Filter plate, backwash filter plate structure and backwash filter plate structure construction method

Abstract

The application provides a filter plate, a backwashing filter plate structure and a backwashing filter plate structure construction method, and relates to filter tank construction; wherein the filter plate comprises a main body in the form of a plate which is prefabricated from concrete, the main body comprises a first surface, a second surface and four side surfaces, the first surface and the second surface are arranged in parallel, the four side surfaces are connected end to end, and each side surface comprises a first joint surface and a second joint surface which are adjacent to each other, the first joint surface and the second joint surface are arranged at an angle, the angle is arranged away from the main body, the first joint surface is adjacent to the first surface, the second joint surface is adjacent to the second surface, the main body is provided with a through hole, and the through hole is arranged through the first surface and the second surface. The application optimizes the filter plate structure and the filter plate construction method, solves the construction problem of the backwashing filter plate structure of the ultra-low-clearance filter tank, and improves safety and efficiency.

Description

Technical Field

[0001] This application relates to the field of filter bed construction, and more specifically, to a filter plate, a backwash filter plate structure, and a construction method for the backwash filter plate structure. Background Technology

[0002] The construction process of cast-in-place concrete filter plates requires a series of procedures, including the erection of the formwork support system, the binding of reinforcing bars, the pouring of concrete, and curing.

[0003] When the net height of the filter bed is less than 0.9m, not only is it difficult for conventional construction machinery to enter the site, but the space for manual operation is also severely limited. The formwork support system is difficult to erect properly due to insufficient net height, easily leading to safety hazards such as support instability. At the same time, the formwork materials after demolding need to be manually cut into sections before being transported out, significantly increasing construction difficulty and time costs. These construction difficulties mean that when the cast-in-place filter plate scheme is implemented in ultra-low net height filter beds, it is difficult to guarantee construction safety and seriously hinders the overall project progress. Summary of the Invention

[0004] The purpose of this application is to provide a filter plate, a backwash filter plate structure, and a construction method for the backwash filter plate structure, which can solve the problem of ultra-low headroom construction, significantly shorten the construction period, and improve construction efficiency and safety.

[0005] In a first aspect, the present invention provides a filter plate, the filter plate comprising a plate-shaped main body precast from concrete, the main body comprising a first surface, a second surface and four side surfaces, the first surface and the second surface being arranged parallel to each other, the four side surfaces being connected end to end, and each side surface comprising a first joint surface and a second joint surface adjacent to each other, the first joint surface and the second joint surface being arranged at an angle, the angle being away from the main body, the first joint surface being adjacent to the first surface, the second joint surface being adjacent to the second surface, and the main body having a through hole, the through hole being disposed through the first surface and the second surface.

[0006] In an optional embodiment, the main body is provided with a reference surface, which is located at the midpoint of the distance between the first surface and the second surface, and the first seam surface and the second seam surface are symmetrically distributed with respect to the reference surface.

[0007] In an optional embodiment, the through hole is provided with internal threads.

[0008] Secondly, the present invention provides a backwashing filter plate structure, which includes a frame, a fastening assembly, and the filter plate described in the foregoing embodiments. The frame is pre-embedded with anchor bolts, and a plurality of filter plates are arrayed and overlapped on the frame. At least one anchor bolt is provided between two adjacent filter plates. The height of the exposed end of the anchor bolt is higher than the installation height of the filter plate. The fastening assembly cooperates with the anchor bolt to fix the filter plate.

[0009] In an optional embodiment, one side of the filter plate and the side of the adjacent filter plate together define a joint, the joint being filled with a fine aggregate concrete layer, the upper surface of the fine aggregate concrete layer being flush with the first surface of the filter plate, the lower surface of the fine aggregate concrete layer being flush with the second surface of the filter plate, and the cross-section of the fine aggregate concrete layer gradually narrowing from the middle to both ends.

[0010] In an optional embodiment, the fastening assembly includes a fastening plate, a washer, and a nut. The fastening plate is sleeved on the anchor bolt and covers at least two of the filter plates. The washer is located on the side of the fastening plate away from the filter plates, and the nut is located on the side of the washer away from the fastening plate. The nut is screwed to the anchor bolt.

[0011] In an optional embodiment, the backwash filter plate structure further includes a fixing assembly, which includes a fixing plate, a washer, and an expansion bolt. The fixing plate includes a first fixing part and a second fixing part, the first fixing part being perpendicularly adjacent to the second fixing part, the first fixing part pressing against the filter plate, the washer being sleeved on the expansion bolt, and the expansion bolt passing through the second fixing part.

[0012] Thirdly, the present invention provides a method for constructing a backwashing filter plate structure, used for constructing the backwashing filter plate structure described in the foregoing embodiments, the method comprising: The installation scheme of the backwash filter plate structure was designed through 3D modeling, and the filter plate module, the frame casting location, and the anchor bolt pre-embedding location were determined. The frame is cast in place inside the filter tank, and anchor bolts are pre-embedded at the pre-embedded locations according to the design plan; Prefabricated filter plates of a predetermined module are installed outside the filter tank. The filter plates are hoisted onto the frame and multiple filter plates are spliced ​​together to form a joint. A gap is formed between the filter plates and the inner wall of the filter tank. Fill the joints and gaps with fine aggregate concrete, which hardens to form a fine aggregate concrete layer. The filter plate is fixed to the frame by fastening components, and the filter plate is fixed to the filter tank by fixing components.

[0013] In an optional implementation, the joints and gaps are cleaned with an air gun before filling with fine aggregate concrete. After the fine aggregate concrete is injected, it is compacted with a vibrator. The surface is then smoothed and covered with a curing film for moisture retention and curing.

[0014] In an optional implementation, the pre-embedded interval between adjacent anchor bolts is a fixed spacing, forming standardized anchoring points.

[0015] Compared to existing technologies, the beneficial effects of this application are: This application solves the construction difficulties of backwashing filter plate structure in ultra-low headroom filters by casting a frame inside the filter tank and prefabricating filter plates outside the filter tank, and then hoisting the filter plates onto the frame for splicing. This improves the construction safety factor, eliminates the need to remove formwork materials, and speeds up the project progress. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A three-dimensional structural schematic diagram of the filter plate in some embodiments is shown; Figure 2 A plan view of the filter plate is shown in some embodiments; Figure 3 A three-dimensional schematic diagram of the backwash filter plate structure in some embodiments is shown; Figure 4 A plan view of the frame is shown in some embodiments; Figure 5 Schematic diagrams of the fine aggregate concrete layer at the joints are shown in some embodiments; Figure 6 Schematic diagrams of the fine aggregate concrete layers in the gaps are shown in some embodiments; Figure 7 The following are schematic diagrams illustrating the installation of the fastening components and the filter plate in some embodiments; Figure 8 The following are schematic diagrams illustrating the installation of the fixing components and filter plates in some embodiments; Figure 9 A three-dimensional structural schematic diagram of the filter bed is shown in some embodiments.

[0018] Explanation of key component symbols: 100-Filter plate; 110-First surface; 120-Side surface; 121-First side; 122-Second side; 123-Third side; 124-Fourth side; 125-Fifth side; 126-Sixth side; 127-Seventh side; 120a-First joint surface; 120b-Second joint surface; 140-Through hole; 200-Frame; 210-Filter column; 220-Filter beam; 221-Anchor bolt; 300-Fastening assembly; 310-Fastening plate; 320-Gasket; 330-Nut; 400-Fine aggregate concrete layer; 500-Fixing assembly; 510-Fixing plate; 520-Washer; 530-Expansion bolt; 10-Drainage channel; 11-Backwash water distribution hole; 20-V-shaped guide channel. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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 application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] Example 1 Please see Figure 1 This embodiment provides a filter plate 100, which is suitable for use in wastewater treatment filters. In the field of high-precision industrial wastewater treatment, such as semiconductor chip manufacturing, the filter is the core unit of secondary or tertiary treatment in water plants, and its operational efficiency directly affects the effluent quality. As a core functional component of the water treatment filter, the filter plate 100 plays a crucial role in both filtration and backwashing processes. Its structural stability and installation accuracy directly affect the treatment effect and service life of the filter.

[0025] The filter plate 100 includes a plate-shaped main body made of precast concrete. In this embodiment, the main body is a flat plate structure. The main body includes a first surface 110, a second surface (not shown in the figure), and four side surfaces 120. The first surface 110 and the second surface are arranged parallel to each other. The four side surfaces 120 are connected end to end. Each side surface 120 includes a first joint surface 120a and a second joint surface 120b that are adjacent to each other. The first joint surface 120a and the second joint surface 120b are arranged at an angle away from the main body. The first joint surface 120a is adjacent to the first surface 110, and the second joint surface 120b is adjacent to the second surface.

[0026] Please refer to the following: Figure 1 and Figure 2In this embodiment, the first surface 110 and the second surface are horizontal flat surfaces. The side surface 120 includes a first side 121, a second side 122, a third side 123, a fourth side 124, a fifth side 125, a sixth side 126 and a seventh side 127. The first side 121, the second side 122, the third side 123 and the seventh side 127 enclose to form a first seam surface 120a, and the fourth side 124, the fifth side 125, the sixth side 126 and the seventh side 127 enclose to form a second seam surface 120b.

[0027] Specifically, the first seam surface 120a and the second seam surface 120b are symmetrically arranged with the seventh side 127 as the axis of symmetry. The first seam surface 120a is rectangular and the second seam surface 120b is also rectangular. The second side 122 of the first seam surface 120a is located on the first surface 110, and the fifth side 125 of the second seam surface 120b is located on the second surface.

[0028] In this embodiment, the first surface 110 can be set as the upper surface of the main body and the second surface as the lower surface of the main body. Therefore, the first seam surface 120a extends to the upper surface of the main body and the second seam surface 120b extends to the lower surface of the main body. This design makes the side surface 120 have a V-shaped groove structure.

[0029] The main body is provided with a through hole 140, which is disposed through the first surface 110 and the second surface. Wastewater is filtered in the through hole 140 along a first direction. When filtration stops, the water flow is backwashed in the through hole 140 along a second direction opposite to the first direction, thereby flushing out the impurities retained in the through hole 140.

[0030] In practical applications, the main body is externally connected to a backwash pipe. In this embodiment, the through hole 140 is provided with an internal thread, and the main body is threadedly connected to the external thread of the backwash pipe through the internal thread. Each through hole 140 connects to the outlet of a backwash pipe. It can be understood that the through hole 140 has two functions: one is filtration, and the other is backwashing. Before filtration, the backwash pipe needs to be removed, and during backwashing, filtration needs to be stopped.

[0031] If the filter plate 100 with internal threads is cast in place in a narrow filter tank, a mold with external threads is required, which is more difficult to implement. In this embodiment, the filter plate 100 is prefabricated outside the filter tank, which provides more operating space and reduces construction difficulty.

[0032] In some embodiments, the main body is provided with a reference surface, which is located at the midpoint of the distance between the first surface 110 and the second surface. The first seam surface 120a and the second seam surface 120b are symmetrically distributed with respect to the reference surface. Specifically, the seventh side 127 is located on the reference surface.

[0033] This embodiment reduces the difficulty of constructing ultra-low headroom filters by using prefabricated filter plates 100. The filter plates 100 provided in this embodiment have a backwashing function. In the event of poor filtration, the through holes 140 can be backwashed to remove impurities, improve filtration efficiency, and extend service life.

[0034] Example 2 Please see Figure 3 and Figure 4 Based on Embodiment 1, this embodiment provides a backwashing filter plate structure to solve the installation problem of filter plate 100.

[0035] The backwash filter plate structure includes a frame 200, a fastening assembly 300, and the filter plate 100 of Embodiment 1.

[0036] The frame 200 is pre-embedded with anchor bolts 221, which are made of M14 stainless steel and have an exposed length of ≥150mm.

[0037] Multiple filter plates 100 are arrayed and overlapped on the frame 200. At least one anchor bolt 221 is provided between two adjacent filter plates 100. The height of the exposed end of the anchor bolt 221 is higher than the installation height of the filter plate 100. The fastening assembly 300 cooperates with the anchor bolt 221 to fix the filter plate 100.

[0038] In this embodiment, the frame 200 includes filter columns 210 and filter beams 220. The filter columns 210 are located at the bottom of the filter tank, and the filter beams 220 overlap the filter columns 210. For example, multiple filter columns 210 are arranged in a row, and a row of filter columns 210 jointly supports a filter beam 220. This embodiment includes multiple rows of filter columns 210, and then multiple anchor bolts 221 are pre-embedded on each filter beam 220.

[0039] For ease of description and understanding, the short side of the filter plate 100 is taken as the width and the long side as the length. From the width direction of the filter plate 100, the long sides of adjacent filter plates 100 are joined together at the seam, and multiple filter plates 100 are spliced ​​together in a row along the width direction of the filter plate 100. From the length direction of the filter plate 100, the short sides of adjacent filter plates 100 are joined together at the seam, and multiple filter plates 100 are spliced ​​together in a column along the length direction of the filter plate 100.

[0040] Please see Figure 1 and Figure 5Since the side surface 120 of the main body of the filter plate 100 has a V-shaped groove structure, the first joint surface 120a and the second joint surface 120b are symmetrically distributed with the reference plane as the symmetrical surface. The side surface 120 of one filter plate 100 and the side surface 120 of the adjacent filter plate 100 together define the joint. The joint is filled with a fine stone concrete layer 400. The upper surface of the fine stone concrete layer 400 is flush with the first surface 110 of the filter plate 100, and the lower surface of the fine stone concrete layer 400 is flush with the second surface of the filter plate 100. The cross-section of the fine stone concrete layer 400 is gradually reduced from the middle to both ends.

[0041] Please see Figure 3 and Figure 6 Similarly, the filter plate 100 located at the edge of the backwash filter plate structure and the tank wall of the filter pool also define a joint, and the joint is filled with a fine stone concrete layer 400. At this time, the cross-sectional area of ​​the fine stone concrete layer 400 is half of the cross-sectional area of ​​the fine stone concrete layer 400 between adjacent filter plates 100.

[0042] Please see Figure 1 , Figure 5 and Figure 6 Because the fine aggregate concrete layer 400 is shaped with a larger middle and smaller ends, the middle part always provides a reaction force when the lower or upper end of the fine aggregate concrete layer 400 is subjected to pressure, which prevents the fine aggregate concrete layer 400 from being blown open by the pressure and improves the reliability of the backwash filter plate structure.

[0043] Compared to setting the main side 120 as a planar structure, this embodiment can increase the filling volume of the fine stone concrete layer 400. When backwashing is turned on, the large volume of the fine stone concrete layer 400 can resist the force of backwashing, preventing the fine stone concrete layer 400 from being sprayed upward under pressure, thus improving the installation stability of the backwash filter plate structure, extending its service life, and reducing the number of maintenance times.

[0044] In addition, the fine stone concrete layer 400 of this application has a wedge-shaped structure with a wedge-shaped cross-section, which plays a role in fixing the backwash filter plate structure and further improves the installation stability of the filter plate 100.

[0045] Please see Figure 4 and Figure 7 The fastening assembly 300 includes a fastening plate 310, a washer 320, and a nut 330. The fastening plate 310 is sleeved on the anchor bolt 221 and covers at least two filter plates 100. The washer 320 is located on the side of the fastening plate 310 away from the filter plate 100. The nut 330 is located on the side of the washer 320 away from the fastening plate 310 and is screwed to the anchor bolt 221.

[0046] It is understandable that when the fine aggregate concrete layer 400 is poured, the fine aggregate concrete layer 400 covers part of the anchor bolts 221, and the exposed end of the anchor bolts 221 is still exposed in the fine aggregate concrete layer 400, and the nut 330 is threadedly connected to the exposed end.

[0047] Please see Figure 8 The backwash filter plate structure also includes a fixing component 500, which includes a fixing plate 510, a washer 520 and an expansion bolt 530. The fixing plate 510 includes a first fixing part and a second fixing part, which are perpendicularly adjacent to each other. The first fixing part presses against the filter plate 100. The washer 520 is sleeved on the expansion bolt 530, and the expansion bolt 530 passes through the second fixing part.

[0048] When the fixing plate 510 is arranged on one side, it presses against the edge of a single filter plate 100. When arranged on both sides, it simultaneously presses against the common edge of two adjacent filter plates 100. The gap between the first fixing part and the top surface of the filter plate 100 is ≤1mm. A pre-tightening force is applied by a torque wrench to achieve the horizontal limit of the edge filter plate 100.

[0049] The expansion bolts 530 here pass through the second fixing part and are fixed to the pool wall, further improving the fixing stability of the filter plate 100. Specifically, holes are drilled in the pool wall, and Φ12 stainless steel expansion bolts 530 are used to fix the second fixing part at the same interval.

[0050] Please see Figure 7 and Figure 8 The fastening plate 310 is configured as a square stainless steel pressure plate, and the fixing plate 510 is configured as an L-shaped stainless steel pressure plate. The fastening plate 310 and the fixing plate 510 are made of stainless steel, which has high bending resistance and ensures the stable installation of the filter plate 100.

[0051] In this embodiment, the filter plate 100 is a precast concrete body. On one hand, it is produced in a standardized factory using CNC machining, ensuring that the flatness error of the filter plate 100 is ≤±1mm (±5mm or more for cast-in-place processes), and the water / air pore position accuracy reaches ±0.5mm, avoiding problems such as "short-circuiting" of backwash water flow and uneven distribution of the filter media layer. On-site construction employs a formwork-free assembly process, shortening the construction cycle from the traditional 10-15 days of cast-in-place construction to 2-3 days, increasing efficiency by over 80%, and is particularly suitable for the ultra-low headroom environment of 0.9m in filter tanks in fully underground wastewater treatment plants.

[0052] On the other hand, due to the high strength of concrete, the installation of filter plate 100 is relatively difficult. In this embodiment, fastening component 300 and fixing component 500 are used to achieve a tight connection between filter plate 100 and frame 200, ensuring that filter plate 100 maintains a stable installation state under the strong force of backwashing. This embodiment has a strong impact-resistant anchoring system that can withstand high-frequency impacts of 12 m³ / m²·h of gas impact and 70 m³ / m²·h of water flow impact, reducing joint displacement and reducing filter media loss.

[0053] The backwash filter plate structure adopts a standardized module, which supports horizontal and vertical splicing. It can be quickly adapted to filter tanks with different functions and sizes, avoiding the inconvenience caused by customized construction of cast-in-place process, and significantly improving the adaptability of filter tank process and the convenience of later operation and maintenance.

[0054] In addition, both the fastening component 300 and the fixing component 500 are universal accessories, with low manufacturing costs, simple operation, and convenient construction.

[0055] Example 3 Please see Figure 4 and Figure 9 Based on the above embodiments, this embodiment provides a construction method for a backwashing filter plate structure. This construction method is used to construct the backwashing filter plate structure described in the above embodiments. The backwashing filter plate structure construction method includes: S100. Design the installation scheme of the backwash filter plate structure through three-dimensional modeling and determine the module of filter plate 100, the cast-in-place position of frame 200 and the pre-embedded position of anchor bolt 221.

[0056] This embodiment designs the installation position and space of the backwash filter plate structure according to the shape and size of the filter tank.

[0057] The filter plate 100 module is allocated according to the installation location and the size of the installation space. In actual use, the size of the filter plate 100 can be uniform or divided into different specifications, and then selected according to the needs.

[0058] The position of the frame 200 is determined according to the modular configuration of the filter plate 100. A filter beam 220 is cast in place at the adjacent position of the two adjacent rows of filter plates 100, and multiple filter columns 210 are cast in place under the filter beam 220.

[0059] Please see Figure 3 and Figure 4Based on the modular configuration of the filter plate 100 and the cast-in-place location of the frame 200, the pre-embedded positions of the anchor bolts 221 are determined. The anchor bolts 221 are pre-embedded on the filter beam 220, and the anchor bolts 221 are pre-embedded to the adjacent positions of the adjacent filter plates 100. According to the finite element analysis, the designers added anchor bolts 221 to the positions with high stress to ensure that the filter plate 100 will not be forced upward and break off under the strong force of backwashing in this embodiment.

[0060] Please continue reading. Figure 9 In this embodiment, two backwash filter plate structures are set in the filter tank. The two backwash filter plate structures are symmetrically distributed on both sides of the drainage channel 10. The top of the drainage channel 10 is higher than the backwash filter plate structure. The bottom of the drainage channel 10 is provided with multiple backwash water distribution holes 11. The backwash water distribution holes 11 are used for drainage. The backwash pipes pass through the gaps between the filter columns 210 and are connected to the lower end of the wall of the through hole 140. The water in the air-water combined flushing and water rinsing processes described later is discharged through the backwash water distribution holes 11.

[0061] In this embodiment, two V-shaped guide channels 20 are also provided on the side wall of the filter tank, with the two V-shaped guide channels 20 facing the top of the filter tank.

[0062] Please see Figure 4 .

[0063] S200. Cast a frame 200 in place inside the filter tank, and pre-embed anchor bolts 221 at the pre-embedded locations according to the design scheme.

[0064] The frame 200 is cast in place at the bottom of the filter tank.

[0065] In some embodiments, the filter column 210 and the filter beam 220 are cast simultaneously. A template is built at the bottom of the filter tank, and then the filter column 210 and the filter beam 220 are cast in place inside the template. After the filter column 210 and the filter beam 220 reach the preset strength, the template is removed.

[0066] In some embodiments, the filter column 210 and the filter beam 220 are cast in stages. First, a filter column 210 template is built at the bottom of the filter tank. After the filter column 210 is cast and cured to the preset strength, a filter beam 220 template is built on top of the filter column 210. Then, the filter beam 220 is cast and cured.

[0067] The pre-embedded interval of adjacent anchor bolts 221 is a fixed spacing, forming standardized anchoring points, which enables standardized construction, simplifies construction steps, and saves construction time.

[0068] Please continue reading. Figure 3 and Figure 9 .

[0069] S300. Prefabricate filter plates 100 of a preset module outside the filter tank, hoist the filter plates 100 onto the frame 200, and splice multiple filter plates 100 together to form a joint, thereby creating a gap between the filter plates 100 and the inner wall of the filter tank.

[0070] Understandably, construction workers can control the width of the joints and gaps as needed.

[0071] S400. Fill the joints and gaps with fine aggregate concrete. After the fine aggregate concrete hardens, it forms a fine aggregate concrete layer 400.

[0072] Before filling with fine aggregate concrete, clean the joints and gaps with an air gun. After injecting the fine aggregate concrete, compact it with a vibrator. Smooth the surface and cover it with a curing film to keep it moist.

[0073] S500. The filter plate 100 is fixed to the frame 200 by the fastening assembly 300, and the filter plate 100 is fixed to the filter tank by the fixing assembly 500.

[0074] Anchor bolts 221 are spaced apart along the width direction of filter plate 100. As a result, fastening components 300 are also spaced apart along the width direction of filter plate 100. For example, the first set of fastening components 300 is set at the midpoint of the short side of filter plate 100, and the first set of fastening components 300 can fix two filter plates 100 in the same column; the second set of fastening components 300 is set at the corner of filter plate 100, and the second set of fastening components 300 can fix two columns of filter plates 100 (i.e., four filter plates 100).

[0075] Taking the fastening assembly 300 to fix four filter plates 100 as an example, a symmetrical tightening process is adopted when locking, and the torque is applied in two stages to ensure that the four filter plates 100 are synchronously pressed onto the filter beam 220, and the displacement of the joint is ≤0.3mm.

[0076] After the backwashing filter plate structure is constructed, a filter media layer (not shown in the figure) is placed on top of the backwashing filter plate structure. The filter media layer is used to filter wastewater. During the 100% backwashing of the filter plate, the filter media layer will also be backwashed, which improves the service life of the filter media layer.

[0077] The backwashing principle of filter plate 100 is explained here: Stop filtration and drain: Close the water inlet and open the drain to drain the filter media up to 0.3-0.5m above the filter media layer to avoid direct exposure of the filter media layer.

[0078] Air washing loosening: Air is introduced into the through hole 140 through the backwash pipe for 2-3 minutes. The air pressure is less than 0.1MPa and the pressure is 10-15 L / (m²·s). While avoiding the loss of filter media, the filter media layer is stirred and the caking is broken.

[0079] Combined air-water flushing: Air and water are introduced into the through hole 140, and air and water are flushed simultaneously for 5-8 minutes. The air-water ratio is precisely controlled (e.g., air-water ratio of 3:1), and the water intensity is 4-6 L / (m²·s) to deeply clean the gaps between the filter media.

[0080] Water rinsing: Input water into the through hole 140 for 4-6 minutes, with a water intensity of 8-12 L / (m²·s). The water flow carries impurities to the drainage channel 10. Observe the turbidity of the drainage until it is ≤10 NTU.

[0081] If the turbidity of the drainage does not meet the requirements, repeat one or more of the steps of air washing to loosen, combined air and water rinsing, and water washing. If the turbidity of the drainage meets the requirements, gradually turn on the water inlet after the filter media layer has stabilized to avoid water impact.

[0082] As mentioned above, the turbidity of wastewater is measured by an eddy current turbidometer to measure the solid suspended particles in the liquid. NTU (Nephelometric Turbidity Units) is a unit of turbidity, usually used to express the turbidity of water and describe the quantity or density of solid suspended particles in the water.

[0083] This embodiment solves the construction difficulties of the backwashing filter plate structure of ultra-low headroom filter by casting a frame 200 in place inside the filter tank and prefabricating filter plates 100 outside the filter tank, and then hoisting the filter plates 100 onto the frame 200 for splicing. It improves the construction safety factor, eliminates the need to remove the formwork materials, and speeds up the project progress.

[0084] Furthermore, this embodiment can reliably ensure that the suspended solids (SS) and chemical oxygen demand (COD) of the effluent are below the standard requirements, and its effluent quality fully meets the standards for deep treatment and high-purity reuse of wastewater in the semiconductor industry, providing reliable technical support for high-precision industrial wastewater treatment such as semiconductor chip manufacturing.

[0085] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0086] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A backwashing filter plate structure, characterized in that, The device includes a frame, fastening components, and a filter plate. The filter plate includes a plate-shaped main body made of precast concrete. The main body includes a first surface, a second surface, and four side surfaces. The first surface and the second surface are arranged parallel to each other. The four side surfaces are connected end to end, and each side surface includes a first joint surface and a second joint surface that are adjacent to each other. The first joint surface and the second joint surface are arranged at an angle away from the main body. The first joint surface is adjacent to the first surface, and the second joint surface is adjacent to the second surface. The main body is provided with a through hole that is disposed through the first surface and the second surface. The frame is pre-embedded with anchor bolts, and multiple filter plates are arrayed and overlapped on the frame. At least one anchor bolt is provided between two adjacent filter plates. The height of the exposed end of the anchor bolt is higher than the installation height of the filter plate. The fastening component cooperates with the anchor bolt to fix the filter plate. The side of one of the filter plates and the side of the adjacent filter plate together define a joint, which is filled with a fine stone concrete layer. The upper surface of the fine stone concrete layer is flush with the first surface of the filter plate, and the lower surface of the fine stone concrete layer is flush with the second surface of the filter plate. The cross-section of the fine stone concrete layer gradually narrows from the middle to both ends.

2. The backwashing filter plate structure as described in claim 1, characterized in that, The main body has a reference surface, which is located at the midpoint of the distance between the first surface and the second surface. The first seam surface and the second seam surface are symmetrically distributed with respect to the reference surface.

3. The backwashing filter plate structure as described in claim 1 or 2, characterized in that, The through hole is provided with internal threads.

4. The backwashing filter plate structure as described in claim 1, characterized in that, The fastening assembly includes a fastening plate, a washer, and a nut. The fastening plate is sleeved on the anchor bolt and covers at least two of the filter plates. The washer is located on the side of the fastening plate away from the filter plates, and the nut is located on the side of the washer away from the fastening plate. The nut is screwed to the anchor bolt.

5. The backwashing filter plate structure as described in claim 4, characterized in that, It also includes a fixing component, which includes a fixing plate, a washer, and an expansion bolt. The fixing plate includes a first fixing part and a second fixing part. The first fixing part is perpendicularly adjacent to the second fixing part and presses against the filter plate. The washer is sleeved on the expansion bolt and the expansion bolt passes through the second fixing part.

6. A method for constructing a backwashing filter plate structure, characterized in that, The method for constructing the backwashing filter plate structure according to claim 5 includes: The installation scheme of the backwash filter plate structure was designed through 3D modeling, and the filter plate module, the frame casting location, and the anchor bolt pre-embedding location were determined. The frame is cast in place inside the filter tank, and anchor bolts are pre-embedded at the pre-embedded locations according to the design plan; Prefabricated filter plates of a predetermined module are installed outside the filter tank. The filter plates are hoisted onto the frame and multiple filter plates are spliced ​​together to form a joint. A gap is formed between the filter plates and the inner wall of the filter tank. Fill the joints and gaps with fine aggregate concrete, which hardens to form a fine aggregate concrete layer. The filter plate is fixed to the frame by fastening components, and the filter plate is fixed to the filter tank by fixing components.

7. The construction method for the backwashing filter plate structure as described in claim 6, characterized in that, Before filling with fine aggregate concrete, clean the joints and gaps with an air gun. After injecting the fine aggregate concrete, compact it with a vibrator. Smooth the surface and cover it with a curing film to keep it moist.

8. The construction method for the backwashing filter plate structure as described in claim 7, characterized in that, The pre-embedded intervals of adjacent anchor bolts are fixed, forming standardized anchoring points.

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