Multi-stage prefabricated ecological drainage system and construction method in reclamation area

Abstract

The present invention relates to a construction method for a multi-stage prefabricated ecological drainage system in a reclamation area, comprising the following steps: fabricating a base and annular precast blocks, and installing pre-embedded threaded sleeves and lifting rings within the base and annular precast blocks; installing the base and drainage pipes at a lower elevation in the reclamation area, and backfilling and compacting the soil; stacking the annular precast blocks layer by layer on the base and fixing them with connecting bolts, and wrapping the annular precast blocks with geotextile; selecting appropriate-sized primary, secondary, and tertiary filter baskets to assemble a multi-stage filter basket filtration system, and suspending the multi-stage filter baskets on the top annular precast block, and fitting vertical filter cylinders around the annular precast blocks; conveying slurry to the reclamation area to begin reclamation operations; promptly cleaning the silt and sand within the multi-stage filter baskets and adding annular precast blocks during reclamation; after reclamation is completed, lifting the annular precast blocks and base layer by layer from the sedimentary soil layer; and backfilling the pits left by the base and annular precast blocks in the sedimentary soil layer by layer with backfill soil.

Description

Technical Field

[0001] This invention relates to the construction of drainage systems in river dredging and reclamation areas, and more particularly to a construction method for a multi-stage prefabricated ecological drainage system in reclamation areas. Background Technology

[0002] To enable the reuse of dredged soil, dredging and reclamation projects are often combined. This approach deepens waterways and raises land levels, achieving a dual benefit through comprehensive utilization. It is widely used in river and lake management, port and waterway dredging, and land reclamation, and is a crucial means of promoting sustainable socio-economic and ecological development. In dredging and reclamation construction, the drainage system is a key component ensuring the safe and efficient operation of the reclamation area. Although the drainage system is only a temporary auxiliary facility controlling tailwater discharge in reclamation projects, it plays a direct regulatory role in improving sediment settling in the reclamation area and reducing mud pollution to the environment.

[0003] Existing drainage outlet types mainly include buried pipe type, overflow weir type, and vertical shaft type. Buried pipe type has a simple structure and low cost, but its applicability is limited. Overflow weir type has a simple structure, is safe and durable, and facilitates the deposition of dredged mud, reducing mud pollution; however, the drainage outlet blocks traffic above the weir, and daily maintenance is extensive. Vertical shaft type drainage outlet is a new type that combines the advantages of buried pipe and overflow weir types. By adding a gate, the water level in the dredged reclamation area can be freely raised; however, vertical shaft type drainage outlets are difficult to dismantle, hindering reclamation operations in the dredged reclamation area. As the sedimentary soil layer in the dredged reclamation area rises, the drainage outlet is deeply buried within the sedimentary soil layer. After construction, the drainage outlet can only be left in the sedimentary soil layer, or the surrounding soil layer must be excavated using excavating machinery before dismantling, resulting in extremely difficult and labor-intensive work. Summary of the Invention

[0004] The purpose of this invention is to address the challenges in constructing drainage systems for dredged and reclaimed river areas by proposing a multi-stage prefabricated ecological drainage system and its construction method. To achieve this purpose, the technical solution of this invention is as follows:

[0005] This invention relates to a multi-stage prefabricated ecological drainage system for reclamation areas, comprising a base, annular precast blocks, connecting screws, vertical filter cylinders, multi-stage filter baskets, and drainage pipes. The base is an inverted cone-shaped concrete structure, wider at the top and narrower at the bottom, with drainage outlets on the sides. The annular precast blocks are integrally cast using permeable concrete. These blocks are divided into cylindrical precast blocks and open-faced precast blocks, with multiple open-faced precast blocks stacked layer by layer on the base. The diameter of the open-faced precast blocks gradually increases from bottom to top, forming an inverted cone shape. After construction, this facilitates the removal and lifting of the annular precast blocks layer by layer from the sedimentary soil layer for backfilling, which is beneficial for reclamation operations in the reclamation area and is environmentally friendly. The cylindrical precast blocks are stacked layer by layer on top of the open-faced precast blocks, with the diameter of the cylindrical precast blocks equal to the diameter of the top cross-section of the open-faced precast blocks. Both the base and the annular precast block have pre-embedded threaded sleeves. The connecting bolt passes through the pre-embedded threaded sleeve in the upper annular precast block and is anchored in the pre-embedded threaded sleeve in the lower annular precast block or the base. The multi-stage filter basket consists of a primary filter basket, a secondary filter basket, and a tertiary filter basket. Each of the primary, secondary, and tertiary filter baskets consists of an annular wing plate, an annular base plate, side filter screens, a base plate filter screen, and a connecting sleeve. The primary, secondary, and tertiary filter baskets are connected in series using fixing bolts to form a multi-stage filter system. The multi-stage filter basket is suspended on the top annular precast block, and the vertical filter cylinder is vertically fitted onto the outside of the annular precast block. One end of the drain pipe is inserted into the drain outlet of the base, and the other end of the drain pipe passes through the bottom of the cofferdam and extends into the stilling basin to reduce the impact force of the water flow before being discharged through the drainage channel.

[0006] Preferably, there are four pre-embedded threaded sleeves in the base and the annular precast block. The four pre-embedded threaded sleeves are evenly arranged circumferentially, and the pre-embedded threaded sleeves of the upper and lower layers are aligned with each other. Each annular precast block is anchored to the base or annular precast block of the lower layer using two connecting screws. The connecting screws in the lower annular precast block and the connecting screws in the upper annular precast block are staggered to avoid mutual interference between the connecting screws of the upper and lower layers, while realizing the connection and fixation between the upper and lower annular precast blocks.

[0007] Preferably, a swivel joint is added between the open precast block and the cylindrical precast block. The swivel joint consists of a threaded rod and a threaded sleeve. The threaded sleeve is connected to the threaded rod via a pin. The threaded rod of the swivel joint is anchored to the pre-embedded threaded sleeve in the open precast block. The connecting screw in the upper cylindrical precast block of the open precast block is anchored to the threaded sleeve of the swivel joint. Since the pre-embedded threaded sleeves in the open precast block and the cylindrical precast block are not on the same axis, a swivel joint is added to the open precast block. The threaded sleeve of the swivel joint can rotate relative to the threaded rod. The threaded rod of the swivel joint and the pre-embedded threaded sleeve in the open precast block are on the same axis. By adjusting the threaded sleeve of the swivel joint to be on the same axis as the pre-embedded threaded sleeve in the cylindrical precast block, the swivel joint can accommodate the situation where the axes of the pre-embedded threaded sleeves in the open precast block and the cylindrical precast block deflect, thereby achieving the connection and anchoring between adjacent open precast blocks and cylindrical precast blocks.

[0008] Preferably, the base and the annular precast block are provided with lifting rings, and the lifting rings have recesses. The lifting rings are flush with the upper surface of the base or the annular precast block, so that the lifting rings are hidden in the recesses, so as to avoid affecting the stacking of the upper annular precast blocks and not affect the hoisting of the annular precast blocks.

[0009] Preferably, the annular wing plate and the annular base plate are fixed to the upper and lower edges of the side filter screen, respectively. The edge of the base plate filter screen is fixed to the annular base plate. The lower end of the connecting sleeve passes through the center of the base plate filter screen and is fixed to the base plate filter screen. The primary, secondary, and tertiary filter baskets have various diameter specifications. The primary, secondary, and tertiary filter baskets of different diameter specifications are reasonably selected according to the diameter of the annular precast block to form a multi-stage filter basket filtration system. The outer diameter of the annular wing plate of the primary filter basket is slightly larger than the inner diameter of the top annular precast block, ensuring that the primary filter basket can be erected and suspended on the top annular precast block through the annular wing plate. The installation of the multi-stage filter basket by suspension reduces the installation difficulty of the multi-stage filter basket and facilitates the removal of the multi-stage filter basket filtration system for raising the annular precast block and cleaning the mud and sand in the multi-stage filter basket.

[0010] Preferably, the aperture of the vertical filter cartridge is greater than that of the primary filter basket, which is greater than that of the secondary filter basket, which is greater than that of the tertiary filter basket. The vertical filter cartridge forms the first filtration barrier on the outside of the annular precast block, which has a good effect on reducing water flow velocity and improving sediment sedimentation. The multi-stage filter basket forms the second multi-stage filtration barrier, which filters the sediment flowing into the drainage system in multiple stages, preventing sediment from entering the water outside the reclamation area with the water flow and reducing the pollution of the water environment caused by reclamation operations.

[0011] Preferably, the base and drainage pipe are set within the original ground surface of the reclamation area, with the top surface of the base flush with the original ground surface. This ensures that water in the sedimentary soil layer can flow into the base and drain through the permeable concrete ring-shaped precast blocks, which can significantly shorten the consolidation and stabilization cycle of the sedimentary soil layer in the reclamation area. A compacted base layer is provided below the base and drainage pipe, and a backfilled sand and gravel layer is provided around it. A compacted clay layer is covered on top of the backfilled sand and gravel layer. Through layered backfilling and compaction, uneven settlement of the base is avoided, and water in the sedimentary soil layer is also prevented from seeping into the soil below the original ground surface.

[0012] Preferably, the construction method for a multi-stage prefabricated ecological drainage system in a reclamation area includes the following construction steps:

[0013] Step 1. Fabricate the base and the annular precast block, and install pre-embedded threaded sleeves and lifting rings in the base and the annular precast block. The base is integrally cast with concrete, and the annular precast block is integrally cast with permeable concrete.

[0014] Step 2. Install the base and drainage pipes at the lower-lying areas of the reclamation area. Excavate trenches downwards from the original ground surface. Set up a compacted base layer at the bottom of the trench. Install the base and drainage pipes in the trench and set up a backfill layer of sand and gravel in the trench. Cover the backfill layer of sand and gravel with a compacted clay layer. Then construct a cofferdam along the edge of the reclamation area. Through layered backfilling and compaction, uneven settlement of the base is avoided, and water in the sediment layer is prevented from seeping into the soil below the original ground surface.

[0015] Step 3. Stack the annular precast blocks layer by layer on the base. Multiple open precast blocks are stacked on the base layer by layer. The diameter of the open precast blocks gradually increases from bottom to top, forming an inverted cone shape. After construction, it is convenient to remove the annular precast blocks from the sedimentary soil layer layer by layer and lift them out before backfilling. This is beneficial for reclamation operations in the reclamation area and is environmentally friendly. Use connecting bolts to fix the annular precast blocks. The connecting bolts pass through the pre-embedded threaded sleeves in the upper annular precast blocks and are anchored in the pre-embedded threaded sleeves in the lower annular precast blocks or the base. After the annular precast blocks are installed in place, wrap a layer of geotextile on the outside of the annular precast blocks to prevent mud and sand from entering the interior of the annular precast blocks and blocking the drainage channels, which would affect the drainage of water in the sedimentary soil layer.

[0016] Step 4. Select appropriate-sized primary, secondary, and tertiary filter baskets and assemble them into a multi-stage filter basket filtration system. Hang the multi-stage filter baskets on the top ring precast block and fit the vertical filter cartridges around the outside of the ring precast block.

[0017] Step 5. Begin the dredging operation by supplying slurry to the reclamation area, and keep the outlet of the slurry delivery pipeline away from the drainage system of the annular precast block assembly to prevent the slurry from flowing directly into the drainage system.

[0018] Step 6. During the reclamation operation, promptly clean the silt filtered in the multi-stage filter baskets, and add annular precast blocks as the sediment layer and water level rise. Anchor the added annular precast blocks to the lower annular precast blocks according to the method described in Step 3.

[0019] Step 7. After the dredging operation is completed and the sedimentary soil layer has consolidated to the design requirements, remove the drainage system, dismantle the connecting bolts layer by layer, and lift the annular precast block and base out of the sedimentary soil layer.

[0020] Step 8. Use backfill soil to backfill and compact the pits left by the base and the ring precast blocks in the sedimentary soil layer layer by layer.

[0021] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0022] 1. The drainage outlet is made of stacked ring-shaped precast blocks, which is convenient and quick to install. During construction, the number of ring-shaped precast blocks can be flexibly increased according to the height of the sedimentary soil layer in the reclamation area, making it widely applicable.

[0023] 2. A vertical filter cylinder and multi-stage filter basket filtration system are installed around the annular precast blocks to intercept sediment, reducing soil erosion and mud pollution.

[0024] 3. The ring-shaped precast blocks are integrally cast using permeable concrete, which can achieve better drainage and mud-blocking effects and accelerate the consolidation of the sedimentary soil layer in the reclamation area.

[0025] 4. The stacked ring-shaped precast blocks are inverted cone shape. After construction, it is convenient to lift the ring-shaped precast blocks out of the sedimentary soil layer one by one, and then backfill them. This is conducive to carrying out reclamation operations in the reclamation area and is environmentally friendly.

[0026] 5. After simple rinsing, the dismantled ring-shaped precast blocks can be reused, reducing material waste and making them environmentally friendly; they also have high structural reliability and strong engineering applicability. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a ring-shaped precast block structure;

[0028] Figure 2 This is a half-section view of the three-dimensional structure of the ring-shaped precast block;

[0029] Figure 3 This is a schematic diagram of a trapezoidal precast block structure;

[0030] Figure 4 This is a half-section view of the three-dimensional structure of the trapezoidal precast block;

[0031] Figure 5 This is a schematic diagram of the concrete base structure;

[0032] Figure 6 This is a half-section view of the three-dimensional structure of the concrete base;

[0033] Figure 7 This is a schematic diagram of the precast block assembly structure;

[0034] Figure 8 This is a schematic diagram of the bolt arrangement for precast block assembly;

[0035] Figure 9 This is a schematic diagram of the assembly structure of annular precast blocks and trapezoidal precast blocks;

[0036] Figure 10 This is a schematic diagram of the installation structure of the steering joint. Figure 7 (Node A in the middle)

[0037] Figure 11 This is a schematic diagram of the steering joint structure;

[0038] Figure 12 This is a three-dimensional structural diagram of the steering joint;

[0039] Figure 13 This is a schematic diagram of a multi-stage filter basket structure;

[0040] Figure 14 This is a half-section view of the three-dimensional structure of a multi-stage filter basket;

[0041] Figure 15 This is a schematic diagram of the working structure of a multi-stage filter basket;

[0042] Figure 16 This is a schematic diagram of the working structure of a multi-stage prefabricated drainage system;

[0043] Figure 17 This is a schematic diagram of the dismantling and backfilling structure of a multi-stage prefabricated drainage system.

[0044] The diagram is labeled as follows: 1-base, 11-drainage outlet, 2-ring precast block, 21-straight precast block, 22-open precast block, 23-geotextile, 31-embedded threaded sleeve, 32-lifting ring, 33-connecting screw, 34-rotating joint, 341-threaded rod, 342-threaded sleeve, 343-pin, 41-vertical filter cartridge, 42-multi-stage filter basket, 421-first-stage filter basket, 422-second-stage filter basket 423-Three-stage filter basket, 424-Annular wing plate, 425-Annular base plate, 426-Side filter screen, 427-Base plate filter screen, 428-Connecting sleeve, 429-Fixing bolt, 51-Original ground, 52-Compacted base layer, 53-Backfill sand and gravel layer, 54-Compacted clay layer, 55-Sedimentary soil layer, 56-Backfill soil, 61-Cofferdam, 62-Drainage pipe, 63-Energy stilling basin, 64-Drainage ditch. Detailed Implementation

[0045] To enhance understanding of the present invention, reference will be made below to the appendix. Figure 1 To be continued Figure 17 The embodiments of the present invention will be described in detail below. The following embodiments are implemented based on the technical solution of the present invention and provide detailed implementation methods. However, the protection scope of the present invention is not limited to the following embodiments.

[0046] This invention relates to a construction method for a multi-stage prefabricated ecological drainage system in a reclamation area, comprising the following steps:

[0047] Step 1. As attached Figure 1 To be continued Figure 6 As shown, a base 1 and annular precast blocks 2 are fabricated, and pre-embedded threaded sleeves 31 and lifting rings 32 are installed in the base 1 and annular precast blocks 2. The lifting rings 32 are flush with the upper surface of the base 1 or annular precast blocks 2. The lifting rings 32 have recesses. By hiding the lifting rings 32 in the recesses, the stacking of the upper annular precast blocks 2 is avoided, and the hoisting of the annular precast blocks 2 is not affected. There are four pre-embedded threaded sleeves 31 in the base 1 and annular precast blocks 2. The four pre-embedded threaded sleeves 31 are evenly arranged circumferentially, and the pre-embedded threaded sleeves 31 of the upper and lower layers are aligned with each other. The base 1 is integrally cast with concrete and has an inverted cone-shaped structure that is larger at the top and smaller at the bottom. Drainage outlets 11 are provided on the side. The annular precast blocks 2 are integrally cast with permeable concrete. The annular precast blocks 2 are divided into open precast blocks 22 and straight precast blocks 21. The open precast blocks 22 and straight precast blocks 21 have various diameter specifications.

[0048] Step 2. As attached Figure 16 As shown, a base 1 and drainage pipe 62 are installed at a lower elevation in the reclamation area. A trench is excavated downwards from the original ground 51, and a compacted base layer 52 is set at the bottom of the trench. The base 1 and drainage pipe 62 are installed in the trench, and a backfill layer 53 of sand and gravel is set in the trench. A compacted clay layer 54 is then covered on top of the backfill layer 53. A cofferdam 61 is then constructed along the edge of the reclamation area. Through layered backfilling and compaction, uneven settlement of the base 1 is prevented, and water in the sediment layer 55 is prevented from seeping into the soil below the original ground 51. The base 1 and drainage pipe 62 are installed at a lower elevation in the reclamation area. Water pipe 62 is installed in the original ground 51 of the reclamation area. The top surface of the base 1 is flush with the original ground 51, ensuring that water in the sediment layer 55 can flow into the base 1 through the permeable concrete ring precast block 2 and be discharged. This can significantly shorten the consolidation and stabilization cycle of the sediment layer 55 in the reclamation area. One end of the drainage pipe 62 is inserted into the drainage outlet 11 of the base 1, and the other end of the drainage pipe 62 passes through the bottom of the cofferdam 61. The other end of the drainage pipe 62 extends into the stilling basin 63 to reduce the impact force of the water flow before being discharged through the drainage channel 64.

[0049] Step 3. As attached Figure 7 Appendix Figure 16As shown, annular precast blocks 2 are stacked layer by layer on the base 1. Multiple open precast blocks 22 are stacked layer by layer on the base 1. The diameter of the open precast blocks 22 gradually increases from bottom to top, forming an inverted cone shape. After construction, it is convenient to remove and lift the annular precast blocks 2 from the sedimentary soil layer 55 layer by layer, and then backfill, which is beneficial for reclamation operations in the reclamation area and is environmentally friendly. The annular precast blocks 2 are fixed with connecting bolts 33. The connecting bolts 33 pass through the pre-embedded threaded sleeves 31 in the upper annular precast blocks 2 and are anchored in the pre-embedded threaded sleeves 31 in the lower annular precast blocks 2 or the base 1. After the annular precast blocks 2 are installed in place, a layer of geotextile 23 is wrapped around the outside of the annular precast blocks 2 to prevent mud and sand from entering the interior of the annular precast blocks 2 and blocking the drainage channels, thus affecting the drainage of water in the sedimentary soil layer 55. As shown in the attached figure. Figure 8 As shown, each layer of annular precast block 2 is anchored to the lower base 1 or annular precast block 2 using two connecting screws 33. The connecting screws 33 in the lower annular precast block 2 and the connecting screws 33 in the upper annular precast block 2 are staggered to avoid mutual interference between the upper and lower connecting screws 33, while realizing the connection and fixation between the upper and lower annular precast blocks 2.

[0050] As attached Figure 7 Appendix Figure 9 As shown, after the open precast blocks 22 are stacked to a certain height, straight precast blocks 21 are used instead; a turning joint 34 is added between the open precast blocks 22 and the straight precast blocks 21; as shown in the attached figure. Figure 11 Appendix Figure 12 As shown, the steering joint 34 consists of a threaded rod 341 and a threaded sleeve 342. The threaded sleeve 342 is connected to the threaded rod 341 via a pin 343, as shown in the attached figure. Figure 10 As shown, the threaded rod 341 of the swivel joint 34 is anchored to the pre-embedded threaded sleeve 31 inside the open precast block 22, and the connecting bolt 33 inside the upper cylindrical precast block 21 of the open precast block 22 is anchored to the threaded sleeve 342 of the swivel joint 34. Since the pre-embedded threaded sleeves 31 inside the open precast block 22 and the cylindrical precast block 21 are not on the same axis, a swivel joint 34 is added to the open precast block 22, and the threaded sleeve 342 of the swivel joint 34 can be connected to the threaded sleeve 342 of the swivel joint 34. Rotating the threaded rod 341, the threaded rod 341 of the steering joint 34 is on the same axis as the pre-embedded threaded sleeve 31 in the open precast block 22. By adjusting the threaded sleeve 342 of the steering joint 34 so that it is on the same axis as the pre-embedded threaded sleeve 31 in the straight precast block 21, the axis of the open precast block 22 and the pre-embedded threaded sleeve 31 in the straight precast block 21 are deflected, thereby realizing the connection and anchoring between adjacent open precast blocks 22 and straight precast blocks 21.

[0051] Step 4. As attached Figure 15As shown, select appropriate-sized primary filter basket 421, secondary filter basket 422, and tertiary filter basket 423 to assemble a multi-stage filter basket 42 filtration system, and hang the multi-stage filter basket 42 on the top annular precast block 2, and fit the vertical filter cylinder 41 on the outside of the annular precast block 2.

[0052] As attached Figure 13 To be continued Figure 15 As shown, the primary filter basket 421, secondary filter basket 422, and tertiary filter basket 423 are all composed of annular wing plates 424, annular base plates 425, side filter screens 426, base plate filter screens 427, and connecting sleeves 428. The annular wing plates 424 and annular base plates 425 are respectively fixed to the upper and lower edges of the side filter screens 426. The edge of the base plate filter screen 427 is fixed to the annular base plate 425. The lower end of the connecting sleeve 428 passes through the center of the base plate filter screen 427 and is fixed to it. The primary filter basket 421, secondary filter basket 422, and tertiary filter basket 423 have various diameter specifications, according to... The diameter of the annular precast block 2 is reasonably selected to match the diameter of the primary filter basket 421, secondary filter basket 422, and tertiary filter basket 423 to form a multi-stage filter basket 42 filtration system. The outer diameter of the annular wing plate 424 of the primary filter basket 421 is slightly larger than the inner diameter of the top annular precast block 2, ensuring that the primary filter basket 421 can be erected and suspended on the top annular precast block 2 through the annular wing plate 424. The installation of the multi-stage filter basket 42 by suspension reduces the installation difficulty of the multi-stage filter basket 42, and at the same time facilitates the removal of the multi-stage filter basket 42 filtration system for raising the annular precast block 2 and cleaning the mud and sand inside the multi-stage filter basket 42. The primary filter basket 421, secondary filter basket 422, and tertiary filter basket 423 are connected in series using fixing bolts 429 to form a multi-stage filter system. The aperture of the vertical filter cylinder 41 is greater than that of the primary filter basket 421, which is greater than that of the secondary filter basket 422, which is greater than that of the tertiary filter basket 423. The vertical filter cylinder 41 forms the first filtration barrier on the outside of the annular precast block 2, which has a good effect on reducing water flow velocity and improving sediment sedimentation. The multi-stage filter basket 42 forms the second multi-stage filtration barrier, which filters the sediment flowing into the drainage system in multiple stages, preventing sediment from entering the water outside the reclamation area with the water flow and reducing the pollution of the water environment caused by reclamation operations.

[0053] Step 5. Begin the dredging operation by supplying slurry to the reclamation area, and keep the outlet of the slurry delivery pipeline away from the drainage system of the annular precast block 2 assembly to prevent the slurry from flowing directly into the drainage system, as shown in the attached diagram. Figure 16 As shown.

[0054] Step 6. During the reclamation operation, promptly clean the silt filtered into the multi-stage filter basket 42, and add annular precast blocks 2 as the sediment layer 55 and water level rise. Anchor the added annular precast blocks 2 to the lower annular precast blocks 2 as described in Step 3, as shown in the attached diagram. Figure 16 As shown.

[0055] Step 7. After the dredging operation is completed and the sedimentary soil layer 55 has consolidated to the design requirements, remove the drainage system, dismantle the connecting bolts 33 layer by layer, and lift the annular precast block 2 and the base 1 out of the sedimentary soil layer 55, as shown in the attached diagram. Figure 17 As shown.

[0056] Step 8. Use backfill soil 56 to backfill and compact the pits left by the base 1 and the ring-shaped precast block 2 in the sedimentary soil layer 55, as shown in the attached diagram. Figure 17 As shown.

[0057] The present invention has been described in detail above with reference to the embodiments, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made in accordance with the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A multi-stage prefabricated ecological drainage system for reclamation areas, characterized in that: It consists of a base (1), an annular precast block (2), a connecting screw (33), a vertical filter cylinder (41), a multi-stage filter basket (42), and a drain pipe (62); The base (1) is an inverted cone-shaped concrete structure with a larger top and a smaller bottom, and a drainage outlet (11) is provided on the side; the annular precast block (2) is integrally cast using permeable concrete, and the annular precast block (2) is divided into a straight cylindrical precast block (21) and an open precast block (22). Multiple open precast blocks (22) are stacked layer by layer on the base (1), and the diameter of the open precast block (22) gradually increases from bottom to top, forming an inverted cone shape; the straight cylindrical precast block (21) is stacked layer by layer on the top open precast block (22), and the diameter of the straight cylindrical precast block (21) is equal to the diameter of the top section of the top open precast block (22); Both the base (1) and the annular precast block (2) have pre-embedded threaded sleeves (31). The connecting screw (33) passes through the pre-embedded threaded sleeve (31) in the upper annular precast block (2) and is anchored in the pre-embedded threaded sleeve (31) in the lower annular precast block (2) or the base (1). The multi-stage filter basket (42) is composed of a primary filter basket (421), a secondary filter basket (422), and a tertiary filter basket (423). Each of the primary filter basket (421), secondary filter basket (422), and tertiary filter basket (423) is composed of an annular wing plate (424), an annular bottom plate (425), a side filter screen (426), a bottom plate filter screen (427), and a connecting sleeve (428). The primary filter basket (421), secondary filter basket (422), and tertiary filter basket (423) are connected in series with fixing bolts (429) to form a multi-stage filter basket (42) filtration system. The multi-stage filter basket (42) is suspended on the top annular precast block (2), and the vertical filter cylinder (41) is vertically fitted on the outside of the annular precast block (2). A cofferdam is constructed at the edge of the reclamation area. One end of the drainage pipe (62) is inserted into the drainage port (11) of the base (1), and the other end of the drainage pipe (62) passes out from under the cofferdam (61). The primary filter basket (421), secondary filter basket (422), and tertiary filter basket (423) have various diameter specifications. The primary filter basket (421), secondary filter basket (422), and tertiary filter basket (423) with different diameter specifications are reasonably selected according to the diameter of the annular precast block (2) to form a multi-stage filter basket (42) filtration system. The outer diameter of the annular wing plate (424) of the primary filter basket (421) is slightly larger than the inner diameter of the top annular precast block (2). The aperture of the vertical filter cartridge (41) is greater than that of the first-stage filter basket (421), which is greater than that of the second-stage filter basket (422), which is greater than that of the third-stage filter basket (423).

2. The multi-stage prefabricated ecological drainage system for reclamation areas according to claim 1, characterized in that, There are four pre-embedded threaded sleeves (31) in the base (1) and the annular precast block (2). The four pre-embedded threaded sleeves (31) are evenly arranged in the circumference, and the pre-embedded threaded sleeves (31) of the upper and lower layers are aligned with each other. Each annular precast block (2) is anchored to the lower base (1) or annular precast block (2) by two connecting screws (33). The connecting screws (33) in the lower annular precast block (2) and the connecting screws (33) in the upper annular precast block (2) are staggered.

3. The multi-stage prefabricated ecological drainage system for reclamation areas according to claim 1, characterized in that, A swivel joint (34) is added between the open precast block (22) and the straight precast block (21). The swivel joint (34) consists of a threaded rod (341) and a threaded sleeve (342). The threaded sleeve (342) is connected to the threaded rod (341) through a pin (343). The threaded rod (341) of the swivel joint (34) is anchored on the pre-embedded threaded sleeve (31) in the open precast block (22). The connecting screw (33) in the upper straight precast block (21) of the open precast block (22) is anchored on the threaded sleeve (342) of the swivel joint (34).

4. The multi-stage prefabricated ecological drainage system for reclamation areas according to claim 1, characterized in that, The base (1) and the annular precast block (2) are provided with a lifting ring (32), the lifting ring (32) has a recess, and the lifting ring (32) is flush with the upper surface of the base (1) or the annular precast block (2).

5. The multi-stage prefabricated ecological drainage system for reclamation areas according to claim 1, characterized in that, The annular wing plate (424) and the annular base plate (425) are respectively fixed to the upper and lower edges of the side filter (426). The edge of the base plate filter (427) is fixed to the annular base plate (425). The lower end of the connecting sleeve (428) passes through the center of the base plate filter (427) and is fixed to the base plate filter (427).

6. The multi-stage prefabricated ecological drainage system for reclamation areas according to claim 1, characterized in that, The base (1) and drainage pipe (62) are set in the original ground (51) of the reclamation area. The top surface of the base (1) is flush with the original ground (51). A compacted base layer (52) is provided below the base (1) and drainage pipe (62), and a backfill sand and gravel layer (53) is provided around it. A compacted clay layer (54) is covered on the backfill sand and gravel layer (53). The cofferdam (61) is located on the compacted clay layer (54).

7. A construction method for a multi-stage prefabricated ecological drainage system in a reclamation area according to any one of claims 1 to 6, characterized in that, The construction steps include the following: Step 1. Make a base (1) and an annular precast block (2), and set a pre-embedded threaded sleeve (31) and a lifting ring (32) in the base (1) and the annular precast block (2). The base (1) is formed by integral concrete casting, and the annular precast block (2) is formed by integral permeable concrete casting. Step 2. Install the base (1) and drainage pipe (62) at the lower part of the reclamation area. Excavate a trench downward on the original ground (51). Set a compacted base layer (52) at the bottom of the trench. Install the base (1) and drainage pipe (62) in the trench. Set a backfill sand and gravel layer (53) in the trench. Cover the backfill sand and gravel layer (53) with a compacted clay layer (54). Then construct a cofferdam (61) along the edge of the reclamation area. Step 3. Stack the annular precast blocks (2) layer by layer on the base (1). Multiple open precast blocks (22) are stacked layer by layer on the base (1). The diameter of the open precast blocks (22) gradually increases from bottom to top, and the whole is in the shape of an inverted cone. Use connecting screws (33) to fix the annular precast blocks (2). The connecting screws (33) pass through the pre-embedded threaded sleeves (31) in the upper annular precast blocks (2) and are anchored in the pre-embedded threaded sleeves (31) in the lower annular precast blocks (2) or the base (1). After the annular precast blocks (2) are installed in place, wrap a layer of geotextile (23) on the outside of the annular precast blocks (2). Step 4. Select appropriate-sized primary filter baskets (421), secondary filter baskets (422), and tertiary filter baskets (423) to assemble a multi-stage filter basket (42) filtration system, and hang the multi-stage filter baskets (42) on the top ring precast block (2), and put the vertical filter cylinder (41) on the outside of the ring precast block (2); Step 5. Start the dredging operation by supplying slurry to the reclamation area and keep the outlet of the slurry conveying pipe away from the drainage system of the annular precast block (2) assembly to prevent the slurry from flowing directly into the drainage system; Step 6. During the dredging operation, promptly clean the silt filtered in the multi-stage filter basket (42), and add annular precast blocks (2) as the sediment layer (55) and water level rise, and anchor the added annular precast blocks (2) to the lower annular precast blocks (2) according to the method described in Step 3. Step 7. After the dredging operation is completed, once the sedimentary soil layer (55) has solidified to the design requirements, remove the drainage system, remove the connecting bolts (33) layer by layer, and lift the annular precast block (2) and the base (1) out of the sedimentary soil layer (55); Step 8. Use backfill soil (56) to backfill and compact the pits left by the base (1) and the ring precast block (2) in the sedimentary soil layer (55).

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