A construction method of a waste dump sinkhole structure

Abstract

The application relates to the technical field of hydraulic engineering, and particularly provides a spoil ground fall hole structure and a construction method, which comprises a drainage ditch, a prefabricated concrete pipe and a lead wire stone cage. The drainage ditch is arranged on the top surface of the spoil ground, the lead wire stone cage covers the entrance of the fall hole, and the prefabricated concrete pipe is vertically arranged above the lead wire stone cage. The upper end of the prefabricated concrete pipe is communicated with the bottom of the drainage ditch. The drainage ditch, the brick masonry structure, the prefabricated concrete pipe and the lead wire stone cage are arranged. The water flow of the spoil ground is guided through the drainage ditch and discharged into the prefabricated concrete pipe, so that the short-term heavy rainfall is timely discharged, and the soil erosion and landslide caused by the short-term heavy rainfall to the spoil ground are prevented. The water flow is filtered through the lead wire stone cage and discharged into the fall hole. Meanwhile, the multiple lead wire stone cages are used as the foundation of the prefabricated concrete pipe, so that the overall structure is more stable, the original hydrogeological condition is maintained as much as possible, and the ecological environment is protected.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering technology, and in particular to a structure and construction method for a waste disposal site sinkhole. Background Technology

[0002] Sinkholes are a type of karst landform, characterized by vertically extending caves that are either vertical or steeply sloping and winding. In karst regions, underground rivers often exist beneath sinkholes, connecting with groundwater and surface runoff. During the construction of water conservancy and hydropower projects, low-lying or relatively flat terrain near the reservoir sites is often selected as slag heaps for storing construction materials or excavated waste. However, areas suitable for constructing large slag heaps sometimes encounter complex geological conditions such as sinkholes. When these sites are selected for storing construction materials or stockpiling construction waste, the common challenges include the difficulty in sealing sinkholes to ensure the foundation's bearing capacity, and inconvenient drainage within the slag heap itself. Therefore, sinkholes pose a significant threat to the stability of slag heaps.

[0003] A sealing and drainage device for sinkholes at the bottom of karst depressions, disclosed in patent document CN116856512A, includes an arc-shaped cover. The arc-shaped cover has a flat bottom surface and a smooth arc-shaped upper surface. The bottom surface of the arc-shaped cover covers the opening of the sinkhole, and the smooth arc-shaped upper surface enhances the load-bearing capacity of the arc-shaped cover. Inside the arc-shaped cover are horizontal drainage pipes, vertical drainage pipes, upper drainage holes, and lower drainage holes. The sealing and drainage device also includes a permeable sinkhole filler. However, this patent still has some shortcomings: filling the sinkhole with the filler can easily damage the underground river and the original geological environment of the sinkhole. During short-term heavy rainfall, the water flow needs to pass through the sinkhole filler before entering the underground river, reducing the sinkhole's drainage capacity during short-term heavy rainfall and easily causing pipe blockage. Summary of the Invention

[0004] The technical problem to be solved by this invention is: in order to solve the problem of the difficulty in timely drainage of short-term heavy rainfall in spoil disposal sites, this invention provides a spoil disposal site drainage tunnel structure and construction method to solve the above problem.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a structure and construction method of a sinkhole for a spoil disposal site, including a drainage ditch, a precast concrete pipe and a gabion. The drainage ditch is set on the top surface of the spoil pile in the spoil disposal site, the gabion covers the entrance of the sinkhole, the precast concrete pipe is vertically set above the gabion, and the upper end of the precast concrete pipe is connected to the bottom of the drainage ditch.

[0006] Preferably, the system also includes a brick structure and a base, the base being a concrete structure and fixed at the top inlet of the precast concrete pipe, the brick structure surrounding the top inlet of the precast concrete pipe and fixed to the base, the drainage ditch being connected to the brick structure, and the sidewalls of the brick structure having openings for connecting the drainage ditch and the precast concrete pipe, the brick structure serving to enclose the inlet of the precast concrete pipe.

[0007] Preferably, the brick structure is further surrounded by a steel mesh fence, the top height of which is greater than the top height of the drainage ditch.

[0008] Preferably, a steel grating is installed at the top inlet of the precast concrete pipe, and the bottom of the precast concrete pipe is filled with filler stones.

[0009] Preferably, the drainage ditch is a rectangular concrete drainage ditch, and a concrete pad layer is provided below the drainage ditch and below the base.

[0010] Preferably, the precast concrete pipe has a circular cross-section and is provided with multiple sections.

[0011] Preferably, the precast concrete pipe is surrounded by large pieces of stone chips.

[0012] Preferably, multiple wire gabions are provided, and the multiple wire gabions are laid out in a rectangular flat arrangement.

[0013] A construction method for a spoil heap downhole structure, including the aforementioned spoil heap downhole structure, further includes the following steps:

[0014] S1. Protection of the sinkhole: Before dumping the waste, use multiple gabions laid flat to cover the entrance of the sinkhole, with a coverage area of ​​500cm×500cm and a coverage height of 100cm.

[0015] S2. Place concrete pipes. Set up vertical precast concrete pipes above the laid-out gabion, aligning the bottom of the precast concrete pipes with the entrance of the drain hole, and fill the bottom of the precast concrete pipes with filling stones.

[0016] S3. Stacking waste: Stack waste in the waste disposal site. When the height of the waste stack reaches near the top of the precast concrete pipe, stop stacking waste and install another precast concrete pipe vertically. Then continue stacking waste and repeat the above operation until the waste stacking is completed. Finally, lay a concrete cushion layer on the top surface of the waste stack and lay a rectangular drainage ditch on the concrete cushion layer.

[0017] S4. Import protection: Install steel grating at the top of the precast concrete pipe for shielding. Then, lay a concrete pad around the import of the precast concrete pipe. Install a concrete base on top of the concrete pad. Fix a brick structure on the base to enclose the import of the precast concrete pipe. Install a steel mesh fence around the brick structure.

[0018] As a preferred option, in S3, when slag is piled up within 5m around the precast concrete pipe, large stone chips are used for backfilling, and the layers are compacted in layers, with each layer being 50cm thick and having a porosity of less than 30%.

[0019] The beneficial effects of this invention are that it includes a drainage ditch, a brick structure, a precast concrete pipe, and gabions. The drainage ditch guides the water flow from the spoil heap into the precast concrete pipe, promptly draining away short-term heavy rainfall and preventing soil erosion and landslides caused by the erosion of the spoil heap. The water flow is filtered through the gabions and then discharged into a downhole. At the same time, multiple gabions are used as the foundation for the precast concrete pipe, making the overall structure more stable, preserving the original hydrogeological conditions as much as possible, and protecting the ecological environment. Attached Figure Description

[0020] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the optimal embodiment of the waste disposal site sinkhole structure and construction method of the present invention.

[0022] Attached reference numerals: 1. Drainage ditch; 2. Precast concrete pipe; 3. Reinforcing grating; 4. Brick structure; 5. Base; 6. Reinforcing mesh fence; 7. Downhole; 8. Filled with rubble; 9. Gabion; 10. Concrete foundation. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] like Figure 1 As shown, the present invention provides an embodiment of the structure and construction method of a sinkhole for a spoil heap, including a drainage ditch 1, a precast concrete pipe 2, and a gabion 9. The drainage ditch 1 is set on the top surface of the spoil heap. The drainage ditch 1 is a rectangular concrete drainage ditch. The drainage ditch 1 can collect water from the top surface of the spoil heap and the surrounding mountains. The rectangular cross-section of the drainage ditch 1 has dimensions of 120cm × 140cm (width × height) and a thickness of 20cm.

[0026] The upper end of the precast concrete pipe 2 is connected to the bottom of the drainage ditch 1. A steel bar grid 3 is also installed at the top inlet of the precast concrete pipe 2. The steel bar grid 3 adopts a square structure with a side length of 150cm. The outer frame of the steel bar grid 3 is made of Grade III steel bars with a diameter of 25mm, and the inner frame of the steel bar grid 3 is made of Grade III steel bars with a diameter of 16mm. It can completely cover the inlet of the precast concrete pipe 2. The concrete pipe steel bar grid 3 filters the water flow entering the precast concrete pipe 2 to prevent foreign objects from entering the precast concrete pipe 2 and causing blockage.

[0027] The precast concrete pipe 2 has a circular cross-section with a diameter of 120cm and a wall thickness of 12cm. The precast concrete pipe 2 is made up of multiple sections, each of which is 2m long, to facilitate the transportation and installation of the precast concrete pipe 2.

[0028] Gabions 9 are placed at the entrance of the sinkhole 7. Precast concrete pipes 2 are vertically positioned above the gabions 9. Multiple gabions 9 are arranged in a rectangular array, each measuring 100cm x 100cm x 100cm (length x width x height). A total of 25 gabions 9 are arranged in a rectangular array, covering an area of ​​500cm x 500cm (length x width). This 5x5 square array arrangement of the gabions 9 makes the gabions 9 more stable near the center. The gabions 9 act as filters for seepage, reducing pollution to the sinkhole and underground river. Laying the gabions 9 at the entrance of the sinkhole 7 also helps stabilize the foundation around the sinkhole 7. Furthermore, using the gabions 9 as the foundation for the precast concrete pipes 2 makes the overall structure more stable.

[0029] It also includes a brick structure 4 and a base 5. The base 5 is made of C25 concrete and is fixed at the top inlet of the precast concrete pipe 2. The thickness of the base 5 is 30cm. A concrete cushion layer 10 is provided below the drainage ditch 1 and below the base 5. The concrete cushion layer 10 is made of C20 concrete with a thickness of 10cm.

[0030] The brick structure 4 surrounds the top inlet of the precast concrete pipe 2 and is fixed to the base 5. The inner diameter of the brick structure 4 is 240cm × 240cm (length × width), and the thickness of the brick structure 4 is 24cm. The drainage ditch 1 is connected to the brick structure 45. The side wall of the brick structure 4 has an opening for connecting the drainage ditch 1 and the precast concrete pipe 2, so that the water in the drainage ditch 1 can flow smoothly into the precast concrete pipe 2. The brick structure 4 is used to enclose the inlet of the precast concrete pipe 2 to form a water inlet and prevent the water flow from causing erosion and corrosion at the inlet. At the same time, the brick structure 4 is used to enclose the surrounding waste to prevent waste from entering the precast concrete pipe 2.

[0031] The brick structure 4 is surrounded by a steel mesh fence 6, which is 120cm high. The top height of the steel mesh fence 6 is greater than the top height of the drainage ditch 1. The steel mesh fence 6 is supported by multiple 20mm diameter Grade III steel bars spaced 1m apart. The steel mesh fence 6 is used to shield the area around the brick structure 4 to prevent people and animals from accidentally falling into the precast concrete pipe 2.

[0032] The bottom of the precast concrete pipe 2 is filled with boulders 8 with a diameter of 20cm to 30cm. The filling height at the bottom of the precast concrete pipe 2 is 100cm. When water flows into the precast concrete pipe 2 from the drainage ditch 1, it will flow directly to the bottom of the precast concrete pipe 2, causing an impact on the bottom of the precast concrete pipe 2. The boulders 8 can slow down the downward flow of water, play a role in energy dissipation, and reduce the impact of water flow on the gabion 9 and downhole 7 at the bottom of the precast concrete pipe 2. Large stones with a diameter of 10cm to 30cm are backfilled within 5m of the outside of the precast concrete pipe 2 and compacted in layers with a thickness of 50cm and a porosity of less than 30%, which enhances the permeability of the outside of the precast concrete pipe 2 and facilitates the collection of waste and seepage water.

[0033] A construction method for a spoil heap downhole structure, including the aforementioned spoil heap downhole structure, further includes the following steps:

[0034] S1. Protection of the sinkhole 7: Before dumping the slag, use multiple gabions 9 to cover the entrance of the sinkhole 7, with a coverage area of ​​500cm×500cm and a coverage height of 100cm.

[0035] S2. Place concrete pipes. Set up vertical precast concrete pipes 2 above the laid gabion 9, and align the bottom of the precast concrete pipes 2 with the inlet of the drain hole 7. Fill the bottom of the precast concrete pipes 2 with filling stones 8.

[0036] S3. Stacking waste: Stacking waste in the waste disposal site. When the height of the waste stacking reaches near the top of the precast concrete pipe 2, stop stacking waste and install another precast concrete pipe 2 vertically. Then continue stacking waste and repeat the above operation until the waste stacking is completed. Finally, lay a concrete cushion layer 10 on the top surface of the waste stacking and lay a rectangular drainage ditch 1 on the concrete cushion layer 10.

[0037] In S3, when slag is piled up within 5m around the precast concrete pipe 2, large stone chips are used for backfilling, and the layers are compacted in layers, with each layer being 50cm thick and having a porosity of less than 30%.

[0038] S4. Import protection: A steel bar grid 3 is installed at the top inlet of the precast concrete pipe 2 for shielding. Then, a concrete pad 10 is laid around the inlet of the precast concrete pipe 2. A concrete base 5 is installed on top of the concrete pad 10. A brick structure 4 is fixed on the base 5 to enclose the inlet of the precast concrete pipe 2. A steel mesh fence 6 is installed around the brick structure 4.

[0039] After the above construction methods are used to construct the spoil heap, short-term heavy rainfall can be discharged in a timely manner, effectively reducing the risk of landslides at the spoil heap, controlling soil erosion within the spoil heap, and at the same time preserving the original hydrogeological conditions as much as possible to protect the ecological environment.

[0040] The drainage ditch on the top of the slag heap directs the water collected on the top of the slag heap into precast concrete pipes connected to gabions, and then drains the water out, effectively reducing the risk of landslides at the slag heap, controlling soil erosion within the slag heap, and at the same time preserving the original hydrogeological conditions as much as possible to protect the ecological environment.

[0041] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above are only preferred embodiments of this application. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A structure for a sinkhole of a waste disposal site, characterized by: The structure comprises a drainage ditch (1), a precast concrete pipe (2) and a lead wire stone cage (9), the drainage ditch (1) is arranged on the top surface of the waste dump, the lead wire stone cage (9) is arranged on the entrance of the sinkhole (7), the precast concrete pipe (2) is vertically arranged above the lead wire stone cage (9), and the upper end of the precast concrete pipe (2) is communicated with the bottom of the drainage ditch (1); A steel reinforcement grid (3) is arranged at the top entrance of the precast concrete pipe (2), and the inner bottom of the precast concrete pipe (2) is filled with filling block stones (8); The outer periphery of the precast concrete pipe (2) is filled with large block stones; The lead wire stone cage (9) is arranged in multiple, and the multiple lead wire stone cages (9) are arranged in a rectangular manner.

2. A structure for a spoil disposal site drop shaft according to claim 1, wherein: The structure further comprises a brick structure (4) and a base (5), the base (5) is arranged in a concrete structure and is fixed at the top entrance of the precast concrete pipe (2), the brick structure (4) surrounds the top entrance of the precast concrete pipe (2) and is fixed on the base (5), the drainage ditch (1) is connected to the brick structure (4), the sidewall of the brick structure (4) is provided with an opening for communicating the drainage ditch (1) and the precast concrete pipe (2), and the brick structure (4) is used for surrounding the entrance of the precast concrete pipe (2).

3. A structure for a spoil disposal site drop shaft according to claim 2, wherein: The periphery of the brick structure (4) is further provided with a steel mesh fence (6), and the top height of the steel mesh fence (6) is greater than the top height of the drainage ditch (1).

4. A structure for a spoil disposal site drop shaft according to claim 2, wherein: The drainage ditch (1) is a concrete drainage ditch with a rectangular cross section, and the lower portion of the drainage ditch (1) and the lower portion of the base (5) are provided with a concrete cushion layer (10).

5. A structure for a spoil disposal site drop shaft according to claim 1, wherein: The precast concrete pipe (2) has a circular cross section, and the precast concrete pipe (2) is arranged in multiple sections.

6. A construction method of a disposal site sinkhole structure, characterized by, The structure further comprises the following steps: S1, sinkhole (7) protection, before waste dumping, multiple lead wire stone cages (9) are arranged in a paving manner to cover the entrance of the sinkhole (7), the covering area is 500cm*500cm, and the covering height is 100cm; S2, placing a concrete pipe, a vertical precast concrete pipe (2) is arranged above the lead wire stone cage (9) after the paving is completed, the bottom of the precast concrete pipe (2) is aligned to the entrance of the sinkhole (7), and filling block stones (8) are filled into the bottom of the precast concrete pipe (2); S3, waste dumping, waste dumping is performed in the waste dump, when the height of the waste reaches the top of the precast concrete pipe (2), the waste dumping is stopped, another precast concrete pipe (2) is vertically arranged, then the waste dumping is continued, and the above operation is repeated until the waste dumping is completed, finally, a concrete cushion layer (10) is arranged on the top surface of the waste, and a rectangular drainage ditch (1) is arranged on the concrete cushion layer (10); S4, import protection, install reinforced grid (3) to shield the top import of precast concrete pipe (2), then lay concrete cushion (10) around the import of precast concrete pipe (2), install the base (5) of concrete structure above the concrete cushion (10), fix the brick structure (4) on the base (5) to surround the import of precast concrete pipe (2), and install the reinforced mesh fence (6) around the brick structure (4).

7. A method of constructing a spoil disposal lagoon structure according to claim 6 wherein: In S3, when the slag is stacked within 5m around the precast concrete pipe (2), large stone slag is used for backfilling, and each layer is compacted with a thickness of 50cm and a porosity of less than 30%.

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