Ecological sheet pile reinforcing structure for existing retaining wall and construction method

Abstract

The application discloses an ecological sheet pile reinforcing structure for existing retaining walls and a construction method, and relates to the technical field of bank protection reinforcement. The reinforcing structure comprises concrete sheet piles arranged on the water side of the existing retaining wall, prefabricated cap beams installed on the top of the sheet piles, and prefabricated ecological planting frames fixed between the cap beams and the existing retaining wall. The concrete sheet piles are in the shape of Chinese character 'ji' and are connected by mortise and tenon joints. Ecological channels are arranged on the sheet piles. The space formed by the concrete sheet piles, the existing retaining wall and the prefabricated ecological planting frames is filled with backfill soil, and a filter layer is arranged at the position corresponding to the ecological channels. During construction, the sheet piles are first pressed into the ground to form a continuous sheet pile wall, then the backfill soil is filled and the filter layer is laid, and finally the cap beams and the ecological planting frames are installed. The application realizes rapid reinforcement of the existing retaining wall, shortens the construction period through prefabricated assembly, minimizes the adverse effects of the reinforcing structure on the navigation width, and promotes water-land ecological exchange and ecological restoration by using the ecological channel and the planting frame system.

Description

Technical Field

[0001] This invention relates to the field of bank protection reinforcement technology, specifically to an ecological sheet pile reinforcement structure and construction method for existing retaining walls. Background Technology

[0002] With the increasing demand for upgrading inland waterways and protecting shorelines, the dredging and widening of existing waterways often necessitates the reinforcement of existing revetment structures to prevent slope collapse and ensure waterway safety. Traditional reinforcement methods (such as demolition and reconstruction or large-scale concrete pouring) are often characterized by large project scale, high costs, long construction periods, and significant navigational obstruction. Furthermore, due to the numerous buildings, power lines, and other structures along the banks of older urban waterways, dredging and widening the waterways presents significant challenges, including the difficulty of demolishing existing structures and high land acquisition costs. Therefore, a green aquatic reinforcement structure that can quickly, efficiently, and cost-effectively reinforce existing retaining walls while maintaining and enhancing the ecological functions of the waterway is of great significance.

[0003] Currently, some existing technologies attempt to combine engineering structures with ecological functions in bank protection schemes. For example, Chinese invention patent application CN110725233A (publication date: January 24, 2020) discloses an ecological bank protection scheme for the management of wandering rivers, including porous concrete piles, ecological connecting plates, ecological viewing corridors, and sloping green belts. The porous concrete piles have an ecological viewing corridor on top, with ecological connecting plates and anchors in the middle, reinforcing the bank protection structure, reducing structural subsidence and displacement, and improving the overall stability of the bank protection project. The ecological connecting plates have ecological holes, which facilitate the exchange of matter and energy between the river channel and the bank slope, enhancing the water body's self-purification capacity. The ecological viewing corridor is planted with green landscape plants, serving as both a habitat for organisms and greening the bank protection. This invention uses a permeable structure, effectively achieving lateral connectivity between water and land, solving the problem of closed rigid bank protection affecting the exchange of matter and energy in the aquatic ecosystem, enhancing the river's self-purification capacity, and simultaneously meeting engineering, ecological, and aesthetic requirements. However, this plan requires driving a large number of piles into the bank slope and assembling complex components on site, which involves a significant degree of modification to the existing bank protection structure. The construction is still quite complex, and it is not adaptable enough to situations where rapid and localized reinforcement is required close to the existing retaining wall.

[0004] For example, Chinese utility model patent CN211312405U (publication date: August 21, 2020) discloses a sheet pile element and a prefabricated ecological revetment structure. The sheet pile element includes a sheet body, and the upper part of the sheet body is provided with ecological permeable wave-dissipating holes. The prefabricated ecological revetment structure includes a sheet pile element, which includes an upper sheet pile part and a lower sheet pile part. The upper sheet pile part is provided with ecological permeable wave-dissipating holes, which connect the navigation and wind and wave affected area with the ecological restoration and reconstruction area. The sheet pile element includes multiple sheet pile units connected in sequence, and at least one of the sheet pile units is a sheet pile element provided with ecological permeable wave-dissipating holes. This utility model's sheet pile components and prefabricated ecological revetment structure can serve as wave absorbers and also provide ecological permeability, facilitating the free migration of animals between navigation and wave-affected areas and ecological restoration and reconstruction areas. The prefabricated sheet pile structure of the ecological revetment can shorten the construction period in water, while reducing construction difficulty and project investment. Although this scheme uses prefabricated components to shorten the construction period, the sheet pile wall itself constitutes a new shoreline, occupying a certain width of waterway. In reinforcement scenarios where it is necessary to strictly maintain or minimize the impact on the existing channel width, this structure may still adversely affect the navigation width. Furthermore, its ecological function mainly relies on the holes in the sheet piles, and its consideration of promoting the exchange of matter and energy between water and land and providing a stable growth substrate for aquatic plants is relatively limited.

[0005] Existing technologies suffer from problems such as significant construction disruption to the existing infrastructure, limited ecological functions, or potential impact on the effective width of waterways. Currently, there is still a need for a bank protection reinforcement structure that can reinforce existing retaining walls with minimal construction disruption and waterway occupation, while simultaneously achieving multiple ecological functions such as aquatic plant planting, water-land ecological connectivity, and water exchange through structural design. Summary of the Invention

[0006] To address the above technical problems, this invention provides an ecological sheet pile reinforcement structure for existing retaining walls, comprising: an existing retaining wall; Concrete sheet piles are arranged in a row along the extension direction of the existing retaining wall, and the bottom of each concrete sheet pile is lower than the design mud surface of the waterway. The precast cap beam is composed of multiple precast cap beam segments spliced ​​together and erected on top of the multiple concrete sheet piles. The bottom is provided with a reserved hole that matches the shape of the top of the concrete sheet pile. The precast cap beam is embedded in the concrete sheet pile. Multiple prefabricated ecological planting frames are fixed to the side of the prefabricated cap beam facing the existing retaining wall, and are partially embedded in the existing retaining wall; Aquatic plants are planted within the prefabricated ecological planting frame; Backfill soil is used to fill the space formed by the concrete sheet piles, the existing retaining wall, and the prefabricated ecological planting frame. An ecological channel, which is a through-hole penetrating the concrete sheet pile body and is used to connect the backfill area and the water area of the waterway; A filter layer, which is laid between the backfill soil and the concrete sheet pile and covers the opening on the soil side of the ecological channel.

[0007] Furthermore, the number of the concrete sheet piles is several, and the cross-section is a "ji" shape. Adjacent two concrete sheet piles are connected to each other by a tenon and mortise type tongue-and-groove structure arranged on their sides.

[0008] Furthermore, the number of the precast cap beams is several, and adjacent precast cap beams are butted and connected by a tenon and mortise type tongue-and-groove structure.

[0009] Furthermore, in the two opposite long sides of the precast ecological planting frame, one long side is provided with a convex part, and the other long side is provided with a concave part matching with the convex part, so that multiple precast ecological planting frames can be spliced and fixed to each other through the fitting of the convex part and the concave part. The convex part and the concave part together form a tongue-and-groove.

[0010] Furthermore, the convex part and the concave part, that is, the tongue-and-groove gap between the mutually spliced precast ecological planting frames, is filled with cement mortar, polymer mortar or a rubber water stop strip is installed. The water stop strip needs to be fixed in the groove and is compacted after splicing, so as to improve the anti-seepage property and integrity of the splicing part.

[0011] Furthermore, on one side of the precast ecological planting frame, the precast cap beam and the precast ecological planting frame are connected into a whole by grouting, and on the other short side, it is embedded in the hollow groove of the existing retaining wall.

[0012] Furthermore, the ecological channels are multiple through-holes opened at intervals on the concrete sheet piles and corresponding to the position of the filter layer; water bodies realize the material and energy exchange between land and water through the ecological channels.

[0013] Furthermore, the filter layer is composed of one of granular materials or geotextiles that are permeable and soil-blocking.

[0014] The present application also provides a construction method for building an ecological sheet pile reinforcement structure for an existing retaining wall, including the following steps: S1. Precast concrete sheet piles, precast cap beams and precast ecological planting frames; S2. On the water-facing side of the existing retaining wall, press the concrete sheet piles into the designed elevation one by one by static pressure; S3. Fill the space between the concrete sheet piles and the existing retaining wall with backfill soil, and lay a filter layer at the ecological channel on the inner side of the concrete sheet piles during the filling process; S4. Embed the precast cap beam at the top of the concrete sheet pile; S5. A groove is chiseled out on the existing retaining wall at the position corresponding to the precast cap beam. The precast ecological planting frame is placed in the groove and fixed on the precast cap beam. Then, aquatic plants are planted in the precast ecological planting frame. S6. Conduct underwater dredging of the waterway.

[0015] Furthermore, in step S2, the concrete sheet piles interlock with each other through the tongue and groove structure on the side to form a continuous sheet pile wall; in step S4, the adjacent precast cap beams are connected by a tenon and mortise joint structure.

[0016] Compared with existing technologies, the advantages and effects of this application are as follows: 1. Compared with existing technologies that require large-scale demolition and reconstruction or the driving of dense pile arrays to form a new shoreline, this invention constructs a single row of "U"-shaped concrete sheet piles within a limited space adjacent to the existing retaining wall, and utilizes precast cap beams to form a reinforcement system together with the existing retaining wall. This structure has a compact cross-section, a small construction area, does not require the demolition of the original structure, and has minimal impact on dredging and widening operations of the waterway.

[0017] 2. This application significantly improves project efficiency and quality control through highly prefabricated and modular construction. The core components of this invention, such as concrete sheet piles, cap beams, and ecological planting frames, are all prefabricated in the factory, with on-site construction primarily involving static pressure pile driving and component embedding. This construction method avoids large-scale underwater cast-in-place concrete work, eliminates the need for cofferdams, shortens the construction period, and reduces construction difficulty and safety risks.

[0018] 3. Unlike existing bank protection technologies with relatively singular ecological functions (such as only permeable water or only wave dissipation), this application creates ecological channels on sheet piles and sets up backfill soil and ecological planting frames. Openings in the precast sheet piles serve as lateral ecological channels, allowing the water body to exchange matter and energy with the land through these channels, forming a structurally stable and ecologically comprehensive green reinforcement system.

[0019] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the preferred embodiments of this application are described in detail below with reference to the accompanying drawings.

[0020] The above and other objects, advantages and features of this application will become more apparent to those skilled in the art from the following detailed description of specific embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0022] in: Figure 1 This is an overall schematic diagram of an ecological sheet pile reinforcement structure for existing retaining walls; Figure 2 This is a partial schematic diagram of an ecological sheet pile reinforcement structure for existing retaining walls; Figure 3 This is a top view of a revetment reinforcement structure using an ecological sheet pile reinforcement structure for existing retaining walls; Figure 4 This is a schematic diagram of a construction method for an ecological sheet pile reinforcement structure used in existing retaining walls.

[0023] Explanation of reference numerals in the attached drawings: 1-Concrete sheet pile; 2-Precast cap beam; 3-Precast ecological planting frame; 4-Aquatic plants; 5-Existing retaining wall; 6-Backfill soil; 7-Ecological passage; 8-Filter layer; A-Original mud surface line of the waterway; B-Design mud surface of the waterway; C-Design water level. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. In the following description, specific details such as specific configurations and components are provided merely to help fully understand the embodiments of this application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. In addition, for clarity and brevity, descriptions of known functions and structures are omitted in the embodiments.

[0025] It should be understood that the phrase "an embodiment" or "this embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "an embodiment" or "this embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0026] Furthermore, reference numerals and / or letters may be repeated in different examples within this application. Such repetition is for the purpose of simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0027] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" describes another type of relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it have an "or" relationship.

[0028] In this article, the term "at least one" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, "at least one of A and B" can mean: A exists alone, A and B exist simultaneously, or B exists alone.

[0029] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion.

[0030] Example 1 This embodiment describes an ecological sheet pile reinforcement structure for existing retaining walls. Please refer to [reference needed]. Figure 1 ; An ecological sheet pile reinforcement structure for existing retaining walls includes: an existing retaining wall 5; Concrete sheet piles 1 are arranged in a row along the extension direction of the existing retaining wall 5, and the bottom end of each concrete sheet pile 1 is lower than the design mud surface B of the waterway. The precast cap beam 2 is composed of multiple precast cap beam segments spliced ​​together and is erected on top of the multiple concrete sheet piles 1. The bottom is provided with a reserved hole that matches the shape of the top of the concrete sheet pile 1. Multiple prefabricated ecological planting frames 3 are fixed to the side of the prefabricated cap beam 2 facing the existing retaining wall 5, and are partially embedded in the existing retaining wall 5; Aquatic plants 4 are planted in the prefabricated ecological planting frame 3; Backfill soil 6 is used to fill the space formed by the concrete sheet piles 1, the existing retaining wall 5, and the prefabricated ecological planting frame 3. Ecological passage 7 is a through hole that penetrates the concrete sheet pile 1 and is used to connect the backfill soil 6 area with the waterway. The filter layer 8 is laid between the backfill soil 6 and the concrete sheet pile 1 and covers the soil-side opening of the ecological channel 7.

[0031] Technical effects of this embodiment: In this embodiment, considering that there are existing structures on the land side of the revetment, a precast sheet pile structure is set in front of the existing revetment for reinforcement; to facilitate underwater construction and not affect the land-water ecological channel, the coping beam above the precast sheet pile is set underwater and is a precast structure; to ensure the overall stability of the revetment structure after dredging and prevent the revetment with only sheet piles from being easily damaged due to no support at the back, a precast ecological planting frame is set between the outside of the precast coping beam and the existing retaining wall.

[0032] Embodiment 2 Based on Embodiment 1, this embodiment discloses a further design of an ecological sheet pile reinforcement structure for an existing retaining wall. Please refer to Figure 2-3 as shown; The precast coping beam 2 is embedded on the concrete sheet pile 1; the precast ecological planting frame 3 is fixed between the precast coping beam 2 and the existing retaining wall 5.

[0033] Furthermore, the number of the concrete sheet piles 1 is several, and the cross-section is in a "ji" shape. Two adjacent concrete sheet piles 1 are connected to each other by a mortise and tenon type tongue-and-groove structure arranged on their sides.

[0034] Furthermore, the number of the precast coping beams 2 is several, and adjacent precast coping beams 2 are butted and connected by a mortise and tenon type tongue-and-groove structure.

[0035] Furthermore, the mortise and tenon type tongue-and-groove structure can be any one of a rabbet joint, a dragon and phoenix tenon, a silver ingot joint, a stepped tenon, a pressing palm tenon, a penetrating tenon, etc.

[0036] Furthermore, in the two opposite long sides of the precast ecological planting frame 3, one long side is provided with a convex part, and the other long side is provided with a concave part that matches the convex part, so that multiple precast ecological planting frames 3 can be spliced and fixed to each other through the fitting of the convex part and the concave part. The convex part and the concave part together form a tongue-and-groove.

[0037] Furthermore, the convex part and the concave part, that is, the tongue-and-groove gap between the spliced precast ecological planting frames 3, are filled with cement mortar, polymer mortar or a rubber water stop strip is installed. The water stop strip needs to be fixed in the groove and is compacted after splicing, so as to improve the anti-seepage property and integrity of the splicing part.

[0038] Furthermore, on one side of the precast ecological planting frame 3, the precast coping beam 2 and the precast ecological planting frame 3 are connected into a whole by grouting, and on the other short side, it is embedded in the hollow groove of the existing retaining wall 5.

[0039] Furthermore, the ecological channels 7 are a plurality of through holes spacedly formed in the concrete sheet piles 1 and corresponding to the position of the filter layer.

[0040] Furthermore, the ecological channels 7 are located in the middle of the concrete sheet piles 1. Since their function is to connect groundwater and river water, they are arranged below the normal water level and the groundwater level, but should not be more than 1 m below the ecological planting frame.

[0041] Furthermore, the plants planted in the precast ecological planting frames 3 are divided into plants in the water upper zone, the water intermediate zone (the land-water ecotone zone), and the water lower zone according to the water level gradient of the growth environment. If plants in the water upper zone need to be planted, the height of the precast coping beam 2 can be set above the design water level C; if plants in the water intermediate zone (the land-water ecotone zone) need to be planted, the height of the precast coping beam 2 can be set at the position flush with the normal water level; if plants in the water lower zone need to be planted, the height of the precast coping beam 2 can be set below the design water level C.

[0042] Furthermore, the filter layer 8 is composed of one of granular materials or geotextiles that are permeable to water and resistant to soil.

[0043] Technical effects of this embodiment: By adopting the "U"-shaped cut-off sheet piles and tenon-mortise type tongue-and-groove joints, the flexural rigidity and overall stability of the sheet pile wall are improved; the ecological planting frames are arranged between the coping beam and the existing retaining wall, integrating the new and old structures into a whole, and enhancing the overall rigidity of the bank reinforcement system.

[0044] Embodiment 3 Based on Embodiment 1 and Embodiment 2, this embodiment introduces a construction method for building an ecological sheet pile reinforcement structure for an existing retaining wall. Please refer to the appendix Figure 4 ; This construction method includes the following steps: S1. Precast the concrete sheet piles 1, the precast coping beam 2, and the precast ecological planting frames 3; S2. On the water-facing side of the existing retaining wall 5, press the concrete sheet piles 1 into the design elevation one by one by static pressure; S3. Fill the space between the concrete sheet piles 1 and the existing retaining wall 5 with backfill soil 6, and lay the filter layer 8 at the position of the ecological channels 7 on the inner side of the concrete sheet piles 1 during the filling process; S4. Embed the precast coping beam 2 on the top of the concrete sheet piles 1; S5. Chisel out an installation groove at the position corresponding to the precast coping beam 2 on the existing retaining wall 5, place the precast ecological planting frame 3 in the groove and fix it on the precast coping beam 2, and then plant aquatic plants 4 in the precast ecological planting frame 3; S6. Carry out underwater dredging of the waterway at the original mud surface line A of the waterway to the designed mud surface B of the waterway.

[0045] Before construction, it is necessary to calculate the dredging depth of the waterway under the required width conditions for safe navigation, and determine the embedment depth and specifications of the precast sheet piles for reinforcement. A stability verification calculation should be performed on the combination of the newly built revetment and the existing structure, and the structural dimensions and models should be adjusted according to the calculation results.

[0046] Furthermore, in step S2, the concrete sheet piles 1 interlock with each other through the tongue and groove structure on the sides to form a continuous sheet pile wall.

[0047] Furthermore, in step S4, adjacent prefabricated cap beams 2 are connected by a mortise and tenon joint structure.

[0048] Furthermore, the specifications and length of the sheet piles are determined based on the geological conditions of the structure and the corresponding stability calculations.

[0049] Furthermore, the size of the precast cap beam is matched with the precast sheet pile, and the size of the precast ecological planting frame is determined according to the magnitude of the ship impact force it can resist.

[0050] Technical advantages of this embodiment: This embodiment provides a construction method for building an ecological sheet pile reinforcement structure for existing retaining walls. It adopts fully prefabricated components and static pressure pile driving technology, with a high degree of on-site assembly, avoiding underwater cast-in-place concrete and the construction of cofferdams, thus reducing the impact on navigation.

[0051] The above description is merely a preferred embodiment of the present invention and does not limit the scope of protection of the present invention. Various modifications and variations are possible with respect to the present invention. Any changes, modifications, substitutions, integrations, and parameter alterations to these embodiments within the spirit and principles of the present invention fall within the scope of protection of the claims of the present invention.

Claims

1. An ecological sheet pile reinforcement structure for existing retaining walls, characterized in that, Comprising: Existing retaining wall (5); Concrete sheet piles (1) arranged in a row along the extension direction of the existing retaining wall (5), and the bottom ends of each concrete sheet pile (1) are lower than the designed mud surface B of the waterway; The precast cap beam (2) is composed of multiple precast cap beam segments spliced together, and a reserved hole matching the shape of the top of the concrete sheet pile (1) is opened at the bottom. The precast cap beam (2) is embedded and fixed on the concrete sheet pile (1); Multiple precast ecological planting frames (3) are fixed on the side of the precast cap beam (2) facing the existing retaining wall (5), and partially embedded in the existing retaining wall (5); Aquatic plants (4) are planted in the precast ecological planting frames (3); Backfill soil (6) is filled in the space formed by the concrete sheet piles (1), the existing retaining wall (5) and the precast ecological planting frames (3); The ecological channel (7) is a through hole penetrating the pile body of the concrete sheet pile (1) and is used to connect the backfill soil (6) area and the waterway water area; The filter layer (8) is laid between the backfill soil (6) and the concrete sheet pile (1) and covers the opening on the soil side of the ecological channel (7).

2. The ecological sheet pile reinforcement structure for existing retaining walls according to claim 1, characterized in that, The number of the concrete sheet piles (1) is several, and the cross section is "Z" - shaped. Adjacent two concrete sheet piles (1) are mutually engaged and connected through a mortise - tenon type socket structure arranged on their sides.

3. The ecological sheet pile reinforcement structure for existing retaining walls according to claim 1, characterized in that, The number of the precast cap beams is several, and adjacent precast cap beams are butt - jointed through a mortise - tenon type socket structure.

4. The ecological sheet pile reinforcement structure for existing retaining walls according to claim 1, characterized in that, Among the two opposite long sides of the precast ecological planting frame (3), one long side is provided with a convex part, and the other long side is provided with a concave part matching the convex part, so that multiple precast ecological planting frames (3) can be mutually spliced and fixed through the fit of the convex part and the concave part. The convex part and the concave part together form a socket.

5. An ecological sheet pile reinforcement structure for existing retaining walls according to claim 4, characterized in that, In the socket gap, that is, between the convex part and the concave part of the mutually spliced precast ecological planting frames (3), cement mortar, polymer mortar or a rubber water stop strip is filled. The water stop strip needs to be fixed in the groove and is compacted after splicing, which is used to improve the anti - seepage property and integrity of the splicing part.

6. An ecological sheet pile reinforcement structure for existing retaining walls according to claim 5, characterized in that, One side of the precast ecological planting frame (3) is connected to the precast cap beam (2) by grouting to form an integral body, and the other side is embedded in the hollow groove of the existing retaining wall (5).

7. The ecological sheet pile reinforcement structure for existing retaining walls according to claim 1, characterized in that, The ecological channel (7) is multiple through holes opened at intervals on the concrete sheet pile (1) corresponding to the position of the filter layer.

8. An ecological sheet pile reinforcement structure for existing retaining walls according to claim 1, characterized in that, The filter layer (8) is composed of one of pervious and soil - resistant granular materials or geotextiles.

9. A construction method for constructing an ecological sheet pile reinforcement structure for an existing retaining wall as described in any one of claims 1-8, characterized in that, Including the following steps: S1. Precast concrete sheet piles (1), precast cap beams (2) and precast ecological planting frames (3); S2. On the water - facing side of the existing retaining wall (5), press each concrete sheet pile (1) statically to the designed elevation; S3. Fill the space between the concrete sheet pile (1) and the existing retaining wall (5) with backfill soil (6) and lay the filter layer (8); S4. Embed and fix the precast cap beam (2) on the top of the concrete sheet pile (1); S5. On the existing retaining wall (5), a groove is chiseled out at the position corresponding to the precast cap beam (2). The precast ecological planting frame (3) is placed in the groove and fixed on the precast cap beam (2). Then, aquatic plants (4) are planted in the precast ecological planting frame (3). S6. Conduct underwater dredging of the waterway.

10. A construction method for an ecological sheet pile reinforcement structure for existing retaining walls according to claim 9, characterized in that, In step S2, the concrete sheet piles (1) interlock with each other through the tongue and groove structure on the side to form a continuous sheet pile wall; in step S4, the adjacent precast cap beams (2) are connected by a tenon and mortise joint structure.

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