An assembled filter bag and its construction method

Abstract

The application provides an assembled filter bag and a construction method thereof, and belongs to the field of filter bags of retaining walls. The filter bag comprises a base plate and a plurality of hemispherical shells with increasing volumes. The plurality of hemispherical shells are concentrically and layer by layer arranged from inside to outside. Each hemispherical shell is internally provided with a corresponding filter layer. Each hemispherical shell is provided with a plurality of mesh holes. The base plate is concentric with the hemispherical shells and seals the openings of the hemispherical shells. A through hole for connecting a preset drain pipe is arranged at the center of the base plate. Compared with the prior art, the semi-finished product components and materials of the application can be transported from the factory to the construction site and directly arranged and installed, the construction is relatively simple and convenient, the construction time can be shortened, the manpower and material resources can be saved, and the construction quality can be effectively controlled.

Description

Technical Field

[0001] This invention belongs to the field of retaining wall filter bags, specifically relating to a prefabricated filter bag and its construction method. Background Technology

[0002] Retaining walls are widely used in water conservancy, municipal, transportation, and port construction projects to support naturally formed or artificially excavated slopes. To reduce the hydrostatic pressure caused by water accumulation in the retaining wall, appropriate drainage measures should be installed according to the design.

[0003] In existing technologies, drainage pipes are typically installed within the retaining wall for drainage. To reduce the possibility of piping, graded crushed stone filter bags or graded crushed stone filter layers are installed at the drainage holes of the drainage pipes. During actual construction, workers usually fabricate the filter bags on-site. The fabrication or usage methods are as follows:

[0004] Method 1: First, wrap the drainage hole with geotextile, then wrap the geotextile with a layer of graded sand, and finally wrap the graded sand layer with a layer of graded crushed stone to obtain a reverse filter bag.

[0005] Method 2: Wrap graded sand and gravel directly with geotextile to obtain filter bags, and stack the filter bags near the drainage pipe.

[0006] The above two methods have many drawbacks:

[0007] Disadvantage 1: Different construction workers have different quality standards, making it difficult to control the quality of the filter bags and the construction quality.

[0008] Disadvantage 2: The graded crushed stone in the filter bag is not convenient for on-site construction.

[0009] Disadvantage 3: When there is significant external water seepage, the graded crushed stone will be dispersed by the water flow, causing the soil to block the drainage holes, resulting in the retaining wall being unable to drain effectively.

[0010] In summary, the traditional manufacturing and construction methods for filter bags have many drawbacks, affecting the drainage performance of retaining walls and easily causing safety hazards. Summary of the Invention

[0011] This invention provides an assembled reverse filter bag and its construction method to solve the problems existing in the prior art.

[0012] Firstly, the objective of this invention is achieved through the following technical solution:

[0013] This invention provides an assembled reverse filter bag, including a chassis and multiple hemispherical shells of increasing volume. The multiple hemispherical shells are concentrically stacked from the inside out. Each hemispherical shell has a corresponding filter material layer inside, and each hemispherical shell has multiple mesh openings. The chassis is concentric with the hemispherical shells and seals the openings of the hemispherical shells. The center of the chassis has a through hole for connecting a preset drain pipe.

[0014] Preferably, the system also includes multiple fasteners, and the chassis is connected to the hemispherical shell through the fasteners. The through hole at the center of the chassis is an internally threaded hole.

[0015] Preferably, the fastener is a polycarbonate fastener; the fastener includes a fixing part and a flexible strip part, one end of the flexible strip part is fixedly connected to the side wall of the fixing part, and the other end is provided with a serrated part, and the fixing part has a toothed slot for biting the serrated part.

[0016] Preferably, the chassis is a polycarbonate chassis.

[0017] Preferably, the hemispherical shell is provided with three layers, and the filter media layer includes, but is not limited to, a fine sand filter media layer, a coarse sand filter media layer and a gravel filter media layer. The fine sand filter media layer is provided inside the inner hemispherical shell, the coarse sand filter media layer is provided between the middle hemispherical shell and the inner hemispherical shell, and the gravel filter media layer is provided between the outer hemispherical shell and the middle hemispherical shell.

[0018] Preferably, the inner wall of the hemispherical shell is covered with geotextile.

[0019] Preferably, it also includes a water-stop rubber ring, which is disposed at the connection between the chassis and the preset drain pipe.

[0020] Preferably, the mesh size is 8×10mm.

[0021] Preferably, the thickness of each hemispherical shell ranges from 100mm to 200mm.

[0022] Secondly, the objective of this invention is achieved through the following technical solution:

[0023] A construction method for a prefabricated filter bag, used to assemble the aforementioned prefabricated filter bag, the method comprising:

[0024] Multiple hemispherical shells of predetermined thickness are made using fine lead wire mesh or stainless steel wire mesh with a wire diameter range of 1.0mm-2.7mm;

[0025] Multiple hemispherical shells of increasing volume are stacked from the inside out, and geotextile is placed between two layers of hemispherical shells;

[0026] Fasteners are used to pre-fix each layer of hemispherical shell and chassis, and filling openings are left for each layer of hemispherical shell;

[0027] Fill each hemispherical shell with the corresponding filter media;

[0028] After all the hemispherical shell layers are filled, fasteners are used to secure each hemispherical shell layer to the chassis.

[0029] Compared with the prior art, the present invention has at least the following advantages:

[0030] 1. The filter bags in this invention can be pre-processed and manufactured in the factory to achieve standardization, thereby ensuring the quality, safety and reliability of the filter bags.

[0031] 2. For some special cases where on-site assembly of the filter pack is required, the semi-finished components and materials of this invention can be transported from the factory to the construction site and directly installed. The construction is relatively simple and convenient, which can shorten the construction time, save manpower and material resources, and effectively control the construction quality.

[0032] 3. The filter bag of the present invention can perform multi-layer reverse filtration of seepage water according to the soil quality and water conditions behind the wall. The seepage water behind the wall is filtered through geotextile, hemispherical shell and each filter material layer, and then collected into PVC drainage pipe and discharged outside the wall through the drainage pipe, thereby giving full play to the "soil filtration and drainage" function of the filter bag, and thus improving the stability of the retaining wall. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram showing the connection between the assembled filter bag and the retaining wall in Embodiment 1 of the present invention;

[0035] Figure 2 This is a schematic diagram showing the connection between the hemispherical shell and the chassis in Embodiment 1 of the present invention;

[0036] Figure 3 This is a schematic diagram of the fastener structure in Embodiment 1 of the present invention;

[0037] Figure 4 This is a flowchart of the construction method of the assembled reverse filter bag in Embodiment 2 of the present invention.

[0038] Figure label:

[0039] 1. Drainage pipe; 2. Retaining wall; 3. Fastener; 31. Fixing part; 32. Flexible strip part; 321. Serrated part; 4. Water-stop rubber ring; 5. Chassis; 6. Geotextile; 7. Hemispherical shell; 8. Fine sand filter layer; 9. Coarse sand filter layer; 10. Crushed stone filter layer. Detailed Implementation

[0040] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be assembled and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0042] This invention provides an assembled reverse filter bag and its construction method to solve the problems existing in the prior art.

[0043] Example 1

[0044] like Figure 1 As shown, an assembled reverse filter bag includes a chassis 5 and multiple hemispherical shells 7 of increasing volume. The multiple hemispherical shells 7 are concentrically stacked from the inside out, and each hemispherical shell 7 contains a corresponding filter material layer. Each hemispherical shell 7 has multiple mesh openings. The chassis 5 is concentric with the hemispherical shells 7 and seals the openings of the hemispherical shells 7. A through hole for connecting a pre-set drainage pipe 1 is opened in the center of the chassis 5. One end of the drainage pipe 1 extends into the interior of the retaining wall 2, while the other end extends into and is detachably connected to the chassis 5.

[0045] Compared with existing technologies, the filter bags of this invention can be prefabricated in the factory, and it is more convenient for construction personnel to assemble the filter bags on site. This can significantly shorten the construction time, save manpower and material resources, and effectively control the construction quality.

[0046] Among them, such as Figure 1As shown, three hemispherical shells 7 are provided. Each hemispherical shell 7 is made of fine lead wire mesh or stainless steel wire mesh with a wire diameter ranging from 1.0mm to 2.7mm. The thickness of each hemispherical shell 7 ranges from 100mm to 200mm, and multiple 8×10mm mesh openings are reserved after manufacturing, allowing water to be filtered through these openings. The inner hemispherical shell is filled with fine sand filter media, forming a fine sand filter media layer 8. Coarse sand filter media is filled between the inner and middle hemispherical shells, forming a coarse sand filter media layer 9. Crushed stone filter media is filled between the outer and middle hemispherical shells, forming a crushed stone filter media layer 10.

[0047] It should be noted that the filter media used to fill the interior of the hemispherical shell 7 includes, but is not limited to, fine sand filter media, coarse sand filter media layer 9 and gravel filter media. In other embodiments, these filter media can be adjusted according to actual conditions.

[0048] Preferably, during assembly, a water-permeable geotextile 6 is placed on the inner wall of the hemispherical shell 7 to enhance the filtration effect of the filter bag of the present invention.

[0049] like Figure 2 As shown, the filter bag of the present invention also includes multiple fasteners 3. In this embodiment, the chassis 5 is a ring-shaped disc made of polycarbonate material, the outer diameter of which is slightly larger than the inner diameter of the outer hemispherical shell 7. The chassis 5 is fixedly connected to the multi-layer hemispherical shell 7 by multiple fasteners 3.

[0050] Preferably, the center of the chassis 5 is provided with an internal threaded hole, and the end of the drain pipe 1 extending out of the retaining wall 2 is provided with an external thread. The drain pipe 1 is threadedly connected to the chassis 5 to facilitate the rapid assembly of the filter bag of the present invention.

[0051] Reference Figure 1 and Figure 2 In this embodiment, the drainage pipe 1 is made of PVC pipe. The filter bag of the present invention also includes a water-stop rubber ring 4, which is set near the internal threaded hole of the base 5 to reduce the possibility of water seepage at the connection between the drainage pipe 1 and the filter bag of the present invention. Before connecting the drainage pipe 1 to the filter bag, the construction personnel need to make a beveled cut at the end of the drainage pipe 1 that extends out of the retaining wall 2 to process a beveled opening, and wrap the beveled opening with a water-permeable geotextile 6 to enhance the filtering and drainage effect of the filter bag of the present invention.

[0052] like Figure 2 and Figure 3As shown, in this embodiment, the fastener 3 is made of polycarbonate material. In other embodiments, the fastener 3 can also be made of materials such as aluminum alloy, stainless steel, or leather. The fastener 3 consists of a fixing part 31 and a flexible strip part 32. The envelope of the fixing part 31 is cubic, and the fixing part 31 has a toothed slot. The flexible strip part 32 is elongated, with one end fixedly connected to the side wall of the fixing part 31, and the other end having a serrated part 321. When the construction personnel need to fix the chassis 5 and the hemispherical shell 7, they can first drill holes in the chassis 5, then insert the flexible strip part 32 of the fastener 3 into the drilled position and bind it to the hemispherical shell 7, and then insert the flexible strip part 32 into the toothed slot to tighten it.

[0053] The construction process for installing the prefabricated filter bag in retaining wall 2 in this embodiment is as follows:

[0054] 1. Drainage pipes 1 are arranged at certain intervals on the wall body of retaining wall 2.

[0055] 2. Prefabricate the hemispherical shell 7 and chassis 5 of the reverse filter bag of the present invention.

[0056] 3. Assemble the hemispherical shell 7 and chassis 5 and fill them with the corresponding filter media to form a reverse filter bag.

[0057] 4. Connect and fix the chassis 5 to the drain pipe 1, and seal and waterproof the joint between the drain pipe 1 and the chassis 5.

[0058] Example 2

[0059] like Figure 4 As shown, this embodiment provides a construction method for a prefabricated filter bag, used to assemble the prefabricated filter bag in Embodiment 1. The method of the present invention includes:

[0060] S1: Multiple hemispherical shells of predetermined thickness are made using fine lead wire mesh or stainless steel wire mesh with a wire diameter range of 1.0mm-2.7mm.

[0061] In this embodiment, construction workers can put 1.0mm-2.7mm fine lead wire mesh or stainless steel wire mesh into a prefabricated mold in the factory and press it to form a hemispherical shell of the corresponding size.

[0062] S2: Stack multiple hemispherical shells of increasing volume from the inside out, and place geotextile between two layers of hemispherical shells.

[0063] In this embodiment, the geotextile needs to completely cover the outer wall of the inner hemispherical shell.

[0064] S3: Use fasteners to pre-fix each layer of hemispherical shell and chassis, and leave filling ports for each layer of hemispherical shell.

[0065] Specifically, by pre-fixing each layer of hemispherical shell and chassis, filter media can be filled into the interlayer of multiple hemispherical shells.

[0066] S4: Fill each layer of the hemispherical shell with the corresponding filter media.

[0067] In this embodiment, the filter media is filled from the inner layer to the outer layer.

[0068] S5: After all the hemispherical shell layers are filled, fasteners are used to secure each hemispherical shell layer and the chassis.

[0069] Using the methods described above, factories can quickly produce filter bags in large quantities. These filter bags are standardized and of guaranteed quality, which helps to shorten the time required for on-site construction and improve the quality of construction.

[0070] After the filter bag is assembled, the construction workers also need to connect the drain pipe to the filter bag. The specific method is as follows:

[0071] Step 1: Select PVC pipes with a diameter range of 50mm-150mm as drainage pipes.

[0072] It should be noted that the diameter of the drainage pipe determines its drainage capacity, and the optimal pipe diameter needs to be set according to the actual situation of the retaining wall.

[0073] Specifically, using PVC pipes with a diameter range of 50mm-150mm as drainage pipes can improve the drainage effect of the retaining wall.

[0074] Step 2: Insert the drain pipe into the pre-set retaining wall.

[0075] In this embodiment, the decision to drill holes in the retaining wall is based on the hardness of the retaining wall, so as to facilitate the insertion of the drainage pipe deep into the retaining wall.

[0076] Step 3: Set the slope of the drainage pipe according to the permeability of the retaining wall.

[0077] In this embodiment, the water permeability of the retaining wall is generally divided into three categories: permeable, slightly permeable, and impermeable.

[0078] Specifically, the more permeable the retaining wall, the smaller the slope of the drainage pipe.

[0079] The specific method for step 3 above is as follows:

[0080] If the permeability coefficient of the retaining wall is less than 1.0 cm / s, the slope of the drainage pipe should be 10%.

[0081] If the permeability coefficient of the retaining wall is between 4.0cm and 10cm / s, the slope for installing the drainage pipe should be 5%.

[0082] If the permeability coefficient of the retaining wall is greater than 10 cm / s, the slope of the drainage pipe should be 2%.

[0083] By using the above method, the slope is set according to the permeability of the retaining wall to enhance the drainage effect of the retaining wall.

[0084] Step 4: Cut the end of the drainage pipe that is exposed on the retaining wall to obtain a bevel.

[0085] Step 5: Wrap the beveled opening with geotextile and thread the drainage pipe to the base plate.

[0086] Compared with existing technologies, this invention simplifies the construction process, shortens construction time, saves manpower and material resources, and effectively controls construction quality by prefabricating filter bags and simply processing drainage pipes to directly install the filter structure of the retaining wall.

[0087] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this invention.

Claims

1. A modular reverse filter bag, characterized in that, It includes a chassis (5) and three hemispherical shells (7) with increasing volume. The three hemispherical shells (7) are concentric and stacked from the inside to the outside. Each hemispherical shell (7) has a corresponding filter material layer inside. Each hemispherical shell (7) has multiple mesh openings. The chassis (5) is concentric with the hemispherical shells (7) and seals the openings of the hemispherical shells (7). The center of the chassis (5) has a through hole for connecting a preset drain pipe (1). It also includes multiple fasteners (3), the chassis (5) is connected to the hemispherical shell (7) through the fasteners (3), and the through hole in the center of the chassis (5) is an internal thread hole; The fastener (3) is a polycarbonate fastener (3); the fastener (3) includes a fixing part (31) and a flexible strip part (32). One end of the flexible strip part (32) is fixedly connected to the side wall of the fixing part (31), and the other end is provided with a serrated part (321). The fixing part (31) is provided with a toothed slot for biting the serrated part (321). The filter media layer includes, but is not limited to, a fine sand filter media layer (8), a coarse sand filter media layer (9), and a gravel filter media layer (10). The fine sand filter media layer (8) is disposed inside the inner hemispherical shell, the coarse sand filter media layer (9) is disposed between the middle hemispherical shell and the inner hemispherical shell, and the gravel filter media layer (10) is disposed between the outer hemispherical shell and the middle hemispherical shell. The inner wall of the hemispherical shell (7) is covered with geotextile (6); It also includes a water-stop rubber ring (4), which is disposed at the connection between the chassis (5) and the preset drain pipe (1); The thickness of each hemispherical shell (7) ranges from 100mm to 200mm.

2. The assembled reverse filter bag according to claim 1, characterized in that, The chassis (5) is a polycarbonate chassis (5).

3. The assembled reverse filter bag according to claim 1, characterized in that, The mesh size is 8×10mm.

4. A construction method for a prefabricated reverse filter bag, characterized in that, The method for assembling the assembled reverse filter bag according to any one of claims 1-3 includes: Three hemispherical shells of predetermined thickness were made using fine lead wire mesh or stainless steel wire mesh with a wire diameter range of 1.0 mm to 2.7 mm (7); Three hemispherical shells (7) with increasing volume are stacked from the inside out, and geotextile (6) is placed between two hemispherical shells (7); Fasteners (3) are used to pre-fix each layer of hemispherical shell (7) and chassis (5), and filling openings are left for each layer of hemispherical shell (7); Fill each layer of the hemispherical shell (7) with the corresponding filter material; After each layer of hemispherical shell (7) is filled, fasteners (3) are used to fasten each layer of hemispherical shell (7) and the chassis (5).

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