Pavement structure suitable for uneven settlement disease of bituminous pavement of soft foundation road section

Abstract

The utility model relates to the technical field of road engineering structures, in particular to a pavement structure suitable for uneven settlement of a bituminous pavement of a soft foundation road section, which comprises a plurality of precast concrete piles inserted into an uneven settlement roadbed, and a cushion concrete plate is assembled at the tops of the precast concrete piles. A thickened bearing concrete plate is laid on the tops of every two adjacent cushioning concrete plates, a gravel bedding layer is arranged on the upper half portion of the prefabricated concrete pile, a gravel mattress upper layer is arranged above the thickened bearing concrete plates, an elastic buffering layer is laid above the gravel mattress upper layer, and a stress dissipation layer is laid on the upper surface of the elastic buffering layer. An asphalt surface layer is arranged on the surface of the stress dissipation layer, a bonding layer is arranged between the elastic buffer layer and the stress dissipation layer, and a plurality of anchor rods are arranged in the precast concrete pile. The structure is firm and stable, differential settlement development of the foundation can be restrained, and the influence of settlement of the soft foundation road section on the pavement is effectively relieved.

Description

Technical Field

[0001] This utility model relates to the field of road engineering structure technology, and more specifically, to a pavement structure applicable to uneven settlement of asphalt pavement in soft soil sections. Background Technology

[0002] In road construction, the treatment of soft soil foundations has always been a challenging engineering task. Soft soil foundations are characterized by high water content, high compressibility, low strength, and low permeability. Under the long-term effects of vehicle loads, natural environmental factors (such as rainfall and temperature changes), and time, they are highly susceptible to uneven settlement. Asphalt pavement, as a widely used pavement type in road engineering, is extremely sensitive to foundation deformation. Uneven settlement in soft soil sections can lead to defects such as cracks, potholes, and ruts in asphalt pavements. These defects not only affect the smoothness and driving comfort of the road, increasing vehicle rolling resistance and tire wear, but also reduce the road's load-bearing capacity, and in severe cases, even threaten driving safety.

[0003] Utility model patent CN216999144U discloses a pavement structure suitable for uneven settlement of asphalt pavement in soft soil sections. The structure includes a precast panel layer laid within an excavated trench corresponding to the uneven settlement. An auxiliary layer for enhanced waterproofing and interlayer bonding is provided between the precast panel layer and the trench. A surface layer is laid on top of the precast panel layer. This utility model allows for reasonable excavation of trenches within the area of ​​uneven settlement in soft soil sections, minimizing the construction area. It eliminates the need for pre-reinforcement of the subgrade using jet grouting piles, resulting in rapid construction and significantly shortened construction time. The auxiliary layer between the precast panel layer and the trench enhances waterproofing and interlayer bonding. The pavement structure of this utility model has high load-bearing capacity, good integrity, and strong resistance to deformation. The bonding between the layers and between the pavement structure and the subgrade is firm and reliable, making it resistant to damage.

[0004] Although this technical solution has advantages such as high load-bearing capacity, good integrity, and strong resistance to deformation, most traditional methods for addressing uneven settlement of asphalt pavement in soft soil sections still rely on foundation reinforcement and pavement structure optimization. Foundation reinforcement methods, such as replacement, drainage consolidation, and dynamic compaction, can improve the load-bearing capacity of the foundation to some extent, but they are complex to construct, time-consuming, costly, and cannot completely eliminate uneven foundation settlement. Regarding pavement structure optimization, methods typically involve increasing the thickness of the pavement structure layers or improving the strength of the pavement materials. However, simply increasing the thickness increases the additional stress on the foundation, exacerbating foundation settlement, while increasing material strength cannot fundamentally solve the impact of foundation deformation on the pavement. Therefore, there is an urgent need to develop a new pavement structure that can effectively adapt to deformation in soft soil sections and enhance the integrity and durability of the pavement structure. Utility Model Content

[0005] The purpose of this invention is to provide a pavement structure suitable for uneven settlement of asphalt pavement in soft soil sections, so as to solve the defects mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A pavement structure suitable for uneven settlement of asphalt pavement in soft soil sections includes multiple precast concrete piles inserted into the unevenly settled subgrade. The top of each precast concrete pile is fitted with a concrete slab, and a thickened load-bearing concrete slab is laid on top of two adjacent concrete slabs. A crushed stone paving layer is provided on the upper half of each precast concrete pile. A crushed stone mattress layer is provided above the thickened load-bearing concrete slab. An elastic buffer layer is laid above the crushed stone mattress layer. A stress dissipation layer is laid on the upper surface of the elastic buffer layer. An asphalt surface layer is provided on the surface of the stress dissipation layer.

[0008] Preferably, the precast concrete piles adopt a composite reinforced pile network structure arranged in a quincunx pattern, and the two ends of the thickened load-bearing concrete slab respectively abut against the upper surfaces of two adjacent pad concrete slabs;

[0009] This feature allows the weight of the thickened load-bearing concrete slab to be distributed to the two adjacent supporting concrete slabs.

[0010] Preferably, an adhesive layer is provided between the elastic buffer layer and the stress dissipation layer, the adhesive layer being used to enhance the adhesion between the structural layers.

[0011] Preferably, a bidirectional geogrid is laid in the upper layer of the crushed stone mattress, and the bidirectional geogrid has a mesh structure.

[0012] The bidirectional geogrid installed in this system has high tensile strength and modulus, which can enhance the integrity of the foundation surface, disperse the load transmitted by the upper pavement structure, and effectively suppress the development of uneven settlement of the foundation.

[0013] Preferably, the precast concrete pile is provided with multiple anchor rods, which are arranged along the height direction of the precast concrete pile.

[0014] Preferably, the top of the anchor rod extends from the top of the precast concrete pile, a first through hole is provided at a corresponding position in the pad concrete slab, a second through hole is provided at a corresponding position in the thickened bearing concrete slab, and the top of the anchor rod passes through the corresponding first through hole and second through hole.

[0015] Preferably, both the foundation concrete slab and the thickened load-bearing concrete slab are provided with multiple transverse reinforcing bars and multiple longitudinal reinforcing bars, which are arranged alternately.

[0016] Preferably, the transverse reinforcing bars are arranged in the width direction, and the longitudinal reinforcing bars are arranged along the length direction.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This utility model, by setting precast concrete piles inserted into the unevenly settled subgrade and using a composite reinforced pile network structure arranged in a quincunx pattern, combined with a concrete slab on the pile top, a thickened load-bearing concrete slab, and a crushed stone paving layer on the upper half of the pile, effectively disperses and transfers the road load to the depth of the foundation, while improving the overall bearing capacity of the foundation; the bidirectional geogrid laid in the upper layer of the crushed stone paving further enhances the integrity of the foundation surface, inhibits the development of uneven foundation settlement, and effectively mitigates the impact of settlement on the road surface in soft soil sections.

[0019] 2. This utility model, by sequentially setting an elastic buffer layer, a stress dissipation layer, and an asphalt surface layer on top of a thickened load-bearing concrete slab, and in conjunction with an interlayer bonding layer, allows the elastic buffer layer to absorb energy through its own compression deformation when the foundation settles, thus playing a buffering and shock-absorbing role; the stress dissipation layer absorbs and dissipates the stress concentration generated in the pavement structure due to foundation deformation, preventing stress from being transmitted to the asphalt surface layer. The asphalt surface layer is made of appropriate materials, and the combined effect of each layer significantly enhances the deformation resistance of the pavement structure and reduces the occurrence of defects such as cracks and potholes.

[0020] 3. This utility model enhances the connection strength and overall stability between components by setting anchor rods inside precast concrete piles and having their tops pass through a concrete slab and a thickened load-bearing concrete slab in sequence, in conjunction with the staggered transverse and longitudinal steel bars inside the slabs. This structural design not only improves the load-bearing capacity of the pavement structure but also ensures a firm and reliable bond between structural layers and between the pavement structure and the subgrade, reducing the risk of pavement damage and extending the service life of the pavement. At the same time, compared with traditional treatment methods, it effectively reduces engineering costs and subsequent maintenance expenses. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is one of the partial structural schematic diagrams of this utility model;

[0023] Figure 3 This is the second partial structural schematic diagram of the present utility model;

[0024] Figure 4This is a cross-sectional view of the thickened load-bearing concrete slab and the thickened load-bearing concrete slab of this utility model;

[0025] The meanings of the labels in the diagram are as follows:

[0026] 1. Precast concrete pile; 10. Anchor bolt; 11. Concrete slab; 111. First through hole; 12. Thickened load-bearing concrete slab; 121. Second through hole; 13. Transverse reinforcement; 14. Longitudinal reinforcement; 15. Crushed stone bedding layer;

[0027] 2. Crushed stone mattress upper layer; 20. Bidirectional geogrid;

[0028] 3. Elastic buffer layer; 30. Adhesive layer; 31. Stress dissipation layer; 32. Asphalt surface layer. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0030] Please see Figures 1-4 This utility model provides a technical solution: a pavement structure suitable for uneven settlement of asphalt pavement in soft soil sections, including multiple precast concrete piles 1 inserted into the unevenly settled subgrade. The precast concrete piles 1 adopt a composite reinforced pile network structure and are arranged in a quincunx pattern, which can effectively improve the vertical bearing capacity of the soft soil foundation and limit the foundation settlement. The top of the precast concrete piles 1 is equipped with a pad concrete slab 11, and the top of two adjacent pad concrete slabs 11 is covered with a thickened bearing concrete slab 12, so that the gravity on the thickened bearing concrete slab 12 is distributed to the adjacent pad concrete slabs 11, and then evenly distributed to the foundation, effectively inhibiting the development of uneven foundation settlement.

[0031] like Figure 1As shown, the upper part of the precast concrete pile 1 is provided with a crushed stone paving layer 15, and a crushed stone mattress upper layer 2 is provided above the thickened bearing concrete slab 12. An elastic buffer layer 3 is laid on the upper layer 2, and a stress dissipation layer 31 is laid on the upper surface of the elastic buffer layer 3. An asphalt surface layer 32 is provided on the surface of the stress dissipation layer 31. An adhesive layer 30 is provided between the elastic buffer layer 3 and the stress dissipation layer 31. The adhesive layer 30 is used to enhance the bonding force between the structural layers. A bidirectional geogrid 20 is laid in the upper layer 2 of the crushed stone mattress. The bidirectional geogrid 20 has a mesh structure. The bidirectional geogrid 20 laid in the upper layer 2 of the crushed stone mattress enhances the integrity of the foundation surface. The elastic buffer layer 3 absorbs the deformation energy of the foundation, the stress dissipation layer 31 dissipates stress, and the asphalt surface layer 32 adapts to deformation. The multi-layer structure works together to significantly improve the road surface's ability to resist uneven settlement.

[0032] Specifically, the elastic buffer layer 3 can be composed of foamed concrete and rubber particles. Foamed concrete is lightweight and porous, which can reduce the self-weight of the pavement structure and reduce the additional stress on the foundation. The addition of rubber particles gives the layer good elasticity and toughness. When uneven settlement occurs in the soft foundation, the elastic buffer layer can absorb the energy generated by the deformation of the foundation through its own compression and deformation, alleviate the impact of uneven settlement on the upper pavement structure, and play a role in buffering and shock absorption.

[0033] Furthermore, the stress dissipation layer 31 can be paved with high-damping asphalt mixture. The high-damping asphalt mixture has added damping modifiers, giving it high damping characteristics and fatigue resistance. When uneven settlement occurs in soft soil sections, the stress dissipation layer can effectively absorb and dissipate the stress concentration generated in the pavement structure due to foundation deformation, preventing stress from being transmitted upward to the asphalt surface layer, thereby reducing the generation of cracks in the asphalt surface layer.

[0034] In addition, the asphalt surface layer 32 can be made of high-viscosity and high-elasticity modified asphalt SMA mixture. This mixture has excellent high-temperature stability, low-temperature crack resistance and anti-skid performance. Its dense structure enables the asphalt surface layer 32 to better adapt to the deformation of the underlying structural layer while having good mechanical properties, thus reducing pavement damage caused by uneven settlement.

[0035] like Figure 2 and Figure 3 As shown, the two ends of the thickened load-bearing concrete slab 12 abut against the upper surfaces of two adjacent pad concrete slabs 11, which can distribute the weight of the thickened load-bearing concrete slab 12 to the two adjacent pad concrete slabs 11, and then evenly distribute it to the foundation, effectively suppressing the development of uneven settlement of the foundation.

[0036] like Figure 3As shown, a plurality of anchor rods 10 are installed inside the precast concrete pile 1. The anchor rods 10 are installed along the height direction of the precast concrete pile 1. The installation of the anchor rods 10 can enhance the strength of the precast concrete pile 1 and make the precast concrete pile 1 less prone to cracking.

[0037] like Figure 3 As shown, the top end of the anchor rod 10 extends from the top of the precast concrete pile 1. A first through hole 111 is provided at the corresponding position in the pad concrete slab 11, and a second through hole 121 is provided at the corresponding position in the thickened bearing concrete slab 12. The top end of the anchor rod 10 passes through the corresponding first through hole 111 and second through hole 121. The top end of the anchor rod 10 can be fixed with a nut, so that the thickened bearing concrete slab 12 and the pad concrete slab 11 are sequentially fixed on the top of the precast concrete pile 1.

[0038] like Figure 4 As shown, both the concrete slab 11 and the thickened load-bearing concrete slab 12 are equipped with multiple transverse steel bars 13 and multiple longitudinal steel bars 14. The transverse steel bars 13 and longitudinal steel bars 14 are arranged alternately, with the transverse steel bars 13 positioned in the width direction and the longitudinal steel bars 14 positioned along the length direction. This ensures that the anchor rods 10, the steel bars, and the concrete slab are tightly connected, enhancing the connection strength and overall stability between the components. This ensures that the pavement structure remains firm during soft soil settlement, extends the service life of the pavement, and reduces maintenance costs.

[0039] In this embodiment, the crushed stone paving layer 15 and the upper layer of crushed stone mattress 2 can adjust the stress sharing ratio of pile and soil, making the foundation more uniformly stressed; the bidirectional geogrid 20 has high tensile strength and modulus, which can enhance the integrity of the foundation surface, disperse the load transmitted by the upper pavement structure, and effectively suppress the development of uneven settlement of the foundation.

[0040] It is worth noting that the bonding layer 30 can be made by spraying fast-setting high-viscosity asphalt material, which can enhance the bonding force between the structural layers, make the pavement structure form a whole, and improve the collaborative working ability of the pavement structure. At the same time, a layer of glass fiber grid can be laid between the asphalt surface layer 32 and the stress dissipation layer 31. The glass fiber grid has the characteristics of high strength and low elongation, which can further enhance the tensile strength and fatigue resistance of the asphalt surface layer 32 and effectively inhibit the propagation of cracks.

[0041] When using the pavement structure of this utility model applicable to uneven settlement of asphalt pavement in soft soil sections, firstly, according to the geological survey results, a crushed stone subbase 15 is laid in the uneven settlement roadbed area. Then, the position and parameters of the precast concrete pile 1 are determined, and the precast concrete pile 1 is inserted into the uneven settlement roadbed in a staggered pile pattern using a pile driver to ensure that the verticality and depth of the pile meet the standards. The anchor rod 10 inside the pile is installed in place simultaneously.

[0042] Next, install a concrete slab 11 on top of the precast concrete pile 1, pass the top of the anchor rod 10 through its first through hole 111, and then lay a thickened load-bearing concrete slab 12 so that the anchor rod 10 passes through the second through hole 121. Fix the top of the anchor rod 10 with a nut to complete the installation of the two layers of concrete slabs and achieve gravity distribution. Subsequently, lay a crushed stone mattress layer 2 on top of the thickened load-bearing concrete slab 12, and lay a bidirectional geogrid 20 in it to enhance the integrity of the foundation.

[0043] Afterwards, an elastic buffer layer 3 is poured on the upper layer 2 of the crushed stone mattress. After it is cured and formed, an adhesive layer 30 is sprayed on, then a stress dissipation layer 31 is laid, and finally an asphalt surface layer 32 is laid on the surface of the stress dissipation layer 31.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pavement structure suitable for uneven settlement of asphalt pavement in soft soil sections, comprising multiple precast concrete piles (1) inserted into the unevenly settled subgrade, characterized in that: The top of the precast concrete pile (1) is fitted with a concrete pad (11), and the top of two adjacent concrete pads (11) is covered with a thickened load-bearing concrete slab (12). The upper half of the precast concrete pile (1) is provided with a crushed stone pad layer (15). A crushed stone mattress upper layer (2) is provided above the thickened load-bearing concrete slab (12). An elastic buffer layer (3) is provided above the crushed stone mattress upper layer (2). A stress dissipation layer (31) is provided on the upper surface of the elastic buffer layer (3). An asphalt surface layer (32) is provided on the surface of the stress dissipation layer (31).

2. The pavement structure applicable to uneven settlement distress of asphalt pavement in soft soil sections according to claim 1, characterized in that: The precast concrete pile (1) adopts a composite reinforced pile network structure arranged in a plum blossom shape, and the two ends of the thickened bearing concrete slab (12) respectively abut against the upper surface of the two adjacent pad concrete slabs (11).

3. The pavement structure applicable to uneven settlement distress of asphalt pavement in soft soil sections according to claim 1, characterized in that: An adhesive layer (30) is provided between the elastic buffer layer (3) and the stress dissipation layer (31), and the adhesive layer (30) is used to enhance the adhesion between the structural layers.

4. The pavement structure applicable to uneven settlement distress of asphalt pavement in soft soil sections according to claim 1, characterized in that: The upper layer (2) of the crushed stone mattress is covered with a bidirectional geogrid (20), which has a mesh structure.

5. The pavement structure applicable to uneven settlement distress of asphalt pavement in soft soil sections according to claim 1, characterized in that: The precast concrete pile (1) is provided with a plurality of anchor rods (10), which are arranged along the height direction of the precast concrete pile (1).

6. The pavement structure applicable to uneven settlement distress of asphalt pavement in soft soil sections according to claim 5, characterized in that: The top of the anchor rod (10) extends from the top of the precast concrete pile (1), and a first through hole (111) is provided at the corresponding position in the pad concrete slab (11), and a second through hole (121) is provided at the corresponding position in the thickened bearing concrete slab (12). The top of the anchor rod (10) passes through the corresponding first through hole (111) and second through hole (121).

7. The pavement structure applicable to uneven settlement distress of asphalt pavement in soft soil sections according to claim 6, characterized in that: The interior of both the foundation concrete slab (11) and the thickened load-bearing concrete slab (12) is provided with multiple transverse steel bars (13) and multiple longitudinal steel bars (14), which are arranged in an alternating pattern.

8. The pavement structure applicable to uneven settlement distress of asphalt pavement in soft soil sections according to claim 7, characterized in that: The transverse reinforcement (13) is arranged in the width direction, and the longitudinal reinforcement (14) is arranged along the length direction.

Images