Temporary to permanent repair structure and method for water damaged roadbed

Abstract

The application relates to the technical field of road engineering emergency repair, in particular to a temporary-to-permanent repair structure and method for a water-damaged roadbed, the temporary-to-permanent repair structure comprising a temporary quick repair structure before conversion and a permanent solidification structure before conversion, and a shared reuse structure; the reuse structure comprises a plurality of steel pipe piles and a plurality of prefabricated box modules which are embedded in pairs in the vertical and horizontal first directions; the prefabricated box modules are hollow and penetrate through in the water flow direction; the temporary quick repair structure further comprises a temporary repair road surface, and the permanent solidification structure at least comprises a permanent solidification road surface and a pile-in-concrete pouring body located in each steel pipe pile. The application further discloses a temporary-to-permanent repair method for a water-damaged roadbed. The temporary-to-permanent repair structure and method meet the requirements of quickness, stability and water passage of temporary quick repair, the temporary quick repair structure can be reused in the permanent solidification structure at a high proportion, and efficient connection between temporary quick repair in the flood season and permanent solidification after the flood season is realized.

Description

Technical Field

[0001] This invention relates to the field of emergency repair technology for road engineering, specifically to a temporary-to-permanent repair structure and method for water-damaged roadbeds. Background Technology

[0002] Currently, mountain roads are mostly built along mountains and rivers. During the flood season, heavy rainfall can easily cause flash floods and slope runoff to erode the roadbed and slopes, resulting in water damage such as roadbed soil loss, foundation hollowing, road surface collapse, and slope collapse. This directly blocks traffic in mountainous areas and seriously affects the travel of people in mountainous areas and the transportation of emergency supplies.

[0003] In related technologies, the mainstream emergency repair techniques for water-damaged roadbeds are divided into two categories: temporary repair and permanent repair, and these two are mutually exclusive. Specifically, temporary repairs often employ methods such as earthwork backfilling and simple block paving, which are fast to construct; permanent repairs often employ techniques such as cast-in-place concrete, pile foundation reinforcement, and masonry slope protection, which involve complex construction procedures and long maintenance periods.

[0004] However, the temporary repair structure has extremely poor stability, lacks effective drainage channels, and is very susceptible to secondary damage during the flood season. It can only maintain traffic for a very short time and requires repeated repairs. Permanent repairs cannot meet the emergency rapid traffic needs during the flood season, and the temporary repair structure needs to be completely demolished and rebuilt, resulting in a large amount of rework, serious material waste, and high overall cost.

[0005] Furthermore, even if some repair solutions exist, temporary emergency repairs and permanent repairs are no longer separate from each other, but rather the former is related to the latter. Only a small part of the temporary emergency repair structure is used as part of the permanent repair structure. It is impossible to achieve rapid emergency repairs during the flood season and then efficiently connect the construction to permanent curing after the flood season. It is also impossible to meet the requirements of speed, stability, and water flow during the temporary emergency repair period, and it is impossible to reuse a high proportion of the temporary emergency repair structure in the permanent curing structure. Summary of the Invention

[0006] This application provides a temporary-to-permanent repair structure and method for flood-damaged roadbeds, which meets the requirements of speed, stability and water flow for temporary rapid reopening. The temporary rapid reopening structure can be reused in a high proportion in the permanent curing structure, realizing efficient connection between temporary rapid reopening during the flood season and permanent curing after the flood season.

[0007] In a first aspect, embodiments of this application provide a temporary-to-permanent repair structure for water-damaged roadbeds. The temporary-to-permanent repair structure includes a temporary rapid reopening structure before conversion and a permanent curing structure before conversion, both of which include reusable structures. The reusable structure includes several steel pipe piles and several prefabricated box-type modules. Several steel pipe piles are arranged in a vertical array and are all embedded in the stable base course of the roadbed; Each of the prefabricated box-shaped modules is vertically nested within the steel pipe pile. Two vertically adjacent prefabricated box-shaped modules are connected by a positioning and fitting structure. Two horizontally adjacent prefabricated box-shaped modules are locked to each other by a wedge-shaped fitting structure. The prefabricated box-shaped modules are hollow and have a horizontal second direction similar to the water flow direction. The temporary rapid reopening structure also includes a temporary road surface. The permanent curing structure, relative to the temporary rapid reopening structure, removes the temporary road surface and adds at least a permanent curing road surface and a concrete pouring body inside each steel pipe pile.

[0008] In conjunction with the first aspect, in one embodiment, the reusable structure further includes a multi-layer cable net, with at least two layers of prefabricated box-type modules between adjacent cable net layers; each cable net layer includes several fastening sleeves and several cables; the fastening sleeves are fitted onto the steel pipe piles, and at least two perforated steel ribs are reserved on the outside of each fastening sleeve; the several cables are horizontally and vertically connected to the perforated steel ribs.

[0009] In conjunction with the first aspect, in one embodiment, the prefabricated box-type module has a hollow frame structure, which is prefabricated using lightweight high-strength reinforced concrete. A central circular hole is provided in the vertical center of the module to accommodate the steel pipe piles. A rectangular protrusion is provided in the center of the top surface of the prefabricated box-type module, and a rectangular groove is provided in the corresponding position in the center of the bottom surface. The positioning and fitting structure is formed by the cooperation of the rectangular protrusion and rectangular groove of two adjacent prefabricated box-type modules. A wedge-shaped protrusion is provided on one side of the prefabricated box-type module, and a wedge-shaped groove is provided on the other symmetrical side. The wedge-shaped fitting structure is formed by the cooperation of the wedge-shaped protrusion and wedge-shaped groove of two adjacent prefabricated box-type modules in the first horizontal direction.

[0010] In conjunction with the first aspect, in one embodiment, the permanently cured structure further includes a road surface reinforcement mesh and several reinforcement cages, each of which is housed within a number of steel pipe piles and contained within the concrete pouring body of the piles; the road surface reinforcement mesh connects all the reinforcement cages into a whole and is housed within the permanently cured road surface.

[0011] Secondly, embodiments of this application provide a method for the temporary-to-permanent repair of water-damaged roadbeds, comprising the following steps: S11: Several steel pipe piles are implanted into the stable base course of the roadbed in a vertical array; S12: Several prefabricated box-shaped modules 2 are sequentially nested on the steel pipe pile 1. Each prefabricated box-shaped module is vertically nested on a steel pipe pile. Two vertically adjacent prefabricated box-shaped modules are interlocked by a positioning and fitting structure. Two horizontally adjacent prefabricated box-shaped modules are locked to each other by a wedge-shaped fitting structure. All prefabricated box-shaped modules are hollow in the horizontal second direction, which is the same as the water flow direction, to form a through water passage. S13: Lay a temporary emergency repair road surface to form a temporary rapid clearance structure; S14: Remove the aforementioned temporary road surface repair; S15: High-strength concrete is poured into the pavement layer and all steel pipe piles to form a permanently solidified structure.

[0012] In conjunction with the second aspect, in one implementation, step S11 further includes: Based on the extent of the collapse of the water-damaged roadbed, on-site pretreatment was carried out to prepare the work surface for construction. Step S11 also includes: Based on the target stress requirements of the steel pipe piles, a layout positioning method is adopted to arrange several steel pipe piles in an array within the collapse area. If the base layer below the collapse area is soil, use a vibratory pile driving device to vertically drive steel pipe piles into the stable soil layer below the collapse area, with an implantation depth of not less than 1.5m; if the base layer below the collapse area is rock, use a core drill with an outer diameter of 30cm to excavate a foundation pit and vertically bury steel pipe piles, with an embedment depth of not less than 0.8m. After the pile driving is completed, the gaps around the pile are filled with quick-setting mortar.

[0013] In conjunction with the second aspect, in one implementation, step S12 further includes: For each set number of prefabricated box-type modules with no less than two layers laid, a layer of cable net is installed; each layer of cable net includes several fastening sleeves and several cables; the fastening sleeves are fitted and fixed to the steel pipe piles, and at least two perforated steel ribs are reserved on the outside of each fastening sleeve; the cables are connected horizontally and vertically to the perforated steel ribs.

[0014] In conjunction with the second aspect, in one implementation, before step S12, the following is further included: Several precast box-shaped modules are precast; the precast box-shaped modules have a hollow frame structure, with a central circular hole in the vertical center for the steel pipe piles to be inserted; a rectangular protrusion is provided in the center of the top surface of the precast box-shaped module, and a rectangular groove is provided in the corresponding position in the center of the ground; a wedge-shaped protrusion is provided on one side of the precast box-shaped module, and a wedge-shaped groove is provided on the other symmetrical side. Step S12 also includes: Two vertically adjacent prefabricated box-shaped modules are connected by a positioning and fitting structure formed by rectangular protrusions and rectangular grooves. Two horizontally adjacent prefabricated box-shaped modules are locked to each other by a wedge-shaped fitting structure formed by wedge protrusions and wedge grooves.

[0015] In conjunction with the second aspect, in one implementation, step S15 further includes: Reinforcing cages were installed inside each of the steel pipe piles. Reinforcing bars are laid between two adjacent reinforcing cages along the first horizontal direction and the second horizontal direction to form a road surface reinforcing mesh; the road surface reinforcing mesh extends to the edge of the roadbed repair area; some of the longitudinal bars of the road surface reinforcing mesh are bent downwards and firmly connected to the corresponding longitudinal bars of the reinforcing cages by binding or welding. The pavement layer and all steel pipe piles are integrally cast with high-strength concrete. The high-strength concrete encases the steel reinforcement cage and fills the steel pipe piles, while simultaneously submerging the pavement reinforcement mesh, forming an integrated concrete casting body within the piles and a permanently cured pavement.

[0016] In conjunction with the second aspect, in one implementation, step S12 further includes: After each layer of prefabricated box-shaped modules is laid, quick-setting mortar is filled into the joints of the wedge-shaped protrusions and wedge-shaped grooves to seal the joints.

[0017] The beneficial effects of the technical solutions provided in this application include: 1. The temporary-to-permanent repair structure of this application serves as a temporary rapid reopening structure before conversion during the flood season emergency repair phase, and as a permanent solidification structure after conversion during the post-flood solidification phase. Both the temporary rapid reopening structure and the permanent solidification structure include reusable structures. In the reusable structure, prefabricated box-shaped modules are vertically nested within steel pipe piles. Vertically adjacent modules are interlocked through a positioning and fitting structure, and horizontally adjacent modules in the first direction are locked together through a wedge-shaped fitting structure. This allows for efficient and rapid construction, meeting the requirements for rapid reopening during the flood season. The steel pipe piles serve as the load-bearing framework, along with the vertical positioning and fitting structure and wedges... The interlocking structure of the prefabricated box-type modules ensures stable roadbed support. Simultaneously, the prefabricated box-type modules are hollowed out in a horizontal second direction, aligned with the water flow direction, forming a continuous water passage. This meets the requirements of speed, stability, and water flow during temporary rapid repairs. Furthermore, the structure can be directly reused when switching from a temporary rapid repair structure to a permanent curing structure; only the temporary repair pavement needs to be removed, meeting the requirements of efficient connection and high construction efficiency. The temporary rapid repair structure can be reused in the permanent curing structure at a very high ratio, saving significant construction and demolition costs and resulting in good economic benefits. The temporary-to-permanent repair structure of this application solves the problems of easy damage during temporary repairs, long permanent repair periods, disconnect between old and new structures, and high rework costs associated with traditional methods. It achieves the dual goals of rapid repair and traffic maintenance during flood season in mountainous areas damaged by floods, and low-cost permanent curing and durability after floods. Relying on shared steel pipe piles and prefabricated box-type modules to form a framework, it achieves integrated structural connection, significantly improving the roadbed's resistance to water damage and long-term load-bearing stability, while reducing overall repair costs.

[0018] 2. The temporary-to-permanent repair method for water-damaged roadbeds proposed in this application balances emergency and permanent needs, featuring a unique two-stage construction system. During the flood season, it can be quickly assembled and opened to traffic immediately, resisting the impact of flash floods. After the flood, there is no need to dismantle core components; only the temporary repair pavement needs to be replaced to convert to a permanently cured structure, meeting the requirements of rapid, stable, and water-passing emergency repairs. The method efficiently connects temporary emergency repairs during the flood season with permanent curing afterward. Simultaneously, the entire process exhibits excellent drainage and erosion resistance, preventing secondary water damage. During the temporary repair stage, a continuous water passage in the same direction as the water flow quickly diverts flash floods, eliminating water accumulation and foundation erosion problems. After permanent curing, the entire structure is a solid reinforced concrete pile foundation with extremely strong anti-seepage, erosion, and compressive strength, completely eradicating water-damaged roadbed defects. Furthermore, the temporary-to-permanent repair method... The permanent repair method involves a structure with good overall integrity and progressively improved load-bearing capacity. In the temporary stage, a wedge-shaped interlocking structure with mesh cables forms an integrated load-bearing system to meet the requirements for temporary traffic and erosion resistance. In the permanent stage, steel pipe concrete piles, steel cages, and pavement steel mesh are poured together to form a high-strength vertical pile foundation load-bearing structure and a permanently solidified pavement, significantly improving load-bearing capacity, settlement resistance, and overturning resistance to meet the standards for long-term highway operation. Finally, the temporary-to-permanent repair method is highly efficient and flexible, adaptable to complex mountainous environments. In the emergency stage, the entire construction is prefabricated and assembled, eliminating the need for cast-in-place curing, shortening the emergency repair period by more than 60%. The permanent solidification construction relies on the existing formed framework, with simple procedures and fast construction speed, and can be adapted to roadbed damage and subsidence of various sizes and degrees in mountainous areas. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0020] Figure 1 A schematic diagram of the overall structure of the temporary rapid restoration structure during the temporary rapid restoration phase provided in this application embodiment; Figure 2 for Figure 1 Sectional view of AA; Figure 3 This is a schematic diagram of the structure of the prefabricated box-type module provided in the embodiments of this application; Figure 4 A schematic diagram of the interlocking and assembly of two adjacent prefabricated box-shaped modules in the first horizontal direction provided in an embodiment of this application; Figure 5 A schematic diagram of the assembly of two vertically adjacent prefabricated box-shaped modules provided in an embodiment of this application; Figure 6 A schematic diagram of a fastening sleeve and cable provided in an embodiment of this application; Figure 7 A cross-sectional schematic diagram of the permanent curing structure during the permanent curing stage provided in an embodiment of this application; Figure 8 A flowchart illustrating the method for temporarily converting water-damaged roadbeds to permanent repair provided in this application embodiment; Figure label: 1. Steel pipe piles; 2. Precast box-type modules; 3. Cable netting; 4. Quick-setting mortar pouring layer; 5. Temporary emergency road surface repair; 6. Wedge-shaped protrusions; 7. Wedge-shaped grooves; 8. Rectangular protrusions; 9. Rectangular grooves; 10. Module center circular hole; 11. Fastening sleeves; 12. Perforated steel ribs; 13. Cables; 14. Permanently cured road surface; 15. Reinforcing cage; 16. Road surface reinforcing mesh. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0022] This application provides a temporary-to-permanent repair structure for flood-damaged roadbeds, which meets the requirements of speed, stability, and water flow for temporary rapid reopening. The temporary rapid reopening structure can be reused in a high proportion in the permanent curing structure, realizing efficient connection between temporary rapid reopening during the flood season and permanent curing after the flood season. It is suitable for emergency rapid reopening of mountain roads during the flood season for flood damage such as slope erosion, foundation erosion, and road surface collapse, as well as subsequent permanent reinforcement and repair construction of the roadbed.

[0023] like Figures 1 to 5 As shown, in the first aspect, this application discloses an embodiment of a temporary-to-permanent repair structure for flood-damaged roadbeds. The temporary-to-permanent repair structure includes a temporary rapid-clearing structure before the conversion and a permanent curing structure after the conversion. Both the temporary rapid-clearing structure and the permanent curing structure include reusable structures. In practical applications, the temporary rapid-clearing structure is used during the flood season, and the permanent curing structure is used after the flood season.

[0024] The reusable structure comprises several steel pipe piles 1 and several prefabricated box-type modules 2.

[0025] Several steel pipe piles 1 are arranged in a vertical array and are all embedded in the stable base course of the roadbed. The several steel pipe piles 1 serve as a load-bearing skeleton shared by the temporary-to-permanent repair structure and the permanent curing structure.

[0026] Each prefabricated box-shaped module 2 is vertically nested within the steel pipe pile 1. Two vertically adjacent prefabricated box-shaped modules 2 are interlocked by a positioning and fitting structure. Two horizontally adjacent prefabricated box-shaped modules 2 are locked together by a wedge-shaped fitting structure. The prefabricated box-shaped modules 2 are hollow and open in the horizontal second direction, which is the same as the water flow direction. If the prefabricated box-shaped modules 2 form the main temporary support for the roadbed, the hollow and open horizontal second direction of the prefabricated box-shaped modules 2 forms a through-type water passage.

[0027] The temporary rapid clearance structure also includes a temporary emergency road surface 5. The permanent curing structure, compared to the temporary rapid clearance structure, removes the temporary emergency road surface 5 and adds a permanent curing road surface 14 and a concrete pouring body located in each steel pipe pile 1.

[0028] Specifically, the first horizontal direction and the second horizontal direction correspond to the row and column directions of the steel pipe pile array. If the first horizontal direction is the row direction of the steel pipe pile array, then the second horizontal direction is the column direction; if the first horizontal direction is the column direction of the steel pipe pile array, then the second horizontal direction is the row direction. The vertical direction is the Z-direction.

[0029] The temporary-to-permanent repair structure of this application embodiment is a temporary rapid-clearance structure before conversion during the flood season emergency repair phase, and a permanent solidification structure after conversion during the post-flood solidification phase. Both the temporary rapid-clearance structure and the permanent solidification structure include a reusable structure. In the reusable structure, prefabricated box-type modules 2 are vertically nested within steel pipe piles 1. Vertically adjacent modules are interlocked by a positioning and fitting structure, and horizontally adjacent modules in the first direction are locked together by a wedge-shaped fitting structure. This allows for efficient and rapid construction, meeting the requirements for rapid flood season emergency repairs. The steel pipe piles serve as the load-bearing framework, and the vertical positioning and fitting structure, along with the wedges... The interlocking structure can meet the requirements for stable roadbed support. At the same time, the prefabricated box-shaped module 2 is hollow in the second horizontal direction, which is the same as the direction of water flow, forming a through water passage, which meets the requirements of speed, stability and water passage during temporary rapid repair. Meanwhile, when switching from the temporary rapid repair structure to the permanent solidification structure, the reused structure can be directly used. Only the temporary repair road surface 5 needs to be removed, which meets the requirements of efficient connection and high construction efficiency. The temporary rapid repair structure can be reused in the permanent solidification structure at a very high ratio, saving a lot of construction and demolition costs and having good economic benefits.

[0030] The temporary-to-permanent repair structure of this application solves the problems of easy damage during temporary emergency repairs, long construction period for permanent repairs, disconnect between new and old structures, and high rework costs in traditional processes. It achieves the dual goals of rapid emergency repair and traffic maintenance during the flood season for flood-damaged roadbeds in mountainous areas and low-cost permanent solidification and durability maintenance after the flood season. It relies on shared steel pipe piles and prefabricated box-type modules to form a skeleton, realizing integrated structural connection, significantly improving the roadbed's resistance to water damage and long-term load-bearing stability, and reducing the overall repair cost.

[0031] like Figure 1 and Figure 6 As shown, in one embodiment, the reuse structure further includes a multi-layer cable mesh structure, with at least two layers of prefabricated box-type modules 2 between adjacent cable mesh structures.

[0032] Each layer of cable net structure includes several fastening sleeves 11 and several cable nets 3; the fastening sleeves 11 are fitted onto the steel pipe piles 1, and at least two perforated steel ribs 12 are reserved on the outside of each fastening sleeve 11; several cables 13 are connected horizontally and vertically to the perforated steel ribs 12.

[0033] It is worth noting that, Figure 6 The fastening sleeve 11 in the diagram only shows two symmetrical perforated steel ribs 12. In fact, the fastening sleeve 11 has four perforated steel ribs 12, which are used to connect the two sides into a horizontal and vertical network through the cable 13.

[0034] Specifically, the fastening sleeve 11 is fixed to the steel pipe pile 1 by bolts, and the connecting part is a vertical rib with holes welded on the outside.

[0035] The temporary-to-permanent repair structure of this application embodiment also includes a multi-layer cable net structure, which connects the steel pipe piles into a mesh-like whole, forming a synergistic force-bearing system and enhancing the stability of the entire structure.

[0036] like Figure 4 and Figure 5 As shown, in one embodiment, the prefabricated box-type module 2 has a hollow frame structure. The prefabricated box-type module 2 is prefabricated using lightweight high-strength reinforced concrete. A central circular hole 10 is provided in the vertical center of the module to be used to fit the steel pipe pile 1. The central circular hole 10 of the module is used to fit the steel pipe pile 1.

[0037] A rectangular protrusion 8 is provided at the center of the top surface of the prefabricated box-shaped module 2, and a rectangular groove 9 is provided at the corresponding position at the center of the bottom surface. The positioning and fitting structure is formed by the cooperation of the rectangular protrusion 8 and the rectangular groove 9 of two adjacent prefabricated box-shaped modules 2. Specifically, as shown... Figure 5 As shown, the rectangular protrusion 8 and the rectangular groove 9 fit together to achieve a seamless vertical connection between modules.

[0038] A wedge-shaped protrusion 6 is provided on one side of the prefabricated box-shaped module 2, and a wedge-shaped groove 7 is provided on the other symmetrical side. The wedge-shaped interlocking structure is formed by the cooperation of the wedge-shaped protrusion 6 and the wedge-shaped groove 7 of two adjacent prefabricated box-shaped modules 2 in the first horizontal direction. Specifically, as shown in... Figure 4 As shown, the wedge-shaped protrusion 6 and the wedge-shaped groove 7 are wedge-shaped and locked together, achieving seamless connection between modules in the first horizontal direction.

[0039] Specifically, all prefabricated box-shaped modules 2 are hollowed out in the same horizontal second direction as the water flow direction to form a water passage, which can prevent secondary damage.

[0040] Preferably, the prefabricated box-type module 2 is prefabricated using C30 lightweight high-strength reinforced concrete.

[0041] The temporary-to-permanent repair structure of this application embodiment reuses several prefabricated box-shaped modules 2 in the structure. The rectangular protrusions 8 and rectangular grooves 9 of two adjacent prefabricated box-shaped modules 2 form a positioning and fitting structure, and the wedge-shaped protrusions 6 and wedge-shaped grooves 7 of two adjacent prefabricated box-shaped modules 2 in the first horizontal direction form a wedge-shaped fitting structure, realizing seamless connection between modules and forming a reliable, water-passing, and directly reusable temporary roadbed support body, laying the foundation for temporary-to-permanent conversion.

[0042] like Figure 7 As shown, in one embodiment, the permanently cured structure further includes a road surface steel mesh and several steel cages, each of which is housed within a number of steel pipe piles 1 and contained within the concrete pouring body of the pile.

[0043] Specifically, steel pipe pile 1 is first inserted into the reinforcing cage, and then the concrete pouring body inside the pile is poured.

[0044] The road surface steel mesh connects all the steel cages into a whole and is embedded in the permanently cured road surface 14.

[0045] Specifically, the road surface steel mesh not only connects all the steel cages into one, but also serves as part of the permanently solidified road surface 14, making the road surface more reliable and forming the overall structure for permanent roadbed repair.

[0046] Preferably, in the road surface reinforcement mesh, at least two steel bars connect adjacent steel cages, and the spacing between the two steel bars is 15~20cm (corresponding to the outer diameter of the steel pipe pile 30cm). The steel pipe pile 1 is inserted into the steel cage 15, and the steel bars in the road surface reinforcement mesh 16 are bent downward and tied to the longitudinal bars of the steel cage 15.

[0047] The permanent hardened pavement 14 and the concrete pouring body inside each steel pipe pile 1 are made of C35 impermeable high-strength concrete. The pouring thickness matches the roadbed design elevation and completely wraps all the steel pipe pile skeletons to form an integrated permanent load-bearing structure of pile-net-concrete.

[0048] Furthermore, the dimensions of a single prefabricated box-type module 2 are 100cm × 100cm × 50cm, with the length and width dimensions matching the spacing of the arrayed steel pipe piles. The steel pipe piles are made of seamless steel pipes with an outer diameter of 30cm. If the base layer below the slide is soil, the pile embedment depth is no less than 1.5m. If the base layer below the slide is rock, the pile embedment depth is no less than 0.8m, and the upper height matches the design thickness of the roadbed repair. The arrayed steel pipe piles are spaced 1.0m apart, and the array area covers the entire collapsed and damaged area of ​​the roadbed, without being removed throughout the entire process.

[0049] Furthermore, the precast box-type module 2 is precast and cast using lightweight high-strength reinforced concrete, with the diameter of the central circular hole being 2-3 cm larger than the outer diameter of the steel pipe pile 1; the wedge-shaped protrusions 6 and wedge-shaped grooves 7 on both sides of the precast box-type module 2 are integrated precast structures with a wedge inclination angle of 15-20°, and the interlocking gap is filled with waterproof mortar, so the precast box-type module 2 is not removed throughout the process.

[0050] The temporary-to-permanent repair structure of this application is divided into a temporary rapid clearance structure before conversion and a permanent curing structure after conversion, which share the same steel pipe pile 1 load-bearing frame.

[0051] Steel pipe pile 1 uses Φ300mm seamless steel pipe, arranged in an array with a pile spacing of 1.0m. If the base layer below the sliding bed is soil, the pile embedment depth shall not be less than 1.5m; if the base layer below the sliding bed is rock, the pile embedment depth shall not be less than 0.8m. The entire process is retained and reused.

[0052] The precast box-type module 2 is precast using C30 lightweight high-strength reinforced concrete, with dimensions of 100cm×100cm×50cm. A central circular hole 10 with a diameter of 310mm is opened in the center of the module, which is inserted into the steel pipe pile 1. The precast box-type module 2 has an integrated wedge-shaped protrusion 6 and a wedge-shaped groove 7 on the left and right sides, with a wedge inclination angle of 18°. The precast box-type module 2 has a rectangular protrusion 8 and a rectangular groove 9 at the top and bottom ends.

[0053] The prefabricated box-shaped modules 2 are precisely fitted together, and the gaps are filled with quick-setting mortar pouring layer 4. After every two layers of modules are assembled, Φ16mm galvanized steel strand cables 13 are used to horizontally and vertically connect all steel pipe piles 1. The cables 13 are connected by fastening sleeves 11 outside the steel pipe piles 1 to form a mesh-like temporary structure. The hollow area of ​​the prefabricated box-shaped modules 2 forms a water passage in the same direction as the water flow. The base is also leveled by quick-setting mortar pouring layer 4. The top is paved with temporary emergency repair road surface 5 to form a temporary rapid clearance structure.

[0054] The temporary road surface 5 is demolished, a steel cage 15 is inserted into the steel pipe pile 1, a road surface steel mesh 16 is laid, the longitudinal bars of the road surface steel mesh 16 are bent down and tied or welded to the longitudinal bars of the steel cage 15, and C35 high-strength concrete is poured into the steel pipe pile 1 and the road surface as a whole to form a cast-in-place concrete permanent curing road surface 14, switching to a permanent curing structure.

[0055] like Figure 8 As shown, in a second aspect, this application discloses an embodiment of a method for the temporary-to-permanent repair of water-damaged roadbeds, which includes a temporary rapid reopening stage and a permanent curing stage.

[0056] The temporary rapid reopening phase includes: S11: Several steel pipe piles 1 are implanted into the stable base layer of the roadbed in a vertical array; several steel pipe piles 1 serve as a load-bearing skeleton shared by the temporary to permanent repair structure and the permanent curing structure.

[0057] S12: Several prefabricated box-shaped modules 2 are sequentially nested within steel pipe piles 1. Each prefabricated box-shaped module 2 is vertically nested within a steel pipe pile 1. Two vertically adjacent prefabricated box-shaped modules 2 are interlocked by a positioning and fitting structure. Two horizontally adjacent prefabricated box-shaped modules 2 are locked together by a wedge-shaped fitting structure. All prefabricated box-shaped modules 2 are hollow and connected in the horizontal second direction, which is the same as the water flow direction, forming a through-type water passage. If the prefabricated box-shaped modules 2 are involved, they constitute the main temporary support structure of the roadbed.

[0058] A number of steel pipe piles 1 and a number of prefabricated box-type modules 2 are combined to form a reusable structure.

[0059] S13: Lay a temporary emergency road surface 5 to form a temporary rapid clearance structure for vehicles and pedestrians to pass through.

[0060] The permanent curing stage includes: S14: Remove temporary road surface repair 5; S15: High-strength concrete is poured into the pavement layer and inside all steel pipe piles 1 to form a concrete pouring body inside the piles and a permanently cured pavement 14, thereby forming a permanently cured structure.

[0061] Preferably, C35 high-strength concrete is poured into the interior of all steel pipe piles 1 and the road surface layer.

[0062] The temporary-to-permanent repair method of this application embodiment is divided into two stages: a temporary rapid reopening stage and a permanent curing stage. Several steel pipe piles 1 and several prefabricated box-type modules 2 constructed in the temporary rapid reopening stage can be used permanently. The temporary road surface 5 constructed in the temporary rapid reopening stage is used temporarily. In the permanent curing stage, only the temporary road surface 5 needs to be removed, and then high-strength concrete is poured into the road surface layer and the interior of all steel pipe piles 1 to form the concrete pouring body inside the piles and the permanently cured road surface 14. This temporary-to-permanent repair method of this application embodiment takes into account both emergency and permanent needs, and features a unique two-stage construction system. During the flood season, it can be quickly assembled and opened to traffic immediately to withstand the impact of flash floods. After the flood season, there is no need to remove the core components; only the temporary road surface 5 needs to be removed, and then permanent curing can be completed by pouring concrete. This meets the requirements of speed, stability, and water flow for temporary rapid reopening. The temporary rapid reopening structure can be reused in a high proportion in the permanent curing structure, achieving efficient connection between temporary rapid reopening during the flood season and permanent curing after the flood season.

[0063] Furthermore, in one embodiment, step S11 is preceded by: Based on the extent of the collapse of the water-damaged roadbed, on-site pretreatment was carried out to prepare the work surface for construction. Specifically, on-site pretreatment includes: manually cleaning loose soil, washed debris and loose gravel on the slope in the roadbed collapse area with the help of small machinery; thoroughly removing silt and water from the base; repairing the outline of the collapsed base; leveling and compacting the soft soil layer of the base; removing water and silt from the base; ensuring that the construction base is dry and firm; and ensuring that the construction area is free of debris and soft, loose soil.

[0064] Step S11 also includes: Based on the target stress requirements of steel pipe pile 1, a number of steel pipe piles 1 are arranged in an array within the collapse area using a line-layout positioning method. If the base layer below the collapse area is soil, vibratory pile driving equipment will be used to vertically implant steel pipe piles 1 into the stable soil layer below the collapse area to a depth of not less than 1.5m, ensuring that the piles are vertical and the embedment depth meets the standard. If the base layer below the collapse area is rock, a core drill with an outer diameter of 30cm will be used to excavate a foundation pit, and steel piles will be vertically embedded to a depth of not less than 0.8m. All steel pipe piles 1 will be retained throughout the entire process as a permanent load-bearing framework.

[0065] After the pile driving is completed, the gaps around the pile are filled with quick-setting mortar to ensure that the pile body does not shift or shake, thus meeting the accuracy requirements for permanent pile foundation construction.

[0066] Preferably, after step S11 and before step S12, the following is included: A 20cm thick layer of fast-setting mortar was laid in the collapsed area inside the steel pipe pile array 1 to form a base leveling layer, ensuring uniform stress distribution during module laying.

[0067] In step S11, if the base layer below the collapse area is soil, after the steel pipe pile 1 is implanted, the soil around the pile is backfilled and compacted to prevent the pile from shaking or shifting, ensuring the vertical bearing capacity and overturning resistance of the pile, and ensuring that the pile construction accuracy meets the standards for permanent pile foundations. If the base layer below the collapse area is rock, after the steel pipe pile is implanted, the gaps around the pile are filled with early-strength mortar to prevent the pile from shaking or shifting, ensuring that the pile is vertically upright.

[0068] Furthermore, in one embodiment, step S12 further includes: For every two layers of prefabricated box-type modules 2 laid, a layer of cable net 3 is installed. Specifically, each layer of cable net 3 includes several fastening sleeves 11 and several cables 13; the fastening sleeves 11 are fitted and fixed to the steel pipe piles 1, and at least two perforated steel ribs 12 are reserved on the outside of each fastening sleeve 11; the cables 13 are connected horizontally and vertically to the perforated steel ribs 12.

[0069] The number of layers can be set to two or three.

[0070] Preferably, the cable 13 needs to be straightened to retain 100N of prestress, ensuring that the temporary overall structure is subjected to uniform stress and forming a stable mesh constraint system to resist water flow impact and temporary vehicle loads.

[0071] The multi-layer cable net 3 in this embodiment can tie the steel pipe piles into a mesh-like whole, forming a synergistic force-bearing system and enhancing the stability of the entire structure.

[0072] Specifically, in one example, after every two layers of prefabricated box-type modules 2 are assembled, the steel pipe pile 1 is nested with a fastening sleeve 11, the tension cable is passed through the reserved round holes of all the vertical ribs of the sleeve, a symmetrical tensioning process is adopted, the tension stress is 100N, and the locking head is tightened to form an overall mesh constraint structure.

[0073] Furthermore, in one embodiment, before step S12, the following steps are also included: Several precast box-type modules 2 are precast; the precast box-type module 2 has a hollow frame structure, with a central circular hole 10 in the vertical center for inserting steel pipe piles 1; a rectangular protrusion 8 is set in the center of the top surface of the precast box-type module 2, and a rectangular groove 9 is set in the corresponding position in the center of the ground; a wedge-shaped protrusion 6 is set on one side of the precast box-type module 2, and a wedge-shaped groove 7 is set on the other symmetrical side. Step S12 also includes: Two vertically adjacent prefabricated box-shaped modules 2 are connected by a positioning and fitting structure formed by rectangular protrusions 8 and rectangular grooves 9. Two horizontally adjacent prefabricated box-shaped modules 2 are locked to each other by a wedge-shaped fitting structure formed by wedge protrusions 6 and wedge grooves 7.

[0074] In this embodiment, seamless connection between modules is achieved in the vertical and horizontal first directions, forming a reliable, water-passing, and directly reusable temporary roadbed support structure, laying the foundation for converting temporary to permanent structures.

[0075] Specifically, after each layer of prefabricated box-type modules 2 is assembled, the flatness is finely adjusted to ensure the overall structure is regular. A layer of cable net 3 is set after every two layers of prefabricated box-type modules 2 are laid.

[0076] Two adjacent prefabricated box-shaped modules 2 are precisely fitted together by protrusions and recesses, and the gaps are sealed with waterproof and erosion-resistant mortar. The upper and lower modules are staggered and assembled, and the flatness is corrected after each layer is assembled to ensure the structure is regular.

[0077] Preferably, step S13 further includes: After the multi-layer modules are assembled and connected, the surface of the top module is leveled, a temporary roadbed layer and a simple road surface layer are laid, the slope outline is trimmed, and debris in the water passage is cleared, thus forming a temporary rapid passage structure to complete emergency passage, open emergency traffic, and resist continuous erosion during the flood season.

[0078] Preferably, after step S13 and before step S14, the procedure includes: After the flood season ends and the water damage is completely eliminated, the temporary road surface 5 is dismantled, and debris is cleaned and the base surface is repaired on the remaining steel pipe pile 1 frame and the top surface leveling layer of the precast box module 2. The verticality of the steel pipe piles is checked.

[0079] Furthermore, in one embodiment, step S15 further includes: Install 15 steel reinforcement cages in each of the steel pipe piles; Reinforcing bars are laid between two adjacent reinforcing cages 15 along the first horizontal direction and the second horizontal direction to form a road surface reinforcing mesh 16; the road surface reinforcing mesh 16 extends to the edge of the roadbed repair area; some of the longitudinal bars of the road surface reinforcing mesh 16 are bent downwards and firmly connected to the corresponding longitudinal bars of the reinforcing cage 15 by binding or welding to ensure that the road surface reinforcing mesh 16 and the steel pipe pile form an integral linkage force-bearing skeleton. High-strength concrete is used for monolithic casting, filling the pavement layer and all steel pipe piles 1. The high-strength concrete encases the reinforcing cage 15 and fills the steel pipe piles 1 (compacting in layers during the process), while simultaneously submerging the pavement reinforcing mesh 16, forming an integrated concrete casting body within the piles and a permanently cured pavement 14. Preferably, C35 impermeable high-strength concrete is used for monolithic casting.

[0080] Specifically, even if the outer steel pipe of the steel pipe pile corrodes and is damaged later during construction, the reinforced concrete pile formed by the inner steel cage and the grouting body can still serve as a long-term vertical load-bearing component to ensure structural stability.

[0081] Specifically, in accordance with the standard maintenance, the steel pipe piles, steel mesh, and cast-in-place concrete are solidified into a whole with the original roadbed base, and the steel pipe piles are transformed into a permanent vertical bearing pile foundation structure for the roadbed.

[0082] Specifically, during the pouring of high-strength concrete, it is vibrated and compacted throughout the process to ensure that the concrete completely encapsulates the steel reinforcement cage and mesh inside the steel pipe pile, without any voids or gaps. After the pouring is completed, the concrete is covered with a membrane and watered for curing, with a curing period of no less than 7 days, so that the steel pipe pile, steel mesh, concrete and the original roadbed base are consolidated into one, and the steel pipe pile becomes the core vertical bearing pile of the roadbed.

[0083] Furthermore, in one embodiment, step S12 further includes: After each layer of prefabricated box-type modules 2 is laid, quick-setting mortar is filled into the joints of the wedge-shaped protrusions 6 and wedge-shaped grooves 7 to seal the joints, prevent water from seeping into the base and eroding the soil, and improve the structure's waterproof and erosion resistance.

[0084] Preferably, during the pouring in step S15, the thickness of each concrete layer is controlled at 30-40cm, and the curing period is no less than 7 days, to ensure that the integrated pile-net concrete structure is dense and meets the strength requirements, thus satisfying the requirements for permanent bearing capacity and water resistance of the highway subgrade.

[0085] This application presents a method for the temporary-to-permanent repair of flood-damaged roadbeds, balancing emergency and permanent needs. It features a unique two-stage construction system. During the flood season, the roadbed can be quickly assembled and opened to traffic immediately, resisting the impact of flash floods. After the flood, there is no need to dismantle core components; only the temporary repair pavement 5 needs to be replaced to convert to a permanently cured structure, meeting the requirements of rapid, stable, and water-passing emergency repairs. This allows for efficient transition from temporary emergency repairs during the flood season to permanent curing afterward. Simultaneously, the entire process exhibits excellent drainage and erosion resistance, preventing secondary flood damage. During the temporary repair phase, a continuous water passage in the same direction as the water flow quickly diverts flash floods, preventing water accumulation and foundation erosion. After permanent curing, the entire structure is a solid reinforced concrete pile foundation with extremely strong anti-seepage, erosion, and compressive strength, completely eradicating roadbed flood damage. Furthermore, the temporary-to-permanent repair... The restoration method involves a structure with good overall integrity and progressively improved load-bearing capacity. In the temporary stage, a wedge-shaped interlocking structure with mesh cables is used to form an integrated load-bearing system, meeting the requirements for temporary traffic and erosion resistance. In the permanent stage, steel pipe concrete piles, steel cages, and pavement steel mesh are added and cast in one piece to form a high-strength vertical pile foundation bearing structure and a permanently cured pavement. The load-bearing capacity, settlement resistance, and overturning resistance are greatly improved, meeting the standards for long-term highway traffic. Finally, the temporary-to-permanent repair method is efficient and flexible, adaptable to complex mountainous scenarios. The emergency stage involves fully prefabricated assembly construction without cast-in-place curing procedures, shortening the emergency reopening period by more than 60%. The permanent curing construction relies on the existing formed framework, with simple procedures and fast construction speed, and can be adapted to roadbed damage and subsidence of various sizes and degrees in mountainous areas.

[0086] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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 between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0087] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0088] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A temporary-to-permanent repair structure for flood-damaged roadbeds, characterized in that: The temporary-to-permanent repair structure includes a temporary rapid access structure before conversion and a permanent curing structure before conversion, both of which include reusable structures; the reusable structure includes several steel pipe piles (1) and several prefabricated box-type modules (2). Several steel pipe piles (1) are arranged in a vertical array and are all implanted in the roadbed stable base layer; Each of the prefabricated box-shaped modules (2) is vertically nested in the steel pipe pile (1). Two vertically adjacent prefabricated box-shaped modules (2) are connected by a positioning and fitting structure. Two horizontally adjacent prefabricated box-shaped modules (2) are locked to each other by a wedge-shaped fitting structure. The prefabricated box-shaped modules (2) are hollow in the horizontal second direction, which is the same as the water flow direction. The temporary rapid clearance structure also includes a temporary emergency road surface (5). The permanent curing structure, relative to the temporary rapid clearance structure, removes the temporary emergency road surface (5) and adds at least a permanent curing road surface (14) and a concrete pouring body inside each steel pipe pile (1).

2. The temporary-to-permanent repair structure for water-damaged roadbeds as described in claim 1, characterized in that: The reuse structure also includes multiple layers of cable net (3), with at least two layers of prefabricated box-type modules (2) between two adjacent layers of cable net (3). Each layer of cable net (3) includes several fastening sleeves (11) and several cables (13); the fastening sleeves (11) are fitted onto the steel pipe piles (1), and at least two perforated steel ribs (12) are reserved on the outside of each fastening sleeve (11); the cables (13) are connected horizontally and vertically to the perforated steel ribs (12).

3. A temporary-to-permanent repair structure for water-damaged roadbeds as described in claim 1, characterized in that: The prefabricated box-type module (2) has a hollow frame structure. It is prefabricated using lightweight high-strength reinforced concrete. A central circular hole (10) is set in the vertical center of the module to accommodate the steel pipe pile (1). A rectangular protrusion (8) is provided at the center of the top surface of the prefabricated box-shaped module (2), and a rectangular groove (9) is provided at the corresponding position of the bottom surface; the positioning and fitting structure is formed by the cooperation of the rectangular protrusion (8) and the rectangular groove (9) of two adjacent prefabricated box-shaped modules (2); The prefabricated box-type module (2) has a wedge-shaped protrusion (6) on one side and a wedge-shaped groove (7) on the other symmetrical side. The wedge-shaped interlocking structure is formed by the wedge-shaped protrusion (6) and wedge-shaped groove (7) of two adjacent prefabricated box-type modules (2) in the first horizontal direction.

4. A temporary-to-permanent repair structure for water-damaged roadbeds as described in claim 1, characterized in that: The permanent curing structure also includes a road surface steel mesh (16) and several steel cages (15), which are built into several steel pipe piles (1) and accommodated in the concrete pouring body inside the piles. The road surface steel mesh (16) connects all the steel cages (15) into a whole and is built into the permanently solidified road surface (14).

5. A method for the temporary-to-permanent repair of water-damaged roadbeds, characterized in that, Includes the following steps: S11: Several steel pipe piles (1) are implanted into the roadbed stable base in a vertical array manner; S12: Several prefabricated box-shaped modules 2 are sequentially nested in the steel pipe pile 1. Each prefabricated box-shaped module (2) is vertically nested in the steel pipe pile (1). Two vertically adjacent prefabricated box-shaped modules (2) are connected by a positioning and fitting structure. Two horizontally adjacent prefabricated box-shaped modules (2) are locked to each other by a wedge-shaped fitting structure. All prefabricated box-shaped modules (2) are hollow in the horizontal second direction, which is the same as the water flow direction, to form a through water passage. S13: Lay a temporary emergency repair road surface (5) to form a temporary rapid emergency clearance structure; S14: Remove the temporary road surface repair (5); S15: High-strength concrete is poured into the pavement layer and all steel pipe piles (1) to form a permanently solidified structure.

6. A method for temporary to permanent repair of water-damaged roadbeds as described in claim 5, characterized in that, Step S11 also includes: Based on the extent of the collapse of the water-damaged roadbed, on-site pretreatment was carried out to prepare the work surface for construction. Step S11 also includes: According to the target stress requirements of the steel pipe pile (1), the layout positioning method is adopted to arrange several steel pipe piles (1) in an array within the collapse area. If the base layer below the collapse area is soil, use a vibratory pile driving device to vertically drive the steel pipe pile (1) into the stable soil layer below the collapse area, with an implantation depth of not less than 1.5m; if the base layer below the collapse area is rock, use a core drill with an outer diameter of 30cm to excavate the foundation pit and vertically bury the steel pipe pile (1), with an embedment depth of not less than 0.8m. After the pile driving is completed, the gaps around the pile are filled with quick-setting mortar.

7. A method for temporary to permanent repair of water-damaged roadbeds as described in claim 5, characterized in that, Step S12 also includes: For each set number of prefabricated box-type modules (2) with no less than two layers laid, a layer of cable net (3) is laid; each layer of cable net (3) includes several fastening sleeves (11) and several cables (13); the fastening sleeves (11) are fitted and fixed to the steel pipe piles (1), and at least two perforated steel ribs (12) are reserved on the outside of each fastening sleeve (11); the several cables (13) are connected horizontally and vertically to the perforated steel ribs (12).

8. A method for temporary to permanent repair of water-damaged roadbeds as described in claim 5, characterized in that, Before step S12, the following is also included: Several precast box-shaped modules (2) are precast; the precast box-shaped module (2) has a hollow frame structure, and a central circular hole (10) is set in the vertical center of the module for the steel pipe pile (1) to be inserted; a rectangular protrusion (8) is set in the center of the top surface of the precast box-shaped module (2), and a rectangular groove (9) is set in the corresponding position in the center of the ground; a wedge-shaped protrusion (6) is set on one side of the precast box-shaped module (2), and a wedge-shaped groove (7) is set on the other symmetrical side. Step S12 also includes: Two vertically adjacent prefabricated box-shaped modules (2) are connected by a positioning and fitting structure formed by a rectangular protrusion (8) and a rectangular groove (9). Two horizontally adjacent prefabricated box-shaped modules (2) are locked to each other by a wedge-shaped protrusion (6) and a wedge-shaped groove (7).

9. A method for temporary to permanent repair of water-damaged roadbeds as described in claim 5, characterized in that, Step S15 also includes: Reinforcing cages were placed in all the steel pipe piles (15); Reinforcing bars are laid between two adjacent reinforcing cages (15) along the first horizontal direction and the second horizontal direction to form a road surface reinforcing mesh (16); the road surface reinforcing mesh (16) extends to the edge of the roadbed repair area; some of the longitudinal bars of the road surface reinforcing mesh (16) are bent downwards and firmly connected to the corresponding longitudinal bars of the reinforcing cage (15) by binding or welding. The pavement layer and all steel pipe piles (1) are integrally cast with high-strength concrete. The high-strength concrete wraps around the steel cage (15) and fills the steel pipe piles (1), while submerging the pavement steel mesh (16), forming an integral concrete casting body inside the pile and a permanently cured pavement (14).

10. A method for temporary to permanent repair of water-damaged roadbed as described in claim 8, characterized in that, Step S12 also includes: After each layer of prefabricated box-type modules (2) is laid, quick-setting mortar is filled into the joints of the wedge-shaped protrusions (6) and wedge-shaped grooves (7) to seal the joints.

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