Water-permeable road construction method

Abstract

The application belongs to the technical field of road engineering construction, and discloses a water-permeable road construction method, which comprises the following steps: S1, calculating the road bearing capacity, the water-permeable rate, and the aperture and opening interval of the water-permeable hole; S2, laying a road base and compacting it; S3, laying a water-permeable hole mold on the road base according to the opening interval; S4, pouring concrete to form a concrete roadbed and performing roughening treatment on the surface of the concrete roadbed; S5, preparing water-permeable concrete according to the water-permeable rate, pouring and filling the water-permeable concrete into each water-permeable hole on the concrete roadbed, and forming a water-permeable concrete layer on the concrete roadbed; and S6, laying a water-permeable asphalt layer. The construction method increases the water-permeable hole in the ordinary concrete roadbed, pours water-permeable concrete, combines the ordinary concrete roadbed with the water-permeable concrete, improves the water-permeable physical properties of the roadbed and increases the structural strength, thereby increasing the bearing capacity and water-permeable rate of the road.

Description

Technical Field

[0001] This invention relates to the field of road construction technology, and in particular to a method for constructing permeable roads. Background Technology

[0002] In modern cities, the surface is increasingly covered by reinforced concrete buildings and impermeable pavements. 80%-90% of rainwater cannot infiltrate into the ground and must be discharged into pipes, leading to excessive drainage pressure. This also causes problems such as water accumulation on roads, affecting traffic safety, and damaging roadbeds. Therefore, permeable concrete, as a highly permeable pavement material, is widely used in plazas, pedestrian streets, parking lots, and other areas with relatively low traffic volume to solve practical problems such as road surface water accumulation and urban flooding, and to reduce the pressure on municipal drainage systems.

[0003] However, during the construction of municipal roads, situations often arise where the requirements for road load-bearing capacity, durability, and permeability are extremely high. While traditional methods using permeable concrete subgrade + permeable asphalt or ordinary concrete subgrade + ordinary asphalt can solve some of these problems, permeable concrete subgrades have lower strength and load-bearing capacity, and while ordinary concrete subgrades meet the load-bearing capacity and strength requirements, they cannot solve the permeability issue.

[0004] Therefore, there is an urgent need for a permeable road construction method to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a method for constructing permeable roads, which improves the permeability of the roadbed and enhances its structural strength, thereby increasing the road's load-bearing capacity and permeability.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The construction method for permeable roads includes the following steps:

[0008] S1. Calculate the road bearing capacity, permeability, and the diameter and spacing of the permeable holes;

[0009] S2. Lay the road base layer and compact it;

[0010] S3. Lay permeable hole molds on the road base according to the hole spacing;

[0011] S4. Pour concrete to form a concrete roadbed, and roughen the surface of the concrete roadbed.

[0012] S5. Prepare permeable concrete according to the permeability, pour the permeable concrete into each permeable hole on the concrete subgrade, and make the permeable concrete form a permeable concrete layer on the concrete subgrade.

[0013] S6. Lay a permeable asphalt layer.

[0014] Optionally, in step S1, the permeability is calculated using the following formula:

[0015] Permeability = (Longitudinal cross-sectional area - Transverse cross-sectional area) / Longitudinal cross-sectional area;

[0016] Longitudinal cross-sectional area = width * depth.

[0017] Optionally, step S1 includes the following steps:

[0018] S11. Calculate the density of the air pores per unit area, i.e., the porosity, based on the pore diameter and the spacing between the pores.

[0019] S12. Calculate the actual effective area of ​​the concrete subgrade based on the porosity;

[0020] S13. Calculate the bearing capacity of the concrete subgrade based on the design strength of the concrete and the design load of the road section;

[0021] S14. Calculate the actual bearing capacity of the concrete subgrade based on the actual effective area and bearing capacity.

[0022] S15. Compare the actual bearing capacity with the design bearing capacity to determine the impact of permeable holes on the bearing capacity of concrete subgrade.

[0023] Optionally, in step S11, the pore area of ​​the permeable holes is calculated using the following formula:

[0024] Ahole = (Qd - Qr) / (Pc * C)

[0025] Where Qd is the design bearing capacity, Qr is the existing load on the subgrade, Pc is the ratio of the hole area to the subgrade area (for example, 0.1 means that the hole area is 10% of the subgrade area), and C is the reduction factor of the hole on the subgrade bearing capacity.

[0026] Optionally, in step S11, the opening spacing of the permeable holes is calculated using the following formula:

[0027] S hole =A hole / P hole ;

[0028] Among them, P hole Pore ​​density is the ratio of the pore area to the spacing between openings.

[0029] Optionally, in step S1, the actual bearing capacity of the concrete subgrade is calculated using the following formula:

[0030] 1) P = (A hole ) / (A);

[0031] Where P is porosity, A hole The total area of ​​the holes is represented by A, where A is the area of ​​the roadbed.

[0032] 2) Aa = (1-P)*(A);

[0033] Where Aa is the actual effective area;

[0034] 3) Qa = Qd * (Aa / A);

[0035] Where Qa is the actual bearing capacity and Qd is the design bearing capacity.

[0036] Optionally, in step S2, the road base is paved with lime-soil and graded crushed stone, covering the road surface and compacted, with a compaction coefficient of not less than 0.9.

[0037] Optionally, the permeable hole mold includes multiple column molds that correspond one-to-one with the location of the permeable holes. The tops of the multiple column molds are fixed by positioning ribs. The height of the column molds is the same as the height of the concrete subgrade to be poured, and the diameter of the column molds is equal to the calculated diameter of the permeable holes.

[0038] Optionally, step S4 specifically includes the following steps:

[0039] S41. Pour concrete on the road base after laying the permeable hole mold, the pouring height of the concrete is equal to the height of the permeable hole mold, and vibrate the concrete to make it dense.

[0040] S42. After the concrete has initially set, roughen the upper surface of the concrete by applying horizontal stripes.

[0041] S43. Cover with film and water for curing, with a curing time of not less than 7 days, to form a concrete roadbed.

[0042] Optionally, in step S5, the permeability of the permeable concrete is calculated using Darcy's law:

[0043] Q = K * I * A

[0044] Where Q is the water flow rate per unit time, in cubic meters per second; K is the permeability coefficient, in meters per second; I is the water pressure gradient, in Pascals per meter; and A is the cross-sectional area, in square meters.

[0045] The beneficial effects of this invention are:

[0046] The permeable road construction method provided by this invention requires pre-construction preparations, such as calculating the road's bearing capacity, permeability, and the diameter and spacing of the permeable holes. Next, following standard construction steps: First, the road base is laid and compacted; this step ensures a smooth road surface. Then, permeable hole molds are laid on the road base according to the calculated hole diameter and spacing. Next, concrete is poured to form a concrete subgrade. Then, permeable concrete is poured, filling each permeable hole in the concrete subgrade and forming a permeable concrete layer. Finally, a permeable asphalt layer is laid. In other words, this construction method ensures that surface water can infiltrate downwards through permeable holes by pre-reserving permeable holes in a regular concrete subgrade, then pouring permeable concrete to fill these holes. The permeable concrete layer effectively absorbs rainwater and groundwater, preventing large amounts of runoff and mitigating soil erosion and surface runoff impact to some extent. The road foundation structure, combining a permeable concrete layer with a conventional concrete subgrade, provides the entire subgrade system with excellent permeability, reducing the impact of surface water on vehicle safety. The permeable concrete layer effectively drains rainwater, minimizing slippage and improving the road's skid resistance. The conventional concrete subgrade, with its good load-bearing capacity, effectively distributes vehicle loads, maintaining overall road stability. This multi-layered structure offers excellent compressive strength and durability, meeting the needs of various road construction projects and extending the road's service life. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0048] Figure 1 This is a flowchart of the permeable road construction method provided in the embodiments of the present invention. Detailed Implementation

[0049] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0052] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0053] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0054] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0056] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0057] like Figure 1 As shown in the figure, this embodiment provides a method for constructing a permeable road, including the following steps:

[0058] S1. Calculate the road's bearing capacity, permeability, and the diameter and spacing of the permeable holes. In this step, firstly, the road's bearing capacity and permeability need to be determined based on the road's usage direction; then, the diameter and spacing of the permeable holes are calculated based on the road's bearing capacity.

[0059] Specifically, when determining the road bearing capacity based on the direction of road use, it is necessary to consider environmental factors (such as soil conditions such as water level, temperature and humidity) as well as traffic flow and vehicle quality factors (i.e., the number and quality of vehicles passing through the road each day). Based on this, the road bearing capacity can be calculated according to demand.

[0060] More specifically, when determining road permeability based on road usage direction, factors such as road design (e.g., slope, curves), road structure (e.g., road surface texture, foundation, and drainage structure), and surrounding environmental factors (e.g., rainfall, temperature, and soil type) all affect road permeability. After comprehensively considering these factors, road permeability can be calculated using the following formula:

[0061] Permeability = (Longitudinal cross-sectional area - Transverse cross-sectional area) / Longitudinal cross-sectional area;

[0062] Blockage rate = (Longitudinal cross-sectional area - Utilized area) / Longitudinal cross-sectional area;

[0063] Longitudinal cross-sectional area = width * depth.

[0064] More specifically, when calculating the aperture size and spacing of permeable holes in a road based on its bearing capacity, the following steps should be followed:

[0065] S11. Calculate the density per unit area of ​​the vents, i.e., the porosity, based on the pore diameter and spacing. Specifically, the pore diameter and spacing can be determined through actual measurement or construction design.

[0066] Preferably, in this embodiment, the vent is a circular hole. In this step, the pore area A of the water-permeable hole is calculated using the following formula. hole :

[0067] A hole = (Qd-Qr) / (Pc*C);

[0068] Where Qd is the design bearing capacity, Qr is the existing load on the subgrade, Pc is the ratio of the cavity area to the subgrade area (e.g., 0.1 indicates that the cavity area is 10% of the subgrade area), and C is the reduction factor of the cavity on the subgrade bearing capacity. It should be noted that the reduction factor C on the cavity's bearing capacity can be determined based on the actual situation, usually by referring to relevant design specifications or conducting field tests.

[0069] If the area of ​​a circle is known, its diameter can be calculated using the formula for the area of ​​a circle.

[0070] Furthermore, the opening spacing of the permeable holes is calculated using the following formula:

[0071] S hole =A hole / P hole ;

[0072] Among them, P hole Pore ​​density is the ratio of the pore area to the spacing between openings.

[0073] Preferably, in this embodiment, the permeable holes are arranged in a quincunx pattern. A quincunx pattern arrangement of permeable holes can distribute the load and provide better crack resistance. Under the same conditions, permeable holes arranged in a quincunx pattern are less likely to cause roadbed deformation and settlement than permeable holes arranged in a rectangular pattern, thereby reducing the impact on the bearing capacity of the concrete roadbed.

[0074] S12. Calculate the actual effective area of ​​the concrete subgrade based on the porosity. In this step, the actual effective area is the actual area minus the pore area.

[0075] S13. Calculate the bearing capacity of the concrete subgrade based on the design strength of the concrete and the design load of the road section.

[0076] S14. Calculate the actual bearing capacity of the concrete subgrade based on the actual effective area and bearing capacity.

[0077] Specifically, for concrete subgrades affected by pores, the actual bearing capacity of the subgrade can be calculated using the limit equilibrium method based on the actual effective area and bearing capacity.

[0078] Preferably, the actual bearing capacity of the concrete subgrade is calculated using the following formula:

[0079] 1) P = (A hole ) / (A);

[0080] Where P is porosity, A hole The total area of ​​the holes is represented by A, where A is the area of ​​the roadbed.

[0081] 2) Aa = (1-P)*(A);

[0082] Where Aa is the actual effective area;

[0083] 3) Qa = Qd * (Aa / A);

[0084] Where Qa is the actual bearing capacity and Qd is the design bearing capacity.

[0085] S15. Compare the actual bearing capacity with the design bearing capacity to determine the impact of permeable holes on the bearing capacity of concrete subgrade.

[0086] S2. Lay the road base and compact it.

[0087] Specifically, in step S2, the road base layer is laid using lime-soil and graded crushed stone, covering the road surface and compacting it, with a compaction coefficient of not less than 0.9.

[0088] Preferably, the lime-soil mixture ratio is 12% quicklime + 88% plain soil.

[0089] S3. Lay permeable hole molds on the road base according to the hole spacing.

[0090] Specifically, the permeable hole mold includes multiple column molds, each corresponding to a specific location of a permeable hole. The height of each column mold is the same as the height of the concrete subgrade to be poured, and the diameter of each column mold is equal to the calculated diameter of the permeable hole. The tops of the multiple column molds are secured with positioning ribs to ensure that the permeable hole mold does not shift or tip over during subsequent concrete pouring.

[0091] S4. Pour concrete to form a concrete roadbed, and roughen the surface of the concrete roadbed.

[0092] Specifically, step S4 includes the following steps:

[0093] S41. Concrete is poured onto the road base after the permeable hole molds are laid. The pouring height of the concrete is equal to the height of the permeable hole molds, and the concrete is vibrated and compacted. In this embodiment, C20 strength concrete is preferably used for pouring.

[0094] S42. After the concrete has initially set, roughen the upper surface of the concrete by applying horizontal grooves. Optionally, an iron rake can be used for this step.

[0095] S43. Cover with film and water for curing, with a curing time of not less than 7 days, to form a concrete roadbed.

[0096] S44. After the concrete subgrade has cured, remove the permeable hole mold to form multiple columnar permeable holes in the concrete subgrade.

[0097] In this embodiment, the column mold is a PVC round hole mold, made of PVC polyvinyl chloride, and shaped as a straight cylindrical cylinder. The diameter of the cylinder is consistent with the calculated diameter of the permeable hole, and the height is consistent with the height of the concrete subgrade. The surface is smooth, and if necessary, a layer of release agent can be applied to the outer surface to facilitate removal after the concrete subgrade has cured.

[0098] S5. Prepare permeable concrete according to the permeability, pour the permeable concrete into each permeable hole on the concrete subgrade, and make the permeable concrete form a permeable concrete layer on the concrete subgrade.

[0099] Optionally, in step S5, the permeability of the permeable concrete is calculated using Darcy's law:

[0100] Q = K * I * A

[0101] Where Q is the water flow rate per unit time, in cubic meters per second; K is the permeability coefficient, in meters per second; I is the water pressure gradient, in Pascals per meter; and A is the cross-sectional area, in square meters.

[0102] Specifically, in step S5, according to the permeability requirements, the mix proportion of permeable concrete is as follows:

[0103] 1) Cement: 10%-15%,

[0104] 2) Coarse aggregate: 60%-70%,

[0105] 3) Fine aggregate: 20%-25%,

[0106] 4) Water: 12%-20% (add as needed based on the fluidity requirements of the concrete).

[0107] 5) Additives:

[0108] a. Permeable agent: 2%-4% (the ratio can be adjusted as needed),

[0109] b. Accelerator: The selection and adjustment should be based on the curing time and temperature of the concrete, with a typical ratio of 0.5%-1.5%.

[0110] It should be noted that in actual construction, the material ratio and additive proportion can be adjusted according to different design and performance requirements, and this embodiment does not limit them.

[0111] More specifically, before pouring permeable concrete, the concrete subgrade needs to be moistened with water, and surface dust, garbage, and other impurities that may affect the bonding between the two layers of concrete need to be washed away. During pouring, it must be ensured that all permeable holes are filled with permeable concrete. Finally, a membrane should be laid and watered for curing, with a curing time of no less than 7 days.

[0112] S6. Lay a permeable asphalt layer.

[0113] Specifically, following the conventional construction method for asphalt-stabilized drainage base courses, a permeable asphalt layer is laid on the permeable concrete layer completed in step S5, using a high-viscosity modified asphalt binder. Mechanical paving can be used, and the paving surface must be leveled and compacted using static pressure.

[0114] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method of constructing a pervious roadway, characterized by, Includes the following steps: S1. Calculate the road bearing capacity, permeability, and the diameter and spacing of the permeable holes; S2. Lay the road base layer and compact it; S3. A permeable hole mold is laid on the road base according to the hole spacing, and the permeable holes are arranged in a plum blossom-shaped array. S4. Pour concrete to form a concrete roadbed, and roughen the surface of the concrete roadbed. S5. Prepare permeable concrete according to the permeability, pour the permeable concrete into each permeable hole on the concrete subgrade, and make the permeable concrete form a permeable concrete layer on the concrete subgrade. S6. Lay a permeable asphalt layer; In step S1, the permeability is calculated using the following formula: Permeability = (Longitudinal cross-sectional area - Transverse cross-sectional area) / Longitudinal cross-sectional area; Longitudinal cross-sectional area = width * depth; Step S1 includes the following steps: S11. Calculate the density of the air pores per unit area, i.e., the porosity, based on the pore diameter and the spacing between the pores. S12. Calculate the actual effective area of ​​the concrete subgrade based on the porosity; S13. Calculate the bearing capacity of the concrete subgrade based on the design strength of the concrete and the design load of the road section; S14. Calculate the actual bearing capacity of the concrete subgrade based on the actual effective area and bearing capacity. S15. Compare the actual bearing capacity with the design bearing capacity to determine the impact of permeable holes on the bearing capacity of concrete subgrade. In step S11, the area of ​​the permeable holes is calculated using the following formula: ； Where Qd is the design bearing capacity, Qr is the existing load on the roadbed, Pc is the ratio of the hole area to the roadbed area, and C is the reduction factor of the hole on the roadbed bearing capacity. In step S11, the opening spacing of the permeable holes is calculated using the following formula: ； where P hole is the hole density, i.e. the ratio of the hole area to the pitch of the openings.

2. The pervious pavement construction method according to claim 1, characterized by, In step S1, the actual bearing capacity of the concrete subgrade is calculated using the following formula: 1） ； Where P is the porosity, A hole is the total area of the voids, and A is the area of the subgrade. 2） ； Where Aa is the actual effective area; 3） ； Where Qa is the actual bearing capacity and Qd is the design bearing capacity.

3. The permeable road construction method according to claim 1, characterized in that, In step S2, the road base is laid with lime-soil and graded crushed stone, covering the road surface and compacted, with a compaction coefficient of not less than 0.

9.

4. The permeable road construction method according to claim 1, characterized in that, The permeable hole mold includes multiple column molds whose positions correspond one-to-one with the permeable holes. The tops of the multiple column molds are fixed by positioning ribs. The height of the column molds is the same as the height of the concrete subgrade to be poured, and the diameter of the column molds is equal to the calculated diameter of the permeable holes.

5. The permeable road construction method according to claim 1, characterized in that, Step S4 specifically includes the following steps: S41. Pour concrete on the road base after laying the permeable hole mold, the pouring height of the concrete is equal to the height of the permeable hole mold, and vibrate the concrete to make it dense. S42. After the concrete has initially set, roughen the upper surface of the concrete by applying horizontal stripes. S43. Cover with film and water for curing, with a curing time of not less than 7 days, to form a concrete roadbed.

6. The permeable road construction method according to claim 1, characterized in that, In step S5, the permeability of the permeable concrete is calculated using Darcy's law: ； Where Q is the water flow rate per unit time, in cubic meters per second; K is the permeability coefficient, in meters per second; I is the water pressure gradient, in Pascals per meter; and A is the cross-sectional area, in square meters.

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