A highway hardening road reconstruction structure

Abstract

The utility model belongs to the technical field of highway engineering maintenance, disclose a kind of highway hardening road reconstruction structure, the structure from bottom to top includes old road processing layer, reinforced drainage base layer, filter drainage layer, stress absorption layer and newly built surface layer.Reinforced drainage base layer is the porous concrete layer of built-in two-way geogrid;The transverse water collector in filter drainage layer is communicated with shoulder longitudinal drainage blind pipe;Longitudinal drainage blind pipe is laid in sand filter layer of ecological water storage purification pond, and drains to its lower pebble layer.The pool body is made of pebble layer, sand filter layer and planting soil, and curb is provided on the pool top, which is higher than the road surface, and solar warning column is installed on the shoulder.The utility model has simple and reasonable structure, solves the problem of reflection crack and water damage in old road reconstruction by cooperative drainage and rigid-flexible anti-cracking system, and realizes ecological cycle of water resources and self-powered warning, significantly improves road life and comprehensive benefit.

Description

Technical Field

[0001] This utility model belongs to the field of highway engineering maintenance technology, specifically relating to a highway hardening road reconstruction structure. Background Technology

[0002] Driven by the "Rural Revitalization" strategy, the demand for the construction and renovation of rural roads is increasing. For economic and environmental reasons, old roads are usually not completely demolished and rebuilt. Instead, a renovation and reinforcement technique is adopted, which involves directly laying a new surface layer on the existing road surface, commonly known as "white-to-black" or old road reinforcement.

[0003] A common existing method of road reconstruction involves breaking up or milling the old road surface and using it as the base or subbase layer of the new structure. While this method utilizes old materials, its structural design still has significant shortcomings. For example, patent CN223189524U discloses a road hardening reconstruction structure that uses the broken old road surface as a base, lays a 1-2 cm thick cement-sand stabilization layer on top, and finally pours a new concrete surface layer. Although this structure achieves preliminary utilization of old materials, it has the following inherent defects: First, it lacks an effective internal drainage system, and infiltrated water cannot be discharged, easily causing water damage such as softening of the base layer and pumping; second, there is no crack-resistant buffer between the old and new layers, and cracks in the old road surface can easily reflect to the new surface layer; finally, its function is limited, failing to effectively utilize the discharged water resources. Utility Model Content

[0004] To overcome the above-mentioned technical problems, this utility model provides a road hardening reconstruction structure.

[0005] The present invention adopts the following technical solution: A road hardening reconstruction structure includes, from bottom to top, an old road treatment layer, a drainage bearing layer, a filter drainage layer, a stress absorption layer, and a new surface layer, which are stacked sequentially. A transverse water collection pipe is embedded in the filter drainage layer. The outlet end of the transverse water collection pipe is connected to a longitudinal drainage blind pipe at the road shoulder. The outlet end of the longitudinal drainage blind pipe is connected to an ecological water storage and purification pond.

[0006] Preferably, the drainage bearing layer is a porous concrete layer with bidirectional geogrids laid throughout its entire cross-section.

[0007] Preferably, the filter drainage layer is composed of a graded crushed stone cushion layer and a geotextile filter layer from bottom to top; the transverse water collection pipe is buried in the graded crushed stone cushion layer.

[0008] Preferably, the stress-absorbing layer is a rubber asphalt layer, which is laid on top of the geotextile filter layer.

[0009] Preferably, the ecological water storage and purification pond consists of a pebble layer, a sand filter layer, and a planting soil layer from bottom to top; the longitudinal drainage blind pipe is laid in the sand filter layer and drains water to the pebble layer below through the permeable holes on its pipe wall.

[0010] Preferably, the ecological water storage and purification pond is fixedly connected to a curb stone on the side closest to the road; the top surface of the curb stone is higher than the top surface of the newly built surface layer; the top surface of the planting soil layer is lower than the top surface of the curb stone.

[0011] Preferably, multiple solar-powered warning posts are spaced apart at the road shoulder.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model improves the drainage efficiency of the structure and reduces the risk of water damage. By setting a reinforced drainage base layer that combines load-bearing and drainage functions, and combining it with a graded crushed stone drainage interlayer, an effective drainage channel is provided for water that has seeped into the pavement structure. This helps to remove stagnant water in the structural layer in a timely manner, thereby reducing the risk of water damage such as base layer softening and pumping caused by water immersion.

[0013] 2. This invention enhances the resistance to reflective cracking. By setting a stress-absorbing layer between the reinforced drainage layer and the newly constructed surface layer, a load-bearing and crack-resistant system that combines rigidity and flexibility is formed, effectively dispersing the load and absorbing stress, thus extending the pavement's lifespan.

[0014] 3. This utility model achieves auxiliary utilization of water resources. By combining drainage and irrigation, it saves water resources, reduces green space maintenance costs, and enhances the ecological value of roads. 4. This utility model improves safety and economy. The solar-powered warning posts achieve self-sufficient road safety warnings, resulting in low cost and convenient maintenance.

[0015] 5. This utility model improves the overall structural integrity and adaptability. The raised curb and sunken planting soil design not only prevents soil from polluting the road surface but also ensures the water storage function of the ecological pond, making it suitable for the renovation and construction of rural roads. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall design of this utility model; Figure 2 This is a top view of the present invention; Figure 3 yes Figure 2 Sectional view at point AA; Figure 4 yes Figure 3 Enlarged view of part A in the middle; Figure 5 yes Figure 2 Sectional view at point BB.

[0017] Explanation of reference numerals in the attached figures: 1. Existing road treatment layer; 2. Drainage bearing layer; 21. Bidirectional geogrid; 3. Filter drainage layer; 31. Geotextile filter layer; 32. Graded crushed stone cushion layer; 33. Transverse water collection pipe; 4. Stress absorption layer; 5. New surface layer; 6. Curbstone; 7. Solar warning post; 71. Solar panel; 8. Ecological terminal system; 81. Longitudinal drainage blind pipe; 82. Ecological water storage and purification pond; 821. Pebble layer; 822. Sand filter layer; 823. Planting soil layer. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings. Throughout the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. Unless otherwise specified, the raw materials and equipment used are commercially available or commonly used in the art. The methods in the embodiments, unless otherwise specified, are conventional methods in the art. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] A road hardening reconstruction structure includes, from bottom to top, an old road treatment layer 1, a drainage bearing layer 2, a filter drainage layer 3, a stress absorption layer 4, and a new surface layer 5, which are stacked sequentially.

[0020] First, the existing old cement concrete pavement is broken up. A multi-head crusher is used to break the old pavement slab into blocks with a particle size of 20-40cm, and then a heavy roller is used to compact and stabilize them, forming a solid and flat old pavement treatment layer 1. This layer serves as the foundation of the structure of this utility model.

[0021] Subsequently, the drainage bearing layer 2 is constructed on the compacted and stabilized old road treatment layer 1. First, a layer of bidirectional geogrid 21 is laid on the old road layer. In this embodiment, a polypropylene bidirectional geogrid 21 with a tensile strength of not less than 30KN / m is selected, and the overlap width of the geogrid is not less than 15cm. Then, porous cement concrete is poured on site. The pouring thickness is 180mm. During the concrete pouring process, it is ensured that the geogrid network is filled, and it is compacted with a plate vibrator before initial setting. Finally, the bidirectional geogrid 21 is fully encased in porous concrete, forming an integral slab structure with both high load-bearing capacity and vertical drainage function.

[0022] After the drainage bearing layer 2 has reached a certain strength, the filter drainage layer 3 is constructed. This layer adopts a composite structure and is constructed from bottom to top. First, a layer of graded crushed stone is laid on the drainage bearing layer 2. In this embodiment, continuous graded crushed stone with a particle size of 5-20mm is selected, and it is manually spread and leveled. While laying the crushed stone, PVC perforated blind pipes are buried at a longitudinal spacing of 10 meters as transverse water collection pipes 33. This pipe must maintain a drainage slope of not less than 2%, with its inlet end located on the inside of the road and its outlet end extending to the road shoulder. Finally, a layer of permeable short-fiber geotextile is fully laid on the top surface of the graded crushed stone cushion layer 32 as a geotextile filter layer 31 to prevent the upper construction materials from clogging the lower drainage structure.

[0023] A stress-absorbing layer 4 is constructed on top of the geotextile filter layer 31. In this embodiment, a rubber asphalt layer is used. Rubber powder is added to asphalt and heated to a suitable temperature of 180℃-200℃, mixed for 1 hour, and then sprayed.

[0024] After the stress-absorbing layer cools and solidifies, a new surface layer 5 is laid on top of it. In this embodiment, medium-grained asphalt concrete is used, which is paved with a paver and compacted by a combination of double steel drum and rubber-tired rollers according to specifications.

[0025] An ecological terminal system 8 is constructed simultaneously outside the road shoulders on both sides. First, a foundation trench is excavated adjacent to the road shoulder to construct an ecological water storage and purification pond 82. Its structure, from bottom to top, consists of a pebble layer 821, a sand filter layer 822, and a planting soil layer 823. The pebble layer 821 is filled with clean pebbles with a particle size of 30-50mm; the sand filter layer 822 is filled with medium-coarse sand; and the planting soil layer 823 is filled with planting soil suitable for local plant growth and planted with flood-tolerant and drought-tolerant native herbaceous plants. Along the longitudinal direction of the road, a permeable plastic longitudinal drainage blind pipe 81 is buried at the junction of the road shoulder and the ecological water storage and purification pond 82. The outlet ends of all transverse water inlets are connected to this pipe. The longitudinal drainage blind pipe 81 is laid within the sand filter layer 822, and through permeable holes in its pipe wall, the collected rainwater is discharged into the pebble layer 821 below.

[0026] On the side of the ecological water storage and purification pond 82 closest to the road, a precast concrete curbstone 6 is installed. Its top surface is 100mm higher than the top surface of the newly constructed surface layer 5, forming an effective protective and visual boundary; while the top surface of the planting soil layer 823 is 50mm lower than the top surface of the curbstone 6, effectively preventing soil overflow onto the road. On the road shoulder outside the ecological water storage and purification pond 82, a commercially available solar-powered warning post 7 is fixedly installed every 20 meters via a pre-embedded base. The top of this warning post integrates a solar panel 71, and the side of the post is equipped with LED warning lights for nighttime outline marking and safety warnings.

[0027] The working principle is as follows: Rainwater infiltrates through the tiny pores or cracks in the newly constructed surface layer 5, is blocked by the stress-absorbing layer 4, and is directed to both sides. Some water passes through the geotextile filter layer 31 and enters the graded crushed stone cushion layer 32, where it is collected horizontally and flows into the transverse water collection pipe 33. At the same time, another part of the water infiltrates directly into the reinforced drainage base layer and is discharged vertically through its porous structure. All the water flowing into the transverse water collection pipe 33 flows into the longitudinal drainage blind pipe 81 according to the slope, and is finally discharged into the ecological water storage and purification pond 82. After being naturally filtered and purified in the pond, the water infiltrates the planting soil layer 823 for plant growth. The solar-powered warning post 7 provides self-sufficient safety lighting for the road.

[0028] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to the above embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A road hardening reconstruction structure, comprising, from bottom to top, a pre-existing road treatment layer, a drainage bearing layer, a filter drainage layer, a stress-absorbing layer, and a new surface layer, characterized in that, A transverse water collection pipe is embedded in the filter drainage layer; the outlet end of the transverse water collection pipe is connected to a longitudinal drainage blind pipe at the road shoulder; the outlet end of the longitudinal drainage blind pipe is connected to an ecological water storage and purification pond.

2. The road hardening reconstruction structure according to claim 1, characterized in that, The drainage bearing layer is a porous concrete layer with bidirectional geogrids laid throughout its entire cross-section.

3. The road hardening reconstruction structure according to claim 1, characterized in that, The filter drainage layer consists of a graded crushed stone cushion layer and a geotextile filter layer from bottom to top; the transverse water collection pipe is buried in the graded crushed stone cushion layer.

4. The road hardening reconstruction structure according to claim 3, characterized in that, The stress-absorbing layer is a rubber asphalt layer, which is laid on top of the geotextile filter layer.

5. The road hardening reconstruction structure according to claim 1, characterized in that, The ecological water storage and purification pond consists of a pebble layer, a sand filter layer, and a planting soil layer from bottom to top; the longitudinal drainage blind pipe is laid in the sand filter layer and drains water to the pebble layer below through the water-permeable holes on its pipe wall.

6. The road hardening reconstruction structure according to claim 5, characterized in that, The ecological water storage and purification pond is fixedly connected to a curbstone on the side closest to the road; the top surface of the curbstone is higher than the top surface of the newly built surface layer; the top surface of the planting soil layer is lower than the top surface of the curbstone.

7. The road hardening reconstruction structure according to claim 1, characterized in that, Multiple solar-powered warning posts are spaced apart along the road shoulder.

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