Drainage system for filling area in pluvial area

Abstract

The utility model relates to the technical field of drainage systems, and discloses a drainage system for a filling area in a pluvial area, which comprises a drainage blind ditch arranged between the filling area and an undisturbed soil body and an intercepting ditch arranged on the periphery of the filling area, the lower end of the drainage blind ditch is communicated with the intercepting ditch, and the intercepting ditch is communicated with a municipal drainage system; the drainage blind ditch comprises a pipe ditch; the geotechnical cloth is laid in the pipe ditch, and the width of the geotechnical cloth is not smaller than the perimeter of the section of the pipe ditch; the gravel filling layer is arranged in the middle of the geotechnical cloth and is wrapped by the geotechnical cloth; the water guide pipe is arranged in the gravel filling layer in the length direction, and a plurality of water permeable holes are formed in the upper portion of the pipe wall; and the broken stone hardcore is laid above the pipe ditch. According to the drainage system for the filling area of the pluvial area, drainage operation of the filling area of the pluvial area can be achieved with low cost and work amount.

Description

Technical Field

[0001] This utility model relates to the field of drainage system technology, specifically to a drainage system for fill areas in rainy regions. Background Technology

[0002] In the process of backfilling and compaction of hillsides in rainy areas, repeated excavation of ditches and collection wells for drainage is often used, waiting for the soil to dry naturally in sunny weather. When implementing measures such as setting up reinforced concrete drainage ditches, repeated construction is required, resulting in a large workload, high cost, and long construction period. Utility Model Content

[0003] This utility model was made to solve the above-mentioned technical problems. One of its objectives is to provide a drainage system for fill areas in rainy regions, which can achieve drainage operations in fill areas in rainy regions with lower cost and less engineering work.

[0004] According to one embodiment of this utility model, a drainage system for fill areas in rainy regions is provided, comprising a drainage blind ditch disposed between the fill area and the undisturbed soil and a intercepting ditch disposed around the perimeter of the fill area. The lower end of the drainage blind ditch is connected to the intercepting ditch, which is connected to a municipal drainage system. The drainage blind ditch comprises: a pipe trench; geotextile laid in the pipe trench, with a width not less than the cross-sectional perimeter of the pipe trench; a gravel filling layer disposed in the middle of the geotextile and wrapped by the geotextile; a water guide pipe disposed along its length within the gravel filling layer, with several permeable holes on the upper part of the pipe wall; and a gravel cushion layer laid above the pipe trench.

[0005] As one embodiment, the water pipe is covered with a nylon mesh with a mesh count greater than 80.

[0006] As one implementation, the geotextile is a permeable geotextile.

[0007] In one embodiment, the distance between the water guide pipe and the bottom surface of the trench is not less than 150mm.

[0008] As one embodiment, the particle size of the crushed stone in the crushed stone filling layer is 25-40mm; in the trench, the compaction degree of the crushed stone within the same height range as the water guide pipe is not less than 95%, the compaction degree of the crushed stone within the range of 500mm high and 2m wide above the water guide pipe is not less than 85%, and the compaction degree of the crushed stone in the remaining part of the trench is not less than 90%.

[0009] As one implementation, the trench is provided with two water guide pipes.

[0010] In one embodiment, the water guide pipe is an HDPE steel strip wound reinforced pipe, and the water permeable holes are located between the pipe ribs of the HDPE steel strip wound reinforced pipe; the water permeable holes are arranged in a quincunx pattern on the water guide pipe, with a hole diameter of 10mm and a hole spacing of 125mm.

[0011] As one embodiment, the thickness of the crushed stone cushion layer is not less than 300mm, the compaction degree is not less than 90%, and the width of both sides extending beyond the trench is not less than 500mm.

[0012] In one embodiment, the intercepting ditch includes: a ditch body, which is a U-shaped channel formed by masonry; geotextile, which is laid in the ditch body; and a crushed stone filling layer, which is filled in the geotextile and wrapped by the geotextile, with the top layer forming an inclined slope.

[0013] As one implementation, the slopes on both sides of the top layer of the intercepting ditch are provided with a cement mortar protective surface with a thickness of not less than 10 mm and a width of not less than 500 mm.

[0014] Based on the above description and practical application, the drainage system for backfill areas in rainy regions described in this utility model, through the combination of drainage blind ditches and intercepting ditches, can be applied during the dynamic compaction construction of backfilled hillsides in rainy areas. It can control and drain rainwater washed down from the hillside during the rainy season and rainwater intruding into the backfill area, ensuring the quality of backfilling and dynamic compaction, soil stability, and preventing rainwater erosion and soil loss. This drainage system for backfilled areas in rainy regions is easy to construct and uses common consumable materials, resulting in relatively low costs. Attached Figure Description

[0015] Figure 1 This is a top view of a drainage system for a rainy area fill zone, as described in one embodiment of the present invention.

[0016] Figure 2 This is a cross-sectional view of a drainage system in a rainy area fill zone, as described in one embodiment of this utility model.

[0017] Figure 3 This is a cross-sectional schematic diagram of a drainage blind ditch in a fill-in area drainage system in a rainy region, according to one embodiment of this utility model.

[0018] Figure 4 This is a cross-sectional schematic diagram of the intercepting ditch in the drainage system of the fill area in a rainy region, according to one embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the water pipe structure in a drainage system for a rainy area fill zone, as described in one embodiment of this utility model.

[0020] Figure 6This is a compaction distribution diagram of the gravel filling layer in the drainage blind ditch of the soil-filled area in a rainy region drainage system according to one embodiment of this utility model.

[0021] The attached figures are labeled as follows:

[0022] 1. Original soil; 2. Filled area; 3. Geotextile; 4. Drainage pipe; 5. Crushed stone filling layer; 6. Crushed stone cushion layer; 7. Permeable hole; 8. Protective surface; 9. Drainage blind ditch; 10. Intercepting ditch; 11. Ditch body. Detailed Implementation

[0023] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0024] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. It should be noted that in this disclosure, the terms "comprising," "configured with," and "set in" are used to indicate an open-ended inclusion, meaning that additional elements / components / etc. may exist besides those listed; the terms "first," "second," etc., are used only as labels and are not intended to limit the number or order of objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] like Figures 1 to 6As shown in this embodiment, a drainage system for backfill areas in rainy regions is disclosed. This system can be applied to the backfill and dynamic compaction construction process in rainy regions to control and drain rainwater washed down from the mountains during the rainy season and rainwater intruding into the backfill area 2, thereby ensuring the quality of backfilling and dynamic compaction construction in the backfill area 2 and the stability of the soil, and preventing rainwater from eroding the soil and causing soil and water loss.

[0027] The drainage system for the fill area in this rainy region includes a drainage blind ditch 9 and an intercepting ditch 10. The drainage blind ditch 9 is located between the fill area 2 and the original soil body 1, and the intercepting ditch 10 is located on the outer perimeter of the fill area 2. The lower end of the drainage blind ditch 9 is connected to the intercepting ditch 10, which is connected to the municipal drainage system. This system can drain rainwater that intrudes into the fill area 2 and rainwater that washes down from the hillside, preventing rainwater from eroding and intruding into the original soil body 1. After rain, the soil can be quickly drained, achieving the conditions for backfilling and dynamic compaction.

[0028] Specifically, please combine Figure 3 The drainage blind ditch 9 includes a trench, geotextile 3, a water-conducting pipe 4, a gravel filling layer 5, and a gravel cushion layer 6. The trench has a U-shaped cross-section and can be formed by excavating downwards from the surface of the undisturbed soil 1. The geotextile 3 is laid in the trench and adheres to the bottom and walls of the trench; the width of the geotextile 3 is not less than the perimeter of the trench cross-section. The gravel filling layer 5 is placed on and wrapped by the geotextile 3. The water-conducting pipe 4 is installed longitudinally within the gravel filling layer 5, and several permeable holes 7 are provided on the upper part of the pipe wall. The gravel cushion layer 6 is laid on top of the trench.

[0029] When constructing the drainage blind ditch 9, firstly, a trench is excavated downwards on the surface of the original soil 1 to form a pipe trench. Geotextile 3 is laid in the pipe trench to fit the bottom and walls of the trench. Then, some crushed stone is backfilled as a cushion layer for the water pipe 4. The water pipe 4 is placed on the cushion layer, and then the pipe trench is filled with crushed stone. All the crushed stone located around the water pipe 4 in the pipe trench constitutes the crushed stone filling layer 5. The surface of the crushed stone filling layer 5 is covered by geotextile 3 extending to the outside of the trench wall, wrapping the crushed stone in the entire pipe trench. Finally, a crushed stone cushion layer 6 is laid on the geotextile 3 above the pipe trench to form the drainage blind ditch 9.

[0030] The drainage ditch 9 is located at a point where contour lines are dense, which is the rainwater gully area on the mountain surface. It is used to drain rainwater that intrudes into the soil during the rainy season and rainwater that washes down from the mountainside, preventing rainwater from eroding and intruding into the original soil 1. After rain, the soil can be quickly drained, making it possible to backfill and compact the soil.

[0031] As one implementation method, the geotextile 3 is a permeable geotextile, and a geotextile of 400g / ㎡ can be used. This allows rainwater that has penetrated the soil to pass through the geotextile 3 into the drainage ditch 9 and be discharged through the water pipe 4. At the same time, it can also prevent soil particles from entering the drainage ditch 9, causing blockage downstream of the water pipe 4, water and soil loss, and affecting the backfilling and compaction quality of the filling area 2.

[0032] As one implementation method, such as Figure 5 As shown, the water conduit 4 is an HDPE steel-reinforced pipe, and the permeable holes 7 are located between the ribs of the HDPE steel-reinforced pipe. The permeable holes 7 are arranged in a quincunx pattern on the water conduit 4, with a diameter of 10 mm and a spacing of 125 mm. The specific hole diameter and spacing can be calculated and determined based on rainfall and flash flood flow, facilitating rainwater intrusion into the soil to enter the water conduit 4 through the permeable holes 7 and be discharged.

[0033] As one implementation method, the distance between the HDPE steel-reinforced pipe and the bottom of the trench should be no less than 150mm. This serves two purposes: firstly, the crushed stone below the water guide pipe 4 protects it during dynamic compaction; secondly, rainwater that fails to enter the water guide pipe 4 can be buffered within this range, preventing it from completely infiltrating the original soil 1 in a short time. Installing two HDPE steel-reinforced pipes in the trench, compared to installing a single water guide pipe 4, allows for a reduced pipe diameter while still meeting the drainage rate requirements, preventing damage to the pipe caused by backfilling and dynamic compaction. The ring stiffness of the water guide pipe 4 should be no less than SN12.5, ensuring long-term stable use without deformation.

[0034] As an example, the HDPE steel strip-wound reinforced pipe is wrapped with a fine nylon mesh with a mesh size of not less than 80 to further prevent soil particles from entering the water pipe 4 through the permeable holes 7 with rainwater, causing blockage downstream of the water pipe 4, soil erosion, and affecting the backfilling and compaction quality of the filling area 2.

[0035] As an example, the crushed stone filling layer 5 consists of well-graded crushed stone with a particle size of 25-40mm. During the construction of this crushed stone filling layer 5, the crushed stone is manually compacted. The compaction degree of the crushed stone within the same height range as the HDPE steel-reinforced pipe should be no less than 95%. The compaction degree of the crushed stone within a 500mm height range above the HDPE steel-reinforced pipe and extending 1m beyond the pipe on both sides (i.e., within a 2m range above the HDPE steel-reinforced pipe) should be no less than 85%. The compaction degree of the crushed stone in the remaining portion of the trench should be no less than 90%. Under these conditions, the drainage blind ditch 9 has a relatively stable structure and good drainage performance.

[0036] As an example, the thickness of the crushed stone cushion layer 6 is not less than 300mm, the compaction degree is not less than 90%, the width of both sides extending beyond the pipe trench is not less than 500mm, and a cushion layer is set above the drainage blind ditch 9 to protect the drainage blind ditch 9 from damage during the backfilling and dynamic compaction of the soil above it.

[0037] As an example, the intercepting ditch 10 is ring-shaped along the ground surface, surrounding the fill area 2 and connected to the municipal drainage system. It intercepts rainwater flowing down from higher elevations of the hillside, preventing the fill area 2 from being soaked and affecting the backfilling and compaction quality. The intercepting ditch 10 includes a ditch body 11, geotextile 3, and a gravel filling layer 5. The ditch body 11 is a U-shaped channel formed by masonry. During construction, the channel is first excavated downwards, and then the bottom and walls are constructed using masonry of at least M7.5 MU30. The geotextile 3 is laid in the ditch body 11 and adheres to the bottom and walls. The gravel filling layer 5 consists of gravel filled within and wrapped by the geotextile 3, with its top layer forming a sloping surface. The intercepting ditch 10 is connected to the drainage blind ditch 9 via a gravel channel to drain rainwater from the drainage blind ditch 9, ensuring unobstructed drainage.

[0038] As an example, the slopes on both sides of the top layer of the intercepting ditch 10 are provided with a cement mortar protective surface 8 with a thickness of not less than 10 mm and a width of not less than 500 mm. It is made of 1:2 cement mortar and can effectively protect the intercepting ditch 10.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A drainage system for fill areas in rainy regions, characterized in that, It includes a drainage blind ditch set between the fill area and the original soil and a water interception ditch set around the perimeter of the fill area. The lower end of the drainage blind ditch is connected to the water interception ditch, and the water interception ditch is connected to the municipal drainage system. The drainage blind ditch includes: Pipe trench; Geotextile, laid in the trench, with a width not less than the cross-sectional perimeter of the trench; The crushed stone filling layer is placed in the middle of the geotextile and is wrapped by the geotextile; A water pipe is installed along its length within the gravel filling layer, and several water-permeable holes are provided on the upper part of the pipe wall. A crushed stone bedding layer is laid on top of the pipe trench.

2. The drainage system for fill areas in rainy regions as described in claim 1, characterized in that, The water pipe is covered with a nylon mesh with a mesh count greater than 80.

3. The drainage system for fill areas in rainy regions as described in claim 1, characterized in that, The geotextile is a permeable geotextile.

4. The drainage system for fill areas in rainy regions as described in claim 1, characterized in that, The distance between the water guide pipe and the bottom surface of the trench shall not be less than 150mm.

5. The drainage system for fill areas in rainy regions as described in claim 4, characterized in that, The particle size of the crushed stone in the crushed stone filling layer is 25-40 mm; In the trench, the compaction degree of the crushed stone within the same height range as the water guide pipe is not less than 95%, the compaction degree of the crushed stone within the upper 500mm and 2m range of the water guide pipe is not less than 85%, and the compaction degree of the crushed stone in the remaining part of the trench is not less than 90%.

6. The drainage system for fill areas in rainy regions as described in claim 1, characterized in that, Two water guide pipes are installed inside the trench.

7. The drainage system for fill areas in rainy regions as described in claim 1, characterized in that, The water guide pipe is an HDPE steel strip wound reinforced pipe, and the water permeable holes are located between the pipe ribs of the HDPE steel strip wound reinforced pipe. The permeable holes are arranged in a quincunx pattern on the water guide pipe, with a hole diameter of 10mm and a hole spacing of 125mm.

8. The drainage system for fill areas in rainy regions as described in claim 1, characterized in that, The thickness of the crushed stone bedding layer shall not be less than 300 mm, the compaction degree shall not be less than 90%, and the width of both sides extending beyond the trench shall not be less than 500 mm.

9. The drainage system for fill areas in rainy regions as described in claim 8, characterized in that, The intercepting ditch includes: The trench is a U-shaped channel formed by masonry. Geotextile is laid in the trench; The crushed stone filling layer is filled in the geotextile and wrapped by the geotextile, with the top layer forming an inclined slope.

10. The drainage system for fill areas in rainy regions as described in claim 1, characterized in that, The slopes on both sides of the top layer of the intercepting ditch are provided with a cement mortar protective surface with a thickness of not less than 10 mm and a width of not less than 500 mm.

Images