A unidirectional flow-guiding anti-clogging device and construction method

Abstract

This invention belongs to the technical field of drainage ditch lining drainage systems, and relates to a unidirectional flow-guiding anti-siltation device and construction method. It includes a double-cylinder check valve for connecting the inner cavity of the drainage ditch to the water conveyance channel. The double-cylinder check valves are detachably arrayed and installed on the slope of the drainage ditch. The double-cylinder check valves are filled with geotextile, and the outlet of the double-cylinder check valve is covered with a wire mesh cap. This invention uses a double-cylinder check valve structure, which enhances unidirectional flow performance through a double chamber filled with geotextile. It allows water flow while intercepting fine sand and mud, preventing siltation at the valve outlet. It also clears the lining gaps, ensuring timely and effective release of seepage pressure in the lining structure under high groundwater levels, preventing lining bulging and cracking. The wire mesh cap at the outlet further physically blocks large particles of impurities, significantly reducing the risk of internal blockage.

Description

Technical Field

[0001] This invention relates to the field of drainage system lining, and more particularly to a unidirectional flow-guiding anti-clogging device and construction method. Background Technology

[0002] In large-scale water conservancy and drainage projects, the seepage pressure from high groundwater levels is a core factor threatening the safety of the lining structure.

[0003] Traditional drainage pipes often suffer from backflow due to the lack of unidirectional flow design. Furthermore, being exposed to groundwater for extended periods, fine sand and mud easily accumulate at the valve inlet, leading to pressure relief failure and subsequently causing lining heave, cracking, or even overall instability. Most current check valves are fixed to the lining structure; once they fail, the concrete must be broken up for repair, resulting in extremely high costs and damage to the main structure. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a unidirectional flow-guiding anti-clogging device and construction method.

[0005] The technical solution of the present invention is achieved through the following scheme: a one-way flow guide and anti-clogging device, including a double-cylinder check valve for connecting the inner cavity of the drainage ditch and the water conveyance channel, the double-cylinder check valve is detachably arrayed and installed on the slope of the drainage ditch, the double-cylinder check valve is filled with geotextile, and the outlet of the double-cylinder check valve is covered with a wire mesh cap.

[0006] The above technical solutions employ a double-cylinder check valve structure, which enhances unidirectional flow performance through a double-chamber design filled with geotextile. This allows water to flow through while intercepting fine sand and mud, preventing siltation at the valve opening. Furthermore, pipes are installed to clear the lining gaps, ensuring timely and effective release of seepage pressure in the lining structure under high groundwater levels, preventing lining bulging and cracking. The outlet is covered with a wire mesh cap to further physically block large particles of impurities, significantly reducing the risk of internal blockage.

[0007] Preferably, the dual-cylinder check valve includes an inlet filter outer cylinder and a check overflow inner cylinder. The check overflow inner cylinder is sealed and snapped into the inlet filter outer cylinder by a sealing component. The inlet filter outer cylinder is screwed onto the irregular-shaped pipe transition piece. The geotextile is filled in the inner cavity of the inlet filter outer cylinder. The water inlet of the check overflow inner cylinder is located in the inner cavity of the inlet filter outer cylinder and abuts against the geotextile. The drainage ditch includes several slope concrete lining slabs, a bottom concrete lining layer, and a soil foundation. Slope gaps are formed between adjacent slope concrete lining slabs, and bottom gaps are formed between the slope concrete lining slabs and the bottom concrete lining layer. A water conveyance channel is laid in the soil foundation. The water conveyance channel includes several water collection pipes and several water delivery pipes. The water collection pipes and water delivery pipes are covered with a geotextile permeable layer. The slope gaps connect to the water collection pipes, and the bottom gaps connect to the water delivery pipes.

[0008] Preferably, a sealing cap is screwed onto the outer inlet filter cylinder, the sealing cap abuts against the sealing assembly, the outlet of the non-return overflow inner cylinder passes through the sealing cap, and a wire mesh cap is screwed onto the exposed end of the non-return overflow inner cylinder.

[0009] Through the above technical solutions, the inner anti-backflow overflow cylinder can be disassembled and separated at any time within the inlet filter outer cylinder. When maintenance or replacement is required due to long-term use, only partial disassembly is needed, without breaking the concrete lining, which significantly reduces the difficulty of maintenance and damage to the main structure, saving later operation and maintenance costs. By filtering before stopping, it avoids the interference of blockage on the anti-backflow function and allows the anti-backflow structure to focus on preventing backflow, significantly improving reliability. The sealing components and sealing cover form a double sealing barrier, completely eliminating water leakage from the gap between the inner and outer cylinders and ensuring the uniqueness of the pressure relief path.

[0010] Preferably, the inlet filter outer cylinder includes a gap retainer and a concealed pipe connector. The inner cavity of the gap retainer has a retaining groove at the end away from the concealed pipe connector. The inner cavity of the gap retainer communicates with the concealed pipe connector. Several protrusions are arranged in a ring array on the inner cavity of the gap retainer, and a through groove is provided between adjacent protrusions. The backflow prevention overflow inner cylinder is engaged in the inner cavity of the gap retainer through the protrusions. The geotextile is located between the concealed pipe connector and the backflow prevention overflow inner cylinder. Sealing components are installed on the retaining groove and the through groove. The sealing cap is screwed onto the end of the gap retainer away from the concealed pipe connector.

[0011] Through the above technical solutions, the annular array of protrusions provides a rigid positioning fulcrum for the backflow prevention and overflow inner cylinder, so that the inner cylinder is stably clamped in the center of the gap seat cavity, avoiding shaking or displacement under the impact of water flow, and ensuring that the water inlet of the backflow prevention and overflow inner cylinder always uniformly abuts against the geotextile. The sealing component seals the groove to form a sealing barrier, blocking water leakage.

[0012] Preferably, the backflow prevention inner cylinder includes a gap clamp and an overflow pipe. The gap clamp has a water passage cavity inside, which is connected to the overflow pipe. The outer wall of the gap clamp is provided with a locking protrusion that matches the protrusion seat. A drain baffle is movably installed in the end of the overflow pipe away from the gap clamp.

[0013] Preferably, the drain baffle is adapted to the inner cavity of the overflow pipe, the drain baffle is movably installed on the overflow pipe via a fixed shaft, the fixed shaft is connected to the drain baffle via a spring-loaded hinge, and a symmetrically arranged limiting baffle is installed inside the overflow pipe, the limiting baffle abuts against the drain baffle, and the limiting baffle is located between the drain baffle and the gap clamp.

[0014] Through the above technical solutions, an automatic backflow prevention system is formed by a drain baffle, a spring-loaded hinge, and a limit baffle, which realizes the automatic switching of forward conduction and reverse self-locking. The elastic resistance of the spring-loaded hinge, together with the rigid resistance of the limit baffle, completely blocks the backflow path. The precise embedded positioning of the locking protrusion and the convex seat ensures that the inner cylinder has no relative displacement when subjected to water flow impact or pressure fluctuation.

[0015] Preferably, the sealing assembly includes a retaining ring and a retaining block, the retaining block engaging with a groove, the retaining ring being installed in the retaining ring groove and abutting against the retaining block, and the top surface of the boss abutting against the disc portion of the retaining block.

[0016] Preferably, the sealing cap abuts against the disc portion of the retaining block.

[0017] Through the above technical solutions, the locking rubber block and the through groove engage and embed to form a mechanical interlock, and the snap ring and sealing cover abut against the locking rubber block in both directions to form a double fixation, completely eliminating the displacement of the seal. This makes the inner cavity of the inlet filter outer cylinder and the backflow overflow inner cylinder form a closed space, completely avoiding the risk of leakage caused by loose seal.

[0018] A construction method for a unidirectional flow guidance and anti-clogging device includes the following steps: Step A: Substrate preparation and subbase laying; Step B: Geomembrane laying and reinforcement; Step C: Concealed pipe installation; Step D: Pour concrete and pre-drill installation holes; Step E: Install the double-cylinder check valve.

[0019] Preferably, in step E, the inlet filter outer cylinder is screwed onto the irregular-shaped pipe, and the gap between the outer wall of the inlet filter outer cylinder and the concrete is filled with expanding cement mortar. After the inlet filter outer cylinder is installed for ≥3 days, geotextile is filled into the inner cavity of the inlet filter outer cylinder, the check overflow inner cylinder is inserted and interlocked with the inlet filter outer cylinder, the sealing component and sealing cover are installed, and the exposed end of the check overflow inner cylinder is covered with a wire mesh cover. The top of the double-cylinder check valve is 1-2 cm away from the surface of the slope concrete lining plate. A small plastic sheet or cardboard is used as a pad to press on the top of the wire mesh cover, and cement mortar is applied to form a cement mortar protective cover, which is flush with the concrete surface of the slope concrete lining plate.

[0020] In summary, the present invention has the following beneficial effects: 1. This invention employs a double-cylinder check valve structure, which enhances unidirectional conduction performance through a double chamber filled with geotextile. While allowing water flow, it intercepts fine sand and mud, preventing siltation at the valve orifice. Furthermore, it clears the lining gaps through pipes, ensuring timely and effective release of seepage pressure in the lining structure under high groundwater levels, preventing lining bulging and cracking. The outlet is covered with a wire mesh cap, further physically blocking large particles of impurities and significantly reducing the risk of internal blockage.

[0021] 2. The inner anti-backflow overflow cylinder can be disassembled and separated at any time within the inlet filter outer cylinder. When maintenance or replacement is required due to long-term use, only partial disassembly is needed, without breaking the concrete lining. This significantly reduces maintenance difficulty and damage to the main structure, saving on later operation and maintenance costs. By filtering before stopping, it avoids interference with the anti-backflow function due to blockage, and allows the anti-backflow structure to focus on preventing backflow, significantly improving reliability. The sealing components and sealing cover form a double sealing barrier, completely eliminating water leakage from the gap between the inner and outer cylinders and ensuring the uniqueness of the pressure relief path.

[0022] 3. The annular array of protrusions provides a rigid positioning fulcrum for the backflow prevention and overflow inner cylinder, so that the inner cylinder is stably locked in the center of the gap seat cavity, avoiding shaking or displacement under the impact of water flow, and ensuring that the water inlet of the backflow prevention and overflow inner cylinder always uniformly abuts against the geotextile. The sealing component seals the groove to form a sealing barrier and blocks water leakage.

[0023] 4. An automatic backflow prevention system is formed by a drain baffle, a spring-loaded hinge, and a limit baffle, which realizes automatic switching between forward conduction and reverse self-locking. The elastic resistance of the spring-loaded hinge, together with the rigid resistance of the limit baffle, completely blocks the backflow path. The precise embedded positioning of the locking protrusion and the convex seat ensures that the inner cylinder has no relative displacement when subjected to water flow impact or pressure fluctuation.

[0024] 5. The locking rubber block and the through groove engage to form a mechanical interlock. The snap ring and the sealing cover abut against the locking rubber block in both directions to form a double fixation, completely eliminating the displacement of the seal. This makes the inner cavity of the inlet filter outer cylinder and the backflow overflow inner cylinder form a closed space, completely avoiding the risk of leakage caused by loose seal.

[0025] 6. The gaps in the slope and the gaps in the bottom of the canal are connected to the water collection pipe and the water delivery pipe respectively, forming a three-dimensional drainage network covering the slope and the bottom of the canal, which collects seepage water from different parts in a targeted manner; in conjunction with the concealed arrangement of the pipes and the isolation and protection of the geotextile seepage layer, the drainage path is ensured to be unobstructed, the efficiency of groundwater drainage is comprehensively improved, and the stability of the lining structure is further enhanced. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the channel assembly structure of the present invention; Figure 2 This is a schematic diagram of the internal planar structure of the channel body according to the present invention; Figure 3 This is a three-dimensional structural diagram of the double-cylinder check valve of the present invention; Figure 4 This is a schematic diagram of the planar structure of the double-cylinder check valve of the present invention; Figure 5 This is a bottom view schematic diagram of the double-cylinder check valve of the present invention; Figure 6 This is a three-dimensional structural diagram of the double-cylinder check valve of the present invention after the steel wire mesh cover is removed; Figure 7 This is a top view of the double-cylinder check valve of the present invention after the sealing cap and wire mesh cap have been removed; Figure 8 This is a schematic diagram of the internal cross-sectional structure of the present invention; Figure 9 This is an exploded structural diagram of the sealing assembly of the present invention; Figure 10 This is a cross-sectional view of the exploded structure of the inlet filter outer cylinder and the backflow prevention overflow inner cylinder of the present invention; Figure 11 This is a schematic diagram of the overflow pipe structure of the present invention; Figure 12 This is a top-view schematic diagram of the overflow pipe of the present invention; Figure 13 This is a flowchart illustrating the implementation of the present invention; Figure 14 This is a three-dimensional structural diagram of the sealing cap and sealing assembly in their installation state according to the present invention; Figure 15 This is a schematic diagram of the three-dimensional structure of the sealing cap of the present invention; Figure 16 This is a schematic diagram of the assembly and connection of the water collection pipe, the water supply pipe, and the double-cylinder check valve of the present invention.

[0027] Explanation of reference numerals in the attached drawings: 100, slope concrete lining slab; 101, channel bottom concrete lining layer; 102, slope joint; 103, channel bottom joint; 104, water collection pipe; 105, water delivery pipe; 106, geotextile permeable layer; 107, subgrade; 1. Double-cylinder check valve; 11. Inlet filter outer cylinder; 111. Gap retainer; 1111. Plug; 1112. Snap ring groove; 112. Concealed pipe connector; 113. Sealing cap; 1131. Sealing ring; 12. Inner cylinder for preventing backflow and overflow; 121. Gap clamp; 122. Overflow pipe; 1221. Drain baffle; 1222. Fixed shaft; 12221. Spring-loaded hinge; 1223. Limit baffle; 2. Sealing components; 21. Snap rings; 22. Seter blocks; 3. Geotextiles; 4. Wire mesh caps; 5. Irregularly shaped pipes. Detailed Implementation

[0028] To better understand the above-mentioned objectives, features and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein. Therefore, the invention is not limited to the specific embodiments disclosed in the following specification. The invention will be further described in detail below with reference to the accompanying drawings.

[0030] Example 1: A unidirectional flow guidance and anti-clogging device, such as Figures 1-16 As shown, it includes a double-cylinder check valve 1 for connecting the inner cavity of the drainage ditch with the water conveyance channel. The double-cylinder check valve 1 is detachably arrayed and installed on the slope of the drainage ditch.

[0031] The drainage ditch includes several slope concrete lining slabs 100, a bottom concrete lining layer 101, and a soil foundation 107. Slope joints 102 are formed between adjacent slope concrete lining slabs 100, and bottom joints 103 are formed between the slope concrete lining slabs 100 and the bottom concrete lining layer 101. Although the joints of multiple slope concrete lining slabs 100 are connected and sealed with adhesive grout, water seepage will still occur over long-term use. The same applies to the bottom joints 103. The soil foundation 107... The 7 is equipped with several water collection pipes 104 and several water delivery pipes 105. The water collection pipes 104 and water delivery pipes 105 are covered with a geotextile permeable layer 106. Several installation holes are arrayed on the slope concrete lining slab 100. A double-cylinder check valve 1 is detachably installed in the installation hole. The double-cylinder check valve 1 is connected to the water collection pipes 104 and water delivery pipes 105 through a transition piece 5. The double-cylinder check valve 1 is filled with geotextile 3. The outlet of the double-cylinder check valve 1 is covered with a wire mesh cap 4.

[0032] The slope gap 102 is connected to the water collection pipe 104, and the channel bottom gap 103 is connected to the water delivery pipe 105. The water collection pipe 104 has two types: longitudinal pipe and vertical pipe. The longitudinal pipe collects groundwater in the soil foundation 107, and the vertical pipe is attached to the slope gap 102 to collect the seepage water from the slope gap 102. The water delivery pipes 105 are all horizontal pipes. The water delivery pipes 105 near the channel bottom gap 103 collect the seepage water from the channel bottom gap 103.

[0033] The geotextile permeable layer 106 surrounding the underground pipe serves as a filter layer, preventing fine particles from the soil 107 from entering the underground pipe and causing siltation, while allowing water to pass freely.

[0034] When too much water accumulates in the concealed pipe, it is released through the double-cylinder check valve 1.

[0035] The irregular-shaped pipe 5 is a five-way ferry.

[0036] like Figure 3 , Figure 4 , Figure 8 , Figure 10 and Figure 16 As shown, the double-cylinder check valve 1 includes an inlet filter outer cylinder 11 and a check overflow inner cylinder 12. The check overflow inner cylinder 12 is sealed and snapped into the inlet filter outer cylinder 11 by a sealing assembly 2. The inlet filter outer cylinder 11 is screwed onto the transition piece of the special-shaped pipe 5. Geotextile 3 is filled in the inner cavity of the inlet filter outer cylinder 11. The inlet of the check overflow inner cylinder 12 is located in the inner cavity of the inlet filter outer cylinder 11 and abuts against the geotextile 3. The inlet filter outer cylinder 11 serves as a basic support structure and is screwed onto the transition piece of the special-shaped pipe 5 to provide installation support for the internal components. Its inner cavity is filled with geotextile 3 for filtration. The check overflow inner cylinder 12 compacts the geotextile 3 to fix it in the inner cavity of the inlet filter outer cylinder 11, and the geotextile 3 also stabilizes the check overflow inner cylinder 12 in the inner cavity of the outer cylinder.

[0037] A sealing cap 113 is screwed onto the inlet filter outer cylinder 11. The sealing cap 113 abuts against the sealing component 2. The outlet of the backflow overflow inner cylinder 12 passes through the sealing cap 113. A wire mesh cap 4 is screwed onto the exposed end of the backflow overflow inner cylinder 12. A sealing ring 1131 is provided at the contact point between the sealing cap 113 and the backflow overflow inner cylinder 12. The sealing cap 113 protects the sealing component 2 and also effectively prevents water from entering the sealing area of ​​the inlet filter outer cylinder 11 and the backflow overflow inner cylinder 12 when the backflow overflow inner cylinder 12 drains.

[0038] like Figure 5 , Figure 8 , Figure 9 and Figure 10 As shown, the inlet filter outer cylinder 11 includes a gap retainer 111 and a concealed pipe connector 112. A retaining groove 1112 is formed in the end of the gap retainer 111 away from the concealed pipe connector 112. The inner cavity of the gap retainer 111 communicates with the concealed pipe connector 112. A plurality of protrusions 1111 are arranged in a circular array on the inner cavity of the gap retainer 1111, with through grooves between adjacent protrusions 1111. The backflow prevention overflow inner cylinder 12 is engaged in the inner cavity of the gap retainer 111 through the protrusions 1111. The geotextile 3 is located between the concealed pipe connector 112 and the backflow prevention overflow... A sealing assembly 2 is installed between the inner cylinders 12, on the retaining spring groove 1112 and the through groove. The sealing cover 113 is screwed onto the end of the gap seat 111 away from the concealed pipe joint 112. The concealed pipe joint 112 at the bottom of the inlet filter outer cylinder 11 is provided with a threaded interface and screwed onto the irregularly shaped through pipe 5. The boss 1111 is an n-shaped protrusion. The through groove provides an installation channel for the backflow prevention overflow inner cylinder 12. After the backflow prevention overflow inner cylinder 12 is snapped in, the through groove is sealed and locked by the sealing assembly 2. The gap seat 111 and the concealed pipe joint 112 are integrally formed.

[0039] The preferred number of protrusions 1111 is twelve, arranged in a 30-degree circular array.

[0040] The spring groove 1112 is an annular groove. The geotextile 3 is naturally positioned by utilizing the space inside the gap seat 111. The filtration area is large and there are no dead corners. The inlet of the backflow preventer 12 is attached to the geotextile 3 to form a surface filtration. The inner cavity of the gap seat 111 is a small, downward-facing frustum cavity, ensuring that the water in the inner cavity after filtration will enter the inlet of the backflow preventer 12.

[0041] like Figure 14 and Figure 15 As shown, the sealing cover 113 abuts against the disc portion of the retaining block 22. The sealing cover 113 is circular, and its locking end has a receiving groove to accommodate the disassembly post of the retaining spring 21 and the handle of the retaining block 22. One side wall has a thread that matches the end of the gap clip 121, and the other side abuts against the disc end of the retaining block 22 that is not pressed by the retaining spring 21. It cooperates with the retaining spring 21 to provide double pre-tightening force to the retaining block 22. The center of the sealing cover 113 has a circular through hole that matches the overflow pipe 122 of the backflow overflow inner cylinder 12. A sealing ring 1131 is provided inside to ensure that the two fit tightly.

[0042] like Figure 3 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 As shown, the overflow inner cylinder 12 includes a gap clamp 121 and an overflow pipe 122. The gap clamp 121 has a water passage cavity. The gap clamp 121 is a frustum-shaped shell, and its large circular end is connected to the overflow pipe 122. It is a smooth transition integrally formed. The water passage cavity is connected to the overflow pipe 122. The outer wall of the gap clamp 121 is provided with a locking protrusion that matches the boss 1111. The locking protrusion and the boss 1111 are also distributed in a ring array. Simply align the locking protrusion of the gap clamp 121 with the groove and insert it until the locking protrusion is submerged. Then rotate it 30 degrees and pull it upwards to make the locking protrusion engage with the groove in the boss 1111, so as to achieve radial limiting and axial fixing. A drain baffle 1221 is movably installed in the end of the overflow pipe 122 away from the gap clamp 121.

[0043] The fixed shaft 1222 is fixedly installed inside the overflow pipe 122 and is integrally formed.

[0044] The drain baffle 1221 is adapted to the inner cavity of the overflow pipe 122. The drain baffle 1221 is movably installed on the overflow pipe 122 via a fixed shaft 1222. The fixed shaft 1222 is connected to the drain baffle 1221 via a spring-loaded hinge 12221. A symmetrically arranged limiting baffle 1223 is installed inside the overflow pipe 122. The limiting baffle 1223 abuts against the drain baffle 1221. The limiting baffle 1223 is located between the drain baffle 1221 and the gap clamp 121. The limiting baffle 1223 can be an arc-shaped plate or a plate of other shapes, as long as it can support the drain baffle 1221. The drain baffle 1221 is composed of two fan-shaped composite material plates with an area slightly smaller than the cross-sectional area of ​​the inner cavity of the overflow pipe 122. Sealing strips are provided on its edges. After the sealing strips are added, the area of ​​the two fan-shaped drain baffles 1221 is adapted to the cross-sectional area of ​​the inner cavity of the overflow pipe 122.

[0045] The preferred material for the wire mesh cover 4 is 316 stainless steel.

[0046] like Figure 7 , Figure 8 , Figure 9 and Figure 14 As shown, the sealing assembly 2 includes a retaining spring 21 and a retaining block 22. The retaining block 22 engages with the groove. The retaining spring 21 is installed in the retaining spring groove 1112 and abuts against the retaining block 22. The top surface of the boss 1111 abuts against the disc portion of the retaining block 22. The retaining spring 21 is arc-shaped and has disassembly posts installed at both ends. The disc end of the retaining block 22 is equipped with a handle. The handle and the disassembly post are located in the same arc-shaped plane. The retaining block 22 consists of a circular disc and a block below the disc. Its annular distribution is consistent with the groove distribution. The retaining spring 21, together with the sealing cover 113, applies a pre-tightening force to the retaining block 22, which enhances the overall sealing effect and ensures the reliability and stability of the equipment under high flow or high pressure. It can be easily disassembled during maintenance.

[0047] Both the inlet filter outer cylinder 11 and the backflow preventer overflow inner cylinder 12 are made of rigid plastic. The geotextile 3, wire mesh cover 4, backflow preventer overflow inner cylinder 12, snap ring 21, locking rubber block 22 and sealing cover 113 are all independent modules. During disassembly and maintenance, disassembly and maintenance can be carried out without damaging the structure of the inlet filter outer cylinder 11.

[0048] When cleaning the geotextile 3, first unscrew the wire mesh cover 4, then unscrew the sealing cover 113 and slide it upward along the side wall of the anti-reverse overflow inner cylinder 12. Press the spring clip 21 to release the spring clip 21 from the fixing column, pull out the fastening block 22, press down on the anti-reverse overflow inner cylinder 12, and then rotate and pull outward to release the inner cylinder from the outer cylinder. Then use pliers to clamp out the old geotextile 3 and fill it with new fabric. When it is necessary to replace the anti-reverse overflow inner cylinder 12 or the wire mesh cover 4, simply unscrew the corresponding parts without damaging the outer cylinder or lining structure.

[0049] When the filtered water from the outer filter cylinder 11 enters the water passage chamber of the inner check cylinder, the water flows along the gap clamp 121 and the water passage chamber. The positive water pressure overcomes the elastic force of the spring-loaded hinge 12221, pushing the drain baffle 1221 to flip outward around the fixed shaft 1222 and open, allowing the water to flow out smoothly. When external water wants to enter, the reverse water pressure acts on the drain baffle 1221, and the elastic force of the spring-loaded hinge 12221 drives the baffle to close inward. At the same time, the symmetrically arranged limiting baffles 1223 abut against the drain baffle 1221 to form a rigid contact, enhancing the seal and completely blocking the backflow path.

[0050] Example 2: A construction method for a unidirectional flow guidance and anti-clogging device, such as... Figures 1-16 As shown, it includes the following steps: Step A: Substrate preparation and subbase laying; Remove humus, tree roots, gravel, and other debris from the original soil surface of the drainage ditch slope. Backfill and compact any local depressions with plain soil to ensure that there are no loose soil clods on the base surface and that the overall flatness deviation is ≤5cm / 2m. Use a vibratory roller to compact the base layer in layers, each 20-30cm thick, with a compaction degree ≥90%. Use the ring cutter method for testing to prevent structural deformation caused by later settlement. Evenly lay a 10cm thick graded crushed stone cushion layer with a particle size of 5-20mm on the base surface and compact it with a plate rammer. The slope of the cushion layer surface should be consistent with the design slope ratio of the drainage ditch at 1:1.5 to ensure smooth drainage.

[0051] Step B: Geomembrane laying and reinforcement; The preferred method is to use a composite geomembrane consisting of two layers of fabric and one layer of membrane. The geomembrane should be cut to the actual length of the drainage ditch slope plus 0.5m, and the width should cover the entire width of the slope plus 0.3m on each side, with a margin for edge pressing. The geomembrane should be unfolded along the slope from top to bottom, manually flattened, and temporarily fixed to the slope with U-shaped steel nails at 50cm intervals, ensuring no wrinkles or damage. The overlap width between membranes should be ≥15cm, and hot-melt welding should be used. The weld should be vacuum tested at a negative pressure of 0.02MPa and kept at that pressure for 5 minutes without leakage.

[0052] At the corners where the geomembrane meets the concrete structure, an additional layer of geotextile of the same specification is laid as a reinforcement layer. The reinforcement fabric is then fixed to the base layer with a nail gun to prevent the geomembrane from being punctured during concrete pouring.

[0053] Step C: Concealed pipe installation; Water delivery pipe 105 and channel bottom gap 103 are arranged in parallel array on the slope of the drainage ditch, while water collection pipe 104 and slope gap 102 are arranged in parallel array on the slope of the drainage ditch. Both are φ150 flexible permeable pipes, wrapped with geotextile permeable layer 106 on the outside. A special-shaped through pipe 5 is installed at the junction of water delivery pipe 105 and water collection pipe 104.

[0054] The branch outlet of the irregular-shaped pipe 5 faces the outside of the drainage ditch and corresponds to the installation position of the double-cylinder check valve 1.

[0055] After the underground pipe is laid, the pipe body is encased in C20 plain concrete.

[0056] Step D: Pour concrete and pre-drill installation holes; The slope concrete lining slab 100 and the channel bottom concrete lining layer 101 are poured. During the construction of the slope concrete lining slab 100, a φ110mm plastic sleeve or steel pipe is used as a pre-reserved hole mold to cover the irregular pipe 5 at the intersection of each water collection pipe 104 and water delivery pipe 105. Before the concrete sets, the mold is pulled out to form a hole. After the concrete sets, a double-cylinder check valve 1 is installed.

[0057] Step E: Install double-cylinder check valve 1; The inlet filter outer cylinder 11 is screwed onto the irregular-shaped pipe 5. The gap between the outer wall of the inlet filter outer cylinder 11 and the concrete is filled with expanding cement mortar. After the inlet filter outer cylinder 11 is installed for ≥3 days, before the mortar sets, the outer cylinder is gently tapped with a wooden mallet to ensure compaction. Geotextile 3 with a thickness of 20cm is filled into the inner cavity of the inlet filter outer cylinder 11 as a coarse filter layer. The backflow overflow inner cylinder 12 is inserted and interlocked with the inlet filter outer cylinder 11. The sealing component 2 and the sealing cover 113 are installed, and the exposed end of the backflow overflow inner cylinder 12 is fitted with a wire mesh cover 4. The top of the double-cylinder check valve 1 is 1-2cm away from the surface of the slope concrete lining slab 100. A small plastic sheet or cardboard is used as a pad to press on the top of the wire mesh cover 4, and cement mortar is applied to form a cement mortar protective cover, which is flush with the concrete surface of the slope concrete lining slab 100.

[0058] After the inlet filter outer cylinder 11 is installed and fixed, align the gap clamp 121 of the backflow overflow inner cylinder 12 with the through groove in the gap clamp seat 111 of the inlet filter outer cylinder 11, insert the gap clamp 121 to the bottom until it abuts against the geotextile 3 in the gap clamp seat 111. When the worker feels resistance, further rotate the backflow overflow inner cylinder 12 until the locking protrusion of the gap clamp 121 is opposite to the protrusion 1111 of the gap clamp seat 111. At this time, start to pull upward to complete the assembly and installation of the two. Further align the locking rubber block 22 with each through groove and install it downward until it engages. Pinch the two disassembly pins of the retaining spring 21 to make the retaining spring 21 snap into the retaining spring groove 1112 to complete the sealing installation of the two. Next, a sealing cap 113 is fitted onto the overflow pipe 122 and slid down until it reaches the threaded end of the gap seat 111. The sealing cap 113 is then tightened. At this point, the wire mesh cap 4 is tightened at the end of the overflow pipe 122, thus completing the installation of the double-cylinder check valve 1.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A unidirectional flow guidance and anti-clogging device, characterized in that: Includes a double-cylinder check valve (1) for connecting the inner cavity of the drainage ditch with the water conveyance channel. The double-cylinder check valve (1) is detachably arrayed and installed on the slope of the drainage ditch. The double-cylinder check valve (1) is filled with geotextile (3). The outlet of the double-cylinder check valve (1) is fitted with a wire mesh cover (4).

2. The unidirectional flow guidance and anti-clogging device according to claim 1, characterized in that: The double-cylinder check valve (1) includes an inlet filter outer cylinder (11) and a check overflow inner cylinder (12). The check overflow inner cylinder (12) is sealed and snapped into the inlet filter outer cylinder (11) by a sealing assembly (2). The inlet filter outer cylinder (11) is screwed onto the transition piece of the shaped pipe (5). The geotextile (3) is filled in the inner cavity of the inlet filter outer cylinder (11). The water inlet of the check overflow inner cylinder (12) is located in the inner cavity of the inlet filter outer cylinder (11) and abuts against the geotextile (3). The drainage ditch includes several slope concrete lining slabs (100), a bottom concrete lining layer (101), and a soil base (107). Slope gaps (102) are formed between adjacent slope concrete lining slabs (100), and bottom gaps (103) are formed between the slope concrete lining slabs (100) and the bottom concrete lining layer (101). A water conveyance channel is laid in the soil base (107). The water conveyance channel includes several water collection pipes (104) and several water delivery pipes (105). The water collection pipes (104) and water delivery pipes (105) are covered with a geotextile permeable layer (106). The slope gaps (102) are connected to the water collection pipes (104), and the bottom gaps (103) are connected to the water delivery pipes (105).

3. The unidirectional flow guidance and anti-clogging device according to claim 2, characterized in that: A sealing cap (113) is screwed onto the inlet filter outer cylinder (11), the sealing cap (113) abuts against the sealing assembly (2), the outlet of the backflow overflow inner cylinder (12) passes through the sealing cap (113), and a wire mesh cap (4) is screwed onto the exposed end of the backflow overflow inner cylinder (12).

4. The unidirectional flow guidance and anti-clogging device according to claim 3, characterized in that: The inlet filter outer cylinder (11) includes a gap retainer (111) and a concealed pipe connector (112). The inner cavity of the gap retainer (111) is provided with a retaining groove (1112) at the end away from the concealed pipe connector (112). The inner cavity of the gap retainer (111) is connected to the concealed pipe connector (112). A plurality of protrusions (1111) are arranged in a ring array on the inner cavity of the gap retainer (1111). A through groove is provided between adjacent protrusions (1111). The backflow overflow inner cylinder (12) is engaged in the inner cavity of the gap retainer (1111) through the protrusions (1111). The geotextile (3) is located between the concealed pipe connector (112) and the backflow overflow inner cylinder (12). A sealing component (2) is installed on the retaining groove (1112) and the through groove. The sealing cap (113) is screwed to the end of the gap retainer (111) away from the concealed pipe connector (112).

5. The unidirectional flow guidance and anti-clogging device according to claim 4, characterized in that: The backflow prevention overflow inner cylinder (12) includes a gap clamp (121) and an overflow pipe (122). The gap clamp (121) has a water passage cavity, which is connected to the overflow pipe (122). The outer wall of the gap clamp (121) is provided with a locking protrusion that matches the protrusion (1111). A drain baffle (1221) is movably installed in the end of the overflow pipe (122) away from the gap clamp (121).

6. The unidirectional flow guidance and anti-clogging device according to claim 5, characterized in that: The drain baffle (1221) is adapted to the inner cavity of the overflow pipe (122). The drain baffle (1221) is movably installed on the overflow pipe (122) via a fixed shaft (1222). The fixed shaft (1222) is connected to the drain baffle (1221) via a spring-loaded hinge (12221). A symmetrically arranged limiting baffle (1223) is installed inside the overflow pipe (122). The limiting baffle (1223) abuts against the drain baffle (1221). The limiting baffle (1223) is located between the drain baffle (1221) and the gap clamp (121).

7. The unidirectional flow guidance and anti-clogging device according to claim 6, characterized in that: The sealing assembly (2) includes a retaining ring (21) and a retaining block (22). The retaining block (22) is engaged with a groove. The retaining ring (21) is installed in the retaining ring groove (1112) and abuts against the retaining block (22). The top surface of the boss (1111) abuts against the disc portion of the retaining block (22).

8. The unidirectional flow guidance and anti-clogging device according to claim 7, characterized in that: The sealing cap (113) abuts against the disc portion of the retaining block (22).

9. A construction method for a unidirectional flow guidance and anti-clogging device, characterized in that, The construction of a drainage ditch using the unidirectional flow guidance and anti-clogging device as described in claim 8 includes the following steps: Step A: Substrate preparation and subbase laying; Step B: Geomembrane laying and reinforcement; Step C: Concealed pipe installation; Step D: Pour concrete and pre-drill installation holes; Step E: Installation of the double-cylinder check valve (1).

10. The construction method of the unidirectional flow guidance and anti-clogging device according to claim 9, characterized in that: In step E, the inlet filter outer cylinder (11) is screwed onto the irregular pipe (5), and the gap between the outer wall of the inlet filter outer cylinder (11) and the concrete is filled with expanding cement mortar. After the inlet filter outer cylinder (11) is installed for ≥3 days, geotextile (3) is filled into the inner cavity of the inlet filter outer cylinder (11), the backflow overflow inner cylinder (12) is inserted and interlocked with the inlet filter outer cylinder (11), the sealing component (2) and the sealing cap (113) are installed, and the exposed end of the backflow overflow inner cylinder (12) is installed with a wire mesh cap (4). The top of the double cylinder check valve (1) is 1-2 cm away from the surface of the slope concrete lining plate (100). A small plastic sheet or cardboard is used as a pad to press on the top of the wire mesh cap (4), and cement mortar is applied to form a cement mortar protective cover, which is flush with the concrete surface of the slope concrete lining plate (100).

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