Roadbed lower spring opening treatment structure and construction method thereof
By digging a blind trench section at the spring under the roadbed and setting up composite geomembrane, seepage geotextile and seepage blind pipes, the problem of difficult water seepage in the spring is solved, and the effect of effectively diverting seepage and reducing water pressure is achieved, and the stability and durability of the roadbed are improved.
Patent Information
- Application Number
- CN202510202141.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2025-05-30
AI Technical Summary
When dealing with the springs under the roadbed, the positioning of the grouting holes is difficult to track, and the seepage path is difficult to track, resulting in difficult to control the construction quality, long construction period and high cost, and simple sealing cannot solve the problem of groundwater discharge. Long-term water pressure accumulation may still seep into the roadbed, hiding hidden dangers.
By digging a blind trench section at the spring eye location, setting up a composite geomembrane and seepage geotextile to form a catchment area, two upper and lower layers of seepage blind pipes and busbars are set up in the catchment area to drain out the spring water, and a seepage layer is set on the permeable layer to ensure that the seepage can be collected and discharged smoothly.
Effectively guide seepage, reduce water pressure, isolate water from roadbed soil, improve roadbed stability and durability, avoid freezing, softening and structural instability problems, and reduce construction costs and construction periods.
Smart Images
Figure CN120061195A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of road construction, and particularly relates to a spring treatment structure under a road subgrade and a construction method thereof. Background Art
[0002] For the existing lakeside municipal roads, especially in areas with high groundwater levels such as lakesides and wetlands, the road subgrades often have seepage problems due to the existence of springs. The spring water gushing is likely to cause the subgrade soil to be eroded by seepage water for a long time, resulting in frost heaving, softening and even structural instability, seriously threatening the service life of the road and driving safety. At present, the commonly used traditional treatment method in the industry is the grouting plugging method, that is, injecting cement slurry into the spring to seal the seepage channel.
[0003] However, the traditional method has the following deficiencies: it is difficult to accurately locate the grouting holes. Especially under complex geological conditions, it is difficult to trace the seepage path, resulting in great uncertainty in the grouting range and depth, and it is difficult to control the construction quality; the grouting process is cumbersome, requiring multiple drilling, grouting and curing, with a long construction period and high cost; when the spring water pressure is high, the slurry is easily washed away by the water flow, resulting in the failure of plugging. Repeated construction not only wastes resources, but may also exacerbate the disturbance of the subgrade. In addition, simply plugging does not solve the problem of groundwater drainage, and the long-term water pressure accumulation may still seep into the subgrade from weak parts, hiding potential hazards.
[0004] Therefore, there is an urgent need for a comprehensive treatment plan that can effectively drain seepage water, reduce water pressure, and isolate water from the subgrade soil to improve the stability and durability of the subgrade. Summary of the Invention
[0005] In order to solve the above problems, the present invention provides a spring treatment structure under a road subgrade and a construction method thereof, which can collect the spring seepage water and drain it outside the subgrade to ensure the structural stability of the subgrade.
[0006] A construction method of a spring treatment structure under a road subgrade includes:
[0007] S1: Determine the spring position and conduct excavation treatment on the section corresponding to the spring position to form a blind ditch section;
[0008] S2: Set a composite geomembrane and a permeable geotextile in the blind ditch section to form a water collection area, and set a permeable blind pipe and a confluence pipe in the water collection area to drain the spring water in the water collection area;
[0009] S3: Conduct backfilling operation on the blind ditch section area to form a permeable layer;
[0010] S4: Set a permeable layer on the permeable layer;
[0011] S5: Fill the road subgrade on the permeable layer, and construct the road surface structure layer on the road subgrade.
[0012] Further, the step of determining the location of the spring and excavating the road section corresponding to the spring location to form a blind ditch section further includes:
[0013] On the road section corresponding to the spring location, a slope is set that slopes downward from both ends to the middle along the longitudinal direction of the road section to ensure that the seepage water in the blind ditch section converges to the middle.
[0014] Further, the step of setting a composite geomembrane and a permeable geotextile in the blind ditch section to form a water collection area, and setting a permeable blind pipe and a confluence pipe in the water collection area to drain the water in the water collection area further includes:
[0015] A composite geomembrane is set at the bottom of the blind ditch section and on the side close to the road drainage system; a geotextile is set on the greening side of the blind ditch section; a permeable blind pipe extending along the length direction of the blind ditch section and inclined is set in the blind ditch section; two layers of permeable blind pipes are set in the water collection area, and water seepage holes are arranged along the pipe wall of the permeable blind pipe. After the spring water enters the permeable blind pipe through the water seepage holes, it is accumulated through the upper-layer confluence pipe and the lower-layer confluence pipe, and then the water is drained from the confluence pipe out of the roadbed corresponding to the blind ditch section and finally discharged into the roadside drainage system.
[0016] Further, the step of backfilling the blind ditch section area to form a permeable layer further includes:
[0017] Backfill pebbles in the blind ditch section area to form a permeable layer;
[0018] On the top of the backfilled pebble layer, a slope is set that slopes downward from both ends to the middle along the longitudinal direction of the blind ditch section.
[0019] Further, the step of setting a permeable layer on the permeable layer further includes:
[0020] Set a permeable geotextile on the top surface of the permeable layer to form a permeable layer.
[0021] Further, the spring treatment structure further includes:
[0022] Lay gravel on the permeable geotextile to form a gravel layer; lay a second geotextile on the gravel layer, and set gravel on the second geotextile to form a gravel layer; carry out the construction operation of the road surface structure layer.
[0023] Correspondingly, the present invention also provides a spring treatment structure under a roadbed, including:
[0024] A blind ditch section, formed by excavating the road section corresponding to the spring location after determining the spring location, and the road section where the blind ditch section is located is provided with a slope that slopes downward from both ends to the middle along the longitudinal direction;
[0025] A composite geomembrane and a geotextile. The composite geomembrane is arranged at the bottom of the blind ditch section and on the side close to the road drainage system, and the geotextile is arranged on the greening side of the blind ditch section. The two together form a water collection area;
[0026] A seepage blind pipe and a confluence pipe are arranged in the water collection area. The upper seepage blind pipe and the lower seepage blind pipe are provided with seepage holes along the pipe wall. The spring water enters the seepage blind pipe through the seepage holes. After the water collected by the upper seepage blind pipe and the lower seepage blind pipe is accumulated through the upper confluence pipe and the lower confluence pipe respectively, it is discharged from the roadbed corresponding to the blind ditch section by the confluence pipe and finally discharged into the drainage system;
[0027] A permeable layer is formed by backfilling pebbles in the blind ditch section. A slope is set at the top of the pebble layer, sloping downward from both longitudinal ends of the blind ditch section towards the middle;
[0028] A seepage layer: is arranged on the top surface of the permeable layer and is composed of a permeable geotextile;
[0029] A roadbed and a pavement structure layer: The roadbed is filled on the seepage layer, and the pavement structure layer is constructed on the roadbed.
[0030] Furthermore, the upper and lower seepage blind pipes are arranged staggeredly and are both set with a certain slope along the longitudinal direction of the blind ditch section; the seepage holes of the seepage blind pipes are arranged in a plum blossom shape, and both the upper seepage blind pipe and the lower seepage blind pipe are wrapped around with a permeable geotextile for one week.
[0031] Furthermore, the confluence pipe is provided with a connecting piece at the intersection with the seepage blind pipe, a tee joint at the intersection on the side close to the green belt, and a cross joint at the intersection on the side close to the road drainage system.
[0032] Furthermore, it includes a gravel layer, a second geotextile, and a sand-gravel layer arranged in sequence on the permeable geotextile. The sand-gravel layer is composed of graded sand and gravel; a water-stable base layer and an asphalt surface layer are also laid in sequence on the sand-gravel layer.
[0033] The present invention has the following beneficial technical effects:
[0034] By arranging upper and lower longitudinal seepage blind pipes in the blind ditch section corresponding to the spring, the spring water is collected by the seepage blind pipes and then flows into the confluence pipe, and then the water is led out of the roadbed through the confluence pipe and finally discharged into the roadside drainage system; by arranging a composite geomembrane at the bottom of the excavation area in the blind ditch section and on the side of the roadbed close to the road, it is used to isolate the contact between the spring water on the roadside and the soil layer at the lower part of the roadbed, preventing the spring water seepage from damaging the roadbed soil and affecting the roadbed strength; by backfilling a pebble layer and setting a permeable geotextile on the waterproof layer to form a permeable layer, it ensures that the seepage can be smoothly collected and discharged unobstructed, and at the same time, the pebble layer plays the role of sealing the spring and improving the strength, and finally achieves the purpose of drainage and pressure relief. Description of the Drawings
[0035] Figure 1 Flow chart of the spring eye treatment structure provided in this embodiment;
[0036] Figure 2 Schematic plan view of the spring eye treatment provided in this embodiment;
[0037] Figure 3 Schematic elevation view of the spring eye treatment provided in this embodiment;
[0038] Figure 4 Schematic cross - section view of the spring eye treatment provided in this embodiment.
[0039] Numbers in the figure: 1. Excavation edge line; 2. Roadbed; 3. Drainage system; 4. Blind ditch section; 5. Water - collecting area; 6. Upper - layer seepage blind pipe; 7. Lower - layer seepage blind pipe; 8. Upper - layer confluence pipe; 9. Lower - layer confluence pipe; 10. Three - way joint; 11. Four - way joint; 12. Composite geomembrane; 13. Geotextile; 14. Cobblestone layer; 15. Permeable geotextile; 16. Gravel layer; 17. Second geotextile; 18. Sand - gravel layer; 19. Road surface structure layer. Detailed implementation manners
[0040] To make the objectives, technical solutions and advantages of this embodiment clearer, the technical solutions in this embodiment will be clearly and completely described below in conjunction with the accompanying drawings in this embodiment. Obviously, the described embodiments are part of the embodiments of this spring eye treatment structure, rather than all of the embodiments. Usually, the components of this embodiment described and shown in the accompanying drawings here can be arranged and designed in various different configurations.
[0041] Please refer to Figures 1 to 4 , the present invention provides a spring eye treatment structure, which can collect the spring eye seepage water and discharge it outside the roadbed to ensure the structural stability of the roadbed.
[0042] The spring eye treatment structure includes the following steps:
[0043] Step S1, determine the spring eye position and conduct excavation treatment on the section corresponding to the spring eye position to form a blind ditch section.
[0044] In this embodiment, after a spring eye is found on the roadbed, blind ditches can be excavated on the sections before and after the spring eye position to clean and level the area around the spring eye, and at the same time, it is convenient for the water gushing out from the spring eye to flow along the blind ditch section.
[0045] Specifically, conduct excavation treatment on the water - discharging section corresponding to the spring eye position. The excavation depth is not less than 30 cm below the bottom - layer blind pipe, the excavation range is longitudinally extended by 7.4 m from the spring eye position, and the entire cross - section of the roadbed is excavated.
[0046] In this embodiment, step S1 may include the following sub - steps:
[0047] Sub-step S11: Set a slope on the road section corresponding to the spring eye position, sloping downward from both ends to the middle along the longitudinal direction of the road section, so as to ensure that the seepage water in the blind ditch section converges towards the middle.
[0048] In this embodiment, after excavation, leveling is carried out, and a 1.5% cross slope is set in the blind ditch section from both ends of the road to the center of the road, so that the water flows towards the center of the road, ensuring smooth water flow and avoiding water flowing around.
[0049] In this embodiment, the spring eye treatment structure further includes:
[0050] Step S2: Set a composite geomembrane at the bottom of the blind ditch section and on the side close to the road drainage system, and set a geotextile on the greening side of the blind ditch section, so as to form a water collection area, and set a permeable blind pipe and a confluence pipe in the water collection area to drain the water in the water collection area.
[0051] In this embodiment, by setting a composite geomembrane at the bottom of the blind ditch section corresponding to the spring eye and on the side close to the road drainage system, and setting a geotextile on the greening side of the blind ditch section, a water collection area is formed to prevent water from seeping and diffusing under the road subgrade, thereby reducing the impact of water on the road subgrade in other areas.
[0052] In this embodiment, step S2 may include the following sub-steps:
[0053] Sub-step S21: Set a composite geomembrane at the bottom of the blind ditch section and on the side close to the road drainage system. In this embodiment, a total of 7.4 m long composite geomembrane is set in the front and back extension directions of the blind ditch section corresponding to the spring eye position, so as to prevent the seepage water of the spring eye from seeping and diffusing under the road subgrade.
[0054] Sub-step S22: Set a geotextile on the greening side of the blind ditch section. In this embodiment, a total of 7.4 m long geotextile is set in the front and back extension directions of the blind ditch section corresponding to the spring eye position, so as to introduce the seepage water in the green belt into the blind ditch section.
[0055] Sub-step S23: Set a permeable blind pipe extending along the length direction of the blind ditch section and inclined in the blind ditch section.
[0056] In this embodiment, two layers of permeable blind pipes are set, with 2 permeable blind pipes in the upper layer and 2 permeable blind pipes in the lower layer. The distance between the upper and lower layers of the permeable blind pipes can be 30 cm.
[0057] Specifically, the upper and lower layers of blind pipes are also staggered in the transverse arrangement, and the staggering distance can be 25 cm.
[0058] In this embodiment, both the upper and lower layers of the permeable blind pipes are longitudinally arranged along the blind ditch section with a slope of 0.5%, and the slope direction is from both ends of the blind ditch section to the middle of the blind ditch section, so that the seepage water in the blind ditch section converges from both ends to the middle in the blind pipes.
[0059] In this embodiment, the upper and lower layers of permeable blind pipes can be PE pipes with an outer diameter of 160 mm. The permeable blind pipes need to be drilled around, and the drilling diameter can be selected as 20 mm.
[0060] Specifically, the drilling holes of the permeable blind pipes can be arranged in a plum blossom shape. The longitudinal spacing of the drilling holes can be selected as 100 mm, and the drilling holes are arranged staggeredly.
[0061] It should be noted that the upper and lower layers of permeable blind pipes with different pipe diameters can be selected according to the size of the water flow.
[0062] In this embodiment, the upper and lower layers of permeable blind pipes are wrapped around with permeable geotextiles, so as to prevent foreign objects from entering the upper and lower layers of permeable blind pipes under the drive of water flow, thus causing blockage.
[0063] Sub-step S24: Set an upper confluence pipe connected to the upper permeable blind pipe, and set a lower confluence pipe connected to the lower permeable blind pipe. Through the upper confluence pipe and the lower confluence pipe, the seepage water in the upper permeable blind pipe and the lower permeable blind pipe is respectively discharged into the roadbed corresponding to the blind ditch section.
[0064] In this embodiment, the upper confluence pipe and the lower confluence pipe are arranged at the lowest longitudinal position of the upper and lower layers of permeable blind pipes along the blind ditch section, that is, the middle longitudinal position of the blind ditch section.
[0065] Specifically, the upper confluence pipe is arranged perpendicular to the upper permeable blind pipe, and the lower confluence pipe is arranged perpendicular to the lower permeable blind pipe. The lengths of the upper confluence pipe and the lower confluence pipe are set to ensure that the minimum distance extending outside the roadbed can be selected as 50 cm.
[0066] In this embodiment, a connector is provided at the intersection of the confluence pipe and the permeable blind pipe.
[0067] Specifically, a tee joint is provided at the intersection of the confluence pipe and the permeable blind pipe on the green belt side, and a four-way joint is provided at the intersection of the confluence pipe and the permeable blind pipe on the side of the road drainage system.
[0068] Optionally, the upper confluence pipe and the lower confluence pipe can be PE pipes with an outer diameter of 225 mm.
[0069] It should be noted that the upper and lower confluence pipes with different pipe diameters can be selected according to the size of the water flow.
[0070] In this embodiment, the spring eye treatment structure further includes:
[0071] Step S3, backfill the catchment area to form a permeable layer.
[0072] In this embodiment, by backfilling the catchment area to form a permeable layer and changing the gradation, the stability of the embankment in the seepage area can be maintained, the occurrence of soil flow can be prevented, and the embankment can be prevented from being scoured by seepage water. At the same time, the smooth discharge of seepage water can be ensured, so as to achieve the purpose of discharging the spring seepage water from the embankment.
[0073] In this embodiment, step S3 may include the following sub-steps:
[0074] Sub-step S31, backfill pebbles in the water interception area to form a permeable layer.
[0075] In this embodiment, the pebble layer is backfilled in layers. The first layer is backfilled to the bottom of the lower seepage blind pipe and the lower confluence pipe. After the lower seepage blind pipe and the lower confluence pipe are laid, the second layer of pebble layer is backfilled to the bottom of the upper seepage blind pipe and the upper confluence pipe. After the upper seepage blind pipe and the upper confluence pipe are laid, the third layer of pebble layer is backfilled.
[0076] Specifically, the thickness of the backfilled pebble layer in this embodiment can be 110 cm.
[0077] Further, step S3 further includes:
[0078] Sub-step S32, set a slope on the top of the backfilled pebbles that slopes downward from both ends to the middle along the longitudinal direction of the blind ditch section.
[0079] In this embodiment, by setting a longitudinal slope from both sides to the middle on the top of each backfilled pebble layer, and the slope can be 0.5%, so as to ensure that the water flow direction of seepage can always flow along the preset direction.
[0080] In this embodiment, the spring treatment structure further includes:
[0081] Step S4, set a permeable geotextile on the permeable layer.
[0082] In this embodiment, by setting a permeable geotextile on the permeable layer, the seepage water in the upper greening planting soil layer can smoothly penetrate into the permeable layer.
[0083] In addition, it should be noted that the lap part of the geotextile is appropriately strengthened, and the lap length is not less than 50 cm.
[0084] In this embodiment, the spring treatment structure further includes:
[0085] Step S5, construct a roadbed on the permeable geotextile, and construct a road surface structure layer on the roadbed.
[0086] In this embodiment, after the construction of the permeable geotextile is completed, the subgrade structure construction can be carried out.
[0087] In this embodiment, step S5 may include the following sub-steps:
[0088] Sub-step S51, laying gravel on the permeable geotextile to form a gravel layer.
[0089] In this embodiment, by laying gravel on the permeable geotextile, the formed gravel layer is used as the filter layer of the roadbed, thereby improving the stability of the roadbed.
[0090] Optionally, the gravel can be cobblestone gravel, and the thickness of the gravel layer can be 50 cm.
[0091] Sub-step S52, laying a second geotextile on the gravel layer, and setting gravel on the second geotextile to form a gravel layer.
[0092] In this embodiment, by laying a second geotextile on the gravel layer and spreading natural gravel on the second geotextile to form a gravel layer.
[0093] Optionally, the second geotextile can be a two-layer one-film waterproof geotextile, the gravel can be graded gravel, and the thickness of the gravel layer can be 30 cm.
[0094] Sub-step S53, carrying out the pavement structure construction operation.
[0095] In this embodiment, after the gravel layer is completed, a water-stable base course and an asphalt surface course are sequentially laid on the gravel layer, and thus the entire construction process is completed.
[0096] Optionally, the thickness of the water-stable base course can be 25 cm, and the thickness of the asphalt surface course can be 10 cm.
[0097] In summary, the embodiment of the present invention provides a spring treatment structure. This construction method prevents the water of the spring from seeping and spreading around the subgrade soil body. By arranging two layers of longitudinal water-permeable blind pipes in the blind ditch section corresponding to the spring, the spring water is collected by the water-permeable blind pipes and then flows into the confluence pipe, and then the water is led out of the road subgrade through the confluence pipe and finally discharged into the roadside drainage system. It not only prevents the scouring of the subgrade by the spring water gushing, but also plays a role in isolating the groundwater, providing better guarantee for the stability of the subgrade.
[0098] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims
1. A construction method for a spring treatment structure under a roadbed, characterized in that: include: Determine the location of the spring and excavate the road section corresponding to the location of the spring to form a blind ditch section; Composite geomembrane and permeable geotextile are installed in the blind ditch section to form a water collection area, and seepage blind pipes and confluence pipes are installed in the water collection area to drain the spring water in the water collection area; Backfilling the blind ditch section to form a permeable layer; Arranging a water-seepage layer on the water-permeable layer; The road subgrade is built on the seepage layer, and the pavement structure layer is constructed on the road subgrade.
2. The construction method of the spring treatment structure according to claim 1, characterized in that: The step of determining the location of the spring and excavating the road section corresponding to the location of the spring to form a blind ditch section also includes: On the road section corresponding to the location of the spring, a slope is set along the longitudinal ends of the road section, sloping downward toward the middle, so as to ensure that the seepage water of the blind ditch section is gathered in the middle.
3. The construction method of the spring treatment structure according to claim 1, characterized in that: The step of arranging a composite geomembrane and a water-permeable geotextile in the blind ditch section to form a water collection area, and arranging a seepage blind pipe and a confluence pipe in the water collection area to drain water out of the water collection area also includes: A composite geomembrane is arranged at the bottom of the blind ditch section and on the side close to the road drainage system; a geotextile is arranged on the greening side of the blind ditch section; a seepage blind pipe extending and inclined along the length direction of the blind ditch section is arranged in the blind ditch section; an upper and lower layer of seepage blind pipes are arranged in the water collection area, and seepage holes are arranged along the pipe wall of the seepage blind pipe. After the spring water enters the seepage blind pipe through the seepage holes, it is accumulated through the upper and lower confluence pipes, and then the confluence pipes discharge the water to the roadbed corresponding to the blind ditch section, and finally discharge it into the roadside drainage system.
4. The construction method of the spring treatment structure according to claim 1, characterized in that: The step of backfilling the blind ditch section area to form a permeable layer also includes: Backfill pebbles in the blind ditch area to form a permeable layer; A slope is set on the top of the backfilled pebble layer, which is inclined downward in the direction from both ends of the blind ditch section in the longitudinal direction to the middle.
5. The construction method of the spring treatment structure according to claim 1, characterized in that: The step of arranging a water-seepage layer on the water-permeable layer further comprises: arranging a water-seepage geotextile on the top surface of the water-permeable layer to form a water-seepage layer.
6. The construction method of the spring treatment structure according to claim 1, characterized in that: The spring eye treatment structure also includes: laying gravel on the permeable geotextile to form a gravel layer; laying a second geotextile on the gravel layer, and arranging gravel on the second geotextile to form a gravel layer; and performing pavement structure layer construction operations.
7. A spring treatment structure under a roadbed, characterized in that: include: The blind ditch section (4) is formed by excavating a road section corresponding to the location after the location of the spring is determined, and the road section where the blind ditch section (4) is located is provided with a slope that is inclined downward toward the middle along both ends of the longitudinal direction; A composite geomembrane (12) and a geotextile (13), wherein the composite geomembrane (12) is arranged at the bottom of the blind ditch section (4) and on the side close to the road drainage system, and the geotextile (13) is arranged on the greening side of the blind ditch section (4), and the two together form a water collection area (5); Seepage blind pipes and confluence pipes are arranged in the confluence area (5); seepage holes are arranged along the pipe walls of the upper seepage blind pipes (6) and the lower seepage blind pipes (7); spring water enters the seepage blind pipes through the seepage holes; the upper seepage blind pipes (6) pass through the upper confluence pipes (8) and the lower seepage blind pipes (7) pass through the lower confluence pipes (9); the water is then discharged from the confluence pipes to the roadbed corresponding to the blind ditch section, and finally discharged into the drainage system (3); The permeable layer is formed by backfilling pebbles in the blind ditch section (4), and the top of the pebble layer (14) is provided with a slope that is inclined downward toward the middle along the longitudinal ends of the blind ditch section (4); Water seepage layer: arranged on the top surface of the permeable layer, and composed of a water seepage geotextile (15); Road subgrade (2) and pavement structure layer (19): the road subgrade (2) is built on the water seepage layer, and the pavement structure layer (19) is constructed on the subgrade.
8. The spring treatment structure according to claim 7, characterized in that: The upper and lower layers of seepage blind pipes are arranged in a staggered manner and are both provided with a certain slope along the longitudinal direction of the blind ditch section (4); the seepage holes of the seepage blind pipes are arranged in a plum blossom shape, and the upper layer of seepage blind pipes (6) and the lower layer of seepage blind pipes (7) are both wrapped with a permeable geotextile (15).
9. The spring treatment structure according to claim 7, characterized in that: The confluence pipe is provided with a connector at the intersection with the seepage blind pipe, a three-way joint (10) is provided at the intersection close to the green belt side, and a four-way joint (11) is provided at the intersection close to the road drainage system side.
10. The spring eye treatment structure according to claim 7, characterized in that: The invention comprises a gravel layer (16), a second geotextile (17) and a gravel layer (16) which are sequentially arranged on a permeable geotextile (15); the gravel layer (16) has a thickness of 50 cm; the gravel layer (16) is composed of graded gravel and has a thickness of 30 cm; a water-stable base layer and an asphalt surface layer are sequentially laid on the gravel layer (16).