A drainage system for a refuse tip

Abstract

This utility model discloses a waste disposal site drainage system in the field of engineering waste disposal technology. The system includes a waste disposal site with its cross-section divided into sequential filling zones from low to high. A first drainage ditch is located outside the top ring platform of the waste disposal site. Second drainage ditches are located on both sides of the waste disposal site's filling slope. A third drainage ditch is located between the outer edges of the waste disposal platform. A retaining wall is located at the bottom of the waste disposal site's filling slope. An energy dissipation sedimentation tank is located on the side of the retaining wall away from the waste disposal site. A culvert blind ditch is installed within the waste disposal site. A temporary intercepting drainage ditch is located at the top of the waste disposal filling area. This utility model effectively reduces the drainage path of water accumulated within the waste disposal site by connecting corrugated pipes and drainage holes within the culvert blind ditch, while ensuring the connectivity of the culvert blind ditch and avoiding poor drainage of the permeable rockfill due to filling quality issues or long-term local blockages.

Description

Technical Field

[0001] This utility model relates to the field of engineering waste disposal technology, and in particular to a waste disposal site drainage system. Background Technology

[0002] In engineering projects involving earthwork excavation and filling, such as hydropower, water conservancy, and highway construction, a large amount of construction waste often needs to be permanently stockpiled, requiring the use of waste disposal sites. The stability of these sites directly affects the safety of the surrounding environment. Statistics show that drainage system failure is the main cause of landslides and seepage damage at waste disposal sites; therefore, the quality of the drainage system directly impacts the stability of the waste disposal site.

[0003] In spoil heaps, the main drainage system typically relies on bottom blind drains. These drains are usually constructed as a single unit, rising from the bottom to the top. However, traditional blind drains depend on permeable rockfill layers (particle size > 100mm) as drainage channels, which presents several problems: First, the rock particles in the permeable rockfill layer can break during spoil compaction or heavy machinery operation, causing pore blockage and failure. Second, fine-particle soil easily intrudes into the blind drains during filling, reducing drainage capacity. Furthermore, since quality problems with the blind drains usually occur after spoil heap filling, the drains are buried within the spoil, making subsequent remedial measures costly. Therefore, we propose a new spoil heap drainage system. Utility Model Content

[0004] In order to improve the problems mentioned above, such as the difficulty in quality control and the impact of failure on the stability of the existing waste disposal site drainage system, this utility model provides a waste disposal site drainage system.

[0005] This utility model provides a waste disposal site drainage system, which adopts the following technical solution:

[0006] A waste disposal site drainage system includes a waste disposal site, wherein the cross-section of the waste disposal site is divided into sequential filling zones from low to high; a first drainage ditch is provided on the outer side of the top ring platform of the waste disposal site; a second drainage ditch is provided on both sides of the waste disposal site's filling slope; a third drainage ditch is provided between the outer edges of the waste disposal platform; a retaining wall is provided at the bottom of the waste disposal site's filling slope; an energy dissipation sedimentation tank is provided on the side of the retaining wall away from the waste disposal site; a culvert blind ditch is provided in the waste disposal site; a temporary intercepting drainage ditch is provided on the top of the waste disposal site's filling area; the first, second, and third drainage ditches are connected at their connection points; and the temporary intercepting drainage ditch is connected to the second drainage ditch and the culvert blind ditch.

[0007] The culvert blind drain includes a corrugated pipe, and the lower end of the corrugated pipe penetrates the retaining wall. The outer wall of the corrugated pipe is provided with a reinforced concrete protective body. The corrugated pipe and the reinforced concrete protective body form a culvert section. A concrete cushion layer is provided at the bottom of the reinforced concrete protective body. A permeable rockfill layer is provided on the outside of the reinforced concrete protective body. A transitional filter material layer is provided between the permeable rockfill layer and the waste disposal site.

[0008] Optionally, the culvert blind ditch, the first intercepting drainage ditch, the second intercepting drainage ditch, the third intercepting drainage ditch, the retaining wall, and the energy dissipation sedimentation tank constitute a permanent drainage system, and the first intercepting drainage ditch, the second intercepting drainage ditch, the third intercepting drainage ditch, the culvert blind ditch, and the temporary intercepting drainage ditch constitute a temporary drainage system.

[0009] Based on the above technical features, the temporary drainage system drains the filling zones during the phased construction process without affecting the drainage operations during the process.

[0010] Optionally, the reinforced concrete protective body is provided with drainage pipes at intervals on the top and both sides of the corrugated pipe, which are connected to the permeable rockfill layer.

[0011] Based on the above technical features, water that seeps into the permeable rockfill layer can enter the corrugated pipe through the drainage pipe and then be discharged into the energy dissipation sedimentation tank through the corrugated pipe.

[0012] Optionally, the culvert blind drain is provided with structural joints at regular intervals according to the foundation conditions. The spacing between the two sets of structural joints is positively correlated with the quality of the foundation conditions. The better the foundation conditions, the longer the spacing; the worse the foundation conditions, the shorter the spacing.

[0013] Based on the above technical features, the design of structural joints meets the technical requirements of civil engineering. By taking into account different actual environments, the number of structural joints can be reasonably arranged to meet quality requirements while minimizing construction costs.

[0014] Optionally, the culvert blind drain is constructed in sections according to the filling area from low to high, and the top inlet of the culvert blind drain is higher than the platform height of the filling area.

[0015] Based on the above technical features, efforts should be made to prevent the inlet of the culvert blind ditch from being blocked by waste disposal sites.

[0016] Optionally, the temporary drainage ditch is set up in layers according to the filling zone, and the temporary drainage ditch is higher than the inlet position of the blind culvert of the filling zone.

[0017] Based on the above technical features, the water in the intercepting drainage ditch can be directed to the inlet of the culvert blind ditch and the corresponding second intercepting drainage ditch.

[0018] Optionally, the energy dissipation sedimentation tank includes a concrete tank body disposed on the side of the retaining wall, and the bottom of the inner cavity of the concrete tank body is lined with energy dissipation stones.

[0019] Based on the above technical features, the water flow from one side of the spoil disposal site into the energy dissipation sedimentation tank is faster, and the energy dissipation stones laid at the bottom can improve the energy dissipation rate. After the water body dissipates energy, it can effectively reduce the scouring of the ditch bed by the water flow.

[0020] Optionally, the culvert blind drain is composed of corrugated pipes and reinforced concrete protective body. The top of the culvert section is equipped with a grate steel cover plate, and its height position is higher than the top of the slag filling in the spoil disposal site, but lower than the first drainage ditch.

[0021] Based on the above technical features, after opening the grate steel cover, the culvert blind ditch can be used as a permanent backup drainage channel.

[0022] Optionally, an overflow gap is provided on the side of the first intercepting drainage ditch that is close to the culvert blind ditch, and a concrete bottom is provided on the outside of the overflow gap of the first intercepting drainage ditch.

[0023] Based on the above technical features, when the water volume in the first drainage ditch upstream of the spoil disposal site is large, the excess water overflows through the overflow gap into the blind culvert and is discharged, thereby improving the emergency response capability of the drainage system.

[0024] In summary, this utility model has the following beneficial effects:

[0025] 1. This utility model effectively reduces the drainage path of water accumulation in the slag body by connecting the corrugated pipe and drainage hole in the culvert blind ditch, while ensuring the connectivity of the culvert blind ditch and avoiding the problem of poor drainage of permeable rockfill due to filling quality issues or long-term local blockage.

[0026] 2. This utility model adopts a phased construction design for the spoil disposal site, which avoids the problem of mismatch between the drainage system and the actual spoil filling appearance caused by the early implementation of permanent intercepting drainage ditches. Furthermore, a temporary drainage system is used to drain the filling zones during the phased construction process without affecting the drainage operations during the distributed construction process.

[0027] 3. The culvert blind ditch of this utility model can serve as a backup drainage channel during operation, reducing the risk of overflow of the first, second and third drainage ditches in the event of heavy rain. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This utility model provides a permanent drainage system for the waste disposal site after its construction.

[0030] Figure 2 This utility model describes the drainage system during the filling process and the drainage system not implemented.

[0031] Figure 3 This is a diagram of the downstream end protection structure of the retaining wall in this utility model;

[0032] Figure 4 This is a cross-sectional view of the blind drain section of the culvert in this utility model;

[0033] Figure 5 This is a structural diagram of the upstream inlet section of the culvert blind drain of this utility model.

[0034] In the picture:

[0035] 1. Waste disposal site;

[0036] 2. First section of drainage ditch; 201. Overflow gap;

[0037] 3. Second drainage ditch; 31. Second drainage ditches have been implemented in sections during the zonal filling process; 32. Second drainage ditches are to be implemented during the zonal filling process.

[0038] 4. The third drainage ditch;

[0039] 5. Culvert blind drain; 51. Culvert blind drains already implemented in sections during zonal filling; 52. Culvert blind drains to be implemented in sections during zonal filling; 501. Concrete cushion layer; 502. Corrugated pipe; 503. Reinforced concrete protective structure; 504. Permeable rockfill layer; 505. Transitional reverse filter layer; 506. Drainage pipe;

[0040] 6. Retaining wall;

[0041] 7. Energy dissipation sedimentation tank; 701. Concrete tank body; 702. Energy dissipation stones;

[0042] 8. Temporary drainage ditch;

[0043] 9. Steel cover plate for the grate;

[0044] 10. Concrete base protection. Detailed Implementation

[0045] The following is in conjunction with the appendix Figures 1-5 The present invention will be described in further detail below.

[0046] like Figures 1-2 As shown, a waste disposal site drainage system includes a waste disposal site 1. The cross-section of the waste disposal site 1 is divided into sequential filling zones from low to high. A first drainage ditch 2 is provided on the outer side of the top ring platform of the waste disposal site 1. A second drainage ditch 3 is provided on both sides of the waste disposal slope of the waste disposal site 1. A third drainage ditch 4 is provided between the outer edges of the waste disposal platform of the waste disposal site 1. A culvert blind ditch 5 is provided in the waste disposal site 1. A temporary drainage ditch 8 is provided on the top of the waste disposal filling area of ​​the waste disposal site 1. The first drainage ditch 2, the second drainage ditch 3 and the third drainage ditch 4 are connected. The temporary drainage ditch 8 is connected to the second drainage ditch 3 and the culvert blind ditch 5. The permanent drainage system consists of culvert blind ditch 5, first intercepting drainage ditch 2, second intercepting drainage ditch 3, third intercepting drainage ditch 4, retaining wall 6, and energy dissipation sedimentation tank 7. The temporary drainage system consists of first intercepting drainage ditch 2, second intercepting drainage ditch 3, third intercepting drainage ditch 4, culvert blind ditch 5, and temporary intercepting drainage ditch 8. The permanent drainage system serves as the final drainage system when the spoil disposal site 1 has completely completed its spoil disposal operations. The temporary drainage system drains the filling zones during the phased construction process without affecting drainage operations during the distributed construction process.

[0047] like Figures 3-4 As shown, the culvert blind drain 5 includes a corrugated pipe 502, and the lower end of the corrugated pipe 502 penetrates the retaining wall 6. The outer wall of the corrugated pipe 502 is provided with a reinforced concrete protective body 503. The corrugated pipe 502 and the reinforced concrete protective body 503 form a culvert section. A concrete cushion layer 501 is provided at the bottom of the reinforced concrete protective body 503. A permeable rockfill layer 504 is provided on the outside of the reinforced concrete protective body 503. The stone particles of the permeable rockfill layer 504 can be weakly weathered stone slag with a particle size of 1cm to 80cm. A transitional filter material layer 505 is provided between the permeable rockfill layer 504 and the slag in the spoil disposal site 1. The transitional filter material particles of the transitional filter material layer 505 have a diameter of less than 10cm. The reinforced concrete protective body 503 is located at the top and both sides of the corrugated pipe 502, and is connected to the permeable rockfill layer 504 by drainage pipes 506 at intervals. The spacing between the drainage pipes 506 is generally no more than 1m, and the diameter of the drainage pipes 506 is no less than 10cm. Water that seeps into the permeable rockfill layer 504 enters the corrugated pipe 502 through the drainage pipes 506 and is then discharged through the corrugated pipe 502 into the energy dissipation sedimentation tank 7.

[0048] The culvert blind drain 5 is constructed in sections according to the filling area from low to high, and the top inlet of the culvert blind drain 5 is higher than the platform height of the filling area, for example, it can be 0.5~1m higher, so as to prevent the inlet of the culvert blind drain 5 from being blocked by the waste in the waste disposal site 1.

[0049] Structural joints are installed at regular intervals in the culvert blind drain according to the foundation conditions. These joints are equipped with water-stopping structures. The spacing between two sets of structural joints is positively correlated with the quality of the foundation conditions; better foundation conditions allow for longer spacing, and worse foundation conditions require shorter spacing. For example, if a structural joint is designed to be installed every 5-15 meters, the upper limit of the spacing can be used when the foundation conditions are good, such as a rock foundation with minimal settlement deformation, while the lower limit can be used when the foundation conditions are poor, such as a soil foundation with significant settlement deformation. The design of the structural joints meets the technical requirements of civil engineering. By rationally arranging the number of structural joints based on different actual environments, quality requirements are met while minimizing construction costs.

[0050] Because this utility model adopts a step-by-step construction method, it is constructed sequentially from top to bottom based on the filling zones. The second drainage ditch 3 is divided into sections of the second drainage ditch 31 that have been implemented during the zoning filling period and sections of the second drainage ditch 32 that are yet to be implemented during the zoning filling period. Similarly, the culvert blind ditch 5 is divided into sections of the culvert blind ditch 51 that have been implemented during the zoning filling period and sections of the culvert blind ditch 52 that are yet to be implemented during the zoning filling period. Figure 2 As shown, the completed parts are worked on first, and then the unfinished parts are worked on.

[0051] like Figure 2 As shown, the temporary intercepting drainage ditch 8 can be a temporarily excavated trench, with its inner wall shotcrete or a cement blanket laid to form a stable drainage channel. The temporary intercepting drainage ditch 8 is set up in layers according to the filling zone, and the temporary intercepting drainage ditch 8 is higher than the inlet position of the culvert blind ditch 5 of the filling zone, that is, the temporary intercepting drainage ditch 8 is arranged 1-2m above the filling platform of the zone, so that the water in the intercepting drainage ditch can be directed to the inlet of the culvert blind ditch 5 and the corresponding second intercepting drainage ditch 3 respectively.

[0052] like Figure 2 As shown, a retaining wall 6 is set at the bottom of the slag filling slope of the spoil disposal site 1. The retaining wall 6 can be a gravity retaining wall, which is mainly used to fix the slope toe of the spoil disposal site 1.

[0053] like Figure 2 As shown, an energy dissipation sedimentation tank 7 is provided on the side of the retaining wall 6 away from the spoil disposal site 1. The energy dissipation sedimentation tank 7 includes a concrete tank body 701 located on the side of the retaining wall 6, and energy dissipation stones 702 are laid at the bottom of the inner cavity of the concrete tank body 701. When the water from the spoil disposal site 1 flows into the energy dissipation sedimentation tank 7 at an angle, the velocity is relatively fast. The energy dissipation stones 702 laid at the bottom can improve the energy dissipation rate, and the energy dissipation of the water can effectively reduce the scouring of the ditch bed by the water flow.

[0054] like Figure 5As shown, the culvert blind drain 5 is composed of a corrugated pipe 502 and a reinforced concrete protective body 503. The top of the culvert section is equipped with a grate steel cover plate 9, which is higher than the top of the slag filling in the spoil heap 1 but lower than the first drainage ditch 2. After opening the grate steel cover plate 9, the culvert blind drain 5 can be used as a permanent backup drainage channel.

[0055] like Figure 5 As shown, an overflow gap 201 is provided on the side of the first drainage ditch 2 that is close to the culvert blind ditch 5. A concrete bottom protection 10 is provided on the outside of the overflow gap 201 of the first drainage ditch 2. When the water volume in the first drainage ditch 2 upstream of the spoil disposal site 1 is large, the excess water overflows through the overflow gap 201 into the culvert blind ditch 5 and is discharged, thereby improving the emergency response capability of the drainage system.

[0056] The specific construction procedures for the aforementioned spoil heap drainage system are as follows:

[0057] 1. Design the filling zones for the spoil disposal site 1, and distribute them from bottom to top according to the principle of first sparse and then dense. That is, the bottommost zone closest to the retaining wall 6 is the first layer of filling zone. When designing the filling zones, the horse walkway of spoil disposal site 1 can be used as a reference unit. For example, the first 2 / 3 can be divided into filling zones according to every two levels of horse walkway, and the last 1 / 3 can be divided into filling zones according to every level of horse walkway.

[0058] 2. Excavate the foundations of retaining wall 6, energy dissipation sedimentation tank 7 and the blind culvert 5 in the first filling zone, and carry out the construction of retaining wall 6, energy dissipation sedimentation tank and blind culvert 5 in the first filling zone;

[0059] Construct the second drainage ditch 3 within the first filling zone according to the planned filling structure of the spoil disposal site 1;

[0060] Based on the elevation of the first-level filling zone, a temporary top intercepting drainage ditch 8 is constructed and connected to the inlet of the culvert blind ditch 5 and the top of the second intercepting drainage ditch 3 to form the intercepting drainage system of the first-level filling zone.

[0061] 3. After the first layer of filling is filled to the top, seal the gap at the connection between the temporary intercepting drainage ditch 8 and the second intercepting drainage ditch 3 of the first layer of filling. Using the first layer of filling as a reference, start the intercepting drainage system of the second layer of filling and excavate and fill the second layer of filling. The completed and pending work during the construction process is detailed in the appendix. Figure 2 .

[0062] 4. After completing the construction of each filling zone from bottom to top, based on the height of the waste in the waste disposal site 1, after filling to the last expected zone, conduct a balance plan for the earthwork in the project area, estimate the remaining waste filling elevation, and use this elevation as a benchmark to design the permanent drainage system.

[0063] 5. Construct the first drainage ditch 2 at the top, the second drainage ditch 3 in the last filling section, and the culvert blind ditch 5. The inlet of the culvert blind ditch 5 extends to the top platform of the spoil heap 1, exposing the inlet of the blind ditch. An overflow gap 201 is reserved on the side of the first drainage ditch 2 near the culvert blind ditch 5. A concrete bottom protection 10 is set between the overflow gap 201 and the inlet of the culvert blind ditch 5. (Refer to Appendix) Figure 5 .

[0064] During the above construction process, the fill surface should maintain a certain drainage slope, with a longitudinal drainage slope of about 1% and a transverse drainage slope of not less than 2%. The third drainage ditch 4 should be constructed according to the slope walkway formation and implementation conditions. Figure 1 Construction will proceed at the location shown.

[0065] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A drainage system for a waste dump, comprising a waste dump (1) divided into sequentially ascending fill zones in cross section from low to high, characterized in that: The waste disposal site (1) has a first drainage ditch (2) on the outer side of the slag ring platform at the top of the waste body, a second drainage ditch (3) on both sides of the slag filling slope of the waste disposal site (1), a third drainage ditch (4) between the outer edges of the slag platform of the waste disposal site (1), a retaining wall (6) at the bottom of the slag filling slope of the waste disposal site (1), an energy dissipation sedimentation tank (7) on the side of the retaining wall (6) away from the waste disposal site (1), a pipe culvert blind ditch (5) in the waste of the waste disposal site (1), and a temporary drainage ditch (8) at the top of the waste disposal filling area of ​​the waste disposal site (1). The first drainage ditch (2), the second drainage ditch (3) and the third drainage ditch (4) are connected at the connection point. The temporary drainage ditch (8) is connected to the second drainage ditch (3) and the pipe culvert blind ditch (5). The culvert blind drain (5) includes a corrugated pipe (502), and the lower end of the corrugated pipe (502) penetrates the retaining wall (6). The outer wall of the corrugated pipe (502) is provided with a reinforced concrete protective body (503). The corrugated pipe (502) and the reinforced concrete protective body (503) form a culvert section. The bottom of the reinforced concrete protective body (503) is provided with a concrete cushion layer (501). The outside of the reinforced concrete protective body (503) is provided with a permeable rockfill layer (504). A transitional filter material layer (505) is provided between the permeable rockfill layer (504) and the waste disposal site (1).

2. A drainage system for a waste disposal site according to claim 1, wherein: The culvert blind ditch (5), the first intercepting drainage ditch (2), the second intercepting drainage ditch (3), the third intercepting drainage ditch (4), the retaining wall (6), and the energy dissipation sedimentation tank (7) constitute a permanent drainage system, while the first intercepting drainage ditch (2), the second intercepting drainage ditch (3), the third intercepting drainage ditch (4), the culvert blind ditch (5), and the temporary intercepting drainage ditch (8) constitute a temporary drainage system.

3. A drainage system for a waste disposal site according to claim 1, wherein: The reinforced concrete protective body (503) is located at the top and both sides of the corrugated pipe (502), and is connected to the permeable rockfill layer (504) by drainage pipes (506) at intervals.

4. A drainage system for a waste disposal site according to claim 1, wherein: The culvert blind drain (5) is provided with structural joints at certain intervals according to the foundation conditions. The spacing between the two sets of structural joints is positively correlated with the quality of the foundation conditions. The better the foundation conditions, the longer the spacing; the worse the foundation conditions, the shorter the spacing.

5. A drainage system for a waste disposal site according to claim 1, wherein: The culvert blind drain (5) is constructed in sections from low to high filling zones, and the top inlet of the culvert blind drain (5) is higher than the platform height of the filling zone.

6. A drainage system for a waste disposal site according to claim 1 wherein: The temporary intercepting drainage ditch (8) is set up in layers according to the filling zone, and the temporary intercepting drainage ditch (8) is higher than the inlet position of the blind culvert (5) of the filling zone.

7. A drainage system for a waste disposal site according to claim 1 wherein: The energy dissipation sedimentation tank (7) includes a concrete tank body (701) set on the side of the retaining wall (6), and the bottom of the inner cavity of the concrete tank body (701) is covered with energy dissipation stones (702).

8. A drainage system for a waste disposal site according to claim 1, wherein: The culvert blind drain (5) is composed of a corrugated pipe (502) and a reinforced concrete protective body (503). The top of the culvert section is equipped with a grate steel cover plate (9), and its height position is higher than the top of the slag filling in the spoil disposal site (1) and lower than the first drainage ditch (2).

9. A waste disposal site drainage system according to claim 1, characterized in that: An overflow gap (201) is provided on the side of the first intercepting drainage ditch (2) that is close to the culvert blind ditch (5), and a concrete bottom protection (10) is provided on the outside of the overflow gap (201) of the first intercepting drainage ditch (2).

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