Reverse drainage pipe device

Abstract

The present invention discloses a reverse filtration drainage pipe device, comprising a drainage pipe, a bagged gravel bag, reverse filtration sand and gravel, and an outlet baffle. The drainage pipe is arranged in a drainage hole of a bank wall, the bagged gravel bag is arranged on one side of the interior of the drainage pipe, the reverse filtration sand and gravel are arranged on the other side of the interior of the drainage pipe and are adjacent to the bagged gravel bag, and the outlet baffle is arranged at the outlet end of the drainage pipe and presses the reverse filtration sand and gravel. The present invention is easy to manufacture, process and install, and the required parts are all standard products or common building materials, which are easy to obtain and low in cost. It can be used for replacement and maintenance of reverse filtration drainage. When the reverse filtration drainage of the bank wall fails, it only needs to be re-drilled at the original position or nearby, and the device can be pressed into the drilled hole as a whole to complete the maintenance. It can also be used for new construction projects. During the revetment construction, it can be directly poured into the bank wall, and the backfill of the soil behind the bank wall is not easy to affect or damage the present invention.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy engineering, and in particular to a reverse filtration drainage pipe device. Background Art

[0002] In the prior art, drainage pipes and filter layers are set at certain intervals and elevations on the bank wall in water conservancy projects to drain the water behind the bank wall, so as to prevent the bank wall from becoming unstable or causing seepage damage due to excessive water behind the wall. In actual applications, some drainage holes fail to drain due to reasons such as irregular construction of the filter layer, the filter layer detaching from the drainage hole during backfill or with soil settlement, and the filter layer being blocked. The water behind the wall cannot be effectively discharged or soil loss occurs, causing the wall to become unstable or cause seepage damage. When it is found that the drainage and filtration of the drainage hole fails, the conventional practice is to excavate the backfill behind the drainage hole wall and re-install the filter layer. This method is labor-intensive, time-consuming, and expensive, and there is also a risk of damage to the bank wall structure during construction.

[0003] Technicians in this technical field are committed to solving the above-mentioned technical defects. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the technical purpose of the present invention is to solve the problems mentioned in the above-mentioned background technology.

[0005] In order to achieve the above technical objectives, the present invention provides a reverse filter drainage pipe device, comprising a drainage pipe, a bagged gravel bag, reverse filter sand and gravel materials, and a water outlet baffle, wherein the drainage pipe is arranged in a drainage hole of a bank wall, the bagged gravel bag is arranged on one side of the interior of the drainage pipe, the reverse filter sand and gravel materials are arranged on the other side of the interior of the drainage pipe and are adjacent to the bagged gravel bag, and the water outlet baffle is arranged at the outlet end of the drainage pipe and presses the reverse filter sand and gravel materials;

[0006] The drainage pipe is provided with a plurality of holes on a portion of the pipe wall located on the bagged gravel bag and on the water outlet baffle.

[0007] Preferably, the drain pipe is composed of a hollow pipe and a cone head, the water outlet baffle is arranged at the water outlet end of the hollow pipe, and the cone head is arranged at the water inlet end of the hollow pipe.

[0008] Preferably, the water outlet baffle, the hollow tube and the cone head are an integrated structure.

[0009] Preferably, the bagged gravel bag consists of a geotextile bag and gravel, and the gravel is arranged inside the geotextile bag.

[0010] Preferably, the geotextile bag is cylindrical and fits closely to the inner wall of the drainage pipe.

[0011] Preferably, the diameter of the holes on the water outlet baffle is smaller than the diameter of the stones in the reverse filter sand and stone material.

[0012] Beneficial effects of the present invention:

[0013] Due to the above structural design, the present invention has the following advantages:

[0014] (1) Easy to manufacture, process and install. The required parts are all standard products or common building materials, which are easy to obtain and low in cost.

[0015] (2) It can be used for replacement and maintenance of the anti-filtration drainage. When the anti-filtration drainage of the quay wall fails, it is only necessary to drill a hole again at the original location or nearby, and press the entire device into the hole to complete the maintenance.

[0016] (3) It can also be used in new construction projects. During the revetment construction, it can be directly poured into the bank wall. The backfill of the soil behind the bank wall is not likely to affect or damage the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the plane structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0019] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0020] Figure 4 It is a structural schematic diagram of the drainage pipe in the present invention;

[0021] Figure 5 It is a schematic diagram of the structure of the water outlet baffle in the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of the present invention installed on the shore wall;

[0023] Figure 7 for Figure 6 The enlarged structural diagram at B in the middle;

[0024] Figure 8 This is a schematic diagram of the structure of the bank wall in the present invention with drainage holes;

[0025] Fig. 9 It is the installation schematic diagram of the present invention.

[0026] In the figure: 1 drainage pipe, 11 hollow pipe, 12 cone head, 2 bagged gravel bags, 21 geotextile bags, 22 gravel, 3 filter sand and stone material, 31 sand, 32 pebbles, 33 coarse gravel, 4 outlet baffle, 5 drainage hole, 6 bank wall. DETAILED DESCRIPTION

[0027] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention.

[0028] Embodiment 1:

[0029] like Figure 1-Figure 5 As shown, a filter drainage pipe device includes a drainage pipe 1, a bagged gravel bag 2, filter sand and gravel 3 and an outlet baffle 4, the drainage pipe 1 is arranged in a drainage hole 5 of a bank wall 6, the bagged gravel bag 2 is arranged on one side of the drainage pipe 1, the filter sand and gravel 3 is arranged on the other side of the drainage pipe 1 and is adjacent to the bagged gravel bag 2, and the outlet baffle 4 is arranged at the outlet end of the drainage pipe 1 and presses the filter sand and gravel 3;

[0030] The drainage pipe 1 is provided with a plurality of holes on the wall of the part located at the bagged gravel bag 2 and the outlet baffle 4. The portion where the holes are provided in the drainage pipe 1 is a water collection area for collecting the accumulated water in the soil behind the shore wall 6. The bagged gravel bag 2 provided in the water collection area can avoid blockage of the water collection area.

[0031] Specifically, the outlet baffle 4, the hollow pipe 11 and the cone head 12 are an integrated structure, and the cone head 12 and the hollow pipe 11 are welded together to reduce the resistance of the soil when the drainage pipe 1 is pressed into the soil behind the bank wall 6.

[0032] Specifically, the bagged gravel bag 2 is composed of a geotextile bag 21 and gravel 12 . The gravel 22 is arranged inside the geotextile bag 21 . The gravel 22 is small stones with a particle size of 5-10 mm.

[0033] Specifically, the geotextile bag 21 is cylindrical and fits closely to the inner wall of the drainage pipe 1 .

[0034] Specifically, the reverse filter sand and gravel 3 is sand 31, small stones 32 and coarse stones 33 matched according to a certain grade.

[0035] Specifically, the diameter of the holes on the outlet baffle 4 is smaller than the diameter of the stones in the reverse filter sand and stone material 3, which can prevent the reverse filter sand and stone material 3 in the drainage pipe 1 from being lost and can be used for drainage at the same time.

[0036] like Figure 4As shown, the drain pipe 1 consists of a hollow pipe 11 and a cone head 12, the outlet baffle 4 is arranged at the outlet end of the hollow pipe 11, and the cone head 12 is arranged at the inlet end of the hollow pipe 11. The hollow pipe 11 is a standard pipe with an outer diameter of 75mm and a total length of 1500mm. A plurality of small holes with a diameter of 5mm are opened around the pipe wall in the front section, and 20 small holes are evenly distributed on each circle. The axial spacing of the small holes along the hollow pipe 11 is 10mm, and they are arranged crosswise in a plum flower shape. This section is a water collection area with a length of 1000mm. The cone head 12 is a hollow cone, which is welded into one with the hollow pipe 11 and is arranged at the front end of the hollow pipe 11.

[0037] like Figure 2 , Figure 3 , Figure 5 As shown, the bagged gravel bag 2 includes a geotextile bag 21 and gravel 22, the geotextile bag 21 is a cylindrical bag sewn with geotextile, and the gravel 22 is small stones. The gravel 22 is poured into the geotextile bag 21 and sealed to form the bagged gravel bag 2; the bagged gravel bag 2 is inserted into the front water collection area of ​​the hollow pipe 11; the reverse filter sand and gravel 3 are sand 31, small stones 32 and coarse stones 33 with a certain gradation; the sand 31, small stones 32 and coarse stones 33 are poured into the hollow pipe 11 in turn to form a reverse filter layer; the outlet baffle 4 is a circular plate with holes, which is arranged at the outlet end of the hollow pipe 11 and is connected to the hollow pipe 11 as a whole to block the reverse filter sand and gravel 3.

[0038] The working principle of the present invention is as follows:

[0039] 1. Back filtration drainage: such as Figure 6-Figure 7 As shown, the accumulated water in the soil behind the bank wall 6 penetrates into the bagged gravel bag 2 inside through the holes on the wall of the front section of the drainage pipe 11, so that the accumulated water in the soil behind the bank wall 6 is collected. The water collection area of ​​the front section of the drainage pipe 11 is relatively long, and the range of the collected water is large and the speed is fast. After the collected water is filtered by the back-filtration sand and gravel 3, it is discharged through the holes of the outlet baffle 4, which can collect and discharge the accumulated water behind the wall without causing soil loss.

[0040] 2. The device is fixed by friction: Due to the small diameter of the pipe (75mm in diameter), the water and soil pressure on one end of the cone head 12 of the drainage pipe 1 is much smaller than the friction force on the wall of the hollow pipe 11 buried in the soil. Therefore, the drainage pipe 1 can be fixed only by friction and will not slide outward, and no other fixing measures are required.

[0041] Embodiment 2:

[0042] The downstream of a certain sluice is affected by the tide, with two rises and two falls every day. The daily high tide water level is about 4.20-4.80m, and the low tide water level is about 0.80-1.10mm. The top elevation of the bank wall is 5.50m. At an elevation of 2.20m, φ75PVC drainage pipes are installed every 3 meters. Geotextile bags filled with gravel are installed on the soil side of the drainage holes as a filter layer. The geology of this area is mainly clay-based backfill soil. After years of operation, the filter layers of some drainage holes have failed. When the groundwater level behind the bank wall is high, some drainage holes have no water seepage, and some drainage holes carry mud and sand in the water, causing local ground subsidence behind the wall. This time, the device was reinstalled at the same elevation 0.5m on the side of a drainage hole without water seepage for actual measurement. The specific steps are as follows:

[0043] 1. Drainage pipe production

[0044] (1) First, purchase a φ75 stainless steel pipe with a thickness of 3 mm, cut it into a length of 1500 mm, and stagger small holes with a diameter of 5 mm on the wall of a 1000 mm section from one end. There are 20 small holes evenly distributed around the pipe, and the hole spacing along the length of the pipe is 10 mm; then weld a 60 mm long stainless steel cone head to the end of the stainless steel pipe with holes to finally make a drainage pipe 1.

[0045] (2) 200g / m 2 The geotextile is processed into a cylindrical bag with an outer diameter of about 70 mm and a length of 1200 mm. Small stones are poured into the bag and sealed to make a bagged gravel bag 2, which is then plugged into the open hole section of the stainless steel pipe (drainage pipe 1).

[0046] (3) Then, 100 mm thick yellow sand, 100 mm thick small stones, and 100 mm thick coarse stones are poured into the stainless steel pipe (drain pipe 1) in sequence to form the reverse filter sand and stone material 3.

[0047] (4) The outlet baffle cover 4 is placed on the surface of the coarse stone of the reverse filter sand and stone material 3 and welded to the pipe mouth of the stainless steel pipe (drain pipe 1) to form a whole.

[0048] 2. Wall opening

[0049] like Figure 8 As shown, a new drainage hole 5 is opened on the shore wall 6 at a position 0.5m away from the original failed drainage hole and at an elevation of 2.20m. The hole diameter is 76mm and the drainage hole 5 is inclined upward at an angle of 2 degrees.

[0050] 3. Installation

[0051] like Fig. 9 As shown, the prepared drainage pipe 1 is inserted into the newly opened drainage hole 5 on the bank wall 6 and pushed inward. When the resistance is large, it is hammered in manually with a hammer (a wooden board is placed on the outlet baffle 4 during hammering) until the outlet baffle 4 is flush with the surface of the bank wall 6.

[0052] After 1 day, it was observed that clear water continued to seep out of the outlet of the drainage pipe 1, verifying that the anti-filtration drainage pipe device had the functions of drainage and anti-filtration.

[0053] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A reverse filtration drainage pipe device, characterized in that: The invention comprises a drainage pipe (1), a bagged gravel bag (2), a reverse filter sand and gravel material (3) and a water outlet baffle (4), wherein the drainage pipe (1) is arranged in a drainage hole (5) of a bank wall (6), the bagged gravel bag (2) is arranged on one side of the interior of the drainage pipe (1), the reverse filter sand and gravel material (3) is arranged on the other side of the interior of the drainage pipe (1) and is adjacent to the bagged gravel bag (2), and the water outlet baffle (4) is arranged at the water outlet end of the drainage pipe (1) and presses the reverse filter sand and gravel material (3); The drainage pipe (1) is provided with a plurality of holes on a portion of the pipe wall located on the bagged gravel bag (2) and on the water outlet baffle (4).

2. The reverse filtration drainage pipe device according to claim 1, characterized in that: The drainage pipe (1) is composed of a hollow pipe (11) and a cone head (12); the water outlet baffle (4) is arranged at the water outlet end of the hollow pipe (11), and the cone head (12) is arranged at the water inlet end of the hollow pipe (11).

3. The reverse filtration drainage pipe device according to claim 2, characterized in that: The water outlet baffle (4), the hollow tube (11) and the cone head (12) are an integrated structure.

4. The reverse filtration drainage pipe device according to claim 1, characterized in that: The bagged gravel bag (2) is composed of a geotextile bag (21) and gravel (22), and the gravel (22) is arranged inside the geotextile bag (21).

5. The reverse filtration drainage pipe device according to claim 4, characterized in that: The geotextile bag (21) is cylindrical and fits closely to the inner wall of the drainage pipe (1).

6. The reverse filtration drainage pipe device according to claim 1, characterized in that: The diameter of the holes on the water outlet baffle (4) is smaller than the diameter of the stones in the reverse filter sand and stone material (3).

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