Asphalt composite road pavement structure

Abstract

The utility model discloses an asphalt composite road pavement structure relates to road pavement field, solves the combination design of waterproof layer and drainage system not enough perfect, and part drainage structure is easy to be blocked and fails, under multilayer composite structure, interlayer synergic work ability and overall life still need to strengthen, part adopts the pavement cost of special material to be higher, is not favorable to extensive popularization's problem. Technical features include: subgrade and base layer, the base layer is located on the surface of subgrade, and the base layer is full of the surface of subgrade, still include: the waterproof layer of laying on the surface of base layer, the functional layer of laying on the surface of waterproof layer, the bearing layer of laying on the surface of functional layer, the wearing layer of laying on the surface of bearing layer and the drainage structure of laying on the both sides of base layer, waterproof layer, functional layer, bearing layer and wearing layer. Can quickly lead away the water on the surface and the moisture of seepage into the structure layer inside, greatly reduced the damage of dynamic water pressure to the road, fundamentally reduced the water damage risk.

Description

Technical Field

[0001] This utility model relates to the field of road pavement technology, and in particular to asphalt composite road pavement structure. Background Technology

[0002] Asphalt composite road pavement structure is an important form of modern transportation infrastructure construction. By combining the performance advantages of different materials, it can achieve higher load-bearing capacity, durability and service efficiency. With the rapid growth of road traffic volume and the significant increase in vehicle axle load, traditional pavement structures have exposed a number of limitations in long-term use. In particular, when faced with heavy traffic, frequent braking and the impact of the natural environment, they are prone to structural damage and shorten the service life of the road.

[0003] In municipal roads, due to the large number of pedestrians and non-motorized vehicles, frequent speed-limited sections and traffic lights, vehicles often need to brake, especially at intersections. Sudden braking generates significant horizontal friction. This repeated horizontal load, combined with moisture infiltration, temperature changes, and vertical loads, can easily lead to slippage between the various structural layers of the road surface, resulting in cracks and accelerating the damage to the road structure. Furthermore, water damage is one of the key factors affecting the lifespan of the road surface. If the road surface is not waterproof or the drainage system is inadequate, moisture can penetrate into the interior of the road structure, generating dynamic water pressure under vehicle loads, softening the base layer, and exacerbating the formation and development of cracks.

[0004] To improve the anti-slip capacity between layers, existing technologies have attempted to incorporate anti-slip steel columns and plates into the subbase to enhance the overall integrity of each structural layer. In terms of drainage design, systems with drainage channels and filtration devices at the curb have emerged to quickly remove rainwater and prevent blockages. Furthermore, to improve pavement durability and adaptability to special environments, new materials and structures have been developed, such as flame-retardant asphalt mixtures for tunnel engineering, the incorporation of recycled asphalt mixtures (RAP) to reduce reflective cracking, and semi-flexible grouting composite materials to improve rutting resistance. However, limitations remain. The integration design of the waterproofing layer and drainage system is not perfect, some drainage structures are prone to blockage and failure, and the interlayer synergy and overall lifespan of multi-layer composite structures still need improvement. Some pavements using special materials are costly, hindering widespread adoption. Therefore, designing an asphalt composite road pavement structure is essential to address these issues. Utility Model Content

[0005] This invention aims to solve the technical problems of poor overall matching between the structural layers and the roadside drainage system in existing composite roads, as well as low interlayer collaborative working capacity and overall lifespan, and provides this asphalt composite road pavement structure.

[0006] To solve the above-mentioned technical problems, the specific technical solution of this utility model is as follows:

[0007] Asphalt composite road pavement structures include:

[0008] Roadbed and base course;

[0009] The base course is located on the upper surface of the roadbed, and the base course covers the entire upper surface of the roadbed;

[0010] Also includes:

[0011] A waterproof layer laid on the surface of the base layer, a functional layer laid on the surface of the waterproof layer, a load-bearing layer laid on the surface of the functional layer, a wear-resistant layer laid on the surface of the load-bearing layer, and drainage structures laid on both sides of the base layer, waterproof layer, functional layer, load-bearing layer, and wear-resistant layer.

[0012] The drainage structure includes: a set of drainage channels laid on both sides of the base layer, waterproof layer, functional layer, load-bearing layer and wear layer; several removable filter grilles installed on the upper surface of the set of drainage channels; several removable filter screens installed in the set of drainage channels; several water collection wells installed on the set of drainage channels; a first drainage component installed on each of the water collection wells; and a second drainage component installed on each of the drainage channels.

[0013] Several of the removable filter screens are arranged at equal intervals in a set of drainage channels, and rainwater enters the drainage channel and is discharged through the removable filter screens, the first drainage component and the second drainage component.

[0014] Preferably, the waterproof layer is a modified emulsified asphalt slurry waterproof layer.

[0015] Preferably, the functional layer is a rubber particle asphalt concrete layer.

[0016] Preferably, the load-bearing layer includes: a coarse-grained asphalt concrete layer and a high-modulus asphalt concrete layer;

[0017] The coarse-grained asphalt concrete layer is laid on the upper surface of the functional layer, and the high-modulus asphalt concrete layer is laid on the upper surface of the coarse-grained asphalt concrete layer.

[0018] Preferably, the wear layer is a rubber-modified fine-grained asphalt concrete wear layer.

[0019] Preferably, the water collection well includes: a well body and a well cover;

[0020] The manhole cover is hinged to the manhole body, and the manhole body is connected to a nearby drainage ditch.

[0021] Preferably, the first drainage component includes: a horizontal sinking pipe, a riser, and a filter cover;

[0022] The horizontal sinking pipe is connected to the well body, the riser is connected to the horizontal sinking pipe, and the riser passes through the functional layer, the load-bearing layer and the wear layer. The filter cover is installed on the upper surface of the riser, and the upper surface of the filter cover is flush with the wear layer.

[0023] Preferably, the second drainage assembly includes: a drainage housing and a filter grille;

[0024] The inner surface of the drainage ditch is provided with a rectangular opening that communicates with the functional layer. The drainage shell is fixedly installed at the rectangular opening, and the filter grille is installed inside the drainage shell.

[0025] This utility model has the following beneficial effects:

[0026] This asphalt composite pavement structure effectively prevents water infiltration and mitigates base layer softening and pumping caused by water damage by setting a dedicated waterproof layer (such as a modified emulsified asphalt slurry seal) on top of the base layer. The functional layers above (such as rubber-granulated asphalt concrete layers) have excellent elasticity, absorbing and dispersing stress and vibration from the base layer, significantly inhibiting the generation and development of reflective cracks. The load-bearing layer uses high-modulus asphalt concrete, greatly improving the overall rigidity and load-bearing capacity of the pavement, effectively resisting rutting and permanent deformation. This multi-layered combination of rigidity and flexibility strengthens the overall pavement structure and extends its service life. The uppermost wearing course uses rubber-modified fine-grained asphalt concrete, which not only has good wear resistance but also further enhances the pavement's structural integrity. The road structure integrates a complete drainage system on both sides, ensuring excellent skid resistance and smoothness for driving comfort and safety. This system diverts water to both sides via the road's cross slope, where it undergoes initial filtration through removable filter grilles and screens to prevent debris blockage. The water then enters the drainage ditch and is quickly drained away through collection wells, first drainage components (such as risers and filter covers), and second drainage components (such as drainage shells and filter grilles). This design achieves a combination of prevention and drainage, with drainage as the primary focus. It can quickly remove surface water and water that has seeped into the structural layer, greatly reducing the damage to the road surface caused by dynamic water pressure and fundamentally reducing the risk of water damage. Both the filter grilles and screens are removable, greatly facilitating daily cleaning and maintenance and ensuring the long-term effective operation of the drainage system. Attached Figure Description

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] Figure 1 This is a schematic diagram of the asphalt composite road pavement structure of this utility model.

[0029] Figure 2 This is a front view structural diagram of the asphalt composite road pavement structure of this utility model.

[0030] Figure 3 This is a partial front view of the asphalt composite road pavement structure of this utility model.

[0031] Figure 4 This is a top view of the asphalt composite road pavement structure of this utility model.

[0032] Figure 5 This is a partial schematic diagram of the asphalt composite road pavement structure of this utility model.

[0033] The reference numerals in the figure are:

[0034] 1. Subgrade; 2. Base course; 3. Waterproof layer; 4. Functional layer; 5. Load-bearing layer; 6. Wearing layer; 7. Drainage structure;

[0035] 51. Coarse-grained asphalt concrete layer; 52. High-modulus asphalt concrete layer.

[0036] 71. Drainage ditch; 72. Detachable filter grille; 73. Detachable filter screen; 74. Water collection well; 75. First drainage component; 76. Second drainage component;

[0037] Well body 741, well cover 742;

[0038] Horizontal sinking pipe 751, riser 752, filter cover 753;

[0039] Drainage housing 761, filter grille 762. Detailed Implementation

[0040] 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. It should be noted that, for ease of description, in this application, "left side" is referred to as "first end", "right side" as "second end", "upper side" as "first end", and "lower side" as "second end" in the current view. The purpose of such description is to clearly express the technical solution and should not be construed as an improper limitation of the technical solution of this application.

[0041] This utility model aims to address the technical problems in existing composite roads, such as poor overall matching between the structural layers and the drainage system at the curb, low interlayer coordination, and low overall lifespan. It provides an asphalt composite road pavement structure. The aforementioned technical problems are further broken down into the impact of existing technologies on the anti-slip capacity between layers. Specifically, existing technologies attempt to incorporate anti-slip steel columns and plates in the subbase to enhance the overall integrity of each structural layer. In terms of drainage design, systems with drainage channels and filtration devices at the curb have also emerged to quickly remove rainwater from the road surface and prevent blockages. Furthermore, to improve road... To enhance the durability and adaptability to special environments, new materials and structures have been developed, such as flame-retardant asphalt mixtures for tunnel engineering, reclaimed asphalt mixtures (RAP) to reduce reflective cracking, and semi-flexible grouting composite materials to improve rutting resistance. However, limitations still exist. The design of the combination of waterproof layer and drainage system is not perfect, some drainage structures are easily blocked and fail, and the interlayer synergy and overall lifespan of multi-layer composite structures still need to be strengthened. Some pavements using special materials have high costs, which are not conducive to widespread promotion. Therefore, this solution is provided: an asphalt composite road pavement structure.

[0042] Please see Figure 1-5 As shown, the asphalt composite road pavement structure includes: a subgrade 1 and a base course 2. The base course 2 is located on the upper surface of the subgrade 1 and covers the entire upper surface of the subgrade 1. It also includes: a waterproof layer 3 laid on the upper surface of the base course 2; a functional layer 4 laid on the upper surface of the waterproof layer 3; a load-bearing layer 5 laid on the upper surface of the functional layer 4; a wearing course 6 laid on the upper surface of the load-bearing layer 5; and drainage structures 7 laid on both sides of the base course 2, waterproof layer 3, functional layer 4, load-bearing layer 5, and wearing course 6. The drainage structure 7 includes: a set of materials laid on the base course 2, waterproof layer 3, functional layer 4, load-bearing layer 5, and wearing course 6. The drainage channels 71 on both sides of the layer 6, several removable filter grilles 72 installed on the upper surface of a group of drainage channels 71, several removable filter screens 73 installed in a group of drainage channels 71, several water collection wells 74 installed on a group of drainage channels 71, a first drainage component 75 installed on each water collection well 74, and a second drainage component 76 installed on each drainage channel 71. The several removable filter screens 73 are arranged at equal intervals in a group of drainage channels 71. Rainwater enters the drainage channel 71 and is discharged through the removable filter grilles 72, the first drainage component 75, and the second drainage component 76.

[0043] Waterproof layer 3 is a modified emulsified asphalt slurry waterproof layer.

[0044] Functional layer 4 is a rubber particle asphalt concrete layer.

[0045] The load-bearing layer 5 includes a coarse-grained asphalt concrete layer 51 and a high-modulus asphalt concrete layer 52. The coarse-grained asphalt concrete layer 51 is laid on the upper surface of the functional layer 4, and the high-modulus asphalt concrete layer 52 is laid on the upper surface of the coarse-grained asphalt concrete layer 51.

[0046] Wearing layer 6 is a rubber-modified fine-grained asphalt concrete wearing layer.

[0047] The original subgrade should be compacted to ensure that the rebound modulus of the top surface of subgrade 1 is not less than 30 MPa. For weak subgrade 1, it can be replaced with gravel or treated with lime. A graded crushed stone drainage cushion layer with a thickness of ≥15 cm should be set on the top of the subgrade to prevent groundwater erosion.

[0048] A cement-stabilized crushed stone base course 2 with a thickness of 20 cm is laid on the roadbed 1. It is laid in two layers of 10 cm each. The compaction degree of the base course 2 is ≥97%, and the slope error is controlled within ±0.2%.

[0049] Modified emulsified asphalt slurry seal is used as waterproof layer 3, with a spraying rate of 1.0~1.2 kg / m². Before construction, the base layer 2 must be thoroughly cleaned. After spraying, a dense film with a thickness of about 0.6~1.0 mm is formed, which effectively blocks water seepage, protects the strength of the base layer 2, and avoids collapse caused by water immersion.

[0050] A functional layer 4 is laid on top of the waterproof layer 3. This layer is preferably made of rubber particle asphalt concrete, with a thickness of 1-4 cm. The rubber particles with a particle size of 3-8 mm account for 5%-25%. This layer can effectively absorb vibration and stress, suppress reflective cracks, and reduce noise.

[0051] After the functional layer 4 passes the acceptance test, the load-bearing layer 5 is laid. The load-bearing layer 5 can adopt a double-layer design: first, lay a layer of coarse-grained asphalt concrete, such as AC-25C, with a thickness of about 8cm, as the lower layer; then lay a layer of high-modulus asphalt concrete, with a thickness of about 4-10cm, as the upper layer. High-modulus asphalt concrete has an extremely high dynamic modulus and is the main load-bearing layer. During construction, the functional layer must be cooled for 24 hours before the load-bearing layer 5 can be laid. The compaction must follow the principle of "high frequency and low amplitude".

[0052] The top layer is the wear course 6, which can be made of rubber-modified fine-grained asphalt concrete, such as AC-13C, with a thickness of about 1.5-5cm. This layer directly bears the wear of vehicle tires and the effects of natural factors, and should have good anti-skid, wear-resistant, and smooth properties. The cross slope of the road surface should be set as a herringbone slope, and the cross slope of the road surface should be set at 1.5% to facilitate drainage.

[0053] A set of longitudinal drainage channels 71 is pre-buried or constructed on both sides of the road. The top surface of the drainage channel 71 is equipped with a detachable filter screen 72 to prevent large debris from entering. Several detachable filter screens 73 are set at intervals along the length of the drainage channel 71 to filter the water flow in multiple stages and prevent siltation.

[0054] The water collection well 74 includes a well body 741 and a well cover 742. The well cover 742 is hinged to the well body 741, and the well body 741 is connected to the adjacent drainage ditch 71.

[0055] The first drainage component 75 includes: a horizontal sinking pipe 751, a riser 752, and a filter cover 753. The horizontal sinking pipe 751 is connected to the well body 741, and the riser 752 is connected to the horizontal sinking pipe 751. The riser 752 passes through the functional layer 4, the load-bearing layer 5, and the wear layer 6. The filter cover 753 is installed on the upper surface of the riser 752, and the upper surface of the filter cover 753 is flush with the wear layer 6.

[0056] Along the length of the drainage ditch 71, water collection wells 74 are set at intervals between adjacent drainage ditches. Each water collection well 74 consists of a well body 741 and a hinged well cover 742, and is connected to the drainage ditch 71. The water collection well 74 is connected to the first drainage component 75, which includes a transverse sinking pipe 751, a riser 752, and a filter cover 753. One end of the transverse sinking pipe 751 is connected to the water collection well 74, and the other end extends into the road. The riser 752 is connected above it. The riser 752 passes vertically upward through each structural layer, and its top outlet is flush with the upper surface of the wear layer 6. A filter cover 753 with long filter holes is fastened on it. Water accumulated on the road surface can quickly enter the riser 752 through the filter cover 753, flow into the transverse sinking pipe 751, and finally be discharged into the water collection well 74. Preferably, the water collection wells 74 are arranged alternately on both sides of the road, and the transverse sinking pipe 751 is provided with a certain slope to facilitate the flow.

[0057] The second drainage component 76 includes a drainage housing 761 and a filter grille 762. The inner surface of the drainage channel 71 is provided with a rectangular opening that communicates with the functional layer 4. The drainage housing 761 is fixedly installed at the rectangular opening, and the filter grille 762 is installed inside the drainage housing 761.

[0058] A rectangular opening is made on the side wall of the drainage ditch 71 at a position corresponding to the height of the functional layer 4, and a drainage shell 761 is installed thereon. A filter screen 762 is also provided inside the drainage shell 761. Water that seeps into the pavement structure layer can be collected and guided into the drainage ditch 71 through this component as it flows toward the shoulder.

[0059] The water collected in drainage ditch 71 and collection well 74 is eventually discharged outside the road through the main drainage pipe buried in the roadbed 1, thus achieving orderly drainage management.

[0060] This utility model prevents water seepage through the waterproof layer 3, absorbs stress and vibration through the functional layer 4, bears the main load through the load-bearing layer 5, and provides a good road surface through the wear layer 6. When it rains, some rainwater flows along the cross slope of the road surface and through the surface of the wear layer 6 to both sides, and enters the riser 752 for rapid discharge through the filter cover 753 of the first drainage component 75. Another part of the rainwater is discharged from the inside of the road structure through the second drainage component 76. All water flows are finally collected through the drainage ditch 71 and the collection well 74, and then discharged through the main drainage pipe. The detachable filter grille 72 and the detachable filter screen 73 facilitate regular cleaning and maintenance, ensuring that the drainage system is unobstructed and effective for a long time.

[0061] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. Asphalt composite road pavement structure, including: The roadbed (1) and the base course (2), wherein the base course (2) is located on the upper surface of the roadbed (1) and the base course (2) covers the entire upper surface of the roadbed (1), characterized in that it further comprises: A waterproof layer (3) is laid on the upper surface of the base layer (2); Functional layer (4) laid on the upper surface of the waterproof layer (3); The load-bearing layer (5) is laid on the upper surface of the functional layer (4); The wear layer (6) laid on the upper surface of the load-bearing layer (5); and Drainage structure (7) laid on both sides of the base layer (2), waterproof layer (3), functional layer (4), load-bearing layer (5) and wear layer (6); The drainage structure (7) includes: a set of drainage channels (71) laid on both sides of the base layer (2), waterproof layer (3), functional layer (4), load-bearing layer (5) and wear layer (6); a number of detachable filter grilles (72) installed on the upper surface of the set of drainage channels (71); a number of detachable filter screens (73) installed in the set of drainage channels (71); a number of water collection wells (74) installed on the set of drainage channels (71); a first drainage component (75) installed on each of the water collection wells (74); and a second drainage component (76) installed on each of the drainage channels (71). Several of the removable filter screens (73) are arranged at equal intervals in a set of drainage channels (71), and rainwater enters the drainage channel (71) and is discharged through the removable filter screen (72), the first drainage component (75) and the second drainage component (76).

2. The asphalt composite road pavement structure as described in claim 1, characterized in that, The waterproof layer (3) is a modified emulsified asphalt slurry waterproof layer.

3. The asphalt composite road pavement structure as described in claim 1, characterized in that, The functional layer (4) is a rubber particle asphalt concrete layer.

4. The asphalt composite road pavement structure as described in claim 1, characterized in that, The load-bearing layer (5) includes: a coarse-grained asphalt concrete layer (51) and a high-modulus asphalt concrete layer (52). The coarse-grained asphalt concrete layer (51) is laid on the upper surface of the functional layer (4), and the high-modulus asphalt concrete layer (52) is laid on the upper surface of the coarse-grained asphalt concrete layer (51).

5. The asphalt composite road pavement structure as described in claim 1, characterized in that, The wear layer (6) is a rubber-modified fine-grained asphalt concrete wear layer.

6. The asphalt composite road pavement structure as described in claim 1, characterized in that, The water collection well (74) includes: a well body (741) and a well cover (742); The manhole cover (742) is hinged to the manhole body (741), and the manhole body (741) is connected to the adjacent drainage ditch (71).

7. The asphalt composite road pavement structure as described in claim 6, characterized in that, The first drainage component (75) includes: a horizontal sink pipe (751), a riser pipe (752), and a filter cover (753); The horizontal sinking pipe (751) is connected to the well body (741), the riser (752) is connected to the horizontal sinking pipe (751), and the riser (752) passes through the functional layer (4), the load-bearing layer (5) and the wear layer (6). The filter cover (753) is installed on the upper surface of the riser (752), and the upper surface of the filter cover (753) is flush with the wear layer (6).

8. The asphalt composite road pavement structure as described in claim 7, characterized in that, The second drainage assembly (76) includes: a drainage housing (761) and a filter grille (762); The inner surface of the drainage channel (71) is provided with a rectangular opening that communicates with the functional layer (4). The drainage shell (761) is fixedly installed at the rectangular opening, and the filter grid (762) is installed inside the drainage shell (761).

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