A shoulder wall with drainage function for embankment section pavement overlay reconstruction project

Abstract

The application discloses a road shoulder wall with drainage function for embankment section pavement overlay reconstruction engineering, relates to the technical field of highway retaining, and solves the problem that the existing road shoulder wall influences internal drainage of a pavement structure, guarantees that internal water accumulation of a pavement structure layer is drained smoothly, and the specific scheme is as follows: the road shoulder wall adopts a stepped base, is arranged on the top surface of a roadbed and the adjacent side of a pavement structure layer, and is used for providing lateral support for the pavement structure layer, and comprises a wall body, a foundation and a cushion layer arranged in sequence from top to bottom, the overall height of the road shoulder wall is the same as the thickness of the pavement structure layer, the wall body comprises an external partition layer, a drainage layer and a bottom partition layer arranged in sequence from top to bottom, the top surface of the external partition layer is provided with a transverse slope and is connected with the top surface of the pavement structure layer, and a curb is arranged between the external partition layer and the pavement structure layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of highway retaining technology, in particular to a road shoulder wall with drainage function for embankment section pavement overlay reconstruction project. BACKGROUND

[0002] The pavement is a direct carrier for vehicle traffic, and each region has clear requirements for the technical condition of the asphalt pavement of the managed highway. In order to meet the corresponding requirements, special maintenance and repair is required for the asphalt pavement with poor technical condition to improve the technical condition of the asphalt pavement and improve the road service level. The pavement overlay reinforcement scheme is a common maintenance and repair scheme.

[0003] However, the pavement structure of the embankment section needs to be overlaid and lifted, and the soil shoulder and the embankment slope on the roadside need to be lifted accordingly. According to the traditional embankment slope grading scheme, new land occupation is required, and the original protection project of the embankment slope will be abandoned. Due to the strict land protection policy, there are great difficulties in land acquisition, and the implementation of the traditional embankment slope grading scheme is more and more limited.

[0004] In addition, the asphalt pavement has a certain void ratio, and the surface water will seep into the internal structure of the asphalt pavement through the voids. The seepage water mainly gathers in the asphalt concrete layer. In order to avoid water damage to the asphalt pavement, the internal water of the pavement structure needs to be discharged in time and effectively. The commonly used internal drainage scheme of the pavement structure is to set longitudinal porous cement gravel infiltration ditches at the edge of the asphalt pavement to collect the water in the internal structure of the pavement, and then discharge the water collected by the longitudinal infiltration ditches through the horizontal drainage pipe.

[0005] As described above, in the case of limited land use, the road shoulder wall can be set at the edge of the pavement to realize the support of the pavement structure and avoid the new land occupation caused by the embankment slope grading. However, the setting position of the road shoulder wall conflicts with the position of the conventional internal drainage facility of the pavement structure, and the conventional cement concrete has poor water permeability, which will cause poor drainage of the internal water of the pavement structure. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application provides a road shoulder wall with drainage function for embankment section pavement overlay reconstruction project. The road shoulder wall provides lateral support for the pavement structure layer, fully utilizes the retaining effect of the road shoulder wall on the pavement, improves the overall stability of the pavement structure, avoids the new land occupation caused by the embankment slope grading during the pavement overlay reconstruction, and realizes the drainage of the internal water of the pavement structure layer through the drainage layer of the road shoulder wall, thereby solving the problem that the existing road shoulder wall is not convenient for the drainage of the internal water of the pavement structure.

[0007] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0008] The application provides a shoulder wall with drainage function for embankment section pavement overlay reconstruction engineering.

[0009] As a further implementation manner, the wall body is provided with a plurality of settlement expansion joints, and the settlement expansion joints are filled with asphalt reinforcement.

[0010] As a further implementation manner, the pavement structure layer comprises, from top to bottom, an asphalt concrete surface layer, a large-particle-size water-permeable asphalt concrete flexible base layer, a semi-rigid upper base layer, a semi-rigid lower base layer and a semi-rigid bottom base layer, a curb is arranged between the asphalt concrete surface layer and the wall body, and the semi-rigid upper base layer, the semi-rigid lower base layer and the semi-rigid bottom base layer combine to form a stepped structure.

[0011] As a further implementation manner, the cushion layer is located at one side of the semi-rigid bottom base layer and has the same height as the semi-rigid bottom base layer, and the cushion layer and the semi-rigid bottom base layer jointly support the foundation, and the top surface of the cushion layer is horizontal and has no transverse slope.

[0012] As a further implementation manner, the foundation is located at one side of the semi-rigid lower base layer and has the same height as the semi-rigid lower base layer, and one side of the cushion layer exceeds the edge of the foundation.

[0013] As a further implementation manner, the semi-rigid lower base layer and the foundation jointly support the wall body, one side of the foundation exceeds the edge of the wall body to form a wall toe, and the top surface of the wall toe is provided with a transverse slope.

[0014] As a further implementation manner, the top surface of the wall toe is connected with the top surface of the roadbed slope in sequence, and the top surface of the roadbed slope is provided with a transverse slope and has a slope greater than that of the wall toe.

[0015] As a further implementation manner, the bottom partition layer is arranged above the semi-rigid lower base layer and the foundation, and the bottom partition layer is provided with a transverse slope.

[0016] As a further implementation manner, the drainage layer is a water-permeable cement concrete structure for draining internal water in the pavement structure layer to the outside; the outer partition layer and the bottom partition layer are both made of cement concrete, the outer partition layer is used for preventing road surface runoff and direct precipitation in the natural world from penetrating into the drainage layer, and the bottom partition layer is used for preventing the internal water drained from the pavement structure layer from penetrating downward from the drainage layer to the lower part of the pavement structure layer.

[0017] As a further implementation manner, the curb is any one of a flat curb and a vertical curb.

[0018] The beneficial effects of the present application are as follows:

[0019] (1) The shoulder wall of the present application has small disturbance to the original roadbed slope, the protection facilities of the original roadbed slope can be basically completely retained and utilized, waste engineering is reduced, the shoulder wall provides lateral support for the pavement structure layer, the retaining effect of the shoulder wall on the pavement is fully utilized, the overall stability of the pavement structure is improved, newly occupied land caused by the roadbed slope in the pavement overlay reconstruction process is avoided, the internal water accumulation of the pavement structure layer is drained through the drainage layer of the shoulder wall, the construction process is simple, and the construction period is shortened.

[0020] (2) The shoulder wall of the present application adopts a stepped base, the stability of the wall body can be increased, the vertical support effect provided by the semi-rigid lower base layer and the semi-rigid bottom base layer can be fully utilized, the pouring amount of cement concrete of the shoulder wall is reduced, and the economy is saved.

[0021] (3) The setting of the wall toe increases the anti-sliding stability and the anti-overturning stability of the overall shoulder wall, and can withstand the long-term scouring effect caused by the internal water accumulation of the pavement after being drained from the drainage layer.

[0022] (4) The drainage layer of the present application has a self-draining function, can simultaneously replace the internal drainage system of the conventional pavement edge, simplifies the construction process, cooperates with the setting of the external partition layer and the bottom partition layer, can effectively prevent the road surface runoff and the direct precipitation of the natural world from penetrating into the drainage layer, ensures the durability of the pervious concrete, and prevents the internal water accumulation of the pavement structure layer from penetrating into the lower part of the pavement structure layer from the pervious asphalt concrete area, and ensures the effective drainage of the drainage layer. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and the explanation thereof serve to explain the present application, and do not constitute an improper limitation of the present application.

[0024] Figure 1 is a front view structural schematic diagram of a self-draining function shoulder wall for roadbed section pavement overlay reconstruction engineering according to one or more embodiments of the present application (containing a flat curb);

[0025] Figure 2 is a front view structural schematic diagram of a self-draining function shoulder wall for roadbed section pavement overlay reconstruction engineering according to one or more embodiments of the present application (containing a flat curb);

[0026] Figure 3is a side view structural schematic diagram of a road shoulder wall with drainage function for embankment section pavement overlay reconstruction project according to one or more embodiments of the present application (containing a curb);

[0027] Figure 4 is a structural dimension marked schematic diagram of a road shoulder wall with drainage function for embankment section pavement overlay reconstruction project according to one or more embodiments of the present application;

[0028] Figure 5 is a front view structural schematic diagram of another road shoulder wall with drainage function for embankment section pavement overlay reconstruction project according to one or more embodiments of the present application (containing a vertical curb);

[0029] Figure 6 is a top view structural schematic diagram of another road shoulder wall with drainage function for embankment section pavement overlay reconstruction project according to one or more embodiments of the present application (containing a vertical curb);

[0030] Figure 7 is a side view structural schematic diagram of another road shoulder wall with drainage function for embankment section pavement overlay reconstruction project according to one or more embodiments of the present application (containing a vertical curb);

[0031] In the figure, the mutual distance or size is exaggerated for showing the position of each part, and the schematic diagram is only for illustration;

[0032] 1, wall body; 1-1, outer partition layer; 1-2, drainage layer; 1-3, bottom partition layer; 2, foundation; 2-1, wall toe; 2-2, base; 3, settlement expansion joint; 4, cushion; 5, pavement structure layer; 5-1, asphalt concrete surface layer; 5-2, large particle size permeable asphalt concrete flexible base layer; 5-3, semi-rigid upper base layer; 5-4, semi-rigid lower base layer; 5-5, semi-rigid bottom base layer; 6, roadbed top surface; 7, roadbed slope top surface; 8, curb; 9, vertical curb;

[0033] B1, road shoulder wall body width; B2, wall toe width; B3, width of cushion beyond the edge of foundation; B4, width of semi-rigid lower base layer edge beyond the edge of semi-rigid upper base layer; B5, width of semi-rigid bottom base layer edge beyond the edge of semi-rigid lower base layer;

[0034] H1, pavement structure layer thickness; H2, road shoulder wall height; H3, wall body height; H4, outer partition layer thickness; H5, drainage layer thickness; H6, bottom partition layer thickness; H7, foundation thickness; H8, cushion thickness. DETAILED DESCRIPTION

[0035] It should be noted that the following detailed description is illustrative only, and is intended to further explain the present application. All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application pertains, unless otherwise specifically defined herein.

[0036] As introduced in the background, in the case of limited land use, a shoulder wall can be set at the edge of the road surface to realize the support of the road surface structure, avoid the occupation of land by the roadbed slope, but the setting position of the shoulder wall conflicts with the position of the internal drainage facility of the conventional road surface structure, and since the shoulder wall is usually made of cement concrete, the conventional cement concrete has poor water permeability, which can cause the problem of poor drainage of water in the internal road surface structure. In order to solve the above technical problems, the present application provides a shoulder wall with drainage function for embankment section road surface overlay reconstruction project.

[0037] Embodiment background: The road surface structure layer of a certain national road in the eastern region is: 9cm asphalt concrete surface layer + 16cm semi-rigid upper base layer + 16cm semi-rigid lower base layer + 15cm semi-rigid bottom base layer, and the total thickness of the road surface structure layer is 56cm. Since the national road has been in service for a long time, the construction standard is low, and the current road surface technical condition index is poor, the excellent road surface technical condition index rate is much smaller than the target value of 88%, and cannot meet the management target requirements.

[0038] According to the previous road surface disease detection data, the base layer and the bottom base layer have been damaged on a large scale, the road surface structure strength is insufficient, and the road surface maintenance scheme adopted is: after all the original road surface structure layers are milled, 18cm asphalt concrete surface layer 5-1 + 12cm large particle size water permeable asphalt concrete flexible base layer 5-2 + 18cm semi-rigid upper base layer 5-3 + 18cm semi-rigid lower base layer 5-4 + 18cm semi-rigid bottom base layer 5-5 are newly paved, the thickness H1 of the newly built road surface structure layer 5 is 84cm, and the top elevation of the newly built road surface is lifted by 28cm compared with the top elevation of the original road surface. The edge of the newly built semi-rigid lower base layer 5-4 is wider than the edge of the semi-rigid upper base layer 5-3 by B4, and B4 is generally 20cm, and the edge of the newly built semi-rigid bottom base layer 5-5 is wider than the edge of the semi-rigid lower base layer 5-4 by B5, and B5 is generally 20cm.

[0039] Embodiment 1

[0040] In a typical embodiment of the present application, as Figures 1-4As shown, a shoulder wall with drainage function for embankment section pavement overlay reconstruction project is proposed, which is arranged on the top surface 6 of the roadbed, adjacent to the pavement structure layer 5, and provides lateral support for the pavement structure layer 5, including a wall body 1, a foundation 2, a settlement expansion joint 3 and a cushion layer 4. The overall height H2 of the shoulder wall is the same as the thickness H1 of the pavement structure layer 5. The settlement expansion joint 3 is arranged on the wall body 1, and one is arranged every L along the longitudinal direction of the shoulder wall. L is generally 10 m, and the joint width of the settlement expansion joint 3 is 2 cm, and the joint is filled with asphalt reinforcement.

[0041] The pavement structure layer 5 is sequentially arranged from top to bottom as an asphalt concrete surface layer 5-1, a large-particle-size permeable asphalt concrete flexible base layer 5-2, a semi-rigid upper base layer 5-3, a semi-rigid lower base layer 5-4 and a semi-rigid bottom base layer 5-5.

[0042] The asphalt concrete surface layer 5-1 is provided with a curb between the wall body, and the width of the asphalt concrete surface layer 5-1 and the width of the curb are the same as the width of the large-particle-size permeable asphalt concrete flexible base layer 5-2 and the semi-rigid upper base layer 5-3. The width of the large-particle-size permeable asphalt concrete flexible base layer 5-2 is equal to the width of the semi-rigid upper base layer 5-3.

[0043] The width of the semi-rigid upper base layer 5-3, the semi-rigid lower base layer 5-4 and the semi-rigid bottom base layer 5-5 increases in turn to form a stepped structure, that is, the width of the semi-rigid upper base layer 5-3 is less than the width of the semi-rigid lower base layer 5-4, and the width of the semi-rigid lower base layer 5-4 is less than the width of the semi-rigid bottom base layer 5-5.

[0044] The cushion layer 4 is located on one side of the semi-rigid bottom base layer 5-5, and the height of the cushion layer 4 is the same as that of the semi-rigid bottom base layer 5-5. The foundation 2 is located on one side of the semi-rigid lower base layer 5-4, and the height of the foundation 2 is the same as that of the semi-rigid lower base layer 5-4.

[0045] The cushion layer 4 is a graded crushed stone cushion layer, and the width of the cushion layer 4 beyond the edge of the foundation 2 is B3, which is generally not less than 20 cm. The top surface of the cushion layer 4 is horizontal and has no cross slope to ensure the overall stability of the shoulder wall.

[0046] The foundation 2 is cast in situ with cement concrete material, and is arranged on the cushion layer 4 and the semi-rigid bottom base layer 5-5, below the wall body 1, adjacent to the semi-rigid lower base layer 5-4 of the pavement. Specifically, the foundation 2 is located above the cushion layer 4, one side of the foundation 2 is overlapped on the side of the semi-rigid bottom base layer 5-5 extending beyond the edge of the semi-rigid lower base layer 5-4, and the other side of the foundation 2 is placed on the cushion layer 4, so as to support the foundation 2 together with the semi-rigid bottom base layer 5-5 and the cushion layer 4. The side of the cushion layer 4 away from the semi-rigid bottom base layer 5-5 extends beyond the foundation 2, and the cushion layer 4 and the foundation 2 form a stepped structure in combination.

[0047] The thickness H7 of the foundation 2 is the same as the thickness of the semi-rigid subbase 5-4, and the shoulder wall uses a stepped base 2-2, which can increase the stability of the wall body 1, fully utilize the vertical support provided by the semi-rigid subbase 5-4 and the semi-rigid bottom base 5-5, reduce the pouring amount of the cement concrete of the shoulder wall, and save the economy.

[0048] The part of the foundation 2 that extends outward beyond the edge of the wall body 1 is referred to as a wall toe 2-1, and the width B2 of the wall toe 2-1 is generally not less than 20 cm. The top surface of the wall toe 2-1 is provided with a horizontal slope of 2%, which can ensure that the water discharged from the drainage layer 1-2 is promptly drained from the top surface of the wall toe 2-1.

[0049] The wall toe 2-1 not only increases the overall anti-sliding stability and anti-overturning stability of the shoulder wall, but also can withstand the long-term erosion caused by the water accumulated in the pavement and discharged from the drainage layer 1-2.

[0050] The wall body 1 is arranged above the foundation 2, one side of the wall body 1 is overlapped on the side of the semi-rigid subbase 5-4 that extends beyond the edge of the semi-rigid upper base 5-3, and the other side of the wall body 1 is placed on the foundation 2. The wall body 1 is supported by the semi-rigid subbase 5-4 and the foundation 2, and the foundation 2 and the wall body 1 form a stepped structure.

[0051] The wall body 1 is composed of an external partition layer 1-1, a drainage layer 1-2, and a bottom partition layer 1-3 from top to bottom. The overall width B1 of the wall body 1 of the shoulder wall is generally 55 cm. The external partition layer 1-1 is cast in place using cement concrete material, and the thickness H4 of the external partition layer 1-1 is generally 10 cm.

[0052] One side of the bottom partition layer 1-3 is overlapped on the side of the semi-rigid subbase 5-4 that extends beyond the edge of the semi-rigid upper base 5-3, and the other side of the bottom partition layer 1-3 is placed on the foundation 2. The drainage layer 1-2 is arranged directly above the bottom partition layer 1-3, and the external partition layer 1-1 is arranged directly above the drainage layer 1-2.

[0053] The bottom partition layer 1-3 is cast in place using cement concrete material, and the thickness H6 of the bottom partition layer 1-3 is generally 10 cm. The bottom partition layer 1-3 prevents the water accumulated in the pavement structure layer 5 from seeping downward from the permeable asphalt concrete area to the lower part of the pavement structure layer 5. The bottom partition layer 1-3 is provided with a horizontal slope of 2%, which ensures that the water accumulated in the pavement structure is promptly drained outward from the drainage layer 1-2.

[0054] It can be understood that the bottom partition layer 1-3 and the foundation 2 can be integrally cast in place using cement concrete, which is simple in process and high in construction efficiency.

[0055] Drainage layer 1-2 is made of permeable cement concrete and cast in place. Water accumulated inside the pavement structure layer 5 can be directly discharged to the outside of the pavement through the permeable cement concrete area. The bottom surface of drainage layer 1-2 should be lower than the bottom surface of asphalt concrete surface layer 5-1 to ensure that all water accumulated inside the pavement can be discharged from the shoulder wall drainage layer 1-2. The setting of drainage layer 1-2 makes the shoulder wall have its own drainage function, which can simultaneously replace the conventional pavement edge internal drainage system, simplify the construction process, and effectively shorten the construction period.

[0056] Specifically, the top surface of the drainage layer 1-2 is higher than the bottom surface of the asphalt concrete surface layer 5-1, and the bottom surface of the drainage layer 1-2 is lower than the bottom surface of the large-particle-size permeable asphalt concrete flexible base layer 5-2, so as to facilitate the drainage of infiltrated water.

[0057] The cross slope of the top surface of the external partition layer 1-1 is set to 2%. The top surface of the external partition layer 1-1 is connected to the top surface of the asphalt concrete surface layer 5-1. That is, the overall cross slope of the top surfaces of the external partition layer 1-1 and the asphalt concrete surface layer 5-1 is set to 2% to ensure that the water on the asphalt concrete surface layer 5-1 and the external partition layer 1-1 is drained away in time.

[0058] Shoulder walls are used in road sections with dispersed surface runoff (such as...) Figure 1 As shown, surface runoff and natural precipitation will drain from the top surface of the external isolation layer 1-1 to the roadside. At this time, the curb between the external isolation layer 1-1 and the asphalt concrete surface layer 5-1 is a flat curb 8. The function of the external isolation layer 1-1 is to prevent surface runoff and natural precipitation from seeping into the permeable concrete area inside the shoulder wall. Especially in winter, the external isolation layer 1-1 can prevent surface runoff containing corrosive de-icing agents from seeping into the permeable concrete area, ensuring the durability of the permeable concrete.

[0059] The side of the shoulder wall away from the pavement structure layer 5 is the roadbed slope. The top surface 7 of the roadbed slope is connected to the top surface of the wall toe 2-1. The cross slope of the top surface 7 of the roadbed slope is set to 4%.

[0060] In this embodiment, the shoulder wall causes minimal disturbance to the original roadbed slope, and the original roadbed slope protection facilities can be largely preserved and utilized, reducing abandoned projects. Furthermore, the shoulder wall provides lateral support for the pavement structure layer 5, making full use of the shoulder wall's supporting effect on the pavement and improving the overall stability of the pavement structure. This not only avoids the additional land occupation caused by sloping the roadbed slope during pavement overlay and reconstruction, but also ensures smooth drainage of water accumulation inside the pavement structure layer 5 through the design of the wall body 1 structure. The construction process is simple, resulting in significant social and economic benefits.

[0061] Example 2

[0062] In another typical embodiment of the present invention, such as Figures 5-7As shown, a road shoulder wall with drainage function for embankment section pavement overlay reconstruction project is proposed, the overall structure of which is the same as the road shoulder wall structure described in Embodiment 1, and the difference is that the curb is a vertical curb 9 structure.

[0063] The road shoulder wall in the embodiment is mainly applied to a road section where road surface runoff is concentrated and discharged (such as Figure 5 As shown, the road surface runoff is collected by the vertical curb 9 and discharged through other drainage facilities on the roadside of the highway. The main function of the external isolation layer 1-1 is to prevent direct precipitation in nature from penetrating into the drainage layer 1-2 inside the road shoulder wall. The transverse slope of the external isolation layer 1-1 is set to 2%, which ensures that the water flow on the external isolation layer 1-1 can be discharged in time.

[0064] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A self-draining shoulder wall for road embankment overlay and reconstruction projects, characterized in that, The shoulder wall adopts a stepped base and is set on the top surface of the subgrade and adjacent to the pavement structure layer to provide lateral support for the pavement structure layer. It includes a wall body, a foundation and a subbase arranged from top to bottom. The overall height of the shoulder wall is the same as the thickness of the pavement structure layer. The wall body consists of an external partition layer, a drainage layer and a bottom partition layer arranged from top to bottom. The top surface of the external partition layer is provided with a cross slope and is connected to the top surface of the pavement structure layer. A curb stone is provided between the external partition layer and the pavement structure layer. The drainage layer is a permeable cement concrete structure to allow water accumulated inside the pavement structure layer to drain outwards; the bottom partition layer is provided with a cross slope. The subbase and foundation combine to form a stepped structure, and the foundation and wall combine to form a stepped structure. One side of the foundation extends beyond the edge of the wall to form a wall toe, and the top surface of the wall toe is provided with a transverse slope.

2. A self-draining shoulder wall for road embankment overlay and reconstruction projects according to claim 1, characterized in that, The wall is provided with several settlement expansion joints, which are filled with asphalt-impregnated hemp fibers.

3. A self-draining shoulder wall for road embankment overlay and reconstruction projects according to claim 1, characterized in that, The road structure layers, from top to bottom, consist of an asphalt concrete surface layer, a large-particle-size permeable asphalt concrete flexible base course, a semi-rigid upper base course, a semi-rigid lower base course, and a semi-rigid subbase course. A curb stone is set between the asphalt concrete surface layer and the wall. The semi-rigid upper base course, semi-rigid lower base course, and semi-rigid subbase course are combined to form a stepped structure.

4. A self-draining shoulder wall for road embankment overlay and reconstruction projects according to claim 3, characterized in that, The cushion layer is located on one side of the semi-rigid subbase and has the same height as the semi-rigid subbase. The cushion layer and the semi-rigid subbase together support the foundation. The top surface of the cushion layer is horizontal and has no transverse slope.

5. A self-draining shoulder wall for road embankment overlay and reconstruction projects according to claim 3, characterized in that, The foundation is located on one side of the semi-rigid subbase and the foundation is at the same height as the semi-rigid subbase. One side of the cushion layer extends beyond the edge of the foundation.

6. A self-draining shoulder wall for road embankment overlay and reconstruction projects according to claim 3, characterized in that, The semi-rigid subbase and the foundation work together to support the wall.

7. A self-draining shoulder wall for road embankment overlay and reconstruction projects according to claim 6, characterized in that, The top surface of the wall toe is smoothly connected to the top surface of the roadbed slope, and the top surface of the roadbed slope is provided with a cross slope that is greater than the slope of the wall toe.

8. A self-draining shoulder wall for road embankment overlay and reconstruction projects according to claim 3, characterized in that, The bottom partition layer is set above the semi-rigid subbase and foundation.

9. A self-draining shoulder wall for road embankment overlay and reconstruction projects according to claim 1, characterized in that, Both the external isolation layer and the bottom isolation layer are made of cement concrete. The external isolation layer is used to prevent surface water and natural precipitation from seeping into the drainage layer, while the bottom isolation layer is used to prevent water discharged from the pavement structure layer from seeping down from the drainage layer into the lower part of the pavement structure layer.

10. A self-draining shoulder wall for road embankment overlay and reconstruction projects according to claim 1, characterized in that, The curbstone can be either a flat curbstone or a vertical curbstone.

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