Long-life roadbed pavement structure and manufacturing method and manufacturing equipment

Abstract

The application discloses a long-service-life roadbed pavement structure and a manufacturing method and manufacturing equipment thereof, relates to the road construction technical field, and adopts fine-grained high-density fluid fiber soil 3D printing and pouring embankment structure, the hardened embankment structure will not be softened due to capillary water rising; the fine-grained high-density fiber concrete is adopted for a pavement base layer and a bottom base layer, so that the bending and splitting strength is greater than 5MPa; the fine-grained high-density fiber concrete 3D printing and pouring with the compressive strength greater than 60MPa, the bending and splitting strength greater than 15MPa is adopted for a surface layer; a 3-5cm-thick high-performance asphalt concrete wearing layer is laid on the surface layer; and the technical effects that the roadbed pavement structure has a long service life, good service performance and a low maintenance frequency are achieved.

Description

Technical Field

[0001] This invention relates to the field of road construction technology, and in particular to a long-life roadbed and pavement structure, its manufacturing method, and manufacturing equipment. Background Technology

[0002] Highway construction, maintenance, and major repairs not only consume a large amount of resources and damage the ecological environment, but also often lead to traffic congestion, greatly reducing road capacity. Therefore, how to improve the service life of roads and eliminate road performance degradation has become a key issue in my country's road engineering research.

[0003] The main reasons for frequent structural damage to road surfaces are as follows: First, during the operation of the embankment, the water content in the subgrade soil will increase over time and gradually soften the stiffness of the subgrade soil. When it is subjected to impact load, it will cause uneven deformation and damage to the pavement structure. Secondly, the water-stabilized crushed stone structure of the subbase and base course of the road has poor bending resistance. At the same time, the water-stabilized crushed stone is formed by heavy rollers. Before it is cured, the internal stress of the water-stabilized crushed stone will gradually be released over time after being rolled by heavy rollers, while the cohesion of concrete will increase over time. When the released stress in the water-stabilized crushed stone structure is greater than the solidification stress, micro-cracks will be generated. When the released stress is less than the solidification stress, the solidification force will wrap the unreleased released stress. This phenomenon makes the water-stabilized crushed stone structure very easy to crack further when the road surface is vibrated and impacted by vehicles. After the water-stabilized crushed stone of the subbase and base course cracks, as the impact force gradually extends from the base upwards, it will eventually form a through crack, which will be reflected to the asphalt concrete surface to form a reflective crack.

[0004] Therefore, a roadbed and pavement structure with a long service life, good performance, and low maintenance frequency is needed. Summary of the Invention

[0005] This application provides a long-life roadbed and pavement structure, which solves the technical problems of short service life, poor service performance, and high maintenance frequency of existing roadbed and pavement structures due to their own structural and material limitations; and achieves the technical effect of long service life, good service performance, and low maintenance frequency of roadbed and pavement structures.

[0006] This application provides a long-life roadbed and pavement structure, which consists of four layers, from top to bottom: a wear layer, a top fiber concrete layer, a bottom fiber concrete layer, and a fluid fiber soil layer, and is constructed by on-site casting. The wear layer is obtained by mixing copolymer asphalt modifier with asphalt, gravel, mineral powder and fiber, and has a thickness of 3cm to 5cm. The top fiber-reinforced concrete layer is made of fine-grained high-density concrete (FHC) with an unconfined compressive strength of ≥60MPa, flexural and splitting strength of ≥15MPa, elongation and shrinkage rate of ≥5% and a thickness of 25cm to 45cm. The bottom fiber concrete layer is made of fine-grained high-density fiber concrete (FHC), with a 28-day unconfined compressive strength of 5 MPa to 10 MPa, a flexural and splitting strength of ≥5.0 MPa, and a thickness of 30 cm to 50 cm. The fluidized fiber soil layer utilizes fine-grained high-density fluidized fiber soil (FHC) and fibers to form a 30cm to 50cm roadbed, with an unconfined compressive strength of 1MPa to 3MPa and a flexural and splitting strength of ≥0.3MPa after 28 days.

[0007] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: By utilizing waste soil to prepare each structural layer, and employing on-site casting for rapid deployment, this application addresses the engineering challenge of short pavement service life caused by dynamic water pressure in the pores of asphalt concrete due to road compaction preloading, capillary rise, and traffic loads. It employs 3D printing of fine-grained high-density fluid fiber soil to construct the embankment structure, ensuring that this hardened embankment structure will not soften due to capillary rise. The subbase layer of the pavement uses fine-grained high-density fiber concrete, guaranteeing flexural and splitting strengths greater than 5 MPa. The surface layer uses fine-grained high-density fiber concrete with compressive strength greater than 60 MPa and flexural and splitting strength greater than 15 MPa, 3D printed and cast. The construction involves laying a 3-5cm thick high-performance asphalt concrete wearing course on top of the surface layer; utilizing fine-grained high-density materials and high-performance pavement materials as road structure materials to address the effects of capillary rise, release of residual stress from pre-compaction, and rutting hydrodynamic pressure, significantly improving road service performance; resulting in a subgrade life of over 100 years and a pavement life of over 40 years; effectively solving the technical problems of short service life, poor service performance, and high maintenance frequency in existing subgrade and pavement structures due to limitations in their own structure and materials; thus achieving the technical effect of long service life, good service performance, and low maintenance frequency in subgrade and pavement structures. Attached Figure Description

[0008] Figure 1 This is a simplified structural diagram of the long-life subgrade and pavement structure of this application; Figure 2 This is a simplified diagram showing the positional relationships of the various components of the manufacturing equipment of this application; Figure 3 A schematic diagram showing the positional relationship between the fiber dispersion component and the injection and blowing component; Figure 4 This is a schematic diagram of the structure of the first dispersed unit; Figure 5 A simplified structural diagram of the container block; Figure 6 A schematic diagram of the external structure of the injection and scattering component; Figure 7 A partial structural diagram of the injection and scattering component; Figure 8 A simplified structural diagram of the injection and dispersing assembly; Figure 9 This is a schematic diagram of the deformation state of the elastic band. Figure 10 This is a schematic diagram of the external structure of the elastic band after deformation. Figure 11 This is a schematic diagram showing the positional relationship between the overlay and the elastic band. Figure 12 A simplified diagram showing the positional relationship between the overlay and the elastic band. Figure 13 This is a schematic diagram showing the positional relationship between the fiber dispersion component and the dipping rotating column.

[0009] In the picture: Wear layer 01, top fiber concrete layer 02, bottom fiber concrete layer 03, fluid fiber soil layer 04, mixing bin 001, inlet 010, outlet 020, mixing assembly 030, fiber silo 100, top pressure plate 110, bottom auger conveyor assembly 120, conveying pipe 130, first dispersion unit 200, carrier frame 210, connecting rod 211, container block 220, block groove 221, top probe groove 222, top drum 231, bottom drum 232, elastic belt body 233, belt protrusion 234, covering belt 235, second dispersion unit 300, top telescopic body 410, material conveying and dispersing pipe 420, foundation pipe 421, inner sleeve 422, bottom air hole 423, outer sleeve 424, side air hole 425, pumping assembly 500, material-coating rotating column 600. Detailed Implementation

[0010] To facilitate understanding of the present invention, a more complete description of this application will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of the present invention.

[0011] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0012] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0013] Example 1

[0014] like Figure 1 As shown, the long-life roadbed and pavement structure of this application consists of four layers, from top to bottom: a wear layer 01, a top fiber concrete layer 02, a bottom fiber concrete layer 03, and a fluid fiber soil layer 04, which are laid out by on-site casting.

[0015] The wear layer 01 is obtained by mixing a copolymer asphalt modifier with asphalt, gravel, mineral powder and fiber, and has a thickness of 3cm to 5cm. The copolymer asphalt modifier is made by mixing one or more of polyvinyl alcohol copolymer (POE), polyethylene (PE) and ethylene-vinyl acetate copolymer (EVA) with rubber, granulating and drying. POE, PE, and EVA all possess high tear resistance, flexural strength, low-temperature flexibility, wear resistance, fatigue resistance, and chemical corrosion resistance. They are environmentally friendly materials, recyclable, and meet environmental protection requirements, causing no pollution to the environment. When blended with rubber, they form asphalt modifiers, which can improve the wear resistance, aging resistance, and fatigue resistance of asphalt wearing course 01, as well as enhance the pavement's resistance to rutting, impact resistance, and low-temperature flexibility, thereby extending the service life of the pavement.

[0016] The formula for the wear layer 01 is as follows: Copolymer asphalt modifier 0.05%-0.5% Asphalt 2%-8% Fiber content: 0.1%-0.5% Mineral powder 1%-5% Pebbles (0mm-3mm) 45%-55% Pebbles (3mm-5mm) 4%-6% Pebbles (5mm-10mm) 7%-10% Gravel (10mm-15mm) 20% to 30% The preparation process (manufacturing method) of the wear layer 01 is as follows: (1) Take one or more of polyvinyl alcohol copolymer (POE), polyethylene (PE), and ethylene-vinyl acetate copolymer (EVA) and mix them with rubber particles to granulate, and dry them at 50°C to prepare copolymer asphalt asphalt modifier. (2) The stones are screened according to the gradation in the formula; the stones are one or more of basalt stones, granite stones, sandstone stones, and quartz stones; (3) Heat the asphalt at 160°C for 4 to 6 hours, add the copolymer asphalt modifier in the specified proportion in the formula, melt it to form copolymer-rubber modified asphalt, continue heating at 160°C, add stones, mineral powder and fiber, stir at 170°C for 4 hours to form asphalt wear layer.

[0017] Preferably, the rubber mentioned above is one or more of styrene-butadiene rubber and chloroprene rubber.

[0018] Preferably, the aforementioned fibers are one or more of polyester fibers, polyacrylonitrile fibers, basalt fibers, and lignin fibers, with a diameter of 20-50 μm and a length of 8 mm-15 mm.

[0019] Preferably, the mineral powder is one or more of limestone powder, slag powder, coal gangue powder and fly ash, and the sieving rate through a 0.15mm sieve is not less than 80%.

[0020] The top fiber-reinforced concrete layer 02 is made of fine-grained high-density concrete (FHC), with a 28-day unconfined compressive strength ≥60MPa, flexural and splitting strength ≥15MPa, elongation and shrinkage rate ≥5%, and a thickness of 25cm to 45cm. The fine-grained material used is waste soil (cutting slope spoil, tunnel spoil, construction and industrial solid waste, roadbed construction clearing spoil, silt, etc.). The mix proportion needs to be calculated by testing the particle size of the waste soil on site and then adjusting the cement dosage.

[0021] The bottom fiber concrete layer 03 is made of fine-grained high-density fiber concrete (FHC), with an unconfined compressive strength of 5 MPa to 10 MPa after 28 days, a flexural and splitting strength of ≥5.0 MPa, and a thickness of 30 cm to 50 cm. It is cast-in-place without gravity compaction and does not produce stress release. The fine-grained material used is waste soil. The mix proportion needs to be calculated by testing the particle size of the waste soil on site and then adjusting the cement dosage.

[0022] The fluidized fiber soil layer 04 utilizes fine-grained high-density fluidized fiber soil (FHC) and fibers to form a 30cm to 50cm roadbed with an unconfined compressive strength of 1MPa to 3MPa after 28 days and a flexural and splitting strength ≥0.3MPa. The fine-grained material used is waste soil, and the mix proportion needs to be calculated by testing the particle size of the waste soil on site and then adjusting the cement dosage to obtain the mix proportion.

[0023] The fiber used in the fluid fiber soil layer 04 is straw or other waste fiber.

[0024] The fluid fiber soil layer 04 is prepared by mixing one or more of the following materials on site: excavated soil from road cut slopes, tunnel spoil, excavated soil from roadbed construction, and silt. After crushing and particle size analysis, it is mixed with cement and fiber under vacuum negative pressure and then poured on site. It is not afraid of groundwater erosion, has a certain strength, and is not easily deformed.

[0025] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: This application utilizes high-density, fluidized, solidified fiber soil subgrade and fine-grained high-density concrete pavement materials, adapting to local conditions and using engineering soil or slag as key components to construct the subgrade and pavement. Construction employs on-site casting of fine-grained high-density concrete, overcoming the problems of subgrade soil softening upon contact with water and the cumulative release of residual stress caused by pavement pre-compaction, leading to performance degradation of the road structure layer. It achieves capillary water non-softening, strong barrier properties, and strong crack resistance, eliminating key issues affecting road service life such as capillary water, reflective cracking, and rutting water pressure. The manufacturing process does not use yellow sand or crushed stone aggregates, nor does it employ heavy-load equipment for compaction, significantly reducing road construction costs and time, effectively improving road construction efficiency, and demonstrating outstanding economic benefits. It solves the technical problems of short service life, poor service performance, and high maintenance frequency in existing subgrade and pavement structures due to limitations in their own structure and materials; achieving the technical effects of long service life, good service performance, and low maintenance frequency in subgrade and pavement structures.

[0026] Example 2

[0027] Considering the significant need for fiber incorporation into materials during the construction of roadbeds and pavements in this application, and the fact that existing concrete preparation equipment often directly adds fibers to the mixing equipment and mixes them with other materials via stirring, while this approach can basically meet the requirement of incorporating fibers into other materials, it suffers from poor mixing effect, poor dispersion uniformity, and high agglomeration rate, resulting in poor finished product quality. Furthermore, agglomeration is particularly severe when longer fibers are incorporated into the concrete. To address these issues, this application provides a manufacturing device for uniformly adding various fibers to other concrete materials to prepare fiber-containing concrete with high quality and efficiency. Specifically: like Figure 2 and Figure 3 As shown, the manufacturing equipment of this application includes a mixing chamber 001, and also includes a stirring and mixing component 030, a fiber silo 100, a fiber dispersion component, an injection and blowing component, a pumping component 500, a power component, and a control unit disposed inside the mixing chamber 001.

[0028] The mixing chamber 001 is a vertically placed hollow chamber with an inlet 010 on one side and an outlet 020 at the bottom. Inside, near the bottom, there is a stirring and mixing component 030 that plays a stirring and mixing role. The mixing chamber 001 and the mixing and stirring components 030 inside it are existing technologies and will not be described in detail here.

[0029] The fiber hopper 100 is used to contain and output fibers in a timely manner. It is located at the top of the mixing hopper 001 and is connected to the injection and dispersing assembly. The fiber silo 100 includes a basic silo body, a top pressure plate 110, a bottom auger conveyor assembly 120, and a conveying pipe 130; The basic chamber is used as a container for fibers, and is filled with fibers. It has an inlet at the top and an outlet near the bottom on the side wall. The top pressure plate 110 presses on the top of the fibers in the basic chamber. The top has a vertically placed telescopic rod that is controlled to operate. The telescopic rod is directly or indirectly fixed to the basic chamber. When it extends, it applies pressure to the top pressure plate 110, causing the top pressure plate 110 to squeeze the fibers in the chamber downward. The bottom auger conveying assembly 120 is an auger structure, set at the bottom of the basic silo, arranged horizontally, connected to the discharge port, and controlled by the control unit to stably output the fiber in the fiber silo 100. The conveying pipe 130 is a flexible hose that connects the outlet to the injection and dispersing assembly, serving to convey fibers.

[0030] The fiber dispersion assembly is used to disperse fibers by blowing and pulling, and includes a first dispersion unit 200 and a second dispersion unit 300. The first dispersion unit 200 and the second dispersion unit 300 have the same structure and are symmetrically arranged, and are positioned near the top of the mixing chamber 001. like Figure 4 and Figure 5 As shown, the first dispersion unit 200 includes a carrier 210, a container block 220, and a dispersion belt assembly; The carrier 210 is a horizontal rigid support that serves to bear and support loads. The container block 220 is a vertically arranged rigid rectangular block, which is fixed to the carrier 210 by the connecting rod 211. The connecting rod 211 is a horizontal telescopic rod that is controlled to extend and retract. When it extends and retracts, it drives the container block 220 to move laterally, so that the two container blocks 220 of the first dispersion unit 200 and the second dispersion unit 300 move closer to each other or further away from each other in a timely manner. The container block 220 has a block groove 221 on its surface near another container block 220; the block groove 221 is used to provide space for the deformation of the dispersion belt assembly; the edge of the block groove 221 is more than 3 cm away from the edge of the container block 220; the entire container block 220 is a rigid box with an opening on one side. The top edge of the container block 220 near its own opening is provided with a top probing groove 222; the top probing groove 222 is a through groove, and in addition to the top opening and the bottom opening, there is also an opening on one side; when the two container blocks 220 are close together, the space enclosed by the two top probing grooves 222 is columnar. The dispersion belt assembly is generally in the shape of a roll, covering the side of the container block 220 with an opening, and includes a top roll 231, a bottom roll 232 and an elastic belt body 233. The top drum 231 and the bottom drum 232 are both horizontally placed rigid drums, which are positioned at the top and bottom of the container block 220 respectively by a rigid frame. Their axial directions are perpendicular to the length direction of the connecting rod 211. They rotate under the coordinated control of the power component and the control unit to wind up and release the elastic band 233. The elastic band 233 is a soft band made of elastic material, with a width similar to that of the container block 220. Its two ends are respectively wound and positioned on the top roll 231 and the bottom roll 232, and it is always in a taut state. The elastic band 233 has multiple rows and columns of band protrusions 234 on the surface away from the container block 220 near the center; the band protrusions 234 are rubber blocks or plastic blocks, used to disperse fibers by pulling.

[0031] Since the first dispersion unit 200 and the second dispersion unit 300 have the same structure, the structure of the second dispersion unit 300 will not be described again here; the belt protrusions 234 on the first dispersion unit 200 and the second dispersion unit 300 are arranged in an alternating manner and will not collide when they move relative to each other.

[0032] like Figures 6 to 8 As shown, the injection and blowing assembly is used to insert between the first dispersion unit 200 and the second dispersion unit 300 for feeding and blowing. The main body is a vertical rod shape, including a top telescopic body 410 and a material conveying and dispersing pipe 420. The air pump assembly 500 is a combination of an air pump, an air valve and an air delivery pipe. It is controlled by the control unit and plays the role of controlling the gas flow. The top telescopic body 410 is a vertically arranged rigid telescopic rod, with its top fixed to the inner top of the mixing chamber 001, and it extends and retracts under the coordinated control of the control unit and the power component; The material conveying pipe 420 is coaxially arranged with the top telescopic body 410 and positioned at the bottom of the top telescopic body 410; The material conveying and dispersing pipe 420 includes a base pipe 421, an inner sleeve 422, and an outer sleeve 424; The base tube 421 is a rigid round tube, and its top is fixed to the bottom of the top telescopic body 410; The inner sleeve 422 is a rigid round tube, with its top fixed to the bottom of the top telescopic body 410 and sleeved on the base tube 421. The top is closed, and the bottom is 0.2 to 3 cm higher than the bottom of the base tube 421. The distance between the inner wall and the outer wall of the base tube 421 is greater than 0.5 cm. The bottom of the inner sleeve 422 is provided with a filter screen, which serves to prevent fibers from being sucked into the gap between the base tube 421 and the inner sleeve 422. The outer sleeve 424 is a rigid round tube, with its top fixed to the bottom of the top telescopic body 410 and fitted onto the base tube 421. The top end is closed, and multiple rows of side air holes 425 are evenly distributed on its outer wall. Each side air hole 425 is a through hole for injecting gas. The bottom end of the outer sleeve 424 is 0.2 to 3 cm higher than the bottom end of the inner sleeve 422, and the distance between the inner wall and the outer wall of the inner sleeve 422 is greater than 0.5 cm. The bottom opening of the outer sleeve 424 is closed. The top end of the base pipe 421 is connected to the delivery pipe 130; the top of the space between the inner sleeve 422 and the base pipe 421 is independently connected to the air pumping assembly 500; the top of the space between the outer sleeve 424 and the inner sleeve 422 is independently connected to the air pumping assembly 500.

[0033] Preferably, the bottom of the inner sleeve 422 is provided with an annular hard block, which, together with the outer wall of the base tube 421, seals the bottom of the inner sleeve 422; the annular hard block is provided with a plurality of bottom air holes 423; and the bottom air holes 423 are provided with filter screens.

[0034] The power assembly is used to provide power for the operation of various components of the manufacturing equipment of this application, and the control unit plays the role of controlling the coordinated operation of various components of the manufacturing equipment. Both are existing technologies and will not be described in detail here.

[0035] When the manufacturing equipment used in this application is in use: Materials other than fibers enter mixing chamber 001 through inlet 010; Fiber material is fed from fiber silo 100 into mixing silo 001 via material conveying pipe 420; In the initial state, the first dispersion unit 200 and the second dispersion unit 300 are in contact with each other; at this time, the elastic band 233 is in contact with each other to form a flat elastic capsule; when fiber material needs to be added, the material conveying pipe 420 is first controlled to move down and insert into the gap between the first dispersion unit 200 and the second dispersion unit 300. Then, the fiber material is gradually and quantitatively output from the bottom of the base tube 421, and the output process gradually moves upward, so that the fiber remains in strip form between the first dispersion unit 200 and the second dispersion unit 300. While controlling the side air vent 425 to spray air outwards, it is reinserted into the gap between the first dispersion unit 200 and the second dispersion unit 300; as... Figure 9 and Figure 10 As shown, while the material conveying pipe 420 sprays air, it inflates the elastic band 233 (equivalent to inflating the bladder composed of two elastic bands 233) and at the same time disperses the fibers between the first dispersion unit 200 and the second dispersion unit 300. Then, the bottom opening of the inner sleeve 422 is controlled to draw in air, causing the elastic band 233 to reset. Blow air into the bottom opening of the inner sleeve 422 for a few seconds to blow away the adhered fibers; At this point, the material conveying pipe 420 is pulled away from between the two elastic bands 233; After this, control the two elastic bands 233 to move up and down asynchronously to separate any clumps of fibers. Insert the material conveying pipe 420 between the two elastic bands 233 again, and control the bottom opening and side air hole 425 of the inner sleeve 422 to blow air at the same time, so that the elastic band 233 expands (while expanding, the fibers adhering to the elastic band 233 will also be torn apart as the elastic band 233 expands). Then control the first dispersion unit 200 and the second dispersion unit 300 to quickly move away from each other, so that the fibers disperse and drift into the concrete material being mixed. Repeat the fiber addition process until the target amount is reached.

[0036] Preferably, to avoid the presence of the belt protrusions 234 on the elastic band 233 hindering fiber detachment and to prevent fiber residue and accumulation on the belt protrusions 234, such as Figure 11 and Figure 12 As shown, the dispersion belt assembly also includes a cover belt 235; the cover belt 235 is a soft elastic belt with the same width as the elastic belt body 233 and a thickness less than one-third of the elastic belt body 233; it covers the surface of the elastic belt body 233 where the belt body protrusions 234 are provided, overlaps with the elastic belt body 233, and is wound and positioned on the top roller 231 and the bottom roller 232 at both ends respectively and is always in a taut state; when the first dispersion unit 200 and the second dispersion unit 300 are dispersing fibers outward from each other, due to the presence of the cover belt 235, the surface of the dispersion belt assembly and the fiber base will become smooth after the first dispersion unit 200 and the second dispersion unit 300 are dispersing from each other, and fibers will not accumulate.

[0037] Preferred, such as Figure 13As shown, a material-adhesive rotating column 600 is provided directly below the first dispersion unit 200 and the second dispersion unit 300; the material-adhesive rotating column 600 is a horizontally placed cylinder that rotates continuously around its own axis under the coordinated control of the power component and the control unit; during use, at least one-third of the cylindrical surface is immersed in other concrete materials in the mixing chamber 001; during the mixing process of the concrete in the mixing chamber 001, the material-adhesive rotating column 600 will adhere to other concrete materials and the fibers that fall down during the rotation will be mixed into the other concrete materials as it rotates.

[0038] Furthermore, all telescopic poles used in this application are equipped with dustproof sleeves.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A long-life roadbed and pavement structure, characterized in that: It consists of four layers, from top to bottom: a wear layer (01), top fiber concrete layer (02), bottom fiber concrete layer (03), and fluid fiber soil layer (04), which are laid out by on-site casting; The wear layer (01) is obtained by mixing copolymer asphalt modifier with asphalt, gravel, mineral powder and fiber, and has a thickness of 3cm to 5cm; The top fiber-reinforced concrete layer (02) is made of fine-grained high-density concrete (FHC) with an unconfined compressive strength of ≥60MPa, flexural and splitting strength of ≥15MPa, elongation and shrinkage rate of ≥5% and a thickness of 25cm to 45cm. The bottom fiber concrete layer (03) is made of fine-grained high-density fiber concrete (FHC), with an unconfined compressive strength of 5 MPa to 10 MPa after 28 days, a flexural and splitting strength of ≥5.0 MPa, and a thickness of 30 cm to 50 cm. The fluidized fiber soil layer (04) uses fine-grained high-density fluidized fiber soil (FHC) and fibers to form a 30cm to 50cm roadbed with an unconfined compressive strength of 1MPa to 3MPa and a flexural and splitting strength of ≥0.3MPa after 28 days.

2. A method for manufacturing a roadbed and pavement structure, characterized in that: Used to prepare the wear layer (01) of the long-life roadbed pavement structure as described in claim 1. The steps are as follows: Step 1: Mix one or more of polyvinyl alcohol copolymer (POE), polyethylene (PE), and ethylene-vinyl acetate copolymer (EVA) with rubber granules and granulate, then dry at 50°C to prepare copolymer asphalt asphalt modifier. Step 2: The stones are screened according to their gradation; the stones are one or more of the following: basalt stones, granite stones, sandstone stones, and quartzite stones; Step 3: Heat the asphalt at 160℃ for 4 to 6 hours, add the copolymer asphalt modifier, and after melting, form copolymer-rubber modified asphalt. Continue heating at 160℃, add gravel, mineral powder, and fiber, and stir at 170℃ for 4 hours to form a wear layer.

3. A manufacturing apparatus, characterized in that: Used to prepare fiber-reinforced concrete; The manufacturing equipment includes a mixing chamber (001) and a stirring and mixing component (030) disposed inside the mixing chamber (001); it also includes a fiber silo (100), a fiber dispersion component, an injection and blowing component, and an air pumping component (500); The fiber hopper (100) is used to contain and output fibers in a timely manner. It is located on top of the mixing hopper (001) and is connected to the injection and dispersing assembly. The fiber dispersion component is used to disperse fibers by blowing and pulling. The air pump assembly (500) is a combination of an air pump, an air valve and an air delivery pipe. It is controlled by the control unit and plays the role of controlling the gas flow. The injection and blowing assembly is used to insert between the first dispersion unit (200) and the second dispersion unit (300) for feeding and blowing, and its main body is a vertical rod.

4. The manufacturing equipment as described in claim 3, characterized in that: The fiber silo (100) includes a basic silo body, a top pressure plate (110), a bottom auger conveying assembly (120), and a conveying pipe (130); The basic chamber is used as a container for fibers, and is filled with fibers. It has an inlet at the top and an outlet on the side wall near the bottom. The top pressure plate (110) presses on the top of the fibers in the basic chamber to apply pressure to the top pressure plate (110). The bottom auger conveying assembly (120) is an auger structure, set at the bottom of the basic silo, arranged horizontally, connected to the discharge port, and controlled by the control unit to stably output the fibers in the fiber silo (100); The conveying pipe (130) is a flexible hose that connects the outlet to the injection and blowing assembly, serving to convey fibers.

5. The manufacturing equipment as described in claim 4, characterized in that: The fiber dispersion assembly includes a first dispersion unit (200) and a second dispersion unit (300); The first dispersion unit (200) and the second dispersion unit (300) have the same structure and are symmetrically arranged, and are located in the mixing chamber (001) near the top; The first dispersion unit (200) includes a carrier (210), a container block (220), and a dispersion belt assembly; The carrier (210) is a horizontally placed rigid support; The container block (220) is a vertically arranged rigid rectangular block, which is fixed to the carrier (210) by a connecting rod (211); the connecting rod (211) is a horizontal telescopic rod that is controlled to extend and retract. When it extends and retracts, it drives the container block (220) to move laterally, thereby causing the two container blocks (220) of the first dispersion unit (200) and the second dispersion unit (300) to move closer to each other or further away from each other in a timely manner. The container block (220) is a rigid box with an opening on one side; The top edge of the container block (220) near its opening is provided with a top protrusion groove (222); The dispersion belt assembly is in the shape of a roll and covers the side of the container block (220) with an opening.

6. The manufacturing equipment as described in claim 5, characterized in that: The dispersion belt assembly includes a top drum (231), a bottom drum (232), and an elastic belt body (233); The top drum (231) and bottom drum (232) are both horizontally placed rigid drums, which are positioned at the top and bottom of the container block (220) respectively by a rigid frame. Their axial directions are perpendicular to the length direction of the connecting rod (211), and they rotate under the coordinated control of the power component and the control unit to wind up and release the elastic band (233). The elastic band (233) is a soft band made of elastic material, with a width similar to that of the container block (220). Its two ends are respectively wound and positioned on the top drum (231) and the bottom drum (232), and it is always in a taut state. The elastic band (233) has multiple rows and columns of band protrusions (234) on the surface away from the container block (220) near the center; the band protrusions (234) are rubber blocks or plastic blocks, used to disperse fibers by pulling.

7. The manufacturing equipment as described in claim 6, characterized in that: The belt protrusions (234) on the first dispersion unit (200) and the second dispersion unit (300) are arranged in an alternating manner, and will not collide when they move relative to each other.

8. The manufacturing equipment as described in claim 7, characterized in that: The injection and dispersion assembly includes a top telescopic body (410) and a material conveying and dispersing pipe (420); The top telescopic body (410) is vertically arranged, and its top is fixed to the inner top of the mixing chamber (001); The material conveying pipe (420) is positioned at the bottom of the top telescopic body (410); The material conveying pipe (420) includes a base pipe (421), an inner sleeve (422), and an outer sleeve (424); The top of the base pipe (421) is fixed to the bottom of the top expansion joint (410); The top of the inner sleeve (422) is fixed to the bottom of the top telescopic body (410), and is sleeved on the base pipe (421). The bottom is open and a filter screen is provided at the opening. The top of the outer sleeve (424) is fixed to the bottom of the top telescopic body (410), and is sleeved on the base pipe (421). The top is closed, and multiple rows of side air holes (425) are evenly distributed on the outer side wall. The top end of the base pipe (421) is connected to the delivery pipe (130); the space between the outer sleeve (424), the inner sleeve (422), and the base pipe (421) is independently connected to the air pump assembly.

9. The manufacturing equipment as described in any one of claims 5 to 8, characterized in that: The dispersion belt assembly also includes a cover belt (235); The covering strip (235) is a soft elastic strip with the same width as the elastic band body (233) and a thickness less than one-third of the elastic band body (233); The surface covered by the elastic band body (233) with the band body protrusion (234) overlaps with the elastic band body (233), and the two ends are respectively wound and positioned on the top roller (231) and the bottom roller (232) and are always in a taut state; when the first dispersion unit (200) and the second dispersion unit (300) are far apart from each other and output fibers outward.

10. The manufacturing equipment as described in any one of claims 5 to 8, characterized in that: A material-coating rotating column (600) is provided directly below the first dispersion unit (200) and the second dispersion unit (300); The material-coating rotating column (600) is a horizontally placed cylinder; during use, at least one-third of the cylindrical surface is immersed in other concrete materials in the mixing chamber (001); during the mixing process of the concrete in the mixing chamber (001), the material-coating rotating column (600) will adhere to other concrete materials and the fibers that fall down during the rotation will be mixed into other concrete materials as it rotates.

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