A multi-level mixed modified asphalt pavement structure

Abstract

The utility model relates to the road engineering field among civil engineering, disclose a kind of multistage mixed modified asphalt pavement structure, including bottom base course, it is characterized by: the top of bottom base course is fixedly connected with base course, the top of base course is fixedly connected with lower layer, the top of bottom base course is installed expansion mechanism, the expansion mechanism includes multiple embedded fixed reinforcement, the outer wall of multiple embedded fixed reinforcement is fixedly connected with multiple annular reinforcement, the outer wall of annular reinforcement is fixedly connected with fixed plate, the outer wall of fixed plate is fixedly connected with mounting plate, the inner wall of mounting plate is equipped with mounting groove, the inner wall of mounting plate is provided with sealing strip. In the utility model, relieve the expansion stress generated due to temperature change, load effect of pavement, multistage mixed modifier multistage compound plays synergistic effect, significantly improves high-temperature anti-rutting, low-temperature anti-cracking performance, adapts to diverse climate.

Description

Technical Field

[0001] This utility model relates to the field of road engineering in civil engineering, and in particular to a multi-stage mixed modified asphalt pavement structure. Background Technology

[0002] Modified asphalt pavement optimizes asphalt performance by adding modifiers such as rubber and resin. The aim is to address issues with traditional asphalt, such as rutting at high temperatures, cracking at low temperatures, and insufficient aging and wear resistance. This enhances the pavement's ability to withstand heavy traffic and complex climates, extends its service life, reduces economic costs and traffic disruptions caused by frequent maintenance, improves driving stability and safety, and lowers the risk of accidents caused by pavement defects. Simultaneously, it adapts to the demands of increased modern traffic loads and diverse climates, promoting the development of road engineering towards high efficiency, durability, and sustainability.

[0003] The core working principle of modified asphalt pavement is to optimize asphalt performance through the physical or chemical interaction between modifiers and base asphalt. The modifiers are uniformly dispersed in the asphalt, forming a stable network or cross-linked structure that enhances the viscoelasticity and toughness of the asphalt. At high temperatures, this structure inhibits asphalt flow and resists permanent deformation caused by vehicle loads. At low temperatures, it improves the flexibility of the asphalt and reduces cracking caused by shrinkage. At the same time, the modified asphalt has enhanced adhesion to aggregates, synergistically improving the overall fatigue resistance and aging resistance of the pavement, thus meeting the long-term service requirements under complex working conditions.

[0004] In existing technologies, some modified asphalt pavements lack targeted layered functional design, lack dedicated load-bearing layers and semi-rigid base layers to disperse stress, resulting in weak overall load-bearing capacity and stress buffering ability. The modifiers are single and not compounded, failing to synergistically improve comprehensive performance such as high-temperature rutting resistance and low-temperature crack resistance. They are also not easy to alleviate the expansion and contraction stress caused by temperature and load, and cracks are generated due to rainwater intrusion and structural deformation, leading to decreased durability and poor adaptability to diverse climates. Therefore, a multi-stage mixed modified asphalt pavement structure is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a multi-stage mixed modified asphalt pavement structure, which aims to improve the problems of reduced durability and poor adaptability to diverse climates caused by the lack of targeted layered functional design in the existing technology.

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

[0007] A multi-stage mixed modified asphalt pavement structure includes a subbase, a base course fixedly connected to the top of the subbase, a lower base course fixedly connected to the top of the base course, and an expansion mechanism installed on the top of the subbase. The expansion mechanism includes multiple pre-embedded fixed steel bars, and multiple ring steel bars are fixedly connected to the outer walls of the multiple pre-embedded fixed steel bars.

[0008] As a further description of the above technical solution:

[0009] The outer wall of the ring-shaped steel bar is fixedly connected to a fixing plate, and the outer wall of the fixing plate is fixedly connected to an mounting plate.

[0010] As a further description of the above technical solution:

[0011] The inner wall of the mounting plate has a mounting groove, and a sealing strip is provided on the inner wall of the mounting plate.

[0012] As a further description of the above technical solution:

[0013] The top of the lower layer is fixedly connected to the middle layer, and the top of the middle layer is fixedly connected to the upper layer.

[0014] As a further description of the above technical solution:

[0015] The outer wall of the pre-embedded fixing steel bar is fixedly connected to the inner wall of the base layer, and the outer wall of the sealing strip is set on the inner wall of the installation groove;

[0016] As a further description of the above technical solution:

[0017] The inner wall of the upper layer has an expansion groove, and the outer wall of the mounting plate is fixedly connected to the inner wall of the expansion groove.

[0018] This utility model has the following beneficial effects:

[0019] 1. In this utility model, the subbase 1 is provided with bearing capacity by cement-stabilized crushed stone, the base layer 2 is a semi-rigid material to disperse stress, the lower layer 3 is coarse-grained modified asphalt with anti-fatigue agent to enhance bearing capacity and durability and connect the upper and lower layers, the middle layer 4 is medium-grained modified asphalt with high viscosity agent to resist rutting, the upper layer 5 is fine-grained modified asphalt with elastic agent to improve skid resistance and noise reduction, the mounting plate 64 and sealing strip 65 ensure expansion and contraction and prevent intrusion, and alleviate the expansion and contraction stress of the road surface caused by temperature changes and load. The multi-level mixed modifiers have a synergistic effect, which significantly improves the high-temperature anti-rutting and low-temperature crack resistance performance and adapts to various climates. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of a multi-stage mixed modified asphalt pavement structure proposed in this utility model;

[0021] Figure 2 This is a schematic diagram of the mounting plate for a multi-stage mixed modified asphalt pavement structure proposed in this utility model;

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 for Figure 2 Enlarged view of point B in the middle.

[0024] Legend:

[0025] 1. Subbase; 2. Base layer; 3. Lower layer; 4. Middle layer; 5. Upper layer; 6. Expansion joint; 61. Embedded reinforcing bars; 62. Ring reinforcing bars; 63. Fixing plate; 64. Mounting plate; 65. Sealing strip; 7. Expansion groove. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Reference Figures 1 to 3 This utility model provides an embodiment of a multi-stage mixed modified asphalt pavement structure, including a subbase 1. The subbase 1 is made of cement-stabilized crushed stone, which provides overall load-bearing capacity through its own rigidity and serves as the basic load-bearing layer of the pavement structure. A base course 2 is fixedly connected to the top of the subbase 1. The base course 2 is made of semi-rigid material, which can disperse the stress generated by the upper load to the surrounding area, reduce the stress concentration of the subbase 1, and enhance the deformation resistance of the entire pavement structure. A lower layer 3 is fixedly connected to the top of the base course 2. The lower layer 3 is made of coarse-grained modified asphalt mixture and has added anti-fatigue modifier, which can improve its own load-bearing capacity and fatigue resistance. At the same time, the high-adhesion material it uses can ensure a tight connection with the base course 2 and the intermediate layer 4, avoiding interlayer separation.

[0028] The top of the lower layer 3 is fixedly connected to the middle layer 4. The middle layer 4 uses medium-grained modified asphalt mixture and adds high-viscosity modifier, which can enhance its rutting resistance and effectively cope with the permanent deformation caused by repeated vehicle rolling, maintaining the smoothness of the road surface. The top of the middle layer 4 is fixedly connected to the upper layer 5. The upper layer 5 uses fine-grained modified asphalt mixture and adds high-elasticity modifier, which can improve the anti-skid performance and noise reduction performance of the road surface. Because it is in direct contact with vehicles and the environment, it can effectively ensure driving safety and ride comfort. The top of the subbase 1 is equipped with a telescopic mechanism 6. The telescopic mechanism 6 is used to coordinate the expansion and contraction deformation of the road surface caused by temperature changes and load, and avoid road surface cracking and other damage. The inner wall of the upper layer 5 is provided with a telescopic groove 7. The telescopic groove 7 provides the necessary movement space for the road surface expansion and contraction, and avoids excessive stress during expansion and contraction.

[0029] Reference Figure 2and Figure 4 The telescopic mechanism 6 includes multiple pre-embedded fixed steel bars 61, which are embedded in the base layer 1 to provide a stable installation foundation for the telescopic mechanism 6 and ensure its firm connection with the base layer 1. Multiple ring steel bars 62 are fixedly connected to the outer walls of the multiple pre-embedded fixed steel bars 61. The ring steel bars 62 are fixedly connected to the pre-embedded fixed steel bars 61, which can enhance the integrity and stability of the steel structure and improve the support strength of the fixing plate 63. The fixing plate 63 is fixedly connected to the outer walls of the ring steel bars 62. By fixing the ring steel bars 62, the fixing plate 63 connects the various parts of the telescopic mechanism 6 into a whole, transmits the force, and ensures the stability of the structure.

[0030] An installation plate 64 is fixedly connected to the outer wall of the fixed plate 63. The installation plate 64 provides a movable carrier for the road surface expansion and contraction, coordinating the expansion and contraction movements. An installation groove is provided on the inner wall of the installation plate 64, providing an installation position for the sealing strip 65 and ensuring that the sealing strip 65 can be stably installed. The sealing strip 65 is provided on the inner wall of the installation plate 64. The sealing strip 65 is set in the installation groove, which can effectively prevent rainwater and debris from entering the expansion mechanism 6, protecting the internal structure and extending the service life. The outer wall of the pre-embedded fixed steel bar 61 is fixedly connected to the inner wall of the base layer 1. The outer wall of the sealing strip 65 is set in the inner wall of the installation groove. The outer wall of the installation plate 64 is fixedly connected to the inner wall of the expansion groove 7.

[0031] Working principle: The subbase 1 uses cement-stabilized crushed stone to provide overall load-bearing capacity as a load-bearing layer. The base course 2 uses semi-rigid materials to disperse stress and enhance the road surface's resistance to deformation. The lower layer 3 uses coarse-grained modified asphalt mixture with anti-fatigue modifiers to improve load-bearing capacity and durability. High-viscosity materials are used to ensure tight bonding with the base course 2 and intermediate layer 4. The intermediate layer 4 uses medium-grained modified asphalt mixture with high-viscosity modifiers to enhance rutting resistance and cope with permanent deformation caused by repeated rolling. The upper layer 5 uses fine-grained modified asphalt mixture with high-elasticity modifiers to improve skid resistance and noise reduction. It is in direct contact with vehicles and the environment, ensuring driving safety and comfort. The mounting plate 64 is fixed to the expansion groove 7 to provide space for road surface expansion and contraction. The sealing strip 65 prevents rainwater and debris from entering, protects the internal structure, and extends the service life of the road surface. This structure alleviates the expansion and contraction stress caused by temperature changes and loads on the road surface. The multi-stage mixed modifiers work synergistically to significantly improve high-temperature rutting resistance and low-temperature crack resistance, adapting to diverse climates.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-stage mixed modified asphalt pavement structure, comprising a subbase (1), characterized in that: The base layer (1) is fixedly connected to the top of the base layer (2), and the base layer (2) is fixedly connected to the top of the bottom layer (3). The base layer (1) is equipped with a telescopic mechanism (6), which includes multiple pre-embedded fixed steel bars (61). The outer walls of the multiple pre-embedded fixed steel bars (61) are all fixedly connected with multiple ring steel bars (62).

2. The multi-stage mixed modified asphalt pavement structure according to claim 1, characterized in that: The outer wall of the ring-shaped steel bar (62) is fixedly connected to a fixing plate (63), and the outer wall of the fixing plate (63) is fixedly connected to an mounting plate (64).

3. The multi-stage mixed modified asphalt pavement structure according to claim 2, characterized in that: The inner wall of the mounting plate (64) is provided with a mounting groove, and the inner wall of the mounting plate (64) is provided with a sealing strip (65).

4. The multi-stage mixed modified asphalt pavement structure according to claim 2, characterized in that: The top of the lower layer (3) is fixedly connected to the middle layer (4), and the top of the middle layer (4) is fixedly connected to the upper layer (5).

5. The multi-stage mixed modified asphalt pavement structure according to claim 3, characterized in that: The outer wall of the pre-embedded fixing steel bar (61) is fixedly connected to the inner wall of the base layer (1), and the outer wall of the sealing strip (65) is set on the inner wall of the mounting groove.

6. The multi-stage mixed modified asphalt pavement structure according to claim 4, characterized in that: The inner wall of the upper layer (5) is provided with a telescopic groove (7), and the outer wall of the mounting plate (64) is fixedly connected to the inner wall of the telescopic groove (7).

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