Pavement arch expansion treatment device and burying method

Abstract

The invention belongs to the field of road engineering, and relates to a road surface arch expansion treatment device and an embedding method. The road surface arch expansion treatment device comprises a telescopic layer, a filling layer, a protective layer and a fixing piece. A first gap in the cement base layer is filled with the telescopic layer, a second gap in the asphalt surface layer is filled with the filling layer, the filling layer comprises a backfilling layer and a covering layer, the first gap is covered with the protective layer, the fixing piece comprises a first fixing piece body and a second fixing piece body which are connected with each other, and the first fixing piece body and the second fixing piece body are connected with each other. The first fixing piece is located between the filling layer and the asphalt surface layer, and the second fixing piece is located between the filling layer and the cement base layer and connected to the cement base layer. According to the device, the material of the covering layer comprises polyurethane, the material of the backfilling layer comprises the modified asphalt mixture, and the double-layer design of the filling layer enables the device for treating arch expansion of the pavement to have good extension resilience performance of an asphalt material and good deformation adaptability, impact resistance, corrosion resistance and waterproof performance of a polyurethane material at the same time.

Description

Technical Field

[0001] This application relates to the field of road engineering, specifically to a pavement bulging treatment device and its installation method. Background Technology

[0002] During the maintenance of highways in the arid, saline-alkali soil areas of Inner Mongolia Autonomous Region with large temperature differences, it was found that the road surface frequently suffered from arching defects, which endangered driving safety, seriously affected the service performance and lifespan of the road surface, and restricted the local transportation and economic and social development.

[0003] Currently, for minor bulging defects, an "emergency" approach of milling the bulging area on the asphalt surface is often used. For severe bulging defects, the road surface is excavated down to the cement base layer, removing the asphalt surface layer and cement base layer material within a certain width and depth of the bulging area, and then backfilling with asphalt mixture. However, after two or three years of operational observation, it has been found that new bulging will still occur at the original bulging areas of the road surface, and this will induce large-scale cracking and breakage of the road surface, seriously restricting the road's accessibility and posing a huge threat to traffic safety.

[0004] Analysis of the causes of pavement bulging revealed that the cement base layer beneath the asphalt surface layer, under the long-term influence of temperature, moisture, and salt, suffers from insufficient cement stability, leading to volume expansion of the cement base slab. This results in lateral compressive stress exceeding limits, causing the cement base slab to bulge vertically, leading to pavement bulging and cracking. If not addressed promptly, the pavement will deteriorate further under vehicle loads, temperature variations, and moisture, eventually losing its traffic capacity. Simply milling and scraping existing bulging areas does not fundamentally eliminate the bulging. While backfilling after excavation of the asphalt surface layer and cement base layer can alleviate volume expansion to some extent, the backfill asphalt mixture has weak load-bearing capacity, easily inducing pavement subsidence. Using high-strength backfill materials can easily induce repeated bulging. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this application is to provide a road surface camber treatment device and installation method, which can provide compression deformation space when the cement base layer expands and deforms, while also being able to withstand vehicle loads, ensuring road surface traffic comfort, and solving the road surface camber problem.

[0006] On the one hand, this application provides a road surface bulging treatment device, including an expansion layer, a filling layer, a protective layer, and fasteners; The expansion layer fills the first gap in the cement base layer so that the first gap can expand and deform. The filling layer fills the second gap in the asphalt surface layer. The filling layer includes a backfill layer and a cover layer, with the cover layer located above the backfill layer. The protective layer covers the first gap, and the backfill layer is located above the cement base and the protective layer; The fasteners include a first fastener and a second fastener connected to each other. The first fastener is located between the filler layer and the asphalt surface layer, and the second fastener is located between the filler layer and the cement base layer and is connected to the cement base layer.

[0007] In an optional embodiment, the expansion layer includes a foam board that fills the first gap, and the upper surface of the foam board is flush with the upper surface of the cement base layer.

[0008] In an optional embodiment, the thickness of the backfill layer is the sum of the thicknesses of the intermediate and lower layers of the asphalt surface layer. The material of the backfill layer includes a modified asphalt mixture, which comprises graded crushed stone, modified asphalt, and coarse sand. The graded crushed stone accounts for 70-80% of the mass percentage of the modified asphalt mixture, the modified asphalt accounts for 12-18% of the mass percentage of the modified asphalt mixture, and the coarse sand accounts for 8-12% of the mass percentage of the modified asphalt mixture.

[0009] In an optional embodiment, the graded crushed stone accounts for 75% by mass of the modified asphalt mixture, the modified asphalt accounts for 15% by mass of the modified asphalt mixture, and the coarse sand accounts for 10% by mass of the modified asphalt mixture.

[0010] In an optional embodiment, the modified asphalt comprises the following raw materials in parts by weight: 80-120 parts of base asphalt, 2-10 parts of SBS modifier, 15-25 parts of rubber powder, 2-8 parts of anti-rutting agent, and 10-20 parts of light oil.

[0011] In an optional embodiment, the modified asphalt comprises the following raw materials in parts by weight: 100 parts base asphalt, 7 parts SBS modifier, 20 parts rubber powder, 5 parts anti-rutting agent, and 15 parts light oil.

[0012] In an optional embodiment, the material of the overlay includes polyurethane, the thickness of the overlay is the same as the thickness of the top layer of the asphalt surface layer, and the upper surface of the overlay is flush with the upper surface of the asphalt surface layer.

[0013] In an optional embodiment, the width of the protective layer is greater than the width of the first gap, so that the protective layer covers the first gap, and the protective layer is fixedly connected to the expansion layer by bolts.

[0014] In an optional embodiment, the fasteners are symmetrically distributed on both sides of the backfill layer and are fixedly connected to the cement base layer by bolts.

[0015] On the other hand, this application provides a method for installing a road surface bulging treatment device, used for installing the road surface bulging treatment device described in any of the foregoing embodiments, comprising the following steps: S1. Remove the asphalt surface layer and cement base layer in the arched area of ​​the road surface, so that the width of the second gap in the asphalt surface layer is greater than the width of the first gap in the cement base layer. S2. Fill the first gap with the expansion layer, so that the thickness of the expansion layer is less than the height of the first gap, and the upper surface of the expansion layer is flush with the upper surface of the cement base. S3. Cover the first gap with the protective layer and fix the protective layer to the expansion layer with screws; S4. Place the first fastener tightly against the side wall of the second gap above the cement base, and fix the second fastener and the cement base. S5. Fill the second gap with backfill layer and cover layer in sequence to complete the installation of the road bulging treatment device.

[0016] As described above, compared with the prior art, the road surface bulging treatment device and installation method provided in this application have at least the following beneficial effects: The pavement camber treatment device of this application comprises a backfill layer and a cover layer. This dual-layer design effectively overcomes post-construction pavement settlement problems induced by a single material. The cover layer material includes polyurethane, which effectively bonds tightly to the upper layer of the asphalt surface layer and possesses good ductility, deformation coordination characteristics, impact resistance, corrosion resistance, and waterproofing properties. The backfill layer material includes modified asphalt mixture, which serves both deformation and load-bearing functions. The design and selection of the modified asphalt mixture and polyurethane materials enable the pavement camber treatment device to simultaneously possess the excellent ductility and resilience of asphalt materials and the excellent deformation adaptability, impact resistance, corrosion resistance, and waterproofing properties of polyurethane materials.

[0017] The method for burying the road surface bulging treatment device provided in this application is used to bury the aforementioned road surface bulging treatment device, and therefore also has the aforementioned beneficial effects. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a road surface bulging treatment device provided in Embodiment 1 of this application.

[0020] Figure 2 This is a schematic flowchart illustrating a method for burying a road surface bulging treatment device according to Embodiment 2 of this application.

[0021] In the diagram: 1. Expansion layer; 2. Filling layer; 21. Backfill layer; 22. Covering layer; 3. Protective layer; 4. Fastener; 41. First fastener; 42. Second fastener; 5. Cement base layer; 6. Asphalt surface layer. Detailed Implementation

[0022] To make the technical objectives, technical solutions, and technical effects of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, for example, referring to both fixed connections and detachable connections. Furthermore, the descriptions using terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with an implementation or example is included in at least one implementation or example of this application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same implementation or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more implementations or examples.

[0026] Example 1 To address the problems of road subsidence and repeated arching in the existing technology described above, this embodiment provides a road arching treatment device. (Refer to...) Figure 1 The road surface camber treatment device of this embodiment includes an expansion layer 1, a filling layer 2, a protective layer 3, and a fastener 4. The expansion layer 1 fills the first gap in the cement base layer 5 to allow the first gap to expand and contract; the filling layer 2 fills the second gap in the asphalt surface layer 6, and the filling layer 2 includes a backfill layer 21 and a covering layer 22, with the covering layer 22 located above the backfill layer 21; the protective layer 3 covers the first gap, and the backfill layer 21 is located above the cement base layer 5 and the protective layer 3; the fastener 4 includes a first fastener 41 and a second fastener 42 connected to each other, the first fastener 41 being located between the filling layer 2 and the asphalt surface layer 6, and the second fastener 42 being located between the filling layer 2 and the cement base layer 5 and connected to the cement base layer 5.

[0027] In practical applications, by designing the filling layer 2 as a double-layer structure including the backfill layer 21 and the cover layer 22, the problem of post-construction road settlement induced by the filling layer 2 being filled with a single material can be effectively overcome.

[0028] In this embodiment, the expansion layer 1 fills the first gap in the cement base layer 5, and the upper surface of the expansion layer 1 is flush with the upper surface of the cement base layer 5, so as to allow the first gap to expand and contract smoothly under the influence of temperature or load. Further, the filling material used for the expansion layer 1 includes foam board, which can be one or more combinations of polystyrene foam board, polyurethane foam board, or other suitable foam boards. As a lightweight compressible material, the foam board can compress or recover when the cement base layer 5 expands and contracts due to temperature changes or load, thus buffering and reducing stress concentration. Furthermore, the foam board can prevent debris, modified asphalt mixture, etc., from falling into the first gap during construction or use, thereby ensuring that the first gap can expand and contract smoothly.

[0029] In this embodiment, the filling layer 2 fills the second gap in the asphalt surface layer 6 and is located above the cement base layer 5 and the protective layer 3. The asphalt surface layer 6 can be divided into three layers: a top layer, a middle layer, and a bottom layer. The filling layer 2 includes a backfill layer 21 and a cover layer 22, and the cover layer 22 is located above the backfill layer 21.

[0030] Backfill layer 21 fills the second gap and is located above the cement base layer 5 and the protective layer 3. The thickness of backfill layer 21 is the sum of the thicknesses of the middle and lower layers of the asphalt surface layer 6, which can improve construction efficiency. Specifically, the thickness of backfill layer 21 can be determined according to the specific conditions of the construction site. Further, the filling material of backfill layer 21 includes modified asphalt mixture, which comprises graded crushed stone, modified asphalt, and coarse sand. The mass percentage of graded crushed stone in the modified asphalt mixture is 70-80%, the mass percentage of modified asphalt is 12-18%, and the mass percentage of coarse sand is 8-12%. Graded crushed stone is a mixture composed of aggregates of various sizes, which can improve the load-bearing capacity and impact resistance of the modified asphalt mixture and extend the service life of the road. According to the fineness modulus, coarse sand is usually defined as sand with a particle size between 0.5mm and 2.0mm, which can give the modified asphalt mixture good stability and load-bearing capacity.

[0031] In one optional embodiment, the graded crushed stone accounts for 70% by mass of the modified asphalt mixture, the modified asphalt accounts for 12% by mass of the modified asphalt mixture, and the coarse sand accounts for 8% by mass of the modified asphalt mixture.

[0032] In one optional embodiment, the graded crushed stone accounts for 77% by mass of the modified asphalt mixture, the modified asphalt accounts for 14% by mass of the modified asphalt mixture, and the coarse sand accounts for 9% by mass of the modified asphalt mixture.

[0033] In one optional embodiment, the graded crushed stone accounts for 80% by mass of the modified asphalt mixture, the modified asphalt accounts for 18% by mass of the modified asphalt mixture, and the coarse sand accounts for 12% by mass of the modified asphalt mixture.

[0034] In a preferred embodiment, the graded crushed stone accounts for 75% by mass in the modified asphalt mixture, the modified asphalt accounts for 15% by mass in the modified asphalt mixture, and the coarse sand accounts for 10% by mass in the modified asphalt mixture.

[0035] Modified asphalt includes base asphalt, SBS modifier, rubber powder, anti-rutting agent, and light oil fraction. Base asphalt is the basic material for preparing various modified asphalts by incorporating additives. Its main components include petroleum processing products such as vacuum residue and propane-de-oiled asphalt, and it is commonly used in highways, airport runways, and similar applications. Further, the base asphalt can be one or more combinations of natural asphalt, petroleum asphalt, tar asphalt, or other suitable base asphalts. Preferably, the base asphalt is AH70 base asphalt. Further, by weight, the base asphalt content in the modified asphalt can be 80-120 parts, specifically 80, 90, 105, 120, or other suitable values. Preferably, the base asphalt content in the modified asphalt is 100 parts. For modified asphalt mixtures, the binding effect of the base asphalt compacts the particles and prevents deformation-induced cracking and damage under external forces.

[0036] SBS modifier is a thermoplastic elastomer with a two-phase structure. The styrene blocks impart strength to the base asphalt, while the butadiene blocks in the middle enhance its flexibility. Furthermore, the SBS modifier can be a linear structure, a star structure, or a combination of one or more other suitable SBS modifiers. More specifically, the mass fraction of the SBS modifier in the asphalt mixture is 2 to 10 parts; more specifically, the mass fraction of the SBS modifier in the asphalt mixture can be 2, 3, 6, 10 parts, or other suitable values. Preferably, the mass fraction of the SBS modifier in the asphalt mixture is 7 parts.

[0037] The rubber powder can be one or more of ultrafine rubber powder, general rubber powder, or other suitable rubber powders. Preferably, the rubber powder is ultrafine rubber powder, obtained from crushed waste tires, and its main components are natural rubber powder and styrene-butadiene rubber powder. Compared with general rubber powder, ultrafine rubber powder has smaller particles and a larger specific surface area, which is conducive to absorbing the lightweight components of the base asphalt and reacting with it, making it suitable for high-level modification of base asphalt. In addition, this rubber powder also contains components such as carbon black, which can effectively improve the anti-aging ability of asphalt. Further, the mass part of rubber powder in the asphalt mixture is 15 to 25 parts. Specifically, the mass part of SBS modifier in the asphalt mixture can be 15 parts, 18 parts, 21 parts, 25 parts, or other suitable values. Preferably, the mass part of rubber powder in the asphalt mixture is 20 parts.

[0038] The anti-rutting agent can be one or more of organic, inorganic, or other suitable anti-rutting agents, preferably organic, which can effectively improve the high-temperature stability of asphalt. Further, the mass fraction of the anti-rutting agent in the asphalt mixture is 2 to 8 parts, specifically, it can be 2, 3, 5, 8, or other suitable values, preferably 5 parts by mass.

[0039] The light oil component can be one or more of aromatic oils or other suitable light oils, preferably aromatic oils. The light oil component can have a blending effect in the asphalt mixture, increasing the compatibility between the additives and the base asphalt, and improving the low-temperature flexibility of the asphalt mixture. Further, the mass fraction of the light oil component in the asphalt mixture is 10-20 parts, specifically 10, 13, 16, 20 parts, or other suitable values. Preferably, the mass fraction of the light oil component in the asphalt mixture is 15 parts.

[0040] In an optional embodiment, the test data for penetration, softening point, ductility, storage stability (softening point difference), and elastic recovery of SBS-modified asphalt alone are 5.7 mm, 68.9 °C, 435 mm, 1.9 °C, and 94.5%, respectively; the test data for penetration, softening point, ductility, storage stability (softening point difference), and elastic recovery of rubber powder-modified asphalt alone are 6.3 mm, 56 °C, 218 mm, 2 °C, and 91.5%, respectively; and the test data for penetration, softening point, ductility, storage stability (softening point difference), and elastic recovery of the modified asphalt of this application are 4 mm, 78 °C, 610 mm, 0.5 °C, and 96.2%, respectively.

[0041] Compared with the single modified asphalt in the prior art, this application modifies the base asphalt by adding multiple modifying components such as SBS modifier, rubber powder, anti-rutting agent and light oil to the base asphalt. The modified asphalt prepared has significant improvements in properties such as penetration, softening point, ductility, storage stability (softening point difference) and elastic recovery.

[0042] The cover layer 22 is located above the backfill layer 21. The thickness of the cover layer 22 is the same as the thickness of the top layer of the asphalt surface layer 6, and the upper surface of the cover layer 22 is flush with the upper surface of the asphalt surface layer 6 to improve construction efficiency and ensure the smoothness of the road surface after construction. Specifically, the thickness of the cover layer 22 can be determined according to the specific conditions of the construction site. Furthermore, the material of the cover layer 22 can be one or more of suitable materials such as polyurethane and rubber. Preferably, the material of the cover layer 22 is polyurethane. Polyurethane has good elasticity and durability, and can form a continuous sealing layer in the second gap in the asphalt surface layer 6, effectively preventing rainwater and snowmelt from seeping in and preventing frost heave damage to the cement base layer 5. In addition, polyurethane has high elasticity and flexibility, and can deform with structural expansion and contraction without cracking or peeling, thus playing a role in buffering and stress release.

[0043] In this embodiment, the protective layer 3 covers the first gap, that is, it is located above the expansion layer 1 and the cement base layer 5, and the width of the protective layer 3 is greater than the width of the first gap, so that the protective layer 3 completely covers the first gap. Furthermore, the protective layer 3 can be aluminum alloy, stainless steel or other suitable materials, to prevent modified asphalt mixture in the backfill layer 21 from falling into the first gap and damaging the expansion layer 1.

[0044] The fastener 4 includes a first fastener 41 and a second fastener 42 connected to each other. The first fastener 41 is located between the fill layer 2 and the asphalt surface layer 6, and the second fastener 42 is located between the fill layer 2 and the cement base layer 5, and is fixedly connected to the cement base layer 5 by bolts. Optionally, the fastener 4 can be made of carbon structural steel or one or more other suitable materials. Furthermore, the fasteners 4 are symmetrically distributed on both sides of the backfill layer 21. While transmitting vertical loads, the fasteners 4 are fixed together with the cement base layer 5, which can limit the pressure on the asphalt surface layers 6 on both sides, thereby preventing cracks in the fill layer 2 and improving the service life of the entire pavement arching treatment device.

[0045] Example 2 This embodiment provides a method for installing a road surface camber treatment device, used for installing any of the road surface camber treatment devices in Embodiment 1, with reference to... Figure 2 The method for installing the road surface bulging treatment device provided in this embodiment includes the following steps: S1. Remove the asphalt surface layer and cement base layer in the arched area of ​​the road surface, so that the width of the second gap in the asphalt surface layer is greater than the width of the first gap in the cement base layer. S2. Fill the first gap with the expansion layer, so that the thickness of the expansion layer is less than the height of the first gap, and the upper surface of the expansion layer is flush with the upper surface of the cement base. S3. Cover the first gap with the protective layer and fix the protective layer to the expansion layer with screws; S4. Place the first fastener tightly against the side wall of the second gap above the cement base, and fix the second fastener and the cement base. S5. Fill the second gap with backfill layer and cover layer in sequence to complete the installation of the road bulging treatment device.

[0046] First, step S1 is performed, removing the asphalt surface layer 6 and cement base layer 5 in the bulging area of ​​the road surface, so that the width of the second gap in the asphalt surface layer 6 is greater than the width of the first gap in the cement base layer 5. The specific widths of the second gap in the asphalt surface layer 6 and the first gap in the cement base layer 5 can be determined comprehensively based on factors such as the size of the bulging area and the distance between adjacent bulging treatment devices. After the bulging area is removed, a second gap is formed in the asphalt surface layer 6, providing filling space for the filling layer 2. Optionally, the width of the second gap in the asphalt surface layer 6 can be 1~3m, specifically, it can be 1m, 1.5m, 2.6m, 3m, or other suitable values. After the area of ​​pavement bulge is excavated, a first gap is formed in the cement base layer 5. The first gap provides a filling space for the expansion layer 1. Optionally, the width of the first gap in the cement base layer 5 can be 0.5~1m. Specifically, the width of the first gap in the cement base layer 5 can be 0.5m, 0.7m, 0.8m, 1m or other suitable values.

[0047] Next, step S2 is performed, where the expansion layer 1 is filled into the first gap in the cement base layer 5. The upper surface of the expansion layer 1 is flush with the upper surface of the cement base layer 5. At the same time, it should be noted that the thickness of the expansion layer 1 is less than the height of the first gap in the cement base layer 5. That is, a certain gap space is left below the expansion layer 1 in the first gap without filling. When the cement base layer 5 expands and deforms, the gap space below the expansion layer 1 is designed to provide sufficient space for the expansion and deformation of the cement base layer 5, which can improve the stability and durability of the asphalt surface layer 6 and the road camber treatment device.

[0048] Next, step S3 is performed, where the protective layer 3 is placed over the first gap and the protective layer is fixed to the expansion layer with screws. The protective layer 3 is located above the expansion layer 1 and the cement base layer 5, and the width of the protective layer 3 is greater than the width of the first gap, so that the protective layer 3 completely covers the first gap. Furthermore, the protective layer 3 can be made of aluminum alloy, stainless steel or other suitable materials to prevent modified asphalt mixture in the backfill layer 21 from falling into the first gap and damaging the expansion layer 1.

[0049] Next, step S4 is performed, placing the first fixing member 41 tightly against the sidewall of the second gap above the cement base layer 5, and fixing the second fixing member 42 and the cement base layer 5 with screws. The fixing member 4 includes a first fixing member 41 and a second fixing member 42 connected to each other. The first fixing member 41 is located between the filling layer 2 and the asphalt surface layer 6, and the second fixing member 42 is located between the filling layer 2 and the cement base layer 5, and is fixedly connected to the cement base layer 5 with bolts. Optionally, the material of the fixing member 4 can be carbon structural steel or one or more combinations of other suitable materials. Furthermore, the fixing members 4 are symmetrically distributed on both sides of the backfill layer 21. While transmitting vertical loads, the fixing members 4 are fixed together with the cement base layer 5, which can limit the pressure on the asphalt surface layers 6 on both sides, thereby preventing cracks in the filling layer 2 and improving the service life of the entire pavement arching treatment device.

[0050] Next, step S5 is executed, in which a backfill layer and a cover layer are sequentially filled into the second gap. The backfill layer 21 fills the second gap and is located above the cement base layer 5 and the protective layer 3. The thickness of the backfill layer 21 is the sum of the thicknesses of the middle and lower layers of the asphalt surface layer 6, which can improve construction efficiency. Specifically, the thickness of the backfill layer 21 can be determined according to the specific conditions of the construction site. Further, the filling material of the backfill layer 21 includes modified asphalt mixture, which includes graded crushed stone, modified asphalt, and coarse sand. In a preferred embodiment, the mass percentage of graded crushed stone in the modified asphalt mixture is 75%, the mass percentage of modified asphalt in the modified asphalt mixture is 15%, and the mass percentage of coarse sand in the modified asphalt mixture is 10%.

[0051] Modified asphalt comprises base asphalt, SBS modifier, rubber powder, anti-rutting agent, and light oil. Compared with single-modified asphalt in the prior art, this application uses multiple modifying components such as SBS modifier, rubber powder, anti-rutting agent, and light oil to perform composite modification on the base asphalt. The resulting modified asphalt exhibits significant improvements in properties such as penetration, softening point, ductility, storage stability (softening point difference), and elastic recovery.

[0052] The cover layer 22 is located above the backfill layer 21. The thickness of the cover layer 22 is the same as the thickness of the top layer of the asphalt surface layer 6, and the upper surface of the cover layer 22 is flush with the upper surface of the asphalt surface layer 6 to improve construction efficiency and ensure the smoothness of the road surface after construction. Specifically, the thickness of the cover layer 22 can be determined according to the specific conditions of the construction site. Furthermore, the material of the cover layer 22 can be one or more of suitable materials such as polyurethane and rubber. Preferably, the material of the cover layer 22 is polyurethane. Polyurethane has good elasticity and durability, and can form a continuous sealing layer in the second gap in the asphalt surface layer 6, effectively preventing rainwater and snowmelt from seeping in and preventing frost heave damage to the cement base layer 5. In addition, polyurethane has high elasticity and flexibility, and can deform with structural expansion and contraction without cracking or peeling, thus playing a role in buffering and stress release.

[0053] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify, alter, or combine the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A road surface bulging treatment device, characterized in that, Includes expansion layer, filling layer, protective layer and fasteners; The expansion layer fills the first gap in the cement base layer so that the first gap can expand and deform. The filling layer fills the second gap in the asphalt surface layer. The filling layer includes a backfill layer and a cover layer, with the cover layer located above the backfill layer. The protective layer covers the first gap, and the backfill layer is located above the cement base and the protective layer; The fasteners include a first fastener and a second fastener connected to each other. The first fastener is located between the filler layer and the asphalt surface layer, and the second fastener is located between the filler layer and the cement base layer and is connected to the cement base layer.

2. The road surface bulging treatment device according to claim 1, characterized in that, The expansion layer includes a foam board that fills the first gap, and the upper surface of the foam board is flush with the upper surface of the cement base layer.

3. The road surface bulging treatment device according to claim 1, characterized in that, The thickness of the backfill layer is the sum of the thicknesses of the middle and lower layers of the asphalt surface layer. The material of the backfill layer includes modified asphalt mixture, which includes graded crushed stone, modified asphalt, and coarse sand. The graded crushed stone accounts for 70-80% of the mass percentage of the modified asphalt mixture, the modified asphalt accounts for 12-18% of the mass percentage of the modified asphalt mixture, and the coarse sand accounts for 8-12% of the mass percentage of the modified asphalt mixture.

4. The road surface bulging treatment device according to claim 3, characterized in that, The graded crushed stone accounts for 75% of the mass percentage of the modified asphalt mixture, the modified asphalt accounts for 15% of the mass percentage of the modified asphalt mixture, and the coarse sand accounts for 10% of the mass percentage of the modified asphalt mixture.

5. The road surface bulging treatment device according to claim 3, characterized in that, The modified asphalt comprises the following raw materials in parts by weight: 80-120 parts of base asphalt, 2-10 parts of SBS modifier, 15-25 parts of rubber powder, 2-8 parts of anti-rutting agent, and 10-20 parts of light oil.

6. The road surface bulging treatment device according to claim 3, characterized in that, The modified asphalt comprises the following raw materials in parts by weight: 100 parts base asphalt, 7 parts SBS modifier, 20 parts rubber powder, 5 parts anti-rutting agent, and 15 parts light oil.

7. The road surface bulging treatment device according to claim 1, characterized in that, The material of the overlay includes polyurethane, the thickness of the overlay is the same as the thickness of the top layer of the asphalt surface layer, and the upper surface of the overlay is flush with the upper surface of the asphalt surface layer.

8. The road surface bulging treatment device according to claim 1, characterized in that, The protective layer is wider than the first gap so that it covers the first gap, and the protective layer is fixedly connected to the expansion layer by bolts.

9. The road surface bulging treatment device according to claim 1, characterized in that, The fasteners are symmetrically distributed on both sides of the backfill layer and are fixedly connected to the cement base layer by bolts.

10. A method for installing a road surface camber treatment device, used for installing the road surface camber treatment device according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Remove the asphalt surface layer and cement base layer in the arched area of ​​the road surface, so that the width of the second gap in the asphalt surface layer is greater than the width of the first gap in the cement base layer. S2. Fill the first gap with the expansion layer, so that the thickness of the expansion layer is less than the height of the first gap, and the upper surface of the expansion layer is flush with the upper surface of the cement base. S3. Cover the first gap with the protective layer and fix the protective layer to the expansion layer with screws; S4. Place the first fastener tightly against the side wall of the second gap above the cement base, and fix the second fastener and the cement base. S5. Fill the second gap with backfill layer and cover layer in sequence to complete the installation of the road bulging treatment device.

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