Expressway reconstruction and extension asphalt pavement widening structure
By using technical means such as expanding concrete layers and porous concrete drainage layers in the reconstruction and expansion of highways, the problems of untight connections, cracking and poor drainage at the splicing of new and old pavements have been solved, and high-quality splicing and extending the service life of the pavement are achieved.
Patent Information
- Application Number
- CN202510243978.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2025-04-25
AI Technical Summary
During the renovation and expansion of the expressway, the splicing of new and old pavements is not dense, and cracks and poor drainage are prone to occur, which affects the service life of the pavement.
A wide-spread structure for the asphalt pavement is adopted for highway reconstruction and expansion, including an expanded concrete layer, a porous concrete drainage layer, a new asphalt surface layer and a new base structure. The expansion concrete layer fills the base layer voids, and the porous concrete drainage layer improves drainage performance and ensures that the new and old pavement are densely connected.
It improves the quality of splicing, prevents cracks and diseases, effectively solves the problems of untight connections, cracks and poor drainage at the splicings of new and old pavements, and extends the service life of the pavement.
Smart Images
Figure CN119877349A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of highway reconstruction and expansion, and in particular to an asphalt pavement widening structure for highway reconstruction and expansion. Background Art
[0002] With the continuous growth of traffic volume, the service level of highways is getting lower and lower, and there is an urgent need to renovate and expand the original highways. In the reconstruction and expansion of highways, it is inevitable to involve the widening of the new and old pavements. For example, poor treatment can easily cause cracking, subsidence and poor drainage. Most of my country's highways use asphalt pavement structure. The old pavement structure has many forms, complex structural combination distribution, large thickness variation, long construction time, and obvious performance decay. After milling and excavation, it is found that the base and cushion layer are relatively loose, and most of them cannot form a solid splicing surface. The splicing quality and structural strength of the splicing cannot be guaranteed. After excavation, it is also found that the loose base or cushion layer is in a wet state, and there is obvious water seepage in some parts, which seriously affects the service life of the pavement. If the conventional step widening method is used, it is difficult to ensure the quality of the excavated steps, the joints are difficult to compact, the connection between the new and old pavements is not dense, and the water in the old pavement structure layer cannot be quickly discharged from the pavement structure, which will cause cracks and other diseases in the pavement. Summary of the invention
[0003] In order to solve the drainage technical problem of the above-mentioned multi-lane ultra-wide highway, the present invention provides a highway reconstruction and expansion asphalt pavement widening structure. The following technical solutions are adopted:
[0004] A structure for widening an asphalt pavement for reconstruction and expansion of a highway, wherein the old pavement structure comprises an old asphalt surface layer, an old cement-stabilized crushed stone upper base layer, an old cement-stabilized crushed stone lower base layer and an old cement-stabilized crushed stone subbase layer, wherein the old cement-stabilized crushed stone lower base layer is laid on the upper surface of the old cement-stabilized crushed stone subbase layer, the old cement-stabilized crushed stone upper base layer is laid on the upper surface of the old cement-stabilized crushed stone lower base layer, and the old asphalt surface layer is laid on the upper surface of the old cement-stabilized crushed stone upper base layer; the structure for widening an asphalt pavement for reconstruction and expansion of a highway comprises an expansive concrete layer, a porous concrete drainage layer, a newly-built asphalt surface layer, a newly-built cement-stabilized crushed stone upper base layer, a newly-built cement-stabilized crushed stone lower base layer, a newly-built cement-stabilized crushed stone subbase layer and a newly-built graded crushed stone cushion layer structure, wherein the newly-built graded crushed stone cushion layer structure is laid on a newly-built roadbed, and the side surfaces of the porous concrete drainage layer are adjacent to the old cement-stabilized crushed stone lower base layer and the old cement-stabilized crushed stone subbase layer. The splicing side is connected, the bottom is connected to the top surface of the newly built graded gravel cushion structure, the newly built cement stabilized gravel subbase is laid on the upper surface of the newly built graded gravel cushion structure, the newly built cement stabilized gravel lower base is laid on the upper surface of the newly built cement stabilized gravel subbase, the sides of the newly built cement stabilized gravel lower base and the newly built cement stabilized gravel subbase are both connected to the porous concrete drainage layer, the side of the expansive concrete layer is connected to the old cement stabilized gravel upper base, the bottom is connected to the porous concrete drainage layer and the upper surface of the newly built cement stabilized gravel lower base, the bottom of the newly built cement stabilized gravel upper base is laid on the upper surface of the newly built cement stabilized gravel lower base, and the side is connected to the other side of the expansive concrete layer, the newly built asphalt surface layer is laid on the upper surfaces of the expansive concrete layer and the newly built cement stabilized gravel upper base, and the side is spliced with the old asphalt surface layer to form the widened highway pavement.
[0005] By adopting the above technical solution, the expansive concrete layer can fill and compact the gaps between the new and old pavement bases, reduce the shrinkage of the concrete, increase the connection between the new and old pavement bases, thereby improving the splicing quality and preventing cracks and defects.
[0006] After the internal water is collected from the porous concrete drainage layer, it seeps out from the newly built cement-stabilized gravel subbase, the newly built cement-stabilized gravel subbase, and the outside of the newly built graded gravel cushion structure, preventing moisture accumulation and affecting the service life of the road surface. The porous concrete drainage layer has good drainage performance and can effectively drain moisture from the pavement structure, prevent moisture accumulation, and reduce the occurrence of pavement diseases, thereby effectively solving problems such as loose connections, cracking, and poor drainage at the joints of the new and old pavements.
[0007] Optionally, the asphalt pavement widening structure for highway reconstruction and expansion further includes a polyester glass fiber cloth layer, and the polyester glass fiber cloth layer is overlapped between the old asphalt surface layer and the newly built asphalt surface layer.
[0008] Optionally, a butt cut is provided on one side of the old asphalt surface layer, and a lap block is provided on one side of the new asphalt surface layer. The lap block is laid on the butt cut, and the polyester glass fiber cloth layer is laid on the upper surface of the butt cut and extends into the bottom of the new asphalt surface layer by one to two meters.
[0009] By adopting the above technical solution, the polyester fiberglass cloth layer plays a key role as a splicing layer between the old asphalt surface layer and the newly built asphalt surface layer. The polyester fiberglass cloth has a high tensile strength and can effectively resist the tensile stress caused by temperature changes, vehicle loads and other factors on the asphalt surface layer, and prevent the generation and expansion of reflective cracks. The polyester fiberglass cloth has good flexibility and can adapt to the deformation of the asphalt surface layer to avoid cracks caused by excessive deformation. The polyester fiberglass cloth can enhance the interface bonding between the new and old pavements, prevent water infiltration, and reduce the occurrence of pavement diseases. The polyester fiberglass cloth has good shear resistance and can effectively resist the shear stress caused by vehicle loads on the asphalt surface layer, and prevent the occurrence of pavement diseases such as slippage and rutting. Preventing the generation and expansion of reflective cracks can effectively extend the service life of the pavement, enhance the bonding between the new and old pavements, and reduce the occurrence of pavement diseases, thereby extending the service life of the pavement. The polyester fiberglass cloth is easy to lay, convenient and quick to construct, and the polyester fiberglass cloth has stable quality and reliable performance.
[0010] Optionally, a trapezoidal groove structure is provided on the splicing sides of the old cement stabilized gravel upper base, the old cement stabilized gravel lower base and the old cement stabilized gravel bottom base, and a corresponding boss structure is provided on the splicing sides of the expansive concrete layer and the porous concrete drainage layer, and the boss structure is embedded in the trapezoidal groove structure.
[0011] By adopting the above technical solution and setting up a splicing method of a trapezoidal groove structure and a boss structure, the connection between the new and old pavements can be strengthened and the overall performance of the splicing structure can be improved. The boss structure is embedded in the trapezoidal groove structure to form a mechanical bite, which can significantly improve the connection strength between the new and old pavements and prevent the occurrence of delamination, displacement and other defects. The setting of the trapezoidal groove structure and the boss structure can increase the contact area between the new and old pavements, enhance the interface bonding, and improve the overall strength of the splicing structure. The boss structure is embedded in the trapezoidal groove structure, which can reduce the stress concentration between the new and old pavements and prevent the generation and expansion of reflective cracks. The setting of the trapezoidal groove structure and the boss structure can adapt to the deformation between the new and old pavements and avoid cracks caused by excessive deformation.
[0012] Optionally, it also includes a grid skeleton structure, which is laid on the joint surface of the newly built cement-stabilized crushed stone subbase and the newly built graded crushed stone cushion structure, and the bottom of the grid skeleton structure is connected to the newly built roadbed.
[0013] Optionally, the grid skeleton structure includes multiple pillars and a frame, the tops of the multiple pillars are welded to the bottom of the frame, the bottom is connected to the newly built roadbed, and the frame is laid on the joint surface of the newly built cement-stabilized crushed stone subbase and the newly built graded crushed stone cushion structure.
[0014] By adopting the above technical solutions, the grid keel structure can disperse the vehicle load to a larger area, reduce the stress concentration of the roadbed, and thus improve the stability of the roadbed. The grid keel structure can limit the lateral deformation of the roadbed, prevent the roadbed from settling, and ensure the flatness of the road surface. The grid keel structure can increase the drainage channel inside the roadbed, speed up the discharge of water, and prevent water accumulation from affecting the stability of the roadbed.
[0015] Optionally, the porous concrete drainage layer has a porosity of 15%-30%.
[0016] By adopting the above technical solution, the porosity of the porous concrete drainage layer ranges from 15% to 30%. When the porosity is lower than 15%, the drainage performance may be insufficient and it is difficult to effectively drain the moisture inside the pavement structure. When the porosity is higher than 30%, the strength and durability of the concrete may be affected, and it is prone to cracking and damage.
[0017] The components of porous concrete drainage layer include: cement, sand, gravel, admixtures and water;
[0018] The cement used is P.O42.5 ordinary Portland cement; the sand used is medium sand or coarse sand with a fineness modulus of 2.3-3.1; the gravel used is crushed stone with a particle size of 5-20mm; the admixtures used are fly ash, slag powder, etc.; the water needs to meet the requirements for concrete mixing water.
[0019] A construction process for a highway reconstruction and expansion asphalt pavement widening structure, using a highway reconstruction and expansion asphalt pavement widening structure to widen an old pavement structure, comprising the following steps:
[0020] Step 1: Use a milling machine to process the old road surface structure, so that the old asphalt surface layer reaches the designed elevation, set trapezoidal groove structures on the joint sides of the old cement-stabilized gravel upper base, the old cement-stabilized gravel lower base and the old cement-stabilized gravel bottom base, and open a butt cut on the old asphalt surface layer;
[0021] Step 2: fill and compact the new roadbed according to the design requirements;
[0022] Step 3: placing the grid skeleton structure on the newly built roadbed, laying a crushed stone cushion layer on the newly built roadbed and compacting it to form a newly built graded crushed stone cushion layer structure, laying crushed stone on the grid skeleton structure and compacting it to form a newly built cement-stabilized crushed stone subbase;
[0023] Step 4, laying a cement-stabilized crushed stone lower base on the cement-stabilized crushed stone base and compacting it;
[0024] Step 5, pouring an expansive concrete transition layer on the cement-stabilized gravel lower base, and vibrating and curing it to ensure that the side of the expansive concrete transition layer is connected to the old cement-stabilized gravel upper base, and the bottom is connected to the porous concrete drainage layer and the upper surface of the newly built cement-stabilized gravel lower base;
[0025] Step 6, pouring a porous concrete drainage layer between the joint side of the cement-stabilized crushed stone lower base and the cement-stabilized crushed stone subbase, the inner wall surface of the trapezoidal trough structure and the upper surface of the newly built graded crushed stone cushion structure, and vibrating and curing;
[0026] Step 7, laying a new cement-stabilized gravel upper base on the cement-stabilized gravel lower base, pouring an expansive concrete transition layer between the new cement-stabilized gravel upper base, the cement-stabilized gravel lower base, the porous concrete drainage layer and the old cement-stabilized gravel upper base, and performing vibration and curing;
[0027] Step 8, overlap the polyester glass fiber cloth layer on the butt cut of the old asphalt surface layer, the expansion concrete transition layer and the newly built cement stabilized crushed stone upper base;
[0028] Step 9: Lay the newly built asphalt surface layer on the upper surface of the expansive concrete layer and the newly built cement-stabilized crushed stone upper base layer, and ensure that its side is spliced with the old asphalt surface layer to form the widened highway road surface.
[0029] In summary, the present invention includes at least one of the following beneficial technical effects:
[0030] The present invention can provide a widening structure for asphalt pavement during reconstruction and expansion of expressways. The expansion concrete layer can fill and compact the gap between the new and old pavement bases, reduce the shrinkage of concrete, increase the connection between the new and old pavement bases, thereby improving the splicing quality and preventing cracks and diseases.
[0031] The porous concrete drainage layer has good drainage performance, which can effectively drain moisture from the pavement structure, prevent moisture accumulation, and reduce the occurrence of pavement diseases, thereby effectively solving problems such as loose connections, cracks, and poor drainage at the joints between new and old pavements. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Figure 1 It is a schematic diagram of the longitudinal section principle of a widening structure of an asphalt pavement for reconstruction and expansion of a highway according to the present invention;
[0033] Figure 2 It is a schematic diagram of a top view of a grid skeleton structure of an asphalt pavement widening structure for highway reconstruction and expansion according to the present invention;
[0034] Figure 3 It is a schematic diagram of the cross-sectional structure of the widening structure of the asphalt pavement of a highway reconstruction and expansion according to the present invention, in which the old cement-stabilized crushed stone subbase and the porous concrete drainage layer are connected;
[0035] Figure 4 It is a schematic diagram of the longitudinal section principle of an asphalt pavement widening structure for highway reconstruction and expansion according to the present invention, with the grid skeleton structure removed.
[0036] Explanation of the accompanying drawings: 3. The old pavement structure includes the old asphalt surface layer; 4. The old cement-stabilized gravel upper base layer; 5. The old cement-stabilized gravel lower base layer; 6. The old cement-stabilized gravel subbase layer; 1. Expansive concrete layer; 2. Porous concrete drainage layer; 7. Newly built asphalt surface layer; 8. Newly built cement-stabilized gravel upper base layer; 9. Newly built cement-stabilized gravel lower base layer; 10. Newly built cement-stabilized gravel subbase layer; 11. Newly built graded gravel cushion structure; 12. Polyester glass fiber cloth layer; 13. Grid skeleton structure; 131. Pillars; 132. Frame; 100. New roadbed. DETAILED DESCRIPTION
[0037] The present invention is further described in detail below in conjunction with the accompanying drawings.
[0038] The embodiment of the invention discloses an asphalt pavement widening structure for reconstruction and expansion of a highway.
[0039] Reference Figure 1 - Figure 4Embodiment 1, a highway asphalt pavement widening structure, the old pavement structure includes an old asphalt surface layer 3, an old cement stabilized gravel upper base layer 4, an old cement stabilized gravel lower base layer 5 and an old cement stabilized gravel subbase layer 6, the old cement stabilized gravel subbase layer 5 is laid on the upper surface of the old cement stabilized gravel subbase layer 6, the old cement stabilized gravel upper base layer 4 is laid on the upper surface of the old cement stabilized gravel lower base layer 5, and the old asphalt surface layer 3 is laid on the upper surface of the old cement stabilized gravel upper base layer 4; the highway asphalt pavement widening structure includes an expansive concrete layer 1, a porous concrete drainage layer 2, a newly built asphalt surface layer 7, a newly built cement stabilized gravel upper base layer 8, a newly built cement stabilized gravel lower base layer 9, a newly built cement stabilized gravel subbase layer 10 and a newly built graded gravel cushion layer structure 11, the newly built graded gravel cushion layer structure 11 is laid on a newly built roadbed 100, and the side of the porous concrete drainage layer 2 is connected to the old cement stabilized gravel lower base layer 5 and the old cement stabilized gravel The splicing side of the fixed gravel subbase 6 is connected, and the bottom is connected to the top surface of the newly built graded gravel cushion structure 11. The newly built cement stabilized gravel subbase 10 is laid on the upper surface of the newly built graded gravel cushion structure 11. The newly built cement stabilized gravel lower base 9 is laid on the upper surface of the newly built cement stabilized gravel subbase 10. The sides of the newly built cement stabilized gravel lower base 9 and the newly built cement stabilized gravel subbase 10 are both connected to the porous concrete drainage layer 2. The side of the expansive concrete layer 1 is connected to the old cement stabilized gravel upper base 4, and the bottom is connected to the porous concrete drainage layer 2 and the upper surface of the newly built cement stabilized gravel lower base 9. The bottom of the newly built cement stabilized gravel upper base 8 is laid on the upper surface of the newly built cement stabilized gravel lower base 9, and the side is connected to the other side of the expansive concrete layer 1. The newly built asphalt surface layer 7 is laid on the upper surfaces of the expansive concrete layer 1 and the newly built cement stabilized gravel upper base 8, and the side is spliced with the old asphalt surface layer 3 to form the widened highway pavement.
[0040] The expansive concrete layer 1 can fill and compact the gap between the new and old pavement bases, reduce the shrinkage of the concrete, and increase the connection between the new and old pavement bases, thereby improving the splicing quality and preventing cracks and defects.
[0041] After the internal water is collected from the porous concrete drainage layer 2, it seeps out from the newly built cement-stabilized gravel lower base 9, the newly built cement-stabilized gravel subbase 10, and the outer side of the newly built graded gravel cushion structure 11, preventing moisture accumulation and affecting the service life of the road surface; the porous concrete drainage layer 2 has good drainage performance, which can effectively drain moisture from the road surface structure, prevent moisture accumulation, and reduce the occurrence of road surface diseases, thereby effectively solving problems such as loose connections, cracks, and poor drainage at the joints of the new and old road surfaces.
[0042] In Example 2, the asphalt pavement widening structure for highway reconstruction and expansion further includes a polyester glass fiber cloth layer 12 , and the polyester glass fiber cloth layer 12 is overlapped between the old asphalt surface layer 3 and the newly built asphalt surface layer 7 .
[0043] In Example 3, a butt cut is provided on one side of the old asphalt surface layer 3, and a lap block is provided on one side of the new asphalt surface layer 7. The lap block is laid on the butt cut, and the polyester glass fiber cloth layer 12 is laid on the upper surface of the butt cut and extends into the bottom of the new asphalt surface layer 7 by one to two meters.
[0044] The polyester glass fiber cloth layer 12 serves as a splicing layer, and plays a key role between the old asphalt surface layer 3 and the newly built asphalt surface layer 7. The polyester glass fiber cloth has a high tensile strength, and can effectively resist the tensile stress caused by temperature changes, vehicle loads and other factors on the asphalt surface layer, and prevent the generation and expansion of reflective cracks. The polyester glass fiber cloth has good flexibility, and can adapt to the deformation of the asphalt surface layer, and avoid cracks caused by excessive deformation. The polyester glass fiber cloth can enhance the interface bonding between the new and old pavements, prevent water from penetrating, and reduce the occurrence of pavement diseases. The polyester glass fiber cloth has good shear resistance, and can effectively resist the shear stress caused by vehicle loads on the asphalt surface layer, and prevent the pavement from slipping, rutting and other diseases. Preventing the generation and expansion of reflective cracks can effectively extend the service life of the pavement, and enhancing the bonding between the new and old pavements can reduce the occurrence of pavement diseases, thereby extending the service life of the pavement. The polyester glass fiber cloth is easy to lay, and the construction is convenient and quick. The polyester glass fiber cloth has stable quality and reliable performance.
[0045] In Example 4, a trapezoidal groove structure is set on the splicing side of the old cement stabilized gravel upper base 4, the old cement stabilized gravel lower base 5 and the old cement stabilized gravel bottom base 6, and a corresponding boss structure is set on the splicing side of the expansive concrete layer 1 and the porous concrete drainage layer 2, and the boss structure is embedded in the trapezoidal groove structure.
[0046] The splicing method of setting up a trapezoidal groove structure and a boss structure can strengthen the connection between the new and old pavements and improve the overall performance of the splicing structure. The boss structure is embedded in the trapezoidal groove structure to form a mechanical bite, which can significantly improve the connection strength between the new and old pavements and prevent the occurrence of delamination, displacement and other defects. The setting of the trapezoidal groove structure and the boss structure can increase the contact area between the new and old pavements, enhance the interface bonding, and improve the overall strength of the splicing structure. The boss structure is embedded in the trapezoidal groove structure, which can reduce the stress concentration between the new and old pavements and prevent the generation and expansion of reflective cracks. The setting of the trapezoidal groove structure and the boss structure can adapt to the deformation between the new and old pavements and avoid cracks caused by excessive deformation.
[0047] Embodiment 5 further includes a grid skeleton structure 13 , which is laid on the interface between the newly built cement-stabilized crushed stone subbase 10 and the newly built graded crushed stone cushion structure 11 , and the bottom of the grid skeleton structure 13 is connected to the newly built roadbed 100 .
[0048] In Example 6, the grid skeleton structure 13 includes multiple pillars 131 and a frame 132. The tops of the multiple pillars 131 are welded to the bottom of the frame 132, and the bottom is connected to the newly built roadbed 100. The frame 132 is laid on the joint surface of the newly built cement-stabilized crushed stone subbase 10 and the newly built graded crushed stone cushion structure 11.
[0049] The grid keel structure 13 can distribute the vehicle load to a larger area, reduce the stress concentration of the roadbed, and thus improve the stability of the roadbed. The grid keel structure 13 can limit the lateral deformation of the roadbed, prevent the roadbed from settling, and ensure the flatness of the road surface. The grid keel structure 13 can increase the drainage channel inside the roadbed, speed up the discharge of water, and prevent water accumulation from affecting the stability of the roadbed.
[0050] Example 7: The porosity of the porous concrete drainage layer 2 is 15%-30%.
[0051] The porosity of the porous concrete drainage layer 2 ranges from 15% to 30%. When the porosity is lower than 15%, the drainage performance may be insufficient and it may be difficult to effectively drain the moisture inside the pavement structure. When the porosity is higher than 30%, the strength and durability of the concrete may be affected and it may be prone to cracking and damage.
[0052] The components of the porous concrete drainage layer 2 include: cement, sand, gravel, admixture and water;
[0053] The cement used is P.O42.5 ordinary Portland cement; the sand used is medium sand or coarse sand with a fineness modulus of 2.3-3.1; the gravel used is crushed stone with a particle size of 5-20mm; the admixtures used are fly ash, slag powder, etc.; the water needs to meet the requirements for concrete mixing water.
[0054] Embodiment 8, a construction process of a highway reconstruction and expansion asphalt pavement widening structure, using a highway reconstruction and expansion asphalt pavement widening structure to widen the old pavement structure, including the following steps:
[0055] Step 1, use a milling machine to process the old road surface structure, make the old asphalt surface layer 3 reach the design elevation, set trapezoidal groove structures on the joint sides of the old cement stabilized gravel upper base 4, the old cement stabilized gravel lower base 5 and the old cement stabilized gravel bottom base 6, and open a butt cut on the old asphalt surface layer 3;
[0056] Step 2, constructing a new roadbed 100 according to design requirements and compacting it;
[0057] Step 3, placing the grid skeleton structure 13 on the newly built roadbed 100, laying a crushed stone cushion layer on the newly built roadbed 100 and compacting it to form a newly built graded crushed stone cushion layer structure 11, laying crushed stone on the grid skeleton structure 13 and compacting it to form a newly built cement-stabilized crushed stone subbase 10;
[0058] Step 4, laying a cement-stabilized crushed stone lower base layer 9 on the cement-stabilized crushed stone base layer 10 and compacting it;
[0059] Step 5, pouring an expansive concrete transition layer 1 on the cement-stabilized gravel lower base 9, and vibrating and curing it to ensure that the side of the expansive concrete transition layer 1 is connected to the old cement-stabilized gravel upper base 4, and the bottom is connected to the porous concrete drainage layer 2 and the upper surface of the newly built cement-stabilized gravel lower base 9;
[0060] Step 6, pouring a porous concrete drainage layer 2 between the joint side of the cement-stabilized crushed stone lower base 9 and the cement-stabilized crushed stone subbase 10, the inner wall surface of the trapezoidal trough structure and the upper surface of the newly built graded crushed stone cushion structure 11, and vibrating and curing;
[0061] Step 7, laying a new cement-stabilized gravel upper base 8 on the cement-stabilized gravel lower base 9, pouring an expansive concrete transition layer 1 between the new cement-stabilized gravel upper base 8, the cement-stabilized gravel lower base 9, the porous concrete drainage layer 2 and the old cement-stabilized gravel upper base 4, and vibrating and curing;
[0062] Step 8, overlapping the polyester glass fiber cloth layer 12 on the butt cut of the old asphalt surface layer 3, the expansive concrete transition layer 1 and the newly built cement stabilized crushed stone upper base layer 8;
[0063] Step 9, laying the newly built asphalt surface layer 7 on the upper surface of the expansive concrete layer 1 and the newly built cement-stabilized crushed stone upper base layer 8, and ensuring that its side surface is spliced with the old asphalt surface layer 3 to form a widened highway road surface.
[0064] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A highway reconstruction and expansion asphalt pavement widening structure, the old pavement structure comprises an old asphalt surface layer (3), an old cement stabilized gravel upper base layer (4), an old cement stabilized gravel lower base layer (5) and an old cement stabilized gravel subbase layer (6), the old cement stabilized gravel lower base layer (5) is laid on the upper surface of the old cement stabilized gravel subbase layer (6), the old cement stabilized gravel upper base layer (4) is laid on the upper surface of the old cement stabilized gravel lower base layer (5), and the old asphalt surface layer (3) is laid on the upper surface of the old cement stabilized gravel upper base layer (4); characterized in that: The asphalt pavement widening structure for the reconstruction and expansion of a highway comprises an expansive concrete layer (1), a porous concrete drainage layer (2), a newly built asphalt surface layer (7), a newly built cement stabilized gravel upper base layer (8), a newly built cement stabilized gravel lower base layer (9), a newly built cement stabilized gravel subbase layer (10) and a newly built graded gravel cushion layer structure (11), wherein the newly built graded gravel cushion layer structure (11) is laid on a newly built roadbed (100), the side surface of the porous concrete drainage layer (2) is connected to the splicing side of the old cement stabilized gravel lower base layer (5) and the old cement stabilized gravel subbase layer (6), and the bottom is connected to the top surface of the newly built graded gravel cushion layer structure (11), the newly built cement stabilized gravel subbase layer (10) is laid on the upper surface of the newly built graded gravel cushion layer structure (11), and the newly built cement stabilized gravel lower base layer ( 9) is laid on the upper surface of the newly built cement stabilized gravel base layer (10), the sides of the newly built cement stabilized gravel base layer (9) and the newly built cement stabilized gravel base layer (10) are both connected to the porous concrete drainage layer (2), the side of the expansive concrete layer (1) is connected to the old cement stabilized gravel upper base layer (4), and the bottom is connected to the porous concrete drainage layer (2) and the upper surface of the newly built cement stabilized gravel lower base layer (9), the bottom of the newly built cement stabilized gravel upper base layer (8) is laid on the upper surface of the newly built cement stabilized gravel lower base layer (9), and the side is connected to the other side of the expansive concrete layer (1), the newly built asphalt surface layer (7) is laid on the upper surface of the expansive concrete layer (1) and the newly built cement stabilized gravel upper base layer (8), and the side is spliced with the old asphalt surface layer (3) to form the widened road surface.
2. The asphalt pavement widening structure for highway reconstruction and expansion according to claim 1 is characterized by: The asphalt pavement widening structure for highway reconstruction and expansion also includes a polyester glass fiber cloth layer (12), wherein the polyester glass fiber cloth layer (12) is overlapped between the old asphalt surface layer (3) and the newly built asphalt surface layer (7).
3. The asphalt pavement widening structure for highway reconstruction and expansion according to claim 2 is characterized by: A butt cut is provided on one side of the old asphalt surface layer (3) for splicing, and a lap block is provided on one side of the new asphalt surface layer (7) for splicing. The lap block is laid on the butt cut, and the polyester glass fiber cloth layer (12) is laid on the upper surface of the butt cut and extends into the bottom of the new asphalt surface layer (7) by one to two meters.
4. The asphalt pavement widening structure for highway reconstruction and expansion according to claim 3 is characterized by: A trapezoidal groove structure is arranged on the joint sides of the old cement stabilized gravel upper base (4), the old cement stabilized gravel lower base (5) and the old cement stabilized gravel bottom base (6), and a corresponding boss structure is arranged on the joint sides of the expansion concrete layer (1) and the porous concrete drainage layer (2), and the boss structure is embedded in the trapezoidal groove structure.
5. The asphalt pavement widening structure for highway reconstruction and expansion according to claim 4 is characterized by: It also includes a grid skeleton structure (13), which is laid on the interface between the newly built cement-stabilized crushed stone subbase (10) and the newly built graded crushed stone cushion structure (11), and the bottom of the grid skeleton structure (13) is connected to the newly built roadbed (100).
6. The asphalt pavement widening structure for highway reconstruction and expansion according to claim 5 is characterized by: The grid skeleton structure (13) comprises a plurality of pillars (131) and a frame (132), wherein the tops of the plurality of pillars (131) are welded to the bottom of the frame (132), and the bottom is connected to the newly built roadbed (100), and the frame (132) is laid on the joint surface between the newly built cement-stabilized crushed stone subbase (10) and the newly built graded crushed stone cushion structure (11).
7. The asphalt pavement widening structure for highway reconstruction and expansion according to claim 6 is characterized by: The porosity of the porous concrete drainage layer (2) is 15%-30%.
8. A construction process for widening an asphalt pavement structure for highway reconstruction and expansion, characterized in that: The method of widening an old road surface structure by using the asphalt road surface widening structure for highway reconstruction and expansion as claimed in claim 7 comprises the following steps: Step 1, using a milling machine to process the old road surface structure, so that the old asphalt surface layer (3) reaches the designed elevation, and respectively setting a trapezoidal groove structure on the joint sides of the old cement stabilized gravel upper base (4), the old cement stabilized gravel lower base (5) and the old cement stabilized gravel bottom base (6), and opening a butt joint incision on the old asphalt surface layer (3); Step 2, constructing a new roadbed (100) according to design requirements and compacting it; Step 3, placing the grid skeleton structure (13) on the newly built roadbed (100), laying a crushed stone cushion layer on the newly built roadbed (100) and compacting it to form a newly built graded crushed stone cushion layer structure (11), laying crushed stone on the grid skeleton structure (13) and compacting it to form a newly built cement-stabilized crushed stone subbase (10); Step 4, laying a cement-stabilized crushed stone lower base (9) on the cement-stabilized crushed stone base (10) and compacting it; Step 5, pouring an expansive concrete transition layer (1) on the cement-stabilized crushed stone lower base (9), and performing vibration and curing to ensure that the side of the expansive concrete transition layer (1) is connected to the old cement-stabilized crushed stone upper base (4), and the bottom is connected to the porous concrete drainage layer (2) and the upper surface of the newly built cement-stabilized crushed stone lower base (9); Step 6, pouring a porous concrete drainage layer (2) between the joint side of the cement-stabilized crushed stone lower base (9) and the cement-stabilized crushed stone subbase (10), the inner wall surface of the trapezoidal trough structure and the upper surface of the newly built graded crushed stone cushion structure (11), and vibrating and curing; Step 7, laying a newly built cement-stabilized gravel upper base (8) on the cement-stabilized gravel lower base (9), pouring an expansive concrete transition layer (1) between the newly built cement-stabilized gravel upper base (8), the cement-stabilized gravel lower base (9), the porous concrete drainage layer (2) and the old cement-stabilized gravel upper base (4), and performing vibration and curing; Step 8, overlapping the polyester glass fiber cloth layer (12) on the butt cut of the old asphalt surface layer (3), the expansion concrete transition layer (1) and the newly built cement stabilized crushed stone upper base layer (8); Step 9, laying the newly built asphalt surface layer (7) on the upper surface of the expansive concrete layer (1) and the newly built cement-stabilized crushed stone upper base layer (8), and ensuring that its side surface is spliced with the old asphalt surface layer (3) to form the widened highway road surface.