Roadbed lower spring opening treatment structure
By setting up blind drain sections and infiltration systems under the roadbed, the problems of accurate positioning, cumbersome construction, and incomplete sealing in spring treatment were solved, achieving effective drainage of spring water and improving the stability of the roadbed.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-03-03
AI Technical Summary
Existing technologies for treating springs under roadbeds, such as grouting and sealing, suffer from difficulties in precise location, cumbersome construction, high costs, incomplete sealing, and groundwater leakage, resulting in insufficient stability and durability of the roadbed.
The method involves excavating blind drain sections, installing composite geomembranes and permeable geotextiles, and combining upper and lower permeable blind pipes and manifolds to form a permeable layer and a permeable layer. This diverts spring water to the roadside drainage system and isolates the spring water from the roadbed soil.
It effectively drains seepage water, reduces water pressure, isolates water bodies from the roadbed, improves the stability and durability of the roadbed, and prevents seepage water from eroding the roadbed and causing structural instability.
Smart Images
Figure CN223963779U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of road construction technology, specifically to a structure for treating springs under roadbeds. Background Technology
[0002] Existing lakeside municipal roads, especially in areas with high groundwater levels such as lakesides and wetlands, often suffer from seepage problems due to the presence of springs in the roadbed. The gushing water from these springs easily leads to long-term erosion of the roadbed soil, causing frost heave, softening, and even structural instability, seriously threatening the road's service life and driving safety. Currently, the traditional treatment method commonly used in the industry is grouting, which involves injecting cement grout into the spring to seal the seepage channels.
[0003] However, this traditional method has the following drawbacks: Precisely locating grouting holes is difficult, especially under complex geological conditions, making it hard to trace seepage paths and resulting in significant uncertainty regarding the grouting range and depth, thus hindering quality control; the grouting process is cumbersome, requiring multiple drilling, grouting, and curing operations, leading to lengthy construction periods and high costs; when the spring water pressure is high, the grout is easily dispersed by the water flow, causing sealing failure, and repeated construction not only wastes resources but may also exacerbate roadbed disturbance. Furthermore, simply sealing does not solve the groundwater drainage problem; long-term water pressure accumulation may still seep into the roadbed from weak points, creating hidden dangers.
[0004] Therefore, there is an urgent need for a structure that can effectively drain seepage and reduce water pressure, while also isolating water bodies from the roadbed soil, in order to improve the stability and durability of the roadbed. Utility Model Content
[0005] To address the above problems, this utility model provides a roadbed spring treatment structure that can collect spring water and drain it out of the roadbed to ensure the structural stability of the roadbed.
[0006] A construction method for a roadbed subgrade spring treatment structure includes:
[0007] S1: Determine the location of the spring and excavate the road section corresponding to the spring location to form a blind ditch section;
[0008] S2: Composite geomembrane and permeable geotextile are installed in the blind drain section to form a water catchment area. Permeable blind pipes and manifolds are installed in the water catchment area to drain the spring water out of the water catchment area.
[0009] S3: Backfill the blind drain section area to form a permeable layer;
[0010] S4: A permeable layer is provided on the permeable layer;
[0011] S5: The roadbed is filled on the permeable layer, and the pavement structure layer is constructed on the roadbed.
[0012] Furthermore, 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 also includes:
[0013] On the road section corresponding to the location of the spring, a downward slope is set from both ends of the road section in the longitudinal direction towards the middle to ensure that the seepage water of the blind ditch section converges in the middle.
[0014] Furthermore, the step of installing composite geomembrane and permeable geotextile in the blind drain section to form a catchment area, and installing permeable blind pipes and manifolds in the catchment area to drain water out of the catchment area also includes:
[0015] A composite geomembrane is installed at the bottom of the blind ditch section and on the side closest to the road drainage system; geotextile is installed on the green side of the blind ditch section; an inclined permeable blind pipe extending along the length of the blind ditch section is installed within the blind ditch section; two layers of permeable blind pipes are installed in the catchment area, with permeable holes along the pipe wall. After the spring water enters the permeable blind pipe through the permeable holes, it accumulates through the upper and lower manifolds and is then discharged from the roadbed corresponding to the blind ditch section through the manifold, and finally discharged into the roadside drainage system.
[0016] Furthermore, the step of backfilling the blind drain section to form a permeable layer also includes:
[0017] Backfill the blind drain section with pebbles to form a permeable layer;
[0018] A downward slope is provided at the top of the backfilled pebble layer, sloping from both ends towards the middle along the longitudinal direction of the blind ditch section.
[0019] Furthermore, the step of setting a permeable layer on the permeable layer also includes:
[0020] A permeable geotextile is installed on the top surface of the permeable layer to form a permeable layer.
[0021] Furthermore, the spring treatment structure also includes:
[0022] Gravel is laid on the permeable geotextile to form a gravel layer; a second geotextile is laid on the gravel layer, and sand and gravel are placed on the second geotextile to form a sand and gravel layer; the road structure layer construction work is carried out.
[0023] Correspondingly, this utility model also provides a roadbed subgrade spring treatment structure, including:
[0024] The blind ditch section is formed by excavating the road section corresponding to the location of the spring after the spring is located. The road section where the blind ditch section is located has a slope that slopes downward from both ends to the middle in the longitudinal direction.
[0025] The composite geomembrane and geotextile are used, wherein the composite geomembrane is installed at the bottom of the blind ditch section and on the side closest to the road drainage system, and the geotextile is installed on the green side of the blind ditch section, together forming a water catchment area.
[0026] The seepage blind pipes and manifolds are set in the catchment area. The upper and lower seepage blind pipes are provided with seepage holes along the pipe walls. The spring water enters the seepage blind pipes through the seepage holes. The water in the upper seepage blind pipes is collected through the upper manifold and the water in the lower seepage blind pipes is collected through the lower manifold. The water is then discharged from the manifold to the roadbed corresponding to the blind ditch section and finally discharged into the drainage system.
[0027] The permeable layer is formed by backfilling pebbles in the blind drain section, and the top of the pebble layer is sloped downward from both ends to the middle along the longitudinal direction of the blind drain section;
[0028] Permeable layer: Located on top of the permeable layer, it is composed of permeable geotextile;
[0029] Roadbed and pavement structure layer: The roadbed is filled on a permeable layer, and the pavement structure layer is constructed on the roadbed.
[0030] Furthermore, the upper and lower layers of seepage blind pipes are staggered and both have a certain slope along the longitudinal direction of the blind ditch section; the seepage holes of the seepage blind pipes are arranged in a quincunx pattern, and both the upper and lower seepage blind pipes are wrapped with a permeable geotextile.
[0031] Furthermore, the manifold is equipped with a connector at the intersection with the seepage blind pipe, a tee joint at the intersection with the green belt side, and a four-way joint at the intersection with the road drainage system side.
[0032] Furthermore, it includes a gravel layer, a second geotextile, and a sand and gravel layer sequentially arranged on a permeable geotextile, wherein the sand and gravel layer is composed of graded sand and gravel; a water-stabilized base course and an asphalt surface course are also sequentially laid on the sand and gravel layer.
[0033] This utility model has the following beneficial technical effects:
[0034] By installing two layers of longitudinal seepage blind pipes in the blind ditch section corresponding to the spring, the spring water is collected through the seepage blind pipes and flows into the manifold, and then the water is diverted out of the roadbed through the manifold and finally discharged into the roadside drainage system. By installing a composite geomembrane at the bottom of the excavated area of the blind ditch section and on the roadbed side near the road, the contact between the roadside spring water and the soil layer under the roadbed is isolated, preventing the spring water from seeping into the roadbed soil and affecting the roadbed strength. A gravel layer is backfilled on the waterproof layer and a permeable geotextile is installed to form a permeable layer, ensuring that the seepage water can be collected and discharged smoothly. At the same time, the gravel layer plays a role in sealing the spring and improving its strength, ultimately achieving the purpose of drainage and pressure relief. Attached Figure Description
[0035] Figure 1 This is a flowchart of the spring treatment structure provided in this embodiment;
[0036] Figure 2 This is a schematic diagram of the spring treatment plan provided in this embodiment;
[0037] Figure 3 This is a schematic diagram of the elevation of the spring treatment provided in this embodiment;
[0038] Figure 4 This is a schematic diagram of the cross-section of the spring treatment provided in this embodiment.
[0039] The numbers in the diagram represent: 1. Excavation boundary; 2. Roadbed; 3. Drainage system; 4. Blind drain section; 5. Catchment area; 6. Upper layer permeable blind pipe; 7. Lower layer permeable blind pipe; 8. Upper layer manifold; 9. Lower layer manifold; 10. T-junction; 11. Four-way junction; 12. Composite geomembrane; 13. Geotextile; 14. Gravel layer; 15. Permeable geotextile; 16. Gravel layer; 17. Second geotextile; 18. Sand and gravel layer; 19. Road structure layer. Detailed Implementation
[0040] To make the objectives, technical solutions, and advantages of this embodiment clearer, the technical solutions of this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this spring-fed processing structure, and not all embodiments. The components of this embodiment described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0041] Please see Figures 1 to 4 This utility model provides a spring water treatment structure that can collect spring water seepage and discharge it outside the roadbed to ensure the structural stability of the roadbed.
[0042] The spring treatment structure includes the following steps:
[0043] Step S1: Determine the location of the spring and excavate the road section corresponding to the spring location to form a blind ditch section.
[0044] In this embodiment, after a spring is found on the roadbed, a blind ditch can be dug in the road section before and after the spring to clean and level the area around the spring, and at the same time, it can facilitate the flow of water gushing from the spring along the blind ditch section.
[0045] Specifically, the water outlet section corresponding to the spring location will be excavated, with an excavation depth of no less than 30cm below the bottom blind pipe, and the excavation range extending longitudinally 7.4m from the spring location, with the entire cross-section of the roadbed being excavated.
[0046] In this embodiment, step S1 may include the following sub-steps:
[0047] Sub-step S11: On the road section corresponding to the spring location, a downward slope is set from both ends of the road section in the longitudinal direction towards the middle, so as to ensure that the seepage water of the blind ditch section converges in the middle.
[0048] In this embodiment, after excavation, the surface is leveled, and a 1.5% cross slope is set in the blind ditch section from both ends of the road towards the center of the road, so that the water flow converges at the center of the road, ensuring smooth water flow and preventing the water from flowing in all directions.
[0049] In this embodiment, the spring treatment structure further includes:
[0050] Step S2: A composite geomembrane is installed at the bottom of the blind ditch section and on the side closest to the road drainage system, and geotextile is installed on the green side of the blind ditch section to form a water catchment area. In the water catchment area, a seepage blind pipe and a manifold are installed to drain the water out of the water catchment area.
[0051] In this embodiment, a composite geomembrane is installed at the bottom of the blind ditch section corresponding to the spring and on the side near the road drainage system, and geotextile is installed on the green side of the blind ditch section to form a water catchment area, thereby preventing water from seeping and spreading into the roadbed and reducing the impact of water on the roadbed of other areas.
[0052] In this embodiment, step S2 may include the following sub-steps:
[0053] Sub-step S21 involves installing a composite geomembrane at the bottom of the blind drain section and on the side closest to the road drainage system. In this embodiment, a composite geomembrane with a total length of 7.4m is installed along the front and rear extension directions of the blind drain section corresponding to the spring location, thereby preventing seepage water from the spring from infiltrating and spreading into the roadbed.
[0054] Sub-step S22: Geotextile is installed on the green side of the blind ditch section. In this embodiment, a total length of 7.4m of geotextile is installed in the front and rear extension directions of the blind ditch section corresponding to the spring location, thereby introducing seepage water from the green belt into the blind ditch section.
[0055] Sub-step S23: Install a seepage blind pipe that extends along the length of the blind ditch section and is inclined within the blind ditch section.
[0056] In this embodiment, the seepage blind pipes are arranged in two layers, with two seepage blind pipes in the upper layer and two seepage blind pipes in the lower layer. The distance between the two layers of seepage blind pipes can be 30cm.
[0057] Specifically, the upper and lower layers of blind pipes are also staggered in the horizontal arrangement, with a staggered distance of 25cm.
[0058] In this embodiment, both the upper and lower layers of seepage blind pipes are set with a slope of 0.5% along the longitudinal direction of the blind ditch section, 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 can be collected from both ends to the middle in the blind pipe.
[0059] In this embodiment, the upper and lower layers of seepage blind pipes can be made of PE pipe with an outer diameter of 160mm. The seepage blind pipes need to be drilled around all four sides, and the drilling diameter can be 20mm.
[0060] Specifically, the drilling holes for seepage blind pipes can be arranged in a quincunx pattern, with a longitudinal spacing of 100mm, and the holes should be staggered.
[0061] It should be noted that upper and lower seepage blind pipes of different diameters can be selected according to the water flow rate.
[0062] In this embodiment, the upper and lower seepage blind pipes are wrapped with a permeable geotextile to prevent foreign objects from entering the upper and lower seepage blind pipes under the influence of water flow, thereby preventing blockage.
[0063] Sub-step S24: Set up an upper manifold pipe connected to the upper seepage blind pipe and a lower manifold pipe connected to the lower seepage blind pipe. Through the upper manifold pipe and the lower manifold pipe, the seepage water in the upper seepage blind pipe and the lower seepage blind pipe is discharged into the roadbed corresponding to the blind ditch section.
[0064] In this embodiment, the upper manifold and the lower manifold are located at the lowest point of the upper and lower seepage blind pipes along the longitudinal direction of the blind ditch section, that is, at the middle position of the longitudinal direction of the blind ditch section.
[0065] Specifically, the upper manifold is arranged perpendicularly to the upper infiltration blind pipe, and the lower manifold is arranged perpendicularly to the lower infiltration blind pipe. The lengths of the upper and lower manifolds are set to ensure that the minimum distance between them extending beyond the roadbed is 50cm.
[0066] In this embodiment, a connector is provided at the intersection of the manifold and the seepage blind pipe.
[0067] Specifically, a T-junction is installed at the intersection of the manifold and the seepage blind pipe on the side near the green belt, and a four-way connector is installed at the intersection of the manifold and the seepage blind pipe on the side near the road drainage system.
[0068] Optionally, the upper and lower manifolds can be made of PE pipes with an outer diameter of 225mm.
[0069] It should be noted that upper and lower manifolds of different diameters can be selected according to the water flow rate.
[0070] In this embodiment, the spring 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 by changing the gradation, the stability of the embankment in the seepage area can be maintained, preventing soil erosion and seepage water from scouring the embankment, while ensuring smooth drainage of seepage water, thereby achieving the purpose of draining spring water from the embankment.
[0073] In this embodiment, step S3 may include the following sub-steps:
[0074] Sub-step S31: Backfill the intercepting area with pebbles 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 manifold. After the lower seepage blind pipe and the lower manifold are laid, the second pebble layer is backfilled to the bottom of the upper seepage blind pipe and the upper manifold. After the upper seepage blind pipe and the upper manifold are laid, the third pebble layer is backfilled.
[0076] Specifically, in this embodiment, the thickness of the backfill pebble layer can be 110cm.
[0077] Furthermore, step S3 also includes:
[0078] Sub-step S32: Set a downward slope at the top of the backfilled pebbles, sloping from both ends towards 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%, it is ensured that the seepage water flow direction can always flow in the preset direction.
[0080] In this embodiment, the spring treatment structure further includes:
[0081] Step S4: Install 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 green planting soil layer can smoothly seep into the permeable layer.
[0083] It should also be noted that appropriate reinforcement should be applied to the geotextile overlap area, and the overlap length should not be less than 50cm.
[0084] In this embodiment, the spring treatment structure further includes:
[0085] Step S5: Fill the roadbed on the permeable geotextile, and construct the pavement structure layer on the roadbed.
[0086] In this embodiment, the roadbed structure construction can be carried out after the permeable geotextile is constructed.
[0087] In this embodiment, step S5 may include the following sub-steps:
[0088] Sub-step S51: Lay gravel on the permeable geotextile to form a gravel layer.
[0089] In this embodiment, by laying gravel on the permeable geotextile to form a gravel layer that serves as a filter layer for the roadbed, the stability of the roadbed can be improved.
[0090] Alternatively, the gravel can be cobblestones, and the thickness of the gravel layer can be 50 cm.
[0091] Sub-step S52: Lay a second geotextile on the gravel layer, and place sand and gravel on the second geotextile to form a sand and gravel layer.
[0092] In this embodiment, a gravel layer is formed by laying a second geotextile on the gravel layer and then spreading natural sand and gravel on the second geotextile.
[0093] Optionally, the second geotextile can be a two-layer geotextile with a membrane, the gravel can be graded gravel, and the thickness of the gravel layer can be 30cm.
[0094] Sub-step S53 involves the construction of the road surface structure.
[0095] In this embodiment, after the gravel layer is completed, the water-stabilized base course and the asphalt surface course are laid sequentially on the gravel layer, thus completing the entire construction process.
[0096] Optionally, the thickness of the water-stabilized base course can be 25cm, and the thickness of the asphalt surface course can be 10cm.
[0097] In summary, this utility model embodiment provides a spring-fed drainage structure. This method prevents spring water from seeping and spreading to the surrounding roadbed soil. By installing two layers of longitudinal seepage blind pipes in the blind ditch section corresponding to the spring, the spring water is collected through the seepage blind pipes and flows into a manifold, which then drains the water out of the roadbed and finally into the roadside drainage system. This not only prevents the spring water from eroding the roadbed but also acts as a barrier against groundwater, providing better protection for the stability of the roadbed.
[0098] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. A road subgrade under-spring treatment structure, characterized in that, It comprises: a blind ditch section (4) formed by excavating the road section corresponding to the location of the spring after the location of the spring is determined, the road section where the blind ditch section (4) is located is provided with a slope inclined downward from the longitudinal two ends to the middle; a composite geomembrane (12) and a geotextile (13), the composite geomembrane (12) is arranged at the bottom of the blind ditch section (4) and the side close to the road drainage system, and the geotextile (13) is arranged at the green side of the blind ditch section (4), both of which form a catchment area (5) together; a water seepage blind pipe and a collecting pipe are arranged in the catchment area (5), the upper water seepage blind pipe (6) and the lower water seepage blind pipe (7) are provided with water seepage holes along the pipe wall, the spring water enters the water seepage blind pipe through the water seepage holes, the water in the upper water seepage blind pipe (6) is collected through the upper collecting pipe (8), and the water in the lower water seepage blind pipe (7) is collected through the lower collecting pipe (9), and then discharged from the blind ditch section corresponding to the roadbed, and finally discharged into the drainage system (3); a permeable layer formed by backfilling pebbles in the blind ditch section (4), the top of the pebble layer (14) is provided with a slope inclined downward from the longitudinal two ends to the middle of the blind ditch section (4); a water seepage layer: arranged on the top surface of the permeable layer and composed of water seepage geotextile (15); a roadbed (2) and a pavement structure layer (19): the roadbed (2) is filled on the water seepage layer, and the pavement structure layer (19) is constructed on the roadbed.
2. The eye treatment structure of claim 1, wherein The upper and lower water seepage blind pipes are arranged staggered and both are provided with a certain slope along the longitudinal direction of the blind ditch section (4); the water seepage holes of the water seepage blind pipe are arranged in a plum blossom shape, and the upper water seepage blind pipe (6) and the lower water seepage blind pipe (7) are both wrapped with water seepage geotextile (15) for one turn.
3. The eye treatment structure of claim 1, wherein The collecting pipe is provided with a connecting piece at the intersection with the water seepage blind pipe, a three-way joint (10) at the intersection close to the green belt side, and a four-way joint (11) at the intersection close to the road drainage system side.
4. The eye treatment structure of claim 1, wherein It comprises a gravel layer (16), a second geotextile (17) and a sand and gravel layer (18) arranged on the water seepage geotextile (15) in sequence, the thickness of the gravel layer (16) is 50 cm, the sand and gravel layer (18) is composed of graded sand and gravel, and the thickness is 30 cm; a water stable base layer and an asphalt surface layer are further laid on the sand and gravel layer (18) in sequence.