Durable anti-rutting asphalt pavement widening structure

Abstract

The utility model relates to a kind of durable anti-rut asphalt pavement wide-splicing structure, belong to asphalt pavement structure technical field, including the wide-splicing pavement being set in old road pavement side, wide-splicing pavement includes the wide-splicing roadbed layer, wide-splicing rubber powder modified water-stable macadam lower base course, wide-splicing water-stable macadam upper base course, cement concrete surface layer, lower layer, anti-rut interlayer and upper layer being sequentially arranged from bottom to top, the upper portion of cement concrete surface layer is equipped with continuous reinforcement, cement concrete surface layer, lower layer, anti-rut interlayer and upper layer all extend to the upper of old road macadam upper base course, and old road macadam upper base course and old road macadam lower base course are equipped with wide-splicing platform at wide-splicing place.The utility model can significantly improve surface layer high-temperature stability, resist permanent deformation produced by repeated action of heavy load vehicle;Old road and wide-splicing pavement upper are all set cement concrete surface layer and are equipped with continuous reinforcement inside, enhance the crack resistance of cement concrete surface layer.

Description

Technical Field

[0001] This utility model relates to a durable, rutting-resistant asphalt pavement widening structure, belonging to the technical field of asphalt pavement structure. Background Technology

[0002] In the reconstruction and expansion of first-class highways, sections such as traffic light-controlled intersections and speed checkpoints are prone to rutting due to the frequent braking and acceleration of large vehicles and the repeated impact of heavy-duty vehicles (such as extra-large trucks and container trucks), which seriously affects the service life of the road surface and driving safety. Although modern widened pavements also incorporate anti-rutting and pavement-stabilizing structures, traditional widening structures often have the following problems: as newly opened traffic areas, the asphalt surface layer is prone to rutting deformation under the repeated impact of heavy-duty vehicles; the base layer of the widened road uses conventional water-stabilized crushed stone materials, which are prone to shrinkage cracks under the influence of temperature and humidity changes, which reflect onto the surface layer and reduce pavement durability. Utility Model Content

[0003] This invention provides a durable, rutting-resistant asphalt pavement widening structure, solving the problems existing in the background art.

[0004] This utility model relates to a durable, rutting-resistant asphalt pavement widening structure, including a widened pavement located next to the existing road surface. The widened pavement includes, from bottom to top, a widened subgrade, a widened rubber powder modified water-stabilized crushed stone lower base course, a widened water-stabilized crushed stone upper base course, a cement concrete surface course, a lower layer, a rutting-resistant interlayer, and a top layer. The rutting-resistant interlayer is a high-modulus asphalt concrete layer. The upper part of the cement concrete surface course is continuously reinforced. The cement concrete surface course, lower layer, rutting-resistant interlayer, and top layer all extend above the existing crushed stone upper base course. The existing crushed stone upper base course and the existing crushed stone lower base course are provided with a widening platform at the widening point. The inner end of the widened water-stabilized crushed stone upper base course extends to the widening platform.

[0005] As a preferred design, the widened water-stabilized crushed stone upper base course is flush with the existing crushed stone upper base course, the widened rubber powder modified water-stabilized crushed stone lower base course is flush with the existing crushed stone lower base course, and the widened subgrade is flush with the existing subgrade. This flush design between each widened structural layer and its corresponding existing layer eliminates stress concentration caused by interlayer steps, preventing impact loads on the joints during vehicle traffic. Simultaneously, it ensures uniform stress distribution between the new and old pavement structures, reduces uneven settlement due to differences in layer thickness, improves pavement smoothness and driving comfort, and extends the structural service life.

[0006] As a preferred option, polyester fiber cloth is laid above the joint between the widened water-stabilized crushed stone upper base and the old road crushed stone upper base. The polyester fiber cloth has good tensile strength and flexibility. When laid above the joint, it can effectively inhibit the reflection and propagation of cracks in the base layer, thereby reducing the generation of longitudinal cracks at the joint and improving the structural durability of the joint.

[0007] As a preferred embodiment, a bonding layer is provided between adjacent layers of cement concrete surface layer, lower layer, anti-rutting interlayer, and upper layer. The bonding layer is an emulsified asphalt bonding layer or a modified asphalt bonding layer. The upper layer is an SBS modified asphalt mastic aggregate mixture layer, and the lower layer is a recycled SBS modified asphalt concrete layer. The bonding layer prevents interlayer slippage and prevents "shove rutting".

[0008] As a preferred embodiment, continuous reinforcement includes multiple transverse reinforcing bars. Longitudinal reinforcing bars are fixed to the bottom of the transverse reinforcing bars, and multiple supporting bars are located below the longitudinal reinforcing bars. The tops of the supporting bars are fixed at the intersection of the transverse and longitudinal reinforcing bars. The transverse and longitudinal reinforcing bars form a mesh-like load-bearing skeleton, which can significantly improve the flexural strength and deformation resistance of the cement concrete surface layer, resisting the bending stress caused by heavy vehicles. The supporting bars provide fixed support at the intersection of the transverse and longitudinal reinforcing bars, facilitating the reinforcement layout.

[0009] As a preferred embodiment, a support member is fixed to the top of the support bar, and the top of the support member is provided with a longitudinal support groove that cooperates with the longitudinal reinforcement. On both sides of the top of the longitudinal support groove, there are transverse support grooves that cooperate with the transverse reinforcement, so as to facilitate the support of the longitudinal and transverse reinforcement.

[0010] As a preferred embodiment, a limiting nail is inserted into the polyester fiber cloth. The limiting nail has a limiting disc at its top and an anti-detachment hook on its outer side wall. The limiting nail can firmly fix the polyester fiber cloth to the base surface, preventing the cloth from shifting or wrinkling during construction and ensuring its anti-cracking function is effectively performed. The anti-detachment hook can enhance the interlocking force between the limiting nail and the base material, and better prevent detachment.

[0011] As a preferred option, a cement slurry layer is applied to the sidewalls of the joints between the widened water-stabilized crushed stone upper base course and the old road crushed stone upper base course, as well as the sidewalls of the joints between the widened rubber powder modified water-stabilized crushed stone lower base course and the old road crushed stone lower base course. The cement slurry layer can fill the tiny gaps in the sidewalls of the joints, enhance the interfacial adhesion between the new and old base course materials, and improve the overall strength of the joint.

[0012] As a preferred option, a geogrid is installed between the lower base course of the widened rubber powder modified water-stabilized crushed stone and the upper base course of the widened water-stabilized crushed stone, with the inner end of the geogrid extending to the widening platform. The geogrid possesses excellent tensile strength, which can enhance the overall stiffness and deformation resistance of the widened base course.

[0013] This utility model has the following beneficial effects: The anti-rutting interlayer uses a high-modulus asphalt concrete layer, which can significantly improve the high-temperature stability of the surface layer and resist permanent deformation caused by repeated heavy-load vehicles. The old road crushed stone upper base and the old road crushed stone lower base are equipped with a widening platform at the widening point. The inner end of the widened water-stabilized crushed stone upper base extends to the widening platform to realize the stepped overlap of the base layer. Both the old road and the widened road surface are equipped with cement concrete surface layer with continuous reinforcement inside to enhance the crack resistance of the cement concrete surface layer. Together with the asphalt surface layer, a rigid-flexible composite pavement structure is formed, which has the characteristics of asphalt pavement driving comfort and low noise, as well as the characteristics of cement pavement high strength, load-bearing capacity and good stability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Partial structural diagram; Figure 3 A schematic diagram of the top structure at the connection between the support member and the transverse and longitudinal reinforcing bars; Figure 4 for Figure 2 Enlarged structural diagram at point A; In the diagram: 1. Top layer; 2. Anti-rutting interlayer; 3. Bottom layer; 4. Cement concrete surface layer; 5. Transverse reinforcement; 6. Longitudinal reinforcement; 7. Support reinforcement; 8. Polyester fiber cloth; 9. Support component; 10. Widened water-stabilized crushed stone upper base course; 11. Longitudinal support groove; 12. Old road crushed stone upper base course; 13. Old road crushed stone lower base course; 14. Old road subgrade; 15. Widened subgrade; 16. Geogrid; 17. Widened rubber powder modified water-stabilized crushed stone lower base course; 18. Bonding layer; 19. Transverse support groove; 20. Limiting nail; 21. Anti-detachment hook. Detailed Implementation

[0015] The present invention will be further described below with reference to the embodiments.

[0016] Example 1, as Figures 1 to 4 As shown, this utility model is a durable, rutting-resistant asphalt pavement widening structure, including a widened pavement set next to the old road surface. The widened pavement includes, from bottom to top, a widened subgrade layer 15, a widened rubber powder modified water-stabilized crushed stone lower base course 17, a widened water-stabilized crushed stone upper base course 10, a cement concrete surface layer 4, a lower layer 3, a rutting-resistant interlayer 2, and an upper layer 1. The rutting-resistant interlayer 2 is a high-modulus asphalt concrete layer. The upper part of the cement concrete surface layer 4 is continuously reinforced. The cement concrete surface layer 4, the lower layer 3, the rutting-resistant interlayer 2, and the upper layer 1 all extend above the old road crushed stone upper base course 12. The old road crushed stone upper base course 12 and the old road crushed stone lower base course 13 are provided with a widening platform at the widening point. The inner end of the widened water-stabilized crushed stone upper base course 10 extends to the widening platform.

[0017] During construction, the old road is treated as follows: the hard shoulder of the old road is milled to the design width platform size, the surface layer of the old road surface is milled away, exposing the old road crushed stone upper base course 12, and a stepped width platform is formed between the old road crushed stone upper base course 12 and the old road crushed stone lower base course 13. Construction of the widened roadbed layer 15: Excavate, backfill and compact the roadbed in the widened area, with a compaction degree of ≥96%, and make it flush with the old roadbed layer 14. The backfilling is done in layers and compacted. Subbase construction: Spread and widen rubber powder modified water-stabilized crushed stone subbase 17, compact it to a compaction degree ≥97%, and make it flush with the old road crushed stone subbase 13; Upper base course construction: Lay the widened water-stabilized crushed stone upper base course 10, extending the inner end to the widened platform, flush with the old road crushed stone upper base course 12, and compact it to a compaction degree ≥97%; Construction of cement concrete surface layer 4: Tie continuous reinforcement, pour C30 cement concrete, vibrate to compact and then cure. Surface layer construction: Lay the lower layer 3, anti-rutting interlayer 2 and upper layer 1. The rolling temperature of each layer meets the specifications to ensure that the compaction degree meets the standards.

[0018] Example 2: Based on Example 1, the widened water-stabilized crushed stone upper base course 10 is flush with the old road crushed stone upper base course 12, the widened rubber powder modified water-stabilized crushed stone lower base course 17 is flush with the old road crushed stone lower base course 13, and the widened roadbed layer 15 is flush with the old roadbed layer 14.

[0019] Polyester fiber cloth 8 is installed above the joint between the wide water-stabilized crushed stone upper base layer 10 and the old road crushed stone upper base layer 12.

[0020] A bonding layer 18 is provided between adjacent layers of cement concrete surface layer 4, lower layer 3, anti-rutting interlayer 2, and upper layer 1. The bonding layer 18 is an emulsified asphalt tack coat or a modified asphalt tack coat. Upper layer 1 is an SBS modified asphalt mastic aggregate mixture layer, and lower layer 3 is a recycled SBS modified asphalt concrete layer. The thickness of upper layer 1 is 3cm, using SBS modified asphalt mastic aggregate mixture (SMA-13). The thickness of anti-rutting interlayer 2 is 4cm, using high modulus asphalt concrete (HMAC-16). The thickness of lower layer 3 is 6cm, using recycled SBS modified asphalt concrete (AC-20C). The interlayer interface is a weak point, and it is necessary to spray emulsified asphalt tack coat or modified asphalt tack coat to form bonding layer 18 to avoid interlayer slippage and prevent "shove rutting".

[0021] The continuous reinforcement includes multiple transverse steel bars 5, with longitudinal steel bars 6 fixed at the bottom of the transverse steel bars 5. Multiple supporting bars 7 are located below the longitudinal steel bars 6, and the tops of the supporting bars 7 are fixed at the intersection of the transverse steel bars 5 and the longitudinal steel bars 6. The cement concrete surface layer 4 is 20cm thick, with a strength grade of C30. In the continuous reinforcement, the transverse steel bars 5 and the longitudinal steel bars 6 are made of threaded steel, and the supporting bars 7 are also made of threaded steel. The thickness of the widened water-stabilized crushed stone upper base layer 10 is 18cm, and the thickness of the widened rubber powder modified water-stabilized crushed stone lower base layer 17 is 18cm, with a rubber powder content of 8-10% of the aggregate mass ratio.

[0022] A support member 9 is fixed to the top of the support bar 7. The top of the support member 9 is provided with a longitudinal support groove 11 that cooperates with the longitudinal reinforcement bar 6. The top sides of the longitudinal support groove 11 are provided with transverse support grooves 19 that cooperate with the transverse reinforcement bar 5. When the continuous reinforcement is tied, the longitudinal reinforcement bar 6 is fixed to the bottom of the transverse reinforcement bar 5. Then the support member 9 is supported at the intersection of the longitudinal reinforcement bar 6 and the transverse reinforcement bar 5 and then welded and fixed. The bottom of the support bar 7 is supported on the widened water-stabilized crushed stone upper base course 10 and the old road crushed stone upper base course 12. The longitudinal reinforcement bar 6 is about 9cm below the lower layer 3.

[0023] A limiting nail 20 is inserted into the polyester fiber cloth 8. The top of the limiting nail 20 is equipped with a limiting disc, and the outer wall of the limiting nail 20 is equipped with an anti-disengagement hook 21. When the polyester fiber cloth 8 is in place, its width is 200cm. The width of the polyester fiber cloth 8 on the widened water-stabilized crushed stone upper base layer 10 is greater than the width on the old road crushed stone upper base layer 12. The polyester fiber cloth 8 is fixed and tightened using the limiting nail 20.

[0024] Cement slurry was applied to the sidewalls at the joints of the widened water-stabilized crushed stone upper base course 10 and the old road crushed stone upper base course 12, as well as the sidewalls at the joints of the widened rubber powder modified water-stabilized crushed stone lower base course 17 and the old road crushed stone lower base course 13. Cement slurry was applied to the sidewalls at the joints during the construction of both the widened water-stabilized crushed stone upper base course 10 and the widened rubber powder modified water-stabilized crushed stone lower base course 17.

[0025] A geogrid 16 is provided between the lower base course 17 of the widened rubber powder modified water-stabilized crushed stone and the upper base course 10 of the widened water-stabilized crushed stone, with the inner end of the geogrid 16 extending to the widening platform.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0027] In the description of this utility model, the terms "inner", "outer", "longitudinal", "transverse", "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not require that this utility model must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A durable, rutting-resistant asphalt pavement widening structure, comprising a widened pavement located beside an existing road surface, characterized in that: The widened pavement includes, from bottom to top, a widened subgrade layer (15), a widened rubber powder modified water-stabilized crushed stone lower base course (17), a widened water-stabilized crushed stone upper base course (10), a cement concrete surface layer (4), a lower layer (3), an anti-rutting interlayer (2), and an upper layer (1). The anti-rutting interlayer (2) is a high-modulus asphalt concrete layer. The upper part of the cement concrete surface layer (4) is continuously reinforced. The cement concrete surface layer (4), the lower layer (3), the anti-rutting interlayer (2), and the upper layer (1) all extend above the old road crushed stone upper base course (12). The old road crushed stone upper base course (12) and the old road crushed stone lower base course (13) are provided with a widening platform at the widening point. The inner end of the widened water-stabilized crushed stone upper base course (10) extends to the widening platform.

2. The durable rutting-resistant asphalt pavement widening structure according to claim 1, characterized in that: The widened water-stabilized crushed stone upper base course (10) is flush with the old road crushed stone upper base course (12), the widened rubber powder modified water-stabilized crushed stone lower base course (17) is flush with the old road crushed stone lower base course (13), and the widened roadbed course (15) is flush with the old roadbed course (14).

3. The durable rutting-resistant asphalt pavement widening structure according to claim 1, characterized in that: Polyester fiber cloth (8) is provided above the joint between the splicing of the wide water-stabilized crushed stone upper base (10) and the old road crushed stone upper base (12).

4. The durable rutting-resistant asphalt pavement widening structure according to claim 1, characterized in that: A bonding layer (18) is provided between adjacent layers of cement concrete surface layer (4), lower layer (3), anti-rutting interlayer (2) and upper layer (1). The bonding layer (18) is an emulsified asphalt bonding layer or a modified asphalt bonding layer. The upper layer (1) is an SBS modified asphalt mastic aggregate mixture layer, and the lower layer (3) is a recycled SBS modified asphalt concrete layer.

5. The durable rutting-resistant asphalt pavement widening structure according to claim 4, characterized in that: The continuous reinforcement includes multiple transverse steel bars (5), with longitudinal steel bars (6) fixed at the bottom of the transverse steel bars (5), and multiple support bars (7) provided below the longitudinal steel bars (6). The top of the support bars (7) is fixed at the intersection of the transverse steel bars (5) and the longitudinal steel bars (6).

6. The durable rutting-resistant asphalt pavement widening structure according to claim 5, characterized in that: The top of the support bar (7) is fixed with a support member (9), and the top of the support member (9) is provided with a longitudinal support groove (11) that cooperates with the longitudinal steel bar (6). The top sides of the longitudinal support groove (11) are provided with transverse support grooves (19) that cooperate with the transverse steel bar (5).

7. The durable rutting-resistant asphalt pavement widening structure according to claim 3, characterized in that: A limiting pin (20) is inserted into the polyester fiber cloth (8). The top of the limiting pin (20) is provided with a limiting plate, and the outer side wall of the limiting pin (20) is provided with an anti-disengagement hook (21).

8. The durable rutting-resistant asphalt pavement widening structure according to claim 1, characterized in that: Cement slurry was applied to the side wall at the joint between the widened water-stabilized crushed stone upper base (10) and the old road crushed stone upper base (12), and to the side wall at the joint between the widened rubber powder modified water-stabilized crushed stone lower base (17) and the old road crushed stone lower base (13).

9. The durable rutting-resistant asphalt pavement widening structure according to claim 1, characterized in that: A geogrid (16) is provided between the lower base course (17) of the widened rubber powder modified water-stabilized crushed stone and the upper base course (10) of the widened water-stabilized crushed stone, with the inner end of the geogrid (16) extending to the widened platform.

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