Prefabricated rollable composite pavement and construction method thereof

Abstract

The invention discloses a prefabricated rollable composite pavement and a construction method thereof, and relates to the technical field of road engineering.The prefabricated rollable composite pavement comprises a roadbed, a base layer, a grouting gravel leveling layer, a concrete surface layer, a bonding layer and a rollable asphalt functional layer, the base layer is laid on the roadbed, and grouting pipes are embedded in the two sides of the extending direction of the base layer; the grouted broken stone leveling layer comprises broken stones laid on the base layer and slurry for filling broken stone gaps; the concrete surface layer comprises a plurality of spliced prefabricated concrete plates, and the prefabricated concrete plates are provided with co-reinforcement assemblies used for hoisting and splicing; the bonding layer is coated on the top surface of the precast concrete plate; the rollable asphalt functional layer is combined with the prefabricated concrete plates through the bonding layer, and the rollable asphalt functional layer can cover gaps between the prefabricated concrete plates. The prefabricated rollable composite pavement provided by the invention is high in construction efficiency and durable and reliable in structure.

Description

Technical Field

[0001] This invention relates to the field of road engineering technology, specifically to a prefabricated rollable composite pavement and its construction method. Background Technology

[0002] In the field of road construction and maintenance, improving construction efficiency, ensuring project quality, extending service life, and reducing interference with traffic and the social environment are the core and enduring goals.

[0003] Existing technologies are mainly developing along two main paths: First, traditional asphalt pavement based on on-site wet-laying methods, where asphalt mixtures are mixed, laid, and compacted on-site to form the surface layer. This technology is mature, and its finished pavement offers advantages such as comfortable driving, no longitudinal construction joints, and good overall sealing and waterproofing. Second, precast concrete pavement oriented towards rapid assembly, where the concrete surface layer is prefabricated into slabs in a factory and transported to the site for rapid assembly. This model achieves rapid and industrialized construction, significantly shortening on-site operation time and reducing interference. Both of these technological paths have inherent technical bottlenecks. While traditional on-site paved asphalt pavement provides good driving comfort and overall sealing, it suffers from low construction efficiency, large quality fluctuations, and significant environmental interference. While precast concrete slab-based assembled pavement enables rapid construction, the presence of numerous joints makes it unable to effectively prevent rainwater infiltration, and its poor driving comfort severely limits its application in high-grade roads.

[0004] Therefore, current road surfaces face the technical challenge of balancing construction efficiency, driving comfort, and durability. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a prefabricated rollable composite pavement and its construction method, thereby solving the technical problem in the prior art that it is difficult to balance the relationship between construction efficiency, driving comfort and durability of pavement.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a precast flexible composite pavement, which includes a subgrade, a base course, a grouting and leveling layer, a concrete surface layer, a bonding layer, and a flexible asphalt functional layer. The base course is laid on the subgrade, and grouting pipes are pre-embedded on both sides of the base course in its extension direction. The grouting and leveling layer includes crushed stone laid on the base course and grout filling the gaps between the crushed stone. The concrete surface layer includes multiple spliced ​​precast concrete slabs, and the precast concrete slabs are provided with reinforced components for hoisting and splicing. The bonding layer is applied to the top surface of the precast concrete slabs. The flexible asphalt functional layer is bonded to the precast concrete slabs through the bonding layer, and the flexible asphalt functional layer can cover the gaps between the precast concrete slabs.

[0008] In some embodiments, the base course includes a grouting subbase and a grouting base course. The grouting subbase is laid on the roadbed, and the particle size of the grouting subbase is larger than that of the grouting base course. The particles include one or more of recycled construction waste aggregate and crushed stone.

[0009] In some embodiments, the thickness of the grouting crushed stone leveling layer is between 80mm and 150mm. The grouting crushed stone leveling layer includes continuously graded crushed stone with a particle size of 5mm to 20mm and cement-based grout mixed with fly ash and mineral powder. The cement-based grout densely fills the gaps between the crushed stone.

[0010] In some embodiments, the thickness of the precast concrete slab is between 160mm and 250mm, and the top surface is roughened to form a rough interface. The precast concrete slab contains 10%-15% (by weight) of rubber particles.

[0011] In some embodiments, the reinforced assembly includes a plurality of threaded steel bars, one end of which protrudes from the wall of the precast concrete slab to form a steel bar connection end, and the steel bar connection end is provided with a straight thread for connection.

[0012] In some embodiments, the steel reinforcement connection ends of two adjacent precast concrete slabs are connected by a detachable connector, and the steel reinforcement connection ends are provided with elastic sealing rubber plugs for sealing.

[0013] In some embodiments, the rollable asphalt functional layer includes a geotextile substrate and an asphalt mixture layer, wherein the asphalt mixture layer is laid and compacted on the geotextile substrate.

[0014] In some embodiments, the asphalt mixture layer comprises high-toughness modified asphalt or high-viscoelastic modified asphalt, and the asphalt mixture layer incorporates 0.2%-0.4% (by weight) of lignin fiber or basalt fiber.

[0015] Secondly, the present invention also provides a construction method for a precast flexible composite pavement. The construction method is applied to the aforementioned precast flexible composite pavement and includes: spreading and compacting the base course, and performing grouting operations on both sides of the base course in the extension direction; laying crushed stone and grouting to form a grouting crushed stone leveling layer; hoisting and laying precast concrete slabs to form a concrete surface layer; spraying modified asphalt or epoxy resin onto the precast concrete slabs to form an adhesive layer; and spreading a flexible asphalt functional layer.

[0016] In some embodiments, the process of hoisting and laying precast concrete slabs to form a concrete surface layer includes: hoisting the precast concrete slabs and placing them on a grouting and leveling layer; connecting the reinforcing bar ends of two adjacent precast concrete slabs with detachable connectors and grouting them with filler material; and installing elastic sealing rubber plugs above the reinforcing bar ends.

[0017] Compared with existing technologies, this invention provides a precast flexible composite pavement where the concrete surface layer and the flexible asphalt functional layer can be precast in a factory, achieving industrialization and standardization of the construction process. This significantly improves construction speed, ensures stable product quality, and reduces on-site pollution and traffic disruption, solving the technical problems of low construction efficiency, difficulty in guaranteeing quality, and significant environmental impact of traditional asphalt pavements. Simultaneously, through the composite structure of a rigid concrete surface layer and a flexible flexible asphalt functional layer, the continuous and seamless flexible asphalt functional layer, precast in the factory and laid on-site, completely covers and seals all joints of the underlying precast concrete slabs, fundamentally blocking water seepage paths and providing a smoother, more comfortable, and lower-noise driving surface. This overcomes the dual defects of poor waterproofing and poor driving comfort caused by numerous joints in traditional precast concrete pavements. Therefore, the precast flexible composite pavement provided by this invention has high construction efficiency and a durable and reliable structure. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of a prefabricated rollable composite pavement provided by an embodiment of the present invention; Figure 2 This is a schematic diagram of the hoisting and paving of precast concrete slabs provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure for installing an elastic sealing rubber plug on a concrete surface layer according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a flexible asphalt functional layer paving provided in an embodiment of the present invention; Figure 5 This invention provides a schematic diagram of the construction process for prefabricated, rollable composite pavement. Figure 1 ; Figure 6 This invention provides a schematic diagram of the construction process for prefabricated, rollable composite pavement. Figure 2 .

[0019] Explanation of reference numerals in the attached figures: 100. Precast rollable composite pavement; 110. Roadbed; 120. Base course; 121. Grouting subbase course; 122. Grouting base course; 130. Grouting and leveling layer with crushed stone; 140. Concrete surface layer; 141. Precast concrete slab; 142. Elastic sealing rubber plug; 150. Adhesive layer; 160. Flexible asphalt functional layer; 200. Construction methods. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] In the field of road construction and maintenance, improving construction efficiency, ensuring project quality, extending service life, and reducing interference with traffic and the social environment are the core objectives. Traditional on-site paving of asphalt pavement suffers from low construction efficiency, large quality fluctuations, and significant environmental impact; prefabricated pavement, with precast concrete slabs as its core, cannot effectively prevent rainwater infiltration due to numerous joints and has poor driving comfort, seriously affecting its application in high-grade roads.

[0022] Currently, there is no mature solution that can systematically combine the high efficiency and high quality advantages of factory prefabrication with the excellent driving comfort and seamless waterproof sealing properties of flexible asphalt pavement.

[0023] To address the technical challenge of balancing construction efficiency, driving comfort, and durability in road surfaces, this invention provides a precast rollable composite pavement and its construction method. The precast rollable composite pavement provided by this invention offers high construction efficiency and a durable and reliable structure.

[0024] It should be noted that the prefabricated rollable composite pavement provided by this invention is used for, but not limited to, high-grade highways. For ease of explanation, this invention will only use the application of prefabricated rollable composite pavement to high-grade highways as an example. The principle of applying prefabricated rollable composite pavement to other types of roads (urban roads, rural roads) is essentially the same as that applied to high-grade highways, and will not be elaborated here.

[0025] This application provides a prefabricated, rollable composite pavement 100, such as... Figure 1 As shown, the precast flexible composite pavement 100 includes a roadbed 110, a base course 120, a grouting crushed stone leveling layer 130, a concrete surface layer 140, a bonding layer 150, and a flexible asphalt functional layer 160. The base course 120 is laid on the roadbed 110, and grouting pipes are pre-embedded on both sides of the base course 120 in its extension direction. The grouting crushed stone leveling layer 130 includes crushed stone laid on the base course 120 and grout filling the gaps between the crushed stone. The concrete surface layer 140 includes multiple spliced ​​precast concrete slabs 141, and the precast concrete slabs 141 are provided with reinforced components for hoisting and splicing. The bonding layer 150 is applied to the top surface of the precast concrete slabs 141. The flexible asphalt functional layer 160 is bonded to the precast concrete slabs 141 through the bonding layer 150, and the flexible asphalt functional layer 160 can cover the gaps between the precast concrete slabs 141.

[0026] Roadbed 110 refers to a strip-shaped structure constructed according to the route location and certain technical requirements, serving as the foundation for the pavement. Alternatively, it refers to a strip-shaped structure constructed according to the road route location and cross-sectional requirements, which is the foundation of the pavement structure and bears the traffic load transmitted from the pavement.

[0027] The base course 120 is laid on top of the subgrade 110 and is a structural layer located beneath the asphalt pavement layer or cement concrete pavement. It can be composed of a non-bonded mixture such as coarse and fine crushed stone. Its function is to distribute vehicle loads and support the pavement surface layer. The materials must meet the requirements for strength, stability, and durability. Grouting is used to fill the gaps in the crushed stone through grouting pipes pre-embedded on both sides of the base course 120. For example, the base course 120 can be a single-layer structure or a double-layer structure, as will be described later through specific embodiments.

[0028] The grouting and crushed stone leveling layer 130 is a structural layer placed between the surface layer and the base layer 120 in road engineering. Its main functions are to adjust the road surface smoothness and transfer vehicle loads to the underlying structure. The thickness and material of the grouting and crushed stone leveling layer 130 can be determined according to actual needs, which will be described later through specific embodiments.

[0029] Concrete surface layer 140 is the core load-bearing layer of the pavement structure, such as Figure 2 As shown, the concrete surface layer 140 includes multiple spliced ​​precast concrete slabs 141, which are sequentially laid on the grouting and leveling layer 130 using hoisting equipment. Precast concrete slabs 141 have pre-embedded reinforcing components, such as steel bars, inside. The number of steel bars can be determined according to requirements; for example, the steel bars extend along the length of the precast concrete slab 141; for example, the steel bars extend along the width of the precast concrete slab 141. The steel bars can be used for hoisting the precast concrete slabs 141 and connecting adjacent precast concrete slabs 141, as will be described later through specific embodiments.

[0030] The adhesive layer 150 is applied to the top surface of the precast concrete slab 141. For example, in order to achieve better bonding, the adhesive layer 150 is applied to the top surface of the roughened precast concrete slab 141. The material of the adhesive layer 150 is SBS modified asphalt or epoxy resin. The SBS modified asphalt is made from base asphalt with a certain proportion of SBS (styrene-butadiene-styrene triblock copolymer) modifier added. The application rate depends on the actual needs. For example, the application rate is 0.5-0.8 kg / m².

[0031] The rollable asphalt functional layer 160 is bonded to the precast concrete slab 141 through the adhesive layer 150. After the rollable asphalt functional layer 160 wears down, it can be partially cut off and removed, and new roll material can be laid, achieving rapid maintenance and renewal of the road. The specific structure and materials will be described in detail below.

[0032] In this embodiment, the concrete surface layer 140 and the flexible asphalt functional layer 160 can be prefabricated in a factory, realizing the industrialization and standardization of the construction process. This significantly improves construction speed, ensures stable product quality, and reduces on-site pollution and traffic interference, solving the technical problems of low construction efficiency, difficulty in guaranteeing quality, and significant environmental impact of traditional asphalt pavement. Simultaneously, through the composite structure of the rigid concrete surface layer 140 and the flexible flexible asphalt functional layer 160, the continuous and seamless flexible asphalt functional layer 160, prefabricated in the factory and laid on-site, completely covers and seals all joints of the underlying prefabricated concrete slabs 141, fundamentally blocking water seepage paths and providing a smoother, more comfortable, and lower-noise driving surface. This overcomes the dual defects of poor waterproofing and poor driving comfort caused by numerous joints in traditional prefabricated concrete pavements. Therefore, the prefabricated flexible composite pavement provided by this invention has high construction efficiency and a durable and reliable structure.

[0033] In some embodiments, such as Figure 1 As shown, the base course 120 includes a grouting subbase course 121 and a grouting base course 122. The grouting subbase course 121 is laid on the roadbed 110. The particle size of the grouting subbase course 121 is larger than that of the grouting base course 122. The particles include one or more of recycled construction waste aggregate and crushed stone.

[0034] In this embodiment, the base course 120 adopts a double-layer composite foundation. The grouting subbase 121 is a large-particle-size grouting subbase, and the grouting base course 122 is a small-particle-size grouting base course, with the grouting base course 122 located above the grouting subbase 121. On the treated subgrade 110, the large-particle-size graded crushed stone subbase and the small-particle-size graded crushed stone base course containing recycled aggregate are spread and compacted, and grouting pipes are pre-embedded at the longitudinal edges on both sides. Grouting is carried out until the grout evenly seeps out from the top surface of the crushed stone layer. By adopting a layered design for the base course 120, the differential particle size combination of the two layers significantly improves the load-bearing capacity and integrity of the base course 120. Furthermore, the use of recycled aggregate or crushed stone from construction waste realizes the resource utilization of waste, reduces raw material costs, and solves the problems of high dependence on natural raw materials and low solid waste utilization rate in existing technologies. This reduces the environmental burden throughout the entire life cycle, while enhancing the base course 120's resistance to settlement and cracking, and extending the service life of the base course.

[0035] In some embodiments, such as Figure 1 As shown, the thickness of the grouting crushed stone leveling layer 130 is between 80mm and 150mm. The grouting crushed stone leveling layer 130 includes continuously graded crushed stone with a particle size of 5mm-20mm and cement-based grout mixed with fly ash and mineral powder. The cement-based grout densely fills the gaps between the crushed stone.

[0036] In this embodiment, the grouting crushed stone leveling layer 130 is laid on the base layer 120. The thickness of the grouting crushed stone leveling layer 130 can be determined according to actual needs, such as 80mm, 90mm, 100mm, 120mm, 130mm, 150mm, or any value between any two adjacent values ​​mentioned above. The grouting crushed stone leveling layer 130 includes continuously graded crushed stone with a particle size of 5mm-20mm. Continuous gradation means that the particle size of the crushed stone is continuously distributed from 5mm to 20mm without gaps, which allows the crushed stone to interlock and form a stable void structure. This ensures the overall compressive strength of the grouting crushed stone leveling layer 130 and provides channels for the grouting material to penetrate and fill. At the same time, high-performance cement-based grouting material mixed with industrial by-products such as fly ash and mineral powder is used to densely fill the gaps and finely level the base layer 120, ensuring that the grouting crushed stone leveling layer 130 is dense and flat, and providing uniform support for the upper precast concrete slab 141, effectively buffering the stress transfer between the base layer 120 and the concrete surface layer 140, and avoiding uneven stress and damage to the concrete surface layer 140.

[0037] In some embodiments, such as Figure 2 and Figure 3 As shown, the thickness of the precast concrete slab 141 is between 160mm and 250mm, and the top surface is roughened to form a rough interface. The precast concrete slab 141 contains 10%-15% (by weight) rubber particles.

[0038] In this embodiment, precast concrete slabs 141 are laid on top of the grouting and leveling layer 130. The thickness of the precast concrete slabs 141 can be determined according to actual needs, such as 160mm, 180mm, 200mm, 220mm, 240mm, 550mm, or any value between two adjacent values ​​mentioned above. The top surface of the precast concrete slabs 141 is mechanically roughened to enhance adhesion to the bonding layer 150 and prevent delamination. The precast concrete slabs 141 contain 10%-15% (by weight) of rubber granules. The rubber granules include, but are not limited to, waste rubber granules, which can improve the impact toughness and noise reduction performance of the precast concrete slabs 141.

[0039] In some embodiments, the reinforced assembly includes a plurality of threaded steel bars, one end of which protrudes from the wall of the precast concrete slab to form a steel bar connection end, and the steel bar connection end is provided with a straight thread for connection.

[0040] In this embodiment, a shared reinforcement assembly is pre-embedded inside the precast concrete slab 141. This shared reinforcement assembly is a lifting and connecting shared reinforcement system, which consists of at least four high-strength threaded steel bars. For example, the threaded steel bars are symmetrically arranged along the length of the precast concrete slab 141. Based on the dimensions of the precast concrete slab 141 and the lifting force calculation, the threaded steel bars can be HRB400 grade steel bars with a diameter of 20mm-28mm. The ends of the steel bars extend out of the wall surface of the precast concrete slab 141 and are machined with straight threads. By using threaded steel bars with straight threads, the splicing of adjacent precast concrete slabs 141 can be completed quickly, ensuring the integrity of the concrete surface layer 140 connection, improving the pavement's resistance to bending and settlement, and facilitating later disassembly and maintenance.

[0041] In some embodiments, such as Figure 3 As shown, the steel bar connection ends of two adjacent precast concrete slabs 141 are connected by detachable connectors, and the steel bar connection ends are provided with elastic sealing rubber plugs 142 for sealing.

[0042] In this embodiment, adjacent precast concrete slabs 141 are mechanically fitted together by protruding steel bar connection ends and detachable connectors. After fitting, the connection area is grouted. The exposed ends of the steel bar connection ends are sealed with elastic sealing rubber plugs 142 to prevent moisture intrusion and steel bar corrosion. The detachable connectors facilitate subsequent slab maintenance and replacement. The sealing structure of the elastic sealing rubber plugs 142 prevents rainwater and debris from entering the connection area, effectively preventing steel bar corrosion, extending the service life of the connection structure, and ensuring the overall stability of the road surface.

[0043] In some embodiments, such as Figure 4 As shown, the rollable asphalt functional layer 160 includes a geotextile base and an asphalt mixture layer, wherein the asphalt mixture layer is laid and compacted on the geotextile base.

[0044] In this embodiment, the rollable asphalt functional layer 160 is bonded to the precast concrete slab 141 via an adhesive layer 150. The rollable asphalt functional layer 160 comprises, from bottom to top, a geotextile substrate and an asphalt mixture layer. Exemplarily, the geotextile substrate is polyester or fiberglass geotextile, serving as a reinforcing load-bearing layer during rolling and paving. Exemplarily, the asphalt mixture layer is a high-toughness asphalt mixture layer, paved and compacted on the geotextile substrate, with a thickness of 20mm-40mm. The aggregate gradation of the asphalt mixture layer is a fine-grained gradation (such as GT-8 or SMA-10) with a particle size not exceeding 10mm to form a dense skeleton structure. The rollable asphalt functional layer adopts a combined structure of geotextile substrate and asphalt mixture layer. The geotextile enhances the tensile and crack resistance of the asphalt layer, while the asphalt mixture layer ensures the pavement's wear resistance and skid resistance. The rollable characteristic facilitates paving and subsequent maintenance, while also enhancing the pavement's waterproofing and damage resistance.

[0045] In some embodiments, the asphalt mixture layer comprises high-toughness modified asphalt or high-viscoelastic modified asphalt, and the asphalt mixture layer incorporates 0.2%-0.4% (by weight) of lignin fiber or basalt fiber.

[0046] In this embodiment, the asphalt mixture layer includes high-toughness modified asphalt or high-viscoelastic modified asphalt, which improves the asphalt layer's resistance to aging and rutting. At the same time, the asphalt mixture layer incorporates 0.2%-0.4% (by weight) of lignin fiber or basalt fiber, such as 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, or any value between any two adjacent values ​​mentioned above, which can enhance the integrity and crack resistance of the asphalt mixture, prevent asphalt layer from peeling off and cracking, and extend the service life of the pavement.

[0047] This application also provides a construction method for prefabricated rollable composite pavement, such as... Figure 5 As shown, construction method 200 is applied to the aforementioned precast flexible composite pavement 100, and construction method 200 includes: Step 210: Spread and compact the base course, and perform grouting operations on both sides of the base course extension direction.

[0048] Specifically, on the prepared roadbed, a large-diameter graded crushed stone subbase and a small-diameter graded crushed stone base course containing recycled aggregate are laid and compacted, and grouting pipes are pre-embedded on both longitudinal edges, and grouting is performed until the grout evenly seeps out from the top surface of the crushed stone layer.

[0049] Step 220: Lay crushed stone and grout to form a grout-grouted crushed stone leveling layer.

[0050] Specifically, after the base layer construction is completed, graded crushed stone is laid on the base layer, and then high-performance cement-based grout is injected to fully fill the voids in the crushed stone, forming a flat and dense grouting crushed stone leveling layer.

[0051] Step 230: Hoist and lay precast concrete slabs to form a concrete surface layer.

[0052] Specifically, after the grouting and leveling layer is completed, precast concrete slabs are laid sequentially on the grouting and leveling layer using hoisting equipment and then spliced ​​together to form the concrete surface layer.

[0053] Step 240: Spray modified asphalt or epoxy resin onto the precast concrete slab to form an adhesive layer.

[0054] Specifically, after the concrete surface layer is constructed, SBS modified asphalt or epoxy resin is evenly sprayed onto the clean, dry, and roughened surface of the precast concrete slabs as a bonding layer, with the spraying amount controlled at 0.5-0.8 kg / m².

[0055] Step 250: Lay the flexible asphalt functional layer.

[0056] Specifically, after the bonding layer is applied, a specialized unwinding machine is used to unwind the precast concrete slabs that have been coated with the bonding layer. Immediately after unwinding, a light roller is used to compact the slabs 2-4 times, ensuring full contact with the bonding layer and final compaction. After filling the joints of the flexible asphalt overlay with sealant, the surface can be opened to traffic.

[0057] It should be noted that the rollable asphalt functional layer can be prefabricated in the factory. For example, the production of the rollable asphalt functional layer includes the following steps: A release agent is evenly applied to the base plate of a dedicated large steel test tank in the factory. A geotextile substrate is laid, ensuring it is flat and tightly adheres to the base plate. A high-toughness asphalt mixture is mixed, controlling the aggregate heating temperature to approximately 190°C and the mixture mixing temperature to approximately 185°C. The mixture is spread on the geotextile substrate, controlling the initial spreading temperature to be no lower than 170°C. A small road roller is used for compaction, controlling the compaction temperature at approximately 165°C, and compacting 4-6 times. During compaction, the high-temperature asphalt will penetrate downwards and fully saturate the geotextile substrate, forming a strong bond. After the mixture cools to room temperature, it is rolled using specialized rolling equipment including a roller, a take-up device, and a pressure plate. First, anchor one end of the rollable asphalt to the drum using a pressure plate. Then, drive the drum at a speed of 0.5-1 rad / s to wind the prefabricated asphalt-geotextile composite layer into a roll. The bending radius can be determined according to the actual situation, as long as it meets the requirement of not causing material cracking.

[0058] In some embodiments, such as Figure 6 As shown, step 230, hoisting and laying precast concrete slabs to form a concrete surface layer, includes: Step 231: Hoist the precast concrete slabs and place them on the grouting crushed stone leveling layer.

[0059] Specifically, after the grouting and leveling layer is completed, precast concrete slabs are laid sequentially on the grouting and leveling layer using hoisting equipment and then spliced ​​together to form the concrete surface layer.

[0060] Step 232: Connect the steel reinforcement ends of two adjacent precast concrete slabs with detachable connectors and grout them with sealant.

[0061] Specifically, detachable connectors are used to connect the protruding steel bars of adjacent precast concrete slabs, and high-performance grouting materials are used for grouting.

[0062] Step 233: Install an elastic sealing rubber plug above the rebar connection end.

[0063] Specifically, elastic sealing rubber plugs are installed above all steel bar connection ends to ensure a waterproof seal.

[0064] In some embodiments, step 230, which involves hoisting and laying precast concrete slabs to form a concrete surface layer, further includes: Step 234: After installing elastic sealing rubber plugs above all the rebar connection ends, clean the top surface of the precast concrete slab. If necessary, perform secondary sandblasting or high-pressure water rinsing to ensure the surface is clean.

[0065] To better understand this invention, the following is combined with... Figures 1 to 6 The technical solution of the present invention will be described in detail below: In some embodiments, the precast flexible composite pavement 100 is constructed using construction method 200. The precast flexible composite pavement 100 includes a subgrade 110, a base course 120, a grouting crushed stone leveling layer 130, a concrete surface layer 140, a bonding layer 150, and a flexible asphalt functional layer 160.

[0066] The base course 120 includes a grouting subbase course 121 and a grouting base course 122. The grouting subbase course 121 is laid on the roadbed 110. The particle size of the grouting subbase course 121 is larger than that of the grouting base course 122. The particles include one or more of recycled construction waste aggregate and crushed stone.

[0067] The grouting crushed stone leveling layer 130 includes continuously graded crushed stone with a particle size of 5mm-20mm and cement-based grout mixed with fly ash and mineral powder. The cement-based grout densely fills the gaps between the crushed stone.

[0068] The concrete surface layer 140 comprises multiple spliced ​​precast concrete slabs 141. The top surface of each precast concrete slab 141 is roughened to create a rough interface. Each precast concrete slab 141 contains 10%-15% (by weight) of rubber granules. The precast concrete slabs 141 are equipped with threaded reinforcing bars for hoisting and splicing. The reinforcing bar connection ends of adjacent precast concrete slabs 141 are connected by detachable connectors, and the connection ends are equipped with elastic sealing rubber plugs 142 for sealing.

[0069] The adhesive layer 150 is applied to the top surface of the roughened precast concrete slab 141.

[0070] The rollable asphalt functional layer 160 includes a geotextile base and an asphalt mixture layer, wherein the asphalt mixture layer is laid and compacted on the geotextile base. The asphalt mixture layer includes high-toughness modified asphalt or high-viscoelastic modified asphalt, and the asphalt mixture layer incorporates 0.2%-0.4% (by weight) of lignin fiber or basalt fiber.

[0071] In this embodiment, the prefabricated rollable composite pavement 100 systematically integrates the advantages of factory prefabrication and high-performance flexible pavement, and has the following beneficial effects: (1) Fast and efficient construction: The main structural layers, including the concrete surface layer 140 and the flexible asphalt functional layer 160, are prefabricated in the factory. Only hoisting, connection and roll material laying are carried out on site, which greatly shortens the construction period and reduces the interference to traffic and the environment.

[0072] (2) Standardized: The factory prefabrication environment is controllable, ensuring high standards and consistency in key indicators such as the strength of precast concrete slab 141, asphalt mixture ratio and compaction degree. Rigid precast concrete slab 141 provides strong load-bearing capacity, and the high-toughness asphalt layer provides excellent driving comfort, skid resistance and noise reduction effect.

[0073] (3) The structure is durable and reliable: the “edge grouting” method enhances the stability of the base layer 120; the “hanging and connecting reinforcement” system and the detachable connectors ensure the integrity between the panels; the rubber particle toughening concrete improves the crack resistance; the elastic sealing rubber plug 142 and the bonding layer 150 enhance the waterproofness and interlayer bonding of the structure.

[0074] (4) Green and environmentally friendly: a large amount of solid waste materials such as recycled aggregates from construction waste, rubber particles, and industrial waste residue can be used in the base layer 120, grouting crushed stone leveling layer 130, grouting material, and precast concrete slabs 141 to realize the resource recycling of road engineering.

[0075] (5) Convenient maintenance and renovation: The precast concrete slab 141 can be replaced by disassembling the connectors. After the upper flexible asphalt functional layer 160 is worn, it can be partially cut off and removed and new roll material can be laid, so as to realize the rapid maintenance and renewal of the road.

[0076] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A prefabricated, rollable composite pavement, characterized in that, include: Roadbed; The base course is laid on the roadbed, and grouting pipes are pre-embedded on both sides of the extension direction of the base course. Grouting and leveling layer, including crushed stone laid on base layer and grout filling the gaps between crushed stone; The concrete surface layer comprises multiple spliced ​​precast concrete slabs, the precast concrete slabs being equipped with reinforced assemblies for hoisting and splicing; An adhesive layer is applied to the top surface of the precast concrete slab; A rollable asphalt functional layer is bonded to the precast concrete slabs through the adhesive layer, and the rollable asphalt functional layer can cover the gaps between the precast concrete slabs.

2. The precast rollable composite pavement according to claim 1, characterized in that, The base course includes a grouting subbase and a grouting base course. The grouting subbase is laid on the roadbed. The particle size of the grouting subbase is larger than that of the grouting base course. The particles include one or more of recycled construction waste aggregate and crushed stone.

3. The prefabricated rollable composite pavement according to claim 1, characterized in that, The thickness of the grouting crushed stone leveling layer is between 80mm and 150mm. The grouting crushed stone leveling layer includes continuously graded crushed stone with a particle size of 5mm to 20mm and cement-based grout mixed with fly ash and mineral powder. The cement-based grout densely fills the gaps between the crushed stone.

4. The precast rollable composite pavement according to claim 1, characterized in that, The thickness of the precast concrete slab is between 160mm and 250mm, and the top surface is roughened to form a rough interface. The precast concrete slab contains 10%-15% (by weight) rubber particles.

5. The precast rollable composite pavement according to claim 4, characterized in that, The reinforced assembly includes multiple threaded steel bars, one end of which protrudes from the wall of the precast concrete slab to form a steel bar connection end, and the steel bar connection end is provided with a straight thread for connection.

6. The precast flexible composite pavement according to claim 5, characterized in that, The steel reinforcement connection ends of two adjacent precast concrete slabs are connected by a detachable connector, and the steel reinforcement connection ends are provided with elastic sealing rubber plugs for sealing.

7. The precast flexible composite pavement according to claim 1, characterized in that, The rollable asphalt functional layer includes a geotextile base and an asphalt mixture layer, wherein the asphalt mixture layer is laid and compacted on the geotextile base.

8. The precast rollable composite pavement according to claim 7, characterized in that, The asphalt mixture layer includes high-toughness modified asphalt or high-viscoelastic modified asphalt, and the asphalt mixture layer incorporates 0.2%-0.4% (by weight) of lignin fiber or basalt fiber.

9. A construction method for a precast flexible composite pavement, wherein the construction method is applied to the precast flexible composite pavement according to any one of claims 1-8, characterized in that, The construction method includes: The base layer is spread and compacted, and grouting is performed on both sides of the base layer along its extension direction. The grouted crushed stone leveling layer is formed by laying crushed stone and grouting it. The precast concrete slabs are hoisted and laid to form the concrete surface layer; The bonding layer is formed by spraying modified asphalt or epoxy resin onto the precast concrete slab; The described flexible asphalt functional layer is paved.

10. The construction method according to claim 9, characterized in that, The process of hoisting and laying the precast concrete slabs to form the concrete surface layer includes: The precast concrete slabs are hoisted and placed on the grouted crushed stone leveling layer; The steel reinforcement ends of two adjacent precast concrete slabs are connected by detachable connectors and grouted with sealant. An elastic sealing rubber plug is installed above the connection end of the reinforcing bar.

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