Urban road structure based on toughness design

Abstract

The invention relates to an urban road structure based on toughness design, the urban road structure comprises a sidewalk arranged on the outer side, a motor vehicle lane arranged on the inner side and an underground pipeline, the toughness design concept is adopted, the pavement structure is mainly made of flexible or semi-flexible materials, and the top of the underground pipeline adopts a composite geotechnical structure-double-layer toughness structure layer; a gravel pile flexible supporting structure is adopted on the two sides, a pipeline, roadbed and pavement integrated structure is provided, a sidewalk adopts a double-layer permeable layer, the use durability of permeable pavement of a sponge city is improved, a motor vehicle lane adopts a double-layer semi-flexible base layer, and the motor vehicle lane and a composite geotechnical structure-double-layer tough structure layer on the top of the pipeline are combined together. And rapid pavement collapse caused by possible sudden local underground subsidence or water and soil loss is effectively dealt with, so that associated hazards possibly caused by collapse are greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of urban road engineering, and particularly relates to a high-sealing urban road structure based on a toughness design. BACKGROUND

[0002] Toughness urban road construction is one of the contents of toughness urban construction. As the main carrier of urban lifeline engineering, urban roads, together with supporting drainage, water supply, gas supply, heat supply, pipe gallery and the like, form an infrastructure network that maintains the normal operation of the city and guarantees the life and social and economic activities of residents. Urban lifeline safety engineering construction is carried out from the perspective of the safe operation of urban lifelines, aiming to prevent major safety accidents such as urban waterlogging, road collapse, bridge and tunnel collapse, gas explosion, house collapse and river and lake pollution. According to the requirements of urban lifeline safety engineering construction, toughness urban road construction is very important. In the early stage of toughness urban road construction, toughness structure design should be strengthened, and hidden danger identification and intelligent perception should be strengthened during operation.

[0003] In the prior art, there are few records about the research and specific methods of toughness urban road subgrade pavement structure. SUMMARY

[0004] In view of the possible road collapse caused by pipelines, geology and the like, the present application adopts a toughness design concept to provide a high-sealing urban road structure based on a toughness design, which effectively deals with the possible sudden local subsidence or water and soil loss caused road collapse, thereby greatly reducing the possible secondary damage caused by collapse.

[0005] The technical scheme adopted by the present application is: an urban road structure based on a toughness design, comprising a sidewalk arranged on the outer side, a motor vehicle lane arranged on the inner side and an underground pipeline, characterized in that: the sidewalk pavement structure comprises, from top to bottom, water-permeable bricks + double-liquid crack pouring surface layer, dry-hard cement mortar leveling layer, polymer water-permeable concrete base layer, geocell + graded gravel toughness layer and semi-flexible upper road bed, the motor vehicle lane pavement structure comprises, from top to bottom, AC-13C asphalt concrete upper surface layer, AC-20C asphalt concrete lower surface layer, large-void asphalt macadam + polymer mortar grouting upper base layer, large-void asphalt macadam + cement mortar grouting lower base layer, polymer water-permeable concrete drainage leveling layer, geocell + graded gravel + low-dose cement toughness layer, geocell + graded gravel toughness upper road bed and semi-flexible lower road bed, an upper support structure is arranged above the underground pipeline, and side support structures are symmetrically arranged on both sides; the top of the side support structure is flush with the upper support structure, and the bottom is lower than the underground pipeline.

[0006] As a preferred option, the thickness of the permeable brick + double-liquid grouting surface layer is 5cm, the gap between the permeable bricks is 1cm, and the grouting treatment is carried out using a double-liquid mixture of cement slurry and water glass liquid with a ratio of 1:1 to 1:0.75, and the water glass liquid has a Baume degree of 35 to 40.

[0007] Preferably, the polymer permeable concrete base layer uses resin adhesive as the binder, with a compressive strength of not less than 10MPa and a permeability coefficient greater than 1mm / s; the geocells in the geocell + graded crushed stone toughening layer are reinforced, with a strip tensile strength greater than 40kN / m and a joint tensile strength greater than 150N / mm.

[0008] As a preferred option, the semi-flexible subgrade is reinforced with 8% two-component cement slurry: water glass liquid = 1:1 to 1:0.75.

[0009] As a preferred option, in the upper base layer of the large-void asphalt macadam + polymer mortar grouting, the porosity of the large-void asphalt macadam is 20~25, the interconnected porosity is 15~18, the polymer resin bonding strength in the polymer mortar is greater than 2.5MPa, and the polymer-to-ash ratio is 20%.

[0010] As a preferred option, the porosity of the large-void asphalt macadam in the base course grouting with cement mortar is 25-28%, the interconnected porosity is 18-20%, the water-cement ratio of the cement grout is 0.45~0.5, and the 7-day compressive strength is not less than 20MPa.

[0011] As a preferred option, the cement mortar content in the geocell + graded crushed stone + low-dose cement toughening layer is 5%.

[0012] Preferably, the upper support structure is located 0.5m above the underground pipeline; the side support structures are located 0.5m on both sides of the underground pipeline, and the bottom is located 0.5m below the underground pipeline.

[0013] Preferably, the upper support structure comprises, from top to bottom, a first upper support unidirectional fiber-plastic geogrid, a first upper support geocell + graded crushed stone toughening layer, a second upper support unidirectional fiber-plastic geogrid, a second upper support geocell + graded crushed stone toughening layer, and a third upper support unidirectional fiber-plastic geogrid. The longitudinal nominal tensile strength of the first upper support unidirectional fiber-plastic geogrid, the second upper support unidirectional fiber-plastic geogrid, and the third upper support unidirectional fiber-plastic geogrid is not less than 400kN / m.

[0014] As a preferred option, the side support structure consists of a gravel pile with a diameter of 0.5m, a double-liquid grouting system, and multiple CFRP anchor bundles arranged in an alternating pattern. The gravel piles and double-liquid grouting system have a diameter of 0.5m. After filling the borehole with graded gravel, the double-liquid system is injected. The ratio of cement grout to water glass is 1:1 to 1:0.75, and the water glass has a Baume degree of 35 to 40. The CFRP anchor bundles are made of multiple CFRP reinforcing bars with a diameter of 25mm. The standard value of their tensile strength is ≥1800MPa, and their elastic modulus is ≥140GPa. The borehole diameter is 110mm. After inserting the anchor bundles, the double-liquid mortar is used for grouting and curing. The ratio of cement grout to water glass to fine sand is 1:1:0.5, and the water glass has a Baume degree of 35 to 40.

[0015] Preferably, the concrete base is in the shape of a straight line or a trapezoid.

[0016] The beneficial effects of this invention are as follows: This invention adopts a resilience design concept, with the road surface structure primarily composed of flexible or semi-flexible materials. The top of underground pipelines utilizes a composite geotechnical structure—a double-layer resilience structure—while the sides employ a crushed stone pile flexible support structure. This proposes an integrated structure for pipelines, roadbed, and road surface. The sidewalks utilize a double-layer permeable layer, improving the durability of permeable pavement in sponge cities. The motor vehicle lanes utilize a double-layer semi-flexible base layer. Together with the composite geotechnical structure—a double-layer resilience structure—topped with the pipelines, this effectively addresses the potential for sudden localized underground subsidence or rapid road collapse caused by soil erosion, thereby significantly reducing the potential collateral damage caused by collapse. This invention has the following advantages: 1. Urban road structures are mainly made of flexible and semi-flexible materials, which have strong deformation adaptability in response to sudden collapses, pipeline detachment, and foundation settlement. 2. The sidewalk pavement structure is based on the sponge city and resilient design concepts. It adopts a double-layer permeable pavement structure, which has stronger water permeability than the traditional permeable pavement structure. The surface layer uses double liquid for grouting the gaps between the bricks, and the upper roadbed is reinforced with 8% double liquid. This improves the overall durability of the structure while meeting the deformation capacity requirements. 3. The pavement structure of the carriageway adopts different types of double-layer semi-flexible base layer, and the subbase layer adopts toughening layer and anti-freeze drainage leveling layer, taking into account economy, deformation capacity and durability. 4. The underground pipeline support structure is based on the toughness design concept. The two sides adopt a combination of double liquid grouting crushed stone piles and CFRP anchor bar bundles as the support structure, and the top adopts fiber plastic geogrid + toughening layer. This effectively copes with the sudden collapse of the road surface caused by underground pipeline settlement or soil erosion, and indirectly improves the service durability of the road structure. Attached Figure Description

[0017] Fig. 1 This is a cross-sectional view of the urban road structure of the present invention; Fig. 2 This is a cross-sectional view of the side support structure; The components include: 1. Sidewalk; 11. Permeable brick + double-liquid grouting surface layer; 12. Dry-hardened cement mortar leveling layer; 13. Polymer permeable concrete base layer; 14. Geocell + graded crushed stone toughening layer; 15. Semi-flexible subgrade. 2. Motor vehicle lane; 21. AC-13C asphalt concrete surface layer; 22. AC-20C asphalt concrete bottom layer; 23. Large-void asphalt macadam + polymer mortar grouting upper base course; 24. Large-void asphalt macadam + cement mortar grouting lower base course; 25. Polymer permeable concrete drainage and leveling layer; 26. Geocell + graded crushed stone + low-dose cement toughening layer; 27. Geocell + graded crushed stone toughening upper subgrade; 28. Semi-flexible lower subgrade; 3. Underground pipelines; 30. CFRP anchor bundles; 31. Crushed stone piles with double-liquid grouting; 32. First upper support unidirectional fiber-plastic geogrid; 33. First upper support geocells + graded crushed stone toughening layer; 34. Second upper support unidirectional fiber-plastic geogrid; 35. Second upper support geocells + graded crushed stone toughening layer; 36. Third upper support unidirectional fiber-plastic geogrid. Detailed Implementation

[0018] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figs. 1-2 As shown, the present invention discloses a highly sealed urban road structure based on a tough design, including a sidewalk 1, a motor vehicle lane 2, and an underground pipeline 3. The sidewalk 1 is located outside the motor vehicle lane 2. The pavement structure of the sidewalk 1, from top to bottom, includes a permeable brick + double liquid grouting surface layer 11 (thickness of 5cm), a dry hard cement mortar leveling layer 12 (thickness of 3cm), a polymer permeable concrete base layer 13 (thickness of 5cm), a geocell + graded crushed stone toughening layer 14 (thickness of 20cm), and a semi-flexible subgrade 15 (thickness of 30cm).

[0020] The motor vehicle lane 2 is laid inside the sidewalk 1. The pavement structure of the motor vehicle lane 2, from top to bottom, includes an AC-13C asphalt concrete surface layer 21 (thickness of 4cm), an AC-20C asphalt concrete bottom layer 22 (thickness of 6cm), a large-void asphalt macadam + polymer mortar grouting upper base layer 23 (thickness of 15cm), a large-void asphalt macadam + cement mortar grouting lower base layer 24 (thickness of 15cm), a polymer permeable concrete drainage and leveling layer 25 (thickness of 5cm), a geocell + graded crushed stone + low-dose cement toughening layer 26 (thickness of 20cm), a geocell + graded crushed stone toughening upper subgrade 27 (thickness of 30cm), and a semi-flexible lower subgrade 28 (thickness of 50cm).

[0021] The underground pipeline support structure is set below the motor vehicle lane 2, including an upper support structure and two side support structures. The upper support structure is located 0.5m above the underground pipeline 3. From top to bottom, it includes a first upper support unidirectional fiber-plastic geogrid 32, a first upper support geocell + graded crushed stone toughening layer 33, a second upper support unidirectional fiber-plastic geogrid 34, a second upper support geocell + graded crushed stone toughening layer 35, and a third upper support unidirectional fiber-plastic geogrid 36. The longitudinal nominal tensile strength of the first upper support unidirectional fiber-plastic geogrid 32, the second upper support unidirectional fiber-plastic geogrid 34, and the third upper support unidirectional fiber-plastic geogrid 3 is not less than 400kN / m, and they are connected to the geocells by nail guns. The two-sided support structure is located 0.5m on both sides of the underground pipeline 3. The top is flush with the upper support structure, and the bottom is located 0.5m below the underground pipeline 3. The structure consists of 0.5m diameter crushed stone piles + double liquid grouting 31 and 3 CFRP anchor bar bundles 20 with a diameter of 25mm arranged alternately with a spacing of 1m.

[0022] In this embodiment, the thickness of the permeable brick + double-liquid grouting surface layer 11 is 5cm, the gap between the permeable bricks is 1cm, and the grouting treatment is carried out with a cement slurry: water glass liquid ratio of 1:1 to 1:0.75, the water glass liquid is 35 to 40 Baume degrees, and after grouting, the gaps are swept with 2 to 5mm fine sand; the dry hard cement mortar leveling layer 12 has a strength of not less than M20, and the surface bricks can only be laid after the flatness meets the standard during construction; the polymer permeable concrete base layer 13 uses resin adhesive as the binder, the compressive strength is not less than 10MPa, and the permeability coefficient is greater than 1mm / s; in the geocell + graded crushed stone toughening layer 14, the geocell is reinforced, the strip tensile strength is greater than 40kN / m, and the joint tensile strength is greater than 150N / mm; the semi-flexible subgrade 15 is reinforced with 8% double-liquid, cement slurry: water glass liquid ratio of 1:1 to 1:0.75.

[0023] In this embodiment, the AC-13C asphalt concrete upper layer 21 and the AC-20C asphalt concrete lower layer 22 are laid after the base course has been cured for no less than 24 hours, and a modified emulsified asphalt tack coat is set underneath. In the large-void asphalt macadam + polymer mortar grouting upper base course 23, the porosity of the large-void asphalt macadam is 20~25, the interconnected porosity is 15~18, the polymer resin bonding strength in the polymer mortar is greater than 2.5MPa, and the polymer-cement ratio is 20%. In the large-void asphalt macadam + cement mortar grouting lower base course 24, the porosity of the large-void asphalt macadam is 25-28, the interconnected porosity is 18-20, the water-cement ratio of the cement grout is 0.45~0.5, and the 7-day compressive strength is not less than 20MPa. In the geocell + graded crushed stone + low-dose cement toughening layer 26, the cement mortar content is 5%, the geocell is filled with graded crushed stone and compacted before cement mortar is grouted, and the strength is M20.

[0024] In this embodiment, the longitudinal nominal tensile strength of the first upper support unidirectional fiber-plastic geogrid 32, the second upper support unidirectional fiber-plastic geogrid 34, and the third upper support unidirectional fiber-plastic geogrid 3 is not less than 400kN / m.

[0025] In this embodiment, the diameter of the crushed stone pile + double-liquid grout 31 is 0.5m. After drilling and filling the hole with graded crushed stone, the double-liquid grout (cement grout: water glass liquid = 1:1 to 1:0.75, water glass liquid is 35 to 40 Baume degrees) is injected. The CFRP anchor bar bundle 30 is made of 3 CFRP reinforcing bars with a diameter of 25mm for binding. Its tensile strength standard value is ≥1800MPa, elastic modulus is ≥140GPa, the drilling diameter is 110mm, and after inserting the anchor bar bundle, it is grouted and cured with double-liquid mortar (cement grout: water glass liquid: fine sand = 1:1:0.5, water glass liquid is 35 to 40 Baume degrees).

[0026] In this embodiment, the geocell + graded crushed stone toughening layer 14, the geocell + graded crushed stone toughening upper subgrade 27, the first upper support geocell + graded crushed stone toughening layer 33, and the second upper support geocell + graded crushed stone toughening layer 35 have the same structure and are made of the same material, but their thicknesses differ. Specifically, the geocell + graded crushed stone toughening layer 14 has a thickness of 20cm, the geocell + graded crushed stone toughening upper subgrade 27 has a thickness of 30cm, and the first upper support geocell + graded crushed stone toughening layer 33 and the second upper support geocell + graded crushed stone toughening layer 35 have a thickness of 25cm.

[0027] In this embodiment, the polymer permeable concrete base layer 13 and the polymer permeable concrete drainage and leveling layer 25 have the same structure, are made of the same material, and are both 5cm thick.

[0028] In this embodiment, the semi-flexible upper roadbed 15 and the semi-flexible lower roadbed 28 have the same structure and are made of the same material, but their thicknesses differ. Specifically, the semi-flexible upper roadbed 15 has a thickness of 30cm, and the semi-flexible lower roadbed 28 has a thickness of 50cm.

[0029] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this invention is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this invention are defined only by the scope of the claims.

[0030] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention should be considered within the protection scope of the present invention.

Claims

1. A resilient urban road structure, comprising a sidewalk (1) on the outer side, a motor vehicle lane (2) on the inner side, and an underground pipeline (3), characterized in that: The sidewalk (1) pavement structure, from top to bottom, includes permeable brick + double liquid grouting surface layer (11), dry hard cement mortar leveling layer (12), polymer permeable concrete base layer (13), geocell + graded crushed stone toughening layer (14) and semi-flexible subgrade (15). The pavement structure of the motor vehicle lane (2) from top to bottom includes, in sequence, an AC-13C asphalt concrete surface layer (21), an AC-20C asphalt concrete bottom layer (22), a large-void asphalt macadam + polymer mortar grouting upper base layer (23), a large-void asphalt macadam + cement mortar grouting lower base layer (24), a polymer permeable concrete drainage and leveling layer (25), a geocell + graded crushed stone + low-dose cement toughening layer (26), a geocell + graded crushed stone toughening upper subgrade (27), and a semi-flexible lower subgrade (28). The underground pipeline (3) is provided with an upper support structure above it and symmetrical side support structures on both sides; the top of the side support structure is flush with the upper support structure and the bottom is lower than the underground pipeline (3).

2. The urban road structure based on resilient design according to claim 1, characterized in that: The thickness of the permeable brick + double liquid grouting surface layer (11) is 5cm, the permeable brick paving gap is 1cm, and the cement slurry: water glass liquid = 1:1 to 1:0.75 is used for grouting treatment, and the water glass liquid is 35 to 40 Baume degrees.

3. The urban road structure based on resilient design according to claim 1, characterized in that: The polymer permeable concrete base layer (13) uses resin adhesive as the binder, with a compressive strength of not less than 10MPa and a permeability coefficient greater than 1mm / s; the geocells in the geocell + graded crushed stone toughening layer (14) are reinforced, with a strip tensile strength greater than 40kN / m and a node tensile strength greater than 150N / mm.

4. The urban road structure based on resilient design according to claim 1, characterized in that: The semi-flexible subgrade (15) is reinforced with 8% double liquid, with cement slurry: water glass liquid = 1:1 to 1:0.

75.

5. The urban road structure based on resilient design according to claim 1, characterized in that: In the base course of the large-void asphalt macadam + polymer mortar grouting (23), the porosity of the large-void asphalt macadam is 20~25, the interconnected porosity is 15~18, the polymer resin bonding strength in the polymer mortar is greater than 2.5MPa, and the polymer-ash ratio is 20%.

6. The urban road structure based on resilient design according to claim 1, characterized in that: In the base course of the large-void asphalt macadam + cement mortar grouting (24), the porosity of the large-void asphalt macadam is 25-28, the interconnected porosity is 18-20, the water-cement ratio of the cement grouting material is 0.45~0.5, and the 7-day compressive strength is not less than 20MPa.

7. The urban road structure based on resilient design according to claim 1, characterized in that: The cement mortar content in the geocell + graded crushed stone + low-dose cement toughening layer (26) is 5%.

8. The urban road structure based on resilient design according to claim 1, characterized in that: The upper support structure is located 0.5m above the underground pipeline; the side support structures are located 0.5m on both sides of the underground pipeline, and the bottom is located 0.5m below the underground pipeline.

9. The urban road structure based on resilient design according to claim 1, characterized in that: The upper support structure, from top to bottom, includes a first upper support unidirectional fiber-plastic geogrid (32), a first upper support geocell + graded crushed stone toughening layer (33), a second upper support unidirectional fiber-plastic geogrid (34), a second upper support geocell + graded crushed stone toughening layer (35), and a third upper support unidirectional fiber-plastic geogrid (36). The longitudinal nominal tensile strength of the first upper support unidirectional fiber-plastic geogrid (32), the second upper support unidirectional fiber-plastic geogrid (34), and the third upper support unidirectional fiber-plastic geogrid (36) is not less than 400kN / m.

10. The urban road structure based on resilient design according to claim 1, characterized in that: The side support structure consists of a gravel pile with a diameter of 0.5m and a double-liquid grouting (31) and multiple CFRP anchor bundles (30) arranged in an alternating manner. The gravel pile with double-liquid grouting (31) has a diameter of 0.5m. After filling the hole with graded gravel, double-liquid grouting is injected. The ratio of cement grout to water glass liquid is 1:1 to 1:0.75, and the water glass liquid has a Baume degree of 35 to 40. The CFRP anchor bundles (30) are made by binding multiple CFRP reinforcing bars with a diameter of 25mm. The standard value of their tensile strength is ≥1800MPa and their elastic modulus is ≥140GPa. The borehole diameter is 110mm. After inserting the anchor bundles, double-liquid mortar is used for grouting and curing. The ratio of cement grout to water glass liquid to fine sand is 1:1 to 0.5, and the water glass liquid has a Baume degree of 35 to 40.

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