Collapse pit ecological restoration treatment and fresh water resource storage and recycling system

Abstract

The utility model discloses a collapse pit ecological restoration treatment and fresh water resource storage recycling system which is characterized in that an excavation area used for arranging a cover plate, a filter layer and planting soil is excavated above a collapse pit, water stop reinforcing areas forming an underground water storage pond are arranged at the bottom of the excavation area, a bottom plate is arranged at the bottom of the collapse pit, and a plurality of cross beams are arranged between the water stop reinforcing areas; a water-collecting well is arranged in the underground water storage pond. The system has the advantages that the collapse pits are fully utilized to store and utilize fresh water resources and turn waste into wealth while the ecological environment of the mining area is improved, so that the ecological environment can be improved, the fresh water resource reserve is increased, and the system has great social benefits, environmental benefits, ecological benefits and economic benefits.

Description

Technical Field

[0001] The utility model relates to an ecological management and water resource utilization system, in particular to a coal mining subsidence pit repair management and fresh water resource storage and utilization technology and system. Background Art

[0002] According to data released by my country's Ministry of Natural Resources, there are more than 4.4 million mines in my country, and about 99,000 abandoned mines. The ecological and environmental problems of these abandoned mines are characterized by diverse types, complex causes, large numbers, wide distribution, and serious hazards. The main ecological and environmental problems include mining geological disasters, damage to land resources in mining areas, damage to regional groundwater systems, ground subsidence, and water and soil pollution in mining areas.

[0003] Water resources are basic natural resources and the controlling factors of the ecological environment.

[0004] At present, the treatment of coal mining subsidence areas is just to fill the subsidence pit, level it, restore the surface, etc. This method requires a lot of backfill soil, which is costly, has poor stability, and does not achieve the purpose of comprehensive utilization of the subsidence pit.

[0005] The publication number is CN114868630A, and the application name is "Integrated water and fertilizer automated maintenance system for ecological restoration of high and steep facades in mines". It discloses a mine maintenance system, which includes a greening area, a water diversion system, and a reservoir. The system is complicated and difficult to construct, and is not suitable for the repair of coal mining subsidence.

[0006] The invention patent with the publication number CN113545278A and the application name "An automated drip irrigation and maintenance method for mine ecological restoration" discloses a mine drip irrigation method, which uses a water storage device for mine ecological restoration for automatic drip irrigation and uses the above method to automatically control the water storage device during drip irrigation. It mainly solves the control of drip irrigation and does not involve the problem of repairing collapse. Summary of the invention

[0007] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a system for ecological restoration and management of collapsed pits and storage and reuse of fresh water resources.

[0008] This collapse pit ecological restoration and freshwater resource storage and reuse system has an excavation area above the collapse pit for setting a cover plate, a filter layer and planting soil. The excavation depth is the sum of the thickness of the cover plate, the filter layer and the planting layer. A water-stopping reinforcement area is set at the bottom of the excavation area to form an underground water storage tank. A bottom plate is set at the bottom of the collapse pit, a number of beams are set between the water-stopping reinforcement areas, and a water collection well is set in the underground water storage tank.

[0009] For further optimization, a water collecting pipe is arranged between the water stopping reinforcement area and the cover plate, and the water collecting pipe is embedded in the water stopping reinforcement area.

[0010] Further optimization, the cover plate is located below the filter layer, and the filter layer is located below the planting soil. Further optimization, the vertical angle between the water collection pipe and the water stop reinforcement area is 30-75°.

[0011] In a further step of optimization, the cross-section of the water collecting pipe is a semicircular hollow structure, the height of the outer port of the water collecting pipe is smaller than the height of the inner port, the upper surface of the water collecting pipe is an open rectangle, the upper surface and the water stop reinforcement area are on the same horizontal plane, the width of the upper surface is consistent on the outer side with the inner side, and the length is the horizontal distance from the outer boundary line of the water stop reinforcement area to the collapse pit.

[0012] Further optimization, the cover plate is rectangular, and the center of the cover plate is the wellhead of the water collection well.

[0013] For further optimization, a plurality of water inlets are provided at the wellhead of the water collection well and at the cover plate positions corresponding to the water collection pipe.

[0014] Further optimization, the filter layer is made of graded granular material, and the particle size increases step by step from top to bottom.

[0015] Further optimization, the planting soil is soil added with organic materials.

[0016] The advantages of the utility model are that the system not only improves the ecological environment of the mining area, but also makes full use of the collapse pit to store and utilize fresh water resources, turning waste into treasure. It can not only improve the ecological environment, but also increase the reserve of fresh water resources, and has significant social, environmental, ecological and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a cross-section of the collapse pit.

[0018] Figure 2 A top view of the excavation area.

[0019] Figure 3 This is a schematic diagram of the structure of an underground water storage tank.

[0020] Figure 4 A top view of the cover.

[0021] Figure 5 This is a cross-sectional view of the water collecting pipe.

[0022] Figure 6 This is the upper surface diagram of the water collecting pipe.

[0023] Figure 7 Schematic diagram of the water collecting pipe structure.

[0024] Figure 8This is a cross-sectional view of the water-stop reinforcement area.

[0025] Markings in the figure are: 1-ground surface, 2-excavation area, 3-collapse pit, 4-water-stop reinforcement area, 5-collecting pipe, 6-crossbeam, 7-bottom plate, 8-underground water storage tank, 9-planting soil, 10-filtration layer, 11-cover plate, 12-collecting well, 13-water inlet, 51-external port of collecting pipe, 52-inner port of collecting pipe, 53-upper surface of collecting pipe. DETAILED DESCRIPTION

[0026] A system for ecological restoration and management of a collapsed pit and storage and reuse of freshwater resources will be further described below in conjunction with the accompanying drawings.

[0027] This system for ecological restoration and management of subsidence pits and storage and reuse of fresh water resources carries out ecological restoration and management and comprehensive utilization of the coal mining subsidence pit 3 through geological surveys, mapping and measurement of the coal mining area and calculations using special software. The periphery of the subsidence pit 3 is excavated, the water-stopping reinforcement area 4 is reinforced by grouting, and a water collecting pipe 5 is set. The water collecting pipe 5 has a certain slope, which is conducive to the rapid flow of water resources into the underground water reservoir. The water-stopping reinforcement area 4 after grouting reinforcement has a certain bearing capacity and water-stopping property, which can ensure the structural stability of the subsidence pit 3 and prevent the loss of fresh water resources stored in the subsidence pit 3. The bottom of the collapse pit 3 is a cast-in-place concrete base plate 7, which is seamlessly connected to the water-stopping reinforcement area 4, and the connection is drained. A number of beams 6 are arranged in the collapse pit 3, and a concrete cover plate 11 is covered above the water-stopping reinforcement area 4. The concrete cover plate 11 is provided with a water inlet 13, which is evenly arranged at a position corresponding to the wellhead and the water collecting pipe 5, which is conducive to the rapid infiltration of surface runoff 1 of precipitation. A filter layer 10 is provided above the cover plate 11, and soil is covered, grass seeds are sown, and vegetation is planted above the filter layer 10, and isolation guardrails and warning signs are set.

[0028] This coal mining subsidence pit 3 repair and management and fresh water resource storage and utilization system first surveys and measures the abandoned mining area, uses special software to produce a land property map within the management area, and then plans and designs the land use nature after the subsidence pit 3 is repaired and managed based on the current land use map within the management area.

[0029] After the collapse pit 3 is sloped, leveled and cleaned, excavation is carried out around the wellhead of the collapse pit 3 to form the excavation area 2. The excavation area 2 is excavated from the ground surface 1 downwards. The excavation depth is the sum of the thickness of the cover plate 11, the filter layer 10, and the planting layer. The excavation size is 1m outside the wellhead diameter, and the excavation outer boundary forms a rectangle.

[0030] Below the excavation area 2 is the water-stopping reinforcement area 4. The top plan view of the water-stopping reinforcement area 4 is a rectangle, which is consistent with the outer boundary line of the excavation area 2. Five water-collecting pipes are excavated in the middle of the four directions of the water-stopping reinforcement area 4. Water-collecting pipes 5 are arranged in the water-collecting pipes 5. The excavation size of the water-collecting pipes 5 is the outer diameter size of the water-collecting pipes 5. The cross-section of the water-collecting pipes 5 is a semicircular hollow structure. The height of the outer port 51 of the water-collecting pipe is less than the height of the inner port. The water-collecting pipes 5 are inclined toward the inner side of the collapse pit 3 at a certain slope. The angle between the water-collecting pipes 5 and the vertical plane of the water-stopping reinforcement area 4 is 30-75°, so that the infiltrated water resources can quickly flow into the underground water storage tank 8. The upper surface 53 of the water-collecting pipe is an unclosed rectangle. The upper surface and the water injection reinforcement area are on the same horizontal plane. The outer side of the upper surface width is consistent with the inner side, and the length is the horizontal distance from the outer boundary line of the water-stopping reinforcement area 4 to the collapse pit 3. The water-collecting pipe 5 is made of PVC pipe or steel pipe.

[0031] After the excavation of the water collecting pipe 5, the original soil at the bottom of the collapse pit 3 is compacted, and cement slurry is prepared at the same time. A hole is drilled into the water stopping reinforcement area 4 and a grouting pipe is inserted. The quick-setting cement slurry is pressurized into the water stopping reinforcement area 4 through the grouting pipe. After the grouting is completed, the slurry solidifies to form a grouting reinforcement body. The water stopping reinforcement area 4 has a certain bearing capacity and water stopping property. Concrete is sprayed on the inner surface of the water stopping reinforcement area 4 to play a role of anti-seepage and reinforcement.

[0032] After the bottom of the collapse pit 3 is compacted, a concrete bottom plate 7 is cast in place. The thickness of the bottom plate 7 is determined according to the height of the collapse pit 3. The bottom plate 7 is seamlessly connected to the water-stopping reinforcement area 4, and the connection is waterproofed. The water-stopping reinforcement area 4 and the bottom plate 7 form a closed underground water storage tank 8. A water collection well 12 is provided in the underground water storage tank 8. The wall of the water collection well 12 is provided with water-permeable holes and the outer periphery is wrapped with a filter layer 10, which plays a role in filtering impurities. In this way, the fresh water resources stored in the underground water storage tank 8 can be pumped out through the water collection well 12 to achieve the reuse of fresh water resources.

[0033] In order to prevent the water-stop reinforcement area 4 from collapsing due to soil pressure and to ensure the structural stability of the underground water tank 8, a number of beams 6 are arranged in the underground water tank 8. The beams 6 are connected to the relative water-stop reinforcement area 4. The beams 6 are cast-in-place reinforced concrete structures. The cross-sectional size and number are determined according to the specific soil pressure. The ends of the beams 6 are embedded in the water-stop reinforcement area 4, which can effectively ensure the supporting performance of the beams 6.

[0034] A reinforced concrete cover plate 11 is placed above the excavation area 2, i.e., the water-stop reinforcement area 4. The thickness of the cover plate 11 is determined by the ground bearing capacity. The cover plate 11 is a reinforced concrete plate cast on site. The reinforced concrete plate is designed according to the specific load. The thickness of the concrete protective layer is not less than 30 mm. The reinforced concrete cover plate 11 can withstand a certain load and play a role in heat preservation to prevent water freezing in the underground water storage tank 8 in some cold areas in winter.

[0035] The cover plate 11 is rectangular, and its size is consistent with that of the water-stop reinforcement area 4. The center of the cover plate 11 is the outlet of the water collection well 12. A plurality of water inlets 13 are arranged at the positions of the cover plate 11 corresponding to the wellhead and the water collection pipe 5, so as to promote the surface 1 runoff and precipitation to be collected into the water collection pipe 5 and the underground water storage tank 8 through the water inlets 13. The water inlets 13 penetrate the cover plate 11, and a filter is arranged at the water inlets 13 to prevent impurities from entering the underground water storage tank 8. The water inlets 13 can quickly promote the rapid infiltration of the surface 1 runoff;

[0036] Above the cover plate 11 is the filter layer 10. The thickness of the filter layer 10 is determined according to the needs. The filter layer 10 is graded granular material. The particle size increases from top to bottom. It plays a filtering role on the infiltrating water flow to prevent impurities from clogging the filter sheet in the water inlet 13 and affecting the infiltration rate of water. Above the filter layer 10 is the covering planting soil 9. The planting soil 9 is soil with added organic materials. The added organic material is straw. The added content is 0.25kg / ㎡, ensuring that its organic matter content is 35g·kg -1 As shown above, the elevation after covering is consistent with the surrounding ground elevation.

[0037] According to the nature and scope of land use in the land use status map, the original surface landforms are restored, and agriculture is carried out where it is suitable for agriculture, and forestry is carried out where it is suitable for forestry. The freshwater resources in the underground water storage tanks are used for irrigation and water replenishment as needed to ensure the freshwater supply of vegetation and crops in the management area. This not only eliminates the mining geological environment and geological disasters in the region, but also improves the survival rate and growth status of vegetation and crops, increases the crop yield in the region, improves the ecological environment and microclimate environment, increases freshwater resources, and realizes the restoration, management and comprehensive utilization of coal mining subsidence pits.

[0038] The above shows and describes the basic principles, main structures and advantages of the present invention. It should be understood by those skilled in the art that the present invention may be modified and improved in size and direction without departing from the spirit and scope of the present invention, and these modifications and improvements fall within the scope of the present invention.

Claims

1. A system for ecological restoration and management of collapsed pits and storage and reuse of freshwater resources, characterized in that: An excavation area for setting a cover plate, a filter layer and planting soil is dug above the collapse pit. A water-stopping reinforcement area is set at the bottom of the excavation area to form an underground water storage tank. A bottom plate is set at the bottom of the collapse pit, a number of beams are set between the water-stopping reinforcement areas, and a water collection well is set in the underground water storage tank.

2. The system for ecological restoration and management of collapsed pits and storage and reuse of freshwater resources according to claim 1 is characterized by: A water collecting pipe is arranged between the water stopping reinforcement area and the cover plate, and the water collecting pipe is embedded in the water stopping reinforcement area.

3. The system for ecological restoration and management of collapsed pits and storage and reuse of freshwater resources according to claim 1 is characterized by: The cover plate is located below the filter layer, and the filter layer is located below the planting soil.

4. The system for ecological restoration and management of collapsed pits and storage and reuse of freshwater resources according to claim 2 is characterized by: The included angle between the water collecting pipe and the vertical plane of the water stopping reinforcement area is 30-75°.

5. The system for ecological restoration and management of collapsed pits and storage and reuse of freshwater resources according to claim 2 is characterized by: The cross-section of the water collecting pipe is a semicircular hollow structure, the height of the outer port of the water collecting pipe is smaller than the height of the inner port, the upper surface of the water collecting pipe is an open rectangle, the upper surface and the water stop reinforcement area are on the same horizontal plane, the outer side of the upper surface width is consistent with the inner side, and the length is the horizontal distance from the outer boundary line of the water stop reinforcement area to the collapse pit.

6. The system for ecological restoration and management of collapsed pits and storage and reuse of freshwater resources according to claim 1 is characterized by: The cover plate is rectangular, and the center of the cover plate is the wellhead of the water collection well.

7. The system for ecological restoration and management of collapsed pits and storage and reuse of freshwater resources according to claim 6 is characterized by: A plurality of water inlets are arranged on the wellhead of the water collecting well and the cover plate positions corresponding to the water collecting pipe.

8. The system for ecological restoration and management of collapsed pits and storage and reuse of freshwater resources according to claim 1 is characterized by: The filter layer is made of graded granular material, and the particle size increases gradually from top to bottom.

9. The system for ecological restoration and management of collapsed pits and storage and reuse of freshwater resources according to claim 1, characterized in that: The planting soil is soil with organic materials added.

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