Road surface drainage system for ultrahigh and ultrahigh transition sections of wide road and setting method

Abstract

The invention discloses a road surface drainage system for ultrahigh and ultrahigh transition sections of a wide road and a setting method, and belongs to the technical field of road drainage engineering. The road surface drainage system comprises a middle lane drainage structure, a middle zoning drainage structure and a transverse drainage pipe; the transverse drainage pipes are located below the pavement cushion layer and perpendicular to the route direction of the road. The ends, away from the mid-division zone drainage structure, of the transverse drainage pipes are connected with embankment drainage ditches or urban pipe networks. The middle lane drainage structure is located between the pavement of the middle lane of the half-width road of the wide road and the transverse drainage pipe, and the lower portion of the middle lane drainage structure is communicated with the transverse drainage pipe. The drainage facility is arranged on the middle lane, a single long runoff path of the wide road surface is cut off, and the original drainage length of 4-5 lanes is converted into the drainage length of 2-3 lanes, so that the water accumulation condition of the hard shoulder of the middle division belt can be obviously relieved, the retention time of rainwater on the road surface is shortened, the drainage efficiency of the wide road surface is improved, and the drainage effect of the wide road surface is improved. The water film thickness caused by road surface runoff is reduced, and the driving safety in rainy days is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of road drainage engineering, and in particular to a road surface drainage system for superelevation and superelevation gradient sections of wide roads, and also to a method for setting up the road surface drainage system and a wide road paved with the road surface drainage system. Background Art

[0002] As time goes by, the highways built in the early stage gradually exposed problems such as insufficient traffic capacity and declining service level. Expanding the traditional two-way 4-lane and 6-lane highways to two-way 8-lane and 10-lane wide roads has become an inevitable choice to meet the needs of traffic development. After the expansion, the width of a single highway can reach 24m, and the catchment area and water flow path have increased by nearly one-fold, resulting in a longer time for surface water discharge and a surge in peak road runoff. In addition to the sharp increase in drainage pressure in general wide sections, drainage and safety issues in special sections are more prominent. The survey found that the superelevation and superelevation gentle sections of wide roads have become the key sections with drainage difficulties along the entire line due to the gentle composite slope and the change in the direction of the cross slope; meteorological data show that the warming of the climate system is still continuing, and the risk of extreme rainfall weather events will be further aggravated. When the rainfall intensity exceeds the drainage capacity of the wide road, the convergence of rainwater on the road surface is easy to form a water film, which reduces the adhesion performance of the vehicle tires and the road surface, causing the car to "hydroplaning", side slip and rollover to cause accidents, affecting driving safety. Therefore, how to improve the road surface drainage capacity and reduce the risk of driving on rainy days is a common problem faced in the reconstruction and expansion of wide roads.

[0003] Common improvement measures currently include: increasing the longitudinal and transverse slopes of the road, expanding the size of drainage facilities, setting up herringbone slopes, cutting grooves in the middle of the road, or placing transverse drainage ditches on the road surface. However, in practice, it was found that these measures were difficult to implement or had little effect due to the conditions of the super-elevated section and super-elevated gradient section of the reconstruction and expansion project and the limitations of cost factors, or changed the flatness of the road surface, thus affecting driving stability and comfort, and even reducing the life of the road.

[0004] In view of this, the inventor conducted in-depth research on this demand, and thus the present case was produced. Summary of the invention

[0005] In view of the problem that when improving the drainage capacity of wide roads in the prior art, under the conditions of the superelevation section and superelevation gradient section of the expansion project and the cost factors, common improvement measures are difficult to implement, have little effect, or change the road surface flatness, thereby affecting driving stability and comfort, and even reducing the life of the road, the present invention provides a road surface drainage system and setting method for superelevation and superelevation gradient sections of wide roads, shortening the road surface rainwater runoff path, so as to solve the problem of poor drainage of superelevation and superelevation gradient sections of wide roads, and improve driving safety in rainy days. The specific technical scheme is as follows:

[0006] A road surface drainage system for superelevation and superelevation gradient sections of a wide road, comprising a middle lane drainage structure, a median strip drainage structure, and a transverse drainage pipe;

[0007] The transverse drainage pipe is located below the pavement cushion layer and perpendicular to the route direction of the road. One end of the transverse drainage pipe away from the median drainage structure is connected to the drainage ditch of the embankment or the urban pipe network;

[0008] The middle lane drainage structure is located between the road surface of the middle lane of the half-width road surface of the wide road and the transverse drainage pipe, and its lower part is connected to the transverse drainage pipe;

[0009] The central dividing strip drainage structure is arranged on one side of the central dividing strip close to the guardrail, and its lower part is connected with the horizontal drainage pipe.

[0010] By adopting the above technical solution, drainage facilities are set in the middle lane to cut off the longer runoff path of a single wide road surface, and the original drainage length of a single 4-5 lane is converted into a drainage length of 2-3 lanes. This can significantly alleviate the water accumulation on the hard shoulder of the median strip and reduce the time that rainwater stays on the road surface, improve the drainage efficiency of wide roads, reduce the thickness of water film caused by surface runoff, and improve driving safety in rainy days.

[0011] According to one embodiment of the present invention, the middle lane drainage structure includes a permeable asphalt pavement, a modular drainage channel and a roadside water collection well;

[0012] The permeable asphalt pavement is laid on the upper layer of the densely distributed road surface, and its layer thickness is consistent with the upper layer of the road pavement structure on both sides;

[0013] The modular drainage channel is located at the position from the middle surface layer to the road base layer directly below the asphalt pavement, and the modular drainage channel is aligned with the side of the permeable asphalt pavement close to the central dividing strip;

[0014] The mid-road water collection well is located directly below the module drainage channel, and its bottom is connected to the transverse drainage pipe through a longitudinal connecting pipe.

[0015] By adopting the above technical scheme, the drainage structure of the middle lane is equipped with permeable asphalt pavement, modular drainage channels and roadside collection wells from top to bottom. Compared with the existing commonly used drainage improvement scheme of increasing the road line shape, the overall linear design of the expanded and reconstructed road is not changed. The permeable asphalt pavement is smoothly connected with the conventional dense pavement on both sides and is located in the pavement structure layer. No grooves are cut or dug on the road surface to ensure the flatness of the road surface, and driving stability and comfort are not affected.

[0016] According to one embodiment of the present invention, the median strip drainage structure includes a median strip longitudinal drainage ditch and a median strip water collection well, wherein the median strip longitudinal drainage ditch and the median strip water collection well are arranged vertically on one side of the central strip close to the guardrail;

[0017] One end of the transverse drainage pipe is connected to the well wall of the median water collection well away from the central dividing strip, and the other end is connected to the drainage ditch of the embankment or the urban pipe network.

[0018] By adopting the above technical scheme, the water in the center dividing strip can be discharged to the drainage ditch of the embankment or the urban pipe network through the longitudinal drainage ditch of the center dividing strip and the water collection well of the center dividing strip along one end of the transverse drainage pipe to realize drainage operation.

[0019] According to one embodiment of the present invention, the permeable asphalt pavement is located in the middle lane of the half-width road of the wide road, parallel to the road route, and smoothly connected with the dense pavement on both sides; its width is 3.5m-5.0m, and not less than the width of a lane. By limiting the minimum width of the permeable asphalt pavement, it is possible to prevent water from flowing away from the permeable asphalt pavement surface before it penetrates into the permeable asphalt pavement.

[0020] By adopting the above technical solution, the permeable asphalt pavement is located in the middle lane of the half-width road of the wide road, and the permeable asphalt pavement is only used in the middle lane, which reduces the expenditure on engineering materials and reduces the project cost; at the same time, the modular drainage channel has high strength and durability, which can support the upper side layer structure and reduce road damage during operation.

[0021] According to one embodiment of the present invention, the module drainage channel is arranged directly below the lane marking and on the corresponding road surface marking solid lane line, so as to avoid the wheel track position and reduce vehicle rolling.

[0022] According to one embodiment of the present invention, the modular drainage channel is assembled from internally hollowed-out PP water storage modules, the internal water storage space thereof can reach 95% of the total volume, and the compressive strength thereof is required to be greater than 0.3 MPa. Except for the bottom, the outer surface of the modular drainage channel is wrapped with anti-filtration geotextile.

[0023] The PP water storage module here is made of PP polypropylene plastic injection molding by the manufacturer and transported to the site for use. The unit size of the water storage module can be adjusted according to the design size. By designing its strength and internal water storage space, it can have good pressure resistance and drainage performance, and improve its service life. Compared with traditional gravel blind ditches, it can reduce resistance to water flow and occupancy of water storage space.

[0024] According to one embodiment of the present invention, the cross-sectional width and height of the module drainage channel meet the following conditions:

[0025]

[0026] In the formula: Qm is the drainage capacity of the module drainage channel, in m3 / s; n is the water resistance coefficient of the module drainage channel, which is 0.03-0.05; b is the cross-sectional width of the module drainage channel, in m; h is the cross-sectional height of the module drainage channel, in m; i is the longitudinal slope of the module drainage channel; Qs is the design flow rate.

[0027] According to another aspect of the present invention, an embodiment of the present application further provides a method for setting up the road surface drainage system for the superelevation and superelevation gradient section of the wide road, comprising:

[0028] If it is a new road construction, the location of the superelevation and superelevation gradient section shall be determined according to the design drawings, and the pavement drainage system coverage area of ​​the superelevation and superelevation gradient section of the wide road shall be clarified and marked; after the roadbed is completed, the horizontal drainage pipe reservation construction, the pavement subbase paving, the pouring of the road middle water collection well and the median water collection well, the installation of the modular drainage channel, the masonry of the median drainage ditch, the construction of the base and the middle and lower layers, the paving of the upper permeable asphalt pavement of the full section and the dense asphalt pavement on both sides shall be carried out in sequence;

[0029] If the construction is for road reconstruction and expansion, the position of the superelevation and superelevation gradient section shall be determined according to the design drawings, the coverage area of ​​the pavement drainage system of the superelevation and superelevation gradient section of the wide road shall be clarified and marked on the original road; the original road surface shall be milled, and the corresponding position of the pavement drainage system of the superelevation and superelevation gradient section of the wide road shall be excavated; the central strip drainage ditch and water collection well of the superelevation and superelevation gradient section of the original road shall be reconstructed; the transverse drainage pipes, mid-road water collection wells and modular drainage channels shall be installed and poured respectively; then the roadbed of the expanded part of the road shall be filled and the pavement base layer shall be paved; finally, the permeable asphalt pavement and dense asphalt pavement shall be paved on the entire section.

[0030] According to another aspect of the present invention, a wide road is further provided in an embodiment of the present application, having superelevation and superelevation gradient sections along its length direction, and the wide road is a wide road with more than 8 lanes in both directions, the superelevation and superelevation gradient sections are superelevation and superelevation gradient sections with high outer side and low inner side, and the road pavement structure includes a pavement surface layer, a base layer, a subbase layer and a cushion layer from top to bottom, and the pavement drainage system of the superelevation and superelevation gradient sections of the wide road is laid at all or part of the superelevation and superelevation gradient sections.

[0031] According to one embodiment of the present invention, the length of the modular drainage channel in the direction parallel to the road route is greater than or equal to 80% of the length of the superelevation and superelevation gradient section, and the longitudinal slope is consistent with the longitudinal slope of the road. The length of the modular drainage channel is designed to be greater than or equal to 80% of the length of the superelevation and superelevation gradient section, with a large coverage rate, so that it can play a good drainage effect on the road as a whole.

[0032] The beneficial effects produced by the technical solution of the present invention are as follows:

[0033] (1) By installing drainage facilities in the middle lane, the longer runoff path of a single lane of wide road can be cut off, and the original drainage length of a single lane of 4 to 5 lanes can be converted into the drainage length of 2 to 3 lanes. This can significantly alleviate the water accumulation on the hard shoulder of the median strip and reduce the time that rainwater stays on the road surface, improve the drainage efficiency of wide road surfaces, reduce the thickness of the water film caused by surface runoff, and improve driving safety in rainy days.

[0034] (2) The drainage system has a simple structure and is located in the pavement structure layer. No grooves or trenches are cut on the road surface to ensure the smoothness of the road surface, and driving stability and comfort are not affected. Compared with the existing drainage improvement scheme that increases the road line shape, the present invention does not change the overall line shape design of the expanded road.

[0035] (3) Compared with paving the entire line with drainage asphalt pavement, permeable asphalt pavement is used only in the middle lane, which reduces the expenditure on engineering materials and reduces the construction cost; at the same time, the modular drainage channel of the present invention has high strength and durability, can support the upper side layer structure, and reduce road damage during operation;

[0036] (4) The drainage system is simple to construct and does not require special processes. It adopts a modular design, and each module can be installed and disassembled separately, making the construction process simple and quick, and also convenient for later maintenance and repair. The modular design also takes into account space utilization efficiency and flexibility. Modules of uniform size can be freely combined according to actual needs to form drainage channels of different shapes and sizes. This design not only simplifies the construction process and improves construction efficiency, but also allows the drainage channels to be cleaned and reused in the later stages of use. After the service life is reached, they can be directly dismantled, replaced with new materials, and reassembled, which is simple to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a schematic diagram of the planar structure of the present invention;

[0039] Figure 2 The present invention Figure 1 Schematic cross-sectional view of the middle BB section;

[0040] Figure 3 It is a partial cross-sectional schematic diagram of the present invention;

[0041] Figure 4 It is a schematic diagram of the splicing of the module drainage channel in the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] The road drainage system of the present invention can be used on highways and urban roads. The present invention is described by taking highways as an example. Figure 1-3 As shown, the present invention provides a road surface drainage system for superelevation and superelevation gradient sections of wide roads, including a middle lane drainage structure 1, a median strip drainage structure 2, a transverse drainage pipe 3 and a rapids trough 4;

[0044] The rapid flow trough 4 is embedded in the embankment slope, the top end of which is connected to the transverse drainage pipe 3, and the bottom end is connected to the drainage ditch 5 under the embankment. The transverse drainage pipe 3 is located below the pavement cushion layer and is perpendicular to the route direction of the highway.

[0045] The middle lane drainage structure 1 is located between the road surface of the middle lane of the half-width road surface of the wide highway and the transverse drainage pipe 3, and its lower part is connected with the transverse drainage pipe 3;

[0046] The median strip drainage structure 2 is arranged on one side of the central dividing strip 6, close to the guardrail, and the bottom thereof is connected to the transverse drainage pipe 3. By arranging drainage facilities in the middle lane, the longer runoff path of the wide road surface is cut off, and the original drainage length of the single lane of 4-5 lanes is converted into the drainage length of 2-3 lanes, which can significantly alleviate the water accumulation on the hard shoulder of the median strip and reduce the time that rainwater stays on the road surface, improve the drainage efficiency of the wide road surface, reduce the water film thickness caused by the road surface runoff, and improve the driving safety in rainy days.

[0047] As a preferred embodiment, the structure of the middle lane drainage structure 1 is further introduced here, which includes a permeable asphalt pavement 11, a modular drainage channel 12 and a road water collection well 13;

[0048] The permeable asphalt pavement 11 is laid on the upper layer of the densely distributed pavement, and its layer thickness is consistent with the upper layer of the road pavement structure on both sides;

[0049] The modular drainage channel 12 is located at the position between the middle surface layer and the road base layer directly below the asphalt pavement 11, and the modular drainage channel 12 is aligned with the side of the permeable asphalt pavement 11 close to the central dividing strip 6;

[0050] The water collection well 13 in the road is located directly below the module drainage channel 12, and its bottom is connected to the transverse drainage pipe 3 through the longitudinal connecting pipe 14. The drainage structure of the middle lane is sequentially provided with permeable asphalt pavement, module drainage channel and water collection well in the road from top to bottom. Compared with the existing drainage improvement scheme of increasing the road line shape, the overall linear design of the expanded highway is not changed. The two sides of the permeable asphalt pavement are smoothly connected with the conventional dense pavement, located in the pavement structure layer, and no grooves are cut or dug on the road surface to ensure the flatness of the road surface, which does not affect the driving stability and comfort.

[0051] As a preferred embodiment, the central strip drainage structure 2 includes a central strip longitudinal drainage ditch 21 and a central strip water collection well 22, wherein the central strip longitudinal drainage ditch 21 and the central strip water collection well 22 are arranged on one side of the central strip 6 close to the guardrail position;

[0052] One end of the transverse drainage pipe 3 is connected to the well wall of the center dividing strip 22 away from the side of the central dividing strip 6, and the other end extends to the road slope and is connected with the rapids trough 4. In this way, the water in the center dividing strip can be discharged through the center dividing strip longitudinal drainage ditch, the center dividing strip water collection well and one end of the transverse drainage pipe to the rapids trough on the road slope, thereby realizing drainage operation.

[0053] Permeable asphalt pavement 11 is located in the middle lane of the half-width road of the wide highway, parallel to the direction of the highway route, and smoothly connected with the dense pavement on both sides; its width is 3.5m-5.0m, and not less than the width of one lane. The permeable asphalt pavement is used in the middle lane of the half-width road of the wide highway, and only the permeable asphalt pavement is used in the middle lane, which can reduce the expenditure of engineering materials and reduce the cost of the project; at the same time, the modular drainage channel has high strength and durability, which can support the upper side layer structure and reduce road damage during operation.

[0054] The module drainage channel 12 is arranged directly below the lane marking and on the corresponding road surface marking solid lane line, so as to avoid the wheel track position and reduce vehicle rolling.

[0055] like Figure 4 As shown, the modular drainage channel 12 is assembled by splicing edges 122 with hollowed-out PP water storage modules 121. The outer surface of the modular drainage channel 12 is wrapped with anti-filter geotextile except the bottom. Its internal water storage space can reach 95% of the total volume, and its compressive strength is required to be greater than 0.3MPa. The PP water storage module here is made of PP polypropylene plastic injection molding by the manufacturer and transported to the highway site for use. The unit size of the water storage module can be adjusted according to the design size. By designing its strength and internal water storage space, it can have good compressive resistance and drainage performance, and improve its service life. Compared with traditional gravel blind ditches, it can reduce the resistance to water flow and the occupation of water storage space.

[0056] It should be noted that the surface of the PP water storage module 121 is a mesh structure, and a mortise and tenon structure can be set at the intersection of the mesh structure, so that two adjacent PP water storage modules 121 can be directly plugged and assembled through the mortise and tenon structure. In addition, multiple PP water storage modules 121 can also be connected into a whole by using a buckle or other structure.

[0057] The structure of the PP water storage module 121 belongs to the prior art, and the specific structure can refer to the Chinese utility model patent with authorization announcement number CN205348273U.

[0058] Specifically, the cross-sectional width and height of the module drainage channel 12 meet the following conditions:

[0059]

[0060] In the formula: Qm is the drainage capacity of the module drainage channel, in m3 / s; n is the water resistance coefficient of the module drainage channel, which is 0.03-0.05; b is the cross-sectional width of the module drainage channel, in m; h is the cross-sectional height of the module drainage channel, in m; i is the longitudinal slope of the module drainage channel; Qs is the design flow rate.

[0061] Here, the present application also provides a method for setting up the road surface drainage system of the above-mentioned wide road superelevation and superelevation gradient section, including:

[0062] If it is a new road construction, the location of the superelevation and superelevation gradient section shall be determined according to the design drawings, and the pavement drainage system coverage area of ​​the superelevation and superelevation gradient section of the wide road shall be clearly defined and marked; after the roadbed is completed, the horizontal drainage pipe reservation construction, the pavement subbase paving, the pouring of the road middle water collection well and the median water collection well, the installation of the modular drainage channel, the masonry of the median drainage ditch, the construction of the base and the middle and lower layers, the paving of the upper permeable asphalt pavement of the full section and the dense asphalt pavement on both sides shall be carried out in sequence;

[0063] If the construction is for road reconstruction and expansion, the location of the superelevation and superelevation gradient section shall be determined according to the design drawings, the coverage area of ​​the pavement drainage system of the superelevation and superelevation gradient section of the wide road shall be clarified and marked on the original road; the original road surface shall be milled, and excavation shall be carried out at the corresponding position of the pavement drainage system of the superelevation and superelevation gradient section of the wide road; the central strip drainage ditch and water collection well of the superelevation and superelevation gradient section of the original road shall be renovated; the transverse drainage pipes, mid-road water collection wells and modular drainage channels shall be installed and poured respectively; then the roadbed of the expanded part of the road shall be filled and the pavement base layer shall be paved; finally, the permeable asphalt pavement and dense asphalt pavement shall be paved on the entire section.

[0064] The present application also provides a wide highway having superelevation and superelevation gradient sections along its length direction, and the wide highway is a wide highway with more than 8 lanes in both directions, and the superelevation and superelevation gradient sections are superelevation and superelevation gradient sections with high outer sides and low inner sides, see Figure 3 The highway pavement structure 100 includes a pavement surface layer 101, a base layer 102, a subbase layer 103 and a cushion layer 104 from top to bottom, and the pavement drainage system of the superelevation and superelevation gradient section of the wide road is laid at all or part of the superelevation and superelevation gradient section.

[0065] Preferably, the length of the modular drainage channel 12 in the direction parallel to the highway route is greater than or equal to 80% of the length of the superelevation and superelevation gradient section, and the longitudinal slope is consistent with the longitudinal slope of the road. The length of the modular drainage channel is designed to be greater than or equal to 80% of the length of the superelevation and superelevation gradient section, with a large coverage rate, so that it can play a good drainage effect on the highway as a whole.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A road drainage system for superelevation and superelevation gradient sections of wide roads, characterized in that: It includes the middle lane drainage structure, median strip drainage structure, and transverse drainage pipes; The transverse drainage pipe is located below the pavement cushion layer and perpendicular to the route direction of the road. One end of the transverse drainage pipe away from the median drainage structure is connected to the drainage ditch of the embankment or the urban pipe network; The middle lane drainage structure is located between the road surface of the middle lane of the half-width road surface of the wide road and the transverse drainage pipe, and its lower part is connected with the transverse drainage pipe; The central dividing strip drainage structure is arranged on one side of the central dividing strip close to the guardrail, and its lower part is connected with the horizontal drainage pipe.

2. The road surface drainage system for superelevation and superelevation gradient section of wide road according to claim 1 is characterized in that: The middle lane drainage structure includes permeable asphalt pavement, modular drainage channels and a roadside water collection well; The permeable asphalt pavement is laid on the upper layer of the densely distributed road surface, and its layer thickness is consistent with the upper layer of the road pavement structure on both sides; The modular drainage channel is located at the position from the middle surface layer to the road base layer directly below the asphalt pavement, and the modular drainage channel is aligned with the side of the permeable asphalt pavement close to the central dividing strip; The mid-road water collection well is located directly below the module drainage channel, and its bottom is connected to the transverse drainage pipe through a longitudinal connecting pipe.

3. The road surface drainage system for superelevation and superelevation gradient section of wide road according to claim 2 is characterized in that: The drainage structure of the central dividing strip includes a longitudinal drainage ditch of the central dividing strip and a water collection well of the central dividing strip, wherein the longitudinal drainage ditch of the central dividing strip and the water collection well of the central dividing strip are arranged vertically on one side of the central dividing strip and close to the guardrail; One end of the transverse drainage pipe is connected to the well wall of the median water collection well away from the central dividing strip, and the other end is connected to the drainage ditch of the embankment or the urban pipe network.

4. The road surface drainage system for superelevation and superelevation gradient section of wide road according to claim 2 is characterized in that: The permeable asphalt pavement is located in the middle lane of the half-width road of the wide road, parallel to the road route, smoothly connected with the dense pavement on both sides, and not less than the width of one lane.

5. The road surface drainage system for superelevation and superelevation gradient section of wide road according to claim 2 is characterized in that: The module drainage channel is arranged directly below the lane marking and corresponds to the solid lane marking on the road surface.

6. The road surface drainage system for superelevation and superelevation gradient section of wide road according to claim 2 is characterized in that: The module drainage channel includes a plurality of internally hollowed-out PP water storage modules assembled with each other, and the outer surface of the module drainage channel except the bottom is wrapped with anti-filtration geotextile.

7. The road surface drainage system for superelevation and superelevation gradient section of wide road according to claim 2 is characterized in that: The cross-sectional width and height of the module drainage channel meet the following conditions: Where: Q m is the drainage capacity of the module drainage channel, in m 3 / s; n is the water resistance coefficient of the module drainage channel, which is 0.03-0.05; b is the cross-sectional width of the module drainage channel, in m; h is the cross-sectional height of the module drainage channel, in m; i is the longitudinal slope of the module drainage channel; Q s Design flow rate.

8. A method for setting up a road surface drainage system for superelevation and superelevation gradient sections of a wide road as claimed in claim 3, characterized in that: include: If it is a new road construction, the location of the superelevation and superelevation gradient section shall be determined according to the design drawings, and the pavement drainage system coverage area of ​​the superelevation and superelevation gradient section of the wide road shall be clarified and marked; after the roadbed is completed, the horizontal drainage pipe reservation construction, the pavement subbase paving, the pouring of the road middle water collection well and the median water collection well, the installation of the modular drainage channel, the masonry of the median drainage ditch, the construction of the base and the middle and lower layers, the paving of the upper permeable asphalt pavement of the full section and the dense asphalt pavement on both sides shall be carried out in sequence; If the road is to be rebuilt or expanded, the location of the superelevation and superelevation gradient sections shall be determined according to the design drawings, the road surface drainage system coverage area of ​​the superelevation and superelevation gradient sections of the wide road shall be clearly defined and marked on the original road; The original road surface is milled and excavated at the corresponding positions of the road surface drainage system in the superelevation and superelevation gradient section of the wide road; the drainage ditches and water collection wells in the superelevation and superelevation gradient section of the original road are reconstructed; The installation and pouring of transverse drainage pipes, roadside water collection wells and modular drainage channels were carried out respectively; then the roadbed of the expanded road was filled and the pavement base was paved; finally, the permeable asphalt pavement and dense asphalt pavement were paved on the entire section.

9. A wide road, characterized in that: It has superelevation and superelevation gradient sections along its length, and the wide road is a wide road with more than 8 lanes in both directions, the superelevation and superelevation gradient sections are superelevation and superelevation gradient sections with high outer sides and low inner sides, the road pavement structure includes a pavement surface layer, a base layer, a subbase layer and a cushion layer from top to bottom, and the pavement drainage system of the superelevation and superelevation gradient sections of the wide road as described in any one of claims 1 to 7 is laid at all or part of the superelevation and superelevation gradient sections.

10. The wide road according to claim 9, characterized in that: The length of the modular drainage channel in the direction parallel to the road alignment is greater than or equal to 80% of the length of the superelevation and superelevation gradient section, and the longitudinal slope is consistent with the longitudinal slope of the road.

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