Construction method of plugboard-type precast misaligned cross-well ecological revetment

Abstract

The invention discloses a construction method for an inserted plate type prefabricated misaligned water passing well ecological revetment, which mainly includes the installation of a prefabricated foundation, the installation of a prefabricated misaligned water passing well, the installation of a prefabricated L-shaped inserted plate, the casting of post-cast concrete, the filling inside and at the back of the prefabricated misaligned water passing well, and the construction of the bank slope. The invention uses a lifting tool to lower the prefabricated misaligned water passing well along the foundation limit block to realize the precise positioning and installation of the prefabricated well at one time, and then bolts the well and the foundation from the outside of the prefabricated well; then inserts the prefabricated L-shaped inserted plate between the card slots of the prefabricated well to synchronously install the retaining plate and the hydrophilic plate; further pours concrete in the groove of the prefabricated foundation to connect the prefabricated well, the inserted plate and the foundation into a whole; then fills multi-stage filter materials inside and at the back of the prefabricated well to realize the exchange of river and bank water quality. The revetment of the invention has good ecological performance, high construction efficiency, convenient operation, stable structure, small floor area and high industrialization degree.

Description

Technical Field

[0001] The invention relates to a construction method of an inserted - plate type prefabricated misaligned overflow well ecological revetment, belonging to the field of water conservancy projects, applicable to river revetment construction, especially applicable to river revetment construction with limited land use scope and high requirements for ecology, landscape and hydrophilicity. Background Technique

[0002] Traditional revetments are reinforced concrete rigid revetments, which are widely used in various projects. The retaining wall body and the retaining wall bottom slab form a closed barrier, hindering the water - soil exchange on both sides of the wall, sealing the soil on which aquatic plants and animals depend for survival, and blocking the original ecological chain of the river and the bank. In addition, water landscapes and water ecosystems all depend on rivers or lakes. The waterfront has become an important cultural resort for people to travel, relax and get close to nature. Urban residents are eager to improve the ecology, hydrophilicity and landscape. Moreover, the land in urban living areas is precious and in short supply, requiring the revetment structure to occupy as little land as possible. Therefore, how to ensure the structural safety and reliability of the revetment structure, while simultaneously meeting the requirements of hydrophilicity, ecological protection, environmental beautification, flood discharge safety, and having good hydrophilic ecological landscape functions, and occupying less land is an urgent problem to be solved.

[0003] In view of the above problems, it is particularly crucial to develop a construction method of an inserted - plate type prefabricated misaligned overflow well ecological revetment with good ecology, landscape and hydrophilicity, high construction efficiency, convenient operation, stable structure, small floor area, high industrialization level and little construction pollution. The present invention is developed under such a background and will surely achieve obvious economic and social benefits when applied to actual river revetment construction. Summary of the Invention

[0004] The purpose of the present invention is to propose a construction method of an inserted - plate type prefabricated misaligned overflow well ecological revetment in view of the problems of the traditional river revetment such as the inability of water - soil exchange, the interruption of the ecological chain, and poor ecology, hydrophilicity and landscape. This ecological revetment has good ecology, landscape and hydrophilicity, high construction efficiency, convenient operation, stable structure, small floor area, high industrialization level and little construction pollution.

[0005] In order to achieve the above - mentioned technical objectives, the present invention adopts the following technical solutions:

[0006] The construction method of the inserted - plate type prefabricated misaligned overflow well ecological revetment includes the following steps:

[0007] Step 1. Installation of precast foundation: Excavate and trim the riverbed and bank according to the design drawings; Measure and lay out the position lines of the cast-in-place piles on the riverbed, drill holes, lower the steel reinforcement cages, and pour concrete to form the cast-in-place piles; Construct the foundation cushion on the upper part of the cast-in-place piles, and then lay the precast foundation section by section in the order of "from one side to the other side" on the upper part of the foundation cushion to ensure that the installation of the precast foundation is straight and the joints are tightly connected; Finally, fill the riprap on the water-facing side of the precast foundation and grout it.

[0008] Step 2. Installation of precast offset water wells: Lift the precast offset water wells one by one to the upper part of the precast foundation in the order of "from one side to the other side", and then use the limit blocks to achieve the precise positioning of the precast wells for the first time. Specifically: Manually fine-tune the position of the precast well to align the lower part of the well with the limit blocks, and slowly lower the precast well using the lifting tool. When the well body is stably placed in the precast foundation, the lifting tool can be released without secondary adjustment of the installation position of the precast well; Subsequently, complete the bolt connection and fixation between the well body and the precast foundation outside the precast well. Specifically, screw the screw into the threaded sleeve from the bolt hole, and workers do not need to enter the well during the fixation process.

[0009] Step 3. Installation of precast L-shaped inserts: Insert precast L-shaped inserts between the card slots of adjacent precast offset water wells (simultaneously realizing the installation of the retaining wall and the hydrophilic plate), ensure that the lower part of the retaining wall firmly abuts against the insert groove, and ensure that both sides of the hydrophilic plate firmly overlap on the upper part of the side wall of the precast well; Subsequently, construct stepped gabions on the water-facing side of the precast L-shaped inserts.

[0010] Step 4. Pouring of post-cast concrete: Pour post-cast concrete (the post-cast concrete is selected as fine aggregate concrete one grade higher than the precast foundation) into the recesses of the double-square-well and the insert grooves to connect the precast offset water wells, precast L-shaped inserts and the precast foundation into a whole.

[0011] Step 5. Filling inside and at the back of the precast offset water wells: Synchronously fill the water storage riprap in layers inside and behind the precast offset water wells to connect the fillers inside and outside the well (an anti-filter layer is laid at the bottom and the water-facing side of the water storage riprap, and the top elevation of the water storage riprap is flush with the upper edge of the water inlet); Subsequently, fill the filter gravel B and backfill soil upward in sequence behind the well (an anti-filter layer is laid at the bottom and the water-facing side of the filter gravel B and the backfill soil); Further fill the filter gravel A, sand filter layer, and planting soil A upward in sequence inside the well; Finally, form a multi-level water quality purification and drainage and storage system that is interconnected between the water banks.

[0012] Step 6. Construction of the bank slope: Lay an anti-filter layer, pour vegetative concrete and fill planting soil B on the upper part of the backfill soil.

[0013] Preferably, the precast offset water well is composed of a water-facing wall, a backwater wall and side walls on both sides; a notch is arranged on the upper part of the water-facing wall, and bolt holes are arranged on the lower part; the lower edge of the notch is slightly lower than the normal water level; a water inlet is arranged on the lower part of the backwater wall; card slots are arranged on the outer side of the side walls.

[0014] Preferably, the precast L-shaped insertion plate is composed of a vertical retaining plate and a horizontal hydrophilic plate.

[0015] Preferably, a limit block, a double-square well groove and an insertion plate groove are arranged on the upper part of the precast foundation; threaded sleeves are arranged on both sides of the limit block.

[0016] The present invention has the following characteristics and beneficial effects:

[0017] (1) Good ecological, landscape and hydrophilic properties. The precast offset overflow well has offset openings before and after, breaking the closed interface of the traditional pile-sheet wall, forming a channel for water quality exchange between the river and the bank, and the offset openings extend the path of water quality circulation, enabling the water quality to be fully purified and stored in the multi-stage fillers inside and outside the well. At the same time, a hydrophilic plate is arranged on the upper part of the precast L-shaped insertion plate, and aquatic plants are planted in the wells on both sides of the hydrophilic plate, creating a good-looking hydrophilic space above the normal water level. In addition, a stepped gabion is constructed on the water-facing side of the precast L-shaped insertion plate, providing more living space for aquatic animals and plants, while dissipating the impact force of the water flow and enriching the landscape effect of the bank protection.

[0018] (2) High construction efficiency and convenient operation. The precast offset overflow well can be accurately positioned in one go through the foundation limit block. After the well body is lowered and positioned, there is no need for secondary adjustment of the installation position, and the bolt connection between the precast well and the precast foundation can be realized only outside the well, and workers do not need to enter the well for operation, with higher safety. At the same time, by inserting precast L-shaped insertion plates between the precast wells, the retaining plate and the hydrophilic plate can be installed synchronously. Compared with the traditional block-type retaining plate, the construction efficiency is greatly improved, and there is no need to additionally build a hydrophilic platform.

[0019] (3) Stable structure. Post-cast concrete is poured into the foundation groove to connect the precast well, the insertion plate and the foundation into a whole to jointly bear the force. The overall structure is more stable, the stress effect is better, and the service life and safety performance of the bank protection structure are extended. At the same time, crushed stones are filled inside and at the back of the precast well. On the one hand, the earth pressure behind the well is reduced, and on the other hand, the large pores of the crushed stones can reduce the adverse effects of the residual water pressure and seepage force on the slope when the water level drops. In addition, an anti-filter layer is laid at the bottom of the multi-stage fillers at the back of the precast well and on the water-facing side, which can effectively prevent the loss of the embankment soil quality and achieve a good retaining effect.

[0020] (4) Small floor area. The width of the precast offset overflow well is relatively narrow, only occupying a small cross-section of the water flow, without affecting the navigation space of the river channel, and can meet the requirements of bank protection construction for narrow urban inland rivers, with a wide application range.

[0021] (5) High degree of industrialization and little construction pollution. The precast misaligned water intake well, precast L-shaped insertion plate and precast foundation are all standardized precast components with a high degree of industrialization and guaranteed quality, greatly reducing the amount of wet work on the construction site and resulting in less construction pollution. Description of the Drawings

[0022] Figure 1 It is the sectional view of the ecological revetment with inserted plate type precast misaligned water intake well (at the precast misaligned water intake well part);

[0023] Figure 2 It is the sectional view of the ecological revetment with inserted plate type precast misaligned water intake well (at the precast L-shaped insertion plate part);

[0024] Figure 3 It is the schematic diagram of installing the precast L-shaped insertion plate between the precast misaligned water intake wells;

[0025] Figure 4 It is the three-dimensional view of the precast misaligned water intake well;

[0026] Figure 5 It is the three-dimensional view of the precast L-shaped insertion plate;

[0027] Figure 6 It is the top view of the precast foundation;

[0028] Figure 7 It is Figure 6 The A-A sectional view of the precast foundation;

[0029] Figure 8 It is Figure 6 The B-B sectional view of the precast foundation;

[0030] Figure 9 It is the schematic diagram of installing the precast foundation;

[0031] Figure 10 It is the schematic diagram of installing the precast misaligned water intake well;

[0032] Figure 11 It is the schematic diagram of installing the precast L-shaped insertion plate;

[0033] Figure 12 It is the schematic diagram of pouring the post-cast concrete;

[0034] Figure 13 It is the schematic diagram of filling inside and at the back of the precast misaligned water intake well;

[0035] Figure 14 It is the schematic diagram of the bank slope construction.

[0036] In the figure: 1. Prefabricated offset water well, 101. Water-facing wall, 1011. Notch, 1012. Bolt hole, 102. Back wall, 1021. Water outlet, 103. Side wall, 1031. Slot, 2. Prefabricated L-shaped plug plate, 201. Retaining plate, 202. Hydrophilic board, 3. Prefabricated foundation, 301. Limit block, 3011. Threaded sleeve, 302. U-shaped well recess Trough, 303. Insert groove, 4. Post-cast concrete, 5. Riverbed, 6. Embankment, 7. Cast-in-place piles, 8. Foundation cushion, 9. Water storage stone, 10. Filter gravel A, 11. Sand filter layer, 12. Planting soil A, 13. Filter gravel B, 14. Backfill soil, 15. Vegetation concrete, 16. Planting soil B, 17. Step-shaped Binger gabion, 18. Block stone, 19. Normal water level. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below with reference to the accompanying drawings and by examples, which are explanations of the present invention and are not limited to the following examples. In a river bank protection project, the width of the river is less than 5m, and a construction method of a plug-in type prefabricated staggered water well ecological bank protection is adopted.

[0038] Combined with Figure 1 ~Attached Figure 3As shown in the figure, the inserted panel type precast misaligned overflow well ecological revetment involved in the present invention includes cast-in-place piles 7, precast foundations 3, precast misaligned overflow wells 1, and precast L-shaped inserts 2. The cast-in-place piles 7 are driven into the riverbed 5, and a foundation cushion layer 8 is poured on the upper part thereof. The foundation cushion layer 8 is made of C10 plain concrete. The precast foundation 3 is masonry-built on the upper part of the foundation cushion layer 8 with mortar. 10 - 100 kg of crushed stones 18 are filled and grouted on the water-facing side of the precast foundation 3. The crushed stones 18 are processed from quarry stones. A number of precast misaligned overflow wells 1 are installed on the upper part of the precast foundation 3. The precast misaligned overflow wells 1 are clamped outside the limit blocks 301 and are fixedly connected to the threaded sleeves 3011 in the precast foundation 3 by bolts. Post-cast concrete 4 is poured in the foundation grooves. The post-cast concrete 4 is made of C30 fine aggregate concrete. The precast L-shaped inserts 2 are inserted between the precast misaligned overflow wells 1 through the card slots 1031. The bottom of the retaining plate 201 abuts directly against the foundation groove, and both sides of the hydrophilic plate 202 are placed on the top of the side wall 103. A stepped gabion 17 is constructed on the water-facing side of the precast L-shaped insert 2, and aquatic plants are planted on the filled soil on the upper part of each step surface of the stepped gabion 17. Water storage crushed stones 9 are filled in layers inside and behind the precast misaligned overflow wells 1. The water storage crushed stones 9 are processed from quarry stones. The water storage crushed stones 9 are irregular in shape and have a side length of not less than 15 cm, a density of 2.5 g / cm³, and a mud content of not more than 10%. The water storage crushed stones 9 are filled with filter gravel A11, sand filter layer 11, and planting soil A12 in sequence inside the well. The filter gravel A11 is 350 mm thick, the sand filter layer 11 is made of medium-coarse sand with a thickness of 50 mm, and the planting soil A12 is 150 mm thick. Emergent plants are planted in the planting soil A12. Filter gravel B13 and backfill soil 14 are filled in sequence behind the well. Vegetation concrete 15 is poured and planting soil B16 is filled on the upper part of the backfill soil 14. A filter layer is laid on the bottom and the water-facing side of the water storage crushed stones 9, filter gravel B13, backfill soil 14, and vegetation concrete 15. The filter layer is made of permeable geotextile.

[0039] As Figure 4 shown, the precast misaligned overflow well 1 is a C25F50 reinforced concrete structure with a wall thickness of 200 mm, a length of 1.2 m, a width of 0.9 m, and a height of 2 m. It is composed of a water-facing wall 101, a backwater wall 102, and side walls 103 on both sides. A notch 1011 is opened on the upper part of the water-facing wall 101, and a bolt hole 1012 is opened on the lower part. The lower edge of the notch 1011 is slightly lower than the normal water level 19. An overflow opening 1021 is opened on the lower part of the backwater wall 102. Card slots 1031 are arranged on the outer sides of the side walls 103.

[0040] As Figure 5 shown, the precast L-shaped insert 2 is a C25F50 reinforced concrete structure with a wall thickness of 150 mm. It is composed of a vertical retaining plate 201 and a horizontal hydrophilic plate 202. The retaining plate 201 has a height of 2 m and a width of 0.8 m, and the hydrophilic plate 202 has a length of 1.1 m and a width of 0.85 m.

[0041] AsFigures 6 - 8 As shown in the figure, the precast foundation 3 is a C25F50 reinforced concrete structure, with a double-square well groove 302 and a socket groove 303 opened on its upper part, and a limit block 301 is embedded. The depth of the groove is 200 mm. Threaded sleeves 3011 are embedded on both sides of the limit block 301, and the positions of the threaded sleeves 3011 correspond to the bolt holes 1012.

[0042] As Figure 9 As shown in the figure, the riverbed 5 and the bank 6 are excavated and trimmed according to the design drawings; the position lines of the cast-in-place piles 7 are measured and laid on the riverbed 5, and the cast-in-place piles 7 are formed by drilling, lowering the steel reinforcement cage, and pouring concrete; the foundation cushion 18 is constructed on the upper part of the cast-in-place piles 7, and then the precast foundation 3 is built section by section in the order of "from one side to the other side" on the upper part of the foundation cushion 18 to ensure that the precast foundation 3 is installed straight and tightly jointed; finally, the rubble 18 is filled and grouted on the water-facing side of the precast foundation 3.

[0043] As Figure 10 As shown in the figure, the precast offset water wells 1 are hoisted one by one above the precast foundation 3 in the order of "from one side to the other side", and then the limit block 301 is used to achieve the first precise positioning of the precast well. Specifically: manually fine-tune the position of the precast well so that the lower part of the well is aligned with the limit block 301, and slowly lower the precast well using the lifting tool. When the well body is stably placed in the precast foundation 3, the lifting tool can be released, and there is no need to adjust the installation position of the precast well for the second time; then, the bolt connection and fixation between the well body and the precast foundation 3 are completed outside the precast well. Specifically, the screw rod is screwed into the threaded sleeve 3011 from the bolt hole 1012, and the workers do not need to enter the well during the fixation process.

[0044] As Figure 11 As shown in the figure, the precast L-shaped inserts 2 are inserted between the card slots 1031 of adjacent precast offset water wells 1 (simultaneously realizing the installation of the retaining plate 201 and the hydrophilic plate 202), ensuring that the lower part of the retaining plate 201 firmly abuts against the socket groove 303, and ensuring that both sides of the hydrophilic plate 202 firmly overlap on the upper part of the side wall 103 of the precast well; then, the stepped gabion 17 is constructed on the water-facing side of the precast L-shaped insert 2.

[0045] As Figure 12 As shown in the figure, the post-cast concrete 4 (the post-cast concrete 4 is selected as fine aggregate concrete one grade higher than the precast foundation 3) is poured into the double-square well groove 302 and the socket groove 303 to connect the precast offset water well 1, the precast L-shaped insert 2 and the precast foundation 3 into a whole.

[0046] As Figure 13As shown in the figure, in the well of the prefabricated offset overflow well 1 and behind the well, water storage crushed stones 9 are filled in layers synchronously, and the fillers inside and outside the well are connected (an anti-filter layer is laid at the bottom and the water-facing side of the water storage crushed stones 9, and the top elevation of the water storage crushed stones 9 is flush with the upper edge of the water overflow port 1021); then, filter water crushed stones B13 and backfill soil 14 are filled upward in sequence behind the well (an anti-filter layer is laid at the bottom and the water-facing side of the filter water crushed stones B13 and the backfill soil 14); further, filter water crushed stones A10, sand filter layer 11, and planting soil A12 are filled upward in sequence inside the well; finally, a multi-stage water quality purification and drainage and storage system that communicates with each other is formed between the water banks.

[0047] As Figure 14 shown, an anti-filter layer is laid on the upper part of the backfill soil 14, vegetative concrete 15 is poured, and planting soil B16 is filled.

[0048] The construction steps of the inserted plate type prefabricated offset overflow well ecological revetment include:

[0049] Step 1: Installation of precast foundation: Excavate and trim the riverbed 5 and the bank 6 according to the design drawings; Measure and set the position line of the cast-in-place pile 7 on the riverbed 5, drill holes, lower the steel reinforcement cage, and pour concrete to form the cast-in-place pile 7; Construct the foundation cushion 18 on the upper part of the cast-in-place pile 7, and then successively lay the precast foundation 3 section by section in the order of "from one side to the other side" on the upper part of the foundation cushion 18 to ensure that the precast foundation 3 is installed straight and the joints are tightly connected; Finally, fill the water-facing side of the precast foundation 3 with rubble 18 and grout.

[0050] Step 2: Installation of prefabricated offset overflow well: Lift each prefabricated offset overflow well 1 to the upper part of the precast foundation 3 in the order of "from one side to the other side", and then use the limit block 301 to achieve the first precise positioning of the precast well. Specifically: Manually fine-tune the position of the precast well to align the lower part of the well with the limit block 301, and slowly lower the precast well using the lifting tool. When the well body is stably placed in the precast foundation 3, the lifting tool can be removed, and there is no need to adjust the installation position of the precast well for the second time; Then, complete the bolt connection and fixation between the well body and the precast foundation 3 outside the precast well. Specifically, screw the screw into the threaded sleeve 3011 from the bolt hole 1012. During the fixation process, workers do not need to enter the well for operation.

[0051] Step 3: Installation of prefabricated L-shaped inserted plate: Insert the prefabricated L-shaped inserted plate 2 between the card slots 1031 of adjacent prefabricated offset overflow wells 1 (simultaneously realizing the installation of the retaining plate 201 and the hydrophilic plate 202), ensure that the lower part of the retaining plate 201 firmly abuts against the inserted plate groove 303, and ensure that both sides of the hydrophilic plate 202 firmly overlap on the upper part of the side wall 103 of the precast well; Then, construct the stepped gabion 17 on the water-facing side of the prefabricated L-shaped inserted plate 2.

[0052] Step 4: Pouring of post-cast concrete: Pour post-cast concrete 4 (the post-cast concrete 4 is selected as fine aggregate concrete one grade higher than the precast foundation 3) into the groove 302 of the figure-eight well and the groove 303 of the insertion plate, connecting the precast offset water intake well 1, the precast L-shaped insertion plate 2 and the precast foundation 3 to form an integral whole.

[0053] Step 5: Filling inside and at the back of the precast offset water intake well: Synchronously and layer by layer fill the inside and at the back of the precast offset water intake well 1 with water storage crushed stones 9, making the fillers inside and outside the well communicate with each other (an anti-filter layer is laid at the bottom and the water-facing side of the water storage crushed stones 9, and the top elevation of the water storage crushed stones 9 is flush with the upper edge of the water intake opening 1021); then, fill the back of the well with filter water crushed stones B13 and backfill soil 14 layer by layer in sequence (an anti-filter layer is laid at the bottom and the water-facing side of the filter water crushed stones B13 and the backfill soil 14); further, fill the inside of the well with filter water crushed stones A10, sand filter layer 11 and planting soil A12 layer by layer in sequence; finally, a multi-level water quality purification and drainage and storage system that communicates with each other is formed between the water banks.

[0054] Step 6: Construction of the bank slope: Lay an anti-filter layer, pour vegetation concrete 15 and fill planting soil B16 on the upper part of the backfill soil 14.

[0055] The present invention has been described in detail in combination with the embodiments, but the above content is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. Any equivalent changes and improvements made according to the scope of the application of the present invention shall still fall within the scope covered by the patent of the present invention.

Claims

1. Construction method of plugboard-type precast misaligned overflow well ecological revetment, characterized in that, It includes the following steps: Step 1. Installation of precast foundation: Excavate and trim the riverbed (5) and the bank (6) according to the design drawings; Measure and set the position line of the cast-in-place pile (7) on the riverbed (5), drill holes, lower the steel reinforcement cage, and pour concrete to form the cast-in-place pile (7); Construct the foundation cushion (8) on the upper part of the cast-in-place pile (7), and then successively lay the precast foundation (3) section by section in the order of "from one side to the other side" on the upper part of the foundation cushion (8) to ensure that the installation of the precast foundation (3) is straight and the joints are tightly connected; Finally, fill the riprap (18) on the water-facing side of the precast foundation (3) and grout; Step 2. Installation of precast misaligned water intake well: Lift the precast misaligned water intake well (1) one by one to the upper part of the precast foundation (3) in the order of "from one side to the other side", and then use the limit block (301) to achieve the first precise positioning of the precast well. Specifically: Manually fine-tune the position of the precast well to align the lower part of the well with the limit block (301), and slowly lower the precast well using the lifting tool. When the well body is stably placed in the precast foundation (3), the lifting tool can be released without secondary adjustment of the installation position of the precast well; Then, complete the bolt connection and fixation between the well body and the precast foundation (3) outside the precast well. Specifically, screw the screw into the threaded sleeve (3011) from the bolt hole (1012). During the fixation process, workers do not need to enter the well for operation; Step 3. Installation of precast L-shaped insert plate: Insert the precast L-shaped insert plate (2) between the card slots (1031) of adjacent precast misaligned water intake wells (1), and simultaneously install the retaining plate (201) and the hydrophilic plate (202) to ensure that the lower part of the retaining plate (201) firmly abuts against the insert plate groove (303), and ensure that both sides of the hydrophilic plate (202) firmly overlap the upper part of the side wall (103) of the precast well; Then, construct the stepped gabion (17) on the water-facing side of the precast L-shaped insert plate (2); Step 4. Pouring of post-cast concrete: Pour the post-cast concrete (4) into the double-loop well groove (302) and the insert plate groove (303). The post-cast concrete (4) is selected as fine aggregate concrete with a strength grade one higher than that of the precast foundation (3) to connect the precast misaligned water intake well (1), the precast L-shaped insert plate (2), and the precast foundation (3) into a whole; Step 5. Filling inside and at the back of the precast misaligned water intake well: Synchronously and layer by layer fill the water storage riprap (9) inside and at the back of the precast misaligned water intake well (1) to connect the fillers inside and outside the well. The bottom and water-facing side of the water storage riprap (9) are laid with an anti-filter layer, and the top elevation of the water storage riprap (9) is flush with the upper edge of the water intake (1021); Then, successively fill the filter gravel B (13) and the backfill soil (14) upward at the back of the well. The bottom and water-facing side of the filter gravel B (13) and the backfill soil (14) are laid with an anti-filter layer; Further, successively fill the filter gravel A (10), the sand filter layer (11), and the planting soil A (12) upward inside the well; Finally, a multi-stage water quality purification and drainage and storage system that is interconnected is formed between the water banks; Step 6. Construction of the bank slope: Lay an anti-filter layer, pour the vegetation concrete (15), and fill the planting soil B (16) on the upper part of the backfill soil (14); The described prefabricated offset water intake well (1) is composed of a water-facing wall (101), a water-backing wall (102), and side walls (103) on both sides; a notch (1011) is provided at the upper part of the water-facing wall (101), and bolt holes (1012) are provided at the lower part; the lower edge of the notch (1011) is slightly lower than the normal water level (19); a water passage (1021) is provided at the lower part of the water-backing wall (102); a clamping groove (1031) is provided on the outer side of the side wall (103); The described prefabricated L-shaped insertion plate (2) is composed of a vertical retaining plate (201) and a horizontal hydrophilic plate (202); Limit blocks (301), a well-shaped groove (302) in a double-square shape, and an insertion plate groove (303) are provided at the upper part of the prefabricated foundation (3); threaded sleeves (3011) are provided on both sides of the limit block (301).

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