Ultra-thin surface-coated high-elasticity asphalt pavement structure

Abstract

The utility model discloses a kind of ultra-thin cover high extensional elastic pitch pavement structure, it is related to the pavement preventive maintenance and functional promotion technical field in road engineering, including pavement foundation, pavement foundation top is sequentially laid from bottom to top with lower load bearing base, upper load bearing base and upper surface layer, and upper load bearing base is provided with the intermediate layer for adhesion between upper surface layer, form laminated integrated pavement structure of stacking;The utility model is by being arranged in array distribution on pavement foundation Insert slot, and in the insert slot insertion bearing column rod, lower load bearing base and upper load bearing base are laid to it, and the wavy contact surface between lower load bearing base and upper load bearing base, so that the pressure borne by upper surface layer is decomposed through wavy contact surface, on the other hand, part of the pressure borne by lower load bearing base is transferred to bearing column rod, two aspects weaken the pressure borne by upper surface layer and then prolong the service life of upper surface layer.

Description

Technical Field

[0001] This utility model relates to the field of preventive maintenance and functional improvement technology of road surface in road engineering, and in particular to an ultra-thin overlay high-elasticity asphalt pavement structure. Background Technology

[0002] Traditional asphalt pavements will develop problems such as cracking, rutting, and reduced skid resistance after long-term use. When maintaining them, conventional overlay technology requires a large paving thickness (usually 4 cm or more), which not only consumes a lot of materials and has a significant impact on road elevation and surrounding facilities, but also has a long construction period and serious traffic disruption.

[0003] Existing ultra-thin overlay technologies reduce the thickness to about 2.5 cm, allowing the subgrade beneath the high-elasticity asphalt pavement to primarily bear the pressure of vehicle traffic during use. Therefore, the load-bearing capacity of the subgrade structure is particularly important. Conventional subgrade structures are directly constructed with cement to form rigid supports, which are prone to damage over time, making them unsuitable for the long-term use of ultra-thin overlay high-elasticity asphalt pavements.

[0004] In view of this, this application proposes an ultra-thin overlay high-elasticity asphalt pavement structure. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an ultra-thin overlay high-elasticity asphalt pavement structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An ultra-thin overlay high-elasticity asphalt pavement structure includes a pavement subbase, on which a lower load-bearing base layer, an upper load-bearing base layer and a top layer are laid sequentially from bottom to top, and an intermediate layer for bonding is provided between the upper load-bearing base layer and the top layer, forming a layered stacked integrated pavement structure. A geogrid is installed inside the integrated pavement structure. The geogrid includes load-bearing columns and a mesh. Several insertion slots arranged in a rectangular array are opened on the pavement foundation, and a load-bearing column is inserted into each insertion slot. The top of the load-bearing column extends to the top of the lower load-bearing base and abuts against the lower surface of the lower load-bearing base. Multiple load-bearing columns are connected by a mesh, and the mesh is set to fit the upper surface of the pavement foundation.

[0007] As a further preferred embodiment of this technical solution, the bearing column is made of HRB335 steel bars, and the length of the bearing column embedded in the roadbed is set to be at least 8cm.

[0008] As a further preferred embodiment of this technical solution, the mesh is made of a mesh structure woven from multiple strands of iron wire, and the connection between the mesh and the supporting column is made by a collar or cable tie.

[0009] As a further preferred embodiment of this technical solution, the inner diameter of the insertion slot matches the outer diameter of the bearing column, and the multiple bearing columns are vertically distributed.

[0010] As a further preferred embodiment of this technical solution, the contact surface between the lower load-bearing base layer and the upper load-bearing base layer is set to a wave shape, and the load-bearing column is set at the crest position of the wave shape on the upper surface of the lower load-bearing base layer.

[0011] As a further preferred embodiment of this technical solution, the outer side of the integrated pavement structure is provided with a roadside slope protection, and the integrated pavement structure and the roadside slope protection are closely fitted together.

[0012] As a further preferred embodiment of this technical solution, the lower load-bearing base layer adopts a low-dose water-stabilized crushed stone paving structure.

[0013] As a further preferred embodiment of this technical solution, the upper load-bearing base layer adopts an LSM-25 coarse-grained asphalt macadam paving structure.

[0014] As a further preferred embodiment of this technical solution, the intermediate layer adopts a Sup20 medium-grained modified asphalt paving structure.

[0015] As a further preferred embodiment of this technical solution, the upper layer adopts an SMA-13 ​​modified asphalt paving structure, and the thickness of the upper layer is... h Satisfy: 0.8cm≤ h ≤2.5cm.

[0016] This utility model has the following beneficial effects: This invention involves creating an array of interlocking slots in the road subgrade, inserting load-bearing columns into these slots, and connecting adjacent load-bearing columns with a mesh. A lower and upper load-bearing base course are then laid within this network. The lower load-bearing base courses are interconnected via the mesh, creating compression between them and the load-bearing columns. Furthermore, the wavy contact surface between the lower and upper load-bearing base courses distributes the pressure on the upper layer, reducing the pressure on both the lower and upper subgrades. Simultaneously, the compression between the lower and upper load-bearing base courses transfers some of the pressure to the load-bearing columns. These two aspects weaken the pressure on the upper layer and conversely enhance its load-bearing capacity, thereby increasing the overall load-bearing capacity of the integrated pavement structure and extending the service life of the upper layer. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an ultra-thin overlay high-elasticity asphalt pavement structure proposed in this utility model.

[0018] Figure 2 This is a schematic diagram of the internal structure of an ultra-thin overlay high-elasticity asphalt pavement structure proposed in this utility model.

[0019] Figure 3 This is a schematic diagram of a geogrid for an ultra-thin overlay high-elasticity asphalt pavement structure proposed in this utility model.

[0020] In the diagram: 1. Roadbed; 2. Geogrid; 3. Lower load-bearing base course; 4. Upper load-bearing base course; 5. Intermediate layer; 6. Top layer. Detailed Implementation

[0021] 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.

[0022] This utility model provides the following technical solution: like Figures 1 to 3 As shown, an ultra-thin overlay high-elasticity asphalt pavement structure includes a pavement base 1. The top of the pavement base 1 is laid with a lower load-bearing base 3, an upper load-bearing base 4 and a top layer 6 from bottom to top. An intermediate layer 5 for bonding is provided between the upper load-bearing base 4 and the top layer 6 to form an integrated pavement structure with layered stacking. A geogrid 2 is installed inside the integrated pavement structure. The geogrid 2 includes load-bearing columns and a mesh. Several insertion slots are provided on the pavement foundation 1 in a rectangular array. Each insertion slot is used to insert a load-bearing column. The top of the load-bearing column extends to the top of the lower load-bearing base 3 and abuts against the lower surface of the lower load-bearing base 3. Multiple load-bearing columns are connected by a mesh, and the mesh is set to fit the upper surface of the pavement foundation 1.

[0023] In the specific embodiments provided in this application, the supporting column is made of HRB335 steel bar, and the length of the supporting column embedded in the road foundation 1 is set to at least 8cm.

[0024] In the specific embodiments provided in this application, the mesh is a mesh structure woven from multiple strands of iron wire, and the connection between the mesh and the supporting column is made by a collar or cable tie.

[0025] In the specific embodiments provided in this application, the inner diameter of the insertion slot matches the outer diameter of the bearing column, and multiple bearing columns are vertically distributed.

[0026] The contact surface between the lower load-bearing base layer 3 and the upper load-bearing base layer 4 is set to be wavy, and the load-bearing column is set at the crest position of the wavy upper surface of the lower load-bearing base layer 3.

[0027] In the specific embodiments provided in this application, a roadside slope is provided on the outer side of the integrated pavement structure, and the integrated pavement structure is closely fitted with the roadside slope.

[0028] This application provides a basic embodiment of an integrated pavement structure, namely, the lower load-bearing base course 3 adopts a low-dosage water-stabilized crushed stone paving structure; the upper load-bearing base course 4 adopts an LSM-25 coarse-grained asphalt crushed stone paving structure; the intermediate layer 5 adopts a Sup20 medium-grained modified asphalt paving structure; and the upper layer 6 adopts an SMA-13 ​​modified asphalt paving structure, and the thickness of the upper layer 6 is... h Satisfy: 0.8cm≤ h ≤2.5cm.

[0029] 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

[0030] Excavate a recessed foundation of the corresponding depth on the road surface foundation 1, measure the spacing on the recessed foundation and drill insertion slots, and ensure that the depth of the insertion slots is not less than 8cm. Then, insert a bearing column into each insertion slot. The bearing columns are made of HRB335 steel bars, and each bearing column is connected by a mesh, ensuring that each mesh is in close contact with the recessed foundation.

[0031] Subsequently, low-dose water-stabilized crushed stone is first laid into the roadbed 1 and compacted to ensure that its upper surface is wavy to form the lower load-bearing base 3. Special attention is paid to checking whether there are gaps between the lower load-bearing base 3 and the geogrid 2 mesh to avoid affecting the load-bearing effect of the lower load-bearing base 3. Then, LSM-25 coarse-grained asphalt crushed stone is laid on the lower load-bearing base 3 and compacted again to form the upper load-bearing base 4. At the same time, it is ensured that the upper surface of the upper load-bearing base 4 is flush with the load-bearing columns of the geogrid 2, so that the contact surface between the lower load-bearing base 3 and the upper load-bearing base 4 is wavy, in order to enhance the load-bearing strength of the lower load-bearing base 3 and the upper load-bearing base 4. Example

[0032] The intermediate layer 5 is laid using high-performance bonding materials, such as high-performance modified emulsified asphalt, which is typically composed of slow-setting, fast-curing cationic modified emulsified asphalt, high-viscosity SBS modified asphalt, rubber asphalt, etc. During preparation, modifiers such as styrene-butadiene-styrene block copolymer (SBS) and waterborne epoxy resin can be added to form a tough asphalt film after demulsification. The application rate is generally controlled at 0.8-1.5 kg / m² (for emulsified asphalt) or 1.0-2.0 kg / m² (for hot asphalt) to ensure sufficient wetting of the original pavement and interlocking bonding with the upper abrasive layer.

[0033] The top layer 6 uses a specially designed high-ductility and high-elasticity asphalt mixture, employing high-viscosity and high-elasticity composite modified asphalt as the binder. A typical formulation includes: 85-89 parts heavy-duty asphalt, 2-4 parts aromatic oil ductile agent, 3-4 parts high-viscosity toughening modifier, 6-7 parts thermoplastic rubber modifier (such as SBS), and a small amount of sulfide stabilizer. This composite modification gives the asphalt sufficient fluidity for easy construction at high temperatures, while exhibiting extremely high viscosity, toughness, and elasticity at room temperature and service temperature.

[0034] Asphalt mixture design and gradation: The mixture adopts a continuous semi-open gradation design, with the porosity controlled between 6% and 12%. This gradation avoids the shortcomings of insufficient structural depth in dense gradation and overcomes the drawbacks of poor durability in open gradation. Hard, wear-resistant diabase or basalt is selected as aggregate, strictly graded according to particle size. For example, for a 1.0-1.5 cm overlay, 3-5 mm crushed stone can be used as the main skeleton. In addition, functional additives such as polydimethyl silicone oil (15-20 parts) and nano-white clay (30-40 parts) can be added to further improve the mixture's resistance to water damage and low-temperature toughness.

[0035] 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 thin-surfaced, high-elasticity asphalt pavement structure, comprising a pavement subgrade (1), characterized in that: The roadbed (1) is laid with a lower load-bearing base layer (3), an upper load-bearing base layer (4) and a top layer (6) from bottom to top, and an intermediate layer (5) for bonding is provided between the upper load-bearing base layer (4) and the top layer (6), forming an integrated road structure with layered stacking; A geogrid (2) is installed inside the integrated pavement structure. The geogrid (2) includes a load-bearing column and a mesh. Several insertion slots are provided on the pavement foundation (1) in a rectangular array. A load-bearing column is inserted into each insertion slot. The top of the load-bearing column extends to the top of the lower load-bearing base (3) and abuts against the lower surface of the lower load-bearing base (3). Multiple load-bearing columns are connected by a mesh, and the mesh is set in close contact with the upper surface of the pavement foundation (1).

2. The ultra-thin overlay high-elasticity asphalt pavement structure according to claim 1, characterized in that: The bearing column is made of HRB335 steel bars, and the length of the bearing column embedded in the road foundation (1) is set to at least 8cm.

3. The ultra-thin overlay high-elasticity asphalt pavement structure according to claim 1, characterized in that: The mesh is made of a mesh structure woven from multiple strands of iron wire, and the connection between the mesh and the supporting column is made by a collar or cable tie.

4. The ultra-thin overlay high-elasticity asphalt pavement structure according to claim 1, characterized in that: The inner diameter of the insertion slot matches the outer diameter of the bearing column, and multiple bearing columns are vertically distributed.

5. The ultra-thin overlay high-elasticity asphalt pavement structure according to claim 1, characterized in that: The contact surfaces of the lower load-bearing base (3) and the upper load-bearing base (4) are set in a wave shape, and the bearing column is set at the crest position of the wave shape on the upper surface of the lower load-bearing base (3).

6. The ultra-thin overlay high-elasticity asphalt pavement structure according to claim 1, characterized in that: The integrated pavement structure has a roadside slope protection on its outer side, and the integrated pavement structure is closely fitted with the roadside slope protection.

7. The ultra-thin overlay high-elasticity asphalt pavement structure according to claim 1, characterized in that: The underlying load-bearing base layer (3) adopts a low-dose water-stabilized crushed stone paving structure.

8. The ultra-thin overlay high-elasticity asphalt pavement structure according to claim 1, characterized in that: The upper load-bearing base (4) adopts LSM-25 coarse-grained asphalt macadam paving structure.

9. The ultra-thin overlay high-elasticity asphalt pavement structure according to claim 1, characterized in that: The intermediate layer (5) adopts the Sup20 medium-grained modified asphalt paving structure.

10. The ultra-thin overlay high-elasticity asphalt pavement structure according to claim 1, characterized in that: The upper layer (6) adopts an SMA-13 ​​modified asphalt paving structure, and the thickness of the upper layer (6) is... h Satisfy: 0.8cm≤ h ≤2.5cm.

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