Post-membrane drainage structure suitable for geomembrane seepage prevention

Abstract

The post-membrane drainage structure comprises first drainage ditches formed in a foundation layer with a certain gradient in the length direction of the post-membrane drainage structure, the multiple first drainage ditches are arranged at intervals, and the multiple first drainage ditches extend from the slope top of the foundation layer to the slope bottom of the foundation layer; a first seepage and drainage blind pipe is arranged in the first drainage ditch, the outer diameter of the first drainage blind pipe is smaller than the width of the first drainage ditch, and the first seepage and drainage blind pipe is wrapped with geotechnical cloth; a second drainage ditch is horizontally arranged in the base layer slope bottom end, a second seepage and drainage blind pipe is arranged in the second drainage ditch and wrapped with geotechnical cloth, a water collecting well is arranged at one corner of the base layer slope bottom, the second drainage ditch is communicated with the water collecting well, and a water pump is arranged in the water collecting well. Soil particles and impurities in seepage water are filtered through the geotechnical cloth wrapping the first seepage and drainage blind pipe and the second seepage and drainage blind pipe, and the problem that the drainage effect is affected due to blockage of the seepage holes in the drainage pipeline is effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of water conservancy and hydropower, and in particular to a post-membrane drainage structure suitable for geomembrane anti-seepage. Background Art

[0002] Geomembrane is a geotechnical anti-seepage material made of plastic film as the anti-seepage base material and non-woven fabric. The anti-seepage performance of the new material geomembrane mainly depends on the anti-seepage performance of the plastic film. The plastic films used for anti-seepage applications at home and abroad mainly include polyvinyl chloride (PVC), polyethylene (PE), EVA (ethylene / vinyl acetate copolymer), and ECB (ethylene vinyl acetate modified asphalt blended geomembrane) is also designed for use in tunnel applications. They are a kind of polymer chemical flexible material with a small specific gravity, strong elongation, high deformation adaptability, corrosion resistance, low temperature resistance, and good antifreeze performance.

[0003] In the related art, a Chinese patent with application number CN202322048132.9 proposes a sub-membrane drainage device suitable for geomembrane anti-seepage, including an anti-seepage layer and a sub-membrane flow channel buried underground, the top of the sub-membrane flow channel is flush with the ground surface, the sub-membrane flow channel is filled with drainage filter material, there are multiple sub-membrane flow channels, the sub-membrane flow channels are arranged in a tic-tac-toe pattern, a drainage pipe is arranged inside the sub-membrane flow channel, the drainage pipe is buried in the drainage filter material, the drainage pipe includes a connecting pipe, there are multiple connecting pipes, and the multiple connecting pipes are arranged in a tic-tac-toe pattern. The utility model is suitable for a sub-membrane drainage device for geomembrane anti-seepage, and the drainage efficiency can be improved by arranging the sub-membrane flow channels arranged in a tic-tac-toe pattern. When there is a lot of local seepage, it can be dispersed along the sub-membrane flow channel to reduce local water accumulation. In addition, the drainage filter material filled inside can filter the soil particles in the infiltrated water to prevent the soil particles from clogging the drainage pipe, which is easy to maintain.

[0004] The above-mentioned related technologies have the following defects: the flow channel under the membrane is filled with drainage filter material and a drainage pipe with a number of seepage holes is buried in the seepage holes. Although the soil particles in the infiltrated water can be filtered, in some cases, due to the uneven pore distribution of the drainage filter material, impurities and soil particles may penetrate the drainage filter material and block the seepage holes on the drainage pipe; and as time goes by, the drainage filter material will be gradually compacted due to water scouring and the accumulation of impurities and soil particles, resulting in blockage of the seepage holes on the drainage pipe, thereby affecting the drainage effect. Utility Model Content

[0005] In order to improve the problem that the seepage holes on the drainage pipe are blocked and affect the drainage effect, the present application provides a post-membrane drainage structure suitable for geomembrane anti-seepage.

[0006] The present application provides a drainage structure behind the geomembrane suitable for anti-seepage of geomembrane, which adopts the following technical solution:

[0007] A post-membrane drainage structure suitable for geomembrane anti-seepage, including a first drainage ditch opened in a base layer with a certain slope along its length direction. A plurality of the first drainage ditches are arranged at intervals, and the plurality of the first drainage ditches extend from the top of the slope of the base layer to the bottom of the slope of the base layer. A first drainage blind pipe is arranged in the first drainage ditch. The outer diameter of the first drainage blind pipe is smaller than the width of the first drainage ditch, and the first drainage blind pipe is wrapped with geotextile;

[0008] A second drainage ditch is horizontally arranged in the bottom end of the slope of the base layer. A second drainage blind pipe is arranged in the second drainage ditch. The second drainage blind pipe is wrapped with geotextile. A sump is arranged at a corner of the bottom of the slope of the base layer. The second drainage ditch is communicated with the sump, and a water pump is arranged in the sump.

[0009] Furthermore, the first drainage ditch includes a left inclined part and a right inclined part. The plurality of the left inclined parts and the plurality of the right inclined parts divide the base layer into a grid shape, and the upper included angle between the left inclined part and the right inclined part is an acute angle.

[0010] Furthermore, an inclined four-way pipe fitting is connected between four alternately connected first drainage blind pipes, and a straight-through pipe fitting is connected between two butt-jointed second drainage blind pipes.

[0011] Furthermore, fixing screws along its radial direction are threadedly penetrated through the four ends of the inclined four-way pipe fitting. One end of the first drainage blind pipe is inserted into one end of the inclined four-way pipe fitting and abuts against the fixing screw; fixing screws along its radial direction are threadedly penetrated through the two ends of the straight-through pipe fitting. One end of the second drainage blind pipe is inserted into one end of the straight-through pipe fitting and abuts against the fixing screw.

[0012] Furthermore, the geotextile is in a cylindrical shape, and the inner diameter of the cylindrical shape is adapted to the outer diameters of the first drainage blind pipe and the second drainage blind pipe.

[0013] Furthermore, the slope of the base layer along its length direction is one-thousandth to two-thousandths.

[0014] Furthermore, the second drainage ditch has a slope of one-thousandth along its length direction, and the bottom end of the slope of the second drainage ditch is communicated with the sump.

[0015] In summary, the beneficial technical effects of this application are:

[0016] When water seeps out behind the geomembrane, the seepage water will enter the first drainage ditch and the second drainage ditch, and then filter the soil particles and impurities in the seepage water through the geotextile wrapped around the first drainage and drainage blind pipe and the second drainage and drainage blind pipe. Then, the filtered seepage water finally converges into the sump through the first drainage and drainage blind pipe and the second drainage and drainage blind pipe. And because the base layer has a certain slope along its length direction and the first drainage ditch extends from the top of the slope to the bottom of the slope, the seepage water in the base layer can be quickly discharged from the top of the base layer slope to the bottom of the base layer slope through the first drainage and drainage blind pipe, preventing the occurrence of water accumulation. This design helps to keep the base layer dry and reduce the erosion and damage of the base layer by water. Finally, the seepage water converged in the sump is pumped out by the water pump in the sump. It can effectively avoid the problem that the drainage filter material is gradually compacted due to the long-term scouring of water flow and the accumulation of impurities and soil particles, resulting in the blockage of the seepage holes on the drainage pipe and affecting the drainage effect. Brief Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0018] Description of the reference numerals: 1, base layer; 2, first drainage ditch; 21, left inclined part; 22, right inclined part; 23, first drainage and drainage blind pipe; 24, inclined four-way pipe fitting; 241, fixing screw; 3, geotextile; 4, second drainage ditch; 41, second drainage and drainage blind pipe; 411, straight-through pipe fitting; 5, sump; 51, water pump. Detailed Embodiment

[0019] The technical solutions of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0020] An embodiment of the present application discloses a post-membrane drainage structure suitable for geomembrane anti-seepage. Refer to Figure 1 , a post-membrane drainage structure suitable for geomembrane anti-seepage includes a first drainage ditch 2 opened in a base layer 1 having a certain slope along its length direction. Specifically, the first drainage ditch 2 and the base layer 1 are horizontally arranged. A plurality of first drainage ditches 2 are arranged at intervals and extend from the top of the base layer 1 slope to the bottom of the base layer 1 slope. A first drainage and drainage blind pipe 23 is arranged in the first drainage ditch 2. The outer diameter of the first drainage and drainage blind pipe 23 is smaller than the width of the first drainage ditch 2. The first drainage and drainage blind pipe 23 is wrapped with a geotextile 3;

[0021] A second drainage ditch 4 is horizontally arranged inside the bottom end of the slope of the base layer 1. A second drainage and seepage blind pipe 41 is arranged inside the second drainage ditch 4. The second drainage and seepage blind pipe 41 is wrapped with a geotextile 3. A sump 5 is arranged at one corner of the bottom of the slope of the base layer 1. The second drainage ditch 4 is communicated with the sump 5. A water pump 51 is arranged inside the sump 5.

[0022] When water seeps out behind the geomembrane, the seepage water will enter the first drainage ditch 2 and the second drainage ditch 4, and then filter the soil particles and impurities in the seepage water through the geotextile 3 wrapped outside the first drainage and seepage blind pipe 23 and the second drainage and seepage blind pipe 41. Then the filtered seepage water finally converges into the sump 5 through the first drainage and seepage blind pipe 23 and the second drainage and seepage blind pipe 41. And because the base layer 1 has a certain slope along its length direction and the first drainage ditch 2 extends from the top of the slope to the bottom of the slope, the seepage water in the base layer 1 can be quickly discharged from the top of the slope of the base layer 1 to the bottom of the slope of the base layer 1 through the first drainage and seepage blind pipe 23, preventing the occurrence of water accumulation phenomenon. This design helps to keep the base layer 1 dry and reduces the erosion and damage of water to the base layer 1. Finally, the seepage water converged into the sump 5 is pumped out by the water pump 51 in the sump 5. It can effectively avoid the problem that the drainage filter material is gradually compacted due to the long-term scouring of water flow and the accumulation of impurities and soil particles, resulting in the blockage of the seepage holes on the drainage pipeline and affecting the drainage effect.

[0023] Specifically, referring to Figure 1 , the first drainage ditch 2 includes a left inclined part 21 and a right inclined part 22. A plurality of left inclined parts 21 and a plurality of right inclined parts 22 divide the base layer 1 into a grid shape, and the upper included angle between the left inclined part 21 and the right inclined part 22 is an acute angle. Such a setting can effectively utilize the slope of the base layer 1 to realize the rapid guidance and discharge of seepage water, improve the drainage efficiency of seepage water, and reduce the local water accumulation phenomenon.

[0024] Moreover, referring to Figure 1 , an inclined four-way pipe fitting 24 is connected between four first drainage and seepage blind pipes 23 connected in an alternating manner, and a straight-through pipe fitting 411 is connected between two second drainage and seepage blind pipes 41 connected in butt joint.

[0025] Fixing screws 241 along its radial direction are threadedly penetrated through the four end heads of the inclined four-way pipe fitting 24. One end of the first drainage and seepage blind pipe 23 is inserted into one of the end heads of the inclined four-way pipe fitting 24 and abuts against the fixing screw 241; fixing screws 241 along its radial direction are threadedly penetrated through the two end heads of the straight-through pipe fitting 411. One end of the second drainage and seepage blind pipe 41 is inserted into one of the end heads of the straight-through pipe fitting 411 and abuts against the fixing screw 241.

[0026] Such installation is simple, the connection is stable and the connection sealing performance is good, ensuring the smooth connection between the first drainage and seepage blind pipes 23 and between the second drainage and seepage blind pipes 41, enabling the seepage water to be quickly discharged and improving the discharge efficiency of the seepage water.

[0027] And, referring to Figure 1 , the geotextile 3 is in a tubular shape, and the inner diameter of the tubular shape is adapted to the outer diameters of the first drainage blind pipe 23 and the second drainage blind pipe 41. This makes the installation of the geotextile 3 simpler and more convenient and forms an integral structure between the geotextile 3 and the first drainage blind pipe 23 and the second drainage blind pipe 41, thereby having better sealing performance and stability and improving the stability of the entire drainage structure.

[0028] In addition, referring to Figure 1 , the slope of the base layer 1 in its length direction is one-thousandth to two-thousandths. Such a slope is relatively easy to achieve in actual construction and can not only ensure the drainage effect but also ensure the stability of the structure.

[0029] Meanwhile, referring to Figure 1 , the second drainage ditch 4 has a slope of one-thousandth in its length direction, and correspondingly, the second drainage blind pipe 41 has a slope of one-thousandth in its length direction, and the bottom end of the slope of the second drainage ditch 4 is communicated with the catch basin 5. Such a small slope change can effectively guide the seepage water into the catch basin 5 without affecting the structural stability, improving the discharge efficiency of the seepage water.

[0030] The implementation principle of the membrane-back drainage structure applicable to geomembrane anti-seepage in the embodiment of the present application is as follows:

[0031] When seepage water appears behind the geomembrane, the seepage water will enter the first drainage ditch 2 and the second drainage ditch 4, and then the soil particles and impurities in the seepage water will be filtered by the geotextile 3 wrapped outside the first drainage blind pipe 23 and the second drainage blind pipe 41. Then, the filtered seepage water will finally converge into the catch basin 5 through the first drainage blind pipe 23 and the second drainage blind pipe 41. And because the base layer 1 has a certain slope in its length direction and the first drainage ditch 2 extends from the top of the slope to the bottom of the slope, the seepage water in the base layer 1 can quickly be discharged from the top of the slope of the base layer 1 to the bottom of the slope of the base layer 1 through the first drainage blind pipe 23, preventing the occurrence of water accumulation. This design helps to keep the base layer 1 dry and reduces the erosion and damage of the base layer 1 by water. Finally, the seepage water converged into the catch basin 5 is pumped out by the water pump 51 in the catch basin 5. It can effectively avoid the problem that the drainage filter material is gradually compacted due to the long-term scouring of the water flow and the accumulation of impurities and soil particles, resulting in the blockage of the seepage holes on the drainage pipe and affecting the drainage effect.

[0032] Unless otherwise defined, the technical terms or scientific terms used in this application shall have the ordinary meanings as understood by those of ordinary skill in the art to which this application pertains. The terms "first", "second", "third" and similar terms used in the specification and claims of this application do not denote any order, quantity or importance, but are only used to distinguish different components. Similar terms such as "a" or "an" do not denote a quantity limitation, but rather denote the presence of at least one. Similar terms such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. Terms such as "upper", "lower", "left" and "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0033] The above are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of this application shall be covered within the protection scope of this application.

Claims

1. A drainage structure behind the membrane suitable for geomembrane anti-seepage, characterized in that: The invention comprises a first drainage ditch (2) provided in a foundation layer (1) with a certain slope along its length direction, a plurality of the first drainage ditches (2) are arranged at intervals and the plurality of the first drainage ditches (2) extend from the top of the foundation layer (1) to the bottom of the foundation layer (1), a first seepage drainage blind pipe (23) is arranged in the first drainage ditch (2), the outer diameter of the first seepage drainage blind pipe (23) is smaller than the width of the first drainage ditch (2), and the first seepage drainage blind pipe (23) is wrapped with a geotextile (3); A second drainage ditch (4) is horizontally arranged at the bottom end of the slope of the foundation layer (1), a second seepage drainage blind pipe (41) is arranged in the second drainage ditch (4), and the second seepage drainage blind pipe (41) is wrapped with a geotextile (3). A water collection well (5) is arranged at a corner of the bottom end of the slope of the foundation layer (1), the second drainage ditch (4) is connected to the water collection well (5), and a water pump (51) is arranged in the water collection well (5).

2. A membrane back-drainage structure suitable for geomembrane anti-seepage according to claim 1, characterized in that: The first drainage ditch (2) comprises a left oblique portion (21) and a right oblique portion (22), wherein a plurality of the left oblique portions (21) and a plurality of the right oblique portions (22) divide the base layer (1) into a grid shape, and an upper angle between the left oblique portion (21) and the right oblique portion (22) is an acute angle.

3. The drainage structure behind the membrane suitable for geomembrane anti-seepage according to claim 2, characterized in that: An oblique four-way pipe fitting (24) is connected between the four staggered first seepage drainage blind pipes (23), and a straight pipe fitting (411) is connected between the two butt-jointed second seepage drainage blind pipes (41).

4. The drainage structure behind the membrane suitable for geomembrane anti-seepage according to claim 3, characterized in that: The four ends of the oblique four-way pipe fitting (24) are all threadedly penetrated with fixing screws (241) along the radial direction thereof; one end of the first seepage drainage blind pipe (23) is plugged into one of the ends of the oblique four-way pipe fitting (24) and is tightly pressed against the fixing screw (241); the two ends of the straight pipe fitting (411) are all threadedly penetrated with fixing screws (241) along the radial direction thereof; one end of the second seepage drainage blind pipe (41) is plugged into one of the ends of the straight pipe fitting (411) and is tightly pressed against the fixing screw (241).

5. The drainage structure behind the membrane suitable for geomembrane anti-seepage according to claim 1, characterized in that: The geotextile (3) is cylindrical, and its inner diameter is adapted to the outer diameters of the first seepage drainage blind pipe (23) and the second seepage drainage blind pipe (41).

6. The drainage structure behind the membrane suitable for geomembrane anti-seepage according to claim 1, characterized in that: The slope of the base layer (1) along its length direction is 1 / 1000 to 2 / 1000.

7. The drainage structure behind the membrane suitable for geomembrane anti-seepage according to claim 1, characterized in that: The second drainage ditch (4) has a slope of one thousandth along its length, and the bottom end of the slope of the second drainage ditch (4) is connected to the water collection well (5).

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