Rigid-flexible composite anti-cracking pavement structure

Abstract

The utility model discloses a rigid and flexible composite anti -crack paving pavement structure relates to the pavement paving structure technical field in road engineering, including rigid base layer, the rigid base layer top from bottom to top has in turn laid and pours into formula composite layer and high elastic modified asphalt wearing layer, the interlayer combination layer who is used for adhesion is arranged between the opposite surface of pouring formula composite layer and high elastic modified asphalt wearing layer, the utility model has the flexibility of asphalt and the rigidity of cement through pouring formula composite layer, and high dynamic stability can effectively resist high temperature rut, simultaneously, through the grooving treatment to rigid base layer surface, can improve the combination strength of pouring formula composite layer and rigid base layer, is favorable to the lateral anti -pulling strength of cooperation with the anchor bush and anchor rod reinforcement, and the interlayer combination layer has guaranteed rigid and flexible material interface firm adhesion, effectively prevents moisture invasion and interlayer peeling, guarantees the integrity and long -term service performance of pavement structure.

Description

Technical Field

[0001] This utility model relates to the field of pavement structure technology in road engineering, and in particular to a rigid-flexible composite crack-resistant pavement structure. Background Technology

[0002] Traditional composite pavements (such as asphalt overlay on cement concrete slabs) can combine the advantages of rigid and flexible materials, but in long-term use, the joints between layers are prone to becoming weak points.

[0003] Under repeated traffic loads and temperature stress, pavement is prone to defects such as reflective cracks, interlayer delamination, and rutting, which seriously affect the service life of the pavement and driving safety.

[0004] While existing technologies offer improvements for interlayer bonding, such as roughening the rigid base surface and laying waterproof adhesive materials, these methods may damage the base structure, and the roughening dimensions are difficult to control, resulting in unstable bonding effects. Furthermore, although some grouting pavement technologies can provide high rutting resistance, their low-temperature crack resistance and interlayer synergistic deformation capabilities still have room for improvement.

[0005] In view of this, this application proposes a rigid-flexible composite crack-resistant pavement structure. Utility Model Content

[0006] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a rigid-flexible composite crack-resistant pavement structure.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A rigid-flexible composite crack-resistant pavement structure includes a rigid base course. From bottom to top, an infill composite layer and a high-elasticity modified asphalt wearing course are laid on the top of the rigid base course. An interlayer bonding layer for adhesion is provided between the opposite surfaces of the infill composite layer and the high-elasticity modified asphalt wearing course, forming an integrated pavement structure with layered stacking. Expansion joints are provided between the splicing joints of the integrated pavement structure. Drainage strips are provided inside the expansion joints. A bending plate is provided on the top of the drainage strip. Multiple filter holes are arrayed on the top of the bending plate. The bottom side of the drainage strip forms an active drainage channel with the drainage pipe buried in the rigid base. The rigid base layer end face is provided with several anchor sleeves in an array along the length direction, and anchor rods for fixing are inserted inside the anchor sleeves, with the other end of the anchor rods anchored to one side of the shoulder block.

[0008] As a further preferred embodiment of this technical solution, the drainage strip has a trapezoidal cross-sectional shape, and the inner cavity of the drainage strip is provided with a slidable support strip, which supports the top opening of the inner cavity of the drainage strip.

[0009] As a further preferred embodiment of this technical solution, the infused composite layer includes: A large-pore asphalt composite frame is laid on top of the rigid base layer. The large-pore asphalt composite frame has structural pores to increase the filling strength. The grouting reinforcement structure is injected and molded into the structural pores of the large-pore asphalt mixture framework.

[0010] As a further preferred embodiment of this technical solution, the thickness of the macroporous asphalt mixing framework... h Satisfy: 4cm≤ h The porosity of the macroporous asphalt composite framework is 25%~30%, with a diameter of ≤6cm.

[0011] As a further preferred embodiment of this technical solution, the top array of the rigid base layer has several grooves with a rectangular cross-sectional shape, and the infused composite layer flows into the grooves for wedging before molding.

[0012] As a further preferred embodiment of this technical solution, the interlayer bonding layer includes a roughened structural layer, which is a rigid base layer covered with 50% to 70% modified rubber particles. A modified emulsified asphalt adhesive layer is connected to the top of the roughened structural layer, and the modified emulsified asphalt adhesive layer is located on the bottom side of the high-elasticity modified asphalt wear layer.

[0013] As a further preferred embodiment of this technical solution, the thickness of the high-elasticity modified asphalt wear layer... h Satisfy: 6cm≤ h The high-elasticity modified asphalt wear layer, with a thickness of ≤12cm, comprises an upper layer and a lower layer, wherein the thickness ratio of the lower layer to the upper layer is 1.4~1.8:1.

[0014] As a further preferred embodiment of this technical solution, the upper layer adopts a granular SBS modified asphalt concrete paving structure.

[0015] As a further preferred embodiment of this technical solution, the lower layer adopts a medium-grained asphalt concrete paving structure.

[0016] As a further preferred embodiment of this technical solution, the anchoring sleeve is embedded in the top groove of the rigid base layer so as to stabilize the cross-linking strength of the injected composite layer in the rigid base layer through the anchoring sleeve and the anchor rod.

[0017] This utility model has the following beneficial effects: This invention utilizes an infiltrated composite layer as a stress-absorbing layer, effectively suppressing the upward reflection of shrinkage cracks from the rigid base layer. It is firmly bonded to the upper and lower layers via an interlayer bonding layer, working together to significantly improve the fatigue and crack resistance of the pavement structure. Furthermore, the infiltrated composite layer combines the flexibility of asphalt with the rigidity of cement, exhibiting high dynamic stability and effectively resisting high-temperature rutting, making it particularly suitable for heavy-load road sections such as intersections and bus stops. Simultaneously, the grooving treatment of the rigid base layer surface enhances the bonding strength between the infiltrated composite layer and the rigid base layer, facilitating the integration of anchor sleeves and anchor bolts to strengthen lateral pull-out strength. The interlayer bonding layer ensures a strong bond between the rigid and flexible materials, effectively preventing moisture intrusion and interlayer delamination, thus guaranteeing the integrity and long-term service performance of the pavement structure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a rigid-flexible composite crack-resistant pavement structure proposed in this utility model. Figure 2 This is a side cross-sectional view of a rigid-flexible composite crack-resistant pavement structure proposed in this utility model. Figure 3 This is a schematic diagram of an expansion joint in a rigid-flexible composite crack-resistant pavement structure proposed in this utility model. Figure 4 This is a partially enlarged schematic diagram of the grouting composite layer of a rigid-flexible composite crack-resistant pavement structure proposed in this utility model.

[0019] In the diagram: 1. Rigid base layer; 2. Anchor bolt; 3. Injection-type composite layer; 301. Large-pore asphalt mixed frame; 302. Grouting reinforcement structure; 4. Interlayer bonding layer; 5. High-elasticity modified asphalt wearing course; 6. Expansion joint; 7. Drainage pipe; 8. Drainage strip; 9. Bending plate; 10. Anchor sleeve. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] This utility model provides the following technical solution: like Figures 1 to 4 As shown, a rigid-flexible composite crack-resistant pavement structure includes a rigid base layer 1. The top of the rigid base layer 1 is laid with an infilled composite layer 3 and a high-elasticity modified asphalt wear layer 5 from bottom to top. An interlayer bonding layer 4 for adhesion is provided between the opposite surfaces of the infilled composite layer 3 and the high-elasticity modified asphalt wear layer 5, forming an integrated pavement structure with layered stacking. Expansion joints 6 are provided between the splicing joints of the integrated road structure. Drainage strips 8 are provided inside the expansion joints 6. Bending plates 9 are provided on the top of the drainage strips 8. Multiple water filter holes are arranged in an array on the top of the bending plates 9. The bottom side of the drainage strips 8 and the drainage pipes 7 buried in the rigid base layer 1 form an active drainage channel. The rigid base layer 1 has several anchor sleeves 10 embedded in an array along its length. An anchor rod 2 for fixing is inserted inside the anchor sleeve 10, and the other end of the anchor rod 2 is anchored to one side of the shoulder block.

[0022] In the specific embodiments provided in this application, the cross-sectional shape of the drainage strip 8 is trapezoidal, and the inner cavity of the drainage strip 8 is provided with a sliding support strip, which supports the top opening of the inner cavity of the drainage strip 8.

[0023] In the specific embodiments provided in this application, the infused composite layer 3 includes: A large-pore asphalt mixture frame 301 is laid on top of the rigid base layer 1. The large-pore asphalt mixture frame 301 has structural pores to increase the filling strength through the structural pores. The grouting reinforcement structure 302 is injected and molded into the structural pores of the large-pore asphalt mixture frame 301.

[0024] In the specific embodiments provided in this application, the thickness of the macroporous asphalt mixing frame 301 is... h Satisfy: 4cm≤ h The porosity of the macroporous asphalt composite frame 301 is 25%~30%, with a diameter of ≤6cm.

[0025] In the specific embodiments provided in this application, the top of the rigid base layer 1 is arrayed with several grooves, the cross-sectional shape of which is rectangular. The infused composite layer 3 flows into the grooves for wedging before molding.

[0026] In the specific embodiments provided in this application, the interlayer bonding layer 4 includes a roughened structure layer, which is a rigid base layer 1 covered with 50% to 70% modified rubber particles. A modified emulsified asphalt adhesive layer is connected to the top of the roughened structure layer, and the modified emulsified asphalt adhesive layer is located on the bottom side of the high-elasticity modified asphalt wear layer 5.

[0027] This application provides a basic embodiment of an integrated pavement structure, wherein the thickness of the high-elasticity modified asphalt wearing course 5 is... h Satisfy: 6cm≤ hThe high-elasticity modified asphalt wear layer 5, with a thickness of ≤12cm, includes an upper layer and a lower layer. The thickness ratio of the lower layer to the upper layer is 1.4~1.8:1. The upper layer adopts a granular SBS modified asphalt concrete paving structure, and the lower layer adopts a medium-grained asphalt concrete paving structure. The anchor sleeve 10 is embedded in the top groove of the rigid base layer 1 so as to stabilize the cross-linking strength of the injected composite layer 3 in the rigid base layer 1 through the anchor sleeve 10 and the anchor rod 2. By setting up a semi-flexible composite layer supported by a rigid base layer 1 and internally grouted as the main body, and working in conjunction with the upper and lower functional layers, the effective diffusion of loads and the active dissipation of stress are achieved.

[0028] To further improve the performance of asphalt pavement structures, this application can also optimize the material selection of each structural layer that makes up the integrated pavement structure. The following is an advanced embodiment of the integrated pavement structure in this application. Example

[0029] The infused composite layer 3 is the key to achieving rigid-flexible composite and crack resistance.

[0030] Large-pore asphalt mixture matrix: An open-graded or discontinuous-graded design is adopted, using hard, wear-resistant basalt or diabase as aggregate and high-viscosity modified asphalt as binder. The target porosity is controlled at 25%~30% to form a connected pore network, providing space for subsequent grouting. As the core of the rigid-flexible composite, its thickness is recommended to be 4~6 cm. This layer first lays the large-pore asphalt mixture matrix (porosity 25%~30%), which can use OGFC-10 or OGFC-13 gradation, and then injects a special cement-based grout. The nominal maximum particle size of the matrix asphalt mixture should match the design thickness; for example, a 4 cm thick layer uses GA10 or OGFC-10, and a 6 cm thick layer can use OGFC-13.

[0031] Cement-based grouting materials are formulated from special cement, mineral admixtures, additives (such as water-reducing agents and expanding agents), and water in a specific ratio. They possess high fluidity, micro-expansion, and early strength. After injection, they can fully fill the pores of the asphalt mixture matrix, forming a three-dimensional interpenetrating network structure. This results in a layer with compressive strength (compressive resilient modulus can reach 2200~2500MPa) and rutting resistance far exceeding those of ordinary asphalt mixtures. Interlayer bonding layer 4 is a high-performance adhesive layer. Material selection: SBS modified asphalt, rubberized asphalt, or high-performance modified emulsified asphalt are preferred. For critical projects, high-performance adhesive materials containing epoxy resin can be used to provide higher bond strength and shear resistance.

[0032] Construction control: The application rate needs to be precisely controlled, usually 0.8~1.5 kg / m² (emulsified asphalt) or 1.0~1.8 kg / m² (hot asphalt), to ensure the formation of a uniform, continuous and appropriately thick adhesive film, neither too much leading to bleeding nor too little leading to adhesion failure; For rigid base layer 1: For cement concrete base layers, the thickness is recommended to be no less than 20 cm. For continuously reinforced concrete (CRC) rigid base layer 1, parameters such as reinforcement ratio and crack spacing (optimal 1.5~2.0 meters) need to be specially designed to control the risk of edge breakage.

[0033] Specifically, it also includes implementation methods: S1. Original pavement treatment: Thoroughly clean and repair the original cement concrete pavement, and specially treat cracks and joints. If necessary, shot blasting technology can be used to roughen the surface, and then clean and dry it.

[0034] S2. Laying large-pore asphalt mixture matrix: On the treated rigid base course 1, pave large-pore asphalt mixture (such as OGFC-13) with a designed thickness of 4~6 cm, compact it, and control the porosity to about 28%. S3. Preparation and Grouting: Mix the cement-based grout according to the design ratio to ensure suitable fluidity. Use specialized grouting equipment to evenly inject the grout into the large-pore matrix until the grout fills the surface pores. Scrape off any excess grout from the surface. S4. Applying the bonding layer: After the injected composite layer 3 has been cured to the specified strength, SBS modified emulsified asphalt is evenly applied to its surface as the interlayer bonding layer 4, with an application rate of 1.2 kg / m². S5. Paving the wearing course: Immediately after the bonding layer demulsifies, pave a 3-4 cm thick high-elasticity modified SMA-13 ​​mixture as the high-elasticity modified asphalt wearing course 5, and compact it according to the specifications. S6. Open to traffic: Traffic can be opened after the road surface temperature has cooled to below 50°C; The modified road surface is smooth, skid-resistant, and low-noise. After multiple winter and summer cycles and heavy traffic tests, no obvious reflective cracks or ruts have appeared, demonstrating excellent overall performance. Example

[0035] Expansion joint 6 and drainage system: Trapezoidal cavity drainage strip 8 is installed in the expansion joint 6 of adjacent unit road modules. Sliding support strips can be installed inside. A bent plate 9 with water filter holes is installed at the opening of the drainage strip 8 and connected to the drainage pipe 7 pre-embedded in the base layer to form an active drainage system to prevent water retention and softening of the base layer.

[0036] The edge anchoring structure, by pre-embedding tie rods (such as threaded steel bars) on both sides of the subgrade skeleton, and anchoring the ends of the tie rods to the concrete shoulder blocks at the shoulder through connecting bolts and rubber pads, can effectively restrain the lateral displacement of the pavement structure and improve the overall stability.

[0037] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A rigid-flexible composite crack-resistant pavement structure, comprising a rigid base course (1), characterized in that: The rigid base layer (1) is laid with an infilled composite layer (3) and a high-elasticity modified asphalt wear layer (5) from bottom to top. An interlayer bonding layer (4) for adhesion is provided between the opposite surfaces of the infilled composite layer (3) and the high-elasticity modified asphalt wear layer (5), forming an integrated pavement structure with layered stacking. Expansion joints (6) are provided between the splicing joints of the integrated road structure. Drainage strips (8) are provided inside the expansion joints (6). Bending plates (9) are provided on the top of the drainage strips (8). Multiple filter holes are arranged in an array on the top of the bending plates (9). The bottom side of the drainage strips (8) and the drainage pipes (7) buried in the rigid base layer (1) form an active drainage channel. The rigid base layer (1) has several anchor sleeves (10) embedded in an array along its length direction. An anchor rod (2) for fixing is inserted inside the anchor sleeve (10), and the other end of the anchor rod (2) is anchored to one side of the shoulder block.

2. The rigid-flexible composite crack-resistant pavement structure according to claim 1, characterized in that: The drainage strip (8) has a trapezoidal cross-sectional shape, and the inner cavity of the drainage strip (8) is provided with a sliding support strip, which supports the top opening of the inner cavity of the drainage strip (8).

3. The rigid-flexible composite crack-resistant pavement structure according to claim 1, characterized in that: The infused composite layer (3) includes: A large-pore asphalt composite frame (301) is laid on top of the rigid base layer (1). The large-pore asphalt composite frame (301) has structural pores to increase the filling strength through the structural pores. The grouting reinforcement structure (302) is injected into the structural pores of the large-pore asphalt mixture frame (301).

4. The rigid-flexible composite crack-resistant pavement structure according to claim 3, characterized in that: The thickness of the macroporous asphalt composite framework (301) h Satisfy: 4cm≤ h The porosity of the macroporous asphalt composite framework (301) is 25%~30%, with a diameter of ≤6cm.

5. The rigid-flexible composite crack-resistant pavement structure according to claim 1, characterized in that: The rigid base layer (1) has several grooves arranged on its top array. The grooves have a rectangular cross-sectional shape. The infused composite layer (3) flows into the grooves for wedging before molding.

6. The rigid-flexible composite crack-resistant pavement structure according to claim 1, characterized in that: The interlayer bonding layer (4) includes a roughened structure layer, and a modified emulsified asphalt adhesive layer is connected to the top of the roughened structure layer. The modified emulsified asphalt adhesive layer is located on the bottom side of the high-elasticity modified asphalt wear layer (5).

7. The rigid-flexible composite crack-resistant pavement structure according to claim 1, characterized in that: The thickness of the high-elasticity modified asphalt wearing layer (5) h Satisfy: 6cm≤ h ≤12cm, the high-elasticity modified asphalt wear layer (5) includes an upper layer and a lower layer, and the thickness ratio of the lower layer to the upper layer is 1.4~1.8:

1.

8. The rigid-flexible composite crack-resistant pavement structure according to claim 7, characterized in that: The upper layer adopts a granular SBS modified asphalt concrete paving structure.

9. A rigid-flexible composite crack-resistant pavement structure according to claim 7, characterized in that: The lower layer is paved with medium-grained asphalt concrete.

10. The rigid-flexible composite crack-resistant pavement structure according to claim 1, characterized in that: The anchor sleeve (10) is embedded in the top groove of the rigid base layer (1) to stabilize the cross-linking strength of the injected composite layer (3) in the rigid base layer (1) through the anchor sleeve (10) and the anchor rod (2).

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