pad layer 21 and attached to the anchoring mesh 12. The two ends of the drainage blind ditches 23 extend to the drainage channels on the outside of the roadbed slope to ensure smooth drainage.

[0060] It should be noted that after the drainage blind ditch 23 is installed, the connectivity of the drainage blind ditch 23 and the unobstructedness of the water permeable holes 312 should be checked to avoid blockage.

[0061] Step S400: Hoist multiple reinforcement modules onto the buffer pad layer 21 and assemble them according to a preset sequence to form the reinforcement layer 3, which is detachably connected to the roadbed anchoring layer (e.g., Figure 6 (As shown).

[0062] In this step, the prefabricated reinforcement modules are first transported to the construction area and hoisted onto the drainage buffer layer 2 using a crane. They are then assembled in a predetermined sequence of "from the middle to both sides, and from one end to the other." During assembly, the splicing protrusions 3112 of adjacent reinforcement modules are embedded into the splicing grooves 3111 to ensure a tight fit. The sealing strips in the splicing grooves 3111 are tightly fitted without any gaps. After each reinforcement module is installed, the anchoring connection seat on the bottom side of the reinforcement module is fixedly connected to the connecting flange on the top of the corresponding anchor pile 11 using high-strength bolts. The bolts are then tightened to ensure that the reinforcement module is securely installed without any loosening.

[0063] It should be noted that after all the reinforcement modules are assembled, the flatness and connection firmness of the reinforcement layer 3 should be checked. The flatness deviation should not exceed 5mm / m. If any looseness or unevenness occurs, it should be adjusted and tightened in time.

[0064] Step S500: Lay a mixture of modified asphalt and polyester fiber on the reinforced layer 3 and compact it to form the road surface bonding layer 4 (e.g., Figure 10 (As shown).

[0065] In this step, after the reinforcement layer 3 is installed, debris and dust on the top surface of the reinforcement layer 3 are cleaned. An asphalt distributor is used to apply tack coat oil to the top surface of the reinforcement layer 3 at a rate of 0.3-0.5 kg / m², ensuring even application without any omissions or accumulation. After the tack coat oil demulsifies, a mixture of modified asphalt and polyester fiber is laid. A paver is used to spread the mixture at a uniform speed to form the road surface transition layer 4, with a paving speed of 2-3 m / min and a paving thickness controlled at 100-150 mm. During paving, the mixture is ensured to be uniform without segregation. A road roller is then used to compact the pavement transition layer 4, following a compaction sequence of light to heavy and slow to fast, with a compaction degree of not less than 96%. After compaction, a grooving machine is used to engrave anti-skid texture 41 on the top surface of the road surface transition layer 4 (e.g., ...). Figure 10 As shown), the anti-slip texture 41 has a depth of 3-5mm. After engraving, clean up any debris on the road surface.

[0066] Step S600: Conduct quality inspection on the subgrade anchoring layer 1, the drainage buffer layer 2, the reinforcement layer 3, and the pavement connection layer 4.

[0067] In this step, the entire highway reinforcement structure undergoes quality testing. Testing items include: anchor pile bearing capacity, reinforcement layer flatness, connection firmness, drainage system patency, and pavement interface layer compaction. All testing indicators must meet design requirements and relevant standards. After passing the tests, the reinforced structure undergoes curing for at least 7 days. Vehicle traffic is prohibited during the curing period to prevent structural damage. Once curing is complete, highway pavement paving can commence.

[0068] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A modular reinforcement structure for highways suitable for soft soil subgrades, characterized in that, The modular reinforcement structure for highways suitable for soft soil subgrades includes: The subgrade anchoring layer is used for anchoring connection with the soft soil subgrade; A drainage buffer layer, laid above the subgrade anchoring layer, is used to drain water from the soft soil subgrade. It includes a buffer pad layer, a drainage filter, and a drainage ditch arranged sequentially in the vertical direction. The buffer pad layer is made of graded sand and gravel mixture with a porosity of 30%-40%. The drainage ditch is located between the drainage filter and the subgrade anchoring layer. The sidewall of the drainage ditch has multiple drainage holes, and both ends of the drainage ditch are used to connect with the drainage ditch on the outside of the highway subgrade slope. The reinforcement layer includes multiple detachably connected reinforcement modules. Each reinforcement module includes a reinforcement body and a steel reinforcement skeleton. The reinforcement body is prefabricated from fiber-reinforced concrete and contains the steel reinforcement skeleton. It also has multiple permeable holes, each of which penetrates the reinforcement body vertically and communicates with the drainage ditch. The reinforcement body is detachably connected to the roadbed anchoring layer. A road surface connection layer is laid on top of the reinforcement layer to connect the reinforcement layer and the road surface of the highway. The road surface connection layer is made of modified asphalt and polyester fiber, and the top surface of the road surface connection layer is provided with anti-slip texture.

2. The modular reinforcement structure for highways suitable for soft soil subgrade as described in claim 1, characterized in that, The roadbed anchoring layer includes multiple anchor piles and an anchoring mesh. The multiple anchor piles are distributed at intervals in the horizontal plane, and the bottom end of the anchor pile is used to be inserted into the soft soil bearing layer of the soft soil roadbed. The anchoring mesh is placed on the top of the anchor pile and is used to be in contact with the top surface of the soft soil roadbed. The horizontal plane is perpendicular to the vertical direction.

3. The modular reinforcement structure for highways suitable for soft soil subgrade as described in claim 2, characterized in that, The anchor pile includes a connecting section and an anchoring section distributed sequentially in the vertical direction. The connecting section is connected to the anchoring mesh and the reinforcement layer. The anchoring section is inserted into the soft soil bearing layer, and the length of the anchoring section is greater than or equal to 1.5m.

4. The modular reinforcement structure for highways suitable for soft soil subgrade as described in claim 2, characterized in that, The anchor pile is fitted with multiple anti-slip protrusions, which are spaced apart vertically and embedded within the soft soil bearing layer; and / or, The anchoring mesh is galvanized steel wire mesh.

5. The modular reinforcement structure for highways suitable for soft soil subgrade as described in claim 2, characterized in that, An anchoring connection seat is provided on the bottom side of the reinforcement body, and the anchoring connection seat is connected to the top flange of the anchor pile.

6. The modular reinforcement structure for highways suitable for soft soil subgrade as described in claim 1, characterized in that, A corrugated pipe is installed between the drainage filter and the roadbed anchoring layer, and the drainage blind ditch is formed in the corrugated pipe. The diameter of the corrugated pipe is 150-200mm. The diameter of the drainage hole is 10-15mm, and the distance between any two adjacent drainage holes is 100-150mm.

7. The modular reinforcement structure for highways suitable for soft soil subgrade as described in claim 1, characterized in that, The reinforcing body is rectangular in shape. The four peripheral sidewalls of the reinforcing body connected in sequence on the horizontal plane are respectively provided with splicing grooves or splicing protrusions. One of the two symmetrical peripheral sidewalls is provided with the splicing groove and the other is provided with the splicing protrusion. The splicing groove and the splicing protrusion are adapted to each other so that any two adjacent reinforcing bodies can be spliced ​​together through the splicing groove and the splicing protrusion.

8. The modular reinforcement structure for highways suitable for soft soil subgrade as described in claim 1, characterized in that, The top side of the reinforcement body is provided with a connecting groove, and a portion of the road surface connection layer is placed in the connecting groove.

9. The modular reinforcement structure for highways suitable for soft soil subgrade as described in claim 1, characterized in that, A water-permeable gap is provided between any two adjacent reinforced bodies, and the water-permeable gap is connected to the water-permeable hole.

10. A construction method for a modular reinforcement structure for highways with soft soil subgrade, applicable to the modular reinforcement structure for highways with soft soil subgrade as described in any one of claims 1-9, characterized in that, The construction method for the modular reinforcement structure of highways suitable for soft soil subgrade includes the following steps: The soft soil subgrade was investigated, and the top surface of the soft soil subgrade was cleared and leveled. The soft soil subgrade is anchored to the subgrade anchoring layer. A buffer layer, a drainage filter, and a drainage ditch are laid on top of the roadbed anchoring layer, and both ends of the drainage ditch are extended to the drainage ditch on the outside of the highway roadbed slope. Multiple reinforcement modules are hoisted onto the buffer pad layer and spliced ​​together in a preset order to form a reinforcement layer, which is detachably connected to the roadbed anchoring layer. A mixture of modified asphalt and polyester fiber is laid on the reinforced layer and compacted to form a road surface bonding layer; The quality of the subgrade anchoring layer, the drainage buffer layer, the reinforcement layer, and the pavement connection layer is tested.

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