Blocking and inverted filtering structure and method for drainage port of drainage shaft of built slag storage

Abstract

The invention discloses a built slag reservoir drainage shaft drainage port plugging inverted filter structure and method, and belongs to the technical field of drainage shafts of harmful solid slag reservoirs such as ash storage fields and tailing ponds. The structure comprises a stress structure layer, a force transmission layer and an inverted filter layer; the force transmission layer is clamped between the stress structure layer and the inverted filter layer; the stress structure layer is provided with a water filtering opening; the inverted filter layer comprises a geotechnical mat wrapped by geotechnical cloth to form an inverted filter structure; the geotechnical mat can be plugged into the water outlet; the force transmission layer is of a porous sheet structure and is used for uniformly transmitting the load in the drainage direction of the drainage port to the stress structure layer; the periphery of the stress structure layer, the periphery of the force transmission layer and the periphery of the geotechnical cloth are fixed to the inner shaft wall of the drainage vertical shaft or the inner wall of the drainage port, and the geotechnical mat is plugged into the drainage port by a set depth to form a plugging inverted filtering structure. The problems that a built slag silo flood drainage system is damaged and adverse effects are caused to the ecological environment due to the fact that slag bodies are discharged into a drainage vertical shaft along with accumulated water in the silo are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of drainage shafts for harmful solid slag storages such as ash storage yards and tailings ponds, and specifically relates to a structure and method for blocking and filtering the drainage outlet of a drainage shaft for an existing slag storage, and is suitable for the design and construction of blocking and filtering the drainage outlet when the drainage outlet plug of a drainage shaft for harmful solid slag storages such as ash storage yards and tailings ponds fails. Background Art

[0002] A large amount of "waste residue" (tailings) generated after the ore is sorted in the mine dressing plant is usually discharged in the form of slurry. If not properly handled, it will cover a large area of ​​farmland and pollute the water system, causing serious harm to the environment. At the same time, the tailings often contain precious and rare metals that cannot be recovered at present, and it is not allowed to be discarded at will. The tailings pond is an overall system of various structures built to scientifically solve the above problems. The ash storage yard is a yard where the ash and slag after the power generation of wind power plants are concentrated and reasonably and safely piled up to prevent the ash and slag from harming the environment.

[0003] Tailings ponds and ash storage yards are equipped with flood discharge systems to discharge tailings, ash, clarified water and atmospheric precipitation in the reservoirs. Unlike reservoir flood discharge systems, the flood discharge systems of tailings ponds and ash storage yards must not only safely and timely discharge floods, but also ensure that tailings and ash do not leak from the flood discharge system, that is, water is drained but sand (slag) is not. Therefore, the flood discharge system of tailings ponds and ash storage yards is unique. It consists of two parts: water inlet structures and drainage structures. Drainage structures usually have flood discharge horizontal pipes, flood discharge culverts and other forms. Water inlet structures generally have drainage shafts and drainage chutes. At present, most tailings dams and ash dams are built by pushing tailings and ash into dams, and the dam height ranges from tens of meters to hundreds of meters. The biggest feature of the water inlet structure is that it can be extended and raised with the continuous rise of the tailings dam and ash dam. Drainage outlets and anti-filtration measures are set on the water inlet structure to ensure the drainage of the slag in the reservoir and prevent the tailings and ash from leaking from the flood discharge system. Since the continuous rise of the tailings dam and ash dam is a long-term gradual process, the blocking and anti-filtration treatment of the drainage outlet of the water inlet structure is also a long-term safety management measure that must be taken seriously. Any negligent failure in blocking any drainage outlet may cause the slag to flow from the drainage outlet into the flood discharge system, causing the entire flood discharge system to fail, thereby endangering the safety and stability of the tailings dam and ash dam, directly affecting the normal production of mines and power plants, and even endangering the safety of life and property of people downstream.

[0004] Whether the drainage shaft outlet in the flood discharge system of the tailings pond and ash storage yard can be safely blocked and the anti-filtration drainage effect can be guaranteed will directly affect the safety of the tailings pond and ash storage yard. In previous engineering practices, precast concrete plug structures are usually used to block the shaft outlets. For example, a Chinese invention patent with publication number CN202121411034.1 discloses a drainage shaft blocking structure, which involves using precast concrete blocks to block the drainage shaft outlets. Precast concrete blocks such as Figure 1 As shown, it is a wedge-shaped block with a large outside and a small inside, with drainage grooves set around it, and a water seepage layer, a grid layer, and a water filter layer anti-filtration structure set on the outside of the plug. With this precast concrete block structure, the drainage outlet of the drainage shaft wall can be blocked layer by layer as the slag filling height increases, and anti-filtration measures are set on the outside to prevent slag discharge.

[0005] However, the applicant noticed a problem in the actual project. Figure 2 As shown in the figure, the drainage shaft is a circular structure with many drainage outlets on each floor. To facilitate plugging and ensure the stability of the plug structure, the drainage shaft drainage outlet is designed as a regular, uniform-sized hole with a large outside and a small inside. In the actual construction process, due to the small size of the drainage shaft drainage outlet and the complex structural dimensions, the construction unit will inevitably encounter template size discrepancies, non-standard template erection, and mold running during the concrete casting process, resulting in the drainage outlet not being consistent with the design and non-standard size. In the later stage, it is impossible to plug it with the wedge-shaped precast concrete plug originally designed. Because of the size discrepancy, in order to facilitate construction, the size of the plug used to plug the drainage outlet of many projects' drainage shafts is not coordinated with the drainage outlet. There is a phenomenon that the plug is smaller than the drainage outlet, resulting in the inability of the drainage shaft wall to generate thrust on the plug. Eventually, the plug shifts and falls off, and the drainage shaft anti-filtration structure is torn at the orifice. The slag is discharged with rainwater into the flood discharge system, causing damage to the overall structure and adverse impacts on the ecological environment.

[0006] To summarize, for the existing slag storage, prefabricated concrete plugs are used to seal the drainage shaft drainage outlets. When inspections show that the drainage outlet plugs are displaced, fallen off, and the outer anti-filtration structure is torn, the drainage shaft drainage outlets need to be sealed, and anti-filtration drainage measures need to be considered to ensure the safety of the slag storage flood discharge system and avoid adverse impacts on the ecological environment. Summary of the invention

[0007] In view of this, the present invention provides a structure and method for blocking the drain outlet of a drainage shaft of an existing slag storage, which solves the problem that prefabricated concrete plugs are used to block the drain outlet of the drainage shaft of the existing slag storage, which is prone to plug displacement and falling off and tearing of the outer anti-filtration structure due to non-standard hole size, causing the slag to be discharged into the drainage shaft together with the accumulated water in the storage, thereby damaging the flood discharge system of the existing slag storage and causing adverse effects on the ecological environment.

[0008] The present invention provides a blocking and filtering structure for the drainage outlet of a built slag storage drainage shaft, which adopts the following technical solutions:

[0009] A plugging and filtering structure for a drainage outlet of a built slag storage drainage shaft, comprising a force-bearing structure layer, a force-transmitting layer and a filtering layer;

[0010] The force transmission layer is sandwiched between the force bearing structure layer and the anti-filter layer;

[0011] The stress-bearing structure layer is provided with a water filter port;

[0012] The anti-filtration layer includes a geotextile wrapped geomat to form an anti-filtration structure; the geotextile mat can be inserted into the drain outlet;

[0013] The force-transmitting layer is a porous sheet structure, which is used to evenly transfer the load in the drainage direction of the drain outlet to the force-bearing structure layer;

[0014] The stress-bearing structural layer, the stress-transmitting layer and the periphery of the geotextile are fixed to the inner wall of the drainage shaft or the inner wall of the drainage outlet, and the geomat is inserted into the drainage outlet to a set depth to form a plugging and anti-filtration structure.

[0015] Further, it also includes a gasket;

[0016] When the force-bearing structure layer, the force-transmitting layer and the outer periphery of the geotextile are fixed to the inner wall of the drainage shaft, the gasket is sandwiched between the outer periphery of the geotextile and the inner wall of the drainage shaft to level the inner wall of the drainage shaft;

[0017] When the load-bearing structure layer, the force-transmitting layer and the periphery of the geotextile are fixed to the inner wall of the drain outlet, the gasket is clamped between the periphery of the geotextile and the inner wall of the drain outlet to level the inner wall of the drain outlet.

[0018] Furthermore, the gasket is a rubber gasket.

[0019] Furthermore, the load-bearing structural layer, the force-transmitting layer and the periphery of the geotextile are fixed to the inner wall of the drainage shaft or the inner wall of the drainage outlet by expansion bolts.

[0020] Furthermore, when the force-bearing structural layer, the force-transmitting layer and the periphery of the geotextile are fixed to the inner wall of the drainage shaft, the expansion bolts are perpendicular to the inner wall of the drainage shaft;

[0021] When the load-bearing structure layer, the force-transmitting layer and the periphery of the geotextile are fixed to the inner wall of the drain outlet, the expansion bolts are perpendicular to the inner wall of the drain outlet.

[0022] Furthermore, the stress-bearing structural layer is a rectangular or grid-type square steel frame, and a set distance is reserved between the square steel frames to form the water filtering holes;

[0023] The force transmission layer is a stainless steel mesh.

[0024] The present invention provides a method for blocking and filtering the drainage outlet of a built slag storage drainage shaft, which adopts the following technical solutions:

[0025] A method for blocking and filtering the drain outlet of a built slag storage drainage shaft utilizes the above-mentioned blocking and filtering structure for the drain outlet of a built slag storage drainage shaft, fixes the force-bearing structure layer, the force-transfer layer and the outer periphery of the geotextile to the inner wall of the drainage shaft or the inner wall of the drain outlet, and blocks the geotextile mat at a set depth of the drain outlet to form a blocking and filtering structure.

[0026] Furthermore, when the force-bearing structure layer, the force-transmitting layer and the periphery of the geotextile are fixed to the inner wall of the drainage shaft, the width of the force-bearing structure layer is at least 10 cm larger than the hole diameter of one end of the drainage port close to the inner wall of the drainage shaft;

[0027] When the stress-bearing structure layer, the stress-transmitting layer and the periphery of the geotextile are fixed to the inner wall of the drain outlet, the distance between the stress-bearing structure layer and one end of the drain outlet close to the inner wall of the drainage shaft is more than 10 cm.

[0028] Furthermore, the load-bearing structure layer and the force-transmitting layer are subjected to anti-corrosion treatment.

[0029] Beneficial effects:

[0030] 1. The anti-filtration structure for sealing the drainage outlet of the drainage shaft of the existing slag storage has a simple structure. It only needs to be spliced ​​and installed to complete the anti-filtration sealing of the drainage outlet of the drainage shaft of the existing slag storage. The setting of geomats and geotextiles can filter and drain water to ensure that the slag storage does not allow tailings and ash to leak from the flood discharge system, and evenly transfer the load in the drainage direction of the drainage outlet to the force-bearing structure layer through the force transfer layer, so as to ensure that the structure is more stable and reliable. It solves the problem that the prefabricated concrete plug is used to seal the drainage outlet of the existing slag storage due to the non-standard hole size, which is prone to plug displacement, falling off and tearing of the outer anti-filtration structure, causing the slag body to be discharged into the drainage shaft together with the accumulated water in the storage, which damages the flood discharge system of the existing slag storage and has an adverse effect on the ecological environment. It can be widely promoted and applied in the field of anti-filtration sealing technology for the drainage outlet of harmful solid slag storage such as ash storage yards, tailings storages, and industrial waste slag.

[0031] 2. The load-bearing structure layer is a rectangular or grid-type square steel frame, and a set distance is reserved between the square steel frames to form water filtration holes; the force-transmitting layer is a stainless steel mesh, and the geotextile is fixed to the well wall using the square steel on the periphery of the square steel frame and expansion bolts. The stainless steel mesh can evenly transfer the load in the drainage direction of the drain outlet to the square steel frame, and the force transmission effect is good.

[0032] 3. The thickness of the gasket can be adjusted to achieve leveling, ensuring that the load-bearing structure layer fits well with the well wall and improving reliability.

[0033] 4. The gasket is designed as a rubber gasket. The rubber material has good elasticity, which means that it can deform when subjected to external force and return to its original shape after the external force is removed. This elasticity enables the rubber gasket to adapt to the irregular surface of the well wall and fill in the possible tiny gaps, thereby ensuring a tight fit between the plugging structure and the well wall. Elasticity also helps maintain the sealing of the plugging structure. In the case of temperature changes, pressure fluctuations or slight movement of the structure, the rubber gasket can compensate for these changes through its own elastic deformation, maintain the sealing of the plugging structure, and prevent the penetration of moisture and contaminants.

[0034] 5. When the stress-bearing structure layer, the force-transfer layer and the periphery of the geotextile are fixed to the inner wall of the drainage shaft, the width of the stress-bearing structure layer is at least 10 cm larger than the hole diameter of the drainage outlet near the inner wall of the drainage shaft; when the stress-bearing structure layer, the force-transfer layer and the periphery of the geotextile are fixed to the inner wall of the drainage outlet, the distance between the stress-bearing structure layer and the drainage outlet near the inner wall of the drainage shaft is more than 10 cm. This design ensures that the steel bars of the drainage shaft structure will not be damaged when the expansion bolts are used for fixing and installation, thus ensuring the integrity of the drainage outlet structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is the structural diagram of the precast concrete plug for the drainage shaft;

[0036] Figure 2 It is the elevation structure diagram of the drainage shaft;

[0037] Figure 3 yes Figure 2 The horizontal section of the middle drainage shaft along the A-A line;

[0038] Figure 4 It is a schematic diagram of a blocking and reverse filtering structure of a drainage outlet of a drainage shaft of a built slag storage provided by the present invention;

[0039] Figure 5 It is a longitudinal section view of a blocking and filtering structure for a drainage shaft drainage outlet of a built slag storage provided by the present invention;

[0040] Figure 6 yes Figure 5 The enlarged schematic diagram of point B in the middle;

[0041] Among them, 1-drainage shaft; 2-shaft wall; 3-drainage outlet; 4-flood drainage horizontal pipe; 5-square steel frame; 6-expansion bolts; 7-water filter outlet; 8-geotextile mat; 9-stainless steel mesh; 10-geotextile; 11-gasket. DETAILED DESCRIPTION

[0042] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0043] Embodiment 1:

[0044] Reference Figure 1 to Figure 6 This embodiment provides a plugging and filtering structure for a drainage shaft 1 and a drainage outlet 3 of a built slag storage, including a force-bearing structure layer, a force-transmitting layer and a filtering layer, wherein:

[0045] The force-transfer layer is sandwiched between the force-bearing structure layer and the filter layer; the force-bearing structure layer is provided with a water filter port 7; the filter layer includes a geotextile 10 wrapped with a geomat 8 to form a filter structure; the geotextile 8 can be inserted into the drain port 3; the force-transfer layer is a porous sheet structure, which is used to evenly transfer the load in the drainage direction of the drain port 3 to the force-bearing structure layer; the force-bearing structure layer, the force-transfer layer and the outer periphery of the geotextile 10 are fixed to the inner wall of the drainage shaft 1 or the inner wall of the drain port 3 (the accompanying drawings only show the situation where the force-bearing structure layer, the force-transfer layer and the outer periphery of the geotextile 10 are fixed to the inner wall of the drainage shaft 1), and the geotextile 8 is inserted into the drain port 3 to a set depth to form a plugging filter structure.

[0046] In this way, the anti-filtration structure of the drainage outlet 3 of the drainage shaft 1 of the built slag depot is simple, and the anti-filtration sealing of the drainage outlet 3 of the drainage shaft 1 of the built slag depot only needs to be spliced ​​and installed. The arrangement of the geomat 8 and the geotextile 10 can filter and drain water, ensuring that the slag depot does not allow tailings and ash to leak from the flood discharge system, and evenly transfers the load in the drainage direction of the drainage outlet 3 to the force-bearing structure layer 5 through the force transfer layer, ensuring that the structure is more stable and reliable, and solving the problem that the prefabricated concrete plug is used to seal the drainage outlet 3 of the built slag depot due to the non-standard hole size, which is prone to plug displacement, falling off and tearing of the outer anti-filtration structure, causing the slag body to be discharged into the drainage shaft together with the accumulated water in the depot, damaging the flood discharge system of the built slag depot and causing adverse effects on the ecological environment. It can be widely promoted and applied in the field of anti-filtration sealing technology of the drainage outlet 3 of harmful solid slag depots such as ash storage yards, tailings ponds, and industrial waste slag.

[0047] As an improvement, a gasket 11 is also provided. When the stress-bearing structure layer, the force-transfer layer and the periphery of the geotextile are fixed to the inner wall of the drainage shaft 1, the gasket 11 is provided between the periphery of the geotextile 10 and the inner wall of the drainage shaft 1, and is used to level the inner wall of the drainage shaft; when the stress-bearing structure layer, the force-transfer layer and the periphery of the geotextile are fixed to the inner wall of the drain outlet, the gasket is clamped between the periphery of the geotextile and the inner wall of the drain outlet, and is used to level the inner wall of the drain outlet 3. Leveling can be performed by adjusting the thickness of the gasket 11 to ensure that the stress-bearing structure layer fits well with the inner wall of the drainage shaft 1 or the inner wall of the drain outlet 3, and to avoid the existence of a gap between the stress-bearing structure layer and the well wall 2 (the inner wall of the drainage shaft 1 and the inner wall of the drain outlet 3 are both components of the well wall 2) to cause the anti-filtration structure to fail, thereby improving reliability. In particular, the gasket 11 can be designed as a rubber material, which has good elasticity, which means that it can be deformed when subjected to external force and return to its original shape after the external force is removed. This elasticity enables the rubber gasket 11 to adapt to the irregular surfaces of the inner wall of the drainage shaft 1 and the inner wall of the drain outlet 3, filling any small gaps that may exist, thereby ensuring a tight fit between the sealing structure and the shaft wall 2. Elasticity also helps to maintain the sealing of the sealing structure. In the event of temperature changes, pressure fluctuations or slight movement of the structure, the rubber gasket 11 can compensate for these changes through its own elastic deformation, maintain the sealing of the sealing structure, and prevent the penetration of moisture and pollutants.

[0048] As an example, the force-bearing structure layer, the force-transmitting layer, the outer periphery of the geotextile 10, and the gasket 11 are fixed to the inner wall of the drainage shaft 1 or the inner wall of the drainage port 3 by expansion bolts 6. Specifically, in this embodiment, the force-bearing structure layer is a rectangular or grid-type square steel skeleton 5, and a set distance is reserved between the square steel skeletons 5 to form a water filter hole; the force-transmitting layer is a stainless steel mesh 9. The load in the drainage direction of the drainage port 3 is evenly transferred to the square steel skeleton 5 through the stainless steel mesh 9, and the square steel skeleton 5 is subjected to force as a whole. According to the actual acidity, alkali and corrosiveness of the wastewater in the slag storage, the square steel skeleton 5, the expansion bolts 6, and the stainless steel mesh 9 are considered to take appropriate anti-corrosion measures to ensure the durability of the overall structure. In particular, in this embodiment, when the load-bearing structural layer, the force-transmitting layer and the outer periphery of the geotextile are fixed to the inner wall of the drainage shaft 1, the expansion bolts are perpendicular to the inner wall of the drainage shaft 1, and the expansion bolts mainly play a tensile role at this time; when the load-bearing structural layer, the force-transmitting layer and the outer periphery of the geotextile 10 are fixed to the inner wall of the drain outlet 3, the expansion bolts are perpendicular to the inner wall of the drain outlet 3, and the expansion bolts mainly play a shear role at this time. The expansion bolts have good shear resistance, making the fixed installation structure stable and reliable.

[0049] As an example, the inner diameter of the drainage shaft 1 is 6 to 12 m, the wall thickness of the shaft wall 2 is 0.6 to 1.6 m, and drainage outlets 3 are circumferentially arranged on the shaft wall 2 at a vertical distance of 0.8 to 1.2 m. The opening size of the drainage outlet 3 close to one end of the shaft wall of the drainage shaft 1 is 0.3 to 0.6 m, the distance between adjacent drainage outlets 3 is 0.4 to 0.8 m, and the opening size of the drainage outlet 3 close to one end of the shaft wall of the drainage shaft 1 is larger than the opening size of the end of the shaft wall away from the drainage shaft 1. A flood discharge pipe 4 is arranged at the bottom of the drainage shaft 1. The flood discharge pipe 4 is a circular reinforced concrete pipe. The diameter of the flood discharge pipe 4 can be determined according to the flood discharge capacity calculation. The accumulated water in the slag bin is discharged from the drainage outlet 3 to the drainage shaft 1, and then discharged through the drainage shaft 1 to the lower flood discharge pipe 4. When it is found through inspection that the built slag storage uses prefabricated concrete plugs to seal the drainage outlet 3, and the plugs are prone to displacement, falling off, and tearing of the outer filter structure due to the non-standard hole size, it is necessary to consider treating them. The sealing and filter structure can be set on the inner wall of the drainage shaft 1 or inside the drainage outlet 3.

[0050] In particular, when the stress-bearing structure layer, the force-transfer layer and the periphery of the geotextile 10 are fixed to the inner wall of the drainage shaft 1, the width of the stress-bearing structure layer is at least 10 cm larger than the aperture of the end of the drainage port 3 close to the inner wall of the drainage shaft 1; when the stress-bearing structure layer, the force-transfer layer and the periphery of the geotextile 10 are fixed to the inner wall of the drainage port 3, the stress-bearing structure layer is more than 10 cm away from the end of the drainage port 3 close to the inner wall of the drainage shaft 1. This design ensures that the steel bars of the drainage shaft structure will not be damaged when the expansion bolts are used for fixing and installation, thus ensuring the integrity of the drainage port 3 structure.

[0051] More specifically, the square steel frame 5 is welded with rectangular or grid-shaped square steels, and a certain distance is set between the square steels to form a water filter 7. The model and wall thickness of the square steel are determined according to the force calculation. The number, model, length and other parameters of the expansion bolts 6 can be determined according to the specific force conditions of the square steel frame 5 to ensure the stability of the structure. A layer of stainless steel mesh 9 is set next to the square steel frame 5, and a geotextile mat 8 wrapped with a geotextile 10 is set on the outside of the stainless steel mesh 9. The geotextile 10 and the geotextile mat 8 form an anti-filtration structure. The geotextile mat 8 can be inserted into the inside of the drain 3 for blocking. The geotextile 10 wrapped outside is slightly larger than the size of the drain 3, and the outer periphery of the square steel frame 5 and the expansion bolts 6 are used to fix the outer periphery of the geotextile 10 on the well wall 2. The setting of the geotextile mat 8 and the geotextile 10 can filter and drain water, ensure that the slag reservoir does not allow tailings and ash to leak from the flood discharge system, and evenly transfer the load in the drainage direction of the drain 3 to the square steel frame 5 through the stainless steel mesh 9. By adjusting the thickness of the rubber gasket 11, the inner wall of the drainage shaft 1 or the inner wall of the drainage port 3 is leveled to ensure that the outer peripheral square steel of the square steel frame 5 fits well with the shaft wall 2. According to the actual acidity, alkali and corrosiveness of the wastewater in the slag storage, the square steel frame 5, the expansion bolts 9 and the stainless steel mesh 9 are considered to take appropriate anti-corrosion measures to ensure the durability of the plugging and reverse filtering structure.

[0052] Embodiment 2:

[0053] On the basis of Example 1, this example provides a method for blocking and filtering the drain outlet 3 of a built slag storage drainage shaft 1, using a blocking and filtering structure for the drain outlet 3 of a built slag storage drainage shaft 1 of Example 1, the force-bearing structure layer, the force-transfer layer and the outer periphery of the geotextile 10 are fixed to the inner wall of the drainage shaft 1 or the inner wall of the drain outlet 3, and the geotextile mat 8 is blocked at a set depth of the drain outlet 3 to form a blocking and filtering structure.

[0054] In particular, when the stress-bearing structure layer, the stress-transfer layer and the periphery of the geotextile 10 are fixed to the inner wall of the drainage shaft 1, the width of the stress-bearing structure layer is at least 10 cm larger than the aperture of the end of the drainage port 3 near the inner wall of the drainage shaft 1. When the stress-bearing structure layer, the stress-transfer layer and the periphery of the geotextile 10 are fixed to the inner wall of the drainage port 3, the distance between the stress-bearing structure layer and the end of the drainage port 3 near the inner wall of the drainage shaft 1 is more than 10 cm. This design ensures that the structural steel bars of the drainage shaft 1 will not be damaged when the expansion bolts are used for fixing and installation, thereby ensuring the integrity of the drainage port 3 structure. In addition, it is best to perform anti-corrosion treatment on the stress-bearing structure layer and the stress-transfer layer.

[0055] As an example, a more specific operation procedure is provided as follows:

[0056] Step 1: According to the actual size of the drain port 3, purchase square steel according to the design model, and shape and manufacture a square steel frame 5 that meets the requirements;

[0057] Step 2: Purchase geomat 8 and geotextile 10 according to the design model, cut them, and wrap the geomat 8 with the geotextile 10;

[0058] Step 3: Process the stainless steel mesh 9 according to the design model and size requirements;

[0059] Step 4: Use a hanging basket or scaffolding to fix and install the plugging and filtering structure;

[0060] Step 5: Clean the inner wall of the drainage shaft 1 or the inner wall of the drainage port 3 in the square steel area outside the square steel frame 5, and lay the rubber gasket 11;

[0061] Step 6: Insert the geotextile mat 8 wrapped with the geotextile 10 into the drain outlet 3;

[0062] Step 7: Fix the outer periphery of the stainless steel mesh 9, the square steel skeleton 5 and the geotextile 10 to the inner wall of the drainage shaft 1 or the inner wall of the drainage outlet 3 by using expansion bolts 6.

[0063] Step 8: Perform secondary anti-corrosion treatment on the other steel skeleton 5, expansion bolts 6, and stainless steel mesh 9.

[0064] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A plugging and filtering structure for the drainage outlet of a built slag storage drainage shaft, characterized in that: It includes a stress-bearing structure layer, a stress-transmitting layer and an anti-filtration layer; The force transmission layer is sandwiched between the force bearing structure layer and the anti-filter layer; The stress-bearing structure layer is provided with a water filter port; The anti-filtration layer includes a geotextile wrapped geomat to form an anti-filtration structure; the geotextile mat can be inserted into the drain outlet; The force-transmitting layer is a porous sheet structure, which is used to evenly transfer the load in the drainage direction of the drain outlet to the force-bearing structure layer; The stress-bearing structural layer, the stress-transmitting layer and the periphery of the geotextile are fixed to the inner wall of the drainage shaft or the inner wall of the drainage outlet, and the geomat is inserted into the drainage outlet to a set depth to form a plugging and anti-filtration structure.

2. The anti-filtration structure for blocking the drainage outlet of the vertical shaft of the existing slag storage according to claim 1 is characterized in that: Also includes spacers; When the force-bearing structure layer, the force-transmitting layer and the outer periphery of the geotextile are fixed to the inner wall of the drainage shaft, the gasket is sandwiched between the outer periphery of the geotextile and the inner wall of the drainage shaft to level the inner wall of the drainage shaft; When the load-bearing structure layer, the force-transmitting layer and the periphery of the geotextile are fixed to the inner wall of the drain outlet, the gasket is clamped between the periphery of the geotextile and the inner wall of the drain outlet to level the inner wall of the drain outlet.

3. The anti-filtration structure for blocking the drainage outlet of the vertical shaft of the existing slag storage according to claim 2 is characterized in that: The gasket is a rubber gasket.

4. A plugging and filtering structure for the drainage outlet of a vertical shaft of a built slag storage according to any one of claims 1 to 3, characterized in that: The stress-bearing structural layer, the stress-transmitting layer and the periphery of the geotextile are fixed to the inner wall of the drainage shaft or the inner wall of the drainage outlet through expansion bolts.

5. The anti-filtration structure for blocking the drainage outlet of the vertical shaft of the existing slag storage according to claim 4 is characterized in that: When the force-bearing structure layer, the force-transmitting layer and the periphery of the geotextile are fixed to the inner wall of the drainage shaft, the expansion bolts are perpendicular to the inner wall of the drainage shaft; When the load-bearing structure layer, the force-transmitting layer and the periphery of the geotextile are fixed to the inner wall of the drain outlet, the expansion bolts are perpendicular to the inner wall of the drain outlet.

6. The anti-filtration structure for blocking the drainage outlet of the vertical shaft of the existing slag storage according to claim 5 is characterized in that: The stress-bearing structure layer is a rectangular or grid-shaped square steel frame, and a set distance is reserved between the square steel frames to form the water filtering holes; The force transmission layer is a stainless steel mesh.

7. A method for blocking and filtering the drainage outlet of a vertical shaft of a built slag storage, characterized in that: By using the anti-filtration structure for blocking the drainage outlet of a built slag storage drainage shaft as described in any one of claims 1 to 6, the force-bearing structural layer, the force-transfer layer and the outer periphery of the geotextile are fixed to the inner wall of the drainage shaft or the inner wall of the drainage outlet, and the geotextile mat is blocked at a set depth of the drainage outlet to form a blocking anti-filtration structure.

8. A method for blocking and filtering the drainage outlet of a vertical drainage shaft of an existing slag storage according to claim 7, characterized in that: When the stress-bearing structure layer, the stress-transmitting layer and the periphery of the geotextile are fixed to the inner wall of the drainage shaft, the width of the stress-bearing structure layer is at least 10 cm larger than the hole diameter of one end of the drainage port close to the inner wall of the drainage shaft; When the stress-bearing structure layer, the stress-transmitting layer and the periphery of the geotextile are fixed to the inner wall of the drain outlet, the distance between the stress-bearing structure layer and one end of the drain outlet close to the inner wall of the drainage shaft is more than 10 cm.

9. A method for blocking and filtering the drainage outlet of a vertical drainage shaft of an existing slag storage according to claim 7 or 8, characterized in that: Carry out anti-corrosion treatment on the load-bearing structure layer and the force-transmitting layer.

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